/* * 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 * @author Ronald Bultje * @author with a little help from Moritz Bunkus * @author totally reworked by Aurelien Jacobs * @see specs available on the Matroska project page: http://www.matroska.org/ */ #include #include "avformat.h" #include "internal.h" #include "avio_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.h" #include "libavutil/intreadwrite.h" #include "libavutil/avstring.h" #include "libavutil/lzo.h" #include "libavutil/dict.h" #if CONFIG_ZLIB #include #endif #if CONFIG_BZLIB #include #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; EbmlBin color_space; uint64_t stereo_mode; } 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; uint64_t buf_timecode; uint8_t *buf; } MatroskaTrackAudio; typedef struct { uint64_t uid; uint64_t type; } MatroskaTrackPlane; typedef struct { EbmlList combine_planes; } MatroskaTrackOperation; 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; MatroskaTrackOperation operation; 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; /* File has a CUES element, but we defer parsing until it is needed. */ int cues_parsing_deferred; } 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_BIN, 0, offsetof(MatroskaTrackVideo,color_space) }, { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,stereo_mode) }, { 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_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_plane[] = { { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) }, { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) }, { 0 } }; static EbmlSyntax matroska_track_combine_planes[] = { { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n=matroska_track_plane} }, { 0 } }; static EbmlSyntax matroska_track_operation[] = { { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n=matroska_track_combine_planes} }, { 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_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack,operation), {.n=matroska_track_operation} }, { 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) }, { 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) { AVIOContext *pb = matroska->ctx->pb; int64_t pos = avio_tell(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, AVIOContext *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 - avio_r8() 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 = avio_r8(pb))) { /* we might encounter EOS here */ if (!url_feof(pb)) { int64_t pos = avio_tell(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 = avio_tell(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) | avio_r8(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, AVIOContext *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(AVIOContext *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) | avio_r8(pb); return 0; } /* * Read the next element as a float. * 0 is success, < 0 is failure. */ static int ebml_read_float(AVIOContext *pb, int size, double *num) { if (size == 0) { *num = 0; } else if (size == 4) { *num = av_int2float(avio_rb32(pb)); } else if (size == 8){ *num = av_int2double(avio_rb64(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(AVIOContext *pb, int size, char **str) { char *res; /* EBML strings are usually not 0-terminated, so we allocate one * byte more, read the string and NULL-terminate it ourselves. */ if (!(res = av_malloc(size + 1))) return AVERROR(ENOMEM); if (avio_read(pb, (uint8_t *) res, size) != size) { av_free(res); return AVERROR(EIO); } (res)[size] = '\0'; av_free(*str); *str = res; return 0; } /* * Read the next element as binary data. * 0 is success, < 0 is failure. */ static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin) { av_free(bin->data); if (!(bin->data = av_malloc(length))) return AVERROR(ENOMEM); bin->size = length; bin->pos = avio_tell(pb); if (avio_read(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) { AVIOContext *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 = avio_tell(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) { AVIOContext pb; ffio_init_context(&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 }; AVIOContext *pb = matroska->ctx->pb; uint32_t id = syntax->id; uint64_t length; int res; void *newelem; data = (char *)data + syntax->data_offset; if (syntax->list_elem_size) { EbmlList *list = data; newelem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size); if (!newelem) return AVERROR(ENOMEM); list->elem = newelem; 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 = avio_tell(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 avio_skip(pb,length)<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; jnb_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]); if (total < probelen) continue; 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; uint8_t* newpktdata; 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; newpktdata = av_realloc(pkt_data, pkt_size); if (!newpktdata) { inflateEnd(&zstream); goto failed; } pkt_data = newpktdata; zstream.avail_out = pkt_size - zstream.total_out; zstream.next_out = pkt_data + zstream.total_out; if (pkt_data) { result = inflate(&zstream, Z_NO_FLUSH); } else result = Z_MEM_ERROR; } 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; newpktdata = av_realloc(pkt_data, pkt_size); if (!newpktdata) { BZ2_bzDecompressEnd(&bzstream); goto failed; } pkt_data = newpktdata; bzstream.avail_out = pkt_size - bzstream.total_out_lo32; bzstream.next_out = pkt_data + bzstream.total_out_lo32; if (pkt_data) { result = BZ2_bzDecompress(&bzstream); } else result = BZ_MEM_ERROR; } 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!