shithub: libvpx

diff: cannot open b/third_party/libwebm/common//null: file does not exist: 'b/third_party/libwebm/common//null' diff: cannot open b/third_party/libwebm/mkvmuxer//null: file does not exist: 'b/third_party/libwebm/mkvmuxer//null' diff: cannot open b/third_party/libwebm/mkvparser//null: file does not exist: 'b/third_party/libwebm/mkvparser//null'

--- a/examples.mk

+++ b/examples.mk

@@ -36,22 +36,31 @@

                 third_party/libyuv/source/scale_neon64.cc \

                 third_party/libyuv/source/scale_win.cc \

-LIBWEBM_COMMON_SRCS += third_party/libwebm/webmids.hpp

+LIBWEBM_COMMON_SRCS += third_party/libwebm/common/hdr_util.cc \

+                       third_party/libwebm/common/hdr_util.h \

+                       third_party/libwebm/common/webmids.h

-LIBWEBM_MUXER_SRCS += third_party/libwebm/mkvmuxer.cpp \

-                      third_party/libwebm/mkvmuxerutil.cpp \

-                      third_party/libwebm/mkvwriter.cpp \

-                      third_party/libwebm/mkvmuxer.hpp \

-                      third_party/libwebm/mkvmuxertypes.hpp \

-                      third_party/libwebm/mkvmuxerutil.hpp \

-                      third_party/libwebm/mkvparser.hpp \

-                      third_party/libwebm/mkvwriter.hpp

+LIBWEBM_MUXER_SRCS += third_party/libwebm/mkvmuxer/mkvmuxer.cc \

+                      third_party/libwebm/mkvmuxer/mkvmuxerutil.cc \

+                      third_party/libwebm/mkvmuxer/mkvwriter.cc \

+                      third_party/libwebm/mkvmuxer/mkvmuxer.h \

+                      third_party/libwebm/mkvmuxer/mkvmuxertypes.h \

+                      third_party/libwebm/mkvmuxer/mkvmuxerutil.h \

+                      third_party/libwebm/mkvparser/mkvparser.h \

+                      third_party/libwebm/mkvmuxer/mkvwriter.h

-LIBWEBM_PARSER_SRCS = third_party/libwebm/mkvparser.cpp \

-                      third_party/libwebm/mkvreader.cpp \

-                      third_party/libwebm/mkvparser.hpp \

-                      third_party/libwebm/mkvreader.hpp

+LIBWEBM_PARSER_SRCS = third_party/libwebm/mkvparser/mkvparser.cc \

+                      third_party/libwebm/mkvparser/mkvreader.cc \

+                      third_party/libwebm/mkvparser/mkvparser.h \

+                      third_party/libwebm/mkvparser/mkvreader.h

+# Add compile flags and include path for libwebm sources.

+ifeq ($(CONFIG_WEBM_IO),yes)

+  CXXFLAGS     += -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS

+  INC_PATH-yes += $(SRC_PATH_BARE)/third_party/libwebm

+endif

 # List of examples to build. UTILS are tools meant for distribution

 # while EXAMPLES demonstrate specific portions of the API.

 UTILS-$(CONFIG_DECODERS)    += vpxdec.c

@@ -70,6 +79,7 @@

 endif

 ifeq ($(CONFIG_WEBM_IO),yes)

   vpxdec.SRCS                 += $(LIBWEBM_COMMON_SRCS)

+  vpxdec.SRCS                 += $(LIBWEBM_MUXER_SRCS)

   vpxdec.SRCS                 += $(LIBWEBM_PARSER_SRCS)

   vpxdec.SRCS                 += webmdec.cc webmdec.h

 endif

@@ -93,6 +103,7 @@

 ifeq ($(CONFIG_WEBM_IO),yes)

   vpxenc.SRCS                 += $(LIBWEBM_COMMON_SRCS)

   vpxenc.SRCS                 += $(LIBWEBM_MUXER_SRCS)

+  vpxenc.SRCS                 += $(LIBWEBM_PARSER_SRCS)

   vpxenc.SRCS                 += webmenc.cc webmenc.h

 endif

 vpxenc.GUID                  = 548DEC74-7A15-4B2B-AFC3-AA102E7C25C1

--- a/libs.mk

+++ b/libs.mk

@@ -394,6 +394,12 @@

 $(shell $(SRC_PATH_BARE)/build/make/version.sh "$(SRC_PATH_BARE)" $(BUILD_PFX)vpx_version.h)

 CLEAN-OBJS += $(BUILD_PFX)vpx_version.h

+#

+# Add include path for libwebm sources.

+#

+ifeq ($(CONFIG_WEBM_IO),yes)

+  CXXFLAGS += -I$(SRC_PATH_BARE)/third_party/libwebm

+endif

##

 ## libvpx test directives

@@ -469,6 +475,7 @@

             $(if $(CONFIG_STATIC_MSVCRT),--static-crt) \

             --out=$@ $(INTERNAL_CFLAGS) $(CFLAGS) \

             -I. -I"$(SRC_PATH_BARE)/third_party/googletest/src/include" \

+            $(if $(CONFIG_WEBM_IO),-I"$(SRC_PATH_BARE)/third_party/libwebm") \

             -L. -l$(CODEC_LIB) -l$(GTEST_LIB) $^

 PROJECTS-$(CONFIG_MSVS) += test_libvpx.$(VCPROJ_SFX)

--- a/test/test.mk

+++ b/test/test.mk

@@ -59,10 +59,10 @@

 ## WebM Parsing

 ifeq ($(CONFIG_WEBM_IO), yes)

-LIBWEBM_PARSER_SRCS                    += ../third_party/libwebm/mkvparser.cpp

-LIBWEBM_PARSER_SRCS                    += ../third_party/libwebm/mkvreader.cpp

-LIBWEBM_PARSER_SRCS                    += ../third_party/libwebm/mkvparser.hpp

-LIBWEBM_PARSER_SRCS                    += ../third_party/libwebm/mkvreader.hpp

+LIBWEBM_PARSER_SRCS += ../third_party/libwebm/mkvparser/mkvparser.cc

+LIBWEBM_PARSER_SRCS += ../third_party/libwebm/mkvparser/mkvreader.cc

+LIBWEBM_PARSER_SRCS += ../third_party/libwebm/mkvparser/mkvparser.h

+LIBWEBM_PARSER_SRCS += ../third_party/libwebm/mkvparser/mkvreader.h

 LIBVPX_TEST_SRCS-$(CONFIG_DECODERS)    += $(LIBWEBM_PARSER_SRCS)

 LIBVPX_TEST_SRCS-$(CONFIG_DECODERS)    += ../tools_common.h

 LIBVPX_TEST_SRCS-$(CONFIG_DECODERS)    += ../webmdec.cc

--- a/third_party/libwebm/Android.mk

+++ b/third_party/libwebm/Android.mk

@@ -2,9 +2,16 @@

 include $(CLEAR_VARS)

 LOCAL_MODULE:= libwebm

-LOCAL_SRC_FILES:= mkvparser.cpp \

-                  mkvreader.cpp \

-                  mkvmuxer.cpp \

-                  mkvmuxerutil.cpp \

-                  mkvwriter.cpp

+LOCAL_CPPFLAGS:=-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS

+LOCAL_CPPFLAGS+=-D__STDC_LIMIT_MACROS

+LOCAL_C_INCLUDES:= $(LOCAL_PATH)

+LOCAL_EXPORT_C_INCLUDES:= $(LOCAL_PATH)

+LOCAL_SRC_FILES:= common/file_util.cc \

+                  common/hdr_util.cc \

+                  mkvparser/mkvparser.cc \

+                  mkvparser/mkvreader.cc \

+                  mkvmuxer/mkvmuxer.cc \

+                  mkvmuxer/mkvmuxerutil.cc \

+                  mkvmuxer/mkvwriter.cc

 include $(BUILD_STATIC_LIBRARY)

--- a/third_party/libwebm/README.libvpx

+++ b/third_party/libwebm/README.libvpx

@@ -1,5 +1,5 @@

 URL: https://chromium.googlesource.com/webm/libwebm

-Version: 476366249e1fda7710a389cd41c57db42305e0d4

+Version: 5c50e310e7050192b952fe588186fd1dadc08b6e

 License: BSD

 License File: LICENSE.txt

@@ -7,4 +7,4 @@

 libwebm is used to handle WebM container I/O.

 Local Changes:

-* <none>

+* Android.mk modified to build Libwebm for Android within Libvpx.

--- a/third_party/libwebm/RELEASE.TXT

+++ /dev/null

@@ -1,34 +1,0 @@

-1.0.0.5

- * Handled case when no duration

- * Handled empty clusters

- * Handled empty clusters when seeking

- * Implemented check lacing bits

-1.0.0.4

- * Made Cues member variables mutables

- * Defined against badly-formatted cue points

- * Segment::GetCluster returns CuePoint too

- * Separated cue-based searches

-1.0.0.3

- * Added Block::GetOffset() to get a frame's offset in a block

- * Changed cluster count type from size_t to long

- * Parsed SeekHead to find cues

- * Allowed seeking beyond end of cluster cache

- * Added not to attempt to reparse cues element

- * Restructured Segment::LoadCluster

- * Marked position of cues without parsing cues element

- * Allowed cue points to be loaded incrementally

- * Implemented to load lazily cue points as they're searched

- * Merged Cues::LoadCuePoint into Cues::Find

- * Lazy init cues

- * Loaded cue point during find

-1.0.0.2

- * added support for Cues element

- * seeking was improved

-1.0.0.1

- * fixed item 141

- * added item 142

- * added this file, RELEASE.TXT, to repository

--- /dev/null

+++ b/third_party/libwebm/common/file_util.cc

@@ -1,0 +1,67 @@

+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "common/file_util.h"

+#include <sys/stat.h>

+#ifndef _MSC_VER

+#include <unistd.h>  // close()

+#endif

+#include <cstdio>

+#include <cstdlib>

+#include <fstream>

+#include <ios>

+namespace libwebm {

+std::string GetTempFileName() {

+#if !defined _MSC_VER && !defined __MINGW32__

+  char temp_file_name_template[] = "libwebm_temp.XXXXXX";

+  int fd = mkstemp(temp_file_name_template);

+  if (fd != -1) {

+    close(fd);

+    return std::string(temp_file_name_template);

+  }

+  return std::string();

+#else

+  char tmp_file_name[_MAX_PATH];

+  errno_t err = tmpnam_s(tmp_file_name);

+  if (err == 0) {

+    return std::string(tmp_file_name);

+  }

+  return std::string();

+#endif

+}

+uint64_t GetFileSize(const std::string& file_name) {

+  uint64_t file_size = 0;

+#ifndef _MSC_VER

+  struct stat st;

+  st.st_size = 0;

+  if (stat(file_name.c_str(), &st) == 0) {

+#else

+  struct _stat st;

+  st.st_size = 0;

+  if (_stat(file_name.c_str(), &st) == 0) {

+#endif

+    file_size = st.st_size;

+  }

+  return file_size;

+}

+TempFileDeleter::TempFileDeleter() { file_name_ = GetTempFileName(); }

+TempFileDeleter::~TempFileDeleter() {

+  std::ifstream file(file_name_.c_str());

+  if (file.good()) {

+    file.close();

+    std::remove(file_name_.c_str());

+  }

+}

+}  // namespace libwebm

--- /dev/null

+++ b/third_party/libwebm/common/file_util.h

@@ -1,0 +1,41 @@

+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef LIBWEBM_COMMON_FILE_UTIL_H_

+#define LIBWEBM_COMMON_FILE_UTIL_H_

+#include <stdint.h>

+#include <string>

+#include "mkvmuxer/mkvmuxertypes.h"  // LIBWEBM_DISALLOW_COPY_AND_ASSIGN()

+namespace libwebm {

+// Returns a temporary file name.

+std::string GetTempFileName();

+// Returns size of file specified by |file_name|, or 0 upon failure.

+uint64_t GetFileSize(const std::string& file_name);

+// Manages life of temporary file specified at time of construction. Deletes

+// file upon destruction.

+class TempFileDeleter {

+ public:

+  TempFileDeleter();

+  explicit TempFileDeleter(std::string file_name) : file_name_(file_name) {}

+  ~TempFileDeleter();

+  const std::string& name() const { return file_name_; }

+ private:

+  std::string file_name_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(TempFileDeleter);

+};

+}  // namespace libwebm

+#endif  // LIBWEBM_COMMON_FILE_UTIL_H_

\ No newline at end of file

--- /dev/null

+++ b/third_party/libwebm/common/hdr_util.cc

@@ -1,0 +1,182 @@

+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "hdr_util.h"

+#include <cstddef>

+#include <new>

+#include "mkvparser/mkvparser.h"

+namespace libwebm {

+bool CopyPrimaryChromaticity(const mkvparser::PrimaryChromaticity& parser_pc,

+                             PrimaryChromaticityPtr* muxer_pc) {

+  muxer_pc->reset(new (std::nothrow)

+                      mkvmuxer::PrimaryChromaticity(parser_pc.x, parser_pc.y));

+  if (!muxer_pc->get())

+    return false;

+  return true;

+}

+bool MasteringMetadataValuePresent(double value) {

+  return value != mkvparser::MasteringMetadata::kValueNotPresent;

+}

+bool CopyMasteringMetadata(const mkvparser::MasteringMetadata& parser_mm,

+                           mkvmuxer::MasteringMetadata* muxer_mm) {

+  if (MasteringMetadataValuePresent(parser_mm.luminance_max))

+    muxer_mm->luminance_max = parser_mm.luminance_max;

+  if (MasteringMetadataValuePresent(parser_mm.luminance_min))

+    muxer_mm->luminance_min = parser_mm.luminance_min;

+  PrimaryChromaticityPtr r_ptr(NULL);

+  PrimaryChromaticityPtr g_ptr(NULL);

+  PrimaryChromaticityPtr b_ptr(NULL);

+  PrimaryChromaticityPtr wp_ptr(NULL);

+  if (parser_mm.r) {

+    if (!CopyPrimaryChromaticity(*parser_mm.r, &r_ptr))

+      return false;

+  }

+  if (parser_mm.g) {

+    if (!CopyPrimaryChromaticity(*parser_mm.g, &g_ptr))

+      return false;

+  }

+  if (parser_mm.b) {

+    if (!CopyPrimaryChromaticity(*parser_mm.b, &b_ptr))

+      return false;

+  }

+  if (parser_mm.white_point) {

+    if (!CopyPrimaryChromaticity(*parser_mm.white_point, &wp_ptr))

+      return false;

+  }

+  if (!muxer_mm->SetChromaticity(r_ptr.get(), g_ptr.get(), b_ptr.get(),

+                                 wp_ptr.get())) {

+    return false;

+  }

+  return true;

+}

+bool ColourValuePresent(long long value) {

+  return value != mkvparser::Colour::kValueNotPresent;

+}

+bool CopyColour(const mkvparser::Colour& parser_colour,

+                mkvmuxer::Colour* muxer_colour) {

+  if (!muxer_colour)

+    return false;

+  if (ColourValuePresent(parser_colour.matrix_coefficients))

+    muxer_colour->matrix_coefficients = parser_colour.matrix_coefficients;

+  if (ColourValuePresent(parser_colour.bits_per_channel))

+    muxer_colour->bits_per_channel = parser_colour.bits_per_channel;

+  if (ColourValuePresent(parser_colour.chroma_subsampling_horz))

+    muxer_colour->chroma_subsampling_horz =

+        parser_colour.chroma_subsampling_horz;

+  if (ColourValuePresent(parser_colour.chroma_subsampling_vert))

+    muxer_colour->chroma_subsampling_vert =

+        parser_colour.chroma_subsampling_vert;

+  if (ColourValuePresent(parser_colour.cb_subsampling_horz))

+    muxer_colour->cb_subsampling_horz = parser_colour.cb_subsampling_horz;

+  if (ColourValuePresent(parser_colour.cb_subsampling_vert))

+    muxer_colour->cb_subsampling_vert = parser_colour.cb_subsampling_vert;

+  if (ColourValuePresent(parser_colour.chroma_siting_horz))

+    muxer_colour->chroma_siting_horz = parser_colour.chroma_siting_horz;

+  if (ColourValuePresent(parser_colour.chroma_siting_vert))

+    muxer_colour->chroma_siting_vert = parser_colour.chroma_siting_vert;

+  if (ColourValuePresent(parser_colour.range))

+    muxer_colour->range = parser_colour.range;

+  if (ColourValuePresent(parser_colour.transfer_characteristics))

+    muxer_colour->transfer_characteristics =

+        parser_colour.transfer_characteristics;

+  if (ColourValuePresent(parser_colour.primaries))

+    muxer_colour->primaries = parser_colour.primaries;

+  if (ColourValuePresent(parser_colour.max_cll))

+    muxer_colour->max_cll = parser_colour.max_cll;

+  if (ColourValuePresent(parser_colour.max_fall))

+    muxer_colour->max_fall = parser_colour.max_fall;

+  if (parser_colour.mastering_metadata) {

+    mkvmuxer::MasteringMetadata muxer_mm;

+    if (!CopyMasteringMetadata(*parser_colour.mastering_metadata, &muxer_mm))

+      return false;

+    if (!muxer_colour->SetMasteringMetadata(muxer_mm))

+      return false;

+  }

+  return true;

+}

+// Format of VPx private data:

+//

+//   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+//  |    ID Byte    |             Length            |               |

+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+               |

+//  |                                                               |

+//  :               Bytes 1..Length of Codec Feature                :

+//  |                                                               |

+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+//

+// ID Byte Format

+// ID byte is an unsigned byte.

+//   0 1 2 3 4 5 6 7

+//  +-+-+-+-+-+-+-+-+

+//  |X|    ID       |

+//  +-+-+-+-+-+-+-+-+

+//

+// The X bit is reserved.

+//

+// Currently only profile level is supported. ID byte must be set to 1, and

+// length must be 1. Supported values are:

+//

+//   10: Level 1

+//   11: Level 1.1

+//   20: Level 2

+//   21: Level 2.1

+//   30: Level 3

+//   31: Level 3.1

+//   40: Level 4

+//   41: Level 4.1

+//   50: Level 5

+//   51: Level 5.1

+//   52: Level 5.2

+//   60: Level 6

+//   61: Level 6.1

+//   62: Level 6.2

+//

+// See the following link for more information:

+// http://www.webmproject.org/vp9/profiles/

+int ParseVpxCodecPrivate(const uint8_t* private_data, int32_t length) {

+  const int kVpxCodecPrivateLength = 3;

+  if (!private_data || length != kVpxCodecPrivateLength)

+    return 0;

+  const uint8_t id_byte = *private_data;

+  if (id_byte != 1)

+    return 0;

+  const int kVpxProfileLength = 1;

+  const uint8_t length_byte = private_data[1];

+  if (length_byte != kVpxProfileLength)

+    return 0;

+  const int level = static_cast<int>(private_data[2]);

+  const int kNumLevels = 14;

+  const int levels[kNumLevels] = {10, 11, 20, 21, 30, 31, 40,

+                                  41, 50, 51, 52, 60, 61, 62};

+  for (int i = 0; i < kNumLevels; ++i) {

+    if (level == levels[i])

+      return level;

+  }

+  return 0;

+}

+}  // namespace libwebm

--- /dev/null

+++ b/third_party/libwebm/common/hdr_util.h

@@ -1,0 +1,51 @@

+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef LIBWEBM_COMMON_HDR_UTIL_H_

+#define LIBWEBM_COMMON_HDR_UTIL_H_

+#include <stdint.h>

+#include <memory>

+#include "mkvmuxer/mkvmuxer.h"

+namespace mkvparser {

+struct Colour;

+struct MasteringMetadata;

+struct PrimaryChromaticity;

+}  // namespace mkvparser

+namespace libwebm {

+// Utility types and functions for working with the Colour element and its

+// children. Copiers return true upon success. Presence functions return true

+// when the specified element is present.

+// TODO(tomfinegan): These should be moved to libwebm_utils once c++11 is

+// required by libwebm.

+typedef std::auto_ptr<mkvmuxer::PrimaryChromaticity> PrimaryChromaticityPtr;

+bool CopyPrimaryChromaticity(const mkvparser::PrimaryChromaticity& parser_pc,

+                             PrimaryChromaticityPtr* muxer_pc);

+bool MasteringMetadataValuePresent(double value);

+bool CopyMasteringMetadata(const mkvparser::MasteringMetadata& parser_mm,

+                           mkvmuxer::MasteringMetadata* muxer_mm);

+bool ColourValuePresent(long long value);

+bool CopyColour(const mkvparser::Colour& parser_colour,

+                mkvmuxer::Colour* muxer_colour);

+// Returns VP9 profile upon success or 0 upon failure.

+int ParseVpxCodecPrivate(const uint8_t* private_data, int32_t length);

+}  // namespace libwebm

+#endif  // LIBWEBM_COMMON_HDR_UTIL_H_

--- /dev/null

+++ b/third_party/libwebm/common/webmids.h

@@ -1,0 +1,184 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef COMMON_WEBMIDS_H_

+#define COMMON_WEBMIDS_H_

+namespace libwebm {

+enum MkvId {

+  kMkvEBML = 0x1A45DFA3,

+  kMkvEBMLVersion = 0x4286,

+  kMkvEBMLReadVersion = 0x42F7,

+  kMkvEBMLMaxIDLength = 0x42F2,

+  kMkvEBMLMaxSizeLength = 0x42F3,

+  kMkvDocType = 0x4282,

+  kMkvDocTypeVersion = 0x4287,

+  kMkvDocTypeReadVersion = 0x4285,

+  kMkvVoid = 0xEC,

+  kMkvSignatureSlot = 0x1B538667,

+  kMkvSignatureAlgo = 0x7E8A,

+  kMkvSignatureHash = 0x7E9A,

+  kMkvSignaturePublicKey = 0x7EA5,

+  kMkvSignature = 0x7EB5,

+  kMkvSignatureElements = 0x7E5B,

+  kMkvSignatureElementList = 0x7E7B,

+  kMkvSignedElement = 0x6532,

+  // segment

+  kMkvSegment = 0x18538067,

+  // Meta Seek Information

+  kMkvSeekHead = 0x114D9B74,

+  kMkvSeek = 0x4DBB,

+  kMkvSeekID = 0x53AB,

+  kMkvSeekPosition = 0x53AC,

+  // Segment Information

+  kMkvInfo = 0x1549A966,

+  kMkvTimecodeScale = 0x2AD7B1,

+  kMkvDuration = 0x4489,

+  kMkvDateUTC = 0x4461,

+  kMkvTitle = 0x7BA9,

+  kMkvMuxingApp = 0x4D80,

+  kMkvWritingApp = 0x5741,

+  // Cluster

+  kMkvCluster = 0x1F43B675,

+  kMkvTimecode = 0xE7,

+  kMkvPrevSize = 0xAB,

+  kMkvBlockGroup = 0xA0,

+  kMkvBlock = 0xA1,

+  kMkvBlockDuration = 0x9B,

+  kMkvReferenceBlock = 0xFB,

+  kMkvLaceNumber = 0xCC,

+  kMkvSimpleBlock = 0xA3,

+  kMkvBlockAdditions = 0x75A1,

+  kMkvBlockMore = 0xA6,

+  kMkvBlockAddID = 0xEE,

+  kMkvBlockAdditional = 0xA5,

+  kMkvDiscardPadding = 0x75A2,

+  // Track

+  kMkvTracks = 0x1654AE6B,

+  kMkvTrackEntry = 0xAE,

+  kMkvTrackNumber = 0xD7,

+  kMkvTrackUID = 0x73C5,

+  kMkvTrackType = 0x83,

+  kMkvFlagEnabled = 0xB9,

+  kMkvFlagDefault = 0x88,

+  kMkvFlagForced = 0x55AA,

+  kMkvFlagLacing = 0x9C,

+  kMkvDefaultDuration = 0x23E383,

+  kMkvMaxBlockAdditionID = 0x55EE,

+  kMkvName = 0x536E,

+  kMkvLanguage = 0x22B59C,

+  kMkvCodecID = 0x86,

+  kMkvCodecPrivate = 0x63A2,

+  kMkvCodecName = 0x258688,

+  kMkvCodecDelay = 0x56AA,

+  kMkvSeekPreRoll = 0x56BB,

+  // video

+  kMkvVideo = 0xE0,

+  kMkvFlagInterlaced = 0x9A,

+  kMkvStereoMode = 0x53B8,

+  kMkvAlphaMode = 0x53C0,

+  kMkvPixelWidth = 0xB0,

+  kMkvPixelHeight = 0xBA,

+  kMkvPixelCropBottom = 0x54AA,

+  kMkvPixelCropTop = 0x54BB,

+  kMkvPixelCropLeft = 0x54CC,

+  kMkvPixelCropRight = 0x54DD,

+  kMkvDisplayWidth = 0x54B0,

+  kMkvDisplayHeight = 0x54BA,

+  kMkvDisplayUnit = 0x54B2,

+  kMkvAspectRatioType = 0x54B3,

+  kMkvFrameRate = 0x2383E3,

+  // end video

+  // colour

+  kMkvColour = 0x55B0,

+  kMkvMatrixCoefficients = 0x55B1,

+  kMkvBitsPerChannel = 0x55B2,

+  kMkvChromaSubsamplingHorz = 0x55B3,

+  kMkvChromaSubsamplingVert = 0x55B4,

+  kMkvCbSubsamplingHorz = 0x55B5,

+  kMkvCbSubsamplingVert = 0x55B6,

+  kMkvChromaSitingHorz = 0x55B7,

+  kMkvChromaSitingVert = 0x55B8,

+  kMkvRange = 0x55B9,

+  kMkvTransferCharacteristics = 0x55BA,

+  kMkvPrimaries = 0x55BB,

+  kMkvMaxCLL = 0x55BC,

+  kMkvMaxFALL = 0x55BD,

+  // mastering metadata

+  kMkvMasteringMetadata = 0x55D0,

+  kMkvPrimaryRChromaticityX = 0x55D1,

+  kMkvPrimaryRChromaticityY = 0x55D2,

+  kMkvPrimaryGChromaticityX = 0x55D3,

+  kMkvPrimaryGChromaticityY = 0x55D4,

+  kMkvPrimaryBChromaticityX = 0x55D5,

+  kMkvPrimaryBChromaticityY = 0x55D6,

+  kMkvWhitePointChromaticityX = 0x55D7,

+  kMkvWhitePointChromaticityY = 0x55D8,

+  kMkvLuminanceMax = 0x55D9,

+  kMkvLuminanceMin = 0x55DA,

+  // end mastering metadata

+  // end colour

+  // audio

+  kMkvAudio = 0xE1,

+  kMkvSamplingFrequency = 0xB5,

+  kMkvOutputSamplingFrequency = 0x78B5,

+  kMkvChannels = 0x9F,

+  kMkvBitDepth = 0x6264,

+  // end audio

+  // ContentEncodings

+  kMkvContentEncodings = 0x6D80,

+  kMkvContentEncoding = 0x6240,

+  kMkvContentEncodingOrder = 0x5031,

+  kMkvContentEncodingScope = 0x5032,

+  kMkvContentEncodingType = 0x5033,

+  kMkvContentCompression = 0x5034,

+  kMkvContentCompAlgo = 0x4254,

+  kMkvContentCompSettings = 0x4255,

+  kMkvContentEncryption = 0x5035,

+  kMkvContentEncAlgo = 0x47E1,

+  kMkvContentEncKeyID = 0x47E2,

+  kMkvContentSignature = 0x47E3,

+  kMkvContentSigKeyID = 0x47E4,

+  kMkvContentSigAlgo = 0x47E5,

+  kMkvContentSigHashAlgo = 0x47E6,

+  kMkvContentEncAESSettings = 0x47E7,

+  kMkvAESSettingsCipherMode = 0x47E8,

+  kMkvAESSettingsCipherInitData = 0x47E9,

+  // end ContentEncodings

+  // Cueing Data

+  kMkvCues = 0x1C53BB6B,

+  kMkvCuePoint = 0xBB,

+  kMkvCueTime = 0xB3,

+  kMkvCueTrackPositions = 0xB7,

+  kMkvCueTrack = 0xF7,

+  kMkvCueClusterPosition = 0xF1,

+  kMkvCueBlockNumber = 0x5378,

+  // Chapters

+  kMkvChapters = 0x1043A770,

+  kMkvEditionEntry = 0x45B9,

+  kMkvChapterAtom = 0xB6,

+  kMkvChapterUID = 0x73C4,

+  kMkvChapterStringUID = 0x5654,

+  kMkvChapterTimeStart = 0x91,

+  kMkvChapterTimeEnd = 0x92,

+  kMkvChapterDisplay = 0x80,

+  kMkvChapString = 0x85,

+  kMkvChapLanguage = 0x437C,

+  kMkvChapCountry = 0x437E,

+  // Tags

+  kMkvTags = 0x1254C367,

+  kMkvTag = 0x7373,

+  kMkvSimpleTag = 0x67C8,

+  kMkvTagName = 0x45A3,

+  kMkvTagString = 0x4487

+};

+}  // namespace libwebm

+#endif  // COMMON_WEBMIDS_H_

--- a/third_party/libwebm/mkvmuxer.cpp

+++ /dev/null

@@ -1,3277 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#include "mkvmuxer.hpp"

-#include <climits>

-#include <cstdio>

-#include <cstdlib>

-#include <cstring>

-#include <ctime>

-#include <new>

-#include "mkvmuxerutil.hpp"

-#include "mkvparser.hpp"

-#include "mkvwriter.hpp"

-#include "webmids.hpp"

-#ifdef _MSC_VER

-// Disable MSVC warnings that suggest making code non-portable.

-#pragma warning(disable : 4996)

-#endif

-namespace mkvmuxer {

-namespace {

-// Deallocate the string designated by |dst|, and then copy the |src|

-// string to |dst|.  The caller owns both the |src| string and the

-// |dst| copy (hence the caller is responsible for eventually

-// deallocating the strings, either directly, or indirectly via

-// StrCpy).  Returns true if the source string was successfully copied

-// to the destination.

-bool StrCpy(const char* src, char** dst_ptr) {

-  if (dst_ptr == NULL)

-    return false;

-  char*& dst = *dst_ptr;

-  delete[] dst;

-  dst = NULL;

-  if (src == NULL)

-    return true;

-  const size_t size = strlen(src) + 1;

-  dst = new (std::nothrow) char[size];  // NOLINT

-  if (dst == NULL)

-    return false;

-  strcpy(dst, src);  // NOLINT

-  return true;

-}

-}  // namespace

-///////////////////////////////////////////////////////////////

-//

-// IMkvWriter Class

-IMkvWriter::IMkvWriter() {}

-IMkvWriter::~IMkvWriter() {}

-bool WriteEbmlHeader(IMkvWriter* writer, uint64 doc_type_version) {

-  // Level 0

-  uint64 size = EbmlElementSize(kMkvEBMLVersion, 1ULL);

-  size += EbmlElementSize(kMkvEBMLReadVersion, 1ULL);

-  size += EbmlElementSize(kMkvEBMLMaxIDLength, 4ULL);

-  size += EbmlElementSize(kMkvEBMLMaxSizeLength, 8ULL);

-  size += EbmlElementSize(kMkvDocType, "webm");

-  size += EbmlElementSize(kMkvDocTypeVersion, doc_type_version);

-  size += EbmlElementSize(kMkvDocTypeReadVersion, 2ULL);

-  if (!WriteEbmlMasterElement(writer, kMkvEBML, size))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvEBMLVersion, 1ULL))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvEBMLReadVersion, 1ULL))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvEBMLMaxIDLength, 4ULL))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvEBMLMaxSizeLength, 8ULL))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvDocType, "webm"))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvDocTypeVersion, doc_type_version))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvDocTypeReadVersion, 2ULL))

-    return false;

-  return true;

-}

-bool WriteEbmlHeader(IMkvWriter* writer) {

-  return WriteEbmlHeader(writer, mkvmuxer::Segment::kDefaultDocTypeVersion);

-}

-bool ChunkedCopy(mkvparser::IMkvReader* source, mkvmuxer::IMkvWriter* dst,

-                 mkvmuxer::int64 start, int64 size) {

-  // TODO(vigneshv): Check if this is a reasonable value.

-  const uint32 kBufSize = 2048;

-  uint8* buf = new uint8[kBufSize];

-  int64 offset = start;

-  while (size > 0) {

-    const int64 read_len = (size > kBufSize) ? kBufSize : size;

-    if (source->Read(offset, static_cast<long>(read_len), buf))

-      return false;

-    dst->Write(buf, static_cast<uint32>(read_len));

-    offset += read_len;

-    size -= read_len;

-  }

-  delete[] buf;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// Frame Class

-Frame::Frame()

-    : add_id_(0),

-      additional_(NULL),

-      additional_length_(0),

-      duration_(0),

-      frame_(NULL),

-      is_key_(false),

-      length_(0),

-      track_number_(0),

-      timestamp_(0),

-      discard_padding_(0),

-      reference_block_timestamp_(0),

-      reference_block_timestamp_set_(false) {}

-Frame::~Frame() {

-  delete[] frame_;

-  delete[] additional_;

-}

-bool Frame::CopyFrom(const Frame& frame) {

-  delete[] frame_;

-  frame_ = NULL;

-  length_ = 0;

-  if (frame.length() > 0 && frame.frame() != NULL &&

-      !Init(frame.frame(), frame.length())) {

-    return false;

-  }

-  add_id_ = 0;

-  delete[] additional_;

-  additional_ = NULL;

-  additional_length_ = 0;

-  if (frame.additional_length() > 0 && frame.additional() != NULL &&

-      !AddAdditionalData(frame.additional(), frame.additional_length(),

-                         frame.add_id())) {

-    return false;

-  }

-  duration_ = frame.duration();

-  is_key_ = frame.is_key();

-  track_number_ = frame.track_number();

-  timestamp_ = frame.timestamp();

-  discard_padding_ = frame.discard_padding();

-  return true;

-}

-bool Frame::Init(const uint8* frame, uint64 length) {

-  uint8* const data =

-      new (std::nothrow) uint8[static_cast<size_t>(length)];  // NOLINT

-  if (!data)

-    return false;

-  delete[] frame_;

-  frame_ = data;

-  length_ = length;

-  memcpy(frame_, frame, static_cast<size_t>(length_));

-  return true;

-}

-bool Frame::AddAdditionalData(const uint8* additional, uint64 length,

-                              uint64 add_id) {

-  uint8* const data =

-      new (std::nothrow) uint8[static_cast<size_t>(length)];  // NOLINT

-  if (!data)

-    return false;

-  delete[] additional_;

-  additional_ = data;

-  additional_length_ = length;

-  add_id_ = add_id;

-  memcpy(additional_, additional, static_cast<size_t>(additional_length_));

-  return true;

-}

-bool Frame::IsValid() const {

-  if (length_ == 0 || !frame_) {

-    return false;

-  }

-  if ((additional_length_ != 0 && !additional_) ||

-      (additional_ != NULL && additional_length_ == 0)) {

-    return false;

-  }

-  if (track_number_ == 0 || track_number_ > kMaxTrackNumber) {

-    return false;

-  }

-  if (!CanBeSimpleBlock() && !is_key_ && !reference_block_timestamp_set_) {

-    return false;

-  }

-  return true;

-}

-bool Frame::CanBeSimpleBlock() const {

-  return additional_ == NULL && discard_padding_ == 0 && duration_ == 0;

-}

-void Frame::set_reference_block_timestamp(int64 reference_block_timestamp) {

-  reference_block_timestamp_ = reference_block_timestamp;

-  reference_block_timestamp_set_ = true;

-}

-///////////////////////////////////////////////////////////////

-//

-// CuePoint Class

-CuePoint::CuePoint()

-    : time_(0),

-      track_(0),

-      cluster_pos_(0),

-      block_number_(1),

-      output_block_number_(true) {}

-CuePoint::~CuePoint() {}

-bool CuePoint::Write(IMkvWriter* writer) const {

-  if (!writer || track_ < 1 || cluster_pos_ < 1)

-    return false;

-  uint64 size = EbmlElementSize(kMkvCueClusterPosition, cluster_pos_);

-  size += EbmlElementSize(kMkvCueTrack, track_);

-  if (output_block_number_ && block_number_ > 1)

-    size += EbmlElementSize(kMkvCueBlockNumber, block_number_);

-  const uint64 track_pos_size =

-      EbmlMasterElementSize(kMkvCueTrackPositions, size) + size;

-  const uint64 payload_size =

-      EbmlElementSize(kMkvCueTime, time_) + track_pos_size;

-  if (!WriteEbmlMasterElement(writer, kMkvCuePoint, payload_size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvCueTime, time_))

-    return false;

-  if (!WriteEbmlMasterElement(writer, kMkvCueTrackPositions, size))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvCueTrack, track_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvCueClusterPosition, cluster_pos_))

-    return false;

-  if (output_block_number_ && block_number_ > 1)

-    if (!WriteEbmlElement(writer, kMkvCueBlockNumber, block_number_))

-      return false;

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0)

-    return false;

-  if (stop_position - payload_position != static_cast<int64>(payload_size))

-    return false;

-  return true;

-}

-uint64 CuePoint::PayloadSize() const {

-  uint64 size = EbmlElementSize(kMkvCueClusterPosition, cluster_pos_);

-  size += EbmlElementSize(kMkvCueTrack, track_);

-  if (output_block_number_ && block_number_ > 1)

-    size += EbmlElementSize(kMkvCueBlockNumber, block_number_);

-  const uint64 track_pos_size =

-      EbmlMasterElementSize(kMkvCueTrackPositions, size) + size;

-  const uint64 payload_size =

-      EbmlElementSize(kMkvCueTime, time_) + track_pos_size;

-  return payload_size;

-}

-uint64 CuePoint::Size() const {

-  const uint64 payload_size = PayloadSize();

-  return EbmlMasterElementSize(kMkvCuePoint, payload_size) + payload_size;

-}

-///////////////////////////////////////////////////////////////

-//

-// Cues Class

-Cues::Cues()

-    : cue_entries_capacity_(0),

-      cue_entries_size_(0),

-      cue_entries_(NULL),

-      output_block_number_(true) {}

-Cues::~Cues() {

-  if (cue_entries_) {

-    for (int32 i = 0; i < cue_entries_size_; ++i) {

-      CuePoint* const cue = cue_entries_[i];

-      delete cue;

-    }

-    delete[] cue_entries_;

-  }

-}

-bool Cues::AddCue(CuePoint* cue) {

-  if (!cue)

-    return false;

-  if ((cue_entries_size_ + 1) > cue_entries_capacity_) {

-    // Add more CuePoints.

-    const int32 new_capacity =

-        (!cue_entries_capacity_) ? 2 : cue_entries_capacity_ * 2;

-    if (new_capacity < 1)

-      return false;

-    CuePoint** const cues =

-        new (std::nothrow) CuePoint*[new_capacity];  // NOLINT

-    if (!cues)

-      return false;

-    for (int32 i = 0; i < cue_entries_size_; ++i) {

-      cues[i] = cue_entries_[i];

-    }

-    delete[] cue_entries_;

-    cue_entries_ = cues;

-    cue_entries_capacity_ = new_capacity;

-  }

-  cue->set_output_block_number(output_block_number_);

-  cue_entries_[cue_entries_size_++] = cue;

-  return true;

-}

-CuePoint* Cues::GetCueByIndex(int32 index) const {

-  if (cue_entries_ == NULL)

-    return NULL;

-  if (index >= cue_entries_size_)

-    return NULL;

-  return cue_entries_[index];

-}

-uint64 Cues::Size() {

-  uint64 size = 0;

-  for (int32 i = 0; i < cue_entries_size_; ++i)

-    size += GetCueByIndex(i)->Size();

-  size += EbmlMasterElementSize(kMkvCues, size);

-  return size;

-}

-bool Cues::Write(IMkvWriter* writer) const {

-  if (!writer)

-    return false;

-  uint64 size = 0;

-  for (int32 i = 0; i < cue_entries_size_; ++i) {

-    const CuePoint* const cue = GetCueByIndex(i);

-    if (!cue)

-      return false;

-    size += cue->Size();

-  }

-  if (!WriteEbmlMasterElement(writer, kMkvCues, size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  for (int32 i = 0; i < cue_entries_size_; ++i) {

-    const CuePoint* const cue = GetCueByIndex(i);

-    if (!cue->Write(writer))

-      return false;

-  }

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0)

-    return false;

-  if (stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// ContentEncAESSettings Class

-ContentEncAESSettings::ContentEncAESSettings() : cipher_mode_(kCTR) {}

-uint64 ContentEncAESSettings::Size() const {

-  const uint64 payload = PayloadSize();

-  const uint64 size =

-      EbmlMasterElementSize(kMkvContentEncAESSettings, payload) + payload;

-  return size;

-}

-bool ContentEncAESSettings::Write(IMkvWriter* writer) const {

-  const uint64 payload = PayloadSize();

-  if (!WriteEbmlMasterElement(writer, kMkvContentEncAESSettings, payload))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvAESSettingsCipherMode, cipher_mode_))

-    return false;

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(payload))

-    return false;

-  return true;

-}

-uint64 ContentEncAESSettings::PayloadSize() const {

-  uint64 size = EbmlElementSize(kMkvAESSettingsCipherMode, cipher_mode_);

-  return size;

-}

-///////////////////////////////////////////////////////////////

-//

-// ContentEncoding Class

-ContentEncoding::ContentEncoding()

-    : enc_algo_(5),

-      enc_key_id_(NULL),

-      encoding_order_(0),

-      encoding_scope_(1),

-      encoding_type_(1),

-      enc_key_id_length_(0) {}

-ContentEncoding::~ContentEncoding() { delete[] enc_key_id_; }

-bool ContentEncoding::SetEncryptionID(const uint8* id, uint64 length) {

-  if (!id || length < 1)

-    return false;

-  delete[] enc_key_id_;

-  enc_key_id_ =

-      new (std::nothrow) uint8[static_cast<size_t>(length)];  // NOLINT

-  if (!enc_key_id_)

-    return false;

-  memcpy(enc_key_id_, id, static_cast<size_t>(length));

-  enc_key_id_length_ = length;

-  return true;

-}

-uint64 ContentEncoding::Size() const {

-  const uint64 encryption_size = EncryptionSize();

-  const uint64 encoding_size = EncodingSize(0, encryption_size);

-  const uint64 encodings_size =

-      EbmlMasterElementSize(kMkvContentEncoding, encoding_size) + encoding_size;

-  return encodings_size;

-}

-bool ContentEncoding::Write(IMkvWriter* writer) const {

-  const uint64 encryption_size = EncryptionSize();

-  const uint64 encoding_size = EncodingSize(0, encryption_size);

-  const uint64 size =

-      EbmlMasterElementSize(kMkvContentEncoding, encoding_size) + encoding_size;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlMasterElement(writer, kMkvContentEncoding, encoding_size))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvContentEncodingOrder, encoding_order_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvContentEncodingScope, encoding_scope_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvContentEncodingType, encoding_type_))

-    return false;

-  if (!WriteEbmlMasterElement(writer, kMkvContentEncryption, encryption_size))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvContentEncAlgo, enc_algo_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvContentEncKeyID, enc_key_id_,

-                        enc_key_id_length_))

-    return false;

-  if (!enc_aes_settings_.Write(writer))

-    return false;

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  return true;

-}

-uint64 ContentEncoding::EncodingSize(uint64 compresion_size,

-                                     uint64 encryption_size) const {

-  // TODO(fgalligan): Add support for compression settings.

-  if (compresion_size != 0)

-    return 0;

-  uint64 encoding_size = 0;

-  if (encryption_size > 0) {

-    encoding_size +=

-        EbmlMasterElementSize(kMkvContentEncryption, encryption_size) +

-        encryption_size;

-  }

-  encoding_size += EbmlElementSize(kMkvContentEncodingType, encoding_type_);

-  encoding_size += EbmlElementSize(kMkvContentEncodingScope, encoding_scope_);

-  encoding_size += EbmlElementSize(kMkvContentEncodingOrder, encoding_order_);

-  return encoding_size;

-}

-uint64 ContentEncoding::EncryptionSize() const {

-  const uint64 aes_size = enc_aes_settings_.Size();

-  uint64 encryption_size =

-      EbmlElementSize(kMkvContentEncKeyID, enc_key_id_, enc_key_id_length_);

-  encryption_size += EbmlElementSize(kMkvContentEncAlgo, enc_algo_);

-  return encryption_size + aes_size;

-}

-///////////////////////////////////////////////////////////////

-//

-// Track Class

-Track::Track(unsigned int* seed)

-    : codec_id_(NULL),

-      codec_private_(NULL),

-      language_(NULL),

-      max_block_additional_id_(0),

-      name_(NULL),

-      number_(0),

-      type_(0),

-      uid_(MakeUID(seed)),

-      codec_delay_(0),

-      seek_pre_roll_(0),

-      default_duration_(0),

-      codec_private_length_(0),

-      content_encoding_entries_(NULL),

-      content_encoding_entries_size_(0) {}

-Track::~Track() {

-  delete[] codec_id_;

-  delete[] codec_private_;

-  delete[] language_;

-  delete[] name_;

-  if (content_encoding_entries_) {

-    for (uint32 i = 0; i < content_encoding_entries_size_; ++i) {

-      ContentEncoding* const encoding = content_encoding_entries_[i];

-      delete encoding;

-    }

-    delete[] content_encoding_entries_;

-  }

-}

-bool Track::AddContentEncoding() {

-  const uint32 count = content_encoding_entries_size_ + 1;

-  ContentEncoding** const content_encoding_entries =

-      new (std::nothrow) ContentEncoding*[count];  // NOLINT

-  if (!content_encoding_entries)

-    return false;

-  ContentEncoding* const content_encoding =

-      new (std::nothrow) ContentEncoding();  // NOLINT

-  if (!content_encoding) {

-    delete[] content_encoding_entries;

-    return false;

-  }

-  for (uint32 i = 0; i < content_encoding_entries_size_; ++i) {

-    content_encoding_entries[i] = content_encoding_entries_[i];

-  }

-  delete[] content_encoding_entries_;

-  content_encoding_entries_ = content_encoding_entries;

-  content_encoding_entries_[content_encoding_entries_size_] = content_encoding;

-  content_encoding_entries_size_ = count;

-  return true;

-}

-ContentEncoding* Track::GetContentEncodingByIndex(uint32 index) const {

-  if (content_encoding_entries_ == NULL)

-    return NULL;

-  if (index >= content_encoding_entries_size_)

-    return NULL;

-  return content_encoding_entries_[index];

-}

-uint64 Track::PayloadSize() const {

-  uint64 size = EbmlElementSize(kMkvTrackNumber, number_);

-  size += EbmlElementSize(kMkvTrackUID, uid_);

-  size += EbmlElementSize(kMkvTrackType, type_);

-  if (codec_id_)

-    size += EbmlElementSize(kMkvCodecID, codec_id_);

-  if (codec_private_)

-    size += EbmlElementSize(kMkvCodecPrivate, codec_private_,

-                            codec_private_length_);

-  if (language_)

-    size += EbmlElementSize(kMkvLanguage, language_);

-  if (name_)

-    size += EbmlElementSize(kMkvName, name_);

-  if (max_block_additional_id_)

-    size += EbmlElementSize(kMkvMaxBlockAdditionID, max_block_additional_id_);

-  if (codec_delay_)

-    size += EbmlElementSize(kMkvCodecDelay, codec_delay_);

-  if (seek_pre_roll_)

-    size += EbmlElementSize(kMkvSeekPreRoll, seek_pre_roll_);

-  if (default_duration_)

-    size += EbmlElementSize(kMkvDefaultDuration, default_duration_);

-  if (content_encoding_entries_size_ > 0) {

-    uint64 content_encodings_size = 0;

-    for (uint32 i = 0; i < content_encoding_entries_size_; ++i) {

-      ContentEncoding* const encoding = content_encoding_entries_[i];

-      content_encodings_size += encoding->Size();

-    }

-    size +=

-        EbmlMasterElementSize(kMkvContentEncodings, content_encodings_size) +

-        content_encodings_size;

-  }

-  return size;

-}

-uint64 Track::Size() const {

-  uint64 size = PayloadSize();

-  size += EbmlMasterElementSize(kMkvTrackEntry, size);

-  return size;

-}

-bool Track::Write(IMkvWriter* writer) const {

-  if (!writer)

-    return false;

-  // mandatory elements without a default value.

-  if (!type_ || !codec_id_)

-    return false;

-  // |size| may be bigger than what is written out in this function because

-  // derived classes may write out more data in the Track element.

-  const uint64 payload_size = PayloadSize();

-  if (!WriteEbmlMasterElement(writer, kMkvTrackEntry, payload_size))

-    return false;

-  uint64 size = EbmlElementSize(kMkvTrackNumber, number_);

-  size += EbmlElementSize(kMkvTrackUID, uid_);

-  size += EbmlElementSize(kMkvTrackType, type_);

-  if (codec_id_)

-    size += EbmlElementSize(kMkvCodecID, codec_id_);

-  if (codec_private_)

-    size += EbmlElementSize(kMkvCodecPrivate, codec_private_,

-                            codec_private_length_);

-  if (language_)

-    size += EbmlElementSize(kMkvLanguage, language_);

-  if (name_)

-    size += EbmlElementSize(kMkvName, name_);

-  if (max_block_additional_id_)

-    size += EbmlElementSize(kMkvMaxBlockAdditionID, max_block_additional_id_);

-  if (codec_delay_)

-    size += EbmlElementSize(kMkvCodecDelay, codec_delay_);

-  if (seek_pre_roll_)

-    size += EbmlElementSize(kMkvSeekPreRoll, seek_pre_roll_);

-  if (default_duration_)

-    size += EbmlElementSize(kMkvDefaultDuration, default_duration_);

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvTrackNumber, number_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvTrackUID, uid_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvTrackType, type_))

-    return false;

-  if (max_block_additional_id_) {

-    if (!WriteEbmlElement(writer, kMkvMaxBlockAdditionID,

-                          max_block_additional_id_)) {

-      return false;

-    }

-  }

-  if (codec_delay_) {

-    if (!WriteEbmlElement(writer, kMkvCodecDelay, codec_delay_))

-      return false;

-  }

-  if (seek_pre_roll_) {

-    if (!WriteEbmlElement(writer, kMkvSeekPreRoll, seek_pre_roll_))

-      return false;

-  }

-  if (default_duration_) {

-    if (!WriteEbmlElement(writer, kMkvDefaultDuration, default_duration_))

-      return false;

-  }

-  if (codec_id_) {

-    if (!WriteEbmlElement(writer, kMkvCodecID, codec_id_))

-      return false;

-  }

-  if (codec_private_) {

-    if (!WriteEbmlElement(writer, kMkvCodecPrivate, codec_private_,

-                          codec_private_length_))

-      return false;

-  }

-  if (language_) {

-    if (!WriteEbmlElement(writer, kMkvLanguage, language_))

-      return false;

-  }

-  if (name_) {

-    if (!WriteEbmlElement(writer, kMkvName, name_))

-      return false;

-  }

-  int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  if (content_encoding_entries_size_ > 0) {

-    uint64 content_encodings_size = 0;

-    for (uint32 i = 0; i < content_encoding_entries_size_; ++i) {

-      ContentEncoding* const encoding = content_encoding_entries_[i];

-      content_encodings_size += encoding->Size();

-    }

-    if (!WriteEbmlMasterElement(writer, kMkvContentEncodings,

-                                content_encodings_size))

-      return false;

-    for (uint32 i = 0; i < content_encoding_entries_size_; ++i) {

-      ContentEncoding* const encoding = content_encoding_entries_[i];

-      if (!encoding->Write(writer))

-        return false;

-    }

-  }

-  stop_position = writer->Position();

-  if (stop_position < 0)

-    return false;

-  return true;

-}

-bool Track::SetCodecPrivate(const uint8* codec_private, uint64 length) {

-  if (!codec_private || length < 1)

-    return false;

-  delete[] codec_private_;

-  codec_private_ =

-      new (std::nothrow) uint8[static_cast<size_t>(length)];  // NOLINT

-  if (!codec_private_)

-    return false;

-  memcpy(codec_private_, codec_private, static_cast<size_t>(length));

-  codec_private_length_ = length;

-  return true;

-}

-void Track::set_codec_id(const char* codec_id) {

-  if (codec_id) {

-    delete[] codec_id_;

-    const size_t length = strlen(codec_id) + 1;

-    codec_id_ = new (std::nothrow) char[length];  // NOLINT

-    if (codec_id_) {

-#ifdef _MSC_VER

-      strcpy_s(codec_id_, length, codec_id);

-#else

-      strcpy(codec_id_, codec_id);

-#endif

-    }

-  }

-}

-// TODO(fgalligan): Vet the language parameter.

-void Track::set_language(const char* language) {

-  if (language) {

-    delete[] language_;

-    const size_t length = strlen(language) + 1;

-    language_ = new (std::nothrow) char[length];  // NOLINT

-    if (language_) {

-#ifdef _MSC_VER

-      strcpy_s(language_, length, language);

-#else

-      strcpy(language_, language);

-#endif

-    }

-  }

-}

-void Track::set_name(const char* name) {

-  if (name) {

-    delete[] name_;

-    const size_t length = strlen(name) + 1;

-    name_ = new (std::nothrow) char[length];  // NOLINT

-    if (name_) {

-#ifdef _MSC_VER

-      strcpy_s(name_, length, name);

-#else

-      strcpy(name_, name);

-#endif

-    }

-  }

-}

-///////////////////////////////////////////////////////////////

-//

-// VideoTrack Class

-VideoTrack::VideoTrack(unsigned int* seed)

-    : Track(seed),

-      display_height_(0),

-      display_width_(0),

-      crop_left_(0),

-      crop_right_(0),

-      crop_top_(0),

-      crop_bottom_(0),

-      frame_rate_(0.0),

-      height_(0),

-      stereo_mode_(0),

-      alpha_mode_(0),

-      width_(0) {}

-VideoTrack::~VideoTrack() {}

-bool VideoTrack::SetStereoMode(uint64 stereo_mode) {

-  if (stereo_mode != kMono && stereo_mode != kSideBySideLeftIsFirst &&

-      stereo_mode != kTopBottomRightIsFirst &&

-      stereo_mode != kTopBottomLeftIsFirst &&

-      stereo_mode != kSideBySideRightIsFirst)

-    return false;

-  stereo_mode_ = stereo_mode;

-  return true;

-}

-bool VideoTrack::SetAlphaMode(uint64 alpha_mode) {

-  if (alpha_mode != kNoAlpha && alpha_mode != kAlpha)

-    return false;

-  alpha_mode_ = alpha_mode;

-  return true;

-}

-uint64 VideoTrack::PayloadSize() const {

-  const uint64 parent_size = Track::PayloadSize();

-  uint64 size = VideoPayloadSize();

-  size += EbmlMasterElementSize(kMkvVideo, size);

-  return parent_size + size;

-}

-bool VideoTrack::Write(IMkvWriter* writer) const {

-  if (!Track::Write(writer))

-    return false;

-  const uint64 size = VideoPayloadSize();

-  if (!WriteEbmlMasterElement(writer, kMkvVideo, size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvPixelWidth, width_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvPixelHeight, height_))

-    return false;

-  if (display_width_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvDisplayWidth, display_width_))

-      return false;

-  }

-  if (display_height_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvDisplayHeight, display_height_))

-      return false;

-  }

-  if (crop_left_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvPixelCropLeft, crop_left_))

-      return false;

-  }

-  if (crop_right_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvPixelCropRight, crop_right_))

-      return false;

-  }

-  if (crop_top_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvPixelCropTop, crop_top_))

-      return false;

-  }

-  if (crop_bottom_ > 0) {

-    if (!WriteEbmlElement(writer, kMkvPixelCropBottom, crop_bottom_))

-      return false;

-  }

-  if (stereo_mode_ > kMono) {

-    if (!WriteEbmlElement(writer, kMkvStereoMode, stereo_mode_))

-      return false;

-  }

-  if (alpha_mode_ > kNoAlpha) {

-    if (!WriteEbmlElement(writer, kMkvAlphaMode, alpha_mode_))

-      return false;

-  }

-  if (frame_rate_ > 0.0) {

-    if (!WriteEbmlElement(writer, kMkvFrameRate,

-                          static_cast<float>(frame_rate_))) {

-      return false;

-    }

-  }

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size)) {

-    return false;

-  }

-  return true;

-}

-uint64 VideoTrack::VideoPayloadSize() const {

-  uint64 size = EbmlElementSize(kMkvPixelWidth, width_);

-  size += EbmlElementSize(kMkvPixelHeight, height_);

-  if (display_width_ > 0)

-    size += EbmlElementSize(kMkvDisplayWidth, display_width_);

-  if (display_height_ > 0)

-    size += EbmlElementSize(kMkvDisplayHeight, display_height_);

-  if (crop_left_ > 0)

-    size += EbmlElementSize(kMkvPixelCropLeft, crop_left_);

-  if (crop_right_ > 0)

-    size += EbmlElementSize(kMkvPixelCropRight, crop_right_);

-  if (crop_top_ > 0)

-    size += EbmlElementSize(kMkvPixelCropTop, crop_top_);

-  if (crop_bottom_ > 0)

-    size += EbmlElementSize(kMkvPixelCropBottom, crop_bottom_);

-  if (stereo_mode_ > kMono)

-    size += EbmlElementSize(kMkvStereoMode, stereo_mode_);

-  if (alpha_mode_ > kNoAlpha)

-    size += EbmlElementSize(kMkvAlphaMode, alpha_mode_);

-  if (frame_rate_ > 0.0)

-    size += EbmlElementSize(kMkvFrameRate, static_cast<float>(frame_rate_));

-  return size;

-}

-///////////////////////////////////////////////////////////////

-//

-// AudioTrack Class

-AudioTrack::AudioTrack(unsigned int* seed)

-    : Track(seed), bit_depth_(0), channels_(1), sample_rate_(0.0) {}

-AudioTrack::~AudioTrack() {}

-uint64 AudioTrack::PayloadSize() const {

-  const uint64 parent_size = Track::PayloadSize();

-  uint64 size =

-      EbmlElementSize(kMkvSamplingFrequency, static_cast<float>(sample_rate_));

-  size += EbmlElementSize(kMkvChannels, channels_);

-  if (bit_depth_ > 0)

-    size += EbmlElementSize(kMkvBitDepth, bit_depth_);

-  size += EbmlMasterElementSize(kMkvAudio, size);

-  return parent_size + size;

-}

-bool AudioTrack::Write(IMkvWriter* writer) const {

-  if (!Track::Write(writer))

-    return false;

-  // Calculate AudioSettings size.

-  uint64 size =

-      EbmlElementSize(kMkvSamplingFrequency, static_cast<float>(sample_rate_));

-  size += EbmlElementSize(kMkvChannels, channels_);

-  if (bit_depth_ > 0)

-    size += EbmlElementSize(kMkvBitDepth, bit_depth_);

-  if (!WriteEbmlMasterElement(writer, kMkvAudio, size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvSamplingFrequency,

-                        static_cast<float>(sample_rate_)))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvChannels, channels_))

-    return false;

-  if (bit_depth_ > 0)

-    if (!WriteEbmlElement(writer, kMkvBitDepth, bit_depth_))

-      return false;

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// Tracks Class

-const char Tracks::kOpusCodecId[] = "A_OPUS";

-const char Tracks::kVorbisCodecId[] = "A_VORBIS";

-const char Tracks::kVp8CodecId[] = "V_VP8";

-const char Tracks::kVp9CodecId[] = "V_VP9";

-const char Tracks::kVp10CodecId[] = "V_VP10";

-Tracks::Tracks() : track_entries_(NULL), track_entries_size_(0) {}

-Tracks::~Tracks() {

-  if (track_entries_) {

-    for (uint32 i = 0; i < track_entries_size_; ++i) {

-      Track* const track = track_entries_[i];

-      delete track;

-    }

-    delete[] track_entries_;

-  }

-}

-bool Tracks::AddTrack(Track* track, int32 number) {

-  if (number < 0)

-    return false;

-  // This muxer only supports track numbers in the range [1, 126], in

-  // order to be able (to use Matroska integer representation) to

-  // serialize the block header (of which the track number is a part)

-  // for a frame using exactly 4 bytes.

-  if (number > 0x7E)

-    return false;

-  uint32 track_num = number;

-  if (track_num > 0) {

-    // Check to make sure a track does not already have |track_num|.

-    for (uint32 i = 0; i < track_entries_size_; ++i) {

-      if (track_entries_[i]->number() == track_num)

-        return false;

-    }

-  }

-  const uint32 count = track_entries_size_ + 1;

-  Track** const track_entries = new (std::nothrow) Track*[count];  // NOLINT

-  if (!track_entries)

-    return false;

-  for (uint32 i = 0; i < track_entries_size_; ++i) {

-    track_entries[i] = track_entries_[i];

-  }

-  delete[] track_entries_;

-  // Find the lowest availible track number > 0.

-  if (track_num == 0) {

-    track_num = count;

-    // Check to make sure a track does not already have |track_num|.

-    bool exit = false;

-    do {

-      exit = true;

-      for (uint32 i = 0; i < track_entries_size_; ++i) {

-        if (track_entries[i]->number() == track_num) {

-          track_num++;

-          exit = false;

-          break;

-        }

-      }

-    } while (!exit);

-  }

-  track->set_number(track_num);

-  track_entries_ = track_entries;

-  track_entries_[track_entries_size_] = track;

-  track_entries_size_ = count;

-  return true;

-}

-const Track* Tracks::GetTrackByIndex(uint32 index) const {

-  if (track_entries_ == NULL)

-    return NULL;

-  if (index >= track_entries_size_)

-    return NULL;

-  return track_entries_[index];

-}

-Track* Tracks::GetTrackByNumber(uint64 track_number) const {

-  const int32 count = track_entries_size();

-  for (int32 i = 0; i < count; ++i) {

-    if (track_entries_[i]->number() == track_number)

-      return track_entries_[i];

-  }

-  return NULL;

-}

-bool Tracks::TrackIsAudio(uint64 track_number) const {

-  const Track* const track = GetTrackByNumber(track_number);

-  if (track->type() == kAudio)

-    return true;

-  return false;

-}

-bool Tracks::TrackIsVideo(uint64 track_number) const {

-  const Track* const track = GetTrackByNumber(track_number);

-  if (track->type() == kVideo)

-    return true;

-  return false;

-}

-bool Tracks::Write(IMkvWriter* writer) const {

-  uint64 size = 0;

-  const int32 count = track_entries_size();

-  for (int32 i = 0; i < count; ++i) {

-    const Track* const track = GetTrackByIndex(i);

-    if (!track)

-      return false;

-    size += track->Size();

-  }

-  if (!WriteEbmlMasterElement(writer, kMkvTracks, size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  for (int32 i = 0; i < count; ++i) {

-    const Track* const track = GetTrackByIndex(i);

-    if (!track->Write(writer))

-      return false;

-  }

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// Chapter Class

-bool Chapter::set_id(const char* id) { return StrCpy(id, &id_); }

-void Chapter::set_time(const Segment& segment, uint64 start_ns, uint64 end_ns) {

-  const SegmentInfo* const info = segment.GetSegmentInfo();

-  const uint64 timecode_scale = info->timecode_scale();

-  start_timecode_ = start_ns / timecode_scale;

-  end_timecode_ = end_ns / timecode_scale;

-}

-bool Chapter::add_string(const char* title, const char* language,

-                         const char* country) {

-  if (!ExpandDisplaysArray())

-    return false;

-  Display& d = displays_[displays_count_++];

-  d.Init();

-  if (!d.set_title(title))

-    return false;

-  if (!d.set_language(language))

-    return false;

-  if (!d.set_country(country))

-    return false;

-  return true;

-}

-Chapter::Chapter() {

-  // This ctor only constructs the object.  Proper initialization is

-  // done in Init() (called in Chapters::AddChapter()).  The only

-  // reason we bother implementing this ctor is because we had to

-  // declare it as private (along with the dtor), in order to prevent

-  // clients from creating Chapter instances (a privelege we grant

-  // only to the Chapters class).  Doing no initialization here also

-  // means that creating arrays of chapter objects is more efficient,

-  // because we only initialize each new chapter object as it becomes

-  // active on the array.

-}

-Chapter::~Chapter() {}

-void Chapter::Init(unsigned int* seed) {

-  id_ = NULL;

-  start_timecode_ = 0;

-  end_timecode_ = 0;

-  displays_ = NULL;

-  displays_size_ = 0;

-  displays_count_ = 0;

-  uid_ = MakeUID(seed);

-}

-void Chapter::ShallowCopy(Chapter* dst) const {

-  dst->id_ = id_;

-  dst->start_timecode_ = start_timecode_;

-  dst->end_timecode_ = end_timecode_;

-  dst->uid_ = uid_;

-  dst->displays_ = displays_;

-  dst->displays_size_ = displays_size_;

-  dst->displays_count_ = displays_count_;

-}

-void Chapter::Clear() {

-  StrCpy(NULL, &id_);

-  while (displays_count_ > 0) {

-    Display& d = displays_[--displays_count_];

-    d.Clear();

-  }

-  delete[] displays_;

-  displays_ = NULL;

-  displays_size_ = 0;

-}

-bool Chapter::ExpandDisplaysArray() {

-  if (displays_size_ > displays_count_)

-    return true;  // nothing to do yet

-  const int size = (displays_size_ == 0) ? 1 : 2 * displays_size_;

-  Display* const displays = new (std::nothrow) Display[size];  // NOLINT

-  if (displays == NULL)

-    return false;

-  for (int idx = 0; idx < displays_count_; ++idx) {

-    displays[idx] = displays_[idx];  // shallow copy

-  }

-  delete[] displays_;

-  displays_ = displays;

-  displays_size_ = size;

-  return true;

-}

-uint64 Chapter::WriteAtom(IMkvWriter* writer) const {

-  uint64 payload_size = EbmlElementSize(kMkvChapterStringUID, id_) +

-                        EbmlElementSize(kMkvChapterUID, uid_) +

-                        EbmlElementSize(kMkvChapterTimeStart, start_timecode_) +

-                        EbmlElementSize(kMkvChapterTimeEnd, end_timecode_);

-  for (int idx = 0; idx < displays_count_; ++idx) {

-    const Display& d = displays_[idx];

-    payload_size += d.WriteDisplay(NULL);

-  }

-  const uint64 atom_size =

-      EbmlMasterElementSize(kMkvChapterAtom, payload_size) + payload_size;

-  if (writer == NULL)

-    return atom_size;

-  const int64 start = writer->Position();

-  if (!WriteEbmlMasterElement(writer, kMkvChapterAtom, payload_size))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvChapterStringUID, id_))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvChapterUID, uid_))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvChapterTimeStart, start_timecode_))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvChapterTimeEnd, end_timecode_))

-    return 0;

-  for (int idx = 0; idx < displays_count_; ++idx) {

-    const Display& d = displays_[idx];

-    if (!d.WriteDisplay(writer))

-      return 0;

-  }

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != atom_size)

-    return 0;

-  return atom_size;

-}

-void Chapter::Display::Init() {

-  title_ = NULL;

-  language_ = NULL;

-  country_ = NULL;

-}

-void Chapter::Display::Clear() {

-  StrCpy(NULL, &title_);

-  StrCpy(NULL, &language_);

-  StrCpy(NULL, &country_);

-}

-bool Chapter::Display::set_title(const char* title) {

-  return StrCpy(title, &title_);

-}

-bool Chapter::Display::set_language(const char* language) {

-  return StrCpy(language, &language_);

-}

-bool Chapter::Display::set_country(const char* country) {

-  return StrCpy(country, &country_);

-}

-uint64 Chapter::Display::WriteDisplay(IMkvWriter* writer) const {

-  uint64 payload_size = EbmlElementSize(kMkvChapString, title_);

-  if (language_)

-    payload_size += EbmlElementSize(kMkvChapLanguage, language_);

-  if (country_)

-    payload_size += EbmlElementSize(kMkvChapCountry, country_);

-  const uint64 display_size =

-      EbmlMasterElementSize(kMkvChapterDisplay, payload_size) + payload_size;

-  if (writer == NULL)

-    return display_size;

-  const int64 start = writer->Position();

-  if (!WriteEbmlMasterElement(writer, kMkvChapterDisplay, payload_size))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvChapString, title_))

-    return 0;

-  if (language_) {

-    if (!WriteEbmlElement(writer, kMkvChapLanguage, language_))

-      return 0;

-  }

-  if (country_) {

-    if (!WriteEbmlElement(writer, kMkvChapCountry, country_))

-      return 0;

-  }

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != display_size)

-    return 0;

-  return display_size;

-}

-///////////////////////////////////////////////////////////////

-//

-// Chapters Class

-Chapters::Chapters() : chapters_size_(0), chapters_count_(0), chapters_(NULL) {}

-Chapters::~Chapters() {

-  while (chapters_count_ > 0) {

-    Chapter& chapter = chapters_[--chapters_count_];

-    chapter.Clear();

-  }

-  delete[] chapters_;

-  chapters_ = NULL;

-}

-int Chapters::Count() const { return chapters_count_; }

-Chapter* Chapters::AddChapter(unsigned int* seed) {

-  if (!ExpandChaptersArray())

-    return NULL;

-  Chapter& chapter = chapters_[chapters_count_++];

-  chapter.Init(seed);

-  return &chapter;

-}

-bool Chapters::Write(IMkvWriter* writer) const {

-  if (writer == NULL)

-    return false;

-  const uint64 payload_size = WriteEdition(NULL);  // return size only

-  if (!WriteEbmlMasterElement(writer, kMkvChapters, payload_size))

-    return false;

-  const int64 start = writer->Position();

-  if (WriteEdition(writer) == 0)  // error

-    return false;

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != payload_size)

-    return false;

-  return true;

-}

-bool Chapters::ExpandChaptersArray() {

-  if (chapters_size_ > chapters_count_)

-    return true;  // nothing to do yet

-  const int size = (chapters_size_ == 0) ? 1 : 2 * chapters_size_;

-  Chapter* const chapters = new (std::nothrow) Chapter[size];  // NOLINT

-  if (chapters == NULL)

-    return false;

-  for (int idx = 0; idx < chapters_count_; ++idx) {

-    const Chapter& src = chapters_[idx];

-    Chapter* const dst = chapters + idx;

-    src.ShallowCopy(dst);

-  }

-  delete[] chapters_;

-  chapters_ = chapters;

-  chapters_size_ = size;

-  return true;

-}

-uint64 Chapters::WriteEdition(IMkvWriter* writer) const {

-  uint64 payload_size = 0;

-  for (int idx = 0; idx < chapters_count_; ++idx) {

-    const Chapter& chapter = chapters_[idx];

-    payload_size += chapter.WriteAtom(NULL);

-  }

-  const uint64 edition_size =

-      EbmlMasterElementSize(kMkvEditionEntry, payload_size) + payload_size;

-  if (writer == NULL)  // return size only

-    return edition_size;

-  const int64 start = writer->Position();

-  if (!WriteEbmlMasterElement(writer, kMkvEditionEntry, payload_size))

-    return 0;  // error

-  for (int idx = 0; idx < chapters_count_; ++idx) {

-    const Chapter& chapter = chapters_[idx];

-    const uint64 chapter_size = chapter.WriteAtom(writer);

-    if (chapter_size == 0)  // error

-      return 0;

-  }

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != edition_size)

-    return 0;

-  return edition_size;

-}

-// Tag Class

-bool Tag::add_simple_tag(const char* tag_name, const char* tag_string) {

-  if (!ExpandSimpleTagsArray())

-    return false;

-  SimpleTag& st = simple_tags_[simple_tags_count_++];

-  st.Init();

-  if (!st.set_tag_name(tag_name))

-    return false;

-  if (!st.set_tag_string(tag_string))

-    return false;

-  return true;

-}

-Tag::Tag() {

-  simple_tags_ = NULL;

-  simple_tags_size_ = 0;

-  simple_tags_count_ = 0;

-}

-Tag::~Tag() {}

-void Tag::ShallowCopy(Tag* dst) const {

-  dst->simple_tags_ = simple_tags_;

-  dst->simple_tags_size_ = simple_tags_size_;

-  dst->simple_tags_count_ = simple_tags_count_;

-}

-void Tag::Clear() {

-  while (simple_tags_count_ > 0) {

-    SimpleTag& st = simple_tags_[--simple_tags_count_];

-    st.Clear();

-  }

-  delete[] simple_tags_;

-  simple_tags_ = NULL;

-  simple_tags_size_ = 0;

-}

-bool Tag::ExpandSimpleTagsArray() {

-  if (simple_tags_size_ > simple_tags_count_)

-    return true;  // nothing to do yet

-  const int size = (simple_tags_size_ == 0) ? 1 : 2 * simple_tags_size_;

-  SimpleTag* const simple_tags = new (std::nothrow) SimpleTag[size];  // NOLINT

-  if (simple_tags == NULL)

-    return false;

-  for (int idx = 0; idx < simple_tags_count_; ++idx) {

-    simple_tags[idx] = simple_tags_[idx];  // shallow copy

-  }

-  delete[] simple_tags_;

-  simple_tags_ = simple_tags;

-  simple_tags_size_ = size;

-  return true;

-}

-uint64 Tag::Write(IMkvWriter* writer) const {

-  uint64 payload_size = 0;

-  for (int idx = 0; idx < simple_tags_count_; ++idx) {

-    const SimpleTag& st = simple_tags_[idx];

-    payload_size += st.Write(NULL);

-  }

-  const uint64 tag_size =

-      EbmlMasterElementSize(kMkvTag, payload_size) + payload_size;

-  if (writer == NULL)

-    return tag_size;

-  const int64 start = writer->Position();

-  if (!WriteEbmlMasterElement(writer, kMkvTag, payload_size))

-    return 0;

-  for (int idx = 0; idx < simple_tags_count_; ++idx) {

-    const SimpleTag& st = simple_tags_[idx];

-    if (!st.Write(writer))

-      return 0;

-  }

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != tag_size)

-    return 0;

-  return tag_size;

-}

-// Tag::SimpleTag

-void Tag::SimpleTag::Init() {

-  tag_name_ = NULL;

-  tag_string_ = NULL;

-}

-void Tag::SimpleTag::Clear() {

-  StrCpy(NULL, &tag_name_);

-  StrCpy(NULL, &tag_string_);

-}

-bool Tag::SimpleTag::set_tag_name(const char* tag_name) {

-  return StrCpy(tag_name, &tag_name_);

-}

-bool Tag::SimpleTag::set_tag_string(const char* tag_string) {

-  return StrCpy(tag_string, &tag_string_);

-}

-uint64 Tag::SimpleTag::Write(IMkvWriter* writer) const {

-  uint64 payload_size = EbmlElementSize(kMkvTagName, tag_name_);

-  payload_size += EbmlElementSize(kMkvTagString, tag_string_);

-  const uint64 simple_tag_size =

-      EbmlMasterElementSize(kMkvSimpleTag, payload_size) + payload_size;

-  if (writer == NULL)

-    return simple_tag_size;

-  const int64 start = writer->Position();

-  if (!WriteEbmlMasterElement(writer, kMkvSimpleTag, payload_size))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvTagName, tag_name_))

-    return 0;

-  if (!WriteEbmlElement(writer, kMkvTagString, tag_string_))

-    return 0;

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != simple_tag_size)

-    return 0;

-  return simple_tag_size;

-}

-// Tags Class

-Tags::Tags() : tags_size_(0), tags_count_(0), tags_(NULL) {}

-Tags::~Tags() {

-  while (tags_count_ > 0) {

-    Tag& tag = tags_[--tags_count_];

-    tag.Clear();

-  }

-  delete[] tags_;

-  tags_ = NULL;

-}

-int Tags::Count() const { return tags_count_; }

-Tag* Tags::AddTag() {

-  if (!ExpandTagsArray())

-    return NULL;

-  Tag& tag = tags_[tags_count_++];

-  return &tag;

-}

-bool Tags::Write(IMkvWriter* writer) const {

-  if (writer == NULL)

-    return false;

-  uint64 payload_size = 0;

-  for (int idx = 0; idx < tags_count_; ++idx) {

-    const Tag& tag = tags_[idx];

-    payload_size += tag.Write(NULL);

-  }

-  if (!WriteEbmlMasterElement(writer, kMkvTags, payload_size))

-    return false;

-  const int64 start = writer->Position();

-  for (int idx = 0; idx < tags_count_; ++idx) {

-    const Tag& tag = tags_[idx];

-    const uint64 tag_size = tag.Write(writer);

-    if (tag_size == 0)  // error

-      return 0;

-  }

-  const int64 stop = writer->Position();

-  if (stop >= start && uint64(stop - start) != payload_size)

-    return false;

-  return true;

-}

-bool Tags::ExpandTagsArray() {

-  if (tags_size_ > tags_count_)

-    return true;  // nothing to do yet

-  const int size = (tags_size_ == 0) ? 1 : 2 * tags_size_;

-  Tag* const tags = new (std::nothrow) Tag[size];  // NOLINT

-  if (tags == NULL)

-    return false;

-  for (int idx = 0; idx < tags_count_; ++idx) {

-    const Tag& src = tags_[idx];

-    Tag* const dst = tags + idx;

-    src.ShallowCopy(dst);

-  }

-  delete[] tags_;

-  tags_ = tags;

-  tags_size_ = size;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// Cluster class

-Cluster::Cluster(uint64 timecode, int64 cues_pos, uint64 timecode_scale)

-    : blocks_added_(0),

-      finalized_(false),

-      header_written_(false),

-      payload_size_(0),

-      position_for_cues_(cues_pos),

-      size_position_(-1),

-      timecode_(timecode),

-      timecode_scale_(timecode_scale),

-      writer_(NULL) {}

-Cluster::~Cluster() {}

-bool Cluster::Init(IMkvWriter* ptr_writer) {

-  if (!ptr_writer) {

-    return false;

-  }

-  writer_ = ptr_writer;

-  return true;

-}

-bool Cluster::AddFrame(const Frame* const frame) { return DoWriteFrame(frame); }

-bool Cluster::AddFrame(const uint8* data, uint64 length, uint64 track_number,

-                       uint64 abs_timecode, bool is_key) {

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_track_number(track_number);

-  frame.set_timestamp(abs_timecode);

-  frame.set_is_key(is_key);

-  return DoWriteFrame(&frame);

-}

-bool Cluster::AddFrameWithAdditional(const uint8* data, uint64 length,

-                                     const uint8* additional,

-                                     uint64 additional_length, uint64 add_id,

-                                     uint64 track_number, uint64 abs_timecode,

-                                     bool is_key) {

-  if (!additional || additional_length == 0) {

-    return false;

-  }

-  Frame frame;

-  if (!frame.Init(data, length) ||

-      !frame.AddAdditionalData(additional, additional_length, add_id)) {

-    return false;

-  }

-  frame.set_track_number(track_number);

-  frame.set_timestamp(abs_timecode);

-  frame.set_is_key(is_key);

-  return DoWriteFrame(&frame);

-}

-bool Cluster::AddFrameWithDiscardPadding(const uint8* data, uint64 length,

-                                         int64 discard_padding,

-                                         uint64 track_number,

-                                         uint64 abs_timecode, bool is_key) {

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_discard_padding(discard_padding);

-  frame.set_track_number(track_number);

-  frame.set_timestamp(abs_timecode);

-  frame.set_is_key(is_key);

-  return DoWriteFrame(&frame);

-}

-bool Cluster::AddMetadata(const uint8* data, uint64 length, uint64 track_number,

-                          uint64 abs_timecode, uint64 duration_timecode) {

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_track_number(track_number);

-  frame.set_timestamp(abs_timecode);

-  frame.set_duration(duration_timecode);

-  frame.set_is_key(true);  // All metadata blocks are keyframes.

-  return DoWriteFrame(&frame);

-}

-void Cluster::AddPayloadSize(uint64 size) { payload_size_ += size; }

-bool Cluster::Finalize() {

-  if (!writer_ || finalized_ || size_position_ == -1)

-    return false;

-  if (writer_->Seekable()) {

-    const int64 pos = writer_->Position();

-    if (writer_->Position(size_position_))

-      return false;

-    if (WriteUIntSize(writer_, payload_size(), 8))

-      return false;

-    if (writer_->Position(pos))

-      return false;

-  }

-  finalized_ = true;

-  return true;

-}

-uint64 Cluster::Size() const {

-  const uint64 element_size =

-      EbmlMasterElementSize(kMkvCluster, 0xFFFFFFFFFFFFFFFFULL) + payload_size_;

-  return element_size;

-}

-bool Cluster::PreWriteBlock() {

-  if (finalized_)

-    return false;

-  if (!header_written_) {

-    if (!WriteClusterHeader())

-      return false;

-  }

-  return true;

-}

-void Cluster::PostWriteBlock(uint64 element_size) {

-  AddPayloadSize(element_size);

-  ++blocks_added_;

-}

-int64 Cluster::GetRelativeTimecode(int64 abs_timecode) const {

-  const int64 cluster_timecode = this->Cluster::timecode();

-  const int64 rel_timecode =

-      static_cast<int64>(abs_timecode) - cluster_timecode;

-  if (rel_timecode < 0 || rel_timecode > kMaxBlockTimecode)

-    return -1;

-  return rel_timecode;

-}

-bool Cluster::DoWriteFrame(const Frame* const frame) {

-  if (!frame || !frame->IsValid())

-    return false;

-  if (!PreWriteBlock())

-    return false;

-  const uint64 element_size = WriteFrame(writer_, frame, this);

-  if (element_size == 0)

-    return false;

-  PostWriteBlock(element_size);

-  return true;

-}

-bool Cluster::WriteClusterHeader() {

-  if (finalized_)

-    return false;

-  if (WriteID(writer_, kMkvCluster))

-    return false;

-  // Save for later.

-  size_position_ = writer_->Position();

-  // Write "unknown" (EBML coded -1) as cluster size value. We need to write 8

-  // bytes because we do not know how big our cluster will be.

-  if (SerializeInt(writer_, kEbmlUnknownValue, 8))

-    return false;

-  if (!WriteEbmlElement(writer_, kMkvTimecode, timecode()))

-    return false;

-  AddPayloadSize(EbmlElementSize(kMkvTimecode, timecode()));

-  header_written_ = true;

-  return true;

-}

-///////////////////////////////////////////////////////////////

-//

-// SeekHead Class

-SeekHead::SeekHead() : start_pos_(0ULL) {

-  for (int32 i = 0; i < kSeekEntryCount; ++i) {

-    seek_entry_id_[i] = 0;

-    seek_entry_pos_[i] = 0;

-  }

-}

-SeekHead::~SeekHead() {}

-bool SeekHead::Finalize(IMkvWriter* writer) const {

-  if (writer->Seekable()) {

-    if (start_pos_ == -1)

-      return false;

-    uint64 payload_size = 0;

-    uint64 entry_size[kSeekEntryCount];

-    for (int32 i = 0; i < kSeekEntryCount; ++i) {

-      if (seek_entry_id_[i] != 0) {

-        entry_size[i] =

-            EbmlElementSize(kMkvSeekID, static_cast<uint64>(seek_entry_id_[i]));

-        entry_size[i] += EbmlElementSize(kMkvSeekPosition, seek_entry_pos_[i]);

-        payload_size +=

-            EbmlMasterElementSize(kMkvSeek, entry_size[i]) + entry_size[i];

-      }

-    }

-    // No SeekHead elements

-    if (payload_size == 0)

-      return true;

-    const int64 pos = writer->Position();

-    if (writer->Position(start_pos_))

-      return false;

-    if (!WriteEbmlMasterElement(writer, kMkvSeekHead, payload_size))

-      return false;

-    for (int32 i = 0; i < kSeekEntryCount; ++i) {

-      if (seek_entry_id_[i] != 0) {

-        if (!WriteEbmlMasterElement(writer, kMkvSeek, entry_size[i]))

-          return false;

-        if (!WriteEbmlElement(writer, kMkvSeekID,

-                              static_cast<uint64>(seek_entry_id_[i])))

-          return false;

-        if (!WriteEbmlElement(writer, kMkvSeekPosition, seek_entry_pos_[i]))

-          return false;

-      }

-    }

-    const uint64 total_entry_size = kSeekEntryCount * MaxEntrySize();

-    const uint64 total_size =

-        EbmlMasterElementSize(kMkvSeekHead, total_entry_size) +

-        total_entry_size;

-    const int64 size_left = total_size - (writer->Position() - start_pos_);

-    const uint64 bytes_written = WriteVoidElement(writer, size_left);

-    if (!bytes_written)

-      return false;

-    if (writer->Position(pos))

-      return false;

-  }

-  return true;

-}

-bool SeekHead::Write(IMkvWriter* writer) {

-  const uint64 entry_size = kSeekEntryCount * MaxEntrySize();

-  const uint64 size = EbmlMasterElementSize(kMkvSeekHead, entry_size);

-  start_pos_ = writer->Position();

-  const uint64 bytes_written = WriteVoidElement(writer, size + entry_size);

-  if (!bytes_written)

-    return false;

-  return true;

-}

-bool SeekHead::AddSeekEntry(uint32 id, uint64 pos) {

-  for (int32 i = 0; i < kSeekEntryCount; ++i) {

-    if (seek_entry_id_[i] == 0) {

-      seek_entry_id_[i] = id;

-      seek_entry_pos_[i] = pos;

-      return true;

-    }

-  }

-  return false;

-}

-uint32 SeekHead::GetId(int index) const {

-  if (index < 0 || index >= kSeekEntryCount)

-    return UINT_MAX;

-  return seek_entry_id_[index];

-}

-uint64 SeekHead::GetPosition(int index) const {

-  if (index < 0 || index >= kSeekEntryCount)

-    return ULLONG_MAX;

-  return seek_entry_pos_[index];

-}

-bool SeekHead::SetSeekEntry(int index, uint32 id, uint64 position) {

-  if (index < 0 || index >= kSeekEntryCount)

-    return false;

-  seek_entry_id_[index] = id;

-  seek_entry_pos_[index] = position;

-  return true;

-}

-uint64 SeekHead::MaxEntrySize() const {

-  const uint64 max_entry_payload_size =

-      EbmlElementSize(kMkvSeekID, 0xffffffffULL) +

-      EbmlElementSize(kMkvSeekPosition, 0xffffffffffffffffULL);

-  const uint64 max_entry_size =

-      EbmlMasterElementSize(kMkvSeek, max_entry_payload_size) +

-      max_entry_payload_size;

-  return max_entry_size;

-}

-///////////////////////////////////////////////////////////////

-//

-// SegmentInfo Class

-SegmentInfo::SegmentInfo()

-    : duration_(-1.0),

-      muxing_app_(NULL),

-      timecode_scale_(1000000ULL),

-      writing_app_(NULL),

-      date_utc_(LLONG_MIN),

-      duration_pos_(-1) {}

-SegmentInfo::~SegmentInfo() {

-  delete[] muxing_app_;

-  delete[] writing_app_;

-}

-bool SegmentInfo::Init() {

-  int32 major;

-  int32 minor;

-  int32 build;

-  int32 revision;

-  GetVersion(&major, &minor, &build, &revision);

-  char temp[256];

-#ifdef _MSC_VER

-  sprintf_s(temp, sizeof(temp) / sizeof(temp[0]), "libwebm-%d.%d.%d.%d", major,

-            minor, build, revision);

-#else

-  snprintf(temp, sizeof(temp) / sizeof(temp[0]), "libwebm-%d.%d.%d.%d", major,

-           minor, build, revision);

-#endif

-  const size_t app_len = strlen(temp) + 1;

-  delete[] muxing_app_;

-  muxing_app_ = new (std::nothrow) char[app_len];  // NOLINT

-  if (!muxing_app_)

-    return false;

-#ifdef _MSC_VER

-  strcpy_s(muxing_app_, app_len, temp);

-#else

-  strcpy(muxing_app_, temp);

-#endif

-  set_writing_app(temp);

-  if (!writing_app_)

-    return false;

-  return true;

-}

-bool SegmentInfo::Finalize(IMkvWriter* writer) const {

-  if (!writer)

-    return false;

-  if (duration_ > 0.0) {

-    if (writer->Seekable()) {

-      if (duration_pos_ == -1)

-        return false;

-      const int64 pos = writer->Position();

-      if (writer->Position(duration_pos_))

-        return false;

-      if (!WriteEbmlElement(writer, kMkvDuration,

-                            static_cast<float>(duration_)))

-        return false;

-      if (writer->Position(pos))

-        return false;

-    }

-  }

-  return true;

-}

-bool SegmentInfo::Write(IMkvWriter* writer) {

-  if (!writer || !muxing_app_ || !writing_app_)

-    return false;

-  uint64 size = EbmlElementSize(kMkvTimecodeScale, timecode_scale_);

-  if (duration_ > 0.0)

-    size += EbmlElementSize(kMkvDuration, static_cast<float>(duration_));

-  if (date_utc_ != LLONG_MIN)

-    size += EbmlDateElementSize(kMkvDateUTC);

-  size += EbmlElementSize(kMkvMuxingApp, muxing_app_);

-  size += EbmlElementSize(kMkvWritingApp, writing_app_);

-  if (!WriteEbmlMasterElement(writer, kMkvInfo, size))

-    return false;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return false;

-  if (!WriteEbmlElement(writer, kMkvTimecodeScale, timecode_scale_))

-    return false;

-  if (duration_ > 0.0) {

-    // Save for later

-    duration_pos_ = writer->Position();

-    if (!WriteEbmlElement(writer, kMkvDuration, static_cast<float>(duration_)))

-      return false;

-  }

-  if (date_utc_ != LLONG_MIN)

-    WriteEbmlDateElement(writer, kMkvDateUTC, date_utc_);

-  if (!WriteEbmlElement(writer, kMkvMuxingApp, muxing_app_))

-    return false;

-  if (!WriteEbmlElement(writer, kMkvWritingApp, writing_app_))

-    return false;

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(size))

-    return false;

-  return true;

-}

-void SegmentInfo::set_muxing_app(const char* app) {

-  if (app) {

-    const size_t length = strlen(app) + 1;

-    char* temp_str = new (std::nothrow) char[length];  // NOLINT

-    if (!temp_str)

-      return;

-#ifdef _MSC_VER

-    strcpy_s(temp_str, length, app);

-#else

-    strcpy(temp_str, app);

-#endif

-    delete[] muxing_app_;

-    muxing_app_ = temp_str;

-  }

-}

-void SegmentInfo::set_writing_app(const char* app) {

-  if (app) {

-    const size_t length = strlen(app) + 1;

-    char* temp_str = new (std::nothrow) char[length];  // NOLINT

-    if (!temp_str)

-      return;

-#ifdef _MSC_VER

-    strcpy_s(temp_str, length, app);

-#else

-    strcpy(temp_str, app);

-#endif

-    delete[] writing_app_;

-    writing_app_ = temp_str;

-  }

-}

-///////////////////////////////////////////////////////////////

-//

-// Segment Class

-Segment::Segment()

-    : chunk_count_(0),

-      chunk_name_(NULL),

-      chunk_writer_cluster_(NULL),

-      chunk_writer_cues_(NULL),

-      chunk_writer_header_(NULL),

-      chunking_(false),

-      chunking_base_name_(NULL),

-      cluster_list_(NULL),

-      cluster_list_capacity_(0),

-      cluster_list_size_(0),

-      cues_position_(kAfterClusters),

-      cues_track_(0),

-      force_new_cluster_(false),

-      frames_(NULL),

-      frames_capacity_(0),

-      frames_size_(0),

-      has_video_(false),

-      header_written_(false),

-      last_block_duration_(0),

-      last_timestamp_(0),

-      max_cluster_duration_(kDefaultMaxClusterDuration),

-      max_cluster_size_(0),

-      mode_(kFile),

-      new_cuepoint_(false),

-      output_cues_(true),

-      payload_pos_(0),

-      size_position_(0),

-      doc_type_version_(kDefaultDocTypeVersion),

-      doc_type_version_written_(0),

-      writer_cluster_(NULL),

-      writer_cues_(NULL),

-      writer_header_(NULL) {

-  const time_t curr_time = time(NULL);

-  seed_ = static_cast<unsigned int>(curr_time);

-#ifdef _WIN32

-  srand(seed_);

-#endif

-}

-Segment::~Segment() {

-  if (cluster_list_) {

-    for (int32 i = 0; i < cluster_list_size_; ++i) {

-      Cluster* const cluster = cluster_list_[i];

-      delete cluster;

-    }

-    delete[] cluster_list_;

-  }

-  if (frames_) {

-    for (int32 i = 0; i < frames_size_; ++i) {

-      Frame* const frame = frames_[i];

-      delete frame;

-    }

-    delete[] frames_;

-  }

-  delete[] chunk_name_;

-  delete[] chunking_base_name_;

-  if (chunk_writer_cluster_) {

-    chunk_writer_cluster_->Close();

-    delete chunk_writer_cluster_;

-  }

-  if (chunk_writer_cues_) {

-    chunk_writer_cues_->Close();

-    delete chunk_writer_cues_;

-  }

-  if (chunk_writer_header_) {

-    chunk_writer_header_->Close();

-    delete chunk_writer_header_;

-  }

-}

-void Segment::MoveCuesBeforeClustersHelper(uint64 diff, int32 index,

-                                           uint64* cues_size) {

-  CuePoint* const cue_point = cues_.GetCueByIndex(index);

-  if (cue_point == NULL)

-    return;

-  const uint64 old_cue_point_size = cue_point->Size();

-  const uint64 cluster_pos = cue_point->cluster_pos() + diff;

-  cue_point->set_cluster_pos(cluster_pos);  // update the new cluster position

-  // New size of the cue is computed as follows

-  //    Let a = current sum of size of all CuePoints

-  //    Let b = Increase in Cue Point's size due to this iteration

-  //    Let c = Increase in size of Cues Element's length due to this iteration

-  //            (This is computed as CodedSize(a + b) - CodedSize(a))

-  //    Let d = b + c. Now d is the |diff| passed to the next recursive call.

-  //    Let e = a + b. Now e is the |cues_size| passed to the next recursive

-  //                   call.

-  const uint64 cue_point_size_diff = cue_point->Size() - old_cue_point_size;

-  const uint64 cue_size_diff =

-      GetCodedUIntSize(*cues_size + cue_point_size_diff) -

-      GetCodedUIntSize(*cues_size);

-  *cues_size += cue_point_size_diff;

-  diff = cue_size_diff + cue_point_size_diff;

-  if (diff > 0) {

-    for (int32 i = 0; i < cues_.cue_entries_size(); ++i) {

-      MoveCuesBeforeClustersHelper(diff, i, cues_size);

-    }

-  }

-}

-void Segment::MoveCuesBeforeClusters() {

-  const uint64 current_cue_size = cues_.Size();

-  uint64 cue_size = 0;

-  for (int32 i = 0; i < cues_.cue_entries_size(); ++i)

-    cue_size += cues_.GetCueByIndex(i)->Size();

-  for (int32 i = 0; i < cues_.cue_entries_size(); ++i)

-    MoveCuesBeforeClustersHelper(current_cue_size, i, &cue_size);

-  // Adjust the Seek Entry to reflect the change in position

-  // of Cluster and Cues

-  int32 cluster_index = 0;

-  int32 cues_index = 0;

-  for (int32 i = 0; i < SeekHead::kSeekEntryCount; ++i) {

-    if (seek_head_.GetId(i) == kMkvCluster)

-      cluster_index = i;

-    if (seek_head_.GetId(i) == kMkvCues)

-      cues_index = i;

-  }

-  seek_head_.SetSeekEntry(cues_index, kMkvCues,

-                          seek_head_.GetPosition(cluster_index));

-  seek_head_.SetSeekEntry(cluster_index, kMkvCluster,

-                          cues_.Size() + seek_head_.GetPosition(cues_index));

-}

-bool Segment::Init(IMkvWriter* ptr_writer) {

-  if (!ptr_writer) {

-    return false;

-  }

-  writer_cluster_ = ptr_writer;

-  writer_cues_ = ptr_writer;

-  writer_header_ = ptr_writer;

-  return segment_info_.Init();

-}

-bool Segment::CopyAndMoveCuesBeforeClusters(mkvparser::IMkvReader* reader,

-                                            IMkvWriter* writer) {

-  if (!writer->Seekable() || chunking_)

-    return false;

-  const int64 cluster_offset =

-      cluster_list_[0]->size_position() - GetUIntSize(kMkvCluster);

-  // Copy the headers.

-  if (!ChunkedCopy(reader, writer, 0, cluster_offset))

-    return false;

-  // Recompute cue positions and seek entries.

-  MoveCuesBeforeClusters();

-  // Write cues and seek entries.

-  // TODO(vigneshv): As of now, it's safe to call seek_head_.Finalize() for the

-  // second time with a different writer object. But the name Finalize() doesn't

-  // indicate something we want to call more than once. So consider renaming it

-  // to write() or some such.

-  if (!cues_.Write(writer) || !seek_head_.Finalize(writer))

-    return false;

-  // Copy the Clusters.

-  if (!ChunkedCopy(reader, writer, cluster_offset,

-                   cluster_end_offset_ - cluster_offset))

-    return false;

-  // Update the Segment size in case the Cues size has changed.

-  const int64 pos = writer->Position();

-  const int64 segment_size = writer->Position() - payload_pos_;

-  if (writer->Position(size_position_) ||

-      WriteUIntSize(writer, segment_size, 8) || writer->Position(pos))

-    return false;

-  return true;

-}

-bool Segment::Finalize() {

-  if (WriteFramesAll() < 0)

-    return false;

-  if (mode_ == kFile) {

-    if (cluster_list_size_ > 0) {

-      // Update last cluster's size

-      Cluster* const old_cluster = cluster_list_[cluster_list_size_ - 1];

-      if (!old_cluster || !old_cluster->Finalize())

-        return false;

-    }

-    if (chunking_ && chunk_writer_cluster_) {

-      chunk_writer_cluster_->Close();

-      chunk_count_++;

-    }

-    const double duration =

-        (static_cast<double>(last_timestamp_) + last_block_duration_) /

-        segment_info_.timecode_scale();

-    segment_info_.set_duration(duration);

-    if (!segment_info_.Finalize(writer_header_))

-      return false;

-    if (output_cues_)

-      if (!seek_head_.AddSeekEntry(kMkvCues, MaxOffset()))

-        return false;

-    if (chunking_) {

-      if (!chunk_writer_cues_)

-        return false;

-      char* name = NULL;

-      if (!UpdateChunkName("cues", &name))

-        return false;

-      const bool cues_open = chunk_writer_cues_->Open(name);

-      delete[] name;

-      if (!cues_open)

-        return false;

-    }

-    cluster_end_offset_ = writer_cluster_->Position();

-    // Write the seek headers and cues

-    if (output_cues_)

-      if (!cues_.Write(writer_cues_))

-        return false;

-    if (!seek_head_.Finalize(writer_header_))

-      return false;

-    if (writer_header_->Seekable()) {

-      if (size_position_ == -1)

-        return false;

-      const int64 segment_size = MaxOffset();

-      if (segment_size < 1)

-        return false;

-      const int64 pos = writer_header_->Position();

-      UpdateDocTypeVersion();

-      if (doc_type_version_ != doc_type_version_written_) {

-        if (writer_header_->Position(0))

-          return false;

-        if (!WriteEbmlHeader(writer_header_, doc_type_version_))

-          return false;

-        if (writer_header_->Position() != ebml_header_size_)

-          return false;

-        doc_type_version_written_ = doc_type_version_;

-      }

-      if (writer_header_->Position(size_position_))

-        return false;

-      if (WriteUIntSize(writer_header_, segment_size, 8))

-        return false;

-      if (writer_header_->Position(pos))

-        return false;

-    }

-    if (chunking_) {

-      // Do not close any writers until the segment size has been written,

-      // otherwise the size may be off.

-      if (!chunk_writer_cues_ || !chunk_writer_header_)

-        return false;

-      chunk_writer_cues_->Close();

-      chunk_writer_header_->Close();

-    }

-  }

-  return true;

-}

-Track* Segment::AddTrack(int32 number) {

-  Track* const track = new (std::nothrow) Track(&seed_);  // NOLINT

-  if (!track)

-    return NULL;

-  if (!tracks_.AddTrack(track, number)) {

-    delete track;

-    return NULL;

-  }

-  return track;

-}

-Chapter* Segment::AddChapter() { return chapters_.AddChapter(&seed_); }

-Tag* Segment::AddTag() { return tags_.AddTag(); }

-uint64 Segment::AddVideoTrack(int32 width, int32 height, int32 number) {

-  VideoTrack* const track = new (std::nothrow) VideoTrack(&seed_);  // NOLINT

-  if (!track)

-    return 0;

-  track->set_type(Tracks::kVideo);

-  track->set_codec_id(Tracks::kVp8CodecId);

-  track->set_width(width);

-  track->set_height(height);

-  tracks_.AddTrack(track, number);

-  has_video_ = true;

-  return track->number();

-}

-bool Segment::AddCuePoint(uint64 timestamp, uint64 track) {

-  if (cluster_list_size_ < 1)

-    return false;

-  const Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

-  if (!cluster)

-    return false;

-  CuePoint* const cue = new (std::nothrow) CuePoint();  // NOLINT

-  if (!cue)

-    return false;

-  cue->set_time(timestamp / segment_info_.timecode_scale());

-  cue->set_block_number(cluster->blocks_added());

-  cue->set_cluster_pos(cluster->position_for_cues());

-  cue->set_track(track);

-  if (!cues_.AddCue(cue))

-    return false;

-  new_cuepoint_ = false;

-  return true;

-}

-uint64 Segment::AddAudioTrack(int32 sample_rate, int32 channels, int32 number) {

-  AudioTrack* const track = new (std::nothrow) AudioTrack(&seed_);  // NOLINT

-  if (!track)

-    return 0;

-  track->set_type(Tracks::kAudio);

-  track->set_codec_id(Tracks::kVorbisCodecId);

-  track->set_sample_rate(sample_rate);

-  track->set_channels(channels);

-  tracks_.AddTrack(track, number);

-  return track->number();

-}

-bool Segment::AddFrame(const uint8* data, uint64 length, uint64 track_number,

-                       uint64 timestamp, bool is_key) {

-  if (!data)

-    return false;

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_track_number(track_number);

-  frame.set_timestamp(timestamp);

-  frame.set_is_key(is_key);

-  return AddGenericFrame(&frame);

-}

-bool Segment::AddFrameWithAdditional(const uint8* data, uint64 length,

-                                     const uint8* additional,

-                                     uint64 additional_length, uint64 add_id,

-                                     uint64 track_number, uint64 timestamp,

-                                     bool is_key) {

-  if (!data || !additional)

-    return false;

-  Frame frame;

-  if (!frame.Init(data, length) ||

-      !frame.AddAdditionalData(additional, additional_length, add_id)) {

-    return false;

-  }

-  frame.set_track_number(track_number);

-  frame.set_timestamp(timestamp);

-  frame.set_is_key(is_key);

-  return AddGenericFrame(&frame);

-}

-bool Segment::AddFrameWithDiscardPadding(const uint8* data, uint64 length,

-                                         int64 discard_padding,

-                                         uint64 track_number, uint64 timestamp,

-                                         bool is_key) {

-  if (!data)

-    return false;

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_discard_padding(discard_padding);

-  frame.set_track_number(track_number);

-  frame.set_timestamp(timestamp);

-  frame.set_is_key(is_key);

-  return AddGenericFrame(&frame);

-}

-bool Segment::AddMetadata(const uint8* data, uint64 length, uint64 track_number,

-                          uint64 timestamp_ns, uint64 duration_ns) {

-  if (!data)

-    return false;

-  Frame frame;

-  if (!frame.Init(data, length))

-    return false;

-  frame.set_track_number(track_number);

-  frame.set_timestamp(timestamp_ns);

-  frame.set_duration(duration_ns);

-  frame.set_is_key(true);  // All metadata blocks are keyframes.

