ref: fde50d93b2284178743a12e8c359286ea99f0b21
dir: /src/libflac/stream_decoder.c/
/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2000-2009 Josh Coalson
* Copyright (C) 2011-2016 Xiph.Org Foundation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// 8bb: hide POSIX warnings
#ifdef _MSC_VER
#pragma warning(disable: 4996)
#endif
#include <stdio.h>
#include <stdlib.h> /* for malloc() */
#include <string.h> /* for memset/memcpy() */
#include <sys/stat.h> /* for stat() */
#include <sys/types.h> /* for off_t */
#include "share/compat.h"
#include "share/alloc.h"
#include "protected/stream_decoder.h"
#include "private/bitreader.h"
#include "private/bitmath.h"
#include "private/crc.h"
#include "private/fixed.h"
#include "private/format.h"
#include "private/lpc.h"
#include "private/md5.h"
#include "private/memory.h"
#include "private/macros.h"
/***********************************************************************
*
* Private static data
*
***********************************************************************/
static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
/***********************************************************************
*
* Private class method prototypes
*
***********************************************************************/
static void set_defaults_(FLAC__StreamDecoder *decoder);
static FILE *get_binary_stdin_(void);
static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels);
static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length);
static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length);
static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode);
static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode);
static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
/***********************************************************************
*
* Private class data
*
***********************************************************************/
typedef struct FLAC__StreamDecoderPrivate {
FLAC__bool is_ogg;
FLAC__StreamDecoderReadCallback read_callback;
FLAC__StreamDecoderSeekCallback seek_callback;
FLAC__StreamDecoderTellCallback tell_callback;
FLAC__StreamDecoderLengthCallback length_callback;
FLAC__StreamDecoderEofCallback eof_callback;
FLAC__StreamDecoderWriteCallback write_callback;
FLAC__StreamDecoderMetadataCallback metadata_callback;
FLAC__StreamDecoderErrorCallback error_callback;
/* generic 32-bit datapath: */
void (*local_lpc_restore_signal)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
/* generic 64-bit datapath: */
void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
/* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]);
void *client_data;
FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
FLAC__BitReader *input;
FLAC__int32 *output[FLAC__MAX_CHANNELS];
FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
uint32_t output_capacity, output_channels;
FLAC__uint32 fixed_block_size, next_fixed_block_size;
FLAC__uint64 samples_decoded;
FLAC__bool has_stream_info, has_seek_table;
FLAC__StreamMetadata stream_info;
FLAC__StreamMetadata seek_table;
FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
FLAC__byte *metadata_filter_ids;
size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
FLAC__Frame frame;
FLAC__bool cached; /* true if there is a byte in lookahead */
FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
/* unaligned (original) pointers to allocated data */
FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
FLAC__bool is_seeking;
FLAC__MD5Context md5context;
FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
/* (the rest of these are only used for seeking) */
FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
FLAC__uint64 target_sample;
uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
} FLAC__StreamDecoderPrivate;
/***********************************************************************
*
* Public static class data
*
***********************************************************************/
FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
"FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
"FLAC__STREAM_DECODER_READ_METADATA",
"FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
"FLAC__STREAM_DECODER_READ_FRAME",
"FLAC__STREAM_DECODER_END_OF_STREAM",
"FLAC__STREAM_DECODER_OGG_ERROR",
"FLAC__STREAM_DECODER_SEEK_ERROR",
"FLAC__STREAM_DECODER_ABORTED",
"FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
"FLAC__STREAM_DECODER_UNINITIALIZED"
};
FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
"FLAC__STREAM_DECODER_INIT_STATUS_OK",
"FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
"FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
"FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
"FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
"FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
};
FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
"FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
"FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
"FLAC__STREAM_DECODER_READ_STATUS_ABORT"
};
FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
"FLAC__STREAM_DECODER_SEEK_STATUS_OK",
"FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
"FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
};
FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
"FLAC__STREAM_DECODER_TELL_STATUS_OK",
"FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
"FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
};
FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
"FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
"FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
"FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
};
FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
"FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
"FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
};
FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
"FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
"FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
"FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
"FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
};
/***********************************************************************
*
* Class constructor/destructor
*
***********************************************************************/
FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
{
FLAC__StreamDecoder *decoder;
uint32_t i;
decoder = calloc(1, sizeof(FLAC__StreamDecoder));
if(decoder == 0) {
return 0;
}
decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected));
if(decoder->protected_ == 0) {
free(decoder);
return 0;
}
decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate));
if(decoder->private_ == 0) {
free(decoder->protected_);
free(decoder);
return 0;
}
decoder->private_->input = FLAC__bitreader_new();
if(decoder->private_->input == 0) {
free(decoder->private_);
free(decoder->protected_);
free(decoder);
return 0;
}
decoder->private_->metadata_filter_ids_capacity = 16;
if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
FLAC__bitreader_delete(decoder->private_->input);
free(decoder->private_);
free(decoder->protected_);
free(decoder);
return 0;
}
for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
decoder->private_->output[i] = 0;
decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
}
decoder->private_->output_capacity = 0;
decoder->private_->output_channels = 0;
decoder->private_->has_seek_table = false;
for(i = 0; i < FLAC__MAX_CHANNELS; i++)
FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
decoder->private_->file = 0;
set_defaults_(decoder);
decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
return decoder;
}
FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
{
uint32_t i;
if (decoder == NULL)
return ;
(void)FLAC__stream_decoder_finish(decoder);
if(0 != decoder->private_->metadata_filter_ids)
free(decoder->private_->metadata_filter_ids);
FLAC__bitreader_delete(decoder->private_->input);
for(i = 0; i < FLAC__MAX_CHANNELS; i++)
FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
free(decoder->private_);
free(decoder->protected_);
free(decoder);
}
/***********************************************************************
*
* Public class methods
*
***********************************************************************/
static FLAC__StreamDecoderInitStatus init_stream_internal_(
FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderReadCallback read_callback,
FLAC__StreamDecoderSeekCallback seek_callback,
FLAC__StreamDecoderTellCallback tell_callback,
FLAC__StreamDecoderLengthCallback length_callback,
FLAC__StreamDecoderEofCallback eof_callback,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data,
FLAC__bool is_ogg
)
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
if(is_ogg)
return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
if(
0 == read_callback ||
0 == write_callback ||
0 == error_callback ||
(seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
)
return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
/* from here on, errors are fatal */
if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
}
decoder->private_->read_callback = read_callback;
decoder->private_->seek_callback = seek_callback;
decoder->private_->tell_callback = tell_callback;
decoder->private_->length_callback = length_callback;
decoder->private_->eof_callback = eof_callback;
decoder->private_->write_callback = write_callback;
decoder->private_->metadata_callback = metadata_callback;
decoder->private_->error_callback = error_callback;
decoder->private_->client_data = client_data;
decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
decoder->private_->samples_decoded = 0;
decoder->private_->has_stream_info = false;
decoder->private_->cached = false;
decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
decoder->private_->is_seeking = false;
decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
if(!FLAC__stream_decoder_reset(decoder)) {
/* above call sets the state for us */
return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
}
return FLAC__STREAM_DECODER_INIT_STATUS_OK;
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderReadCallback read_callback,
FLAC__StreamDecoderSeekCallback seek_callback,
FLAC__StreamDecoderTellCallback tell_callback,
FLAC__StreamDecoderLengthCallback length_callback,
FLAC__StreamDecoderEofCallback eof_callback,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_stream_internal_(
decoder,
read_callback,
seek_callback,
tell_callback,
length_callback,
eof_callback,
write_callback,
metadata_callback,
error_callback,
client_data,
/*is_ogg=*/false
);
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderReadCallback read_callback,
FLAC__StreamDecoderSeekCallback seek_callback,
FLAC__StreamDecoderTellCallback tell_callback,
FLAC__StreamDecoderLengthCallback length_callback,
FLAC__StreamDecoderEofCallback eof_callback,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_stream_internal_(
decoder,
read_callback,
seek_callback,
tell_callback,
length_callback,
eof_callback,
write_callback,
metadata_callback,
error_callback,
client_data,
/*is_ogg=*/true
);
}
static FLAC__StreamDecoderInitStatus init_FILE_internal_(
FLAC__StreamDecoder *decoder,
FILE *file,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data,
FLAC__bool is_ogg
)
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
if(0 == write_callback || 0 == error_callback)
return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
/*
* To make sure that our file does not go unclosed after an error, we
* must assign the FILE pointer before any further error can occur in
* this routine.
