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/flac.h"
52 #include "libavcodec/mpeg4audio.h"
55 #include "avio_internal.h"
60 /* For ff_codec_get_id(). */
62 #if CONFIG_SIPR_DECODER
66 static int matroska_read_close(AVFormatContext *s);
82 typedef const struct EbmlSyntax {
91 const struct EbmlSyntax *n;
111 uint64_t doctype_version;
117 } MatroskaTrackCompression;
122 } MatroskaTrackEncryption;
127 MatroskaTrackCompression compression;
128 MatroskaTrackEncryption encryption;
129 } MatroskaTrackEncoding;
133 uint64_t display_width;
134 uint64_t display_height;
135 uint64_t pixel_width;
136 uint64_t pixel_height;
138 uint64_t stereo_mode;
140 } MatroskaTrackVideo;
144 double out_samplerate;
148 /* real audio header (extracted from extradata) */
155 uint64_t buf_timecode;
157 } MatroskaTrackAudio;
162 } MatroskaTrackPlane;
165 EbmlList combine_planes;
166 } MatroskaTrackOperation;
177 uint64_t default_duration;
178 uint64_t flag_default;
179 uint64_t flag_forced;
180 uint64_t seek_preroll;
181 MatroskaTrackVideo video;
182 MatroskaTrackAudio audio;
183 MatroskaTrackOperation operation;
185 uint64_t codec_delay;
188 int64_t end_timecode;
190 uint64_t max_block_additional_id;
200 } MatroskaAttachment;
238 MatroskaTagTarget target;
258 AVFormatContext *ctx;
262 MatroskaLevel levels[EBML_MAX_DEPTH];
272 EbmlList attachments;
278 /* byte position of the segment inside the stream */
279 int64_t segment_start;
281 /* the packet queue */
288 /* What to skip before effectively reading a packet. */
289 int skip_to_keyframe;
290 uint64_t skip_to_timecode;
292 /* File has a CUES element, but we defer parsing until it is needed. */
293 int cues_parsing_deferred;
295 int current_cluster_num_blocks;
296 int64_t current_cluster_pos;
297 MatroskaCluster current_cluster;
299 /* File has SSA subtitles which prevent incremental cluster parsing. */
301 } MatroskaDemuxContext;
308 uint64_t additional_id;
310 int64_t discard_padding;
313 static EbmlSyntax ebml_header[] = {
314 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
315 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
316 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
317 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
318 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
319 { EBML_ID_EBMLVERSION, EBML_NONE },
320 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
324 static EbmlSyntax ebml_syntax[] = {
325 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
329 static EbmlSyntax matroska_info[] = {
330 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
331 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
332 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
333 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
334 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
335 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
336 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
340 static EbmlSyntax matroska_track_video[] = {
341 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
342 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
343 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
344 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
345 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
346 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
347 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode) },
348 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
349 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
350 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
351 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
352 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
353 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
354 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
355 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
359 static EbmlSyntax matroska_track_audio[] = {
360 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
361 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
362 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
363 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
367 static EbmlSyntax matroska_track_encoding_compression[] = {
368 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
369 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
373 static EbmlSyntax matroska_track_encoding_encryption[] = {
374 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
375 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
376 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
377 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
378 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
379 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
380 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
383 static EbmlSyntax matroska_track_encoding[] = {
384 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
385 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
386 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
387 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
388 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
392 static EbmlSyntax matroska_track_encodings[] = {
393 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
397 static EbmlSyntax matroska_track_plane[] = {
398 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
399 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
403 static EbmlSyntax matroska_track_combine_planes[] = {
404 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
408 static EbmlSyntax matroska_track_operation[] = {
409 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
413 static EbmlSyntax matroska_track[] = {
414 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
415 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
416 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
417 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
418 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
419 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
420 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
421 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
422 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
423 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
424 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
425 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
426 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
427 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
428 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
429 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
430 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
431 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
432 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
433 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
434 { MATROSKA_ID_CODECNAME, EBML_NONE },
435 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
436 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
437 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
438 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
439 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
443 static EbmlSyntax matroska_tracks[] = {
444 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
448 static EbmlSyntax matroska_attachment[] = {
449 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
450 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
451 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
452 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
453 { MATROSKA_ID_FILEDESC, EBML_NONE },
457 static EbmlSyntax matroska_attachments[] = {
458 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
462 static EbmlSyntax matroska_chapter_display[] = {
463 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
464 { MATROSKA_ID_CHAPLANG, EBML_NONE },
468 static EbmlSyntax matroska_chapter_entry[] = {
469 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
470 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
471 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
472 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
473 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
474 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
475 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
476 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
480 static EbmlSyntax matroska_chapter[] = {
481 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
482 { MATROSKA_ID_EDITIONUID, EBML_NONE },
483 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
484 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
485 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
489 static EbmlSyntax matroska_chapters[] = {
490 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
494 static EbmlSyntax matroska_index_pos[] = {
495 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
496 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
497 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
498 { MATROSKA_ID_CUEDURATION, EBML_NONE },
499 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
503 static EbmlSyntax matroska_index_entry[] = {
504 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
505 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
509 static EbmlSyntax matroska_index[] = {
510 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
514 static EbmlSyntax matroska_simpletag[] = {
515 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
516 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
517 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
518 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
519 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
520 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
524 static EbmlSyntax matroska_tagtargets[] = {
525 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
526 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
527 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
528 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
529 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
533 static EbmlSyntax matroska_tag[] = {
534 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
535 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
539 static EbmlSyntax matroska_tags[] = {
540 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
544 static EbmlSyntax matroska_seekhead_entry[] = {
545 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
546 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
550 static EbmlSyntax matroska_seekhead[] = {
551 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
555 static EbmlSyntax matroska_segment[] = {
556 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } },
557 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } },
558 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } },
559 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } },
560 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } },
561 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } },
562 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } },
563 { MATROSKA_ID_CLUSTER, EBML_STOP },
567 static EbmlSyntax matroska_segments[] = {
568 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
572 static EbmlSyntax matroska_blockmore[] = {
573 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
574 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
578 static EbmlSyntax matroska_blockadditions[] = {
579 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
583 static EbmlSyntax matroska_blockgroup[] = {
584 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
585 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
586 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
587 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
588 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
589 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
590 { MATROSKA_ID_CODECSTATE, EBML_NONE },
591 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
595 static EbmlSyntax matroska_cluster[] = {
596 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
597 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
598 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
599 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
600 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
604 static EbmlSyntax matroska_clusters[] = {
605 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
606 { MATROSKA_ID_INFO, EBML_NONE },
607 { MATROSKA_ID_CUES, EBML_NONE },
608 { MATROSKA_ID_TAGS, EBML_NONE },
609 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
613 static EbmlSyntax matroska_cluster_incremental_parsing[] = {
614 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
615 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
616 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
617 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
618 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
619 { MATROSKA_ID_INFO, EBML_NONE },
620 { MATROSKA_ID_CUES, EBML_NONE },
621 { MATROSKA_ID_TAGS, EBML_NONE },
622 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
623 { MATROSKA_ID_CLUSTER, EBML_STOP },
627 static EbmlSyntax matroska_cluster_incremental[] = {
628 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
629 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
630 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
631 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
632 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
636 static EbmlSyntax matroska_clusters_incremental[] = {
637 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
638 { MATROSKA_ID_INFO, EBML_NONE },
639 { MATROSKA_ID_CUES, EBML_NONE },
640 { MATROSKA_ID_TAGS, EBML_NONE },
641 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
645 static const char *const matroska_doctypes[] = { "matroska", "webm" };
647 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
649 AVIOContext *pb = matroska->ctx->pb;
651 matroska->current_id = 0;
652 matroska->num_levels = 0;
654 /* seek to next position to resync from */
655 if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
660 // try to find a toplevel element
661 while (!url_feof(pb)) {
662 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
663 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
664 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
665 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
666 matroska->current_id = id;
669 id = (id << 8) | avio_r8(pb);
678 * Return: Whether we reached the end of a level in the hierarchy or not.
680 static int ebml_level_end(MatroskaDemuxContext *matroska)
682 AVIOContext *pb = matroska->ctx->pb;
683 int64_t pos = avio_tell(pb);
685 if (matroska->num_levels > 0) {
686 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
687 if (pos - level->start >= level->length || matroska->current_id) {
688 matroska->num_levels--;
696 * Read: an "EBML number", which is defined as a variable-length
697 * array of bytes. The first byte indicates the length by giving a
698 * number of 0-bits followed by a one. The position of the first
699 * "one" bit inside the first byte indicates the length of this
701 * Returns: number of bytes read, < 0 on error
703 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
704 int max_size, uint64_t *number)
709 /* The first byte tells us the length in bytes - avio_r8() can normally
710 * return 0, but since that's not a valid first ebmlID byte, we can
711 * use it safely here to catch EOS. */
712 if (!(total = avio_r8(pb))) {
713 /* we might encounter EOS here */
715 int64_t pos = avio_tell(pb);
716 av_log(matroska->ctx, AV_LOG_ERROR,
717 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
719 return pb->error ? pb->error : AVERROR(EIO);
724 /* get the length of the EBML number */
725 read = 8 - ff_log2_tab[total];
726 if (read > max_size) {
727 int64_t pos = avio_tell(pb) - 1;
728 av_log(matroska->ctx, AV_LOG_ERROR,
729 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
730 (uint8_t) total, pos, pos);
731 return AVERROR_INVALIDDATA;
734 /* read out length */
735 total ^= 1 << ff_log2_tab[total];
737 total = (total << 8) | avio_r8(pb);
745 * Read a EBML length value.
746 * This needs special handling for the "unknown length" case which has multiple
749 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
752 int res = ebml_read_num(matroska, pb, 8, number);
753 if (res > 0 && *number + 1 == 1ULL << (7 * res))
754 *number = 0xffffffffffffffULL;
759 * Read the next element as an unsigned int.