-  return AddGenericFrame(&frame);

-}

-bool Segment::AddGenericFrame(const Frame* frame) {

-  if (!frame)

-    return false;

-  if (!CheckHeaderInfo())

-    return false;

-  // Check for non-monotonically increasing timestamps.

-  if (frame->timestamp() < last_timestamp_)

-    return false;

-  // Check if the track number is valid.

-  if (!tracks_.GetTrackByNumber(frame->track_number()))

-    return false;

-  if (frame->discard_padding() != 0)

-    doc_type_version_ = 4;

-  // If the segment has a video track hold onto audio frames to make sure the

-  // audio that is associated with the start time of a video key-frame is

-  // muxed into the same cluster.

-  if (has_video_ && tracks_.TrackIsAudio(frame->track_number()) &&

-      !force_new_cluster_) {

-    Frame* const new_frame = new (std::nothrow) Frame();

-    if (!new_frame || !new_frame->CopyFrom(*frame))

-      return false;

-    return QueueFrame(new_frame);

-  }

-  if (!DoNewClusterProcessing(frame->track_number(), frame->timestamp(),

-                              frame->is_key())) {

-    return false;

-  }

-  if (cluster_list_size_ < 1)

-    return false;

-  Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

-  if (!cluster)

-    return false;

-  // If the Frame is not a SimpleBlock, then set the reference_block_timestamp

-  // if it is not set already.

-  bool frame_created = false;

-  if (!frame->CanBeSimpleBlock() && !frame->is_key() &&

-      !frame->reference_block_timestamp_set()) {

-    Frame* const new_frame = new (std::nothrow) Frame();

-    if (!new_frame->CopyFrom(*frame))

-      return false;

-    new_frame->set_reference_block_timestamp(

-        last_track_timestamp_[frame->track_number() - 1]);

-    frame = new_frame;

-    frame_created = true;

-  }

-  if (!cluster->AddFrame(frame))

-    return false;

-  if (new_cuepoint_ && cues_track_ == frame->track_number()) {

-    if (!AddCuePoint(frame->timestamp(), cues_track_))

-      return false;

-  }

-  last_timestamp_ = frame->timestamp();

-  last_track_timestamp_[frame->track_number() - 1] = frame->timestamp();

-  last_block_duration_ = frame->duration();

-  if (frame_created)

-    delete frame;

-  return true;

-}

-void Segment::OutputCues(bool output_cues) { output_cues_ = output_cues; }

-bool Segment::SetChunking(bool chunking, const char* filename) {

-  if (chunk_count_ > 0)

-    return false;

-  if (chunking) {

-    if (!filename)

-      return false;

-    // Check if we are being set to what is already set.

-    if (chunking_ && !strcmp(filename, chunking_base_name_))

-      return true;

-    const size_t name_length = strlen(filename) + 1;

-    char* const temp = new (std::nothrow) char[name_length];  // NOLINT

-    if (!temp)

-      return false;

-#ifdef _MSC_VER

-    strcpy_s(temp, name_length, filename);

-#else

-    strcpy(temp, filename);

-#endif

-    delete[] chunking_base_name_;

-    chunking_base_name_ = temp;

-    if (!UpdateChunkName("chk", &chunk_name_))

-      return false;

-    if (!chunk_writer_cluster_) {

-      chunk_writer_cluster_ = new (std::nothrow) MkvWriter();  // NOLINT

-      if (!chunk_writer_cluster_)

-        return false;

-    }

-    if (!chunk_writer_cues_) {

-      chunk_writer_cues_ = new (std::nothrow) MkvWriter();  // NOLINT

-      if (!chunk_writer_cues_)

-        return false;

-    }

-    if (!chunk_writer_header_) {

-      chunk_writer_header_ = new (std::nothrow) MkvWriter();  // NOLINT

-      if (!chunk_writer_header_)

-        return false;

-    }

-    if (!chunk_writer_cluster_->Open(chunk_name_))

-      return false;

-    const size_t header_length = strlen(filename) + strlen(".hdr") + 1;

-    char* const header = new (std::nothrow) char[header_length];  // NOLINT

-    if (!header)

-      return false;

-#ifdef _MSC_VER

-    strcpy_s(header, header_length - strlen(".hdr"), chunking_base_name_);

-    strcat_s(header, header_length, ".hdr");

-#else

-    strcpy(header, chunking_base_name_);

-    strcat(header, ".hdr");

-#endif

-    if (!chunk_writer_header_->Open(header)) {

-      delete[] header;

-      return false;

-    }

-    writer_cluster_ = chunk_writer_cluster_;

-    writer_cues_ = chunk_writer_cues_;

-    writer_header_ = chunk_writer_header_;

-    delete[] header;

-  }

-  chunking_ = chunking;

-  return true;

-}

-bool Segment::CuesTrack(uint64 track_number) {

-  const Track* const track = GetTrackByNumber(track_number);

-  if (!track)

-    return false;

-  cues_track_ = track_number;

-  return true;

-}

-void Segment::ForceNewClusterOnNextFrame() { force_new_cluster_ = true; }

-Track* Segment::GetTrackByNumber(uint64 track_number) const {

-  return tracks_.GetTrackByNumber(track_number);

-}

-bool Segment::WriteSegmentHeader() {

-  UpdateDocTypeVersion();

-  // TODO(fgalligan): Support more than one segment.

-  if (!WriteEbmlHeader(writer_header_, doc_type_version_))

-    return false;

-  doc_type_version_written_ = doc_type_version_;

-  ebml_header_size_ = static_cast<int32>(writer_header_->Position());

-  // Write "unknown" (-1) as segment size value. If mode is kFile, Segment

-  // will write over duration when the file is finalized.

-  if (WriteID(writer_header_, kMkvSegment))

-    return false;

-  // Save for later.

-  size_position_ = writer_header_->Position();

-  // Write "unknown" (EBML coded -1) as segment size value. We need to write 8

-  // bytes because if we are going to overwrite the segment size later we do

-  // not know how big our segment will be.

-  if (SerializeInt(writer_header_, kEbmlUnknownValue, 8))

-    return false;

-  payload_pos_ = writer_header_->Position();

-  if (mode_ == kFile && writer_header_->Seekable()) {

-    // Set the duration > 0.0 so SegmentInfo will write out the duration. When

-    // the muxer is done writing we will set the correct duration and have

-    // SegmentInfo upadte it.

-    segment_info_.set_duration(1.0);

-    if (!seek_head_.Write(writer_header_))

-      return false;

-  }

-  if (!seek_head_.AddSeekEntry(kMkvInfo, MaxOffset()))

-    return false;

-  if (!segment_info_.Write(writer_header_))

-    return false;

-  if (!seek_head_.AddSeekEntry(kMkvTracks, MaxOffset()))

-    return false;

-  if (!tracks_.Write(writer_header_))

-    return false;

-  if (chapters_.Count() > 0) {

-    if (!seek_head_.AddSeekEntry(kMkvChapters, MaxOffset()))

-      return false;

-    if (!chapters_.Write(writer_header_))

-      return false;

-  }

-  if (tags_.Count() > 0) {

-    if (!seek_head_.AddSeekEntry(kMkvTags, MaxOffset()))

-      return false;

-    if (!tags_.Write(writer_header_))

-      return false;

-  }

-  if (chunking_ && (mode_ == kLive || !writer_header_->Seekable())) {

-    if (!chunk_writer_header_)

-      return false;

-    chunk_writer_header_->Close();

-  }

-  header_written_ = true;

-  return true;

-}

-// Here we are testing whether to create a new cluster, given a frame

-// having time frame_timestamp_ns.

-//

-int Segment::TestFrame(uint64 track_number, uint64 frame_timestamp_ns,

-                       bool is_key) const {

-  if (force_new_cluster_)

-    return 1;

-  // If no clusters have been created yet, then create a new cluster

-  // and write this frame immediately, in the new cluster.  This path

-  // should only be followed once, the first time we attempt to write

-  // a frame.

-  if (cluster_list_size_ <= 0)

-    return 1;

-  // There exists at least one cluster. We must compare the frame to

-  // the last cluster, in order to determine whether the frame is

-  // written to the existing cluster, or that a new cluster should be

-  // created.

-  const uint64 timecode_scale = segment_info_.timecode_scale();

-  const uint64 frame_timecode = frame_timestamp_ns / timecode_scale;

-  const Cluster* const last_cluster = cluster_list_[cluster_list_size_ - 1];

-  const uint64 last_cluster_timecode = last_cluster->timecode();

-  // For completeness we test for the case when the frame's timecode

-  // is less than the cluster's timecode.  Although in principle that

-  // is allowed, this muxer doesn't actually write clusters like that,

-  // so this indicates a bug somewhere in our algorithm.

-  if (frame_timecode < last_cluster_timecode)  // should never happen

-    return -1;

-  // If the frame has a timestamp significantly larger than the last

-  // cluster (in Matroska, cluster-relative timestamps are serialized

-  // using a 16-bit signed integer), then we cannot write this frame

-  // to that cluster, and so we must create a new cluster.

-  const int64 delta_timecode = frame_timecode - last_cluster_timecode;

-  if (delta_timecode > kMaxBlockTimecode)

-    return 2;

-  // We decide to create a new cluster when we have a video keyframe.

-  // This will flush queued (audio) frames, and write the keyframe

-  // immediately, in the newly-created cluster.

-  if (is_key && tracks_.TrackIsVideo(track_number))

-    return 1;

-  // Create a new cluster if we have accumulated too many frames

-  // already, where "too many" is defined as "the total time of frames

-  // in the cluster exceeds a threshold".

-  const uint64 delta_ns = delta_timecode * timecode_scale;

-  if (max_cluster_duration_ > 0 && delta_ns >= max_cluster_duration_)

-    return 1;

-  // This is similar to the case above, with the difference that a new

-  // cluster is created when the size of the current cluster exceeds a

-  // threshold.

-  const uint64 cluster_size = last_cluster->payload_size();

-  if (max_cluster_size_ > 0 && cluster_size >= max_cluster_size_)

-    return 1;

-  // There's no need to create a new cluster, so emit this frame now.

-  return 0;

-}

-bool Segment::MakeNewCluster(uint64 frame_timestamp_ns) {

-  const int32 new_size = cluster_list_size_ + 1;

-  if (new_size > cluster_list_capacity_) {

-    // Add more clusters.

-    const int32 new_capacity =

-        (cluster_list_capacity_ <= 0) ? 1 : cluster_list_capacity_ * 2;

-    Cluster** const clusters =

-        new (std::nothrow) Cluster*[new_capacity];  // NOLINT

-    if (!clusters)

-      return false;

-    for (int32 i = 0; i < cluster_list_size_; ++i) {

-      clusters[i] = cluster_list_[i];

-    }

-    delete[] cluster_list_;

-    cluster_list_ = clusters;

-    cluster_list_capacity_ = new_capacity;

-  }

-  if (!WriteFramesLessThan(frame_timestamp_ns))

-    return false;

-  if (mode_ == kFile) {

-    if (cluster_list_size_ > 0) {

-      // Update old cluster's size

-      Cluster* const old_cluster = cluster_list_[cluster_list_size_ - 1];

-      if (!old_cluster || !old_cluster->Finalize())

-        return false;

-    }

-    if (output_cues_)

-      new_cuepoint_ = true;

-  }

-  if (chunking_ && cluster_list_size_ > 0) {

-    chunk_writer_cluster_->Close();

-    chunk_count_++;

-    if (!UpdateChunkName("chk", &chunk_name_))

-      return false;

-    if (!chunk_writer_cluster_->Open(chunk_name_))

-      return false;

-  }

-  const uint64 timecode_scale = segment_info_.timecode_scale();

-  const uint64 frame_timecode = frame_timestamp_ns / timecode_scale;

-  uint64 cluster_timecode = frame_timecode;

-  if (frames_size_ > 0) {

-    const Frame* const f = frames_[0];  // earliest queued frame

-    const uint64 ns = f->timestamp();

-    const uint64 tc = ns / timecode_scale;

-    if (tc < cluster_timecode)

-      cluster_timecode = tc;

-  }

-  Cluster*& cluster = cluster_list_[cluster_list_size_];

-  const int64 offset = MaxOffset();

-  cluster = new (std::nothrow) Cluster(cluster_timecode,  // NOLINT

-                                       offset, segment_info_.timecode_scale());

-  if (!cluster)

-    return false;

-  if (!cluster->Init(writer_cluster_))

-    return false;

-  cluster_list_size_ = new_size;

-  return true;

-}

-bool Segment::DoNewClusterProcessing(uint64 track_number,

-                                     uint64 frame_timestamp_ns, bool is_key) {

-  for (;;) {

-    // Based on the characteristics of the current frame and current

-    // cluster, decide whether to create a new cluster.

-    const int result = TestFrame(track_number, frame_timestamp_ns, is_key);

-    if (result < 0)  // error

-      return false;

-    // Always set force_new_cluster_ to false after TestFrame.

-    force_new_cluster_ = false;

-    // A non-zero result means create a new cluster.

-    if (result > 0 && !MakeNewCluster(frame_timestamp_ns))

-      return false;

-    // Write queued (audio) frames.

-    const int frame_count = WriteFramesAll();

-    if (frame_count < 0)  // error

-      return false;

-    // Write the current frame to the current cluster (if TestFrame

-    // returns 0) or to a newly created cluster (TestFrame returns 1).

-    if (result <= 1)

-      return true;

-    // TestFrame returned 2, which means there was a large time

-    // difference between the cluster and the frame itself.  Do the

-    // test again, comparing the frame to the new cluster.

-  }

-}

-bool Segment::CheckHeaderInfo() {

-  if (!header_written_) {

-    if (!WriteSegmentHeader())

-      return false;

-    if (!seek_head_.AddSeekEntry(kMkvCluster, MaxOffset()))

-      return false;

-    if (output_cues_ && cues_track_ == 0) {

-      // Check for a video track

-      for (uint32 i = 0; i < tracks_.track_entries_size(); ++i) {

-        const Track* const track = tracks_.GetTrackByIndex(i);

-        if (!track)

-          return false;

-        if (tracks_.TrackIsVideo(track->number())) {

-          cues_track_ = track->number();

-          break;

-        }

-      }

-      // Set first track found

-      if (cues_track_ == 0) {

-        const Track* const track = tracks_.GetTrackByIndex(0);

-        if (!track)

-          return false;

-        cues_track_ = track->number();

-      }

-    }

-  }

-  return true;

-}

-void Segment::UpdateDocTypeVersion() {

-  for (uint32 index = 0; index < tracks_.track_entries_size(); ++index) {

-    const Track* track = tracks_.GetTrackByIndex(index);

-    if (track == NULL)

-      break;

-    if ((track->codec_delay() || track->seek_pre_roll()) &&

-        doc_type_version_ < 4) {

-      doc_type_version_ = 4;

-      break;

-    }

-  }

-}

-bool Segment::UpdateChunkName(const char* ext, char** name) const {

-  if (!name || !ext)

-    return false;

-  char ext_chk[64];

-#ifdef _MSC_VER

-  sprintf_s(ext_chk, sizeof(ext_chk), "_%06d.%s", chunk_count_, ext);

-#else

-  snprintf(ext_chk, sizeof(ext_chk), "_%06d.%s", chunk_count_, ext);

-#endif

-  const size_t length = strlen(chunking_base_name_) + strlen(ext_chk) + 1;

-  char* const str = new (std::nothrow) char[length];  // NOLINT

-  if (!str)

-    return false;

-#ifdef _MSC_VER

-  strcpy_s(str, length - strlen(ext_chk), chunking_base_name_);

-  strcat_s(str, length, ext_chk);

-#else

-  strcpy(str, chunking_base_name_);

-  strcat(str, ext_chk);

-#endif

-  delete[] * name;

-  *name = str;

-  return true;

-}

-int64 Segment::MaxOffset() {

-  if (!writer_header_)

-    return -1;

-  int64 offset = writer_header_->Position() - payload_pos_;

-  if (chunking_) {

-    for (int32 i = 0; i < cluster_list_size_; ++i) {

-      Cluster* const cluster = cluster_list_[i];

-      offset += cluster->Size();

-    }

-    if (writer_cues_)

-      offset += writer_cues_->Position();

-  }

-  return offset;

-}

-bool Segment::QueueFrame(Frame* frame) {

-  const int32 new_size = frames_size_ + 1;

-  if (new_size > frames_capacity_) {

-    // Add more frames.

-    const int32 new_capacity = (!frames_capacity_) ? 2 : frames_capacity_ * 2;

-    if (new_capacity < 1)

-      return false;

-    Frame** const frames = new (std::nothrow) Frame*[new_capacity];  // NOLINT

-    if (!frames)

-      return false;

-    for (int32 i = 0; i < frames_size_; ++i) {

-      frames[i] = frames_[i];

-    }

-    delete[] frames_;

-    frames_ = frames;

-    frames_capacity_ = new_capacity;

-  }

-  frames_[frames_size_++] = frame;

-  return true;

-}

-int Segment::WriteFramesAll() {

-  if (frames_ == NULL)

-    return 0;

-  if (cluster_list_size_ < 1)

-    return -1;

-  Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

-  if (!cluster)

-    return -1;

-  for (int32 i = 0; i < frames_size_; ++i) {

-    Frame*& frame = frames_[i];

-    // TODO(jzern/vigneshv): using Segment::AddGenericFrame here would limit the

-    // places where |doc_type_version_| needs to be updated.

-    if (frame->discard_padding() != 0)

-      doc_type_version_ = 4;

-    if (!cluster->AddFrame(frame))

-      return -1;

-    if (new_cuepoint_ && cues_track_ == frame->track_number()) {

-      if (!AddCuePoint(frame->timestamp(), cues_track_))

-        return -1;

-    }

-    if (frame->timestamp() > last_timestamp_) {

-      last_timestamp_ = frame->timestamp();

-      last_track_timestamp_[frame->track_number() - 1] = frame->timestamp();

-    }

-    delete frame;

-    frame = NULL;

-  }

-  const int result = frames_size_;

-  frames_size_ = 0;

-  return result;

-}

-bool Segment::WriteFramesLessThan(uint64 timestamp) {

-  // Check |cluster_list_size_| to see if this is the first cluster. If it is

-  // the first cluster the audio frames that are less than the first video

-  // timesatmp will be written in a later step.

-  if (frames_size_ > 0 && cluster_list_size_ > 0) {

-    if (!frames_)

-      return false;

-    Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

-    if (!cluster)

-      return false;

-    int32 shift_left = 0;

-    // TODO(fgalligan): Change this to use the durations of frames instead of

-    // the next frame's start time if the duration is accurate.

-    for (int32 i = 1; i < frames_size_; ++i) {

-      const Frame* const frame_curr = frames_[i];

-      if (frame_curr->timestamp() > timestamp)

-        break;

-      const Frame* const frame_prev = frames_[i - 1];

-      if (frame_prev->discard_padding() != 0)

-        doc_type_version_ = 4;

-      if (!cluster->AddFrame(frame_prev))

-        return false;

-      if (new_cuepoint_ && cues_track_ == frame_prev->track_number()) {

-        if (!AddCuePoint(frame_prev->timestamp(), cues_track_))

-          return false;

-      }

-      ++shift_left;

-      if (frame_prev->timestamp() > last_timestamp_) {

-        last_timestamp_ = frame_prev->timestamp();

-        last_track_timestamp_[frame_prev->track_number() - 1] =

-            frame_prev->timestamp();

-      }

-      delete frame_prev;

-    }

-    if (shift_left > 0) {

-      if (shift_left >= frames_size_)

-        return false;

-      const int32 new_frames_size = frames_size_ - shift_left;

-      for (int32 i = 0; i < new_frames_size; ++i) {

-        frames_[i] = frames_[i + shift_left];

-      }

-      frames_size_ = new_frames_size;

-    }

-  }

-  return true;

-}

-}  // namespace mkvmuxer

--- a/third_party/libwebm/mkvmuxer.hpp

+++ /dev/null

@@ -1,1492 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVMUXER_HPP

-#define MKVMUXER_HPP

-#include "mkvmuxertypes.hpp"

-// For a description of the WebM elements see

-// http://www.webmproject.org/code/specs/container/.

-namespace mkvparser {

-class IMkvReader;

-}  // end namespace

-namespace mkvmuxer {

-class MkvWriter;

-class Segment;

-const uint64 kMaxTrackNumber = 126;

-///////////////////////////////////////////////////////////////

-// Interface used by the mkvmuxer to write out the Mkv data.

-class IMkvWriter {

- public:

-  // Writes out |len| bytes of |buf|. Returns 0 on success.

-  virtual int32 Write(const void* buf, uint32 len) = 0;

-  // Returns the offset of the output position from the beginning of the

-  // output.

-  virtual int64 Position() const = 0;

-  // Set the current File position. Returns 0 on success.

-  virtual int32 Position(int64 position) = 0;

-  // Returns true if the writer is seekable.

-  virtual bool Seekable() const = 0;

-  // Element start notification. Called whenever an element identifier is about

-  // to be written to the stream. |element_id| is the element identifier, and

-  // |position| is the location in the WebM stream where the first octet of the

-  // element identifier will be written.

-  // Note: the |MkvId| enumeration in webmids.hpp defines element values.

-  virtual void ElementStartNotify(uint64 element_id, int64 position) = 0;

- protected:

-  IMkvWriter();

-  virtual ~IMkvWriter();

- private:

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(IMkvWriter);

-};

-// Writes out the EBML header for a WebM file. This function must be called

-// before any other libwebm writing functions are called.

-bool WriteEbmlHeader(IMkvWriter* writer, uint64 doc_type_version);

-// Deprecated. Writes out EBML header with doc_type_version as

-// kDefaultDocTypeVersion. Exists for backward compatibility.

-bool WriteEbmlHeader(IMkvWriter* writer);

-// Copies in Chunk from source to destination between the given byte positions

-bool ChunkedCopy(mkvparser::IMkvReader* source, IMkvWriter* dst, int64 start,

-                 int64 size);

-///////////////////////////////////////////////////////////////

-// Class to hold data the will be written to a block.

-class Frame {

- public:

-  Frame();

-  ~Frame();

-  // Sets this frame's contents based on |frame|. Returns true on success. On

-  // failure, this frame's existing contents may be lost.

-  bool CopyFrom(const Frame& frame);

-  // Copies |frame| data into |frame_|. Returns true on success.

-  bool Init(const uint8* frame, uint64 length);

-  // Copies |additional| data into |additional_|. Returns true on success.

-  bool AddAdditionalData(const uint8* additional, uint64 length, uint64 add_id);

-  // Returns true if the frame has valid parameters.

-  bool IsValid() const;

-  // Returns true if the frame can be written as a SimpleBlock based on current

-  // parameters.

-  bool CanBeSimpleBlock() const;

-  uint64 add_id() const { return add_id_; }

-  const uint8* additional() const { return additional_; }

-  uint64 additional_length() const { return additional_length_; }

-  void set_duration(uint64 duration) { duration_ = duration; }

-  uint64 duration() const { return duration_; }

-  const uint8* frame() const { return frame_; }

-  void set_is_key(bool key) { is_key_ = key; }

-  bool is_key() const { return is_key_; }

-  uint64 length() const { return length_; }

-  void set_track_number(uint64 track_number) { track_number_ = track_number; }

-  uint64 track_number() const { return track_number_; }

-  void set_timestamp(uint64 timestamp) { timestamp_ = timestamp; }

-  uint64 timestamp() const { return timestamp_; }

-  void set_discard_padding(int64 discard_padding) {

-    discard_padding_ = discard_padding;

-  }

-  int64 discard_padding() const { return discard_padding_; }

-  void set_reference_block_timestamp(int64 reference_block_timestamp);

-  int64 reference_block_timestamp() const { return reference_block_timestamp_; }

-  bool reference_block_timestamp_set() const {

-    return reference_block_timestamp_set_;

-  }

- private:

-  // Id of the Additional data.

-  uint64 add_id_;

-  // Pointer to additional data. Owned by this class.

-  uint8* additional_;

-  // Length of the additional data.

-  uint64 additional_length_;

-  // Duration of the frame in nanoseconds.

-  uint64 duration_;

-  // Pointer to the data. Owned by this class.

-  uint8* frame_;

-  // Flag telling if the data should set the key flag of a block.

-  bool is_key_;

-  // Length of the data.

-  uint64 length_;

-  // Mkv track number the data is associated with.

-  uint64 track_number_;

-  // Timestamp of the data in nanoseconds.

-  uint64 timestamp_;

-  // Discard padding for the frame.

-  int64 discard_padding_;

-  // Reference block timestamp.

-  int64 reference_block_timestamp_;

-  // Flag indicating if |reference_block_timestamp_| has been set.

-  bool reference_block_timestamp_set_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Frame);

-};

-///////////////////////////////////////////////////////////////

-// Class to hold one cue point in a Cues element.

-class CuePoint {

- public:

-  CuePoint();

-  ~CuePoint();

-  // Returns the size in bytes for the entire CuePoint element.

-  uint64 Size() const;

-  // Output the CuePoint element to the writer. Returns true on success.

-  bool Write(IMkvWriter* writer) const;

-  void set_time(uint64 time) { time_ = time; }

-  uint64 time() const { return time_; }

-  void set_track(uint64 track) { track_ = track; }

-  uint64 track() const { return track_; }

-  void set_cluster_pos(uint64 cluster_pos) { cluster_pos_ = cluster_pos; }

-  uint64 cluster_pos() const { return cluster_pos_; }

-  void set_block_number(uint64 block_number) { block_number_ = block_number; }

-  uint64 block_number() const { return block_number_; }

-  void set_output_block_number(bool output_block_number) {

-    output_block_number_ = output_block_number;

-  }

-  bool output_block_number() const { return output_block_number_; }

- private:

-  // Returns the size in bytes for the payload of the CuePoint element.

-  uint64 PayloadSize() const;

-  // Absolute timecode according to the segment time base.

-  uint64 time_;

-  // The Track element associated with the CuePoint.

-  uint64 track_;

-  // The position of the Cluster containing the Block.

-  uint64 cluster_pos_;

-  // Number of the Block within the Cluster, starting from 1.

-  uint64 block_number_;

-  // If true the muxer will write out the block number for the cue if the

-  // block number is different than the default of 1. Default is set to true.

-  bool output_block_number_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(CuePoint);

-};

-///////////////////////////////////////////////////////////////

-// Cues element.

-class Cues {

- public:

-  Cues();

-  ~Cues();

-  // Adds a cue point to the Cues element. Returns true on success.

-  bool AddCue(CuePoint* cue);

-  // Returns the cue point by index. Returns NULL if there is no cue point

-  // match.

-  CuePoint* GetCueByIndex(int32 index) const;

-  // Returns the total size of the Cues element

-  uint64 Size();

-  // Output the Cues element to the writer. Returns true on success.

-  bool Write(IMkvWriter* writer) const;

-  int32 cue_entries_size() const { return cue_entries_size_; }

-  void set_output_block_number(bool output_block_number) {

-    output_block_number_ = output_block_number;

-  }

-  bool output_block_number() const { return output_block_number_; }

- private:

-  // Number of allocated elements in |cue_entries_|.

-  int32 cue_entries_capacity_;

-  // Number of CuePoints in |cue_entries_|.

-  int32 cue_entries_size_;

-  // CuePoint list.

-  CuePoint** cue_entries_;

-  // If true the muxer will write out the block number for the cue if the

-  // block number is different than the default of 1. Default is set to true.

-  bool output_block_number_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Cues);

-};

-///////////////////////////////////////////////////////////////

-// ContentEncAESSettings element

-class ContentEncAESSettings {

- public:

-  enum { kCTR = 1 };

-  ContentEncAESSettings();

-  ~ContentEncAESSettings() {}

-  // Returns the size in bytes for the ContentEncAESSettings element.

-  uint64 Size() const;

-  // Writes out the ContentEncAESSettings element to |writer|. Returns true on

-  // success.

-  bool Write(IMkvWriter* writer) const;

-  uint64 cipher_mode() const { return cipher_mode_; }

- private:

-  // Returns the size in bytes for the payload of the ContentEncAESSettings

-  // element.

-  uint64 PayloadSize() const;

-  // Sub elements

-  uint64 cipher_mode_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncAESSettings);

-};

-///////////////////////////////////////////////////////////////

-// ContentEncoding element

-// Elements used to describe if the track data has been encrypted or

-// compressed with zlib or header stripping.

-// Currently only whole frames can be encrypted with AES. This dictates that

-// ContentEncodingOrder will be 0, ContentEncodingScope will be 1,

-// ContentEncodingType will be 1, and ContentEncAlgo will be 5.

-class ContentEncoding {

- public:

-  ContentEncoding();

-  ~ContentEncoding();

-  // Sets the content encryption id. Copies |length| bytes from |id| to

-  // |enc_key_id_|. Returns true on success.

-  bool SetEncryptionID(const uint8* id, uint64 length);

-  // Returns the size in bytes for the ContentEncoding element.

-  uint64 Size() const;

-  // Writes out the ContentEncoding element to |writer|. Returns true on

-  // success.

-  bool Write(IMkvWriter* writer) const;

-  uint64 enc_algo() const { return enc_algo_; }

-  uint64 encoding_order() const { return encoding_order_; }

-  uint64 encoding_scope() const { return encoding_scope_; }

-  uint64 encoding_type() const { return encoding_type_; }

-  ContentEncAESSettings* enc_aes_settings() { return &enc_aes_settings_; }

- private:

-  // Returns the size in bytes for the encoding elements.

-  uint64 EncodingSize(uint64 compresion_size, uint64 encryption_size) const;

-  // Returns the size in bytes for the encryption elements.

-  uint64 EncryptionSize() const;

-  // Track element names

-  uint64 enc_algo_;

-  uint8* enc_key_id_;

-  uint64 encoding_order_;

-  uint64 encoding_scope_;

-  uint64 encoding_type_;

-  // ContentEncAESSettings element.

-  ContentEncAESSettings enc_aes_settings_;

-  // Size of the ContentEncKeyID data in bytes.

-  uint64 enc_key_id_length_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncoding);

-};

-///////////////////////////////////////////////////////////////

-// Track element.

-class Track {

- public:

-  // The |seed| parameter is used to synthesize a UID for the track.

-  explicit Track(unsigned int* seed);

-  virtual ~Track();

-  // Adds a ContentEncoding element to the Track. Returns true on success.

-  virtual bool AddContentEncoding();

-  // Returns the ContentEncoding by index. Returns NULL if there is no

-  // ContentEncoding match.

-  ContentEncoding* GetContentEncodingByIndex(uint32 index) const;

-  // Returns the size in bytes for the payload of the Track element.

-  virtual uint64 PayloadSize() const;

-  // Returns the size in bytes of the Track element.

-  virtual uint64 Size() const;

-  // Output the Track element to the writer. Returns true on success.

-  virtual bool Write(IMkvWriter* writer) const;

-  // Sets the CodecPrivate element of the Track element. Copies |length|

-  // bytes from |codec_private| to |codec_private_|. Returns true on success.

-  bool SetCodecPrivate(const uint8* codec_private, uint64 length);

-  void set_codec_id(const char* codec_id);

-  const char* codec_id() const { return codec_id_; }

-  const uint8* codec_private() const { return codec_private_; }

-  void set_language(const char* language);

-  const char* language() const { return language_; }

-  void set_max_block_additional_id(uint64 max_block_additional_id) {

-    max_block_additional_id_ = max_block_additional_id;

-  }

-  uint64 max_block_additional_id() const { return max_block_additional_id_; }

-  void set_name(const char* name);

-  const char* name() const { return name_; }

-  void set_number(uint64 number) { number_ = number; }

-  uint64 number() const { return number_; }

-  void set_type(uint64 type) { type_ = type; }

-  uint64 type() const { return type_; }

-  void set_uid(uint64 uid) { uid_ = uid; }

-  uint64 uid() const { return uid_; }

-  void set_codec_delay(uint64 codec_delay) { codec_delay_ = codec_delay; }

-  uint64 codec_delay() const { return codec_delay_; }

-  void set_seek_pre_roll(uint64 seek_pre_roll) {

-    seek_pre_roll_ = seek_pre_roll;

-  }

-  uint64 seek_pre_roll() const { return seek_pre_roll_; }

-  void set_default_duration(uint64 default_duration) {

-    default_duration_ = default_duration;

-  }

-  uint64 default_duration() const { return default_duration_; }

-  uint64 codec_private_length() const { return codec_private_length_; }

-  uint32 content_encoding_entries_size() const {

-    return content_encoding_entries_size_;

-  }

- private:

-  // Track element names.

-  char* codec_id_;

-  uint8* codec_private_;

-  char* language_;

-  uint64 max_block_additional_id_;

-  char* name_;

-  uint64 number_;

-  uint64 type_;

-  uint64 uid_;

-  uint64 codec_delay_;

-  uint64 seek_pre_roll_;

-  uint64 default_duration_;

-  // Size of the CodecPrivate data in bytes.

-  uint64 codec_private_length_;

-  // ContentEncoding element list.

-  ContentEncoding** content_encoding_entries_;

-  // Number of ContentEncoding elements added.

-  uint32 content_encoding_entries_size_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Track);

-};

-///////////////////////////////////////////////////////////////

-// Track that has video specific elements.

-class VideoTrack : public Track {

- public:

-  // Supported modes for stereo 3D.

-  enum StereoMode {

-    kMono = 0,

-    kSideBySideLeftIsFirst = 1,

-    kTopBottomRightIsFirst = 2,

-    kTopBottomLeftIsFirst = 3,

-    kSideBySideRightIsFirst = 11

-  };

-  enum AlphaMode { kNoAlpha = 0, kAlpha = 1 };

-  // The |seed| parameter is used to synthesize a UID for the track.

-  explicit VideoTrack(unsigned int* seed);

-  virtual ~VideoTrack();

-  // Returns the size in bytes for the payload of the Track element plus the

-  // video specific elements.

-  virtual uint64 PayloadSize() const;

-  // Output the VideoTrack element to the writer. Returns true on success.

-  virtual bool Write(IMkvWriter* writer) const;

-  // Sets the video's stereo mode. Returns true on success.

-  bool SetStereoMode(uint64 stereo_mode);

-  // Sets the video's alpha mode. Returns true on success.

-  bool SetAlphaMode(uint64 alpha_mode);

-  void set_display_height(uint64 height) { display_height_ = height; }

-  uint64 display_height() const { return display_height_; }

-  void set_display_width(uint64 width) { display_width_ = width; }

-  uint64 display_width() const { return display_width_; }

-  void set_crop_left(uint64 crop_left) { crop_left_ = crop_left; }

-  uint64 crop_left() const { return crop_left_; }

-  void set_crop_right(uint64 crop_right) { crop_right_ = crop_right; }

-  uint64 crop_right() const { return crop_right_; }

-  void set_crop_top(uint64 crop_top) { crop_top_ = crop_top; }

-  uint64 crop_top() const { return crop_top_; }

-  void set_crop_bottom(uint64 crop_bottom) { crop_bottom_ = crop_bottom; }

-  uint64 crop_bottom() const { return crop_bottom_; }

-  void set_frame_rate(double frame_rate) { frame_rate_ = frame_rate; }

-  double frame_rate() const { return frame_rate_; }

-  void set_height(uint64 height) { height_ = height; }

-  uint64 height() const { return height_; }

-  uint64 stereo_mode() { return stereo_mode_; }

-  uint64 alpha_mode() { return alpha_mode_; }

-  void set_width(uint64 width) { width_ = width; }

-  uint64 width() const { return width_; }

- private:

-  // Returns the size in bytes of the Video element.

-  uint64 VideoPayloadSize() const;

-  // Video track element names.

-  uint64 display_height_;

-  uint64 display_width_;

-  uint64 crop_left_;

-  uint64 crop_right_;

-  uint64 crop_top_;

-  uint64 crop_bottom_;

-  double frame_rate_;

-  uint64 height_;

-  uint64 stereo_mode_;

-  uint64 alpha_mode_;

-  uint64 width_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(VideoTrack);

-};

-///////////////////////////////////////////////////////////////

-// Track that has audio specific elements.

-class AudioTrack : public Track {

- public:

-  // The |seed| parameter is used to synthesize a UID for the track.

-  explicit AudioTrack(unsigned int* seed);

-  virtual ~AudioTrack();

-  // Returns the size in bytes for the payload of the Track element plus the

-  // audio specific elements.

-  virtual uint64 PayloadSize() const;

-  // Output the AudioTrack element to the writer. Returns true on success.

-  virtual bool Write(IMkvWriter* writer) const;

-  void set_bit_depth(uint64 bit_depth) { bit_depth_ = bit_depth; }

-  uint64 bit_depth() const { return bit_depth_; }

-  void set_channels(uint64 channels) { channels_ = channels; }

-  uint64 channels() const { return channels_; }

-  void set_sample_rate(double sample_rate) { sample_rate_ = sample_rate; }

-  double sample_rate() const { return sample_rate_; }

- private:

-  // Audio track element names.

-  uint64 bit_depth_;

-  uint64 channels_;

-  double sample_rate_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(AudioTrack);

-};

-///////////////////////////////////////////////////////////////

-// Tracks element

-class Tracks {

- public:

-  // Audio and video type defined by the Matroska specs.

-  enum { kVideo = 0x1, kAudio = 0x2 };

-  static const char kOpusCodecId[];

-  static const char kVorbisCodecId[];

-  static const char kVp8CodecId[];

-  static const char kVp9CodecId[];

-  static const char kVp10CodecId[];

-  Tracks();

-  ~Tracks();

-  // Adds a Track element to the Tracks object. |track| will be owned and

-  // deleted by the Tracks object. Returns true on success. |number| is the

-  // number to use for the track. |number| must be >= 0. If |number| == 0

-  // then the muxer will decide on the track number.

-  bool AddTrack(Track* track, int32 number);

-  // Returns the track by index. Returns NULL if there is no track match.

-  const Track* GetTrackByIndex(uint32 idx) const;

-  // Search the Tracks and return the track that matches |tn|. Returns NULL

-  // if there is no track match.

-  Track* GetTrackByNumber(uint64 track_number) const;

-  // Returns true if the track number is an audio track.

-  bool TrackIsAudio(uint64 track_number) const;

-  // Returns true if the track number is a video track.

-  bool TrackIsVideo(uint64 track_number) const;

-  // Output the Tracks element to the writer. Returns true on success.

-  bool Write(IMkvWriter* writer) const;

-  uint32 track_entries_size() const { return track_entries_size_; }

- private:

-  // Track element list.

-  Track** track_entries_;

-  // Number of Track elements added.

-  uint32 track_entries_size_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tracks);

-};

-///////////////////////////////////////////////////////////////

-// Chapter element

-//

-class Chapter {

- public:

-  // Set the identifier for this chapter.  (This corresponds to the

-  // Cue Identifier line in WebVTT.)

-  // TODO(matthewjheaney): the actual serialization of this item in

-  // MKV is pending.

-  bool set_id(const char* id);

-  // Converts the nanosecond start and stop times of this chapter to

-  // their corresponding timecode values, and stores them that way.

-  void set_time(const Segment& segment, uint64 start_time_ns,

-                uint64 end_time_ns);

-  // Sets the uid for this chapter. Primarily used to enable

-  // deterministic output from the muxer.

-  void set_uid(const uint64 uid) { uid_ = uid; }

-  // Add a title string to this chapter, per the semantics described

-  // here:

-  //  http://www.matroska.org/technical/specs/index.html

-  //

-  // The title ("chapter string") is a UTF-8 string.

-  //

-  // The language has ISO 639-2 representation, described here:

-  //  http://www.loc.gov/standards/iso639-2/englangn.html

-  //  http://www.loc.gov/standards/iso639-2/php/English_list.php

-  // If you specify NULL as the language value, this implies

-  // English ("eng").

-  //

-  // The country value corresponds to the codes listed here:

-  //  http://www.iana.org/domains/root/db/

-  //

-  // The function returns false if the string could not be allocated.

-  bool add_string(const char* title, const char* language, const char* country);

- private:

-  friend class Chapters;

-  // For storage of chapter titles that differ by language.

-  class Display {

-   public:

-    // Establish representation invariant for new Display object.

-    void Init();

-    // Reclaim resources, in anticipation of destruction.

-    void Clear();

-    // Copies the title to the |title_| member.  Returns false on

-    // error.

-    bool set_title(const char* title);

-    // Copies the language to the |language_| member.  Returns false

-    // on error.

-    bool set_language(const char* language);

-    // Copies the country to the |country_| member.  Returns false on

-    // error.

-    bool set_country(const char* country);

-    // If |writer| is non-NULL, serialize the Display sub-element of

-    // the Atom into the stream.  Returns the Display element size on

-    // success, 0 if error.

-    uint64 WriteDisplay(IMkvWriter* writer) const;

-   private:

-    char* title_;

-    char* language_;

-    char* country_;

-  };

-  Chapter();

-  ~Chapter();

-  // Establish the representation invariant for a newly-created

-  // Chapter object.  The |seed| parameter is used to create the UID

-  // for this chapter atom.

-  void Init(unsigned int* seed);

-  // Copies this Chapter object to a different one.  This is used when

-  // expanding a plain array of Chapter objects (see Chapters).

-  void ShallowCopy(Chapter* dst) const;

-  // Reclaim resources used by this Chapter object, pending its

-  // destruction.

-  void Clear();

-  // If there is no storage remaining on the |displays_| array for a

-  // new display object, creates a new, longer array and copies the

-  // existing Display objects to the new array.  Returns false if the

-  // array cannot be expanded.

-  bool ExpandDisplaysArray();

-  // If |writer| is non-NULL, serialize the Atom sub-element into the

-  // stream.  Returns the total size of the element on success, 0 if

-  // error.

-  uint64 WriteAtom(IMkvWriter* writer) const;

-  // The string identifier for this chapter (corresponds to WebVTT cue

-  // identifier).

-  char* id_;

-  // Start timecode of the chapter.

-  uint64 start_timecode_;

-  // Stop timecode of the chapter.

-  uint64 end_timecode_;

-  // The binary identifier for this chapter.

-  uint64 uid_;

-  // The Atom element can contain multiple Display sub-elements, as

-  // the same logical title can be rendered in different languages.

-  Display* displays_;

-  // The physical length (total size) of the |displays_| array.

-  int displays_size_;

-  // The logical length (number of active elements) on the |displays_|

-  // array.

-  int displays_count_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Chapter);

-};

-///////////////////////////////////////////////////////////////

-// Chapters element

-//

-class Chapters {

- public:

-  Chapters();

-  ~Chapters();

-  Chapter* AddChapter(unsigned int* seed);

-  // Returns the number of chapters that have been added.

-  int Count() const;

-  // Output the Chapters element to the writer. Returns true on success.

-  bool Write(IMkvWriter* writer) const;

- private:

-  // Expands the chapters_ array if there is not enough space to contain

-  // another chapter object.  Returns true on success.

-  bool ExpandChaptersArray();

-  // If |writer| is non-NULL, serialize the Edition sub-element of the

-  // Chapters element into the stream.  Returns the Edition element

-  // size on success, 0 if error.

-  uint64 WriteEdition(IMkvWriter* writer) const;

-  // Total length of the chapters_ array.

-  int chapters_size_;

-  // Number of active chapters on the chapters_ array.

-  int chapters_count_;

-  // Array for storage of chapter objects.

-  Chapter* chapters_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Chapters);

-};

-///////////////////////////////////////////////////////////////

-// Tag element

-//

-class Tag {

- public:

-  bool add_simple_tag(const char* tag_name, const char* tag_string);

- private:

-  // Tags calls Clear and the destructor of Tag

-  friend class Tags;

-  // For storage of simple tags

-  class SimpleTag {

-   public:

-    // Establish representation invariant for new SimpleTag object.

-    void Init();

-    // Reclaim resources, in anticipation of destruction.

-    void Clear();

-    // Copies the title to the |tag_name_| member.  Returns false on

-    // error.

-    bool set_tag_name(const char* tag_name);

-    // Copies the language to the |tag_string_| member.  Returns false

-    // on error.

-    bool set_tag_string(const char* tag_string);

-    // If |writer| is non-NULL, serialize the SimpleTag sub-element of

-    // the Atom into the stream.  Returns the SimpleTag element size on

-    // success, 0 if error.

-    uint64 Write(IMkvWriter* writer) const;

-   private:

-    char* tag_name_;

-    char* tag_string_;

-  };

-  Tag();

-  ~Tag();

-  // Copies this Tag object to a different one.  This is used when

-  // expanding a plain array of Tag objects (see Tags).

-  void ShallowCopy(Tag* dst) const;

-  // Reclaim resources used by this Tag object, pending its

-  // destruction.

-  void Clear();

-  // If there is no storage remaining on the |simple_tags_| array for a

-  // new display object, creates a new, longer array and copies the

-  // existing SimpleTag objects to the new array.  Returns false if the

-  // array cannot be expanded.

-  bool ExpandSimpleTagsArray();

-  // If |writer| is non-NULL, serialize the Tag sub-element into the

-  // stream.  Returns the total size of the element on success, 0 if

-  // error.

-  uint64 Write(IMkvWriter* writer) const;

-  // The Atom element can contain multiple SimpleTag sub-elements

-  SimpleTag* simple_tags_;

-  // The physical length (total size) of the |simple_tags_| array.

-  int simple_tags_size_;

-  // The logical length (number of active elements) on the |simple_tags_|

-  // array.

-  int simple_tags_count_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tag);

-};

-///////////////////////////////////////////////////////////////

-// Tags element

-//

-class Tags {

- public:

-  Tags();

-  ~Tags();

-  Tag* AddTag();

-  // Returns the number of tags that have been added.

-  int Count() const;

-  // Output the Tags element to the writer. Returns true on success.

-  bool Write(IMkvWriter* writer) const;

- private:

-  // Expands the tags_ array if there is not enough space to contain

-  // another tag object.  Returns true on success.

-  bool ExpandTagsArray();

-  // Total length of the tags_ array.

-  int tags_size_;

-  // Number of active tags on the tags_ array.

-  int tags_count_;

-  // Array for storage of tag objects.

-  Tag* tags_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tags);

-};

-///////////////////////////////////////////////////////////////

-// Cluster element

-//

-// Notes:

-//  |Init| must be called before any other method in this class.

-class Cluster {

- public:

-  // |timecode| is the absolute timecode of the cluster. |cues_pos| is the

-  // position for the cluster within the segment that should be written in

-  // the cues element. |timecode_scale| is the timecode scale of the segment.

-  Cluster(uint64 timecode, int64 cues_pos, uint64 timecode_scale);

-  ~Cluster();

-  bool Init(IMkvWriter* ptr_writer);

-  // Adds a frame to be output in the file. The frame is written out through

-  // |writer_| if successful. Returns true on success.

-  bool AddFrame(const Frame* frame);

-  // Adds a frame to be output in the file. The frame is written out through

-  // |writer_| if successful. Returns true on success.

-  // Inputs:

-  //   data: Pointer to the data

-  //   length: Length of the data

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.  The range of allowed values is [1, 126].

-  //   timecode:     Absolute (not relative to cluster) timestamp of the

-  //                 frame, expressed in timecode units.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrame(const uint8* data, uint64 length, uint64 track_number,

-                uint64 timecode,  // timecode units (absolute)

-                bool is_key);

-  // Adds a frame to be output in the file. The frame is written out through

-  // |writer_| if successful. Returns true on success.

-  // Inputs:

-  //   data: Pointer to the data

-  //   length: Length of the data

-  //   additional: Pointer to the additional data

-  //   additional_length: Length of the additional data

-  //   add_id: Value of BlockAddID element

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.  The range of allowed values is [1, 126].

-  //   abs_timecode: Absolute (not relative to cluster) timestamp of the

-  //                 frame, expressed in timecode units.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrameWithAdditional(const uint8* data, uint64 length,

-                              const uint8* additional, uint64 additional_length,

-                              uint64 add_id, uint64 track_number,

-                              uint64 abs_timecode, bool is_key);

-  // Adds a frame to be output in the file. The frame is written out through

-  // |writer_| if successful. Returns true on success.

-  // Inputs:

-  //   data: Pointer to the data.

-  //   length: Length of the data.

-  //   discard_padding: DiscardPadding element value.

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.  The range of allowed values is [1, 126].

-  //   abs_timecode: Absolute (not relative to cluster) timestamp of the

-  //                 frame, expressed in timecode units.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrameWithDiscardPadding(const uint8* data, uint64 length,

-                                  int64 discard_padding, uint64 track_number,

-                                  uint64 abs_timecode, bool is_key);

-  // Writes a frame of metadata to the output medium; returns true on

-  // success.

-  // Inputs:

-  //   data: Pointer to the data

-  //   length: Length of the data

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.  The range of allowed values is [1, 126].

-  //   timecode:     Absolute (not relative to cluster) timestamp of the

-  //                 metadata frame, expressed in timecode units.

-  //   duration:     Duration of metadata frame, in timecode units.

-  //

-  // The metadata frame is written as a block group, with a duration

-  // sub-element but no reference time sub-elements (indicating that

-  // it is considered a keyframe, per Matroska semantics).

-  bool AddMetadata(const uint8* data, uint64 length, uint64 track_number,

-                   uint64 timecode, uint64 duration);

-  // Increments the size of the cluster's data in bytes.

-  void AddPayloadSize(uint64 size);

-  // Closes the cluster so no more data can be written to it. Will update the

-  // cluster's size if |writer_| is seekable. Returns true on success.

-  bool Finalize();

-  // Returns the size in bytes for the entire Cluster element.

-  uint64 Size() const;

-  // Given |abs_timecode|, calculates timecode relative to most recent timecode.

-  // Returns -1 on failure, or a relative timecode.

-  int64 GetRelativeTimecode(int64 abs_timecode) const;

-  int64 size_position() const { return size_position_; }

-  int32 blocks_added() const { return blocks_added_; }

-  uint64 payload_size() const { return payload_size_; }

-  int64 position_for_cues() const { return position_for_cues_; }

-  uint64 timecode() const { return timecode_; }

-  uint64 timecode_scale() const { return timecode_scale_; }

- private:

-  // Utility method that confirms that blocks can still be added, and that the

-  // cluster header has been written. Used by |DoWriteFrame*|. Returns true

-  // when successful.

-  bool PreWriteBlock();

-  // Utility method used by the |DoWriteFrame*| methods that handles the book

-  // keeping required after each block is written.

-  void PostWriteBlock(uint64 element_size);

-  // Does some verification and calls WriteFrame.

-  bool DoWriteFrame(const Frame* const frame);

-  // Outputs the Cluster header to |writer_|. Returns true on success.

-  bool WriteClusterHeader();

-  // Number of blocks added to the cluster.

-  int32 blocks_added_;

-  // Flag telling if the cluster has been closed.

-  bool finalized_;

-  // Flag telling if the cluster's header has been written.

-  bool header_written_;

-  // The size of the cluster elements in bytes.

-  uint64 payload_size_;

-  // The file position used for cue points.

-  const int64 position_for_cues_;

-  // The file position of the cluster's size element.

-  int64 size_position_;

-  // The absolute timecode of the cluster.

-  const uint64 timecode_;

-  // The timecode scale of the Segment containing the cluster.

-  const uint64 timecode_scale_;

-  // Pointer to the writer object. Not owned by this class.

-  IMkvWriter* writer_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Cluster);

-};

-///////////////////////////////////////////////////////////////

-// SeekHead element

-class SeekHead {

- public:

-  SeekHead();

-  ~SeekHead();

-  // TODO(fgalligan): Change this to reserve a certain size. Then check how

-  // big the seek entry to be added is as not every seek entry will be the

-  // maximum size it could be.

-  // Adds a seek entry to be written out when the element is finalized. |id|

-  // must be the coded mkv element id. |pos| is the file position of the

-  // element. Returns true on success.

-  bool AddSeekEntry(uint32 id, uint64 pos);

-  // Writes out SeekHead and SeekEntry elements. Returns true on success.

-  bool Finalize(IMkvWriter* writer) const;

-  // Returns the id of the Seek Entry at the given index. Returns -1 if index is

-  // out of range.

-  uint32 GetId(int index) const;

-  // Returns the position of the Seek Entry at the given index. Returns -1 if

-  // index is out of range.

-  uint64 GetPosition(int index) const;

-  // Sets the Seek Entry id and position at given index.

-  // Returns true on success.

-  bool SetSeekEntry(int index, uint32 id, uint64 position);

-  // Reserves space by writing out a Void element which will be updated with

-  // a SeekHead element later. Returns true on success.

-  bool Write(IMkvWriter* writer);

-  // We are going to put a cap on the number of Seek Entries.

-  const static int32 kSeekEntryCount = 5;

- private:

-  // Returns the maximum size in bytes of one seek entry.

-  uint64 MaxEntrySize() const;

-  // Seek entry id element list.

-  uint32 seek_entry_id_[kSeekEntryCount];

-  // Seek entry pos element list.

-  uint64 seek_entry_pos_[kSeekEntryCount];

-  // The file position of SeekHead element.

-  int64 start_pos_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(SeekHead);

-};

-///////////////////////////////////////////////////////////////

-// Segment Information element

-class SegmentInfo {

- public:

-  SegmentInfo();

-  ~SegmentInfo();

-  // Will update the duration if |duration_| is > 0.0. Returns true on success.

-  bool Finalize(IMkvWriter* writer) const;

-  // Sets |muxing_app_| and |writing_app_|.

-  bool Init();

-  // Output the Segment Information element to the writer. Returns true on

-  // success.

-  bool Write(IMkvWriter* writer);

-  void set_duration(double duration) { duration_ = duration; }

-  double duration() const { return duration_; }

-  void set_muxing_app(const char* app);

-  const char* muxing_app() const { return muxing_app_; }

-  void set_timecode_scale(uint64 scale) { timecode_scale_ = scale; }

-  uint64 timecode_scale() const { return timecode_scale_; }

-  void set_writing_app(const char* app);

-  const char* writing_app() const { return writing_app_; }

-  void set_date_utc(int64 date_utc) { date_utc_ = date_utc; }

-  int64 date_utc() const { return date_utc_; }

- private:

-  // Segment Information element names.

-  // Initially set to -1 to signify that a duration has not been set and should

-  // not be written out.

-  double duration_;

-  // Set to libwebm-%d.%d.%d.%d, major, minor, build, revision.

-  char* muxing_app_;

-  uint64 timecode_scale_;

-  // Initially set to libwebm-%d.%d.%d.%d, major, minor, build, revision.

-  char* writing_app_;

-  // LLONG_MIN when DateUTC is not set.

-  int64 date_utc_;

-  // The file position of the duration element.

-  int64 duration_pos_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(SegmentInfo);

-};

-///////////////////////////////////////////////////////////////

-// This class represents the main segment in a WebM file. Currently only

-// supports one Segment element.

-//

-// Notes:

-//  |Init| must be called before any other method in this class.

-class Segment {

- public:

-  enum Mode { kLive = 0x1, kFile = 0x2 };

-  enum CuesPosition {

-    kAfterClusters = 0x0,  // Position Cues after Clusters - Default

-    kBeforeClusters = 0x1  // Position Cues before Clusters

-  };

-  const static uint32 kDefaultDocTypeVersion = 2;

-  const static uint64 kDefaultMaxClusterDuration = 30000000000ULL;

-  Segment();

-  ~Segment();

-  // Initializes |SegmentInfo| and returns result. Always returns false when

-  // |ptr_writer| is NULL.

-  bool Init(IMkvWriter* ptr_writer);

-  // Adds a generic track to the segment.  Returns the newly-allocated

-  // track object (which is owned by the segment) on success, NULL on

-  // error. |number| is the number to use for the track.  |number|

-  // must be >= 0. If |number| == 0 then the muxer will decide on the

-  // track number.

-  Track* AddTrack(int32 number);

-  // Adds a Vorbis audio track to the segment. Returns the number of the track

-  // on success, 0 on error. |number| is the number to use for the audio track.

-  // |number| must be >= 0. If |number| == 0 then the muxer will decide on

-  // the track number.

-  uint64 AddAudioTrack(int32 sample_rate, int32 channels, int32 number);

-  // Adds an empty chapter to the chapters of this segment.  Returns

-  // non-NULL on success.  After adding the chapter, the caller should

-  // populate its fields via the Chapter member functions.

-  Chapter* AddChapter();

-  // Adds an empty tag to the tags of this segment.  Returns

-  // non-NULL on success.  After adding the tag, the caller should

-  // populate its fields via the Tag member functions.

-  Tag* AddTag();

-  // Adds a cue point to the Cues element. |timestamp| is the time in

-  // nanoseconds of the cue's time. |track| is the Track of the Cue. This

-  // function must be called after AddFrame to calculate the correct

-  // BlockNumber for the CuePoint. Returns true on success.

-  bool AddCuePoint(uint64 timestamp, uint64 track);

-  // Adds a frame to be output in the file. Returns true on success.

-  // Inputs:

-  //   data: Pointer to the data

-  //   length: Length of the data

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.

-  //   timestamp:    Timestamp of the frame in nanoseconds from 0.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrame(const uint8* data, uint64 length, uint64 track_number,

-                uint64 timestamp_ns, bool is_key);

-  // Writes a frame of metadata to the output medium; returns true on

-  // success.

-  // Inputs:

-  //   data: Pointer to the data

-  //   length: Length of the data

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.

-  //   timecode:     Absolute timestamp of the metadata frame, expressed

-  //                 in nanosecond units.

-  //   duration:     Duration of metadata frame, in nanosecond units.

-  //

-  // The metadata frame is written as a block group, with a duration

-  // sub-element but no reference time sub-elements (indicating that

-  // it is considered a keyframe, per Matroska semantics).

-  bool AddMetadata(const uint8* data, uint64 length, uint64 track_number,

-                   uint64 timestamp_ns, uint64 duration_ns);

-  // Writes a frame with additional data to the output medium; returns true on

-  // success.

-  // Inputs:

-  //   data: Pointer to the data.

-  //   length: Length of the data.

-  //   additional: Pointer to additional data.

-  //   additional_length: Length of additional data.

-  //   add_id: Additional ID which identifies the type of additional data.

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.

-  //   timestamp:    Absolute timestamp of the frame, expressed in nanosecond

-  //                 units.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrameWithAdditional(const uint8* data, uint64 length,

-                              const uint8* additional, uint64 additional_length,

-                              uint64 add_id, uint64 track_number,

-                              uint64 timestamp, bool is_key);

-  // Writes a frame with DiscardPadding to the output medium; returns true on

-  // success.

-  // Inputs:

-  //   data: Pointer to the data.

-  //   length: Length of the data.

-  //   discard_padding: DiscardPadding element value.

-  //   track_number: Track to add the data to. Value returned by Add track

-  //                 functions.

-  //   timestamp:    Absolute timestamp of the frame, expressed in nanosecond

-  //                 units.

-  //   is_key:       Flag telling whether or not this frame is a key frame.

-  bool AddFrameWithDiscardPadding(const uint8* data, uint64 length,

-                                  int64 discard_padding, uint64 track_number,

-                                  uint64 timestamp, bool is_key);

-  // Writes a Frame to the output medium. Chooses the correct way of writing

-  // the frame (Block vs SimpleBlock) based on the parameters passed.

-  // Inputs:

-  //   frame: frame object

-  bool AddGenericFrame(const Frame* frame);

-  // Adds a VP8 video track to the segment. Returns the number of the track on

-  // success, 0 on error. |number| is the number to use for the video track.

-  // |number| must be >= 0. If |number| == 0 then the muxer will decide on

-  // the track number.

-  uint64 AddVideoTrack(int32 width, int32 height, int32 number);

-  // This function must be called after Finalize() if you need a copy of the

-  // output with Cues written before the Clusters. It will return false if the

-  // writer is not seekable of if chunking is set to true.

-  // Input parameters:

-  // reader - an IMkvReader object created with the same underlying file of the

-  //          current writer object. Make sure to close the existing writer

-  //          object before creating this so that all the data is properly

-  //          flushed and available for reading.

-  // writer - an IMkvWriter object pointing to a *different* file than the one

-  //          pointed by the current writer object. This file will contain the

-  //          Cues element before the Clusters.

-  bool CopyAndMoveCuesBeforeClusters(mkvparser::IMkvReader* reader,

-                                     IMkvWriter* writer);

-  // Sets which track to use for the Cues element. Must have added the track

-  // before calling this function. Returns true on success. |track_number| is

-  // returned by the Add track functions.

-  bool CuesTrack(uint64 track_number);

-  // This will force the muxer to create a new Cluster when the next frame is

-  // added.

-  void ForceNewClusterOnNextFrame();

-  // Writes out any frames that have not been written out. Finalizes the last

-  // cluster. May update the size and duration of the segment. May output the

-  // Cues element. May finalize the SeekHead element. Returns true on success.

-  bool Finalize();

-  // Returns the Cues object.

-  Cues* GetCues() { return &cues_; }

-  // Returns the Segment Information object.

-  const SegmentInfo* GetSegmentInfo() const { return &segment_info_; }

-  SegmentInfo* GetSegmentInfo() { return &segment_info_; }

-  // Search the Tracks and return the track that matches |track_number|.

-  // Returns NULL if there is no track match.

-  Track* GetTrackByNumber(uint64 track_number) const;

-  // Toggles whether to output a cues element.

-  void OutputCues(bool output_cues);

-  // Sets if the muxer will output files in chunks or not. |chunking| is a

-  // flag telling whether or not to turn on chunking. |filename| is the base

-  // filename for the chunk files. The header chunk file will be named

-  // |filename|.hdr and the data chunks will be named

-  // |filename|_XXXXXX.chk. Chunking implies that the muxer will be writing

-  // to files so the muxer will use the default MkvWriter class to control

-  // what data is written to what files. Returns true on success.

-  // TODO: Should we change the IMkvWriter Interface to add Open and Close?

-  // That will force the interface to be dependent on files.

-  bool SetChunking(bool chunking, const char* filename);

-  bool chunking() const { return chunking_; }

-  uint64 cues_track() const { return cues_track_; }

-  void set_max_cluster_duration(uint64 max_cluster_duration) {

-    max_cluster_duration_ = max_cluster_duration;

-  }

-  uint64 max_cluster_duration() const { return max_cluster_duration_; }

-  void set_max_cluster_size(uint64 max_cluster_size) {

-    max_cluster_size_ = max_cluster_size;

-  }

-  uint64 max_cluster_size() const { return max_cluster_size_; }

-  void set_mode(Mode mode) { mode_ = mode; }

-  Mode mode() const { return mode_; }

-  CuesPosition cues_position() const { return cues_position_; }

-  bool output_cues() const { return output_cues_; }

-  const SegmentInfo* segment_info() const { return &segment_info_; }

- private:

-  // Checks if header information has been output and initialized. If not it

-  // will output the Segment element and initialize the SeekHead elment and

-  // Cues elements.

-  bool CheckHeaderInfo();

-  // Sets |doc_type_version_| based on the current element requirements.

-  void UpdateDocTypeVersion();

-  // Sets |name| according to how many chunks have been written. |ext| is the

-  // file extension. |name| must be deleted by the calling app. Returns true

-  // on success.

-  bool UpdateChunkName(const char* ext, char** name) const;

-  // Returns the maximum offset within the segment's payload. When chunking

-  // this function is needed to determine offsets of elements within the

-  // chunked files. Returns -1 on error.

-  int64 MaxOffset();

-  // Adds the frame to our frame array.

-  bool QueueFrame(Frame* frame);

-  // Output all frames that are queued. Returns -1 on error, otherwise

-  // it returns the number of frames written.

-  int WriteFramesAll();

-  // Output all frames that are queued that have an end time that is less

-  // then |timestamp|. Returns true on success and if there are no frames

-  // queued.

-  bool WriteFramesLessThan(uint64 timestamp);

-  // Outputs the segment header, Segment Information element, SeekHead element,

-  // and Tracks element to |writer_|.

-  bool WriteSegmentHeader();

-  // Given a frame with the specified timestamp (nanosecond units) and

-  // keyframe status, determine whether a new cluster should be

-  // created, before writing enqueued frames and the frame itself. The

-  // function returns one of the following values:

-  //  -1 = error: an out-of-order frame was detected

-  //  0 = do not create a new cluster, and write frame to the existing cluster

-  //  1 = create a new cluster, and write frame to that new cluster

-  //  2 = create a new cluster, and re-run test

-  int TestFrame(uint64 track_num, uint64 timestamp_ns, bool key) const;

-  // Create a new cluster, using the earlier of the first enqueued

-  // frame, or the indicated time. Returns true on success.

-  bool MakeNewCluster(uint64 timestamp_ns);

-  // Checks whether a new cluster needs to be created, and if so

-  // creates a new cluster. Returns false if creation of a new cluster

-  // was necessary but creation was not successful.

-  bool DoNewClusterProcessing(uint64 track_num, uint64 timestamp_ns, bool key);

-  // Adjusts Cue Point values (to place Cues before Clusters) so that they

-  // reflect the correct offsets.

-  void MoveCuesBeforeClusters();

-  // This function recursively computes the correct cluster offsets (this is

-  // done to move the Cues before Clusters). It recursively updates the change

-  // in size (which indicates a change in cluster offset) until no sizes change.

-  // Parameters:

-  // diff - indicates the difference in size of the Cues element that needs to

-  //        accounted for.

-  // index - index in the list of Cues which is currently being adjusted.

-  // cue_size - sum of size of all the CuePoint elements.

-  void MoveCuesBeforeClustersHelper(uint64 diff, int index, uint64* cue_size);

-  // Seeds the random number generator used to make UIDs.

-  unsigned int seed_;

-  // WebM elements

-  Cues cues_;

-  SeekHead seek_head_;

-  SegmentInfo segment_info_;

-  Tracks tracks_;

-  Chapters chapters_;

-  Tags tags_;

-  // Number of chunks written.

-  int chunk_count_;

-  // Current chunk filename.

-  char* chunk_name_;

-  // Default MkvWriter object created by this class used for writing clusters

-  // out in separate files.

-  MkvWriter* chunk_writer_cluster_;

-  // Default MkvWriter object created by this class used for writing Cues

-  // element out to a file.

-  MkvWriter* chunk_writer_cues_;

-  // Default MkvWriter object created by this class used for writing the

-  // Matroska header out to a file.

-  MkvWriter* chunk_writer_header_;

-  // Flag telling whether or not the muxer is chunking output to multiple

-  // files.

-  bool chunking_;

-  // Base filename for the chunked files.

-  char* chunking_base_name_;

-  // File position offset where the Clusters end.

-  int64 cluster_end_offset_;

-  // List of clusters.

-  Cluster** cluster_list_;

-  // Number of cluster pointers allocated in the cluster list.

-  int32 cluster_list_capacity_;

-  // Number of clusters in the cluster list.

-  int32 cluster_list_size_;

-  // Indicates whether Cues should be written before or after Clusters

-  CuesPosition cues_position_;

-  // Track number that is associated with the cues element for this segment.

-  uint64 cues_track_;

-  // Tells the muxer to force a new cluster on the next Block.

-  bool force_new_cluster_;

-  // List of stored audio frames. These variables are used to store frames so

-  // the muxer can follow the guideline "Audio blocks that contain the video

-  // key frame's timecode should be in the same cluster as the video key frame

-  // block."

-  Frame** frames_;

-  // Number of frame pointers allocated in the frame list.

-  int32 frames_capacity_;

-  // Number of frames in the frame list.

-  int32 frames_size_;

-  // Flag telling if a video track has been added to the segment.

-  bool has_video_;

-  // Flag telling if the segment's header has been written.

-  bool header_written_;

-  // Duration of the last block in nanoseconds.

-  uint64 last_block_duration_;

-  // Last timestamp in nanoseconds added to a cluster.

-  uint64 last_timestamp_;

-  // Last timestamp in nanoseconds by track number added to a cluster.

-  uint64 last_track_timestamp_[kMaxTrackNumber];

-  // Maximum time in nanoseconds for a cluster duration. This variable is a

-  // guideline and some clusters may have a longer duration. Default is 30

-  // seconds.

-  uint64 max_cluster_duration_;

-  // Maximum size in bytes for a cluster. This variable is a guideline and

-  // some clusters may have a larger size. Default is 0 which signifies that

-  // the muxer will decide the size.

-  uint64 max_cluster_size_;

-  // The mode that segment is in. If set to |kLive| the writer must not

-  // seek backwards.

-  Mode mode_;

-  // Flag telling the muxer that a new cue point should be added.

-  bool new_cuepoint_;

-  // TODO(fgalligan): Should we add support for more than one Cues element?

-  // Flag whether or not the muxer should output a Cues element.

-  bool output_cues_;

-  // The size of the EBML header, used to validate the header if

-  // WriteEbmlHeader() is called more than once.

-  int32 ebml_header_size_;

-  // The file position of the segment's payload.

-  int64 payload_pos_;

-  // The file position of the element's size.

-  int64 size_position_;

-  // Current DocTypeVersion (|doc_type_version_|) and that written in

-  // WriteSegmentHeader().

-  // WriteEbmlHeader() will be called from Finalize() if |doc_type_version_|

-  // differs from |doc_type_version_written_|.

-  uint32 doc_type_version_;

-  uint32 doc_type_version_written_;

-  // Pointer to the writer objects. Not owned by this class.

-  IMkvWriter* writer_cluster_;

-  IMkvWriter* writer_cues_;

-  IMkvWriter* writer_header_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Segment);

-};

-}  // end namespace mkvmuxer

-#endif  // MKVMUXER_HPP

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvmuxer.cc

@@ -1,0 +1,3759 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "mkvmuxer/mkvmuxer.h"

+#include <cfloat>

+#include <climits>

+#include <cstdio>

+#include <cstdlib>

+#include <cstring>

+#include <ctime>

+#include <memory>

+#include <new>

+#include <vector>

+#include "common/webmids.h"

+#include "mkvmuxer/mkvmuxerutil.h"

+#include "mkvmuxer/mkvwriter.h"

+#include "mkvparser/mkvparser.h"

+namespace mkvmuxer {

+const float MasteringMetadata::kValueNotPresent = FLT_MAX;

+const uint64_t Colour::kValueNotPresent = UINT64_MAX;

+namespace {

+// Deallocate the string designated by |dst|, and then copy the |src|

+// string to |dst|.  The caller owns both the |src| string and the

+// |dst| copy (hence the caller is responsible for eventually

+// deallocating the strings, either directly, or indirectly via

+// StrCpy).  Returns true if the source string was successfully copied

+// to the destination.

+bool StrCpy(const char* src, char** dst_ptr) {

+  if (dst_ptr == NULL)

+    return false;

+  char*& dst = *dst_ptr;

+  delete[] dst;

+  dst = NULL;

+  if (src == NULL)

+    return true;

+  const size_t size = strlen(src) + 1;

+  dst = new (std::nothrow) char[size];  // NOLINT

+  if (dst == NULL)

+    return false;

+  strcpy(dst, src);  // NOLINT

+  return true;

+}

+typedef std::auto_ptr<PrimaryChromaticity> PrimaryChromaticityPtr;

+bool CopyChromaticity(const PrimaryChromaticity* src,

+                      PrimaryChromaticityPtr* dst) {

+  if (!dst)

+    return false;

+  dst->reset(new (std::nothrow) PrimaryChromaticity(src->x, src->y));

+  if (!dst->get())

+    return false;

+  return true;

+}

+}  // namespace

+///////////////////////////////////////////////////////////////

+//

+// IMkvWriter Class

+IMkvWriter::IMkvWriter() {}

+IMkvWriter::~IMkvWriter() {}

+bool WriteEbmlHeader(IMkvWriter* writer, uint64_t doc_type_version) {

+  // Level 0

+  uint64_t size = EbmlElementSize(libwebm::kMkvEBMLVersion, UINT64_C(1));

+  size += EbmlElementSize(libwebm::kMkvEBMLReadVersion, UINT64_C(1));

+  size += EbmlElementSize(libwebm::kMkvEBMLMaxIDLength, UINT64_C(4));

+  size += EbmlElementSize(libwebm::kMkvEBMLMaxSizeLength, UINT64_C(8));

+  size += EbmlElementSize(libwebm::kMkvDocType, "webm");

+  size += EbmlElementSize(libwebm::kMkvDocTypeVersion, doc_type_version);

+  size += EbmlElementSize(libwebm::kMkvDocTypeReadVersion, UINT64_C(2));

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvEBML, size))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvEBMLVersion, UINT64_C(1)))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvEBMLReadVersion, UINT64_C(1)))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvEBMLMaxIDLength, UINT64_C(4)))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvEBMLMaxSizeLength, UINT64_C(8)))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvDocType, "webm"))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvDocTypeVersion, doc_type_version))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvDocTypeReadVersion, UINT64_C(2)))

+    return false;

+  return true;

+}

+bool WriteEbmlHeader(IMkvWriter* writer) {

+  return WriteEbmlHeader(writer, mkvmuxer::Segment::kDefaultDocTypeVersion);

+}

+bool ChunkedCopy(mkvparser::IMkvReader* source, mkvmuxer::IMkvWriter* dst,

+                 int64_t start, int64_t size) {

+  // TODO(vigneshv): Check if this is a reasonable value.

+  const uint32_t kBufSize = 2048;

+  uint8_t* buf = new uint8_t[kBufSize];

+  int64_t offset = start;

+  while (size > 0) {

+    const int64_t read_len = (size > kBufSize) ? kBufSize : size;

+    if (source->Read(offset, static_cast<long>(read_len), buf))

+      return false;

+    dst->Write(buf, static_cast<uint32_t>(read_len));

+    offset += read_len;

+    size -= read_len;

+  }

+  delete[] buf;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// Frame Class

+Frame::Frame()

+    : add_id_(0),

+      additional_(NULL),

+      additional_length_(0),

+      duration_(0),

+      duration_set_(false),

+      frame_(NULL),

+      is_key_(false),

+      length_(0),

+      track_number_(0),

+      timestamp_(0),

+      discard_padding_(0),

+      reference_block_timestamp_(0),

+      reference_block_timestamp_set_(false) {}

+Frame::~Frame() {

+  delete[] frame_;

+  delete[] additional_;

+}

+bool Frame::CopyFrom(const Frame& frame) {

+  delete[] frame_;

+  frame_ = NULL;

+  length_ = 0;

+  if (frame.length() > 0 && frame.frame() != NULL &&

+      !Init(frame.frame(), frame.length())) {

+    return false;

+  }

+  add_id_ = 0;

+  delete[] additional_;

+  additional_ = NULL;

+  additional_length_ = 0;

+  if (frame.additional_length() > 0 && frame.additional() != NULL &&

+      !AddAdditionalData(frame.additional(), frame.additional_length(),

+                         frame.add_id())) {

+    return false;

+  }

+  duration_ = frame.duration();

+  duration_set_ = frame.duration_set();

+  is_key_ = frame.is_key();

+  track_number_ = frame.track_number();

+  timestamp_ = frame.timestamp();

+  discard_padding_ = frame.discard_padding();

+  reference_block_timestamp_ = frame.reference_block_timestamp();

+  reference_block_timestamp_set_ = frame.reference_block_timestamp_set();

+  return true;

+}

+bool Frame::Init(const uint8_t* frame, uint64_t length) {

+  uint8_t* const data =

+      new (std::nothrow) uint8_t[static_cast<size_t>(length)];  // NOLINT

+  if (!data)

+    return false;

+  delete[] frame_;

+  frame_ = data;

+  length_ = length;

+  memcpy(frame_, frame, static_cast<size_t>(length_));

+  return true;

+}

+bool Frame::AddAdditionalData(const uint8_t* additional, uint64_t length,

+                              uint64_t add_id) {

+  uint8_t* const data =

+      new (std::nothrow) uint8_t[static_cast<size_t>(length)];  // NOLINT

+  if (!data)

+    return false;

+  delete[] additional_;

+  additional_ = data;

+  additional_length_ = length;

+  add_id_ = add_id;

+  memcpy(additional_, additional, static_cast<size_t>(additional_length_));

+  return true;

+}

+bool Frame::IsValid() const {

+  if (length_ == 0 || !frame_) {

+    return false;

+  }

+  if ((additional_length_ != 0 && !additional_) ||

+      (additional_ != NULL && additional_length_ == 0)) {

+    return false;

+  }

+  if (track_number_ == 0 || track_number_ > kMaxTrackNumber) {

+    return false;

+  }

+  if (!CanBeSimpleBlock() && !is_key_ && !reference_block_timestamp_set_) {

+    return false;

+  }

+  return true;

+}

+bool Frame::CanBeSimpleBlock() const {

+  return additional_ == NULL && discard_padding_ == 0 && duration_ == 0;

+}

+void Frame::set_duration(uint64_t duration) {

+  duration_ = duration;

+  duration_set_ = true;

+}

+void Frame::set_reference_block_timestamp(int64_t reference_block_timestamp) {

+  reference_block_timestamp_ = reference_block_timestamp;

+  reference_block_timestamp_set_ = true;

+}

+///////////////////////////////////////////////////////////////

+//

+// CuePoint Class

+CuePoint::CuePoint()

+    : time_(0),

+      track_(0),

+      cluster_pos_(0),

+      block_number_(1),

+      output_block_number_(true) {}

+CuePoint::~CuePoint() {}

+bool CuePoint::Write(IMkvWriter* writer) const {

+  if (!writer || track_ < 1 || cluster_pos_ < 1)

+    return false;

+  uint64_t size =

+      EbmlElementSize(libwebm::kMkvCueClusterPosition, cluster_pos_);

+  size += EbmlElementSize(libwebm::kMkvCueTrack, track_);

+  if (output_block_number_ && block_number_ > 1)

+    size += EbmlElementSize(libwebm::kMkvCueBlockNumber, block_number_);

+  const uint64_t track_pos_size =

+      EbmlMasterElementSize(libwebm::kMkvCueTrackPositions, size) + size;

+  const uint64_t payload_size =

+      EbmlElementSize(libwebm::kMkvCueTime, time_) + track_pos_size;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvCuePoint, payload_size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvCueTime, time_))

+    return false;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvCueTrackPositions, size))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvCueTrack, track_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvCueClusterPosition, cluster_pos_))

+    return false;

+  if (output_block_number_ && block_number_ > 1)

+    if (!WriteEbmlElement(writer, libwebm::kMkvCueBlockNumber, block_number_))

+      return false;

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0)

+    return false;

+  if (stop_position - payload_position != static_cast<int64_t>(payload_size))

+    return false;

+  return true;

+}

+uint64_t CuePoint::PayloadSize() const {

+  uint64_t size =

+      EbmlElementSize(libwebm::kMkvCueClusterPosition, cluster_pos_);

+  size += EbmlElementSize(libwebm::kMkvCueTrack, track_);

+  if (output_block_number_ && block_number_ > 1)

+    size += EbmlElementSize(libwebm::kMkvCueBlockNumber, block_number_);

+  const uint64_t track_pos_size =

+      EbmlMasterElementSize(libwebm::kMkvCueTrackPositions, size) + size;

+  const uint64_t payload_size =

+      EbmlElementSize(libwebm::kMkvCueTime, time_) + track_pos_size;

+  return payload_size;

+}

+uint64_t CuePoint::Size() const {

+  const uint64_t payload_size = PayloadSize();

+  return EbmlMasterElementSize(libwebm::kMkvCuePoint, payload_size) +

+         payload_size;

+}

+///////////////////////////////////////////////////////////////

+//

+// Cues Class

+Cues::Cues()

+    : cue_entries_capacity_(0),

+      cue_entries_size_(0),

+      cue_entries_(NULL),

+      output_block_number_(true) {}

+Cues::~Cues() {

+  if (cue_entries_) {

+    for (int32_t i = 0; i < cue_entries_size_; ++i) {

+      CuePoint* const cue = cue_entries_[i];

+      delete cue;

+    }

+    delete[] cue_entries_;

+  }

+}

+bool Cues::AddCue(CuePoint* cue) {

+  if (!cue)

+    return false;

+  if ((cue_entries_size_ + 1) > cue_entries_capacity_) {

+    // Add more CuePoints.

+    const int32_t new_capacity =

+        (!cue_entries_capacity_) ? 2 : cue_entries_capacity_ * 2;

+    if (new_capacity < 1)

+      return false;

+    CuePoint** const cues =

+        new (std::nothrow) CuePoint*[new_capacity];  // NOLINT

+    if (!cues)

+      return false;

+    for (int32_t i = 0; i < cue_entries_size_; ++i) {

+      cues[i] = cue_entries_[i];

+    }

+    delete[] cue_entries_;

+    cue_entries_ = cues;

+    cue_entries_capacity_ = new_capacity;

+  }

+  cue->set_output_block_number(output_block_number_);

+  cue_entries_[cue_entries_size_++] = cue;

+  return true;

+}

+CuePoint* Cues::GetCueByIndex(int32_t index) const {

+  if (cue_entries_ == NULL)

+    return NULL;

+  if (index >= cue_entries_size_)

+    return NULL;

+  return cue_entries_[index];

+}

+uint64_t Cues::Size() {

+  uint64_t size = 0;

+  for (int32_t i = 0; i < cue_entries_size_; ++i)

+    size += GetCueByIndex(i)->Size();

+  size += EbmlMasterElementSize(libwebm::kMkvCues, size);

+  return size;

+}

+bool Cues::Write(IMkvWriter* writer) const {

+  if (!writer)

+    return false;

+  uint64_t size = 0;

+  for (int32_t i = 0; i < cue_entries_size_; ++i) {

+    const CuePoint* const cue = GetCueByIndex(i);

+    if (!cue)

+      return false;

+    size += cue->Size();

+  }

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvCues, size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  for (int32_t i = 0; i < cue_entries_size_; ++i) {

+    const CuePoint* const cue = GetCueByIndex(i);

+    if (!cue->Write(writer))

+      return false;

+  }

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0)

+    return false;

+  if (stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// ContentEncAESSettings Class

+ContentEncAESSettings::ContentEncAESSettings() : cipher_mode_(kCTR) {}

+uint64_t ContentEncAESSettings::Size() const {

+  const uint64_t payload = PayloadSize();

+  const uint64_t size =

+      EbmlMasterElementSize(libwebm::kMkvContentEncAESSettings, payload) +

+      payload;

+  return size;

+}

+bool ContentEncAESSettings::Write(IMkvWriter* writer) const {

+  const uint64_t payload = PayloadSize();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvContentEncAESSettings,

+                              payload))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvAESSettingsCipherMode,

+                        cipher_mode_))

+    return false;

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(payload))

+    return false;

+  return true;

+}

+uint64_t ContentEncAESSettings::PayloadSize() const {

+  uint64_t size =

+      EbmlElementSize(libwebm::kMkvAESSettingsCipherMode, cipher_mode_);

+  return size;

+}

+///////////////////////////////////////////////////////////////

+//

+// ContentEncoding Class

+ContentEncoding::ContentEncoding()

+    : enc_algo_(5),

+      enc_key_id_(NULL),

+      encoding_order_(0),

+      encoding_scope_(1),

+      encoding_type_(1),

+      enc_key_id_length_(0) {}

+ContentEncoding::~ContentEncoding() { delete[] enc_key_id_; }

+bool ContentEncoding::SetEncryptionID(const uint8_t* id, uint64_t length) {

+  if (!id || length < 1)

+    return false;

+  delete[] enc_key_id_;

+  enc_key_id_ =

+      new (std::nothrow) uint8_t[static_cast<size_t>(length)];  // NOLINT

+  if (!enc_key_id_)

+    return false;

+  memcpy(enc_key_id_, id, static_cast<size_t>(length));

+  enc_key_id_length_ = length;

+  return true;

+}

+uint64_t ContentEncoding::Size() const {

+  const uint64_t encryption_size = EncryptionSize();

+  const uint64_t encoding_size = EncodingSize(0, encryption_size);

+  const uint64_t encodings_size =

+      EbmlMasterElementSize(libwebm::kMkvContentEncoding, encoding_size) +

+      encoding_size;

+  return encodings_size;

+}

+bool ContentEncoding::Write(IMkvWriter* writer) const {

+  const uint64_t encryption_size = EncryptionSize();

+  const uint64_t encoding_size = EncodingSize(0, encryption_size);

+  const uint64_t size =

+      EbmlMasterElementSize(libwebm::kMkvContentEncoding, encoding_size) +

+      encoding_size;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvContentEncoding,

+                              encoding_size))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvContentEncodingOrder,

+                        encoding_order_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvContentEncodingScope,

+                        encoding_scope_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvContentEncodingType,

+                        encoding_type_))

+    return false;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvContentEncryption,

+                              encryption_size))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvContentEncAlgo, enc_algo_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvContentEncKeyID, enc_key_id_,

+                        enc_key_id_length_))

+    return false;

+  if (!enc_aes_settings_.Write(writer))

+    return false;

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  return true;

+}

+uint64_t ContentEncoding::EncodingSize(uint64_t compresion_size,

+                                       uint64_t encryption_size) const {

+  // TODO(fgalligan): Add support for compression settings.

+  if (compresion_size != 0)

+    return 0;

+  uint64_t encoding_size = 0;

+  if (encryption_size > 0) {

+    encoding_size +=

+        EbmlMasterElementSize(libwebm::kMkvContentEncryption, encryption_size) +

+        encryption_size;

+  }

+  encoding_size +=

+      EbmlElementSize(libwebm::kMkvContentEncodingType, encoding_type_);

+  encoding_size +=

+      EbmlElementSize(libwebm::kMkvContentEncodingScope, encoding_scope_);

+  encoding_size +=

+      EbmlElementSize(libwebm::kMkvContentEncodingOrder, encoding_order_);

+  return encoding_size;

+}

+uint64_t ContentEncoding::EncryptionSize() const {

+  const uint64_t aes_size = enc_aes_settings_.Size();

+  uint64_t encryption_size = EbmlElementSize(libwebm::kMkvContentEncKeyID,

+                                             enc_key_id_, enc_key_id_length_);

+  encryption_size += EbmlElementSize(libwebm::kMkvContentEncAlgo, enc_algo_);

+  return encryption_size + aes_size;

+}

+///////////////////////////////////////////////////////////////

+//

+// Track Class

+Track::Track(unsigned int* seed)

+    : codec_id_(NULL),

+      codec_private_(NULL),

+      language_(NULL),

+      max_block_additional_id_(0),

+      name_(NULL),

+      number_(0),

+      type_(0),

+      uid_(MakeUID(seed)),

+      codec_delay_(0),

+      seek_pre_roll_(0),

+      default_duration_(0),

+      codec_private_length_(0),

+      content_encoding_entries_(NULL),

+      content_encoding_entries_size_(0) {}

+Track::~Track() {

+  delete[] codec_id_;

+  delete[] codec_private_;

+  delete[] language_;

+  delete[] name_;

+  if (content_encoding_entries_) {

+    for (uint32_t i = 0; i < content_encoding_entries_size_; ++i) {

+      ContentEncoding* const encoding = content_encoding_entries_[i];

+      delete encoding;

+    }

+    delete[] content_encoding_entries_;

+  }

+}

+bool Track::AddContentEncoding() {

+  const uint32_t count = content_encoding_entries_size_ + 1;

+  ContentEncoding** const content_encoding_entries =

+      new (std::nothrow) ContentEncoding*[count];  // NOLINT

+  if (!content_encoding_entries)

+    return false;

+  ContentEncoding* const content_encoding =

+      new (std::nothrow) ContentEncoding();  // NOLINT

+  if (!content_encoding) {

+    delete[] content_encoding_entries;

+    return false;

+  }

+  for (uint32_t i = 0; i < content_encoding_entries_size_; ++i) {

+    content_encoding_entries[i] = content_encoding_entries_[i];

+  }

+  delete[] content_encoding_entries_;

+  content_encoding_entries_ = content_encoding_entries;

+  content_encoding_entries_[content_encoding_entries_size_] = content_encoding;

+  content_encoding_entries_size_ = count;

+  return true;

+}

+ContentEncoding* Track::GetContentEncodingByIndex(uint32_t index) const {

+  if (content_encoding_entries_ == NULL)

+    return NULL;

+  if (index >= content_encoding_entries_size_)

+    return NULL;

+  return content_encoding_entries_[index];

+}

+uint64_t Track::PayloadSize() const {

+  uint64_t size = EbmlElementSize(libwebm::kMkvTrackNumber, number_);

+  size += EbmlElementSize(libwebm::kMkvTrackUID, uid_);

+  size += EbmlElementSize(libwebm::kMkvTrackType, type_);

+  if (codec_id_)

+    size += EbmlElementSize(libwebm::kMkvCodecID, codec_id_);

+  if (codec_private_)

+    size += EbmlElementSize(libwebm::kMkvCodecPrivate, codec_private_,

+                            codec_private_length_);

+  if (language_)

+    size += EbmlElementSize(libwebm::kMkvLanguage, language_);

+  if (name_)

+    size += EbmlElementSize(libwebm::kMkvName, name_);

+  if (max_block_additional_id_)

+    size += EbmlElementSize(libwebm::kMkvMaxBlockAdditionID,

+                            max_block_additional_id_);

+  if (codec_delay_)

+    size += EbmlElementSize(libwebm::kMkvCodecDelay, codec_delay_);

+  if (seek_pre_roll_)

+    size += EbmlElementSize(libwebm::kMkvSeekPreRoll, seek_pre_roll_);

+  if (default_duration_)

+    size += EbmlElementSize(libwebm::kMkvDefaultDuration, default_duration_);

+  if (content_encoding_entries_size_ > 0) {

+    uint64_t content_encodings_size = 0;

+    for (uint32_t i = 0; i < content_encoding_entries_size_; ++i) {

+      ContentEncoding* const encoding = content_encoding_entries_[i];

+      content_encodings_size += encoding->Size();

+    }

+    size += EbmlMasterElementSize(libwebm::kMkvContentEncodings,

+                                  content_encodings_size) +

+            content_encodings_size;

+  }

+  return size;

+}

+uint64_t Track::Size() const {

+  uint64_t size = PayloadSize();

+  size += EbmlMasterElementSize(libwebm::kMkvTrackEntry, size);

+  return size;

+}

+bool Track::Write(IMkvWriter* writer) const {

+  if (!writer)

+    return false;

+  // mandatory elements without a default value.

+  if (!type_ || !codec_id_)

+    return false;

+  // |size| may be bigger than what is written out in this function because

+  // derived classes may write out more data in the Track element.

+  const uint64_t payload_size = PayloadSize();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvTrackEntry, payload_size))

+    return false;

+  uint64_t size = EbmlElementSize(libwebm::kMkvTrackNumber, number_);

+  size += EbmlElementSize(libwebm::kMkvTrackUID, uid_);

+  size += EbmlElementSize(libwebm::kMkvTrackType, type_);

+  if (codec_id_)

+    size += EbmlElementSize(libwebm::kMkvCodecID, codec_id_);

+  if (codec_private_)

+    size += EbmlElementSize(libwebm::kMkvCodecPrivate, codec_private_,

+                            codec_private_length_);

+  if (language_)

+    size += EbmlElementSize(libwebm::kMkvLanguage, language_);

+  if (name_)

+    size += EbmlElementSize(libwebm::kMkvName, name_);

+  if (max_block_additional_id_)

+    size += EbmlElementSize(libwebm::kMkvMaxBlockAdditionID,

+                            max_block_additional_id_);

+  if (codec_delay_)

+    size += EbmlElementSize(libwebm::kMkvCodecDelay, codec_delay_);

+  if (seek_pre_roll_)

+    size += EbmlElementSize(libwebm::kMkvSeekPreRoll, seek_pre_roll_);

+  if (default_duration_)

+    size += EbmlElementSize(libwebm::kMkvDefaultDuration, default_duration_);

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTrackNumber, number_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTrackUID, uid_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTrackType, type_))

+    return false;

+  if (max_block_additional_id_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvMaxBlockAdditionID,

+                          max_block_additional_id_)) {

+      return false;

+    }

+  }

+  if (codec_delay_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvCodecDelay, codec_delay_))

+      return false;

+  }

+  if (seek_pre_roll_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvSeekPreRoll, seek_pre_roll_))

+      return false;

+  }

+  if (default_duration_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvDefaultDuration,

+                          default_duration_))

+      return false;

+  }

+  if (codec_id_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvCodecID, codec_id_))

+      return false;

+  }

+  if (codec_private_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvCodecPrivate, codec_private_,

+                          codec_private_length_))

+      return false;

+  }

+  if (language_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvLanguage, language_))

+      return false;

+  }

+  if (name_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvName, name_))

+      return false;

+  }

+  int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  if (content_encoding_entries_size_ > 0) {

+    uint64_t content_encodings_size = 0;

+    for (uint32_t i = 0; i < content_encoding_entries_size_; ++i) {

+      ContentEncoding* const encoding = content_encoding_entries_[i];

+      content_encodings_size += encoding->Size();

+    }

+    if (!WriteEbmlMasterElement(writer, libwebm::kMkvContentEncodings,

+                                content_encodings_size))

+      return false;

+    for (uint32_t i = 0; i < content_encoding_entries_size_; ++i) {

+      ContentEncoding* const encoding = content_encoding_entries_[i];

+      if (!encoding->Write(writer))

+        return false;

+    }

+  }

+  stop_position = writer->Position();

+  if (stop_position < 0)

+    return false;

+  return true;

+}

+bool Track::SetCodecPrivate(const uint8_t* codec_private, uint64_t length) {

+  if (!codec_private || length < 1)

+    return false;

+  delete[] codec_private_;

+  codec_private_ =

+      new (std::nothrow) uint8_t[static_cast<size_t>(length)];  // NOLINT

+  if (!codec_private_)

+    return false;

+  memcpy(codec_private_, codec_private, static_cast<size_t>(length));

+  codec_private_length_ = length;

+  return true;

+}

+void Track::set_codec_id(const char* codec_id) {

+  if (codec_id) {

+    delete[] codec_id_;

+    const size_t length = strlen(codec_id) + 1;

+    codec_id_ = new (std::nothrow) char[length];  // NOLINT

+    if (codec_id_) {

+#ifdef _MSC_VER

+      strcpy_s(codec_id_, length, codec_id);

+#else

+      strcpy(codec_id_, codec_id);

+#endif

+    }

+  }

+}

+// TODO(fgalligan): Vet the language parameter.

+void Track::set_language(const char* language) {

+  if (language) {

+    delete[] language_;

+    const size_t length = strlen(language) + 1;

+    language_ = new (std::nothrow) char[length];  // NOLINT

+    if (language_) {

+#ifdef _MSC_VER

+      strcpy_s(language_, length, language);

+#else

+      strcpy(language_, language);

+#endif

+    }

+  }

+}

+void Track::set_name(const char* name) {

+  if (name) {

+    delete[] name_;

+    const size_t length = strlen(name) + 1;

+    name_ = new (std::nothrow) char[length];  // NOLINT

+    if (name_) {

+#ifdef _MSC_VER

+      strcpy_s(name_, length, name);

+#else

+      strcpy(name_, name);

+#endif

+    }

+  }

+}

+///////////////////////////////////////////////////////////////

+//

+// Colour and its child elements

+uint64_t PrimaryChromaticity::PrimaryChromaticityPayloadSize(

+    libwebm::MkvId x_id, libwebm::MkvId y_id) const {

+  return EbmlElementSize(x_id, x) + EbmlElementSize(y_id, y);

+}

+bool PrimaryChromaticity::Write(IMkvWriter* writer, libwebm::MkvId x_id,

+                                libwebm::MkvId y_id) const {

+  return WriteEbmlElement(writer, x_id, x) && WriteEbmlElement(writer, y_id, y);

+}

+uint64_t MasteringMetadata::MasteringMetadataSize() const {

+  uint64_t size = PayloadSize();

+  if (size > 0)

+    size += EbmlMasterElementSize(libwebm::kMkvMasteringMetadata, size);

+  return size;

+}

+bool MasteringMetadata::Write(IMkvWriter* writer) const {

+  const uint64_t size = PayloadSize();

+  // Don't write an empty element.

+  if (size == 0)

+    return true;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvMasteringMetadata, size))

+    return false;

+  if (luminance_max != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvLuminanceMax, luminance_max)) {

+    return false;

+  }

+  if (luminance_min != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvLuminanceMin, luminance_min)) {

+    return false;

+  }

+  if (r_ &&

+      !r_->Write(writer, libwebm::kMkvPrimaryRChromaticityX,

+                 libwebm::kMkvPrimaryRChromaticityY)) {

+    return false;

+  }

+  if (g_ &&

+      !g_->Write(writer, libwebm::kMkvPrimaryGChromaticityX,

+                 libwebm::kMkvPrimaryGChromaticityY)) {

+    return false;

+  }

+  if (b_ &&

+      !b_->Write(writer, libwebm::kMkvPrimaryBChromaticityX,

+                 libwebm::kMkvPrimaryBChromaticityY)) {

+    return false;

+  }

+  if (white_point_ &&

+      !white_point_->Write(writer, libwebm::kMkvWhitePointChromaticityX,

+                           libwebm::kMkvWhitePointChromaticityY)) {

+    return false;

+  }

+  return true;

+}

+bool MasteringMetadata::SetChromaticity(

+    const PrimaryChromaticity* r, const PrimaryChromaticity* g,

+    const PrimaryChromaticity* b, const PrimaryChromaticity* white_point) {

+  PrimaryChromaticityPtr r_ptr(NULL);

+  if (r) {

+    if (!CopyChromaticity(r, &r_ptr))

+      return false;

+  }

+  PrimaryChromaticityPtr g_ptr(NULL);

+  if (g) {

+    if (!CopyChromaticity(g, &g_ptr))

+      return false;

+  }

+  PrimaryChromaticityPtr b_ptr(NULL);

+  if (b) {

+    if (!CopyChromaticity(b, &b_ptr))

+      return false;

+  }

+  PrimaryChromaticityPtr wp_ptr(NULL);

+  if (white_point) {

+    if (!CopyChromaticity(white_point, &wp_ptr))

+      return false;

+  }

+  r_ = r_ptr.release();

+  g_ = g_ptr.release();

+  b_ = b_ptr.release();

+  white_point_ = wp_ptr.release();

+  return true;

+}

+uint64_t MasteringMetadata::PayloadSize() const {

+  uint64_t size = 0;

+  if (luminance_max != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvLuminanceMax, luminance_max);

+  if (luminance_min != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvLuminanceMin, luminance_min);

+  if (r_) {

+    size += r_->PrimaryChromaticityPayloadSize(

+        libwebm::kMkvPrimaryRChromaticityX, libwebm::kMkvPrimaryRChromaticityY);

+  }

+  if (g_) {

+    size += g_->PrimaryChromaticityPayloadSize(

+        libwebm::kMkvPrimaryGChromaticityX, libwebm::kMkvPrimaryGChromaticityY);

+  }

+  if (b_) {

+    size += b_->PrimaryChromaticityPayloadSize(

+        libwebm::kMkvPrimaryBChromaticityX, libwebm::kMkvPrimaryBChromaticityY);

+  }

+  if (white_point_) {

+    size += white_point_->PrimaryChromaticityPayloadSize(

+        libwebm::kMkvWhitePointChromaticityX,

+        libwebm::kMkvWhitePointChromaticityY);

+  }

+  return size;

+}

+uint64_t Colour::ColourSize() const {

+  uint64_t size = PayloadSize();

+  if (size > 0)

+    size += EbmlMasterElementSize(libwebm::kMkvColour, size);

+  return size;

+}

+bool Colour::Write(IMkvWriter* writer) const {

+  const uint64_t size = PayloadSize();

+  // Don't write an empty element.

