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"
49 #include "libavutil/time_internal.h"
51 #include "libavcodec/bytestream.h"
52 #include "libavcodec/flac.h"
53 #include "libavcodec/mpeg4audio.h"
56 #include "avio_internal.h"
61 /* For ff_codec_get_id(). */
79 typedef const struct EbmlSyntax {
88 const struct EbmlSyntax *n;
108 uint64_t doctype_version;
114 } MatroskaTrackCompression;
119 } MatroskaTrackEncryption;
124 MatroskaTrackCompression compression;
125 MatroskaTrackEncryption encryption;
126 } MatroskaTrackEncoding;
130 uint64_t display_width;
131 uint64_t display_height;
132 uint64_t pixel_width;
133 uint64_t pixel_height;
135 uint64_t stereo_mode;
137 } MatroskaTrackVideo;
141 double out_samplerate;
145 /* real audio header (extracted from extradata) */
152 uint64_t buf_timecode;
154 } MatroskaTrackAudio;
159 } MatroskaTrackPlane;
162 EbmlList combine_planes;
163 } MatroskaTrackOperation;
174 uint64_t default_duration;
175 uint64_t flag_default;
176 uint64_t flag_forced;
177 uint64_t seek_preroll;
178 MatroskaTrackVideo video;
179 MatroskaTrackAudio audio;
180 MatroskaTrackOperation operation;
182 uint64_t codec_delay;
185 int64_t end_timecode;
187 uint64_t max_block_additional_id;
197 } MatroskaAttachment;
235 MatroskaTagTarget target;
255 AVFormatContext *ctx;
259 MatroskaLevel levels[EBML_MAX_DEPTH];
269 EbmlList attachments;
275 /* byte position of the segment inside the stream */
276 int64_t segment_start;
278 /* the packet queue */
285 /* What to skip before effectively reading a packet. */
286 int skip_to_keyframe;
287 uint64_t skip_to_timecode;
289 /* File has a CUES element, but we defer parsing until it is needed. */
290 int cues_parsing_deferred;
292 int current_cluster_num_blocks;
293 int64_t current_cluster_pos;
294 MatroskaCluster current_cluster;
296 /* File has SSA subtitles which prevent incremental cluster parsing. */
298 } MatroskaDemuxContext;
305 uint64_t additional_id;
307 int64_t discard_padding;
310 static EbmlSyntax ebml_header[] = {
311 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
312 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
313 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
314 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
315 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
316 { EBML_ID_EBMLVERSION, EBML_NONE },
317 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
321 static EbmlSyntax ebml_syntax[] = {
322 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
326 static EbmlSyntax matroska_info[] = {
327 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
328 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
329 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
330 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
331 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
332 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
333 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
337 static EbmlSyntax matroska_track_video[] = {
338 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
339 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
340 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
341 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
342 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
343 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
344 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
345 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
346 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
347 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
348 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
349 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
350 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
351 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
352 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
356 static EbmlSyntax matroska_track_audio[] = {
357 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
358 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
359 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
360 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
364 static EbmlSyntax matroska_track_encoding_compression[] = {
365 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
366 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
370 static EbmlSyntax matroska_track_encoding_encryption[] = {
371 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
372 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
373 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
374 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
375 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
376 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
377 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
380 static EbmlSyntax matroska_track_encoding[] = {
381 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
382 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
383 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
384 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
385 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
389 static EbmlSyntax matroska_track_encodings[] = {
390 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
394 static EbmlSyntax matroska_track_plane[] = {
395 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
396 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
400 static EbmlSyntax matroska_track_combine_planes[] = {
401 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
405 static EbmlSyntax matroska_track_operation[] = {
406 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
410 static EbmlSyntax matroska_track[] = {
411 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
412 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
413 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
414 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
415 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
416 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
417 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
418 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
419 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
420 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
421 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
422 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
423 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
424 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
425 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
426 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
427 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
428 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
429 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
430 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
431 { MATROSKA_ID_CODECNAME, EBML_NONE },
432 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
433 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
434 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
435 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
436 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
440 static EbmlSyntax matroska_tracks[] = {
441 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
445 static EbmlSyntax matroska_attachment[] = {