*/
if(file == stdin)
file = get_binary_stdin_(); /* just to be safe */
decoder->private_->file = file;
return init_stream_internal_(
decoder,
file_read_callback_,
decoder->private_->file == stdin? 0: file_seek_callback_,
decoder->private_->file == stdin? 0: file_tell_callback_,
decoder->private_->file == stdin? 0: file_length_callback_,
file_eof_callback_,
write_callback,
metadata_callback,
error_callback,
client_data,
is_ogg
);
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
FLAC__StreamDecoder *decoder,
FILE *file,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
FLAC__StreamDecoder *decoder,
FILE *file,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
}
static FLAC__StreamDecoderInitStatus init_file_internal_(
FLAC__StreamDecoder *decoder,
const char *filename,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data,
FLAC__bool is_ogg
)
{
FILE *file;
/*
* To make sure that our file does not go unclosed after an error, we
* have to do the same entrance checks here that are later performed
* in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
*/
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
if(0 == write_callback || 0 == error_callback)
return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
file = filename? flac_fopen(filename, "rb") : stdin;
if(0 == file)
return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
FLAC__StreamDecoder *decoder,
const char *filename,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
}
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
FLAC__StreamDecoder *decoder,
const char *filename,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
)
{
return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
}
FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
{
FLAC__bool md5_failed = false;
uint32_t i;
if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
return true;
/* see the comment in FLAC__stream_decoder_reset() as to why we
* always call FLAC__MD5Final()
*/
FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
free(decoder->private_->seek_table.data.seek_table.points);
decoder->private_->seek_table.data.seek_table.points = 0;
decoder->private_->has_seek_table = false;
FLAC__bitreader_free(decoder->private_->input);
for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
/* WATCHOUT:
* FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
* require that the output arrays have a buffer of up to 3 zeroes
* in front (at negative indices) for alignment purposes;
* we use 4 to keep the data well-aligned.
*/
if(0 != decoder->private_->output[i]) {
free(decoder->private_->output[i]-4);
decoder->private_->output[i] = 0;
}
if(0 != decoder->private_->residual_unaligned[i]) {
free(decoder->private_->residual_unaligned[i]);
decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
}
}
decoder->private_->output_capacity = 0;
decoder->private_->output_channels = 0;
if(0 != decoder->private_->file) {
if(decoder->private_->file != stdin)
fclose(decoder->private_->file);
decoder->private_->file = 0;
}
if(decoder->private_->do_md5_checking) {
if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
md5_failed = true;
}
decoder->private_->is_seeking = false;
set_defaults_(decoder);
decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
return !md5_failed;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
(void)value;
return false;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
decoder->protected_->md5_checking = value;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
{
/* double protection */
if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
return false;
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
decoder->private_->metadata_filter[type] = true;
if(type == FLAC__METADATA_TYPE_APPLICATION)
decoder->private_->metadata_filter_ids_count = 0;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
return true;
if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
decoder->private_->metadata_filter_ids_capacity *= 2;
}
memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
decoder->private_->metadata_filter_ids_count++;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
{
uint32_t i;
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
decoder->private_->metadata_filter[i] = true;
decoder->private_->metadata_filter_ids_count = 0;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
{
/* double protection */
if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE)
return false;
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
decoder->private_->metadata_filter[type] = false;
if(type == FLAC__METADATA_TYPE_APPLICATION)
decoder->private_->metadata_filter_ids_count = 0;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
return true;
if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
decoder->private_->metadata_filter_ids_capacity *= 2;
}
memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
decoder->private_->metadata_filter_ids_count++;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
{
if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
decoder->private_->metadata_filter_ids_count = 0;
return true;
}
FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->state;
}
FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
{
return FLAC__StreamDecoderStateString[decoder->protected_->state];
}
FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->md5_checking;
}
FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
{
return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
}
FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->channels;
}
FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->channel_assignment;
}
FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->bits_per_sample;
}
FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->sample_rate;
}
FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
{
return decoder->protected_->blocksize;
}
FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
{
if(0 == decoder->private_->tell_callback)
return false;
if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
return false;
/* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
return false;
*position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
{
if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
return false;
decoder->private_->samples_decoded = 0;
decoder->private_->do_md5_checking = false;
if(!FLAC__bitreader_clear(decoder->private_->input)) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
{
if(!FLAC__stream_decoder_flush(decoder)) {
/* above call sets the state for us */
return false;
}
/* Rewind if necessary. If FLAC__stream_decoder_init() is calling us,
* (internal_reset_hack) don't try to rewind since we are already at
* the beginning of the stream and don't want to fail if the input is
* not seekable.