+  if (size == 0)

+    return true;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvColour, size))

+    return false;

+  if (matrix_coefficients != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvMatrixCoefficients,

+                        matrix_coefficients)) {

+    return false;

+  }

+  if (bits_per_channel != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvBitsPerChannel,

+                        bits_per_channel)) {

+    return false;

+  }

+  if (chroma_subsampling_horz != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvChromaSubsamplingHorz,

+                        chroma_subsampling_horz)) {

+    return false;

+  }

+  if (chroma_subsampling_vert != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvChromaSubsamplingVert,

+                        chroma_subsampling_vert)) {

+    return false;

+  }

+  if (cb_subsampling_horz != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvCbSubsamplingHorz,

+                        cb_subsampling_horz)) {

+    return false;

+  }

+  if (cb_subsampling_vert != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvCbSubsamplingVert,

+                        cb_subsampling_vert)) {

+    return false;

+  }

+  if (chroma_siting_horz != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvChromaSitingHorz,

+                        chroma_siting_horz)) {

+    return false;

+  }

+  if (chroma_siting_vert != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvChromaSitingVert,

+                        chroma_siting_vert)) {

+    return false;

+  }

+  if (range != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvRange, range)) {

+    return false;

+  }

+  if (transfer_characteristics != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvTransferCharacteristics,

+                        transfer_characteristics)) {

+    return false;

+  }

+  if (primaries != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvPrimaries, primaries)) {

+    return false;

+  }

+  if (max_cll != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvMaxCLL, max_cll)) {

+    return false;

+  }

+  if (max_fall != kValueNotPresent &&

+      !WriteEbmlElement(writer, libwebm::kMkvMaxFALL, max_fall)) {

+    return false;

+  }

+  if (mastering_metadata_ && !mastering_metadata_->Write(writer))

+    return false;

+  return true;

+}

+bool Colour::SetMasteringMetadata(const MasteringMetadata& mastering_metadata) {

+  std::auto_ptr<MasteringMetadata> mm_ptr(new MasteringMetadata());

+  if (!mm_ptr.get())

+    return false;

+  mm_ptr->luminance_max = mastering_metadata.luminance_max;

+  mm_ptr->luminance_min = mastering_metadata.luminance_min;

+  if (!mm_ptr->SetChromaticity(mastering_metadata.r(), mastering_metadata.g(),

+                               mastering_metadata.b(),

+                               mastering_metadata.white_point())) {

+    return false;

+  }

+  delete mastering_metadata_;

+  mastering_metadata_ = mm_ptr.release();

+  return true;

+}

+uint64_t Colour::PayloadSize() const {

+  uint64_t size = 0;

+  if (matrix_coefficients != kValueNotPresent)

+    size +=

+        EbmlElementSize(libwebm::kMkvMatrixCoefficients, matrix_coefficients);

+  if (bits_per_channel != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvBitsPerChannel, bits_per_channel);

+  if (chroma_subsampling_horz != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvChromaSubsamplingHorz,

+                            chroma_subsampling_horz);

+  if (chroma_subsampling_vert != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvChromaSubsamplingVert,

+                            chroma_subsampling_vert);

+  if (cb_subsampling_horz != kValueNotPresent)

+    size +=

+        EbmlElementSize(libwebm::kMkvCbSubsamplingHorz, cb_subsampling_horz);

+  if (cb_subsampling_vert != kValueNotPresent)

+    size +=

+        EbmlElementSize(libwebm::kMkvCbSubsamplingVert, cb_subsampling_vert);

+  if (chroma_siting_horz != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvChromaSitingHorz, chroma_siting_horz);

+  if (chroma_siting_vert != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvChromaSitingVert, chroma_siting_vert);

+  if (range != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvRange, range);

+  if (transfer_characteristics != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvTransferCharacteristics,

+                            transfer_characteristics);

+  if (primaries != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvPrimaries, primaries);

+  if (max_cll != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvMaxCLL, max_cll);

+  if (max_fall != kValueNotPresent)

+    size += EbmlElementSize(libwebm::kMkvMaxFALL, max_fall);

+  if (mastering_metadata_)

+    size += mastering_metadata_->MasteringMetadataSize();

+  return size;

+}

+///////////////////////////////////////////////////////////////

+//

+// VideoTrack Class

+VideoTrack::VideoTrack(unsigned int* seed)

+    : Track(seed),

+      display_height_(0),

+      display_width_(0),

+      crop_left_(0),

+      crop_right_(0),

+      crop_top_(0),

+      crop_bottom_(0),

+      frame_rate_(0.0),

+      height_(0),

+      stereo_mode_(0),

+      alpha_mode_(0),

+      width_(0),

+      colour_(NULL) {}

+VideoTrack::~VideoTrack() { delete colour_; }

+bool VideoTrack::SetStereoMode(uint64_t stereo_mode) {

+  if (stereo_mode != kMono && stereo_mode != kSideBySideLeftIsFirst &&

+      stereo_mode != kTopBottomRightIsFirst &&

+      stereo_mode != kTopBottomLeftIsFirst &&

+      stereo_mode != kSideBySideRightIsFirst)

+    return false;

+  stereo_mode_ = stereo_mode;

+  return true;

+}

+bool VideoTrack::SetAlphaMode(uint64_t alpha_mode) {

+  if (alpha_mode != kNoAlpha && alpha_mode != kAlpha)

+    return false;

+  alpha_mode_ = alpha_mode;

+  return true;

+}

+uint64_t VideoTrack::PayloadSize() const {

+  const uint64_t parent_size = Track::PayloadSize();

+  uint64_t size = VideoPayloadSize();

+  size += EbmlMasterElementSize(libwebm::kMkvVideo, size);

+  return parent_size + size;

+}

+bool VideoTrack::Write(IMkvWriter* writer) const {

+  if (!Track::Write(writer))

+    return false;

+  const uint64_t size = VideoPayloadSize();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvVideo, size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvPixelWidth, width_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvPixelHeight, height_))

+    return false;

+  if (display_width_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvDisplayWidth, display_width_))

+      return false;

+  }

+  if (display_height_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvDisplayHeight, display_height_))

+      return false;

+  }

+  if (crop_left_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvPixelCropLeft, crop_left_))

+      return false;

+  }

+  if (crop_right_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvPixelCropRight, crop_right_))

+      return false;

+  }

+  if (crop_top_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvPixelCropTop, crop_top_))

+      return false;

+  }

+  if (crop_bottom_ > 0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvPixelCropBottom, crop_bottom_))

+      return false;

+  }

+  if (stereo_mode_ > kMono) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvStereoMode, stereo_mode_))

+      return false;

+  }

+  if (alpha_mode_ > kNoAlpha) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvAlphaMode, alpha_mode_))

+      return false;

+  }

+  if (frame_rate_ > 0.0) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvFrameRate,

+                          static_cast<float>(frame_rate_))) {

+      return false;

+    }

+  }

+  if (colour_) {

+    if (!colour_->Write(writer))

+      return false;

+  }

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size)) {

+    return false;

+  }

+  return true;

+}

+bool VideoTrack::SetColour(const Colour& colour) {

+  std::auto_ptr<Colour> colour_ptr(new Colour());

+  if (!colour_ptr.get())

+    return false;

+  if (colour.mastering_metadata()) {

+    if (!colour_ptr->SetMasteringMetadata(*colour.mastering_metadata()))

+      return false;

+  }

+  colour_ptr->matrix_coefficients = colour.matrix_coefficients;

+  colour_ptr->bits_per_channel = colour.bits_per_channel;

+  colour_ptr->chroma_subsampling_horz = colour.chroma_subsampling_horz;

+  colour_ptr->chroma_subsampling_vert = colour.chroma_subsampling_vert;

+  colour_ptr->cb_subsampling_horz = colour.cb_subsampling_horz;

+  colour_ptr->cb_subsampling_vert = colour.cb_subsampling_vert;

+  colour_ptr->chroma_siting_horz = colour.chroma_siting_horz;

+  colour_ptr->chroma_siting_vert = colour.chroma_siting_vert;

+  colour_ptr->range = colour.range;

+  colour_ptr->transfer_characteristics = colour.transfer_characteristics;

+  colour_ptr->primaries = colour.primaries;

+  colour_ptr->max_cll = colour.max_cll;

+  colour_ptr->max_fall = colour.max_fall;

+  colour_ = colour_ptr.release();

+  return true;

+}

+uint64_t VideoTrack::VideoPayloadSize() const {

+  uint64_t size = EbmlElementSize(libwebm::kMkvPixelWidth, width_);

+  size += EbmlElementSize(libwebm::kMkvPixelHeight, height_);

+  if (display_width_ > 0)

+    size += EbmlElementSize(libwebm::kMkvDisplayWidth, display_width_);

+  if (display_height_ > 0)

+    size += EbmlElementSize(libwebm::kMkvDisplayHeight, display_height_);

+  if (crop_left_ > 0)

+    size += EbmlElementSize(libwebm::kMkvPixelCropLeft, crop_left_);

+  if (crop_right_ > 0)

+    size += EbmlElementSize(libwebm::kMkvPixelCropRight, crop_right_);

+  if (crop_top_ > 0)

+    size += EbmlElementSize(libwebm::kMkvPixelCropTop, crop_top_);

+  if (crop_bottom_ > 0)

+    size += EbmlElementSize(libwebm::kMkvPixelCropBottom, crop_bottom_);

+  if (stereo_mode_ > kMono)

+    size += EbmlElementSize(libwebm::kMkvStereoMode, stereo_mode_);

+  if (alpha_mode_ > kNoAlpha)

+    size += EbmlElementSize(libwebm::kMkvAlphaMode, alpha_mode_);

+  if (frame_rate_ > 0.0)

+    size += EbmlElementSize(libwebm::kMkvFrameRate,

+                            static_cast<float>(frame_rate_));

+  if (colour_)

+    size += colour_->ColourSize();

+  return size;

+}

+///////////////////////////////////////////////////////////////

+//

+// AudioTrack Class

+AudioTrack::AudioTrack(unsigned int* seed)

+    : Track(seed), bit_depth_(0), channels_(1), sample_rate_(0.0) {}

+AudioTrack::~AudioTrack() {}

+uint64_t AudioTrack::PayloadSize() const {

+  const uint64_t parent_size = Track::PayloadSize();

+  uint64_t size = EbmlElementSize(libwebm::kMkvSamplingFrequency,

+                                  static_cast<float>(sample_rate_));

+  size += EbmlElementSize(libwebm::kMkvChannels, channels_);

+  if (bit_depth_ > 0)

+    size += EbmlElementSize(libwebm::kMkvBitDepth, bit_depth_);

+  size += EbmlMasterElementSize(libwebm::kMkvAudio, size);

+  return parent_size + size;

+}

+bool AudioTrack::Write(IMkvWriter* writer) const {

+  if (!Track::Write(writer))

+    return false;

+  // Calculate AudioSettings size.

+  uint64_t size = EbmlElementSize(libwebm::kMkvSamplingFrequency,

+                                  static_cast<float>(sample_rate_));

+  size += EbmlElementSize(libwebm::kMkvChannels, channels_);

+  if (bit_depth_ > 0)

+    size += EbmlElementSize(libwebm::kMkvBitDepth, bit_depth_);

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvAudio, size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvSamplingFrequency,

+                        static_cast<float>(sample_rate_)))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChannels, channels_))

+    return false;

+  if (bit_depth_ > 0)

+    if (!WriteEbmlElement(writer, libwebm::kMkvBitDepth, bit_depth_))

+      return false;

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// Tracks Class

+const char Tracks::kOpusCodecId[] = "A_OPUS";

+const char Tracks::kVorbisCodecId[] = "A_VORBIS";

+const char Tracks::kVp8CodecId[] = "V_VP8";

+const char Tracks::kVp9CodecId[] = "V_VP9";

+const char Tracks::kVp10CodecId[] = "V_VP10";

+Tracks::Tracks()

+    : track_entries_(NULL), track_entries_size_(0), wrote_tracks_(false) {}

+Tracks::~Tracks() {

+  if (track_entries_) {

+    for (uint32_t i = 0; i < track_entries_size_; ++i) {

+      Track* const track = track_entries_[i];

+      delete track;

+    }

+    delete[] track_entries_;

+  }

+}

+bool Tracks::AddTrack(Track* track, int32_t number) {

+  if (number < 0 || wrote_tracks_)

+    return false;

+  // This muxer only supports track numbers in the range [1, 126], in

+  // order to be able (to use Matroska integer representation) to

+  // serialize the block header (of which the track number is a part)

+  // for a frame using exactly 4 bytes.

+  if (number > 0x7E)

+    return false;

+  uint32_t track_num = number;

+  if (track_num > 0) {

+    // Check to make sure a track does not already have |track_num|.

+    for (uint32_t i = 0; i < track_entries_size_; ++i) {

+      if (track_entries_[i]->number() == track_num)

+        return false;

+    }

+  }

+  const uint32_t count = track_entries_size_ + 1;

+  Track** const track_entries = new (std::nothrow) Track*[count];  // NOLINT

+  if (!track_entries)

+    return false;

+  for (uint32_t i = 0; i < track_entries_size_; ++i) {

+    track_entries[i] = track_entries_[i];

+  }

+  delete[] track_entries_;

+  // Find the lowest availible track number > 0.

+  if (track_num == 0) {

+    track_num = count;

+    // Check to make sure a track does not already have |track_num|.

+    bool exit = false;

+    do {

+      exit = true;

+      for (uint32_t i = 0; i < track_entries_size_; ++i) {

+        if (track_entries[i]->number() == track_num) {

+          track_num++;

+          exit = false;

+          break;

+        }

+      }

+    } while (!exit);

+  }

+  track->set_number(track_num);

+  track_entries_ = track_entries;

+  track_entries_[track_entries_size_] = track;

+  track_entries_size_ = count;

+  return true;

+}

+const Track* Tracks::GetTrackByIndex(uint32_t index) const {

+  if (track_entries_ == NULL)

+    return NULL;

+  if (index >= track_entries_size_)

+    return NULL;

+  return track_entries_[index];

+}

+Track* Tracks::GetTrackByNumber(uint64_t track_number) const {

+  const int32_t count = track_entries_size();

+  for (int32_t i = 0; i < count; ++i) {

+    if (track_entries_[i]->number() == track_number)

+      return track_entries_[i];

+  }

+  return NULL;

+}

+bool Tracks::TrackIsAudio(uint64_t track_number) const {

+  const Track* const track = GetTrackByNumber(track_number);

+  if (track->type() == kAudio)

+    return true;

+  return false;

+}

+bool Tracks::TrackIsVideo(uint64_t track_number) const {

+  const Track* const track = GetTrackByNumber(track_number);

+  if (track->type() == kVideo)

+    return true;

+  return false;

+}

+bool Tracks::Write(IMkvWriter* writer) const {

+  uint64_t size = 0;

+  const int32_t count = track_entries_size();

+  for (int32_t i = 0; i < count; ++i) {

+    const Track* const track = GetTrackByIndex(i);

+    if (!track)

+      return false;

+    size += track->Size();

+  }

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvTracks, size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  for (int32_t i = 0; i < count; ++i) {

+    const Track* const track = GetTrackByIndex(i);

+    if (!track->Write(writer))

+      return false;

+  }

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  wrote_tracks_ = true;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// Chapter Class

+bool Chapter::set_id(const char* id) { return StrCpy(id, &id_); }

+void Chapter::set_time(const Segment& segment, uint64_t start_ns,

+                       uint64_t end_ns) {

+  const SegmentInfo* const info = segment.GetSegmentInfo();

+  const uint64_t timecode_scale = info->timecode_scale();

+  start_timecode_ = start_ns / timecode_scale;

+  end_timecode_ = end_ns / timecode_scale;

+}

+bool Chapter::add_string(const char* title, const char* language,

+                         const char* country) {

+  if (!ExpandDisplaysArray())

+    return false;

+  Display& d = displays_[displays_count_++];

+  d.Init();

+  if (!d.set_title(title))

+    return false;

+  if (!d.set_language(language))

+    return false;

+  if (!d.set_country(country))

+    return false;

+  return true;

+}

+Chapter::Chapter() {

+  // This ctor only constructs the object.  Proper initialization is

+  // done in Init() (called in Chapters::AddChapter()).  The only

+  // reason we bother implementing this ctor is because we had to

+  // declare it as private (along with the dtor), in order to prevent

+  // clients from creating Chapter instances (a privelege we grant

+  // only to the Chapters class).  Doing no initialization here also

+  // means that creating arrays of chapter objects is more efficient,

+  // because we only initialize each new chapter object as it becomes

+  // active on the array.

+}

+Chapter::~Chapter() {}

+void Chapter::Init(unsigned int* seed) {

+  id_ = NULL;

+  start_timecode_ = 0;

+  end_timecode_ = 0;

+  displays_ = NULL;

+  displays_size_ = 0;

+  displays_count_ = 0;

+  uid_ = MakeUID(seed);

+}

+void Chapter::ShallowCopy(Chapter* dst) const {

+  dst->id_ = id_;

+  dst->start_timecode_ = start_timecode_;

+  dst->end_timecode_ = end_timecode_;

+  dst->uid_ = uid_;

+  dst->displays_ = displays_;

+  dst->displays_size_ = displays_size_;

+  dst->displays_count_ = displays_count_;

+}

+void Chapter::Clear() {

+  StrCpy(NULL, &id_);

+  while (displays_count_ > 0) {

+    Display& d = displays_[--displays_count_];

+    d.Clear();

+  }

+  delete[] displays_;

+  displays_ = NULL;

+  displays_size_ = 0;

+}

+bool Chapter::ExpandDisplaysArray() {

+  if (displays_size_ > displays_count_)

+    return true;  // nothing to do yet

+  const int size = (displays_size_ == 0) ? 1 : 2 * displays_size_;

+  Display* const displays = new (std::nothrow) Display[size];  // NOLINT

+  if (displays == NULL)

+    return false;

+  for (int idx = 0; idx < displays_count_; ++idx) {

+    displays[idx] = displays_[idx];  // shallow copy

+  }

+  delete[] displays_;

+  displays_ = displays;

+  displays_size_ = size;

+  return true;

+}

+uint64_t Chapter::WriteAtom(IMkvWriter* writer) const {

+  uint64_t payload_size =

+      EbmlElementSize(libwebm::kMkvChapterStringUID, id_) +

+      EbmlElementSize(libwebm::kMkvChapterUID, uid_) +

+      EbmlElementSize(libwebm::kMkvChapterTimeStart, start_timecode_) +

+      EbmlElementSize(libwebm::kMkvChapterTimeEnd, end_timecode_);

+  for (int idx = 0; idx < displays_count_; ++idx) {

+    const Display& d = displays_[idx];

+    payload_size += d.WriteDisplay(NULL);

+  }

+  const uint64_t atom_size =

+      EbmlMasterElementSize(libwebm::kMkvChapterAtom, payload_size) +

+      payload_size;

+  if (writer == NULL)

+    return atom_size;

+  const int64_t start = writer->Position();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvChapterAtom, payload_size))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChapterStringUID, id_))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChapterUID, uid_))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChapterTimeStart, start_timecode_))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChapterTimeEnd, end_timecode_))

+    return 0;

+  for (int idx = 0; idx < displays_count_; ++idx) {

+    const Display& d = displays_[idx];

+    if (!d.WriteDisplay(writer))

+      return 0;

+  }

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != atom_size)

+    return 0;

+  return atom_size;

+}

+void Chapter::Display::Init() {

+  title_ = NULL;

+  language_ = NULL;

+  country_ = NULL;

+}

+void Chapter::Display::Clear() {

+  StrCpy(NULL, &title_);

+  StrCpy(NULL, &language_);

+  StrCpy(NULL, &country_);

+}

+bool Chapter::Display::set_title(const char* title) {

+  return StrCpy(title, &title_);

+}

+bool Chapter::Display::set_language(const char* language) {

+  return StrCpy(language, &language_);

+}

+bool Chapter::Display::set_country(const char* country) {

+  return StrCpy(country, &country_);

+}

+uint64_t Chapter::Display::WriteDisplay(IMkvWriter* writer) const {

+  uint64_t payload_size = EbmlElementSize(libwebm::kMkvChapString, title_);

+  if (language_)

+    payload_size += EbmlElementSize(libwebm::kMkvChapLanguage, language_);

+  if (country_)

+    payload_size += EbmlElementSize(libwebm::kMkvChapCountry, country_);

+  const uint64_t display_size =

+      EbmlMasterElementSize(libwebm::kMkvChapterDisplay, payload_size) +

+      payload_size;

+  if (writer == NULL)

+    return display_size;

+  const int64_t start = writer->Position();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvChapterDisplay,

+                              payload_size))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvChapString, title_))

+    return 0;

+  if (language_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvChapLanguage, language_))

+      return 0;

+  }

+  if (country_) {

+    if (!WriteEbmlElement(writer, libwebm::kMkvChapCountry, country_))

+      return 0;

+  }

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != display_size)

+    return 0;

+  return display_size;

+}

+///////////////////////////////////////////////////////////////

+//

+// Chapters Class

+Chapters::Chapters() : chapters_size_(0), chapters_count_(0), chapters_(NULL) {}

+Chapters::~Chapters() {

+  while (chapters_count_ > 0) {

+    Chapter& chapter = chapters_[--chapters_count_];

+    chapter.Clear();

+  }

+  delete[] chapters_;

+  chapters_ = NULL;

+}

+int Chapters::Count() const { return chapters_count_; }

+Chapter* Chapters::AddChapter(unsigned int* seed) {

+  if (!ExpandChaptersArray())

+    return NULL;

+  Chapter& chapter = chapters_[chapters_count_++];

+  chapter.Init(seed);

+  return &chapter;

+}

+bool Chapters::Write(IMkvWriter* writer) const {

+  if (writer == NULL)

+    return false;

+  const uint64_t payload_size = WriteEdition(NULL);  // return size only

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvChapters, payload_size))

+    return false;

+  const int64_t start = writer->Position();

+  if (WriteEdition(writer) == 0)  // error

+    return false;

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != payload_size)

+    return false;

+  return true;

+}

+bool Chapters::ExpandChaptersArray() {

+  if (chapters_size_ > chapters_count_)

+    return true;  // nothing to do yet

+  const int size = (chapters_size_ == 0) ? 1 : 2 * chapters_size_;

+  Chapter* const chapters = new (std::nothrow) Chapter[size];  // NOLINT

+  if (chapters == NULL)

+    return false;

+  for (int idx = 0; idx < chapters_count_; ++idx) {

+    const Chapter& src = chapters_[idx];

+    Chapter* const dst = chapters + idx;

+    src.ShallowCopy(dst);

+  }

+  delete[] chapters_;

+  chapters_ = chapters;

+  chapters_size_ = size;

+  return true;

+}

+uint64_t Chapters::WriteEdition(IMkvWriter* writer) const {

+  uint64_t payload_size = 0;

+  for (int idx = 0; idx < chapters_count_; ++idx) {

+    const Chapter& chapter = chapters_[idx];

+    payload_size += chapter.WriteAtom(NULL);

+  }

+  const uint64_t edition_size =

+      EbmlMasterElementSize(libwebm::kMkvEditionEntry, payload_size) +

+      payload_size;

+  if (writer == NULL)  // return size only

+    return edition_size;

+  const int64_t start = writer->Position();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvEditionEntry, payload_size))

+    return 0;  // error

+  for (int idx = 0; idx < chapters_count_; ++idx) {

+    const Chapter& chapter = chapters_[idx];

+    const uint64_t chapter_size = chapter.WriteAtom(writer);

+    if (chapter_size == 0)  // error

+      return 0;

+  }

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != edition_size)

+    return 0;

+  return edition_size;

+}

+// Tag Class

+bool Tag::add_simple_tag(const char* tag_name, const char* tag_string) {

+  if (!ExpandSimpleTagsArray())

+    return false;

+  SimpleTag& st = simple_tags_[simple_tags_count_++];

+  st.Init();

+  if (!st.set_tag_name(tag_name))

+    return false;

+  if (!st.set_tag_string(tag_string))

+    return false;

+  return true;

+}

+Tag::Tag() {

+  simple_tags_ = NULL;

+  simple_tags_size_ = 0;

+  simple_tags_count_ = 0;

+}

+Tag::~Tag() {}

+void Tag::ShallowCopy(Tag* dst) const {

+  dst->simple_tags_ = simple_tags_;

+  dst->simple_tags_size_ = simple_tags_size_;

+  dst->simple_tags_count_ = simple_tags_count_;

+}

+void Tag::Clear() {

+  while (simple_tags_count_ > 0) {

+    SimpleTag& st = simple_tags_[--simple_tags_count_];

+    st.Clear();

+  }

+  delete[] simple_tags_;

+  simple_tags_ = NULL;

+  simple_tags_size_ = 0;

+}

+bool Tag::ExpandSimpleTagsArray() {

+  if (simple_tags_size_ > simple_tags_count_)

+    return true;  // nothing to do yet

+  const int size = (simple_tags_size_ == 0) ? 1 : 2 * simple_tags_size_;

+  SimpleTag* const simple_tags = new (std::nothrow) SimpleTag[size];  // NOLINT

+  if (simple_tags == NULL)

+    return false;

+  for (int idx = 0; idx < simple_tags_count_; ++idx) {

+    simple_tags[idx] = simple_tags_[idx];  // shallow copy

+  }

+  delete[] simple_tags_;

+  simple_tags_ = simple_tags;

+  simple_tags_size_ = size;

+  return true;

+}

+uint64_t Tag::Write(IMkvWriter* writer) const {

+  uint64_t payload_size = 0;

+  for (int idx = 0; idx < simple_tags_count_; ++idx) {

+    const SimpleTag& st = simple_tags_[idx];

+    payload_size += st.Write(NULL);

+  }

+  const uint64_t tag_size =

+      EbmlMasterElementSize(libwebm::kMkvTag, payload_size) + payload_size;

+  if (writer == NULL)

+    return tag_size;

+  const int64_t start = writer->Position();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvTag, payload_size))

+    return 0;

+  for (int idx = 0; idx < simple_tags_count_; ++idx) {

+    const SimpleTag& st = simple_tags_[idx];

+    if (!st.Write(writer))

+      return 0;

+  }

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != tag_size)

+    return 0;

+  return tag_size;

+}

+// Tag::SimpleTag

+void Tag::SimpleTag::Init() {

+  tag_name_ = NULL;

+  tag_string_ = NULL;

+}

+void Tag::SimpleTag::Clear() {

+  StrCpy(NULL, &tag_name_);

+  StrCpy(NULL, &tag_string_);

+}

+bool Tag::SimpleTag::set_tag_name(const char* tag_name) {

+  return StrCpy(tag_name, &tag_name_);

+}

+bool Tag::SimpleTag::set_tag_string(const char* tag_string) {

+  return StrCpy(tag_string, &tag_string_);

+}

+uint64_t Tag::SimpleTag::Write(IMkvWriter* writer) const {

+  uint64_t payload_size = EbmlElementSize(libwebm::kMkvTagName, tag_name_);

+  payload_size += EbmlElementSize(libwebm::kMkvTagString, tag_string_);

+  const uint64_t simple_tag_size =

+      EbmlMasterElementSize(libwebm::kMkvSimpleTag, payload_size) +

+      payload_size;

+  if (writer == NULL)

+    return simple_tag_size;

+  const int64_t start = writer->Position();

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvSimpleTag, payload_size))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTagName, tag_name_))

+    return 0;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTagString, tag_string_))

+    return 0;

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != simple_tag_size)

+    return 0;

+  return simple_tag_size;

+}

+// Tags Class

+Tags::Tags() : tags_size_(0), tags_count_(0), tags_(NULL) {}

+Tags::~Tags() {

+  while (tags_count_ > 0) {

+    Tag& tag = tags_[--tags_count_];

+    tag.Clear();

+  }

+  delete[] tags_;

+  tags_ = NULL;

+}

+int Tags::Count() const { return tags_count_; }

+Tag* Tags::AddTag() {

+  if (!ExpandTagsArray())

+    return NULL;

+  Tag& tag = tags_[tags_count_++];

+  return &tag;

+}

+bool Tags::Write(IMkvWriter* writer) const {

+  if (writer == NULL)

+    return false;

+  uint64_t payload_size = 0;

+  for (int idx = 0; idx < tags_count_; ++idx) {

+    const Tag& tag = tags_[idx];

+    payload_size += tag.Write(NULL);

+  }

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvTags, payload_size))

+    return false;

+  const int64_t start = writer->Position();

+  for (int idx = 0; idx < tags_count_; ++idx) {

+    const Tag& tag = tags_[idx];

+    const uint64_t tag_size = tag.Write(writer);

+    if (tag_size == 0)  // error

+      return 0;

+  }

+  const int64_t stop = writer->Position();

+  if (stop >= start && uint64_t(stop - start) != payload_size)

+    return false;

+  return true;

+}

+bool Tags::ExpandTagsArray() {

+  if (tags_size_ > tags_count_)

+    return true;  // nothing to do yet

+  const int size = (tags_size_ == 0) ? 1 : 2 * tags_size_;

+  Tag* const tags = new (std::nothrow) Tag[size];  // NOLINT

+  if (tags == NULL)

+    return false;

+  for (int idx = 0; idx < tags_count_; ++idx) {

+    const Tag& src = tags_[idx];

+    Tag* const dst = tags + idx;

+    src.ShallowCopy(dst);

+  }

+  delete[] tags_;

+  tags_ = tags;

+  tags_size_ = size;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// Cluster class

+Cluster::Cluster(uint64_t timecode, int64_t cues_pos, uint64_t timecode_scale,

+                 bool write_last_frame_with_duration)

+    : blocks_added_(0),

+      finalized_(false),

+      header_written_(false),

+      payload_size_(0),

+      position_for_cues_(cues_pos),

+      size_position_(-1),

+      timecode_(timecode),

+      timecode_scale_(timecode_scale),

+      write_last_frame_with_duration_(write_last_frame_with_duration),

+      writer_(NULL) {}

+Cluster::~Cluster() {}

+bool Cluster::Init(IMkvWriter* ptr_writer) {

+  if (!ptr_writer) {

+    return false;

+  }

+  writer_ = ptr_writer;

+  return true;

+}

+bool Cluster::AddFrame(const Frame* const frame) {

+  return QueueOrWriteFrame(frame);

+}

+bool Cluster::AddFrame(const uint8_t* data, uint64_t length,

+                       uint64_t track_number, uint64_t abs_timecode,

+                       bool is_key) {

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_track_number(track_number);

+  frame.set_timestamp(abs_timecode);

+  frame.set_is_key(is_key);

+  return QueueOrWriteFrame(&frame);

+}

+bool Cluster::AddFrameWithAdditional(const uint8_t* data, uint64_t length,

+                                     const uint8_t* additional,

+                                     uint64_t additional_length,

+                                     uint64_t add_id, uint64_t track_number,

+                                     uint64_t abs_timecode, bool is_key) {

+  if (!additional || additional_length == 0) {

+    return false;

+  }

+  Frame frame;

+  if (!frame.Init(data, length) ||

+      !frame.AddAdditionalData(additional, additional_length, add_id)) {

+    return false;

+  }

+  frame.set_track_number(track_number);

+  frame.set_timestamp(abs_timecode);

+  frame.set_is_key(is_key);

+  return QueueOrWriteFrame(&frame);

+}

+bool Cluster::AddFrameWithDiscardPadding(const uint8_t* data, uint64_t length,

+                                         int64_t discard_padding,

+                                         uint64_t track_number,

+                                         uint64_t abs_timecode, bool is_key) {

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_discard_padding(discard_padding);

+  frame.set_track_number(track_number);

+  frame.set_timestamp(abs_timecode);

+  frame.set_is_key(is_key);

+  return QueueOrWriteFrame(&frame);

+}

+bool Cluster::AddMetadata(const uint8_t* data, uint64_t length,

+                          uint64_t track_number, uint64_t abs_timecode,

+                          uint64_t duration_timecode) {

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_track_number(track_number);

+  frame.set_timestamp(abs_timecode);

+  frame.set_duration(duration_timecode);

+  frame.set_is_key(true);  // All metadata blocks are keyframes.

+  return QueueOrWriteFrame(&frame);

+}

+void Cluster::AddPayloadSize(uint64_t size) { payload_size_ += size; }

+bool Cluster::Finalize() {

+  return !write_last_frame_with_duration_ && Finalize(false, 0);

+}

+bool Cluster::Finalize(bool set_last_frame_duration, uint64_t duration) {

+  if (!writer_ || finalized_)

+    return false;

+  if (write_last_frame_with_duration_) {

+    // Write out held back Frames. This essentially performs a k-way merge

+    // across all tracks in the increasing order of timestamps.

+    while (!stored_frames_.empty()) {

+      Frame* frame = stored_frames_.begin()->second.front();

+      // Get the next frame to write (frame with least timestamp across all

+      // tracks).

+      for (FrameMapIterator frames_iterator = ++stored_frames_.begin();

+           frames_iterator != stored_frames_.end(); ++frames_iterator) {

+        if (frames_iterator->second.front()->timestamp() < frame->timestamp()) {

+          frame = frames_iterator->second.front();

+        }

+      }

+      // Set the duration if it's the last frame for the track.

+      if (set_last_frame_duration &&

+          stored_frames_[frame->track_number()].size() == 1 &&

+          !frame->duration_set()) {

+        frame->set_duration(duration - frame->timestamp());

+        if (!frame->is_key() && !frame->reference_block_timestamp_set()) {

+          frame->set_reference_block_timestamp(

+              last_block_timestamp_[frame->track_number()]);

+        }

+      }

+      // Write the frame and remove it from |stored_frames_|.

+      const bool wrote_frame = DoWriteFrame(frame);

+      stored_frames_[frame->track_number()].pop_front();

+      if (stored_frames_[frame->track_number()].empty()) {

+        stored_frames_.erase(frame->track_number());

+      }

+      delete frame;

+      if (!wrote_frame)

+        return false;

+    }

+  }

+  if (size_position_ == -1)

+    return false;

+  if (writer_->Seekable()) {

+    const int64_t pos = writer_->Position();

+    if (writer_->Position(size_position_))

+      return false;

+    if (WriteUIntSize(writer_, payload_size(), 8))

+      return false;

+    if (writer_->Position(pos))

+      return false;

+  }

+  finalized_ = true;

+  return true;

+}

+uint64_t Cluster::Size() const {

+  const uint64_t element_size =

+      EbmlMasterElementSize(libwebm::kMkvCluster, 0xFFFFFFFFFFFFFFFFULL) +

+      payload_size_;

+  return element_size;

+}

+bool Cluster::PreWriteBlock() {

+  if (finalized_)

+    return false;

+  if (!header_written_) {

+    if (!WriteClusterHeader())

+      return false;

+  }

+  return true;

+}

+void Cluster::PostWriteBlock(uint64_t element_size) {

+  AddPayloadSize(element_size);

+  ++blocks_added_;

+}

+int64_t Cluster::GetRelativeTimecode(int64_t abs_timecode) const {

+  const int64_t cluster_timecode = this->Cluster::timecode();

+  const int64_t rel_timecode =

+      static_cast<int64_t>(abs_timecode) - cluster_timecode;

+  if (rel_timecode < 0 || rel_timecode > kMaxBlockTimecode)

+    return -1;

+  return rel_timecode;

+}

+bool Cluster::DoWriteFrame(const Frame* const frame) {

+  if (!frame || !frame->IsValid())

+    return false;

+  if (!PreWriteBlock())

+    return false;

+  const uint64_t element_size = WriteFrame(writer_, frame, this);

+  if (element_size == 0)

+    return false;

+  PostWriteBlock(element_size);

+  last_block_timestamp_[frame->track_number()] = frame->timestamp();

+  return true;

+}

+bool Cluster::QueueOrWriteFrame(const Frame* const frame) {

+  if (!frame || !frame->IsValid())

+    return false;

+  // If |write_last_frame_with_duration_| is not set, then write the frame right

+  // away.

+  if (!write_last_frame_with_duration_) {

+    return DoWriteFrame(frame);

+  }

+  // Queue the current frame.

+  uint64_t track_number = frame->track_number();

+  Frame* const frame_to_store = new Frame();

+  frame_to_store->CopyFrom(*frame);

+  stored_frames_[track_number].push_back(frame_to_store);

+  // Iterate through all queued frames in the current track except the last one

+  // and write it if it is okay to do so (i.e.) no other track has an held back

+  // frame with timestamp <= the timestamp of the frame in question.

+  std::vector<std::list<Frame*>::iterator> frames_to_erase;

+  for (std::list<Frame *>::iterator

+           current_track_iterator = stored_frames_[track_number].begin(),

+           end = --stored_frames_[track_number].end();

+       current_track_iterator != end; ++current_track_iterator) {

+    const Frame* const frame_to_write = *current_track_iterator;

+    bool okay_to_write = true;

+    for (FrameMapIterator track_iterator = stored_frames_.begin();

+         track_iterator != stored_frames_.end(); ++track_iterator) {

+      if (track_iterator->first == track_number) {

+        continue;

+      }

+      if (track_iterator->second.front()->timestamp() <

+          frame_to_write->timestamp()) {

+        okay_to_write = false;

+        break;

+      }

+    }

+    if (okay_to_write) {

+      const bool wrote_frame = DoWriteFrame(frame_to_write);

+      delete frame_to_write;

+      if (!wrote_frame)

+        return false;

+      frames_to_erase.push_back(current_track_iterator);

+    } else {

+      break;

+    }

+  }

+  for (std::vector<std::list<Frame*>::iterator>::iterator iterator =

+           frames_to_erase.begin();

+       iterator != frames_to_erase.end(); ++iterator) {

+    stored_frames_[track_number].erase(*iterator);

+  }

+  return true;

+}

+bool Cluster::WriteClusterHeader() {

+  if (finalized_)

+    return false;

+  if (WriteID(writer_, libwebm::kMkvCluster))

+    return false;

+  // Save for later.

+  size_position_ = writer_->Position();

+  // Write "unknown" (EBML coded -1) as cluster size value. We need to write 8

+  // bytes because we do not know how big our cluster will be.

+  if (SerializeInt(writer_, kEbmlUnknownValue, 8))

+    return false;

+  if (!WriteEbmlElement(writer_, libwebm::kMkvTimecode, timecode()))

+    return false;

+  AddPayloadSize(EbmlElementSize(libwebm::kMkvTimecode, timecode()));

+  header_written_ = true;

+  return true;

+}

+///////////////////////////////////////////////////////////////

+//

+// SeekHead Class

+SeekHead::SeekHead() : start_pos_(0ULL) {

+  for (int32_t i = 0; i < kSeekEntryCount; ++i) {

+    seek_entry_id_[i] = 0;

+    seek_entry_pos_[i] = 0;

+  }

+}

+SeekHead::~SeekHead() {}

+bool SeekHead::Finalize(IMkvWriter* writer) const {

+  if (writer->Seekable()) {

+    if (start_pos_ == -1)

+      return false;

+    uint64_t payload_size = 0;

+    uint64_t entry_size[kSeekEntryCount];

+    for (int32_t i = 0; i < kSeekEntryCount; ++i) {

+      if (seek_entry_id_[i] != 0) {

+        entry_size[i] = EbmlElementSize(

+            libwebm::kMkvSeekID, static_cast<uint64_t>(seek_entry_id_[i]));

+        entry_size[i] +=

+            EbmlElementSize(libwebm::kMkvSeekPosition, seek_entry_pos_[i]);

+        payload_size +=

+            EbmlMasterElementSize(libwebm::kMkvSeek, entry_size[i]) +

+            entry_size[i];

+      }

+    }

+    // No SeekHead elements

+    if (payload_size == 0)

+      return true;

+    const int64_t pos = writer->Position();

+    if (writer->Position(start_pos_))

+      return false;

+    if (!WriteEbmlMasterElement(writer, libwebm::kMkvSeekHead, payload_size))

+      return false;

+    for (int32_t i = 0; i < kSeekEntryCount; ++i) {

+      if (seek_entry_id_[i] != 0) {

+        if (!WriteEbmlMasterElement(writer, libwebm::kMkvSeek, entry_size[i]))

+          return false;

+        if (!WriteEbmlElement(writer, libwebm::kMkvSeekID,

+                              static_cast<uint64_t>(seek_entry_id_[i])))

+          return false;

+        if (!WriteEbmlElement(writer, libwebm::kMkvSeekPosition,

+                              seek_entry_pos_[i]))

+          return false;

+      }

+    }

+    const uint64_t total_entry_size = kSeekEntryCount * MaxEntrySize();

+    const uint64_t total_size =

+        EbmlMasterElementSize(libwebm::kMkvSeekHead, total_entry_size) +

+        total_entry_size;

+    const int64_t size_left = total_size - (writer->Position() - start_pos_);

+    const uint64_t bytes_written = WriteVoidElement(writer, size_left);

+    if (!bytes_written)

+      return false;

+    if (writer->Position(pos))

+      return false;

+  }

+  return true;

+}

+bool SeekHead::Write(IMkvWriter* writer) {

+  const uint64_t entry_size = kSeekEntryCount * MaxEntrySize();

+  const uint64_t size =

+      EbmlMasterElementSize(libwebm::kMkvSeekHead, entry_size);

+  start_pos_ = writer->Position();

+  const uint64_t bytes_written = WriteVoidElement(writer, size + entry_size);

+  if (!bytes_written)

+    return false;

+  return true;

+}

+bool SeekHead::AddSeekEntry(uint32_t id, uint64_t pos) {

+  for (int32_t i = 0; i < kSeekEntryCount; ++i) {

+    if (seek_entry_id_[i] == 0) {

+      seek_entry_id_[i] = id;

+      seek_entry_pos_[i] = pos;

+      return true;

+    }

+  }

+  return false;

+}

+uint32_t SeekHead::GetId(int index) const {

+  if (index < 0 || index >= kSeekEntryCount)

+    return UINT_MAX;

+  return seek_entry_id_[index];

+}

+uint64_t SeekHead::GetPosition(int index) const {

+  if (index < 0 || index >= kSeekEntryCount)

+    return ULLONG_MAX;

+  return seek_entry_pos_[index];

+}

+bool SeekHead::SetSeekEntry(int index, uint32_t id, uint64_t position) {

+  if (index < 0 || index >= kSeekEntryCount)

+    return false;

+  seek_entry_id_[index] = id;

+  seek_entry_pos_[index] = position;

+  return true;

+}

+uint64_t SeekHead::MaxEntrySize() const {

+  const uint64_t max_entry_payload_size =

+      EbmlElementSize(libwebm::kMkvSeekID, UINT64_C(0xffffffff)) +

+      EbmlElementSize(libwebm::kMkvSeekPosition, UINT64_C(0xffffffffffffffff));

+  const uint64_t max_entry_size =

+      EbmlMasterElementSize(libwebm::kMkvSeek, max_entry_payload_size) +

+      max_entry_payload_size;

+  return max_entry_size;

+}

+///////////////////////////////////////////////////////////////

+//

+// SegmentInfo Class

+SegmentInfo::SegmentInfo()

+    : duration_(-1.0),

+      muxing_app_(NULL),

+      timecode_scale_(1000000ULL),

+      writing_app_(NULL),

+      date_utc_(LLONG_MIN),

+      duration_pos_(-1) {}

+SegmentInfo::~SegmentInfo() {

+  delete[] muxing_app_;

+  delete[] writing_app_;

+}

+bool SegmentInfo::Init() {

+  int32_t major;

+  int32_t minor;

+  int32_t build;

+  int32_t revision;

+  GetVersion(&major, &minor, &build, &revision);

+  char temp[256];

+#ifdef _MSC_VER

+  sprintf_s(temp, sizeof(temp) / sizeof(temp[0]), "libwebm-%d.%d.%d.%d", major,

+            minor, build, revision);

+#else

+  snprintf(temp, sizeof(temp) / sizeof(temp[0]), "libwebm-%d.%d.%d.%d", major,

+           minor, build, revision);

+#endif

+  const size_t app_len = strlen(temp) + 1;

+  delete[] muxing_app_;

+  muxing_app_ = new (std::nothrow) char[app_len];  // NOLINT

+  if (!muxing_app_)

+    return false;

+#ifdef _MSC_VER

+  strcpy_s(muxing_app_, app_len, temp);

+#else

+  strcpy(muxing_app_, temp);

+#endif

+  set_writing_app(temp);

+  if (!writing_app_)

+    return false;

+  return true;

+}

+bool SegmentInfo::Finalize(IMkvWriter* writer) const {

+  if (!writer)

+    return false;

+  if (duration_ > 0.0) {

+    if (writer->Seekable()) {

+      if (duration_pos_ == -1)

+        return false;

+      const int64_t pos = writer->Position();

+      if (writer->Position(duration_pos_))

+        return false;

+      if (!WriteEbmlElement(writer, libwebm::kMkvDuration,

+                            static_cast<float>(duration_)))

+        return false;

+      if (writer->Position(pos))

+        return false;

+    }

+  }

+  return true;

+}

+bool SegmentInfo::Write(IMkvWriter* writer) {

+  if (!writer || !muxing_app_ || !writing_app_)

+    return false;

+  uint64_t size = EbmlElementSize(libwebm::kMkvTimecodeScale, timecode_scale_);

+  if (duration_ > 0.0)

+    size +=

+        EbmlElementSize(libwebm::kMkvDuration, static_cast<float>(duration_));

+  if (date_utc_ != LLONG_MIN)

+    size += EbmlDateElementSize(libwebm::kMkvDateUTC);

+  size += EbmlElementSize(libwebm::kMkvMuxingApp, muxing_app_);

+  size += EbmlElementSize(libwebm::kMkvWritingApp, writing_app_);

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvInfo, size))

+    return false;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvTimecodeScale, timecode_scale_))

+    return false;

+  if (duration_ > 0.0) {

+    // Save for later

+    duration_pos_ = writer->Position();

+    if (!WriteEbmlElement(writer, libwebm::kMkvDuration,

+                          static_cast<float>(duration_)))

+      return false;

+  }

+  if (date_utc_ != LLONG_MIN)

+    WriteEbmlDateElement(writer, libwebm::kMkvDateUTC, date_utc_);

+  if (!WriteEbmlElement(writer, libwebm::kMkvMuxingApp, muxing_app_))

+    return false;

+  if (!WriteEbmlElement(writer, libwebm::kMkvWritingApp, writing_app_))

+    return false;

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(size))

+    return false;

+  return true;

+}

+void SegmentInfo::set_muxing_app(const char* app) {

+  if (app) {

+    const size_t length = strlen(app) + 1;

+    char* temp_str = new (std::nothrow) char[length];  // NOLINT

+    if (!temp_str)

+      return;

+#ifdef _MSC_VER

+    strcpy_s(temp_str, length, app);

+#else

+    strcpy(temp_str, app);

+#endif

+    delete[] muxing_app_;

+    muxing_app_ = temp_str;

+  }

+}

+void SegmentInfo::set_writing_app(const char* app) {

+  if (app) {

+    const size_t length = strlen(app) + 1;

+    char* temp_str = new (std::nothrow) char[length];  // NOLINT

+    if (!temp_str)

+      return;

+#ifdef _MSC_VER

+    strcpy_s(temp_str, length, app);

+#else

+    strcpy(temp_str, app);

+#endif

+    delete[] writing_app_;

+    writing_app_ = temp_str;

+  }

+}

+///////////////////////////////////////////////////////////////

+//

+// Segment Class

+Segment::Segment()

+    : chunk_count_(0),

+      chunk_name_(NULL),

+      chunk_writer_cluster_(NULL),

+      chunk_writer_cues_(NULL),

+      chunk_writer_header_(NULL),

+      chunking_(false),

+      chunking_base_name_(NULL),

+      cluster_list_(NULL),

+      cluster_list_capacity_(0),

+      cluster_list_size_(0),

+      cues_position_(kAfterClusters),

+      cues_track_(0),

+      force_new_cluster_(false),

+      frames_(NULL),

+      frames_capacity_(0),

+      frames_size_(0),

+      has_video_(false),

+      header_written_(false),

+      last_block_duration_(0),

+      last_timestamp_(0),

+      max_cluster_duration_(kDefaultMaxClusterDuration),

+      max_cluster_size_(0),

+      mode_(kFile),

+      new_cuepoint_(false),

+      output_cues_(true),

+      payload_pos_(0),

+      size_position_(0),

+      doc_type_version_(kDefaultDocTypeVersion),

+      doc_type_version_written_(0),

+      writer_cluster_(NULL),

+      writer_cues_(NULL),

+      writer_header_(NULL) {

+  const time_t curr_time = time(NULL);

+  seed_ = static_cast<unsigned int>(curr_time);

+#ifdef _WIN32

+  srand(seed_);

+#endif

+}

+Segment::~Segment() {

+  if (cluster_list_) {

+    for (int32_t i = 0; i < cluster_list_size_; ++i) {

+      Cluster* const cluster = cluster_list_[i];

+      delete cluster;

+    }

+    delete[] cluster_list_;

+  }

+  if (frames_) {

+    for (int32_t i = 0; i < frames_size_; ++i) {

+      Frame* const frame = frames_[i];

+      delete frame;

+    }

+    delete[] frames_;

+  }

+  delete[] chunk_name_;

+  delete[] chunking_base_name_;

+  if (chunk_writer_cluster_) {

+    chunk_writer_cluster_->Close();

+    delete chunk_writer_cluster_;

+  }

+  if (chunk_writer_cues_) {

+    chunk_writer_cues_->Close();

+    delete chunk_writer_cues_;

+  }

+  if (chunk_writer_header_) {

+    chunk_writer_header_->Close();

+    delete chunk_writer_header_;

+  }

+}

+void Segment::MoveCuesBeforeClustersHelper(uint64_t diff, int32_t index,

+                                           uint64_t* cues_size) {

+  CuePoint* const cue_point = cues_.GetCueByIndex(index);

+  if (cue_point == NULL)

+    return;

+  const uint64_t old_cue_point_size = cue_point->Size();

+  const uint64_t cluster_pos = cue_point->cluster_pos() + diff;

+  cue_point->set_cluster_pos(cluster_pos);  // update the new cluster position

+  // New size of the cue is computed as follows

+  //    Let a = current sum of size of all CuePoints

+  //    Let b = Increase in Cue Point's size due to this iteration

+  //    Let c = Increase in size of Cues Element's length due to this iteration

+  //            (This is computed as CodedSize(a + b) - CodedSize(a))

+  //    Let d = b + c. Now d is the |diff| passed to the next recursive call.

+  //    Let e = a + b. Now e is the |cues_size| passed to the next recursive

+  //                   call.

+  const uint64_t cue_point_size_diff = cue_point->Size() - old_cue_point_size;

+  const uint64_t cue_size_diff =

+      GetCodedUIntSize(*cues_size + cue_point_size_diff) -

+      GetCodedUIntSize(*cues_size);

+  *cues_size += cue_point_size_diff;

+  diff = cue_size_diff + cue_point_size_diff;

+  if (diff > 0) {

+    for (int32_t i = 0; i < cues_.cue_entries_size(); ++i) {

+      MoveCuesBeforeClustersHelper(diff, i, cues_size);

+    }

+  }

+}

+void Segment::MoveCuesBeforeClusters() {

+  const uint64_t current_cue_size = cues_.Size();

+  uint64_t cue_size = 0;

+  for (int32_t i = 0; i < cues_.cue_entries_size(); ++i)

+    cue_size += cues_.GetCueByIndex(i)->Size();

+  for (int32_t i = 0; i < cues_.cue_entries_size(); ++i)

+    MoveCuesBeforeClustersHelper(current_cue_size, i, &cue_size);

+  // Adjust the Seek Entry to reflect the change in position

+  // of Cluster and Cues

+  int32_t cluster_index = 0;

+  int32_t cues_index = 0;

+  for (int32_t i = 0; i < SeekHead::kSeekEntryCount; ++i) {

+    if (seek_head_.GetId(i) == libwebm::kMkvCluster)

+      cluster_index = i;

+    if (seek_head_.GetId(i) == libwebm::kMkvCues)

+      cues_index = i;

+  }

+  seek_head_.SetSeekEntry(cues_index, libwebm::kMkvCues,

+                          seek_head_.GetPosition(cluster_index));

+  seek_head_.SetSeekEntry(cluster_index, libwebm::kMkvCluster,

+                          cues_.Size() + seek_head_.GetPosition(cues_index));

+}

+bool Segment::Init(IMkvWriter* ptr_writer) {

+  if (!ptr_writer) {

+    return false;

+  }

+  writer_cluster_ = ptr_writer;

+  writer_cues_ = ptr_writer;

+  writer_header_ = ptr_writer;

+  return segment_info_.Init();

+}

+bool Segment::CopyAndMoveCuesBeforeClusters(mkvparser::IMkvReader* reader,

+                                            IMkvWriter* writer) {

+  if (!writer->Seekable() || chunking_)

+    return false;

+  const int64_t cluster_offset =

+      cluster_list_[0]->size_position() - GetUIntSize(libwebm::kMkvCluster);

+  // Copy the headers.

+  if (!ChunkedCopy(reader, writer, 0, cluster_offset))

+    return false;

+  // Recompute cue positions and seek entries.

+  MoveCuesBeforeClusters();

+  // Write cues and seek entries.

+  // TODO(vigneshv): As of now, it's safe to call seek_head_.Finalize() for the

+  // second time with a different writer object. But the name Finalize() doesn't

+  // indicate something we want to call more than once. So consider renaming it

+  // to write() or some such.

+  if (!cues_.Write(writer) || !seek_head_.Finalize(writer))

+    return false;

+  // Copy the Clusters.

+  if (!ChunkedCopy(reader, writer, cluster_offset,

+                   cluster_end_offset_ - cluster_offset))

+    return false;

+  // Update the Segment size in case the Cues size has changed.

+  const int64_t pos = writer->Position();

+  const int64_t segment_size = writer->Position() - payload_pos_;

+  if (writer->Position(size_position_) ||

+      WriteUIntSize(writer, segment_size, 8) || writer->Position(pos))

+    return false;

+  return true;

+}

+bool Segment::Finalize() {

+  if (WriteFramesAll() < 0)

+    return false;

+  if (cluster_list_size_ > 0) {

+    // Update last cluster's size

+    Cluster* const old_cluster = cluster_list_[cluster_list_size_ - 1];

+    // For the last frame of the last Cluster, we don't write it as a BlockGroup

+    // with Duration unless the frame itself has duration set explicitly.

+    if (!old_cluster || !old_cluster->Finalize(false, 0))

+      return false;

+  }

+  if (mode_ == kFile) {

+    if (chunking_ && chunk_writer_cluster_) {

+      chunk_writer_cluster_->Close();

+      chunk_count_++;

+    }

+    const double duration =

+        (static_cast<double>(last_timestamp_) + last_block_duration_) /

+        segment_info_.timecode_scale();

+    segment_info_.set_duration(duration);

+    if (!segment_info_.Finalize(writer_header_))

+      return false;

+    if (output_cues_)

+      if (!seek_head_.AddSeekEntry(libwebm::kMkvCues, MaxOffset()))

+        return false;

+    if (chunking_) {

+      if (!chunk_writer_cues_)

+        return false;

+      char* name = NULL;

+      if (!UpdateChunkName("cues", &name))

+        return false;

+      const bool cues_open = chunk_writer_cues_->Open(name);

+      delete[] name;

+      if (!cues_open)

+        return false;

+    }

+    cluster_end_offset_ = writer_cluster_->Position();

+    // Write the seek headers and cues

+    if (output_cues_)

+      if (!cues_.Write(writer_cues_))

+        return false;

+    if (!seek_head_.Finalize(writer_header_))

+      return false;

+    if (writer_header_->Seekable()) {

+      if (size_position_ == -1)

+        return false;

+      const int64_t segment_size = MaxOffset();

+      if (segment_size < 1)

+        return false;

+      const int64_t pos = writer_header_->Position();

+      UpdateDocTypeVersion();

+      if (doc_type_version_ != doc_type_version_written_) {

+        if (writer_header_->Position(0))

+          return false;

+        if (!WriteEbmlHeader(writer_header_, doc_type_version_))

+          return false;

+        if (writer_header_->Position() != ebml_header_size_)

+          return false;

+        doc_type_version_written_ = doc_type_version_;

+      }

+      if (writer_header_->Position(size_position_))

+        return false;

+      if (WriteUIntSize(writer_header_, segment_size, 8))

+        return false;

+      if (writer_header_->Position(pos))

+        return false;

+    }

+    if (chunking_) {

+      // Do not close any writers until the segment size has been written,

+      // otherwise the size may be off.

+      if (!chunk_writer_cues_ || !chunk_writer_header_)

+        return false;

+      chunk_writer_cues_->Close();

+      chunk_writer_header_->Close();

+    }

+  }

+  return true;

+}

+Track* Segment::AddTrack(int32_t number) {

+  Track* const track = new (std::nothrow) Track(&seed_);  // NOLINT

+  if (!track)

+    return NULL;

+  if (!tracks_.AddTrack(track, number)) {

+    delete track;

+    return NULL;

+  }

+  return track;

+}

+Chapter* Segment::AddChapter() { return chapters_.AddChapter(&seed_); }

+Tag* Segment::AddTag() { return tags_.AddTag(); }

+uint64_t Segment::AddVideoTrack(int32_t width, int32_t height, int32_t number) {

+  VideoTrack* const track = new (std::nothrow) VideoTrack(&seed_);  // NOLINT

+  if (!track)

+    return 0;

+  track->set_type(Tracks::kVideo);

+  track->set_codec_id(Tracks::kVp8CodecId);

+  track->set_width(width);

+  track->set_height(height);

+  tracks_.AddTrack(track, number);

+  has_video_ = true;

+  return track->number();

+}

+bool Segment::AddCuePoint(uint64_t timestamp, uint64_t track) {

+  if (cluster_list_size_ < 1)

+    return false;

+  const Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

+  if (!cluster)

+    return false;

+  CuePoint* const cue = new (std::nothrow) CuePoint();  // NOLINT

+  if (!cue)

+    return false;

+  cue->set_time(timestamp / segment_info_.timecode_scale());

+  cue->set_block_number(cluster->blocks_added());

+  cue->set_cluster_pos(cluster->position_for_cues());

+  cue->set_track(track);

+  if (!cues_.AddCue(cue))

+    return false;

+  new_cuepoint_ = false;

+  return true;

+}

+uint64_t Segment::AddAudioTrack(int32_t sample_rate, int32_t channels,

+                                int32_t number) {

+  AudioTrack* const track = new (std::nothrow) AudioTrack(&seed_);  // NOLINT

+  if (!track)

+    return 0;

+  track->set_type(Tracks::kAudio);

+  track->set_codec_id(Tracks::kVorbisCodecId);

+  track->set_sample_rate(sample_rate);

+  track->set_channels(channels);

+  tracks_.AddTrack(track, number);

+  return track->number();

+}

+bool Segment::AddFrame(const uint8_t* data, uint64_t length,

+                       uint64_t track_number, uint64_t timestamp, bool is_key) {

+  if (!data)

+    return false;

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_track_number(track_number);

+  frame.set_timestamp(timestamp);

+  frame.set_is_key(is_key);

+  return AddGenericFrame(&frame);

+}

+bool Segment::AddFrameWithAdditional(const uint8_t* data, uint64_t length,

+                                     const uint8_t* additional,

+                                     uint64_t additional_length,

+                                     uint64_t add_id, uint64_t track_number,

+                                     uint64_t timestamp, bool is_key) {

+  if (!data || !additional)

+    return false;

+  Frame frame;

+  if (!frame.Init(data, length) ||

+      !frame.AddAdditionalData(additional, additional_length, add_id)) {

+    return false;

+  }

+  frame.set_track_number(track_number);

+  frame.set_timestamp(timestamp);

+  frame.set_is_key(is_key);

+  return AddGenericFrame(&frame);

+}

+bool Segment::AddFrameWithDiscardPadding(const uint8_t* data, uint64_t length,

+                                         int64_t discard_padding,

+                                         uint64_t track_number,

+                                         uint64_t timestamp, bool is_key) {

+  if (!data)

+    return false;

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_discard_padding(discard_padding);

+  frame.set_track_number(track_number);

+  frame.set_timestamp(timestamp);

+  frame.set_is_key(is_key);

+  return AddGenericFrame(&frame);

+}

+bool Segment::AddMetadata(const uint8_t* data, uint64_t length,

+                          uint64_t track_number, uint64_t timestamp_ns,

+                          uint64_t duration_ns) {

+  if (!data)

+    return false;

+  Frame frame;

+  if (!frame.Init(data, length))

+    return false;

+  frame.set_track_number(track_number);

+  frame.set_timestamp(timestamp_ns);

+  frame.set_duration(duration_ns);

+  frame.set_is_key(true);  // All metadata blocks are keyframes.

+  return AddGenericFrame(&frame);

+}

+bool Segment::AddGenericFrame(const Frame* frame) {

+  if (!frame)

+    return false;

+  if (!CheckHeaderInfo())

+    return false;

+  // Check for non-monotonically increasing timestamps.

+  if (frame->timestamp() < last_timestamp_)

+    return false;

+  // Check if the track number is valid.

+  if (!tracks_.GetTrackByNumber(frame->track_number()))

+    return false;

+  if (frame->discard_padding() != 0)

+    doc_type_version_ = 4;

+  // If the segment has a video track hold onto audio frames to make sure the

+  // audio that is associated with the start time of a video key-frame is

+  // muxed into the same cluster.

+  if (has_video_ && tracks_.TrackIsAudio(frame->track_number()) &&

+      !force_new_cluster_) {

+    Frame* const new_frame = new (std::nothrow) Frame();

+    if (!new_frame || !new_frame->CopyFrom(*frame))

+      return false;

+    return QueueFrame(new_frame);

+  }

+  if (!DoNewClusterProcessing(frame->track_number(), frame->timestamp(),

+                              frame->is_key())) {

+    return false;

+  }

+  if (cluster_list_size_ < 1)

+    return false;

+  Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

+  if (!cluster)

+    return false;

+  // If the Frame is not a SimpleBlock, then set the reference_block_timestamp

+  // if it is not set already.

+  bool frame_created = false;

+  if (!frame->CanBeSimpleBlock() && !frame->is_key() &&

+      !frame->reference_block_timestamp_set()) {

+    Frame* const new_frame = new (std::nothrow) Frame();

+    if (!new_frame->CopyFrom(*frame))

+      return false;

+    new_frame->set_reference_block_timestamp(

+        last_track_timestamp_[frame->track_number() - 1]);

+    frame = new_frame;

+    frame_created = true;

+  }

+  if (!cluster->AddFrame(frame))

+    return false;

+  if (new_cuepoint_ && cues_track_ == frame->track_number()) {

+    if (!AddCuePoint(frame->timestamp(), cues_track_))

+      return false;

+  }

+  last_timestamp_ = frame->timestamp();

+  last_track_timestamp_[frame->track_number() - 1] = frame->timestamp();

+  last_block_duration_ = frame->duration();

+  if (frame_created)

+    delete frame;

+  return true;

+}

+void Segment::OutputCues(bool output_cues) { output_cues_ = output_cues; }

+void Segment::AccurateClusterDuration(bool accurate_cluster_duration) {

+  accurate_cluster_duration_ = accurate_cluster_duration;

+}

+bool Segment::SetChunking(bool chunking, const char* filename) {

+  if (chunk_count_ > 0)

+    return false;

+  if (chunking) {

+    if (!filename)

+      return false;

+    // Check if we are being set to what is already set.

+    if (chunking_ && !strcmp(filename, chunking_base_name_))

+      return true;

+    const size_t name_length = strlen(filename) + 1;

+    char* const temp = new (std::nothrow) char[name_length];  // NOLINT

+    if (!temp)

+      return false;

+#ifdef _MSC_VER

+    strcpy_s(temp, name_length, filename);

+#else

+    strcpy(temp, filename);

+#endif

+    delete[] chunking_base_name_;

+    chunking_base_name_ = temp;

+    if (!UpdateChunkName("chk", &chunk_name_))

+      return false;

+    if (!chunk_writer_cluster_) {

+      chunk_writer_cluster_ = new (std::nothrow) MkvWriter();  // NOLINT

+      if (!chunk_writer_cluster_)

+        return false;

+    }

+    if (!chunk_writer_cues_) {

+      chunk_writer_cues_ = new (std::nothrow) MkvWriter();  // NOLINT

+      if (!chunk_writer_cues_)

+        return false;

+    }

+    if (!chunk_writer_header_) {

+      chunk_writer_header_ = new (std::nothrow) MkvWriter();  // NOLINT

+      if (!chunk_writer_header_)

+        return false;

+    }

+    if (!chunk_writer_cluster_->Open(chunk_name_))

+      return false;

+    const size_t header_length = strlen(filename) + strlen(".hdr") + 1;

+    char* const header = new (std::nothrow) char[header_length];  // NOLINT

+    if (!header)

+      return false;

+#ifdef _MSC_VER

+    strcpy_s(header, header_length - strlen(".hdr"), chunking_base_name_);

+    strcat_s(header, header_length, ".hdr");

+#else

+    strcpy(header, chunking_base_name_);

+    strcat(header, ".hdr");

+#endif

+    if (!chunk_writer_header_->Open(header)) {

+      delete[] header;

+      return false;

+    }

+    writer_cluster_ = chunk_writer_cluster_;

+    writer_cues_ = chunk_writer_cues_;

+    writer_header_ = chunk_writer_header_;

+    delete[] header;

+  }

+  chunking_ = chunking;

+  return true;

+}

+bool Segment::CuesTrack(uint64_t track_number) {

+  const Track* const track = GetTrackByNumber(track_number);

+  if (!track)

+    return false;

+  cues_track_ = track_number;

+  return true;

+}

+void Segment::ForceNewClusterOnNextFrame() { force_new_cluster_ = true; }

+Track* Segment::GetTrackByNumber(uint64_t track_number) const {

+  return tracks_.GetTrackByNumber(track_number);

+}

+bool Segment::WriteSegmentHeader() {

+  UpdateDocTypeVersion();

+  // TODO(fgalligan): Support more than one segment.

+  if (!WriteEbmlHeader(writer_header_, doc_type_version_))

+    return false;

+  doc_type_version_written_ = doc_type_version_;

+  ebml_header_size_ = static_cast<int32_t>(writer_header_->Position());

+  // Write "unknown" (-1) as segment size value. If mode is kFile, Segment

+  // will write over duration when the file is finalized.

+  if (WriteID(writer_header_, libwebm::kMkvSegment))

+    return false;

+  // Save for later.

+  size_position_ = writer_header_->Position();

+  // Write "unknown" (EBML coded -1) as segment size value. We need to write 8

+  // bytes because if we are going to overwrite the segment size later we do

+  // not know how big our segment will be.

+  if (SerializeInt(writer_header_, kEbmlUnknownValue, 8))

+    return false;

+  payload_pos_ = writer_header_->Position();

+  if (mode_ == kFile && writer_header_->Seekable()) {

+    // Set the duration > 0.0 so SegmentInfo will write out the duration. When

+    // the muxer is done writing we will set the correct duration and have

+    // SegmentInfo upadte it.

+    segment_info_.set_duration(1.0);

+    if (!seek_head_.Write(writer_header_))

+      return false;

+  }

+  if (!seek_head_.AddSeekEntry(libwebm::kMkvInfo, MaxOffset()))

+    return false;

+  if (!segment_info_.Write(writer_header_))

+    return false;

+  if (!seek_head_.AddSeekEntry(libwebm::kMkvTracks, MaxOffset()))

+    return false;

+  if (!tracks_.Write(writer_header_))

+    return false;

+  if (chapters_.Count() > 0) {

+    if (!seek_head_.AddSeekEntry(libwebm::kMkvChapters, MaxOffset()))

+      return false;

+    if (!chapters_.Write(writer_header_))

+      return false;

+  }

+  if (tags_.Count() > 0) {

+    if (!seek_head_.AddSeekEntry(libwebm::kMkvTags, MaxOffset()))

+      return false;

+    if (!tags_.Write(writer_header_))

+      return false;

+  }

+  if (chunking_ && (mode_ == kLive || !writer_header_->Seekable())) {

+    if (!chunk_writer_header_)

+      return false;

+    chunk_writer_header_->Close();

+  }

+  header_written_ = true;

+  return true;

+}

+// Here we are testing whether to create a new cluster, given a frame

+// having time frame_timestamp_ns.

+//

+int Segment::TestFrame(uint64_t track_number, uint64_t frame_timestamp_ns,

+                       bool is_key) const {

+  if (force_new_cluster_)

+    return 1;

+  // If no clusters have been created yet, then create a new cluster

+  // and write this frame immediately, in the new cluster.  This path

+  // should only be followed once, the first time we attempt to write

+  // a frame.

+  if (cluster_list_size_ <= 0)

+    return 1;

+  // There exists at least one cluster. We must compare the frame to

+  // the last cluster, in order to determine whether the frame is

+  // written to the existing cluster, or that a new cluster should be

+  // created.

+  const uint64_t timecode_scale = segment_info_.timecode_scale();

+  const uint64_t frame_timecode = frame_timestamp_ns / timecode_scale;

+  const Cluster* const last_cluster = cluster_list_[cluster_list_size_ - 1];

+  const uint64_t last_cluster_timecode = last_cluster->timecode();

+  // For completeness we test for the case when the frame's timecode

+  // is less than the cluster's timecode.  Although in principle that

+  // is allowed, this muxer doesn't actually write clusters like that,

+  // so this indicates a bug somewhere in our algorithm.

+  if (frame_timecode < last_cluster_timecode)  // should never happen

+    return -1;

+  // If the frame has a timestamp significantly larger than the last

+  // cluster (in Matroska, cluster-relative timestamps are serialized

+  // using a 16-bit signed integer), then we cannot write this frame

+  // to that cluster, and so we must create a new cluster.

+  const int64_t delta_timecode = frame_timecode - last_cluster_timecode;

+  if (delta_timecode > kMaxBlockTimecode)

+    return 2;

+  // We decide to create a new cluster when we have a video keyframe.

+  // This will flush queued (audio) frames, and write the keyframe

+  // immediately, in the newly-created cluster.

+  if (is_key && tracks_.TrackIsVideo(track_number))

+    return 1;

+  // Create a new cluster if we have accumulated too many frames

+  // already, where "too many" is defined as "the total time of frames

+  // in the cluster exceeds a threshold".

+  const uint64_t delta_ns = delta_timecode * timecode_scale;

+  if (max_cluster_duration_ > 0 && delta_ns >= max_cluster_duration_)

+    return 1;

+  // This is similar to the case above, with the difference that a new

+  // cluster is created when the size of the current cluster exceeds a

+  // threshold.

+  const uint64_t cluster_size = last_cluster->payload_size();

+  if (max_cluster_size_ > 0 && cluster_size >= max_cluster_size_)

+    return 1;

+  // There's no need to create a new cluster, so emit this frame now.

+  return 0;

+}

+bool Segment::MakeNewCluster(uint64_t frame_timestamp_ns) {

+  const int32_t new_size = cluster_list_size_ + 1;

+  if (new_size > cluster_list_capacity_) {

+    // Add more clusters.

+    const int32_t new_capacity =

+        (cluster_list_capacity_ <= 0) ? 1 : cluster_list_capacity_ * 2;

+    Cluster** const clusters =

+        new (std::nothrow) Cluster*[new_capacity];  // NOLINT

+    if (!clusters)

+      return false;

+    for (int32_t i = 0; i < cluster_list_size_; ++i) {

+      clusters[i] = cluster_list_[i];

+    }

+    delete[] cluster_list_;

+    cluster_list_ = clusters;

+    cluster_list_capacity_ = new_capacity;

+  }

+  if (!WriteFramesLessThan(frame_timestamp_ns))

+    return false;

+  if (cluster_list_size_ > 0) {

+    // Update old cluster's size

+    Cluster* const old_cluster = cluster_list_[cluster_list_size_ - 1];

+    if (!old_cluster || !old_cluster->Finalize(true, frame_timestamp_ns))

+      return false;

+  }

+  if (output_cues_)

+    new_cuepoint_ = true;

+  if (chunking_ && cluster_list_size_ > 0) {

+    chunk_writer_cluster_->Close();

+    chunk_count_++;

+    if (!UpdateChunkName("chk", &chunk_name_))

+      return false;

+    if (!chunk_writer_cluster_->Open(chunk_name_))

+      return false;

+  }

+  const uint64_t timecode_scale = segment_info_.timecode_scale();

+  const uint64_t frame_timecode = frame_timestamp_ns / timecode_scale;

+  uint64_t cluster_timecode = frame_timecode;

+  if (frames_size_ > 0) {

+    const Frame* const f = frames_[0];  // earliest queued frame

+    const uint64_t ns = f->timestamp();

+    const uint64_t tc = ns / timecode_scale;

+    if (tc < cluster_timecode)

+      cluster_timecode = tc;

+  }

+  Cluster*& cluster = cluster_list_[cluster_list_size_];

+  const int64_t offset = MaxOffset();

+  cluster = new (std::nothrow)

+      Cluster(cluster_timecode, offset, segment_info_.timecode_scale(),

+              accurate_cluster_duration_);

+  if (!cluster)

+    return false;

+  if (!cluster->Init(writer_cluster_))

+    return false;

+  cluster_list_size_ = new_size;

+  return true;

+}

+bool Segment::DoNewClusterProcessing(uint64_t track_number,

+                                     uint64_t frame_timestamp_ns, bool is_key) {

+  for (;;) {

+    // Based on the characteristics of the current frame and current

+    // cluster, decide whether to create a new cluster.

+    const int result = TestFrame(track_number, frame_timestamp_ns, is_key);

+    if (result < 0)  // error

+      return false;

+    // Always set force_new_cluster_ to false after TestFrame.

+    force_new_cluster_ = false;

+    // A non-zero result means create a new cluster.

+    if (result > 0 && !MakeNewCluster(frame_timestamp_ns))

+      return false;

+    // Write queued (audio) frames.

+    const int frame_count = WriteFramesAll();

+    if (frame_count < 0)  // error

+      return false;

+    // Write the current frame to the current cluster (if TestFrame

+    // returns 0) or to a newly created cluster (TestFrame returns 1).

+    if (result <= 1)

+      return true;

+    // TestFrame returned 2, which means there was a large time

+    // difference between the cluster and the frame itself.  Do the

+    // test again, comparing the frame to the new cluster.

+  }

+}

+bool Segment::CheckHeaderInfo() {

+  if (!header_written_) {

+    if (!WriteSegmentHeader())

+      return false;

+    if (!seek_head_.AddSeekEntry(libwebm::kMkvCluster, MaxOffset()))

+      return false;

+    if (output_cues_ && cues_track_ == 0) {

+      // Check for a video track

+      for (uint32_t i = 0; i < tracks_.track_entries_size(); ++i) {

+        const Track* const track = tracks_.GetTrackByIndex(i);

+        if (!track)

+          return false;

+        if (tracks_.TrackIsVideo(track->number())) {

+          cues_track_ = track->number();

+          break;

+        }

+      }

+      // Set first track found

+      if (cues_track_ == 0) {

+        const Track* const track = tracks_.GetTrackByIndex(0);

+        if (!track)

+          return false;

+        cues_track_ = track->number();

+      }

+    }

+  }

+  return true;

+}

+void Segment::UpdateDocTypeVersion() {

+  for (uint32_t index = 0; index < tracks_.track_entries_size(); ++index) {

+    const Track* track = tracks_.GetTrackByIndex(index);

+    if (track == NULL)

+      break;

+    if ((track->codec_delay() || track->seek_pre_roll()) &&

+        doc_type_version_ < 4) {

+      doc_type_version_ = 4;

+      break;

+    }

+  }

+}

+bool Segment::UpdateChunkName(const char* ext, char** name) const {

+  if (!name || !ext)

+    return false;

+  char ext_chk[64];

+#ifdef _MSC_VER

+  sprintf_s(ext_chk, sizeof(ext_chk), "_%06d.%s", chunk_count_, ext);

+#else

+  snprintf(ext_chk, sizeof(ext_chk), "_%06d.%s", chunk_count_, ext);

+#endif

+  const size_t length = strlen(chunking_base_name_) + strlen(ext_chk) + 1;

+  char* const str = new (std::nothrow) char[length];  // NOLINT

+  if (!str)

+    return false;

+#ifdef _MSC_VER

+  strcpy_s(str, length - strlen(ext_chk), chunking_base_name_);

+  strcat_s(str, length, ext_chk);

+#else

+  strcpy(str, chunking_base_name_);

+  strcat(str, ext_chk);

+#endif

+  delete[] * name;

+  *name = str;

+  return true;

+}

+int64_t Segment::MaxOffset() {

+  if (!writer_header_)

+    return -1;

+  int64_t offset = writer_header_->Position() - payload_pos_;

+  if (chunking_) {

+    for (int32_t i = 0; i < cluster_list_size_; ++i) {

+      Cluster* const cluster = cluster_list_[i];

+      offset += cluster->Size();

+    }

+    if (writer_cues_)

+      offset += writer_cues_->Position();

+  }

+  return offset;

+}

+bool Segment::QueueFrame(Frame* frame) {

+  const int32_t new_size = frames_size_ + 1;

+  if (new_size > frames_capacity_) {

+    // Add more frames.

+    const int32_t new_capacity = (!frames_capacity_) ? 2 : frames_capacity_ * 2;

+    if (new_capacity < 1)

+      return false;

+    Frame** const frames = new (std::nothrow) Frame*[new_capacity];  // NOLINT

+    if (!frames)

+      return false;

+    for (int32_t i = 0; i < frames_size_; ++i) {

+      frames[i] = frames_[i];

+    }

+    delete[] frames_;

+    frames_ = frames;

+    frames_capacity_ = new_capacity;

+  }

+  frames_[frames_size_++] = frame;

+  return true;

+}

+int Segment::WriteFramesAll() {

+  if (frames_ == NULL)

+    return 0;

+  if (cluster_list_size_ < 1)

+    return -1;

+  Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

+  if (!cluster)

+    return -1;

+  for (int32_t i = 0; i < frames_size_; ++i) {

+    Frame*& frame = frames_[i];

+    // TODO(jzern/vigneshv): using Segment::AddGenericFrame here would limit the

+    // places where |doc_type_version_| needs to be updated.

+    if (frame->discard_padding() != 0)

+      doc_type_version_ = 4;

+    if (!cluster->AddFrame(frame))

+      return -1;

+    if (new_cuepoint_ && cues_track_ == frame->track_number()) {

+      if (!AddCuePoint(frame->timestamp(), cues_track_))

+        return -1;

+    }

+    if (frame->timestamp() > last_timestamp_) {

+      last_timestamp_ = frame->timestamp();

+      last_track_timestamp_[frame->track_number() - 1] = frame->timestamp();

+    }

+    delete frame;

+    frame = NULL;

+  }

+  const int result = frames_size_;

+  frames_size_ = 0;

+  return result;

+}

+bool Segment::WriteFramesLessThan(uint64_t timestamp) {

+  // Check |cluster_list_size_| to see if this is the first cluster. If it is

+  // the first cluster the audio frames that are less than the first video

+  // timesatmp will be written in a later step.

+  if (frames_size_ > 0 && cluster_list_size_ > 0) {

+    if (!frames_)

+      return false;

+    Cluster* const cluster = cluster_list_[cluster_list_size_ - 1];

+    if (!cluster)

+      return false;

+    int32_t shift_left = 0;

+    // TODO(fgalligan): Change this to use the durations of frames instead of

+    // the next frame's start time if the duration is accurate.

+    for (int32_t i = 1; i < frames_size_; ++i) {

+      const Frame* const frame_curr = frames_[i];

+      if (frame_curr->timestamp() > timestamp)

+        break;

+      const Frame* const frame_prev = frames_[i - 1];

+      if (frame_prev->discard_padding() != 0)

+        doc_type_version_ = 4;

+      if (!cluster->AddFrame(frame_prev))

+        return false;

+      if (new_cuepoint_ && cues_track_ == frame_prev->track_number()) {

+        if (!AddCuePoint(frame_prev->timestamp(), cues_track_))

+          return false;

+      }

+      ++shift_left;

+      if (frame_prev->timestamp() > last_timestamp_) {

+        last_timestamp_ = frame_prev->timestamp();

+        last_track_timestamp_[frame_prev->track_number() - 1] =

+            frame_prev->timestamp();

+      }

+      delete frame_prev;

+    }

+    if (shift_left > 0) {

+      if (shift_left >= frames_size_)

+        return false;

+      const int32_t new_frames_size = frames_size_ - shift_left;

+      for (int32_t i = 0; i < new_frames_size; ++i) {

+        frames_[i] = frames_[i + shift_left];

+      }

+      frames_size_ = new_frames_size;

+    }

+  }

+  return true;

+}

+}  // namespace mkvmuxer

\ No newline at end of file

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvmuxer.h

@@ -1,0 +1,1684 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVMUXER_MKVMUXER_H_

+#define MKVMUXER_MKVMUXER_H_

+#include <stdint.h>

+#include <cstddef>

+#include <list>

+#include <map>

+#include "common/webmids.h"

+#include "mkvmuxer/mkvmuxertypes.h"

+// For a description of the WebM elements see

+// http://www.webmproject.org/code/specs/container/.

+namespace mkvparser {

+class IMkvReader;

+}  // namespace mkvparser

+namespace mkvmuxer {

+class MkvWriter;

+class Segment;

+const uint64_t kMaxTrackNumber = 126;

+///////////////////////////////////////////////////////////////

+// Interface used by the mkvmuxer to write out the Mkv data.

+class IMkvWriter {

+ public:

+  // Writes out |len| bytes of |buf|. Returns 0 on success.

+  virtual int32_t Write(const void* buf, uint32_t len) = 0;

+  // Returns the offset of the output position from the beginning of the

+  // output.

+  virtual int64_t Position() const = 0;

+  // Set the current File position. Returns 0 on success.

+  virtual int32_t Position(int64_t position) = 0;

+  // Returns true if the writer is seekable.

+  virtual bool Seekable() const = 0;

+  // Element start notification. Called whenever an element identifier is about

+  // to be written to the stream. |element_id| is the element identifier, and

+  // |position| is the location in the WebM stream where the first octet of the

+  // element identifier will be written.

+  // Note: the |MkvId| enumeration in webmids.hpp defines element values.

+  virtual void ElementStartNotify(uint64_t element_id, int64_t position) = 0;

+ protected:

+  IMkvWriter();

+  virtual ~IMkvWriter();

+ private:

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(IMkvWriter);

+};

+// Writes out the EBML header for a WebM file. This function must be called

+// before any other libwebm writing functions are called.

+bool WriteEbmlHeader(IMkvWriter* writer, uint64_t doc_type_version);

+// Deprecated. Writes out EBML header with doc_type_version as

+// kDefaultDocTypeVersion. Exists for backward compatibility.

+bool WriteEbmlHeader(IMkvWriter* writer);

+// Copies in Chunk from source to destination between the given byte positions

+bool ChunkedCopy(mkvparser::IMkvReader* source, IMkvWriter* dst, int64_t start,

+                 int64_t size);

+///////////////////////////////////////////////////////////////

+// Class to hold data the will be written to a block.

+class Frame {

+ public:

+  Frame();

+  ~Frame();

+  // Sets this frame's contents based on |frame|. Returns true on success. On

+  // failure, this frame's existing contents may be lost.

+  bool CopyFrom(const Frame& frame);

+  // Copies |frame| data into |frame_|. Returns true on success.

+  bool Init(const uint8_t* frame, uint64_t length);

+  // Copies |additional| data into |additional_|. Returns true on success.

+  bool AddAdditionalData(const uint8_t* additional, uint64_t length,

+                         uint64_t add_id);

+  // Returns true if the frame has valid parameters.

+  bool IsValid() const;

+  // Returns true if the frame can be written as a SimpleBlock based on current

+  // parameters.

+  bool CanBeSimpleBlock() const;

+  uint64_t add_id() const { return add_id_; }

+  const uint8_t* additional() const { return additional_; }

+  uint64_t additional_length() const { return additional_length_; }

+  void set_duration(uint64_t duration);

+  uint64_t duration() const { return duration_; }

+  bool duration_set() const { return duration_set_; }

+  const uint8_t* frame() const { return frame_; }

+  void set_is_key(bool key) { is_key_ = key; }

+  bool is_key() const { return is_key_; }

+  uint64_t length() const { return length_; }

+  void set_track_number(uint64_t track_number) { track_number_ = track_number; }

+  uint64_t track_number() const { return track_number_; }

+  void set_timestamp(uint64_t timestamp) { timestamp_ = timestamp; }

+  uint64_t timestamp() const { return timestamp_; }

+  void set_discard_padding(int64_t discard_padding) {

+    discard_padding_ = discard_padding;

+  }

+  int64_t discard_padding() const { return discard_padding_; }

+  void set_reference_block_timestamp(int64_t reference_block_timestamp);

+  int64_t reference_block_timestamp() const {

+    return reference_block_timestamp_;

+  }

+  bool reference_block_timestamp_set() const {

+    return reference_block_timestamp_set_;

+  }

+ private:

+  // Id of the Additional data.

+  uint64_t add_id_;

+  // Pointer to additional data. Owned by this class.

+  uint8_t* additional_;

+  // Length of the additional data.

+  uint64_t additional_length_;

+  // Duration of the frame in nanoseconds.

+  uint64_t duration_;

+  // Flag indicating that |duration_| has been set. Setting duration causes the

+  // frame to be written out as a Block with BlockDuration instead of as a

+  // SimpleBlock.

+  bool duration_set_;

+  // Pointer to the data. Owned by this class.

+  uint8_t* frame_;

+  // Flag telling if the data should set the key flag of a block.

+  bool is_key_;

+  // Length of the data.

+  uint64_t length_;

+  // Mkv track number the data is associated with.

+  uint64_t track_number_;

+  // Timestamp of the data in nanoseconds.

+  uint64_t timestamp_;

+  // Discard padding for the frame.

+  int64_t discard_padding_;

+  // Reference block timestamp.

+  int64_t reference_block_timestamp_;

+  // Flag indicating if |reference_block_timestamp_| has been set.

+  bool reference_block_timestamp_set_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Frame);

+};

+///////////////////////////////////////////////////////////////

+// Class to hold one cue point in a Cues element.

+class CuePoint {

+ public:

+  CuePoint();

+  ~CuePoint();

+  // Returns the size in bytes for the entire CuePoint element.

+  uint64_t Size() const;

+  // Output the CuePoint element to the writer. Returns true on success.

+  bool Write(IMkvWriter* writer) const;

+  void set_time(uint64_t time) { time_ = time; }

+  uint64_t time() const { return time_; }

+  void set_track(uint64_t track) { track_ = track; }

+  uint64_t track() const { return track_; }

+  void set_cluster_pos(uint64_t cluster_pos) { cluster_pos_ = cluster_pos; }

+  uint64_t cluster_pos() const { return cluster_pos_; }

+  void set_block_number(uint64_t block_number) { block_number_ = block_number; }

+  uint64_t block_number() const { return block_number_; }

+  void set_output_block_number(bool output_block_number) {

+    output_block_number_ = output_block_number;

+  }

+  bool output_block_number() const { return output_block_number_; }

+ private:

+  // Returns the size in bytes for the payload of the CuePoint element.

+  uint64_t PayloadSize() const;

+  // Absolute timecode according to the segment time base.

+  uint64_t time_;

+  // The Track element associated with the CuePoint.

+  uint64_t track_;

+  // The position of the Cluster containing the Block.

+  uint64_t cluster_pos_;

+  // Number of the Block within the Cluster, starting from 1.

+  uint64_t block_number_;

+  // If true the muxer will write out the block number for the cue if the

+  // block number is different than the default of 1. Default is set to true.

+  bool output_block_number_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(CuePoint);

+};

+///////////////////////////////////////////////////////////////

+// Cues element.

+class Cues {

+ public:

+  Cues();

+  ~Cues();

+  // Adds a cue point to the Cues element. Returns true on success.

+  bool AddCue(CuePoint* cue);

+  // Returns the cue point by index. Returns NULL if there is no cue point

+  // match.

+  CuePoint* GetCueByIndex(int32_t index) const;

+  // Returns the total size of the Cues element

+  uint64_t Size();

+  // Output the Cues element to the writer. Returns true on success.

+  bool Write(IMkvWriter* writer) const;

+  int32_t cue_entries_size() const { return cue_entries_size_; }

+  void set_output_block_number(bool output_block_number) {

+    output_block_number_ = output_block_number;

+  }

+  bool output_block_number() const { return output_block_number_; }

+ private:

+  // Number of allocated elements in |cue_entries_|.

+  int32_t cue_entries_capacity_;

+  // Number of CuePoints in |cue_entries_|.

+  int32_t cue_entries_size_;

+  // CuePoint list.

+  CuePoint** cue_entries_;

+  // If true the muxer will write out the block number for the cue if the

+  // block number is different than the default of 1. Default is set to true.

+  bool output_block_number_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Cues);

+};

+///////////////////////////////////////////////////////////////

+// ContentEncAESSettings element

+class ContentEncAESSettings {

+ public:

+  enum { kCTR = 1 };

+  ContentEncAESSettings();

+  ~ContentEncAESSettings() {}

+  // Returns the size in bytes for the ContentEncAESSettings element.

+  uint64_t Size() const;

+  // Writes out the ContentEncAESSettings element to |writer|. Returns true on

+  // success.

+  bool Write(IMkvWriter* writer) const;

+  uint64_t cipher_mode() const { return cipher_mode_; }

+ private:

+  // Returns the size in bytes for the payload of the ContentEncAESSettings

+  // element.

+  uint64_t PayloadSize() const;

+  // Sub elements

+  uint64_t cipher_mode_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncAESSettings);

+};

+///////////////////////////////////////////////////////////////

+// ContentEncoding element

+// Elements used to describe if the track data has been encrypted or

+// compressed with zlib or header stripping.

+// Currently only whole frames can be encrypted with AES. This dictates that

+// ContentEncodingOrder will be 0, ContentEncodingScope will be 1,

+// ContentEncodingType will be 1, and ContentEncAlgo will be 5.

+class ContentEncoding {

+ public:

+  ContentEncoding();

+  ~ContentEncoding();

+  // Sets the content encryption id. Copies |length| bytes from |id| to

+  // |enc_key_id_|. Returns true on success.

+  bool SetEncryptionID(const uint8_t* id, uint64_t length);

+  // Returns the size in bytes for the ContentEncoding element.

+  uint64_t Size() const;

+  // Writes out the ContentEncoding element to |writer|. Returns true on

+  // success.

+  bool Write(IMkvWriter* writer) const;

+  uint64_t enc_algo() const { return enc_algo_; }

+  uint64_t encoding_order() const { return encoding_order_; }

+  uint64_t encoding_scope() const { return encoding_scope_; }

+  uint64_t encoding_type() const { return encoding_type_; }

+  ContentEncAESSettings* enc_aes_settings() { return &enc_aes_settings_; }

+ private:

+  // Returns the size in bytes for the encoding elements.

+  uint64_t EncodingSize(uint64_t compresion_size,

+                        uint64_t encryption_size) const;

+  // Returns the size in bytes for the encryption elements.

+  uint64_t EncryptionSize() const;

+  // Track element names

+  uint64_t enc_algo_;

+  uint8_t* enc_key_id_;

+  uint64_t encoding_order_;

+  uint64_t encoding_scope_;

+  uint64_t encoding_type_;

+  // ContentEncAESSettings element.

+  ContentEncAESSettings enc_aes_settings_;

+  // Size of the ContentEncKeyID data in bytes.

+  uint64_t enc_key_id_length_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncoding);

+};

+///////////////////////////////////////////////////////////////

+// Colour element.

+struct PrimaryChromaticity {

+  PrimaryChromaticity(float x_val, float y_val) : x(x_val), y(y_val) {}

+  PrimaryChromaticity() : x(0), y(0) {}

+  ~PrimaryChromaticity() {}

+  uint64_t PrimaryChromaticityPayloadSize(libwebm::MkvId x_id,

+                                          libwebm::MkvId y_id) const;

+  bool Write(IMkvWriter* writer, libwebm::MkvId x_id,

+             libwebm::MkvId y_id) const;

+  float x;

+  float y;

+};

+class MasteringMetadata {

+ public:

+  static const float kValueNotPresent;

+  MasteringMetadata()

+      : luminance_max(kValueNotPresent),

+        luminance_min(kValueNotPresent),

+        r_(NULL),

+        g_(NULL),

+        b_(NULL),

+        white_point_(NULL) {}

+  ~MasteringMetadata() {

+    delete r_;

+    delete g_;

+    delete b_;

+    delete white_point_;

+  }

+  // Returns total size of the MasteringMetadata element.

+  uint64_t MasteringMetadataSize() const;

+  bool Write(IMkvWriter* writer) const;

+  // Copies non-null chromaticity.

+  bool SetChromaticity(const PrimaryChromaticity* r,

+                       const PrimaryChromaticity* g,

+                       const PrimaryChromaticity* b,

+                       const PrimaryChromaticity* white_point);

+  const PrimaryChromaticity* r() const { return r_; }

+  const PrimaryChromaticity* g() const { return g_; }

+  const PrimaryChromaticity* b() const { return b_; }

+  const PrimaryChromaticity* white_point() const { return white_point_; }

+  float luminance_max;

+  float luminance_min;

+ private:

+  // Returns size of MasteringMetadata child elements.

+  uint64_t PayloadSize() const;

+  PrimaryChromaticity* r_;

+  PrimaryChromaticity* g_;

+  PrimaryChromaticity* b_;

+  PrimaryChromaticity* white_point_;

+};

+class Colour {

+ public:

+  static const uint64_t kValueNotPresent;

+  Colour()

+      : matrix_coefficients(kValueNotPresent),

+        bits_per_channel(kValueNotPresent),

+        chroma_subsampling_horz(kValueNotPresent),

+        chroma_subsampling_vert(kValueNotPresent),

+        cb_subsampling_horz(kValueNotPresent),

+        cb_subsampling_vert(kValueNotPresent),

+        chroma_siting_horz(kValueNotPresent),

+        chroma_siting_vert(kValueNotPresent),

+        range(kValueNotPresent),

+        transfer_characteristics(kValueNotPresent),

+        primaries(kValueNotPresent),

+        max_cll(kValueNotPresent),

+        max_fall(kValueNotPresent),

+        mastering_metadata_(NULL) {}

+  ~Colour() { delete mastering_metadata_; }

+  // Returns total size of the Colour element.

+  uint64_t ColourSize() const;

+  bool Write(IMkvWriter* writer) const;

+  // Deep copies |mastering_metadata|.

+  bool SetMasteringMetadata(const MasteringMetadata& mastering_metadata);

+  const MasteringMetadata* mastering_metadata() const {

+    return mastering_metadata_;

+  }

+  uint64_t matrix_coefficients;

+  uint64_t bits_per_channel;

+  uint64_t chroma_subsampling_horz;

+  uint64_t chroma_subsampling_vert;

+  uint64_t cb_subsampling_horz;

+  uint64_t cb_subsampling_vert;

+  uint64_t chroma_siting_horz;

+  uint64_t chroma_siting_vert;

+  uint64_t range;

+  uint64_t transfer_characteristics;

+  uint64_t primaries;

+  uint64_t max_cll;

+  uint64_t max_fall;

+ private:

+  // Returns size of Colour child elements.

+  uint64_t PayloadSize() const;

+  MasteringMetadata* mastering_metadata_;

+};

+///////////////////////////////////////////////////////////////

+// Track element.

+class Track {

+ public:

+  // The |seed| parameter is used to synthesize a UID for the track.

+  explicit Track(unsigned int* seed);

+  virtual ~Track();

+  // Adds a ContentEncoding element to the Track. Returns true on success.

+  virtual bool AddContentEncoding();

+  // Returns the ContentEncoding by index. Returns NULL if there is no

+  // ContentEncoding match.

+  ContentEncoding* GetContentEncodingByIndex(uint32_t index) const;

+  // Returns the size in bytes for the payload of the Track element.

+  virtual uint64_t PayloadSize() const;

+  // Returns the size in bytes of the Track element.

+  virtual uint64_t Size() const;

+  // Output the Track element to the writer. Returns true on success.

+  virtual bool Write(IMkvWriter* writer) const;

+  // Sets the CodecPrivate element of the Track element. Copies |length|

+  // bytes from |codec_private| to |codec_private_|. Returns true on success.

+  bool SetCodecPrivate(const uint8_t* codec_private, uint64_t length);

+  void set_codec_id(const char* codec_id);

+  const char* codec_id() const { return codec_id_; }

+  const uint8_t* codec_private() const { return codec_private_; }

+  void set_language(const char* language);

+  const char* language() const { return language_; }

+  void set_max_block_additional_id(uint64_t max_block_additional_id) {

+    max_block_additional_id_ = max_block_additional_id;

+  }

+  uint64_t max_block_additional_id() const { return max_block_additional_id_; }

+  void set_name(const char* name);

+  const char* name() const { return name_; }

+  void set_number(uint64_t number) { number_ = number; }

+  uint64_t number() const { return number_; }

+  void set_type(uint64_t type) { type_ = type; }

+  uint64_t type() const { return type_; }

+  void set_uid(uint64_t uid) { uid_ = uid; }

+  uint64_t uid() const { return uid_; }

+  void set_codec_delay(uint64_t codec_delay) { codec_delay_ = codec_delay; }

+  uint64_t codec_delay() const { return codec_delay_; }

+  void set_seek_pre_roll(uint64_t seek_pre_roll) {

+    seek_pre_roll_ = seek_pre_roll;

+  }

+  uint64_t seek_pre_roll() const { return seek_pre_roll_; }

+  void set_default_duration(uint64_t default_duration) {

+    default_duration_ = default_duration;

+  }

+  uint64_t default_duration() const { return default_duration_; }

+  uint64_t codec_private_length() const { return codec_private_length_; }

+  uint32_t content_encoding_entries_size() const {

+    return content_encoding_entries_size_;

+  }

+ private:

+  // Track element names.

+  char* codec_id_;

+  uint8_t* codec_private_;

+  char* language_;

+  uint64_t max_block_additional_id_;

+  char* name_;

+  uint64_t number_;

+  uint64_t type_;

+  uint64_t uid_;

+  uint64_t codec_delay_;

+  uint64_t seek_pre_roll_;

+  uint64_t default_duration_;

+  // Size of the CodecPrivate data in bytes.

+  uint64_t codec_private_length_;

+  // ContentEncoding element list.

+  ContentEncoding** content_encoding_entries_;

+  // Number of ContentEncoding elements added.

+  uint32_t content_encoding_entries_size_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Track);

+};

+///////////////////////////////////////////////////////////////

+// Track that has video specific elements.

+class VideoTrack : public Track {

+ public:

+  // Supported modes for stereo 3D.

+  enum StereoMode {

+    kMono = 0,

+    kSideBySideLeftIsFirst = 1,

+    kTopBottomRightIsFirst = 2,

+    kTopBottomLeftIsFirst = 3,

+    kSideBySideRightIsFirst = 11

+  };

+  enum AlphaMode { kNoAlpha = 0, kAlpha = 1 };

+  // The |seed| parameter is used to synthesize a UID for the track.

+  explicit VideoTrack(unsigned int* seed);

+  virtual ~VideoTrack();

+  // Returns the size in bytes for the payload of the Track element plus the

+  // video specific elements.

+  virtual uint64_t PayloadSize() const;

+  // Output the VideoTrack element to the writer. Returns true on success.

+  virtual bool Write(IMkvWriter* writer) const;

+  // Sets the video's stereo mode. Returns true on success.

+  bool SetStereoMode(uint64_t stereo_mode);

+  // Sets the video's alpha mode. Returns true on success.

+  bool SetAlphaMode(uint64_t alpha_mode);

+  void set_display_height(uint64_t height) { display_height_ = height; }

+  uint64_t display_height() const { return display_height_; }

+  void set_display_width(uint64_t width) { display_width_ = width; }

+  uint64_t display_width() const { return display_width_; }

+  void set_crop_left(uint64_t crop_left) { crop_left_ = crop_left; }

+  uint64_t crop_left() const { return crop_left_; }

+  void set_crop_right(uint64_t crop_right) { crop_right_ = crop_right; }

+  uint64_t crop_right() const { return crop_right_; }

+  void set_crop_top(uint64_t crop_top) { crop_top_ = crop_top; }

+  uint64_t crop_top() const { return crop_top_; }

+  void set_crop_bottom(uint64_t crop_bottom) { crop_bottom_ = crop_bottom; }

+  uint64_t crop_bottom() const { return crop_bottom_; }

+  void set_frame_rate(double frame_rate) { frame_rate_ = frame_rate; }

+  double frame_rate() const { return frame_rate_; }

+  void set_height(uint64_t height) { height_ = height; }

+  uint64_t height() const { return height_; }

+  uint64_t stereo_mode() { return stereo_mode_; }

+  uint64_t alpha_mode() { return alpha_mode_; }

+  void set_width(uint64_t width) { width_ = width; }

+  uint64_t width() const { return width_; }

+  Colour* colour() { return colour_; }

+  // Deep copies |colour|.

+  bool SetColour(const Colour& colour);

+ private:

+  // Returns the size in bytes of the Video element.

+  uint64_t VideoPayloadSize() const;

+  // Video track element names.

+  uint64_t display_height_;

+  uint64_t display_width_;

+  uint64_t crop_left_;

+  uint64_t crop_right_;

+  uint64_t crop_top_;

+  uint64_t crop_bottom_;

+  double frame_rate_;

+  uint64_t height_;

+  uint64_t stereo_mode_;

+  uint64_t alpha_mode_;

+  uint64_t width_;

+  Colour* colour_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(VideoTrack);

+};

+///////////////////////////////////////////////////////////////

+// Track that has audio specific elements.

+class AudioTrack : public Track {

+ public:

+  // The |seed| parameter is used to synthesize a UID for the track.

+  explicit AudioTrack(unsigned int* seed);

+  virtual ~AudioTrack();

+  // Returns the size in bytes for the payload of the Track element plus the

+  // audio specific elements.

+  virtual uint64_t PayloadSize() const;

+  // Output the AudioTrack element to the writer. Returns true on success.

+  virtual bool Write(IMkvWriter* writer) const;

+  void set_bit_depth(uint64_t bit_depth) { bit_depth_ = bit_depth; }

+  uint64_t bit_depth() const { return bit_depth_; }

+  void set_channels(uint64_t channels) { channels_ = channels; }

+  uint64_t channels() const { return channels_; }

+  void set_sample_rate(double sample_rate) { sample_rate_ = sample_rate; }

+  double sample_rate() const { return sample_rate_; }

+ private:

+  // Audio track element names.

+  uint64_t bit_depth_;

+  uint64_t channels_;

+  double sample_rate_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(AudioTrack);

+};

+///////////////////////////////////////////////////////////////

+// Tracks element

+class Tracks {

+ public:

+  // Audio and video type defined by the Matroska specs.

+  enum { kVideo = 0x1, kAudio = 0x2 };

+  static const char kOpusCodecId[];

+  static const char kVorbisCodecId[];

+  static const char kVp8CodecId[];

+  static const char kVp9CodecId[];

+  static const char kVp10CodecId[];

+  Tracks();

+  ~Tracks();

+  // Adds a Track element to the Tracks object. |track| will be owned and

+  // deleted by the Tracks object. Returns true on success. |number| is the

+  // number to use for the track. |number| must be >= 0. If |number| == 0

+  // then the muxer will decide on the track number.

+  bool AddTrack(Track* track, int32_t number);

+  // Returns the track by index. Returns NULL if there is no track match.

+  const Track* GetTrackByIndex(uint32_t idx) const;

+  // Search the Tracks and return the track that matches |tn|. Returns NULL

+  // if there is no track match.

+  Track* GetTrackByNumber(uint64_t track_number) const;

+  // Returns true if the track number is an audio track.

+  bool TrackIsAudio(uint64_t track_number) const;

+  // Returns true if the track number is a video track.

+  bool TrackIsVideo(uint64_t track_number) const;

+  // Output the Tracks element to the writer. Returns true on success.

+  bool Write(IMkvWriter* writer) const;

+  uint32_t track_entries_size() const { return track_entries_size_; }

+ private:

+  // Track element list.

+  Track** track_entries_;

+  // Number of Track elements added.

+  uint32_t track_entries_size_;

+  // Whether or not Tracks element has already been written via IMkvWriter.

+  mutable bool wrote_tracks_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tracks);

+};

+///////////////////////////////////////////////////////////////

+// Chapter element

+//

+class Chapter {

+ public:

+  // Set the identifier for this chapter.  (This corresponds to the

+  // Cue Identifier line in WebVTT.)

+  // TODO(matthewjheaney): the actual serialization of this item in

+  // MKV is pending.

+  bool set_id(const char* id);

+  // Converts the nanosecond start and stop times of this chapter to

+  // their corresponding timecode values, and stores them that way.

+  void set_time(const Segment& segment, uint64_t start_time_ns,

+                uint64_t end_time_ns);

+  // Sets the uid for this chapter. Primarily used to enable

+  // deterministic output from the muxer.

+  void set_uid(const uint64_t uid) { uid_ = uid; }

+  // Add a title string to this chapter, per the semantics described

+  // here:

+  //  http://www.matroska.org/technical/specs/index.html

+  //

+  // The title ("chapter string") is a UTF-8 string.