446 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
447 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
448 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
449 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
450 { MATROSKA_ID_FILEDESC, EBML_NONE },
454 static EbmlSyntax matroska_attachments[] = {
455 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
459 static EbmlSyntax matroska_chapter_display[] = {
460 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
461 { MATROSKA_ID_CHAPLANG, EBML_NONE },
465 static EbmlSyntax matroska_chapter_entry[] = {
466 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
467 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
468 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
469 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
470 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
471 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
472 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
473 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
477 static EbmlSyntax matroska_chapter[] = {
478 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
479 { MATROSKA_ID_EDITIONUID, EBML_NONE },
480 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
481 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
482 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
486 static EbmlSyntax matroska_chapters[] = {
487 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
491 static EbmlSyntax matroska_index_pos[] = {
492 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
493 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
494 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
495 { MATROSKA_ID_CUEDURATION, EBML_NONE },
496 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
500 static EbmlSyntax matroska_index_entry[] = {
501 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
502 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
506 static EbmlSyntax matroska_index[] = {
507 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
511 static EbmlSyntax matroska_simpletag[] = {
512 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
513 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
514 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
515 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
516 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
517 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
521 static EbmlSyntax matroska_tagtargets[] = {
522 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
523 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
524 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
525 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
526 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
530 static EbmlSyntax matroska_tag[] = {
531 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
532 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
536 static EbmlSyntax matroska_tags[] = {
537 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
541 static EbmlSyntax matroska_seekhead_entry[] = {
542 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
543 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
547 static EbmlSyntax matroska_seekhead[] = {
548 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
552 static EbmlSyntax matroska_segment[] = {
553 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } },
554 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } },
555 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } },
556 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } },
557 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } },
558 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } },
559 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } },
560 { MATROSKA_ID_CLUSTER, EBML_STOP },
564 static EbmlSyntax matroska_segments[] = {
565 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
569 static EbmlSyntax matroska_blockmore[] = {
570 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
571 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
575 static EbmlSyntax matroska_blockadditions[] = {
576 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
580 static EbmlSyntax matroska_blockgroup[] = {
581 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
582 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
583 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
584 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
585 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
586 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
587 { MATROSKA_ID_CODECSTATE, EBML_NONE },
588 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
592 static EbmlSyntax matroska_cluster[] = {
593 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
594 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
595 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
596 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
597 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
601 static EbmlSyntax matroska_clusters[] = {
602 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
603 { MATROSKA_ID_INFO, EBML_NONE },
604 { MATROSKA_ID_CUES, EBML_NONE },
605 { MATROSKA_ID_TAGS, EBML_NONE },
606 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
610 static EbmlSyntax matroska_cluster_incremental_parsing[] = {
611 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
612 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
613 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
614 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
615 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
616 { MATROSKA_ID_INFO, EBML_NONE },
617 { MATROSKA_ID_CUES, EBML_NONE },
618 { MATROSKA_ID_TAGS, EBML_NONE },
619 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
620 { MATROSKA_ID_CLUSTER, EBML_STOP },
624 static EbmlSyntax matroska_cluster_incremental[] = {
625 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
626 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
627 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
628 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
629 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
633 static EbmlSyntax matroska_clusters_incremental[] = {
634 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
635 { MATROSKA_ID_INFO, EBML_NONE },
636 { MATROSKA_ID_CUES, EBML_NONE },
637 { MATROSKA_ID_TAGS, EBML_NONE },
638 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
642 static const char *const matroska_doctypes[] = { "matroska", "webm" };
644 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
646 AVIOContext *pb = matroska->ctx->pb;
648 matroska->current_id = 0;
649 matroska->num_levels = 0;
651 /* seek to next position to resync from */
652 if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
657 // try to find a toplevel element
658 while (!avio_feof(pb)) {
659 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
660 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
661 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
662 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
663 matroska->current_id = id;
666 id = (id << 8) | avio_r8(pb);
675 * Return: Whether we reached the end of a level in the hierarchy or not.