*/
if(!decoder->private_->internal_reset_hack) {
if(decoder->private_->file == stdin)
return false; /* can't rewind stdin, reset fails */
if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
return false; /* seekable and seek fails, reset fails */
}
else
decoder->private_->internal_reset_hack = false;
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
decoder->private_->has_stream_info = false;
free(decoder->private_->seek_table.data.seek_table.points);
decoder->private_->seek_table.data.seek_table.points = 0;
decoder->private_->has_seek_table = false;
decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
/*
* This goes in reset() and not flush() because according to the spec, a
* fixed-blocksize stream must stay that way through the whole stream.
*/
decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
/* We initialize the FLAC__MD5Context even though we may never use it. This
* is because md5 checking may be turned on to start and then turned off if
* a seek occurs. So we init the context here and finalize it in
* FLAC__stream_decoder_finish() to make sure things are always cleaned up
* properly.
*/
FLAC__MD5Init(&decoder->private_->md5context);
decoder->private_->first_frame_offset = 0;
decoder->private_->unparseable_frame_count = 0;
return true;
}
FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
{
FLAC__bool got_a_frame;
while(1) {
switch(decoder->protected_->state) {
case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
if(!find_metadata_(decoder))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_METADATA:
if(!read_metadata_(decoder))
return false; /* above function sets the status for us */
else
return true;
case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
if(!frame_sync_(decoder))
return true; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_FRAME:
if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
return false; /* above function sets the status for us */
if(got_a_frame)
return true; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_END_OF_STREAM:
case FLAC__STREAM_DECODER_ABORTED:
return true;
default:
return false;
}
}
}
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
{
while(1) {
switch(decoder->protected_->state) {
case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
if(!find_metadata_(decoder))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_METADATA:
if(!read_metadata_(decoder))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
case FLAC__STREAM_DECODER_READ_FRAME:
case FLAC__STREAM_DECODER_END_OF_STREAM:
case FLAC__STREAM_DECODER_ABORTED:
return true;
default:
return false;
}
}
}
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
{
FLAC__bool dummy;
while(1) {
switch(decoder->protected_->state) {
case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
if(!find_metadata_(decoder))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_METADATA:
if(!read_metadata_(decoder))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
if(!frame_sync_(decoder))
return true; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_FRAME:
if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
return false; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_END_OF_STREAM:
case FLAC__STREAM_DECODER_ABORTED:
return true;
default:
return false;
}
}
}
FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
{
FLAC__bool got_a_frame;
while(1) {
switch(decoder->protected_->state) {
case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
case FLAC__STREAM_DECODER_READ_METADATA:
return false; /* above function sets the status for us */
case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
if(!frame_sync_(decoder))
return true; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_READ_FRAME:
if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
return false; /* above function sets the status for us */
if(got_a_frame)
return true; /* above function sets the status for us */
break;
case FLAC__STREAM_DECODER_END_OF_STREAM:
case FLAC__STREAM_DECODER_ABORTED:
return true;
default:
return false;
}
}
}
FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
{
FLAC__uint64 length;
if(
decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
)
return false;
if(0 == decoder->private_->seek_callback)
return false;
if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
return false;
decoder->private_->is_seeking = true;
/* turn off md5 checking if a seek is attempted */
decoder->private_->do_md5_checking = false;
/* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
decoder->private_->is_seeking = false;
return false;
}
/* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
if(
decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
) {
if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
/* above call sets the state for us */
decoder->private_->is_seeking = false;
return false;
}
/* check this again in case we didn't know total_samples the first time */
if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
decoder->private_->is_seeking = false;
return false;
}
}
{
const FLAC__bool ok = seek_to_absolute_sample_(decoder, length, sample);
decoder->private_->is_seeking = false;
return ok;
}
}
/***********************************************************************
*
* Protected class methods
*
***********************************************************************/
uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
{
return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
}
/***********************************************************************
*
* Private class methods
*
***********************************************************************/
void set_defaults_(FLAC__StreamDecoder *decoder)
{
decoder->private_->is_ogg = false;
decoder->private_->read_callback = 0;
decoder->private_->seek_callback = 0;
decoder->private_->tell_callback = 0;
decoder->private_->length_callback = 0;
decoder->private_->eof_callback = 0;
decoder->private_->write_callback = 0;
decoder->private_->metadata_callback = 0;
decoder->private_->error_callback = 0;
decoder->private_->client_data = 0;
memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
decoder->private_->metadata_filter_ids_count = 0;
decoder->protected_->md5_checking = false;
}
/*
* This will forcibly set stdin to binary mode (for OSes that require it)
*/
FILE *get_binary_stdin_(void)
{
/* if something breaks here it is probably due to the presence or
* absence of an underscore before the identifiers 'setmode',
* 'fileno', and/or 'O_BINARY'; check your system header files.
*/
#if defined _MSC_VER || defined __MINGW32__
_setmode(_fileno(stdin), _O_BINARY);
#elif defined __EMX__
setmode(fileno(stdin), O_BINARY);
#endif
return stdin;
}
FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels)
{
uint32_t i;
FLAC__int32 *tmp;
if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
return true;
/* simply using realloc() is not practical because the number of channels may change mid-stream */
for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
if(0 != decoder->private_->output[i]) {
free(decoder->private_->output[i]-4);
decoder->private_->output[i] = 0;
}
if(0 != decoder->private_->residual_unaligned[i]) {
free(decoder->private_->residual_unaligned[i]);
decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
}
}
for(i = 0; i < channels; i++) {
/* WATCHOUT:
* FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN()
* require that the output arrays have a buffer of up to 3 zeroes
* in front (at negative indices) for alignment purposes;
* we use 4 to keep the data well-aligned.