+  //

+  // The language has ISO 639-2 representation, described here:

+  //  http://www.loc.gov/standards/iso639-2/englangn.html

+  //  http://www.loc.gov/standards/iso639-2/php/English_list.php

+  // If you specify NULL as the language value, this implies

+  // English ("eng").

+  //

+  // The country value corresponds to the codes listed here:

+  //  http://www.iana.org/domains/root/db/

+  //

+  // The function returns false if the string could not be allocated.

+  bool add_string(const char* title, const char* language, const char* country);

+ private:

+  friend class Chapters;

+  // For storage of chapter titles that differ by language.

+  class Display {

+   public:

+    // Establish representation invariant for new Display object.

+    void Init();

+    // Reclaim resources, in anticipation of destruction.

+    void Clear();

+    // Copies the title to the |title_| member.  Returns false on

+    // error.

+    bool set_title(const char* title);

+    // Copies the language to the |language_| member.  Returns false

+    // on error.

+    bool set_language(const char* language);

+    // Copies the country to the |country_| member.  Returns false on

+    // error.

+    bool set_country(const char* country);

+    // If |writer| is non-NULL, serialize the Display sub-element of

+    // the Atom into the stream.  Returns the Display element size on

+    // success, 0 if error.

+    uint64_t WriteDisplay(IMkvWriter* writer) const;

+   private:

+    char* title_;

+    char* language_;

+    char* country_;

+  };

+  Chapter();

+  ~Chapter();

+  // Establish the representation invariant for a newly-created

+  // Chapter object.  The |seed| parameter is used to create the UID

+  // for this chapter atom.

+  void Init(unsigned int* seed);

+  // Copies this Chapter object to a different one.  This is used when

+  // expanding a plain array of Chapter objects (see Chapters).

+  void ShallowCopy(Chapter* dst) const;

+  // Reclaim resources used by this Chapter object, pending its

+  // destruction.

+  void Clear();

+  // If there is no storage remaining on the |displays_| array for a

+  // new display object, creates a new, longer array and copies the

+  // existing Display objects to the new array.  Returns false if the

+  // array cannot be expanded.

+  bool ExpandDisplaysArray();

+  // If |writer| is non-NULL, serialize the Atom sub-element into the

+  // stream.  Returns the total size of the element on success, 0 if

+  // error.

+  uint64_t WriteAtom(IMkvWriter* writer) const;

+  // The string identifier for this chapter (corresponds to WebVTT cue

+  // identifier).

+  char* id_;

+  // Start timecode of the chapter.

+  uint64_t start_timecode_;

+  // Stop timecode of the chapter.

+  uint64_t end_timecode_;

+  // The binary identifier for this chapter.

+  uint64_t uid_;

+  // The Atom element can contain multiple Display sub-elements, as

+  // the same logical title can be rendered in different languages.

+  Display* displays_;

+  // The physical length (total size) of the |displays_| array.

+  int displays_size_;

+  // The logical length (number of active elements) on the |displays_|

+  // array.

+  int displays_count_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Chapter);

+};

+///////////////////////////////////////////////////////////////

+// Chapters element

+//

+class Chapters {

+ public:

+  Chapters();

+  ~Chapters();

+  Chapter* AddChapter(unsigned int* seed);

+  // Returns the number of chapters that have been added.

+  int Count() const;

+  // Output the Chapters element to the writer. Returns true on success.

+  bool Write(IMkvWriter* writer) const;

+ private:

+  // Expands the chapters_ array if there is not enough space to contain

+  // another chapter object.  Returns true on success.

+  bool ExpandChaptersArray();

+  // If |writer| is non-NULL, serialize the Edition sub-element of the

+  // Chapters element into the stream.  Returns the Edition element

+  // size on success, 0 if error.

+  uint64_t WriteEdition(IMkvWriter* writer) const;

+  // Total length of the chapters_ array.

+  int chapters_size_;

+  // Number of active chapters on the chapters_ array.

+  int chapters_count_;

+  // Array for storage of chapter objects.

+  Chapter* chapters_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Chapters);

+};

+///////////////////////////////////////////////////////////////

+// Tag element

+//

+class Tag {

+ public:

+  bool add_simple_tag(const char* tag_name, const char* tag_string);

+ private:

+  // Tags calls Clear and the destructor of Tag

+  friend class Tags;

+  // For storage of simple tags

+  class SimpleTag {

+   public:

+    // Establish representation invariant for new SimpleTag object.

+    void Init();

+    // Reclaim resources, in anticipation of destruction.

+    void Clear();

+    // Copies the title to the |tag_name_| member.  Returns false on

+    // error.

+    bool set_tag_name(const char* tag_name);

+    // Copies the language to the |tag_string_| member.  Returns false

+    // on error.

+    bool set_tag_string(const char* tag_string);

+    // If |writer| is non-NULL, serialize the SimpleTag sub-element of

+    // the Atom into the stream.  Returns the SimpleTag element size on

+    // success, 0 if error.

+    uint64_t Write(IMkvWriter* writer) const;

+   private:

+    char* tag_name_;

+    char* tag_string_;

+  };

+  Tag();

+  ~Tag();

+  // Copies this Tag object to a different one.  This is used when

+  // expanding a plain array of Tag objects (see Tags).

+  void ShallowCopy(Tag* dst) const;

+  // Reclaim resources used by this Tag object, pending its

+  // destruction.

+  void Clear();

+  // If there is no storage remaining on the |simple_tags_| array for a

+  // new display object, creates a new, longer array and copies the

+  // existing SimpleTag objects to the new array.  Returns false if the

+  // array cannot be expanded.

+  bool ExpandSimpleTagsArray();

+  // If |writer| is non-NULL, serialize the Tag sub-element into the

+  // stream.  Returns the total size of the element on success, 0 if

+  // error.

+  uint64_t Write(IMkvWriter* writer) const;

+  // The Atom element can contain multiple SimpleTag sub-elements

+  SimpleTag* simple_tags_;

+  // The physical length (total size) of the |simple_tags_| array.

+  int simple_tags_size_;

+  // The logical length (number of active elements) on the |simple_tags_|

+  // array.

+  int simple_tags_count_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tag);

+};

+///////////////////////////////////////////////////////////////

+// Tags element

+//

+class Tags {

+ public:

+  Tags();

+  ~Tags();

+  Tag* AddTag();

+  // Returns the number of tags that have been added.

+  int Count() const;

+  // Output the Tags element to the writer. Returns true on success.

+  bool Write(IMkvWriter* writer) const;

+ private:

+  // Expands the tags_ array if there is not enough space to contain

+  // another tag object.  Returns true on success.

+  bool ExpandTagsArray();

+  // Total length of the tags_ array.

+  int tags_size_;

+  // Number of active tags on the tags_ array.

+  int tags_count_;

+  // Array for storage of tag objects.

+  Tag* tags_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Tags);

+};

+///////////////////////////////////////////////////////////////

+// Cluster element

+//

+// Notes:

+//  |Init| must be called before any other method in this class.

+class Cluster {

+ public:

+  // |timecode| is the absolute timecode of the cluster. |cues_pos| is the

+  // position for the cluster within the segment that should be written in

+  // the cues element. |timecode_scale| is the timecode scale of the segment.

+  Cluster(uint64_t timecode, int64_t cues_pos, uint64_t timecode_scale,

+          bool write_last_frame_with_duration = false);

+  ~Cluster();

+  bool Init(IMkvWriter* ptr_writer);

+  // Adds a frame to be output in the file. The frame is written out through

+  // |writer_| if successful. Returns true on success.

+  bool AddFrame(const Frame* frame);

+  // Adds a frame to be output in the file. The frame is written out through

+  // |writer_| if successful. Returns true on success.

+  // Inputs:

+  //   data: Pointer to the data

+  //   length: Length of the data

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.  The range of allowed values is [1, 126].

+  //   timecode:     Absolute (not relative to cluster) timestamp of the

+  //                 frame, expressed in timecode units.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrame(const uint8_t* data, uint64_t length, uint64_t track_number,

+                uint64_t timecode,  // timecode units (absolute)

+                bool is_key);

+  // Adds a frame to be output in the file. The frame is written out through

+  // |writer_| if successful. Returns true on success.

+  // Inputs:

+  //   data: Pointer to the data

+  //   length: Length of the data

+  //   additional: Pointer to the additional data

+  //   additional_length: Length of the additional data

+  //   add_id: Value of BlockAddID element

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.  The range of allowed values is [1, 126].

+  //   abs_timecode: Absolute (not relative to cluster) timestamp of the

+  //                 frame, expressed in timecode units.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrameWithAdditional(const uint8_t* data, uint64_t length,

+                              const uint8_t* additional,

+                              uint64_t additional_length, uint64_t add_id,

+                              uint64_t track_number, uint64_t abs_timecode,

+                              bool is_key);

+  // Adds a frame to be output in the file. The frame is written out through

+  // |writer_| if successful. Returns true on success.

+  // Inputs:

+  //   data: Pointer to the data.

+  //   length: Length of the data.

+  //   discard_padding: DiscardPadding element value.

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.  The range of allowed values is [1, 126].

+  //   abs_timecode: Absolute (not relative to cluster) timestamp of the

+  //                 frame, expressed in timecode units.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrameWithDiscardPadding(const uint8_t* data, uint64_t length,

+                                  int64_t discard_padding,

+                                  uint64_t track_number, uint64_t abs_timecode,

+                                  bool is_key);

+  // Writes a frame of metadata to the output medium; returns true on

+  // success.

+  // Inputs:

+  //   data: Pointer to the data

+  //   length: Length of the data

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.  The range of allowed values is [1, 126].

+  //   timecode:     Absolute (not relative to cluster) timestamp of the

+  //                 metadata frame, expressed in timecode units.

+  //   duration:     Duration of metadata frame, in timecode units.

+  //

+  // The metadata frame is written as a block group, with a duration

+  // sub-element but no reference time sub-elements (indicating that

+  // it is considered a keyframe, per Matroska semantics).

+  bool AddMetadata(const uint8_t* data, uint64_t length, uint64_t track_number,

+                   uint64_t timecode, uint64_t duration);

+  // Increments the size of the cluster's data in bytes.

+  void AddPayloadSize(uint64_t size);

+  // Closes the cluster so no more data can be written to it. Will update the

+  // cluster's size if |writer_| is seekable. Returns true on success. This

+  // variant of Finalize() fails when |write_last_frame_with_duration_| is set

+  // to true.

+  bool Finalize();

+  // Closes the cluster so no more data can be written to it. Will update the

+  // cluster's size if |writer_| is seekable. Returns true on success.

+  // Inputs:

+  //   set_last_frame_duration: Boolean indicating whether or not the duration

+  //                            of the last frame should be set. If set to

+  //                            false, the |duration| value is ignored and

+  //                            |write_last_frame_with_duration_| will not be

+  //                            honored.

+  //   duration: Duration of the Cluster in timecode scale.

+  bool Finalize(bool set_last_frame_duration, uint64_t duration);

+  // Returns the size in bytes for the entire Cluster element.

+  uint64_t Size() const;

+  // Given |abs_timecode|, calculates timecode relative to most recent timecode.

+  // Returns -1 on failure, or a relative timecode.

+  int64_t GetRelativeTimecode(int64_t abs_timecode) const;

+  int64_t size_position() const { return size_position_; }

+  int32_t blocks_added() const { return blocks_added_; }

+  uint64_t payload_size() const { return payload_size_; }

+  int64_t position_for_cues() const { return position_for_cues_; }

+  uint64_t timecode() const { return timecode_; }

+  uint64_t timecode_scale() const { return timecode_scale_; }

+  void set_write_last_frame_with_duration(bool write_last_frame_with_duration) {

+    write_last_frame_with_duration_ = write_last_frame_with_duration;

+  }

+  bool write_last_frame_with_duration() const {

+    return write_last_frame_with_duration_;

+  }

+ private:

+  // Iterator type for the |stored_frames_| map.

+  typedef std::map<uint64_t, std::list<Frame*> >::iterator FrameMapIterator;

+  // Utility method that confirms that blocks can still be added, and that the

+  // cluster header has been written. Used by |DoWriteFrame*|. Returns true

+  // when successful.

+  bool PreWriteBlock();

+  // Utility method used by the |DoWriteFrame*| methods that handles the book

+  // keeping required after each block is written.

+  void PostWriteBlock(uint64_t element_size);

+  // Does some verification and calls WriteFrame.

+  bool DoWriteFrame(const Frame* const frame);

+  // Either holds back the given frame, or writes it out depending on whether or

+  // not |write_last_frame_with_duration_| is set.

+  bool QueueOrWriteFrame(const Frame* const frame);

+  // Outputs the Cluster header to |writer_|. Returns true on success.

+  bool WriteClusterHeader();

+  // Number of blocks added to the cluster.

+  int32_t blocks_added_;

+  // Flag telling if the cluster has been closed.

+  bool finalized_;

+  // Flag telling if the cluster's header has been written.

+  bool header_written_;

+  // The size of the cluster elements in bytes.

+  uint64_t payload_size_;

+  // The file position used for cue points.

+  const int64_t position_for_cues_;

+  // The file position of the cluster's size element.

+  int64_t size_position_;

+  // The absolute timecode of the cluster.

+  const uint64_t timecode_;

+  // The timecode scale of the Segment containing the cluster.

+  const uint64_t timecode_scale_;

+  // Flag indicating whether the last frame of the cluster should be written as

+  // a Block with Duration. If set to true, then it will result in holding back

+  // of frames and the parameterized version of Finalize() must be called to

+  // finish writing the Cluster.

+  bool write_last_frame_with_duration_;

+  // Map used to hold back frames, if required. Track number is the key.

+  std::map<uint64_t, std::list<Frame*> > stored_frames_;

+  // Map from track number to the timestamp of the last block written for that

+  // track.

+  std::map<uint64_t, uint64_t> last_block_timestamp_;

+  // Pointer to the writer object. Not owned by this class.

+  IMkvWriter* writer_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Cluster);

+};

+///////////////////////////////////////////////////////////////

+// SeekHead element

+class SeekHead {

+ public:

+  SeekHead();

+  ~SeekHead();

+  // TODO(fgalligan): Change this to reserve a certain size. Then check how

+  // big the seek entry to be added is as not every seek entry will be the

+  // maximum size it could be.

+  // Adds a seek entry to be written out when the element is finalized. |id|

+  // must be the coded mkv element id. |pos| is the file position of the

+  // element. Returns true on success.

+  bool AddSeekEntry(uint32_t id, uint64_t pos);

+  // Writes out SeekHead and SeekEntry elements. Returns true on success.

+  bool Finalize(IMkvWriter* writer) const;

+  // Returns the id of the Seek Entry at the given index. Returns -1 if index is

+  // out of range.

+  uint32_t GetId(int index) const;

+  // Returns the position of the Seek Entry at the given index. Returns -1 if

+  // index is out of range.

+  uint64_t GetPosition(int index) const;

+  // Sets the Seek Entry id and position at given index.

+  // Returns true on success.

+  bool SetSeekEntry(int index, uint32_t id, uint64_t position);

+  // Reserves space by writing out a Void element which will be updated with

+  // a SeekHead element later. Returns true on success.

+  bool Write(IMkvWriter* writer);

+  // We are going to put a cap on the number of Seek Entries.

+  const static int32_t kSeekEntryCount = 5;

+ private:

+  // Returns the maximum size in bytes of one seek entry.

+  uint64_t MaxEntrySize() const;

+  // Seek entry id element list.

+  uint32_t seek_entry_id_[kSeekEntryCount];

+  // Seek entry pos element list.

+  uint64_t seek_entry_pos_[kSeekEntryCount];

+  // The file position of SeekHead element.

+  int64_t start_pos_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(SeekHead);

+};

+///////////////////////////////////////////////////////////////

+// Segment Information element

+class SegmentInfo {

+ public:

+  SegmentInfo();

+  ~SegmentInfo();

+  // Will update the duration if |duration_| is > 0.0. Returns true on success.

+  bool Finalize(IMkvWriter* writer) const;

+  // Sets |muxing_app_| and |writing_app_|.

+  bool Init();

+  // Output the Segment Information element to the writer. Returns true on

+  // success.

+  bool Write(IMkvWriter* writer);

+  void set_duration(double duration) { duration_ = duration; }

+  double duration() const { return duration_; }

+  void set_muxing_app(const char* app);

+  const char* muxing_app() const { return muxing_app_; }

+  void set_timecode_scale(uint64_t scale) { timecode_scale_ = scale; }

+  uint64_t timecode_scale() const { return timecode_scale_; }

+  void set_writing_app(const char* app);

+  const char* writing_app() const { return writing_app_; }

+  void set_date_utc(int64_t date_utc) { date_utc_ = date_utc; }

+  int64_t date_utc() const { return date_utc_; }

+ private:

+  // Segment Information element names.

+  // Initially set to -1 to signify that a duration has not been set and should

+  // not be written out.

+  double duration_;

+  // Set to libwebm-%d.%d.%d.%d, major, minor, build, revision.

+  char* muxing_app_;

+  uint64_t timecode_scale_;

+  // Initially set to libwebm-%d.%d.%d.%d, major, minor, build, revision.

+  char* writing_app_;

+  // LLONG_MIN when DateUTC is not set.

+  int64_t date_utc_;

+  // The file position of the duration element.

+  int64_t duration_pos_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(SegmentInfo);

+};

+///////////////////////////////////////////////////////////////

+// This class represents the main segment in a WebM file. Currently only

+// supports one Segment element.

+//

+// Notes:

+//  |Init| must be called before any other method in this class.

+class Segment {

+ public:

+  enum Mode { kLive = 0x1, kFile = 0x2 };

+  enum CuesPosition {

+    kAfterClusters = 0x0,  // Position Cues after Clusters - Default

+    kBeforeClusters = 0x1  // Position Cues before Clusters

+  };

+  const static uint32_t kDefaultDocTypeVersion = 2;

+  const static uint64_t kDefaultMaxClusterDuration = 30000000000ULL;

+  Segment();

+  ~Segment();

+  // Initializes |SegmentInfo| and returns result. Always returns false when

+  // |ptr_writer| is NULL.

+  bool Init(IMkvWriter* ptr_writer);

+  // Adds a generic track to the segment.  Returns the newly-allocated

+  // track object (which is owned by the segment) on success, NULL on

+  // error. |number| is the number to use for the track.  |number|

+  // must be >= 0. If |number| == 0 then the muxer will decide on the

+  // track number.

+  Track* AddTrack(int32_t number);

+  // Adds a Vorbis audio track to the segment. Returns the number of the track

+  // on success, 0 on error. |number| is the number to use for the audio track.

+  // |number| must be >= 0. If |number| == 0 then the muxer will decide on

+  // the track number.

+  uint64_t AddAudioTrack(int32_t sample_rate, int32_t channels, int32_t number);

+  // Adds an empty chapter to the chapters of this segment.  Returns

+  // non-NULL on success.  After adding the chapter, the caller should

+  // populate its fields via the Chapter member functions.

+  Chapter* AddChapter();

+  // Adds an empty tag to the tags of this segment.  Returns

+  // non-NULL on success.  After adding the tag, the caller should

+  // populate its fields via the Tag member functions.

+  Tag* AddTag();

+  // Adds a cue point to the Cues element. |timestamp| is the time in

+  // nanoseconds of the cue's time. |track| is the Track of the Cue. This

+  // function must be called after AddFrame to calculate the correct

+  // BlockNumber for the CuePoint. Returns true on success.

+  bool AddCuePoint(uint64_t timestamp, uint64_t track);

+  // Adds a frame to be output in the file. Returns true on success.

+  // Inputs:

+  //   data: Pointer to the data

+  //   length: Length of the data

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.

+  //   timestamp:    Timestamp of the frame in nanoseconds from 0.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrame(const uint8_t* data, uint64_t length, uint64_t track_number,

+                uint64_t timestamp_ns, bool is_key);

+  // Writes a frame of metadata to the output medium; returns true on

+  // success.

+  // Inputs:

+  //   data: Pointer to the data

+  //   length: Length of the data

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.

+  //   timecode:     Absolute timestamp of the metadata frame, expressed

+  //                 in nanosecond units.

+  //   duration:     Duration of metadata frame, in nanosecond units.

+  //

+  // The metadata frame is written as a block group, with a duration

+  // sub-element but no reference time sub-elements (indicating that

+  // it is considered a keyframe, per Matroska semantics).

+  bool AddMetadata(const uint8_t* data, uint64_t length, uint64_t track_number,

+                   uint64_t timestamp_ns, uint64_t duration_ns);

+  // Writes a frame with additional data to the output medium; returns true on

+  // success.

+  // Inputs:

+  //   data: Pointer to the data.

+  //   length: Length of the data.

+  //   additional: Pointer to additional data.

+  //   additional_length: Length of additional data.

+  //   add_id: Additional ID which identifies the type of additional data.

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.

+  //   timestamp:    Absolute timestamp of the frame, expressed in nanosecond

+  //                 units.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrameWithAdditional(const uint8_t* data, uint64_t length,

+                              const uint8_t* additional,

+                              uint64_t additional_length, uint64_t add_id,

+                              uint64_t track_number, uint64_t timestamp,

+                              bool is_key);

+  // Writes a frame with DiscardPadding to the output medium; returns true on

+  // success.

+  // Inputs:

+  //   data: Pointer to the data.

+  //   length: Length of the data.

+  //   discard_padding: DiscardPadding element value.

+  //   track_number: Track to add the data to. Value returned by Add track

+  //                 functions.

+  //   timestamp:    Absolute timestamp of the frame, expressed in nanosecond

+  //                 units.

+  //   is_key:       Flag telling whether or not this frame is a key frame.

+  bool AddFrameWithDiscardPadding(const uint8_t* data, uint64_t length,

+                                  int64_t discard_padding,

+                                  uint64_t track_number, uint64_t timestamp,

+                                  bool is_key);

+  // Writes a Frame to the output medium. Chooses the correct way of writing

+  // the frame (Block vs SimpleBlock) based on the parameters passed.

+  // Inputs:

+  //   frame: frame object

+  bool AddGenericFrame(const Frame* frame);

+  // Adds a VP8 video track to the segment. Returns the number of the track on

+  // success, 0 on error. |number| is the number to use for the video track.

+  // |number| must be >= 0. If |number| == 0 then the muxer will decide on

+  // the track number.

+  uint64_t AddVideoTrack(int32_t width, int32_t height, int32_t number);

+  // This function must be called after Finalize() if you need a copy of the

+  // output with Cues written before the Clusters. It will return false if the

+  // writer is not seekable of if chunking is set to true.

+  // Input parameters:

+  // reader - an IMkvReader object created with the same underlying file of the

+  //          current writer object. Make sure to close the existing writer

+  //          object before creating this so that all the data is properly

+  //          flushed and available for reading.

+  // writer - an IMkvWriter object pointing to a *different* file than the one

+  //          pointed by the current writer object. This file will contain the

+  //          Cues element before the Clusters.

+  bool CopyAndMoveCuesBeforeClusters(mkvparser::IMkvReader* reader,

+                                     IMkvWriter* writer);

+  // Sets which track to use for the Cues element. Must have added the track

+  // before calling this function. Returns true on success. |track_number| is

+  // returned by the Add track functions.

+  bool CuesTrack(uint64_t track_number);

+  // This will force the muxer to create a new Cluster when the next frame is

+  // added.

+  void ForceNewClusterOnNextFrame();

+  // Writes out any frames that have not been written out. Finalizes the last

+  // cluster. May update the size and duration of the segment. May output the

+  // Cues element. May finalize the SeekHead element. Returns true on success.

+  bool Finalize();

+  // Returns the Cues object.

+  Cues* GetCues() { return &cues_; }

+  // Returns the Segment Information object.

+  const SegmentInfo* GetSegmentInfo() const { return &segment_info_; }

+  SegmentInfo* GetSegmentInfo() { return &segment_info_; }

+  // Search the Tracks and return the track that matches |track_number|.

+  // Returns NULL if there is no track match.

+  Track* GetTrackByNumber(uint64_t track_number) const;

+  // Toggles whether to output a cues element.

+  void OutputCues(bool output_cues);

+  // Toggles whether to write the last frame in each Cluster with Duration.

+  void AccurateClusterDuration(bool accurate_cluster_duration);

+  // Sets if the muxer will output files in chunks or not. |chunking| is a

+  // flag telling whether or not to turn on chunking. |filename| is the base

+  // filename for the chunk files. The header chunk file will be named

+  // |filename|.hdr and the data chunks will be named

+  // |filename|_XXXXXX.chk. Chunking implies that the muxer will be writing

+  // to files so the muxer will use the default MkvWriter class to control

+  // what data is written to what files. Returns true on success.

+  // TODO: Should we change the IMkvWriter Interface to add Open and Close?

+  // That will force the interface to be dependent on files.

+  bool SetChunking(bool chunking, const char* filename);

+  bool chunking() const { return chunking_; }

+  uint64_t cues_track() const { return cues_track_; }

+  void set_max_cluster_duration(uint64_t max_cluster_duration) {

+    max_cluster_duration_ = max_cluster_duration;

+  }

+  uint64_t max_cluster_duration() const { return max_cluster_duration_; }

+  void set_max_cluster_size(uint64_t max_cluster_size) {

+    max_cluster_size_ = max_cluster_size;

+  }

+  uint64_t max_cluster_size() const { return max_cluster_size_; }

+  void set_mode(Mode mode) { mode_ = mode; }

+  Mode mode() const { return mode_; }

+  CuesPosition cues_position() const { return cues_position_; }

+  bool output_cues() const { return output_cues_; }

+  const SegmentInfo* segment_info() const { return &segment_info_; }

+ private:

+  // Checks if header information has been output and initialized. If not it

+  // will output the Segment element and initialize the SeekHead elment and

+  // Cues elements.

+  bool CheckHeaderInfo();

+  // Sets |doc_type_version_| based on the current element requirements.

+  void UpdateDocTypeVersion();

+  // Sets |name| according to how many chunks have been written. |ext| is the

+  // file extension. |name| must be deleted by the calling app. Returns true

+  // on success.

+  bool UpdateChunkName(const char* ext, char** name) const;

+  // Returns the maximum offset within the segment's payload. When chunking

+  // this function is needed to determine offsets of elements within the

+  // chunked files. Returns -1 on error.

+  int64_t MaxOffset();

+  // Adds the frame to our frame array.

+  bool QueueFrame(Frame* frame);

+  // Output all frames that are queued. Returns -1 on error, otherwise

+  // it returns the number of frames written.

+  int WriteFramesAll();

+  // Output all frames that are queued that have an end time that is less

+  // then |timestamp|. Returns true on success and if there are no frames

+  // queued.

+  bool WriteFramesLessThan(uint64_t timestamp);

+  // Outputs the segment header, Segment Information element, SeekHead element,

+  // and Tracks element to |writer_|.

+  bool WriteSegmentHeader();

+  // Given a frame with the specified timestamp (nanosecond units) and

+  // keyframe status, determine whether a new cluster should be

+  // created, before writing enqueued frames and the frame itself. The

+  // function returns one of the following values:

+  //  -1 = error: an out-of-order frame was detected

+  //  0 = do not create a new cluster, and write frame to the existing cluster

+  //  1 = create a new cluster, and write frame to that new cluster

+  //  2 = create a new cluster, and re-run test

+  int TestFrame(uint64_t track_num, uint64_t timestamp_ns, bool key) const;

+  // Create a new cluster, using the earlier of the first enqueued

+  // frame, or the indicated time. Returns true on success.

+  bool MakeNewCluster(uint64_t timestamp_ns);

+  // Checks whether a new cluster needs to be created, and if so

+  // creates a new cluster. Returns false if creation of a new cluster

+  // was necessary but creation was not successful.

+  bool DoNewClusterProcessing(uint64_t track_num, uint64_t timestamp_ns,

+                              bool key);

+  // Adjusts Cue Point values (to place Cues before Clusters) so that they

+  // reflect the correct offsets.

+  void MoveCuesBeforeClusters();

+  // This function recursively computes the correct cluster offsets (this is

+  // done to move the Cues before Clusters). It recursively updates the change

+  // in size (which indicates a change in cluster offset) until no sizes change.

+  // Parameters:

+  // diff - indicates the difference in size of the Cues element that needs to

+  //        accounted for.

+  // index - index in the list of Cues which is currently being adjusted.

+  // cue_size - sum of size of all the CuePoint elements.

+  void MoveCuesBeforeClustersHelper(uint64_t diff, int index,

+                                    uint64_t* cue_size);

+  // Seeds the random number generator used to make UIDs.

+  unsigned int seed_;

+  // WebM elements

+  Cues cues_;

+  SeekHead seek_head_;

+  SegmentInfo segment_info_;

+  Tracks tracks_;

+  Chapters chapters_;

+  Tags tags_;

+  // Number of chunks written.

+  int chunk_count_;

+  // Current chunk filename.

+  char* chunk_name_;

+  // Default MkvWriter object created by this class used for writing clusters

+  // out in separate files.

+  MkvWriter* chunk_writer_cluster_;

+  // Default MkvWriter object created by this class used for writing Cues

+  // element out to a file.

+  MkvWriter* chunk_writer_cues_;

+  // Default MkvWriter object created by this class used for writing the

+  // Matroska header out to a file.

+  MkvWriter* chunk_writer_header_;

+  // Flag telling whether or not the muxer is chunking output to multiple

+  // files.

+  bool chunking_;

+  // Base filename for the chunked files.

+  char* chunking_base_name_;

+  // File position offset where the Clusters end.

+  int64_t cluster_end_offset_;

+  // List of clusters.

+  Cluster** cluster_list_;

+  // Number of cluster pointers allocated in the cluster list.

+  int32_t cluster_list_capacity_;

+  // Number of clusters in the cluster list.

+  int32_t cluster_list_size_;

+  // Indicates whether Cues should be written before or after Clusters

+  CuesPosition cues_position_;

+  // Track number that is associated with the cues element for this segment.

+  uint64_t cues_track_;

+  // Tells the muxer to force a new cluster on the next Block.

+  bool force_new_cluster_;

+  // List of stored audio frames. These variables are used to store frames so

+  // the muxer can follow the guideline "Audio blocks that contain the video

+  // key frame's timecode should be in the same cluster as the video key frame

+  // block."

+  Frame** frames_;

+  // Number of frame pointers allocated in the frame list.

+  int32_t frames_capacity_;

+  // Number of frames in the frame list.

+  int32_t frames_size_;

+  // Flag telling if a video track has been added to the segment.

+  bool has_video_;

+  // Flag telling if the segment's header has been written.

+  bool header_written_;

+  // Duration of the last block in nanoseconds.

+  uint64_t last_block_duration_;

+  // Last timestamp in nanoseconds added to a cluster.

+  uint64_t last_timestamp_;

+  // Last timestamp in nanoseconds by track number added to a cluster.

+  uint64_t last_track_timestamp_[kMaxTrackNumber];

+  // Maximum time in nanoseconds for a cluster duration. This variable is a

+  // guideline and some clusters may have a longer duration. Default is 30

+  // seconds.

+  uint64_t max_cluster_duration_;

+  // Maximum size in bytes for a cluster. This variable is a guideline and

+  // some clusters may have a larger size. Default is 0 which signifies that

+  // the muxer will decide the size.

+  uint64_t max_cluster_size_;

+  // The mode that segment is in. If set to |kLive| the writer must not

+  // seek backwards.

+  Mode mode_;

+  // Flag telling the muxer that a new cue point should be added.

+  bool new_cuepoint_;

+  // TODO(fgalligan): Should we add support for more than one Cues element?

+  // Flag whether or not the muxer should output a Cues element.

+  bool output_cues_;

+  // Flag whether or not the last frame in each Cluster will have a Duration

+  // element in it.

+  bool accurate_cluster_duration_;

+  // The size of the EBML header, used to validate the header if

+  // WriteEbmlHeader() is called more than once.

+  int32_t ebml_header_size_;

+  // The file position of the segment's payload.

+  int64_t payload_pos_;

+  // The file position of the element's size.

+  int64_t size_position_;

+  // Current DocTypeVersion (|doc_type_version_|) and that written in

+  // WriteSegmentHeader().

+  // WriteEbmlHeader() will be called from Finalize() if |doc_type_version_|

+  // differs from |doc_type_version_written_|.

+  uint32_t doc_type_version_;

+  uint32_t doc_type_version_written_;

+  // Pointer to the writer objects. Not owned by this class.

+  IMkvWriter* writer_cluster_;

+  IMkvWriter* writer_cues_;

+  IMkvWriter* writer_header_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(Segment);

+};

+}  // namespace mkvmuxer

+#endif  // MKVMUXER_MKVMUXER_H_

\ No newline at end of file

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvmuxertypes.h

@@ -1,0 +1,19 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVMUXER_MKVMUXERTYPES_H_

+#define MKVMUXER_MKVMUXERTYPES_H_

+// Copied from Chromium basictypes.h

+// A macro to disallow the copy constructor and operator= functions

+// This should be used in the private: declarations for a class

+#define LIBWEBM_DISALLOW_COPY_AND_ASSIGN(TypeName) \

+  TypeName(const TypeName&);                       \

+  void operator=(const TypeName&)

+#endif  // MKVMUXER_MKVMUXERTYPES_HPP_

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc

@@ -1,0 +1,635 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "mkvmuxer/mkvmuxerutil.h"

+#ifdef __ANDROID__

+#include <fcntl.h>

+#endif

+#include <cassert>

+#include <cmath>

+#include <cstdio>

+#include <cstdlib>

+#include <cstring>

+#include <ctime>

+#include <new>

+#include "common/webmids.h"

+#include "mkvmuxer/mkvmuxer.h"

+#include "mkvmuxer/mkvwriter.h"

+namespace mkvmuxer {

+namespace {

+// Date elements are always 8 octets in size.

+const int kDateElementSize = 8;

+uint64_t WriteBlock(IMkvWriter* writer, const Frame* const frame,

+                    int64_t timecode, uint64_t timecode_scale) {

+  uint64_t block_additional_elem_size = 0;

+  uint64_t block_addid_elem_size = 0;

+  uint64_t block_more_payload_size = 0;

+  uint64_t block_more_elem_size = 0;

+  uint64_t block_additions_payload_size = 0;

+  uint64_t block_additions_elem_size = 0;

+  if (frame->additional()) {

+    block_additional_elem_size =

+        EbmlElementSize(libwebm::kMkvBlockAdditional, frame->additional(),

+                        frame->additional_length());

+    block_addid_elem_size =

+        EbmlElementSize(libwebm::kMkvBlockAddID, frame->add_id());

+    block_more_payload_size =

+        block_addid_elem_size + block_additional_elem_size;

+    block_more_elem_size =

+        EbmlMasterElementSize(libwebm::kMkvBlockMore, block_more_payload_size) +

+        block_more_payload_size;

+    block_additions_payload_size = block_more_elem_size;

+    block_additions_elem_size =

+        EbmlMasterElementSize(libwebm::kMkvBlockAdditions,

+                              block_additions_payload_size) +

+        block_additions_payload_size;

+  }

+  uint64_t discard_padding_elem_size = 0;

+  if (frame->discard_padding() != 0) {

+    discard_padding_elem_size =

+        EbmlElementSize(libwebm::kMkvDiscardPadding, frame->discard_padding());

+  }

+  const uint64_t reference_block_timestamp =

+      frame->reference_block_timestamp() / timecode_scale;

+  uint64_t reference_block_elem_size = 0;

+  if (!frame->is_key()) {

+    reference_block_elem_size =

+        EbmlElementSize(libwebm::kMkvReferenceBlock, reference_block_timestamp);

+  }

+  const uint64_t duration = frame->duration() / timecode_scale;

+  uint64_t block_duration_elem_size = 0;

+  if (duration > 0)

+    block_duration_elem_size =

+        EbmlElementSize(libwebm::kMkvBlockDuration, duration);

+  const uint64_t block_payload_size = 4 + frame->length();

+  const uint64_t block_elem_size =

+      EbmlMasterElementSize(libwebm::kMkvBlock, block_payload_size) +

+      block_payload_size;

+  const uint64_t block_group_payload_size =

+      block_elem_size + block_additions_elem_size + block_duration_elem_size +

+      discard_padding_elem_size + reference_block_elem_size;

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvBlockGroup,

+                              block_group_payload_size)) {

+    return 0;

+  }

+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvBlock, block_payload_size))

+    return 0;

+  if (WriteUInt(writer, frame->track_number()))

+    return 0;

+  if (SerializeInt(writer, timecode, 2))

+    return 0;

+  // For a Block, flags is always 0.

+  if (SerializeInt(writer, 0, 1))

+    return 0;

+  if (writer->Write(frame->frame(), static_cast<uint32_t>(frame->length())))

+    return 0;

+  if (frame->additional()) {

+    if (!WriteEbmlMasterElement(writer, libwebm::kMkvBlockAdditions,

+                                block_additions_payload_size)) {

+      return 0;

+    }

+    if (!WriteEbmlMasterElement(writer, libwebm::kMkvBlockMore,

+                                block_more_payload_size))

+      return 0;

+    if (!WriteEbmlElement(writer, libwebm::kMkvBlockAddID, frame->add_id()))

+      return 0;

+    if (!WriteEbmlElement(writer, libwebm::kMkvBlockAdditional,

+                          frame->additional(), frame->additional_length())) {

+      return 0;

+    }

+  }

+  if (frame->discard_padding() != 0 &&

+      !WriteEbmlElement(writer, libwebm::kMkvDiscardPadding,

+                        frame->discard_padding())) {

+    return false;

+  }

+  if (!frame->is_key() &&

+      !WriteEbmlElement(writer, libwebm::kMkvReferenceBlock,

+                        reference_block_timestamp)) {

+    return false;

+  }

+  if (duration > 0 &&

+      !WriteEbmlElement(writer, libwebm::kMkvBlockDuration, duration)) {

+    return false;

+  }

+  return EbmlMasterElementSize(libwebm::kMkvBlockGroup,

+                               block_group_payload_size) +

+         block_group_payload_size;

+}

+uint64_t WriteSimpleBlock(IMkvWriter* writer, const Frame* const frame,

+                          int64_t timecode) {

+  if (WriteID(writer, libwebm::kMkvSimpleBlock))

+    return 0;

+  const int32_t size = static_cast<int32_t>(frame->length()) + 4;

+  if (WriteUInt(writer, size))

+    return 0;

+  if (WriteUInt(writer, static_cast<uint64_t>(frame->track_number())))

+    return 0;

+  if (SerializeInt(writer, timecode, 2))

+    return 0;

+  uint64_t flags = 0;

+  if (frame->is_key())

+    flags |= 0x80;

+  if (SerializeInt(writer, flags, 1))

+    return 0;

+  if (writer->Write(frame->frame(), static_cast<uint32_t>(frame->length())))

+    return 0;

+  return GetUIntSize(libwebm::kMkvSimpleBlock) + GetCodedUIntSize(size) + 4 +

+         frame->length();

+}

+}  // namespace

+int32_t GetCodedUIntSize(uint64_t value) {

+  if (value < 0x000000000000007FULL)

+    return 1;

+  else if (value < 0x0000000000003FFFULL)

+    return 2;

+  else if (value < 0x00000000001FFFFFULL)

+    return 3;

+  else if (value < 0x000000000FFFFFFFULL)

+    return 4;

+  else if (value < 0x00000007FFFFFFFFULL)

+    return 5;

+  else if (value < 0x000003FFFFFFFFFFULL)

+    return 6;

+  else if (value < 0x0001FFFFFFFFFFFFULL)

+    return 7;

+  return 8;

+}

+int32_t GetUIntSize(uint64_t value) {

+  if (value < 0x0000000000000100ULL)

+    return 1;

+  else if (value < 0x0000000000010000ULL)

+    return 2;

+  else if (value < 0x0000000001000000ULL)

+    return 3;

+  else if (value < 0x0000000100000000ULL)

+    return 4;

+  else if (value < 0x0000010000000000ULL)

+    return 5;

+  else if (value < 0x0001000000000000ULL)

+    return 6;

+  else if (value < 0x0100000000000000ULL)

+    return 7;

+  return 8;

+}

+int32_t GetIntSize(int64_t value) {

+  // Doubling the requested value ensures positive values with their high bit

+  // set are written with 0-padding to avoid flipping the signedness.

+  const uint64_t v = (value < 0) ? value ^ -1LL : value;

+  return GetUIntSize(2 * v);

+}

+uint64_t EbmlMasterElementSize(uint64_t type, uint64_t value) {

+  // Size of EBML ID

+  int32_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += GetCodedUIntSize(value);

+  return ebml_size;

+}

+uint64_t EbmlElementSize(uint64_t type, int64_t value) {

+  // Size of EBML ID

+  int32_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += GetIntSize(value);

+  // Size of Datasize

+  ebml_size++;

+  return ebml_size;

+}

+uint64_t EbmlElementSize(uint64_t type, uint64_t value) {

+  // Size of EBML ID

+  int32_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += GetUIntSize(value);

+  // Size of Datasize

+  ebml_size++;

+  return ebml_size;

+}

+uint64_t EbmlElementSize(uint64_t type, float /* value */) {

+  // Size of EBML ID

+  uint64_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += sizeof(float);

+  // Size of Datasize

+  ebml_size++;

+  return ebml_size;

+}

+uint64_t EbmlElementSize(uint64_t type, const char* value) {

+  if (!value)

+    return 0;

+  // Size of EBML ID

+  uint64_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += strlen(value);

+  // Size of Datasize

+  ebml_size++;

+  return ebml_size;

+}

+uint64_t EbmlElementSize(uint64_t type, const uint8_t* value, uint64_t size) {

+  if (!value)

+    return 0;

+  // Size of EBML ID

+  uint64_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += size;

+  // Size of Datasize

+  ebml_size += GetCodedUIntSize(size);

+  return ebml_size;

+}

+uint64_t EbmlDateElementSize(uint64_t type) {

+  // Size of EBML ID

+  uint64_t ebml_size = GetUIntSize(type);

+  // Datasize

+  ebml_size += kDateElementSize;

+  // Size of Datasize

+  ebml_size++;

+  return ebml_size;

+}

+int32_t SerializeInt(IMkvWriter* writer, int64_t value, int32_t size) {

+  if (!writer || size < 1 || size > 8)

+    return -1;

+  for (int32_t i = 1; i <= size; ++i) {

+    const int32_t byte_count = size - i;

+    const int32_t bit_count = byte_count * 8;

+    const int64_t bb = value >> bit_count;

+    const uint8_t b = static_cast<uint8_t>(bb);

+    const int32_t status = writer->Write(&b, 1);

+    if (status < 0)

+      return status;

+  }

+  return 0;

+}

+int32_t SerializeFloat(IMkvWriter* writer, float f) {

+  if (!writer)

+    return -1;

+  assert(sizeof(uint32_t) == sizeof(float));

+  // This union is merely used to avoid a reinterpret_cast from float& to

+  // uint32& which will result in violation of strict aliasing.

+  union U32 {

+    uint32_t u32;

+    float f;

+  } value;

+  value.f = f;

+  for (int32_t i = 1; i <= 4; ++i) {

+    const int32_t byte_count = 4 - i;

+    const int32_t bit_count = byte_count * 8;

+    const uint8_t byte = static_cast<uint8_t>(value.u32 >> bit_count);

+    const int32_t status = writer->Write(&byte, 1);

+    if (status < 0)

+      return status;

+  }

+  return 0;

+}

+int32_t WriteUInt(IMkvWriter* writer, uint64_t value) {

+  if (!writer)

+    return -1;

+  int32_t size = GetCodedUIntSize(value);

+  return WriteUIntSize(writer, value, size);

+}

+int32_t WriteUIntSize(IMkvWriter* writer, uint64_t value, int32_t size) {

+  if (!writer || size < 0 || size > 8)

+    return -1;

+  if (size > 0) {

+    const uint64_t bit = 1LL << (size * 7);

+    if (value > (bit - 2))

+      return -1;

+    value |= bit;

+  } else {

+    size = 1;

+    int64_t bit;

+    for (;;) {

+      bit = 1LL << (size * 7);

+      const uint64_t max = bit - 2;

+      if (value <= max)

+        break;

+      ++size;

+    }

+    if (size > 8)

+      return false;

+    value |= bit;

+  }

+  return SerializeInt(writer, value, size);

+}

+int32_t WriteID(IMkvWriter* writer, uint64_t type) {

+  if (!writer)

+    return -1;

+  writer->ElementStartNotify(type, writer->Position());

+  const int32_t size = GetUIntSize(type);

+  return SerializeInt(writer, type, size);

+}

+bool WriteEbmlMasterElement(IMkvWriter* writer, uint64_t type, uint64_t size) {

+  if (!writer)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  if (WriteUInt(writer, size))

+    return false;

+  return true;

+}

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, uint64_t value) {

+  if (!writer)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  const uint64_t size = GetUIntSize(value);

+  if (WriteUInt(writer, size))

+    return false;

+  if (SerializeInt(writer, value, static_cast<int32_t>(size)))

+    return false;

+  return true;

+}

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, int64_t value) {

+  if (!writer)

+    return false;

+  if (WriteID(writer, type))

+    return 0;

+  const uint64_t size = GetIntSize(value);

+  if (WriteUInt(writer, size))

+    return false;

+  if (SerializeInt(writer, value, static_cast<int32_t>(size)))

+    return false;

+  return true;

+}

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, float value) {

+  if (!writer)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  if (WriteUInt(writer, 4))

+    return false;

+  if (SerializeFloat(writer, value))

+    return false;

+  return true;

+}

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, const char* value) {

+  if (!writer || !value)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  const uint64_t length = strlen(value);

+  if (WriteUInt(writer, length))

+    return false;

+  if (writer->Write(value, static_cast<const uint32_t>(length)))

+    return false;

+  return true;

+}

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, const uint8_t* value,

+                      uint64_t size) {

+  if (!writer || !value || size < 1)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  if (WriteUInt(writer, size))

+    return false;

+  if (writer->Write(value, static_cast<uint32_t>(size)))

+    return false;

+  return true;

+}

+bool WriteEbmlDateElement(IMkvWriter* writer, uint64_t type, int64_t value) {

+  if (!writer)

+    return false;

+  if (WriteID(writer, type))

+    return false;

+  if (WriteUInt(writer, kDateElementSize))

+    return false;

+  if (SerializeInt(writer, value, kDateElementSize))

+    return false;

+  return true;

+}

+uint64_t WriteFrame(IMkvWriter* writer, const Frame* const frame,

+                    Cluster* cluster) {

+  if (!writer || !frame || !frame->IsValid() || !cluster ||

+      !cluster->timecode_scale())

+    return 0;

+  //  Technically the timecode for a block can be less than the

+  //  timecode for the cluster itself (remember that block timecode

+  //  is a signed, 16-bit integer).  However, as a simplification we

+  //  only permit non-negative cluster-relative timecodes for blocks.

+  const int64_t relative_timecode = cluster->GetRelativeTimecode(

+      frame->timestamp() / cluster->timecode_scale());

+  if (relative_timecode < 0 || relative_timecode > kMaxBlockTimecode)

+    return 0;

+  return frame->CanBeSimpleBlock() ?

+             WriteSimpleBlock(writer, frame, relative_timecode) :

+             WriteBlock(writer, frame, relative_timecode,

+                        cluster->timecode_scale());

+}

+uint64_t WriteVoidElement(IMkvWriter* writer, uint64_t size) {

+  if (!writer)

+    return false;

+  // Subtract one for the void ID and the coded size.

+  uint64_t void_entry_size = size - 1 - GetCodedUIntSize(size - 1);

+  uint64_t void_size =

+      EbmlMasterElementSize(libwebm::kMkvVoid, void_entry_size) +

+      void_entry_size;

+  if (void_size != size)

+    return 0;

+  const int64_t payload_position = writer->Position();

+  if (payload_position < 0)

+    return 0;

+  if (WriteID(writer, libwebm::kMkvVoid))

+    return 0;

+  if (WriteUInt(writer, void_entry_size))

+    return 0;

+  const uint8_t value = 0;

+  for (int32_t i = 0; i < static_cast<int32_t>(void_entry_size); ++i) {

+    if (writer->Write(&value, 1))

+      return 0;

+  }

+  const int64_t stop_position = writer->Position();

+  if (stop_position < 0 ||

+      stop_position - payload_position != static_cast<int64_t>(void_size))

+    return 0;

+  return void_size;

+}

+void GetVersion(int32_t* major, int32_t* minor, int32_t* build,

+                int32_t* revision) {

+  *major = 0;

+  *minor = 2;

+  *build = 1;

+  *revision = 0;

+}

+uint64_t MakeUID(unsigned int* seed) {

+  uint64_t uid = 0;

+#ifdef __MINGW32__

+  srand(*seed);

+#endif

+  for (int i = 0; i < 7; ++i) {  // avoid problems with 8-byte values

+    uid <<= 8;

+// TODO(fgalligan): Move random number generation to platform specific code.

+#ifdef _MSC_VER

+    (void)seed;

+    const int32_t nn = rand();

+#elif __ANDROID__

+    int32_t temp_num = 1;

+    int fd = open("/dev/urandom", O_RDONLY);

+    if (fd != -1) {

+      read(fd, &temp_num, sizeof(temp_num));

+      close(fd);

+    }

+    const int32_t nn = temp_num;

+#elif defined __MINGW32__

+    const int32_t nn = rand();

+#else

+    const int32_t nn = rand_r(seed);

+#endif

+    const int32_t n = 0xFF & (nn >> 4);  // throw away low-order bits

+    uid |= n;

+  }

+  return uid;

+}

+}  // namespace mkvmuxer

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvmuxerutil.h

@@ -1,0 +1,83 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVMUXER_MKVMUXERUTIL_H_

+#define MKVMUXER_MKVMUXERUTIL_H_

+#include <stdint.h>

+namespace mkvmuxer {

+class Cluster;

+class Frame;

+class IMkvWriter;

+const uint64_t kEbmlUnknownValue = 0x01FFFFFFFFFFFFFFULL;

+const int64_t kMaxBlockTimecode = 0x07FFFLL;

+// Writes out |value| in Big Endian order. Returns 0 on success.

+int32_t SerializeInt(IMkvWriter* writer, int64_t value, int32_t size);

+// Returns the size in bytes of the element.

+int32_t GetUIntSize(uint64_t value);

+int32_t GetIntSize(int64_t value);

+int32_t GetCodedUIntSize(uint64_t value);

+uint64_t EbmlMasterElementSize(uint64_t type, uint64_t value);

+uint64_t EbmlElementSize(uint64_t type, int64_t value);

+uint64_t EbmlElementSize(uint64_t type, uint64_t value);

+uint64_t EbmlElementSize(uint64_t type, float value);

+uint64_t EbmlElementSize(uint64_t type, const char* value);

+uint64_t EbmlElementSize(uint64_t type, const uint8_t* value, uint64_t size);

+uint64_t EbmlDateElementSize(uint64_t type);

+// Creates an EBML coded number from |value| and writes it out. The size of

+// the coded number is determined by the value of |value|. |value| must not

+// be in a coded form. Returns 0 on success.

+int32_t WriteUInt(IMkvWriter* writer, uint64_t value);

+// Creates an EBML coded number from |value| and writes it out. The size of

+// the coded number is determined by the value of |size|. |value| must not

+// be in a coded form. Returns 0 on success.

+int32_t WriteUIntSize(IMkvWriter* writer, uint64_t value, int32_t size);

+// Output an Mkv master element. Returns true if the element was written.

+bool WriteEbmlMasterElement(IMkvWriter* writer, uint64_t value, uint64_t size);

+// Outputs an Mkv ID, calls |IMkvWriter::ElementStartNotify|, and passes the

+// ID to |SerializeInt|. Returns 0 on success.

+int32_t WriteID(IMkvWriter* writer, uint64_t type);

+// Output an Mkv non-master element. Returns true if the element was written.

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, uint64_t value);

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, int64_t value);

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, float value);

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, const char* value);

+bool WriteEbmlElement(IMkvWriter* writer, uint64_t type, const uint8_t* value,

+                      uint64_t size);

+bool WriteEbmlDateElement(IMkvWriter* writer, uint64_t type, int64_t value);

+// Output a Mkv Frame. It decides the correct element to write (Block vs

+// SimpleBlock) based on the parameters of the Frame.

+uint64_t WriteFrame(IMkvWriter* writer, const Frame* const frame,

+                    Cluster* cluster);

+// Output a void element. |size| must be the entire size in bytes that will be

+// void. The function will calculate the size of the void header and subtract

+// it from |size|.

+uint64_t WriteVoidElement(IMkvWriter* writer, uint64_t size);

+// Returns the version number of the muxer in |major|, |minor|, |build|,

+// and |revision|.

+void GetVersion(int32_t* major, int32_t* minor, int32_t* build,

+                int32_t* revision);

+// Returns a random number to be used for UID, using |seed| to seed

+// the random-number generator (see POSIX rand_r() for semantics).

+uint64_t MakeUID(unsigned int* seed);

+}  // namespace mkvmuxer

+#endif  // MKVMUXER_MKVMUXERUTIL_H_

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvwriter.cc

@@ -1,0 +1,88 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "mkvmuxer/mkvwriter.h"

+#ifdef _MSC_VER

+#include <share.h>  // for _SH_DENYWR

+#endif

+namespace mkvmuxer {

+MkvWriter::MkvWriter() : file_(NULL), writer_owns_file_(true) {}

+MkvWriter::MkvWriter(FILE* fp) : file_(fp), writer_owns_file_(false) {}

+MkvWriter::~MkvWriter() { Close(); }

+int32_t MkvWriter::Write(const void* buffer, uint32_t length) {

+  if (!file_)

+    return -1;

+  if (length == 0)

+    return 0;

+  if (buffer == NULL)

+    return -1;

+  const size_t bytes_written = fwrite(buffer, 1, length, file_);

+  return (bytes_written == length) ? 0 : -1;

+}

+bool MkvWriter::Open(const char* filename) {

+  if (filename == NULL)

+    return false;

+  if (file_)

+    return false;

+#ifdef _MSC_VER

+  file_ = _fsopen(filename, "wb", _SH_DENYWR);

+#else

+  file_ = fopen(filename, "wb");

+#endif

+  if (file_ == NULL)

+    return false;

+  return true;

+}

+void MkvWriter::Close() {

+  if (file_ && writer_owns_file_) {

+    fclose(file_);

+  }

+  file_ = NULL;

+}

+int64_t MkvWriter::Position() const {

+  if (!file_)

+    return 0;

+#ifdef _MSC_VER

+  return _ftelli64(file_);

+#else

+  return ftell(file_);

+#endif

+}

+int32_t MkvWriter::Position(int64_t position) {

+  if (!file_)

+    return -1;

+#ifdef _MSC_VER

+  return _fseeki64(file_, position, SEEK_SET);

+#else

+  return fseek(file_, position, SEEK_SET);

+#endif

+}

+bool MkvWriter::Seekable() const { return true; }

+void MkvWriter::ElementStartNotify(uint64_t, int64_t) {}

+}  // namespace mkvmuxer

--- /dev/null

+++ b/third_party/libwebm/mkvmuxer/mkvwriter.h

@@ -1,0 +1,51 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVMUXER_MKVWRITER_H_

+#define MKVMUXER_MKVWRITER_H_

+#include <stdio.h>

+#include "mkvmuxer/mkvmuxer.h"

+#include "mkvmuxer/mkvmuxertypes.h"

+namespace mkvmuxer {

+// Default implementation of the IMkvWriter interface on Windows.

+class MkvWriter : public IMkvWriter {

+ public:

+  MkvWriter();

+  explicit MkvWriter(FILE* fp);

+  virtual ~MkvWriter();

+  // IMkvWriter interface

+  virtual int64_t Position() const;

+  virtual int32_t Position(int64_t position);

+  virtual bool Seekable() const;

+  virtual int32_t Write(const void* buffer, uint32_t length);

+  virtual void ElementStartNotify(uint64_t element_id, int64_t position);

+  // Creates and opens a file for writing. |filename| is the name of the file

+  // to open. This function will overwrite the contents of |filename|. Returns

+  // true on success.

+  bool Open(const char* filename);

+  // Closes an opened file.

+  void Close();

+ private:

+  // File handle to output file.

+  FILE* file_;

+  bool writer_owns_file_;

+  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(MkvWriter);

+};

+}  // namespace mkvmuxer

+#endif  // MKVMUXER_MKVWRITER_H_

--- a/third_party/libwebm/mkvmuxertypes.hpp

+++ /dev/null

@@ -1,30 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVMUXERTYPES_HPP

-#define MKVMUXERTYPES_HPP

-// Copied from Chromium basictypes.h

-// A macro to disallow the copy constructor and operator= functions

-// This should be used in the private: declarations for a class

-#define LIBWEBM_DISALLOW_COPY_AND_ASSIGN(TypeName) \

-  TypeName(const TypeName&);                       \

-  void operator=(const TypeName&)

-namespace mkvmuxer {

-typedef unsigned char uint8;

-typedef short int16;

-typedef int int32;

-typedef unsigned int uint32;

-typedef long long int64;

-typedef unsigned long long uint64;

-}  // end namespace mkvmuxer

-#endif  // MKVMUXERTYPES_HPP

--- a/third_party/libwebm/mkvmuxerutil.cpp

+++ /dev/null

@@ -1,629 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#include "mkvmuxerutil.hpp"

-#ifdef __ANDROID__

-#include <fcntl.h>

-#endif

-#include <cassert>

-#include <cmath>

-#include <cstdio>

-#include <cstdlib>

-#include <cstring>

-#include <ctime>

-#include <new>

-#include "mkvwriter.hpp"

-#include "webmids.hpp"

-#ifdef _MSC_VER

-// Disable MSVC warnings that suggest making code non-portable.

-#pragma warning(disable : 4996)

-#endif

-namespace mkvmuxer {

-namespace {

-// Date elements are always 8 octets in size.

-const int kDateElementSize = 8;

-uint64 WriteBlock(IMkvWriter* writer, const Frame* const frame, int64 timecode,

-                  uint64 timecode_scale) {

-  uint64 block_additional_elem_size = 0;

-  uint64 block_addid_elem_size = 0;

-  uint64 block_more_payload_size = 0;

-  uint64 block_more_elem_size = 0;

-  uint64 block_additions_payload_size = 0;

-  uint64 block_additions_elem_size = 0;

-  if (frame->additional()) {

-    block_additional_elem_size = EbmlElementSize(

-        kMkvBlockAdditional, frame->additional(), frame->additional_length());

-    block_addid_elem_size = EbmlElementSize(kMkvBlockAddID, frame->add_id());

-    block_more_payload_size =

-        block_addid_elem_size + block_additional_elem_size;

-    block_more_elem_size =

-        EbmlMasterElementSize(kMkvBlockMore, block_more_payload_size) +

-        block_more_payload_size;

-    block_additions_payload_size = block_more_elem_size;

-    block_additions_elem_size =

-        EbmlMasterElementSize(kMkvBlockAdditions,

-                              block_additions_payload_size) +

-        block_additions_payload_size;

-  }

-  uint64 discard_padding_elem_size = 0;

-  if (frame->discard_padding() != 0) {

-    discard_padding_elem_size =

-        EbmlElementSize(kMkvDiscardPadding, frame->discard_padding());

-  }

-  const uint64 reference_block_timestamp =

-      frame->reference_block_timestamp() / timecode_scale;

-  uint64 reference_block_elem_size = 0;

-  if (!frame->is_key()) {

-    reference_block_elem_size =

-        EbmlElementSize(kMkvReferenceBlock, reference_block_timestamp);

-  }

-  const uint64 duration = frame->duration() / timecode_scale;

-  uint64 block_duration_elem_size = 0;

-  if (duration > 0)

-    block_duration_elem_size = EbmlElementSize(kMkvBlockDuration, duration);

-  const uint64 block_payload_size = 4 + frame->length();

-  const uint64 block_elem_size =

-      EbmlMasterElementSize(kMkvBlock, block_payload_size) + block_payload_size;

-  const uint64 block_group_payload_size =

-      block_elem_size + block_additions_elem_size + block_duration_elem_size +

-      discard_padding_elem_size + reference_block_elem_size;

-  if (!WriteEbmlMasterElement(writer, kMkvBlockGroup,

-                              block_group_payload_size)) {

-    return 0;

-  }

-  if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size))

-    return 0;

-  if (WriteUInt(writer, frame->track_number()))

-    return 0;

-  if (SerializeInt(writer, timecode, 2))

-    return 0;

-  // For a Block, flags is always 0.

-  if (SerializeInt(writer, 0, 1))

-    return 0;

-  if (writer->Write(frame->frame(), static_cast<uint32>(frame->length())))

-    return 0;

-  if (frame->additional()) {

-    if (!WriteEbmlMasterElement(writer, kMkvBlockAdditions,

-                                block_additions_payload_size)) {

-      return 0;

-    }

-    if (!WriteEbmlMasterElement(writer, kMkvBlockMore, block_more_payload_size))

-      return 0;

-    if (!WriteEbmlElement(writer, kMkvBlockAddID, frame->add_id()))

-      return 0;

-    if (!WriteEbmlElement(writer, kMkvBlockAdditional, frame->additional(),

-                          frame->additional_length())) {

-      return 0;

-    }

-  }

-  if (frame->discard_padding() != 0 &&

-      !WriteEbmlElement(writer, kMkvDiscardPadding, frame->discard_padding())) {

-    return false;

-  }

-  if (!frame->is_key() &&

-      !WriteEbmlElement(writer, kMkvReferenceBlock,

-                        reference_block_timestamp)) {

-    return false;

-  }

-  if (duration > 0 && !WriteEbmlElement(writer, kMkvBlockDuration, duration)) {

-    return false;

-  }

-  return EbmlMasterElementSize(kMkvBlockGroup, block_group_payload_size) +

-         block_group_payload_size;

-}

-uint64 WriteSimpleBlock(IMkvWriter* writer, const Frame* const frame,

-                        int64 timecode) {

-  if (WriteID(writer, kMkvSimpleBlock))

-    return 0;

-  const int32 size = static_cast<int32>(frame->length()) + 4;

-  if (WriteUInt(writer, size))

-    return 0;

-  if (WriteUInt(writer, static_cast<uint64>(frame->track_number())))

-    return 0;

-  if (SerializeInt(writer, timecode, 2))

-    return 0;

-  uint64 flags = 0;

-  if (frame->is_key())

-    flags |= 0x80;

-  if (SerializeInt(writer, flags, 1))

-    return 0;

-  if (writer->Write(frame->frame(), static_cast<uint32>(frame->length())))

-    return 0;

-  return GetUIntSize(kMkvSimpleBlock) + GetCodedUIntSize(size) + 4 +

-         frame->length();

-}

-}  // namespace

-int32 GetCodedUIntSize(uint64 value) {

-  if (value < 0x000000000000007FULL)

-    return 1;

-  else if (value < 0x0000000000003FFFULL)

-    return 2;

-  else if (value < 0x00000000001FFFFFULL)

-    return 3;

-  else if (value < 0x000000000FFFFFFFULL)

-    return 4;

-  else if (value < 0x00000007FFFFFFFFULL)

-    return 5;

-  else if (value < 0x000003FFFFFFFFFFULL)

-    return 6;

-  else if (value < 0x0001FFFFFFFFFFFFULL)

-    return 7;

-  return 8;

-}

-int32 GetUIntSize(uint64 value) {

-  if (value < 0x0000000000000100ULL)

-    return 1;

-  else if (value < 0x0000000000010000ULL)

-    return 2;

-  else if (value < 0x0000000001000000ULL)

-    return 3;

-  else if (value < 0x0000000100000000ULL)

-    return 4;

-  else if (value < 0x0000010000000000ULL)

-    return 5;

-  else if (value < 0x0001000000000000ULL)

-    return 6;

-  else if (value < 0x0100000000000000ULL)

-    return 7;

-  return 8;

-}

-int32 GetIntSize(int64 value) {

-  // Doubling the requested value ensures positive values with their high bit

-  // set are written with 0-padding to avoid flipping the signedness.

-  const uint64 v = (value < 0) ? value ^ -1LL : value;

-  return GetUIntSize(2 * v);

-}

-uint64 EbmlMasterElementSize(uint64 type, uint64 value) {

-  // Size of EBML ID

-  int32 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += GetCodedUIntSize(value);

-  return ebml_size;

-}

-uint64 EbmlElementSize(uint64 type, int64 value) {

-  // Size of EBML ID

-  int32 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += GetIntSize(value);

-  // Size of Datasize

-  ebml_size++;

-  return ebml_size;

-}

-uint64 EbmlElementSize(uint64 type, uint64 value) {

-  // Size of EBML ID

-  int32 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += GetUIntSize(value);

-  // Size of Datasize

-  ebml_size++;

-  return ebml_size;

-}

-uint64 EbmlElementSize(uint64 type, float /* value */) {

-  // Size of EBML ID

-  uint64 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += sizeof(float);

-  // Size of Datasize

-  ebml_size++;

-  return ebml_size;

-}

-uint64 EbmlElementSize(uint64 type, const char* value) {

-  if (!value)

-    return 0;

-  // Size of EBML ID

-  uint64 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += strlen(value);

-  // Size of Datasize

-  ebml_size++;

-  return ebml_size;

-}

-uint64 EbmlElementSize(uint64 type, const uint8* value, uint64 size) {

-  if (!value)

-    return 0;

-  // Size of EBML ID

-  uint64 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += size;

-  // Size of Datasize

-  ebml_size += GetCodedUIntSize(size);

-  return ebml_size;

-}

-uint64 EbmlDateElementSize(uint64 type) {

-  // Size of EBML ID

-  uint64 ebml_size = GetUIntSize(type);

-  // Datasize

-  ebml_size += kDateElementSize;

-  // Size of Datasize

-  ebml_size++;

-  return ebml_size;

-}

-int32 SerializeInt(IMkvWriter* writer, int64 value, int32 size) {

-  if (!writer || size < 1 || size > 8)

-    return -1;

-  for (int32 i = 1; i <= size; ++i) {

-    const int32 byte_count = size - i;

-    const int32 bit_count = byte_count * 8;

-    const int64 bb = value >> bit_count;

-    const uint8 b = static_cast<uint8>(bb);

-    const int32 status = writer->Write(&b, 1);

-    if (status < 0)

-      return status;

-  }

-  return 0;

-}

-int32 SerializeFloat(IMkvWriter* writer, float f) {

-  if (!writer)

-    return -1;

-  assert(sizeof(uint32) == sizeof(float));

-  // This union is merely used to avoid a reinterpret_cast from float& to

-  // uint32& which will result in violation of strict aliasing.

-  union U32 {

-    uint32 u32;

-    float f;

-  } value;

-  value.f = f;

-  for (int32 i = 1; i <= 4; ++i) {

-    const int32 byte_count = 4 - i;

-    const int32 bit_count = byte_count * 8;

-    const uint8 byte = static_cast<uint8>(value.u32 >> bit_count);

-    const int32 status = writer->Write(&byte, 1);

-    if (status < 0)

-      return status;

-  }

-  return 0;

-}

-int32 WriteUInt(IMkvWriter* writer, uint64 value) {

-  if (!writer)

-    return -1;

-  int32 size = GetCodedUIntSize(value);

-  return WriteUIntSize(writer, value, size);

-}

-int32 WriteUIntSize(IMkvWriter* writer, uint64 value, int32 size) {

-  if (!writer || size < 0 || size > 8)

-    return -1;

-  if (size > 0) {

-    const uint64 bit = 1LL << (size * 7);

-    if (value > (bit - 2))

-      return -1;

-    value |= bit;

-  } else {

-    size = 1;

-    int64 bit;

-    for (;;) {

-      bit = 1LL << (size * 7);

-      const uint64 max = bit - 2;

-      if (value <= max)

-        break;

-      ++size;

-    }

-    if (size > 8)

-      return false;

-    value |= bit;

-  }

-  return SerializeInt(writer, value, size);

-}

-int32 WriteID(IMkvWriter* writer, uint64 type) {

-  if (!writer)

-    return -1;

-  writer->ElementStartNotify(type, writer->Position());

-  const int32 size = GetUIntSize(type);

-  return SerializeInt(writer, type, size);

-}

-bool WriteEbmlMasterElement(IMkvWriter* writer, uint64 type, uint64 size) {

-  if (!writer)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  if (WriteUInt(writer, size))

-    return false;

-  return true;

-}

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, uint64 value) {

-  if (!writer)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  const uint64 size = GetUIntSize(value);

-  if (WriteUInt(writer, size))

-    return false;

-  if (SerializeInt(writer, value, static_cast<int32>(size)))

-    return false;

-  return true;

-}

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, int64 value) {

-  if (!writer)

-    return false;

-  if (WriteID(writer, type))

-    return 0;

-  const uint64 size = GetIntSize(value);

-  if (WriteUInt(writer, size))

-    return false;

-  if (SerializeInt(writer, value, static_cast<int32>(size)))

-    return false;

-  return true;

-}

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, float value) {

-  if (!writer)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  if (WriteUInt(writer, 4))

-    return false;

-  if (SerializeFloat(writer, value))

-    return false;

-  return true;

-}

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, const char* value) {

-  if (!writer || !value)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  const uint64 length = strlen(value);

-  if (WriteUInt(writer, length))

-    return false;

-  if (writer->Write(value, static_cast<const uint32>(length)))

-    return false;

-  return true;

-}

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, const uint8* value,

-                      uint64 size) {

-  if (!writer || !value || size < 1)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  if (WriteUInt(writer, size))

-    return false;

-  if (writer->Write(value, static_cast<uint32>(size)))

-    return false;

-  return true;

-}

-bool WriteEbmlDateElement(IMkvWriter* writer, uint64 type, int64 value) {

-  if (!writer)

-    return false;

-  if (WriteID(writer, type))

-    return false;

-  if (WriteUInt(writer, kDateElementSize))

-    return false;

-  if (SerializeInt(writer, value, kDateElementSize))

-    return false;

-  return true;

-}

-uint64 WriteFrame(IMkvWriter* writer, const Frame* const frame,

-                  Cluster* cluster) {

-  if (!writer || !frame || !frame->IsValid() || !cluster ||

-      !cluster->timecode_scale())

-    return 0;

-  //  Technically the timecode for a block can be less than the

-  //  timecode for the cluster itself (remember that block timecode

-  //  is a signed, 16-bit integer).  However, as a simplification we

-  //  only permit non-negative cluster-relative timecodes for blocks.

-  const int64 relative_timecode = cluster->GetRelativeTimecode(

-      frame->timestamp() / cluster->timecode_scale());

-  if (relative_timecode < 0 || relative_timecode > kMaxBlockTimecode)

-    return 0;

-  return frame->CanBeSimpleBlock() ?

-             WriteSimpleBlock(writer, frame, relative_timecode) :

-             WriteBlock(writer, frame, relative_timecode,

-                        cluster->timecode_scale());

-}

-uint64 WriteVoidElement(IMkvWriter* writer, uint64 size) {

-  if (!writer)

-    return false;

-  // Subtract one for the void ID and the coded size.

-  uint64 void_entry_size = size - 1 - GetCodedUIntSize(size - 1);

-  uint64 void_size =

-      EbmlMasterElementSize(kMkvVoid, void_entry_size) + void_entry_size;

-  if (void_size != size)

-    return 0;

-  const int64 payload_position = writer->Position();

-  if (payload_position < 0)

-    return 0;

-  if (WriteID(writer, kMkvVoid))

-    return 0;

-  if (WriteUInt(writer, void_entry_size))

-    return 0;

-  const uint8 value = 0;

-  for (int32 i = 0; i < static_cast<int32>(void_entry_size); ++i) {

-    if (writer->Write(&value, 1))

-      return 0;

-  }

-  const int64 stop_position = writer->Position();

-  if (stop_position < 0 ||

-      stop_position - payload_position != static_cast<int64>(void_size))

-    return 0;

-  return void_size;

-}

-void GetVersion(int32* major, int32* minor, int32* build, int32* revision) {

-  *major = 0;

-  *minor = 2;

-  *build = 1;

-  *revision = 0;

-}

-}  // namespace mkvmuxer

-mkvmuxer::uint64 mkvmuxer::MakeUID(unsigned int* seed) {

-  uint64 uid = 0;

-#ifdef __MINGW32__

-  srand(*seed);

-#endif

-  for (int i = 0; i < 7; ++i) {  // avoid problems with 8-byte values

-    uid <<= 8;

-// TODO(fgalligan): Move random number generation to platform specific code.

-#ifdef _MSC_VER

-    (void)seed;

-    const int32 nn = rand();

-#elif __ANDROID__

-    int32 temp_num = 1;

-    int fd = open("/dev/urandom", O_RDONLY);

-    if (fd != -1) {

-      read(fd, &temp_num, sizeof(int32));

-      close(fd);

-    }

-    const int32 nn = temp_num;

-#elif defined __MINGW32__

-    const int32 nn = rand();

-#else

-    const int32 nn = rand_r(seed);

-#endif

-    const int32 n = 0xFF & (nn >> 4);  // throw away low-order bits

-    uid |= n;

-  }

-  return uid;

-}

--- a/third_party/libwebm/mkvmuxerutil.hpp

+++ /dev/null

@@ -1,83 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVMUXERUTIL_HPP

-#define MKVMUXERUTIL_HPP

-#include "mkvmuxer.hpp"

-#include "mkvmuxertypes.hpp"

-namespace mkvmuxer {

-class IMkvWriter;

-const uint64 kEbmlUnknownValue = 0x01FFFFFFFFFFFFFFULL;

-const int64 kMaxBlockTimecode = 0x07FFFLL;

-// Writes out |value| in Big Endian order. Returns 0 on success.

-int32 SerializeInt(IMkvWriter* writer, int64 value, int32 size);

-// Returns the size in bytes of the element.

-int32 GetUIntSize(uint64 value);

-int32 GetIntSize(int64 value);

-int32 GetCodedUIntSize(uint64 value);

-uint64 EbmlMasterElementSize(uint64 type, uint64 value);

-uint64 EbmlElementSize(uint64 type, int64 value);

-uint64 EbmlElementSize(uint64 type, uint64 value);

-uint64 EbmlElementSize(uint64 type, float value);

-uint64 EbmlElementSize(uint64 type, const char* value);

-uint64 EbmlElementSize(uint64 type, const uint8* value, uint64 size);

-uint64 EbmlDateElementSize(uint64 type);

-// Creates an EBML coded number from |value| and writes it out. The size of

-// the coded number is determined by the value of |value|. |value| must not

-// be in a coded form. Returns 0 on success.

-int32 WriteUInt(IMkvWriter* writer, uint64 value);

-// Creates an EBML coded number from |value| and writes it out. The size of

-// the coded number is determined by the value of |size|. |value| must not

-// be in a coded form. Returns 0 on success.

-int32 WriteUIntSize(IMkvWriter* writer, uint64 value, int32 size);

-// Output an Mkv master element. Returns true if the element was written.

-bool WriteEbmlMasterElement(IMkvWriter* writer, uint64 value, uint64 size);

-// Outputs an Mkv ID, calls |IMkvWriter::ElementStartNotify|, and passes the

-// ID to |SerializeInt|. Returns 0 on success.

-int32 WriteID(IMkvWriter* writer, uint64 type);

-// Output an Mkv non-master element. Returns true if the element was written.

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, uint64 value);

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, int64 value);

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, float value);

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, const char* value);

-bool WriteEbmlElement(IMkvWriter* writer, uint64 type, const uint8* value,

-                      uint64 size);

-bool WriteEbmlDateElement(IMkvWriter* writer, uint64 type, int64 value);

-// Output a Mkv Frame. It decides the correct element to write (Block vs

-// SimpleBlock) based on the parameters of the Frame.

-uint64 WriteFrame(IMkvWriter* writer, const Frame* const frame,

-                  Cluster* cluster);

-// Output a void element. |size| must be the entire size in bytes that will be

-// void. The function will calculate the size of the void header and subtract

-// it from |size|.

-uint64 WriteVoidElement(IMkvWriter* writer, uint64 size);

-// Returns the version number of the muxer in |major|, |minor|, |build|,

-// and |revision|.

-void GetVersion(int32* major, int32* minor, int32* build, int32* revision);

-// Returns a random number to be used for UID, using |seed| to seed

-// the random-number generator (see POSIX rand_r() for semantics).

-uint64 MakeUID(unsigned int* seed);

-}  // end namespace mkvmuxer

-#endif  // MKVMUXERUTIL_HPP

--- a/third_party/libwebm/mkvparser.cpp

+++ /dev/null

@@ -1,7724 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#include "mkvparser.hpp"

-#if defined(_MSC_VER) && _MSC_VER < 1800

-#include <float.h>  // _isnan() / _finite()

-#define MSC_COMPAT

-#endif

-#include <cassert>

-#include <climits>

-#include <cmath>

-#include <cstring>

-#include <new>

-#include "webmids.hpp"

-#ifdef _MSC_VER

-// Disable MSVC warnings that suggest making code non-portable.

-#pragma warning(disable : 4996)

-#endif

-namespace mkvparser {

-#ifdef MSC_COMPAT

-inline bool isnan(double val) { return !!_isnan(val); }

-inline bool isinf(double val) { return !_finite(val); }

-#else

-inline bool isnan(double val) { return std::isnan(val); }

-inline bool isinf(double val) { return std::isinf(val); }

-#endif  // MSC_COMPAT

-IMkvReader::~IMkvReader() {}

-template<typename Type> Type* SafeArrayAlloc(unsigned long long num_elements,

-                                             unsigned long long element_size) {

-  if (num_elements == 0 || element_size == 0)

-    return NULL;

-  const size_t kMaxAllocSize = 0x80000000;  // 2GiB

-  const unsigned long long num_bytes = num_elements * element_size;

-  if (element_size > (kMaxAllocSize / num_elements))

-    return NULL;

-  if (num_bytes != static_cast<size_t>(num_bytes))

-    return NULL;

-  return new (std::nothrow) Type[static_cast<size_t>(num_bytes)];

-}

-void GetVersion(int& major, int& minor, int& build, int& revision) {

-  major = 1;

-  minor = 0;

-  build = 0;

-  revision = 30;

-}

-long long ReadUInt(IMkvReader* pReader, long long pos, long& len) {

-  if (!pReader || pos < 0)

-    return E_FILE_FORMAT_INVALID;

-  len = 1;

-  unsigned char b;

-  int status = pReader->Read(pos, 1, &b);

-  if (status < 0)  // error or underflow

-    return status;

-  if (status > 0)  // interpreted as "underflow"

-    return E_BUFFER_NOT_FULL;

-  if (b == 0)  // we can't handle u-int values larger than 8 bytes

-    return E_FILE_FORMAT_INVALID;

-  unsigned char m = 0x80;

-  while (!(b & m)) {

-    m >>= 1;

-    ++len;

-  }

-  long long result = b & (~m);

-  ++pos;

-  for (int i = 1; i < len; ++i) {

-    status = pReader->Read(pos, 1, &b);

-    if (status < 0) {

-      len = 1;

-      return status;

-    }

-    if (status > 0) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result <<= 8;

-    result |= b;

-    ++pos;

-  }

-  return result;

-}

-// Reads an EBML ID and returns it.

-// An ID must at least 1 byte long, cannot exceed 4, and its value must be

-// greater than 0.

-// See known EBML values and EBMLMaxIDLength:

-// http://www.matroska.org/technical/specs/index.html

-// Returns the ID, or a value less than 0 to report an error while reading the

-// ID.

-long long ReadID(IMkvReader* pReader, long long pos, long& len) {

-  if (pReader == NULL || pos < 0)

-    return E_FILE_FORMAT_INVALID;

-  // Read the first byte. The length in bytes of the ID is determined by

-  // finding the first set bit in the first byte of the ID.

-  unsigned char temp_byte = 0;

-  int read_status = pReader->Read(pos, 1, &temp_byte);

-  if (read_status < 0)

-    return E_FILE_FORMAT_INVALID;

-  else if (read_status > 0)  // No data to read.

-    return E_BUFFER_NOT_FULL;

-  if (temp_byte == 0)  // ID length > 8 bytes; invalid file.

-    return E_FILE_FORMAT_INVALID;

-  int bit_pos = 0;

-  const int kMaxIdLengthInBytes = 4;

-  const int kCheckByte = 0x80;

-  // Find the first bit that's set.

-  bool found_bit = false;

-  for (; bit_pos < kMaxIdLengthInBytes; ++bit_pos) {

-    if ((kCheckByte >> bit_pos) & temp_byte) {

-      found_bit = true;

-      break;

-    }

-  }

-  if (!found_bit) {

-    // The value is too large to be a valid ID.

-    return E_FILE_FORMAT_INVALID;

-  }

-  // Read the remaining bytes of the ID (if any).

-  const int id_length = bit_pos + 1;

-  long long ebml_id = temp_byte;

-  for (int i = 1; i < id_length; ++i) {

-    ebml_id <<= 8;

-    read_status = pReader->Read(pos + i, 1, &temp_byte);

-    if (read_status < 0)

-      return E_FILE_FORMAT_INVALID;

-    else if (read_status > 0)

-      return E_BUFFER_NOT_FULL;

-    ebml_id |= temp_byte;

-  }

-  len = id_length;

-  return ebml_id;

-}

-long long GetUIntLength(IMkvReader* pReader, long long pos, long& len) {

-  if (!pReader || pos < 0)

-    return E_FILE_FORMAT_INVALID;

-  long long total, available;

-  int status = pReader->Length(&total, &available);

-  if (status < 0 || (total >= 0 && available > total))

-    return E_FILE_FORMAT_INVALID;

-  len = 1;

-  if (pos >= available)

-    return pos;  // too few bytes available

-  unsigned char b;

-  status = pReader->Read(pos, 1, &b);

-  if (status != 0)

-    return status;

-  if (b == 0)  // we can't handle u-int values larger than 8 bytes

-    return E_FILE_FORMAT_INVALID;

-  unsigned char m = 0x80;

-  while (!(b & m)) {

-    m >>= 1;

-    ++len;

-  }

-  return 0;  // success

-}

-// TODO(vigneshv): This function assumes that unsigned values never have their

-// high bit set.

-long long UnserializeUInt(IMkvReader* pReader, long long pos, long long size) {

-  if (!pReader || pos < 0 || (size <= 0) || (size > 8))

-    return E_FILE_FORMAT_INVALID;

-  long long result = 0;

-  for (long long i = 0; i < size; ++i) {

-    unsigned char b;

-    const long status = pReader->Read(pos, 1, &b);

-    if (status < 0)

-      return status;

-    result <<= 8;

-    result |= b;

-    ++pos;

-  }

-  return result;

-}

-long UnserializeFloat(IMkvReader* pReader, long long pos, long long size_,

-                      double& result) {

-  if (!pReader || pos < 0 || ((size_ != 4) && (size_ != 8)))

-    return E_FILE_FORMAT_INVALID;

-  const long size = static_cast<long>(size_);

-  unsigned char buf[8];

-  const int status = pReader->Read(pos, size, buf);

-  if (status < 0)  // error

-    return status;

-  if (size == 4) {

-    union {

-      float f;

-      unsigned long ff;

-    };

-    ff = 0;

-    for (int i = 0;;) {

-      ff |= buf[i];

-      if (++i >= 4)

-        break;

-      ff <<= 8;

-    }

-    result = f;

-  } else {

-    union {

-      double d;

-      unsigned long long dd;

-    };

-    dd = 0;

-    for (int i = 0;;) {

-      dd |= buf[i];

-      if (++i >= 8)

-        break;

-      dd <<= 8;

-    }

-    result = d;

-  }

-  if (mkvparser::isinf(result) || mkvparser::isnan(result))

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long UnserializeInt(IMkvReader* pReader, long long pos, long long size,

-                    long long& result_ref) {

-  if (!pReader || pos < 0 || size < 1 || size > 8)

-    return E_FILE_FORMAT_INVALID;

-  signed char first_byte = 0;

-  const long status = pReader->Read(pos, 1, (unsigned char*)&first_byte);

-  if (status < 0)

-    return status;

-  unsigned long long result = first_byte;

-  ++pos;

-  for (long i = 1; i < size; ++i) {

-    unsigned char b;

-    const long status = pReader->Read(pos, 1, &b);

-    if (status < 0)

-      return status;

-    result <<= 8;

-    result |= b;

-    ++pos;

-  }

-  result_ref = static_cast<long long>(result);

-  return 0;

-}

-long UnserializeString(IMkvReader* pReader, long long pos, long long size,

-                       char*& str) {

-  delete[] str;

-  str = NULL;

-  if (size >= LONG_MAX || size < 0)

-    return E_FILE_FORMAT_INVALID;

-  // +1 for '\0' terminator

-  const long required_size = static_cast<long>(size) + 1;

-  str = SafeArrayAlloc<char>(1, required_size);

-  if (str == NULL)

-    return E_FILE_FORMAT_INVALID;

-  unsigned char* const buf = reinterpret_cast<unsigned char*>(str);

-  const long status = pReader->Read(pos, static_cast<long>(size), buf);

-  if (status) {

-    delete[] str;

-    str = NULL;

-    return status;

-  }

-  str[required_size - 1] = '\0';

-  return 0;

-}

-long ParseElementHeader(IMkvReader* pReader, long long& pos,

-                        long long stop, long long& id,

-                        long long& size) {

-  if (stop >= 0 && pos >= stop)

-    return E_FILE_FORMAT_INVALID;

-  long len;

-  id = ReadID(pReader, pos, len);

-  if (id < 0)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume id

-  if (stop >= 0 && pos >= stop)

-    return E_FILE_FORMAT_INVALID;

-  size = ReadUInt(pReader, pos, len);

-  if (size < 0 || len < 1 || len > 8) {

-    // Invalid: Negative payload size, negative or 0 length integer, or integer

-    // larger than 64 bits (libwebm cannot handle them).

-    return E_FILE_FORMAT_INVALID;

-  }

-  // Avoid rolling over pos when very close to LLONG_MAX.

-  const unsigned long long rollover_check =

-      static_cast<unsigned long long>(pos) + len;

-  if (rollover_check > LLONG_MAX)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume length of size

-  // pos now designates payload

-  if (stop >= 0 && pos >= stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;  // success

-}

-bool Match(IMkvReader* pReader, long long& pos, unsigned long expected_id,

-           long long& val) {

-  if (!pReader || pos < 0)

-    return false;

-  long long total = 0;

-  long long available = 0;

-  const long status = pReader->Length(&total, &available);

-  if (status < 0 || (total >= 0 && available > total))

-    return false;

-  long len = 0;

-  const long long id = ReadID(pReader, pos, len);

-  if (id < 0 || (available - pos) > len)

-    return false;

-  if (static_cast<unsigned long>(id) != expected_id)

-    return false;

-  pos += len;  // consume id

-  const long long size = ReadUInt(pReader, pos, len);

-  if (size < 0 || size > 8 || len < 1 || len > 8 || (available - pos) > len)

-    return false;

-  pos += len;  // consume length of size of payload

-  val = UnserializeUInt(pReader, pos, size);

-  if (val < 0)

-    return false;

-  pos += size;  // consume size of payload

-  return true;

-}

-bool Match(IMkvReader* pReader, long long& pos, unsigned long expected_id,

-           unsigned char*& buf, size_t& buflen) {

-  if (!pReader || pos < 0)

-    return false;

-  long long total = 0;

-  long long available = 0;

-  long status = pReader->Length(&total, &available);

-  if (status < 0 || (total >= 0 && available > total))

-    return false;

-  long len = 0;

-  const long long id = ReadID(pReader, pos, len);

-  if (id < 0 || (available - pos) > len)

-    return false;

-  if (static_cast<unsigned long>(id) != expected_id)

-    return false;

-  pos += len;  // consume id

-  const long long size = ReadUInt(pReader, pos, len);

-  if (size < 0 || len <= 0 || len > 8 || (available - pos) > len)

-    return false;

-  unsigned long long rollover_check =

-      static_cast<unsigned long long>(pos) + len;

-  if (rollover_check > LLONG_MAX)

-    return false;

-  pos += len;  // consume length of size of payload

-  rollover_check = static_cast<unsigned long long>(pos) + size;

-  if (rollover_check > LLONG_MAX)

-    return false;

-  if ((pos + size) > available)

-    return false;

-  if (size >= LONG_MAX)

-    return false;

-  const long buflen_ = static_cast<long>(size);

-  buf = SafeArrayAlloc<unsigned char>(1, buflen_);

-  if (!buf)

-    return false;

-  status = pReader->Read(pos, buflen_, buf);

-  if (status != 0)

-    return false;

-  buflen = buflen_;

-  pos += size;  // consume size of payload

-  return true;

-}

-EBMLHeader::EBMLHeader() : m_docType(NULL) { Init(); }

-EBMLHeader::~EBMLHeader() { delete[] m_docType; }

-void EBMLHeader::Init() {

-  m_version = 1;

-  m_readVersion = 1;

-  m_maxIdLength = 4;

-  m_maxSizeLength = 8;

-  if (m_docType) {

-    delete[] m_docType;

-    m_docType = NULL;

-  }

-  m_docTypeVersion = 1;

-  m_docTypeReadVersion = 1;

-}

-long long EBMLHeader::Parse(IMkvReader* pReader, long long& pos) {

-  if (!pReader)

-    return E_FILE_FORMAT_INVALID;

-  long long total, available;

-  long status = pReader->Length(&total, &available);

-  if (status < 0)  // error

-    return status;

-  pos = 0;

-  long long end = (available >= 1024) ? 1024 : available;

-  // Scan until we find what looks like the first byte of the EBML header.

-  const long long kMaxScanBytes = (available >= 1024) ? 1024 : available;

-  const unsigned char kEbmlByte0 = 0x1A;

-  unsigned char scan_byte = 0;

-  while (pos < kMaxScanBytes) {

-    status = pReader->Read(pos, 1, &scan_byte);

-    if (status < 0)  // error

-      return status;

-    else if (status > 0)

-      return E_BUFFER_NOT_FULL;

-    if (scan_byte == kEbmlByte0)

-      break;

-    ++pos;

-  }

-  long len = 0;

-  const long long ebml_id = ReadID(pReader, pos, len);

-  // TODO(tomfinegan): Move Matroska ID constants into a common namespace.

-  if (len != 4 || ebml_id != mkvmuxer::kMkvEBML)

-    return E_FILE_FORMAT_INVALID;

-  // Move read pos forward to the EBML header size field.

-  pos += 4;

-  // Read length of size field.

-  long long result = GetUIntLength(pReader, pos, len);

-  if (result < 0)  // error

-    return E_FILE_FORMAT_INVALID;

-  else if (result > 0)  // need more data

-    return E_BUFFER_NOT_FULL;

-  if (len < 1 || len > 8)

-    return E_FILE_FORMAT_INVALID;

-  if ((total >= 0) && ((total - pos) < len))

-    return E_FILE_FORMAT_INVALID;

-  if ((available - pos) < len)

-    return pos + len;  // try again later

-  // Read the EBML header size.

-  result = ReadUInt(pReader, pos, len);

-  if (result < 0)  // error

-    return result;

-  pos += len;  // consume size field

-  // pos now designates start of payload

-  if ((total >= 0) && ((total - pos) < result))

-    return E_FILE_FORMAT_INVALID;

-  if ((available - pos) < result)

-    return pos + result;

-  end = pos + result;

-  Init();

-  while (pos < end) {

-    long long id, size;

-    status = ParseElementHeader(pReader, pos, end, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)

-      return E_FILE_FORMAT_INVALID;

-    if (id == mkvmuxer::kMkvEBMLVersion) {

-      m_version = UnserializeUInt(pReader, pos, size);

-      if (m_version <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvEBMLReadVersion) {

-      m_readVersion = UnserializeUInt(pReader, pos, size);

-      if (m_readVersion <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvEBMLMaxIDLength) {

-      m_maxIdLength = UnserializeUInt(pReader, pos, size);

-      if (m_maxIdLength <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvEBMLMaxSizeLength) {

-      m_maxSizeLength = UnserializeUInt(pReader, pos, size);

-      if (m_maxSizeLength <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDocType) {

-      if (m_docType)

-        return E_FILE_FORMAT_INVALID;

-      status = UnserializeString(pReader, pos, size, m_docType);

-      if (status)  // error

-        return status;

-    } else if (id == mkvmuxer::kMkvDocTypeVersion) {

-      m_docTypeVersion = UnserializeUInt(pReader, pos, size);

-      if (m_docTypeVersion <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDocTypeReadVersion) {

-      m_docTypeReadVersion = UnserializeUInt(pReader, pos, size);

-      if (m_docTypeReadVersion <= 0)

-        return E_FILE_FORMAT_INVALID;

-    }

-    pos += size;

-  }

-  if (pos != end)

-    return E_FILE_FORMAT_INVALID;

-  // Make sure DocType, DocTypeReadVersion, and DocTypeVersion are valid.

-  if (m_docType == NULL || m_docTypeReadVersion <= 0 || m_docTypeVersion <= 0)

-    return E_FILE_FORMAT_INVALID;

-  // Make sure EBMLMaxIDLength and EBMLMaxSizeLength are valid.

-  if (m_maxIdLength <= 0 || m_maxIdLength > 4 ||

-      m_maxSizeLength <= 0 || m_maxSizeLength > 8)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-Segment::Segment(IMkvReader* pReader, long long elem_start,

-                 // long long elem_size,

-                 long long start, long long size)

-    : m_pReader(pReader),

-      m_element_start(elem_start),

-      // m_element_size(elem_size),

-      m_start(start),

-      m_size(size),

-      m_pos(start),

-      m_pUnknownSize(0),

-      m_pSeekHead(NULL),

-      m_pInfo(NULL),

-      m_pTracks(NULL),

-      m_pCues(NULL),

-      m_pChapters(NULL),

-      m_pTags(NULL),

-      m_clusters(NULL),

-      m_clusterCount(0),

-      m_clusterPreloadCount(0),

-      m_clusterSize(0) {}

-Segment::~Segment() {

-  const long count = m_clusterCount + m_clusterPreloadCount;

-  Cluster** i = m_clusters;

-  Cluster** j = m_clusters + count;

-  while (i != j) {

-    Cluster* const p = *i++;

-    delete p;

-  }

-  delete[] m_clusters;

-  delete m_pTracks;

-  delete m_pInfo;

-  delete m_pCues;

-  delete m_pChapters;

-  delete m_pTags;

-  delete m_pSeekHead;

-}

-long long Segment::CreateInstance(IMkvReader* pReader, long long pos,

-                                  Segment*& pSegment) {

-  if (pReader == NULL || pos < 0)

-    return E_PARSE_FAILED;

-  pSegment = NULL;

-  long long total, available;

-  const long status = pReader->Length(&total, &available);

-  if (status < 0)  // error

-    return status;

-  if (available < 0)

-    return -1;

-  if ((total >= 0) && (available > total))

-    return -1;

-  // I would assume that in practice this loop would execute

-  // exactly once, but we allow for other elements (e.g. Void)

-  // to immediately follow the EBML header.  This is fine for

-  // the source filter case (since the entire file is available),

-  // but in the splitter case over a network we should probably

-  // just give up early.  We could for example decide only to

-  // execute this loop a maximum of, say, 10 times.

-  // TODO:

-  // There is an implied "give up early" by only parsing up

-  // to the available limit.  We do do that, but only if the

-  // total file size is unknown.  We could decide to always

-  // use what's available as our limit (irrespective of whether

-  // we happen to know the total file length).  This would have

-  // as its sense "parse this much of the file before giving up",

-  // which a slightly different sense from "try to parse up to

-  // 10 EMBL elements before giving up".

-  for (;;) {

-    if ((total >= 0) && (pos >= total))

-      return E_FILE_FORMAT_INVALID;

-    // Read ID

-    long len;

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result)  // error, or too few available bytes

-      return result;

-    if ((total >= 0) && ((pos + len) > total))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > available)

-      return pos + len;

-    const long long idpos = pos;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume ID

-    // Read Size

-    result = GetUIntLength(pReader, pos, len);

-    if (result)  // error, or too few available bytes

-      return result;

-    if ((total >= 0) && ((pos + len) > total))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > available)

-      return pos + len;

-    long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return size;

-    pos += len;  // consume length of size of element

-    // Pos now points to start of payload

-    // Handle "unknown size" for live streaming of webm files.

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (id == mkvmuxer::kMkvSegment) {

-      if (size == unknown_size)

-        size = -1;

-      else if (total < 0)

-        size = -1;

-      else if ((pos + size) > total)

-        size = -1;

-      pSegment = new (std::nothrow) Segment(pReader, idpos, pos, size);

-      if (pSegment == NULL)

-        return E_PARSE_FAILED;

-      return 0;  // success

-    }

-    if (size == unknown_size)

-      return E_FILE_FORMAT_INVALID;

-    if ((total >= 0) && ((pos + size) > total))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + size) > available)

-      return pos + size;

-    pos += size;  // consume payload

-  }

-}

-long long Segment::ParseHeaders() {

-  // Outermost (level 0) segment object has been constructed,

-  // and pos designates start of payload.  We need to find the

-  // inner (level 1) elements.

-  long long total, available;

-  const int status = m_pReader->Length(&total, &available);

-  if (status < 0)  // error

-    return status;

-  if (total > 0 && available > total)

-    return E_FILE_FORMAT_INVALID;

-  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

-  if ((segment_stop >= 0 && total >= 0 && segment_stop > total) ||

-      (segment_stop >= 0 && m_pos > segment_stop)) {

-    return E_FILE_FORMAT_INVALID;

-  }

-  for (;;) {

-    if ((total >= 0) && (m_pos >= total))

-      break;

-    if ((segment_stop >= 0) && (m_pos >= segment_stop))

-      break;

-    long long pos = m_pos;

-    const long long element_start = pos;

-    // Avoid rolling over pos when very close to LLONG_MAX.

-    unsigned long long rollover_check = pos + 1ULL;

-    if (rollover_check > LLONG_MAX)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + 1) > available)

-      return (pos + 1);

-    long len;

-    long long result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return result;

-    if (result > 0) {

-      // MkvReader doesn't have enough data to satisfy this read attempt.

-      return (pos + 1);

-    }

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > available)

-      return pos + len;

-    const long long idpos = pos;

-    const long long id = ReadID(m_pReader, idpos, len);

-    if (id < 0)

-      return E_FILE_FORMAT_INVALID;

-    if (id == mkvmuxer::kMkvCluster)

-      break;

-    pos += len;  // consume ID

-    if ((pos + 1) > available)

-      return (pos + 1);

-    // Read Size

-    result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return result;

-    if (result > 0) {

-      // MkvReader doesn't have enough data to satisfy this read attempt.

-      return (pos + 1);

-    }

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > available)

-      return pos + len;

-    const long long size = ReadUInt(m_pReader, pos, len);

-    if (size < 0 || len < 1 || len > 8) {

-      // TODO(tomfinegan): ReadUInt should return an error when len is < 1 or

-      // len > 8 is true instead of checking this _everywhere_.

-      return size;

-    }

-    pos += len;  // consume length of size of element

-    // Avoid rolling over pos when very close to LLONG_MAX.

-    rollover_check = static_cast<unsigned long long>(pos) + size;

-    if (rollover_check > LLONG_MAX)

-      return E_FILE_FORMAT_INVALID;

-    const long long element_size = size + pos - element_start;

-    // Pos now points to start of payload

-    if ((segment_stop >= 0) && ((pos + size) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    // We read EBML elements either in total or nothing at all.

-    if ((pos + size) > available)

-      return pos + size;

-    if (id == mkvmuxer::kMkvInfo) {

-      if (m_pInfo)

-        return E_FILE_FORMAT_INVALID;

-      m_pInfo = new (std::nothrow)

-          SegmentInfo(this, pos, size, element_start, element_size);

-      if (m_pInfo == NULL)

-        return -1;

-      const long status = m_pInfo->Parse();

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvTracks) {

-      if (m_pTracks)

-        return E_FILE_FORMAT_INVALID;

-      m_pTracks = new (std::nothrow)

-          Tracks(this, pos, size, element_start, element_size);

-      if (m_pTracks == NULL)

-        return -1;

-      const long status = m_pTracks->Parse();

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvCues) {

-      if (m_pCues == NULL) {

-        m_pCues = new (std::nothrow)

-            Cues(this, pos, size, element_start, element_size);

-        if (m_pCues == NULL)

-          return -1;

-      }

-    } else if (id == mkvmuxer::kMkvSeekHead) {

-      if (m_pSeekHead == NULL) {

-        m_pSeekHead = new (std::nothrow)

-            SeekHead(this, pos, size, element_start, element_size);

-        if (m_pSeekHead == NULL)

-          return -1;

-        const long status = m_pSeekHead->Parse();

-        if (status)

-          return status;

-      }

-    } else if (id == mkvmuxer::kMkvChapters) {

-      if (m_pChapters == NULL) {

-        m_pChapters = new (std::nothrow)

-            Chapters(this, pos, size, element_start, element_size);

-        if (m_pChapters == NULL)

-          return -1;

-        const long status = m_pChapters->Parse();

-        if (status)

-          return status;

-      }

-    } else if (id == mkvmuxer::kMkvTags) {

-      if (m_pTags == NULL) {

-        m_pTags = new (std::nothrow)

-            Tags(this, pos, size, element_start, element_size);

-        if (m_pTags == NULL)

-          return -1;

-        const long status = m_pTags->Parse();

-        if (status)

-          return status;

-      }

-    }

-    m_pos = pos + size;  // consume payload

-  }

-  if (segment_stop >= 0 && m_pos > segment_stop)

-    return E_FILE_FORMAT_INVALID;

-  if (m_pInfo == NULL)  // TODO: liberalize this behavior

-    return E_FILE_FORMAT_INVALID;

-  if (m_pTracks == NULL)

-    return E_FILE_FORMAT_INVALID;

-  return 0;  // success

-}

-long Segment::LoadCluster(long long& pos, long& len) {

-  for (;;) {

-    const long result = DoLoadCluster(pos, len);

-    if (result <= 1)

-      return result;

-  }

-}

-long Segment::DoLoadCluster(long long& pos, long& len) {

-  if (m_pos < 0)

-    return DoLoadClusterUnknownSize(pos, len);

-  long long total, avail;

-  long status = m_pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  if (total >= 0 && avail > total)

-    return E_FILE_FORMAT_INVALID;

-  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

-  long long cluster_off = -1;  // offset relative to start of segment

-  long long cluster_size = -1;  // size of cluster payload

-  for (;;) {

-    if ((total >= 0) && (m_pos >= total))

-      return 1;  // no more clusters

-    if ((segment_stop >= 0) && (m_pos >= segment_stop))

-      return 1;  // no more clusters

-    pos = m_pos;

-    // Read ID

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long idpos = pos;

-    const long long id = ReadID(m_pReader, idpos, len);

-    if (id < 0)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume ID

-    // Read Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(m_pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    pos += len;  // consume length of size of element

-    // pos now points to start of payload

-    if (size == 0) {

-      // Missing element payload: move on.

