2 * Matroska file demuxer
3 * Copyright (c) 2003-2008 The FFmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Matroska file demuxer
25 * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
26 * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
27 * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28 * @see specs available on the Matroska project page: http://www.matroska.org/
42 #include "libavutil/avstring.h"
43 #include "libavutil/base64.h"
44 #include "libavutil/dict.h"
45 #include "libavutil/intfloat.h"
46 #include "libavutil/intreadwrite.h"
47 #include "libavutil/lzo.h"
48 #include "libavutil/mathematics.h"
50 #include "libavcodec/bytestream.h"
51 #include "libavcodec/mpeg4audio.h"
54 #include "avio_internal.h"
58 /* For ff_codec_get_id(). */
76 typedef const struct EbmlSyntax {
85 const struct EbmlSyntax *n;
105 uint64_t doctype_version;
111 } MatroskaTrackCompression;
116 } MatroskaTrackEncryption;
121 MatroskaTrackCompression compression;
122 MatroskaTrackEncryption encryption;
123 } MatroskaTrackEncoding;
127 uint64_t display_width;
128 uint64_t display_height;
129 uint64_t pixel_width;
130 uint64_t pixel_height;
132 uint64_t stereo_mode;
134 } MatroskaTrackVideo;
138 double out_samplerate;
142 /* real audio header (extracted from extradata) */
149 uint64_t buf_timecode;
151 } MatroskaTrackAudio;
156 } MatroskaTrackPlane;
159 EbmlList combine_planes;
160 } MatroskaTrackOperation;
171 uint64_t default_duration;
172 uint64_t flag_default;
173 uint64_t flag_forced;
174 uint64_t seek_preroll;
175 MatroskaTrackVideo video;
176 MatroskaTrackAudio audio;
177 MatroskaTrackOperation operation;
179 uint64_t codec_delay;
182 int64_t end_timecode;
184 uint64_t max_block_additional_id;
194 } MatroskaAttachment;
232 MatroskaTagTarget target;
252 AVFormatContext *ctx;
256 MatroskaLevel levels[EBML_MAX_DEPTH];
266 EbmlList attachments;
272 /* byte position of the segment inside the stream */
273 int64_t segment_start;
275 /* the packet queue */
282 /* What to skip before effectively reading a packet. */
283 int skip_to_keyframe;
284 uint64_t skip_to_timecode;
286 /* File has a CUES element, but we defer parsing until it is needed. */
287 int cues_parsing_deferred;
289 int current_cluster_num_blocks;
290 int64_t current_cluster_pos;
291 MatroskaCluster current_cluster;
293 /* File has SSA subtitles which prevent incremental cluster parsing. */
295 } MatroskaDemuxContext;
302 uint64_t additional_id;
304 int64_t discard_padding;
307 static EbmlSyntax ebml_header[] = {
308 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
309 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
310 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
311 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
312 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
313 { EBML_ID_EBMLVERSION, EBML_NONE },
314 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
318 static EbmlSyntax ebml_syntax[] = {
319 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
323 static EbmlSyntax matroska_info[] = {
324 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
325 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
326 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
327 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
328 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
329 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
330 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
334 static EbmlSyntax matroska_track_video[] = {
335 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
336 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
337 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
338 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
339 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
340 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
341 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode) },
342 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
343 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
344 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
345 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
346 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
347 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
348 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
349 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
353 static EbmlSyntax matroska_track_audio[] = {
354 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
355 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
356 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
357 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
361 static EbmlSyntax matroska_track_encoding_compression[] = {
362 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
363 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
367 static EbmlSyntax matroska_track_encoding_encryption[] = {
368 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
369 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
370 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
371 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
372 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
373 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
374 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
377 static EbmlSyntax matroska_track_encoding[] = {
378 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
379 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
380 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
381 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
382 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
386 static EbmlSyntax matroska_track_encodings[] = {
387 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
391 static EbmlSyntax matroska_track_plane[] = {
392 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
393 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
397 static EbmlSyntax matroska_track_combine_planes[] = {
398 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
402 static EbmlSyntax matroska_track_operation[] = {
403 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
407 static EbmlSyntax matroska_track[] = {
408 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
409 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
410 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
411 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
412 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
413 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
414 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
415 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
416 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
417 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
418 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
419 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
420 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
421 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
422 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
423 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
424 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
425 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
426 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
427 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
428 { MATROSKA_ID_CODECNAME, EBML_NONE },
429 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
430 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
431 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
432 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
433 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
437 static EbmlSyntax matroska_tracks[] = {
438 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
442 static EbmlSyntax matroska_attachment[] = {
443 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
444 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
445 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
446 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
447 { MATROSKA_ID_FILEDESC, EBML_NONE },
451 static EbmlSyntax matroska_attachments[] = {
452 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
456 static EbmlSyntax matroska_chapter_display[] = {
457 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
458 { MATROSKA_ID_CHAPLANG, EBML_NONE },
462 static EbmlSyntax matroska_chapter_entry[] = {
463 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
464 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
465 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
466 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
467 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
468 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
469 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
470 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
474 static EbmlSyntax matroska_chapter[] = {
475 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
476 { MATROSKA_ID_EDITIONUID, EBML_NONE },
477 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
478 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
479 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
483 static EbmlSyntax matroska_chapters[] = {
484 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
488 static EbmlSyntax matroska_index_pos[] = {
489 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
490 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
491 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
492 { MATROSKA_ID_CUEDURATION, EBML_NONE },
493 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
497 static EbmlSyntax matroska_index_entry[] = {
498 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
499 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
503 static EbmlSyntax matroska_index[] = {
504 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
508 static EbmlSyntax matroska_simpletag[] = {
509 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
510 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
511 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
512 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
513 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
514 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
518 static EbmlSyntax matroska_tagtargets[] = {
519 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
520 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
521 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
522 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
523 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
527 static EbmlSyntax matroska_tag[] = {
528 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
529 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
533 static EbmlSyntax matroska_tags[] = {
534 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
538 static EbmlSyntax matroska_seekhead_entry[] = {
539 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
540 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
544 static EbmlSyntax matroska_seekhead[] = {
545 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
549 static EbmlSyntax matroska_segment[] = {
550 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } },
551 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } },
552 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } },
553 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } },
554 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } },
555 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } },
556 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } },
557 { MATROSKA_ID_CLUSTER, EBML_STOP },
561 static EbmlSyntax matroska_segments[] = {
562 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
566 static EbmlSyntax matroska_blockmore[] = {
567 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
568 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
572 static EbmlSyntax matroska_blockadditions[] = {
573 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
577 static EbmlSyntax matroska_blockgroup[] = {
578 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
579 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
580 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
581 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
582 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
583 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
584 { MATROSKA_ID_CODECSTATE, EBML_NONE },
585 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
589 static EbmlSyntax matroska_cluster[] = {
590 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
591 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
592 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
593 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
594 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
598 static EbmlSyntax matroska_clusters[] = {
599 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
600 { MATROSKA_ID_INFO, EBML_NONE },
601 { MATROSKA_ID_CUES, EBML_NONE },
602 { MATROSKA_ID_TAGS, EBML_NONE },
603 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
607 static EbmlSyntax matroska_cluster_incremental_parsing[] = {
608 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
609 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
610 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
611 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
612 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
613 { MATROSKA_ID_INFO, EBML_NONE },
614 { MATROSKA_ID_CUES, EBML_NONE },
615 { MATROSKA_ID_TAGS, EBML_NONE },
616 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
617 { MATROSKA_ID_CLUSTER, EBML_STOP },
621 static EbmlSyntax matroska_cluster_incremental[] = {
622 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
623 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
624 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
625 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
626 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
630 static EbmlSyntax matroska_clusters_incremental[] = {
631 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
632 { MATROSKA_ID_INFO, EBML_NONE },
633 { MATROSKA_ID_CUES, EBML_NONE },
634 { MATROSKA_ID_TAGS, EBML_NONE },
635 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
639 static const char *const matroska_doctypes[] = { "matroska", "webm" };
641 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
643 AVIOContext *pb = matroska->ctx->pb;
645 matroska->current_id = 0;
646 matroska->num_levels = 0;
648 /* seek to next position to resync from */
649 if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
654 // try to find a toplevel element
655 while (!url_feof(pb)) {
656 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
657 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
658 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
659 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
660 matroska->current_id = id;
663 id = (id << 8) | avio_r8(pb);
672 * Return: Whether we reached the end of a level in the hierarchy or not.