*/
tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/);
if(tmp == 0) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
memset(tmp, 0, sizeof(FLAC__int32)*4);
decoder->private_->output[i] = tmp + 4;
if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
}
decoder->private_->output_capacity = size;
decoder->private_->output_channels = channels;
return true;
}
FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
{
size_t i;
for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
return true;
return false;
}
FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
{
FLAC__uint32 x;
uint32_t i, id;
FLAC__bool first = true;
for(i = id = 0; i < 4; ) {
if(decoder->private_->cached) {
x = (FLAC__uint32)decoder->private_->lookahead;
decoder->private_->cached = false;
}
else {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
}
if(x == FLAC__STREAM_SYNC_STRING[i]) {
first = true;
i++;
id = 0;
continue;
}
if(id >= 3)
return false;
if(x == ID3V2_TAG_[id]) {
id++;
i = 0;
if(id == 3) {
if(!skip_id3v2_tag_(decoder))
return false; /* skip_id3v2_tag_ sets the state for us */
}
continue;
}
id = 0;
if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
decoder->private_->header_warmup[0] = (FLAC__byte)x;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
/* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
/* else we have to check if the second byte is the end of a sync code */
if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
decoder->private_->lookahead = (FLAC__byte)x;
decoder->private_->cached = true;
}
else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
decoder->private_->header_warmup[1] = (FLAC__byte)x;
decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
return true;
}
}
i = 0;
if(first) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
first = false;
}
}
decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
return true;
}
FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
{
FLAC__bool is_last;
FLAC__uint32 i, x, type, length;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
return false; /* read_callback_ sets the state for us */
is_last = x? true : false;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
return false; /* read_callback_ sets the state for us */
if(type == FLAC__METADATA_TYPE_STREAMINFO) {
if(!read_metadata_streaminfo_(decoder, is_last, length))
return false;
decoder->private_->has_stream_info = true;
if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
decoder->private_->do_md5_checking = false;
if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
}
else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
/* just in case we already have a seek table, and reading the next one fails: */
decoder->private_->has_seek_table = false;
if(!read_metadata_seektable_(decoder, is_last, length))
return false;
decoder->private_->has_seek_table = true;
if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
}
else {
FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
uint32_t real_length = length;
FLAC__StreamMetadata block;
memset(&block, 0, sizeof(block));
block.is_last = is_last;
block.type = (FLAC__MetadataType)type;
block.length = length;
if(type == FLAC__METADATA_TYPE_APPLICATION) {
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
return false; /* read_callback_ sets the state for us */
if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/
return false;
}
real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
skip_it = !skip_it;
}
if(skip_it) {
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
return false; /* read_callback_ sets the state for us */
}
else {
FLAC__bool ok = true;
switch(type) {
case FLAC__METADATA_TYPE_PADDING:
/* skip the padding bytes */
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
ok = false; /* read_callback_ sets the state for us */
break;
case FLAC__METADATA_TYPE_APPLICATION:
/* remember, we read the ID already */
if(real_length > 0) {
if(0 == (block.data.application.data = malloc(real_length))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
ok = false;
}
else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
ok = false; /* read_callback_ sets the state for us */
}
else
block.data.application.data = 0;
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length))
ok = false;
break;
case FLAC__METADATA_TYPE_CUESHEET:
if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
ok = false;
break;
case FLAC__METADATA_TYPE_PICTURE:
if(!read_metadata_picture_(decoder, &block.data.picture))
ok = false;
break;
case FLAC__METADATA_TYPE_STREAMINFO:
case FLAC__METADATA_TYPE_SEEKTABLE:
break;
default:
if(real_length > 0) {
if(0 == (block.data.unknown.data = malloc(real_length))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
ok = false;
}
else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
ok = false; /* read_callback_ sets the state for us */
}
else
block.data.unknown.data = 0;
break;
}
if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback)
decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
/* now we have to free any malloc()ed data in the block */
switch(type) {
case FLAC__METADATA_TYPE_PADDING:
break;
case FLAC__METADATA_TYPE_APPLICATION:
if(0 != block.data.application.data)
free(block.data.application.data);
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
if(0 != block.data.vorbis_comment.vendor_string.entry)
free(block.data.vorbis_comment.vendor_string.entry);
if(block.data.vorbis_comment.num_comments > 0)
for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
if(0 != block.data.vorbis_comment.comments[i].entry)
free(block.data.vorbis_comment.comments[i].entry);
if(0 != block.data.vorbis_comment.comments)
free(block.data.vorbis_comment.comments);
break;
case FLAC__METADATA_TYPE_CUESHEET:
if(block.data.cue_sheet.num_tracks > 0)
for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
if(0 != block.data.cue_sheet.tracks[i].indices)
free(block.data.cue_sheet.tracks[i].indices);
if(0 != block.data.cue_sheet.tracks)
free(block.data.cue_sheet.tracks);
break;
case FLAC__METADATA_TYPE_PICTURE:
if(0 != block.data.picture.mime_type)
free(block.data.picture.mime_type);
if(0 != block.data.picture.description)
free(block.data.picture.description);
if(0 != block.data.picture.data)
free(block.data.picture.data);
break;
case FLAC__METADATA_TYPE_STREAMINFO:
case FLAC__METADATA_TYPE_SEEKTABLE:
default:
if(0 != block.data.unknown.data)
free(block.data.unknown.data);
break;
}
if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */
return false;
}
}
if(is_last) {
/* if this fails, it's OK, it's just a hint for the seek routine */
if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
decoder->private_->first_frame_offset = 0;
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
}
return true;
}
FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
{
FLAC__uint32 x;
uint32_t bits, used_bits = 0;
decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
decoder->private_->stream_info.is_last = is_last;
decoder->private_->stream_info.length = length;
bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.min_blocksize = x;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.max_blocksize = x;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.min_framesize = x;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.max_framesize = x;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.sample_rate = x;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.channels = x+1;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
used_bits += bits;
bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
return false; /* read_callback_ sets the state for us */
used_bits += bits;
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
return false; /* read_callback_ sets the state for us */
used_bits += 16*8;
/* skip the rest of the block */
length -= (used_bits / 8);
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
return false; /* read_callback_ sets the state for us */
return true;
}
FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length)
{
FLAC__uint32 i, x;
FLAC__uint64 xx;
decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
decoder->private_->seek_table.is_last = is_last;
decoder->private_->seek_table.length = length;
decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
/* use realloc since we may pass through here several times (e.g. after seeking) */
if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
return false; /* read_callback_ sets the state for us */
decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
}
length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
/* if there is a partial point left, skip over it */
if(length > 0) {
/*@@@ do a send_error_to_client_() here? there's an argument for either way */
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
return false; /* read_callback_ sets the state for us */
}
return true;
}
FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length)
{
FLAC__uint32 i;
/* read vendor string */
if (length >= 8) {
length -= 8; /* vendor string length + num comments entries alone take 8 bytes */
if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
return false; /* read_callback_ sets the state for us */
if (obj->vendor_string.length > 0) {
if (length < obj->vendor_string.length) {
obj->vendor_string.length = 0;
obj->vendor_string.entry = 0;
goto skip;
}
else
length -= obj->vendor_string.length;
if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
return false; /* read_callback_ sets the state for us */
obj->vendor_string.entry[obj->vendor_string.length] = '\0';
}
else
obj->vendor_string.entry = 0;
/* read num comments */
if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
return false; /* read_callback_ sets the state for us */
/* read comments */
if (obj->num_comments > 100000) {
/* Possibly malicious file. */
obj->num_comments = 0;
return false;
}
if (obj->num_comments > 0) {
if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
obj->num_comments = 0;
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
for (i = 0; i < obj->num_comments; i++) {
/* Initialize here just to make sure. */
obj->comments[i].length = 0;
obj->comments[i].entry = 0;
if (length < 4) {
obj->num_comments = i;
goto skip;
}
else
length -= 4;
