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FFmpeg/libavformat/matroskadec.c
Reimar Döffinger 95ec3d4cac matroskadec: add generic element length validation. 
This validate the length of a mkv element directly after reading
it.
This has the advantage that it is easy to add new limits and makes
it less likely to forget to add checks and also avoids issues like
bits of the length value above the first 32 being ignored because
the parsing functions only takes an int.
Previously discussed in the "mkv 0-byte integer parsing" thread.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
2011-02-06 21:36:53 -05:00

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/*
* Matroska file demuxer
* Copyright (c) 2003-2008 The FFmpeg Project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Matroska file demuxer
* by Ronald Bultje <rbultje@ronald.bitfreak.net>
* with a little help from Moritz Bunkus <moritz@bunkus.org>
* totally reworked by Aurelien Jacobs <aurel@gnuage.org>
* Specs available on the Matroska project page: http://www.matroska.org/.
*/
#include <stdio.h>
#include "avformat.h"
#include "internal.h"
/* For ff_codec_get_id(). */
#include "riff.h"
#include "isom.h"
#include "rm.h"
#include "matroska.h"
#include "libavcodec/mpeg4audio.h"
#include "libavutil/intfloat_readwrite.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/lzo.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#if CONFIG_BZLIB
#include <bzlib.h>
#endif
typedef enum {
EBML_NONE,
EBML_UINT,
EBML_FLOAT,
EBML_STR,
EBML_UTF8,
EBML_BIN,
EBML_NEST,
EBML_PASS,
EBML_STOP,
EBML_TYPE_COUNT
} EbmlType;
typedef const struct EbmlSyntax {
uint32_t id;
EbmlType type;
int list_elem_size;
int data_offset;
union {
uint64_t u;
double f;
const char *s;
const struct EbmlSyntax *n;
} def;
} EbmlSyntax;
typedef struct {
int nb_elem;
void *elem;
} EbmlList;
typedef struct {
int size;
uint8_t *data;
int64_t pos;
} EbmlBin;
typedef struct {
uint64_t version;
uint64_t max_size;
uint64_t id_length;
char *doctype;
uint64_t doctype_version;
} Ebml;
typedef struct {
uint64_t algo;
EbmlBin settings;
} MatroskaTrackCompression;
typedef struct {
uint64_t scope;
uint64_t type;
MatroskaTrackCompression compression;
} MatroskaTrackEncoding;
typedef struct {
double frame_rate;
uint64_t display_width;
uint64_t display_height;
uint64_t pixel_width;
uint64_t pixel_height;
uint64_t fourcc;
} MatroskaTrackVideo;
typedef struct {
double samplerate;
double out_samplerate;
uint64_t bitdepth;
uint64_t channels;
/* real audio header (extracted from extradata) */
int coded_framesize;
int sub_packet_h;
int frame_size;
int sub_packet_size;
int sub_packet_cnt;
int pkt_cnt;
uint8_t *buf;
} MatroskaTrackAudio;
typedef struct {
uint64_t num;
uint64_t uid;
uint64_t type;
char *name;
char *codec_id;
EbmlBin codec_priv;
char *language;
double time_scale;
uint64_t default_duration;
uint64_t flag_default;
uint64_t flag_forced;
MatroskaTrackVideo video;
MatroskaTrackAudio audio;
EbmlList encodings;
AVStream *stream;
int64_t end_timecode;
int ms_compat;
} MatroskaTrack;
typedef struct {
uint64_t uid;
char *filename;
char *mime;
EbmlBin bin;
AVStream *stream;
} MatroskaAttachement;
typedef struct {
uint64_t start;
uint64_t end;
uint64_t uid;
char *title;
AVChapter *chapter;
} MatroskaChapter;
typedef struct {
uint64_t track;
uint64_t pos;
} MatroskaIndexPos;
typedef struct {
uint64_t time;
EbmlList pos;
} MatroskaIndex;
typedef struct {
char *name;
char *string;
char *lang;
uint64_t def;
EbmlList sub;
} MatroskaTag;
typedef struct {
char *type;
uint64_t typevalue;
uint64_t trackuid;
uint64_t chapteruid;
uint64_t attachuid;
} MatroskaTagTarget;
typedef struct {
MatroskaTagTarget target;
EbmlList tag;
} MatroskaTags;
typedef struct {
uint64_t id;
uint64_t pos;
} MatroskaSeekhead;
typedef struct {
uint64_t start;
uint64_t length;
} MatroskaLevel;
typedef struct {
AVFormatContext *ctx;
/* EBML stuff */
int num_levels;
MatroskaLevel levels[EBML_MAX_DEPTH];
int level_up;
uint32_t current_id;
uint64_t time_scale;
double duration;
char *title;
EbmlList tracks;
EbmlList attachments;
EbmlList chapters;
EbmlList index;
EbmlList tags;
EbmlList seekhead;
/* byte position of the segment inside the stream */
int64_t segment_start;
/* the packet queue */
AVPacket **packets;
int num_packets;
AVPacket *prev_pkt;
int done;
/* What to skip before effectively reading a packet. */
int skip_to_keyframe;
uint64_t skip_to_timecode;
} MatroskaDemuxContext;
typedef struct {
uint64_t duration;
int64_t reference;
uint64_t non_simple;
EbmlBin bin;
} MatroskaBlock;
typedef struct {
uint64_t timecode;
EbmlList blocks;
} MatroskaCluster;
static EbmlSyntax ebml_header[] = {
{ EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
{ EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
{ EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
{ EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
{ EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
{ EBML_ID_EBMLVERSION, EBML_NONE },
{ EBML_ID_DOCTYPEVERSION, EBML_NONE },
{ 0 }
};
static EbmlSyntax ebml_syntax[] = {
{ EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
{ 0 }
};
static EbmlSyntax matroska_info[] = {
{ MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
{ MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
{ MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
{ MATROSKA_ID_WRITINGAPP, EBML_NONE },
{ MATROSKA_ID_MUXINGAPP, EBML_NONE },
{ MATROSKA_ID_DATEUTC, EBML_NONE },
{ MATROSKA_ID_SEGMENTUID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_video[] = {
{ MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
{ MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
{ MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
{ MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
{ MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
{ MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
{ MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
{ MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
{ MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
{ MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
{ MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_audio[] = {
{ MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
{ MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
{ MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
{ MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
{ 0 }
};
static EbmlSyntax matroska_track_encoding_compression[] = {
{ MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
{ MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
{ 0 }
};
static EbmlSyntax matroska_track_encoding[] = {
{ MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
{ MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
{ MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
{ MATROSKA_ID_ENCODINGORDER, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_encodings[] = {
{ MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
{ 0 }
};
static EbmlSyntax matroska_track[] = {
{ MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
{ MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
{ MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
{ MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
{ MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
{ MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
{ MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
{ MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
{ MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
{ MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
{ MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
{ MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
{ MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
{ MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
{ MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
{ MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
{ MATROSKA_ID_CODECNAME, EBML_NONE },
{ MATROSKA_ID_CODECDECODEALL, EBML_NONE },
{ MATROSKA_ID_CODECINFOURL, EBML_NONE },
{ MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
{ MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
{ MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
{ MATROSKA_ID_TRACKMAXBLKADDID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_tracks[] = {
{ MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
{ 0 }
};
static EbmlSyntax matroska_attachment[] = {
{ MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
{ MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
{ MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
{ MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
{ MATROSKA_ID_FILEDESC, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_attachments[] = {
{ MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
{ 0 }
};
static EbmlSyntax matroska_chapter_display[] = {
{ MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
{ MATROSKA_ID_CHAPLANG, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter_entry[] = {
{ MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
{ MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
{ MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
{ MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
{ MATROSKA_ID_CHAPTERATOM, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter[] = {
{ MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
{ MATROSKA_ID_EDITIONUID, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapters[] = {
{ MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
{ 0 }
};
static EbmlSyntax matroska_index_pos[] = {
{ MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
{ MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
{ MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_index_entry[] = {
{ MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
{ MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
{ 0 }
};
static EbmlSyntax matroska_index[] = {
{ MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
{ 0 }
};
static EbmlSyntax matroska_simpletag[] = {
{ MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag,name) },
{ MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag,string) },
{ MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag,lang), {.s="und"} },
{ MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag,def) },
{ MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag,def) },
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
{ 0 }
};
static EbmlSyntax matroska_tagtargets[] = {
{ MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget,type) },
{ MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
{ MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
{ MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
{ MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
{ 0 }
};
static EbmlSyntax matroska_tag[] = {
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
{ MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
{ 0 }
};
static EbmlSyntax matroska_tags[] = {
{ MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
{ 0 }
};
static EbmlSyntax matroska_seekhead_entry[] = {
{ MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
{ MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
{ 0 }
};
static EbmlSyntax matroska_seekhead[] = {
{ MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
{ 0 }
};
static EbmlSyntax matroska_segment[] = {
{ MATROSKA_ID_INFO, EBML_NEST, 0, 0, {.n=matroska_info } },
{ MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, {.n=matroska_tracks } },
{ MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, {.n=matroska_attachments} },
{ MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, {.n=matroska_chapters } },
{ MATROSKA_ID_CUES, EBML_NEST, 0, 0, {.n=matroska_index } },
{ MATROSKA_ID_TAGS, EBML_NEST, 0, 0, {.n=matroska_tags } },
{ MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, {.n=matroska_seekhead } },
{ MATROSKA_ID_CLUSTER, EBML_STOP },
{ 0 }
};
static EbmlSyntax matroska_segments[] = {
{ MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, {.n=matroska_segment } },
{ 0 }
};
static EbmlSyntax matroska_blockgroup[] = {
{ MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
{ MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
{ 1, EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
{ 0 }
};
static EbmlSyntax matroska_cluster[] = {
{ MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
{ MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
{ MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
{ MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_clusters[] = {
{ MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster} },
{ MATROSKA_ID_INFO, EBML_NONE },
{ MATROSKA_ID_CUES, EBML_NONE },
{ MATROSKA_ID_TAGS, EBML_NONE },
{ MATROSKA_ID_SEEKHEAD, EBML_NONE },
{ 0 }
};
static const char *matroska_doctypes[] = { "matroska", "webm" };
/*
* Return: Whether we reached the end of a level in the hierarchy or not.
*/
static int ebml_level_end(MatroskaDemuxContext *matroska)
{
ByteIOContext *pb = matroska->ctx->pb;
int64_t pos = url_ftell(pb);
if (matroska->num_levels > 0) {
MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
if (pos - level->start >= level->length || matroska->current_id) {
matroska->num_levels--;
return 1;
}
}
return 0;
}
/*
* Read: an "EBML number", which is defined as a variable-length
* array of bytes. The first byte indicates the length by giving a
* number of 0-bits followed by a one. The position of the first
* "one" bit inside the first byte indicates the length of this
* number.
* Returns: number of bytes read, < 0 on error
*/
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
int max_size, uint64_t *number)
{
int read = 1, n = 1;
uint64_t total = 0;
/* The first byte tells us the length in bytes - get_byte() can normally
* return 0, but since that's not a valid first ebmlID byte, we can
* use it safely here to catch EOS. */
if (!(total = get_byte(pb))) {
/* we might encounter EOS here */
if (!url_feof(pb)) {
int64_t pos = url_ftell(pb);
av_log(matroska->ctx, AV_LOG_ERROR,
"Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
pos, pos);
}
return AVERROR(EIO); /* EOS or actual I/O error */
}
/* get the length of the EBML number */
read = 8 - ff_log2_tab[total];
if (read > max_size) {
int64_t pos = url_ftell(pb) - 1;
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
(uint8_t) total, pos, pos);
return AVERROR_INVALIDDATA;
}
/* read out length */
total ^= 1 << ff_log2_tab[total];
while (n++ < read)
total = (total << 8) | get_byte(pb);
*number = total;
return read;
}
/**
* Read a EBML length value.
* This needs special handling for the "unknown length" case which has multiple
* encodings.