674 static int ebml_level_end(MatroskaDemuxContext *matroska)
676 AVIOContext *pb = matroska->ctx->pb;
677 int64_t pos = avio_tell(pb);
679 if (matroska->num_levels > 0) {
680 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
681 if (pos - level->start >= level->length || matroska->current_id) {
682 matroska->num_levels--;
690 * Read: an "EBML number", which is defined as a variable-length
691 * array of bytes. The first byte indicates the length by giving a
692 * number of 0-bits followed by a one. The position of the first
693 * "one" bit inside the first byte indicates the length of this
695 * Returns: number of bytes read, < 0 on error
697 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
698 int max_size, uint64_t *number)
703 /* The first byte tells us the length in bytes - avio_r8() can normally
704 * return 0, but since that's not a valid first ebmlID byte, we can
705 * use it safely here to catch EOS. */
706 if (!(total = avio_r8(pb))) {
707 /* we might encounter EOS here */
709 int64_t pos = avio_tell(pb);
710 av_log(matroska->ctx, AV_LOG_ERROR,
711 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
713 return pb->error ? pb->error : AVERROR(EIO);
718 /* get the length of the EBML number */
719 read = 8 - ff_log2_tab[total];
720 if (read > max_size) {
721 int64_t pos = avio_tell(pb) - 1;
722 av_log(matroska->ctx, AV_LOG_ERROR,
723 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
724 (uint8_t) total, pos, pos);
725 return AVERROR_INVALIDDATA;
728 /* read out length */
729 total ^= 1 << ff_log2_tab[total];
731 total = (total << 8) | avio_r8(pb);
739 * Read a EBML length value.
740 * This needs special handling for the "unknown length" case which has multiple
743 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
746 int res = ebml_read_num(matroska, pb, 8, number);
747 if (res > 0 && *number + 1 == 1ULL << (7 * res))
748 *number = 0xffffffffffffffULL;
753 * Read the next element as an unsigned int.
754 * 0 is success, < 0 is failure.
756 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
761 return AVERROR_INVALIDDATA;
763 /* big-endian ordering; build up number */
766 *num = (*num << 8) | avio_r8(pb);
772 * Read the next element as a signed int.
773 * 0 is success, < 0 is failure.
775 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
780 return AVERROR_INVALIDDATA;
785 *num = sign_extend(avio_r8(pb), 8);
787 /* big-endian ordering; build up number */
789 *num = (*num << 8) | avio_r8(pb);
796 * Read the next element as a float.
797 * 0 is success, < 0 is failure.
799 static int ebml_read_float(AVIOContext *pb, int size, double *num)
804 *num = av_int2float(avio_rb32(pb));
806 *num = av_int2double(avio_rb64(pb));
808 return AVERROR_INVALIDDATA;
814 * Read the next element as an ASCII string.
815 * 0 is success, < 0 is failure.
817 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
821 /* EBML strings are usually not 0-terminated, so we allocate one
822 * byte more, read the string and NULL-terminate it ourselves. */
823 if (!(res = av_malloc(size + 1)))
824 return AVERROR(ENOMEM);
825 if (avio_read(pb, (uint8_t *) res, size) != size) {
837 * Read the next element as binary data.
838 * 0 is success, < 0 is failure.
840 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
842 av_fast_padded_malloc(&bin->data, &bin->size, length);
844 return AVERROR(ENOMEM);
847 bin->pos = avio_tell(pb);
848 if (avio_read(pb, bin->data, length) != length) {
849 av_freep(&bin->data);
858 * Read the next element, but only the header. The contents
859 * are supposed to be sub-elements which can be read separately.
860 * 0 is success, < 0 is failure.
862 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
864 AVIOContext *pb = matroska->ctx->pb;
865 MatroskaLevel *level;
867 if (matroska->num_levels >= EBML_MAX_DEPTH) {
868 av_log(matroska->ctx, AV_LOG_ERROR,
869 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
870 return AVERROR(ENOSYS);
873 level = &matroska->levels[matroska->num_levels++];
874 level->start = avio_tell(pb);
875 level->length = length;
881 * Read signed/unsigned "EBML" numbers.
882 * Return: number of bytes processed, < 0 on error
884 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
885 uint8_t *data, uint32_t size, uint64_t *num)
888 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
889 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
893 * Same as above, but signed.
895 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
896 uint8_t *data, uint32_t size, int64_t *num)
901 /* read as unsigned number first */
902 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
905 /* make signed (weird way) */
906 *num = unum - ((1LL << (7 * res - 1)) - 1);
911 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
912 EbmlSyntax *syntax, void *data);
914 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
915 uint32_t id, void *data)
918 for (i = 0; syntax[i].id; i++)
919 if (id == syntax[i].id)
921 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
922 matroska->num_levels > 0 &&
923 matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
924 return 0; // we reached the end of an unknown size cluster
925 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
926 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%"PRIX32"\n", id);
927 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
928 return AVERROR_INVALIDDATA;
930 return ebml_parse_elem(matroska, &syntax[i], data);
933 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
936 if (!matroska->current_id) {
938 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
941 matroska->current_id = id | 1 << 7 * res;
943 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
946 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
951 for (i = 0; syntax[i].id; i++)
952 switch (syntax[i].type) {
954 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
957 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
961 // the default may be NULL
962 if (syntax[i].def.s) {
963 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
964 *dst = av_strdup(syntax[i].def.s);
966 return AVERROR(ENOMEM);
971 while (!res && !ebml_level_end(matroska))
972 res = ebml_parse(matroska, syntax, data);
977 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
978 EbmlSyntax *syntax, void *data)
980 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
983 // max. 16 MB for strings
984 [EBML_STR] = 0x1000000,
985 [EBML_UTF8] = 0x1000000,
986 // max. 256 MB for binary data
987 [EBML_BIN] = 0x10000000,
988 // no limits for anything else
990 AVIOContext *pb = matroska->ctx->pb;
991 uint32_t id = syntax->id;
996 data = (char *) data + syntax->data_offset;
997 if (syntax->list_elem_size) {
998 EbmlList *list = data;
999 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1001 return AVERROR(ENOMEM);
1002 list->elem = newelem;
1003 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1004 memset(data, 0, syntax->list_elem_size);
1008 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1009 matroska->current_id = 0;
1010 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1012 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1013 av_log(matroska->ctx, AV_LOG_ERROR,
1014 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1015 length, max_lengths[syntax->type], syntax->type);
1016 return AVERROR_INVALIDDATA;
1020 switch (syntax->type) {
1022 res = ebml_read_uint(pb, length, data);
1025 res = ebml_read_sint(pb, length, data);
1028 res = ebml_read_float(pb, length, data);
1032 res = ebml_read_ascii(pb, length, data);
1035 res = ebml_read_binary(pb, length, data);
1038 if ((res = ebml_read_master(matroska, length)) < 0)
1040 if (id == MATROSKA_ID_SEGMENT)
1041 matroska->segment_start = avio_tell(matroska->ctx->pb);
1042 return ebml_parse_nest(matroska, syntax->def.n, data);
1044 return ebml_parse_id(matroska, syntax->def.n, id, data);
1048 if (ffio_limit(pb, length) != length)
1049 return AVERROR(EIO);
1050 return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1052 if (res == AVERROR_INVALIDDATA)
1053 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1054 else if (res == AVERROR(EIO))
1055 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1059 static void ebml_free(EbmlSyntax *syntax, void *data)
1062 for (i = 0; syntax[i].id; i++) {
1063 void *data_off = (char *) data + syntax[i].data_offset;
1064 switch (syntax[i].type) {
1070 av_freep(&((EbmlBin *) data_off)->data);
1073 if (syntax[i].list_elem_size) {
1074 EbmlList *list = data_off;
1075 char *ptr = list->elem;
1076 for (j = 0; j < list->nb_elem;
1077 j++, ptr += syntax[i].list_elem_size)
1078 ebml_free(syntax[i].def.n, ptr);
1079 av_free(list->elem);
1081 ebml_free(syntax[i].def.n, data_off);
1091 static int matroska_probe(AVProbeData *p)
1094 int len_mask = 0x80, size = 1, n = 1, i;
1097 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1100 /* length of header */
1102 while (size <= 8 && !(total & len_mask)) {
1108 total &= (len_mask - 1);
1110 total = (total << 8) | p->buf[4 + n++];
1112 /* Does the probe data contain the whole header? */
1113 if (p->buf_size < 4 + size + total)
1116 /* The header should contain a known document type. For now,
1117 * we don't parse the whole header but simply check for the
1118 * availability of that array of characters inside the header.
