ref: a9688dfdfbc4c80d47f58713daaae67b7f0d957f
dir: /libmkv/WebMElement.c/
// 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 "EbmlBufferWriter.h" #include "EbmlIDs.h" #include "WebMElement.h" #include <stdio.h> #define kVorbisPrivateMaxSize 4000 void writeHeader(EbmlGlobal *glob) { EbmlLoc start; Ebml_StartSubElement(glob, &start, EBML); Ebml_SerializeUnsigned(glob, EBMLVersion, 1); Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); // EBML Read Version Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); // EBML Max ID Length Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); // EBML Max Size Length Ebml_SerializeString(glob, DocType, "webm"); // Doc Type Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); // Doc Type Version Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); // Doc Type Read Version Ebml_EndSubElement(glob, &start); } void writeSimpleBlock(EbmlGlobal *glob, unsigned char trackNumber, short timeCode, int isKeyframe, unsigned char lacingFlag, int discardable, unsigned char *data, unsigned long dataLength) { Ebml_WriteID(glob, SimpleBlock); unsigned long blockLength = 4 + dataLength; blockLength |= 0x10000000; // TODO check length < 0x0FFFFFFFF Ebml_Serialize(glob, &blockLength, sizeof(blockLength), 4); trackNumber |= 0x80; // TODO check track nubmer < 128 Ebml_Write(glob, &trackNumber, 1); // Ebml_WriteSigned16(glob, timeCode,2); //this is 3 bytes Ebml_Serialize(glob, &timeCode, sizeof(timeCode), 2); unsigned char flags = 0x00 | (isKeyframe ? 0x80 : 0x00) | (lacingFlag << 1) | discardable; Ebml_Write(glob, &flags, 1); Ebml_Write(glob, data, dataLength); } static UInt64 generateTrackID(unsigned int trackNumber) { UInt64 t = time(NULL) * trackNumber; UInt64 r = rand(); r = r << 32; r += rand(); UInt64 rval = t ^ r; return rval; } void writeVideoTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing, char *codecId, unsigned int pixelWidth, unsigned int pixelHeight, double frameRate) { EbmlLoc start; Ebml_StartSubElement(glob, &start, TrackEntry); Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); UInt64 trackID = generateTrackID(trackNumber); Ebml_SerializeUnsigned(glob, TrackUID, trackID); Ebml_SerializeString(glob, CodecName, "VP8"); // TODO shouldn't be fixed Ebml_SerializeUnsigned(glob, TrackType, 1); // video is always 1 Ebml_SerializeString(glob, CodecID, codecId); { EbmlLoc videoStart; Ebml_StartSubElement(glob, &videoStart, Video); Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth); Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight); Ebml_SerializeFloat(glob, FrameRate, frameRate); Ebml_EndSubElement(glob, &videoStart); // Video } Ebml_EndSubElement(glob, &start); // Track Entry } void writeAudioTrack(EbmlGlobal *glob, unsigned int trackNumber, int flagLacing, char *codecId, double samplingFrequency, unsigned int channels, unsigned char *private, unsigned long privateSize) { EbmlLoc start; Ebml_StartSubElement(glob, &start, TrackEntry); Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber); UInt64 trackID = generateTrackID(trackNumber); Ebml_SerializeUnsigned(glob, TrackUID, trackID); Ebml_SerializeUnsigned(glob, TrackType, 2); // audio is always 2 // I am using defaults for thesed required fields /* Ebml_SerializeUnsigned(glob, FlagEnabled, 1); Ebml_SerializeUnsigned(glob, FlagDefault, 1); Ebml_SerializeUnsigned(glob, FlagForced, 1); Ebml_SerializeUnsigned(glob, FlagLacing, flagLacing);*/ Ebml_SerializeString(glob, CodecID, codecId); Ebml_SerializeData(glob, CodecPrivate, private, privateSize); Ebml_SerializeString(glob, CodecName, "VORBIS"); // fixed for now { EbmlLoc AudioStart; Ebml_StartSubElement(glob, &AudioStart, Audio); Ebml_SerializeFloat(glob, SamplingFrequency, samplingFrequency); Ebml_SerializeUnsigned(glob, Channels, channels); Ebml_EndSubElement(glob, &AudioStart); } Ebml_EndSubElement(glob, &start); } void writeSegmentInformation(EbmlGlobal *ebml, EbmlLoc *startInfo, unsigned long timeCodeScale, double duration) { Ebml_StartSubElement(ebml, startInfo, Info); Ebml_SerializeUnsigned(ebml, TimecodeScale, timeCodeScale); Ebml_SerializeFloat(ebml, Segment_Duration, duration * 1000.0); // Currently fixed to using milliseconds Ebml_SerializeString(ebml, 0x4D80, "QTmuxingAppLibWebM-0.0.1"); Ebml_SerializeString(ebml, 