*/
static int ebml_read_length(MatroskaDemuxContext *matroska, ByteIOContext *pb,
uint64_t *number)
{
int res = ebml_read_num(matroska, pb, 8, number);
if (res > 0 && *number + 1 == 1ULL << (7 * res))
*number = 0xffffffffffffffULL;
return res;
}
/*
* Read the next element as an unsigned int.
* 0 is success, < 0 is failure.
*/
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
{
int n = 0;
if (size > 8)
return AVERROR_INVALIDDATA;
/* big-endian ordering; build up number */
*num = 0;
while (n++ < size)
*num = (*num << 8) | get_byte(pb);
return 0;
}
/*
* Read the next element as a float.
* 0 is success, < 0 is failure.
*/
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
{
if (size == 0) {
*num = 0;
} else if (size == 4) {
*num= av_int2flt(get_be32(pb));
} else if(size==8){
*num= av_int2dbl(get_be64(pb));
} else
return AVERROR_INVALIDDATA;
return 0;
}
/*
* Read the next element as an ASCII string.
* 0 is success, < 0 is failure.
*/
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
{
av_free(*str);
/* EBML strings are usually not 0-terminated, so we allocate one
* byte more, read the string and NULL-terminate it ourselves. */
if (!(*str = av_malloc(size + 1)))
return AVERROR(ENOMEM);
if (get_buffer(pb, (uint8_t *) *str, size) != size) {
av_freep(str);
return AVERROR(EIO);
}
(*str)[size] = '\0';
return 0;
}
/*
* Read the next element as binary data.
* 0 is success, < 0 is failure.
*/
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
{
av_free(bin->data);
if (!(bin->data = av_malloc(length)))
return AVERROR(ENOMEM);
bin->size = length;
bin->pos = url_ftell(pb);
if (get_buffer(pb, bin->data, length) != length) {
av_freep(&bin->data);
return AVERROR(EIO);
}
return 0;
}
/*
* Read the next element, but only the header. The contents
* are supposed to be sub-elements which can be read separately.
* 0 is success, < 0 is failure.
*/
static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
{
ByteIOContext *pb = matroska->ctx->pb;
MatroskaLevel *level;
if (matroska->num_levels >= EBML_MAX_DEPTH) {
av_log(matroska->ctx, AV_LOG_ERROR,
"File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
return AVERROR(ENOSYS);
}
level = &matroska->levels[matroska->num_levels++];
level->start = url_ftell(pb);
level->length = length;
return 0;
}
/*
* Read signed/unsigned "EBML" numbers.
* Return: number of bytes processed, < 0 on error
*/
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
uint8_t *data, uint32_t size, uint64_t *num)
{
ByteIOContext pb;
init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
}
/*
* Same as above, but signed.
*/
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
uint8_t *data, uint32_t size, int64_t *num)
{
uint64_t unum;
int res;
/* read as unsigned number first */
if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
return res;
/* make signed (weird way) */
*num = unum - ((1LL << (7*res - 1)) - 1);
return res;
}
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
EbmlSyntax *syntax, void *data);
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
uint32_t id, void *data)
{
int i;
for (i=0; syntax[i].id; i++)
if (id == syntax[i].id)
break;
if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
matroska->num_levels > 0 &&
matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
return 0; // we reached the end of an unknown size cluster
if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
return ebml_parse_elem(matroska, &syntax[i], data);
}
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
void *data)
{
if (!matroska->current_id) {
uint64_t id;
int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
if (res < 0)
return res;
matroska->current_id = id | 1 << 7*res;
}
return ebml_parse_id(matroska, syntax, matroska->current_id, data);
}
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
void *data)
{
int i, res = 0;
for (i=0; syntax[i].id; i++)
switch (syntax[i].type) {
case EBML_UINT:
*(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
break;
case EBML_FLOAT:
*(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
break;
case EBML_STR:
case EBML_UTF8:
*(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
break;
}
while (!res && !ebml_level_end(matroska))
res = ebml_parse(matroska, syntax, data);
return res;
}
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
EbmlSyntax *syntax, void *data)
{
static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
[EBML_UINT] = 8,
[EBML_FLOAT] = 8,
// max. 16 MB for strings
[EBML_STR] = 0x1000000,
[EBML_UTF8] = 0x1000000,
// max. 256 MB for binary data
[EBML_BIN] = 0x10000000,
// no limits for anything else
};
ByteIOContext *pb = matroska->ctx->pb;
uint32_t id = syntax->id;
uint64_t length;
int res;
data = (char *)data + syntax->data_offset;
if (syntax->list_elem_size) {
EbmlList *list = data;
list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
memset(data, 0, syntax->list_elem_size);
list->nb_elem++;
}
if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
matroska->current_id = 0;
if ((res = ebml_read_length(matroska, pb, &length)) < 0)
return res;
if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
length, max_lengths[syntax->type], syntax->type);
return AVERROR_INVALIDDATA;
}
}
switch (syntax->type) {
case EBML_UINT: res = ebml_read_uint (pb, length, data); break;
case EBML_FLOAT: res = ebml_read_float (pb, length, data); break;
case EBML_STR:
case EBML_UTF8: res = ebml_read_ascii (pb, length, data); break;
case EBML_BIN: res = ebml_read_binary(pb, length, data); break;
case EBML_NEST: if ((res=ebml_read_master(matroska, length)) < 0)
return res;
if (id == MATROSKA_ID_SEGMENT)
matroska->segment_start = url_ftell(matroska->ctx->pb);
return ebml_parse_nest(matroska, syntax->def.n, data);
case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data);
case EBML_STOP: return 1;
default: return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
}
if (res == AVERROR_INVALIDDATA)
av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
else if (res == AVERROR(EIO))
av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
return res;
}
static void ebml_free(EbmlSyntax *syntax, void *data)
{
int i, j;
for (i=0; syntax[i].id; i++) {
void *data_off = (char *)data + syntax[i].data_offset;
switch (syntax[i].type) {
case EBML_STR:
case EBML_UTF8: av_freep(data_off); break;
case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
case EBML_NEST:
if (syntax[i].list_elem_size) {
EbmlList *list = data_off;
char *ptr = list->elem;
for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
ebml_free(syntax[i].def.n, ptr);
av_free(list->elem);
} else
ebml_free(syntax[i].def.n, data_off);
default: break;
}
}
}
/*
* Autodetecting...