1119 * Not fully fool-proof, but good enough. */
1120 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1121 int probelen = strlen(matroska_doctypes[i]);
1122 if (total < probelen)
1124 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1125 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1126 return AVPROBE_SCORE_MAX;
1129 // probably valid EBML header but no recognized doctype
1130 return AVPROBE_SCORE_EXTENSION;
1133 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1136 MatroskaTrack *tracks = matroska->tracks.elem;
1139 for (i = 0; i < matroska->tracks.nb_elem; i++)
1140 if (tracks[i].num == num)
1143 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1147 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1148 MatroskaTrack *track)
1150 MatroskaTrackEncoding *encodings = track->encodings.elem;
1151 uint8_t *data = *buf;
1152 int isize = *buf_size;
1153 uint8_t *pkt_data = NULL;
1154 uint8_t av_unused *newpktdata;
1155 int pkt_size = isize;
1159 if (pkt_size >= 10000000U)
1160 return AVERROR_INVALIDDATA;
1162 switch (encodings[0].compression.algo) {
1163 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1165 int header_size = encodings[0].compression.settings.size;
1166 uint8_t *header = encodings[0].compression.settings.data;
1168 if (header_size && !header) {
1169 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1176 pkt_size = isize + header_size;
1177 pkt_data = av_malloc(pkt_size);
1179 return AVERROR(ENOMEM);
1181 memcpy(pkt_data, header, header_size);
1182 memcpy(pkt_data + header_size, data, isize);
1186 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1188 olen = pkt_size *= 3;
1189 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1191 result = AVERROR(ENOMEM);
1194 pkt_data = newpktdata;
1195 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1196 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1198 result = AVERROR_INVALIDDATA;
1205 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1207 z_stream zstream = { 0 };
1208 if (inflateInit(&zstream) != Z_OK)
1210 zstream.next_in = data;
1211 zstream.avail_in = isize;
1214 newpktdata = av_realloc(pkt_data, pkt_size);
1216 inflateEnd(&zstream);
1219 pkt_data = newpktdata;
1220 zstream.avail_out = pkt_size - zstream.total_out;
1221 zstream.next_out = pkt_data + zstream.total_out;
1223 result = inflate(&zstream, Z_NO_FLUSH);
1225 result = Z_MEM_ERROR;
1226 } while (result == Z_OK && pkt_size < 10000000);
1227 pkt_size = zstream.total_out;
1228 inflateEnd(&zstream);
1229 if (result != Z_STREAM_END) {
1230 if (result == Z_MEM_ERROR)
1231 result = AVERROR(ENOMEM);
1233 result = AVERROR_INVALIDDATA;
1240 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1242 bz_stream bzstream = { 0 };
1243 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1245 bzstream.next_in = data;
1246 bzstream.avail_in = isize;
1249 newpktdata = av_realloc(pkt_data, pkt_size);
1251 BZ2_bzDecompressEnd(&bzstream);
1254 pkt_data = newpktdata;
1255 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1256 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1258 result = BZ2_bzDecompress(&bzstream);
1260 result = BZ_MEM_ERROR;
1261 } while (result == BZ_OK && pkt_size < 10000000);
1262 pkt_size = bzstream.total_out_lo32;
1263 BZ2_bzDecompressEnd(&bzstream);
1264 if (result != BZ_STREAM_END) {
1265 if (result == BZ_MEM_ERROR)
1266 result = AVERROR(ENOMEM);
1268 result = AVERROR_INVALIDDATA;
1275 return AVERROR_INVALIDDATA;
1279 *buf_size = pkt_size;
1288 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1289 AVPacket *pkt, uint64_t display_duration)
1292 char *layer, *ptr = pkt->data, *end = ptr + pkt->size;
1294 for (; *ptr != ',' && ptr < end - 1; ptr++)
1299 for (; *ptr != ',' && ptr < end - 1; ptr++)
1302 int64_t end_pts = pkt->pts + display_duration;
1303 int sc = matroska->time_scale * pkt->pts / 10000000;
1304 int ec = matroska->time_scale * end_pts / 10000000;
1305 int sh, sm, ss, eh, em, es, len;
1319 len = 50 + end - ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1320 if (!(line = av_buffer_alloc(len)))
1322 snprintf(line->data, len,
1323 "Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1324 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1325 av_buffer_unref(&pkt->buf);
1327 pkt->data = line->data;
1328 pkt->size = strlen(line->data);
1332 static int matroska_merge_packets(AVPacket *out, AVPacket *in)
1334 int ret = av_grow_packet(out, in->size);
1338 memcpy(out->data + out->size - in->size, in->data, in->size);
1346 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1347 AVDictionary **metadata, char *prefix)
1349 MatroskaTag *tags = list->elem;
1353 for (i = 0; i < list->nb_elem; i++) {
1354 const char *lang = tags[i].lang &&
1355 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1357 if (!tags[i].name) {
1358 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1362 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1364 av_strlcpy(key, tags[i].name, sizeof(key));
1365 if (tags[i].def || !lang) {
1366 av_dict_set(metadata, key, tags[i].string, 0);
1367 if (tags[i].sub.nb_elem)
1368 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1371 av_strlcat(key, "-", sizeof(key));
1372 av_strlcat(key, lang, sizeof(key));
1373 av_dict_set(metadata, key, tags[i].string, 0);
1374 if (tags[i].sub.nb_elem)
1375 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1378 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1381 static void matroska_convert_tags(AVFormatContext *s)
1383 MatroskaDemuxContext *matroska = s->priv_data;
1384 MatroskaTags *tags = matroska->tags.elem;
1387 for (i = 0; i < matroska->tags.nb_elem; i++) {
1388 if (tags[i].target.attachuid) {
1389 MatroskaAttachment *attachment = matroska->attachments.elem;
1390 for (j = 0; j < matroska->attachments.nb_elem; j++)
1391 if (attachment[j].uid == tags[i].target.attachuid &&
1392 attachment[j].stream)
1393 matroska_convert_tag(s, &tags[i].tag,
1394 &attachment[j].stream->metadata, NULL);
1395 } else if (tags[i].target.chapteruid) {
1396 MatroskaChapter *chapter = matroska->chapters.elem;
1397 for (j = 0; j < matroska->chapters.nb_elem; j++)
1398 if (chapter[j].uid == tags[i].target.chapteruid &&
1400 matroska_convert_tag(s, &tags[i].tag,
1401 &chapter[j].chapter->metadata, NULL);
1402 } else if (tags[i].target.trackuid) {
1403 MatroskaTrack *track = matroska->tracks.elem;
1404 for (j = 0; j < matroska->tracks.nb_elem; j++)
1405 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1406 matroska_convert_tag(s, &tags[i].tag,
1407 &track[j].stream->metadata, NULL);
1409 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1410 tags[i].target.type);
1415 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1418 EbmlList *seekhead_list = &matroska->seekhead;
1419 uint32_t level_up = matroska->level_up;
1420 uint32_t saved_id = matroska->current_id;
1421 MatroskaSeekhead *seekhead = seekhead_list->elem;
1422 int64_t before_pos = avio_tell(matroska->ctx->pb);
1423 MatroskaLevel level;
1427 if (idx >= seekhead_list->nb_elem ||
1428 seekhead[idx].id == MATROSKA_ID_SEEKHEAD ||
1429 seekhead[idx].id == MATROSKA_ID_CLUSTER)
1433 offset = seekhead[idx].pos + matroska->segment_start;
1434 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1435 /* We don't want to lose our seekhead level, so we add
1436 * a dummy. This is a crude hack. */
1437 if (matroska->num_levels == EBML_MAX_DEPTH) {
1438 av_log(matroska->ctx, AV_LOG_INFO,
1439 "Max EBML element depth (%d) reached, "
1440 "cannot parse further.\n", EBML_MAX_DEPTH);
1441 ret = AVERROR_INVALIDDATA;
1444 level.length = (uint64_t) -1;
1445 matroska->levels[matroska->num_levels] = level;
1446 matroska->num_levels++;
1447 matroska->current_id = 0;
1449 ret = ebml_parse(matroska, matroska_segment, matroska);
1451 /* remove dummy level */
1452 while (matroska->num_levels) {
1453 uint64_t length = matroska->levels[--matroska->num_levels].length;
1454 if (length == (uint64_t) -1)
1460 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1461 matroska->level_up = level_up;
1462 matroska->current_id = saved_id;
1467 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1469 EbmlList *seekhead_list = &matroska->seekhead;
1470 int64_t before_pos = avio_tell(matroska->ctx->pb);
1473 // we should not do any seeking in the streaming case
1474 if (!matroska->ctx->pb->seekable ||
1475 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1478 for (i = 0; i < seekhead_list->nb_elem; i++) {
1479 MatroskaSeekhead *seekhead = seekhead_list->elem;
1480 if (seekhead[i].pos <= before_pos)
1483 // defer cues parsing until we actually need cue data.