if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) {
obj->num_comments = i;
return false; /* read_callback_ sets the state for us */
}
if (obj->comments[i].length > 0) {
if (length < obj->comments[i].length) {
obj->num_comments = i;
goto skip;
}
else
length -= obj->comments[i].length;
if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
obj->num_comments = i;
return false;
}
memset (obj->comments[i].entry, 0, obj->comments[i].length) ;
if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) {
/* Current i-th entry is bad, so we delete it. */
free (obj->comments[i].entry) ;
obj->comments[i].entry = NULL ;
obj->num_comments = i;
goto skip;
}
obj->comments[i].entry[obj->comments[i].length] = '\0';
}
else
obj->comments[i].entry = 0;
}
}
}
skip:
if (length > 0) {
/* length > 0 can only happen on files with invalid data in comments */
if(obj->num_comments < 1) {
free(obj->comments);
obj->comments = NULL;
}
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
return false; /* read_callback_ sets the state for us */
}
return true;
}
FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
{
FLAC__uint32 i, j, x;
memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
return false; /* read_callback_ sets the state for us */
obj->is_cd = x? true : false;
if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
return false; /* read_callback_ sets the state for us */
obj->num_tracks = x;
if(obj->num_tracks > 0) {
if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
for(i = 0; i < obj->num_tracks; i++) {
FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
return false; /* read_callback_ sets the state for us */
track->number = (FLAC__byte)x;
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
return false; /* read_callback_ sets the state for us */
track->type = x;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
return false; /* read_callback_ sets the state for us */
track->pre_emphasis = x;
if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
return false; /* read_callback_ sets the state for us */
track->num_indices = (FLAC__byte)x;
if(track->num_indices > 0) {
if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
for(j = 0; j < track->num_indices; j++) {
FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j];
if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
return false; /* read_callback_ sets the state for us */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
return false; /* read_callback_ sets the state for us */
indx->number = (FLAC__byte)x;
if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
return false; /* read_callback_ sets the state for us */
}
}
}
}
return true;
}
FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
{
FLAC__uint32 x;
/* read type */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
return false; /* read_callback_ sets the state for us */
obj->type = x;
/* read MIME type */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
return false; /* read_callback_ sets the state for us */
if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
if(x > 0) {
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
return false; /* read_callback_ sets the state for us */
}
obj->mime_type[x] = '\0';
/* read description */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
return false; /* read_callback_ sets the state for us */
if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
if(x > 0) {
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
return false; /* read_callback_ sets the state for us */
}
obj->description[x] = '\0';
/* read width */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
return false; /* read_callback_ sets the state for us */
/* read height */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
return false; /* read_callback_ sets the state for us */
/* read depth */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
return false; /* read_callback_ sets the state for us */
/* read colors */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
return false; /* read_callback_ sets the state for us */
/* read data */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
return false; /* read_callback_ sets the state for us */
if(0 == (obj->data = safe_malloc_(obj->data_length))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
if(obj->data_length > 0) {
if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
return false; /* read_callback_ sets the state for us */
}
return true;
}
FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
{
FLAC__uint32 x;
uint32_t i, skip;
/* skip the version and flags bytes */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
return false; /* read_callback_ sets the state for us */
/* get the size (in bytes) to skip */
skip = 0;
for(i = 0; i < 4; i++) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
skip <<= 7;
skip |= (x & 0x7f);
}
/* skip the rest of the tag */
if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
return false; /* read_callback_ sets the state for us */
return true;
}
FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
{
FLAC__uint32 x;
FLAC__bool first = true;
/* If we know the total number of samples in the stream, stop if we've read that many. */
/* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
return true;
}
}
/* make sure we're byte aligned */
if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
return false; /* read_callback_ sets the state for us */
}
while(1) {
if(decoder->private_->cached) {
x = (FLAC__uint32)decoder->private_->lookahead;
decoder->private_->cached = false;
}
else {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
}
if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
decoder->private_->header_warmup[0] = (FLAC__byte)x;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
/* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
/* else we have to check if the second byte is the end of a sync code */
if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
decoder->private_->lookahead = (FLAC__byte)x;
decoder->private_->cached = true;
}
else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */
decoder->private_->header_warmup[1] = (FLAC__byte)x;
decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
return true;
}
}
if(first) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
first = false;
}
}
return true;
}
FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
{
uint32_t channel;
uint32_t i;
FLAC__int32 mid, side;
uint32_t frame_crc; /* the one we calculate from the input stream */
FLAC__uint32 x;
*got_a_frame = false;
/* init the CRC */
frame_crc = 0;
frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
if(!read_frame_header_(decoder))
return false;
if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
return true;
if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
return false;
for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
/*
* first figure the correct bits-per-sample of the subframe
*/
uint32_t bps = decoder->private_->frame.header.bits_per_sample;
switch(decoder->private_->frame.header.channel_assignment) {
case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
/* no adjustment needed */
break;
case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
if(channel == 1)
bps++;
break;
case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
if(channel == 0)
bps++;
break;
case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
if(channel == 1)
bps++;
break;
default: break;
}
/*
* now read it
*/
if(!read_subframe_(decoder, channel, bps, do_full_decode))
return false;
if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
return true;
}
if(!read_zero_padding_(decoder))
return false;
if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */
return true;
/*
* Read the frame CRC-16 from the footer and check
*/
frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
return false; /* read_callback_ sets the state for us */
if(frame_crc == x) {
if(do_full_decode) {
/* Undo any special channel coding */
switch(decoder->private_->frame.header.channel_assignment) {
case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
/* do nothing */
break;
case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
break;
case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
decoder->private_->output[0][i] += decoder->private_->output[1][i];
break;
case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
mid = decoder->private_->output[0][i];
side = decoder->private_->output[1][i];
mid = ((uint32_t) mid) << 1;
mid |= (side & 1); /* i.e. if 'side' is odd... */
decoder->private_->output[0][i] = (mid + side) >> 1;
decoder->private_->output[1][i] = (mid - side) >> 1;
}
break;
default: break;
}
}
}
else {
/* Bad frame, emit error and zero the output signal */
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
if(do_full_decode) {
for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
}
}
}
*got_a_frame = true;
/* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
if(decoder->private_->next_fixed_block_size)
decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
/* put the latest values into the public section of the decoder instance */
decoder->protected_->channels = decoder->private_->frame.header.channels;
decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
/* write it */
if(do_full_decode) {
if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) {
decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
return false;
}
}
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
{
FLAC__uint32 x;
FLAC__uint64 xx;
uint32_t i, blocksize_hint = 0, sample_rate_hint = 0;
FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
uint32_t raw_header_len;
FLAC__bool is_unparseable = false;
/* init the raw header with the saved bits from synchronization */
raw_header[0] = decoder->private_->header_warmup[0];
raw_header[1] = decoder->private_->header_warmup[1];
raw_header_len = 2;
/* check to make sure that reserved bit is 0 */
if(raw_header[1] & 0x02) /* MAGIC NUMBER */
is_unparseable = true;
/*
* Note that along the way as we read the header, we look for a sync
* code inside. If we find one it would indicate that our original
* sync was bad since there cannot be a sync code in a valid header.