*/
static int matroska_probe(AVProbeData *p)
{
uint64_t total = 0;
int len_mask = 0x80, size = 1, n = 1, i;
/* EBML header? */
if (AV_RB32(p->buf) != EBML_ID_HEADER)
return 0;
/* length of header */
total = p->buf[4];
while (size <= 8 && !(total & len_mask)) {
size++;
len_mask >>= 1;
}
if (size > 8)
return 0;
total &= (len_mask - 1);
while (n < size)
total = (total << 8) | p->buf[4 + n++];
/* Does the probe data contain the whole header? */
if (p->buf_size < 4 + size + total)
return 0;
/* The header should contain a known document type. For now,
* we don't parse the whole header but simply check for the
* availability of that array of characters inside the header.
* Not fully fool-proof, but good enough. */
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
int probelen = strlen(matroska_doctypes[i]);
for (n = 4+size; n <= 4+size+total-probelen; n++)
if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
return AVPROBE_SCORE_MAX;
}
// probably valid EBML header but no recognized doctype
return AVPROBE_SCORE_MAX/2;
}
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
int num)
{
MatroskaTrack *tracks = matroska->tracks.elem;
int i;
for (i=0; i < matroska->tracks.nb_elem; i++)
if (tracks[i].num == num)
return &tracks[i];
av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
return NULL;
}
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
MatroskaTrack *track)
{
MatroskaTrackEncoding *encodings = track->encodings.elem;
uint8_t* data = *buf;
int isize = *buf_size;
uint8_t* pkt_data = NULL;
int pkt_size = isize;
int result = 0;
int olen;
if (pkt_size >= 10000000)
return -1;
switch (encodings[0].compression.algo) {
case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
return encodings[0].compression.settings.size;
case MATROSKA_TRACK_ENCODING_COMP_LZO:
do {
olen = pkt_size *= 3;
pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
} while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
if (result)
goto failed;
pkt_size -= olen;
break;
#if CONFIG_ZLIB
case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
z_stream zstream = {0};
if (inflateInit(&zstream) != Z_OK)
return -1;
zstream.next_in = data;
zstream.avail_in = isize;
do {
pkt_size *= 3;
pkt_data = av_realloc(pkt_data, pkt_size);
zstream.avail_out = pkt_size - zstream.total_out;
zstream.next_out = pkt_data + zstream.total_out;
result = inflate(&zstream, Z_NO_FLUSH);
} while (result==Z_OK && pkt_size<10000000);
pkt_size = zstream.total_out;
inflateEnd(&zstream);
if (result != Z_STREAM_END)
goto failed;
break;
}
#endif
#if CONFIG_BZLIB
case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
bz_stream bzstream = {0};
if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
return -1;
bzstream.next_in = data;
bzstream.avail_in = isize;
do {
pkt_size *= 3;
pkt_data = av_realloc(pkt_data, pkt_size);
bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
bzstream.next_out = pkt_data + bzstream.total_out_lo32;
result = BZ2_bzDecompress(&bzstream);
} while (result==BZ_OK && pkt_size<10000000);
pkt_size = bzstream.total_out_lo32;
BZ2_bzDecompressEnd(&bzstream);
if (result != BZ_STREAM_END)
goto failed;
break;
}
#endif
default:
return -1;
}
*buf = pkt_data;
*buf_size = pkt_size;
return 0;
failed:
av_free(pkt_data);
return -1;
}
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
AVPacket *pkt, uint64_t display_duration)
{
char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
for (; *ptr!=',' && ptr<end-1; ptr++);
if (*ptr == ',')
layer = ++ptr;
for (; *ptr!=',' && ptr<end-1; ptr++);
if (*ptr == ',') {
int64_t end_pts = pkt->pts + display_duration;
int sc = matroska->time_scale * pkt->pts / 10000000;
int ec = matroska->time_scale * end_pts / 10000000;
int sh, sm, ss, eh, em, es, len;
sh = sc/360000; sc -= 360000*sh;
sm = sc/ 6000; sc -= 6000*sm;
ss = sc/ 100; sc -= 100*ss;
eh = ec/360000; ec -= 360000*eh;
em = ec/ 6000; ec -= 6000*em;
es = ec/ 100; ec -= 100*es;
*ptr++ = '\0';
len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
if (!(line = av_malloc(len)))
return;
snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
av_free(pkt->data);
pkt->data = line;
pkt->size = strlen(line);
}
}
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
{
out->data = av_realloc(out->data, out->size+in->size);
memcpy(out->data+out->size, in->data, in->size);
out->size += in->size;
av_destruct_packet(in);
av_free(in);
}
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
AVMetadata **metadata, char *prefix)
{
MatroskaTag *tags = list->elem;
char key[1024];
int i;
for (i=0; i < list->nb_elem; i++) {
const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
if (!tags[i].name) {
av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
continue;
}
if (prefix) snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
else av_strlcpy(key, tags[i].name, sizeof(key));
if (tags[i].def || !lang) {
av_metadata_set2(metadata, key, tags[i].string, 0);
if (tags[i].sub.nb_elem)
matroska_convert_tag(s, &tags[i].sub, metadata, key);
}
if (lang) {
av_strlcat(key, "-", sizeof(key));
av_strlcat(key, lang, sizeof(key));
av_metadata_set2(metadata, key, tags[i].string, 0);
if (tags[i].sub.nb_elem)
matroska_convert_tag(s, &tags[i].sub, metadata, key);
}
}
ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
}
static void matroska_convert_tags(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTags *tags = matroska->tags.elem;
int i, j;
for (i=0; i < matroska->tags.nb_elem; i++) {
if (tags[i].target.attachuid) {
MatroskaAttachement *attachment = matroska->attachments.elem;
for (j=0; j<matroska->attachments.nb_elem; j++)
if (attachment[j].uid == tags[i].target.attachuid)
matroska_convert_tag(s, &tags[i].tag,
&attachment[j].stream->metadata, NULL);
} else if (tags[i].target.chapteruid) {
MatroskaChapter *chapter = matroska->chapters.elem;