760 * 0 is success, < 0 is failure.
762 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
767 return AVERROR_INVALIDDATA;
769 /* big-endian ordering; build up number */
772 *num = (*num << 8) | avio_r8(pb);
778 * Read the next element as a signed int.
779 * 0 is success, < 0 is failure.
781 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
786 return AVERROR_INVALIDDATA;
791 *num = sign_extend(avio_r8(pb), 8);
793 /* big-endian ordering; build up number */
795 *num = (*num << 8) | avio_r8(pb);
802 * Read the next element as a float.
803 * 0 is success, < 0 is failure.
805 static int ebml_read_float(AVIOContext *pb, int size, double *num)
810 *num = av_int2float(avio_rb32(pb));
812 *num = av_int2double(avio_rb64(pb));
814 return AVERROR_INVALIDDATA;
820 * Read the next element as an ASCII string.
821 * 0 is success, < 0 is failure.
823 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
827 /* EBML strings are usually not 0-terminated, so we allocate one
828 * byte more, read the string and NULL-terminate it ourselves. */
829 if (!(res = av_malloc(size + 1)))
830 return AVERROR(ENOMEM);
831 if (avio_read(pb, (uint8_t *) res, size) != size) {
843 * Read the next element as binary data.
844 * 0 is success, < 0 is failure.
846 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
848 av_fast_padded_malloc(&bin->data, &bin->size, length);
850 return AVERROR(ENOMEM);
853 bin->pos = avio_tell(pb);
854 if (avio_read(pb, bin->data, length) != length) {
855 av_freep(&bin->data);
864 * Read the next element, but only the header. The contents
865 * are supposed to be sub-elements which can be read separately.
866 * 0 is success, < 0 is failure.
868 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
870 AVIOContext *pb = matroska->ctx->pb;
871 MatroskaLevel *level;
873 if (matroska->num_levels >= EBML_MAX_DEPTH) {
874 av_log(matroska->ctx, AV_LOG_ERROR,
875 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
876 return AVERROR(ENOSYS);
879 level = &matroska->levels[matroska->num_levels++];
880 level->start = avio_tell(pb);
881 level->length = length;
887 * Read signed/unsigned "EBML" numbers.
888 * Return: number of bytes processed, < 0 on error
890 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
891 uint8_t *data, uint32_t size, uint64_t *num)
894 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
895 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
899 * Same as above, but signed.
901 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
902 uint8_t *data, uint32_t size, int64_t *num)
907 /* read as unsigned number first */
908 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
911 /* make signed (weird way) */
912 *num = unum - ((1LL << (7 * res - 1)) - 1);
917 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
918 EbmlSyntax *syntax, void *data);
920 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
921 uint32_t id, void *data)
924 for (i = 0; syntax[i].id; i++)
925 if (id == syntax[i].id)
927 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
928 matroska->num_levels > 0 &&
929 matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
930 return 0; // we reached the end of an unknown size cluster
931 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
932 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%"PRIX32"\n", id);
933 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
934 return AVERROR_INVALIDDATA;
936 return ebml_parse_elem(matroska, &syntax[i], data);
939 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
942 if (!matroska->current_id) {
944 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
947 matroska->current_id = id | 1 << 7 * res;
949 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
952 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
957 for (i = 0; syntax[i].id; i++)
958 switch (syntax[i].type) {
960 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
963 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
967 // the default may be NULL
968 if (syntax[i].def.s) {
969 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
970 *dst = av_strdup(syntax[i].def.s);
972 return AVERROR(ENOMEM);
977 while (!res && !ebml_level_end(matroska))
978 res = ebml_parse(matroska, syntax, data);
983 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
984 EbmlSyntax *syntax, void *data)
986 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
989 // max. 16 MB for strings
990 [EBML_STR] = 0x1000000,
991 [EBML_UTF8] = 0x1000000,
992 // max. 256 MB for binary data
993 [EBML_BIN] = 0x10000000,
994 // no limits for anything else
996 AVIOContext *pb = matroska->ctx->pb;
997 uint32_t id = syntax->id;
1002 data = (char *) data + syntax->data_offset;
1003 if (syntax->list_elem_size) {
1004 EbmlList *list = data;
1005 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1007 return AVERROR(ENOMEM);
1008 list->elem = newelem;
1009 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1010 memset(data, 0, syntax->list_elem_size);
1014 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1015 matroska->current_id = 0;
1016 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1018 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1019 av_log(matroska->ctx, AV_LOG_ERROR,
1020 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1021 length, max_lengths[syntax->type], syntax->type);
1022 return AVERROR_INVALIDDATA;
1026 switch (syntax->type) {
1028 res = ebml_read_uint(pb, length, data);
1031 res = ebml_read_sint(pb, length, data);
1034 res = ebml_read_float(pb, length, data);
1038 res = ebml_read_ascii(pb, length, data);
1041 res = ebml_read_binary(pb, length, data);
1044 if ((res = ebml_read_master(matroska, length)) < 0)
1046 if (id == MATROSKA_ID_SEGMENT)
1047 matroska->segment_start = avio_tell(matroska->ctx->pb);
1048 return ebml_parse_nest(matroska, syntax->def.n, data);
1050 return ebml_parse_id(matroska, syntax->def.n, id, data);
1054 if (ffio_limit(pb, length) != length)
1055 return AVERROR(EIO);
1056 return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1058 if (res == AVERROR_INVALIDDATA)
1059 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1060 else if (res == AVERROR(EIO))
1061 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1065 static void ebml_free(EbmlSyntax *syntax, void *data)
1068 for (i = 0; syntax[i].id; i++) {
1069 void *data_off = (char *) data + syntax[i].data_offset;
1070 switch (syntax[i].type) {
1076 av_freep(&((EbmlBin *) data_off)->data);
1079 if (syntax[i].list_elem_size) {
1080 EbmlList *list = data_off;
1081 char *ptr = list->elem;
1082 for (j = 0; j < list->nb_elem;
1083 j++, ptr += syntax[i].list_elem_size)
1084 ebml_free(syntax[i].def.n, ptr);
1085 av_free(list->elem);
1087 ebml_free(syntax[i].def.n, data_off);
1097 static int matroska_probe(AVProbeData *p)
1100 int len_mask = 0x80, size = 1, n = 1, i;
1103 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1106 /* length of header */
1108 while (size <= 8 && !(total & len_mask)) {
1114 total &= (len_mask - 1);
1116 total = (total << 8) | p->buf[4 + n++];
1118 /* Does the probe data contain the whole header? */
1119 if (p->buf_size < 4 + size + total)
1122 /* The header should contain a known document type. For now,
1123 * we don't parse the whole header but simply check for the
1124 * availability of that array of characters inside the header.
1125 * Not fully fool-proof, but good enough. */
1126 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1127 int probelen = strlen(matroska_doctypes[i]);
1128 if (total < probelen)
1130 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1131 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1132 return AVPROBE_SCORE_MAX;
1135 // probably valid EBML header but no recognized doctype
1136 return AVPROBE_SCORE_EXTENSION;
1139 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1142 MatroskaTrack *tracks = matroska->tracks.elem;
1145 for (i = 0; i < matroska->tracks.nb_elem; i++)
1146 if (tracks[i].num == num)
1149 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1153 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1154 MatroskaTrack *track)
1156 MatroskaTrackEncoding *encodings = track->encodings.elem;
1157 uint8_t *data = *buf;
1158 int isize = *buf_size;
1159 uint8_t *pkt_data = NULL;
1160 uint8_t av_unused *newpktdata;
1161 int pkt_size = isize;
1165 if (pkt_size >= 10000000U)
1166 return AVERROR_INVALIDDATA;
1168 switch (encodings[0].compression.algo) {
1169 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1171 int header_size = encodings[0].compression.settings.size;
1172 uint8_t *header = encodings[0].compression.settings.data;
1174 if (header_size && !header) {
1175 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1182 pkt_size = isize + header_size;
1183 pkt_data = av_malloc(pkt_size);
1185 return AVERROR(ENOMEM);
1187 memcpy(pkt_data, header, header_size);
1188 memcpy(pkt_data + header_size, data, isize);
1192 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1194 olen = pkt_size *= 3;
1195 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1197 result = AVERROR(ENOMEM);
1200 pkt_data = newpktdata;
1201 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1202 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1204 result = AVERROR_INVALIDDATA;
1211 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1213 z_stream zstream = { 0 };
1214 if (inflateInit(&zstream) != Z_OK)
1216 zstream.next_in = data;
1217 zstream.avail_in = isize;
1220 newpktdata = av_realloc(pkt_data, pkt_size);
1222 inflateEnd(&zstream);
1225 pkt_data = newpktdata;