*
* Three kinds of things can go wrong when reading the frame header:
* 1) We may have sync'ed incorrectly and not landed on a frame header.
* If we don't find a sync code, it can end up looking like we read
* a valid but unparseable header, until getting to the frame header
* CRC. Even then we could get a false positive on the CRC.
* 2) We may have sync'ed correctly but on an unparseable frame (from a
* future encoder).
* 3) We may be on a damaged frame which appears valid but unparseable.
*
* For all these reasons, we try and read a complete frame header as
* long as it seems valid, even if unparseable, up until the frame
* header CRC.
*/
/*
* read in the raw header as bytes so we can CRC it, and parse it on the way
*/
for(i = 0; i < 2; i++) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
/* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
decoder->private_->lookahead = (FLAC__byte)x;
decoder->private_->cached = true;
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
raw_header[raw_header_len++] = (FLAC__byte)x;
}
switch(x = raw_header[2] >> 4) {
case 0:
is_unparseable = true;
break;
case 1:
decoder->private_->frame.header.blocksize = 192;
break;
case 2:
case 3:
case 4:
case 5:
decoder->private_->frame.header.blocksize = 576 << (x-2);
break;
case 6:
case 7:
blocksize_hint = x;
break;
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
decoder->private_->frame.header.blocksize = 256 << (x-8);
break;
default:
break;
}
switch(x = raw_header[2] & 0x0f) {
case 0:
if(decoder->private_->has_stream_info)
decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
else
is_unparseable = true;
break;
case 1:
decoder->private_->frame.header.sample_rate = 88200;
break;
case 2:
decoder->private_->frame.header.sample_rate = 176400;
break;
case 3:
decoder->private_->frame.header.sample_rate = 192000;
break;
case 4:
decoder->private_->frame.header.sample_rate = 8000;
break;
case 5:
decoder->private_->frame.header.sample_rate = 16000;
break;
case 6:
decoder->private_->frame.header.sample_rate = 22050;
break;
case 7:
decoder->private_->frame.header.sample_rate = 24000;
break;
case 8:
decoder->private_->frame.header.sample_rate = 32000;
break;
case 9:
decoder->private_->frame.header.sample_rate = 44100;
break;
case 10:
decoder->private_->frame.header.sample_rate = 48000;
break;
case 11:
decoder->private_->frame.header.sample_rate = 96000;
break;
case 12:
case 13:
case 14:
sample_rate_hint = x;
break;
case 15:
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
default:
break;
}
x = (uint32_t)(raw_header[3] >> 4);
if(x & 8) {
decoder->private_->frame.header.channels = 2;
switch(x & 7) {
case 0:
decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
break;
case 1:
decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
break;
case 2:
decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
break;
default:
is_unparseable = true;
break;
}
}
else {
decoder->private_->frame.header.channels = (uint32_t)x + 1;
decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
}
switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) {
case 0:
if(decoder->private_->has_stream_info)
decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
else
is_unparseable = true;
break;
case 1:
decoder->private_->frame.header.bits_per_sample = 8;
break;
case 2:
decoder->private_->frame.header.bits_per_sample = 12;
break;
case 4:
decoder->private_->frame.header.bits_per_sample = 16;
break;
case 5:
decoder->private_->frame.header.bits_per_sample = 20;
break;
case 6:
decoder->private_->frame.header.bits_per_sample = 24;
break;
case 3:
case 7:
is_unparseable = true;
break;
default:
break;
}
/* check to make sure that reserved bit is 0 */
if(raw_header[3] & 0x01) /* MAGIC NUMBER */
is_unparseable = true;
/* read the frame's starting sample number (or frame number as the case may be) */
if(
raw_header[1] & 0x01 ||
/*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
) { /* variable blocksize */
if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
return false; /* read_callback_ sets the state for us */
if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
decoder->private_->cached = true;
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
decoder->private_->frame.header.number.sample_number = xx;
}
else { /* fixed blocksize */
if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
return false; /* read_callback_ sets the state for us */
if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
decoder->private_->cached = true;
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
decoder->private_->frame.header.number.frame_number = x;
}
if(blocksize_hint) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
raw_header[raw_header_len++] = (FLAC__byte)x;
if(blocksize_hint == 7) {
FLAC__uint32 _x;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
return false; /* read_callback_ sets the state for us */
raw_header[raw_header_len++] = (FLAC__byte)_x;
x = (x << 8) | _x;
}
decoder->private_->frame.header.blocksize = x+1;
}
if(sample_rate_hint) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
raw_header[raw_header_len++] = (FLAC__byte)x;
if(sample_rate_hint != 12) {
FLAC__uint32 _x;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
return false; /* read_callback_ sets the state for us */
raw_header[raw_header_len++] = (FLAC__byte)_x;
x = (x << 8) | _x;
}
if(sample_rate_hint == 12)
decoder->private_->frame.header.sample_rate = x*1000;
else if(sample_rate_hint == 13)
decoder->private_->frame.header.sample_rate = x;
else
decoder->private_->frame.header.sample_rate = x*10;
}
/* read the CRC-8 byte */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
return false; /* read_callback_ sets the state for us */
crc8 = (FLAC__byte)x;
if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
/* calculate the sample number from the frame number if needed */
decoder->private_->next_fixed_block_size = 0;
if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
x = decoder->private_->frame.header.number.frame_number;
decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
if(decoder->private_->fixed_block_size)
decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
else if(decoder->private_->has_stream_info) {
if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
}
else
is_unparseable = true;
}
else if(x == 0) {
decoder->private_->frame.header.number.sample_number = 0;
decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
}
else {
/* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
}
}
if(is_unparseable) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
return true;
}
FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
{
FLAC__uint32 x;
FLAC__bool wasted_bits;
uint32_t i;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
return false; /* read_callback_ sets the state for us */
wasted_bits = (x & 1);
x &= 0xfe;
if(wasted_bits) {
uint32_t u;
if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
return false; /* read_callback_ sets the state for us */
decoder->private_->frame.subframes[channel].wasted_bits = u+1;
if (decoder->private_->frame.subframes[channel].wasted_bits >= bps)
return false;
bps -= decoder->private_->frame.subframes[channel].wasted_bits;
}
else
decoder->private_->frame.subframes[channel].wasted_bits = 0;
/*
* Lots of magic numbers here
*/
if(x & 0x80) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
else if(x == 0) {
if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
return false;
}
else if(x == 2) {
if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
return false;
}
else if(x < 16) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
else if(x <= 24) {
if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
return false;
if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
return true;
}
else if(x < 64) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
else {
if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
return false;
if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
return true;
}
if(wasted_bits && do_full_decode) {
x = decoder->private_->frame.subframes[channel].wasted_bits;
for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
uint32_t val = decoder->private_->output[channel][i];