for (j=0; j<matroska->chapters.nb_elem; j++)
if (chapter[j].uid == tags[i].target.chapteruid)
matroska_convert_tag(s, &tags[i].tag,
&chapter[j].chapter->metadata, NULL);
} else if (tags[i].target.trackuid) {
MatroskaTrack *track = matroska->tracks.elem;
for (j=0; j<matroska->tracks.nb_elem; j++)
if (track[j].uid == tags[i].target.trackuid)
matroska_convert_tag(s, &tags[i].tag,
&track[j].stream->metadata, NULL);
} else {
matroska_convert_tag(s, &tags[i].tag, &s->metadata,
tags[i].target.type);
}
}
}
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
EbmlList *seekhead_list = &matroska->seekhead;
MatroskaSeekhead *seekhead = seekhead_list->elem;
uint32_t level_up = matroska->level_up;
int64_t before_pos = url_ftell(matroska->ctx->pb);
uint32_t saved_id = matroska->current_id;
MatroskaLevel level;
int i;
// we should not do any seeking in the streaming case
if (url_is_streamed(matroska->ctx->pb) ||
(matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
return;
for (i=0; i<seekhead_list->nb_elem; i++) {
int64_t offset = seekhead[i].pos + matroska->segment_start;
if (seekhead[i].pos <= before_pos
|| seekhead[i].id == MATROSKA_ID_SEEKHEAD
|| seekhead[i].id == MATROSKA_ID_CLUSTER)
continue;
/* seek */
if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
continue;
/* We don't want to lose our seekhead level, so we add
* a dummy. This is a crude hack. */
if (matroska->num_levels == EBML_MAX_DEPTH) {
av_log(matroska->ctx, AV_LOG_INFO,
"Max EBML element depth (%d) reached, "
"cannot parse further.\n", EBML_MAX_DEPTH);
break;
}
level.start = 0;
level.length = (uint64_t)-1;
matroska->levels[matroska->num_levels] = level;
matroska->num_levels++;
matroska->current_id = 0;
ebml_parse(matroska, matroska_segment, matroska);
/* remove dummy level */
while (matroska->num_levels) {
uint64_t length = matroska->levels[--matroska->num_levels].length;
if (length == (uint64_t)-1)
break;
}
}
/* seek back */
url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
matroska->level_up = level_up;
matroska->current_id = saved_id;
}
static int matroska_aac_profile(char *codec_id)
{
static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
int profile;
for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
if (strstr(codec_id, aac_profiles[profile]))
break;
return profile + 1;
}
static int matroska_aac_sri(int samplerate)
{
int sri;
for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
if (ff_mpeg4audio_sample_rates[sri] == samplerate)
break;
return sri;
}
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MatroskaDemuxContext *matroska = s->priv_data;
EbmlList *attachements_list = &matroska->attachments;
MatroskaAttachement *attachements;
EbmlList *chapters_list = &matroska->chapters;
MatroskaChapter *chapters;
MatroskaTrack *tracks;
EbmlList *index_list;
MatroskaIndex *index;
int index_scale = 1;
uint64_t max_start = 0;
Ebml ebml = { 0 };
AVStream *st;
int i, j, res;
matroska->ctx = s;
/* First read the EBML header. */
if (ebml_parse(matroska, ebml_syntax, &ebml)
|| ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
|| ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
av_log(matroska->ctx, AV_LOG_ERROR,
"EBML header using unsupported features\n"
"(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
ebml.version, ebml.doctype, ebml.doctype_version);
ebml_free(ebml_syntax, &ebml);
return AVERROR_PATCHWELCOME;
}
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
if (!strcmp(ebml.doctype, matroska_doctypes[i]))
break;
if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
}
ebml_free(ebml_syntax, &ebml);
/* The next thing is a segment. */
if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
return res;
matroska_execute_seekhead(matroska);
if (!matroska->time_scale)
matroska->time_scale = 1000000;
if (matroska->duration)
matroska->ctx->duration = matroska->duration * matroska->time_scale
* 1000 / AV_TIME_BASE;
av_metadata_set2(&s->metadata, "title", matroska->title, 0);
tracks = matroska->tracks.elem;
for (i=0; i < matroska->tracks.nb_elem; i++) {
MatroskaTrack *track = &tracks[i];
enum CodecID codec_id = CODEC_ID_NONE;
EbmlList *encodings_list = &tracks->encodings;
MatroskaTrackEncoding *encodings = encodings_list->elem;
uint8_t *extradata = NULL;
int extradata_size = 0;
int extradata_offset = 0;
ByteIOContext b;
/* Apply some sanity checks. */
if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
track->type != MATROSKA_TRACK_TYPE_AUDIO &&
track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown or unsupported track type %"PRIu64"\n",
track->type);
continue;
}
if (track->codec_id == NULL)
continue;
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
if (!track->default_duration)
track->default_duration = 1000000000/track->video.frame_rate;
if (!track->video.display_width)
track->video.display_width = track->video.pixel_width;
if (!track->video.display_height)
track->video.display_height = track->video.pixel_height;
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
if (!track->audio.out_samplerate)
track->audio.out_samplerate = track->audio.samplerate;
}
if (encodings_list->nb_elem > 1) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Multiple combined encodings no supported");
} else if (encodings_list->nb_elem == 1) {
if (encodings[0].type ||
(encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
#if CONFIG_ZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
#endif
#if CONFIG_BZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
#endif
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
encodings[0].scope = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Unsupported encoding type");
} else if (track->codec_priv.size && encodings[0].scope&2) {
uint8_t *codec_priv = track->codec_priv.data;
int offset = matroska_decode_buffer(&track->codec_priv.data,