1484 if (seekhead[i].id == MATROSKA_ID_CUES) {
1485 matroska->cues_parsing_deferred = 1;
1489 if (matroska_parse_seekhead_entry(matroska, i) < 0) {
1490 // mark index as broken
1491 matroska->cues_parsing_deferred = -1;
1497 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1499 EbmlList *index_list;
1500 MatroskaIndex *index;
1501 int index_scale = 1;
1504 index_list = &matroska->index;
1505 index = index_list->elem;
1506 if (index_list->nb_elem &&
1507 index[0].time > 1E14 / matroska->time_scale) {
1508 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1509 index_scale = matroska->time_scale;
1511 for (i = 0; i < index_list->nb_elem; i++) {
1512 EbmlList *pos_list = &index[i].pos;
1513 MatroskaIndexPos *pos = pos_list->elem;
1514 for (j = 0; j < pos_list->nb_elem; j++) {
1515 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1517 if (track && track->stream)
1518 av_add_index_entry(track->stream,
1519 pos[j].pos + matroska->segment_start,
1520 index[i].time / index_scale, 0, 0,
1526 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1527 EbmlList *seekhead_list = &matroska->seekhead;
1528 MatroskaSeekhead *seekhead = seekhead_list->elem;
1531 for (i = 0; i < seekhead_list->nb_elem; i++)
1532 if (seekhead[i].id == MATROSKA_ID_CUES)
1534 av_assert1(i <= seekhead_list->nb_elem);
1536 if (matroska_parse_seekhead_entry(matroska, i) < 0)
1537 matroska->cues_parsing_deferred = -1;
1538 matroska_add_index_entries(matroska);
1541 static int matroska_aac_profile(char *codec_id)
1543 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1546 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1547 if (strstr(codec_id, aac_profiles[profile]))
1552 static int matroska_aac_sri(int samplerate)
1556 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1557 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1562 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1565 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1566 time_t creation_time = date_utc / 1000000000 + 978307200;
1567 struct tm *ptm = gmtime(&creation_time);
1569 strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
1570 av_dict_set(metadata, "creation_time", buffer, 0);
1573 static int matroska_read_header(AVFormatContext *s)
1575 MatroskaDemuxContext *matroska = s->priv_data;
1576 EbmlList *attachments_list = &matroska->attachments;
1577 EbmlList *chapters_list = &matroska->chapters;
1578 MatroskaAttachment *attachments;
1579 MatroskaChapter *chapters;
1580 MatroskaTrack *tracks;
1581 uint64_t max_start = 0;
1589 /* First read the EBML header. */
1590 if (ebml_parse(matroska, ebml_syntax, &ebml) ||
1591 ebml.version > EBML_VERSION ||
1592 ebml.max_size > sizeof(uint64_t) ||
1593 ebml.id_length > sizeof(uint32_t) ||
1594 ebml.doctype_version > 3 ||
1596 av_log(matroska->ctx, AV_LOG_ERROR,
1597 "EBML header using unsupported features\n"
1598 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1599 ebml.version, ebml.doctype, ebml.doctype_version);
1600 ebml_free(ebml_syntax, &ebml);
1601 return AVERROR_PATCHWELCOME;
1602 } else if (ebml.doctype_version == 3) {
1603 av_log(matroska->ctx, AV_LOG_WARNING,
1604 "EBML header using unsupported features\n"
1605 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1606 ebml.version, ebml.doctype, ebml.doctype_version);
1608 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1609 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1611 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1612 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1613 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
1614 ebml_free(ebml_syntax, &ebml);
1615 return AVERROR_INVALIDDATA;
1618 ebml_free(ebml_syntax, &ebml);
1620 /* The next thing is a segment. */
1621 pos = avio_tell(matroska->ctx->pb);
1622 res = ebml_parse(matroska, matroska_segments, matroska);
1623 // try resyncing until we find a EBML_STOP type element.
1625 res = matroska_resync(matroska, pos);
1628 pos = avio_tell(matroska->ctx->pb);
1629 res = ebml_parse(matroska, matroska_segment, matroska);
1631 matroska_execute_seekhead(matroska);
1633 if (!matroska->time_scale)
1634 matroska->time_scale = 1000000;
1635 if (matroska->duration)
1636 matroska->ctx->duration = matroska->duration * matroska->time_scale *
1637 1000 / AV_TIME_BASE;
1638 av_dict_set(&s->metadata, "title", matroska->title, 0);
1639 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
1641 if (matroska->date_utc.size == 8)
1642 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
1644 tracks = matroska->tracks.elem;
1645 for (i = 0; i < matroska->tracks.nb_elem; i++) {
1646 MatroskaTrack *track = &tracks[i];
1647 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1648 EbmlList *encodings_list = &track->encodings;
1649 MatroskaTrackEncoding *encodings = encodings_list->elem;
1650 uint8_t *extradata = NULL;
1651 int extradata_size = 0;
1652 int extradata_offset = 0;
1653 uint32_t fourcc = 0;
1655 char* key_id_base64 = NULL;
1658 /* Apply some sanity checks. */
1659 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1660 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1661 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1662 track->type != MATROSKA_TRACK_TYPE_METADATA) {
1663 av_log(matroska->ctx, AV_LOG_INFO,
1664 "Unknown or unsupported track type %"PRIu64"\n",
1668 if (track->codec_id == NULL)
1671 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1672 if (!track->default_duration && track->video.frame_rate > 0)
1673 track->default_duration = 1000000000 / track->video.frame_rate;
1674 if (track->video.display_width == -1)
1675 track->video.display_width = track->video.pixel_width;
1676 if (track->video.display_height == -1)
1677 track->video.display_height = track->video.pixel_height;
1678 if (track->video.color_space.size == 4)
1679 fourcc = AV_RL32(track->video.color_space.data);
1680 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1681 if (!track->audio.out_samplerate)
1682 track->audio.out_samplerate = track->audio.samplerate;
1684 if (encodings_list->nb_elem > 1) {
1685 av_log(matroska->ctx, AV_LOG_ERROR,
1686 "Multiple combined encodings not supported");
1687 } else if (encodings_list->nb_elem == 1) {
1688 if (encodings[0].type) {
1689 if (encodings[0].encryption.key_id.size > 0) {
1690 /* Save the encryption key id to be stored later as a
1692 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1693 key_id_base64 = av_malloc(b64_size);
1694 if (key_id_base64 == NULL)
1695 return AVERROR(ENOMEM);
1697 av_base64_encode(key_id_base64, b64_size,
1698 encodings[0].encryption.key_id.data,
1699 encodings[0].encryption.key_id.size);
1701 encodings[0].scope = 0;
1702 av_log(matroska->ctx, AV_LOG_ERROR,
1703 "Unsupported encoding type");
1707 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1710 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1713 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1715 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
1716 encodings[0].scope = 0;
1717 av_log(matroska->ctx, AV_LOG_ERROR,
1718 "Unsupported encoding type");
1719 } else if (track->codec_priv.size && encodings[0].scope & 2) {
1720 uint8_t *codec_priv = track->codec_priv.data;
1721 int ret = matroska_decode_buffer(&track->codec_priv.data,
1722 &track->codec_priv.size,
1725 track->codec_priv.data = NULL;
1726 track->codec_priv.size = 0;
1727 av_log(matroska->ctx, AV_LOG_ERROR,
1728 "Failed to decode codec private data\n");
1731 if (codec_priv != track->codec_priv.data)
1732 av_free(codec_priv);
1736 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1737 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1738 strlen(ff_mkv_codec_tags[j].str))) {