1226 zstream.avail_out = pkt_size - zstream.total_out;
1227 zstream.next_out = pkt_data + zstream.total_out;
1229 result = inflate(&zstream, Z_NO_FLUSH);
1231 result = Z_MEM_ERROR;
1232 } while (result == Z_OK && pkt_size < 10000000);
1233 pkt_size = zstream.total_out;
1234 inflateEnd(&zstream);
1235 if (result != Z_STREAM_END) {
1236 if (result == Z_MEM_ERROR)
1237 result = AVERROR(ENOMEM);
1239 result = AVERROR_INVALIDDATA;
1246 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1248 bz_stream bzstream = { 0 };
1249 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1251 bzstream.next_in = data;
1252 bzstream.avail_in = isize;
1255 newpktdata = av_realloc(pkt_data, pkt_size);
1257 BZ2_bzDecompressEnd(&bzstream);
1260 pkt_data = newpktdata;
1261 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1262 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1264 result = BZ2_bzDecompress(&bzstream);
1266 result = BZ_MEM_ERROR;
1267 } while (result == BZ_OK && pkt_size < 10000000);
1268 pkt_size = bzstream.total_out_lo32;
1269 BZ2_bzDecompressEnd(&bzstream);
1270 if (result != BZ_STREAM_END) {
1271 if (result == BZ_MEM_ERROR)
1272 result = AVERROR(ENOMEM);
1274 result = AVERROR_INVALIDDATA;
1281 return AVERROR_INVALIDDATA;
1285 *buf_size = pkt_size;
1294 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1295 AVPacket *pkt, uint64_t display_duration)
1298 char *layer, *ptr = pkt->data, *end = ptr + pkt->size;
1300 for (; *ptr != ',' && ptr < end - 1; ptr++)
1305 for (; *ptr != ',' && ptr < end - 1; ptr++)
1308 int64_t end_pts = pkt->pts + display_duration;
1309 int sc = matroska->time_scale * pkt->pts / 10000000;
1310 int ec = matroska->time_scale * end_pts / 10000000;
1311 int sh, sm, ss, eh, em, es, len;
1325 len = 50 + end - ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1326 if (!(line = av_buffer_alloc(len)))
1328 snprintf(line->data, len,
1329 "Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1330 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1331 av_buffer_unref(&pkt->buf);
1333 pkt->data = line->data;
1334 pkt->size = strlen(line->data);
1338 static int matroska_merge_packets(AVPacket *out, AVPacket *in)
1340 int ret = av_grow_packet(out, in->size);
1344 memcpy(out->data + out->size - in->size, in->data, in->size);
1352 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1353 AVDictionary **metadata, char *prefix)
1355 MatroskaTag *tags = list->elem;
1359 for (i = 0; i < list->nb_elem; i++) {
1360 const char *lang = tags[i].lang &&
1361 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1363 if (!tags[i].name) {
1364 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1368 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1370 av_strlcpy(key, tags[i].name, sizeof(key));
1371 if (tags[i].def || !lang) {
1372 av_dict_set(metadata, key, tags[i].string, 0);
1373 if (tags[i].sub.nb_elem)
1374 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1377 av_strlcat(key, "-", sizeof(key));
1378 av_strlcat(key, lang, sizeof(key));
1379 av_dict_set(metadata, key, tags[i].string, 0);
1380 if (tags[i].sub.nb_elem)
1381 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1384 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1387 static void matroska_convert_tags(AVFormatContext *s)
1389 MatroskaDemuxContext *matroska = s->priv_data;
1390 MatroskaTags *tags = matroska->tags.elem;
1393 for (i = 0; i < matroska->tags.nb_elem; i++) {
1394 if (tags[i].target.attachuid) {
1395 MatroskaAttachment *attachment = matroska->attachments.elem;
1396 for (j = 0; j < matroska->attachments.nb_elem; j++)
1397 if (attachment[j].uid == tags[i].target.attachuid &&
1398 attachment[j].stream)
1399 matroska_convert_tag(s, &tags[i].tag,
1400 &attachment[j].stream->metadata, NULL);
1401 } else if (tags[i].target.chapteruid) {
1402 MatroskaChapter *chapter = matroska->chapters.elem;
1403 for (j = 0; j < matroska->chapters.nb_elem; j++)
1404 if (chapter[j].uid == tags[i].target.chapteruid &&
1406 matroska_convert_tag(s, &tags[i].tag,
1407 &chapter[j].chapter->metadata, NULL);
1408 } else if (tags[i].target.trackuid) {
1409 MatroskaTrack *track = matroska->tracks.elem;
1410 for (j = 0; j < matroska->tracks.nb_elem; j++)
1411 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1412 matroska_convert_tag(s, &tags[i].tag,
1413 &track[j].stream->metadata, NULL);
1415 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1416 tags[i].target.type);
1421 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1424 EbmlList *seekhead_list = &matroska->seekhead;
1425 uint32_t level_up = matroska->level_up;
1426 uint32_t saved_id = matroska->current_id;
1427 MatroskaSeekhead *seekhead = seekhead_list->elem;
1428 int64_t before_pos = avio_tell(matroska->ctx->pb);
1429 MatroskaLevel level;
1433 if (idx >= seekhead_list->nb_elem ||
1434 seekhead[idx].id == MATROSKA_ID_SEEKHEAD ||
1435 seekhead[idx].id == MATROSKA_ID_CLUSTER)
1439 offset = seekhead[idx].pos + matroska->segment_start;
1440 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1441 /* We don't want to lose our seekhead level, so we add
1442 * a dummy. This is a crude hack. */
1443 if (matroska->num_levels == EBML_MAX_DEPTH) {
1444 av_log(matroska->ctx, AV_LOG_INFO,
1445 "Max EBML element depth (%d) reached, "
1446 "cannot parse further.\n", EBML_MAX_DEPTH);
1447 ret = AVERROR_INVALIDDATA;
1450 level.length = (uint64_t) -1;
1451 matroska->levels[matroska->num_levels] = level;
1452 matroska->num_levels++;
1453 matroska->current_id = 0;
1455 ret = ebml_parse(matroska, matroska_segment, matroska);
1457 /* remove dummy level */
1458 while (matroska->num_levels) {
1459 uint64_t length = matroska->levels[--matroska->num_levels].length;
1460 if (length == (uint64_t) -1)
1466 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1467 matroska->level_up = level_up;
1468 matroska->current_id = saved_id;
1473 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1475 EbmlList *seekhead_list = &matroska->seekhead;
1476 int64_t before_pos = avio_tell(matroska->ctx->pb);
1479 // we should not do any seeking in the streaming case
1480 if (!matroska->ctx->pb->seekable ||
1481 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1484 for (i = 0; i < seekhead_list->nb_elem; i++) {
1485 MatroskaSeekhead *seekhead = seekhead_list->elem;
1486 if (seekhead[i].pos <= before_pos)
1489 // defer cues parsing until we actually need cue data.
1490 if (seekhead[i].id == MATROSKA_ID_CUES) {
1491 matroska->cues_parsing_deferred = 1;
1495 if (matroska_parse_seekhead_entry(matroska, i) < 0) {
1496 // mark index as broken
1497 matroska->cues_parsing_deferred = -1;
1503 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1505 EbmlList *index_list;
1506 MatroskaIndex *index;
1507 int index_scale = 1;
1510 index_list = &matroska->index;
1511 index = index_list->elem;
1512 if (index_list->nb_elem &&
1513 index[0].time > 1E14 / matroska->time_scale) {
1514 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1515 index_scale = matroska->time_scale;
1517 for (i = 0; i < index_list->nb_elem; i++) {
1518 EbmlList *pos_list = &index[i].pos;
1519 MatroskaIndexPos *pos = pos_list->elem;
1520 for (j = 0; j < pos_list->nb_elem; j++) {
1521 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1523 if (track && track->stream)
1524 av_add_index_entry(track->stream,
1525 pos[j].pos + matroska->segment_start,
1526 index[i].time / index_scale, 0, 0,
1532 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1533 EbmlList *seekhead_list = &matroska->seekhead;
1534 MatroskaSeekhead *seekhead = seekhead_list->elem;
1537 for (i = 0; i < seekhead_list->nb_elem; i++)
1538 if (seekhead[i].id == MATROSKA_ID_CUES)
1540 av_assert1(i <= seekhead_list->nb_elem);
1542 if (matroska_parse_seekhead_entry(matroska, i) < 0)
1543 matroska->cues_parsing_deferred = -1;
1544 matroska_add_index_entries(matroska);
1547 static int matroska_aac_profile(char *codec_id)
1549 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1552 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1553 if (strstr(codec_id, aac_profiles[profile]))
1558 static int matroska_aac_sri(int samplerate)
1562 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1563 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1568 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1571 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1572 time_t creation_time = date_utc / 1000000000 + 978307200;
1573 struct tm *ptm = gmtime(&creation_time);
1575 strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
1576 av_dict_set(metadata, "creation_time", buffer, 0);
1579 static int matroska_parse_flac(AVFormatContext *s,
1580 MatroskaTrack *track,
1583 AVStream *st = track->stream;
1584 uint8_t *p = track->codec_priv.data;
1585 int size = track->codec_priv.size;
1587 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1588 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1589 track->codec_priv.size = 0;
1593 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1595 p += track->codec_priv.size;
1596 size -= track->codec_priv.size;
1598 /* parse the remaining metadata blocks if present */
1600 int block_last, block_type, block_size;
1602 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1606 if (block_size > size)
1609 /* check for the channel mask */
1610 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1611 AVDictionary *dict = NULL;
1612 AVDictionaryEntry *chmask;
1614 ff_vorbis_comment(s, &dict, p, block_size, 0);
1615 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1617 uint64_t mask = strtol(chmask->value, NULL, 0);
1618 if (!mask || mask & ~0x3ffffULL) {