&track->codec_priv.size,
track);
if (offset < 0) {
track->codec_priv.data = NULL;
track->codec_priv.size = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Failed to decode codec private data\n");
} else if (offset > 0) {
track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
memcpy(track->codec_priv.data,
encodings[0].compression.settings.data, offset);
memcpy(track->codec_priv.data+offset, codec_priv,
track->codec_priv.size);
track->codec_priv.size += offset;
}
if (codec_priv != track->codec_priv.data)
av_free(codec_priv);
}
}
for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
strlen(ff_mkv_codec_tags[j].str))){
codec_id= ff_mkv_codec_tags[j].id;
break;
}
}
st = track->stream = av_new_stream(s, 0);
if (st == NULL)
return AVERROR(ENOMEM);
if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
&& track->codec_priv.size >= 40
&& track->codec_priv.data != NULL) {
track->ms_compat = 1;
track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
extradata_offset = 40;
} else if (!strcmp(track->codec_id, "A_MS/ACM")
&& track->codec_priv.size >= 14
&& track->codec_priv.data != NULL) {
init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
URL_RDONLY, NULL, NULL, NULL, NULL);
ff_get_wav_header(&b, st->codec, track->codec_priv.size);
codec_id = st->codec->codec_id;
extradata_offset = FFMIN(track->codec_priv.size, 18);
} else if (!strcmp(track->codec_id, "V_QUICKTIME")
&& (track->codec_priv.size >= 86)
&& (track->codec_priv.data != NULL)) {
track->video.fourcc = AV_RL32(track->codec_priv.data);
codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
} else if (codec_id == CODEC_ID_PCM_S16BE) {
switch (track->audio.bitdepth) {
case 8: codec_id = CODEC_ID_PCM_U8; break;
case 24: codec_id = CODEC_ID_PCM_S24BE; break;
case 32: codec_id = CODEC_ID_PCM_S32BE; break;
}
} else if (codec_id == CODEC_ID_PCM_S16LE) {
switch (track->audio.bitdepth) {
case 8: codec_id = CODEC_ID_PCM_U8; break;
case 24: codec_id = CODEC_ID_PCM_S24LE; break;
case 32: codec_id = CODEC_ID_PCM_S32LE; break;
}
} else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
codec_id = CODEC_ID_PCM_F64LE;
} else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
int profile = matroska_aac_profile(track->codec_id);
int sri = matroska_aac_sri(track->audio.samplerate);
extradata = av_malloc(5);
if (extradata == NULL)
return AVERROR(ENOMEM);
extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
if (strstr(track->codec_id, "SBR")) {
sri = matroska_aac_sri(track->audio.out_samplerate);
extradata[2] = 0x56;
extradata[3] = 0xE5;
extradata[4] = 0x80 | (sri<<3);
extradata_size = 5;
} else
extradata_size = 2;
} else if (codec_id == CODEC_ID_TTA) {
extradata_size = 30;
extradata = av_mallocz(extradata_size);
if (extradata == NULL)
return AVERROR(ENOMEM);
init_put_byte(&b, extradata, extradata_size, 1,
NULL, NULL, NULL, NULL);
put_buffer(&b, "TTA1", 4);
put_le16(&b, 1);
put_le16(&b, track->audio.channels);
put_le16(&b, track->audio.bitdepth);
put_le32(&b, track->audio.out_samplerate);
put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
} else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
extradata_offset = 26;
} else if (codec_id == CODEC_ID_RA_144) {
track->audio.out_samplerate = 8000;
track->audio.channels = 1;
} else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
int flavor;
init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
0, NULL, NULL, NULL, NULL);
url_fskip(&b, 22);
flavor = get_be16(&b);
track->audio.coded_framesize = get_be32(&b);
url_fskip(&b, 12);
track->audio.sub_packet_h = get_be16(&b);
track->audio.frame_size = get_be16(&b);
track->audio.sub_packet_size = get_be16(&b);
track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
if (codec_id == CODEC_ID_RA_288) {
st->codec->block_align = track->audio.coded_framesize;
track->codec_priv.size = 0;
} else {
if (codec_id == CODEC_ID_SIPR && flavor < 4) {
const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
st->codec->bit_rate = sipr_bit_rate[flavor];
}
st->codec->block_align = track->audio.sub_packet_size;
extradata_offset = 78;
}
}
track->codec_priv.size -= extradata_offset;
if (codec_id == CODEC_ID_NONE)
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown/unsupported CodecID %s.\n", track->codec_id);
if (track->time_scale < 0.01)
track->time_scale = 1.0;
av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
st->codec->codec_id = codec_id;
st->start_time = 0;
if (strcmp(track->language, "und"))
av_metadata_set2(&st->metadata, "language", track->language, 0);
av_metadata_set2(&st->metadata, "title", track->name, 0);
if (track->flag_default)
st->disposition |= AV_DISPOSITION_DEFAULT;
if (track->flag_forced)
st->disposition |= AV_DISPOSITION_FORCED;
if (track->default_duration)
av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
track->default_duration, 1000000000, 30000);
if (!st->codec->extradata) {
if(extradata){
st->codec->extradata = extradata;
st->codec->extradata_size = extradata_size;
} else if(track->codec_priv.data && track->codec_priv.size > 0){
st->codec->extradata = av_mallocz(track->codec_priv.size +
FF_INPUT_BUFFER_PADDING_SIZE);
if(st->codec->extradata == NULL)
return AVERROR(ENOMEM);
st->codec->extradata_size = track->codec_priv.size;
memcpy(st->codec->extradata,
track->codec_priv.data + extradata_offset,
track->codec_priv.size);
}
}
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_tag = track->video.fourcc;
st->codec->width = track->video.pixel_width;
st->codec->height = track->video.pixel_height;
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
st->codec->height * track->video.display_width,
st->codec-> width * track->video.display_height,
255);
if (st->codec->codec_id != CODEC_ID_H264)
st->need_parsing = AVSTREAM_PARSE_HEADERS;
if (track->default_duration)