-      m_pos = pos;

-      continue;

-    }

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if ((segment_stop >= 0) && (size != unknown_size) &&

-        ((pos + size) > segment_stop)) {

-      return E_FILE_FORMAT_INVALID;

-    }

-    if (id == mkvmuxer::kMkvCues) {

-      if (size == unknown_size) {

-        // Cues element of unknown size: Not supported.

-        return E_FILE_FORMAT_INVALID;

-      }

-      if (m_pCues == NULL) {

-        const long long element_size = (pos - idpos) + size;

-        m_pCues = new (std::nothrow) Cues(this, pos, size, idpos, element_size);

-        if (m_pCues == NULL)

-          return -1;

-      }

-      m_pos = pos + size;  // consume payload

-      continue;

-    }

-    if (id != mkvmuxer::kMkvCluster) {

-      // Besides the Segment, Libwebm allows only cluster elements of unknown

-      // size. Fail the parse upon encountering a non-cluster element reporting

-      // unknown size.

-      if (size == unknown_size)

-        return E_FILE_FORMAT_INVALID;

-      m_pos = pos + size;  // consume payload

-      continue;

-    }

-    // We have a cluster.

-    cluster_off = idpos - m_start;  // relative pos

-    if (size != unknown_size)

-      cluster_size = size;

-    break;

-  }

-  if (cluster_off < 0) {

-    // No cluster, die.

-    return E_FILE_FORMAT_INVALID;

-  }

-  long long pos_;

-  long len_;

-  status = Cluster::HasBlockEntries(this, cluster_off, pos_, len_);

-  if (status < 0) {  // error, or underflow

-    pos = pos_;

-    len = len_;

-    return status;

-  }

-  // status == 0 means "no block entries found"

-  // status > 0 means "found at least one block entry"

-  // TODO:

-  // The issue here is that the segment increments its own

-  // pos ptr past the most recent cluster parsed, and then

-  // starts from there to parse the next cluster.  If we

-  // don't know the size of the current cluster, then we

-  // must either parse its payload (as we do below), looking

-  // for the cluster (or cues) ID to terminate the parse.

-  // This isn't really what we want: rather, we really need

-  // a way to create the curr cluster object immediately.

-  // The pity is that cluster::parse can determine its own

-  // boundary, and we largely duplicate that same logic here.

-  //

-  // Maybe we need to get rid of our look-ahead preloading

-  // in source::parse???

-  //

-  // As we're parsing the blocks in the curr cluster

-  //(in cluster::parse), we should have some way to signal

-  // to the segment that we have determined the boundary,

-  // so it can adjust its own segment::m_pos member.

-  //

-  // The problem is that we're asserting in asyncreadinit,

-  // because we adjust the pos down to the curr seek pos,

-  // and the resulting adjusted len is > 2GB.  I'm suspicious

-  // that this is even correct, but even if it is, we can't

-  // be loading that much data in the cache anyway.

-  const long idx = m_clusterCount;

-  if (m_clusterPreloadCount > 0) {

-    if (idx >= m_clusterSize)

-      return E_FILE_FORMAT_INVALID;

-    Cluster* const pCluster = m_clusters[idx];

-    if (pCluster == NULL || pCluster->m_index >= 0)

-      return E_FILE_FORMAT_INVALID;

-    const long long off = pCluster->GetPosition();

-    if (off < 0)

-      return E_FILE_FORMAT_INVALID;

-    if (off == cluster_off) {  // preloaded already

-      if (status == 0)  // no entries found

-        return E_FILE_FORMAT_INVALID;

-      if (cluster_size >= 0)

-        pos += cluster_size;

-      else {

-        const long long element_size = pCluster->GetElementSize();

-        if (element_size <= 0)

-          return E_FILE_FORMAT_INVALID;  // TODO: handle this case

-        pos = pCluster->m_element_start + element_size;

-      }

-      pCluster->m_index = idx;  // move from preloaded to loaded

-      ++m_clusterCount;

-      --m_clusterPreloadCount;

-      m_pos = pos;  // consume payload

-      if (segment_stop >= 0 && m_pos > segment_stop)

-        return E_FILE_FORMAT_INVALID;

-      return 0;  // success

-    }

-  }

-  if (status == 0) {  // no entries found

-    if (cluster_size >= 0)

-      pos += cluster_size;

-    if ((total >= 0) && (pos >= total)) {

-      m_pos = total;

-      return 1;  // no more clusters

-    }

-    if ((segment_stop >= 0) && (pos >= segment_stop)) {

-      m_pos = segment_stop;

-      return 1;  // no more clusters

-    }

-    m_pos = pos;

-    return 2;  // try again

-  }

-  // status > 0 means we have an entry

-  Cluster* const pCluster = Cluster::Create(this, idx, cluster_off);

-  if (pCluster == NULL)

-    return -1;

-  if (!AppendCluster(pCluster)) {

-    delete pCluster;

-    return -1;

-  }

-  if (cluster_size >= 0) {

-    pos += cluster_size;

-    m_pos = pos;

-    if (segment_stop > 0 && m_pos > segment_stop)

-      return E_FILE_FORMAT_INVALID;

-    return 0;

-  }

-  m_pUnknownSize = pCluster;

-  m_pos = -pos;

-  return 0;  // partial success, since we have a new cluster

-  // status == 0 means "no block entries found"

-  // pos designates start of payload

-  // m_pos has NOT been adjusted yet (in case we need to come back here)

-}

-long Segment::DoLoadClusterUnknownSize(long long& pos, long& len) {

-  if (m_pos >= 0 || m_pUnknownSize == NULL)

-    return E_PARSE_FAILED;

-  const long status = m_pUnknownSize->Parse(pos, len);

-  if (status < 0)  // error or underflow

-    return status;

-  if (status == 0)  // parsed a block

-    return 2;  // continue parsing

-  const long long start = m_pUnknownSize->m_element_start;

-  const long long size = m_pUnknownSize->GetElementSize();

-  if (size < 0)

-    return E_FILE_FORMAT_INVALID;

-  pos = start + size;

-  m_pos = pos;

-  m_pUnknownSize = 0;

-  return 2;  // continue parsing

-}

-bool Segment::AppendCluster(Cluster* pCluster) {

-  if (pCluster == NULL || pCluster->m_index < 0)

-    return false;

-  const long count = m_clusterCount + m_clusterPreloadCount;

-  long& size = m_clusterSize;

-  const long idx = pCluster->m_index;

-  if (size < count || idx != m_clusterCount)

-    return false;

-  if (count >= size) {

-    const long n = (size <= 0) ? 2048 : 2 * size;

-    Cluster** const qq = new (std::nothrow) Cluster*[n];

-    if (qq == NULL)

-      return false;

-    Cluster** q = qq;

-    Cluster** p = m_clusters;

-    Cluster** const pp = p + count;

-    while (p != pp)

-      *q++ = *p++;

-    delete[] m_clusters;

-    m_clusters = qq;

-    size = n;

-  }

-  if (m_clusterPreloadCount > 0) {

-    Cluster** const p = m_clusters + m_clusterCount;

-    if (*p == NULL || (*p)->m_index >= 0)

-      return false;

-    Cluster** q = p + m_clusterPreloadCount;

-    if (q >= (m_clusters + size))

-      return false;

-    for (;;) {

-      Cluster** const qq = q - 1;

-      if ((*qq)->m_index >= 0)

-        return false;

-      *q = *qq;

-      q = qq;

-      if (q == p)

-        break;

-    }

-  }

-  m_clusters[idx] = pCluster;

-  ++m_clusterCount;

-  return true;

-}

-bool Segment::PreloadCluster(Cluster* pCluster, ptrdiff_t idx) {

-  if (pCluster == NULL || pCluster->m_index >= 0 || idx < m_clusterCount)

-    return false;

-  const long count = m_clusterCount + m_clusterPreloadCount;

-  long& size = m_clusterSize;

-  if (size < count)

-    return false;

-  if (count >= size) {

-    const long n = (size <= 0) ? 2048 : 2 * size;

-    Cluster** const qq = new (std::nothrow) Cluster*[n];

-    if (qq == NULL)

-      return false;

-    Cluster** q = qq;

-    Cluster** p = m_clusters;

-    Cluster** const pp = p + count;

-    while (p != pp)

-      *q++ = *p++;

-    delete[] m_clusters;

-    m_clusters = qq;

-    size = n;

-  }

-  if (m_clusters == NULL)

-    return false;

-  Cluster** const p = m_clusters + idx;

-  Cluster** q = m_clusters + count;

-  if (q < p || q >= (m_clusters + size))

-    return false;

-  while (q > p) {

-    Cluster** const qq = q - 1;

-    if ((*qq)->m_index >= 0)

-      return false;

-    *q = *qq;

-    q = qq;

-  }

-  m_clusters[idx] = pCluster;

-  ++m_clusterPreloadCount;

-  return true;

-}

-long Segment::Load() {

-  if (m_clusters != NULL || m_clusterSize != 0 || m_clusterCount != 0)

-    return E_PARSE_FAILED;

-  // Outermost (level 0) segment object has been constructed,

-  // and pos designates start of payload.  We need to find the

-  // inner (level 1) elements.

-  const long long header_status = ParseHeaders();

-  if (header_status < 0)  // error

-    return static_cast<long>(header_status);

-  if (header_status > 0)  // underflow

-    return E_BUFFER_NOT_FULL;

-  if (m_pInfo == NULL || m_pTracks == NULL)

-    return E_FILE_FORMAT_INVALID;

-  for (;;) {

-    const int status = LoadCluster();

-    if (status < 0)  // error

-      return status;

-    if (status >= 1)  // no more clusters

-      return 0;

-  }

-}

-SeekHead::SeekHead(Segment* pSegment, long long start, long long size_,

-                   long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_start(start),

-      m_size(size_),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_entries(0),

-      m_entry_count(0),

-      m_void_elements(0),

-      m_void_element_count(0) {}

-SeekHead::~SeekHead() {

-  delete[] m_entries;

-  delete[] m_void_elements;

-}

-long SeekHead::Parse() {

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = m_start;

-  const long long stop = m_start + m_size;

-  // first count the seek head entries

-  int entry_count = 0;

-  int void_element_count = 0;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvSeek)

-      ++entry_count;

-    else if (id == mkvmuxer::kMkvVoid)

-      ++void_element_count;

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  m_entries = new (std::nothrow) Entry[entry_count];

-  if (m_entries == NULL)

-    return -1;

-  m_void_elements = new (std::nothrow) VoidElement[void_element_count];

-  if (m_void_elements == NULL)

-    return -1;

-  // now parse the entries and void elements

-  Entry* pEntry = m_entries;

-  VoidElement* pVoidElement = m_void_elements;

-  pos = m_start;

-  while (pos < stop) {

-    const long long idpos = pos;

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvSeek) {

-      if (ParseEntry(pReader, pos, size, pEntry)) {

-        Entry& e = *pEntry++;

-        e.element_start = idpos;

-        e.element_size = (pos + size) - idpos;

-      }

-    } else if (id == mkvmuxer::kMkvVoid) {

-      VoidElement& e = *pVoidElement++;

-      e.element_start = idpos;

-      e.element_size = (pos + size) - idpos;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  ptrdiff_t count_ = ptrdiff_t(pEntry - m_entries);

-  assert(count_ >= 0);

-  assert(count_ <= entry_count);

-  m_entry_count = static_cast<int>(count_);

-  count_ = ptrdiff_t(pVoidElement - m_void_elements);

-  assert(count_ >= 0);

-  assert(count_ <= void_element_count);

-  m_void_element_count = static_cast<int>(count_);

-  return 0;

-}

-int SeekHead::GetCount() const { return m_entry_count; }

-const SeekHead::Entry* SeekHead::GetEntry(int idx) const {

-  if (idx < 0)

-    return 0;

-  if (idx >= m_entry_count)

-    return 0;

-  return m_entries + idx;

-}

-int SeekHead::GetVoidElementCount() const { return m_void_element_count; }

-const SeekHead::VoidElement* SeekHead::GetVoidElement(int idx) const {

-  if (idx < 0)

-    return 0;

-  if (idx >= m_void_element_count)

-    return 0;

-  return m_void_elements + idx;

-}

-long Segment::ParseCues(long long off, long long& pos, long& len) {

-  if (m_pCues)

-    return 0;  // success

-  if (off < 0)

-    return -1;

-  long long total, avail;

-  const int status = m_pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  pos = m_start + off;

-  if ((total < 0) || (pos >= total))

-    return 1;  // don't bother parsing cues

-  const long long element_start = pos;

-  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  long long result = GetUIntLength(m_pReader, pos, len);

-  if (result < 0)  // error

-    return static_cast<long>(result);

-  if (result > 0)  // underflow (weird)

-  {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + len) > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long idpos = pos;

-  const long long id = ReadID(m_pReader, idpos, len);

-  if (id != mkvmuxer::kMkvCues)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume ID

-  assert((segment_stop < 0) || (pos <= segment_stop));

-  // Read Size

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  result = GetUIntLength(m_pReader, pos, len);

-  if (result < 0)  // error

-    return static_cast<long>(result);

-  if (result > 0)  // underflow (weird)

-  {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + len) > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long size = ReadUInt(m_pReader, pos, len);

-  if (size < 0)  // error

-    return static_cast<long>(size);

-  if (size == 0)  // weird, although technically not illegal

-    return 1;  // done

-  pos += len;  // consume length of size of element

-  assert((segment_stop < 0) || (pos <= segment_stop));

-  // Pos now points to start of payload

-  const long long element_stop = pos + size;

-  if ((segment_stop >= 0) && (element_stop > segment_stop))

-    return E_FILE_FORMAT_INVALID;

-  if ((total >= 0) && (element_stop > total))

-    return 1;  // don't bother parsing anymore

-  len = static_cast<long>(size);

-  if (element_stop > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long element_size = element_stop - element_start;

-  m_pCues =

-      new (std::nothrow) Cues(this, pos, size, element_start, element_size);

-  if (m_pCues == NULL)

-    return -1;

-  return 0;  // success

-}

-bool SeekHead::ParseEntry(IMkvReader* pReader, long long start, long long size_,

-                          Entry* pEntry) {

-  if (size_ <= 0)

-    return false;

-  long long pos = start;

-  const long long stop = start + size_;

-  long len;

-  // parse the container for the level-1 element ID

-  const long long seekIdId = ReadID(pReader, pos, len);

-  if (seekIdId < 0)

-    return false;

-  if (seekIdId != mkvmuxer::kMkvSeekID)

-    return false;

-  if ((pos + len) > stop)

-    return false;

-  pos += len;  // consume SeekID id

-  const long long seekIdSize = ReadUInt(pReader, pos, len);

-  if (seekIdSize <= 0)

-    return false;

-  if ((pos + len) > stop)

-    return false;

-  pos += len;  // consume size of field

-  if ((pos + seekIdSize) > stop)

-    return false;

-  // Note that the SeekId payload really is serialized

-  // as a "Matroska integer", not as a plain binary value.

-  // In fact, Matroska requires that ID values in the

-  // stream exactly match the binary representation as listed

-  // in the Matroska specification.

-  //

-  // This parser is more liberal, and permits IDs to have

-  // any width.  (This could make the representation in the stream

-  // different from what's in the spec, but it doesn't matter here,

-  // since we always normalize "Matroska integer" values.)

-  pEntry->id = ReadUInt(pReader, pos, len);  // payload

-  if (pEntry->id <= 0)

-    return false;

-  if (len != seekIdSize)

-    return false;

-  pos += seekIdSize;  // consume SeekID payload

-  const long long seekPosId = ReadID(pReader, pos, len);

-  if (seekPosId != mkvmuxer::kMkvSeekPosition)

-    return false;

-  if ((pos + len) > stop)

-    return false;

-  pos += len;  // consume id

-  const long long seekPosSize = ReadUInt(pReader, pos, len);

-  if (seekPosSize <= 0)

-    return false;

-  if ((pos + len) > stop)

-    return false;

-  pos += len;  // consume size

-  if ((pos + seekPosSize) > stop)

-    return false;

-  pEntry->pos = UnserializeUInt(pReader, pos, seekPosSize);

-  if (pEntry->pos < 0)

-    return false;

-  pos += seekPosSize;  // consume payload

-  if (pos != stop)

-    return false;

-  return true;

-}

-Cues::Cues(Segment* pSegment, long long start_, long long size_,

-           long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_start(start_),

-      m_size(size_),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_cue_points(NULL),

-      m_count(0),

-      m_preload_count(0),

-      m_pos(start_) {}

-Cues::~Cues() {

-  const long n = m_count + m_preload_count;

-  CuePoint** p = m_cue_points;

-  CuePoint** const q = p + n;

-  while (p != q) {

-    CuePoint* const pCP = *p++;

-    assert(pCP);

-    delete pCP;

-  }

-  delete[] m_cue_points;

-}

-long Cues::GetCount() const {

-  if (m_cue_points == NULL)

-    return -1;

-  return m_count;  // TODO: really ignore preload count?

-}

-bool Cues::DoneParsing() const {

-  const long long stop = m_start + m_size;

-  return (m_pos >= stop);

-}

-bool Cues::Init() const {

-  if (m_cue_points)

-    return true;

-  if (m_count != 0 || m_preload_count != 0)

-    return false;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  const long long stop = m_start + m_size;

-  long long pos = m_start;

-  long cue_points_size = 0;

-  while (pos < stop) {

-    const long long idpos = pos;

-    long len;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0 || (pos + len) > stop) {

-      return false;

-    }

-    pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0 || (pos + len > stop)) {

-      return false;

-    }

-    pos += len;  // consume Size field

-    if (pos + size > stop) {

-      return false;

-    }

-    if (id == mkvmuxer::kMkvCuePoint) {

-      if (!PreloadCuePoint(cue_points_size, idpos))

-        return false;

-    }

-    pos += size;  // skip payload

-  }

-  return true;

-}

-bool Cues::PreloadCuePoint(long& cue_points_size, long long pos) const {

-  if (m_count != 0)

-    return false;

-  if (m_preload_count >= cue_points_size) {

-    const long n = (cue_points_size <= 0) ? 2048 : 2 * cue_points_size;

-    CuePoint** const qq = new (std::nothrow) CuePoint*[n];

-    if (qq == NULL)

-      return false;

-    CuePoint** q = qq;  // beginning of target

-    CuePoint** p = m_cue_points;  // beginning of source

-    CuePoint** const pp = p + m_preload_count;  // end of source

-    while (p != pp)

-      *q++ = *p++;

-    delete[] m_cue_points;

-    m_cue_points = qq;

-    cue_points_size = n;

-  }

-  CuePoint* const pCP = new (std::nothrow) CuePoint(m_preload_count, pos);

-  if (pCP == NULL)

-    return false;

-  m_cue_points[m_preload_count++] = pCP;

-  return true;

-}

-bool Cues::LoadCuePoint() const {

-  const long long stop = m_start + m_size;

-  if (m_pos >= stop)

-    return false;  // nothing else to do

-  if (!Init()) {

-    m_pos = stop;

-    return false;

-  }

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  while (m_pos < stop) {

-    const long long idpos = m_pos;

-    long len;

-    const long long id = ReadID(pReader, m_pos, len);

-    if (id < 0 || (m_pos + len) > stop)

-      return false;

-    m_pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, m_pos, len);

-    if (size < 0 || (m_pos + len) > stop)

-      return false;

-    m_pos += len;  // consume Size field

-    if ((m_pos + size) > stop)

-      return false;

-    if (id != mkvmuxer::kMkvCuePoint) {

-      m_pos += size;  // consume payload

-      if (m_pos > stop)

-        return false;

-      continue;

-    }

-    if (m_preload_count < 1)

-      return false;

-    CuePoint* const pCP = m_cue_points[m_count];

-    if (!pCP || (pCP->GetTimeCode() < 0 && (-pCP->GetTimeCode() != idpos)))

-      return false;

-    if (!pCP->Load(pReader)) {

-      m_pos = stop;

-      return false;

-    }

-    ++m_count;

-    --m_preload_count;

-    m_pos += size;  // consume payload

-    if (m_pos > stop)

-      return false;

-    return true;  // yes, we loaded a cue point

-  }

-  return false;  // no, we did not load a cue point

-}

-bool Cues::Find(long long time_ns, const Track* pTrack, const CuePoint*& pCP,

-                const CuePoint::TrackPosition*& pTP) const {

-  if (time_ns < 0 || pTrack == NULL || m_cue_points == NULL || m_count == 0)

-    return false;

-  CuePoint** const ii = m_cue_points;

-  CuePoint** i = ii;

-  CuePoint** const jj = ii + m_count;

-  CuePoint** j = jj;

-  pCP = *i;

-  if (pCP == NULL)

-    return false;

-  if (time_ns <= pCP->GetTime(m_pSegment)) {

-    pTP = pCP->Find(pTrack);

-    return (pTP != NULL);

-  }

-  while (i < j) {

-    // INVARIANT:

-    //[ii, i) <= time_ns

-    //[i, j)  ?

-    //[j, jj) > time_ns

-    CuePoint** const k = i + (j - i) / 2;

-    if (k >= jj)

-      return false;

-    CuePoint* const pCP = *k;

-    if (pCP == NULL)

-      return false;

-    const long long t = pCP->GetTime(m_pSegment);

-    if (t <= time_ns)

-      i = k + 1;

-    else

-      j = k;

-    if (i > j)

-      return false;

-  }

-  if (i != j || i > jj || i <= ii)

-    return false;

-  pCP = *--i;

-  if (pCP == NULL || pCP->GetTime(m_pSegment) > time_ns)

-    return false;

-  // TODO: here and elsewhere, it's probably not correct to search

-  // for the cue point with this time, and then search for a matching

-  // track.  In principle, the matching track could be on some earlier

-  // cue point, and with our current algorithm, we'd miss it.  To make

-  // this bullet-proof, we'd need to create a secondary structure,

-  // with a list of cue points that apply to a track, and then search

-  // that track-based structure for a matching cue point.

-  pTP = pCP->Find(pTrack);

-  return (pTP != NULL);

-}

-const CuePoint* Cues::GetFirst() const {

-  if (m_cue_points == NULL || m_count == 0)

-    return NULL;

-  CuePoint* const* const pp = m_cue_points;

-  if (pp == NULL)

-    return NULL;

-  CuePoint* const pCP = pp[0];

-  if (pCP == NULL || pCP->GetTimeCode() < 0)

-    return NULL;

-  return pCP;

-}

-const CuePoint* Cues::GetLast() const {

-  if (m_cue_points == NULL || m_count <= 0)

-    return NULL;

-  const long index = m_count - 1;

-  CuePoint* const* const pp = m_cue_points;

-  if (pp == NULL)

-    return NULL;

-  CuePoint* const pCP = pp[index];

-  if (pCP == NULL || pCP->GetTimeCode() < 0)

-    return NULL;

-  return pCP;

-}

-const CuePoint* Cues::GetNext(const CuePoint* pCurr) const {

-  if (pCurr == NULL || pCurr->GetTimeCode() < 0 ||

-      m_cue_points == NULL || m_count < 1) {

-    return NULL;

-  }

-  long index = pCurr->m_index;

-  if (index >= m_count)

-    return NULL;

-  CuePoint* const* const pp = m_cue_points;

-  if (pp == NULL || pp[index] != pCurr)

-    return NULL;

-  ++index;

-  if (index >= m_count)

-    return NULL;

-  CuePoint* const pNext = pp[index];

-  if (pNext == NULL || pNext->GetTimeCode() < 0)

-    return NULL;

-  return pNext;

-}

-const BlockEntry* Cues::GetBlock(const CuePoint* pCP,

-                                 const CuePoint::TrackPosition* pTP) const {

-  if (pCP == NULL || pTP == NULL)

-    return NULL;

-  return m_pSegment->GetBlock(*pCP, *pTP);

-}

-const BlockEntry* Segment::GetBlock(const CuePoint& cp,

-                                    const CuePoint::TrackPosition& tp) {

-  Cluster** const ii = m_clusters;

-  Cluster** i = ii;

-  const long count = m_clusterCount + m_clusterPreloadCount;

-  Cluster** const jj = ii + count;

-  Cluster** j = jj;

-  while (i < j) {

-    // INVARIANT:

-    //[ii, i) < pTP->m_pos

-    //[i, j) ?

-    //[j, jj)  > pTP->m_pos

-    Cluster** const k = i + (j - i) / 2;

-    assert(k < jj);

-    Cluster* const pCluster = *k;

-    assert(pCluster);

-    // const long long pos_ = pCluster->m_pos;

-    // assert(pos_);

-    // const long long pos = pos_ * ((pos_ < 0) ? -1 : 1);

-    const long long pos = pCluster->GetPosition();

-    assert(pos >= 0);

-    if (pos < tp.m_pos)

-      i = k + 1;

-    else if (pos > tp.m_pos)

-      j = k;

-    else

-      return pCluster->GetEntry(cp, tp);

-  }

-  assert(i == j);

-  // assert(Cluster::HasBlockEntries(this, tp.m_pos));

-  Cluster* const pCluster = Cluster::Create(this, -1, tp.m_pos);  //, -1);

-  if (pCluster == NULL)

-    return NULL;

-  const ptrdiff_t idx = i - m_clusters;

-  if (!PreloadCluster(pCluster, idx)) {

-    delete pCluster;

-    return NULL;

-  }

-  assert(m_clusters);

-  assert(m_clusterPreloadCount > 0);

-  assert(m_clusters[idx] == pCluster);

-  return pCluster->GetEntry(cp, tp);

-}

-const Cluster* Segment::FindOrPreloadCluster(long long requested_pos) {

-  if (requested_pos < 0)

-    return 0;

-  Cluster** const ii = m_clusters;

-  Cluster** i = ii;

-  const long count = m_clusterCount + m_clusterPreloadCount;

-  Cluster** const jj = ii + count;

-  Cluster** j = jj;

-  while (i < j) {

-    // INVARIANT:

-    //[ii, i) < pTP->m_pos

-    //[i, j) ?

-    //[j, jj)  > pTP->m_pos

-    Cluster** const k = i + (j - i) / 2;

-    assert(k < jj);

-    Cluster* const pCluster = *k;

-    assert(pCluster);

-    // const long long pos_ = pCluster->m_pos;

-    // assert(pos_);

-    // const long long pos = pos_ * ((pos_ < 0) ? -1 : 1);

-    const long long pos = pCluster->GetPosition();

-    assert(pos >= 0);

-    if (pos < requested_pos)

-      i = k + 1;

-    else if (pos > requested_pos)

-      j = k;

-    else

-      return pCluster;

-  }

-  assert(i == j);

-  // assert(Cluster::HasBlockEntries(this, tp.m_pos));

-  Cluster* const pCluster = Cluster::Create(this, -1, requested_pos);

-  if (pCluster == NULL)

-    return NULL;

-  const ptrdiff_t idx = i - m_clusters;

-  if (!PreloadCluster(pCluster, idx)) {

-    delete pCluster;

-    return NULL;

-  }

-  assert(m_clusters);

-  assert(m_clusterPreloadCount > 0);

-  assert(m_clusters[idx] == pCluster);

-  return pCluster;

-}

-CuePoint::CuePoint(long idx, long long pos)

-    : m_element_start(0),

-      m_element_size(0),

-      m_index(idx),

-      m_timecode(-1 * pos),

-      m_track_positions(NULL),

-      m_track_positions_count(0) {

-  assert(pos > 0);

-}

-CuePoint::~CuePoint() { delete[] m_track_positions; }

-bool CuePoint::Load(IMkvReader* pReader) {

-  // odbgstream os;

-  // os << "CuePoint::Load(begin): timecode=" << m_timecode << endl;

-  if (m_timecode >= 0)  // already loaded

-    return true;

-  assert(m_track_positions == NULL);

-  assert(m_track_positions_count == 0);

-  long long pos_ = -m_timecode;

-  const long long element_start = pos_;

-  long long stop;

-  {

-    long len;

-    const long long id = ReadID(pReader, pos_, len);

-    if (id != mkvmuxer::kMkvCuePoint)

-      return false;

-    pos_ += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos_, len);

-    assert(size >= 0);

-    pos_ += len;  // consume Size field

-    // pos_ now points to start of payload

-    stop = pos_ + size;

-  }

-  const long long element_size = stop - element_start;

-  long long pos = pos_;

-  // First count number of track positions

-  while (pos < stop) {

-    long len;

-    const long long id = ReadID(pReader, pos, len);

-    if ((id < 0) || (pos + len > stop)) {

-      return false;

-    }

-    pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos, len);

-    if ((size < 0) || (pos + len > stop)) {

-      return false;

-    }

-    pos += len;  // consume Size field

-    if ((pos + size) > stop) {

-      return false;

-    }

-    if (id == mkvmuxer::kMkvCueTime)

-      m_timecode = UnserializeUInt(pReader, pos, size);

-    else if (id == mkvmuxer::kMkvCueTrackPositions)

-      ++m_track_positions_count;

-    pos += size;  // consume payload

-  }

-  if (m_timecode < 0 || m_track_positions_count <= 0) {

-    return false;

-  }

-  // os << "CuePoint::Load(cont'd): idpos=" << idpos

-  //   << " timecode=" << m_timecode

-  //   << endl;

-  m_track_positions = new (std::nothrow) TrackPosition[m_track_positions_count];

-  if (m_track_positions == NULL)

-    return false;

-  // Now parse track positions

-  TrackPosition* p = m_track_positions;

-  pos = pos_;

-  while (pos < stop) {

-    long len;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0 || (pos + len) > stop)

-      return false;

-    pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos, len);

-    assert(size >= 0);

-    assert((pos + len) <= stop);

-    pos += len;  // consume Size field

-    assert((pos + size) <= stop);

-    if (id == mkvmuxer::kMkvCueTrackPositions) {

-      TrackPosition& tp = *p++;

-      if (!tp.Parse(pReader, pos, size)) {

-        return false;

-      }

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return false;

-  }

-  assert(size_t(p - m_track_positions) == m_track_positions_count);

-  m_element_start = element_start;

-  m_element_size = element_size;

-  return true;

-}

-bool CuePoint::TrackPosition::Parse(IMkvReader* pReader, long long start_,

-                                    long long size_) {

-  const long long stop = start_ + size_;

-  long long pos = start_;

-  m_track = -1;

-  m_pos = -1;

-  m_block = 1;  // default

-  while (pos < stop) {

-    long len;

-    const long long id = ReadID(pReader, pos, len);

-    if ((id < 0) || ((pos + len) > stop)) {

-      return false;

-    }

-    pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos, len);

-    if ((size < 0) || ((pos + len) > stop)) {

-      return false;

-    }

-    pos += len;  // consume Size field

-    if ((pos + size) > stop) {

-      return false;

-    }

-    if (id == mkvmuxer::kMkvCueTrack)

-      m_track = UnserializeUInt(pReader, pos, size);

-    else if (id == mkvmuxer::kMkvCueClusterPosition)

-      m_pos = UnserializeUInt(pReader, pos, size);

-    else if (id == mkvmuxer::kMkvCueBlockNumber)

-      m_block = UnserializeUInt(pReader, pos, size);

-    pos += size;  // consume payload

-  }

-  if ((m_pos < 0) || (m_track <= 0)) {

-    return false;

-  }

-  return true;

-}

-const CuePoint::TrackPosition* CuePoint::Find(const Track* pTrack) const {

-  assert(pTrack);

-  const long long n = pTrack->GetNumber();

-  const TrackPosition* i = m_track_positions;

-  const TrackPosition* const j = i + m_track_positions_count;

-  while (i != j) {

-    const TrackPosition& p = *i++;

-    if (p.m_track == n)

-      return &p;

-  }

-  return NULL;  // no matching track number found

-}

-long long CuePoint::GetTimeCode() const { return m_timecode; }

-long long CuePoint::GetTime(const Segment* pSegment) const {

-  assert(pSegment);

-  assert(m_timecode >= 0);

-  const SegmentInfo* const pInfo = pSegment->GetInfo();

-  assert(pInfo);

-  const long long scale = pInfo->GetTimeCodeScale();

-  assert(scale >= 1);

-  const long long time = scale * m_timecode;

-  return time;

-}

-bool Segment::DoneParsing() const {

-  if (m_size < 0) {

-    long long total, avail;

-    const int status = m_pReader->Length(&total, &avail);

-    if (status < 0)  // error

-      return true;  // must assume done

-    if (total < 0)

-      return false;  // assume live stream

-    return (m_pos >= total);

-  }

-  const long long stop = m_start + m_size;

-  return (m_pos >= stop);

-}

-const Cluster* Segment::GetFirst() const {

-  if ((m_clusters == NULL) || (m_clusterCount <= 0))

-    return &m_eos;

-  Cluster* const pCluster = m_clusters[0];

-  assert(pCluster);

-  return pCluster;

-}

-const Cluster* Segment::GetLast() const {

-  if ((m_clusters == NULL) || (m_clusterCount <= 0))

-    return &m_eos;

-  const long idx = m_clusterCount - 1;

-  Cluster* const pCluster = m_clusters[idx];

-  assert(pCluster);

-  return pCluster;

-}

-unsigned long Segment::GetCount() const { return m_clusterCount; }

-const Cluster* Segment::GetNext(const Cluster* pCurr) {

-  assert(pCurr);

-  assert(pCurr != &m_eos);

-  assert(m_clusters);

-  long idx = pCurr->m_index;

-  if (idx >= 0) {

-    assert(m_clusterCount > 0);

-    assert(idx < m_clusterCount);

-    assert(pCurr == m_clusters[idx]);

-    ++idx;

-    if (idx >= m_clusterCount)

-      return &m_eos;  // caller will LoadCluster as desired

-    Cluster* const pNext = m_clusters[idx];

-    assert(pNext);

-    assert(pNext->m_index >= 0);

-    assert(pNext->m_index == idx);

-    return pNext;

-  }

-  assert(m_clusterPreloadCount > 0);

-  long long pos = pCurr->m_element_start;

-  assert(m_size >= 0);  // TODO

-  const long long stop = m_start + m_size;  // end of segment

-  {

-    long len;

-    long long result = GetUIntLength(m_pReader, pos, len);

-    assert(result == 0);

-    assert((pos + len) <= stop);  // TODO

-    if (result != 0)

-      return NULL;

-    const long long id = ReadID(m_pReader, pos, len);

-    if (id != mkvmuxer::kMkvCluster)

-      return NULL;

-    pos += len;  // consume ID

-    // Read Size

-    result = GetUIntLength(m_pReader, pos, len);

-    assert(result == 0);  // TODO

-    assert((pos + len) <= stop);  // TODO

-    const long long size = ReadUInt(m_pReader, pos, len);

-    assert(size > 0);  // TODO

-    // assert((pCurr->m_size <= 0) || (pCurr->m_size == size));

-    pos += len;  // consume length of size of element

-    assert((pos + size) <= stop);  // TODO

-    // Pos now points to start of payload

-    pos += size;  // consume payload

-  }

-  long long off_next = 0;

-  while (pos < stop) {

-    long len;

-    long long result = GetUIntLength(m_pReader, pos, len);

-    assert(result == 0);

-    assert((pos + len) <= stop);  // TODO

-    if (result != 0)

-      return NULL;

-    const long long idpos = pos;  // pos of next (potential) cluster

-    const long long id = ReadID(m_pReader, idpos, len);

-    if (id < 0)

-      return NULL;

-    pos += len;  // consume ID

-    // Read Size

-    result = GetUIntLength(m_pReader, pos, len);

-    assert(result == 0);  // TODO

-    assert((pos + len) <= stop);  // TODO

-    const long long size = ReadUInt(m_pReader, pos, len);

-    assert(size >= 0);  // TODO

-    pos += len;  // consume length of size of element

-    assert((pos + size) <= stop);  // TODO

-    // Pos now points to start of payload

-    if (size == 0)  // weird

-      continue;

-    if (id == mkvmuxer::kMkvCluster) {

-      const long long off_next_ = idpos - m_start;

-      long long pos_;

-      long len_;

-      const long status = Cluster::HasBlockEntries(this, off_next_, pos_, len_);

-      assert(status >= 0);

-      if (status > 0) {

-        off_next = off_next_;

-        break;

-      }

-    }

-    pos += size;  // consume payload

-  }

-  if (off_next <= 0)

-    return 0;

-  Cluster** const ii = m_clusters + m_clusterCount;

-  Cluster** i = ii;

-  Cluster** const jj = ii + m_clusterPreloadCount;

-  Cluster** j = jj;

-  while (i < j) {

-    // INVARIANT:

-    //[0, i) < pos_next

-    //[i, j) ?

-    //[j, jj)  > pos_next

-    Cluster** const k = i + (j - i) / 2;

-    assert(k < jj);

-    Cluster* const pNext = *k;

-    assert(pNext);

-    assert(pNext->m_index < 0);

-    // const long long pos_ = pNext->m_pos;

-    // assert(pos_);

-    // pos = pos_ * ((pos_ < 0) ? -1 : 1);

-    pos = pNext->GetPosition();

-    if (pos < off_next)

-      i = k + 1;

-    else if (pos > off_next)

-      j = k;

-    else

-      return pNext;

-  }

-  assert(i == j);

-  Cluster* const pNext = Cluster::Create(this, -1, off_next);

-  if (pNext == NULL)

-    return NULL;

-  const ptrdiff_t idx_next = i - m_clusters;  // insertion position

-  if (!PreloadCluster(pNext, idx_next)) {

-    delete pNext;

-    return NULL;

-  }

-  assert(m_clusters);

-  assert(idx_next < m_clusterSize);

-  assert(m_clusters[idx_next] == pNext);

-  return pNext;

-}

-long Segment::ParseNext(const Cluster* pCurr, const Cluster*& pResult,

-                        long long& pos, long& len) {

-  assert(pCurr);

-  assert(!pCurr->EOS());

-  assert(m_clusters);

-  pResult = 0;

-  if (pCurr->m_index >= 0) {  // loaded (not merely preloaded)

-    assert(m_clusters[pCurr->m_index] == pCurr);

-    const long next_idx = pCurr->m_index + 1;

-    if (next_idx < m_clusterCount) {

-      pResult = m_clusters[next_idx];

-      return 0;  // success

-    }

-    // curr cluster is last among loaded

-    const long result = LoadCluster(pos, len);

-    if (result < 0)  // error or underflow

-      return result;

-    if (result > 0)  // no more clusters

-    {

-      // pResult = &m_eos;

-      return 1;

-    }

-    pResult = GetLast();

-    return 0;  // success

-  }

-  assert(m_pos > 0);

-  long long total, avail;

-  long status = m_pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

-  // interrogate curr cluster

-  pos = pCurr->m_element_start;

-  if (pCurr->m_element_size >= 0)

-    pos += pCurr->m_element_size;

-  else {

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadUInt(m_pReader, pos, len);

-    if (id != mkvmuxer::kMkvCluster)

-      return -1;

-    pos += len;  // consume ID

-    // Read Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(m_pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    pos += len;  // consume size field

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size == unknown_size)  // TODO: should never happen

-      return E_FILE_FORMAT_INVALID;  // TODO: resolve this

-    // assert((pCurr->m_size <= 0) || (pCurr->m_size == size));

-    if ((segment_stop >= 0) && ((pos + size) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    // Pos now points to start of payload

-    pos += size;  // consume payload (that is, the current cluster)

-    if (segment_stop >= 0 && pos > segment_stop)

-      return E_FILE_FORMAT_INVALID;

-    // By consuming the payload, we are assuming that the curr

-    // cluster isn't interesting.  That is, we don't bother checking

-    // whether the payload of the curr cluster is less than what

-    // happens to be available (obtained via IMkvReader::Length).

-    // Presumably the caller has already dispensed with the current

-    // cluster, and really does want the next cluster.

-  }

-  // pos now points to just beyond the last fully-loaded cluster

-  for (;;) {

-    const long status = DoParseNext(pResult, pos, len);

-    if (status <= 1)

-      return status;

-  }

-}

-long Segment::DoParseNext(const Cluster*& pResult, long long& pos, long& len) {

-  long long total, avail;

-  long status = m_pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

-  // Parse next cluster.  This is strictly a parsing activity.

-  // Creation of a new cluster object happens later, after the

-  // parsing is done.

-  long long off_next = 0;

-  long long cluster_size = -1;

-  for (;;) {

-    if ((total >= 0) && (pos >= total))

-      return 1;  // EOF

-    if ((segment_stop >= 0) && (pos >= segment_stop))

-      return 1;  // EOF

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long idpos = pos;  // absolute

-    const long long idoff = pos - m_start;  // relative

-    const long long id = ReadID(m_pReader, idpos, len);  // absolute

-    if (id < 0)  // error

-      return static_cast<long>(id);

-    if (id == 0)  // weird

-      return -1;  // generic error

-    pos += len;  // consume ID

-    // Read Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(m_pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(m_pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    pos += len;  // consume length of size of element

-    // Pos now points to start of payload

-    if (size == 0)  // weird

-      continue;

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if ((segment_stop >= 0) && (size != unknown_size) &&

-        ((pos + size) > segment_stop)) {

-      return E_FILE_FORMAT_INVALID;

-    }

-    if (id == mkvmuxer::kMkvCues) {

-      if (size == unknown_size)

-        return E_FILE_FORMAT_INVALID;

-      const long long element_stop = pos + size;

-      if ((segment_stop >= 0) && (element_stop > segment_stop))

-        return E_FILE_FORMAT_INVALID;

-      const long long element_start = idpos;

-      const long long element_size = element_stop - element_start;

-      if (m_pCues == NULL) {

-        m_pCues = new (std::nothrow)

-            Cues(this, pos, size, element_start, element_size);

-        if (m_pCues == NULL)

-          return false;

-      }

-      pos += size;  // consume payload

-      if (segment_stop >= 0 && pos > segment_stop)

-        return E_FILE_FORMAT_INVALID;

-      continue;

-    }

-    if (id != mkvmuxer::kMkvCluster) {  // not a Cluster ID

-      if (size == unknown_size)

-        return E_FILE_FORMAT_INVALID;

-      pos += size;  // consume payload

-      if (segment_stop >= 0 && pos > segment_stop)

-        return E_FILE_FORMAT_INVALID;

-      continue;

-    }

-    // We have a cluster.

-    off_next = idoff;

-    if (size != unknown_size)

-      cluster_size = size;

-    break;

-  }

-  assert(off_next > 0);  // have cluster

-  // We have parsed the next cluster.

-  // We have not created a cluster object yet.  What we need

-  // to do now is determine whether it has already be preloaded

-  //(in which case, an object for this cluster has already been

-  // created), and if not, create a new cluster object.

-  Cluster** const ii = m_clusters + m_clusterCount;

-  Cluster** i = ii;

-  Cluster** const jj = ii + m_clusterPreloadCount;

-  Cluster** j = jj;

-  while (i < j) {

-    // INVARIANT:

-    //[0, i) < pos_next

-    //[i, j) ?

-    //[j, jj)  > pos_next

-    Cluster** const k = i + (j - i) / 2;

-    assert(k < jj);

-    const Cluster* const pNext = *k;

-    assert(pNext);

-    assert(pNext->m_index < 0);

-    pos = pNext->GetPosition();

-    assert(pos >= 0);

-    if (pos < off_next)

-      i = k + 1;

-    else if (pos > off_next)

-      j = k;

-    else {

-      pResult = pNext;

-      return 0;  // success

-    }

-  }

-  assert(i == j);

-  long long pos_;

-  long len_;

-  status = Cluster::HasBlockEntries(this, off_next, pos_, len_);

-  if (status < 0) {  // error or underflow

-    pos = pos_;

-    len = len_;

-    return status;

-  }

-  if (status > 0) {  // means "found at least one block entry"

-    Cluster* const pNext = Cluster::Create(this,

-                                           -1,  // preloaded

-                                           off_next);

-    if (pNext == NULL)

-      return -1;

-    const ptrdiff_t idx_next = i - m_clusters;  // insertion position

-    if (!PreloadCluster(pNext, idx_next)) {

-      delete pNext;

-      return -1;

-    }

-    assert(m_clusters);

-    assert(idx_next < m_clusterSize);

-    assert(m_clusters[idx_next] == pNext);

-    pResult = pNext;

-    return 0;  // success

-  }

-  // status == 0 means "no block entries found"

-  if (cluster_size < 0) {  // unknown size

-    const long long payload_pos = pos;  // absolute pos of cluster payload

-    for (;;) {  // determine cluster size

-      if ((total >= 0) && (pos >= total))

-        break;

-      if ((segment_stop >= 0) && (pos >= segment_stop))

-        break;  // no more clusters

-      // Read ID

-      if ((pos + 1) > avail) {

-        len = 1;

-        return E_BUFFER_NOT_FULL;

-      }

-      long long result = GetUIntLength(m_pReader, pos, len);

-      if (result < 0)  // error

-        return static_cast<long>(result);

-      if (result > 0)  // weird

-        return E_BUFFER_NOT_FULL;

-      if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-        return E_FILE_FORMAT_INVALID;

-      if ((pos + len) > avail)

-        return E_BUFFER_NOT_FULL;

-      const long long idpos = pos;

-      const long long id = ReadID(m_pReader, idpos, len);

-      if (id < 0)  // error (or underflow)

-        return static_cast<long>(id);

-      // This is the distinguished set of ID's we use to determine

-      // that we have exhausted the sub-element's inside the cluster

-      // whose ID we parsed earlier.

-      if (id == mkvmuxer::kMkvCluster || id == mkvmuxer::kMkvCues)

-        break;

-      pos += len;  // consume ID (of sub-element)

-      // Read Size

-      if ((pos + 1) > avail) {

-        len = 1;

-        return E_BUFFER_NOT_FULL;

-      }

-      result = GetUIntLength(m_pReader, pos, len);

-      if (result < 0)  // error

-        return static_cast<long>(result);

-      if (result > 0)  // weird

-        return E_BUFFER_NOT_FULL;

-      if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-        return E_FILE_FORMAT_INVALID;

-      if ((pos + len) > avail)

-        return E_BUFFER_NOT_FULL;

-      const long long size = ReadUInt(m_pReader, pos, len);

-      if (size < 0)  // error

-        return static_cast<long>(size);

-      pos += len;  // consume size field of element

-      // pos now points to start of sub-element's payload

-      if (size == 0)  // weird

-        continue;

-      const long long unknown_size = (1LL << (7 * len)) - 1;

-      if (size == unknown_size)

-        return E_FILE_FORMAT_INVALID;  // not allowed for sub-elements

-      if ((segment_stop >= 0) && ((pos + size) > segment_stop))  // weird

-        return E_FILE_FORMAT_INVALID;

-      pos += size;  // consume payload of sub-element

-      if (segment_stop >= 0 && pos > segment_stop)

-        return E_FILE_FORMAT_INVALID;

-    }  // determine cluster size

-    cluster_size = pos - payload_pos;

-    assert(cluster_size >= 0);  // TODO: handle cluster_size = 0

-    pos = payload_pos;  // reset and re-parse original cluster

-  }

-  pos += cluster_size;  // consume payload

-  if (segment_stop >= 0 && pos > segment_stop)

-    return E_FILE_FORMAT_INVALID;

-  return 2;  // try to find a cluster that follows next

-}

-const Cluster* Segment::FindCluster(long long time_ns) const {

-  if ((m_clusters == NULL) || (m_clusterCount <= 0))

-    return &m_eos;

-  {

-    Cluster* const pCluster = m_clusters[0];

-    assert(pCluster);

-    assert(pCluster->m_index == 0);

-    if (time_ns <= pCluster->GetTime())

-      return pCluster;

-  }

-  // Binary search of cluster array

-  long i = 0;

-  long j = m_clusterCount;

-  while (i < j) {

-    // INVARIANT:

-    //[0, i) <= time_ns

-    //[i, j) ?

-    //[j, m_clusterCount)  > time_ns

-    const long k = i + (j - i) / 2;

-    assert(k < m_clusterCount);

-    Cluster* const pCluster = m_clusters[k];

-    assert(pCluster);

-    assert(pCluster->m_index == k);

-    const long long t = pCluster->GetTime();

-    if (t <= time_ns)

-      i = k + 1;

-    else

-      j = k;

-    assert(i <= j);

-  }

-  assert(i == j);

-  assert(i > 0);

-  assert(i <= m_clusterCount);

-  const long k = i - 1;

-  Cluster* const pCluster = m_clusters[k];

-  assert(pCluster);

-  assert(pCluster->m_index == k);

-  assert(pCluster->GetTime() <= time_ns);

-  return pCluster;

-}

-const Tracks* Segment::GetTracks() const { return m_pTracks; }

-const SegmentInfo* Segment::GetInfo() const { return m_pInfo; }

-const Cues* Segment::GetCues() const { return m_pCues; }

-const Chapters* Segment::GetChapters() const { return m_pChapters; }

-const Tags* Segment::GetTags() const { return m_pTags; }

-const SeekHead* Segment::GetSeekHead() const { return m_pSeekHead; }

-long long Segment::GetDuration() const {

-  assert(m_pInfo);

-  return m_pInfo->GetDuration();

-}

-Chapters::Chapters(Segment* pSegment, long long payload_start,

-                   long long payload_size, long long element_start,

-                   long long element_size)

-    : m_pSegment(pSegment),

-      m_start(payload_start),

-      m_size(payload_size),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_editions(NULL),

-      m_editions_size(0),

-      m_editions_count(0) {}

-Chapters::~Chapters() {

-  while (m_editions_count > 0) {

-    Edition& e = m_editions[--m_editions_count];

-    e.Clear();

-  }

-  delete[] m_editions;

-}

-long Chapters::Parse() {

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = m_start;  // payload start

-  const long long stop = pos + m_size;  // payload stop

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)  // weird

-      continue;

-    if (id == mkvmuxer::kMkvEditionEntry) {

-      status = ParseEdition(pos, size);

-      if (status < 0)  // error

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-int Chapters::GetEditionCount() const { return m_editions_count; }

-const Chapters::Edition* Chapters::GetEdition(int idx) const {

-  if (idx < 0)

-    return NULL;

-  if (idx >= m_editions_count)

-    return NULL;

-  return m_editions + idx;

-}

-bool Chapters::ExpandEditionsArray() {

-  if (m_editions_size > m_editions_count)

-    return true;  // nothing else to do

-  const int size = (m_editions_size == 0) ? 1 : 2 * m_editions_size;

-  Edition* const editions = new (std::nothrow) Edition[size];

-  if (editions == NULL)

-    return false;

-  for (int idx = 0; idx < m_editions_count; ++idx) {

-    m_editions[idx].ShallowCopy(editions[idx]);

-  }

-  delete[] m_editions;

-  m_editions = editions;

-  m_editions_size = size;

-  return true;

-}

-long Chapters::ParseEdition(long long pos, long long size) {

-  if (!ExpandEditionsArray())

-    return -1;

-  Edition& e = m_editions[m_editions_count++];

-  e.Init();

-  return e.Parse(m_pSegment->m_pReader, pos, size);

-}

-Chapters::Edition::Edition() {}

-Chapters::Edition::~Edition() {}

-int Chapters::Edition::GetAtomCount() const { return m_atoms_count; }

-const Chapters::Atom* Chapters::Edition::GetAtom(int index) const {

-  if (index < 0)

-    return NULL;

-  if (index >= m_atoms_count)

-    return NULL;

-  return m_atoms + index;

-}

-void Chapters::Edition::Init() {

-  m_atoms = NULL;

-  m_atoms_size = 0;

-  m_atoms_count = 0;

-}

-void Chapters::Edition::ShallowCopy(Edition& rhs) const {

-  rhs.m_atoms = m_atoms;

-  rhs.m_atoms_size = m_atoms_size;

-  rhs.m_atoms_count = m_atoms_count;

-}

-void Chapters::Edition::Clear() {

-  while (m_atoms_count > 0) {

-    Atom& a = m_atoms[--m_atoms_count];

-    a.Clear();

-  }

-  delete[] m_atoms;

-  m_atoms = NULL;

-  m_atoms_size = 0;

-}

-long Chapters::Edition::Parse(IMkvReader* pReader, long long pos,

-                              long long size) {

-  const long long stop = pos + size;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)

-      continue;

-    if (id == mkvmuxer::kMkvChapterAtom) {

-      status = ParseAtom(pReader, pos, size);

-      if (status < 0)  // error

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long Chapters::Edition::ParseAtom(IMkvReader* pReader, long long pos,

-                                  long long size) {

-  if (!ExpandAtomsArray())

-    return -1;

-  Atom& a = m_atoms[m_atoms_count++];

-  a.Init();

-  return a.Parse(pReader, pos, size);

-}

-bool Chapters::Edition::ExpandAtomsArray() {

-  if (m_atoms_size > m_atoms_count)

-    return true;  // nothing else to do

-  const int size = (m_atoms_size == 0) ? 1 : 2 * m_atoms_size;

-  Atom* const atoms = new (std::nothrow) Atom[size];

-  if (atoms == NULL)

-    return false;

-  for (int idx = 0; idx < m_atoms_count; ++idx) {

-    m_atoms[idx].ShallowCopy(atoms[idx]);

-  }

-  delete[] m_atoms;

-  m_atoms = atoms;

-  m_atoms_size = size;

-  return true;

-}

-Chapters::Atom::Atom() {}

-Chapters::Atom::~Atom() {}

-unsigned long long Chapters::Atom::GetUID() const { return m_uid; }

-const char* Chapters::Atom::GetStringUID() const { return m_string_uid; }

-long long Chapters::Atom::GetStartTimecode() const { return m_start_timecode; }

-long long Chapters::Atom::GetStopTimecode() const { return m_stop_timecode; }

-long long Chapters::Atom::GetStartTime(const Chapters* pChapters) const {

-  return GetTime(pChapters, m_start_timecode);

-}

-long long Chapters::Atom::GetStopTime(const Chapters* pChapters) const {

-  return GetTime(pChapters, m_stop_timecode);

-}

-int Chapters::Atom::GetDisplayCount() const { return m_displays_count; }

-const Chapters::Display* Chapters::Atom::GetDisplay(int index) const {

-  if (index < 0)

-    return NULL;

-  if (index >= m_displays_count)

-    return NULL;

-  return m_displays + index;

-}

-void Chapters::Atom::Init() {

-  m_string_uid = NULL;

-  m_uid = 0;

-  m_start_timecode = -1;

-  m_stop_timecode = -1;

-  m_displays = NULL;

-  m_displays_size = 0;

-  m_displays_count = 0;

-}

-void Chapters::Atom::ShallowCopy(Atom& rhs) const {

-  rhs.m_string_uid = m_string_uid;

-  rhs.m_uid = m_uid;

-  rhs.m_start_timecode = m_start_timecode;

-  rhs.m_stop_timecode = m_stop_timecode;

-  rhs.m_displays = m_displays;

-  rhs.m_displays_size = m_displays_size;

-  rhs.m_displays_count = m_displays_count;

-}

-void Chapters::Atom::Clear() {

-  delete[] m_string_uid;

-  m_string_uid = NULL;

-  while (m_displays_count > 0) {

-    Display& d = m_displays[--m_displays_count];

-    d.Clear();

-  }

-  delete[] m_displays;

-  m_displays = NULL;

-  m_displays_size = 0;

-}

-long Chapters::Atom::Parse(IMkvReader* pReader, long long pos, long long size) {

-  const long long stop = pos + size;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)  // 0 length payload, skip.

-      continue;

-    if (id == mkvmuxer::kMkvChapterDisplay) {

-      status = ParseDisplay(pReader, pos, size);

-      if (status < 0)  // error

-        return status;

-    } else if (id == mkvmuxer::kMkvChapterStringUID) {

-      status = UnserializeString(pReader, pos, size, m_string_uid);

-      if (status < 0)  // error

-        return status;

-    } else if (id == mkvmuxer::kMkvChapterUID) {

-      long long val;

-      status = UnserializeInt(pReader, pos, size, val);

-      if (status < 0)  // error

-        return status;

-      m_uid = static_cast<unsigned long long>(val);

-    } else if (id == mkvmuxer::kMkvChapterTimeStart) {

-      const long long val = UnserializeUInt(pReader, pos, size);

-      if (val < 0)  // error

-        return static_cast<long>(val);

-      m_start_timecode = val;

-    } else if (id == mkvmuxer::kMkvChapterTimeEnd) {

-      const long long val = UnserializeUInt(pReader, pos, size);

-      if (val < 0)  // error

-        return static_cast<long>(val);

-      m_stop_timecode = val;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long long Chapters::Atom::GetTime(const Chapters* pChapters,

-                                  long long timecode) {

-  if (pChapters == NULL)

-    return -1;

-  Segment* const pSegment = pChapters->m_pSegment;

-  if (pSegment == NULL)  // weird

-    return -1;

-  const SegmentInfo* const pInfo = pSegment->GetInfo();

-  if (pInfo == NULL)

-    return -1;

-  const long long timecode_scale = pInfo->GetTimeCodeScale();

-  if (timecode_scale < 1)  // weird

-    return -1;

-  if (timecode < 0)

-    return -1;

-  const long long result = timecode_scale * timecode;

-  return result;

-}

-long Chapters::Atom::ParseDisplay(IMkvReader* pReader, long long pos,

-                                  long long size) {

-  if (!ExpandDisplaysArray())

-    return -1;

-  Display& d = m_displays[m_displays_count++];

-  d.Init();

-  return d.Parse(pReader, pos, size);

-}

-bool Chapters::Atom::ExpandDisplaysArray() {

-  if (m_displays_size > m_displays_count)

-    return true;  // nothing else to do

-  const int size = (m_displays_size == 0) ? 1 : 2 * m_displays_size;

-  Display* const displays = new (std::nothrow) Display[size];

-  if (displays == NULL)

-    return false;

-  for (int idx = 0; idx < m_displays_count; ++idx) {

-    m_displays[idx].ShallowCopy(displays[idx]);

-  }

-  delete[] m_displays;

-  m_displays = displays;

-  m_displays_size = size;

-  return true;

-}

-Chapters::Display::Display() {}

-Chapters::Display::~Display() {}

-const char* Chapters::Display::GetString() const { return m_string; }

-const char* Chapters::Display::GetLanguage() const { return m_language; }

-const char* Chapters::Display::GetCountry() const { return m_country; }

-void Chapters::Display::Init() {

-  m_string = NULL;

-  m_language = NULL;

-  m_country = NULL;

-}

-void Chapters::Display::ShallowCopy(Display& rhs) const {

-  rhs.m_string = m_string;

-  rhs.m_language = m_language;

-  rhs.m_country = m_country;

-}

-void Chapters::Display::Clear() {

-  delete[] m_string;

-  m_string = NULL;

-  delete[] m_language;

-  m_language = NULL;

-  delete[] m_country;

-  m_country = NULL;

-}

-long Chapters::Display::Parse(IMkvReader* pReader, long long pos,

-                              long long size) {

-  const long long stop = pos + size;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)  // No payload.

-      continue;

-    if (id == mkvmuxer::kMkvChapString) {

-      status = UnserializeString(pReader, pos, size, m_string);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvChapLanguage) {

-      status = UnserializeString(pReader, pos, size, m_language);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvChapCountry) {

-      status = UnserializeString(pReader, pos, size, m_country);

-      if (status)

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-Tags::Tags(Segment* pSegment, long long payload_start, long long payload_size,

-           long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_start(payload_start),

-      m_size(payload_size),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_tags(NULL),

-      m_tags_size(0),

-      m_tags_count(0) {}

-Tags::~Tags() {

-  while (m_tags_count > 0) {

-    Tag& t = m_tags[--m_tags_count];

-    t.Clear();

-  }

-  delete[] m_tags;

-}

-long Tags::Parse() {

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = m_start;  // payload start

-  const long long stop = pos + m_size;  // payload stop

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)

-      return status;

-    if (size == 0)  // 0 length tag, read another

-      continue;

-    if (id == mkvmuxer::kMkvTag) {

-      status = ParseTag(pos, size);

-      if (status < 0)

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-int Tags::GetTagCount() const { return m_tags_count; }

-const Tags::Tag* Tags::GetTag(int idx) const {

-  if (idx < 0)

-    return NULL;

-  if (idx >= m_tags_count)

-    return NULL;

-  return m_tags + idx;

-}

-bool Tags::ExpandTagsArray() {

-  if (m_tags_size > m_tags_count)

-    return true;  // nothing else to do

-  const int size = (m_tags_size == 0) ? 1 : 2 * m_tags_size;

-  Tag* const tags = new (std::nothrow) Tag[size];

-  if (tags == NULL)

-    return false;

-  for (int idx = 0; idx < m_tags_count; ++idx) {

-    m_tags[idx].ShallowCopy(tags[idx]);

-  }

-  delete[] m_tags;

-  m_tags = tags;

-  m_tags_size = size;

-  return true;

-}

-long Tags::ParseTag(long long pos, long long size) {

-  if (!ExpandTagsArray())

-    return -1;

-  Tag& t = m_tags[m_tags_count++];

-  t.Init();

-  return t.Parse(m_pSegment->m_pReader, pos, size);

-}

-Tags::Tag::Tag() {}

-Tags::Tag::~Tag() {}

-int Tags::Tag::GetSimpleTagCount() const { return m_simple_tags_count; }

-const Tags::SimpleTag* Tags::Tag::GetSimpleTag(int index) const {

-  if (index < 0)

-    return NULL;

-  if (index >= m_simple_tags_count)

-    return NULL;

-  return m_simple_tags + index;

-}

-void Tags::Tag::Init() {

-  m_simple_tags = NULL;

-  m_simple_tags_size = 0;

-  m_simple_tags_count = 0;

-}

-void Tags::Tag::ShallowCopy(Tag& rhs) const {

-  rhs.m_simple_tags = m_simple_tags;

-  rhs.m_simple_tags_size = m_simple_tags_size;

-  rhs.m_simple_tags_count = m_simple_tags_count;

-}

-void Tags::Tag::Clear() {

-  while (m_simple_tags_count > 0) {

-    SimpleTag& d = m_simple_tags[--m_simple_tags_count];

-    d.Clear();

-  }

-  delete[] m_simple_tags;

-  m_simple_tags = NULL;

-  m_simple_tags_size = 0;

-}

-long Tags::Tag::Parse(IMkvReader* pReader, long long pos, long long size) {

-  const long long stop = pos + size;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)

-      return status;

-    if (size == 0)  // 0 length tag, read another

-      continue;

-    if (id == mkvmuxer::kMkvSimpleTag) {

-      status = ParseSimpleTag(pReader, pos, size);

-      if (status < 0)

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long Tags::Tag::ParseSimpleTag(IMkvReader* pReader, long long pos,

-                               long long size) {

-  if (!ExpandSimpleTagsArray())

-    return -1;

-  SimpleTag& st = m_simple_tags[m_simple_tags_count++];

-  st.Init();

-  return st.Parse(pReader, pos, size);

-}

-bool Tags::Tag::ExpandSimpleTagsArray() {

-  if (m_simple_tags_size > m_simple_tags_count)

-    return true;  // nothing else to do

-  const int size = (m_simple_tags_size == 0) ? 1 : 2 * m_simple_tags_size;

-  SimpleTag* const displays = new (std::nothrow) SimpleTag[size];

-  if (displays == NULL)

-    return false;

-  for (int idx = 0; idx < m_simple_tags_count; ++idx) {

-    m_simple_tags[idx].ShallowCopy(displays[idx]);

-  }

-  delete[] m_simple_tags;

-  m_simple_tags = displays;

-  m_simple_tags_size = size;

-  return true;

-}

-Tags::SimpleTag::SimpleTag() {}

-Tags::SimpleTag::~SimpleTag() {}

-const char* Tags::SimpleTag::GetTagName() const { return m_tag_name; }

-const char* Tags::SimpleTag::GetTagString() const { return m_tag_string; }

-void Tags::SimpleTag::Init() {

-  m_tag_name = NULL;

-  m_tag_string = NULL;

-}

-void Tags::SimpleTag::ShallowCopy(SimpleTag& rhs) const {

-  rhs.m_tag_name = m_tag_name;

-  rhs.m_tag_string = m_tag_string;

-}

-void Tags::SimpleTag::Clear() {

-  delete[] m_tag_name;

-  m_tag_name = NULL;

-  delete[] m_tag_string;

-  m_tag_string = NULL;

-}

-long Tags::SimpleTag::Parse(IMkvReader* pReader, long long pos,

-                            long long size) {

-  const long long stop = pos + size;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)  // weird

-      continue;

-    if (id == mkvmuxer::kMkvTagName) {

-      status = UnserializeString(pReader, pos, size, m_tag_name);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvTagString) {

-      status = UnserializeString(pReader, pos, size, m_tag_string);

-      if (status)

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-SegmentInfo::SegmentInfo(Segment* pSegment, long long start, long long size_,

-                         long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_start(start),

-      m_size(size_),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_pMuxingAppAsUTF8(NULL),

-      m_pWritingAppAsUTF8(NULL),

-      m_pTitleAsUTF8(NULL) {}

-SegmentInfo::~SegmentInfo() {

-  delete[] m_pMuxingAppAsUTF8;

-  m_pMuxingAppAsUTF8 = NULL;

-  delete[] m_pWritingAppAsUTF8;

-  m_pWritingAppAsUTF8 = NULL;

-  delete[] m_pTitleAsUTF8;

-  m_pTitleAsUTF8 = NULL;

-}

-long SegmentInfo::Parse() {

-  assert(m_pMuxingAppAsUTF8 == NULL);

-  assert(m_pWritingAppAsUTF8 == NULL);

-  assert(m_pTitleAsUTF8 == NULL);

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = m_start;

-  const long long stop = m_start + m_size;

-  m_timecodeScale = 1000000;

-  m_duration = -1;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvTimecodeScale) {

-      m_timecodeScale = UnserializeUInt(pReader, pos, size);

-      if (m_timecodeScale <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDuration) {

-      const long status = UnserializeFloat(pReader, pos, size, m_duration);

-      if (status < 0)

-        return status;

-      if (m_duration < 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvMuxingApp) {

-      const long status =

-          UnserializeString(pReader, pos, size, m_pMuxingAppAsUTF8);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvWritingApp) {

-      const long status =

-          UnserializeString(pReader, pos, size, m_pWritingAppAsUTF8);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvTitle) {

-      const long status = UnserializeString(pReader, pos, size, m_pTitleAsUTF8);

-      if (status)

-        return status;

-    }

-    pos += size;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  const double rollover_check = m_duration * m_timecodeScale;

-  if (rollover_check > LLONG_MAX)

-    return E_FILE_FORMAT_INVALID;

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long long SegmentInfo::GetTimeCodeScale() const { return m_timecodeScale; }

-long long SegmentInfo::GetDuration() const {

-  if (m_duration < 0)

-    return -1;

-  assert(m_timecodeScale >= 1);

-  const double dd = double(m_duration) * double(m_timecodeScale);

-  const long long d = static_cast<long long>(dd);

-  return d;

-}

-const char* SegmentInfo::GetMuxingAppAsUTF8() const {

-  return m_pMuxingAppAsUTF8;

-}

-const char* SegmentInfo::GetWritingAppAsUTF8() const {

-  return m_pWritingAppAsUTF8;

-}

-const char* SegmentInfo::GetTitleAsUTF8() const { return m_pTitleAsUTF8; }

-///////////////////////////////////////////////////////////////

-// ContentEncoding element

-ContentEncoding::ContentCompression::ContentCompression()

-    : algo(0), settings(NULL), settings_len(0) {}

-ContentEncoding::ContentCompression::~ContentCompression() {

-  delete[] settings;

-}

-ContentEncoding::ContentEncryption::ContentEncryption()

-    : algo(0),

-      key_id(NULL),

-      key_id_len(0),

-      signature(NULL),

-      signature_len(0),

-      sig_key_id(NULL),

-      sig_key_id_len(0),

-      sig_algo(0),

-      sig_hash_algo(0) {}

-ContentEncoding::ContentEncryption::~ContentEncryption() {

-  delete[] key_id;

-  delete[] signature;

-  delete[] sig_key_id;

-}

-ContentEncoding::ContentEncoding()

-    : compression_entries_(NULL),

-      compression_entries_end_(NULL),

-      encryption_entries_(NULL),

-      encryption_entries_end_(NULL),

-      encoding_order_(0),

-      encoding_scope_(1),

-      encoding_type_(0) {}

-ContentEncoding::~ContentEncoding() {

-  ContentCompression** comp_i = compression_entries_;

-  ContentCompression** const comp_j = compression_entries_end_;

-  while (comp_i != comp_j) {

-    ContentCompression* const comp = *comp_i++;

-    delete comp;

-  }

-  delete[] compression_entries_;

-  ContentEncryption** enc_i = encryption_entries_;

-  ContentEncryption** const enc_j = encryption_entries_end_;

-  while (enc_i != enc_j) {

-    ContentEncryption* const enc = *enc_i++;

-    delete enc;

-  }

-  delete[] encryption_entries_;

-}

-const ContentEncoding::ContentCompression*

-    ContentEncoding::GetCompressionByIndex(unsigned long idx) const {

-  const ptrdiff_t count = compression_entries_end_ - compression_entries_;

-  assert(count >= 0);

-  if (idx >= static_cast<unsigned long>(count))

-    return NULL;

-  return compression_entries_[idx];

-}

-unsigned long ContentEncoding::GetCompressionCount() const {

-  const ptrdiff_t count = compression_entries_end_ - compression_entries_;

-  assert(count >= 0);

-  return static_cast<unsigned long>(count);

-}

-const ContentEncoding::ContentEncryption* ContentEncoding::GetEncryptionByIndex(

-    unsigned long idx) const {

-  const ptrdiff_t count = encryption_entries_end_ - encryption_entries_;

-  assert(count >= 0);

-  if (idx >= static_cast<unsigned long>(count))

-    return NULL;

-  return encryption_entries_[idx];

-}

-unsigned long ContentEncoding::GetEncryptionCount() const {

-  const ptrdiff_t count = encryption_entries_end_ - encryption_entries_;

-  assert(count >= 0);

-  return static_cast<unsigned long>(count);

-}

-long ContentEncoding::ParseContentEncAESSettingsEntry(

-    long long start, long long size, IMkvReader* pReader,

-    ContentEncAESSettings* aes) {

-  assert(pReader);

-  assert(aes);

-  long long pos = start;

-  const long long stop = start + size;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvAESSettingsCipherMode) {

-      aes->cipher_mode = UnserializeUInt(pReader, pos, size);

-      if (aes->cipher_mode != 1)

-        return E_FILE_FORMAT_INVALID;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  return 0;

-}

-long ContentEncoding::ParseContentEncodingEntry(long long start, long long size,

-                                                IMkvReader* pReader) {

-  assert(pReader);

-  long long pos = start;

-  const long long stop = start + size;

-  // Count ContentCompression and ContentEncryption elements.

-  int compression_count = 0;

-  int encryption_count = 0;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvContentCompression)

-      ++compression_count;

-    if (id == mkvmuxer::kMkvContentEncryption)

-      ++encryption_count;

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (compression_count <= 0 && encryption_count <= 0)

-    return -1;

-  if (compression_count > 0) {

-    compression_entries_ =

-        new (std::nothrow) ContentCompression*[compression_count];

-    if (!compression_entries_)

-      return -1;

-    compression_entries_end_ = compression_entries_;

-  }

-  if (encryption_count > 0) {

-    encryption_entries_ =

-        new (std::nothrow) ContentEncryption*[encryption_count];

-    if (!encryption_entries_) {

-      delete[] compression_entries_;

-      return -1;

-    }

-    encryption_entries_end_ = encryption_entries_;

-  }

-  pos = start;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvContentEncodingOrder) {

-      encoding_order_ = UnserializeUInt(pReader, pos, size);

-    } else if (id == mkvmuxer::kMkvContentEncodingScope) {

-      encoding_scope_ = UnserializeUInt(pReader, pos, size);

-      if (encoding_scope_ < 1)

-        return -1;

-    } else if (id == mkvmuxer::kMkvContentEncodingType) {

-      encoding_type_ = UnserializeUInt(pReader, pos, size);

-    } else if (id == mkvmuxer::kMkvContentCompression) {

-      ContentCompression* const compression =

-          new (std::nothrow) ContentCompression();

-      if (!compression)

-        return -1;

-      status = ParseCompressionEntry(pos, size, pReader, compression);

-      if (status) {

-        delete compression;

-        return status;

-      }

-      *compression_entries_end_++ = compression;

-    } else if (id == mkvmuxer::kMkvContentEncryption) {

-      ContentEncryption* const encryption =

-          new (std::nothrow) ContentEncryption();

-      if (!encryption)

-        return -1;

-      status = ParseEncryptionEntry(pos, size, pReader, encryption);

-      if (status) {

-        delete encryption;

-        return status;

-      }

-      *encryption_entries_end_++ = encryption;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long ContentEncoding::ParseCompressionEntry(long long start, long long size,

-                                            IMkvReader* pReader,

-                                            ContentCompression* compression) {

-  assert(pReader);

-  assert(compression);

-  long long pos = start;

-  const long long stop = start + size;

-  bool valid = false;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvContentCompAlgo) {

-      long long algo = UnserializeUInt(pReader, pos, size);

-      if (algo < 0)

-        return E_FILE_FORMAT_INVALID;

-      compression->algo = algo;

-      valid = true;

-    } else if (id == mkvmuxer::kMkvContentCompSettings) {

-      if (size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      const size_t buflen = static_cast<size_t>(size);

-      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

-      if (buf == NULL)

-        return -1;

-      const int read_status =

-          pReader->Read(pos, static_cast<long>(buflen), buf);

-      if (read_status) {

-        delete[] buf;

-        return status;

-      }

-      compression->settings = buf;

-      compression->settings_len = buflen;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  // ContentCompAlgo is mandatory

-  if (!valid)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-long ContentEncoding::ParseEncryptionEntry(long long start, long long size,

-                                           IMkvReader* pReader,

-                                           ContentEncryption* encryption) {

-  assert(pReader);

-  assert(encryption);

-  long long pos = start;

-  const long long stop = start + size;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvContentEncAlgo) {

-      encryption->algo = UnserializeUInt(pReader, pos, size);

-      if (encryption->algo != 5)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvContentEncKeyID) {

-      delete[] encryption->key_id;

-      encryption->key_id = NULL;

-      encryption->key_id_len = 0;

-      if (size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      const size_t buflen = static_cast<size_t>(size);

-      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

-      if (buf == NULL)

-        return -1;

-      const int read_status =

-          pReader->Read(pos, static_cast<long>(buflen), buf);

-      if (read_status) {

-        delete[] buf;

-        return status;

-      }

-      encryption->key_id = buf;

-      encryption->key_id_len = buflen;

-    } else if (id == mkvmuxer::kMkvContentSignature) {

-      delete[] encryption->signature;

-      encryption->signature = NULL;

-      encryption->signature_len = 0;

-      if (size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      const size_t buflen = static_cast<size_t>(size);

-      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

-      if (buf == NULL)

-        return -1;

-      const int read_status =

-          pReader->Read(pos, static_cast<long>(buflen), buf);

-      if (read_status) {

-        delete[] buf;

-        return status;

-      }

-      encryption->signature = buf;

-      encryption->signature_len = buflen;

-    } else if (id == mkvmuxer::kMkvContentSigKeyID) {

-      delete[] encryption->sig_key_id;

-      encryption->sig_key_id = NULL;

-      encryption->sig_key_id_len = 0;

-      if (size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      const size_t buflen = static_cast<size_t>(size);

-      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

-      if (buf == NULL)

-        return -1;

-      const int read_status =

-          pReader->Read(pos, static_cast<long>(buflen), buf);

-      if (read_status) {

-        delete[] buf;

-        return status;

-      }

-      encryption->sig_key_id = buf;

-      encryption->sig_key_id_len = buflen;

-    } else if (id == mkvmuxer::kMkvContentSigAlgo) {

-      encryption->sig_algo = UnserializeUInt(pReader, pos, size);

-    } else if (id == mkvmuxer::kMkvContentSigHashAlgo) {

-      encryption->sig_hash_algo = UnserializeUInt(pReader, pos, size);

-    } else if (id == mkvmuxer::kMkvContentEncAESSettings) {

-      const long status = ParseContentEncAESSettingsEntry(

-          pos, size, pReader, &encryption->aes_settings);

-      if (status)

-        return status;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  return 0;

-}

-Track::Track(Segment* pSegment, long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      content_encoding_entries_(NULL),

-      content_encoding_entries_end_(NULL) {}

-Track::~Track() {

-  Info& info = const_cast<Info&>(m_info);

-  info.Clear();

-  ContentEncoding** i = content_encoding_entries_;

-  ContentEncoding** const j = content_encoding_entries_end_;

-  while (i != j) {

-    ContentEncoding* const encoding = *i++;

-    delete encoding;

-  }

-  delete[] content_encoding_entries_;

-}

-long Track::Create(Segment* pSegment, const Info& info, long long element_start,

-                   long long element_size, Track*& pResult) {

-  if (pResult)

-    return -1;

-  Track* const pTrack =

-      new (std::nothrow) Track(pSegment, element_start, element_size);

-  if (pTrack == NULL)

-    return -1;  // generic error

-  const int status = info.Copy(pTrack->m_info);

-  if (status) {  // error

-    delete pTrack;

-    return status;

-  }

-  pResult = pTrack;

-  return 0;  // success

-}

-Track::Info::Info()

-    : uid(0),

-      defaultDuration(0),

-      codecDelay(0),

-      seekPreRoll(0),

-      nameAsUTF8(NULL),

-      language(NULL),

-      codecId(NULL),

-      codecNameAsUTF8(NULL),

-      codecPrivate(NULL),

-      codecPrivateSize(0),

-      lacing(false) {}

-Track::Info::~Info() { Clear(); }

-void Track::Info::Clear() {

-  delete[] nameAsUTF8;

-  nameAsUTF8 = NULL;

-  delete[] language;

-  language = NULL;

-  delete[] codecId;

-  codecId = NULL;

-  delete[] codecPrivate;

-  codecPrivate = NULL;

-  codecPrivateSize = 0;

-  delete[] codecNameAsUTF8;

-  codecNameAsUTF8 = NULL;

-}

-int Track::Info::CopyStr(char* Info::*str, Info& dst_) const {

-  if (str == static_cast<char * Info::*>(NULL))

-    return -1;

-  char*& dst = dst_.*str;

-  if (dst)  // should be NULL already

-    return -1;

-  const char* const src = this->*str;

-  if (src == NULL)

-    return 0;

-  const size_t len = strlen(src);

-  dst = SafeArrayAlloc<char>(1, len + 1);

-  if (dst == NULL)

-    return -1;

-  strcpy(dst, src);

-  return 0;

-}

-int Track::Info::Copy(Info& dst) const {

-  if (&dst == this)

-    return 0;

-  dst.type = type;

-  dst.number = number;

-  dst.defaultDuration = defaultDuration;

-  dst.codecDelay = codecDelay;

-  dst.seekPreRoll = seekPreRoll;

-  dst.uid = uid;

-  dst.lacing = lacing;

-  dst.settings = settings;

-  // We now copy the string member variables from src to dst.

-  // This involves memory allocation so in principle the operation

-  // can fail (indeed, that's why we have Info::Copy), so we must

-  // report this to the caller.  An error return from this function

-  // therefore implies that the copy was only partially successful.

-  if (int status = CopyStr(&Info::nameAsUTF8, dst))

-    return status;

-  if (int status = CopyStr(&Info::language, dst))

-    return status;

-  if (int status = CopyStr(&Info::codecId, dst))

-    return status;

-  if (int status = CopyStr(&Info::codecNameAsUTF8, dst))

-    return status;

-  if (codecPrivateSize > 0) {

-    if (codecPrivate == NULL)

-      return -1;

-    if (dst.codecPrivate)

-      return -1;

-    if (dst.codecPrivateSize != 0)

-      return -1;

-    dst.codecPrivate = SafeArrayAlloc<unsigned char>(1, codecPrivateSize);

-    if (dst.codecPrivate == NULL)

-      return -1;

-    memcpy(dst.codecPrivate, codecPrivate, codecPrivateSize);

-    dst.codecPrivateSize = codecPrivateSize;

-  }

-  return 0;

-}

-const BlockEntry* Track::GetEOS() const { return &m_eos; }

-long Track::GetType() const { return m_info.type; }

-long Track::GetNumber() const { return m_info.number; }

-unsigned long long Track::GetUid() const { return m_info.uid; }

-const char* Track::GetNameAsUTF8() const { return m_info.nameAsUTF8; }

-const char* Track::GetLanguage() const { return m_info.language; }

-const char* Track::GetCodecNameAsUTF8() const { return m_info.codecNameAsUTF8; }

-const char* Track::GetCodecId() const { return m_info.codecId; }

-const unsigned char* Track::GetCodecPrivate(size_t& size) const {

-  size = m_info.codecPrivateSize;

-  return m_info.codecPrivate;

-}

-bool Track::GetLacing() const { return m_info.lacing; }

-unsigned long long Track::GetDefaultDuration() const {

-  return m_info.defaultDuration;

-}

-unsigned long long Track::GetCodecDelay() const { return m_info.codecDelay; }

-unsigned long long Track::GetSeekPreRoll() const { return m_info.seekPreRoll; }

-long Track::GetFirst(const BlockEntry*& pBlockEntry) const {

-  const Cluster* pCluster = m_pSegment->GetFirst();

-  for (int i = 0;;) {

-    if (pCluster == NULL) {

-      pBlockEntry = GetEOS();

-      return 1;

-    }

-    if (pCluster->EOS()) {

-      if (m_pSegment->DoneParsing()) {

-        pBlockEntry = GetEOS();

-        return 1;

-      }

-      pBlockEntry = 0;

-      return E_BUFFER_NOT_FULL;

-    }

-    long status = pCluster->GetFirst(pBlockEntry);

-    if (status < 0)  // error

-      return status;

-    if (pBlockEntry == 0) {  // empty cluster

-      pCluster = m_pSegment->GetNext(pCluster);

-      continue;

-    }

-    for (;;) {

-      const Block* const pBlock = pBlockEntry->GetBlock();

-      assert(pBlock);

-      const long long tn = pBlock->GetTrackNumber();

-      if ((tn == m_info.number) && VetEntry(pBlockEntry))

-        return 0;

-      const BlockEntry* pNextEntry;

-      status = pCluster->GetNext(pBlockEntry, pNextEntry);

-      if (status < 0)  // error

-        return status;

-      if (pNextEntry == 0)

-        break;

-      pBlockEntry = pNextEntry;

-    }

-    ++i;

-    if (i >= 100)

-      break;

-    pCluster = m_pSegment->GetNext(pCluster);

-  }

-  // NOTE: if we get here, it means that we didn't find a block with

-  // a matching track number.  We interpret that as an error (which

-  // might be too conservative).

-  pBlockEntry = GetEOS();  // so we can return a non-NULL value

-  return 1;

-}

-long Track::GetNext(const BlockEntry* pCurrEntry,

-                    const BlockEntry*& pNextEntry) const {

-  assert(pCurrEntry);

-  assert(!pCurrEntry->EOS());  //?

-  const Block* const pCurrBlock = pCurrEntry->GetBlock();

-  assert(pCurrBlock && pCurrBlock->GetTrackNumber() == m_info.number);

-  if (!pCurrBlock || pCurrBlock->GetTrackNumber() != m_info.number)

-    return -1;

-  const Cluster* pCluster = pCurrEntry->GetCluster();

-  assert(pCluster);

-  assert(!pCluster->EOS());

-  long status = pCluster->GetNext(pCurrEntry, pNextEntry);

-  if (status < 0)  // error

-    return status;

-  for (int i = 0;;) {

-    while (pNextEntry) {

-      const Block* const pNextBlock = pNextEntry->GetBlock();

-      assert(pNextBlock);

-      if (pNextBlock->GetTrackNumber() == m_info.number)

-        return 0;

-      pCurrEntry = pNextEntry;

-      status = pCluster->GetNext(pCurrEntry, pNextEntry);

-      if (status < 0)  // error

-        return status;

-    }

-    pCluster = m_pSegment->GetNext(pCluster);

-    if (pCluster == NULL) {

-      pNextEntry = GetEOS();

-      return 1;

-    }

-    if (pCluster->EOS()) {

-      if (m_pSegment->DoneParsing()) {

-        pNextEntry = GetEOS();

-        return 1;

-      }

-      // TODO: there is a potential O(n^2) problem here: we tell the

-      // caller to (pre)load another cluster, which he does, but then he

-      // calls GetNext again, which repeats the same search.  This is

-      // a pathological case, since the only way it can happen is if

-      // there exists a long sequence of clusters none of which contain a

-      // block from this track.  One way around this problem is for the

-      // caller to be smarter when he loads another cluster: don't call

-      // us back until you have a cluster that contains a block from this

-      // track. (Of course, that's not cheap either, since our caller

-      // would have to scan the each cluster as it's loaded, so that

-      // would just push back the problem.)

-      pNextEntry = NULL;

-      return E_BUFFER_NOT_FULL;

-    }

-    status = pCluster->GetFirst(pNextEntry);

-    if (status < 0)  // error

-      return status;

-    if (pNextEntry == NULL)  // empty cluster

-      continue;

-    ++i;

-    if (i >= 100)

-      break;

-  }

-  // NOTE: if we get here, it means that we didn't find a block with

-  // a matching track number after lots of searching, so we give

-  // up trying.

-  pNextEntry = GetEOS();  // so we can return a non-NULL value

-  return 1;

-}

-bool Track::VetEntry(const BlockEntry* pBlockEntry) const {

-  assert(pBlockEntry);

-  const Block* const pBlock = pBlockEntry->GetBlock();

-  assert(pBlock);

-  assert(pBlock->GetTrackNumber() == m_info.number);

-  if (!pBlock || pBlock->GetTrackNumber() != m_info.number)

-    return false;

-  // This function is used during a seek to determine whether the

-  // frame is a valid seek target.  This default function simply

-  // returns true, which means all frames are valid seek targets.

-  // It gets overridden by the VideoTrack class, because only video

-  // keyframes can be used as seek target.

-  return true;

-}

-long Track::Seek(long long time_ns, const BlockEntry*& pResult) const {

-  const long status = GetFirst(pResult);

-  if (status < 0)  // buffer underflow, etc

-    return status;

-  assert(pResult);

-  if (pResult->EOS())

-    return 0;

-  const Cluster* pCluster = pResult->GetCluster();

-  assert(pCluster);

-  assert(pCluster->GetIndex() >= 0);

-  if (time_ns <= pResult->GetBlock()->GetTime(pCluster))

-    return 0;

-  Cluster** const clusters = m_pSegment->m_clusters;

-  assert(clusters);

-  const long count = m_pSegment->GetCount();  // loaded only, not preloaded

-  assert(count > 0);

-  Cluster** const i = clusters + pCluster->GetIndex();

-  assert(i);

-  assert(*i == pCluster);

-  assert(pCluster->GetTime() <= time_ns);

-  Cluster** const j = clusters + count;

-  Cluster** lo = i;

-  Cluster** hi = j;

-  while (lo < hi) {

-    // INVARIANT:

-    //[i, lo) <= time_ns

-    //[lo, hi) ?

-    //[hi, j)  > time_ns

-    Cluster** const mid = lo + (hi - lo) / 2;

-    assert(mid < hi);

-    pCluster = *mid;

-    assert(pCluster);

-    assert(pCluster->GetIndex() >= 0);

-    assert(pCluster->GetIndex() == long(mid - m_pSegment->m_clusters));

-    const long long t = pCluster->GetTime();

-    if (t <= time_ns)

-      lo = mid + 1;

-    else

-      hi = mid;

-    assert(lo <= hi);

-  }

-  assert(lo == hi);

-  assert(lo > i);

-  assert(lo <= j);

-  while (lo > i) {

-    pCluster = *--lo;

-    assert(pCluster);

-    assert(pCluster->GetTime() <= time_ns);

-    pResult = pCluster->GetEntry(this);

-    if ((pResult != 0) && !pResult->EOS())

-      return 0;

-    // landed on empty cluster (no entries)

-  }

-  pResult = GetEOS();  // weird

-  return 0;

-}

-const ContentEncoding* Track::GetContentEncodingByIndex(

-    unsigned long idx) const {

-  const ptrdiff_t count =

-      content_encoding_entries_end_ - content_encoding_entries_;

-  assert(count >= 0);

-  if (idx >= static_cast<unsigned long>(count))

-    return NULL;

-  return content_encoding_entries_[idx];

-}

-unsigned long Track::GetContentEncodingCount() const {

-  const ptrdiff_t count =

-      content_encoding_entries_end_ - content_encoding_entries_;

-  assert(count >= 0);

-  return static_cast<unsigned long>(count);

-}

-long Track::ParseContentEncodingsEntry(long long start, long long size) {

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  assert(pReader);

-  long long pos = start;

-  const long long stop = start + size;

-  // Count ContentEncoding elements.

-  int count = 0;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    // pos now designates start of element

-    if (id == mkvmuxer::kMkvContentEncoding)

-      ++count;

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (count <= 0)

-    return -1;

-  content_encoding_entries_ = new (std::nothrow) ContentEncoding*[count];

-  if (!content_encoding_entries_)

-    return -1;

-  content_encoding_entries_end_ = content_encoding_entries_;

-  pos = start;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    // pos now designates start of element

-    if (id == mkvmuxer::kMkvContentEncoding) {

-      ContentEncoding* const content_encoding =

-          new (std::nothrow) ContentEncoding();

-      if (!content_encoding)

-        return -1;

-      status = content_encoding->ParseContentEncodingEntry(pos, size, pReader);

-      if (status) {

-        delete content_encoding;

-        return status;

-      }

-      *content_encoding_entries_end_++ = content_encoding;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;

-}

-Track::EOSBlock::EOSBlock() : BlockEntry(NULL, LONG_MIN) {}

-BlockEntry::Kind Track::EOSBlock::GetKind() const { return kBlockEOS; }

-const Block* Track::EOSBlock::GetBlock() const { return NULL; }

-VideoTrack::VideoTrack(Segment* pSegment, long long element_start,

-                       long long element_size)

-    : Track(pSegment, element_start, element_size) {}

-long VideoTrack::Parse(Segment* pSegment, const Info& info,

-                       long long element_start, long long element_size,

-                       VideoTrack*& pResult) {

-  if (pResult)

-    return -1;

-  if (info.type != Track::kVideo)

-    return -1;

-  long long width = 0;

-  long long height = 0;

-  long long display_width = 0;

-  long long display_height = 0;

-  long long display_unit = 0;

-  long long stereo_mode = 0;

-  double rate = 0.0;

-  IMkvReader* const pReader = pSegment->m_pReader;

-  const Settings& s = info.settings;

-  assert(s.start >= 0);

-  assert(s.size >= 0);

-  long long pos = s.start;

-  assert(pos >= 0);

-  const long long stop = pos + s.size;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvPixelWidth) {

-      width = UnserializeUInt(pReader, pos, size);

-      if (width <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvPixelHeight) {

-      height = UnserializeUInt(pReader, pos, size);

-      if (height <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDisplayWidth) {

-      display_width = UnserializeUInt(pReader, pos, size);

-      if (display_width <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDisplayHeight) {

-      display_height = UnserializeUInt(pReader, pos, size);

-      if (display_height <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvDisplayUnit) {

-      display_unit = UnserializeUInt(pReader, pos, size);

-      if (display_unit < 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvStereoMode) {

-      stereo_mode = UnserializeUInt(pReader, pos, size);

-      if (stereo_mode < 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvFrameRate) {

-      const long status = UnserializeFloat(pReader, pos, size, rate);

-      if (status < 0)

-        return status;

-      if (rate <= 0)

-        return E_FILE_FORMAT_INVALID;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  VideoTrack* const pTrack =

-      new (std::nothrow) VideoTrack(pSegment, element_start, element_size);

-  if (pTrack == NULL)

-    return -1;  // generic error

-  const int status = info.Copy(pTrack->m_info);

-  if (status) {  // error

-    delete pTrack;

-    return status;

-  }

-  pTrack->m_width = width;

-  pTrack->m_height = height;

-  pTrack->m_display_width = display_width;

-  pTrack->m_display_height = display_height;

-  pTrack->m_display_unit = display_unit;

-  pTrack->m_stereo_mode = stereo_mode;

-  pTrack->m_rate = rate;

-  pResult = pTrack;

-  return 0;  // success

-}

-bool VideoTrack::VetEntry(const BlockEntry* pBlockEntry) const {

-  return Track::VetEntry(pBlockEntry) && pBlockEntry->GetBlock()->IsKey();

-}

-long VideoTrack::Seek(long long time_ns, const BlockEntry*& pResult) const {

-  const long status = GetFirst(pResult);

-  if (status < 0)  // buffer underflow, etc

-    return status;

-  assert(pResult);

-  if (pResult->EOS())

-    return 0;

-  const Cluster* pCluster = pResult->GetCluster();

-  assert(pCluster);

-  assert(pCluster->GetIndex() >= 0);

-  if (time_ns <= pResult->GetBlock()->GetTime(pCluster))

-    return 0;

-  Cluster** const clusters = m_pSegment->m_clusters;

-  assert(clusters);

-  const long count = m_pSegment->GetCount();  // loaded only, not pre-loaded

-  assert(count > 0);

-  Cluster** const i = clusters + pCluster->GetIndex();

-  assert(i);

-  assert(*i == pCluster);

-  assert(pCluster->GetTime() <= time_ns);

-  Cluster** const j = clusters + count;

-  Cluster** lo = i;

-  Cluster** hi = j;

-  while (lo < hi) {

-    // INVARIANT:

-    //[i, lo) <= time_ns

-    //[lo, hi) ?

-    //[hi, j)  > time_ns

-    Cluster** const mid = lo + (hi - lo) / 2;

-    assert(mid < hi);

-    pCluster = *mid;

-    assert(pCluster);

-    assert(pCluster->GetIndex() >= 0);

-    assert(pCluster->GetIndex() == long(mid - m_pSegment->m_clusters));

-    const long long t = pCluster->GetTime();

-    if (t <= time_ns)

-      lo = mid + 1;

-    else

-      hi = mid;

-    assert(lo <= hi);

-  }

-  assert(lo == hi);

-  assert(lo > i);

-  assert(lo <= j);

-  pCluster = *--lo;

-  assert(pCluster);

-  assert(pCluster->GetTime() <= time_ns);

-  pResult = pCluster->GetEntry(this, time_ns);

-  if ((pResult != 0) && !pResult->EOS())  // found a keyframe

-    return 0;

-  while (lo != i) {

-    pCluster = *--lo;

-    assert(pCluster);

-    assert(pCluster->GetTime() <= time_ns);

-    pResult = pCluster->GetEntry(this, time_ns);

-    if ((pResult != 0) && !pResult->EOS())

-      return 0;

-  }

-  // weird: we're on the first cluster, but no keyframe found

-  // should never happen but we must return something anyway

-  pResult = GetEOS();

-  return 0;

-}

-long long VideoTrack::GetWidth() const { return m_width; }

-long long VideoTrack::GetHeight() const { return m_height; }

-long long VideoTrack::GetDisplayWidth() const {

-  return m_display_width > 0 ? m_display_width : GetWidth();

-}

-long long VideoTrack::GetDisplayHeight() const {

-  return m_display_height > 0 ? m_display_height : GetHeight();

-}

-long long VideoTrack::GetDisplayUnit() const { return m_display_unit; }

-long long VideoTrack::GetStereoMode() const { return m_stereo_mode; }

-double VideoTrack::GetFrameRate() const { return m_rate; }

-AudioTrack::AudioTrack(Segment* pSegment, long long element_start,

-                       long long element_size)

-    : Track(pSegment, element_start, element_size) {}

-long AudioTrack::Parse(Segment* pSegment, const Info& info,

-                       long long element_start, long long element_size,

-                       AudioTrack*& pResult) {

-  if (pResult)

-    return -1;

-  if (info.type != Track::kAudio)

-    return -1;

-  IMkvReader* const pReader = pSegment->m_pReader;

-  const Settings& s = info.settings;

-  assert(s.start >= 0);

-  assert(s.size >= 0);

-  long long pos = s.start;

-  assert(pos >= 0);

-  const long long stop = pos + s.size;

-  double rate = 8000.0;  // MKV default

-  long long channels = 1;

-  long long bit_depth = 0;

-  while (pos < stop) {

-    long long id, size;

-    long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (id == mkvmuxer::kMkvSamplingFrequency) {

-      status = UnserializeFloat(pReader, pos, size, rate);

-      if (status < 0)

-        return status;

-      if (rate <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvChannels) {

-      channels = UnserializeUInt(pReader, pos, size);

-      if (channels <= 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvBitDepth) {

-      bit_depth = UnserializeUInt(pReader, pos, size);

-      if (bit_depth <= 0)

-        return E_FILE_FORMAT_INVALID;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  AudioTrack* const pTrack =

-      new (std::nothrow) AudioTrack(pSegment, element_start, element_size);

-  if (pTrack == NULL)

-    return -1;  // generic error

-  const int status = info.Copy(pTrack->m_info);

-  if (status) {

-    delete pTrack;

-    return status;

-  }

-  pTrack->m_rate = rate;

-  pTrack->m_channels = channels;

-  pTrack->m_bitDepth = bit_depth;

-  pResult = pTrack;

-  return 0;  // success

-}

-double AudioTrack::GetSamplingRate() const { return m_rate; }

-long long AudioTrack::GetChannels() const { return m_channels; }

-long long AudioTrack::GetBitDepth() const { return m_bitDepth; }

-Tracks::Tracks(Segment* pSegment, long long start, long long size_,

-               long long element_start, long long element_size)

-    : m_pSegment(pSegment),

-      m_start(start),

-      m_size(size_),

-      m_element_start(element_start),

-      m_element_size(element_size),

-      m_trackEntries(NULL),

-      m_trackEntriesEnd(NULL) {}

-long Tracks::Parse() {

-  assert(m_trackEntries == NULL);

-  assert(m_trackEntriesEnd == NULL);

-  const long long stop = m_start + m_size;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  int count = 0;

-  long long pos = m_start;

-  while (pos < stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size == 0)  // weird

-      continue;

-    if (id == mkvmuxer::kMkvTrackEntry)

-      ++count;

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  if (count <= 0)

-    return 0;  // success

-  m_trackEntries = new (std::nothrow) Track*[count];

-  if (m_trackEntries == NULL)

-    return -1;

-  m_trackEntriesEnd = m_trackEntries;

-  pos = m_start;

-  while (pos < stop) {

-    const long long element_start = pos;

-    long long id, payload_size;

-    const long status =

-        ParseElementHeader(pReader, pos, stop, id, payload_size);

-    if (status < 0)  // error

-      return status;

-    if (payload_size == 0)  // weird

-      continue;

-    const long long payload_stop = pos + payload_size;

-    assert(payload_stop <= stop);  // checked in ParseElement

-    const long long element_size = payload_stop - element_start;

-    if (id == mkvmuxer::kMkvTrackEntry) {

-      Track*& pTrack = *m_trackEntriesEnd;

-      pTrack = NULL;

-      const long status = ParseTrackEntry(pos, payload_size, element_start,

-                                          element_size, pTrack);

-      if (status)

-        return status;

-      if (pTrack)

-        ++m_trackEntriesEnd;

-    }

-    pos = payload_stop;

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  return 0;  // success

-}

-unsigned long Tracks::GetTracksCount() const {

-  const ptrdiff_t result = m_trackEntriesEnd - m_trackEntries;

-  assert(result >= 0);

-  return static_cast<unsigned long>(result);

-}

-long Tracks::ParseTrackEntry(long long track_start, long long track_size,

-                             long long element_start, long long element_size,

-                             Track*& pResult) const {

-  if (pResult)

-    return -1;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = track_start;

-  const long long track_stop = track_start + track_size;

-  Track::Info info;

-  info.type = 0;

-  info.number = 0;

-  info.uid = 0;

-  info.defaultDuration = 0;

-  Track::Settings v;

-  v.start = -1;

-  v.size = -1;

-  Track::Settings a;

-  a.start = -1;

-  a.size = -1;

-  Track::Settings e;  // content_encodings_settings;

-  e.start = -1;

-  e.size = -1;

-  long long lacing = 1;  // default is true

-  while (pos < track_stop) {

-    long long id, size;

-    const long status = ParseElementHeader(pReader, pos, track_stop, id, size);

-    if (status < 0)  // error

-      return status;

-    if (size < 0)

-      return E_FILE_FORMAT_INVALID;

-    const long long start = pos;

-    if (id == mkvmuxer::kMkvVideo) {

-      v.start = start;

-      v.size = size;

-    } else if (id == mkvmuxer::kMkvAudio) {

-      a.start = start;

-      a.size = size;

-    } else if (id == mkvmuxer::kMkvContentEncodings) {

-      e.start = start;

-      e.size = size;

-    } else if (id == mkvmuxer::kMkvTrackUID) {

-      if (size > 8)

-        return E_FILE_FORMAT_INVALID;

-      info.uid = 0;

-      long long pos_ = start;

-      const long long pos_end = start + size;

-      while (pos_ != pos_end) {

-        unsigned char b;

-        const int status = pReader->Read(pos_, 1, &b);

-        if (status)

-          return status;

-        info.uid <<= 8;

-        info.uid |= b;

-        ++pos_;

-      }

-    } else if (id == mkvmuxer::kMkvTrackNumber) {

-      const long long num = UnserializeUInt(pReader, pos, size);

-      if ((num <= 0) || (num > 127))

-        return E_FILE_FORMAT_INVALID;

-      info.number = static_cast<long>(num);

-    } else if (id == mkvmuxer::kMkvTrackType) {

-      const long long type = UnserializeUInt(pReader, pos, size);

-      if ((type <= 0) || (type > 254))

-        return E_FILE_FORMAT_INVALID;

-      info.type = static_cast<long>(type);

-    } else if (id == mkvmuxer::kMkvName) {

-      const long status =

-          UnserializeString(pReader, pos, size, info.nameAsUTF8);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvLanguage) {

-      const long status = UnserializeString(pReader, pos, size, info.language);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvDefaultDuration) {

-      const long long duration = UnserializeUInt(pReader, pos, size);

-      if (duration < 0)

-        return E_FILE_FORMAT_INVALID;

-      info.defaultDuration = static_cast<unsigned long long>(duration);

-    } else if (id == mkvmuxer::kMkvCodecID) {

-      const long status = UnserializeString(pReader, pos, size, info.codecId);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvFlagLacing) {

-      lacing = UnserializeUInt(pReader, pos, size);

-      if ((lacing < 0) || (lacing > 1))

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvCodecPrivate) {

-      delete[] info.codecPrivate;

-      info.codecPrivate = NULL;

-      info.codecPrivateSize = 0;

-      const size_t buflen = static_cast<size_t>(size);

-      if (buflen) {

-        unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

-        if (buf == NULL)

-          return -1;

-        const int status = pReader->Read(pos, static_cast<long>(buflen), buf);

-        if (status) {

-          delete[] buf;

-          return status;

-        }

-        info.codecPrivate = buf;

-        info.codecPrivateSize = buflen;

-      }

-    } else if (id == mkvmuxer::kMkvCodecName) {

-      const long status =

-          UnserializeString(pReader, pos, size, info.codecNameAsUTF8);

-      if (status)

-        return status;

-    } else if (id == mkvmuxer::kMkvCodecDelay) {

-      info.codecDelay = UnserializeUInt(pReader, pos, size);

-    } else if (id == mkvmuxer::kMkvSeekPreRoll) {

-      info.seekPreRoll = UnserializeUInt(pReader, pos, size);

-    }

-    pos += size;  // consume payload

-    if (pos > track_stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != track_stop)

-    return E_FILE_FORMAT_INVALID;

-  if (info.number <= 0)  // not specified

-    return E_FILE_FORMAT_INVALID;

-  if (GetTrackByNumber(info.number))

-    return E_FILE_FORMAT_INVALID;

-  if (info.type <= 0)  // not specified

-    return E_FILE_FORMAT_INVALID;

-  info.lacing = (lacing > 0) ? true : false;

-  if (info.type == Track::kVideo) {

-    if (v.start < 0)

-      return E_FILE_FORMAT_INVALID;

-    if (a.start >= 0)

-      return E_FILE_FORMAT_INVALID;

-    info.settings = v;

-    VideoTrack* pTrack = NULL;

-    const long status = VideoTrack::Parse(m_pSegment, info, element_start,

-                                          element_size, pTrack);

-    if (status)

-      return status;

-    pResult = pTrack;

-    assert(pResult);

-    if (e.start >= 0)

-      pResult->ParseContentEncodingsEntry(e.start, e.size);

-  } else if (info.type == Track::kAudio) {

-    if (a.start < 0)

-      return E_FILE_FORMAT_INVALID;

-    if (v.start >= 0)

-      return E_FILE_FORMAT_INVALID;

-    info.settings = a;

-    AudioTrack* pTrack = NULL;

-    const long status = AudioTrack::Parse(m_pSegment, info, element_start,

-                                          element_size, pTrack);

-    if (status)

-      return status;

-    pResult = pTrack;

-    assert(pResult);

-    if (e.start >= 0)

-      pResult->ParseContentEncodingsEntry(e.start, e.size);

-  } else {

-    // neither video nor audio - probably metadata or subtitles

-    if (a.start >= 0)

-      return E_FILE_FORMAT_INVALID;

-    if (v.start >= 0)

-      return E_FILE_FORMAT_INVALID;

-    if (info.type == Track::kMetadata && e.start >= 0)

-      return E_FILE_FORMAT_INVALID;

-    info.settings.start = -1;

-    info.settings.size = 0;

-    Track* pTrack = NULL;

-    const long status =

-        Track::Create(m_pSegment, info, element_start, element_size, pTrack);

-    if (status)

-      return status;

-    pResult = pTrack;

-    assert(pResult);

-  }

-  return 0;  // success

-}

-Tracks::~Tracks() {

-  Track** i = m_trackEntries;

-  Track** const j = m_trackEntriesEnd;

-  while (i != j) {

-    Track* const pTrack = *i++;

-    delete pTrack;

-  }

-  delete[] m_trackEntries;

-}

-const Track* Tracks::GetTrackByNumber(long tn) const {

-  if (tn < 0)

-    return NULL;

-  Track** i = m_trackEntries;

-  Track** const j = m_trackEntriesEnd;

-  while (i != j) {

-    Track* const pTrack = *i++;

-    if (pTrack == NULL)

-      continue;

-    if (tn == pTrack->GetNumber())

-      return pTrack;

-  }

-  return NULL;  // not found

-}

-const Track* Tracks::GetTrackByIndex(unsigned long idx) const {

-  const ptrdiff_t count = m_trackEntriesEnd - m_trackEntries;

-  if (idx >= static_cast<unsigned long>(count))

-    return NULL;

-  return m_trackEntries[idx];

-}

-long Cluster::Load(long long& pos, long& len) const {

-  if (m_pSegment == NULL)

-    return E_PARSE_FAILED;

-  if (m_timecode >= 0)  // at least partially loaded

-    return 0;

-  if (m_pos != m_element_start || m_element_size >= 0)

-    return E_PARSE_FAILED;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long total, avail;

-  const int status = pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  if (total >= 0 && (avail > total || m_pos > total))

-    return E_FILE_FORMAT_INVALID;

-  pos = m_pos;

-  long long cluster_size = -1;

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  long long result = GetUIntLength(pReader, pos, len);

-  if (result < 0)  // error or underflow

-    return static_cast<long>(result);

-  if (result > 0)

-    return E_BUFFER_NOT_FULL;

-  if ((pos + len) > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long id_ = ReadID(pReader, pos, len);

-  if (id_ < 0)  // error

-    return static_cast<long>(id_);

-  if (id_ != mkvmuxer::kMkvCluster)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume id

-  // read cluster size

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  result = GetUIntLength(pReader, pos, len);

-  if (result < 0)  // error

-    return static_cast<long>(result);

-  if (result > 0)

-    return E_BUFFER_NOT_FULL;

-  if ((pos + len) > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long size = ReadUInt(pReader, pos, len);

-  if (size < 0)  // error

-    return static_cast<long>(cluster_size);

-  if (size == 0)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume length of size of element

-  const long long unknown_size = (1LL << (7 * len)) - 1;

-  if (size != unknown_size)

-    cluster_size = size;

-  // pos points to start of payload

-  long long timecode = -1;

-  long long new_pos = -1;

-  bool bBlock = false;

-  long long cluster_stop = (cluster_size < 0) ? -1 : pos + cluster_size;

-  for (;;) {

-    if ((cluster_stop >= 0) && (pos >= cluster_stop))

-      break;

-    // Parse ID

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)  // error

-      return static_cast<long>(id);

-    if (id == 0)

-      return E_FILE_FORMAT_INVALID;

-    // This is the distinguished set of ID's we use to determine

-    // that we have exhausted the sub-element's inside the cluster

-    // whose ID we parsed earlier.