decoder->private_->output[channel][i] = (val << x);
}
}
return true;
}
FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
{
FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
FLAC__int32 x;
uint32_t i;
FLAC__int32 *output = decoder->private_->output[channel];
decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
return false; /* read_callback_ sets the state for us */
subframe->value = x;
/* decode the subframe */
if(do_full_decode) {
for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
output[i] = x;
}
return true;
}
FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
{
FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
FLAC__int32 i32;
FLAC__uint32 u32;
uint32_t u;
decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
subframe->residual = decoder->private_->residual[channel];
subframe->order = order;
/* read warm-up samples */
for(u = 0; u < order; u++) {
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
return false; /* read_callback_ sets the state for us */
subframe->warmup[u] = i32;
}
/* read entropy coding method info */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
return false; /* read_callback_ sets the state for us */
subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
switch(subframe->entropy_coding_method.type) {
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
return false; /* read_callback_ sets the state for us */
if(decoder->private_->frame.header.blocksize >> u32 < order) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
subframe->entropy_coding_method.data.partitioned_rice.order = u32;
subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
break;
default:
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
/* read residual */
switch(subframe->entropy_coding_method.type) {
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
return false;
break;
default:
break;
}
/* decode the subframe */
if(do_full_decode) {
memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
}
return true;
}
FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode)
{
FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
FLAC__int32 i32;
FLAC__uint32 u32;
uint32_t u;
decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
subframe->residual = decoder->private_->residual[channel];
subframe->order = order;
/* read warm-up samples */
for(u = 0; u < order; u++) {
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
return false; /* read_callback_ sets the state for us */
subframe->warmup[u] = i32;
}
/* read qlp coeff precision */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
return false; /* read_callback_ sets the state for us */
if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
subframe->qlp_coeff_precision = u32+1;
/* read qlp shift */
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
return false; /* read_callback_ sets the state for us */
if(i32 < 0) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
subframe->quantization_level = i32;
/* read quantized lp coefficiencts */
for(u = 0; u < order; u++) {
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
return false; /* read_callback_ sets the state for us */
subframe->qlp_coeff[u] = i32;
}
/* read entropy coding method info */
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
return false; /* read_callback_ sets the state for us */
subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
switch(subframe->entropy_coding_method.type) {
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
return false; /* read_callback_ sets the state for us */
if(decoder->private_->frame.header.blocksize >> u32 < order) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
subframe->entropy_coding_method.data.partitioned_rice.order = u32;
subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
break;
default:
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
return true;
}
/* read residual */
switch(subframe->entropy_coding_method.type) {
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
return false;
break;
default:
break;
}
/* decode the subframe */
if(do_full_decode) {
memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
else
decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
else
decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
}
return true;
}
FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode)
{
FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
FLAC__int32 x, *residual = decoder->private_->residual[channel];
uint32_t i;
decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
subframe->data = residual;
for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
return false; /* read_callback_ sets the state for us */
residual[i] = x;
}
/* decode the subframe */
if(do_full_decode)
memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
return true;
}
FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
{
FLAC__uint32 rice_parameter;
int i;
uint32_t partition, sample, u;
const uint32_t partitions = 1u << partition_order;
const uint32_t partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) {
decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
return false;
}
sample = 0;
for(partition = 0; partition < partitions; partition++) {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
return false; /* read_callback_ sets the state for us */
partitioned_rice_contents->parameters[partition] = rice_parameter;
if(rice_parameter < pesc) {
partitioned_rice_contents->raw_bits[partition] = 0;
u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
return false; /* read_callback_ sets the state for us */
sample += u;
}
else {
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
return false; /* read_callback_ sets the state for us */
partitioned_rice_contents->raw_bits[partition] = rice_parameter;
for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
return false; /* read_callback_ sets the state for us */
residual[sample] = i;
}
}
}
return true;
}
FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
{
if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
FLAC__uint32 zero = 0;
if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
return false; /* read_callback_ sets the state for us */
if(zero != 0) {
send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
}
}
return true;
}
FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
{
FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
if(
decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
) {
*bytes = 0;
decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
return false;
}
else if(*bytes > 0) {
/* While seeking, it is possible for our seek to land in the
* middle of audio data that looks exactly like a frame header
* from a future version of an encoder. When that happens, our
* error callback will get an
* FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
* unparseable_frame_count. But there is a remote possibility
* that it is properly synced at such a "future-codec frame",
* so to make sure, we wait to see many "unparseable" errors in
* a row before bailing out.
*/
if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
return false;
}
else {
const FLAC__StreamDecoderReadStatus status =
decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
;
if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
return false;
}
else if(*bytes == 0) {
if(
status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
(
decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
)
) {
decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
return false;
}
else
return true;
}
else
return true;
}
}
else {
/* abort to avoid a deadlock */
decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
return false;
}
/* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
* for Ogg FLAC. This is because the ogg decoder aspect can lose sync
* and at the same time hit the end of the stream (for example, seeking
* to a point that is after the beginning of the last Ogg page). There
* is no way to report an Ogg sync loss through the callbacks (see note
* in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
* So to keep the decoder from stopping at this point we gate the call
* to the eof_callback and let the Ogg decoder aspect set the
* end-of-stream state when it is needed.