1739 codec_id = ff_mkv_codec_tags[j].id;
1744 st = track->stream = avformat_new_stream(s, NULL);
1746 av_free(key_id_base64);
1747 return AVERROR(ENOMEM);
1750 if (key_id_base64) {
1751 /* export encryption key id as base64 metadata tag */
1752 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1753 av_freep(&key_id_base64);
1756 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1757 track->codec_priv.size >= 40 &&
1758 track->codec_priv.data != NULL) {
1759 track->ms_compat = 1;
1760 bit_depth = AV_RL16(track->codec_priv.data + 14);
1761 fourcc = AV_RL32(track->codec_priv.data + 16);
1762 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
1765 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
1767 extradata_offset = 40;
1768 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1769 track->codec_priv.size >= 14 &&
1770 track->codec_priv.data != NULL) {
1772 ffio_init_context(&b, track->codec_priv.data,
1773 track->codec_priv.size,
1774 0, NULL, NULL, NULL, NULL);
1775 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1778 codec_id = st->codec->codec_id;
1779 extradata_offset = FFMIN(track->codec_priv.size, 18);
1780 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1781 && (track->codec_priv.size >= 86)
1782 && (track->codec_priv.data != NULL)) {
1783 fourcc = AV_RL32(track->codec_priv.data + 4);
1784 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1785 if (ff_codec_get_id(ff_codec_movaudio_tags, AV_RL32(track->codec_priv.data))) {
1786 fourcc = AV_RL32(track->codec_priv.data);
1787 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1789 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1790 (track->codec_priv.size >= 21) &&
1791 (track->codec_priv.data != NULL)) {
1792 fourcc = AV_RL32(track->codec_priv.data + 4);
1793 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1794 if (ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(track->codec_priv.data))) {
1795 fourcc = AV_RL32(track->codec_priv.data);
1796 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1798 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1799 codec_id = AV_CODEC_ID_SVQ3;
1800 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1801 switch (track->audio.bitdepth) {
1803 codec_id = AV_CODEC_ID_PCM_U8;
1806 codec_id = AV_CODEC_ID_PCM_S24BE;
1809 codec_id = AV_CODEC_ID_PCM_S32BE;
1812 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1813 switch (track->audio.bitdepth) {
1815 codec_id = AV_CODEC_ID_PCM_U8;
1818 codec_id = AV_CODEC_ID_PCM_S24LE;
1821 codec_id = AV_CODEC_ID_PCM_S32LE;
1824 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1825 track->audio.bitdepth == 64) {
1826 codec_id = AV_CODEC_ID_PCM_F64LE;
1827 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1828 int profile = matroska_aac_profile(track->codec_id);
1829 int sri = matroska_aac_sri(track->audio.samplerate);
1830 extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1831 if (extradata == NULL)
1832 return AVERROR(ENOMEM);
1833 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1834 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1835 if (strstr(track->codec_id, "SBR")) {
1836 sri = matroska_aac_sri(track->audio.out_samplerate);
1837 extradata[2] = 0x56;
1838 extradata[3] = 0xE5;
1839 extradata[4] = 0x80 | (sri << 3);
1843 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1844 /* Only ALAC's magic cookie is stored in Matroska's track headers.
1845 * Create the "atom size", "tag", and "tag version" fields the
1846 * decoder expects manually. */
1847 extradata_size = 12 + track->codec_priv.size;
1848 extradata = av_mallocz(extradata_size +
1849 FF_INPUT_BUFFER_PADDING_SIZE);
1850 if (extradata == NULL)
1851 return AVERROR(ENOMEM);
1852 AV_WB32(extradata, extradata_size);
1853 memcpy(&extradata[4], "alac", 4);
1854 AV_WB32(&extradata[8], 0);
1855 memcpy(&extradata[12], track->codec_priv.data,
1856 track->codec_priv.size);
1857 } else if (codec_id == AV_CODEC_ID_TTA) {
1858 extradata_size = 30;
1859 extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1860 if (extradata == NULL)
1861 return AVERROR(ENOMEM);
1862 ffio_init_context(&b, extradata, extradata_size, 1,
1863 NULL, NULL, NULL, NULL);
1864 avio_write(&b, "TTA1", 4);
1866 avio_wl16(&b, track->audio.channels);
1867 avio_wl16(&b, track->audio.bitdepth);
1868 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1869 return AVERROR_INVALIDDATA;
1870 avio_wl32(&b, track->audio.out_samplerate);
1871 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1872 track->audio.out_samplerate,
1873 AV_TIME_BASE * 1000));
1874 } else if (codec_id == AV_CODEC_ID_RV10 ||
1875 codec_id == AV_CODEC_ID_RV20 ||
1876 codec_id == AV_CODEC_ID_RV30 ||
1877 codec_id == AV_CODEC_ID_RV40) {
1878 extradata_offset = 26;
1879 } else if (codec_id == AV_CODEC_ID_RA_144) {
1880 track->audio.out_samplerate = 8000;
1881 track->audio.channels = 1;
1882 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1883 codec_id == AV_CODEC_ID_COOK ||
1884 codec_id == AV_CODEC_ID_ATRAC3 ||
1885 codec_id == AV_CODEC_ID_SIPR)
1886 && track->codec_priv.data) {
1889 ffio_init_context(&b, track->codec_priv.data,
1890 track->codec_priv.size,
1891 0, NULL, NULL, NULL, NULL);
1893 flavor = avio_rb16(&b);
1894 track->audio.coded_framesize = avio_rb32(&b);
1896 track->audio.sub_packet_h = avio_rb16(&b);
1897 track->audio.frame_size = avio_rb16(&b);
1898 track->audio.sub_packet_size = avio_rb16(&b);
1900 track->audio.coded_framesize <= 0 ||
1901 track->audio.sub_packet_h <= 0 ||
1902 track->audio.frame_size <= 0 ||
1903 track->audio.sub_packet_size <= 0)
1904 return AVERROR_INVALIDDATA;
1905 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1906 track->audio.frame_size);
1907 if (!track->audio.buf)
1908 return AVERROR(ENOMEM);
1909 if (codec_id == AV_CODEC_ID_RA_288) {
1910 st->codec->block_align = track->audio.coded_framesize;
1911 track->codec_priv.size = 0;
1913 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1914 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1915 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1916 st->codec->bit_rate = sipr_bit_rate[flavor];
1918 st->codec->block_align = track->audio.sub_packet_size;
1919 extradata_offset = 78;
1921 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1922 fourcc = AV_RL32(track->codec_priv.data);
1924 track->codec_priv.size -= extradata_offset;
1926 if (codec_id == AV_CODEC_ID_NONE)
1927 av_log(matroska->ctx, AV_LOG_INFO,
1928 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1930 if (track->time_scale < 0.01)
1931 track->time_scale = 1.0;
1932 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1933 1000 * 1000 * 1000); /* 64 bit pts in ns */
1935 /* convert the delay from ns to the track timebase */
1936 track->codec_delay = av_rescale_q(track->codec_delay,
1937 (AVRational){ 1, 1000000000 },
1940 st->codec->codec_id = codec_id;
1942 if (strcmp(track->language, "und"))
1943 av_dict_set(&st->metadata, "language", track->language, 0);
1944 av_dict_set(&st->metadata, "title", track->name, 0);
1946 if (track->flag_default)
1947 st->disposition |= AV_DISPOSITION_DEFAULT;
1948 if (track->flag_forced)
1949 st->disposition |= AV_DISPOSITION_FORCED;
1951 if (!st->codec->extradata) {
1953 st->codec->extradata = extradata;
1954 st->codec->extradata_size = extradata_size;
1955 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1956 if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1957 return AVERROR(ENOMEM);
1958 memcpy(st->codec->extradata,
1959 track->codec_priv.data + extradata_offset,