-    if (id == mkvmuxer::kMkvCluster)

-      break;

-    if (id == mkvmuxer::kMkvCues)

-      break;

-    pos += len;  // consume ID field

-    // Parse Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size == unknown_size)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume size field

-    if ((cluster_stop >= 0) && (pos > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    // pos now points to start of payload

-    if (size == 0)

-      continue;

-    if ((cluster_stop >= 0) && ((pos + size) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if (id == mkvmuxer::kMkvTimecode) {

-      len = static_cast<long>(size);

-      if ((pos + size) > avail)

-        return E_BUFFER_NOT_FULL;

-      timecode = UnserializeUInt(pReader, pos, size);

-      if (timecode < 0)  // error (or underflow)

-        return static_cast<long>(timecode);

-      new_pos = pos + size;

-      if (bBlock)

-        break;

-    } else if (id == mkvmuxer::kMkvBlockGroup) {

-      bBlock = true;

-      break;

-    } else if (id == mkvmuxer::kMkvSimpleBlock) {

-      bBlock = true;

-      break;

-    }

-    pos += size;  // consume payload

-    if (cluster_stop >= 0 && pos > cluster_stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (cluster_stop >= 0 && pos > cluster_stop)

-    return E_FILE_FORMAT_INVALID;

-  if (timecode < 0)  // no timecode found

-    return E_FILE_FORMAT_INVALID;

-  if (!bBlock)

-    return E_FILE_FORMAT_INVALID;

-  m_pos = new_pos;  // designates position just beyond timecode payload

-  m_timecode = timecode;  // m_timecode >= 0 means we're partially loaded

-  if (cluster_size >= 0)

-    m_element_size = cluster_stop - m_element_start;

-  return 0;

-}

-long Cluster::Parse(long long& pos, long& len) const {

-  long status = Load(pos, len);

-  if (status < 0)

-    return status;

-  if (m_pos < m_element_start || m_timecode < 0)

-    return E_PARSE_FAILED;

-  const long long cluster_stop =

-      (m_element_size < 0) ? -1 : m_element_start + m_element_size;

-  if ((cluster_stop >= 0) && (m_pos >= cluster_stop))

-    return 1;  // nothing else to do

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long total, avail;

-  status = pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  if (total >= 0 && avail > total)

-    return E_FILE_FORMAT_INVALID;

-  pos = m_pos;

-  for (;;) {

-    if ((cluster_stop >= 0) && (pos >= cluster_stop))

-      break;

-    if ((total >= 0) && (pos >= total)) {

-      if (m_element_size < 0)

-        m_element_size = pos - m_element_start;

-      break;

-    }

-    // Parse ID

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)

-      return E_FILE_FORMAT_INVALID;

-    // This is the distinguished set of ID's we use to determine

-    // that we have exhausted the sub-element's inside the cluster

-    // whose ID we parsed earlier.

-    if ((id == mkvmuxer::kMkvCluster) || (id == mkvmuxer::kMkvCues)) {

-      if (m_element_size < 0)

-        m_element_size = pos - m_element_start;

-      break;

-    }

-    pos += len;  // consume ID field

-    // Parse Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size == unknown_size)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume size field

-    if ((cluster_stop >= 0) && (pos > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    // pos now points to start of payload

-    if (size == 0)

-      continue;

-    // const long long block_start = pos;

-    const long long block_stop = pos + size;

-    if (cluster_stop >= 0) {

-      if (block_stop > cluster_stop) {

-        if (id == mkvmuxer::kMkvBlockGroup ||

-            id == mkvmuxer::kMkvSimpleBlock) {

-          return E_FILE_FORMAT_INVALID;

-        }

-        pos = cluster_stop;

-        break;

-      }

-    } else if ((total >= 0) && (block_stop > total)) {

-      m_element_size = total - m_element_start;

-      pos = total;

-      break;

-    } else if (block_stop > avail) {

-      len = static_cast<long>(size);

-      return E_BUFFER_NOT_FULL;

-    }

-    Cluster* const this_ = const_cast<Cluster*>(this);

-    if (id == mkvmuxer::kMkvBlockGroup)

-      return this_->ParseBlockGroup(size, pos, len);

-    if (id == mkvmuxer::kMkvSimpleBlock)

-      return this_->ParseSimpleBlock(size, pos, len);

-    pos += size;  // consume payload

-    if (cluster_stop >= 0 && pos > cluster_stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (m_element_size < 1)

-    return E_FILE_FORMAT_INVALID;

-  m_pos = pos;

-  if (cluster_stop >= 0 && m_pos > cluster_stop)

-    return E_FILE_FORMAT_INVALID;

-  if (m_entries_count > 0) {

-    const long idx = m_entries_count - 1;

-    const BlockEntry* const pLast = m_entries[idx];

-    if (pLast == NULL)

-      return E_PARSE_FAILED;

-    const Block* const pBlock = pLast->GetBlock();

-    if (pBlock == NULL)

-      return E_PARSE_FAILED;

-    const long long start = pBlock->m_start;

-    if ((total >= 0) && (start > total))

-      return E_PARSE_FAILED;  // defend against trucated stream

-    const long long size = pBlock->m_size;

-    const long long stop = start + size;

-    if (cluster_stop >= 0 && stop > cluster_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((total >= 0) && (stop > total))

-      return E_PARSE_FAILED;  // defend against trucated stream

-  }

-  return 1;  // no more entries

-}

-long Cluster::ParseSimpleBlock(long long block_size, long long& pos,

-                               long& len) {

-  const long long block_start = pos;

-  const long long block_stop = pos + block_size;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long total, avail;

-  long status = pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  // parse track number

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  long long result = GetUIntLength(pReader, pos, len);

-  if (result < 0)  // error

-    return static_cast<long>(result);

-  if (result > 0)  // weird

-    return E_BUFFER_NOT_FULL;

-  if ((pos + len) > block_stop)

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + len) > avail)

-    return E_BUFFER_NOT_FULL;

-  const long long track = ReadUInt(pReader, pos, len);

-  if (track < 0)  // error

-    return static_cast<long>(track);

-  if (track == 0)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume track number

-  if ((pos + 2) > block_stop)

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + 2) > avail) {

-    len = 2;

-    return E_BUFFER_NOT_FULL;

-  }

-  pos += 2;  // consume timecode

-  if ((pos + 1) > block_stop)

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + 1) > avail) {

-    len = 1;

-    return E_BUFFER_NOT_FULL;

-  }

-  unsigned char flags;

-  status = pReader->Read(pos, 1, &flags);

-  if (status < 0) {  // error or underflow

-    len = 1;

-    return status;

-  }

-  ++pos;  // consume flags byte

-  assert(pos <= avail);

-  if (pos >= block_stop)

-    return E_FILE_FORMAT_INVALID;

-  const int lacing = int(flags & 0x06) >> 1;

-  if ((lacing != 0) && (block_stop > avail)) {

-    len = static_cast<long>(block_stop - pos);

-    return E_BUFFER_NOT_FULL;

-  }

-  status = CreateBlock(mkvmuxer::kMkvSimpleBlock,

-                       block_start, block_size,

-                       0);  // DiscardPadding

-  if (status != 0)

-    return status;

-  m_pos = block_stop;

-  return 0;  // success

-}

-long Cluster::ParseBlockGroup(long long payload_size, long long& pos,

-                              long& len) {

-  const long long payload_start = pos;

-  const long long payload_stop = pos + payload_size;

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long total, avail;

-  long status = pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  if ((total >= 0) && (payload_stop > total))

-    return E_FILE_FORMAT_INVALID;

-  if (payload_stop > avail) {

-    len = static_cast<long>(payload_size);

-    return E_BUFFER_NOT_FULL;

-  }

-  long long discard_padding = 0;

-  while (pos < payload_stop) {

-    // parse sub-block element ID

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((pos + len) > payload_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)  // error

-      return static_cast<long>(id);

-    if (id == 0)  // not a valid ID

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume ID field

-    // Parse Size

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((pos + len) > payload_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    pos += len;  // consume size field

-    // pos now points to start of sub-block group payload

-    if (pos > payload_stop)

-      return E_FILE_FORMAT_INVALID;

-    if (size == 0)  // weird

-      continue;

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size == unknown_size)

-      return E_FILE_FORMAT_INVALID;

-    if (id == mkvmuxer::kMkvDiscardPadding) {

-      status = UnserializeInt(pReader, pos, size, discard_padding);

-      if (status < 0)  // error

-        return status;

-    }

-    if (id != mkvmuxer::kMkvBlock) {

-      pos += size;  // consume sub-part of block group

-      if (pos > payload_stop)

-        return E_FILE_FORMAT_INVALID;

-      continue;

-    }

-    const long long block_stop = pos + size;

-    if (block_stop > payload_stop)

-      return E_FILE_FORMAT_INVALID;

-    // parse track number

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((pos + len) > block_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long track = ReadUInt(pReader, pos, len);

-    if (track < 0)  // error

-      return static_cast<long>(track);

-    if (track == 0)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume track number

-    if ((pos + 2) > block_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + 2) > avail) {

-      len = 2;

-      return E_BUFFER_NOT_FULL;

-    }

-    pos += 2;  // consume timecode

-    if ((pos + 1) > block_stop)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    unsigned char flags;

-    status = pReader->Read(pos, 1, &flags);

-    if (status < 0) {  // error or underflow

-      len = 1;

-      return status;

-    }

-    ++pos;  // consume flags byte

-    assert(pos <= avail);

-    if (pos >= block_stop)

-      return E_FILE_FORMAT_INVALID;

-    const int lacing = int(flags & 0x06) >> 1;

-    if ((lacing != 0) && (block_stop > avail)) {

-      len = static_cast<long>(block_stop - pos);

-      return E_BUFFER_NOT_FULL;

-    }

-    pos = block_stop;  // consume block-part of block group

-    if (pos > payload_stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (pos != payload_stop)

-    return E_FILE_FORMAT_INVALID;

-  status = CreateBlock(mkvmuxer::kMkvBlockGroup,

-                       payload_start, payload_size, discard_padding);

-  if (status != 0)

-    return status;

-  m_pos = payload_stop;

-  return 0;  // success

-}

-long Cluster::GetEntry(long index, const mkvparser::BlockEntry*& pEntry) const {

-  assert(m_pos >= m_element_start);

-  pEntry = NULL;

-  if (index < 0)

-    return -1;  // generic error

-  if (m_entries_count < 0)

-    return E_BUFFER_NOT_FULL;

-  assert(m_entries);

-  assert(m_entries_size > 0);

-  assert(m_entries_count <= m_entries_size);

-  if (index < m_entries_count) {

-    pEntry = m_entries[index];

-    assert(pEntry);

-    return 1;  // found entry

-  }

-  if (m_element_size < 0)  // we don't know cluster end yet

-    return E_BUFFER_NOT_FULL;  // underflow

-  const long long element_stop = m_element_start + m_element_size;

-  if (m_pos >= element_stop)

-    return 0;  // nothing left to parse

-  return E_BUFFER_NOT_FULL;  // underflow, since more remains to be parsed

-}

-Cluster* Cluster::Create(Segment* pSegment, long idx, long long off) {

-  if (!pSegment || off < 0)

-    return NULL;

-  const long long element_start = pSegment->m_start + off;

-  Cluster* const pCluster =

-      new (std::nothrow) Cluster(pSegment, idx, element_start);

-  return pCluster;

-}

-Cluster::Cluster()

-    : m_pSegment(NULL),

-      m_element_start(0),

-      m_index(0),

-      m_pos(0),

-      m_element_size(0),

-      m_timecode(0),

-      m_entries(NULL),

-      m_entries_size(0),

-      m_entries_count(0)  // means "no entries"

-{}

-Cluster::Cluster(Segment* pSegment, long idx, long long element_start

-                 /* long long element_size */)

-    : m_pSegment(pSegment),

-      m_element_start(element_start),

-      m_index(idx),

-      m_pos(element_start),

-      m_element_size(-1 /* element_size */),

-      m_timecode(-1),

-      m_entries(NULL),

-      m_entries_size(0),

-      m_entries_count(-1)  // means "has not been parsed yet"

-{}

-Cluster::~Cluster() {

-  if (m_entries_count <= 0)

-    return;

-  BlockEntry** i = m_entries;

-  BlockEntry** const j = m_entries + m_entries_count;

-  while (i != j) {

-    BlockEntry* p = *i++;

-    assert(p);

-    delete p;

-  }

-  delete[] m_entries;

-}

-bool Cluster::EOS() const { return (m_pSegment == NULL); }

-long Cluster::GetIndex() const { return m_index; }

-long long Cluster::GetPosition() const {

-  const long long pos = m_element_start - m_pSegment->m_start;

-  assert(pos >= 0);

-  return pos;

-}

-long long Cluster::GetElementSize() const { return m_element_size; }

-long Cluster::HasBlockEntries(

-    const Segment* pSegment,

-    long long off,  // relative to start of segment payload

-    long long& pos, long& len) {

-  assert(pSegment);

-  assert(off >= 0);  // relative to segment

-  IMkvReader* const pReader = pSegment->m_pReader;

-  long long total, avail;

-  long status = pReader->Length(&total, &avail);

-  if (status < 0)  // error

-    return status;

-  assert((total < 0) || (avail <= total));

-  pos = pSegment->m_start + off;  // absolute

-  if ((total >= 0) && (pos >= total))

-    return 0;  // we don't even have a complete cluster

-  const long long segment_stop =

-      (pSegment->m_size < 0) ? -1 : pSegment->m_start + pSegment->m_size;

-  long long cluster_stop = -1;  // interpreted later to mean "unknown size"

-  {

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // need more data

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((total >= 0) && ((pos + len) > total))

-      return 0;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)  // error

-      return static_cast<long>(id);

-    if (id != mkvmuxer::kMkvCluster)

-      return E_PARSE_FAILED;

-    pos += len;  // consume Cluster ID field

-    // read size field

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // weird

-      return E_BUFFER_NOT_FULL;

-    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((total >= 0) && ((pos + len) > total))

-      return 0;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    if (size == 0)

-      return 0;  // cluster does not have entries

-    pos += len;  // consume size field

-    // pos now points to start of payload

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size != unknown_size) {

-      cluster_stop = pos + size;

-      assert(cluster_stop >= 0);

-      if ((segment_stop >= 0) && (cluster_stop > segment_stop))

-        return E_FILE_FORMAT_INVALID;

-      if ((total >= 0) && (cluster_stop > total))

-        // return E_FILE_FORMAT_INVALID;  //too conservative

-        return 0;  // cluster does not have any entries

-    }

-  }

-  for (;;) {

-    if ((cluster_stop >= 0) && (pos >= cluster_stop))

-      return 0;  // no entries detected

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    long long result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // need more data

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0)  // error

-      return static_cast<long>(id);

-    // This is the distinguished set of ID's we use to determine

-    // that we have exhausted the sub-element's inside the cluster

-    // whose ID we parsed earlier.

-    if (id == mkvmuxer::kMkvCluster)

-      return 0;  // no entries found

-    if (id == mkvmuxer::kMkvCues)

-      return 0;  // no entries found

-    pos += len;  // consume id field

-    if ((cluster_stop >= 0) && (pos >= cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    // read size field

-    if ((pos + 1) > avail) {

-      len = 1;

-      return E_BUFFER_NOT_FULL;

-    }

-    result = GetUIntLength(pReader, pos, len);

-    if (result < 0)  // error

-      return static_cast<long>(result);

-    if (result > 0)  // underflow

-      return E_BUFFER_NOT_FULL;

-    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > avail)

-      return E_BUFFER_NOT_FULL;

-    const long long size = ReadUInt(pReader, pos, len);

-    if (size < 0)  // error

-      return static_cast<long>(size);

-    pos += len;  // consume size field

-    // pos now points to start of payload

-    if ((cluster_stop >= 0) && (pos > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if (size == 0)  // weird

-      continue;

-    const long long unknown_size = (1LL << (7 * len)) - 1;

-    if (size == unknown_size)

-      return E_FILE_FORMAT_INVALID;  // not supported inside cluster

-    if ((cluster_stop >= 0) && ((pos + size) > cluster_stop))

-      return E_FILE_FORMAT_INVALID;

-    if (id == mkvmuxer::kMkvBlockGroup)

-      return 1;  // have at least one entry

-    if (id == mkvmuxer::kMkvSimpleBlock)

-      return 1;  // have at least one entry

-    pos += size;  // consume payload

-    if (cluster_stop >= 0 && pos > cluster_stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-}

-long long Cluster::GetTimeCode() const {

-  long long pos;

-  long len;

-  const long status = Load(pos, len);

-  if (status < 0)  // error

-    return status;

-  return m_timecode;

-}

-long long Cluster::GetTime() const {

-  const long long tc = GetTimeCode();

-  if (tc < 0)

-    return tc;

-  const SegmentInfo* const pInfo = m_pSegment->GetInfo();

-  assert(pInfo);

-  const long long scale = pInfo->GetTimeCodeScale();

-  assert(scale >= 1);

-  const long long t = m_timecode * scale;

-  return t;

-}

-long long Cluster::GetFirstTime() const {

-  const BlockEntry* pEntry;

-  const long status = GetFirst(pEntry);

-  if (status < 0)  // error

-    return status;

-  if (pEntry == NULL)  // empty cluster

-    return GetTime();

-  const Block* const pBlock = pEntry->GetBlock();

-  assert(pBlock);

-  return pBlock->GetTime(this);

-}

-long long Cluster::GetLastTime() const {

-  const BlockEntry* pEntry;

-  const long status = GetLast(pEntry);

-  if (status < 0)  // error

-    return status;

-  if (pEntry == NULL)  // empty cluster

-    return GetTime();

-  const Block* const pBlock = pEntry->GetBlock();

-  assert(pBlock);

-  return pBlock->GetTime(this);

-}

-long Cluster::CreateBlock(long long id,

-                          long long pos,  // absolute pos of payload

-                          long long size, long long discard_padding) {

-  if (id != mkvmuxer::kMkvBlockGroup && id != mkvmuxer::kMkvSimpleBlock)

-    return E_PARSE_FAILED;

-  if (m_entries_count < 0) {  // haven't parsed anything yet

-    assert(m_entries == NULL);

-    assert(m_entries_size == 0);

-    m_entries_size = 1024;

-    m_entries = new (std::nothrow) BlockEntry*[m_entries_size];

-    if (m_entries == NULL)

-      return -1;

-    m_entries_count = 0;

-  } else {

-    assert(m_entries);

-    assert(m_entries_size > 0);

-    assert(m_entries_count <= m_entries_size);

-    if (m_entries_count >= m_entries_size) {

-      const long entries_size = 2 * m_entries_size;

-      BlockEntry** const entries = new (std::nothrow) BlockEntry*[entries_size];

-      if (entries == NULL)

-        return -1;

-      BlockEntry** src = m_entries;

-      BlockEntry** const src_end = src + m_entries_count;

-      BlockEntry** dst = entries;

-      while (src != src_end)

-        *dst++ = *src++;

-      delete[] m_entries;

-      m_entries = entries;

-      m_entries_size = entries_size;

-    }

-  }

-  if (id == mkvmuxer::kMkvBlockGroup)

-    return CreateBlockGroup(pos, size, discard_padding);

-  else

-    return CreateSimpleBlock(pos, size);

-}

-long Cluster::CreateBlockGroup(long long start_offset, long long size,

-                               long long discard_padding) {

-  assert(m_entries);

-  assert(m_entries_size > 0);

-  assert(m_entries_count >= 0);

-  assert(m_entries_count < m_entries_size);

-  IMkvReader* const pReader = m_pSegment->m_pReader;

-  long long pos = start_offset;

-  const long long stop = start_offset + size;

-  // For WebM files, there is a bias towards previous reference times

-  //(in order to support alt-ref frames, which refer back to the previous

-  // keyframe).  Normally a 0 value is not possible, but here we tenatively

-  // allow 0 as the value of a reference frame, with the interpretation

-  // that this is a "previous" reference time.

-  long long prev = 1;  // nonce

-  long long next = 0;  // nonce

-  long long duration = -1;  // really, this is unsigned

-  long long bpos = -1;

-  long long bsize = -1;

-  while (pos < stop) {

-    long len;

-    const long long id = ReadID(pReader, pos, len);

-    if (id < 0 || (pos + len) > stop)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume ID

-    const long long size = ReadUInt(pReader, pos, len);

-    assert(size >= 0);  // TODO

-    assert((pos + len) <= stop);

-    pos += len;  // consume size

-    if (id == mkvmuxer::kMkvBlock) {

-      if (bpos < 0) {  // Block ID

-        bpos = pos;

-        bsize = size;

-      }

-    } else if (id == mkvmuxer::kMkvBlockDuration) {

-      if (size > 8)

-        return E_FILE_FORMAT_INVALID;

-      duration = UnserializeUInt(pReader, pos, size);

-      if (duration < 0)

-        return E_FILE_FORMAT_INVALID;

-    } else if (id == mkvmuxer::kMkvReferenceBlock) {

-      if (size > 8 || size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      const long size_ = static_cast<long>(size);

-      long long time;

-      long status = UnserializeInt(pReader, pos, size_, time);

-      assert(status == 0);

-      if (status != 0)

-        return -1;

-      if (time <= 0)  // see note above

-        prev = time;

-      else

-        next = time;

-    }

-    pos += size;  // consume payload

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  if (bpos < 0)

-    return E_FILE_FORMAT_INVALID;

-  if (pos != stop)

-    return E_FILE_FORMAT_INVALID;

-  assert(bsize >= 0);

-  const long idx = m_entries_count;

-  BlockEntry** const ppEntry = m_entries + idx;

-  BlockEntry*& pEntry = *ppEntry;

-  pEntry = new (std::nothrow)

-      BlockGroup(this, idx, bpos, bsize, prev, next, duration, discard_padding);

-  if (pEntry == NULL)

-    return -1;  // generic error

-  BlockGroup* const p = static_cast<BlockGroup*>(pEntry);

-  const long status = p->Parse();

-  if (status == 0) {  // success

-    ++m_entries_count;

-    return 0;

-  }

-  delete pEntry;

-  pEntry = 0;

-  return status;

-}

-long Cluster::CreateSimpleBlock(long long st, long long sz) {

-  assert(m_entries);

-  assert(m_entries_size > 0);

-  assert(m_entries_count >= 0);

-  assert(m_entries_count < m_entries_size);

-  const long idx = m_entries_count;

-  BlockEntry** const ppEntry = m_entries + idx;

-  BlockEntry*& pEntry = *ppEntry;

-  pEntry = new (std::nothrow) SimpleBlock(this, idx, st, sz);

-  if (pEntry == NULL)

-    return -1;  // generic error

-  SimpleBlock* const p = static_cast<SimpleBlock*>(pEntry);

-  const long status = p->Parse();

-  if (status == 0) {

-    ++m_entries_count;

-    return 0;

-  }

-  delete pEntry;

-  pEntry = 0;

-  return status;

-}

-long Cluster::GetFirst(const BlockEntry*& pFirst) const {

-  if (m_entries_count <= 0) {

-    long long pos;

-    long len;

-    const long status = Parse(pos, len);

-    if (status < 0) {  // error

-      pFirst = NULL;

-      return status;

-    }

-    if (m_entries_count <= 0) {  // empty cluster

-      pFirst = NULL;

-      return 0;

-    }

-  }

-  assert(m_entries);

-  pFirst = m_entries[0];

-  assert(pFirst);

-  return 0;  // success

-}

-long Cluster::GetLast(const BlockEntry*& pLast) const {

-  for (;;) {

-    long long pos;

-    long len;

-    const long status = Parse(pos, len);

-    if (status < 0) {  // error

-      pLast = NULL;

-      return status;

-    }

-    if (status > 0)  // no new block

-      break;

-  }

-  if (m_entries_count <= 0) {

-    pLast = NULL;

-    return 0;

-  }

-  assert(m_entries);

-  const long idx = m_entries_count - 1;

-  pLast = m_entries[idx];

-  assert(pLast);

-  return 0;

-}

-long Cluster::GetNext(const BlockEntry* pCurr, const BlockEntry*& pNext) const {

-  assert(pCurr);

-  assert(m_entries);

-  assert(m_entries_count > 0);

-  size_t idx = pCurr->GetIndex();

-  assert(idx < size_t(m_entries_count));

-  assert(m_entries[idx] == pCurr);

-  ++idx;

-  if (idx >= size_t(m_entries_count)) {

-    long long pos;

-    long len;

-    const long status = Parse(pos, len);

-    if (status < 0) {  // error

-      pNext = NULL;

-      return status;

-    }

-    if (status > 0) {

-      pNext = NULL;

-      return 0;

-    }

-    assert(m_entries);

-    assert(m_entries_count > 0);

-    assert(idx < size_t(m_entries_count));

-  }

-  pNext = m_entries[idx];

-  assert(pNext);

-  return 0;

-}

-long Cluster::GetEntryCount() const { return m_entries_count; }

-const BlockEntry* Cluster::GetEntry(const Track* pTrack,

-                                    long long time_ns) const {

-  assert(pTrack);

-  if (m_pSegment == NULL)  // this is the special EOS cluster

-    return pTrack->GetEOS();

-  const BlockEntry* pResult = pTrack->GetEOS();

-  long index = 0;

-  for (;;) {

-    if (index >= m_entries_count) {

-      long long pos;

-      long len;

-      const long status = Parse(pos, len);

-      assert(status >= 0);

-      if (status > 0)  // completely parsed, and no more entries

-        return pResult;

-      if (status < 0)  // should never happen

-        return 0;

-      assert(m_entries);

-      assert(index < m_entries_count);

-    }

-    const BlockEntry* const pEntry = m_entries[index];

-    assert(pEntry);

-    assert(!pEntry->EOS());

-    const Block* const pBlock = pEntry->GetBlock();

-    assert(pBlock);

-    if (pBlock->GetTrackNumber() != pTrack->GetNumber()) {

-      ++index;

-      continue;

-    }

-    if (pTrack->VetEntry(pEntry)) {

-      if (time_ns < 0)  // just want first candidate block

-        return pEntry;

-      const long long ns = pBlock->GetTime(this);

-      if (ns > time_ns)

-        return pResult;

-      pResult = pEntry;  // have a candidate

-    } else if (time_ns >= 0) {

-      const long long ns = pBlock->GetTime(this);

-      if (ns > time_ns)

-        return pResult;

-    }

-    ++index;

-  }

-}

-const BlockEntry* Cluster::GetEntry(const CuePoint& cp,

-                                    const CuePoint::TrackPosition& tp) const {

-  assert(m_pSegment);

-  const long long tc = cp.GetTimeCode();

-  if (tp.m_block > 0) {

-    const long block = static_cast<long>(tp.m_block);

-    const long index = block - 1;

-    while (index >= m_entries_count) {

-      long long pos;

-      long len;

-      const long status = Parse(pos, len);

-      if (status < 0)  // TODO: can this happen?

-        return NULL;

-      if (status > 0)  // nothing remains to be parsed

-        return NULL;

-    }

-    const BlockEntry* const pEntry = m_entries[index];

-    assert(pEntry);

-    assert(!pEntry->EOS());

-    const Block* const pBlock = pEntry->GetBlock();

-    assert(pBlock);

-    if ((pBlock->GetTrackNumber() == tp.m_track) &&

-        (pBlock->GetTimeCode(this) == tc)) {

-      return pEntry;

-    }

-  }

-  long index = 0;

-  for (;;) {

-    if (index >= m_entries_count) {

-      long long pos;

-      long len;

-      const long status = Parse(pos, len);

-      if (status < 0)  // TODO: can this happen?

-        return NULL;

-      if (status > 0)  // nothing remains to be parsed

-        return NULL;

-      assert(m_entries);

-      assert(index < m_entries_count);

-    }

-    const BlockEntry* const pEntry = m_entries[index];

-    assert(pEntry);

-    assert(!pEntry->EOS());

-    const Block* const pBlock = pEntry->GetBlock();

-    assert(pBlock);

-    if (pBlock->GetTrackNumber() != tp.m_track) {

-      ++index;

-      continue;

-    }

-    const long long tc_ = pBlock->GetTimeCode(this);

-    if (tc_ < tc) {

-      ++index;

-      continue;

-    }

-    if (tc_ > tc)

-      return NULL;

-    const Tracks* const pTracks = m_pSegment->GetTracks();

-    assert(pTracks);

-    const long tn = static_cast<long>(tp.m_track);

-    const Track* const pTrack = pTracks->GetTrackByNumber(tn);

-    if (pTrack == NULL)

-      return NULL;

-    const long long type = pTrack->GetType();

-    if (type == 2)  // audio

-      return pEntry;

-    if (type != 1)  // not video

-      return NULL;

-    if (!pBlock->IsKey())

-      return NULL;

-    return pEntry;

-  }

-}

-BlockEntry::BlockEntry(Cluster* p, long idx) : m_pCluster(p), m_index(idx) {}

-BlockEntry::~BlockEntry() {}

-bool BlockEntry::EOS() const { return (GetKind() == kBlockEOS); }

-const Cluster* BlockEntry::GetCluster() const { return m_pCluster; }

-long BlockEntry::GetIndex() const { return m_index; }

-SimpleBlock::SimpleBlock(Cluster* pCluster, long idx, long long start,

-                         long long size)

-    : BlockEntry(pCluster, idx), m_block(start, size, 0) {}

-long SimpleBlock::Parse() { return m_block.Parse(m_pCluster); }

-BlockEntry::Kind SimpleBlock::GetKind() const { return kBlockSimple; }

-const Block* SimpleBlock::GetBlock() const { return &m_block; }

-BlockGroup::BlockGroup(Cluster* pCluster, long idx, long long block_start,

-                       long long block_size, long long prev, long long next,

-                       long long duration, long long discard_padding)

-    : BlockEntry(pCluster, idx),

-      m_block(block_start, block_size, discard_padding),

-      m_prev(prev),

-      m_next(next),

-      m_duration(duration) {}

-long BlockGroup::Parse() {

-  const long status = m_block.Parse(m_pCluster);

-  if (status)

-    return status;

-  m_block.SetKey((m_prev > 0) && (m_next <= 0));

-  return 0;

-}

-BlockEntry::Kind BlockGroup::GetKind() const { return kBlockGroup; }

-const Block* BlockGroup::GetBlock() const { return &m_block; }

-long long BlockGroup::GetPrevTimeCode() const { return m_prev; }

-long long BlockGroup::GetNextTimeCode() const { return m_next; }

-long long BlockGroup::GetDurationTimeCode() const { return m_duration; }

-Block::Block(long long start, long long size_, long long discard_padding)

-    : m_start(start),

-      m_size(size_),

-      m_track(0),

-      m_timecode(-1),

-      m_flags(0),

-      m_frames(NULL),

-      m_frame_count(-1),

-      m_discard_padding(discard_padding) {}

-Block::~Block() { delete[] m_frames; }

-long Block::Parse(const Cluster* pCluster) {

-  if (pCluster == NULL)

-    return -1;

-  if (pCluster->m_pSegment == NULL)

-    return -1;

-  assert(m_start >= 0);

-  assert(m_size >= 0);

-  assert(m_track <= 0);

-  assert(m_frames == NULL);

-  assert(m_frame_count <= 0);

-  long long pos = m_start;

-  const long long stop = m_start + m_size;

-  long len;

-  IMkvReader* const pReader = pCluster->m_pSegment->m_pReader;

-  m_track = ReadUInt(pReader, pos, len);

-  if (m_track <= 0)

-    return E_FILE_FORMAT_INVALID;

-  if ((pos + len) > stop)

-    return E_FILE_FORMAT_INVALID;

-  pos += len;  // consume track number

-  if ((stop - pos) < 2)

-    return E_FILE_FORMAT_INVALID;

-  long status;

-  long long value;

-  status = UnserializeInt(pReader, pos, 2, value);

-  if (status)

-    return E_FILE_FORMAT_INVALID;

-  if (value < SHRT_MIN)

-    return E_FILE_FORMAT_INVALID;

-  if (value > SHRT_MAX)

-    return E_FILE_FORMAT_INVALID;

-  m_timecode = static_cast<short>(value);

-  pos += 2;

-  if ((stop - pos) <= 0)

-    return E_FILE_FORMAT_INVALID;

-  status = pReader->Read(pos, 1, &m_flags);

-  if (status)

-    return E_FILE_FORMAT_INVALID;

-  const int lacing = int(m_flags & 0x06) >> 1;

-  ++pos;  // consume flags byte

-  if (lacing == 0) {  // no lacing

-    if (pos > stop)

-      return E_FILE_FORMAT_INVALID;

-    m_frame_count = 1;

-    m_frames = new (std::nothrow) Frame[m_frame_count];

-    if (m_frames == NULL)

-      return -1;

-    Frame& f = m_frames[0];

-    f.pos = pos;

-    const long long frame_size = stop - pos;

-    if (frame_size > LONG_MAX || frame_size <= 0)

-      return E_FILE_FORMAT_INVALID;

-    f.len = static_cast<long>(frame_size);

-    return 0;  // success

-  }

-  if (pos >= stop)

-    return E_FILE_FORMAT_INVALID;

-  unsigned char biased_count;

-  status = pReader->Read(pos, 1, &biased_count);

-  if (status)

-    return E_FILE_FORMAT_INVALID;

-  ++pos;  // consume frame count

-  if (pos > stop)

-    return E_FILE_FORMAT_INVALID;

-  m_frame_count = int(biased_count) + 1;

-  m_frames = new (std::nothrow) Frame[m_frame_count];

-  if (m_frames == NULL)

-    return -1;

-  if (!m_frames)

-    return E_FILE_FORMAT_INVALID;

-  if (lacing == 1) {  // Xiph

-    Frame* pf = m_frames;

-    Frame* const pf_end = pf + m_frame_count;

-    long long size = 0;

-    int frame_count = m_frame_count;

-    while (frame_count > 1) {

-      long frame_size = 0;

-      for (;;) {

-        unsigned char val;

-        if (pos >= stop)

-          return E_FILE_FORMAT_INVALID;

-        status = pReader->Read(pos, 1, &val);

-        if (status)

-          return E_FILE_FORMAT_INVALID;

-        ++pos;  // consume xiph size byte

-        frame_size += val;

-        if (val < 255)

-          break;

-      }

-      Frame& f = *pf++;

-      assert(pf < pf_end);

-      if (pf >= pf_end)

-        return E_FILE_FORMAT_INVALID;

-      f.pos = 0;  // patch later

-      if (frame_size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      f.len = frame_size;

-      size += frame_size;  // contribution of this frame

-      --frame_count;

-    }

-    if (pf >= pf_end || pos > stop)

-      return E_FILE_FORMAT_INVALID;

-    {

-      Frame& f = *pf++;

-      if (pf != pf_end)

-        return E_FILE_FORMAT_INVALID;

-      f.pos = 0;  // patch later

-      const long long total_size = stop - pos;

-      if (total_size < size)

-        return E_FILE_FORMAT_INVALID;

-      const long long frame_size = total_size - size;

-      if (frame_size > LONG_MAX || frame_size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      f.len = static_cast<long>(frame_size);

-    }

-    pf = m_frames;

-    while (pf != pf_end) {

-      Frame& f = *pf++;

-      assert((pos + f.len) <= stop);

-      if ((pos + f.len) > stop)

-        return E_FILE_FORMAT_INVALID;

-      f.pos = pos;

-      pos += f.len;

-    }

-    assert(pos == stop);

-    if (pos != stop)

-      return E_FILE_FORMAT_INVALID;

-  } else if (lacing == 2) {  // fixed-size lacing

-    if (pos >= stop)

-      return E_FILE_FORMAT_INVALID;

-    const long long total_size = stop - pos;

-    if ((total_size % m_frame_count) != 0)

-      return E_FILE_FORMAT_INVALID;

-    const long long frame_size = total_size / m_frame_count;

-    if (frame_size > LONG_MAX || frame_size <= 0)

-      return E_FILE_FORMAT_INVALID;

-    Frame* pf = m_frames;

-    Frame* const pf_end = pf + m_frame_count;

-    while (pf != pf_end) {

-      assert((pos + frame_size) <= stop);

-      if ((pos + frame_size) > stop)

-        return E_FILE_FORMAT_INVALID;

-      Frame& f = *pf++;

-      f.pos = pos;

-      f.len = static_cast<long>(frame_size);

-      pos += frame_size;

-    }

-    assert(pos == stop);

-    if (pos != stop)

-      return E_FILE_FORMAT_INVALID;

-  } else {

-    assert(lacing == 3);  // EBML lacing

-    if (pos >= stop)

-      return E_FILE_FORMAT_INVALID;

-    long long size = 0;

-    int frame_count = m_frame_count;

-    long long frame_size = ReadUInt(pReader, pos, len);

-    if (frame_size <= 0)

-      return E_FILE_FORMAT_INVALID;

-    if (frame_size > LONG_MAX)

-      return E_FILE_FORMAT_INVALID;

-    if ((pos + len) > stop)

-      return E_FILE_FORMAT_INVALID;

-    pos += len;  // consume length of size of first frame

-    if ((pos + frame_size) > stop)

-      return E_FILE_FORMAT_INVALID;

-    Frame* pf = m_frames;

-    Frame* const pf_end = pf + m_frame_count;

-    {

-      Frame& curr = *pf;

-      curr.pos = 0;  // patch later

-      curr.len = static_cast<long>(frame_size);

-      size += curr.len;  // contribution of this frame

-    }

-    --frame_count;

-    while (frame_count > 1) {

-      if (pos >= stop)

-        return E_FILE_FORMAT_INVALID;

-      assert(pf < pf_end);

-      if (pf >= pf_end)

-        return E_FILE_FORMAT_INVALID;

-      const Frame& prev = *pf++;

-      assert(prev.len == frame_size);

-      if (prev.len != frame_size)

-        return E_FILE_FORMAT_INVALID;

-      assert(pf < pf_end);

-      if (pf >= pf_end)

-        return E_FILE_FORMAT_INVALID;

-      Frame& curr = *pf;

-      curr.pos = 0;  // patch later

-      const long long delta_size_ = ReadUInt(pReader, pos, len);

-      if (delta_size_ < 0)

-        return E_FILE_FORMAT_INVALID;

-      if ((pos + len) > stop)

-        return E_FILE_FORMAT_INVALID;

-      pos += len;  // consume length of (delta) size

-      if (pos > stop)

-        return E_FILE_FORMAT_INVALID;

-      const int exp = 7 * len - 1;

-      const long long bias = (1LL << exp) - 1LL;

-      const long long delta_size = delta_size_ - bias;

-      frame_size += delta_size;

-      if (frame_size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      if (frame_size > LONG_MAX)

-        return E_FILE_FORMAT_INVALID;

-      curr.len = static_cast<long>(frame_size);

-      size += curr.len;  // contribution of this frame

-      --frame_count;

-    }

-    // parse last frame

-    if (frame_count > 0) {

-      if (pos > stop || pf >= pf_end)

-        return E_FILE_FORMAT_INVALID;

-      const Frame& prev = *pf++;

-      assert(prev.len == frame_size);

-      if (prev.len != frame_size)

-        return E_FILE_FORMAT_INVALID;

-      if (pf >= pf_end)

-        return E_FILE_FORMAT_INVALID;

-      Frame& curr = *pf++;

-      if (pf != pf_end)

-        return E_FILE_FORMAT_INVALID;

-      curr.pos = 0;  // patch later

-      const long long total_size = stop - pos;

-      if (total_size < size)

-        return E_FILE_FORMAT_INVALID;

-      frame_size = total_size - size;

-      if (frame_size > LONG_MAX || frame_size <= 0)

-        return E_FILE_FORMAT_INVALID;

-      curr.len = static_cast<long>(frame_size);

-    }

-    pf = m_frames;

-    while (pf != pf_end) {

-      Frame& f = *pf++;

-      assert((pos + f.len) <= stop);

-      if ((pos + f.len) > stop)

-        return E_FILE_FORMAT_INVALID;

-      f.pos = pos;

-      pos += f.len;

-    }

-    if (pos != stop)

-      return E_FILE_FORMAT_INVALID;

-  }

-  return 0;  // success

-}

-long long Block::GetTimeCode(const Cluster* pCluster) const {

-  if (pCluster == 0)

-    return m_timecode;

-  const long long tc0 = pCluster->GetTimeCode();

-  assert(tc0 >= 0);

-  const long long tc = tc0 + m_timecode;

-  return tc;  // unscaled timecode units

-}

-long long Block::GetTime(const Cluster* pCluster) const {

-  assert(pCluster);

-  const long long tc = GetTimeCode(pCluster);

-  const Segment* const pSegment = pCluster->m_pSegment;

-  const SegmentInfo* const pInfo = pSegment->GetInfo();

-  assert(pInfo);

-  const long long scale = pInfo->GetTimeCodeScale();

-  assert(scale >= 1);

-  const long long ns = tc * scale;

-  return ns;

-}

-long long Block::GetTrackNumber() const { return m_track; }

-bool Block::IsKey() const {

-  return ((m_flags & static_cast<unsigned char>(1 << 7)) != 0);

-}

-void Block::SetKey(bool bKey) {

-  if (bKey)

-    m_flags |= static_cast<unsigned char>(1 << 7);

-  else

-    m_flags &= 0x7F;

-}

-bool Block::IsInvisible() const { return bool(int(m_flags & 0x08) != 0); }

-Block::Lacing Block::GetLacing() const {

-  const int value = int(m_flags & 0x06) >> 1;

-  return static_cast<Lacing>(value);

-}

-int Block::GetFrameCount() const { return m_frame_count; }

-const Block::Frame& Block::GetFrame(int idx) const {

-  assert(idx >= 0);

-  assert(idx < m_frame_count);

-  const Frame& f = m_frames[idx];

-  assert(f.pos > 0);

-  assert(f.len > 0);

-  return f;

-}

-long Block::Frame::Read(IMkvReader* pReader, unsigned char* buf) const {

-  assert(pReader);

-  assert(buf);

-  const long status = pReader->Read(pos, len, buf);

-  return status;

-}

-long long Block::GetDiscardPadding() const { return m_discard_padding; }

-}  // end namespace mkvparser

--- a/third_party/libwebm/mkvparser.hpp

+++ /dev/null

@@ -1,1025 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVPARSER_HPP

-#define MKVPARSER_HPP

-#include <cstddef>

-#include <cstdio>

-#include <cstdlib>

-namespace mkvparser {

-const int E_PARSE_FAILED = -1;

-const int E_FILE_FORMAT_INVALID = -2;

-const int E_BUFFER_NOT_FULL = -3;

-class IMkvReader {

- public:

-  virtual int Read(long long pos, long len, unsigned char* buf) = 0;

-  virtual int Length(long long* total, long long* available) = 0;

- protected:

-  virtual ~IMkvReader();

-};

-template<typename Type> Type* SafeArrayAlloc(unsigned long long num_elements,

-                                             unsigned long long element_size);

-long long GetUIntLength(IMkvReader*, long long, long&);

-long long ReadUInt(IMkvReader*, long long, long&);

-long long ReadID(IMkvReader* pReader, long long pos, long& len);

-long long UnserializeUInt(IMkvReader*, long long pos, long long size);

-long UnserializeFloat(IMkvReader*, long long pos, long long size, double&);

-long UnserializeInt(IMkvReader*, long long pos, long long size,

-                    long long& result);

-long UnserializeString(IMkvReader*, long long pos, long long size, char*& str);

-long ParseElementHeader(IMkvReader* pReader,

-                        long long& pos,  // consume id and size fields

-                        long long stop,  // if you know size of element's parent

-                        long long& id, long long& size);

-bool Match(IMkvReader*, long long&, unsigned long, long long&);

-bool Match(IMkvReader*, long long&, unsigned long, unsigned char*&, size_t&);

-void GetVersion(int& major, int& minor, int& build, int& revision);

-struct EBMLHeader {

-  EBMLHeader();

-  ~EBMLHeader();

-  long long m_version;

-  long long m_readVersion;

-  long long m_maxIdLength;

-  long long m_maxSizeLength;

-  char* m_docType;

-  long long m_docTypeVersion;

-  long long m_docTypeReadVersion;

-  long long Parse(IMkvReader*, long long&);

-  void Init();

-};

-class Segment;

-class Track;

-class Cluster;

-class Block {

-  Block(const Block&);

-  Block& operator=(const Block&);

- public:

-  const long long m_start;

-  const long long m_size;

-  Block(long long start, long long size, long long discard_padding);

-  ~Block();

-  long Parse(const Cluster*);

-  long long GetTrackNumber() const;

-  long long GetTimeCode(const Cluster*) const;  // absolute, but not scaled

-  long long GetTime(const Cluster*) const;  // absolute, and scaled (ns)

-  bool IsKey() const;

-  void SetKey(bool);

-  bool IsInvisible() const;

-  enum Lacing { kLacingNone, kLacingXiph, kLacingFixed, kLacingEbml };

-  Lacing GetLacing() const;

-  int GetFrameCount() const;  // to index frames: [0, count)

-  struct Frame {

-    long long pos;  // absolute offset

-    long len;

-    long Read(IMkvReader*, unsigned char*) const;

-  };

-  const Frame& GetFrame(int frame_index) const;

-  long long GetDiscardPadding() const;

- private:

-  long long m_track;  // Track::Number()

-  short m_timecode;  // relative to cluster

-  unsigned char m_flags;

-  Frame* m_frames;

-  int m_frame_count;

- protected:

-  const long long m_discard_padding;

-};

-class BlockEntry {

-  BlockEntry(const BlockEntry&);

-  BlockEntry& operator=(const BlockEntry&);

- protected:

-  BlockEntry(Cluster*, long index);

- public:

-  virtual ~BlockEntry();

-  bool EOS() const;

-  const Cluster* GetCluster() const;

-  long GetIndex() const;

-  virtual const Block* GetBlock() const = 0;

-  enum Kind { kBlockEOS, kBlockSimple, kBlockGroup };

-  virtual Kind GetKind() const = 0;

- protected:

-  Cluster* const m_pCluster;

-  const long m_index;

-};

-class SimpleBlock : public BlockEntry {

-  SimpleBlock(const SimpleBlock&);

-  SimpleBlock& operator=(const SimpleBlock&);

- public:

-  SimpleBlock(Cluster*, long index, long long start, long long size);

-  long Parse();

-  Kind GetKind() const;

-  const Block* GetBlock() const;

- protected:

-  Block m_block;

-};

-class BlockGroup : public BlockEntry {

-  BlockGroup(const BlockGroup&);

-  BlockGroup& operator=(const BlockGroup&);

- public:

-  BlockGroup(Cluster*, long index,

-             long long block_start,  // absolute pos of block's payload

-             long long block_size,  // size of block's payload

-             long long prev, long long next, long long duration,

-             long long discard_padding);

-  long Parse();

-  Kind GetKind() const;

-  const Block* GetBlock() const;

-  long long GetPrevTimeCode() const;  // relative to block's time

-  long long GetNextTimeCode() const;  // as above

-  long long GetDurationTimeCode() const;

- private:

-  Block m_block;

-  const long long m_prev;

-  const long long m_next;

-  const long long m_duration;

-};

-///////////////////////////////////////////////////////////////

-// ContentEncoding element

-// Elements used to describe if the track data has been encrypted or

-// compressed with zlib or header stripping.

-class ContentEncoding {

- public:

-  enum { kCTR = 1 };

-  ContentEncoding();

-  ~ContentEncoding();

-  // ContentCompression element names

-  struct ContentCompression {

-    ContentCompression();

-    ~ContentCompression();

-    unsigned long long algo;

-    unsigned char* settings;

-    long long settings_len;

-  };

-  // ContentEncAESSettings element names

-  struct ContentEncAESSettings {

-    ContentEncAESSettings() : cipher_mode(kCTR) {}

-    ~ContentEncAESSettings() {}

-    unsigned long long cipher_mode;

-  };

-  // ContentEncryption element names

-  struct ContentEncryption {

-    ContentEncryption();

-    ~ContentEncryption();

-    unsigned long long algo;

-    unsigned char* key_id;

-    long long key_id_len;

-    unsigned char* signature;

-    long long signature_len;

-    unsigned char* sig_key_id;

-    long long sig_key_id_len;

-    unsigned long long sig_algo;

-    unsigned long long sig_hash_algo;

-    ContentEncAESSettings aes_settings;

-  };

-  // Returns ContentCompression represented by |idx|. Returns NULL if |idx|

-  // is out of bounds.

-  const ContentCompression* GetCompressionByIndex(unsigned long idx) const;

-  // Returns number of ContentCompression elements in this ContentEncoding

-  // element.

-  unsigned long GetCompressionCount() const;

-  // Parses the ContentCompression element from |pReader|. |start| is the

-  // starting offset of the ContentCompression payload. |size| is the size in

-  // bytes of the ContentCompression payload. |compression| is where the parsed

-  // values will be stored.

-  long ParseCompressionEntry(long long start, long long size,

-                             IMkvReader* pReader,

-                             ContentCompression* compression);

-  // Returns ContentEncryption represented by |idx|. Returns NULL if |idx|

-  // is out of bounds.

-  const ContentEncryption* GetEncryptionByIndex(unsigned long idx) const;

-  // Returns number of ContentEncryption elements in this ContentEncoding

-  // element.

-  unsigned long GetEncryptionCount() const;

-  // Parses the ContentEncAESSettings element from |pReader|. |start| is the

-  // starting offset of the ContentEncAESSettings payload. |size| is the

-  // size in bytes of the ContentEncAESSettings payload. |encryption| is

-  // where the parsed values will be stored.

-  long ParseContentEncAESSettingsEntry(long long start, long long size,

-                                       IMkvReader* pReader,

-                                       ContentEncAESSettings* aes);

-  // Parses the ContentEncoding element from |pReader|. |start| is the

-  // starting offset of the ContentEncoding payload. |size| is the size in

-  // bytes of the ContentEncoding payload. Returns true on success.

-  long ParseContentEncodingEntry(long long start, long long size,

-                                 IMkvReader* pReader);

-  // Parses the ContentEncryption element from |pReader|. |start| is the

-  // starting offset of the ContentEncryption payload. |size| is the size in

-  // bytes of the ContentEncryption payload. |encryption| is where the parsed

-  // values will be stored.

-  long ParseEncryptionEntry(long long start, long long size,

-                            IMkvReader* pReader, ContentEncryption* encryption);

-  unsigned long long encoding_order() const { return encoding_order_; }

-  unsigned long long encoding_scope() const { return encoding_scope_; }

-  unsigned long long encoding_type() const { return encoding_type_; }

- private:

-  // Member variables for list of ContentCompression elements.

-  ContentCompression** compression_entries_;

-  ContentCompression** compression_entries_end_;

-  // Member variables for list of ContentEncryption elements.

-  ContentEncryption** encryption_entries_;

-  ContentEncryption** encryption_entries_end_;

-  // ContentEncoding element names

-  unsigned long long encoding_order_;

-  unsigned long long encoding_scope_;

-  unsigned long long encoding_type_;

-  // LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncoding);

-  ContentEncoding(const ContentEncoding&);

-  ContentEncoding& operator=(const ContentEncoding&);

-};

-class Track {

-  Track(const Track&);

-  Track& operator=(const Track&);

- public:

-  class Info;

-  static long Create(Segment*, const Info&, long long element_start,

-                     long long element_size, Track*&);

-  enum Type { kVideo = 1, kAudio = 2, kSubtitle = 0x11, kMetadata = 0x21 };

-  Segment* const m_pSegment;

-  const long long m_element_start;

-  const long long m_element_size;

-  virtual ~Track();

-  long GetType() const;

-  long GetNumber() const;

-  unsigned long long GetUid() const;

-  const char* GetNameAsUTF8() const;

-  const char* GetLanguage() const;

-  const char* GetCodecNameAsUTF8() const;

-  const char* GetCodecId() const;

-  const unsigned char* GetCodecPrivate(size_t&) const;

-  bool GetLacing() const;

-  unsigned long long GetDefaultDuration() const;

-  unsigned long long GetCodecDelay() const;

-  unsigned long long GetSeekPreRoll() const;

-  const BlockEntry* GetEOS() const;

-  struct Settings {

-    long long start;

-    long long size;

-  };

-  class Info {

-   public:

-    Info();

-    ~Info();

-    int Copy(Info&) const;

-    void Clear();

-    long type;

-    long number;

-    unsigned long long uid;

-    unsigned long long defaultDuration;

-    unsigned long long codecDelay;

-    unsigned long long seekPreRoll;

-    char* nameAsUTF8;

-    char* language;

-    char* codecId;

-    char* codecNameAsUTF8;

-    unsigned char* codecPrivate;

-    size_t codecPrivateSize;

-    bool lacing;

-    Settings settings;

-   private:

-    Info(const Info&);

-    Info& operator=(const Info&);

-    int CopyStr(char* Info::*str, Info&) const;

-  };

-  long GetFirst(const BlockEntry*&) const;

-  long GetNext(const BlockEntry* pCurr, const BlockEntry*& pNext) const;

-  virtual bool VetEntry(const BlockEntry*) const;

-  virtual long Seek(long long time_ns, const BlockEntry*&) const;

-  const ContentEncoding* GetContentEncodingByIndex(unsigned long idx) const;

-  unsigned long GetContentEncodingCount() const;

-  long ParseContentEncodingsEntry(long long start, long long size);

- protected:

-  Track(Segment*, long long element_start, long long element_size);

-  Info m_info;

-  class EOSBlock : public BlockEntry {

-   public:

-    EOSBlock();

-    Kind GetKind() const;

-    const Block* GetBlock() const;

-  };

-  EOSBlock m_eos;

- private:

-  ContentEncoding** content_encoding_entries_;

-  ContentEncoding** content_encoding_entries_end_;

-};

-class VideoTrack : public Track {

-  VideoTrack(const VideoTrack&);

-  VideoTrack& operator=(const VideoTrack&);

-  VideoTrack(Segment*, long long element_start, long long element_size);

- public:

-  static long Parse(Segment*, const Info&, long long element_start,

-                    long long element_size, VideoTrack*&);

-  long long GetWidth() const;

-  long long GetHeight() const;

-  long long GetDisplayWidth() const;

-  long long GetDisplayHeight() const;

-  long long GetDisplayUnit() const;

-  long long GetStereoMode() const;

-  double GetFrameRate() const;

-  bool VetEntry(const BlockEntry*) const;

-  long Seek(long long time_ns, const BlockEntry*&) const;

- private:

-  long long m_width;

-  long long m_height;

-  long long m_display_width;

-  long long m_display_height;

-  long long m_display_unit;

-  long long m_stereo_mode;

-  double m_rate;

-};

-class AudioTrack : public Track {

-  AudioTrack(const AudioTrack&);

-  AudioTrack& operator=(const AudioTrack&);

-  AudioTrack(Segment*, long long element_start, long long element_size);

- public:

-  static long Parse(Segment*, const Info&, long long element_start,

-                    long long element_size, AudioTrack*&);

-  double GetSamplingRate() const;

-  long long GetChannels() const;

-  long long GetBitDepth() const;

- private:

-  double m_rate;

-  long long m_channels;

-  long long m_bitDepth;

-};

-class Tracks {

-  Tracks(const Tracks&);

-  Tracks& operator=(const Tracks&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  Tracks(Segment*, long long start, long long size, long long element_start,

-         long long element_size);

-  ~Tracks();

-  long Parse();

-  unsigned long GetTracksCount() const;

-  const Track* GetTrackByNumber(long tn) const;

-  const Track* GetTrackByIndex(unsigned long idx) const;

- private:

-  Track** m_trackEntries;

-  Track** m_trackEntriesEnd;

-  long ParseTrackEntry(long long payload_start, long long payload_size,

-                       long long element_start, long long element_size,

-                       Track*&) const;

-};

-class Chapters {

-  Chapters(const Chapters&);

-  Chapters& operator=(const Chapters&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  Chapters(Segment*, long long payload_start, long long payload_size,

-           long long element_start, long long element_size);

-  ~Chapters();

-  long Parse();

-  class Atom;

-  class Edition;

-  class Display {

-    friend class Atom;

-    Display();

-    Display(const Display&);

-    ~Display();

-    Display& operator=(const Display&);

-   public:

-    const char* GetString() const;

-    const char* GetLanguage() const;

-    const char* GetCountry() const;

-   private:

-    void Init();

-    void ShallowCopy(Display&) const;

-    void Clear();

-    long Parse(IMkvReader*, long long pos, long long size);

-    char* m_string;

-    char* m_language;

-    char* m_country;

-  };

-  class Atom {

-    friend class Edition;

-    Atom();

-    Atom(const Atom&);

-    ~Atom();

-    Atom& operator=(const Atom&);

-   public:

-    unsigned long long GetUID() const;

-    const char* GetStringUID() const;

-    long long GetStartTimecode() const;

-    long long GetStopTimecode() const;

-    long long GetStartTime(const Chapters*) const;

-    long long GetStopTime(const Chapters*) const;

-    int GetDisplayCount() const;

-    const Display* GetDisplay(int index) const;

-   private:

-    void Init();

-    void ShallowCopy(Atom&) const;

-    void Clear();

-    long Parse(IMkvReader*, long long pos, long long size);

-    static long long GetTime(const Chapters*, long long timecode);

-    long ParseDisplay(IMkvReader*, long long pos, long long size);

-    bool ExpandDisplaysArray();

-    char* m_string_uid;

-    unsigned long long m_uid;

-    long long m_start_timecode;

-    long long m_stop_timecode;

-    Display* m_displays;

-    int m_displays_size;

-    int m_displays_count;

-  };

-  class Edition {

-    friend class Chapters;

-    Edition();

-    Edition(const Edition&);

-    ~Edition();

-    Edition& operator=(const Edition&);

-   public:

-    int GetAtomCount() const;

-    const Atom* GetAtom(int index) const;

-   private:

-    void Init();

-    void ShallowCopy(Edition&) const;

-    void Clear();

-    long Parse(IMkvReader*, long long pos, long long size);

-    long ParseAtom(IMkvReader*, long long pos, long long size);

-    bool ExpandAtomsArray();

-    Atom* m_atoms;

-    int m_atoms_size;

-    int m_atoms_count;

-  };

-  int GetEditionCount() const;

-  const Edition* GetEdition(int index) const;

- private:

-  long ParseEdition(long long pos, long long size);

-  bool ExpandEditionsArray();

-  Edition* m_editions;

-  int m_editions_size;

-  int m_editions_count;

-};

-class Tags {

-  Tags(const Tags&);

-  Tags& operator=(const Tags&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  Tags(Segment*, long long payload_start, long long payload_size,

-       long long element_start, long long element_size);

-  ~Tags();

-  long Parse();

-  class Tag;

-  class SimpleTag;

-  class SimpleTag {

-    friend class Tag;

-    SimpleTag();

-    SimpleTag(const SimpleTag&);

-    ~SimpleTag();

-    SimpleTag& operator=(const SimpleTag&);

-   public:

-    const char* GetTagName() const;

-    const char* GetTagString() const;

-   private:

-    void Init();

-    void ShallowCopy(SimpleTag&) const;

-    void Clear();

-    long Parse(IMkvReader*, long long pos, long long size);

-    char* m_tag_name;

-    char* m_tag_string;

-  };

-  class Tag {

-    friend class Tags;

-    Tag();

-    Tag(const Tag&);

-    ~Tag();

-    Tag& operator=(const Tag&);

-   public:

-    int GetSimpleTagCount() const;

-    const SimpleTag* GetSimpleTag(int index) const;

-   private:

-    void Init();

-    void ShallowCopy(Tag&) const;

-    void Clear();

-    long Parse(IMkvReader*, long long pos, long long size);

-    long ParseSimpleTag(IMkvReader*, long long pos, long long size);

-    bool ExpandSimpleTagsArray();

-    SimpleTag* m_simple_tags;

-    int m_simple_tags_size;

-    int m_simple_tags_count;

-  };

-  int GetTagCount() const;

-  const Tag* GetTag(int index) const;

- private:

-  long ParseTag(long long pos, long long size);

-  bool ExpandTagsArray();

-  Tag* m_tags;

-  int m_tags_size;

-  int m_tags_count;

-};

-class SegmentInfo {

-  SegmentInfo(const SegmentInfo&);

-  SegmentInfo& operator=(const SegmentInfo&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  SegmentInfo(Segment*, long long start, long long size,

-              long long element_start, long long element_size);

-  ~SegmentInfo();

-  long Parse();

-  long long GetTimeCodeScale() const;

-  long long GetDuration() const;  // scaled

-  const char* GetMuxingAppAsUTF8() const;

-  const char* GetWritingAppAsUTF8() const;

-  const char* GetTitleAsUTF8() const;

- private:

-  long long m_timecodeScale;

-  double m_duration;

-  char* m_pMuxingAppAsUTF8;

-  char* m_pWritingAppAsUTF8;

-  char* m_pTitleAsUTF8;

-};

-class SeekHead {

-  SeekHead(const SeekHead&);

-  SeekHead& operator=(const SeekHead&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  SeekHead(Segment*, long long start, long long size, long long element_start,

-           long long element_size);

-  ~SeekHead();

-  long Parse();

-  struct Entry {

-    // the SeekHead entry payload

-    long long id;

-    long long pos;

-    // absolute pos of SeekEntry ID

-    long long element_start;

-    // SeekEntry ID size + size size + payload

-    long long element_size;

-  };

-  int GetCount() const;

-  const Entry* GetEntry(int idx) const;

-  struct VoidElement {

-    // absolute pos of Void ID

-    long long element_start;

-    // ID size + size size + payload size

-    long long element_size;

-  };

-  int GetVoidElementCount() const;

-  const VoidElement* GetVoidElement(int idx) const;

- private:

-  Entry* m_entries;

-  int m_entry_count;

-  VoidElement* m_void_elements;

-  int m_void_element_count;

-  static bool ParseEntry(IMkvReader*,

-                         long long pos,  // payload

-                         long long size, Entry*);

-};

-class Cues;

-class CuePoint {

-  friend class Cues;

-  CuePoint(long, long long);

-  ~CuePoint();

-  CuePoint(const CuePoint&);

-  CuePoint& operator=(const CuePoint&);

- public:

-  long long m_element_start;

-  long long m_element_size;

-  bool Load(IMkvReader*);

-  long long GetTimeCode() const;  // absolute but unscaled

-  long long GetTime(const Segment*) const;  // absolute and scaled (ns units)

-  struct TrackPosition {

-    long long m_track;

-    long long m_pos;  // of cluster

-    long long m_block;

-    // codec_state  //defaults to 0

-    // reference = clusters containing req'd referenced blocks

-    //  reftime = timecode of the referenced block

-    bool Parse(IMkvReader*, long long, long long);

-  };

-  const TrackPosition* Find(const Track*) const;

- private:

-  const long m_index;

-  long long m_timecode;

-  TrackPosition* m_track_positions;

-  size_t m_track_positions_count;

-};

-class Cues {

-  friend class Segment;

-  Cues(Segment*, long long start, long long size, long long element_start,

-       long long element_size);

-  ~Cues();

-  Cues(const Cues&);

-  Cues& operator=(const Cues&);

- public:

-  Segment* const m_pSegment;

-  const long long m_start;

-  const long long m_size;

-  const long long m_element_start;

-  const long long m_element_size;

-  bool Find(  // lower bound of time_ns

-      long long time_ns, const Track*, const CuePoint*&,

-      const CuePoint::TrackPosition*&) const;

-  const CuePoint* GetFirst() const;

-  const CuePoint* GetLast() const;

-  const CuePoint* GetNext(const CuePoint*) const;

-  const BlockEntry* GetBlock(const CuePoint*,

-                             const CuePoint::TrackPosition*) const;

-  bool LoadCuePoint() const;

-  long GetCount() const;  // loaded only

-  // long GetTotal() const;  //loaded + preloaded

-  bool DoneParsing() const;

- private:

-  bool Init() const;

-  bool PreloadCuePoint(long&, long long) const;

-  mutable CuePoint** m_cue_points;

-  mutable long m_count;

-  mutable long m_preload_count;

-  mutable long long m_pos;

-};

-class Cluster {

-  friend class Segment;

-  Cluster(const Cluster&);

-  Cluster& operator=(const Cluster&);

- public:

-  Segment* const m_pSegment;

- public:

-  static Cluster* Create(Segment*,

-                         long index,  // index in segment

-                         long long off);  // offset relative to segment

-  // long long element_size);

-  Cluster();  // EndOfStream

-  ~Cluster();

-  bool EOS() const;

-  long long GetTimeCode() const;  // absolute, but not scaled

-  long long GetTime() const;  // absolute, and scaled (nanosecond units)

-  long long GetFirstTime() const;  // time (ns) of first (earliest) block

-  long long GetLastTime() const;  // time (ns) of last (latest) block

-  long GetFirst(const BlockEntry*&) const;

-  long GetLast(const BlockEntry*&) const;

-  long GetNext(const BlockEntry* curr, const BlockEntry*& next) const;

-  const BlockEntry* GetEntry(const Track*, long long ns = -1) const;

-  const BlockEntry* GetEntry(const CuePoint&,

-                             const CuePoint::TrackPosition&) const;

-  // const BlockEntry* GetMaxKey(const VideoTrack*) const;

-  //    static bool HasBlockEntries(const Segment*, long long);

-  static long HasBlockEntries(const Segment*, long long idoff, long long& pos,

-                              long& size);

-  long GetEntryCount() const;

-  long Load(long long& pos, long& size) const;

-  long Parse(long long& pos, long& size) const;

-  long GetEntry(long index, const mkvparser::BlockEntry*&) const;

- protected:

-  Cluster(Segment*, long index, long long element_start);

-  // long long element_size);

- public:

-  const long long m_element_start;

-  long long GetPosition() const;  // offset relative to segment

-  long GetIndex() const;

-  long long GetElementSize() const;

-  // long long GetPayloadSize() const;

-  // long long Unparsed() const;

- private:

-  long m_index;

-  mutable long long m_pos;

-  // mutable long long m_size;

-  mutable long long m_element_size;

-  mutable long long m_timecode;

-  mutable BlockEntry** m_entries;

-  mutable long m_entries_size;

-  mutable long m_entries_count;

-  long ParseSimpleBlock(long long, long long&, long&);

-  long ParseBlockGroup(long long, long long&, long&);

-  long CreateBlock(long long id, long long pos, long long size,

-                   long long discard_padding);

-  long CreateBlockGroup(long long start_offset, long long size,

-                        long long discard_padding);

-  long CreateSimpleBlock(long long, long long);

-};

-class Segment {

-  friend class Cues;

-  friend class Track;

-  friend class VideoTrack;

-  Segment(const Segment&);

-  Segment& operator=(const Segment&);

- private:

-  Segment(IMkvReader*, long long elem_start,

-          // long long elem_size,

-          long long pos, long long size);

- public:

-  IMkvReader* const m_pReader;

-  const long long m_element_start;

-  // const long long m_element_size;

-  const long long m_start;  // posn of segment payload

-  const long long m_size;  // size of segment payload

-  Cluster m_eos;  // TODO: make private?

-  static long long CreateInstance(IMkvReader*, long long, Segment*&);

-  ~Segment();

-  long Load();  // loads headers and all clusters

-  // for incremental loading

-  // long long Unparsed() const;

-  bool DoneParsing() const;

-  long long ParseHeaders();  // stops when first cluster is found

-  // long FindNextCluster(long long& pos, long& size) const;

-  long LoadCluster(long long& pos, long& size);  // load one cluster

-  long LoadCluster();

-  long ParseNext(const Cluster* pCurr, const Cluster*& pNext, long long& pos,

-                 long& size);

-  const SeekHead* GetSeekHead() const;

-  const Tracks* GetTracks() const;

-  const SegmentInfo* GetInfo() const;

-  const Cues* GetCues() const;

-  const Chapters* GetChapters() const;

-  const Tags* GetTags() const;

-  long long GetDuration() const;

-  unsigned long GetCount() const;

-  const Cluster* GetFirst() const;

-  const Cluster* GetLast() const;

-  const Cluster* GetNext(const Cluster*);

-  const Cluster* FindCluster(long long time_nanoseconds) const;

-  // const BlockEntry* Seek(long long time_nanoseconds, const Track*) const;

-  const Cluster* FindOrPreloadCluster(long long pos);

-  long ParseCues(long long cues_off,  // offset relative to start of segment

-                 long long& parse_pos, long& parse_len);

- private:

-  long long m_pos;  // absolute file posn; what has been consumed so far

-  Cluster* m_pUnknownSize;

-  SeekHead* m_pSeekHead;

-  SegmentInfo* m_pInfo;

-  Tracks* m_pTracks;

-  Cues* m_pCues;

-  Chapters* m_pChapters;

-  Tags* m_pTags;

-  Cluster** m_clusters;

-  long m_clusterCount;  // number of entries for which m_index >= 0

-  long m_clusterPreloadCount;  // number of entries for which m_index < 0

-  long m_clusterSize;  // array size

-  long DoLoadCluster(long long&, long&);

-  long DoLoadClusterUnknownSize(long long&, long&);

-  long DoParseNext(const Cluster*&, long long&, long&);

-  bool AppendCluster(Cluster*);

-  bool PreloadCluster(Cluster*, ptrdiff_t);

-  // void ParseSeekHead(long long pos, long long size);

-  // void ParseSeekEntry(long long pos, long long size);

-  // void ParseCues(long long);

-  const BlockEntry* GetBlock(const CuePoint&, const CuePoint::TrackPosition&);

-};

-}  // end namespace mkvparser

-inline long mkvparser::Segment::LoadCluster() {

-  long long pos;

-  long size;

-  return LoadCluster(pos, size);

-}

-#endif  // MKVPARSER_HPP

--- /dev/null

+++ b/third_party/libwebm/mkvparser/mkvparser.cc

@@ -1,0 +1,7940 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "mkvparser/mkvparser.h"

+#if defined(_MSC_VER) && _MSC_VER < 1800

+#include <float.h>  // _isnan() / _finite()

+#define MSC_COMPAT

+#endif

+#include <cassert>

+#include <cfloat>

+#include <climits>

+#include <cmath>

+#include <cstring>

+#include <memory>

+#include <new>

+#include "common/webmids.h"

+namespace mkvparser {

+const float MasteringMetadata::kValueNotPresent = FLT_MAX;

+const long long Colour::kValueNotPresent = LLONG_MAX;

+#ifdef MSC_COMPAT

+inline bool isnan(double val) { return !!_isnan(val); }

+inline bool isinf(double val) { return !_finite(val); }

+#else

+inline bool isnan(double val) { return std::isnan(val); }

+inline bool isinf(double val) { return std::isinf(val); }

+#endif  // MSC_COMPAT

+IMkvReader::~IMkvReader() {}

+template <typename Type>

+Type* SafeArrayAlloc(unsigned long long num_elements,

+                     unsigned long long element_size) {

+  if (num_elements == 0 || element_size == 0)

+    return NULL;

+  const size_t kMaxAllocSize = 0x80000000;  // 2GiB

+  const unsigned long long num_bytes = num_elements * element_size;

+  if (element_size > (kMaxAllocSize / num_elements))

+    return NULL;

+  if (num_bytes != static_cast<size_t>(num_bytes))

+    return NULL;

+  return new (std::nothrow) Type[static_cast<size_t>(num_bytes)];

+}

+void GetVersion(int& major, int& minor, int& build, int& revision) {

+  major = 1;

+  minor = 0;

+  build = 0;

+  revision = 30;

+}

+long long ReadUInt(IMkvReader* pReader, long long pos, long& len) {

+  if (!pReader || pos < 0)

+    return E_FILE_FORMAT_INVALID;

+  len = 1;

+  unsigned char b;

+  int status = pReader->Read(pos, 1, &b);

+  if (status < 0)  // error or underflow

+    return status;

+  if (status > 0)  // interpreted as "underflow"

+    return E_BUFFER_NOT_FULL;

+  if (b == 0)  // we can't handle u-int values larger than 8 bytes

+    return E_FILE_FORMAT_INVALID;

+  unsigned char m = 0x80;

+  while (!(b & m)) {

+    m >>= 1;

+    ++len;

+  }

+  long long result = b & (~m);

+  ++pos;

+  for (int i = 1; i < len; ++i) {

+    status = pReader->Read(pos, 1, &b);

+    if (status < 0) {

+      len = 1;

+      return status;

+    }

+    if (status > 0) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result <<= 8;

+    result |= b;

+    ++pos;

+  }

+  return result;

+}

+// Reads an EBML ID and returns it.

+// An ID must at least 1 byte long, cannot exceed 4, and its value must be

+// greater than 0.

+// See known EBML values and EBMLMaxIDLength:

+// http://www.matroska.org/technical/specs/index.html

+// Returns the ID, or a value less than 0 to report an error while reading the

+// ID.

+long long ReadID(IMkvReader* pReader, long long pos, long& len) {

+  if (pReader == NULL || pos < 0)

+    return E_FILE_FORMAT_INVALID;

+  // Read the first byte. The length in bytes of the ID is determined by

+  // finding the first set bit in the first byte of the ID.

+  unsigned char temp_byte = 0;

+  int read_status = pReader->Read(pos, 1, &temp_byte);

+  if (read_status < 0)

+    return E_FILE_FORMAT_INVALID;

+  else if (read_status > 0)  // No data to read.

+    return E_BUFFER_NOT_FULL;

+  if (temp_byte == 0)  // ID length > 8 bytes; invalid file.

+    return E_FILE_FORMAT_INVALID;

+  int bit_pos = 0;

+  const int kMaxIdLengthInBytes = 4;

+  const int kCheckByte = 0x80;

+  // Find the first bit that's set.

+  bool found_bit = false;

+  for (; bit_pos < kMaxIdLengthInBytes; ++bit_pos) {

+    if ((kCheckByte >> bit_pos) & temp_byte) {

+      found_bit = true;

+      break;

+    }

+  }

+  if (!found_bit) {

+    // The value is too large to be a valid ID.

+    return E_FILE_FORMAT_INVALID;

+  }

+  // Read the remaining bytes of the ID (if any).

+  const int id_length = bit_pos + 1;

+  long long ebml_id = temp_byte;

+  for (int i = 1; i < id_length; ++i) {

+    ebml_id <<= 8;

+    read_status = pReader->Read(pos + i, 1, &temp_byte);

+    if (read_status < 0)

+      return E_FILE_FORMAT_INVALID;

+    else if (read_status > 0)

+      return E_BUFFER_NOT_FULL;

+    ebml_id |= temp_byte;

+  }

+  len = id_length;

+  return ebml_id;

+}

+long long GetUIntLength(IMkvReader* pReader, long long pos, long& len) {

+  if (!pReader || pos < 0)

+    return E_FILE_FORMAT_INVALID;

+  long long total, available;

+  int status = pReader->Length(&total, &available);

+  if (status < 0 || (total >= 0 && available > total))

+    return E_FILE_FORMAT_INVALID;

+  len = 1;

+  if (pos >= available)

+    return pos;  // too few bytes available

+  unsigned char b;

+  status = pReader->Read(pos, 1, &b);

+  if (status != 0)

+    return status;

+  if (b == 0)  // we can't handle u-int values larger than 8 bytes

+    return E_FILE_FORMAT_INVALID;

+  unsigned char m = 0x80;

+  while (!(b & m)) {

+    m >>= 1;

+    ++len;

+  }

+  return 0;  // success

+}

+// TODO(vigneshv): This function assumes that unsigned values never have their

+// high bit set.

+long long UnserializeUInt(IMkvReader* pReader, long long pos, long long size) {

+  if (!pReader || pos < 0 || (size <= 0) || (size > 8))

+    return E_FILE_FORMAT_INVALID;

+  long long result = 0;

+  for (long long i = 0; i < size; ++i) {

+    unsigned char b;

+    const long status = pReader->Read(pos, 1, &b);

+    if (status < 0)

+      return status;

+    result <<= 8;

+    result |= b;

+    ++pos;

+  }

+  return result;

+}

+long UnserializeFloat(IMkvReader* pReader, long long pos, long long size_,

+                      double& result) {

+  if (!pReader || pos < 0 || ((size_ != 4) && (size_ != 8)))

+    return E_FILE_FORMAT_INVALID;

+  const long size = static_cast<long>(size_);

+  unsigned char buf[8];

+  const int status = pReader->Read(pos, size, buf);

+  if (status < 0)  // error

+    return status;

+  if (size == 4) {

+    union {

+      float f;

+      unsigned long ff;

+    };

+    ff = 0;

+    for (int i = 0;;) {

+      ff |= buf[i];

+      if (++i >= 4)

+        break;

+      ff <<= 8;

+    }

+    result = f;

+  } else {

+    union {

+      double d;

+      unsigned long long dd;

+    };

+    dd = 0;

+    for (int i = 0;;) {

+      dd |= buf[i];

+      if (++i >= 8)

+        break;

+      dd <<= 8;

+    }

+    result = d;

+  }

+  if (mkvparser::isinf(result) || mkvparser::isnan(result))

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long UnserializeInt(IMkvReader* pReader, long long pos, long long size,

+                    long long& result_ref) {

+  if (!pReader || pos < 0 || size < 1 || size > 8)

+    return E_FILE_FORMAT_INVALID;

+  signed char first_byte = 0;

+  const long status = pReader->Read(pos, 1, (unsigned char*)&first_byte);

+  if (status < 0)

+    return status;

+  unsigned long long result = first_byte;

+  ++pos;

+  for (long i = 1; i < size; ++i) {

+    unsigned char b;

+    const long status = pReader->Read(pos, 1, &b);

+    if (status < 0)

+      return status;

+    result <<= 8;

+    result |= b;

+    ++pos;

+  }

+  result_ref = static_cast<long long>(result);

+  return 0;

+}

+long UnserializeString(IMkvReader* pReader, long long pos, long long size,

+                       char*& str) {

+  delete[] str;

+  str = NULL;

+  if (size >= LONG_MAX || size < 0)

+    return E_FILE_FORMAT_INVALID;

+  // +1 for '\0' terminator

+  const long required_size = static_cast<long>(size) + 1;

+  str = SafeArrayAlloc<char>(1, required_size);

+  if (str == NULL)

+    return E_FILE_FORMAT_INVALID;

+  unsigned char* const buf = reinterpret_cast<unsigned char*>(str);

+  const long status = pReader->Read(pos, static_cast<long>(size), buf);

+  if (status) {

+    delete[] str;

+    str = NULL;

+    return status;

+  }

+  str[required_size - 1] = '\0';

+  return 0;

+}

+long ParseElementHeader(IMkvReader* pReader, long long& pos, long long stop,

+                        long long& id, long long& size) {

+  if (stop >= 0 && pos >= stop)

+    return E_FILE_FORMAT_INVALID;

+  long len;

+  id = ReadID(pReader, pos, len);

+  if (id < 0)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume id

+  if (stop >= 0 && pos >= stop)

+    return E_FILE_FORMAT_INVALID;

+  size = ReadUInt(pReader, pos, len);

+  if (size < 0 || len < 1 || len > 8) {

+    // Invalid: Negative payload size, negative or 0 length integer, or integer

+    // larger than 64 bits (libwebm cannot handle them).

+    return E_FILE_FORMAT_INVALID;

+  }

+  // Avoid rolling over pos when very close to LLONG_MAX.

+  const unsigned long long rollover_check =

+      static_cast<unsigned long long>(pos) + len;

+  if (rollover_check > LLONG_MAX)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume length of size

+  // pos now designates payload

+  if (stop >= 0 && pos > stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;  // success

+}

+bool Match(IMkvReader* pReader, long long& pos, unsigned long expected_id,

+           long long& val) {

+  if (!pReader || pos < 0)

+    return false;

+  long long total = 0;

+  long long available = 0;

+  const long status = pReader->Length(&total, &available);

+  if (status < 0 || (total >= 0 && available > total))

+    return false;

+  long len = 0;

+  const long long id = ReadID(pReader, pos, len);

+  if (id < 0 || (available - pos) > len)

+    return false;

+  if (static_cast<unsigned long>(id) != expected_id)

+    return false;

+  pos += len;  // consume id

+  const long long size = ReadUInt(pReader, pos, len);

+  if (size < 0 || size > 8 || len < 1 || len > 8 || (available - pos) > len)

+    return false;

+  pos += len;  // consume length of size of payload

+  val = UnserializeUInt(pReader, pos, size);

+  if (val < 0)

+    return false;

+  pos += size;  // consume size of payload

+  return true;

+}

+bool Match(IMkvReader* pReader, long long& pos, unsigned long expected_id,

+           unsigned char*& buf, size_t& buflen) {

+  if (!pReader || pos < 0)

+    return false;

+  long long total = 0;

+  long long available = 0;

+  long status = pReader->Length(&total, &available);

+  if (status < 0 || (total >= 0 && available > total))

+    return false;

+  long len = 0;

+  const long long id = ReadID(pReader, pos, len);

+  if (id < 0 || (available - pos) > len)

+    return false;

+  if (static_cast<unsigned long>(id) != expected_id)

+    return false;

+  pos += len;  // consume id

+  const long long size = ReadUInt(pReader, pos, len);

+  if (size < 0 || len <= 0 || len > 8 || (available - pos) > len)

+    return false;

+  unsigned long long rollover_check =

+      static_cast<unsigned long long>(pos) + len;

+  if (rollover_check > LLONG_MAX)

+    return false;

+  pos += len;  // consume length of size of payload

+  rollover_check = static_cast<unsigned long long>(pos) + size;

+  if (rollover_check > LLONG_MAX)

+    return false;

+  if ((pos + size) > available)

+    return false;

+  if (size >= LONG_MAX)

+    return false;

+  const long buflen_ = static_cast<long>(size);

+  buf = SafeArrayAlloc<unsigned char>(1, buflen_);

+  if (!buf)

+    return false;

+  status = pReader->Read(pos, buflen_, buf);

+  if (status != 0)

+    return false;

+  buflen = buflen_;

+  pos += size;  // consume size of payload

+  return true;

+}

+EBMLHeader::EBMLHeader() : m_docType(NULL) { Init(); }

+EBMLHeader::~EBMLHeader() { delete[] m_docType; }

+void EBMLHeader::Init() {

+  m_version = 1;

+  m_readVersion = 1;

+  m_maxIdLength = 4;

+  m_maxSizeLength = 8;

+  if (m_docType) {

+    delete[] m_docType;

+    m_docType = NULL;

+  }

+  m_docTypeVersion = 1;

+  m_docTypeReadVersion = 1;

+}

+long long EBMLHeader::Parse(IMkvReader* pReader, long long& pos) {

+  if (!pReader)

+    return E_FILE_FORMAT_INVALID;

+  long long total, available;

+  long status = pReader->Length(&total, &available);

+  if (status < 0)  // error

+    return status;

+  pos = 0;

+  // Scan until we find what looks like the first byte of the EBML header.

+  const long long kMaxScanBytes = (available >= 1024) ? 1024 : available;

+  const unsigned char kEbmlByte0 = 0x1A;

+  unsigned char scan_byte = 0;

+  while (pos < kMaxScanBytes) {

+    status = pReader->Read(pos, 1, &scan_byte);

+    if (status < 0)  // error

+      return status;

+    else if (status > 0)

+      return E_BUFFER_NOT_FULL;

+    if (scan_byte == kEbmlByte0)

+      break;

+    ++pos;

+  }

+  long len = 0;

+  const long long ebml_id = ReadID(pReader, pos, len);

+  if (ebml_id == E_BUFFER_NOT_FULL)

+    return E_BUFFER_NOT_FULL;

+  if (len != 4 || ebml_id != libwebm::kMkvEBML)

+    return E_FILE_FORMAT_INVALID;

+  // Move read pos forward to the EBML header size field.

+  pos += 4;

+  // Read length of size field.

+  long long result = GetUIntLength(pReader, pos, len);

+  if (result < 0)  // error

+    return E_FILE_FORMAT_INVALID;

+  else if (result > 0)  // need more data

+    return E_BUFFER_NOT_FULL;

+  if (len < 1 || len > 8)

+    return E_FILE_FORMAT_INVALID;

+  if ((total >= 0) && ((total - pos) < len))

+    return E_FILE_FORMAT_INVALID;

+  if ((available - pos) < len)

+    return pos + len;  // try again later

+  // Read the EBML header size.

+  result = ReadUInt(pReader, pos, len);

+  if (result < 0)  // error

+    return result;

+  pos += len;  // consume size field

+  // pos now designates start of payload

+  if ((total >= 0) && ((total - pos) < result))

+    return E_FILE_FORMAT_INVALID;

+  if ((available - pos) < result)

+    return pos + result;

+  const long long end = pos + result;

+  Init();

+  while (pos < end) {

+    long long id, size;

+    status = ParseElementHeader(pReader, pos, end, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)

+      return E_FILE_FORMAT_INVALID;

+    if (id == libwebm::kMkvEBMLVersion) {

+      m_version = UnserializeUInt(pReader, pos, size);

+      if (m_version <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvEBMLReadVersion) {

+      m_readVersion = UnserializeUInt(pReader, pos, size);

+      if (m_readVersion <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvEBMLMaxIDLength) {

+      m_maxIdLength = UnserializeUInt(pReader, pos, size);

+      if (m_maxIdLength <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvEBMLMaxSizeLength) {

+      m_maxSizeLength = UnserializeUInt(pReader, pos, size);

+      if (m_maxSizeLength <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDocType) {

+      if (m_docType)

+        return E_FILE_FORMAT_INVALID;

+      status = UnserializeString(pReader, pos, size, m_docType);

+      if (status)  // error

+        return status;

+    } else if (id == libwebm::kMkvDocTypeVersion) {

+      m_docTypeVersion = UnserializeUInt(pReader, pos, size);

+      if (m_docTypeVersion <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDocTypeReadVersion) {

+      m_docTypeReadVersion = UnserializeUInt(pReader, pos, size);

+      if (m_docTypeReadVersion <= 0)

+        return E_FILE_FORMAT_INVALID;

+    }

+    pos += size;

+  }

+  if (pos != end)

+    return E_FILE_FORMAT_INVALID;

+  // Make sure DocType, DocTypeReadVersion, and DocTypeVersion are valid.

+  if (m_docType == NULL || m_docTypeReadVersion <= 0 || m_docTypeVersion <= 0)

+    return E_FILE_FORMAT_INVALID;

+  // Make sure EBMLMaxIDLength and EBMLMaxSizeLength are valid.

+  if (m_maxIdLength <= 0 || m_maxIdLength > 4 || m_maxSizeLength <= 0 ||

+      m_maxSizeLength > 8)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+Segment::Segment(IMkvReader* pReader, long long elem_start,

+                 // long long elem_size,

+                 long long start, long long size)

+    : m_pReader(pReader),

+      m_element_start(elem_start),

+      // m_element_size(elem_size),

+      m_start(start),

+      m_size(size),

+      m_pos(start),

+      m_pUnknownSize(0),

+      m_pSeekHead(NULL),

+      m_pInfo(NULL),

+      m_pTracks(NULL),

+      m_pCues(NULL),

+      m_pChapters(NULL),

+      m_pTags(NULL),

+      m_clusters(NULL),

+      m_clusterCount(0),

+      m_clusterPreloadCount(0),

+      m_clusterSize(0) {}

+Segment::~Segment() {

+  const long count = m_clusterCount + m_clusterPreloadCount;

+  Cluster** i = m_clusters;

+  Cluster** j = m_clusters + count;

+  while (i != j) {

+    Cluster* const p = *i++;

+    delete p;

+  }

+  delete[] m_clusters;

+  delete m_pTracks;

+  delete m_pInfo;

+  delete m_pCues;

+  delete m_pChapters;

+  delete m_pTags;

+  delete m_pSeekHead;

+}

+long long Segment::CreateInstance(IMkvReader* pReader, long long pos,

+                                  Segment*& pSegment) {

+  if (pReader == NULL || pos < 0)

+    return E_PARSE_FAILED;

+  pSegment = NULL;

+  long long total, available;

+  const long status = pReader->Length(&total, &available);

+  if (status < 0)  // error

+    return status;

+  if (available < 0)

+    return -1;

+  if ((total >= 0) && (available > total))

+    return -1;

+  // I would assume that in practice this loop would execute

+  // exactly once, but we allow for other elements (e.g. Void)

+  // to immediately follow the EBML header.  This is fine for

+  // the source filter case (since the entire file is available),

+  // but in the splitter case over a network we should probably

+  // just give up early.  We could for example decide only to

+  // execute this loop a maximum of, say, 10 times.

+  // TODO:

+  // There is an implied "give up early" by only parsing up

+  // to the available limit.  We do do that, but only if the

+  // total file size is unknown.  We could decide to always

+  // use what's available as our limit (irrespective of whether

+  // we happen to know the total file length).  This would have

+  // as its sense "parse this much of the file before giving up",

+  // which a slightly different sense from "try to parse up to

+  // 10 EMBL elements before giving up".

+  for (;;) {

+    if ((total >= 0) && (pos >= total))

+      return E_FILE_FORMAT_INVALID;

+    // Read ID

+    long len;

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result)  // error, or too few available bytes

+      return result;

+    if ((total >= 0) && ((pos + len) > total))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > available)

+      return pos + len;

+    const long long idpos = pos;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume ID

+    // Read Size

+    result = GetUIntLength(pReader, pos, len);

+    if (result)  // error, or too few available bytes

+      return result;

+    if ((total >= 0) && ((pos + len) > total))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > available)

+      return pos + len;

+    long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return size;

+    pos += len;  // consume length of size of element

+    // Pos now points to start of payload

+    // Handle "unknown size" for live streaming of webm files.

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (id == libwebm::kMkvSegment) {

+      if (size == unknown_size)

+        size = -1;

+      else if (total < 0)

+        size = -1;

+      else if ((pos + size) > total)

+        size = -1;

+      pSegment = new (std::nothrow) Segment(pReader, idpos, pos, size);

+      if (pSegment == NULL)

+        return E_PARSE_FAILED;

+      return 0;  // success

+    }

+    if (size == unknown_size)

+      return E_FILE_FORMAT_INVALID;

+    if ((total >= 0) && ((pos + size) > total))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + size) > available)

+      return pos + size;

+    pos += size;  // consume payload

+  }

+}

+long long Segment::ParseHeaders() {

+  // Outermost (level 0) segment object has been constructed,

+  // and pos designates start of payload.  We need to find the

+  // inner (level 1) elements.

+  long long total, available;

+  const int status = m_pReader->Length(&total, &available);

+  if (status < 0)  // error

+    return status;

+  if (total > 0 && available > total)

+    return E_FILE_FORMAT_INVALID;

+  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

+  if ((segment_stop >= 0 && total >= 0 && segment_stop > total) ||

+      (segment_stop >= 0 && m_pos > segment_stop)) {

+    return E_FILE_FORMAT_INVALID;

+  }

+  for (;;) {

+    if ((total >= 0) && (m_pos >= total))

+      break;

+    if ((segment_stop >= 0) && (m_pos >= segment_stop))

+      break;

+    long long pos = m_pos;

+    const long long element_start = pos;

+    // Avoid rolling over pos when very close to LLONG_MAX.

+    unsigned long long rollover_check = pos + 1ULL;

+    if (rollover_check > LLONG_MAX)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + 1) > available)

+      return (pos + 1);

+    long len;

+    long long result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return result;

+    if (result > 0) {

+      // MkvReader doesn't have enough data to satisfy this read attempt.

+      return (pos + 1);

+    }

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > available)

+      return pos + len;

+    const long long idpos = pos;

+    const long long id = ReadID(m_pReader, idpos, len);

+    if (id < 0)

+      return E_FILE_FORMAT_INVALID;

+    if (id == libwebm::kMkvCluster)

+      break;

+    pos += len;  // consume ID

+    if ((pos + 1) > available)

+      return (pos + 1);

+    // Read Size

+    result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return result;

+    if (result > 0) {

+      // MkvReader doesn't have enough data to satisfy this read attempt.

+      return (pos + 1);

+    }

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > available)

+      return pos + len;

+    const long long size = ReadUInt(m_pReader, pos, len);

+    if (size < 0 || len < 1 || len > 8) {

+      // TODO(tomfinegan): ReadUInt should return an error when len is < 1 or

+      // len > 8 is true instead of checking this _everywhere_.

+      return size;

+    }

+    pos += len;  // consume length of size of element

+    // Avoid rolling over pos when very close to LLONG_MAX.

+    rollover_check = static_cast<unsigned long long>(pos) + size;

+    if (rollover_check > LLONG_MAX)

+      return E_FILE_FORMAT_INVALID;

+    const long long element_size = size + pos - element_start;

+    // Pos now points to start of payload

+    if ((segment_stop >= 0) && ((pos + size) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    // We read EBML elements either in total or nothing at all.

+    if ((pos + size) > available)

+      return pos + size;

+    if (id == libwebm::kMkvInfo) {

+      if (m_pInfo)

+        return E_FILE_FORMAT_INVALID;

+      m_pInfo = new (std::nothrow)

+          SegmentInfo(this, pos, size, element_start, element_size);

+      if (m_pInfo == NULL)

+        return -1;

+      const long status = m_pInfo->Parse();

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvTracks) {

+      if (m_pTracks)

+        return E_FILE_FORMAT_INVALID;

+      m_pTracks = new (std::nothrow)

+          Tracks(this, pos, size, element_start, element_size);

+      if (m_pTracks == NULL)

+        return -1;

+      const long status = m_pTracks->Parse();

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvCues) {

+      if (m_pCues == NULL) {

+        m_pCues = new (std::nothrow)

+            Cues(this, pos, size, element_start, element_size);

+        if (m_pCues == NULL)

+          return -1;

+      }

+    } else if (id == libwebm::kMkvSeekHead) {

+      if (m_pSeekHead == NULL) {

+        m_pSeekHead = new (std::nothrow)

+            SeekHead(this, pos, size, element_start, element_size);

+        if (m_pSeekHead == NULL)

+          return -1;

+        const long status = m_pSeekHead->Parse();

+        if (status)

+          return status;

+      }

+    } else if (id == libwebm::kMkvChapters) {

+      if (m_pChapters == NULL) {

+        m_pChapters = new (std::nothrow)

+            Chapters(this, pos, size, element_start, element_size);

+        if (m_pChapters == NULL)

+          return -1;

+        const long status = m_pChapters->Parse();

+        if (status)

+          return status;

+      }

+    } else if (id == libwebm::kMkvTags) {

+      if (m_pTags == NULL) {

+        m_pTags = new (std::nothrow)

+            Tags(this, pos, size, element_start, element_size);

+        if (m_pTags == NULL)

+          return -1;

+        const long status = m_pTags->Parse();

+        if (status)

+          return status;

+      }

+    }

+    m_pos = pos + size;  // consume payload

+  }

+  if (segment_stop >= 0 && m_pos > segment_stop)

+    return E_FILE_FORMAT_INVALID;

+  if (m_pInfo == NULL)  // TODO: liberalize this behavior

+    return E_FILE_FORMAT_INVALID;

+  if (m_pTracks == NULL)

+    return E_FILE_FORMAT_INVALID;

+  return 0;  // success

+}

+long Segment::LoadCluster(long long& pos, long& len) {

+  for (;;) {

+    const long result = DoLoadCluster(pos, len);

+    if (result <= 1)

+      return result;

+  }

+}

+long Segment::DoLoadCluster(long long& pos, long& len) {

+  if (m_pos < 0)

+    return DoLoadClusterUnknownSize(pos, len);

+  long long total, avail;

+  long status = m_pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  if (total >= 0 && avail > total)

+    return E_FILE_FORMAT_INVALID;

+  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

+  long long cluster_off = -1;  // offset relative to start of segment

+  long long cluster_size = -1;  // size of cluster payload

+  for (;;) {

+    if ((total >= 0) && (m_pos >= total))

+      return 1;  // no more clusters

+    if ((segment_stop >= 0) && (m_pos >= segment_stop))

+      return 1;  // no more clusters

+    pos = m_pos;

+    // Read ID

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long idpos = pos;

+    const long long id = ReadID(m_pReader, idpos, len);

+    if (id < 0)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume ID

+    // Read Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(m_pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    pos += len;  // consume length of size of element

+    // pos now points to start of payload

+    if (size == 0) {

+      // Missing element payload: move on.

+      m_pos = pos;

+      continue;

+    }

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if ((segment_stop >= 0) && (size != unknown_size) &&

+        ((pos + size) > segment_stop)) {

+      return E_FILE_FORMAT_INVALID;

+    }

+    if (id == libwebm::kMkvCues) {

+      if (size == unknown_size) {

+        // Cues element of unknown size: Not supported.

+        return E_FILE_FORMAT_INVALID;

+      }

+      if (m_pCues == NULL) {

+        const long long element_size = (pos - idpos) + size;

+        m_pCues = new (std::nothrow) Cues(this, pos, size, idpos, element_size);

+        if (m_pCues == NULL)

+          return -1;

+      }

+      m_pos = pos + size;  // consume payload

+      continue;

+    }

+    if (id != libwebm::kMkvCluster) {

+      // Besides the Segment, Libwebm allows only cluster elements of unknown

+      // size. Fail the parse upon encountering a non-cluster element reporting

+      // unknown size.