st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->sample_rate = track->audio.out_samplerate;
st->codec->channels = track->audio.channels;
if (st->codec->codec_id != CODEC_ID_AAC)
st->need_parsing = AVSTREAM_PARSE_HEADERS;
} else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
}
}
attachements = attachements_list->elem;
for (j=0; j<attachements_list->nb_elem; j++) {
if (!(attachements[j].filename && attachements[j].mime &&
attachements[j].bin.data && attachements[j].bin.size > 0)) {
av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
} else {
AVStream *st = av_new_stream(s, 0);
if (st == NULL)
break;
av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
st->codec->codec_id = CODEC_ID_NONE;
st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
st->codec->extradata = av_malloc(attachements[j].bin.size);
if(st->codec->extradata == NULL)
break;
st->codec->extradata_size = attachements[j].bin.size;
memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
strlen(ff_mkv_mime_tags[i].str))) {
st->codec->codec_id = ff_mkv_mime_tags[i].id;
break;
}
}
attachements[j].stream = st;
}
}
chapters = chapters_list->elem;
for (i=0; i<chapters_list->nb_elem; i++)
if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
&& (max_start==0 || chapters[i].start > max_start)) {
chapters[i].chapter =
ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
chapters[i].start, chapters[i].end,
chapters[i].title);
av_metadata_set2(&chapters[i].chapter->metadata,
"title", chapters[i].title, 0);
max_start = chapters[i].start;
}
index_list = &matroska->index;
index = index_list->elem;
if (index_list->nb_elem
&& index[0].time > 100000000000000/matroska->time_scale) {
av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
index_scale = matroska->time_scale;
}
for (i=0; i<index_list->nb_elem; i++) {
EbmlList *pos_list = &index[i].pos;
MatroskaIndexPos *pos = pos_list->elem;
for (j=0; j<pos_list->nb_elem; j++) {
MatroskaTrack *track = matroska_find_track_by_num(matroska,
pos[j].track);
if (track && track->stream)
av_add_index_entry(track->stream,
pos[j].pos + matroska->segment_start,
index[i].time/index_scale, 0, 0,
AVINDEX_KEYFRAME);
}
}
matroska_convert_tags(s);
return 0;
}
/*
* Put one packet in an application-supplied AVPacket struct.
* Returns 0 on success or -1 on failure.
*/
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
AVPacket *pkt)
{
if (matroska->num_packets > 0) {
memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
av_free(matroska->packets[0]);
if (matroska->num_packets > 1) {
memmove(&matroska->packets[0], &matroska->packets[1],
(matroska->num_packets - 1) * sizeof(AVPacket *));
matroska->packets =
av_realloc(matroska->packets, (matroska->num_packets - 1) *
sizeof(AVPacket *));
} else {
av_freep(&matroska->packets);
}
matroska->num_packets--;
return 0;
}
return -1;
}
/*
* Free all packets in our internal queue.
*/
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
{
if (matroska->packets) {
int n;
for (n = 0; n < matroska->num_packets; n++) {
av_free_packet(matroska->packets[n]);
av_free(matroska->packets[n]);
}
av_freep(&matroska->packets);
matroska->num_packets = 0;
}
}
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
int size, int64_t pos, uint64_t cluster_time,
uint64_t duration, int is_keyframe,
int64_t cluster_pos)
{
uint64_t timecode = AV_NOPTS_VALUE;
MatroskaTrack *track;
int res = 0;
AVStream *st;
AVPacket *pkt;
int16_t block_time;
uint32_t *lace_size = NULL;
int n, flags, laces = 0;
uint64_t num;
if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
return res;
}
data += n;
size -= n;
track = matroska_find_track_by_num(matroska, num);
if (size <= 3 || !track || !track->stream) {
av_log(matroska->ctx, AV_LOG_INFO,
"Invalid stream %"PRIu64" or size %u\n", num, size);
return res;
}
st = track->stream;
if (st->discard >= AVDISCARD_ALL)
return res;
if (duration == AV_NOPTS_VALUE)
duration = track->default_duration / matroska->time_scale;
block_time = AV_RB16(data);
data += 2;
flags = *data++;
size -= 3;
if (is_keyframe == -1)
is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
if (cluster_time != (uint64_t)-1
&& (block_time >= 0 || cluster_time >= -block_time)) {
timecode = cluster_time + block_time;
if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
&& timecode < track->end_timecode)
is_keyframe = 0; /* overlapping subtitles are not key frame */
if (is_keyframe)
av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
}
if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
if (!is_keyframe || timecode < matroska->skip_to_timecode)
return res;
matroska->skip_to_keyframe = 0;
}
switch ((flags & 0x06) >> 1) {
case 0x0: /* no lacing */
laces = 1;
lace_size = av_mallocz(sizeof(int));
lace_size[0] = size;
break;
case 0x1: /* Xiph lacing */
case 0x2: /* fixed-size lacing */
case 0x3: /* EBML lacing */
assert(size>0); // size <=3 is checked before size-=3 above
laces = (*data) + 1;
data += 1;
size -= 1;
lace_size = av_mallocz(laces * sizeof(int));
switch ((flags & 0x06) >> 1) {
case 0x1: /* Xiph lacing */ {
uint8_t temp;
uint32_t total = 0;
for (n = 0; res == 0 && n < laces - 1; n++) {
while (1) {
if (size == 0) {
res = -1;
break;
}
temp = *data;
lace_size[n] += temp;
data += 1;
size -= 1;
if (temp != 0xff)
break;
}
total += lace_size[n];
}
lace_size[n] = size - total;
break;
}
case 0x2: /* fixed-size lacing */
for (n = 0; n < laces; n++)
lace_size[n] = size / laces;
break;
case 0x3: /* EBML lacing */ {
uint32_t total;
n = matroska_ebmlnum_uint(matroska, data, size, &num);
if (n < 0) {
av_log(matroska->ctx, AV_LOG_INFO,
"EBML block data error\n");
break;
}
data += n;
size -= n;
total = lace_size[0] = num;
for (n = 1; res == 0 && n < laces - 1; n++) {
int64_t snum;
int r;
r = matroska_ebmlnum_sint(matroska, data, size, &snum);