=',' && ptrpts + 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 int matroska_merge_packets(AVPacket *out, AVPacket *in) { void *newdata = av_realloc(out->data, out->size+in->size); if (!newdata) return AVERROR(ENOMEM); out->data = newdata; memcpy(out->data+out->size, in->data, in->size); out->size += in->size; av_destruct_packet(in); av_free(in); return 0; } static void matroska_convert_tag(AVFormatContext *s, EbmlList *list, AVDictionary **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_dict_set(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_dict_set(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; jattachments.nb_elem; j++) if (attachment[j].uid == tags[i].target.attachuid && attachment[j].stream) 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; jchapters.nb_elem; j++) if (chapter[j].uid == tags[i].target.chapteruid && chapter[j].chapter) 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; jtracks.nb_elem; j++) if (track[j].uid == tags[i].target.trackuid && track[j].stream) 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 int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx) { EbmlList *seekhead_list = &matroska->seekhead; MatroskaSeekhead *seekhead = seekhead_list->elem; uint32_t level_up = matroska->level_up; int64_t before_pos = avio_tell(matroska->ctx->pb); uint32_t saved_id = matroska->current_id; MatroskaLevel level; int64_t offset; int ret = 0; if (idx >= seekhead_list->nb_elem || seekhead[idx].id == MATROSKA_ID_SEEKHEAD || seekhead[idx].id == MATROSKA_ID_CLUSTER) return 0; /* seek */ offset = seekhead[idx].pos + matroska->segment_start; if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) { /* 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); ret = AVERROR_INVALIDDATA; } else { level.start = 0; level.length = (uint64_t)-1; matroska->levels[matroska->num_levels] = level; matroska->num_levels++; matroska->current_id = 0; ret = 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 */ avio_seek(matroska->ctx->pb, before_pos, SEEK_SET); matroska->level_up = level_up; matroska->current_id = saved_id; return ret; } static void matroska_execute_seekhead(MatroskaDemuxContext *matroska) { EbmlList *seekhead_list = &matroska->seekhead; int64_t before_pos = avio_tell(matroska->ctx->pb); int i; // we should not do any seeking in the streaming case if (!matroska->ctx->pb->seekable || (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)) return; for (i = 0; i < seekhead_list->nb_elem; i++) { MatroskaSeekhead *seekhead = seekhead_list->elem; if (seekhead[i].pos <= before_pos) continue; // defer cues parsing until we actually need cue data. if (seekhead[i].id == MATROSKA_ID_CUES) { matroska->cues_parsing_deferred = 1; continue; } if (matroska_parse_seekhead_entry(matroska, i) < 0) break; } } static void matroska_add_index_entries(MatroskaDemuxContext *matroska) { EbmlList *index_list; MatroskaIndex *index; int index_scale = 1; int i, j; index_list = &matroska->index; index = index_list->elem; if (index_list->nb_elem && index[0].time > 1E14/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); } } } static void matroska_parse_cues(MatroskaDemuxContext *matroska) { EbmlList *seekhead_list = &matroska->seekhead; MatroskaSeekhead *seekhead = seekhead_list->elem; int i; for (i = 0; i < seekhead_list->nb_elem; i++) if (seekhead[i].id == MATROSKA_ID_CUES) break; assert(i <= seekhead_list->nb_elem); matroska_parse_seekhead_entry(matroska, i); matroska_add_index_entries(matroska); } static int matroska_aac_profile(char *codec_id) { static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" }; int profile; for (profile=0; profilepriv_data; EbmlList *attachements_list = &matroska->attachments; MatroskaAttachement *attachements; EbmlList *chapters_list = &matroska->chapters; MatroskaChapter *chapters; MatroskaTrack *tracks; uint64_t max_start = 0; Ebml ebml = { 0 }; AVStream *st; int i, j, k, 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 > 3) { 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; } else if (ebml.doctype_version == 3) { av_log(matroska->ctx, AV_LOG_WARNING, "EBML header using unsupported features\n" "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n", ebml.version, ebml.doctype, ebml.doctype_version); } 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_dict_set(&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 = &track->encodings; MatroskaTrackEncoding *encodings = encodings_list->elem; uint8_t *extradata = NULL; int extradata_size = 0; int extradata_offset = 0; uint32_t fourcc = 0; AVIOContext 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; if (track->video.color_space.size == 4) fourcc = AV_RL32(track->video.color_space.data); } 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 not 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 = avformat_new_stream(s, NULL); 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; fourcc = AV_RL32(track->codec_priv.data + 16); codec_id = ff_codec_get_id(ff_codec_bmp_tags, fourcc); extradata_offset = 40; } else if (!strcmp(track->codec_id, "A_MS/ACM") && track->codec_priv.size >= 14 && track->codec_priv.data != NULL) { int ret; ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size, 0, NULL, NULL, NULL, NULL); ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size); if (ret < 0) return ret; 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)) { fourcc = AV_RL32(track->codec_priv.data); codec_id = ff_codec_get_id(codec_movvideo_tags, 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_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE); 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 + FF_INPUT_BUFFER_PADDING_SIZE); if (extradata == NULL) return AVERROR(ENOMEM); ffio_init_context(&b, extradata, extradata_size, 1, NULL, NULL, NULL, NULL); avio_write(&b, "TTA1", 4); avio_wl16(&b, 1); avio_wl16(&b, track->audio.channels); avio_wl16(&b, track->audio.bitdepth); avio_wl32(&b, track->audio.out_samplerate); avio_wl32(&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; ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size, 0, NULL, NULL, NULL, NULL); avio_skip(&b, 22); flavor = avio_rb16(&b); track->audio.coded_framesize = avio_rb32(&b); avio_skip(&b, 12); track->audio.sub_packet_h = avio_rb16(&b); track->audio.frame_size = avio_rb16(&b); track->audio.sub_packet_size = avio_rb16(&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; avpriv_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_dict_set(&st->metadata, "language", track->language, 0); av_dict_set(&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 (!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) { MatroskaTrackPlane *planes = track->operation.combine_planes.elem; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_tag = 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); /* export stereo mode flag as metadata tag */ if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREO_MODE_COUNT) av_dict_set(&st->metadata, "stereo_mode", matroska_video_stereo_mode[track->video.stereo_mode], 0); /* if we have virtual track, mark the real tracks */ for (j=0; j < track->operation.combine_planes.nb_elem; j++) { char buf[32]; if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT) continue; snprintf(buf, sizeof(buf), "%s_%d", matroska_video_stereo_plane[planes[j].type], i); for (k=0; k < matroska->tracks.nb_elem; k++) if (planes[j].uid == tracks[k].uid) { av_dict_set(&s->streams[k]->metadata, "stereo_mode", buf, 0); break; } } } 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; jnb_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 = avformat_new_stream(s, NULL); if (st == NULL) break; av_dict_set(&st->metadata, "filename",attachements[j].filename, 0); av_dict_set(&st->metadata, "mimetype", attachements[j].mime, 0); st->codec->codec_id = CODEC_ID_NONE; st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT; st->codec->extradata = av_malloc(attachements[j].bin.size + FF_INPUT_BUFFER_PADDING_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; inb_elem; i++) if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid && (max_start==0 || chapters[i].start > max_start)) { chapters[i].chapter = avpriv_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000}, chapters[i].start, chapters[i].end, chapters[i].title); av_dict_set(&chapters[i].chapter->metadata, "title", chapters[i].title, 0); max_start = chapters[i].start; } matroska_add_index_entries(matroska); 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) { void *newpackets; memmove(&matroska->packets[0], &matroska->packets[1], (matroska->num_packets - 1) * sizeof(AVPacket *)); newpackets = av_realloc(matroska->packets, (matroska->num_packets - 1) * sizeof(AVPacket *)); if (newpackets) matroska->packets = newpackets; } 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 (!track || !track->stream) { av_log(matroska->ctx, AV_LOG_INFO, "Invalid stream %"PRIu64" or size %u\n", num, size); return res; } else if (size <= 3) return 0; st = track->stream; if (st->discard >= AVDISCARD_ALL) return res; if (!duration) 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[laces - 1] = 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 (track->audio.sub_packet_cnt == 0) track->audio.buf_timecode = timecode; if (st->codec->codec_id == CODEC_ID_RA_288) { if (size < cfs * h / 2) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt int4 RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } for (x=0; xaudio.buf+x*2*w+y*cfs, data+x*cfs, cfs); } else if (st->codec->codec_id == CODEC_ID_SIPR) { if (size < w) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt sipr RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } memcpy(track->audio.buf + y*w, data, w); } else { if (size < sps * w / sps) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt generic RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } for (x=0; xaudio.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->pts = track->audio.buf_timecode; track->audio.buf_timecode = AV_NOPTS_VALUE; 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 = avio_tell(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; inb_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; /* Parse the CUES now since we need the index data to seek. */ if (matroska->cues_parsing_deferred) { matroska_parse_cues(matroska); matroska->cues_parsing_deferred = 0; } 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) { avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET); matroska->current_id = 0; 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].audio.pkt_cnt = 0; tracks[i].audio.sub_packet_cnt = 0; tracks[i].audio.buf_timecode = AV_NOPTS_VALUE; 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; } } avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET); matroska->current_id = 0; matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY); matroska->skip_to_timecode = st->index_entries[index].timestamp; matroska->done = 0; ff_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 = { .name = "matroska,webm", .long_name = NULL_IF_CONFIG_SMALL("Matroska/WebM file format"), .priv_data_size = sizeof(MatroskaDemuxContext), .read_probe = matroska_probe, .read_header = matroska_read_header, .read_packet = matroska_read_packet, .read_close = matroska_read_close, .read_seek = matroska_read_seek, };