1960 track->codec_priv.size);
1964 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1965 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1967 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1968 st->codec->codec_tag = fourcc;
1970 st->codec->bits_per_coded_sample = bit_depth;
1971 st->codec->width = track->video.pixel_width;
1972 st->codec->height = track->video.pixel_height;
1973 av_reduce(&st->sample_aspect_ratio.num,
1974 &st->sample_aspect_ratio.den,
1975 st->codec->height * track->video.display_width,
1976 st->codec->width * track->video.display_height,
1978 if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1979 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1981 if (track->default_duration) {
1982 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1983 1000000000, track->default_duration, 30000);
1984 #if FF_API_R_FRAME_RATE
1985 if (st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L)
1986 st->r_frame_rate = st->avg_frame_rate;
1990 /* export stereo mode flag as metadata tag */
1991 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREO_MODE_COUNT)
1992 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
1994 /* export alpha mode flag as metadata tag */
1995 if (track->video.alpha_mode)
1996 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
1998 /* if we have virtual track, mark the real tracks */
1999 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2001 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2003 snprintf(buf, sizeof(buf), "%s_%d",
2004 ff_matroska_video_stereo_plane[planes[j].type], i);
2005 for (k=0; k < matroska->tracks.nb_elem; k++)
2006 if (planes[j].uid == tracks[k].uid) {
2007 av_dict_set(&s->streams[k]->metadata,
2008 "stereo_mode", buf, 0);
2012 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2013 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
2014 st->codec->sample_rate = track->audio.out_samplerate;
2015 st->codec->channels = track->audio.channels;
2016 if (!st->codec->bits_per_coded_sample)
2017 st->codec->bits_per_coded_sample = track->audio.bitdepth;
2018 if (st->codec->codec_id != AV_CODEC_ID_AAC)
2019 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2020 if (track->codec_delay > 0) {
2021 st->codec->delay = av_rescale_q(track->codec_delay,
2023 (AVRational){1, st->codec->sample_rate});
2025 if (track->seek_preroll > 0) {
2026 av_codec_set_seek_preroll(st->codec,
2027 av_rescale_q(track->seek_preroll,
2028 (AVRational){1, 1000000000},
2029 (AVRational){1, st->codec->sample_rate}));
2031 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2032 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2034 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2035 st->disposition |= AV_DISPOSITION_CAPTIONS;
2036 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2037 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2038 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2039 st->disposition |= AV_DISPOSITION_METADATA;
2041 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2042 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2044 if (st->codec->codec_id == AV_CODEC_ID_SSA ||
2045 st->codec->codec_id == AV_CODEC_ID_ASS)
2047 if (st->codec->codec_id == AV_CODEC_ID_ASS)
2049 matroska->contains_ssa = 1;
2053 attachments = attachments_list->elem;
2054 for (j = 0; j < attachments_list->nb_elem; j++) {
2055 if (!(attachments[j].filename && attachments[j].mime &&
2056 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2057 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2059 AVStream *st = avformat_new_stream(s, NULL);
2062 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2063 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2064 st->codec->codec_id = AV_CODEC_ID_NONE;
2065 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2066 if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2068 memcpy(st->codec->extradata, attachments[j].bin.data,
2069 attachments[j].bin.size);
2071 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2072 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2073 strlen(ff_mkv_mime_tags[i].str))) {
2074 st->codec->codec_id = ff_mkv_mime_tags[i].id;
2078 attachments[j].stream = st;
2082 chapters = chapters_list->elem;
2083 for (i = 0; i < chapters_list->nb_elem; i++)
2084 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2085 (max_start == 0 || chapters[i].start > max_start)) {
2086 chapters[i].chapter =
2087 avpriv_new_chapter(s, chapters[i].uid,
2088 (AVRational) { 1, 1000000000 },
2089 chapters[i].start, chapters[i].end,
2091 av_dict_set(&chapters[i].chapter->metadata,
2092 "title", chapters[i].title, 0);
2093 max_start = chapters[i].start;
2096 matroska_add_index_entries(matroska);
2098 matroska_convert_tags(s);
2104 * Put one packet in an application-supplied AVPacket struct.
2105 * Returns 0 on success or -1 on failure.
2107 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2110 if (matroska->num_packets > 0) {
2111 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2112 av_free(matroska->packets[0]);
2113 if (matroska->num_packets > 1) {
2115 memmove(&matroska->packets[0], &matroska->packets[1],
2116 (matroska->num_packets - 1) * sizeof(AVPacket *));
2117 newpackets = av_realloc(matroska->packets,
2118 (matroska->num_packets - 1) *
2119 sizeof(AVPacket *));
2121 matroska->packets = newpackets;
2123 av_freep(&matroska->packets);
2124 matroska->prev_pkt = NULL;
2126 matroska->num_packets--;
2134 * Free all packets in our internal queue.
2136 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2138 matroska->prev_pkt = NULL;
2139 if (matroska->packets) {
2141 for (n = 0; n < matroska->num_packets; n++) {
2142 av_free_packet(matroska->packets[n]);
2143 av_free(matroska->packets[n]);
2145 av_freep(&matroska->packets);
2146 matroska->num_packets = 0;
2150 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2151 int *buf_size, int type,
2152 uint32_t **lace_buf, int *laces)
2154 int res = 0, n, size = *buf_size;
2155 uint8_t *data = *buf;
2156 uint32_t *lace_size;
2160 *lace_buf = av_mallocz(sizeof(int));
2162 return AVERROR(ENOMEM);
2164 *lace_buf[0] = size;
2168 av_assert0(size > 0);
2172 lace_size = av_mallocz(*laces * sizeof(int));
2174 return AVERROR(ENOMEM);
2177 case 0x1: /* Xiph lacing */
2181 for (n = 0; res == 0 && n < *laces - 1; n++) {
2183 if (size <= total) {
2184 res = AVERROR_INVALIDDATA;
2189 lace_size[n] += temp;
2196 if (size <= total) {
2197 res = AVERROR_INVALIDDATA;
2201 lace_size[n] = size - total;
2205 case 0x2: /* fixed-size lacing */
2206 if (size % (*laces)) {
2207 res = AVERROR_INVALIDDATA;
2210 for (n = 0; n < *laces; n++)
2211 lace_size[n] = size / *laces;
2214 case 0x3: /* EBML lacing */
2218 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2219 if (n < 0 || num > INT_MAX) {
2220 av_log(matroska->ctx, AV_LOG_INFO,
2221 "EBML block data error\n");
2222 res = n<0 ? n : AVERROR_INVALIDDATA;
2227 total = lace_size[0] = num;
2228 for (n = 1; res == 0 && n < *laces - 1; n++) {
2231 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2232 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2233 av_log(matroska->ctx, AV_LOG_INFO,
2234 "EBML block data error\n");
2235 res = r<0 ? r : AVERROR_INVALIDDATA;
2240 lace_size[n] = lace_size[n - 1] + snum;
2241 total += lace_size[n];
2243 if (size <= total) {
2244 res = AVERROR_INVALIDDATA;
2247 lace_size[*laces - 1] = size - total;
2253 *lace_buf = lace_size;
2259 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2260 MatroskaTrack *track, AVStream *st,
2261 uint8_t *data, int size, uint64_t timecode,
2264 int a = st->codec->block_align;