+      if (size == unknown_size)

+        return E_FILE_FORMAT_INVALID;

+      m_pos = pos + size;  // consume payload

+      continue;

+    }

+    // We have a cluster.

+    cluster_off = idpos - m_start;  // relative pos

+    if (size != unknown_size)

+      cluster_size = size;

+    break;

+  }

+  if (cluster_off < 0) {

+    // No cluster, die.

+    return E_FILE_FORMAT_INVALID;

+  }

+  long long pos_;

+  long len_;

+  status = Cluster::HasBlockEntries(this, cluster_off, pos_, len_);

+  if (status < 0) {  // error, or underflow

+    pos = pos_;

+    len = len_;

+    return status;

+  }

+  // status == 0 means "no block entries found"

+  // status > 0 means "found at least one block entry"

+  // TODO:

+  // The issue here is that the segment increments its own

+  // pos ptr past the most recent cluster parsed, and then

+  // starts from there to parse the next cluster.  If we

+  // don't know the size of the current cluster, then we

+  // must either parse its payload (as we do below), looking

+  // for the cluster (or cues) ID to terminate the parse.

+  // This isn't really what we want: rather, we really need

+  // a way to create the curr cluster object immediately.

+  // The pity is that cluster::parse can determine its own

+  // boundary, and we largely duplicate that same logic here.

+  //

+  // Maybe we need to get rid of our look-ahead preloading

+  // in source::parse???

+  //

+  // As we're parsing the blocks in the curr cluster

+  //(in cluster::parse), we should have some way to signal

+  // to the segment that we have determined the boundary,

+  // so it can adjust its own segment::m_pos member.

+  //

+  // The problem is that we're asserting in asyncreadinit,

+  // because we adjust the pos down to the curr seek pos,

+  // and the resulting adjusted len is > 2GB.  I'm suspicious

+  // that this is even correct, but even if it is, we can't

+  // be loading that much data in the cache anyway.

+  const long idx = m_clusterCount;

+  if (m_clusterPreloadCount > 0) {

+    if (idx >= m_clusterSize)

+      return E_FILE_FORMAT_INVALID;

+    Cluster* const pCluster = m_clusters[idx];

+    if (pCluster == NULL || pCluster->m_index >= 0)

+      return E_FILE_FORMAT_INVALID;

+    const long long off = pCluster->GetPosition();

+    if (off < 0)

+      return E_FILE_FORMAT_INVALID;

+    if (off == cluster_off) {  // preloaded already

+      if (status == 0)  // no entries found

+        return E_FILE_FORMAT_INVALID;

+      if (cluster_size >= 0)

+        pos += cluster_size;

+      else {

+        const long long element_size = pCluster->GetElementSize();

+        if (element_size <= 0)

+          return E_FILE_FORMAT_INVALID;  // TODO: handle this case

+        pos = pCluster->m_element_start + element_size;

+      }

+      pCluster->m_index = idx;  // move from preloaded to loaded

+      ++m_clusterCount;

+      --m_clusterPreloadCount;

+      m_pos = pos;  // consume payload

+      if (segment_stop >= 0 && m_pos > segment_stop)

+        return E_FILE_FORMAT_INVALID;

+      return 0;  // success

+    }

+  }

+  if (status == 0) {  // no entries found

+    if (cluster_size >= 0)

+      pos += cluster_size;

+    if ((total >= 0) && (pos >= total)) {

+      m_pos = total;

+      return 1;  // no more clusters

+    }

+    if ((segment_stop >= 0) && (pos >= segment_stop)) {

+      m_pos = segment_stop;

+      return 1;  // no more clusters

+    }

+    m_pos = pos;

+    return 2;  // try again

+  }

+  // status > 0 means we have an entry

+  Cluster* const pCluster = Cluster::Create(this, idx, cluster_off);

+  if (pCluster == NULL)

+    return -1;

+  if (!AppendCluster(pCluster)) {

+    delete pCluster;

+    return -1;

+  }

+  if (cluster_size >= 0) {

+    pos += cluster_size;

+    m_pos = pos;

+    if (segment_stop > 0 && m_pos > segment_stop)

+      return E_FILE_FORMAT_INVALID;

+    return 0;

+  }

+  m_pUnknownSize = pCluster;

+  m_pos = -pos;

+  return 0;  // partial success, since we have a new cluster

+  // status == 0 means "no block entries found"

+  // pos designates start of payload

+  // m_pos has NOT been adjusted yet (in case we need to come back here)

+}

+long Segment::DoLoadClusterUnknownSize(long long& pos, long& len) {

+  if (m_pos >= 0 || m_pUnknownSize == NULL)

+    return E_PARSE_FAILED;

+  const long status = m_pUnknownSize->Parse(pos, len);

+  if (status < 0)  // error or underflow

+    return status;

+  if (status == 0)  // parsed a block

+    return 2;  // continue parsing

+  const long long start = m_pUnknownSize->m_element_start;

+  const long long size = m_pUnknownSize->GetElementSize();

+  if (size < 0)

+    return E_FILE_FORMAT_INVALID;

+  pos = start + size;

+  m_pos = pos;

+  m_pUnknownSize = 0;

+  return 2;  // continue parsing

+}

+bool Segment::AppendCluster(Cluster* pCluster) {

+  if (pCluster == NULL || pCluster->m_index < 0)

+    return false;

+  const long count = m_clusterCount + m_clusterPreloadCount;

+  long& size = m_clusterSize;

+  const long idx = pCluster->m_index;

+  if (size < count || idx != m_clusterCount)

+    return false;

+  if (count >= size) {

+    const long n = (size <= 0) ? 2048 : 2 * size;

+    Cluster** const qq = new (std::nothrow) Cluster*[n];

+    if (qq == NULL)

+      return false;

+    Cluster** q = qq;

+    Cluster** p = m_clusters;

+    Cluster** const pp = p + count;

+    while (p != pp)

+      *q++ = *p++;

+    delete[] m_clusters;

+    m_clusters = qq;

+    size = n;

+  }

+  if (m_clusterPreloadCount > 0) {

+    Cluster** const p = m_clusters + m_clusterCount;

+    if (*p == NULL || (*p)->m_index >= 0)

+      return false;

+    Cluster** q = p + m_clusterPreloadCount;

+    if (q >= (m_clusters + size))

+      return false;

+    for (;;) {

+      Cluster** const qq = q - 1;

+      if ((*qq)->m_index >= 0)

+        return false;

+      *q = *qq;

+      q = qq;

+      if (q == p)

+        break;

+    }

+  }

+  m_clusters[idx] = pCluster;

+  ++m_clusterCount;

+  return true;

+}

+bool Segment::PreloadCluster(Cluster* pCluster, ptrdiff_t idx) {

+  if (pCluster == NULL || pCluster->m_index >= 0 || idx < m_clusterCount)

+    return false;

+  const long count = m_clusterCount + m_clusterPreloadCount;

+  long& size = m_clusterSize;

+  if (size < count)

+    return false;

+  if (count >= size) {

+    const long n = (size <= 0) ? 2048 : 2 * size;

+    Cluster** const qq = new (std::nothrow) Cluster*[n];

+    if (qq == NULL)

+      return false;

+    Cluster** q = qq;

+    Cluster** p = m_clusters;

+    Cluster** const pp = p + count;

+    while (p != pp)

+      *q++ = *p++;

+    delete[] m_clusters;

+    m_clusters = qq;

+    size = n;

+  }

+  if (m_clusters == NULL)

+    return false;

+  Cluster** const p = m_clusters + idx;

+  Cluster** q = m_clusters + count;

+  if (q < p || q >= (m_clusters + size))

+    return false;

+  while (q > p) {

+    Cluster** const qq = q - 1;

+    if ((*qq)->m_index >= 0)

+      return false;

+    *q = *qq;

+    q = qq;

+  }

+  m_clusters[idx] = pCluster;

+  ++m_clusterPreloadCount;

+  return true;

+}

+long Segment::Load() {

+  if (m_clusters != NULL || m_clusterSize != 0 || m_clusterCount != 0)

+    return E_PARSE_FAILED;

+  // Outermost (level 0) segment object has been constructed,

+  // and pos designates start of payload.  We need to find the

+  // inner (level 1) elements.

+  const long long header_status = ParseHeaders();

+  if (header_status < 0)  // error

+    return static_cast<long>(header_status);

+  if (header_status > 0)  // underflow

+    return E_BUFFER_NOT_FULL;

+  if (m_pInfo == NULL || m_pTracks == NULL)

+    return E_FILE_FORMAT_INVALID;

+  for (;;) {

+    const int status = LoadCluster();

+    if (status < 0)  // error

+      return status;

+    if (status >= 1)  // no more clusters

+      return 0;

+  }

+}

+SeekHead::SeekHead(Segment* pSegment, long long start, long long size_,

+                   long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_start(start),

+      m_size(size_),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_entries(0),

+      m_entry_count(0),

+      m_void_elements(0),

+      m_void_element_count(0) {}

+SeekHead::~SeekHead() {

+  delete[] m_entries;

+  delete[] m_void_elements;

+}

+long SeekHead::Parse() {

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = m_start;

+  const long long stop = m_start + m_size;

+  // first count the seek head entries

+  int entry_count = 0;

+  int void_element_count = 0;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvSeek)

+      ++entry_count;

+    else if (id == libwebm::kMkvVoid)

+      ++void_element_count;

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  m_entries = new (std::nothrow) Entry[entry_count];

+  if (m_entries == NULL)

+    return -1;

+  m_void_elements = new (std::nothrow) VoidElement[void_element_count];

+  if (m_void_elements == NULL)

+    return -1;

+  // now parse the entries and void elements

+  Entry* pEntry = m_entries;

+  VoidElement* pVoidElement = m_void_elements;

+  pos = m_start;

+  while (pos < stop) {

+    const long long idpos = pos;

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvSeek) {

+      if (ParseEntry(pReader, pos, size, pEntry)) {

+        Entry& e = *pEntry++;

+        e.element_start = idpos;

+        e.element_size = (pos + size) - idpos;

+      }

+    } else if (id == libwebm::kMkvVoid) {

+      VoidElement& e = *pVoidElement++;

+      e.element_start = idpos;

+      e.element_size = (pos + size) - idpos;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  ptrdiff_t count_ = ptrdiff_t(pEntry - m_entries);

+  assert(count_ >= 0);

+  assert(count_ <= entry_count);

+  m_entry_count = static_cast<int>(count_);

+  count_ = ptrdiff_t(pVoidElement - m_void_elements);

+  assert(count_ >= 0);

+  assert(count_ <= void_element_count);

+  m_void_element_count = static_cast<int>(count_);

+  return 0;

+}

+int SeekHead::GetCount() const { return m_entry_count; }

+const SeekHead::Entry* SeekHead::GetEntry(int idx) const {

+  if (idx < 0)

+    return 0;

+  if (idx >= m_entry_count)

+    return 0;

+  return m_entries + idx;

+}

+int SeekHead::GetVoidElementCount() const { return m_void_element_count; }

+const SeekHead::VoidElement* SeekHead::GetVoidElement(int idx) const {

+  if (idx < 0)

+    return 0;

+  if (idx >= m_void_element_count)

+    return 0;

+  return m_void_elements + idx;

+}

+long Segment::ParseCues(long long off, long long& pos, long& len) {

+  if (m_pCues)

+    return 0;  // success

+  if (off < 0)

+    return -1;

+  long long total, avail;

+  const int status = m_pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  pos = m_start + off;

+  if ((total < 0) || (pos >= total))

+    return 1;  // don't bother parsing cues

+  const long long element_start = pos;

+  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  long long result = GetUIntLength(m_pReader, pos, len);

+  if (result < 0)  // error

+    return static_cast<long>(result);

+  if (result > 0)  // underflow (weird)

+  {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + len) > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long idpos = pos;

+  const long long id = ReadID(m_pReader, idpos, len);

+  if (id != libwebm::kMkvCues)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume ID

+  assert((segment_stop < 0) || (pos <= segment_stop));

+  // Read Size

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  result = GetUIntLength(m_pReader, pos, len);

+  if (result < 0)  // error

+    return static_cast<long>(result);

+  if (result > 0)  // underflow (weird)

+  {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + len) > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long size = ReadUInt(m_pReader, pos, len);

+  if (size < 0)  // error

+    return static_cast<long>(size);

+  if (size == 0)  // weird, although technically not illegal

+    return 1;  // done

+  pos += len;  // consume length of size of element

+  assert((segment_stop < 0) || (pos <= segment_stop));

+  // Pos now points to start of payload

+  const long long element_stop = pos + size;

+  if ((segment_stop >= 0) && (element_stop > segment_stop))

+    return E_FILE_FORMAT_INVALID;

+  if ((total >= 0) && (element_stop > total))

+    return 1;  // don't bother parsing anymore

+  len = static_cast<long>(size);

+  if (element_stop > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long element_size = element_stop - element_start;

+  m_pCues =

+      new (std::nothrow) Cues(this, pos, size, element_start, element_size);

+  if (m_pCues == NULL)

+    return -1;

+  return 0;  // success

+}

+bool SeekHead::ParseEntry(IMkvReader* pReader, long long start, long long size_,

+                          Entry* pEntry) {

+  if (size_ <= 0)

+    return false;

+  long long pos = start;

+  const long long stop = start + size_;

+  long len;

+  // parse the container for the level-1 element ID

+  const long long seekIdId = ReadID(pReader, pos, len);

+  if (seekIdId < 0)

+    return false;

+  if (seekIdId != libwebm::kMkvSeekID)

+    return false;

+  if ((pos + len) > stop)

+    return false;

+  pos += len;  // consume SeekID id

+  const long long seekIdSize = ReadUInt(pReader, pos, len);

+  if (seekIdSize <= 0)

+    return false;

+  if ((pos + len) > stop)

+    return false;

+  pos += len;  // consume size of field

+  if ((pos + seekIdSize) > stop)

+    return false;

+  // Note that the SeekId payload really is serialized

+  // as a "Matroska integer", not as a plain binary value.

+  // In fact, Matroska requires that ID values in the

+  // stream exactly match the binary representation as listed

+  // in the Matroska specification.

+  //

+  // This parser is more liberal, and permits IDs to have

+  // any width.  (This could make the representation in the stream

+  // different from what's in the spec, but it doesn't matter here,

+  // since we always normalize "Matroska integer" values.)

+  pEntry->id = ReadUInt(pReader, pos, len);  // payload

+  if (pEntry->id <= 0)

+    return false;

+  if (len != seekIdSize)

+    return false;

+  pos += seekIdSize;  // consume SeekID payload

+  const long long seekPosId = ReadID(pReader, pos, len);

+  if (seekPosId != libwebm::kMkvSeekPosition)

+    return false;

+  if ((pos + len) > stop)

+    return false;

+  pos += len;  // consume id

+  const long long seekPosSize = ReadUInt(pReader, pos, len);

+  if (seekPosSize <= 0)

+    return false;

+  if ((pos + len) > stop)

+    return false;

+  pos += len;  // consume size

+  if ((pos + seekPosSize) > stop)

+    return false;

+  pEntry->pos = UnserializeUInt(pReader, pos, seekPosSize);

+  if (pEntry->pos < 0)

+    return false;

+  pos += seekPosSize;  // consume payload

+  if (pos != stop)

+    return false;

+  return true;

+}

+Cues::Cues(Segment* pSegment, long long start_, long long size_,

+           long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_start(start_),

+      m_size(size_),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_cue_points(NULL),

+      m_count(0),

+      m_preload_count(0),

+      m_pos(start_) {}

+Cues::~Cues() {

+  const long n = m_count + m_preload_count;

+  CuePoint** p = m_cue_points;

+  CuePoint** const q = p + n;

+  while (p != q) {

+    CuePoint* const pCP = *p++;

+    assert(pCP);

+    delete pCP;

+  }

+  delete[] m_cue_points;

+}

+long Cues::GetCount() const {

+  if (m_cue_points == NULL)

+    return -1;

+  return m_count;  // TODO: really ignore preload count?

+}

+bool Cues::DoneParsing() const {

+  const long long stop = m_start + m_size;

+  return (m_pos >= stop);

+}

+bool Cues::Init() const {

+  if (m_cue_points)

+    return true;

+  if (m_count != 0 || m_preload_count != 0)

+    return false;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  const long long stop = m_start + m_size;

+  long long pos = m_start;

+  long cue_points_size = 0;

+  while (pos < stop) {

+    const long long idpos = pos;

+    long len;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0 || (pos + len) > stop) {

+      return false;

+    }

+    pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0 || (pos + len > stop)) {

+      return false;

+    }

+    pos += len;  // consume Size field

+    if (pos + size > stop) {

+      return false;

+    }

+    if (id == libwebm::kMkvCuePoint) {

+      if (!PreloadCuePoint(cue_points_size, idpos))

+        return false;

+    }

+    pos += size;  // skip payload

+  }

+  return true;

+}

+bool Cues::PreloadCuePoint(long& cue_points_size, long long pos) const {

+  if (m_count != 0)

+    return false;

+  if (m_preload_count >= cue_points_size) {

+    const long n = (cue_points_size <= 0) ? 2048 : 2 * cue_points_size;

+    CuePoint** const qq = new (std::nothrow) CuePoint*[n];

+    if (qq == NULL)

+      return false;

+    CuePoint** q = qq;  // beginning of target

+    CuePoint** p = m_cue_points;  // beginning of source

+    CuePoint** const pp = p + m_preload_count;  // end of source

+    while (p != pp)

+      *q++ = *p++;

+    delete[] m_cue_points;

+    m_cue_points = qq;

+    cue_points_size = n;

+  }

+  CuePoint* const pCP = new (std::nothrow) CuePoint(m_preload_count, pos);

+  if (pCP == NULL)

+    return false;

+  m_cue_points[m_preload_count++] = pCP;

+  return true;

+}

+bool Cues::LoadCuePoint() const {

+  const long long stop = m_start + m_size;

+  if (m_pos >= stop)

+    return false;  // nothing else to do

+  if (!Init()) {

+    m_pos = stop;

+    return false;

+  }

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  while (m_pos < stop) {

+    const long long idpos = m_pos;

+    long len;

+    const long long id = ReadID(pReader, m_pos, len);

+    if (id < 0 || (m_pos + len) > stop)

+      return false;

+    m_pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, m_pos, len);

+    if (size < 0 || (m_pos + len) > stop)

+      return false;

+    m_pos += len;  // consume Size field

+    if ((m_pos + size) > stop)

+      return false;

+    if (id != libwebm::kMkvCuePoint) {

+      m_pos += size;  // consume payload

+      if (m_pos > stop)

+        return false;

+      continue;

+    }

+    if (m_preload_count < 1)

+      return false;

+    CuePoint* const pCP = m_cue_points[m_count];

+    if (!pCP || (pCP->GetTimeCode() < 0 && (-pCP->GetTimeCode() != idpos)))

+      return false;

+    if (!pCP->Load(pReader)) {

+      m_pos = stop;

+      return false;

+    }

+    ++m_count;

+    --m_preload_count;

+    m_pos += size;  // consume payload

+    if (m_pos > stop)

+      return false;

+    return true;  // yes, we loaded a cue point

+  }

+  return false;  // no, we did not load a cue point

+}

+bool Cues::Find(long long time_ns, const Track* pTrack, const CuePoint*& pCP,

+                const CuePoint::TrackPosition*& pTP) const {

+  if (time_ns < 0 || pTrack == NULL || m_cue_points == NULL || m_count == 0)

+    return false;

+  CuePoint** const ii = m_cue_points;

+  CuePoint** i = ii;

+  CuePoint** const jj = ii + m_count;

+  CuePoint** j = jj;

+  pCP = *i;

+  if (pCP == NULL)

+    return false;

+  if (time_ns <= pCP->GetTime(m_pSegment)) {

+    pTP = pCP->Find(pTrack);

+    return (pTP != NULL);

+  }

+  while (i < j) {

+    // INVARIANT:

+    //[ii, i) <= time_ns

+    //[i, j)  ?

+    //[j, jj) > time_ns

+    CuePoint** const k = i + (j - i) / 2;

+    if (k >= jj)

+      return false;

+    CuePoint* const pCP = *k;

+    if (pCP == NULL)

+      return false;

+    const long long t = pCP->GetTime(m_pSegment);

+    if (t <= time_ns)

+      i = k + 1;

+    else

+      j = k;

+    if (i > j)

+      return false;

+  }

+  if (i != j || i > jj || i <= ii)

+    return false;

+  pCP = *--i;

+  if (pCP == NULL || pCP->GetTime(m_pSegment) > time_ns)

+    return false;

+  // TODO: here and elsewhere, it's probably not correct to search

+  // for the cue point with this time, and then search for a matching

+  // track.  In principle, the matching track could be on some earlier

+  // cue point, and with our current algorithm, we'd miss it.  To make

+  // this bullet-proof, we'd need to create a secondary structure,

+  // with a list of cue points that apply to a track, and then search

+  // that track-based structure for a matching cue point.

+  pTP = pCP->Find(pTrack);

+  return (pTP != NULL);

+}

+const CuePoint* Cues::GetFirst() const {

+  if (m_cue_points == NULL || m_count == 0)

+    return NULL;

+  CuePoint* const* const pp = m_cue_points;

+  if (pp == NULL)

+    return NULL;

+  CuePoint* const pCP = pp[0];

+  if (pCP == NULL || pCP->GetTimeCode() < 0)

+    return NULL;

+  return pCP;

+}

+const CuePoint* Cues::GetLast() const {

+  if (m_cue_points == NULL || m_count <= 0)

+    return NULL;

+  const long index = m_count - 1;

+  CuePoint* const* const pp = m_cue_points;

+  if (pp == NULL)

+    return NULL;

+  CuePoint* const pCP = pp[index];

+  if (pCP == NULL || pCP->GetTimeCode() < 0)

+    return NULL;

+  return pCP;

+}

+const CuePoint* Cues::GetNext(const CuePoint* pCurr) const {

+  if (pCurr == NULL || pCurr->GetTimeCode() < 0 || m_cue_points == NULL ||

+      m_count < 1) {

+    return NULL;

+  }

+  long index = pCurr->m_index;

+  if (index >= m_count)

+    return NULL;

+  CuePoint* const* const pp = m_cue_points;

+  if (pp == NULL || pp[index] != pCurr)

+    return NULL;

+  ++index;

+  if (index >= m_count)

+    return NULL;

+  CuePoint* const pNext = pp[index];

+  if (pNext == NULL || pNext->GetTimeCode() < 0)

+    return NULL;

+  return pNext;

+}

+const BlockEntry* Cues::GetBlock(const CuePoint* pCP,

+                                 const CuePoint::TrackPosition* pTP) const {

+  if (pCP == NULL || pTP == NULL)

+    return NULL;

+  return m_pSegment->GetBlock(*pCP, *pTP);

+}

+const BlockEntry* Segment::GetBlock(const CuePoint& cp,

+                                    const CuePoint::TrackPosition& tp) {

+  Cluster** const ii = m_clusters;

+  Cluster** i = ii;

+  const long count = m_clusterCount + m_clusterPreloadCount;

+  Cluster** const jj = ii + count;

+  Cluster** j = jj;

+  while (i < j) {

+    // INVARIANT:

+    //[ii, i) < pTP->m_pos

+    //[i, j) ?

+    //[j, jj)  > pTP->m_pos

+    Cluster** const k = i + (j - i) / 2;

+    assert(k < jj);

+    Cluster* const pCluster = *k;

+    assert(pCluster);

+    // const long long pos_ = pCluster->m_pos;

+    // assert(pos_);

+    // const long long pos = pos_ * ((pos_ < 0) ? -1 : 1);

+    const long long pos = pCluster->GetPosition();

+    assert(pos >= 0);

+    if (pos < tp.m_pos)

+      i = k + 1;

+    else if (pos > tp.m_pos)

+      j = k;

+    else

+      return pCluster->GetEntry(cp, tp);

+  }

+  assert(i == j);

+  // assert(Cluster::HasBlockEntries(this, tp.m_pos));

+  Cluster* const pCluster = Cluster::Create(this, -1, tp.m_pos);  //, -1);

+  if (pCluster == NULL)

+    return NULL;

+  const ptrdiff_t idx = i - m_clusters;

+  if (!PreloadCluster(pCluster, idx)) {

+    delete pCluster;

+    return NULL;

+  }

+  assert(m_clusters);

+  assert(m_clusterPreloadCount > 0);

+  assert(m_clusters[idx] == pCluster);

+  return pCluster->GetEntry(cp, tp);

+}

+const Cluster* Segment::FindOrPreloadCluster(long long requested_pos) {

+  if (requested_pos < 0)

+    return 0;

+  Cluster** const ii = m_clusters;

+  Cluster** i = ii;

+  const long count = m_clusterCount + m_clusterPreloadCount;

+  Cluster** const jj = ii + count;

+  Cluster** j = jj;

+  while (i < j) {

+    // INVARIANT:

+    //[ii, i) < pTP->m_pos

+    //[i, j) ?

+    //[j, jj)  > pTP->m_pos

+    Cluster** const k = i + (j - i) / 2;

+    assert(k < jj);

+    Cluster* const pCluster = *k;

+    assert(pCluster);

+    // const long long pos_ = pCluster->m_pos;

+    // assert(pos_);

+    // const long long pos = pos_ * ((pos_ < 0) ? -1 : 1);

+    const long long pos = pCluster->GetPosition();

+    assert(pos >= 0);

+    if (pos < requested_pos)

+      i = k + 1;

+    else if (pos > requested_pos)

+      j = k;

+    else

+      return pCluster;

+  }

+  assert(i == j);

+  // assert(Cluster::HasBlockEntries(this, tp.m_pos));

+  Cluster* const pCluster = Cluster::Create(this, -1, requested_pos);

+  if (pCluster == NULL)

+    return NULL;

+  const ptrdiff_t idx = i - m_clusters;

+  if (!PreloadCluster(pCluster, idx)) {

+    delete pCluster;

+    return NULL;

+  }

+  assert(m_clusters);

+  assert(m_clusterPreloadCount > 0);

+  assert(m_clusters[idx] == pCluster);

+  return pCluster;

+}

+CuePoint::CuePoint(long idx, long long pos)

+    : m_element_start(0),

+      m_element_size(0),

+      m_index(idx),

+      m_timecode(-1 * pos),

+      m_track_positions(NULL),

+      m_track_positions_count(0) {

+  assert(pos > 0);

+}

+CuePoint::~CuePoint() { delete[] m_track_positions; }

+bool CuePoint::Load(IMkvReader* pReader) {

+  // odbgstream os;

+  // os << "CuePoint::Load(begin): timecode=" << m_timecode << endl;

+  if (m_timecode >= 0)  // already loaded

+    return true;

+  assert(m_track_positions == NULL);

+  assert(m_track_positions_count == 0);

+  long long pos_ = -m_timecode;

+  const long long element_start = pos_;

+  long long stop;

+  {

+    long len;

+    const long long id = ReadID(pReader, pos_, len);

+    if (id != libwebm::kMkvCuePoint)

+      return false;

+    pos_ += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos_, len);

+    assert(size >= 0);

+    pos_ += len;  // consume Size field

+    // pos_ now points to start of payload

+    stop = pos_ + size;

+  }

+  const long long element_size = stop - element_start;

+  long long pos = pos_;

+  // First count number of track positions

+  while (pos < stop) {

+    long len;

+    const long long id = ReadID(pReader, pos, len);

+    if ((id < 0) || (pos + len > stop)) {

+      return false;

+    }

+    pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos, len);

+    if ((size < 0) || (pos + len > stop)) {

+      return false;

+    }

+    pos += len;  // consume Size field

+    if ((pos + size) > stop) {

+      return false;

+    }

+    if (id == libwebm::kMkvCueTime)

+      m_timecode = UnserializeUInt(pReader, pos, size);

+    else if (id == libwebm::kMkvCueTrackPositions)

+      ++m_track_positions_count;

+    pos += size;  // consume payload

+  }

+  if (m_timecode < 0 || m_track_positions_count <= 0) {

+    return false;

+  }

+  // os << "CuePoint::Load(cont'd): idpos=" << idpos

+  //   << " timecode=" << m_timecode

+  //   << endl;

+  m_track_positions = new (std::nothrow) TrackPosition[m_track_positions_count];

+  if (m_track_positions == NULL)

+    return false;

+  // Now parse track positions

+  TrackPosition* p = m_track_positions;

+  pos = pos_;

+  while (pos < stop) {

+    long len;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0 || (pos + len) > stop)

+      return false;

+    pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos, len);

+    assert(size >= 0);

+    assert((pos + len) <= stop);

+    pos += len;  // consume Size field

+    assert((pos + size) <= stop);

+    if (id == libwebm::kMkvCueTrackPositions) {

+      TrackPosition& tp = *p++;

+      if (!tp.Parse(pReader, pos, size)) {

+        return false;

+      }

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return false;

+  }

+  assert(size_t(p - m_track_positions) == m_track_positions_count);

+  m_element_start = element_start;

+  m_element_size = element_size;

+  return true;

+}

+bool CuePoint::TrackPosition::Parse(IMkvReader* pReader, long long start_,

+                                    long long size_) {

+  const long long stop = start_ + size_;

+  long long pos = start_;

+  m_track = -1;

+  m_pos = -1;

+  m_block = 1;  // default

+  while (pos < stop) {

+    long len;

+    const long long id = ReadID(pReader, pos, len);

+    if ((id < 0) || ((pos + len) > stop)) {

+      return false;

+    }

+    pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos, len);

+    if ((size < 0) || ((pos + len) > stop)) {

+      return false;

+    }

+    pos += len;  // consume Size field

+    if ((pos + size) > stop) {

+      return false;

+    }

+    if (id == libwebm::kMkvCueTrack)

+      m_track = UnserializeUInt(pReader, pos, size);

+    else if (id == libwebm::kMkvCueClusterPosition)

+      m_pos = UnserializeUInt(pReader, pos, size);

+    else if (id == libwebm::kMkvCueBlockNumber)

+      m_block = UnserializeUInt(pReader, pos, size);

+    pos += size;  // consume payload

+  }

+  if ((m_pos < 0) || (m_track <= 0)) {

+    return false;

+  }

+  return true;

+}

+const CuePoint::TrackPosition* CuePoint::Find(const Track* pTrack) const {

+  assert(pTrack);

+  const long long n = pTrack->GetNumber();

+  const TrackPosition* i = m_track_positions;

+  const TrackPosition* const j = i + m_track_positions_count;

+  while (i != j) {

+    const TrackPosition& p = *i++;

+    if (p.m_track == n)

+      return &p;

+  }

+  return NULL;  // no matching track number found

+}

+long long CuePoint::GetTimeCode() const { return m_timecode; }

+long long CuePoint::GetTime(const Segment* pSegment) const {

+  assert(pSegment);

+  assert(m_timecode >= 0);

+  const SegmentInfo* const pInfo = pSegment->GetInfo();

+  assert(pInfo);

+  const long long scale = pInfo->GetTimeCodeScale();

+  assert(scale >= 1);

+  const long long time = scale * m_timecode;

+  return time;

+}

+bool Segment::DoneParsing() const {

+  if (m_size < 0) {

+    long long total, avail;

+    const int status = m_pReader->Length(&total, &avail);

+    if (status < 0)  // error

+      return true;  // must assume done

+    if (total < 0)

+      return false;  // assume live stream

+    return (m_pos >= total);

+  }

+  const long long stop = m_start + m_size;

+  return (m_pos >= stop);

+}

+const Cluster* Segment::GetFirst() const {

+  if ((m_clusters == NULL) || (m_clusterCount <= 0))

+    return &m_eos;

+  Cluster* const pCluster = m_clusters[0];

+  assert(pCluster);

+  return pCluster;

+}

+const Cluster* Segment::GetLast() const {

+  if ((m_clusters == NULL) || (m_clusterCount <= 0))

+    return &m_eos;

+  const long idx = m_clusterCount - 1;

+  Cluster* const pCluster = m_clusters[idx];

+  assert(pCluster);

+  return pCluster;

+}

+unsigned long Segment::GetCount() const { return m_clusterCount; }

+const Cluster* Segment::GetNext(const Cluster* pCurr) {

+  assert(pCurr);

+  assert(pCurr != &m_eos);

+  assert(m_clusters);

+  long idx = pCurr->m_index;

+  if (idx >= 0) {

+    assert(m_clusterCount > 0);

+    assert(idx < m_clusterCount);

+    assert(pCurr == m_clusters[idx]);

+    ++idx;

+    if (idx >= m_clusterCount)

+      return &m_eos;  // caller will LoadCluster as desired

+    Cluster* const pNext = m_clusters[idx];

+    assert(pNext);

+    assert(pNext->m_index >= 0);

+    assert(pNext->m_index == idx);

+    return pNext;

+  }

+  assert(m_clusterPreloadCount > 0);

+  long long pos = pCurr->m_element_start;

+  assert(m_size >= 0);  // TODO

+  const long long stop = m_start + m_size;  // end of segment

+  {

+    long len;

+    long long result = GetUIntLength(m_pReader, pos, len);

+    assert(result == 0);

+    assert((pos + len) <= stop);  // TODO

+    if (result != 0)

+      return NULL;

+    const long long id = ReadID(m_pReader, pos, len);

+    if (id != libwebm::kMkvCluster)

+      return NULL;

+    pos += len;  // consume ID

+    // Read Size

+    result = GetUIntLength(m_pReader, pos, len);

+    assert(result == 0);  // TODO

+    assert((pos + len) <= stop);  // TODO

+    const long long size = ReadUInt(m_pReader, pos, len);

+    assert(size > 0);  // TODO

+    // assert((pCurr->m_size <= 0) || (pCurr->m_size == size));

+    pos += len;  // consume length of size of element

+    assert((pos + size) <= stop);  // TODO

+    // Pos now points to start of payload

+    pos += size;  // consume payload

+  }

+  long long off_next = 0;

+  while (pos < stop) {

+    long len;

+    long long result = GetUIntLength(m_pReader, pos, len);

+    assert(result == 0);

+    assert((pos + len) <= stop);  // TODO

+    if (result != 0)

+      return NULL;

+    const long long idpos = pos;  // pos of next (potential) cluster

+    const long long id = ReadID(m_pReader, idpos, len);

+    if (id < 0)

+      return NULL;

+    pos += len;  // consume ID

+    // Read Size

+    result = GetUIntLength(m_pReader, pos, len);

+    assert(result == 0);  // TODO

+    assert((pos + len) <= stop);  // TODO

+    const long long size = ReadUInt(m_pReader, pos, len);

+    assert(size >= 0);  // TODO

+    pos += len;  // consume length of size of element

+    assert((pos + size) <= stop);  // TODO

+    // Pos now points to start of payload

+    if (size == 0)  // weird

+      continue;

+    if (id == libwebm::kMkvCluster) {

+      const long long off_next_ = idpos - m_start;

+      long long pos_;

+      long len_;

+      const long status = Cluster::HasBlockEntries(this, off_next_, pos_, len_);

+      assert(status >= 0);

+      if (status > 0) {

+        off_next = off_next_;

+        break;

+      }

+    }

+    pos += size;  // consume payload

+  }

+  if (off_next <= 0)

+    return 0;

+  Cluster** const ii = m_clusters + m_clusterCount;

+  Cluster** i = ii;

+  Cluster** const jj = ii + m_clusterPreloadCount;

+  Cluster** j = jj;

+  while (i < j) {

+    // INVARIANT:

+    //[0, i) < pos_next

+    //[i, j) ?

+    //[j, jj)  > pos_next

+    Cluster** const k = i + (j - i) / 2;

+    assert(k < jj);

+    Cluster* const pNext = *k;

+    assert(pNext);

+    assert(pNext->m_index < 0);

+    // const long long pos_ = pNext->m_pos;

+    // assert(pos_);

+    // pos = pos_ * ((pos_ < 0) ? -1 : 1);

+    pos = pNext->GetPosition();

+    if (pos < off_next)

+      i = k + 1;

+    else if (pos > off_next)

+      j = k;

+    else

+      return pNext;

+  }

+  assert(i == j);

+  Cluster* const pNext = Cluster::Create(this, -1, off_next);

+  if (pNext == NULL)

+    return NULL;

+  const ptrdiff_t idx_next = i - m_clusters;  // insertion position

+  if (!PreloadCluster(pNext, idx_next)) {

+    delete pNext;

+    return NULL;

+  }

+  assert(m_clusters);

+  assert(idx_next < m_clusterSize);

+  assert(m_clusters[idx_next] == pNext);

+  return pNext;

+}

+long Segment::ParseNext(const Cluster* pCurr, const Cluster*& pResult,

+                        long long& pos, long& len) {

+  assert(pCurr);

+  assert(!pCurr->EOS());

+  assert(m_clusters);

+  pResult = 0;

+  if (pCurr->m_index >= 0) {  // loaded (not merely preloaded)

+    assert(m_clusters[pCurr->m_index] == pCurr);

+    const long next_idx = pCurr->m_index + 1;

+    if (next_idx < m_clusterCount) {

+      pResult = m_clusters[next_idx];

+      return 0;  // success

+    }

+    // curr cluster is last among loaded

+    const long result = LoadCluster(pos, len);

+    if (result < 0)  // error or underflow

+      return result;

+    if (result > 0)  // no more clusters

+    {

+      // pResult = &m_eos;

+      return 1;

+    }

+    pResult = GetLast();

+    return 0;  // success

+  }

+  assert(m_pos > 0);

+  long long total, avail;

+  long status = m_pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

+  // interrogate curr cluster

+  pos = pCurr->m_element_start;

+  if (pCurr->m_element_size >= 0)

+    pos += pCurr->m_element_size;

+  else {

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadUInt(m_pReader, pos, len);

+    if (id != libwebm::kMkvCluster)

+      return -1;

+    pos += len;  // consume ID

+    // Read Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(m_pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    pos += len;  // consume size field

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size == unknown_size)  // TODO: should never happen

+      return E_FILE_FORMAT_INVALID;  // TODO: resolve this

+    // assert((pCurr->m_size <= 0) || (pCurr->m_size == size));

+    if ((segment_stop >= 0) && ((pos + size) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    // Pos now points to start of payload

+    pos += size;  // consume payload (that is, the current cluster)

+    if (segment_stop >= 0 && pos > segment_stop)

+      return E_FILE_FORMAT_INVALID;

+    // By consuming the payload, we are assuming that the curr

+    // cluster isn't interesting.  That is, we don't bother checking

+    // whether the payload of the curr cluster is less than what

+    // happens to be available (obtained via IMkvReader::Length).

+    // Presumably the caller has already dispensed with the current

+    // cluster, and really does want the next cluster.

+  }

+  // pos now points to just beyond the last fully-loaded cluster

+  for (;;) {

+    const long status = DoParseNext(pResult, pos, len);

+    if (status <= 1)

+      return status;

+  }

+}

+long Segment::DoParseNext(const Cluster*& pResult, long long& pos, long& len) {

+  long long total, avail;

+  long status = m_pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  const long long segment_stop = (m_size < 0) ? -1 : m_start + m_size;

+  // Parse next cluster.  This is strictly a parsing activity.

+  // Creation of a new cluster object happens later, after the

+  // parsing is done.

+  long long off_next = 0;

+  long long cluster_size = -1;

+  for (;;) {

+    if ((total >= 0) && (pos >= total))

+      return 1;  // EOF

+    if ((segment_stop >= 0) && (pos >= segment_stop))

+      return 1;  // EOF

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long idpos = pos;  // absolute

+    const long long idoff = pos - m_start;  // relative

+    const long long id = ReadID(m_pReader, idpos, len);  // absolute

+    if (id < 0)  // error

+      return static_cast<long>(id);

+    if (id == 0)  // weird

+      return -1;  // generic error

+    pos += len;  // consume ID

+    // Read Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(m_pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(m_pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    pos += len;  // consume length of size of element

+    // Pos now points to start of payload

+    if (size == 0)  // weird

+      continue;

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if ((segment_stop >= 0) && (size != unknown_size) &&

+        ((pos + size) > segment_stop)) {

+      return E_FILE_FORMAT_INVALID;

+    }

+    if (id == libwebm::kMkvCues) {

+      if (size == unknown_size)

+        return E_FILE_FORMAT_INVALID;

+      const long long element_stop = pos + size;

+      if ((segment_stop >= 0) && (element_stop > segment_stop))

+        return E_FILE_FORMAT_INVALID;

+      const long long element_start = idpos;

+      const long long element_size = element_stop - element_start;

+      if (m_pCues == NULL) {

+        m_pCues = new (std::nothrow)

+            Cues(this, pos, size, element_start, element_size);

+        if (m_pCues == NULL)

+          return false;

+      }

+      pos += size;  // consume payload

+      if (segment_stop >= 0 && pos > segment_stop)

+        return E_FILE_FORMAT_INVALID;

+      continue;

+    }

+    if (id != libwebm::kMkvCluster) {  // not a Cluster ID

+      if (size == unknown_size)

+        return E_FILE_FORMAT_INVALID;

+      pos += size;  // consume payload

+      if (segment_stop >= 0 && pos > segment_stop)

+        return E_FILE_FORMAT_INVALID;

+      continue;

+    }

+    // We have a cluster.

+    off_next = idoff;

+    if (size != unknown_size)

+      cluster_size = size;

+    break;

+  }

+  assert(off_next > 0);  // have cluster

+  // We have parsed the next cluster.

+  // We have not created a cluster object yet.  What we need

+  // to do now is determine whether it has already be preloaded

+  //(in which case, an object for this cluster has already been

+  // created), and if not, create a new cluster object.

+  Cluster** const ii = m_clusters + m_clusterCount;

+  Cluster** i = ii;

+  Cluster** const jj = ii + m_clusterPreloadCount;

+  Cluster** j = jj;

+  while (i < j) {

+    // INVARIANT:

+    //[0, i) < pos_next

+    //[i, j) ?

+    //[j, jj)  > pos_next

+    Cluster** const k = i + (j - i) / 2;

+    assert(k < jj);

+    const Cluster* const pNext = *k;

+    assert(pNext);

+    assert(pNext->m_index < 0);

+    pos = pNext->GetPosition();

+    assert(pos >= 0);

+    if (pos < off_next)

+      i = k + 1;

+    else if (pos > off_next)

+      j = k;

+    else {

+      pResult = pNext;

+      return 0;  // success

+    }

+  }

+  assert(i == j);

+  long long pos_;

+  long len_;

+  status = Cluster::HasBlockEntries(this, off_next, pos_, len_);

+  if (status < 0) {  // error or underflow

+    pos = pos_;

+    len = len_;

+    return status;

+  }

+  if (status > 0) {  // means "found at least one block entry"

+    Cluster* const pNext = Cluster::Create(this,

+                                           -1,  // preloaded

+                                           off_next);

+    if (pNext == NULL)

+      return -1;

+    const ptrdiff_t idx_next = i - m_clusters;  // insertion position

+    if (!PreloadCluster(pNext, idx_next)) {

+      delete pNext;

+      return -1;

+    }

+    assert(m_clusters);

+    assert(idx_next < m_clusterSize);

+    assert(m_clusters[idx_next] == pNext);

+    pResult = pNext;

+    return 0;  // success

+  }

+  // status == 0 means "no block entries found"

+  if (cluster_size < 0) {  // unknown size

+    const long long payload_pos = pos;  // absolute pos of cluster payload

+    for (;;) {  // determine cluster size

+      if ((total >= 0) && (pos >= total))

+        break;

+      if ((segment_stop >= 0) && (pos >= segment_stop))

+        break;  // no more clusters

+      // Read ID

+      if ((pos + 1) > avail) {

+        len = 1;

+        return E_BUFFER_NOT_FULL;

+      }

+      long long result = GetUIntLength(m_pReader, pos, len);

+      if (result < 0)  // error

+        return static_cast<long>(result);

+      if (result > 0)  // weird

+        return E_BUFFER_NOT_FULL;

+      if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+        return E_FILE_FORMAT_INVALID;

+      if ((pos + len) > avail)

+        return E_BUFFER_NOT_FULL;

+      const long long idpos = pos;

+      const long long id = ReadID(m_pReader, idpos, len);

+      if (id < 0)  // error (or underflow)

+        return static_cast<long>(id);

+      // This is the distinguished set of ID's we use to determine

+      // that we have exhausted the sub-element's inside the cluster

+      // whose ID we parsed earlier.

+      if (id == libwebm::kMkvCluster || id == libwebm::kMkvCues)

+        break;

+      pos += len;  // consume ID (of sub-element)

+      // Read Size

+      if ((pos + 1) > avail) {

+        len = 1;

+        return E_BUFFER_NOT_FULL;

+      }

+      result = GetUIntLength(m_pReader, pos, len);

+      if (result < 0)  // error

+        return static_cast<long>(result);

+      if (result > 0)  // weird

+        return E_BUFFER_NOT_FULL;

+      if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+        return E_FILE_FORMAT_INVALID;

+      if ((pos + len) > avail)

+        return E_BUFFER_NOT_FULL;

+      const long long size = ReadUInt(m_pReader, pos, len);

+      if (size < 0)  // error

+        return static_cast<long>(size);

+      pos += len;  // consume size field of element

+      // pos now points to start of sub-element's payload

+      if (size == 0)  // weird

+        continue;

+      const long long unknown_size = (1LL << (7 * len)) - 1;

+      if (size == unknown_size)

+        return E_FILE_FORMAT_INVALID;  // not allowed for sub-elements

+      if ((segment_stop >= 0) && ((pos + size) > segment_stop))  // weird

+        return E_FILE_FORMAT_INVALID;

+      pos += size;  // consume payload of sub-element

+      if (segment_stop >= 0 && pos > segment_stop)

+        return E_FILE_FORMAT_INVALID;

+    }  // determine cluster size

+    cluster_size = pos - payload_pos;

+    assert(cluster_size >= 0);  // TODO: handle cluster_size = 0

+    pos = payload_pos;  // reset and re-parse original cluster

+  }

+  pos += cluster_size;  // consume payload

+  if (segment_stop >= 0 && pos > segment_stop)

+    return E_FILE_FORMAT_INVALID;

+  return 2;  // try to find a cluster that follows next

+}

+const Cluster* Segment::FindCluster(long long time_ns) const {

+  if ((m_clusters == NULL) || (m_clusterCount <= 0))

+    return &m_eos;

+  {

+    Cluster* const pCluster = m_clusters[0];

+    assert(pCluster);

+    assert(pCluster->m_index == 0);

+    if (time_ns <= pCluster->GetTime())

+      return pCluster;

+  }

+  // Binary search of cluster array

+  long i = 0;

+  long j = m_clusterCount;

+  while (i < j) {

+    // INVARIANT:

+    //[0, i) <= time_ns

+    //[i, j) ?

+    //[j, m_clusterCount)  > time_ns

+    const long k = i + (j - i) / 2;

+    assert(k < m_clusterCount);

+    Cluster* const pCluster = m_clusters[k];

+    assert(pCluster);

+    assert(pCluster->m_index == k);

+    const long long t = pCluster->GetTime();

+    if (t <= time_ns)

+      i = k + 1;

+    else

+      j = k;

+    assert(i <= j);

+  }

+  assert(i == j);

+  assert(i > 0);

+  assert(i <= m_clusterCount);

+  const long k = i - 1;

+  Cluster* const pCluster = m_clusters[k];

+  assert(pCluster);

+  assert(pCluster->m_index == k);

+  assert(pCluster->GetTime() <= time_ns);

+  return pCluster;

+}

+const Tracks* Segment::GetTracks() const { return m_pTracks; }

+const SegmentInfo* Segment::GetInfo() const { return m_pInfo; }

+const Cues* Segment::GetCues() const { return m_pCues; }

+const Chapters* Segment::GetChapters() const { return m_pChapters; }

+const Tags* Segment::GetTags() const { return m_pTags; }

+const SeekHead* Segment::GetSeekHead() const { return m_pSeekHead; }

+long long Segment::GetDuration() const {

+  assert(m_pInfo);

+  return m_pInfo->GetDuration();

+}

+Chapters::Chapters(Segment* pSegment, long long payload_start,

+                   long long payload_size, long long element_start,

+                   long long element_size)

+    : m_pSegment(pSegment),

+      m_start(payload_start),

+      m_size(payload_size),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_editions(NULL),

+      m_editions_size(0),

+      m_editions_count(0) {}

+Chapters::~Chapters() {

+  while (m_editions_count > 0) {

+    Edition& e = m_editions[--m_editions_count];

+    e.Clear();

+  }

+  delete[] m_editions;

+}

+long Chapters::Parse() {

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = m_start;  // payload start

+  const long long stop = pos + m_size;  // payload stop

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)  // weird

+      continue;

+    if (id == libwebm::kMkvEditionEntry) {

+      status = ParseEdition(pos, size);

+      if (status < 0)  // error

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+int Chapters::GetEditionCount() const { return m_editions_count; }

+const Chapters::Edition* Chapters::GetEdition(int idx) const {

+  if (idx < 0)

+    return NULL;

+  if (idx >= m_editions_count)

+    return NULL;

+  return m_editions + idx;

+}

+bool Chapters::ExpandEditionsArray() {

+  if (m_editions_size > m_editions_count)

+    return true;  // nothing else to do

+  const int size = (m_editions_size == 0) ? 1 : 2 * m_editions_size;

+  Edition* const editions = new (std::nothrow) Edition[size];

+  if (editions == NULL)

+    return false;

+  for (int idx = 0; idx < m_editions_count; ++idx) {

+    m_editions[idx].ShallowCopy(editions[idx]);

+  }

+  delete[] m_editions;

+  m_editions = editions;

+  m_editions_size = size;

+  return true;

+}

+long Chapters::ParseEdition(long long pos, long long size) {

+  if (!ExpandEditionsArray())

+    return -1;

+  Edition& e = m_editions[m_editions_count++];

+  e.Init();

+  return e.Parse(m_pSegment->m_pReader, pos, size);

+}

+Chapters::Edition::Edition() {}

+Chapters::Edition::~Edition() {}

+int Chapters::Edition::GetAtomCount() const { return m_atoms_count; }

+const Chapters::Atom* Chapters::Edition::GetAtom(int index) const {

+  if (index < 0)

+    return NULL;

+  if (index >= m_atoms_count)

+    return NULL;

+  return m_atoms + index;

+}

+void Chapters::Edition::Init() {

+  m_atoms = NULL;

+  m_atoms_size = 0;

+  m_atoms_count = 0;

+}

+void Chapters::Edition::ShallowCopy(Edition& rhs) const {

+  rhs.m_atoms = m_atoms;

+  rhs.m_atoms_size = m_atoms_size;

+  rhs.m_atoms_count = m_atoms_count;

+}

+void Chapters::Edition::Clear() {

+  while (m_atoms_count > 0) {

+    Atom& a = m_atoms[--m_atoms_count];

+    a.Clear();

+  }

+  delete[] m_atoms;

+  m_atoms = NULL;

+  m_atoms_size = 0;

+}

+long Chapters::Edition::Parse(IMkvReader* pReader, long long pos,

+                              long long size) {

+  const long long stop = pos + size;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)

+      continue;

+    if (id == libwebm::kMkvChapterAtom) {

+      status = ParseAtom(pReader, pos, size);

+      if (status < 0)  // error

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long Chapters::Edition::ParseAtom(IMkvReader* pReader, long long pos,

+                                  long long size) {

+  if (!ExpandAtomsArray())

+    return -1;

+  Atom& a = m_atoms[m_atoms_count++];

+  a.Init();

+  return a.Parse(pReader, pos, size);

+}

+bool Chapters::Edition::ExpandAtomsArray() {

+  if (m_atoms_size > m_atoms_count)

+    return true;  // nothing else to do

+  const int size = (m_atoms_size == 0) ? 1 : 2 * m_atoms_size;

+  Atom* const atoms = new (std::nothrow) Atom[size];

+  if (atoms == NULL)

+    return false;

+  for (int idx = 0; idx < m_atoms_count; ++idx) {

+    m_atoms[idx].ShallowCopy(atoms[idx]);

+  }

+  delete[] m_atoms;

+  m_atoms = atoms;

+  m_atoms_size = size;

+  return true;

+}

+Chapters::Atom::Atom() {}

+Chapters::Atom::~Atom() {}

+unsigned long long Chapters::Atom::GetUID() const { return m_uid; }

+const char* Chapters::Atom::GetStringUID() const { return m_string_uid; }

+long long Chapters::Atom::GetStartTimecode() const { return m_start_timecode; }

+long long Chapters::Atom::GetStopTimecode() const { return m_stop_timecode; }

+long long Chapters::Atom::GetStartTime(const Chapters* pChapters) const {

+  return GetTime(pChapters, m_start_timecode);

+}

+long long Chapters::Atom::GetStopTime(const Chapters* pChapters) const {

+  return GetTime(pChapters, m_stop_timecode);

+}

+int Chapters::Atom::GetDisplayCount() const { return m_displays_count; }

+const Chapters::Display* Chapters::Atom::GetDisplay(int index) const {

+  if (index < 0)

+    return NULL;

+  if (index >= m_displays_count)

+    return NULL;

+  return m_displays + index;

+}

+void Chapters::Atom::Init() {

+  m_string_uid = NULL;

+  m_uid = 0;

+  m_start_timecode = -1;

+  m_stop_timecode = -1;

+  m_displays = NULL;

+  m_displays_size = 0;

+  m_displays_count = 0;

+}

+void Chapters::Atom::ShallowCopy(Atom& rhs) const {

+  rhs.m_string_uid = m_string_uid;

+  rhs.m_uid = m_uid;

+  rhs.m_start_timecode = m_start_timecode;

+  rhs.m_stop_timecode = m_stop_timecode;

+  rhs.m_displays = m_displays;

+  rhs.m_displays_size = m_displays_size;

+  rhs.m_displays_count = m_displays_count;

+}

+void Chapters::Atom::Clear() {

+  delete[] m_string_uid;

+  m_string_uid = NULL;

+  while (m_displays_count > 0) {

+    Display& d = m_displays[--m_displays_count];

+    d.Clear();

+  }

+  delete[] m_displays;

+  m_displays = NULL;

+  m_displays_size = 0;

+}

+long Chapters::Atom::Parse(IMkvReader* pReader, long long pos, long long size) {

+  const long long stop = pos + size;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)  // 0 length payload, skip.

+      continue;

+    if (id == libwebm::kMkvChapterDisplay) {

+      status = ParseDisplay(pReader, pos, size);

+      if (status < 0)  // error

+        return status;

+    } else if (id == libwebm::kMkvChapterStringUID) {

+      status = UnserializeString(pReader, pos, size, m_string_uid);

+      if (status < 0)  // error

+        return status;

+    } else if (id == libwebm::kMkvChapterUID) {

+      long long val;

+      status = UnserializeInt(pReader, pos, size, val);

+      if (status < 0)  // error

+        return status;

+      m_uid = static_cast<unsigned long long>(val);

+    } else if (id == libwebm::kMkvChapterTimeStart) {

+      const long long val = UnserializeUInt(pReader, pos, size);

+      if (val < 0)  // error

+        return static_cast<long>(val);

+      m_start_timecode = val;

+    } else if (id == libwebm::kMkvChapterTimeEnd) {

+      const long long val = UnserializeUInt(pReader, pos, size);

+      if (val < 0)  // error

+        return static_cast<long>(val);

+      m_stop_timecode = val;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long long Chapters::Atom::GetTime(const Chapters* pChapters,

+                                  long long timecode) {

+  if (pChapters == NULL)

+    return -1;

+  Segment* const pSegment = pChapters->m_pSegment;

+  if (pSegment == NULL)  // weird

+    return -1;

+  const SegmentInfo* const pInfo = pSegment->GetInfo();

+  if (pInfo == NULL)

+    return -1;

+  const long long timecode_scale = pInfo->GetTimeCodeScale();

+  if (timecode_scale < 1)  // weird

+    return -1;

+  if (timecode < 0)

+    return -1;

+  const long long result = timecode_scale * timecode;

+  return result;

+}

+long Chapters::Atom::ParseDisplay(IMkvReader* pReader, long long pos,

+                                  long long size) {

+  if (!ExpandDisplaysArray())

+    return -1;

+  Display& d = m_displays[m_displays_count++];

+  d.Init();

+  return d.Parse(pReader, pos, size);

+}

+bool Chapters::Atom::ExpandDisplaysArray() {

+  if (m_displays_size > m_displays_count)

+    return true;  // nothing else to do

+  const int size = (m_displays_size == 0) ? 1 : 2 * m_displays_size;

+  Display* const displays = new (std::nothrow) Display[size];

+  if (displays == NULL)

+    return false;

+  for (int idx = 0; idx < m_displays_count; ++idx) {

+    m_displays[idx].ShallowCopy(displays[idx]);

+  }

+  delete[] m_displays;

+  m_displays = displays;

+  m_displays_size = size;

+  return true;

+}

+Chapters::Display::Display() {}

+Chapters::Display::~Display() {}

+const char* Chapters::Display::GetString() const { return m_string; }

+const char* Chapters::Display::GetLanguage() const { return m_language; }

+const char* Chapters::Display::GetCountry() const { return m_country; }

+void Chapters::Display::Init() {

+  m_string = NULL;

+  m_language = NULL;

+  m_country = NULL;

+}

+void Chapters::Display::ShallowCopy(Display& rhs) const {

+  rhs.m_string = m_string;

+  rhs.m_language = m_language;

+  rhs.m_country = m_country;

+}

+void Chapters::Display::Clear() {

+  delete[] m_string;

+  m_string = NULL;

+  delete[] m_language;

+  m_language = NULL;

+  delete[] m_country;

+  m_country = NULL;

+}

+long Chapters::Display::Parse(IMkvReader* pReader, long long pos,

+                              long long size) {

+  const long long stop = pos + size;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)  // No payload.

+      continue;

+    if (id == libwebm::kMkvChapString) {

+      status = UnserializeString(pReader, pos, size, m_string);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvChapLanguage) {

+      status = UnserializeString(pReader, pos, size, m_language);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvChapCountry) {

+      status = UnserializeString(pReader, pos, size, m_country);

+      if (status)

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+Tags::Tags(Segment* pSegment, long long payload_start, long long payload_size,

+           long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_start(payload_start),

+      m_size(payload_size),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_tags(NULL),

+      m_tags_size(0),

+      m_tags_count(0) {}

+Tags::~Tags() {

+  while (m_tags_count > 0) {

+    Tag& t = m_tags[--m_tags_count];

+    t.Clear();

+  }

+  delete[] m_tags;

+}

+long Tags::Parse() {

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = m_start;  // payload start

+  const long long stop = pos + m_size;  // payload stop

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)

+      return status;

+    if (size == 0)  // 0 length tag, read another

+      continue;

+    if (id == libwebm::kMkvTag) {

+      status = ParseTag(pos, size);

+      if (status < 0)

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+int Tags::GetTagCount() const { return m_tags_count; }

+const Tags::Tag* Tags::GetTag(int idx) const {

+  if (idx < 0)

+    return NULL;

+  if (idx >= m_tags_count)

+    return NULL;

+  return m_tags + idx;

+}

+bool Tags::ExpandTagsArray() {

+  if (m_tags_size > m_tags_count)

+    return true;  // nothing else to do

+  const int size = (m_tags_size == 0) ? 1 : 2 * m_tags_size;

+  Tag* const tags = new (std::nothrow) Tag[size];

+  if (tags == NULL)

+    return false;

+  for (int idx = 0; idx < m_tags_count; ++idx) {

+    m_tags[idx].ShallowCopy(tags[idx]);

+  }

+  delete[] m_tags;

+  m_tags = tags;

+  m_tags_size = size;

+  return true;

+}

+long Tags::ParseTag(long long pos, long long size) {

+  if (!ExpandTagsArray())

+    return -1;

+  Tag& t = m_tags[m_tags_count++];

+  t.Init();

+  return t.Parse(m_pSegment->m_pReader, pos, size);

+}

+Tags::Tag::Tag() {}

+Tags::Tag::~Tag() {}

+int Tags::Tag::GetSimpleTagCount() const { return m_simple_tags_count; }

+const Tags::SimpleTag* Tags::Tag::GetSimpleTag(int index) const {

+  if (index < 0)

+    return NULL;

+  if (index >= m_simple_tags_count)

+    return NULL;

+  return m_simple_tags + index;

+}

+void Tags::Tag::Init() {

+  m_simple_tags = NULL;

+  m_simple_tags_size = 0;

+  m_simple_tags_count = 0;

+}

+void Tags::Tag::ShallowCopy(Tag& rhs) const {

+  rhs.m_simple_tags = m_simple_tags;

+  rhs.m_simple_tags_size = m_simple_tags_size;

+  rhs.m_simple_tags_count = m_simple_tags_count;

+}

+void Tags::Tag::Clear() {

+  while (m_simple_tags_count > 0) {

+    SimpleTag& d = m_simple_tags[--m_simple_tags_count];

+    d.Clear();

+  }

+  delete[] m_simple_tags;

+  m_simple_tags = NULL;

+  m_simple_tags_size = 0;

+}

+long Tags::Tag::Parse(IMkvReader* pReader, long long pos, long long size) {

+  const long long stop = pos + size;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)

+      return status;

+    if (size == 0)  // 0 length tag, read another

+      continue;

+    if (id == libwebm::kMkvSimpleTag) {

+      status = ParseSimpleTag(pReader, pos, size);

+      if (status < 0)

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long Tags::Tag::ParseSimpleTag(IMkvReader* pReader, long long pos,

+                               long long size) {

+  if (!ExpandSimpleTagsArray())

+    return -1;

+  SimpleTag& st = m_simple_tags[m_simple_tags_count++];

+  st.Init();

+  return st.Parse(pReader, pos, size);

+}

+bool Tags::Tag::ExpandSimpleTagsArray() {

+  if (m_simple_tags_size > m_simple_tags_count)

+    return true;  // nothing else to do

+  const int size = (m_simple_tags_size == 0) ? 1 : 2 * m_simple_tags_size;

+  SimpleTag* const displays = new (std::nothrow) SimpleTag[size];

+  if (displays == NULL)

+    return false;

+  for (int idx = 0; idx < m_simple_tags_count; ++idx) {

+    m_simple_tags[idx].ShallowCopy(displays[idx]);

+  }

+  delete[] m_simple_tags;

+  m_simple_tags = displays;

+  m_simple_tags_size = size;

+  return true;

+}

+Tags::SimpleTag::SimpleTag() {}

+Tags::SimpleTag::~SimpleTag() {}

+const char* Tags::SimpleTag::GetTagName() const { return m_tag_name; }

+const char* Tags::SimpleTag::GetTagString() const { return m_tag_string; }

+void Tags::SimpleTag::Init() {

+  m_tag_name = NULL;

+  m_tag_string = NULL;

+}

+void Tags::SimpleTag::ShallowCopy(SimpleTag& rhs) const {

+  rhs.m_tag_name = m_tag_name;

+  rhs.m_tag_string = m_tag_string;

+}

+void Tags::SimpleTag::Clear() {

+  delete[] m_tag_name;

+  m_tag_name = NULL;

+  delete[] m_tag_string;

+  m_tag_string = NULL;

+}

+long Tags::SimpleTag::Parse(IMkvReader* pReader, long long pos,

+                            long long size) {

+  const long long stop = pos + size;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)  // weird

+      continue;

+    if (id == libwebm::kMkvTagName) {

+      status = UnserializeString(pReader, pos, size, m_tag_name);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvTagString) {

+      status = UnserializeString(pReader, pos, size, m_tag_string);

+      if (status)

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+SegmentInfo::SegmentInfo(Segment* pSegment, long long start, long long size_,

+                         long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_start(start),

+      m_size(size_),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_pMuxingAppAsUTF8(NULL),

+      m_pWritingAppAsUTF8(NULL),

+      m_pTitleAsUTF8(NULL) {}

+SegmentInfo::~SegmentInfo() {

+  delete[] m_pMuxingAppAsUTF8;

+  m_pMuxingAppAsUTF8 = NULL;

+  delete[] m_pWritingAppAsUTF8;

+  m_pWritingAppAsUTF8 = NULL;

+  delete[] m_pTitleAsUTF8;

+  m_pTitleAsUTF8 = NULL;

+}

+long SegmentInfo::Parse() {

+  assert(m_pMuxingAppAsUTF8 == NULL);

+  assert(m_pWritingAppAsUTF8 == NULL);

+  assert(m_pTitleAsUTF8 == NULL);

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = m_start;

+  const long long stop = m_start + m_size;

+  m_timecodeScale = 1000000;

+  m_duration = -1;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvTimecodeScale) {

+      m_timecodeScale = UnserializeUInt(pReader, pos, size);

+      if (m_timecodeScale <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDuration) {

+      const long status = UnserializeFloat(pReader, pos, size, m_duration);

+      if (status < 0)

+        return status;

+      if (m_duration < 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvMuxingApp) {

+      const long status =

+          UnserializeString(pReader, pos, size, m_pMuxingAppAsUTF8);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvWritingApp) {

+      const long status =

+          UnserializeString(pReader, pos, size, m_pWritingAppAsUTF8);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvTitle) {

+      const long status = UnserializeString(pReader, pos, size, m_pTitleAsUTF8);

+      if (status)

+        return status;

+    }

+    pos += size;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  const double rollover_check = m_duration * m_timecodeScale;

+  if (rollover_check > LLONG_MAX)

+    return E_FILE_FORMAT_INVALID;

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long long SegmentInfo::GetTimeCodeScale() const { return m_timecodeScale; }

+long long SegmentInfo::GetDuration() const {

+  if (m_duration < 0)

+    return -1;

+  assert(m_timecodeScale >= 1);

+  const double dd = double(m_duration) * double(m_timecodeScale);

+  const long long d = static_cast<long long>(dd);

+  return d;

+}

+const char* SegmentInfo::GetMuxingAppAsUTF8() const {

+  return m_pMuxingAppAsUTF8;

+}

+const char* SegmentInfo::GetWritingAppAsUTF8() const {

+  return m_pWritingAppAsUTF8;

+}

+const char* SegmentInfo::GetTitleAsUTF8() const { return m_pTitleAsUTF8; }

+///////////////////////////////////////////////////////////////

+// ContentEncoding element

+ContentEncoding::ContentCompression::ContentCompression()

+    : algo(0), settings(NULL), settings_len(0) {}

+ContentEncoding::ContentCompression::~ContentCompression() {

+  delete[] settings;

+}

+ContentEncoding::ContentEncryption::ContentEncryption()

+    : algo(0),

+      key_id(NULL),

+      key_id_len(0),

+      signature(NULL),

+      signature_len(0),

+      sig_key_id(NULL),

+      sig_key_id_len(0),

+      sig_algo(0),

+      sig_hash_algo(0) {}

+ContentEncoding::ContentEncryption::~ContentEncryption() {

+  delete[] key_id;

+  delete[] signature;

+  delete[] sig_key_id;

+}

+ContentEncoding::ContentEncoding()

+    : compression_entries_(NULL),

+      compression_entries_end_(NULL),

+      encryption_entries_(NULL),

+      encryption_entries_end_(NULL),

+      encoding_order_(0),

+      encoding_scope_(1),

+      encoding_type_(0) {}

+ContentEncoding::~ContentEncoding() {

+  ContentCompression** comp_i = compression_entries_;

+  ContentCompression** const comp_j = compression_entries_end_;

+  while (comp_i != comp_j) {

+    ContentCompression* const comp = *comp_i++;

+    delete comp;

+  }

+  delete[] compression_entries_;

+  ContentEncryption** enc_i = encryption_entries_;

+  ContentEncryption** const enc_j = encryption_entries_end_;

+  while (enc_i != enc_j) {

+    ContentEncryption* const enc = *enc_i++;

+    delete enc;

+  }

+  delete[] encryption_entries_;

+}

+const ContentEncoding::ContentCompression*

+    ContentEncoding::GetCompressionByIndex(unsigned long idx) const {

+  const ptrdiff_t count = compression_entries_end_ - compression_entries_;

+  assert(count >= 0);

+  if (idx >= static_cast<unsigned long>(count))

+    return NULL;

+  return compression_entries_[idx];

+}

+unsigned long ContentEncoding::GetCompressionCount() const {

+  const ptrdiff_t count = compression_entries_end_ - compression_entries_;

+  assert(count >= 0);

+  return static_cast<unsigned long>(count);

+}

+const ContentEncoding::ContentEncryption* ContentEncoding::GetEncryptionByIndex(

+    unsigned long idx) const {

+  const ptrdiff_t count = encryption_entries_end_ - encryption_entries_;

+  assert(count >= 0);

+  if (idx >= static_cast<unsigned long>(count))

+    return NULL;

+  return encryption_entries_[idx];

+}

+unsigned long ContentEncoding::GetEncryptionCount() const {

+  const ptrdiff_t count = encryption_entries_end_ - encryption_entries_;

+  assert(count >= 0);

+  return static_cast<unsigned long>(count);

+}

+long ContentEncoding::ParseContentEncAESSettingsEntry(

+    long long start, long long size, IMkvReader* pReader,

+    ContentEncAESSettings* aes) {

+  assert(pReader);

+  assert(aes);

+  long long pos = start;

+  const long long stop = start + size;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvAESSettingsCipherMode) {

+      aes->cipher_mode = UnserializeUInt(pReader, pos, size);

+      if (aes->cipher_mode != 1)

+        return E_FILE_FORMAT_INVALID;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  return 0;

+}

+long ContentEncoding::ParseContentEncodingEntry(long long start, long long size,

+                                                IMkvReader* pReader) {

+  assert(pReader);

+  long long pos = start;

+  const long long stop = start + size;

+  // Count ContentCompression and ContentEncryption elements.

+  int compression_count = 0;

+  int encryption_count = 0;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvContentCompression)

+      ++compression_count;

+    if (id == libwebm::kMkvContentEncryption)

+      ++encryption_count;

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (compression_count <= 0 && encryption_count <= 0)

+    return -1;

+  if (compression_count > 0) {

+    compression_entries_ =

+        new (std::nothrow) ContentCompression*[compression_count];

+    if (!compression_entries_)

+      return -1;

+    compression_entries_end_ = compression_entries_;

+  }

+  if (encryption_count > 0) {

+    encryption_entries_ =

+        new (std::nothrow) ContentEncryption*[encryption_count];

+    if (!encryption_entries_) {

+      delete[] compression_entries_;

+      return -1;

+    }

+    encryption_entries_end_ = encryption_entries_;

+  }

+  pos = start;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvContentEncodingOrder) {

+      encoding_order_ = UnserializeUInt(pReader, pos, size);

+    } else if (id == libwebm::kMkvContentEncodingScope) {

+      encoding_scope_ = UnserializeUInt(pReader, pos, size);

+      if (encoding_scope_ < 1)

+        return -1;

+    } else if (id == libwebm::kMkvContentEncodingType) {

+      encoding_type_ = UnserializeUInt(pReader, pos, size);

+    } else if (id == libwebm::kMkvContentCompression) {

+      ContentCompression* const compression =

+          new (std::nothrow) ContentCompression();

+      if (!compression)

+        return -1;

+      status = ParseCompressionEntry(pos, size, pReader, compression);

+      if (status) {

+        delete compression;

+        return status;

+      }

+      *compression_entries_end_++ = compression;

+    } else if (id == libwebm::kMkvContentEncryption) {

+      ContentEncryption* const encryption =

+          new (std::nothrow) ContentEncryption();

+      if (!encryption)

+        return -1;

+      status = ParseEncryptionEntry(pos, size, pReader, encryption);

+      if (status) {

+        delete encryption;

+        return status;

+      }

+      *encryption_entries_end_++ = encryption;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long ContentEncoding::ParseCompressionEntry(long long start, long long size,

+                                            IMkvReader* pReader,

+                                            ContentCompression* compression) {

+  assert(pReader);

+  assert(compression);

+  long long pos = start;

+  const long long stop = start + size;

+  bool valid = false;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvContentCompAlgo) {

+      long long algo = UnserializeUInt(pReader, pos, size);

+      if (algo < 0)

+        return E_FILE_FORMAT_INVALID;

+      compression->algo = algo;

+      valid = true;

+    } else if (id == libwebm::kMkvContentCompSettings) {

+      if (size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      const size_t buflen = static_cast<size_t>(size);

+      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

+      if (buf == NULL)

+        return -1;

+      const int read_status =

+          pReader->Read(pos, static_cast<long>(buflen), buf);

+      if (read_status) {

+        delete[] buf;

+        return status;

+      }

+      compression->settings = buf;

+      compression->settings_len = buflen;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  // ContentCompAlgo is mandatory

+  if (!valid)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+long ContentEncoding::ParseEncryptionEntry(long long start, long long size,

+                                           IMkvReader* pReader,

+                                           ContentEncryption* encryption) {

+  assert(pReader);

+  assert(encryption);

+  long long pos = start;

+  const long long stop = start + size;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvContentEncAlgo) {

+      encryption->algo = UnserializeUInt(pReader, pos, size);

+      if (encryption->algo != 5)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvContentEncKeyID) {

+      delete[] encryption->key_id;

+      encryption->key_id = NULL;

+      encryption->key_id_len = 0;

+      if (size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      const size_t buflen = static_cast<size_t>(size);

+      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

+      if (buf == NULL)

+        return -1;

+      const int read_status =

+          pReader->Read(pos, static_cast<long>(buflen), buf);

+      if (read_status) {

+        delete[] buf;

+        return status;

+      }

+      encryption->key_id = buf;

+      encryption->key_id_len = buflen;

+    } else if (id == libwebm::kMkvContentSignature) {

+      delete[] encryption->signature;

+      encryption->signature = NULL;

+      encryption->signature_len = 0;

+      if (size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      const size_t buflen = static_cast<size_t>(size);

+      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

+      if (buf == NULL)

+        return -1;

+      const int read_status =

+          pReader->Read(pos, static_cast<long>(buflen), buf);

+      if (read_status) {

+        delete[] buf;

+        return status;

+      }

+      encryption->signature = buf;

+      encryption->signature_len = buflen;

+    } else if (id == libwebm::kMkvContentSigKeyID) {

+      delete[] encryption->sig_key_id;

+      encryption->sig_key_id = NULL;

+      encryption->sig_key_id_len = 0;

+      if (size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      const size_t buflen = static_cast<size_t>(size);

+      unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

+      if (buf == NULL)

+        return -1;

+      const int read_status =

+          pReader->Read(pos, static_cast<long>(buflen), buf);

+      if (read_status) {

+        delete[] buf;

+        return status;

+      }

+      encryption->sig_key_id = buf;

+      encryption->sig_key_id_len = buflen;

+    } else if (id == libwebm::kMkvContentSigAlgo) {

+      encryption->sig_algo = UnserializeUInt(pReader, pos, size);

+    } else if (id == libwebm::kMkvContentSigHashAlgo) {

+      encryption->sig_hash_algo = UnserializeUInt(pReader, pos, size);

+    } else if (id == libwebm::kMkvContentEncAESSettings) {

+      const long status = ParseContentEncAESSettingsEntry(

+          pos, size, pReader, &encryption->aes_settings);

+      if (status)

+        return status;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  return 0;

+}

+Track::Track(Segment* pSegment, long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      content_encoding_entries_(NULL),

+      content_encoding_entries_end_(NULL) {}

+Track::~Track() {

+  Info& info = const_cast<Info&>(m_info);

+  info.Clear();

+  ContentEncoding** i = content_encoding_entries_;

+  ContentEncoding** const j = content_encoding_entries_end_;

+  while (i != j) {

+    ContentEncoding* const encoding = *i++;

+    delete encoding;

+  }

+  delete[] content_encoding_entries_;

+}

+long Track::Create(Segment* pSegment, const Info& info, long long element_start,

+                   long long element_size, Track*& pResult) {

+  if (pResult)

+    return -1;

+  Track* const pTrack =

+      new (std::nothrow) Track(pSegment, element_start, element_size);

+  if (pTrack == NULL)

+    return -1;  // generic error

+  const int status = info.Copy(pTrack->m_info);

+  if (status) {  // error

+    delete pTrack;

+    return status;

+  }

+  pResult = pTrack;

+  return 0;  // success

+}

+Track::Info::Info()

+    : uid(0),

+      defaultDuration(0),

+      codecDelay(0),

+      seekPreRoll(0),

+      nameAsUTF8(NULL),

+      language(NULL),

+      codecId(NULL),

+      codecNameAsUTF8(NULL),

+      codecPrivate(NULL),

+      codecPrivateSize(0),

+      lacing(false) {}

+Track::Info::~Info() { Clear(); }

+void Track::Info::Clear() {

+  delete[] nameAsUTF8;

+  nameAsUTF8 = NULL;

+  delete[] language;

+  language = NULL;

+  delete[] codecId;

+  codecId = NULL;

+  delete[] codecPrivate;

+  codecPrivate = NULL;

+  codecPrivateSize = 0;

+  delete[] codecNameAsUTF8;

+  codecNameAsUTF8 = NULL;

+}

+int Track::Info::CopyStr(char* Info::*str, Info& dst_) const {

+  if (str == static_cast<char * Info::*>(NULL))

+    return -1;

+  char*& dst = dst_.*str;

+  if (dst)  // should be NULL already

+    return -1;

+  const char* const src = this->*str;

+  if (src == NULL)

+    return 0;

+  const size_t len = strlen(src);

+  dst = SafeArrayAlloc<char>(1, len + 1);

+  if (dst == NULL)

+    return -1;

+  strcpy(dst, src);

+  return 0;

+}

+int Track::Info::Copy(Info& dst) const {

+  if (&dst == this)

+    return 0;

+  dst.type = type;

+  dst.number = number;

+  dst.defaultDuration = defaultDuration;

+  dst.codecDelay = codecDelay;

+  dst.seekPreRoll = seekPreRoll;

+  dst.uid = uid;

+  dst.lacing = lacing;

+  dst.settings = settings;

+  // We now copy the string member variables from src to dst.

+  // This involves memory allocation so in principle the operation

+  // can fail (indeed, that's why we have Info::Copy), so we must

+  // report this to the caller.  An error return from this function

+  // therefore implies that the copy was only partially successful.

+  if (int status = CopyStr(&Info::nameAsUTF8, dst))

+    return status;

+  if (int status = CopyStr(&Info::language, dst))

+    return status;

+  if (int status = CopyStr(&Info::codecId, dst))

+    return status;

+  if (int status = CopyStr(&Info::codecNameAsUTF8, dst))

+    return status;

+  if (codecPrivateSize > 0) {

+    if (codecPrivate == NULL)

+      return -1;

+    if (dst.codecPrivate)

+      return -1;

+    if (dst.codecPrivateSize != 0)

+      return -1;

+    dst.codecPrivate = SafeArrayAlloc<unsigned char>(1, codecPrivateSize);

+    if (dst.codecPrivate == NULL)

+      return -1;

+    memcpy(dst.codecPrivate, codecPrivate, codecPrivateSize);

+    dst.codecPrivateSize = codecPrivateSize;

+  }

+  return 0;

+}

+const BlockEntry* Track::GetEOS() const { return &m_eos; }

+long Track::GetType() const { return m_info.type; }

+long Track::GetNumber() const { return m_info.number; }

+unsigned long long Track::GetUid() const { return m_info.uid; }

+const char* Track::GetNameAsUTF8() const { return m_info.nameAsUTF8; }

+const char* Track::GetLanguage() const { return m_info.language; }

+const char* Track::GetCodecNameAsUTF8() const { return m_info.codecNameAsUTF8; }

+const char* Track::GetCodecId() const { return m_info.codecId; }

+const unsigned char* Track::GetCodecPrivate(size_t& size) const {

+  size = m_info.codecPrivateSize;

+  return m_info.codecPrivate;

+}

+bool Track::GetLacing() const { return m_info.lacing; }

+unsigned long long Track::GetDefaultDuration() const {

+  return m_info.defaultDuration;

+}

+unsigned long long Track::GetCodecDelay() const { return m_info.codecDelay; }

+unsigned long long Track::GetSeekPreRoll() const { return m_info.seekPreRoll; }

+long Track::GetFirst(const BlockEntry*& pBlockEntry) const {

+  const Cluster* pCluster = m_pSegment->GetFirst();

+  for (int i = 0;;) {

+    if (pCluster == NULL) {

+      pBlockEntry = GetEOS();

+      return 1;

+    }

+    if (pCluster->EOS()) {

+      if (m_pSegment->DoneParsing()) {

+        pBlockEntry = GetEOS();

+        return 1;

+      }

+      pBlockEntry = 0;

+      return E_BUFFER_NOT_FULL;

+    }

+    long status = pCluster->GetFirst(pBlockEntry);

+    if (status < 0)  // error

+      return status;

+    if (pBlockEntry == 0) {  // empty cluster

+      pCluster = m_pSegment->GetNext(pCluster);

+      continue;

+    }

+    for (;;) {

+      const Block* const pBlock = pBlockEntry->GetBlock();

+      assert(pBlock);

+      const long long tn = pBlock->GetTrackNumber();

+      if ((tn == m_info.number) && VetEntry(pBlockEntry))

+        return 0;

+      const BlockEntry* pNextEntry;

+      status = pCluster->GetNext(pBlockEntry, pNextEntry);

+      if (status < 0)  // error

+        return status;

+      if (pNextEntry == 0)

+        break;

+      pBlockEntry = pNextEntry;

+    }

+    ++i;

+    if (i >= 100)

+      break;

+    pCluster = m_pSegment->GetNext(pCluster);

+  }

+  // NOTE: if we get here, it means that we didn't find a block with

+  // a matching track number.  We interpret that as an error (which

+  // might be too conservative).

+  pBlockEntry = GetEOS();  // so we can return a non-NULL value

+  return 1;

+}

+long Track::GetNext(const BlockEntry* pCurrEntry,

+                    const BlockEntry*& pNextEntry) const {

+  assert(pCurrEntry);

+  assert(!pCurrEntry->EOS());  //?

+  const Block* const pCurrBlock = pCurrEntry->GetBlock();

+  assert(pCurrBlock && pCurrBlock->GetTrackNumber() == m_info.number);

+  if (!pCurrBlock || pCurrBlock->GetTrackNumber() != m_info.number)

+    return -1;

+  const Cluster* pCluster = pCurrEntry->GetCluster();

+  assert(pCluster);

+  assert(!pCluster->EOS());

+  long status = pCluster->GetNext(pCurrEntry, pNextEntry);

+  if (status < 0)  // error

+    return status;

+  for (int i = 0;;) {

+    while (pNextEntry) {

+      const Block* const pNextBlock = pNextEntry->GetBlock();

+      assert(pNextBlock);

+      if (pNextBlock->GetTrackNumber() == m_info.number)

+        return 0;

+      pCurrEntry = pNextEntry;

+      status = pCluster->GetNext(pCurrEntry, pNextEntry);

+      if (status < 0)  // error

+        return status;

+    }

+    pCluster = m_pSegment->GetNext(pCluster);

+    if (pCluster == NULL) {

+      pNextEntry = GetEOS();

+      return 1;

+    }

+    if (pCluster->EOS()) {

+      if (m_pSegment->DoneParsing()) {

+        pNextEntry = GetEOS();

+        return 1;

+      }

+      // TODO: there is a potential O(n^2) problem here: we tell the

+      // caller to (pre)load another cluster, which he does, but then he

+      // calls GetNext again, which repeats the same search.  This is

+      // a pathological case, since the only way it can happen is if

+      // there exists a long sequence of clusters none of which contain a

+      // block from this track.  One way around this problem is for the

+      // caller to be smarter when he loads another cluster: don't call

+      // us back until you have a cluster that contains a block from this

+      // track. (Of course, that's not cheap either, since our caller

+      // would have to scan the each cluster as it's loaded, so that

+      // would just push back the problem.)

+      pNextEntry = NULL;

+      return E_BUFFER_NOT_FULL;

+    }

+    status = pCluster->GetFirst(pNextEntry);

+    if (status < 0)  // error

+      return status;

+    if (pNextEntry == NULL)  // empty cluster

+      continue;

+    ++i;

+    if (i >= 100)

+      break;

+  }

+  // NOTE: if we get here, it means that we didn't find a block with

+  // a matching track number after lots of searching, so we give

+  // up trying.

+  pNextEntry = GetEOS();  // so we can return a non-NULL value

+  return 1;

+}

+bool Track::VetEntry(const BlockEntry* pBlockEntry) const {

+  assert(pBlockEntry);

+  const Block* const pBlock = pBlockEntry->GetBlock();

+  assert(pBlock);

+  assert(pBlock->GetTrackNumber() == m_info.number);

+  if (!pBlock || pBlock->GetTrackNumber() != m_info.number)

+    return false;

+  // This function is used during a seek to determine whether the

+  // frame is a valid seek target.  This default function simply

+  // returns true, which means all frames are valid seek targets.

+  // It gets overridden by the VideoTrack class, because only video

+  // keyframes can be used as seek target.

+  return true;

+}

+long Track::Seek(long long time_ns, const BlockEntry*& pResult) const {

+  const long status = GetFirst(pResult);

+  if (status < 0)  // buffer underflow, etc

+    return status;

+  assert(pResult);

+  if (pResult->EOS())

+    return 0;

+  const Cluster* pCluster = pResult->GetCluster();

+  assert(pCluster);

+  assert(pCluster->GetIndex() >= 0);

+  if (time_ns <= pResult->GetBlock()->GetTime(pCluster))

+    return 0;

+  Cluster** const clusters = m_pSegment->m_clusters;

+  assert(clusters);

+  const long count = m_pSegment->GetCount();  // loaded only, not preloaded

+  assert(count > 0);

+  Cluster** const i = clusters + pCluster->GetIndex();

+  assert(i);

+  assert(*i == pCluster);

+  assert(pCluster->GetTime() <= time_ns);

+  Cluster** const j = clusters + count;

+  Cluster** lo = i;

+  Cluster** hi = j;

+  while (lo < hi) {

+    // INVARIANT:

+    //[i, lo) <= time_ns

+    //[lo, hi) ?

+    //[hi, j)  > time_ns

+    Cluster** const mid = lo + (hi - lo) / 2;

+    assert(mid < hi);

+    pCluster = *mid;

+    assert(pCluster);

+    assert(pCluster->GetIndex() >= 0);

+    assert(pCluster->GetIndex() == long(mid - m_pSegment->m_clusters));

+    const long long t = pCluster->GetTime();

+    if (t <= time_ns)

+      lo = mid + 1;

+    else

+      hi = mid;

+    assert(lo <= hi);

+  }

+  assert(lo == hi);

+  assert(lo > i);

+  assert(lo <= j);

+  while (lo > i) {

+    pCluster = *--lo;

+    assert(pCluster);

+    assert(pCluster->GetTime() <= time_ns);

+    pResult = pCluster->GetEntry(this);

+    if ((pResult != 0) && !pResult->EOS())

+      return 0;

+    // landed on empty cluster (no entries)

+  }

+  pResult = GetEOS();  // weird

+  return 0;

+}

+const ContentEncoding* Track::GetContentEncodingByIndex(

+    unsigned long idx) const {

+  const ptrdiff_t count =

+      content_encoding_entries_end_ - content_encoding_entries_;

+  assert(count >= 0);

+  if (idx >= static_cast<unsigned long>(count))

+    return NULL;

+  return content_encoding_entries_[idx];

+}

+unsigned long Track::GetContentEncodingCount() const {

+  const ptrdiff_t count =

+      content_encoding_entries_end_ - content_encoding_entries_;

+  assert(count >= 0);

+  return static_cast<unsigned long>(count);

+}

+long Track::ParseContentEncodingsEntry(long long start, long long size) {

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  assert(pReader);

+  long long pos = start;

+  const long long stop = start + size;

+  // Count ContentEncoding elements.

+  int count = 0;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    // pos now designates start of element

+    if (id == libwebm::kMkvContentEncoding)

+      ++count;

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (count <= 0)

+    return -1;

+  content_encoding_entries_ = new (std::nothrow) ContentEncoding*[count];

+  if (!content_encoding_entries_)

+    return -1;

+  content_encoding_entries_end_ = content_encoding_entries_;

+  pos = start;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    // pos now designates start of element

+    if (id == libwebm::kMkvContentEncoding) {

+      ContentEncoding* const content_encoding =

+          new (std::nothrow) ContentEncoding();

+      if (!content_encoding)

+        return -1;

+      status = content_encoding->ParseContentEncodingEntry(pos, size, pReader);

+      if (status) {

+        delete content_encoding;

+        return status;

+      }

+      *content_encoding_entries_end_++ = content_encoding;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;

+}

+Track::EOSBlock::EOSBlock() : BlockEntry(NULL, LONG_MIN) {}

+BlockEntry::Kind Track::EOSBlock::GetKind() const { return kBlockEOS; }

+const Block* Track::EOSBlock::GetBlock() const { return NULL; }

+bool PrimaryChromaticity::Parse(IMkvReader* reader, long long read_pos,

+                                long long value_size, bool is_x,

+                                PrimaryChromaticity** chromaticity) {

+  if (!reader)

+    return false;

+  std::auto_ptr<PrimaryChromaticity> chromaticity_ptr;

+  if (!*chromaticity) {

+    chromaticity_ptr.reset(new PrimaryChromaticity());

+  } else {

+    chromaticity_ptr.reset(*chromaticity);

+  }

+  if (!chromaticity_ptr.get())

+    return false;

+  float* value = is_x ? &chromaticity_ptr->x : &chromaticity_ptr->y;

+  double parser_value = 0;

+  const long long value_parse_status =

+      UnserializeFloat(reader, read_pos, value_size, parser_value);

+  *value = static_cast<float>(parser_value);

+  if (value_parse_status < 0 || *value < 0.0 || *value > 1.0)

+    return false;

+  *chromaticity = chromaticity_ptr.release();

+  return true;

+}

+bool MasteringMetadata::Parse(IMkvReader* reader, long long mm_start,

+                              long long mm_size, MasteringMetadata** mm) {

+  if (!reader || *mm)

+    return false;

+  std::auto_ptr<MasteringMetadata> mm_ptr(new MasteringMetadata());

+  if (!mm_ptr.get())

+    return false;

+  const long long mm_end = mm_start + mm_size;

+  long long read_pos = mm_start;

+  while (read_pos < mm_end) {

+    long long child_id = 0;

+    long long child_size = 0;

+    const long long status =

+        ParseElementHeader(reader, read_pos, mm_end, child_id, child_size);

+    if (status < 0)

+      return false;

+    if (child_id == libwebm::kMkvLuminanceMax) {

+      double value = 0;

+      const long long value_parse_status =

+          UnserializeFloat(reader, read_pos, child_size, value);

+      mm_ptr->luminance_max = static_cast<float>(value);

+      if (value_parse_status < 0 || mm_ptr->luminance_max < 0.0 ||

+          mm_ptr->luminance_max > 9999.99) {

+        return false;

+      }

+    } else if (child_id == libwebm::kMkvLuminanceMin) {

+      double value = 0;

+      const long long value_parse_status =

+          UnserializeFloat(reader, read_pos, child_size, value);

+      mm_ptr->luminance_min = static_cast<float>(value);

+      if (value_parse_status < 0 || mm_ptr->luminance_min < 0.0 ||

+          mm_ptr->luminance_min > 999.9999) {

+        return false;

+      }

+    } else {

+      bool is_x = false;

+      PrimaryChromaticity** chromaticity;

+      switch (child_id) {

+        case libwebm::kMkvPrimaryRChromaticityX:

+        case libwebm::kMkvPrimaryRChromaticityY:

+          is_x = child_id == libwebm::kMkvPrimaryRChromaticityX;

+          chromaticity = &mm_ptr->r;

+          break;

+        case libwebm::kMkvPrimaryGChromaticityX:

+        case libwebm::kMkvPrimaryGChromaticityY:

+          is_x = child_id == libwebm::kMkvPrimaryGChromaticityX;

+          chromaticity = &mm_ptr->g;

+          break;

+        case libwebm::kMkvPrimaryBChromaticityX:

+        case libwebm::kMkvPrimaryBChromaticityY:

+          is_x = child_id == libwebm::kMkvPrimaryBChromaticityX;

+          chromaticity = &mm_ptr->b;

+          break;

+        case libwebm::kMkvWhitePointChromaticityX:

+        case libwebm::kMkvWhitePointChromaticityY:

+          is_x = child_id == libwebm::kMkvWhitePointChromaticityX;

+          chromaticity = &mm_ptr->white_point;

+          break;

+        default:

+          return false;

+      }

+      const bool value_parse_status = PrimaryChromaticity::Parse(

+          reader, read_pos, child_size, is_x, chromaticity);

+      if (!value_parse_status)

+        return false;

+    }

+    read_pos += child_size;

+    if (read_pos > mm_end)

+      return false;

+  }

+  *mm = mm_ptr.release();

+  return true;

+}

+bool Colour::Parse(IMkvReader* reader, long long colour_start,

+                   long long colour_size, Colour** colour) {

+  if (!reader || *colour)

+    return false;

+  std::auto_ptr<Colour> colour_ptr(new Colour());

+  if (!colour_ptr.get())

+    return false;

+  const long long colour_end = colour_start + colour_size;

+  long long read_pos = colour_start;

+  while (read_pos < colour_end) {

+    long long child_id = 0;

+    long long child_size = 0;

+    const long status =

+        ParseElementHeader(reader, read_pos, colour_end, child_id, child_size);

+    if (status < 0)

+      return false;

+    if (child_id == libwebm::kMkvMatrixCoefficients) {

+      colour_ptr->matrix_coefficients =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->matrix_coefficients < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvBitsPerChannel) {

+      colour_ptr->bits_per_channel =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->bits_per_channel < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvChromaSubsamplingHorz) {

+      colour_ptr->chroma_subsampling_horz =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->chroma_subsampling_horz < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvChromaSubsamplingVert) {

+      colour_ptr->chroma_subsampling_vert =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->chroma_subsampling_vert < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvCbSubsamplingHorz) {

+      colour_ptr->cb_subsampling_horz =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->cb_subsampling_horz < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvCbSubsamplingVert) {

+      colour_ptr->cb_subsampling_vert =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->cb_subsampling_vert < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvChromaSitingHorz) {

+      colour_ptr->chroma_siting_horz =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->chroma_siting_horz < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvChromaSitingVert) {

+      colour_ptr->chroma_siting_vert =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->chroma_siting_vert < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvRange) {

+      colour_ptr->range = UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->range < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvTransferCharacteristics) {

+      colour_ptr->transfer_characteristics =

+          UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->transfer_characteristics < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvPrimaries) {

+      colour_ptr->primaries = UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->primaries < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvMaxCLL) {

+      colour_ptr->max_cll = UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->max_cll < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvMaxFALL) {

+      colour_ptr->max_fall = UnserializeUInt(reader, read_pos, child_size);

+      if (colour_ptr->max_fall < 0)

+        return false;

+    } else if (child_id == libwebm::kMkvMasteringMetadata) {

+      if (!MasteringMetadata::Parse(reader, read_pos, child_size,

+                                    &colour_ptr->mastering_metadata))

+        return false;

+    } else {

+      return false;

+    }

+    read_pos += child_size;

+    if (read_pos > colour_end)

+      return false;

+  }

+  *colour = colour_ptr.release();

+  return true;

+}

+VideoTrack::VideoTrack(Segment* pSegment, long long element_start,

+                       long long element_size)

+    : Track(pSegment, element_start, element_size), m_colour(NULL) {}

+VideoTrack::~VideoTrack() { delete m_colour; }

+long VideoTrack::Parse(Segment* pSegment, const Info& info,

+                       long long element_start, long long element_size,

+                       VideoTrack*& pResult) {

+  if (pResult)

+    return -1;

+  if (info.type != Track::kVideo)

+    return -1;

+  long long width = 0;

+  long long height = 0;

+  long long display_width = 0;

+  long long display_height = 0;

+  long long display_unit = 0;

+  long long stereo_mode = 0;

+  double rate = 0.0;

+  IMkvReader* const pReader = pSegment->m_pReader;

+  const Settings& s = info.settings;

+  assert(s.start >= 0);

+  assert(s.size >= 0);

+  long long pos = s.start;

+  assert(pos >= 0);

+  const long long stop = pos + s.size;

+  Colour* colour = NULL;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvPixelWidth) {

+      width = UnserializeUInt(pReader, pos, size);

+      if (width <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvPixelHeight) {

+      height = UnserializeUInt(pReader, pos, size);

+      if (height <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDisplayWidth) {

+      display_width = UnserializeUInt(pReader, pos, size);

+      if (display_width <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDisplayHeight) {

+      display_height = UnserializeUInt(pReader, pos, size);

+      if (display_height <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvDisplayUnit) {

+      display_unit = UnserializeUInt(pReader, pos, size);

+      if (display_unit < 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvStereoMode) {

+      stereo_mode = UnserializeUInt(pReader, pos, size);

+      if (stereo_mode < 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvFrameRate) {

+      const long status = UnserializeFloat(pReader, pos, size, rate);

+      if (status < 0)

+        return status;

+      if (rate <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvColour) {

+      if (!Colour::Parse(pReader, pos, size, &colour))

+        return E_FILE_FORMAT_INVALID;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  VideoTrack* const pTrack =

+      new (std::nothrow) VideoTrack(pSegment, element_start, element_size);

+  if (pTrack == NULL)

+    return -1;  // generic error

+  const int status = info.Copy(pTrack->m_info);

+  if (status) {  // error

+    delete pTrack;

+    return status;

+  }

+  pTrack->m_width = width;

+  pTrack->m_height = height;

+  pTrack->m_display_width = display_width;

+  pTrack->m_display_height = display_height;

+  pTrack->m_display_unit = display_unit;

+  pTrack->m_stereo_mode = stereo_mode;

+  pTrack->m_rate = rate;

+  pTrack->m_colour = colour;

+  pResult = pTrack;

+  return 0;  // success

+}

+bool VideoTrack::VetEntry(const BlockEntry* pBlockEntry) const {

+  return Track::VetEntry(pBlockEntry) && pBlockEntry->GetBlock()->IsKey();

+}

+long VideoTrack::Seek(long long time_ns, const BlockEntry*& pResult) const {

+  const long status = GetFirst(pResult);

+  if (status < 0)  // buffer underflow, etc

+    return status;

+  assert(pResult);

+  if (pResult->EOS())

+    return 0;

+  const Cluster* pCluster = pResult->GetCluster();

+  assert(pCluster);

+  assert(pCluster->GetIndex() >= 0);

+  if (time_ns <= pResult->GetBlock()->GetTime(pCluster))

+    return 0;

+  Cluster** const clusters = m_pSegment->m_clusters;

+  assert(clusters);

+  const long count = m_pSegment->GetCount();  // loaded only, not pre-loaded

+  assert(count > 0);

+  Cluster** const i = clusters + pCluster->GetIndex();

+  assert(i);

+  assert(*i == pCluster);

+  assert(pCluster->GetTime() <= time_ns);

+  Cluster** const j = clusters + count;

+  Cluster** lo = i;

+  Cluster** hi = j;

+  while (lo < hi) {

+    // INVARIANT:

+    //[i, lo) <= time_ns

+    //[lo, hi) ?