677 static int ebml_level_end(MatroskaDemuxContext *matroska)
679 AVIOContext *pb = matroska->ctx->pb;
680 int64_t pos = avio_tell(pb);
682 if (matroska->num_levels > 0) {
683 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
684 if (pos - level->start >= level->length || matroska->current_id) {
685 matroska->num_levels--;
693 * Read: an "EBML number", which is defined as a variable-length
694 * array of bytes. The first byte indicates the length by giving a
695 * number of 0-bits followed by a one. The position of the first
696 * "one" bit inside the first byte indicates the length of this
698 * Returns: number of bytes read, < 0 on error
700 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
701 int max_size, uint64_t *number)
706 /* The first byte tells us the length in bytes - avio_r8() can normally
707 * return 0, but since that's not a valid first ebmlID byte, we can
708 * use it safely here to catch EOS. */
709 if (!(total = avio_r8(pb))) {
710 /* we might encounter EOS here */
711 if (!avio_feof(pb)) {
712 int64_t pos = avio_tell(pb);
713 av_log(matroska->ctx, AV_LOG_ERROR,
714 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
716 return pb->error ? pb->error : AVERROR(EIO);
721 /* get the length of the EBML number */
722 read = 8 - ff_log2_tab[total];
723 if (read > max_size) {
724 int64_t pos = avio_tell(pb) - 1;
725 av_log(matroska->ctx, AV_LOG_ERROR,
726 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
727 (uint8_t) total, pos, pos);
728 return AVERROR_INVALIDDATA;
731 /* read out length */
732 total ^= 1 << ff_log2_tab[total];
734 total = (total << 8) | avio_r8(pb);
742 * Read a EBML length value.
743 * This needs special handling for the "unknown length" case which has multiple
746 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
749 int res = ebml_read_num(matroska, pb, 8, number);
750 if (res > 0 && *number + 1 == 1ULL << (7 * res))
751 *number = 0xffffffffffffffULL;
756 * Read the next element as an unsigned int.
757 * 0 is success, < 0 is failure.
759 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
764 return AVERROR_INVALIDDATA;
766 /* big-endian ordering; build up number */
769 *num = (*num << 8) | avio_r8(pb);
775 * Read the next element as a signed int.
776 * 0 is success, < 0 is failure.
778 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
783 return AVERROR_INVALIDDATA;
788 *num = sign_extend(avio_r8(pb), 8);
790 /* big-endian ordering; build up number */
792 *num = (*num << 8) | avio_r8(pb);
799 * Read the next element as a float.
800 * 0 is success, < 0 is failure.
802 static int ebml_read_float(AVIOContext *pb, int size, double *num)
807 *num = av_int2float(avio_rb32(pb));
809 *num = av_int2double(avio_rb64(pb));
811 return AVERROR_INVALIDDATA;
817 * Read the next element as an ASCII string.
818 * 0 is success, < 0 is failure.
820 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
824 /* EBML strings are usually not 0-terminated, so we allocate one
825 * byte more, read the string and NULL-terminate it ourselves. */
826 if (!(res = av_malloc(size + 1)))
827 return AVERROR(ENOMEM);
828 if (avio_read(pb, (uint8_t *) res, size) != size) {
840 * Read the next element as binary data.
841 * 0 is success, < 0 is failure.
843 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
845 av_fast_padded_malloc(&bin->data, &bin->size, length);
847 return AVERROR(ENOMEM);
850 bin->pos = avio_tell(pb);
851 if (avio_read(pb, bin->data, length) != length) {
852 av_freep(&bin->data);
861 * Read the next element, but only the header. The contents
862 * are supposed to be sub-elements which can be read separately.
863 * 0 is success, < 0 is failure.