0x5741, "QTwritingAppLibWebM-0.0.1"); Ebml_EndSubElement(ebml, startInfo); } /* void Mkv_InitializeSegment(Ebml& ebml_out, EbmlLoc& ebmlLoc) { Ebml_StartSubElement(ebml_out, ebmlLoc, 0x18538067); } void Mkv_InitializeSeek(Ebml& ebml_out, EbmlLoc& ebmlLoc) { Ebml_StartSubElement(ebml_out, ebmlLoc, 0x114d9b74); } void Mkv_WriteSeekInformation(Ebml& ebml_out, SeekStruct& seekInformation) { EbmlLoc ebmlLoc; Ebml_StartSubElement(ebml_out, ebmlLoc, 0x4dbb); Ebml_SerializeString(ebml_out, 0x53ab, seekInformation.SeekID); Ebml_SerializeUnsigned(ebml_out, 0x53ac, seekInformation.SeekPosition); Ebml_EndSubElement(ebml_out, ebmlLoc); } void Mkv_WriteSegmentInformation(Ebml& ebml_out, SegmentInformationStruct& segmentInformation) { Ebml_SerializeUnsigned(ebml_out, 0x73a4, segmentInformation.segmentUID); if (segmentInformation.filename != 0) Ebml_SerializeString(ebml_out, 0x7384, segmentInformation.filename); Ebml_SerializeUnsigned(ebml_out, 0x2AD7B1, segmentInformation.TimecodeScale); Ebml_SerializeUnsigned(ebml_out, 0x4489, segmentInformation.Duration); // TODO date Ebml_SerializeWString(ebml_out, 0x4D80, L"MKVMUX"); Ebml_SerializeWString(ebml_out, 0x5741, segmentInformation.WritingApp); } void Mkv_InitializeTrack(Ebml& ebml_out, EbmlLoc& ebmlLoc) { Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1654AE6B); } static void Mkv_WriteGenericTrackData(Ebml& ebml_out, TrackStruct& track) { Ebml_SerializeUnsigned(ebml_out, 0xD7, track.TrackNumber); Ebml_SerializeUnsigned(ebml_out, 0x73C5, track.TrackUID); Ebml_SerializeUnsigned(ebml_out, 0x83, track.TrackType); Ebml_SerializeUnsigned(ebml_out, 0xB9, track.FlagEnabled ? 1 :0); Ebml_SerializeUnsigned(ebml_out, 0x88, track.FlagDefault ? 1 :0); Ebml_SerializeUnsigned(ebml_out, 0x55AA, track.FlagForced ? 1 :0); if (track.Language != 0) Ebml_SerializeString(ebml_out, 0x22B59C, track.Language); if (track.CodecID != 0) Ebml_SerializeString(ebml_out, 0x86, track.CodecID); if (track.CodecPrivate != 0) Ebml_SerializeData(ebml_out, 0x63A2, track.CodecPrivate, track.CodecPrivateLength); if (track.CodecName != 0) Ebml_SerializeWString(ebml_out, 0x258688, track.CodecName); } void Mkv_WriteVideoTrack(Ebml& ebml_out, TrackStruct & track, VideoTrackStruct& video) { EbmlLoc trackHeadLoc, videoHeadLoc; Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); // start Track Mkv_WriteGenericTrackData(ebml_out, track); Ebml_StartSubElement(ebml_out, videoHeadLoc, 0xE0); // start Video Ebml_SerializeUnsigned(ebml_out, 0x9A, video.FlagInterlaced ? 1 :0); Ebml_SerializeUnsigned(ebml_out, 0xB0, video.PixelWidth); Ebml_SerializeUnsigned(ebml_out, 0xBA, video.PixelHeight); Ebml_SerializeUnsigned(ebml_out, 0x54B0, video.PixelDisplayWidth); Ebml_SerializeUnsigned(ebml_out, 0x54BA, video.PixelDisplayHeight); Ebml_SerializeUnsigned(ebml_out, 0x54B2, video.displayUnit); Ebml_SerializeFloat(ebml_out, 0x2383E3, video.FrameRate); Ebml_EndSubElement(ebml_out, videoHeadLoc); Ebml_EndSubElement(ebml_out, trackHeadLoc); } void Mkv_WriteAudioTrack(Ebml& ebml_out, TrackStruct & track, AudioTrackStruct& video) { EbmlLoc trackHeadLoc, audioHeadLoc; Ebml_StartSubElement(ebml_out, trackHeadLoc, 0xAE); Mkv_WriteGenericTrackData(ebml_out, track); Ebml_StartSubElement(ebml_out, audioHeadLoc, 0xE0); // start Audio Ebml_SerializeFloat(ebml_out, 0xB5, video.SamplingFrequency); Ebml_SerializeUnsigned(ebml_out, 0x9F, video.Channels); Ebml_SerializeUnsigned(ebml_out, 0x6264, video.BitDepth); Ebml_EndSubElement(ebml_out, audioHeadLoc); // end audio Ebml_EndSubElement(ebml_out, trackHeadLoc); } void Mkv_WriteEbmlClusterHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, ClusterHeadStruct & clusterHead) { Ebml_StartSubElement(ebml_out, ebmlLoc, 0x1F43B675); Ebml_SerializeUnsigned(ebml_out, 0x6264, clusterHead.TimeCode); } void Mkv_WriteSimpleBlockHead(Ebml& ebml_out, EbmlLoc& ebmlLoc, SimpleBlockStruct& block) { Ebml_StartSubElement(ebml_out, ebmlLoc, 0xA3); Ebml_Write1UInt(ebml_out, block.TrackNumber); Ebml_WriteSigned16(ebml_out,block.TimeCode); unsigned char flags = 0x00 | (block.iskey ? 0x80:0x00) | (block.lacing << 1) | block.discardable; Ebml_Write1UInt(ebml_out, flags); // TODO this may be the wrong function Ebml_Serialize(ebml_out, block.data, block.dataLength); Ebml_EndSubElement(ebml_out,ebmlLoc); } */