1619 av_log(s, AV_LOG_WARNING,
1620 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1622 st->codec->channel_layout = mask;
1624 av_dict_free(&dict);
1634 static int matroska_parse_tracks(AVFormatContext *s)
1636 MatroskaDemuxContext *matroska = s->priv_data;
1637 MatroskaTrack *tracks = matroska->tracks.elem;
1642 for (i = 0; i < matroska->tracks.nb_elem; i++) {
1643 MatroskaTrack *track = &tracks[i];
1644 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1645 EbmlList *encodings_list = &track->encodings;
1646 MatroskaTrackEncoding *encodings = encodings_list->elem;
1647 uint8_t *extradata = NULL;
1648 int extradata_size = 0;
1649 int extradata_offset = 0;
1650 uint32_t fourcc = 0;
1652 char* key_id_base64 = NULL;
1655 /* Apply some sanity checks. */
1656 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1657 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1658 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1659 track->type != MATROSKA_TRACK_TYPE_METADATA) {
1660 av_log(matroska->ctx, AV_LOG_INFO,
1661 "Unknown or unsupported track type %"PRIu64"\n",
1665 if (track->codec_id == NULL)
1668 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1669 if (!track->default_duration && track->video.frame_rate > 0)
1670 track->default_duration = 1000000000 / track->video.frame_rate;
1671 if (track->video.display_width == -1)
1672 track->video.display_width = track->video.pixel_width;
1673 if (track->video.display_height == -1)
1674 track->video.display_height = track->video.pixel_height;
1675 if (track->video.color_space.size == 4)
1676 fourcc = AV_RL32(track->video.color_space.data);
1677 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1678 if (!track->audio.out_samplerate)
1679 track->audio.out_samplerate = track->audio.samplerate;
1681 if (encodings_list->nb_elem > 1) {
1682 av_log(matroska->ctx, AV_LOG_ERROR,
1683 "Multiple combined encodings not supported");
1684 } else if (encodings_list->nb_elem == 1) {
1685 if (encodings[0].type) {
1686 if (encodings[0].encryption.key_id.size > 0) {
1687 /* Save the encryption key id to be stored later as a
1689 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1690 key_id_base64 = av_malloc(b64_size);
1691 if (key_id_base64 == NULL)
1692 return AVERROR(ENOMEM);
1694 av_base64_encode(key_id_base64, b64_size,
1695 encodings[0].encryption.key_id.data,
1696 encodings[0].encryption.key_id.size);
1698 encodings[0].scope = 0;
1699 av_log(matroska->ctx, AV_LOG_ERROR,
1700 "Unsupported encoding type");
1704 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1707 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1710 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1712 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
1713 encodings[0].scope = 0;
1714 av_log(matroska->ctx, AV_LOG_ERROR,
1715 "Unsupported encoding type");
1716 } else if (track->codec_priv.size && encodings[0].scope & 2) {
1717 uint8_t *codec_priv = track->codec_priv.data;
1718 int ret = matroska_decode_buffer(&track->codec_priv.data,
1719 &track->codec_priv.size,
1722 track->codec_priv.data = NULL;
1723 track->codec_priv.size = 0;
1724 av_log(matroska->ctx, AV_LOG_ERROR,
1725 "Failed to decode codec private data\n");
1728 if (codec_priv != track->codec_priv.data)
1729 av_free(codec_priv);
1733 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1734 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1735 strlen(ff_mkv_codec_tags[j].str))) {
1736 codec_id = ff_mkv_codec_tags[j].id;
1741 st = track->stream = avformat_new_stream(s, NULL);
1743 av_free(key_id_base64);
1744 return AVERROR(ENOMEM);
1747 if (key_id_base64) {
1748 /* export encryption key id as base64 metadata tag */
1749 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1750 av_freep(&key_id_base64);
1753 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1754 track->codec_priv.size >= 40 &&
1755 track->codec_priv.data != NULL) {
1756 track->ms_compat = 1;
1757 bit_depth = AV_RL16(track->codec_priv.data + 14);
1758 fourcc = AV_RL32(track->codec_priv.data + 16);
1759 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
1762 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
1764 extradata_offset = 40;
1765 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1766 track->codec_priv.size >= 14 &&
1767 track->codec_priv.data != NULL) {
1769 ffio_init_context(&b, track->codec_priv.data,
1770 track->codec_priv.size,
1771 0, NULL, NULL, NULL, NULL);
1772 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1775 codec_id = st->codec->codec_id;
1776 extradata_offset = FFMIN(track->codec_priv.size, 18);
1777 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1778 && (track->codec_priv.size >= 86)
1779 && (track->codec_priv.data != NULL)) {
1780 fourcc = AV_RL32(track->codec_priv.data + 4);
1781 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1782 if (ff_codec_get_id(ff_codec_movaudio_tags, AV_RL32(track->codec_priv.data))) {
1783 fourcc = AV_RL32(track->codec_priv.data);
1784 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1786 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1787 (track->codec_priv.size >= 21) &&
1788 (track->codec_priv.data != NULL)) {
1789 fourcc = AV_RL32(track->codec_priv.data + 4);
1790 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1791 if (ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(track->codec_priv.data))) {
1792 fourcc = AV_RL32(track->codec_priv.data);
1793 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1795 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1796 codec_id = AV_CODEC_ID_SVQ3;
1797 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1798 switch (track->audio.bitdepth) {
1800 codec_id = AV_CODEC_ID_PCM_U8;
1803 codec_id = AV_CODEC_ID_PCM_S24BE;
1806 codec_id = AV_CODEC_ID_PCM_S32BE;
1809 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1810 switch (track->audio.bitdepth) {
1812 codec_id = AV_CODEC_ID_PCM_U8;
1815 codec_id = AV_CODEC_ID_PCM_S24LE;
1818 codec_id = AV_CODEC_ID_PCM_S32LE;
1821 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1822 track->audio.bitdepth == 64) {
1823 codec_id = AV_CODEC_ID_PCM_F64LE;
1824 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1825 int profile = matroska_aac_profile(track->codec_id);
1826 int sri = matroska_aac_sri(track->audio.samplerate);
1827 extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1828 if (extradata == NULL)
1829 return AVERROR(ENOMEM);
1830 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1831 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1832 if (strstr(track->codec_id, "SBR")) {
1833 sri = matroska_aac_sri(track->audio.out_samplerate);
1834 extradata[2] = 0x56;
1835 extradata[3] = 0xE5;
1836 extradata[4] = 0x80 | (sri << 3);
1840 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1841 /* Only ALAC's magic cookie is stored in Matroska's track headers.
1842 * Create the "atom size", "tag", and "tag version" fields the
1843 * decoder expects manually. */
1844 extradata_size = 12 + track->codec_priv.size;
1845 extradata = av_mallocz(extradata_size +
1846 FF_INPUT_BUFFER_PADDING_SIZE);
1847 if (extradata == NULL)
1848 return AVERROR(ENOMEM);
1849 AV_WB32(extradata, extradata_size);
1850 memcpy(&extradata[4], "alac", 4);
1851 AV_WB32(&extradata[8], 0);
1852 memcpy(&extradata[12], track->codec_priv.data,
1853 track->codec_priv.size);
1854 } else if (codec_id == AV_CODEC_ID_TTA) {
1855 extradata_size = 30;
1856 extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1857 if (extradata == NULL)
1858 return AVERROR(ENOMEM);
1859 ffio_init_context(&b, extradata, extradata_size, 1,
1860 NULL, NULL, NULL, NULL);
1861 avio_write(&b, "TTA1", 4);
1863 avio_wl16(&b, track->audio.channels);
1864 avio_wl16(&b, track->audio.bitdepth);
1865 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1866 return AVERROR_INVALIDDATA;
1867 avio_wl32(&b, track->audio.out_samplerate);
1868 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1869 track->audio.out_samplerate,
1870 AV_TIME_BASE * 1000));
1871 } else if (codec_id == AV_CODEC_ID_RV10 ||
1872 codec_id == AV_CODEC_ID_RV20 ||
1873 codec_id == AV_CODEC_ID_RV30 ||
1874 codec_id == AV_CODEC_ID_RV40) {
1875 extradata_offset = 26;
1876 } else if (codec_id == AV_CODEC_ID_RA_144) {
1877 track->audio.out_samplerate = 8000;
1878 track->audio.channels = 1;
1879 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1880 codec_id == AV_CODEC_ID_COOK ||
1881 codec_id == AV_CODEC_ID_ATRAC3 ||
1882 codec_id == AV_CODEC_ID_SIPR)
1883 && track->codec_priv.data) {
1884 #if CONFIG_RA_288_DECODER || CONFIG_COOK_DECODER || CONFIG_ATRAC3_DECODER || CONFIG_SIPR_DECODER
1887 ffio_init_context(&b, track->codec_priv.data,
1888 track->codec_priv.size,
1889 0, NULL, NULL, NULL, NULL);
1891 flavor = avio_rb16(&b);
1892 track->audio.coded_framesize = avio_rb32(&b);
1894 track->audio.sub_packet_h = avio_rb16(&b);
1895 track->audio.frame_size = avio_rb16(&b);
1896 track->audio.sub_packet_size = avio_rb16(&b);
1898 track->audio.coded_framesize <= 0 ||
1899 track->audio.sub_packet_h <= 0 ||
1900 track->audio.frame_size <= 0 ||
1901 track->audio.sub_packet_size <= 0)
1902 return AVERROR_INVALIDDATA;
1903 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1904 track->audio.frame_size);
1905 if (!track->audio.buf)
1906 return AVERROR(ENOMEM);
1907 if (codec_id == AV_CODEC_ID_RA_288) {
1908 st->codec->block_align = track->audio.coded_framesize;
1909 track->codec_priv.size = 0;
1911 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1912 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1913 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1914 st->codec->bit_rate = sipr_bit_rate[flavor];