2265 int sps = track->audio.sub_packet_size;
2266 int cfs = track->audio.coded_framesize;
2267 int h = track->audio.sub_packet_h;
2268 int y = track->audio.sub_packet_cnt;
2269 int w = track->audio.frame_size;
2272 if (!track->audio.pkt_cnt) {
2273 if (track->audio.sub_packet_cnt == 0)
2274 track->audio.buf_timecode = timecode;
2275 if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2276 if (size < cfs * h / 2) {
2277 av_log(matroska->ctx, AV_LOG_ERROR,
2278 "Corrupt int4 RM-style audio packet size\n");
2279 return AVERROR_INVALIDDATA;
2281 for (x = 0; x < h / 2; x++)
2282 memcpy(track->audio.buf + x * 2 * w + y * cfs,
2283 data + x * cfs, cfs);
2284 } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2286 av_log(matroska->ctx, AV_LOG_ERROR,
2287 "Corrupt sipr RM-style audio packet size\n");
2288 return AVERROR_INVALIDDATA;
2290 memcpy(track->audio.buf + y * w, data, w);
2292 if (size < sps * w / sps || h<=0 || w%sps) {
2293 av_log(matroska->ctx, AV_LOG_ERROR,
2294 "Corrupt generic RM-style audio packet size\n");
2295 return AVERROR_INVALIDDATA;
2297 for (x = 0; x < w / sps; x++)
2298 memcpy(track->audio.buf +
2299 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2300 data + x * sps, sps);
2303 if (++track->audio.sub_packet_cnt >= h) {
2304 if (st->codec->codec_id == AV_CODEC_ID_SIPR)
2305 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2306 track->audio.sub_packet_cnt = 0;
2307 track->audio.pkt_cnt = h * w / a;
2311 while (track->audio.pkt_cnt) {
2312 AVPacket *pkt = NULL;
2313 if (!(pkt = av_mallocz(sizeof(AVPacket))) || av_new_packet(pkt, a) < 0) {
2315 return AVERROR(ENOMEM);
2318 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2320 pkt->pts = track->audio.buf_timecode;
2321 track->audio.buf_timecode = AV_NOPTS_VALUE;
2323 pkt->stream_index = st->index;
2324 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2330 /* reconstruct full wavpack blocks from mangled matroska ones */
2331 static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
2332 uint8_t **pdst, int *size)
2334 uint8_t *dst = NULL;
2339 int ret, offset = 0;
2341 if (srclen < 12 || track->stream->codec->extradata_size < 2)
2342 return AVERROR_INVALIDDATA;
2344 ver = AV_RL16(track->stream->codec->extradata);
2346 samples = AV_RL32(src);
2350 while (srclen >= 8) {
2355 uint32_t flags = AV_RL32(src);
2356 uint32_t crc = AV_RL32(src + 4);
2360 multiblock = (flags & 0x1800) != 0x1800;
2363 ret = AVERROR_INVALIDDATA;
2366 blocksize = AV_RL32(src);
2372 if (blocksize > srclen) {
2373 ret = AVERROR_INVALIDDATA;
2377 tmp = av_realloc(dst, dstlen + blocksize + 32);
2379 ret = AVERROR(ENOMEM);
2383 dstlen += blocksize + 32;
2385 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2386 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2387 AV_WL16(dst + offset + 8, ver); // version
2388 AV_WL16(dst + offset + 10, 0); // track/index_no
2389 AV_WL32(dst + offset + 12, 0); // total samples
2390 AV_WL32(dst + offset + 16, 0); // block index
2391 AV_WL32(dst + offset + 20, samples); // number of samples
2392 AV_WL32(dst + offset + 24, flags); // flags
2393 AV_WL32(dst + offset + 28, crc); // crc
2394 memcpy(dst + offset + 32, src, blocksize); // block data
2397 srclen -= blocksize;
2398 offset += blocksize + 32;
2411 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
2412 MatroskaTrack *track,
2414 uint8_t *data, int data_len,
2420 uint8_t *id, *settings, *text, *buf;
2421 int id_len, settings_len, text_len;
2426 return AVERROR_INVALIDDATA;
2429 q = data + data_len;
2434 if (*p == '\r' || *p == '\n') {
2443 if (p >= q || *p != '\n')
2444 return AVERROR_INVALIDDATA;
2450 if (*p == '\r' || *p == '\n') {
2451 settings_len = p - settings;
2459 if (p >= q || *p != '\n')
2460 return AVERROR_INVALIDDATA;
2465 while (text_len > 0) {
2466 const int len = text_len - 1;
2467 const uint8_t c = p[len];
2468 if (c != '\r' && c != '\n')
2474 return AVERROR_INVALIDDATA;
2476 pkt = av_mallocz(sizeof(*pkt));
2477 err = av_new_packet(pkt, text_len);
2480 return AVERROR(err);
2483 memcpy(pkt->data, text, text_len);
2486 buf = av_packet_new_side_data(pkt,
2487 AV_PKT_DATA_WEBVTT_IDENTIFIER,
2491 return AVERROR(ENOMEM);
2493 memcpy(buf, id, id_len);
2496 if (settings_len > 0) {
2497 buf = av_packet_new_side_data(pkt,
2498 AV_PKT_DATA_WEBVTT_SETTINGS,
2502 return AVERROR(ENOMEM);
2504 memcpy(buf, settings, settings_len);
2507 // Do we need this for subtitles?
2508 // pkt->flags = AV_PKT_FLAG_KEY;
2510 pkt->stream_index = st->index;
2511 pkt->pts = timecode;
2513 // Do we need this for subtitles?
2514 // pkt->dts = timecode;
2516 pkt->duration = duration;
2519 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2520 matroska->prev_pkt = pkt;
2525 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2526 MatroskaTrack *track, AVStream *st,
2527 uint8_t *data, int pkt_size,
2528 uint64_t timecode, uint64_t lace_duration,
2529 int64_t pos, int is_keyframe,
2530 uint8_t *additional, uint64_t additional_id, int additional_size,
2531 int64_t discard_padding)
2533 MatroskaTrackEncoding *encodings = track->encodings.elem;
2534 uint8_t *pkt_data = data;
2535 int offset = 0, res;
2538 if (encodings && !encodings->type && encodings->scope & 1) {
2539 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2544 if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2546 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2548 av_log(matroska->ctx, AV_LOG_ERROR,
2549 "Error parsing a wavpack block.\n");
2552 if (pkt_data != data)
2553 av_freep(&pkt_data);
2557 if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2558 AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2561 pkt = av_mallocz(sizeof(AVPacket));
2562 /* XXX: prevent data copy... */
2563 if (av_new_packet(pkt, pkt_size + offset) < 0) {
2565 res = AVERROR(ENOMEM);
2569 if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2570 uint8_t *buf = pkt->data;
2571 bytestream_put_be32(&buf, pkt_size);
2572 bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2575 memcpy(pkt->data + offset, pkt_data, pkt_size);
2577 if (pkt_data != data)
2578 av_freep(&pkt_data);
2580 pkt->flags = is_keyframe;
2581 pkt->stream_index = st->index;
2583 if (additional_size > 0) {
2584 uint8_t *side_data = av_packet_new_side_data(pkt,
2585 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2586 additional_size + 8);
2587 if (side_data == NULL) {
2588 av_free_packet(pkt);
2590 return AVERROR(ENOMEM);
2592 AV_WB64(side_data, additional_id);
2593 memcpy(side_data + 8, additional, additional_size);
2596 if (discard_padding) {
2597 uint8_t *side_data = av_packet_new_side_data(pkt,
2598 AV_PKT_DATA_SKIP_SAMPLES,
2600 if (side_data == NULL) {
2601 av_free_packet(pkt);
2603 return AVERROR(ENOMEM);
2605 AV_WL32(side_data, 0);
2606 AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2607 (AVRational){1, 1000000000},
2608 (AVRational){1, st->codec->sample_rate}));
2611 if (track->ms_compat)
2612 pkt->dts = timecode;
2614 pkt->pts = timecode;
2616 if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2618 * For backward compatibility.
2619 * Historically, we have put subtitle duration
2620 * in convergence_duration, on the off chance
2621 * that the time_scale is less than 1us, which
2622 * could result in a 32bit overflow on the
2623 * normal duration field.
2625 pkt->convergence_duration = lace_duration;
2628 if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2629 lace_duration <= INT_MAX) {
2631 * For non subtitle tracks, just store the duration
2634 * If it's a subtitle track and duration value does
2635 * not overflow a uint32, then also store it normally.