*/
}
FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
{
if(decoder->private_->is_seeking) {
FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
FLAC__uint64 target_sample = decoder->private_->target_sample;
decoder->private_->last_frame = *frame; /* save the frame */
if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
uint32_t delta = (uint32_t)(target_sample - this_frame_sample);
/* kick out of seek mode */
decoder->private_->is_seeking = false;
/* shift out the samples before target_sample */
if(delta > 0) {
uint32_t channel;
const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
for(channel = 0; channel < frame->header.channels; channel++)
newbuffer[channel] = buffer[channel] + delta;
decoder->private_->last_frame.header.blocksize -= delta;
decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
/* write the relevant samples */
return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
}
else {
/* write the relevant samples */
return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
}
}
else {
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
}
else {
/*
* If we never got STREAMINFO, turn off MD5 checking to save
* cycles since we don't have a sum to compare to anyway
*/
if(!decoder->private_->has_stream_info)
decoder->private_->do_md5_checking = false;
if(decoder->private_->do_md5_checking) {
if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
}
}
void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
{
if(!decoder->private_->is_seeking)
decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
decoder->private_->unparseable_frame_count++;
}
FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
{
FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
FLAC__int64 pos = -1;
int i;
uint32_t approx_bytes_per_frame;
FLAC__bool first_seek = true;
const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
/* take these from the current frame in case they've changed mid-stream */
uint32_t channels = FLAC__stream_decoder_get_channels(decoder);
uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
/* use values from stream info if we didn't decode a frame */
if(channels == 0)
channels = decoder->private_->stream_info.data.stream_info.channels;
if(bps == 0)
bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
/* we are just guessing here */
if(max_framesize > 0)
approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
/*
* Check if it's a known fixed-blocksize stream. Note that though
* the spec doesn't allow zeroes in the STREAMINFO block, we may
* never get a STREAMINFO block when decoding so the value of
* min_blocksize might be zero.
*/
else if(min_blocksize == max_blocksize && min_blocksize > 0) {
/* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */
approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
}
else
approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
/*
* First, we set an upper and lower bound on where in the
* stream we will search. For now we assume the worst case
* scenario, which is our best guess at the beginning of
* the first frame and end of the stream.
*/
lower_bound = first_frame_offset;
lower_bound_sample = 0;
upper_bound = stream_length;
upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
/*
* Now we refine the bounds if we have a seektable with
* suitable points. Note that according to the spec they
* must be ordered by ascending sample number.
*
* Note: to protect against invalid seek tables we will ignore points
* that have frame_samples==0 or sample_number>=total_samples
*/
if(seek_table) {
FLAC__uint64 new_lower_bound = lower_bound;
FLAC__uint64 new_upper_bound = upper_bound;
FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
/* find the closest seek point <= target_sample, if it exists */
for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
if(
seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
(total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
seek_table->points[i].sample_number <= target_sample
)
break;
}
if(i >= 0) { /* i.e. we found a suitable seek point... */
new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
new_lower_bound_sample = seek_table->points[i].sample_number;
}
/* find the closest seek point > target_sample, if it exists */
for(i = 0; i < (int)seek_table->num_points; i++) {
if(
seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
(total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
seek_table->points[i].sample_number > target_sample
)
break;
}
if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
new_upper_bound_sample = seek_table->points[i].sample_number;
}
/* final protection against unsorted seek tables; keep original values if bogus */
if(new_upper_bound >= new_lower_bound) {
lower_bound = new_lower_bound;
upper_bound = new_upper_bound;
lower_bound_sample = new_lower_bound_sample;
upper_bound_sample = new_upper_bound_sample;
}
}
/* there are 2 insidious ways that the following equality occurs, which
* we need to fix:
* 1) total_samples is 0 (unknown) and target_sample is 0
* 2) total_samples is 0 (unknown) and target_sample happens to be
* exactly equal to the last seek point in the seek table; this
* means there is no seek point above it, and upper_bound_samples
* remains equal to the estimate (of target_samples) we made above
* in either case it does not hurt to move upper_bound_sample up by 1
*/
if(upper_bound_sample == lower_bound_sample)
upper_bound_sample++;
decoder->private_->target_sample = target_sample;
while(1) {
/* check if the bounds are still ok */
if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
if(pos >= (FLAC__int64)upper_bound)
pos = (FLAC__int64)upper_bound - 1;
if(pos < (FLAC__int64)lower_bound)
pos = (FLAC__int64)lower_bound;
if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
if(!FLAC__stream_decoder_flush(decoder)) {
/* above call sets the state for us */
return false;
}
/* Now we need to get a frame. First we need to reset our
* unparseable_frame_count; if we get too many unparseable
* frames in a row, the read callback will return
* FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
* FLAC__stream_decoder_process_single() to return false.
*/
decoder->private_->unparseable_frame_count = 0;
if(!FLAC__stream_decoder_process_single(decoder) ||
decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
/* our write callback will change the state when it gets to the target frame */
/* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */
if(!decoder->private_->is_seeking)
break;
this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
if (pos == (FLAC__int64)lower_bound) {
/* can't move back any more than the first frame, something is fatally wrong */
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
/* our last move backwards wasn't big enough, try again */
approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
continue;
}
/* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
first_seek = false;
/* make sure we are not seeking in corrupted stream */
if (this_frame_sample < lower_bound_sample) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
/* we need to narrow the search */
if(target_sample < this_frame_sample) {
upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
/*@@@@@@ what will decode position be if at end of stream? */
if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
approx_bytes_per_frame = (uint32_t)(2 * (upper_bound - pos) / 3 + 16);
}
else { /* target_sample >= this_frame_sample + this frame's blocksize */
lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
return false;
}
approx_bytes_per_frame = (uint32_t)(2 * (lower_bound - pos) / 3 + 16);
}
}
return true;
}
FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
{
(void)client_data;
if(*bytes > 0) {
*bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
if(ferror(decoder->private_->file))
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
else if(*bytes == 0)
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
else
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
else
return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
}
FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
{
(void)client_data;
if(decoder->private_->file == stdin)
return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0)
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
else
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
FLAC__off_t pos;
(void)client_data;
if(decoder->private_->file == stdin)
return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
else if((pos = ftello(decoder->private_->file)) < 0)
return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
else {
*absolute_byte_offset = (FLAC__uint64)pos;
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
}
FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
{
struct flac_stat_s filestats;
(void)client_data;
if(decoder->private_->file == stdin)
return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0)
return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
else {
*stream_length = (FLAC__uint64)filestats.st_size;
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
}
FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
{
(void)client_data;
return feof(decoder->private_->file)? true : false;
}
void *get_client_data_from_decoder(FLAC__StreamDecoder *decoder)
{
return decoder->private_->client_data;
}