1916 st->codec->block_align = track->audio.sub_packet_size;
1917 extradata_offset = 78;
1920 /* Returning without closing would cause leaks with some files */
1921 matroska_read_close(s);
1922 return AVERROR_INVALIDDATA;
1924 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
1925 ret = matroska_parse_flac(s, track, &extradata_offset);
1928 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1929 fourcc = AV_RL32(track->codec_priv.data);
1931 track->codec_priv.size -= extradata_offset;
1933 if (codec_id == AV_CODEC_ID_NONE)
1934 av_log(matroska->ctx, AV_LOG_INFO,
1935 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1937 if (track->time_scale < 0.01)
1938 track->time_scale = 1.0;
1939 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1940 1000 * 1000 * 1000); /* 64 bit pts in ns */
1942 /* convert the delay from ns to the track timebase */
1943 track->codec_delay = av_rescale_q(track->codec_delay,
1944 (AVRational){ 1, 1000000000 },
1947 st->codec->codec_id = codec_id;
1949 if (strcmp(track->language, "und"))
1950 av_dict_set(&st->metadata, "language", track->language, 0);
1951 av_dict_set(&st->metadata, "title", track->name, 0);
1953 if (track->flag_default)
1954 st->disposition |= AV_DISPOSITION_DEFAULT;
1955 if (track->flag_forced)
1956 st->disposition |= AV_DISPOSITION_FORCED;
1958 if (!st->codec->extradata) {
1960 st->codec->extradata = extradata;
1961 st->codec->extradata_size = extradata_size;
1962 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1963 if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1964 return AVERROR(ENOMEM);
1965 memcpy(st->codec->extradata,
1966 track->codec_priv.data + extradata_offset,
1967 track->codec_priv.size);
1971 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1972 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1974 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1975 st->codec->codec_tag = fourcc;
1977 st->codec->bits_per_coded_sample = bit_depth;
1978 st->codec->width = track->video.pixel_width;
1979 st->codec->height = track->video.pixel_height;
1980 av_reduce(&st->sample_aspect_ratio.num,
1981 &st->sample_aspect_ratio.den,
1982 st->codec->height * track->video.display_width,
1983 st->codec->width * track->video.display_height,
1985 if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1986 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1988 if (track->default_duration) {
1989 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1990 1000000000, track->default_duration, 30000);
1991 #if FF_API_R_FRAME_RATE
1992 if (st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L)
1993 st->r_frame_rate = st->avg_frame_rate;
1997 /* export stereo mode flag as metadata tag */
1998 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREO_MODE_COUNT)
1999 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2001 /* export alpha mode flag as metadata tag */
2002 if (track->video.alpha_mode)
2003 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2005 /* if we have virtual track, mark the real tracks */
2006 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2008 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2010 snprintf(buf, sizeof(buf), "%s_%d",
2011 ff_matroska_video_stereo_plane[planes[j].type], i);
2012 for (k=0; k < matroska->tracks.nb_elem; k++)
2013 if (planes[j].uid == tracks[k].uid) {
2014 av_dict_set(&s->streams[k]->metadata,
2015 "stereo_mode", buf, 0);
2019 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2020 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
2021 st->codec->sample_rate = track->audio.out_samplerate;
2022 st->codec->channels = track->audio.channels;
2023 if (!st->codec->bits_per_coded_sample)
2024 st->codec->bits_per_coded_sample = track->audio.bitdepth;
2025 if (st->codec->codec_id != AV_CODEC_ID_AAC)
2026 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2027 if (track->codec_delay > 0) {
2028 st->codec->delay = av_rescale_q(track->codec_delay,
2030 (AVRational){1, st->codec->sample_rate});
2032 if (track->seek_preroll > 0) {
2033 av_codec_set_seek_preroll(st->codec,
2034 av_rescale_q(track->seek_preroll,
2035 (AVRational){1, 1000000000},
2036 (AVRational){1, st->codec->sample_rate}));
2038 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2039 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2041 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2042 st->disposition |= AV_DISPOSITION_CAPTIONS;
2043 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2044 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2045 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2046 st->disposition |= AV_DISPOSITION_METADATA;
2048 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2049 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2051 if (st->codec->codec_id == AV_CODEC_ID_SSA ||
2052 st->codec->codec_id == AV_CODEC_ID_ASS)
2054 if (st->codec->codec_id == AV_CODEC_ID_ASS)
2056 matroska->contains_ssa = 1;
2063 static int matroska_read_header(AVFormatContext *s)
2065 MatroskaDemuxContext *matroska = s->priv_data;
2066 EbmlList *attachments_list = &matroska->attachments;
2067 EbmlList *chapters_list = &matroska->chapters;
2068 MatroskaAttachment *attachments;
2069 MatroskaChapter *chapters;
2070 uint64_t max_start = 0;
2077 /* First read the EBML header. */
2078 if (ebml_parse(matroska, ebml_syntax, &ebml) ||
2079 ebml.version > EBML_VERSION ||
2080 ebml.max_size > sizeof(uint64_t) ||
2081 ebml.id_length > sizeof(uint32_t) ||
2082 ebml.doctype_version > 3 ||
2084 av_log(matroska->ctx, AV_LOG_ERROR,
2085 "EBML header using unsupported features\n"
2086 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2087 ebml.version, ebml.doctype, ebml.doctype_version);
2088 ebml_free(ebml_syntax, &ebml);
2089 return AVERROR_PATCHWELCOME;
2090 } else if (ebml.doctype_version == 3) {
2091 av_log(matroska->ctx, AV_LOG_WARNING,
2092 "EBML header using unsupported features\n"
2093 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2094 ebml.version, ebml.doctype, ebml.doctype_version);
2096 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2097 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2099 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2100 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2101 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2102 ebml_free(ebml_syntax, &ebml);
2103 return AVERROR_INVALIDDATA;
2106 ebml_free(ebml_syntax, &ebml);
2108 /* The next thing is a segment. */
2109 pos = avio_tell(matroska->ctx->pb);
2110 res = ebml_parse(matroska, matroska_segments, matroska);
2111 // try resyncing until we find a EBML_STOP type element.
2113 res = matroska_resync(matroska, pos);
2116 pos = avio_tell(matroska->ctx->pb);
2117 res = ebml_parse(matroska, matroska_segment, matroska);
2119 matroska_execute_seekhead(matroska);
2121 if (!matroska->time_scale)
2122 matroska->time_scale = 1000000;
2123 if (matroska->duration)
2124 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2125 1000 / AV_TIME_BASE;
2126 av_dict_set(&s->metadata, "title", matroska->title, 0);
2127 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2129 if (matroska->date_utc.size == 8)
2130 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2132 res = matroska_parse_tracks(s);
2136 attachments = attachments_list->elem;
2137 for (j = 0; j < attachments_list->nb_elem; j++) {
2138 if (!(attachments[j].filename && attachments[j].mime &&
2139 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2140 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2142 AVStream *st = avformat_new_stream(s, NULL);
2145 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2146 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2147 st->codec->codec_id = AV_CODEC_ID_NONE;
2148 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2149 if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2151 memcpy(st->codec->extradata, attachments[j].bin.data,
2152 attachments[j].bin.size);
2154 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2155 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2156 strlen(ff_mkv_mime_tags[i].str))) {
2157 st->codec->codec_id = ff_mkv_mime_tags[i].id;
2161 attachments[j].stream = st;
2165 chapters = chapters_list->elem;
2166 for (i = 0; i < chapters_list->nb_elem; i++)
2167 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2168 (max_start == 0 || chapters[i].start > max_start)) {
2169 chapters[i].chapter =
2170 avpriv_new_chapter(s, chapters[i].uid,
2171 (AVRational) { 1, 1000000000 },
2172 chapters[i].start, chapters[i].end,
2174 av_dict_set(&chapters[i].chapter->metadata,
2175 "title", chapters[i].title, 0);
2176 max_start = chapters[i].start;
2179 matroska_add_index_entries(matroska);
2181 matroska_convert_tags(s);
2187 * Put one packet in an application-supplied AVPacket struct.
2188 * Returns 0 on success or -1 on failure.
2190 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2193 if (matroska->num_packets > 0) {
2194 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2195 av_free(matroska->packets[0]);
2196 if (matroska->num_packets > 1) {
2198 memmove(&matroska->packets[0], &matroska->packets[1],
2199 (matroska->num_packets - 1) * sizeof(AVPacket *));
2200 newpackets = av_realloc(matroska->packets,
2201 (matroska->num_packets - 1) *
2202 sizeof(AVPacket *));
2204 matroska->packets = newpackets;
2206 av_freep(&matroska->packets);
2207 matroska->prev_pkt = NULL;
2209 matroska->num_packets--;
2217 * Free all packets in our internal queue.