2637 pkt->duration = lace_duration;
2641 if (st->codec->codec_id == AV_CODEC_ID_SSA)
2642 matroska_fix_ass_packet(matroska, pkt, lace_duration);
2644 if (matroska->prev_pkt &&
2645 timecode != AV_NOPTS_VALUE &&
2646 matroska->prev_pkt->pts == timecode &&
2647 matroska->prev_pkt->stream_index == st->index &&
2648 st->codec->codec_id == AV_CODEC_ID_SSA)
2649 matroska_merge_packets(matroska->prev_pkt, pkt);
2651 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2652 matroska->prev_pkt = pkt;
2655 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2656 matroska->prev_pkt = pkt;
2662 if (pkt_data != data)
2663 av_freep(&pkt_data);
2667 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2668 int size, int64_t pos, uint64_t cluster_time,
2669 uint64_t block_duration, int is_keyframe,
2670 uint8_t *additional, uint64_t additional_id, int additional_size,
2671 int64_t cluster_pos, int64_t discard_padding)
2673 uint64_t timecode = AV_NOPTS_VALUE;
2674 MatroskaTrack *track;
2678 uint32_t *lace_size = NULL;
2679 int n, flags, laces = 0;
2681 int trust_default_duration = 1;
2683 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2684 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2690 track = matroska_find_track_by_num(matroska, num);
2691 if (!track || !track->stream) {
2692 av_log(matroska->ctx, AV_LOG_INFO,
2693 "Invalid stream %"PRIu64" or size %u\n", num, size);
2694 return AVERROR_INVALIDDATA;
2695 } else if (size <= 3)
2698 if (st->discard >= AVDISCARD_ALL)
2700 av_assert1(block_duration != AV_NOPTS_VALUE);
2702 block_time = sign_extend(AV_RB16(data), 16);
2706 if (is_keyframe == -1)
2707 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2709 if (cluster_time != (uint64_t) -1 &&
2710 (block_time >= 0 || cluster_time >= -block_time)) {
2711 timecode = cluster_time + block_time - track->codec_delay;
2712 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2713 timecode < track->end_timecode)
2714 is_keyframe = 0; /* overlapping subtitles are not key frame */
2716 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2720 if (matroska->skip_to_keyframe &&
2721 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2722 if (timecode < matroska->skip_to_timecode)
2725 matroska->skip_to_keyframe = 0;
2726 else if (!st->skip_to_keyframe) {
2727 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2728 matroska->skip_to_keyframe = 0;
2732 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2733 &lace_size, &laces);
2738 if (track->audio.samplerate == 8000) {
2739 // If this is needed for more codecs, then add them here
2740 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2741 if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2742 trust_default_duration = 0;
2746 if (!block_duration && trust_default_duration)
2747 block_duration = track->default_duration * laces / matroska->time_scale;
2749 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2750 track->end_timecode =
2751 FFMAX(track->end_timecode, timecode + block_duration);
2753 for (n = 0; n < laces; n++) {
2754 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2756 if (lace_size[n] > size) {
2757 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2761 if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2762 st->codec->codec_id == AV_CODEC_ID_COOK ||
2763 st->codec->codec_id == AV_CODEC_ID_SIPR ||
2764 st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2765 st->codec->block_align && track->audio.sub_packet_size) {
2766 res = matroska_parse_rm_audio(matroska, track, st, data,
2772 } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2773 res = matroska_parse_webvtt(matroska, track, st,
2775 timecode, lace_duration,
2780 res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2781 timecode, lace_duration, pos,
2782 !n ? is_keyframe : 0,
2783 additional, additional_id, additional_size,
2789 if (timecode != AV_NOPTS_VALUE)
2790 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2791 data += lace_size[n];
2792 size -= lace_size[n];
2800 static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2802 EbmlList *blocks_list;
2803 MatroskaBlock *blocks;
2805 res = ebml_parse(matroska,
2806 matroska_cluster_incremental_parsing,
2807 &matroska->current_cluster);
2810 if (matroska->current_cluster_pos)
2811 ebml_level_end(matroska);
2812 ebml_free(matroska_cluster, &matroska->current_cluster);
2813 memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2814 matroska->current_cluster_num_blocks = 0;
2815 matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2816 matroska->prev_pkt = NULL;
2817 /* sizeof the ID which was already read */
2818 if (matroska->current_id)
2819 matroska->current_cluster_pos -= 4;
2820 res = ebml_parse(matroska,
2821 matroska_clusters_incremental,
2822 &matroska->current_cluster);
2823 /* Try parsing the block again. */
2825 res = ebml_parse(matroska,
2826 matroska_cluster_incremental_parsing,
2827 &matroska->current_cluster);
2831 matroska->current_cluster_num_blocks <
2832 matroska->current_cluster.blocks.nb_elem) {
2833 blocks_list = &matroska->current_cluster.blocks;
2834 blocks = blocks_list->elem;
2836 matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2837 i = blocks_list->nb_elem - 1;
2838 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2839 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2840 uint8_t* additional = blocks[i].additional.size > 0 ?
2841 blocks[i].additional.data : NULL;
2842 if (!blocks[i].non_simple)
2843 blocks[i].duration = 0;
2844 res = matroska_parse_block(matroska, blocks[i].bin.data,
2845 blocks[i].bin.size, blocks[i].bin.pos,
2846 matroska->current_cluster.timecode,
2847 blocks[i].duration, is_keyframe,
2848 additional, blocks[i].additional_id,
2849 blocks[i].additional.size,
2850 matroska->current_cluster_pos,
2851 blocks[i].discard_padding);
2858 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2860 MatroskaCluster cluster = { 0 };
2861 EbmlList *blocks_list;
2862 MatroskaBlock *blocks;
2866 if (!matroska->contains_ssa)
2867 return matroska_parse_cluster_incremental(matroska);
2868 pos = avio_tell(matroska->ctx->pb);
2869 matroska->prev_pkt = NULL;
2870 if (matroska->current_id)
2871 pos -= 4; /* sizeof the ID which was already read */
2872 res = ebml_parse(matroska, matroska_clusters, &cluster);
2873 blocks_list = &cluster.blocks;
2874 blocks = blocks_list->elem;
2875 for (i = 0; i < blocks_list->nb_elem; i++)
2876 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2877 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2878 res = matroska_parse_block(matroska, blocks[i].bin.data,
2879 blocks[i].bin.size, blocks[i].bin.pos,
2880 cluster.timecode, blocks[i].duration,
2881 is_keyframe, NULL, 0, 0, pos,
2882 blocks[i].discard_padding);
2884 ebml_free(matroska_cluster, &cluster);
2888 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2890 MatroskaDemuxContext *matroska = s->priv_data;
2892 while (matroska_deliver_packet(matroska, pkt)) {
2893 int64_t pos = avio_tell(matroska->ctx->pb);
2896 if (matroska_parse_cluster(matroska) < 0)
2897 matroska_resync(matroska, pos);
2903 static int matroska_read_seek(AVFormatContext *s, int stream_index,
2904 int64_t timestamp, int flags)
2906 MatroskaDemuxContext *matroska = s->priv_data;
2907 MatroskaTrack *tracks = matroska->tracks.elem;
2908 AVStream *st = s->streams[stream_index];
2909 int i, index, index_sub, index_min;
2911 /* Parse the CUES now since we need the index data to seek. */
2912 if (matroska->cues_parsing_deferred > 0) {
2913 matroska->cues_parsing_deferred = 0;
2914 matroska_parse_cues(matroska);
2917 if (!st->nb_index_entries)
2919 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
2921 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2922 avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
2924 matroska->current_id = 0;
2925 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2926 matroska_clear_queue(matroska);
2927 if (matroska_parse_cluster(matroska) < 0)
2932 matroska_clear_queue(matroska);
2933 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
2937 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2938 tracks[i].audio.pkt_cnt = 0;
2939 tracks[i].audio.sub_packet_cnt = 0;
2940 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2941 tracks[i].end_timecode = 0;
2942 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2943 tracks[i].stream->discard != AVDISCARD_ALL) {
2944 index_sub = av_index_search_timestamp(
2945 tracks[i].stream, st->index_entries[index].timestamp,
2946 AVSEEK_FLAG_BACKWARD);
2947 while (index_sub >= 0 &&
2949 tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
2950 st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
2955 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2956 matroska->current_id = 0;
2957 if (flags & AVSEEK_FLAG_ANY) {
2958 st->skip_to_keyframe = 0;
2959 matroska->skip_to_timecode = timestamp;
2961 st->skip_to_keyframe = 1;
2962 matroska->skip_to_timecode = st->index_entries[index].timestamp;
2964 matroska->skip_to_keyframe = 1;
2966 matroska->num_levels = 0;
2967 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2970 // slightly hackish but allows proper fallback to
2971 // the generic seeking code.
2972 matroska_clear_queue(matroska);
2973 matroska->current_id = 0;
2974 st->skip_to_keyframe =
2975 matroska->skip_to_keyframe = 0;
2977 matroska->num_levels = 0;
2981 static int matroska_read_close(AVFormatContext *s)
2983 MatroskaDemuxContext *matroska = s->priv_data;
2984 MatroskaTrack *tracks = matroska->tracks.elem;
2987 matroska_clear_queue(matroska);
2989 for (n = 0; n < matroska->tracks.nb_elem; n++)
2990 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
2991 av_free(tracks[n].audio.buf);
2992 ebml_free(matroska_cluster, &matroska->current_cluster);
2993 ebml_free(matroska_segment, matroska);
2998 AVInputFormat ff_matroska_demuxer = {
2999 .name = "matroska,webm",
3000 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3001 .priv_data_size = sizeof(MatroskaDemuxContext),
3002 .read_probe = matroska_probe,
3003 .read_header = matroska_read_header,
3004 .read_packet = matroska_read_packet,
3005 .read_close = matroska_read_close,
3006 .read_seek = matroska_read_seek,