+    //[hi, j)  > time_ns

+    Cluster** const mid = lo + (hi - lo) / 2;

+    assert(mid < hi);

+    pCluster = *mid;

+    assert(pCluster);

+    assert(pCluster->GetIndex() >= 0);

+    assert(pCluster->GetIndex() == long(mid - m_pSegment->m_clusters));

+    const long long t = pCluster->GetTime();

+    if (t <= time_ns)

+      lo = mid + 1;

+    else

+      hi = mid;

+    assert(lo <= hi);

+  }

+  assert(lo == hi);

+  assert(lo > i);

+  assert(lo <= j);

+  pCluster = *--lo;

+  assert(pCluster);

+  assert(pCluster->GetTime() <= time_ns);

+  pResult = pCluster->GetEntry(this, time_ns);

+  if ((pResult != 0) && !pResult->EOS())  // found a keyframe

+    return 0;

+  while (lo != i) {

+    pCluster = *--lo;

+    assert(pCluster);

+    assert(pCluster->GetTime() <= time_ns);

+    pResult = pCluster->GetEntry(this, time_ns);

+    if ((pResult != 0) && !pResult->EOS())

+      return 0;

+  }

+  // weird: we're on the first cluster, but no keyframe found

+  // should never happen but we must return something anyway

+  pResult = GetEOS();

+  return 0;

+}

+Colour* VideoTrack::GetColour() const { return m_colour; }

+long long VideoTrack::GetWidth() const { return m_width; }

+long long VideoTrack::GetHeight() const { return m_height; }

+long long VideoTrack::GetDisplayWidth() const {

+  return m_display_width > 0 ? m_display_width : GetWidth();

+}

+long long VideoTrack::GetDisplayHeight() const {

+  return m_display_height > 0 ? m_display_height : GetHeight();

+}

+long long VideoTrack::GetDisplayUnit() const { return m_display_unit; }

+long long VideoTrack::GetStereoMode() const { return m_stereo_mode; }

+double VideoTrack::GetFrameRate() const { return m_rate; }

+AudioTrack::AudioTrack(Segment* pSegment, long long element_start,

+                       long long element_size)

+    : Track(pSegment, element_start, element_size) {}

+long AudioTrack::Parse(Segment* pSegment, const Info& info,

+                       long long element_start, long long element_size,

+                       AudioTrack*& pResult) {

+  if (pResult)

+    return -1;

+  if (info.type != Track::kAudio)

+    return -1;

+  IMkvReader* const pReader = pSegment->m_pReader;

+  const Settings& s = info.settings;

+  assert(s.start >= 0);

+  assert(s.size >= 0);

+  long long pos = s.start;

+  assert(pos >= 0);

+  const long long stop = pos + s.size;

+  double rate = 8000.0;  // MKV default

+  long long channels = 1;

+  long long bit_depth = 0;

+  while (pos < stop) {

+    long long id, size;

+    long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (id == libwebm::kMkvSamplingFrequency) {

+      status = UnserializeFloat(pReader, pos, size, rate);

+      if (status < 0)

+        return status;

+      if (rate <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvChannels) {

+      channels = UnserializeUInt(pReader, pos, size);

+      if (channels <= 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvBitDepth) {

+      bit_depth = UnserializeUInt(pReader, pos, size);

+      if (bit_depth <= 0)

+        return E_FILE_FORMAT_INVALID;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  AudioTrack* const pTrack =

+      new (std::nothrow) AudioTrack(pSegment, element_start, element_size);

+  if (pTrack == NULL)

+    return -1;  // generic error

+  const int status = info.Copy(pTrack->m_info);

+  if (status) {

+    delete pTrack;

+    return status;

+  }

+  pTrack->m_rate = rate;

+  pTrack->m_channels = channels;

+  pTrack->m_bitDepth = bit_depth;

+  pResult = pTrack;

+  return 0;  // success

+}

+double AudioTrack::GetSamplingRate() const { return m_rate; }

+long long AudioTrack::GetChannels() const { return m_channels; }

+long long AudioTrack::GetBitDepth() const { return m_bitDepth; }

+Tracks::Tracks(Segment* pSegment, long long start, long long size_,

+               long long element_start, long long element_size)

+    : m_pSegment(pSegment),

+      m_start(start),

+      m_size(size_),

+      m_element_start(element_start),

+      m_element_size(element_size),

+      m_trackEntries(NULL),

+      m_trackEntriesEnd(NULL) {}

+long Tracks::Parse() {

+  assert(m_trackEntries == NULL);

+  assert(m_trackEntriesEnd == NULL);

+  const long long stop = m_start + m_size;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  int count = 0;

+  long long pos = m_start;

+  while (pos < stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size == 0)  // weird

+      continue;

+    if (id == libwebm::kMkvTrackEntry)

+      ++count;

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  if (count <= 0)

+    return 0;  // success

+  m_trackEntries = new (std::nothrow) Track*[count];

+  if (m_trackEntries == NULL)

+    return -1;

+  m_trackEntriesEnd = m_trackEntries;

+  pos = m_start;

+  while (pos < stop) {

+    const long long element_start = pos;

+    long long id, payload_size;

+    const long status =

+        ParseElementHeader(pReader, pos, stop, id, payload_size);

+    if (status < 0)  // error

+      return status;

+    if (payload_size == 0)  // weird

+      continue;

+    const long long payload_stop = pos + payload_size;

+    assert(payload_stop <= stop);  // checked in ParseElement

+    const long long element_size = payload_stop - element_start;

+    if (id == libwebm::kMkvTrackEntry) {

+      Track*& pTrack = *m_trackEntriesEnd;

+      pTrack = NULL;

+      const long status = ParseTrackEntry(pos, payload_size, element_start,

+                                          element_size, pTrack);

+      if (status)

+        return status;

+      if (pTrack)

+        ++m_trackEntriesEnd;

+    }

+    pos = payload_stop;

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  return 0;  // success

+}

+unsigned long Tracks::GetTracksCount() const {

+  const ptrdiff_t result = m_trackEntriesEnd - m_trackEntries;

+  assert(result >= 0);

+  return static_cast<unsigned long>(result);

+}

+long Tracks::ParseTrackEntry(long long track_start, long long track_size,

+                             long long element_start, long long element_size,

+                             Track*& pResult) const {

+  if (pResult)

+    return -1;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = track_start;

+  const long long track_stop = track_start + track_size;

+  Track::Info info;

+  info.type = 0;

+  info.number = 0;

+  info.uid = 0;

+  info.defaultDuration = 0;

+  Track::Settings v;

+  v.start = -1;

+  v.size = -1;

+  Track::Settings a;

+  a.start = -1;

+  a.size = -1;

+  Track::Settings e;  // content_encodings_settings;

+  e.start = -1;

+  e.size = -1;

+  long long lacing = 1;  // default is true

+  while (pos < track_stop) {

+    long long id, size;

+    const long status = ParseElementHeader(pReader, pos, track_stop, id, size);

+    if (status < 0)  // error

+      return status;

+    if (size < 0)

+      return E_FILE_FORMAT_INVALID;

+    const long long start = pos;

+    if (id == libwebm::kMkvVideo) {

+      v.start = start;

+      v.size = size;

+    } else if (id == libwebm::kMkvAudio) {

+      a.start = start;

+      a.size = size;

+    } else if (id == libwebm::kMkvContentEncodings) {

+      e.start = start;

+      e.size = size;

+    } else if (id == libwebm::kMkvTrackUID) {

+      if (size > 8)

+        return E_FILE_FORMAT_INVALID;

+      info.uid = 0;

+      long long pos_ = start;

+      const long long pos_end = start + size;

+      while (pos_ != pos_end) {

+        unsigned char b;

+        const int status = pReader->Read(pos_, 1, &b);

+        if (status)

+          return status;

+        info.uid <<= 8;

+        info.uid |= b;

+        ++pos_;

+      }

+    } else if (id == libwebm::kMkvTrackNumber) {

+      const long long num = UnserializeUInt(pReader, pos, size);

+      if ((num <= 0) || (num > 127))

+        return E_FILE_FORMAT_INVALID;

+      info.number = static_cast<long>(num);

+    } else if (id == libwebm::kMkvTrackType) {

+      const long long type = UnserializeUInt(pReader, pos, size);

+      if ((type <= 0) || (type > 254))

+        return E_FILE_FORMAT_INVALID;

+      info.type = static_cast<long>(type);

+    } else if (id == libwebm::kMkvName) {

+      const long status =

+          UnserializeString(pReader, pos, size, info.nameAsUTF8);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvLanguage) {

+      const long status = UnserializeString(pReader, pos, size, info.language);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvDefaultDuration) {

+      const long long duration = UnserializeUInt(pReader, pos, size);

+      if (duration < 0)

+        return E_FILE_FORMAT_INVALID;

+      info.defaultDuration = static_cast<unsigned long long>(duration);

+    } else if (id == libwebm::kMkvCodecID) {

+      const long status = UnserializeString(pReader, pos, size, info.codecId);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvFlagLacing) {

+      lacing = UnserializeUInt(pReader, pos, size);

+      if ((lacing < 0) || (lacing > 1))

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvCodecPrivate) {

+      delete[] info.codecPrivate;

+      info.codecPrivate = NULL;

+      info.codecPrivateSize = 0;

+      const size_t buflen = static_cast<size_t>(size);

+      if (buflen) {

+        unsigned char* buf = SafeArrayAlloc<unsigned char>(1, buflen);

+        if (buf == NULL)

+          return -1;

+        const int status = pReader->Read(pos, static_cast<long>(buflen), buf);

+        if (status) {

+          delete[] buf;

+          return status;

+        }

+        info.codecPrivate = buf;

+        info.codecPrivateSize = buflen;

+      }

+    } else if (id == libwebm::kMkvCodecName) {

+      const long status =

+          UnserializeString(pReader, pos, size, info.codecNameAsUTF8);

+      if (status)

+        return status;

+    } else if (id == libwebm::kMkvCodecDelay) {

+      info.codecDelay = UnserializeUInt(pReader, pos, size);

+    } else if (id == libwebm::kMkvSeekPreRoll) {

+      info.seekPreRoll = UnserializeUInt(pReader, pos, size);

+    }

+    pos += size;  // consume payload

+    if (pos > track_stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != track_stop)

+    return E_FILE_FORMAT_INVALID;

+  if (info.number <= 0)  // not specified

+    return E_FILE_FORMAT_INVALID;

+  if (GetTrackByNumber(info.number))

+    return E_FILE_FORMAT_INVALID;

+  if (info.type <= 0)  // not specified

+    return E_FILE_FORMAT_INVALID;

+  info.lacing = (lacing > 0) ? true : false;

+  if (info.type == Track::kVideo) {

+    if (v.start < 0)

+      return E_FILE_FORMAT_INVALID;

+    if (a.start >= 0)

+      return E_FILE_FORMAT_INVALID;

+    info.settings = v;

+    VideoTrack* pTrack = NULL;

+    const long status = VideoTrack::Parse(m_pSegment, info, element_start,

+                                          element_size, pTrack);

+    if (status)

+      return status;

+    pResult = pTrack;

+    assert(pResult);

+    if (e.start >= 0)

+      pResult->ParseContentEncodingsEntry(e.start, e.size);

+  } else if (info.type == Track::kAudio) {

+    if (a.start < 0)

+      return E_FILE_FORMAT_INVALID;

+    if (v.start >= 0)

+      return E_FILE_FORMAT_INVALID;

+    info.settings = a;

+    AudioTrack* pTrack = NULL;

+    const long status = AudioTrack::Parse(m_pSegment, info, element_start,

+                                          element_size, pTrack);

+    if (status)

+      return status;

+    pResult = pTrack;

+    assert(pResult);

+    if (e.start >= 0)

+      pResult->ParseContentEncodingsEntry(e.start, e.size);

+  } else {

+    // neither video nor audio - probably metadata or subtitles

+    if (a.start >= 0)

+      return E_FILE_FORMAT_INVALID;

+    if (v.start >= 0)

+      return E_FILE_FORMAT_INVALID;

+    if (info.type == Track::kMetadata && e.start >= 0)

+      return E_FILE_FORMAT_INVALID;

+    info.settings.start = -1;

+    info.settings.size = 0;

+    Track* pTrack = NULL;

+    const long status =

+        Track::Create(m_pSegment, info, element_start, element_size, pTrack);

+    if (status)

+      return status;

+    pResult = pTrack;

+    assert(pResult);

+  }

+  return 0;  // success

+}

+Tracks::~Tracks() {

+  Track** i = m_trackEntries;

+  Track** const j = m_trackEntriesEnd;

+  while (i != j) {

+    Track* const pTrack = *i++;

+    delete pTrack;

+  }

+  delete[] m_trackEntries;

+}

+const Track* Tracks::GetTrackByNumber(long tn) const {

+  if (tn < 0)

+    return NULL;

+  Track** i = m_trackEntries;

+  Track** const j = m_trackEntriesEnd;

+  while (i != j) {

+    Track* const pTrack = *i++;

+    if (pTrack == NULL)

+      continue;

+    if (tn == pTrack->GetNumber())

+      return pTrack;

+  }

+  return NULL;  // not found

+}

+const Track* Tracks::GetTrackByIndex(unsigned long idx) const {

+  const ptrdiff_t count = m_trackEntriesEnd - m_trackEntries;

+  if (idx >= static_cast<unsigned long>(count))

+    return NULL;

+  return m_trackEntries[idx];

+}

+long Cluster::Load(long long& pos, long& len) const {

+  if (m_pSegment == NULL)

+    return E_PARSE_FAILED;

+  if (m_timecode >= 0)  // at least partially loaded

+    return 0;

+  if (m_pos != m_element_start || m_element_size >= 0)

+    return E_PARSE_FAILED;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long total, avail;

+  const int status = pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  if (total >= 0 && (avail > total || m_pos > total))

+    return E_FILE_FORMAT_INVALID;

+  pos = m_pos;

+  long long cluster_size = -1;

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  long long result = GetUIntLength(pReader, pos, len);

+  if (result < 0)  // error or underflow

+    return static_cast<long>(result);

+  if (result > 0)

+    return E_BUFFER_NOT_FULL;

+  if ((pos + len) > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long id_ = ReadID(pReader, pos, len);

+  if (id_ < 0)  // error

+    return static_cast<long>(id_);

+  if (id_ != libwebm::kMkvCluster)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume id

+  // read cluster size

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  result = GetUIntLength(pReader, pos, len);

+  if (result < 0)  // error

+    return static_cast<long>(result);

+  if (result > 0)

+    return E_BUFFER_NOT_FULL;

+  if ((pos + len) > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long size = ReadUInt(pReader, pos, len);

+  if (size < 0)  // error

+    return static_cast<long>(cluster_size);

+  if (size == 0)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume length of size of element

+  const long long unknown_size = (1LL << (7 * len)) - 1;

+  if (size != unknown_size)

+    cluster_size = size;

+  // pos points to start of payload

+  long long timecode = -1;

+  long long new_pos = -1;

+  bool bBlock = false;

+  long long cluster_stop = (cluster_size < 0) ? -1 : pos + cluster_size;

+  for (;;) {

+    if ((cluster_stop >= 0) && (pos >= cluster_stop))

+      break;

+    // Parse ID

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)  // error

+      return static_cast<long>(id);

+    if (id == 0)

+      return E_FILE_FORMAT_INVALID;

+    // This is the distinguished set of ID's we use to determine

+    // that we have exhausted the sub-element's inside the cluster

+    // whose ID we parsed earlier.

+    if (id == libwebm::kMkvCluster)

+      break;

+    if (id == libwebm::kMkvCues)

+      break;

+    pos += len;  // consume ID field

+    // Parse Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size == unknown_size)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume size field

+    if ((cluster_stop >= 0) && (pos > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    // pos now points to start of payload

+    if (size == 0)

+      continue;

+    if ((cluster_stop >= 0) && ((pos + size) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if (id == libwebm::kMkvTimecode) {

+      len = static_cast<long>(size);

+      if ((pos + size) > avail)

+        return E_BUFFER_NOT_FULL;

+      timecode = UnserializeUInt(pReader, pos, size);

+      if (timecode < 0)  // error (or underflow)

+        return static_cast<long>(timecode);

+      new_pos = pos + size;

+      if (bBlock)

+        break;

+    } else if (id == libwebm::kMkvBlockGroup) {

+      bBlock = true;

+      break;

+    } else if (id == libwebm::kMkvSimpleBlock) {

+      bBlock = true;

+      break;

+    }

+    pos += size;  // consume payload

+    if (cluster_stop >= 0 && pos > cluster_stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (cluster_stop >= 0 && pos > cluster_stop)

+    return E_FILE_FORMAT_INVALID;

+  if (timecode < 0)  // no timecode found

+    return E_FILE_FORMAT_INVALID;

+  if (!bBlock)

+    return E_FILE_FORMAT_INVALID;

+  m_pos = new_pos;  // designates position just beyond timecode payload

+  m_timecode = timecode;  // m_timecode >= 0 means we're partially loaded

+  if (cluster_size >= 0)

+    m_element_size = cluster_stop - m_element_start;

+  return 0;

+}

+long Cluster::Parse(long long& pos, long& len) const {

+  long status = Load(pos, len);

+  if (status < 0)

+    return status;

+  if (m_pos < m_element_start || m_timecode < 0)

+    return E_PARSE_FAILED;

+  const long long cluster_stop =

+      (m_element_size < 0) ? -1 : m_element_start + m_element_size;

+  if ((cluster_stop >= 0) && (m_pos >= cluster_stop))

+    return 1;  // nothing else to do

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long total, avail;

+  status = pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  if (total >= 0 && avail > total)

+    return E_FILE_FORMAT_INVALID;

+  pos = m_pos;

+  for (;;) {

+    if ((cluster_stop >= 0) && (pos >= cluster_stop))

+      break;

+    if ((total >= 0) && (pos >= total)) {

+      if (m_element_size < 0)

+        m_element_size = pos - m_element_start;

+      break;

+    }

+    // Parse ID

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)

+      return E_FILE_FORMAT_INVALID;

+    // This is the distinguished set of ID's we use to determine

+    // that we have exhausted the sub-element's inside the cluster

+    // whose ID we parsed earlier.

+    if ((id == libwebm::kMkvCluster) || (id == libwebm::kMkvCues)) {

+      if (m_element_size < 0)

+        m_element_size = pos - m_element_start;

+      break;

+    }

+    pos += len;  // consume ID field

+    // Parse Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size == unknown_size)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume size field

+    if ((cluster_stop >= 0) && (pos > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    // pos now points to start of payload

+    if (size == 0)

+      continue;

+    // const long long block_start = pos;

+    const long long block_stop = pos + size;

+    if (cluster_stop >= 0) {

+      if (block_stop > cluster_stop) {

+        if (id == libwebm::kMkvBlockGroup || id == libwebm::kMkvSimpleBlock) {

+          return E_FILE_FORMAT_INVALID;

+        }

+        pos = cluster_stop;

+        break;

+      }

+    } else if ((total >= 0) && (block_stop > total)) {

+      m_element_size = total - m_element_start;

+      pos = total;

+      break;

+    } else if (block_stop > avail) {

+      len = static_cast<long>(size);

+      return E_BUFFER_NOT_FULL;

+    }

+    Cluster* const this_ = const_cast<Cluster*>(this);

+    if (id == libwebm::kMkvBlockGroup)

+      return this_->ParseBlockGroup(size, pos, len);

+    if (id == libwebm::kMkvSimpleBlock)

+      return this_->ParseSimpleBlock(size, pos, len);

+    pos += size;  // consume payload

+    if (cluster_stop >= 0 && pos > cluster_stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (m_element_size < 1)

+    return E_FILE_FORMAT_INVALID;

+  m_pos = pos;

+  if (cluster_stop >= 0 && m_pos > cluster_stop)

+    return E_FILE_FORMAT_INVALID;

+  if (m_entries_count > 0) {

+    const long idx = m_entries_count - 1;

+    const BlockEntry* const pLast = m_entries[idx];

+    if (pLast == NULL)

+      return E_PARSE_FAILED;

+    const Block* const pBlock = pLast->GetBlock();

+    if (pBlock == NULL)

+      return E_PARSE_FAILED;

+    const long long start = pBlock->m_start;

+    if ((total >= 0) && (start > total))

+      return E_PARSE_FAILED;  // defend against trucated stream

+    const long long size = pBlock->m_size;

+    const long long stop = start + size;

+    if (cluster_stop >= 0 && stop > cluster_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((total >= 0) && (stop > total))

+      return E_PARSE_FAILED;  // defend against trucated stream

+  }

+  return 1;  // no more entries

+}

+long Cluster::ParseSimpleBlock(long long block_size, long long& pos,

+                               long& len) {

+  const long long block_start = pos;

+  const long long block_stop = pos + block_size;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long total, avail;

+  long status = pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  // parse track number

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  long long result = GetUIntLength(pReader, pos, len);

+  if (result < 0)  // error

+    return static_cast<long>(result);

+  if (result > 0)  // weird

+    return E_BUFFER_NOT_FULL;

+  if ((pos + len) > block_stop)

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + len) > avail)

+    return E_BUFFER_NOT_FULL;

+  const long long track = ReadUInt(pReader, pos, len);

+  if (track < 0)  // error

+    return static_cast<long>(track);

+  if (track == 0)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume track number

+  if ((pos + 2) > block_stop)

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + 2) > avail) {

+    len = 2;

+    return E_BUFFER_NOT_FULL;

+  }

+  pos += 2;  // consume timecode

+  if ((pos + 1) > block_stop)

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + 1) > avail) {

+    len = 1;

+    return E_BUFFER_NOT_FULL;

+  }

+  unsigned char flags;

+  status = pReader->Read(pos, 1, &flags);

+  if (status < 0) {  // error or underflow

+    len = 1;

+    return status;

+  }

+  ++pos;  // consume flags byte

+  assert(pos <= avail);

+  if (pos >= block_stop)

+    return E_FILE_FORMAT_INVALID;

+  const int lacing = int(flags & 0x06) >> 1;

+  if ((lacing != 0) && (block_stop > avail)) {

+    len = static_cast<long>(block_stop - pos);

+    return E_BUFFER_NOT_FULL;

+  }

+  status = CreateBlock(libwebm::kMkvSimpleBlock, block_start, block_size,

+                       0);  // DiscardPadding

+  if (status != 0)

+    return status;

+  m_pos = block_stop;

+  return 0;  // success

+}

+long Cluster::ParseBlockGroup(long long payload_size, long long& pos,

+                              long& len) {

+  const long long payload_start = pos;

+  const long long payload_stop = pos + payload_size;

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long total, avail;

+  long status = pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  if ((total >= 0) && (payload_stop > total))

+    return E_FILE_FORMAT_INVALID;

+  if (payload_stop > avail) {

+    len = static_cast<long>(payload_size);

+    return E_BUFFER_NOT_FULL;

+  }

+  long long discard_padding = 0;

+  while (pos < payload_stop) {

+    // parse sub-block element ID

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((pos + len) > payload_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)  // error

+      return static_cast<long>(id);

+    if (id == 0)  // not a valid ID

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume ID field

+    // Parse Size

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((pos + len) > payload_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    pos += len;  // consume size field

+    // pos now points to start of sub-block group payload

+    if (pos > payload_stop)

+      return E_FILE_FORMAT_INVALID;

+    if (size == 0)  // weird

+      continue;

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size == unknown_size)

+      return E_FILE_FORMAT_INVALID;

+    if (id == libwebm::kMkvDiscardPadding) {

+      status = UnserializeInt(pReader, pos, size, discard_padding);

+      if (status < 0)  // error

+        return status;

+    }

+    if (id != libwebm::kMkvBlock) {

+      pos += size;  // consume sub-part of block group

+      if (pos > payload_stop)

+        return E_FILE_FORMAT_INVALID;

+      continue;

+    }

+    const long long block_stop = pos + size;

+    if (block_stop > payload_stop)

+      return E_FILE_FORMAT_INVALID;

+    // parse track number

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((pos + len) > block_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long track = ReadUInt(pReader, pos, len);

+    if (track < 0)  // error

+      return static_cast<long>(track);

+    if (track == 0)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume track number

+    if ((pos + 2) > block_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + 2) > avail) {

+      len = 2;

+      return E_BUFFER_NOT_FULL;

+    }

+    pos += 2;  // consume timecode

+    if ((pos + 1) > block_stop)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    unsigned char flags;

+    status = pReader->Read(pos, 1, &flags);

+    if (status < 0) {  // error or underflow

+      len = 1;

+      return status;

+    }

+    ++pos;  // consume flags byte

+    assert(pos <= avail);

+    if (pos >= block_stop)

+      return E_FILE_FORMAT_INVALID;

+    const int lacing = int(flags & 0x06) >> 1;

+    if ((lacing != 0) && (block_stop > avail)) {

+      len = static_cast<long>(block_stop - pos);

+      return E_BUFFER_NOT_FULL;

+    }

+    pos = block_stop;  // consume block-part of block group

+    if (pos > payload_stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (pos != payload_stop)

+    return E_FILE_FORMAT_INVALID;

+  status = CreateBlock(libwebm::kMkvBlockGroup, payload_start, payload_size,

+                       discard_padding);

+  if (status != 0)

+    return status;

+  m_pos = payload_stop;

+  return 0;  // success

+}

+long Cluster::GetEntry(long index, const mkvparser::BlockEntry*& pEntry) const {

+  assert(m_pos >= m_element_start);

+  pEntry = NULL;

+  if (index < 0)

+    return -1;  // generic error

+  if (m_entries_count < 0)

+    return E_BUFFER_NOT_FULL;

+  assert(m_entries);

+  assert(m_entries_size > 0);

+  assert(m_entries_count <= m_entries_size);

+  if (index < m_entries_count) {

+    pEntry = m_entries[index];

+    assert(pEntry);

+    return 1;  // found entry

+  }

+  if (m_element_size < 0)  // we don't know cluster end yet

+    return E_BUFFER_NOT_FULL;  // underflow

+  const long long element_stop = m_element_start + m_element_size;

+  if (m_pos >= element_stop)

+    return 0;  // nothing left to parse

+  return E_BUFFER_NOT_FULL;  // underflow, since more remains to be parsed

+}

+Cluster* Cluster::Create(Segment* pSegment, long idx, long long off) {

+  if (!pSegment || off < 0)

+    return NULL;

+  const long long element_start = pSegment->m_start + off;

+  Cluster* const pCluster =

+      new (std::nothrow) Cluster(pSegment, idx, element_start);

+  return pCluster;

+}

+Cluster::Cluster()

+    : m_pSegment(NULL),

+      m_element_start(0),

+      m_index(0),

+      m_pos(0),

+      m_element_size(0),

+      m_timecode(0),

+      m_entries(NULL),

+      m_entries_size(0),

+      m_entries_count(0)  // means "no entries"

+{}

+Cluster::Cluster(Segment* pSegment, long idx, long long element_start

+                 /* long long element_size */)

+    : m_pSegment(pSegment),

+      m_element_start(element_start),

+      m_index(idx),

+      m_pos(element_start),

+      m_element_size(-1 /* element_size */),

+      m_timecode(-1),

+      m_entries(NULL),

+      m_entries_size(0),

+      m_entries_count(-1)  // means "has not been parsed yet"

+{}

+Cluster::~Cluster() {

+  if (m_entries_count <= 0)

+    return;

+  BlockEntry** i = m_entries;

+  BlockEntry** const j = m_entries + m_entries_count;

+  while (i != j) {

+    BlockEntry* p = *i++;

+    assert(p);

+    delete p;

+  }

+  delete[] m_entries;

+}

+bool Cluster::EOS() const { return (m_pSegment == NULL); }

+long Cluster::GetIndex() const { return m_index; }

+long long Cluster::GetPosition() const {

+  const long long pos = m_element_start - m_pSegment->m_start;

+  assert(pos >= 0);

+  return pos;

+}

+long long Cluster::GetElementSize() const { return m_element_size; }

+long Cluster::HasBlockEntries(

+    const Segment* pSegment,

+    long long off,  // relative to start of segment payload

+    long long& pos, long& len) {

+  assert(pSegment);

+  assert(off >= 0);  // relative to segment

+  IMkvReader* const pReader = pSegment->m_pReader;

+  long long total, avail;

+  long status = pReader->Length(&total, &avail);

+  if (status < 0)  // error

+    return status;

+  assert((total < 0) || (avail <= total));

+  pos = pSegment->m_start + off;  // absolute

+  if ((total >= 0) && (pos >= total))

+    return 0;  // we don't even have a complete cluster

+  const long long segment_stop =

+      (pSegment->m_size < 0) ? -1 : pSegment->m_start + pSegment->m_size;

+  long long cluster_stop = -1;  // interpreted later to mean "unknown size"

+  {

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // need more data

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((total >= 0) && ((pos + len) > total))

+      return 0;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)  // error

+      return static_cast<long>(id);

+    if (id != libwebm::kMkvCluster)

+      return E_PARSE_FAILED;

+    pos += len;  // consume Cluster ID field

+    // read size field

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // weird

+      return E_BUFFER_NOT_FULL;

+    if ((segment_stop >= 0) && ((pos + len) > segment_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((total >= 0) && ((pos + len) > total))

+      return 0;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    if (size == 0)

+      return 0;  // cluster does not have entries

+    pos += len;  // consume size field

+    // pos now points to start of payload

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size != unknown_size) {

+      cluster_stop = pos + size;

+      assert(cluster_stop >= 0);

+      if ((segment_stop >= 0) && (cluster_stop > segment_stop))

+        return E_FILE_FORMAT_INVALID;

+      if ((total >= 0) && (cluster_stop > total))

+        // return E_FILE_FORMAT_INVALID;  //too conservative

+        return 0;  // cluster does not have any entries

+    }

+  }

+  for (;;) {

+    if ((cluster_stop >= 0) && (pos >= cluster_stop))

+      return 0;  // no entries detected

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    long long result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // need more data

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0)  // error

+      return static_cast<long>(id);

+    // This is the distinguished set of ID's we use to determine

+    // that we have exhausted the sub-element's inside the cluster

+    // whose ID we parsed earlier.

+    if (id == libwebm::kMkvCluster)

+      return 0;  // no entries found

+    if (id == libwebm::kMkvCues)

+      return 0;  // no entries found

+    pos += len;  // consume id field

+    if ((cluster_stop >= 0) && (pos >= cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    // read size field

+    if ((pos + 1) > avail) {

+      len = 1;

+      return E_BUFFER_NOT_FULL;

+    }

+    result = GetUIntLength(pReader, pos, len);

+    if (result < 0)  // error

+      return static_cast<long>(result);

+    if (result > 0)  // underflow

+      return E_BUFFER_NOT_FULL;

+    if ((cluster_stop >= 0) && ((pos + len) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > avail)

+      return E_BUFFER_NOT_FULL;

+    const long long size = ReadUInt(pReader, pos, len);

+    if (size < 0)  // error

+      return static_cast<long>(size);

+    pos += len;  // consume size field

+    // pos now points to start of payload

+    if ((cluster_stop >= 0) && (pos > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if (size == 0)  // weird

+      continue;

+    const long long unknown_size = (1LL << (7 * len)) - 1;

+    if (size == unknown_size)

+      return E_FILE_FORMAT_INVALID;  // not supported inside cluster

+    if ((cluster_stop >= 0) && ((pos + size) > cluster_stop))

+      return E_FILE_FORMAT_INVALID;

+    if (id == libwebm::kMkvBlockGroup)

+      return 1;  // have at least one entry

+    if (id == libwebm::kMkvSimpleBlock)

+      return 1;  // have at least one entry

+    pos += size;  // consume payload

+    if (cluster_stop >= 0 && pos > cluster_stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+}

+long long Cluster::GetTimeCode() const {

+  long long pos;

+  long len;

+  const long status = Load(pos, len);

+  if (status < 0)  // error

+    return status;

+  return m_timecode;

+}

+long long Cluster::GetTime() const {

+  const long long tc = GetTimeCode();

+  if (tc < 0)

+    return tc;

+  const SegmentInfo* const pInfo = m_pSegment->GetInfo();

+  assert(pInfo);

+  const long long scale = pInfo->GetTimeCodeScale();

+  assert(scale >= 1);

+  const long long t = m_timecode * scale;

+  return t;

+}

+long long Cluster::GetFirstTime() const {

+  const BlockEntry* pEntry;

+  const long status = GetFirst(pEntry);

+  if (status < 0)  // error

+    return status;

+  if (pEntry == NULL)  // empty cluster

+    return GetTime();

+  const Block* const pBlock = pEntry->GetBlock();

+  assert(pBlock);

+  return pBlock->GetTime(this);

+}

+long long Cluster::GetLastTime() const {

+  const BlockEntry* pEntry;

+  const long status = GetLast(pEntry);

+  if (status < 0)  // error

+    return status;

+  if (pEntry == NULL)  // empty cluster

+    return GetTime();

+  const Block* const pBlock = pEntry->GetBlock();

+  assert(pBlock);

+  return pBlock->GetTime(this);

+}

+long Cluster::CreateBlock(long long id,

+                          long long pos,  // absolute pos of payload

+                          long long size, long long discard_padding) {

+  if (id != libwebm::kMkvBlockGroup && id != libwebm::kMkvSimpleBlock)

+    return E_PARSE_FAILED;

+  if (m_entries_count < 0) {  // haven't parsed anything yet

+    assert(m_entries == NULL);

+    assert(m_entries_size == 0);

+    m_entries_size = 1024;

+    m_entries = new (std::nothrow) BlockEntry*[m_entries_size];

+    if (m_entries == NULL)

+      return -1;

+    m_entries_count = 0;

+  } else {

+    assert(m_entries);

+    assert(m_entries_size > 0);

+    assert(m_entries_count <= m_entries_size);

+    if (m_entries_count >= m_entries_size) {

+      const long entries_size = 2 * m_entries_size;

+      BlockEntry** const entries = new (std::nothrow) BlockEntry*[entries_size];

+      if (entries == NULL)

+        return -1;

+      BlockEntry** src = m_entries;

+      BlockEntry** const src_end = src + m_entries_count;

+      BlockEntry** dst = entries;

+      while (src != src_end)

+        *dst++ = *src++;

+      delete[] m_entries;

+      m_entries = entries;

+      m_entries_size = entries_size;

+    }

+  }

+  if (id == libwebm::kMkvBlockGroup)

+    return CreateBlockGroup(pos, size, discard_padding);

+  else

+    return CreateSimpleBlock(pos, size);

+}

+long Cluster::CreateBlockGroup(long long start_offset, long long size,

+                               long long discard_padding) {

+  assert(m_entries);

+  assert(m_entries_size > 0);

+  assert(m_entries_count >= 0);

+  assert(m_entries_count < m_entries_size);

+  IMkvReader* const pReader = m_pSegment->m_pReader;

+  long long pos = start_offset;

+  const long long stop = start_offset + size;

+  // For WebM files, there is a bias towards previous reference times

+  //(in order to support alt-ref frames, which refer back to the previous

+  // keyframe).  Normally a 0 value is not possible, but here we tenatively

+  // allow 0 as the value of a reference frame, with the interpretation

+  // that this is a "previous" reference time.

+  long long prev = 1;  // nonce

+  long long next = 0;  // nonce

+  long long duration = -1;  // really, this is unsigned

+  long long bpos = -1;

+  long long bsize = -1;

+  while (pos < stop) {

+    long len;

+    const long long id = ReadID(pReader, pos, len);

+    if (id < 0 || (pos + len) > stop)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume ID

+    const long long size = ReadUInt(pReader, pos, len);

+    assert(size >= 0);  // TODO

+    assert((pos + len) <= stop);

+    pos += len;  // consume size

+    if (id == libwebm::kMkvBlock) {

+      if (bpos < 0) {  // Block ID

+        bpos = pos;

+        bsize = size;

+      }

+    } else if (id == libwebm::kMkvBlockDuration) {

+      if (size > 8)

+        return E_FILE_FORMAT_INVALID;

+      duration = UnserializeUInt(pReader, pos, size);

+      if (duration < 0)

+        return E_FILE_FORMAT_INVALID;

+    } else if (id == libwebm::kMkvReferenceBlock) {

+      if (size > 8 || size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      const long size_ = static_cast<long>(size);

+      long long time;

+      long status = UnserializeInt(pReader, pos, size_, time);

+      assert(status == 0);

+      if (status != 0)

+        return -1;

+      if (time <= 0)  // see note above

+        prev = time;

+      else

+        next = time;

+    }

+    pos += size;  // consume payload

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  if (bpos < 0)

+    return E_FILE_FORMAT_INVALID;

+  if (pos != stop)

+    return E_FILE_FORMAT_INVALID;

+  assert(bsize >= 0);

+  const long idx = m_entries_count;

+  BlockEntry** const ppEntry = m_entries + idx;

+  BlockEntry*& pEntry = *ppEntry;

+  pEntry = new (std::nothrow)

+      BlockGroup(this, idx, bpos, bsize, prev, next, duration, discard_padding);

+  if (pEntry == NULL)

+    return -1;  // generic error

+  BlockGroup* const p = static_cast<BlockGroup*>(pEntry);

+  const long status = p->Parse();

+  if (status == 0) {  // success

+    ++m_entries_count;

+    return 0;

+  }

+  delete pEntry;

+  pEntry = 0;

+  return status;

+}

+long Cluster::CreateSimpleBlock(long long st, long long sz) {

+  assert(m_entries);

+  assert(m_entries_size > 0);

+  assert(m_entries_count >= 0);

+  assert(m_entries_count < m_entries_size);

+  const long idx = m_entries_count;

+  BlockEntry** const ppEntry = m_entries + idx;

+  BlockEntry*& pEntry = *ppEntry;

+  pEntry = new (std::nothrow) SimpleBlock(this, idx, st, sz);

+  if (pEntry == NULL)

+    return -1;  // generic error

+  SimpleBlock* const p = static_cast<SimpleBlock*>(pEntry);

+  const long status = p->Parse();

+  if (status == 0) {

+    ++m_entries_count;

+    return 0;

+  }

+  delete pEntry;

+  pEntry = 0;

+  return status;

+}

+long Cluster::GetFirst(const BlockEntry*& pFirst) const {

+  if (m_entries_count <= 0) {

+    long long pos;

+    long len;

+    const long status = Parse(pos, len);

+    if (status < 0) {  // error

+      pFirst = NULL;

+      return status;

+    }

+    if (m_entries_count <= 0) {  // empty cluster

+      pFirst = NULL;

+      return 0;

+    }

+  }

+  assert(m_entries);

+  pFirst = m_entries[0];

+  assert(pFirst);

+  return 0;  // success

+}

+long Cluster::GetLast(const BlockEntry*& pLast) const {

+  for (;;) {

+    long long pos;

+    long len;

+    const long status = Parse(pos, len);

+    if (status < 0) {  // error

+      pLast = NULL;

+      return status;

+    }

+    if (status > 0)  // no new block

+      break;

+  }

+  if (m_entries_count <= 0) {

+    pLast = NULL;

+    return 0;

+  }

+  assert(m_entries);

+  const long idx = m_entries_count - 1;

+  pLast = m_entries[idx];

+  assert(pLast);

+  return 0;

+}

+long Cluster::GetNext(const BlockEntry* pCurr, const BlockEntry*& pNext) const {

+  assert(pCurr);

+  assert(m_entries);

+  assert(m_entries_count > 0);

+  size_t idx = pCurr->GetIndex();

+  assert(idx < size_t(m_entries_count));

+  assert(m_entries[idx] == pCurr);

+  ++idx;

+  if (idx >= size_t(m_entries_count)) {

+    long long pos;

+    long len;

+    const long status = Parse(pos, len);

+    if (status < 0) {  // error

+      pNext = NULL;

+      return status;

+    }

+    if (status > 0) {

+      pNext = NULL;

+      return 0;

+    }

+    assert(m_entries);

+    assert(m_entries_count > 0);

+    assert(idx < size_t(m_entries_count));

+  }

+  pNext = m_entries[idx];

+  assert(pNext);

+  return 0;

+}

+long Cluster::GetEntryCount() const { return m_entries_count; }

+const BlockEntry* Cluster::GetEntry(const Track* pTrack,

+                                    long long time_ns) const {

+  assert(pTrack);

+  if (m_pSegment == NULL)  // this is the special EOS cluster

+    return pTrack->GetEOS();

+  const BlockEntry* pResult = pTrack->GetEOS();

+  long index = 0;

+  for (;;) {

+    if (index >= m_entries_count) {

+      long long pos;

+      long len;

+      const long status = Parse(pos, len);

+      assert(status >= 0);

+      if (status > 0)  // completely parsed, and no more entries

+        return pResult;

+      if (status < 0)  // should never happen

+        return 0;

+      assert(m_entries);

+      assert(index < m_entries_count);

+    }

+    const BlockEntry* const pEntry = m_entries[index];

+    assert(pEntry);

+    assert(!pEntry->EOS());

+    const Block* const pBlock = pEntry->GetBlock();

+    assert(pBlock);

+    if (pBlock->GetTrackNumber() != pTrack->GetNumber()) {

+      ++index;

+      continue;

+    }

+    if (pTrack->VetEntry(pEntry)) {

+      if (time_ns < 0)  // just want first candidate block

+        return pEntry;

+      const long long ns = pBlock->GetTime(this);

+      if (ns > time_ns)

+        return pResult;

+      pResult = pEntry;  // have a candidate

+    } else if (time_ns >= 0) {

+      const long long ns = pBlock->GetTime(this);

+      if (ns > time_ns)

+        return pResult;

+    }

+    ++index;

+  }

+}

+const BlockEntry* Cluster::GetEntry(const CuePoint& cp,

+                                    const CuePoint::TrackPosition& tp) const {

+  assert(m_pSegment);

+  const long long tc = cp.GetTimeCode();

+  if (tp.m_block > 0) {

+    const long block = static_cast<long>(tp.m_block);

+    const long index = block - 1;

+    while (index >= m_entries_count) {

+      long long pos;

+      long len;

+      const long status = Parse(pos, len);

+      if (status < 0)  // TODO: can this happen?

+        return NULL;

+      if (status > 0)  // nothing remains to be parsed

+        return NULL;

+    }

+    const BlockEntry* const pEntry = m_entries[index];

+    assert(pEntry);

+    assert(!pEntry->EOS());

+    const Block* const pBlock = pEntry->GetBlock();

+    assert(pBlock);

+    if ((pBlock->GetTrackNumber() == tp.m_track) &&

+        (pBlock->GetTimeCode(this) == tc)) {

+      return pEntry;

+    }

+  }

+  long index = 0;

+  for (;;) {

+    if (index >= m_entries_count) {

+      long long pos;

+      long len;

+      const long status = Parse(pos, len);

+      if (status < 0)  // TODO: can this happen?

+        return NULL;

+      if (status > 0)  // nothing remains to be parsed

+        return NULL;

+      assert(m_entries);

+      assert(index < m_entries_count);

+    }

+    const BlockEntry* const pEntry = m_entries[index];

+    assert(pEntry);

+    assert(!pEntry->EOS());

+    const Block* const pBlock = pEntry->GetBlock();

+    assert(pBlock);

+    if (pBlock->GetTrackNumber() != tp.m_track) {

+      ++index;

+      continue;

+    }

+    const long long tc_ = pBlock->GetTimeCode(this);

+    if (tc_ < tc) {

+      ++index;

+      continue;

+    }

+    if (tc_ > tc)

+      return NULL;

+    const Tracks* const pTracks = m_pSegment->GetTracks();

+    assert(pTracks);

+    const long tn = static_cast<long>(tp.m_track);

+    const Track* const pTrack = pTracks->GetTrackByNumber(tn);

+    if (pTrack == NULL)

+      return NULL;

+    const long long type = pTrack->GetType();

+    if (type == 2)  // audio

+      return pEntry;

+    if (type != 1)  // not video

+      return NULL;

+    if (!pBlock->IsKey())

+      return NULL;

+    return pEntry;

+  }

+}

+BlockEntry::BlockEntry(Cluster* p, long idx) : m_pCluster(p), m_index(idx) {}

+BlockEntry::~BlockEntry() {}

+const Cluster* BlockEntry::GetCluster() const { return m_pCluster; }

+long BlockEntry::GetIndex() const { return m_index; }

+SimpleBlock::SimpleBlock(Cluster* pCluster, long idx, long long start,

+                         long long size)

+    : BlockEntry(pCluster, idx), m_block(start, size, 0) {}

+long SimpleBlock::Parse() { return m_block.Parse(m_pCluster); }

+BlockEntry::Kind SimpleBlock::GetKind() const { return kBlockSimple; }

+const Block* SimpleBlock::GetBlock() const { return &m_block; }

+BlockGroup::BlockGroup(Cluster* pCluster, long idx, long long block_start,

+                       long long block_size, long long prev, long long next,

+                       long long duration, long long discard_padding)

+    : BlockEntry(pCluster, idx),

+      m_block(block_start, block_size, discard_padding),

+      m_prev(prev),

+      m_next(next),

+      m_duration(duration) {}

+long BlockGroup::Parse() {

+  const long status = m_block.Parse(m_pCluster);

+  if (status)

+    return status;

+  m_block.SetKey((m_prev > 0) && (m_next <= 0));

+  return 0;

+}

+BlockEntry::Kind BlockGroup::GetKind() const { return kBlockGroup; }

+const Block* BlockGroup::GetBlock() const { return &m_block; }

+long long BlockGroup::GetPrevTimeCode() const { return m_prev; }

+long long BlockGroup::GetNextTimeCode() const { return m_next; }

+long long BlockGroup::GetDurationTimeCode() const { return m_duration; }

+Block::Block(long long start, long long size_, long long discard_padding)

+    : m_start(start),

+      m_size(size_),

+      m_track(0),

+      m_timecode(-1),

+      m_flags(0),

+      m_frames(NULL),

+      m_frame_count(-1),

+      m_discard_padding(discard_padding) {}

+Block::~Block() { delete[] m_frames; }

+long Block::Parse(const Cluster* pCluster) {

+  if (pCluster == NULL)

+    return -1;

+  if (pCluster->m_pSegment == NULL)

+    return -1;

+  assert(m_start >= 0);

+  assert(m_size >= 0);

+  assert(m_track <= 0);

+  assert(m_frames == NULL);

+  assert(m_frame_count <= 0);

+  long long pos = m_start;

+  const long long stop = m_start + m_size;

+  long len;

+  IMkvReader* const pReader = pCluster->m_pSegment->m_pReader;

+  m_track = ReadUInt(pReader, pos, len);

+  if (m_track <= 0)

+    return E_FILE_FORMAT_INVALID;

+  if ((pos + len) > stop)

+    return E_FILE_FORMAT_INVALID;

+  pos += len;  // consume track number

+  if ((stop - pos) < 2)

+    return E_FILE_FORMAT_INVALID;

+  long status;

+  long long value;

+  status = UnserializeInt(pReader, pos, 2, value);

+  if (status)

+    return E_FILE_FORMAT_INVALID;

+  if (value < SHRT_MIN)

+    return E_FILE_FORMAT_INVALID;

+  if (value > SHRT_MAX)

+    return E_FILE_FORMAT_INVALID;

+  m_timecode = static_cast<short>(value);

+  pos += 2;

+  if ((stop - pos) <= 0)

+    return E_FILE_FORMAT_INVALID;

+  status = pReader->Read(pos, 1, &m_flags);

+  if (status)

+    return E_FILE_FORMAT_INVALID;

+  const int lacing = int(m_flags & 0x06) >> 1;

+  ++pos;  // consume flags byte

+  if (lacing == 0) {  // no lacing

+    if (pos > stop)

+      return E_FILE_FORMAT_INVALID;

+    m_frame_count = 1;

+    m_frames = new (std::nothrow) Frame[m_frame_count];

+    if (m_frames == NULL)

+      return -1;

+    Frame& f = m_frames[0];

+    f.pos = pos;

+    const long long frame_size = stop - pos;

+    if (frame_size > LONG_MAX || frame_size <= 0)

+      return E_FILE_FORMAT_INVALID;

+    f.len = static_cast<long>(frame_size);

+    return 0;  // success

+  }

+  if (pos >= stop)

+    return E_FILE_FORMAT_INVALID;

+  unsigned char biased_count;

+  status = pReader->Read(pos, 1, &biased_count);

+  if (status)

+    return E_FILE_FORMAT_INVALID;

+  ++pos;  // consume frame count

+  if (pos > stop)

+    return E_FILE_FORMAT_INVALID;

+  m_frame_count = int(biased_count) + 1;

+  m_frames = new (std::nothrow) Frame[m_frame_count];

+  if (m_frames == NULL)

+    return -1;

+  if (!m_frames)

+    return E_FILE_FORMAT_INVALID;

+  if (lacing == 1) {  // Xiph

+    Frame* pf = m_frames;

+    Frame* const pf_end = pf + m_frame_count;

+    long long size = 0;

+    int frame_count = m_frame_count;

+    while (frame_count > 1) {

+      long frame_size = 0;

+      for (;;) {

+        unsigned char val;

+        if (pos >= stop)

+          return E_FILE_FORMAT_INVALID;

+        status = pReader->Read(pos, 1, &val);

+        if (status)

+          return E_FILE_FORMAT_INVALID;

+        ++pos;  // consume xiph size byte

+        frame_size += val;

+        if (val < 255)

+          break;

+      }

+      Frame& f = *pf++;

+      assert(pf < pf_end);

+      if (pf >= pf_end)

+        return E_FILE_FORMAT_INVALID;

+      f.pos = 0;  // patch later

+      if (frame_size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      f.len = frame_size;

+      size += frame_size;  // contribution of this frame

+      --frame_count;

+    }

+    if (pf >= pf_end || pos > stop)

+      return E_FILE_FORMAT_INVALID;

+    {

+      Frame& f = *pf++;

+      if (pf != pf_end)

+        return E_FILE_FORMAT_INVALID;

+      f.pos = 0;  // patch later

+      const long long total_size = stop - pos;

+      if (total_size < size)

+        return E_FILE_FORMAT_INVALID;

+      const long long frame_size = total_size - size;

+      if (frame_size > LONG_MAX || frame_size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      f.len = static_cast<long>(frame_size);

+    }

+    pf = m_frames;

+    while (pf != pf_end) {

+      Frame& f = *pf++;

+      assert((pos + f.len) <= stop);

+      if ((pos + f.len) > stop)

+        return E_FILE_FORMAT_INVALID;

+      f.pos = pos;

+      pos += f.len;

+    }

+    assert(pos == stop);

+    if (pos != stop)

+      return E_FILE_FORMAT_INVALID;

+  } else if (lacing == 2) {  // fixed-size lacing

+    if (pos >= stop)

+      return E_FILE_FORMAT_INVALID;

+    const long long total_size = stop - pos;

+    if ((total_size % m_frame_count) != 0)

+      return E_FILE_FORMAT_INVALID;

+    const long long frame_size = total_size / m_frame_count;

+    if (frame_size > LONG_MAX || frame_size <= 0)

+      return E_FILE_FORMAT_INVALID;

+    Frame* pf = m_frames;

+    Frame* const pf_end = pf + m_frame_count;

+    while (pf != pf_end) {

+      assert((pos + frame_size) <= stop);

+      if ((pos + frame_size) > stop)

+        return E_FILE_FORMAT_INVALID;

+      Frame& f = *pf++;

+      f.pos = pos;

+      f.len = static_cast<long>(frame_size);

+      pos += frame_size;

+    }

+    assert(pos == stop);

+    if (pos != stop)

+      return E_FILE_FORMAT_INVALID;

+  } else {

+    assert(lacing == 3);  // EBML lacing

+    if (pos >= stop)

+      return E_FILE_FORMAT_INVALID;

+    long long size = 0;

+    int frame_count = m_frame_count;

+    long long frame_size = ReadUInt(pReader, pos, len);

+    if (frame_size <= 0)

+      return E_FILE_FORMAT_INVALID;

+    if (frame_size > LONG_MAX)

+      return E_FILE_FORMAT_INVALID;

+    if ((pos + len) > stop)

+      return E_FILE_FORMAT_INVALID;

+    pos += len;  // consume length of size of first frame

+    if ((pos + frame_size) > stop)

+      return E_FILE_FORMAT_INVALID;

+    Frame* pf = m_frames;

+    Frame* const pf_end = pf + m_frame_count;

+    {

+      Frame& curr = *pf;

+      curr.pos = 0;  // patch later

+      curr.len = static_cast<long>(frame_size);

+      size += curr.len;  // contribution of this frame

+    }

+    --frame_count;

+    while (frame_count > 1) {

+      if (pos >= stop)

+        return E_FILE_FORMAT_INVALID;

+      assert(pf < pf_end);

+      if (pf >= pf_end)

+        return E_FILE_FORMAT_INVALID;

+      const Frame& prev = *pf++;

+      assert(prev.len == frame_size);

+      if (prev.len != frame_size)

+        return E_FILE_FORMAT_INVALID;

+      assert(pf < pf_end);

+      if (pf >= pf_end)

+        return E_FILE_FORMAT_INVALID;

+      Frame& curr = *pf;

+      curr.pos = 0;  // patch later

+      const long long delta_size_ = ReadUInt(pReader, pos, len);

+      if (delta_size_ < 0)

+        return E_FILE_FORMAT_INVALID;

+      if ((pos + len) > stop)

+        return E_FILE_FORMAT_INVALID;

+      pos += len;  // consume length of (delta) size

+      if (pos > stop)

+        return E_FILE_FORMAT_INVALID;

+      const int exp = 7 * len - 1;

+      const long long bias = (1LL << exp) - 1LL;

+      const long long delta_size = delta_size_ - bias;

+      frame_size += delta_size;

+      if (frame_size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      if (frame_size > LONG_MAX)

+        return E_FILE_FORMAT_INVALID;

+      curr.len = static_cast<long>(frame_size);

+      size += curr.len;  // contribution of this frame

+      --frame_count;

+    }

+    // parse last frame

+    if (frame_count > 0) {

+      if (pos > stop || pf >= pf_end)

+        return E_FILE_FORMAT_INVALID;

+      const Frame& prev = *pf++;

+      assert(prev.len == frame_size);

+      if (prev.len != frame_size)

+        return E_FILE_FORMAT_INVALID;

+      if (pf >= pf_end)

+        return E_FILE_FORMAT_INVALID;

+      Frame& curr = *pf++;

+      if (pf != pf_end)

+        return E_FILE_FORMAT_INVALID;

+      curr.pos = 0;  // patch later

+      const long long total_size = stop - pos;

+      if (total_size < size)

+        return E_FILE_FORMAT_INVALID;

+      frame_size = total_size - size;

+      if (frame_size > LONG_MAX || frame_size <= 0)

+        return E_FILE_FORMAT_INVALID;

+      curr.len = static_cast<long>(frame_size);

+    }

+    pf = m_frames;

+    while (pf != pf_end) {

+      Frame& f = *pf++;

+      assert((pos + f.len) <= stop);

+      if ((pos + f.len) > stop)

+        return E_FILE_FORMAT_INVALID;

+      f.pos = pos;

+      pos += f.len;

+    }

+    if (pos != stop)

+      return E_FILE_FORMAT_INVALID;

+  }

+  return 0;  // success

+}

+long long Block::GetTimeCode(const Cluster* pCluster) const {

+  if (pCluster == 0)

+    return m_timecode;

+  const long long tc0 = pCluster->GetTimeCode();

+  assert(tc0 >= 0);

+  const long long tc = tc0 + m_timecode;

+  return tc;  // unscaled timecode units

+}

+long long Block::GetTime(const Cluster* pCluster) const {

+  assert(pCluster);

+  const long long tc = GetTimeCode(pCluster);

+  const Segment* const pSegment = pCluster->m_pSegment;

+  const SegmentInfo* const pInfo = pSegment->GetInfo();

+  assert(pInfo);

+  const long long scale = pInfo->GetTimeCodeScale();

+  assert(scale >= 1);

+  const long long ns = tc * scale;

+  return ns;

+}

+long long Block::GetTrackNumber() const { return m_track; }

+bool Block::IsKey() const {

+  return ((m_flags & static_cast<unsigned char>(1 << 7)) != 0);

+}

+void Block::SetKey(bool bKey) {

+  if (bKey)

+    m_flags |= static_cast<unsigned char>(1 << 7);

+  else

+    m_flags &= 0x7F;

+}

+bool Block::IsInvisible() const { return bool(int(m_flags & 0x08) != 0); }

+Block::Lacing Block::GetLacing() const {

+  const int value = int(m_flags & 0x06) >> 1;

+  return static_cast<Lacing>(value);

+}

+int Block::GetFrameCount() const { return m_frame_count; }

+const Block::Frame& Block::GetFrame(int idx) const {

+  assert(idx >= 0);

+  assert(idx < m_frame_count);

+  const Frame& f = m_frames[idx];

+  assert(f.pos > 0);

+  assert(f.len > 0);

+  return f;

+}

+long Block::Frame::Read(IMkvReader* pReader, unsigned char* buf) const {

+  assert(pReader);

+  assert(buf);

+  const long status = pReader->Read(pos, len, buf);

+  return status;

+}

+long long Block::GetDiscardPadding() const { return m_discard_padding; }

+}  // namespace mkvparser

--- /dev/null

+++ b/third_party/libwebm/mkvparser/mkvparser.h

@@ -1,0 +1,1112 @@

+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVPARSER_MKVPARSER_H_

+#define MKVPARSER_MKVPARSER_H_

+#include <cstddef>

+namespace mkvparser {

+const int E_PARSE_FAILED = -1;

+const int E_FILE_FORMAT_INVALID = -2;

+const int E_BUFFER_NOT_FULL = -3;

+class IMkvReader {

+ public:

+  virtual int Read(long long pos, long len, unsigned char* buf) = 0;

+  virtual int Length(long long* total, long long* available) = 0;

+ protected:

+  virtual ~IMkvReader();

+};

+template <typename Type>

+Type* SafeArrayAlloc(unsigned long long num_elements,

+                     unsigned long long element_size);

+long long GetUIntLength(IMkvReader*, long long, long&);

+long long ReadUInt(IMkvReader*, long long, long&);

+long long ReadID(IMkvReader* pReader, long long pos, long& len);

+long long UnserializeUInt(IMkvReader*, long long pos, long long size);

+long UnserializeFloat(IMkvReader*, long long pos, long long size, double&);

+long UnserializeInt(IMkvReader*, long long pos, long long size,

+                    long long& result);

+long UnserializeString(IMkvReader*, long long pos, long long size, char*& str);

+long ParseElementHeader(IMkvReader* pReader,

+                        long long& pos,  // consume id and size fields

+                        long long stop,  // if you know size of element's parent

+                        long long& id, long long& size);

+bool Match(IMkvReader*, long long&, unsigned long, long long&);

+bool Match(IMkvReader*, long long&, unsigned long, unsigned char*&, size_t&);

+void GetVersion(int& major, int& minor, int& build, int& revision);

+struct EBMLHeader {

+  EBMLHeader();

+  ~EBMLHeader();

+  long long m_version;

+  long long m_readVersion;

+  long long m_maxIdLength;

+  long long m_maxSizeLength;

+  char* m_docType;

+  long long m_docTypeVersion;

+  long long m_docTypeReadVersion;

+  long long Parse(IMkvReader*, long long&);

+  void Init();

+};

+class Segment;

+class Track;

+class Cluster;

+class Block {

+  Block(const Block&);

+  Block& operator=(const Block&);

+ public:

+  const long long m_start;

+  const long long m_size;

+  Block(long long start, long long size, long long discard_padding);

+  ~Block();

+  long Parse(const Cluster*);

+  long long GetTrackNumber() const;

+  long long GetTimeCode(const Cluster*) const;  // absolute, but not scaled

+  long long GetTime(const Cluster*) const;  // absolute, and scaled (ns)

+  bool IsKey() const;

+  void SetKey(bool);

+  bool IsInvisible() const;

+  enum Lacing { kLacingNone, kLacingXiph, kLacingFixed, kLacingEbml };

+  Lacing GetLacing() const;

+  int GetFrameCount() const;  // to index frames: [0, count)

+  struct Frame {

+    long long pos;  // absolute offset

+    long len;

+    long Read(IMkvReader*, unsigned char*) const;

+  };

+  const Frame& GetFrame(int frame_index) const;

+  long long GetDiscardPadding() const;

+ private:

+  long long m_track;  // Track::Number()

+  short m_timecode;  // relative to cluster

+  unsigned char m_flags;

+  Frame* m_frames;

+  int m_frame_count;

+ protected:

+  const long long m_discard_padding;

+};

+class BlockEntry {

+  BlockEntry(const BlockEntry&);

+  BlockEntry& operator=(const BlockEntry&);

+ protected:

+  BlockEntry(Cluster*, long index);

+ public:

+  virtual ~BlockEntry();

+  bool EOS() const { return (GetKind() == kBlockEOS); }

+  const Cluster* GetCluster() const;

+  long GetIndex() const;

+  virtual const Block* GetBlock() const = 0;

+  enum Kind { kBlockEOS, kBlockSimple, kBlockGroup };

+  virtual Kind GetKind() const = 0;

+ protected:

+  Cluster* const m_pCluster;

+  const long m_index;

+};

+class SimpleBlock : public BlockEntry {

+  SimpleBlock(const SimpleBlock&);

+  SimpleBlock& operator=(const SimpleBlock&);

+ public:

+  SimpleBlock(Cluster*, long index, long long start, long long size);

+  long Parse();

+  Kind GetKind() const;

+  const Block* GetBlock() const;

+ protected:

+  Block m_block;

+};

+class BlockGroup : public BlockEntry {

+  BlockGroup(const BlockGroup&);

+  BlockGroup& operator=(const BlockGroup&);

+ public:

+  BlockGroup(Cluster*, long index,

+             long long block_start,  // absolute pos of block's payload

+             long long block_size,  // size of block's payload

+             long long prev, long long next, long long duration,

+             long long discard_padding);

+  long Parse();

+  Kind GetKind() const;

+  const Block* GetBlock() const;

+  long long GetPrevTimeCode() const;  // relative to block's time

+  long long GetNextTimeCode() const;  // as above

+  long long GetDurationTimeCode() const;

+ private:

+  Block m_block;

+  const long long m_prev;

+  const long long m_next;

+  const long long m_duration;

+};

+///////////////////////////////////////////////////////////////

+// ContentEncoding element

+// Elements used to describe if the track data has been encrypted or

+// compressed with zlib or header stripping.

+class ContentEncoding {

+ public:

+  enum { kCTR = 1 };

+  ContentEncoding();

+  ~ContentEncoding();

+  // ContentCompression element names

+  struct ContentCompression {

+    ContentCompression();

+    ~ContentCompression();

+    unsigned long long algo;

+    unsigned char* settings;

+    long long settings_len;

+  };

+  // ContentEncAESSettings element names

+  struct ContentEncAESSettings {

+    ContentEncAESSettings() : cipher_mode(kCTR) {}

+    ~ContentEncAESSettings() {}

+    unsigned long long cipher_mode;

+  };

+  // ContentEncryption element names

+  struct ContentEncryption {

+    ContentEncryption();

+    ~ContentEncryption();

+    unsigned long long algo;

+    unsigned char* key_id;

+    long long key_id_len;

+    unsigned char* signature;

+    long long signature_len;

+    unsigned char* sig_key_id;

+    long long sig_key_id_len;

+    unsigned long long sig_algo;

+    unsigned long long sig_hash_algo;

+    ContentEncAESSettings aes_settings;

+  };

+  // Returns ContentCompression represented by |idx|. Returns NULL if |idx|

+  // is out of bounds.

+  const ContentCompression* GetCompressionByIndex(unsigned long idx) const;

+  // Returns number of ContentCompression elements in this ContentEncoding

+  // element.

+  unsigned long GetCompressionCount() const;

+  // Parses the ContentCompression element from |pReader|. |start| is the

+  // starting offset of the ContentCompression payload. |size| is the size in

+  // bytes of the ContentCompression payload. |compression| is where the parsed

+  // values will be stored.

+  long ParseCompressionEntry(long long start, long long size,

+                             IMkvReader* pReader,

+                             ContentCompression* compression);

+  // Returns ContentEncryption represented by |idx|. Returns NULL if |idx|

+  // is out of bounds.

+  const ContentEncryption* GetEncryptionByIndex(unsigned long idx) const;

+  // Returns number of ContentEncryption elements in this ContentEncoding

+  // element.

+  unsigned long GetEncryptionCount() const;

+  // Parses the ContentEncAESSettings element from |pReader|. |start| is the

+  // starting offset of the ContentEncAESSettings payload. |size| is the

+  // size in bytes of the ContentEncAESSettings payload. |encryption| is

+  // where the parsed values will be stored.

+  long ParseContentEncAESSettingsEntry(long long start, long long size,

+                                       IMkvReader* pReader,

+                                       ContentEncAESSettings* aes);

+  // Parses the ContentEncoding element from |pReader|. |start| is the

+  // starting offset of the ContentEncoding payload. |size| is the size in

+  // bytes of the ContentEncoding payload. Returns true on success.

+  long ParseContentEncodingEntry(long long start, long long size,

+                                 IMkvReader* pReader);

+  // Parses the ContentEncryption element from |pReader|. |start| is the

+  // starting offset of the ContentEncryption payload. |size| is the size in

+  // bytes of the ContentEncryption payload. |encryption| is where the parsed

+  // values will be stored.

+  long ParseEncryptionEntry(long long start, long long size,

+                            IMkvReader* pReader, ContentEncryption* encryption);

+  unsigned long long encoding_order() const { return encoding_order_; }

+  unsigned long long encoding_scope() const { return encoding_scope_; }

+  unsigned long long encoding_type() const { return encoding_type_; }

+ private:

+  // Member variables for list of ContentCompression elements.

+  ContentCompression** compression_entries_;

+  ContentCompression** compression_entries_end_;

+  // Member variables for list of ContentEncryption elements.

+  ContentEncryption** encryption_entries_;

+  ContentEncryption** encryption_entries_end_;

+  // ContentEncoding element names

+  unsigned long long encoding_order_;

+  unsigned long long encoding_scope_;

+  unsigned long long encoding_type_;

+  // LIBWEBM_DISALLOW_COPY_AND_ASSIGN(ContentEncoding);

+  ContentEncoding(const ContentEncoding&);

+  ContentEncoding& operator=(const ContentEncoding&);

+};

+class Track {

+  Track(const Track&);

+  Track& operator=(const Track&);

+ public:

+  class Info;

+  static long Create(Segment*, const Info&, long long element_start,

+                     long long element_size, Track*&);

+  enum Type { kVideo = 1, kAudio = 2, kSubtitle = 0x11, kMetadata = 0x21 };

+  Segment* const m_pSegment;

+  const long long m_element_start;

+  const long long m_element_size;

+  virtual ~Track();

+  long GetType() const;

+  long GetNumber() const;

+  unsigned long long GetUid() const;

+  const char* GetNameAsUTF8() const;

+  const char* GetLanguage() const;

+  const char* GetCodecNameAsUTF8() const;

+  const char* GetCodecId() const;

+  const unsigned char* GetCodecPrivate(size_t&) const;

+  bool GetLacing() const;

+  unsigned long long GetDefaultDuration() const;

+  unsigned long long GetCodecDelay() const;

+  unsigned long long GetSeekPreRoll() const;

+  const BlockEntry* GetEOS() const;

+  struct Settings {

+    long long start;

+    long long size;

+  };

+  class Info {

+   public:

+    Info();

+    ~Info();

+    int Copy(Info&) const;

+    void Clear();

+    long type;

+    long number;

+    unsigned long long uid;

+    unsigned long long defaultDuration;

+    unsigned long long codecDelay;

+    unsigned long long seekPreRoll;

+    char* nameAsUTF8;

+    char* language;

+    char* codecId;

+    char* codecNameAsUTF8;

+    unsigned char* codecPrivate;

+    size_t codecPrivateSize;

+    bool lacing;

+    Settings settings;

+   private:

+    Info(const Info&);

+    Info& operator=(const Info&);

+    int CopyStr(char* Info::*str, Info&) const;

+  };

+  long GetFirst(const BlockEntry*&) const;

+  long GetNext(const BlockEntry* pCurr, const BlockEntry*& pNext) const;

+  virtual bool VetEntry(const BlockEntry*) const;

+  virtual long Seek(long long time_ns, const BlockEntry*&) const;

+  const ContentEncoding* GetContentEncodingByIndex(unsigned long idx) const;

+  unsigned long GetContentEncodingCount() const;

+  long ParseContentEncodingsEntry(long long start, long long size);

+ protected:

+  Track(Segment*, long long element_start, long long element_size);

+  Info m_info;

+  class EOSBlock : public BlockEntry {

+   public:

+    EOSBlock();

+    Kind GetKind() const;

+    const Block* GetBlock() const;

+  };

+  EOSBlock m_eos;

+ private:

+  ContentEncoding** content_encoding_entries_;

+  ContentEncoding** content_encoding_entries_end_;

+};

+struct PrimaryChromaticity {

+  PrimaryChromaticity() : x(0), y(0) {}

+  ~PrimaryChromaticity() {}

+  static bool Parse(IMkvReader* reader, long long read_pos,

+                    long long value_size, bool is_x,

+                    PrimaryChromaticity** chromaticity);

+  float x;

+  float y;

+};

+struct MasteringMetadata {

+  static const float kValueNotPresent;

+  MasteringMetadata()

+      : r(NULL),

+        g(NULL),

+        b(NULL),

+        white_point(NULL),

+        luminance_max(kValueNotPresent),

+        luminance_min(kValueNotPresent) {}

+  ~MasteringMetadata() {

+    delete r;

+    delete g;

+    delete b;

+    delete white_point;

+  }

+  static bool Parse(IMkvReader* reader, long long element_start,

+                    long long element_size,

+                    MasteringMetadata** mastering_metadata);

+  PrimaryChromaticity* r;

+  PrimaryChromaticity* g;

+  PrimaryChromaticity* b;

+  PrimaryChromaticity* white_point;

+  float luminance_max;

+  float luminance_min;

+};

+struct Colour {

+  static const long long kValueNotPresent;

+  // Unless otherwise noted all values assigned upon construction are the

+  // equivalent of unspecified/default.

+  Colour()

+      : matrix_coefficients(kValueNotPresent),

+        bits_per_channel(kValueNotPresent),

+        chroma_subsampling_horz(kValueNotPresent),

+        chroma_subsampling_vert(kValueNotPresent),

+        cb_subsampling_horz(kValueNotPresent),

+        cb_subsampling_vert(kValueNotPresent),

+        chroma_siting_horz(kValueNotPresent),

+        chroma_siting_vert(kValueNotPresent),

+        range(kValueNotPresent),

+        transfer_characteristics(kValueNotPresent),

+        primaries(kValueNotPresent),

+        max_cll(kValueNotPresent),

+        max_fall(kValueNotPresent),

+        mastering_metadata(NULL) {}

+  ~Colour() {

+    delete mastering_metadata;

+    mastering_metadata = NULL;

+  }

+  static bool Parse(IMkvReader* reader, long long element_start,

+                    long long element_size, Colour** colour);

+  long long matrix_coefficients;

+  long long bits_per_channel;

+  long long chroma_subsampling_horz;

+  long long chroma_subsampling_vert;

+  long long cb_subsampling_horz;

+  long long cb_subsampling_vert;

+  long long chroma_siting_horz;

+  long long chroma_siting_vert;

+  long long range;

+  long long transfer_characteristics;

+  long long primaries;

+  long long max_cll;

+  long long max_fall;

+  MasteringMetadata* mastering_metadata;

+};

+class VideoTrack : public Track {

+  VideoTrack(const VideoTrack&);

+  VideoTrack& operator=(const VideoTrack&);

+  VideoTrack(Segment*, long long element_start, long long element_size);

+ public:

+  virtual ~VideoTrack();

+  static long Parse(Segment*, const Info&, long long element_start,

+                    long long element_size, VideoTrack*&);

+  long long GetWidth() const;

+  long long GetHeight() const;

+  long long GetDisplayWidth() const;

+  long long GetDisplayHeight() const;

+  long long GetDisplayUnit() const;

+  long long GetStereoMode() const;

+  double GetFrameRate() const;

+  bool VetEntry(const BlockEntry*) const;

+  long Seek(long long time_ns, const BlockEntry*&) const;

+  Colour* GetColour() const;

+ private:

+  long long m_width;

+  long long m_height;

+  long long m_display_width;

+  long long m_display_height;

+  long long m_display_unit;

+  long long m_stereo_mode;

+  double m_rate;

+  Colour* m_colour;

+};

+class AudioTrack : public Track {

+  AudioTrack(const AudioTrack&);

+  AudioTrack& operator=(const AudioTrack&);

+  AudioTrack(Segment*, long long element_start, long long element_size);

+ public:

+  static long Parse(Segment*, const Info&, long long element_start,

+                    long long element_size, AudioTrack*&);

+  double GetSamplingRate() const;

+  long long GetChannels() const;

+  long long GetBitDepth() const;

+ private:

+  double m_rate;

+  long long m_channels;

+  long long m_bitDepth;

+};

+class Tracks {

+  Tracks(const Tracks&);

+  Tracks& operator=(const Tracks&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  Tracks(Segment*, long long start, long long size, long long element_start,

+         long long element_size);

+  ~Tracks();

+  long Parse();

+  unsigned long GetTracksCount() const;

+  const Track* GetTrackByNumber(long tn) const;

+  const Track* GetTrackByIndex(unsigned long idx) const;

+ private:

+  Track** m_trackEntries;

+  Track** m_trackEntriesEnd;

+  long ParseTrackEntry(long long payload_start, long long payload_size,

+                       long long element_start, long long element_size,

+                       Track*&) const;

+};

+class Chapters {

+  Chapters(const Chapters&);

+  Chapters& operator=(const Chapters&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  Chapters(Segment*, long long payload_start, long long payload_size,

+           long long element_start, long long element_size);

+  ~Chapters();

+  long Parse();

+  class Atom;

+  class Edition;

+  class Display {

+    friend class Atom;

+    Display();

+    Display(const Display&);

+    ~Display();

+    Display& operator=(const Display&);

+   public:

+    const char* GetString() const;

+    const char* GetLanguage() const;

+    const char* GetCountry() const;

+   private:

+    void Init();

+    void ShallowCopy(Display&) const;

+    void Clear();

+    long Parse(IMkvReader*, long long pos, long long size);

+    char* m_string;

+    char* m_language;

+    char* m_country;

+  };

+  class Atom {

+    friend class Edition;

+    Atom();

+    Atom(const Atom&);

+    ~Atom();

+    Atom& operator=(const Atom&);

+   public:

+    unsigned long long GetUID() const;

+    const char* GetStringUID() const;

+    long long GetStartTimecode() const;

+    long long GetStopTimecode() const;

+    long long GetStartTime(const Chapters*) const;

+    long long GetStopTime(const Chapters*) const;

+    int GetDisplayCount() const;

+    const Display* GetDisplay(int index) const;

+   private:

+    void Init();

+    void ShallowCopy(Atom&) const;

+    void Clear();

+    long Parse(IMkvReader*, long long pos, long long size);

+    static long long GetTime(const Chapters*, long long timecode);

+    long ParseDisplay(IMkvReader*, long long pos, long long size);

+    bool ExpandDisplaysArray();

+    char* m_string_uid;

+    unsigned long long m_uid;

+    long long m_start_timecode;

+    long long m_stop_timecode;

+    Display* m_displays;

+    int m_displays_size;

+    int m_displays_count;

+  };

+  class Edition {

+    friend class Chapters;

+    Edition();

+    Edition(const Edition&);

+    ~Edition();

+    Edition& operator=(const Edition&);

+   public:

+    int GetAtomCount() const;

+    const Atom* GetAtom(int index) const;

+   private:

+    void Init();

+    void ShallowCopy(Edition&) const;

+    void Clear();

+    long Parse(IMkvReader*, long long pos, long long size);

+    long ParseAtom(IMkvReader*, long long pos, long long size);

+    bool ExpandAtomsArray();

+    Atom* m_atoms;

+    int m_atoms_size;

+    int m_atoms_count;

+  };

+  int GetEditionCount() const;

+  const Edition* GetEdition(int index) const;

+ private:

+  long ParseEdition(long long pos, long long size);

+  bool ExpandEditionsArray();

+  Edition* m_editions;

+  int m_editions_size;

+  int m_editions_count;

+};

+class Tags {

+  Tags(const Tags&);

+  Tags& operator=(const Tags&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  Tags(Segment*, long long payload_start, long long payload_size,

+       long long element_start, long long element_size);

+  ~Tags();

+  long Parse();

+  class Tag;

+  class SimpleTag;

+  class SimpleTag {

+    friend class Tag;

+    SimpleTag();

+    SimpleTag(const SimpleTag&);

+    ~SimpleTag();

+    SimpleTag& operator=(const SimpleTag&);

+   public:

+    const char* GetTagName() const;

+    const char* GetTagString() const;

+   private:

+    void Init();

+    void ShallowCopy(SimpleTag&) const;

+    void Clear();

+    long Parse(IMkvReader*, long long pos, long long size);

+    char* m_tag_name;

+    char* m_tag_string;

+  };

+  class Tag {

+    friend class Tags;

+    Tag();

+    Tag(const Tag&);

+    ~Tag();

+    Tag& operator=(const Tag&);

+   public:

+    int GetSimpleTagCount() const;

+    const SimpleTag* GetSimpleTag(int index) const;

+   private:

+    void Init();

+    void ShallowCopy(Tag&) const;

+    void Clear();

+    long Parse(IMkvReader*, long long pos, long long size);

+    long ParseSimpleTag(IMkvReader*, long long pos, long long size);

+    bool ExpandSimpleTagsArray();

+    SimpleTag* m_simple_tags;

+    int m_simple_tags_size;

+    int m_simple_tags_count;

+  };

+  int GetTagCount() const;

+  const Tag* GetTag(int index) const;

+ private:

+  long ParseTag(long long pos, long long size);

+  bool ExpandTagsArray();

+  Tag* m_tags;

+  int m_tags_size;

+  int m_tags_count;

+};

+class SegmentInfo {

+  SegmentInfo(const SegmentInfo&);

+  SegmentInfo& operator=(const SegmentInfo&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  SegmentInfo(Segment*, long long start, long long size,

+              long long element_start, long long element_size);

+  ~SegmentInfo();

+  long Parse();

+  long long GetTimeCodeScale() const;

+  long long GetDuration() const;  // scaled

+  const char* GetMuxingAppAsUTF8() const;

+  const char* GetWritingAppAsUTF8() const;

+  const char* GetTitleAsUTF8() const;

+ private:

+  long long m_timecodeScale;

+  double m_duration;

+  char* m_pMuxingAppAsUTF8;

+  char* m_pWritingAppAsUTF8;

+  char* m_pTitleAsUTF8;

+};

+class SeekHead {

+  SeekHead(const SeekHead&);

+  SeekHead& operator=(const SeekHead&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  SeekHead(Segment*, long long start, long long size, long long element_start,

+           long long element_size);

+  ~SeekHead();

+  long Parse();

+  struct Entry {

+    // the SeekHead entry payload

+    long long id;

+    long long pos;

+    // absolute pos of SeekEntry ID

+    long long element_start;

+    // SeekEntry ID size + size size + payload

+    long long element_size;

+  };

+  int GetCount() const;

+  const Entry* GetEntry(int idx) const;

+  struct VoidElement {

+    // absolute pos of Void ID

+    long long element_start;

+    // ID size + size size + payload size

+    long long element_size;

+  };

+  int GetVoidElementCount() const;

+  const VoidElement* GetVoidElement(int idx) const;

+ private:

+  Entry* m_entries;

+  int m_entry_count;

+  VoidElement* m_void_elements;

+  int m_void_element_count;

+  static bool ParseEntry(IMkvReader*,

+                         long long pos,  // payload

+                         long long size, Entry*);

+};

+class Cues;

+class CuePoint {

+  friend class Cues;

+  CuePoint(long, long long);

+  ~CuePoint();

+  CuePoint(const CuePoint&);

+  CuePoint& operator=(const CuePoint&);

+ public:

+  long long m_element_start;

+  long long m_element_size;

+  bool Load(IMkvReader*);

+  long long GetTimeCode() const;  // absolute but unscaled

+  long long GetTime(const Segment*) const;  // absolute and scaled (ns units)

+  struct TrackPosition {

+    long long m_track;

+    long long m_pos;  // of cluster

+    long long m_block;

+    // codec_state  //defaults to 0

+    // reference = clusters containing req'd referenced blocks

+    //  reftime = timecode of the referenced block

+    bool Parse(IMkvReader*, long long, long long);

+  };

+  const TrackPosition* Find(const Track*) const;

+ private:

+  const long m_index;

+  long long m_timecode;

+  TrackPosition* m_track_positions;

+  size_t m_track_positions_count;

+};

+class Cues {

+  friend class Segment;

+  Cues(Segment*, long long start, long long size, long long element_start,

+       long long element_size);

+  ~Cues();

+  Cues(const Cues&);

+  Cues& operator=(const Cues&);

+ public:

+  Segment* const m_pSegment;

+  const long long m_start;

+  const long long m_size;

+  const long long m_element_start;

+  const long long m_element_size;

+  bool Find(  // lower bound of time_ns

+      long long time_ns, const Track*, const CuePoint*&,

+      const CuePoint::TrackPosition*&) const;

+  const CuePoint* GetFirst() const;

+  const CuePoint* GetLast() const;

+  const CuePoint* GetNext(const CuePoint*) const;

+  const BlockEntry* GetBlock(const CuePoint*,

+                             const CuePoint::TrackPosition*) const;

+  bool LoadCuePoint() const;

+  long GetCount() const;  // loaded only

+  // long GetTotal() const;  //loaded + preloaded

+  bool DoneParsing() const;

+ private:

+  bool Init() const;

+  bool PreloadCuePoint(long&, long long) const;

+  mutable CuePoint** m_cue_points;

+  mutable long m_count;

+  mutable long m_preload_count;

+  mutable long long m_pos;

+};

+class Cluster {

+  friend class Segment;

+  Cluster(const Cluster&);

+  Cluster& operator=(const Cluster&);

+ public:

+  Segment* const m_pSegment;

+ public:

+  static Cluster* Create(Segment*,

+                         long index,  // index in segment

+                         long long off);  // offset relative to segment

+  // long long element_size);

+  Cluster();  // EndOfStream

+  ~Cluster();

+  bool EOS() const;

+  long long GetTimeCode() const;  // absolute, but not scaled

+  long long GetTime() const;  // absolute, and scaled (nanosecond units)

+  long long GetFirstTime() const;  // time (ns) of first (earliest) block

+  long long GetLastTime() const;  // time (ns) of last (latest) block

+  long GetFirst(const BlockEntry*&) const;

+  long GetLast(const BlockEntry*&) const;

+  long GetNext(const BlockEntry* curr, const BlockEntry*& next) const;

+  const BlockEntry* GetEntry(const Track*, long long ns = -1) const;

+  const BlockEntry* GetEntry(const CuePoint&,

+                             const CuePoint::TrackPosition&) const;

+  // const BlockEntry* GetMaxKey(const VideoTrack*) const;

+  //    static bool HasBlockEntries(const Segment*, long long);

+  static long HasBlockEntries(const Segment*, long long idoff, long long& pos,

+                              long& size);

+  long GetEntryCount() const;

+  long Load(long long& pos, long& size) const;

+  long Parse(long long& pos, long& size) const;

+  long GetEntry(long index, const mkvparser::BlockEntry*&) const;

+ protected:

+  Cluster(Segment*, long index, long long element_start);

+  // long long element_size);

+ public:

+  const long long m_element_start;

+  long long GetPosition() const;  // offset relative to segment

+  long GetIndex() const;

+  long long GetElementSize() const;

+  // long long GetPayloadSize() const;

+  // long long Unparsed() const;

+ private:

+  long m_index;

+  mutable long long m_pos;

+  // mutable long long m_size;

+  mutable long long m_element_size;

+  mutable long long m_timecode;

+  mutable BlockEntry** m_entries;

+  mutable long m_entries_size;

+  mutable long m_entries_count;

+  long ParseSimpleBlock(long long, long long&, long&);

+  long ParseBlockGroup(long long, long long&, long&);

+  long CreateBlock(long long id, long long pos, long long size,

+                   long long discard_padding);

+  long CreateBlockGroup(long long start_offset, long long size,

+                        long long discard_padding);

+  long CreateSimpleBlock(long long, long long);

+};

+class Segment {

+  friend class Cues;

+  friend class Track;

+  friend class VideoTrack;

+  Segment(const Segment&);

+  Segment& operator=(const Segment&);

+ private:

+  Segment(IMkvReader*, long long elem_start,

+          // long long elem_size,

+          long long pos, long long size);

+ public:

+  IMkvReader* const m_pReader;

+  const long long m_element_start;

+  // const long long m_element_size;

+  const long long m_start;  // posn of segment payload

+  const long long m_size;  // size of segment payload

+  Cluster m_eos;  // TODO: make private?

+  static long long CreateInstance(IMkvReader*, long long, Segment*&);

+  ~Segment();

+  long Load();  // loads headers and all clusters

+  // for incremental loading

+  // long long Unparsed() const;

+  bool DoneParsing() const;

+  long long ParseHeaders();  // stops when first cluster is found

+  // long FindNextCluster(long long& pos, long& size) const;

+  long LoadCluster(long long& pos, long& size);  // load one cluster

+  long LoadCluster();

+  long ParseNext(const Cluster* pCurr, const Cluster*& pNext, long long& pos,

+                 long& size);

+  const SeekHead* GetSeekHead() const;

+  const Tracks* GetTracks() const;

+  const SegmentInfo* GetInfo() const;

+  const Cues* GetCues() const;

+  const Chapters* GetChapters() const;

+  const Tags* GetTags() const;

+  long long GetDuration() const;

+  unsigned long GetCount() const;

+  const Cluster* GetFirst() const;

+  const Cluster* GetLast() const;

+  const Cluster* GetNext(const Cluster*);

+  const Cluster* FindCluster(long long time_nanoseconds) const;

+  // const BlockEntry* Seek(long long time_nanoseconds, const Track*) const;

+  const Cluster* FindOrPreloadCluster(long long pos);

+  long ParseCues(long long cues_off,  // offset relative to start of segment

+                 long long& parse_pos, long& parse_len);

+ private:

+  long long m_pos;  // absolute file posn; what has been consumed so far

+  Cluster* m_pUnknownSize;

+  SeekHead* m_pSeekHead;

+  SegmentInfo* m_pInfo;

+  Tracks* m_pTracks;

+  Cues* m_pCues;

+  Chapters* m_pChapters;

+  Tags* m_pTags;

+  Cluster** m_clusters;

+  long m_clusterCount;  // number of entries for which m_index >= 0

+  long m_clusterPreloadCount;  // number of entries for which m_index < 0

+  long m_clusterSize;  // array size

+  long DoLoadCluster(long long&, long&);

+  long DoLoadClusterUnknownSize(long long&, long&);

+  long DoParseNext(const Cluster*&, long long&, long&);

+  bool AppendCluster(Cluster*);

+  bool PreloadCluster(Cluster*, ptrdiff_t);

+  // void ParseSeekHead(long long pos, long long size);

+  // void ParseSeekEntry(long long pos, long long size);

+  // void ParseCues(long long);

+  const BlockEntry* GetBlock(const CuePoint&, const CuePoint::TrackPosition&);

+};

+}  // namespace mkvparser

+inline long mkvparser::Segment::LoadCluster() {

+  long long pos;

+  long size;

+  return LoadCluster(pos, size);

+}

+#endif  // MKVPARSER_MKVPARSER_H_

--- /dev/null

+++ b/third_party/libwebm/mkvparser/mkvreader.cc

@@ -1,0 +1,131 @@

+// Copyright (c) 2010 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#include "mkvparser/mkvreader.h"

+#include <cassert>

+namespace mkvparser {

+MkvReader::MkvReader() : m_file(NULL), reader_owns_file_(true) {}

+MkvReader::MkvReader(FILE* fp) : m_file(fp), reader_owns_file_(false) {

+  GetFileSize();

+}

+MkvReader::~MkvReader() {

+  if (reader_owns_file_)

+    Close();

+  m_file = NULL;

+}

+int MkvReader::Open(const char* fileName) {

+  if (fileName == NULL)

+    return -1;

+  if (m_file)

+    return -1;

+#ifdef _MSC_VER

+  const errno_t e = fopen_s(&m_file, fileName, "rb");

+  if (e)

+    return -1;  // error

+#else

+  m_file = fopen(fileName, "rb");

+  if (m_file == NULL)

+    return -1;

+#endif

+  return !GetFileSize();

+}

+bool MkvReader::GetFileSize() {

+  if (m_file == NULL)

+    return false;

+#ifdef _MSC_VER

+  int status = _fseeki64(m_file, 0L, SEEK_END);

+  if (status)

+    return false;  // error

+  m_length = _ftelli64(m_file);

+#else

+  fseek(m_file, 0L, SEEK_END);

+  m_length = ftell(m_file);

+#endif

+  assert(m_length >= 0);

+  if (m_length < 0)

+    return false;

+#ifdef _MSC_VER

+  status = _fseeki64(m_file, 0L, SEEK_SET);

+  if (status)

+    return false;  // error

+#else

+  fseek(m_file, 0L, SEEK_SET);

+#endif

+  return true;

+}

+void MkvReader::Close() {

+  if (m_file != NULL) {

+    fclose(m_file);

+    m_file = NULL;

+  }

+}

+int MkvReader::Length(long long* total, long long* available) {

+  if (m_file == NULL)

+    return -1;

+  if (total)

+    *total = m_length;

+  if (available)

+    *available = m_length;

+  return 0;

+}

+int MkvReader::Read(long long offset, long len, unsigned char* buffer) {

+  if (m_file == NULL)

+    return -1;

+  if (offset < 0)

+    return -1;

+  if (len < 0)

+    return -1;

+  if (len == 0)

+    return 0;

+  if (offset >= m_length)

+    return -1;

+#ifdef _MSC_VER

+  const int status = _fseeki64(m_file, offset, SEEK_SET);

+  if (status)

+    return -1;  // error

+#else

+  fseek(m_file, offset, SEEK_SET);

+#endif

+  const size_t size = fread(buffer, 1, len, m_file);

+  if (size < size_t(len))

+    return -1;  // error

+  return 0;  // success

+}

+}  // namespace mkvparser

\ No newline at end of file

--- /dev/null

+++ b/third_party/libwebm/mkvparser/mkvreader.h

@@ -1,0 +1,45 @@

+// Copyright (c) 2010 The WebM project authors. All Rights Reserved.

+//

+// Use of this source code is governed by a BSD-style license

+// that can be found in the LICENSE file in the root of the source

+// tree. An additional intellectual property rights grant can be found

+// in the file PATENTS.  All contributing project authors may

+// be found in the AUTHORS file in the root of the source tree.

+#ifndef MKVPARSER_MKVREADER_H_

+#define MKVPARSER_MKVREADER_H_

+#include <cstdio>

+#include "mkvparser/mkvparser.h"

+namespace mkvparser {

+class MkvReader : public IMkvReader {

+ public:

+  MkvReader();

+  explicit MkvReader(FILE* fp);

+  virtual ~MkvReader();

+  int Open(const char*);

+  void Close();

+  virtual int Read(long long position, long length, unsigned char* buffer);

+  virtual int Length(long long* total, long long* available);

+ private:

+  MkvReader(const MkvReader&);

+  MkvReader& operator=(const MkvReader&);

+  // Determines the size of the file. This is called either by the constructor

+  // or by the Open function depending on file ownership. Returns true on

+  // success.

+  bool GetFileSize();

+  long long m_length;

+  FILE* m_file;

+  bool reader_owns_file_;

+};

+}  // namespace mkvparser

+#endif  // MKVPARSER_MKVREADER_H_

--- a/third_party/libwebm/mkvreader.cpp

+++ /dev/null

@@ -1,132 +1,0 @@

-// Copyright (c) 2010 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#include "mkvreader.hpp"

-#include <cassert>

-namespace mkvparser {

-MkvReader::MkvReader() : m_file(NULL), reader_owns_file_(true) {}

-MkvReader::MkvReader(FILE* fp) : m_file(fp), reader_owns_file_(false) {

-  GetFileSize();

-}

-MkvReader::~MkvReader() {

-  if (reader_owns_file_)

-    Close();

-  m_file = NULL;

-}

-int MkvReader::Open(const char* fileName) {

-  if (fileName == NULL)

-    return -1;

-  if (m_file)

-    return -1;

-#ifdef _MSC_VER

-  const errno_t e = fopen_s(&m_file, fileName, "rb");

-  if (e)

-    return -1;  // error

-#else

-  m_file = fopen(fileName, "rb");

-  if (m_file == NULL)

-    return -1;

-#endif

-  return !GetFileSize();

-}

-bool MkvReader::GetFileSize() {

-  if (m_file == NULL)

-    return false;

-#ifdef _MSC_VER

-  int status = _fseeki64(m_file, 0L, SEEK_END);

-  if (status)

-    return false;  // error

-  m_length = _ftelli64(m_file);

-#else

-  fseek(m_file, 0L, SEEK_END);

-  m_length = ftell(m_file);

-#endif

-  assert(m_length >= 0);

-  if (m_length < 0)

-    return false;

-#ifdef _MSC_VER

-  status = _fseeki64(m_file, 0L, SEEK_SET);

-  if (status)

-    return false;  // error

-#else

-  fseek(m_file, 0L, SEEK_SET);

-#endif

-  return true;

-}

-void MkvReader::Close() {

-  if (m_file != NULL) {

-    fclose(m_file);

-    m_file = NULL;

-  }

-}

-int MkvReader::Length(long long* total, long long* available) {

-  if (m_file == NULL)

-    return -1;

-  if (total)

-    *total = m_length;

-  if (available)

-    *available = m_length;

-  return 0;

-}

-int MkvReader::Read(long long offset, long len, unsigned char* buffer) {

-  if (m_file == NULL)

-    return -1;

-  if (offset < 0)

-    return -1;

-  if (len < 0)

-    return -1;

-  if (len == 0)

-    return 0;

-  if (offset >= m_length)

-    return -1;

-#ifdef _MSC_VER

-  const int status = _fseeki64(m_file, offset, SEEK_SET);

-  if (status)

-    return -1;  // error

-#else

-  fseek(m_file, offset, SEEK_SET);

-#endif

-  const size_t size = fread(buffer, 1, len, m_file);

-  if (size < size_t(len))

-    return -1;  // error

-  return 0;  // success

-}

-}  // end namespace mkvparser

--- a/third_party/libwebm/mkvreader.hpp

+++ /dev/null

@@ -1,45 +1,0 @@

-// Copyright (c) 2010 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVREADER_HPP

-#define MKVREADER_HPP

-#include "mkvparser.hpp"

-#include <cstdio>

-namespace mkvparser {

-class MkvReader : public IMkvReader {

- public:

-  MkvReader();

-  explicit MkvReader(FILE* fp);

-  virtual ~MkvReader();

-  int Open(const char*);

-  void Close();

-  virtual int Read(long long position, long length, unsigned char* buffer);

-  virtual int Length(long long* total, long long* available);

- private:

-  MkvReader(const MkvReader&);

-  MkvReader& operator=(const MkvReader&);

-  // Determines the size of the file. This is called either by the constructor

-  // or by the Open function depending on file ownership. Returns true on

-  // success.

-  bool GetFileSize();

-  long long m_length;

-  FILE* m_file;

-  bool reader_owns_file_;

-};

-}  // end namespace mkvparser

-#endif  // MKVREADER_HPP

--- a/third_party/libwebm/mkvwriter.cpp

+++ /dev/null

@@ -1,90 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#include "mkvwriter.hpp"

-#ifdef _MSC_VER

-#include <share.h>  // for _SH_DENYWR

-#endif

-#include <new>

-namespace mkvmuxer {

-MkvWriter::MkvWriter() : file_(NULL), writer_owns_file_(true) {}

-MkvWriter::MkvWriter(FILE* fp) : file_(fp), writer_owns_file_(false) {}

-MkvWriter::~MkvWriter() { Close(); }

-int32 MkvWriter::Write(const void* buffer, uint32 length) {

-  if (!file_)

-    return -1;

-  if (length == 0)

-    return 0;

-  if (buffer == NULL)

-    return -1;

-  const size_t bytes_written = fwrite(buffer, 1, length, file_);

-  return (bytes_written == length) ? 0 : -1;

-}

-bool MkvWriter::Open(const char* filename) {

-  if (filename == NULL)

-    return false;

-  if (file_)

-    return false;

-#ifdef _MSC_VER

-  file_ = _fsopen(filename, "wb", _SH_DENYWR);

-#else

-  file_ = fopen(filename, "wb");

-#endif

-  if (file_ == NULL)

-    return false;

-  return true;

-}

-void MkvWriter::Close() {

-  if (file_ && writer_owns_file_) {

-    fclose(file_);

-  }

-  file_ = NULL;

-}

-int64 MkvWriter::Position() const {

-  if (!file_)

-    return 0;

-#ifdef _MSC_VER

-  return _ftelli64(file_);

-#else

-  return ftell(file_);

-#endif

-}

-int32 MkvWriter::Position(int64 position) {

-  if (!file_)

-    return -1;

-#ifdef _MSC_VER

-  return _fseeki64(file_, position, SEEK_SET);

-#else

-  return fseek(file_, position, SEEK_SET);

-#endif

-}

-bool MkvWriter::Seekable() const { return true; }

-void MkvWriter::ElementStartNotify(uint64, int64) {}

-}  // namespace mkvmuxer

--- a/third_party/libwebm/mkvwriter.hpp

+++ /dev/null

@@ -1,51 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef MKVWRITER_HPP

-#define MKVWRITER_HPP

-#include <stdio.h>

-#include "mkvmuxer.hpp"

-#include "mkvmuxertypes.hpp"

-namespace mkvmuxer {

-// Default implementation of the IMkvWriter interface on Windows.

-class MkvWriter : public IMkvWriter {

- public:

-  MkvWriter();

-  explicit MkvWriter(FILE* fp);

-  virtual ~MkvWriter();

-  // IMkvWriter interface

-  virtual int64 Position() const;

-  virtual int32 Position(int64 position);

-  virtual bool Seekable() const;

-  virtual int32 Write(const void* buffer, uint32 length);

-  virtual void ElementStartNotify(uint64 element_id, int64 position);

-  // Creates and opens a file for writing. |filename| is the name of the file

-  // to open. This function will overwrite the contents of |filename|. Returns

-  // true on success.

-  bool Open(const char* filename);

-  // Closes an opened file.

-  void Close();

- private:

-  // File handle to output file.

-  FILE* file_;

-  bool writer_owns_file_;

-  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(MkvWriter);

-};

-}  // end namespace mkvmuxer

-#endif  // MKVWRITER_HPP

--- a/third_party/libwebm/webmids.hpp

+++ /dev/null

@@ -1,155 +1,0 @@

-// Copyright (c) 2012 The WebM project authors. All Rights Reserved.

-//

-// Use of this source code is governed by a BSD-style license

-// that can be found in the LICENSE file in the root of the source

-// tree. An additional intellectual property rights grant can be found

-// in the file PATENTS.  All contributing project authors may

-// be found in the AUTHORS file in the root of the source tree.

-#ifndef WEBMIDS_HPP

-#define WEBMIDS_HPP

-namespace mkvmuxer {

-enum MkvId {

-  kMkvEBML = 0x1A45DFA3,

-  kMkvEBMLVersion = 0x4286,

-  kMkvEBMLReadVersion = 0x42F7,

-  kMkvEBMLMaxIDLength = 0x42F2,

-  kMkvEBMLMaxSizeLength = 0x42F3,

-  kMkvDocType = 0x4282,

-  kMkvDocTypeVersion = 0x4287,

-  kMkvDocTypeReadVersion = 0x4285,

-  kMkvVoid = 0xEC,

-  kMkvSignatureSlot = 0x1B538667,

-  kMkvSignatureAlgo = 0x7E8A,

-  kMkvSignatureHash = 0x7E9A,

-  kMkvSignaturePublicKey = 0x7EA5,

-  kMkvSignature = 0x7EB5,

-  kMkvSignatureElements = 0x7E5B,

-  kMkvSignatureElementList = 0x7E7B,

-  kMkvSignedElement = 0x6532,

-  // segment

-  kMkvSegment = 0x18538067,

-  // Meta Seek Information

-  kMkvSeekHead = 0x114D9B74,

-  kMkvSeek = 0x4DBB,

-  kMkvSeekID = 0x53AB,

-  kMkvSeekPosition = 0x53AC,

-  // Segment Information

-  kMkvInfo = 0x1549A966,

-  kMkvTimecodeScale = 0x2AD7B1,

-  kMkvDuration = 0x4489,

-  kMkvDateUTC = 0x4461,

-  kMkvTitle = 0x7BA9,

-  kMkvMuxingApp = 0x4D80,

-  kMkvWritingApp = 0x5741,

-  // Cluster

-  kMkvCluster = 0x1F43B675,

-  kMkvTimecode = 0xE7,

-  kMkvPrevSize = 0xAB,

-  kMkvBlockGroup = 0xA0,

-  kMkvBlock = 0xA1,

-  kMkvBlockDuration = 0x9B,

-  kMkvReferenceBlock = 0xFB,

-  kMkvLaceNumber = 0xCC,

-  kMkvSimpleBlock = 0xA3,

-  kMkvBlockAdditions = 0x75A1,

-  kMkvBlockMore = 0xA6,

-  kMkvBlockAddID = 0xEE,

-  kMkvBlockAdditional = 0xA5,

-  kMkvDiscardPadding = 0x75A2,

-  // Track

-  kMkvTracks = 0x1654AE6B,

-  kMkvTrackEntry = 0xAE,

-  kMkvTrackNumber = 0xD7,

-  kMkvTrackUID = 0x73C5,

-  kMkvTrackType = 0x83,

-  kMkvFlagEnabled = 0xB9,

-  kMkvFlagDefault = 0x88,

-  kMkvFlagForced = 0x55AA,

-  kMkvFlagLacing = 0x9C,

-  kMkvDefaultDuration = 0x23E383,

-  kMkvMaxBlockAdditionID = 0x55EE,

-  kMkvName = 0x536E,

-  kMkvLanguage = 0x22B59C,

-  kMkvCodecID = 0x86,

-  kMkvCodecPrivate = 0x63A2,

-  kMkvCodecName = 0x258688,

-  kMkvCodecDelay = 0x56AA,

-  kMkvSeekPreRoll = 0x56BB,

-  // video

-  kMkvVideo = 0xE0,

-  kMkvFlagInterlaced = 0x9A,

-  kMkvStereoMode = 0x53B8,

-  kMkvAlphaMode = 0x53C0,

-  kMkvPixelWidth = 0xB0,

-  kMkvPixelHeight = 0xBA,

-  kMkvPixelCropBottom = 0x54AA,

-  kMkvPixelCropTop = 0x54BB,

-  kMkvPixelCropLeft = 0x54CC,

-  kMkvPixelCropRight = 0x54DD,

-  kMkvDisplayWidth = 0x54B0,

-  kMkvDisplayHeight = 0x54BA,

-  kMkvDisplayUnit = 0x54B2,

-  kMkvAspectRatioType = 0x54B3,

-  kMkvFrameRate = 0x2383E3,

-  // end video

-  // audio

-  kMkvAudio = 0xE1,

-  kMkvSamplingFrequency = 0xB5,

-  kMkvOutputSamplingFrequency = 0x78B5,

-  kMkvChannels = 0x9F,

-  kMkvBitDepth = 0x6264,

-  // end audio

-  // ContentEncodings

-  kMkvContentEncodings = 0x6D80,

-  kMkvContentEncoding = 0x6240,

-  kMkvContentEncodingOrder = 0x5031,

-  kMkvContentEncodingScope = 0x5032,

-  kMkvContentEncodingType = 0x5033,

-  kMkvContentCompression = 0x5034,

-  kMkvContentCompAlgo = 0x4254,

-  kMkvContentCompSettings = 0x4255,

-  kMkvContentEncryption = 0x5035,

-  kMkvContentEncAlgo = 0x47E1,

-  kMkvContentEncKeyID = 0x47E2,

-  kMkvContentSignature = 0x47E3,

-  kMkvContentSigKeyID = 0x47E4,

-  kMkvContentSigAlgo = 0x47E5,

-  kMkvContentSigHashAlgo = 0x47E6,

-  kMkvContentEncAESSettings = 0x47E7,

-  kMkvAESSettingsCipherMode = 0x47E8,

-  kMkvAESSettingsCipherInitData = 0x47E9,

-  // end ContentEncodings

-  // Cueing Data

-  kMkvCues = 0x1C53BB6B,

-  kMkvCuePoint = 0xBB,

-  kMkvCueTime = 0xB3,

-  kMkvCueTrackPositions = 0xB7,

-  kMkvCueTrack = 0xF7,

-  kMkvCueClusterPosition = 0xF1,

-  kMkvCueBlockNumber = 0x5378,

-  // Chapters

-  kMkvChapters = 0x1043A770,

-  kMkvEditionEntry = 0x45B9,

-  kMkvChapterAtom = 0xB6,

-  kMkvChapterUID = 0x73C4,

-  kMkvChapterStringUID = 0x5654,

-  kMkvChapterTimeStart = 0x91,

-  kMkvChapterTimeEnd = 0x92,

-  kMkvChapterDisplay = 0x80,

-  kMkvChapString = 0x85,

-  kMkvChapLanguage = 0x437C,

-  kMkvChapCountry = 0x437E,

-  // Tags

-  kMkvTags = 0x1254C367,

-  kMkvTag = 0x7373,

-  kMkvSimpleTag = 0x67C8,

-  kMkvTagName = 0x45A3,

-  kMkvTagString = 0x4487

-};

-}  // end namespace mkvmuxer

-#endif  // WEBMIDS_HPP

--- a/webmdec.cc

+++ b/webmdec.cc

@@ -13,8 +13,8 @@

 #include <cstring>

 #include <cstdio>

-#include "third_party/libwebm/mkvparser.hpp"

-#include "third_party/libwebm/mkvreader.hpp"

+#include "third_party/libwebm/mkvparser/mkvparser.h"

+#include "third_party/libwebm/mkvparser/mkvreader.h"

 namespace {

--- a/webmenc.cc

+++ b/webmenc.cc

@@ -11,9 +11,9 @@

 #include <string>

-#include "third_party/libwebm/mkvmuxer.hpp"

-#include "third_party/libwebm/mkvmuxerutil.hpp"

-#include "third_party/libwebm/mkvwriter.hpp"

+#include "third_party/libwebm/mkvmuxer/mkvmuxer.h"

+#include "third_party/libwebm/mkvmuxer/mkvmuxerutil.h"

+#include "third_party/libwebm/mkvmuxer/mkvwriter.h"

 namespace {

 const uint64_t kDebugTrackUid = 0xDEADBEEF;