2219 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2221 matroska->prev_pkt = NULL;
2222 if (matroska->packets) {
2224 for (n = 0; n < matroska->num_packets; n++) {
2225 av_free_packet(matroska->packets[n]);
2226 av_free(matroska->packets[n]);
2228 av_freep(&matroska->packets);
2229 matroska->num_packets = 0;
2233 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2234 int *buf_size, int type,
2235 uint32_t **lace_buf, int *laces)
2237 int res = 0, n, size = *buf_size;
2238 uint8_t *data = *buf;
2239 uint32_t *lace_size;
2243 *lace_buf = av_mallocz(sizeof(int));
2245 return AVERROR(ENOMEM);
2247 *lace_buf[0] = size;
2251 av_assert0(size > 0);
2255 lace_size = av_mallocz(*laces * sizeof(int));
2257 return AVERROR(ENOMEM);
2260 case 0x1: /* Xiph lacing */
2264 for (n = 0; res == 0 && n < *laces - 1; n++) {
2266 if (size <= total) {
2267 res = AVERROR_INVALIDDATA;
2272 lace_size[n] += temp;
2279 if (size <= total) {
2280 res = AVERROR_INVALIDDATA;
2284 lace_size[n] = size - total;
2288 case 0x2: /* fixed-size lacing */
2289 if (size % (*laces)) {
2290 res = AVERROR_INVALIDDATA;
2293 for (n = 0; n < *laces; n++)
2294 lace_size[n] = size / *laces;
2297 case 0x3: /* EBML lacing */
2301 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2302 if (n < 0 || num > INT_MAX) {
2303 av_log(matroska->ctx, AV_LOG_INFO,
2304 "EBML block data error\n");
2305 res = n<0 ? n : AVERROR_INVALIDDATA;
2310 total = lace_size[0] = num;
2311 for (n = 1; res == 0 && n < *laces - 1; n++) {
2314 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2315 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2316 av_log(matroska->ctx, AV_LOG_INFO,
2317 "EBML block data error\n");
2318 res = r<0 ? r : AVERROR_INVALIDDATA;
2323 lace_size[n] = lace_size[n - 1] + snum;
2324 total += lace_size[n];
2326 if (size <= total) {
2327 res = AVERROR_INVALIDDATA;
2330 lace_size[*laces - 1] = size - total;
2336 *lace_buf = lace_size;
2342 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2343 MatroskaTrack *track, AVStream *st,
2344 uint8_t *data, int size, uint64_t timecode,
2347 int a = st->codec->block_align;
2348 int sps = track->audio.sub_packet_size;
2349 int cfs = track->audio.coded_framesize;
2350 int h = track->audio.sub_packet_h;
2351 int y = track->audio.sub_packet_cnt;
2352 int w = track->audio.frame_size;
2355 if (!track->audio.pkt_cnt) {
2356 if (track->audio.sub_packet_cnt == 0)
2357 track->audio.buf_timecode = timecode;
2358 if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2359 if (size < cfs * h / 2) {
2360 av_log(matroska->ctx, AV_LOG_ERROR,
2361 "Corrupt int4 RM-style audio packet size\n");
2362 return AVERROR_INVALIDDATA;
2364 for (x = 0; x < h / 2; x++)
2365 memcpy(track->audio.buf + x * 2 * w + y * cfs,
2366 data + x * cfs, cfs);
2367 } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2369 av_log(matroska->ctx, AV_LOG_ERROR,
2370 "Corrupt sipr RM-style audio packet size\n");
2371 return AVERROR_INVALIDDATA;
2373 memcpy(track->audio.buf + y * w, data, w);
2375 if (size < sps * w / sps || h<=0 || w%sps) {
2376 av_log(matroska->ctx, AV_LOG_ERROR,
2377 "Corrupt generic RM-style audio packet size\n");
2378 return AVERROR_INVALIDDATA;
2380 for (x = 0; x < w / sps; x++)
2381 memcpy(track->audio.buf +
2382 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2383 data + x * sps, sps);
2386 if (++track->audio.sub_packet_cnt >= h) {
2387 if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2388 #if CONFIG_SIPR_DECODER
2389 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2391 return AVERROR_INVALIDDATA;
2394 track->audio.sub_packet_cnt = 0;
2395 track->audio.pkt_cnt = h * w / a;
2399 while (track->audio.pkt_cnt) {
2400 AVPacket *pkt = NULL;
2401 if (!(pkt = av_mallocz(sizeof(AVPacket))) || av_new_packet(pkt, a) < 0) {
2403 return AVERROR(ENOMEM);
2406 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2408 pkt->pts = track->audio.buf_timecode;
2409 track->audio.buf_timecode = AV_NOPTS_VALUE;
2411 pkt->stream_index = st->index;
2412 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2418 /* reconstruct full wavpack blocks from mangled matroska ones */
2419 static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
2420 uint8_t **pdst, int *size)
2422 uint8_t *dst = NULL;
2427 int ret, offset = 0;
2429 if (srclen < 12 || track->stream->codec->extradata_size < 2)
2430 return AVERROR_INVALIDDATA;
2432 ver = AV_RL16(track->stream->codec->extradata);
2434 samples = AV_RL32(src);
2438 while (srclen >= 8) {
2443 uint32_t flags = AV_RL32(src);
2444 uint32_t crc = AV_RL32(src + 4);
2448 multiblock = (flags & 0x1800) != 0x1800;
2451 ret = AVERROR_INVALIDDATA;
2454 blocksize = AV_RL32(src);
2460 if (blocksize > srclen) {
2461 ret = AVERROR_INVALIDDATA;
2465 tmp = av_realloc(dst, dstlen + blocksize + 32);
2467 ret = AVERROR(ENOMEM);
2471 dstlen += blocksize + 32;
2473 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2474 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2475 AV_WL16(dst + offset + 8, ver); // version
2476 AV_WL16(dst + offset + 10, 0); // track/index_no
2477 AV_WL32(dst + offset + 12, 0); // total samples
2478 AV_WL32(dst + offset + 16, 0); // block index
2479 AV_WL32(dst + offset + 20, samples); // number of samples
2480 AV_WL32(dst + offset + 24, flags); // flags
2481 AV_WL32(dst + offset + 28, crc); // crc
2482 memcpy(dst + offset + 32, src, blocksize); // block data
2485 srclen -= blocksize;
2486 offset += blocksize + 32;
2499 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
2500 MatroskaTrack *track,
2502 uint8_t *data, int data_len,
2508 uint8_t *id, *settings, *text, *buf;
2509 int id_len, settings_len, text_len;
2514 return AVERROR_INVALIDDATA;
2517 q = data + data_len;
2522 if (*p == '\r' || *p == '\n') {
2531 if (p >= q || *p != '\n')
2532 return AVERROR_INVALIDDATA;
2538 if (*p == '\r' || *p == '\n') {
2539 settings_len = p - settings;
2547 if (p >= q || *p != '\n')
2548 return AVERROR_INVALIDDATA;
2553 while (text_len > 0) {
2554 const int len = text_len - 1;
2555 const uint8_t c = p[len];
2556 if (c != '\r' && c != '\n')
2562 return AVERROR_INVALIDDATA;
2564 pkt = av_mallocz(sizeof(*pkt));
2565 err = av_new_packet(pkt, text_len);
2568 return AVERROR(err);
2571 memcpy(pkt->data, text, text_len);
2574 buf = av_packet_new_side_data(pkt,
2575 AV_PKT_DATA_WEBVTT_IDENTIFIER,
2579 return AVERROR(ENOMEM);
2581 memcpy(buf, id, id_len);
2584 if (settings_len > 0) {
2585 buf = av_packet_new_side_data(pkt,
2586 AV_PKT_DATA_WEBVTT_SETTINGS,
2590 return AVERROR(ENOMEM);
2592 memcpy(buf, settings, settings_len);
2595 // Do we need this for subtitles?
2596 // pkt->flags = AV_PKT_FLAG_KEY;
2598 pkt->stream_index = st->index;
2599 pkt->pts = timecode;
2601 // Do we need this for subtitles?
2602 // pkt->dts = timecode;
2604 pkt->duration = duration;
2607 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2608 matroska->prev_pkt = pkt;
2613 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2614 MatroskaTrack *track, AVStream *st,
2615 uint8_t *data, int pkt_size,
2616 uint64_t timecode, uint64_t lace_duration,
2617 int64_t pos, int is_keyframe,
2618 uint8_t *additional, uint64_t additional_id, int additional_size,
2619 int64_t discard_padding)
2621 MatroskaTrackEncoding *encodings = track->encodings.elem;
2622 uint8_t *pkt_data = data;
2623 int offset = 0, res;
2626 if (encodings && !encodings->type && encodings->scope & 1) {
2627 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2632 if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2634 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2636 av_log(matroska->ctx, AV_LOG_ERROR,
2637 "Error parsing a wavpack block.\n");
2640 if (pkt_data != data)
2641 av_freep(&pkt_data);
2645 if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2646 AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2649 pkt = av_mallocz(sizeof(AVPacket));
2650 /* XXX: prevent data copy... */
2651 if (av_new_packet(pkt, pkt_size + offset) < 0) {
2653 res = AVERROR(ENOMEM);
2657 if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2658 uint8_t *buf = pkt->data;
2659 bytestream_put_be32(&buf, pkt_size);
2660 bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2663 memcpy(pkt->data + offset, pkt_data, pkt_size);
2665 if (pkt_data != data)
2666 av_freep(&pkt_data);
2668 pkt->flags = is_keyframe;
2669 pkt->stream_index = st->index;
2671 if (additional_size > 0) {
2672 uint8_t *side_data = av_packet_new_side_data(pkt,
2673 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2674 additional_size + 8);
2675 if (side_data == NULL) {
2676 av_free_packet(pkt);
2678 return AVERROR(ENOMEM);
2680 AV_WB64(side_data, additional_id);
2681 memcpy(side_data + 8, additional, additional_size);
2684 if (discard_padding) {
2685 uint8_t *side_data = av_packet_new_side_data(pkt,
2686 AV_PKT_DATA_SKIP_SAMPLES,
2688 if (side_data == NULL) {
2689 av_free_packet(pkt);
2691 return AVERROR(ENOMEM);
2693 AV_WL32(side_data, 0);
2694 AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2695 (AVRational){1, 1000000000},
2696 (AVRational){1, st->codec->sample_rate}));
2699 if (track->ms_compat)
2700 pkt->dts = timecode;
2702 pkt->pts = timecode;
2704 if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2706 * For backward compatibility.
2707 * Historically, we have put subtitle duration
2708 * in convergence_duration, on the off chance
2709 * that the time_scale is less than 1us, which
2710 * could result in a 32bit overflow on the
2711 * normal duration field.
2713 pkt->convergence_duration = lace_duration;
2716 if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2717 lace_duration <= INT_MAX) {
2719 * For non subtitle tracks, just store the duration
2722 * If it's a subtitle track and duration value does
2723 * not overflow a uint32, then also store it normally.