if (r < 0) {
av_log(matroska->ctx, AV_LOG_INFO,
"EBML block data error\n");
break;
}
data += r;
size -= r;
lace_size[n] = lace_size[n - 1] + snum;
total += lace_size[n];
}
lace_size[n] = size - total;
break;
}
}
break;
}
if (res == 0) {
for (n = 0; n < laces; n++) {
if ((st->codec->codec_id == CODEC_ID_RA_288 ||
st->codec->codec_id == CODEC_ID_COOK ||
st->codec->codec_id == CODEC_ID_SIPR ||
st->codec->codec_id == CODEC_ID_ATRAC3) &&
st->codec->block_align && track->audio.sub_packet_size) {
int a = st->codec->block_align;
int sps = track->audio.sub_packet_size;
int cfs = track->audio.coded_framesize;
int h = track->audio.sub_packet_h;
int y = track->audio.sub_packet_cnt;
int w = track->audio.frame_size;
int x;
if (!track->audio.pkt_cnt) {
if (st->codec->codec_id == CODEC_ID_RA_288)
for (x=0; x<h/2; x++)
memcpy(track->audio.buf+x*2*w+y*cfs,
data+x*cfs, cfs);
else if (st->codec->codec_id == CODEC_ID_SIPR)
memcpy(track->audio.buf + y*w, data, w);
else
for (x=0; x<w/sps; x++)
memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
if (++track->audio.sub_packet_cnt >= h) {
if (st->codec->codec_id == CODEC_ID_SIPR)
ff_rm_reorder_sipr_data(track->audio.buf, h, w);
track->audio.sub_packet_cnt = 0;
track->audio.pkt_cnt = h*w / a;
}
}
while (track->audio.pkt_cnt) {
pkt = av_mallocz(sizeof(AVPacket));
av_new_packet(pkt, a);
memcpy(pkt->data, track->audio.buf
+ a * (h*w / a - track->audio.pkt_cnt--), a);
pkt->pos = pos;
pkt->stream_index = st->index;
dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
}
} else {
MatroskaTrackEncoding *encodings = track->encodings.elem;
int offset = 0, pkt_size = lace_size[n];
uint8_t *pkt_data = data;
if (pkt_size > size) {
av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
break;
}
if (encodings && encodings->scope & 1) {
offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
if (offset < 0)
continue;
}
pkt = av_mallocz(sizeof(AVPacket));
/* XXX: prevent data copy... */
if (av_new_packet(pkt, pkt_size+offset) < 0) {
av_free(pkt);
res = AVERROR(ENOMEM);
break;
}
if (offset)
memcpy (pkt->data, encodings->compression.settings.data, offset);
memcpy (pkt->data+offset, pkt_data, pkt_size);
if (pkt_data != data)
av_free(pkt_data);
if (n == 0)
pkt->flags = is_keyframe;
pkt->stream_index = st->index;
if (track->ms_compat)
pkt->dts = timecode;
else
pkt->pts = timecode;
pkt->pos = pos;
if (st->codec->codec_id == CODEC_ID_TEXT)
pkt->convergence_duration = duration;
else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
pkt->duration = duration;
if (st->codec->codec_id == CODEC_ID_SSA)
matroska_fix_ass_packet(matroska, pkt, duration);
if (matroska->prev_pkt &&
timecode != AV_NOPTS_VALUE &&
matroska->prev_pkt->pts == timecode &&
matroska->prev_pkt->stream_index == st->index &&
st->codec->codec_id == CODEC_ID_SSA)
matroska_merge_packets(matroska->prev_pkt, pkt);
else {
dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
matroska->prev_pkt = pkt;
}
}
if (timecode != AV_NOPTS_VALUE)
timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
data += lace_size[n];
size -= lace_size[n];
}
}
av_free(lace_size);
return res;
}
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
{
MatroskaCluster cluster = { 0 };
EbmlList *blocks_list;
MatroskaBlock *blocks;
int i, res;
int64_t pos = url_ftell(matroska->ctx->pb);
matroska->prev_pkt = NULL;
if (matroska->current_id)
pos -= 4; /* sizeof the ID which was already read */
res = ebml_parse(matroska, matroska_clusters, &cluster);
blocks_list = &cluster.blocks;
blocks = blocks_list->elem;
for (i=0; i<blocks_list->nb_elem; i++)
if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
res=matroska_parse_block(matroska,
blocks[i].bin.data, blocks[i].bin.size,
blocks[i].bin.pos, cluster.timecode,
blocks[i].duration, is_keyframe,
pos);
}
ebml_free(matroska_cluster, &cluster);
if (res < 0) matroska->done = 1;
return res;
}
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MatroskaDemuxContext *matroska = s->priv_data;
while (matroska_deliver_packet(matroska, pkt)) {
if (matroska->done)
return AVERROR_EOF;
matroska_parse_cluster(matroska);
}
return 0;
}
static int matroska_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks = matroska->tracks.elem;
AVStream *st = s->streams[stream_index];
int i, index, index_sub, index_min;
if (!st->nb_index_entries)
return 0;
timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
matroska_clear_queue(matroska);
if (matroska_parse_cluster(matroska) < 0)
break;
}
}
matroska_clear_queue(matroska);
if (index < 0)
return 0;
index_min = index;
for (i=0; i < matroska->tracks.nb_elem; i++) {
tracks[i].end_timecode = 0;
if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
&& !tracks[i].stream->discard != AVDISCARD_ALL) {
index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
if (index_sub >= 0
&& st->index_entries[index_sub].pos < st->index_entries[index_min].pos
&& st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
index_min = index_sub;
}
}
url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
matroska->skip_to_timecode = st->index_entries[index].timestamp;
matroska->done = 0;
av_update_cur_dts(s, st, st->index_entries[index].timestamp);
return 0;
}
static int matroska_read_close(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks = matroska->tracks.elem;
int n;
matroska_clear_queue(matroska);
for (n=0; n < matroska->tracks.nb_elem; n++)
if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
av_free(tracks[n].audio.buf);
ebml_free(matroska_segment, matroska);
return 0;
}
AVInputFormat ff_matroska_demuxer = {
"matroska,webm",
NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
sizeof(MatroskaDemuxContext),
matroska_probe,
matroska_read_header,
matroska_read_packet,
matroska_read_close,
matroska_read_seek,
};
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