2725 pkt->duration = lace_duration;
2729 if (st->codec->codec_id == AV_CODEC_ID_SSA)
2730 matroska_fix_ass_packet(matroska, pkt, lace_duration);
2732 if (matroska->prev_pkt &&
2733 timecode != AV_NOPTS_VALUE &&
2734 matroska->prev_pkt->pts == timecode &&
2735 matroska->prev_pkt->stream_index == st->index &&
2736 st->codec->codec_id == AV_CODEC_ID_SSA)
2737 matroska_merge_packets(matroska->prev_pkt, pkt);
2739 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2740 matroska->prev_pkt = pkt;
2743 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2744 matroska->prev_pkt = pkt;
2750 if (pkt_data != data)
2751 av_freep(&pkt_data);
2755 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2756 int size, int64_t pos, uint64_t cluster_time,
2757 uint64_t block_duration, int is_keyframe,
2758 uint8_t *additional, uint64_t additional_id, int additional_size,
2759 int64_t cluster_pos, int64_t discard_padding)
2761 uint64_t timecode = AV_NOPTS_VALUE;
2762 MatroskaTrack *track;
2766 uint32_t *lace_size = NULL;
2767 int n, flags, laces = 0;
2769 int trust_default_duration = 1;
2771 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2772 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2778 track = matroska_find_track_by_num(matroska, num);
2779 if (!track || !track->stream) {
2780 av_log(matroska->ctx, AV_LOG_INFO,
2781 "Invalid stream %"PRIu64" or size %u\n", num, size);
2782 return AVERROR_INVALIDDATA;
2783 } else if (size <= 3)
2786 if (st->discard >= AVDISCARD_ALL)
2788 av_assert1(block_duration != AV_NOPTS_VALUE);
2790 block_time = sign_extend(AV_RB16(data), 16);
2794 if (is_keyframe == -1)
2795 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2797 if (cluster_time != (uint64_t) -1 &&
2798 (block_time >= 0 || cluster_time >= -block_time)) {
2799 timecode = cluster_time + block_time - track->codec_delay;
2800 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2801 timecode < track->end_timecode)
2802 is_keyframe = 0; /* overlapping subtitles are not key frame */
2804 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2808 if (matroska->skip_to_keyframe &&
2809 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2810 if (timecode < matroska->skip_to_timecode)
2813 matroska->skip_to_keyframe = 0;
2814 else if (!st->skip_to_keyframe) {
2815 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2816 matroska->skip_to_keyframe = 0;
2820 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2821 &lace_size, &laces);
2826 if (track->audio.samplerate == 8000) {
2827 // If this is needed for more codecs, then add them here
2828 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2829 if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2830 trust_default_duration = 0;
2834 if (!block_duration && trust_default_duration)
2835 block_duration = track->default_duration * laces / matroska->time_scale;
2837 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2838 track->end_timecode =
2839 FFMAX(track->end_timecode, timecode + block_duration);
2841 for (n = 0; n < laces; n++) {
2842 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2844 if (lace_size[n] > size) {
2845 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2849 if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2850 st->codec->codec_id == AV_CODEC_ID_COOK ||
2851 st->codec->codec_id == AV_CODEC_ID_SIPR ||
2852 st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2853 st->codec->block_align && track->audio.sub_packet_size) {
2854 #if CONFIG_RA_288_DECODER || CONFIG_COOK_DECODER || CONFIG_ATRAC3_DECODER || CONFIG_SIPR_DECODER
2855 res = matroska_parse_rm_audio(matroska, track, st, data,
2859 res = AVERROR_INVALIDDATA;
2864 } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2865 res = matroska_parse_webvtt(matroska, track, st,
2867 timecode, lace_duration,
2872 res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2873 timecode, lace_duration, pos,
2874 !n ? is_keyframe : 0,
2875 additional, additional_id, additional_size,
2881 if (timecode != AV_NOPTS_VALUE)
2882 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2883 data += lace_size[n];
2884 size -= lace_size[n];
2892 static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2894 EbmlList *blocks_list;
2895 MatroskaBlock *blocks;
2897 res = ebml_parse(matroska,
2898 matroska_cluster_incremental_parsing,
2899 &matroska->current_cluster);
2902 if (matroska->current_cluster_pos)
2903 ebml_level_end(matroska);
2904 ebml_free(matroska_cluster, &matroska->current_cluster);
2905 memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2906 matroska->current_cluster_num_blocks = 0;
2907 matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2908 matroska->prev_pkt = NULL;
2909 /* sizeof the ID which was already read */
2910 if (matroska->current_id)
2911 matroska->current_cluster_pos -= 4;
2912 res = ebml_parse(matroska,
2913 matroska_clusters_incremental,
2914 &matroska->current_cluster);
2915 /* Try parsing the block again. */
2917 res = ebml_parse(matroska,
2918 matroska_cluster_incremental_parsing,
2919 &matroska->current_cluster);
2923 matroska->current_cluster_num_blocks <
2924 matroska->current_cluster.blocks.nb_elem) {
2925 blocks_list = &matroska->current_cluster.blocks;
2926 blocks = blocks_list->elem;
2928 matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2929 i = blocks_list->nb_elem - 1;
2930 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2931 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2932 uint8_t* additional = blocks[i].additional.size > 0 ?
2933 blocks[i].additional.data : NULL;
2934 if (!blocks[i].non_simple)
2935 blocks[i].duration = 0;
2936 res = matroska_parse_block(matroska, blocks[i].bin.data,
2937 blocks[i].bin.size, blocks[i].bin.pos,
2938 matroska->current_cluster.timecode,
2939 blocks[i].duration, is_keyframe,
2940 additional, blocks[i].additional_id,
2941 blocks[i].additional.size,
2942 matroska->current_cluster_pos,
2943 blocks[i].discard_padding);
2950 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2952 MatroskaCluster cluster = { 0 };
2953 EbmlList *blocks_list;
2954 MatroskaBlock *blocks;
2958 if (!matroska->contains_ssa)
2959 return matroska_parse_cluster_incremental(matroska);
2960 pos = avio_tell(matroska->ctx->pb);
2961 matroska->prev_pkt = NULL;
2962 if (matroska->current_id)
2963 pos -= 4; /* sizeof the ID which was already read */
2964 res = ebml_parse(matroska, matroska_clusters, &cluster);
2965 blocks_list = &cluster.blocks;
2966 blocks = blocks_list->elem;
2967 for (i = 0; i < blocks_list->nb_elem; i++)
2968 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2969 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2970 res = matroska_parse_block(matroska, blocks[i].bin.data,
2971 blocks[i].bin.size, blocks[i].bin.pos,
2972 cluster.timecode, blocks[i].duration,
2973 is_keyframe, NULL, 0, 0, pos,
2974 blocks[i].discard_padding);
2976 ebml_free(matroska_cluster, &cluster);
2980 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2982 MatroskaDemuxContext *matroska = s->priv_data;
2984 while (matroska_deliver_packet(matroska, pkt)) {
2985 int64_t pos = avio_tell(matroska->ctx->pb);
2988 if (matroska_parse_cluster(matroska) < 0)
2989 matroska_resync(matroska, pos);
2995 static int matroska_read_seek(AVFormatContext *s, int stream_index,
2996 int64_t timestamp, int flags)
2998 MatroskaDemuxContext *matroska = s->priv_data;
2999 MatroskaTrack *tracks = matroska->tracks.elem;
3000 AVStream *st = s->streams[stream_index];
3001 int i, index, index_sub, index_min;
3003 /* Parse the CUES now since we need the index data to seek. */
3004 if (matroska->cues_parsing_deferred > 0) {
3005 matroska->cues_parsing_deferred = 0;
3006 matroska_parse_cues(matroska);
3009 if (!st->nb_index_entries)
3011 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3013 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
3014 avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
3016 matroska->current_id = 0;
3017 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
3018 matroska_clear_queue(matroska);
3019 if (matroska_parse_cluster(matroska) < 0)
3024 matroska_clear_queue(matroska);
3025 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3029 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3030 tracks[i].audio.pkt_cnt = 0;
3031 tracks[i].audio.sub_packet_cnt = 0;
3032 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3033 tracks[i].end_timecode = 0;
3034 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3035 tracks[i].stream->discard != AVDISCARD_ALL) {
3036 index_sub = av_index_search_timestamp(
3037 tracks[i].stream, st->index_entries[index].timestamp,
3038 AVSEEK_FLAG_BACKWARD);
3039 while (index_sub >= 0 &&
3041 tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
3042 st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
3047 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
3048 matroska->current_id = 0;
3049 if (flags & AVSEEK_FLAG_ANY) {
3050 st->skip_to_keyframe = 0;
3051 matroska->skip_to_timecode = timestamp;
3053 st->skip_to_keyframe = 1;
3054 matroska->skip_to_timecode = st->index_entries[index].timestamp;
3056 matroska->skip_to_keyframe = 1;
3058 matroska->num_levels = 0;
3059 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3062 // slightly hackish but allows proper fallback to
3063 // the generic seeking code.
3064 matroska_clear_queue(matroska);
3065 matroska->current_id = 0;
3066 st->skip_to_keyframe =
3067 matroska->skip_to_keyframe = 0;
3069 matroska->num_levels = 0;
3073 static int matroska_read_close(AVFormatContext *s)
3075 MatroskaDemuxContext *matroska = s->priv_data;
3076 MatroskaTrack *tracks = matroska->tracks.elem;
3079 matroska_clear_queue(matroska);
3081 for (n = 0; n < matroska->tracks.nb_elem; n++)
3082 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3083 av_free(tracks[n].audio.buf);
3084 ebml_free(matroska_cluster, &matroska->current_cluster);
3085 ebml_free(matroska_segment, matroska);
3091 int64_t start_time_ns;
3092 int64_t end_time_ns;
3093 int64_t start_offset;
3097 /* This function searches all the Cues and returns the CueDesc corresponding the
3098 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3099 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3101 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3102 MatroskaDemuxContext *matroska = s->priv_data;
3105 int nb_index_entries = s->streams[0]->nb_index_entries;
3106 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3107 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3108 for (i = 1; i < nb_index_entries; i++) {
3109 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3110 index_entries[i].timestamp * matroska->time_scale > ts) {
3115 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3116 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3117 if (i != nb_index_entries - 1) {
3118 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3119 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3121 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3122 // FIXME: this needs special handling for files where Cues appear
3123 // before Clusters. the current logic assumes Cues appear after
3125 cue_desc.end_offset = cues_start - matroska->segment_start;
3130 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3132 MatroskaDemuxContext *matroska = s->priv_data;
3133 int64_t cluster_pos, before_pos;
3135 if (s->streams[0]->nb_index_entries <= 0) return 0;
3136 // seek to the first cluster using cues.
3137 index = av_index_search_timestamp(s->streams[0], 0, 0);
3138 if (index < 0) return 0;
3139 cluster_pos = s->streams[0]->index_entries[index].pos;
3140 before_pos = avio_tell(s->pb);
3142 int64_t cluster_id = 0, cluster_length = 0;
3144 avio_seek(s->pb, cluster_pos, SEEK_SET);
3145 // read cluster id and length
3146 ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
3147 ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3148 if (cluster_id != 0xF43B675) { // done with all clusters
3151 avio_seek(s->pb, cluster_pos, SEEK_SET);
3152 matroska->current_id = 0;
3153 matroska_clear_queue(matroska);
3154 if (matroska_parse_cluster(matroska) < 0 ||
3155 matroska->num_packets <= 0) {
3158 pkt = matroska->packets[0];
3159 cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
3160 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3165 avio_seek(s->pb, before_pos, SEEK_SET);
3169 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3170 double min_buffer, double* buffer,
3171 double* sec_to_download, AVFormatContext *s,
3174 double nano_seconds_per_second = 1000000000.0;
3175 double time_sec = time_ns / nano_seconds_per_second;
3177 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3178 int64_t end_time_ns = time_ns + time_to_search_ns;
3179 double sec_downloaded = 0.0;
3180 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3181 if (desc_curr.start_time_ns == -1)
3183 *sec_to_download = 0.0;
3185 // Check for non cue start time.
3186 if (time_ns > desc_curr.start_time_ns) {
3187 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3188 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3189 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3190 double timeToDownload = (cueBytes * 8.0) / bps;
3192 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3193 *sec_to_download += timeToDownload;
3195 // Check if the search ends within the first cue.
3196 if (desc_curr.end_time_ns >= end_time_ns) {
3197 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3198 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3199 sec_downloaded = percent_to_sub * sec_downloaded;
3200 *sec_to_download = percent_to_sub * *sec_to_download;
3203 if ((sec_downloaded + *buffer) <= min_buffer) {
3207 // Get the next Cue.
3208 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3211 while (desc_curr.start_time_ns != -1) {
3212 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3213 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3214 double desc_sec = desc_ns / nano_seconds_per_second;
3215 double bits = (desc_bytes * 8.0);
3216 double time_to_download = bits / bps;
3218 sec_downloaded += desc_sec - time_to_download;
3219 *sec_to_download += time_to_download;
3221 if (desc_curr.end_time_ns >= end_time_ns) {
3222 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3223 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3224 sec_downloaded = percent_to_sub * sec_downloaded;
3225 *sec_to_download = percent_to_sub * *sec_to_download;
3227 if ((sec_downloaded + *buffer) <= min_buffer)
3232 if ((sec_downloaded + *buffer) <= min_buffer) {
3237 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3239 *buffer = *buffer + sec_downloaded;
3243 /* This function computes the bandwidth of the WebM file with the help of
3244 * buffer_size_after_time_downloaded() function. Both of these functions are
3245 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3246 * Matroska parsing mechanism.
3248 * Returns the bandwidth of the file on success; -1 on error.
3250 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3252 MatroskaDemuxContext *matroska = s->priv_data;
3253 AVStream *st = s->streams[0];
3254 double bandwidth = 0.0;
3257 for (i = 0; i < st->nb_index_entries; i++) {
3258 int64_t prebuffer_ns = 1000000000;
3259 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3260 double nano_seconds_per_second = 1000000000.0;
3261 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3262 double prebuffer_bytes = 0.0;
3263 int64_t temp_prebuffer_ns = prebuffer_ns;
3264 int64_t pre_bytes, pre_ns;
3265 double pre_sec, prebuffer, bits_per_second;
3266 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3268 // Start with the first Cue.
3269 CueDesc desc_end = desc_beg;
3271 // Figure out how much data we have downloaded for the prebuffer. This will
3272 // be used later to adjust the bits per sample to try.
3273 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3274 // Prebuffered the entire Cue.
3275 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3276 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3277 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3279 if (desc_end.start_time_ns == -1) {
3280 // The prebuffer is larger than the duration.
3281 return (matroska->duration * matroska->time_scale >= prebuffered_ns) ? -1 : 0;
3284 // The prebuffer ends in the last Cue. Estimate how much data was
3286 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3287 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3288 pre_sec = pre_ns / nano_seconds_per_second;
3290 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3292 prebuffer = prebuffer_ns / nano_seconds_per_second;
3294 // Set this to 0.0 in case our prebuffer buffers the entire video.
3295 bits_per_second = 0.0;
3297 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3298 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3299 double desc_sec = desc_ns / nano_seconds_per_second;
3300 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3302 // Drop the bps by the percentage of bytes buffered.
3303 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3304 double mod_bits_per_second = calc_bits_per_second * percent;
3306 if (prebuffer < desc_sec) {
3308 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3310 // Add 1 so the bits per second should be a little bit greater than file
3312 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3313 const double min_buffer = 0.0;
3314 double buffer = prebuffer;
3315 double sec_to_download = 0.0;
3317 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3318 min_buffer, &buffer, &sec_to_download,
3322 } else if (rv == 0) {
3323 bits_per_second = (double)(bps);
3328 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3329 } while (desc_end.start_time_ns != -1);
3330 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3332 return (int64_t)bandwidth;
3335 static int webm_dash_manifest_cues(AVFormatContext *s)
3337 MatroskaDemuxContext *matroska = s->priv_data;
3338 EbmlList *seekhead_list = &matroska->seekhead;
3339 MatroskaSeekhead *seekhead = seekhead_list->elem;
3341 int64_t cues_start, cues_end, before_pos, bandwidth;
3344 // determine cues start and end positions
3345 for (i = 0; i < seekhead_list->nb_elem; i++)
3346 if (seekhead[i].id == MATROSKA_ID_CUES)
3349 if (i >= seekhead_list->nb_elem) return -1;
3351 before_pos = avio_tell(matroska->ctx->pb);
3352 cues_start = seekhead[i].pos + matroska->segment_start;
3353 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
3354 uint64_t cues_length = 0, cues_id = 0;
3355 ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
3356 ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
3357 cues_end = cues_start + cues_length + 11; // 11 is the offset of Cues ID.
3359 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3362 matroska_parse_cues(matroska);
3365 buf = av_asprintf("%" PRId64, cues_start);
3366 if (!buf) return AVERROR(ENOMEM);
3367 av_dict_set(&s->streams[0]->metadata, CUES_START, buf, 0);
3371 buf = av_asprintf("%" PRId64, cues_end);
3372 if (!buf) return AVERROR(ENOMEM);
3373 av_dict_set(&s->streams[0]->metadata, CUES_END, buf, 0);
3377 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
3378 if (bandwidth < 0) return -1;
3379 buf = av_asprintf("%" PRId64, bandwidth);
3380 if (!buf) return AVERROR(ENOMEM);
3381 av_dict_set(&s->streams[0]->metadata, BANDWIDTH, buf, 0);
3384 // check if all clusters start with key frames
3385 buf = av_asprintf("%d", webm_clusters_start_with_keyframe(s));
3386 if (!buf) return AVERROR(ENOMEM);
3387 av_dict_set(&s->streams[0]->metadata, CLUSTER_KEYFRAME, buf, 0);
3390 // store cue point timestamps as a comma separated list for checking subsegment alignment in
3391 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3392 buf = av_malloc(s->streams[0]->nb_index_entries * 20 * sizeof(char));
3393 if (!buf) return -1;
3395 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
3396 snprintf(buf, (i + 1) * 20 * sizeof(char),
3397 "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
3398 if (i != s->streams[0]->nb_index_entries - 1)
3399 strncat(buf, ",", sizeof(char));
3401 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
3407 static int webm_dash_manifest_read_header(AVFormatContext *s)
3410 int ret = matroska_read_header(s);
3411 MatroskaTrack *tracks;
3412 MatroskaDemuxContext *matroska = s->priv_data;
3414 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
3418 // initialization range
3419 buf = av_asprintf("%" PRId64, avio_tell(s->pb) - 5); // 5 is the offset of Cluster ID.
3420 if (!buf) return AVERROR(ENOMEM);
3421 av_dict_set(&s->streams[0]->metadata, INITIALIZATION_RANGE, buf, 0);
3424 // basename of the file
3425 buf = strrchr(s->filename, '/');
3426 if (buf == NULL) return -1;
3427 av_dict_set(&s->streams[0]->metadata, FILENAME, ++buf, 0);
3430 buf = av_asprintf("%g", matroska->duration);
3431 if (!buf) return AVERROR(ENOMEM);
3432 av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
3436 tracks = matroska->tracks.elem;
3437 buf = av_asprintf("%" PRId64, tracks[0].num);
3438 if (!buf) return AVERROR(ENOMEM);
3439 av_dict_set(&s->streams[0]->metadata, TRACK_NUMBER, buf, 0);
3442 // parse the cues and populate Cue related fields
3443 return webm_dash_manifest_cues(s);
3446 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
3451 AVInputFormat ff_matroska_demuxer = {
3452 .name = "matroska,webm",
3453 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3454 .priv_data_size = sizeof(MatroskaDemuxContext),
3455 .read_probe = matroska_probe,
3456 .read_header = matroska_read_header,
3457 .read_packet = matroska_read_packet,
3458 .read_close = matroska_read_close,
3459 .read_seek = matroska_read_seek,
3460 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3463 AVInputFormat ff_webm_dash_manifest_demuxer = {
3464 .name = "webm_dash_manifest",
3465 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
3466 .priv_data_size = sizeof(MatroskaDemuxContext),
3467 .read_header = webm_dash_manifest_read_header,
3468 .read_packet = webm_dash_manifest_read_packet,
3469 .read_close = matroska_read_close,