865 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
867 AVIOContext *pb = matroska->ctx->pb;
868 MatroskaLevel *level;
870 if (matroska->num_levels >= EBML_MAX_DEPTH) {
871 av_log(matroska->ctx, AV_LOG_ERROR,
872 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
873 return AVERROR(ENOSYS);
876 level = &matroska->levels[matroska->num_levels++];
877 level->start = avio_tell(pb);
878 level->length = length;
884 * Read signed/unsigned "EBML" numbers.
885 * Return: number of bytes processed, < 0 on error
887 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
888 uint8_t *data, uint32_t size, uint64_t *num)
891 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
892 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
896 * Same as above, but signed.
898 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
899 uint8_t *data, uint32_t size, int64_t *num)
904 /* read as unsigned number first */
905 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
908 /* make signed (weird way) */
909 *num = unum - ((1LL << (7 * res - 1)) - 1);
914 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
915 EbmlSyntax *syntax, void *data);
917 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
918 uint32_t id, void *data)
921 for (i = 0; syntax[i].id; i++)
922 if (id == syntax[i].id)
924 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
925 matroska->num_levels > 0 &&
926 matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
927 return 0; // we reached the end of an unknown size cluster
928 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
929 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%"PRIX32"\n", id);
930 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
931 return AVERROR_INVALIDDATA;
933 return ebml_parse_elem(matroska, &syntax[i], data);
936 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
939 if (!matroska->current_id) {
941 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
944 matroska->current_id = id | 1 << 7 * res;
946 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
949 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
954 for (i = 0; syntax[i].id; i++)
955 switch (syntax[i].type) {
957 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
960 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
964 // the default may be NULL
965 if (syntax[i].def.s) {
966 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
967 *dst = av_strdup(syntax[i].def.s);
969 return AVERROR(ENOMEM);
974 while (!res && !ebml_level_end(matroska))
975 res = ebml_parse(matroska, syntax, data);
980 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
981 EbmlSyntax *syntax, void *data)
983 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
986 // max. 16 MB for strings
987 [EBML_STR] = 0x1000000,
988 [EBML_UTF8] = 0x1000000,
989 // max. 256 MB for binary data
990 [EBML_BIN] = 0x10000000,
991 // no limits for anything else
993 AVIOContext *pb = matroska->ctx->pb;
994 uint32_t id = syntax->id;
999 data = (char *) data + syntax->data_offset;
1000 if (syntax->list_elem_size) {
1001 EbmlList *list = data;
1002 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1004 return AVERROR(ENOMEM);
1005 list->elem = newelem;
1006 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1007 memset(data, 0, syntax->list_elem_size);
1011 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1012 matroska->current_id = 0;
1013 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1015 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1016 av_log(matroska->ctx, AV_LOG_ERROR,
1017 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1018 length, max_lengths[syntax->type], syntax->type);
1019 return AVERROR_INVALIDDATA;
1023 switch (syntax->type) {
1025 res = ebml_read_uint(pb, length, data);
1028 res = ebml_read_sint(pb, length, data);
1031 res = ebml_read_float(pb, length, data);
1035 res = ebml_read_ascii(pb, length, data);
1038 res = ebml_read_binary(pb, length, data);
1041 if ((res = ebml_read_master(matroska, length)) < 0)
1043 if (id == MATROSKA_ID_SEGMENT)
1044 matroska->segment_start = avio_tell(matroska->ctx->pb);
1045 return ebml_parse_nest(matroska, syntax->def.n, data);
1047 return ebml_parse_id(matroska, syntax->def.n, id, data);
1051 if (ffio_limit(pb, length) != length)
1052 return AVERROR(EIO);
1053 return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1055 if (res == AVERROR_INVALIDDATA)
1056 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1057 else if (res == AVERROR(EIO))
1058 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1062 static void ebml_free(EbmlSyntax *syntax, void *data)
1065 for (i = 0; syntax[i].id; i++) {
1066 void *data_off = (char *) data + syntax[i].data_offset;
1067 switch (syntax[i].type) {
1073 av_freep(&((EbmlBin *) data_off)->data);
1076 if (syntax[i].list_elem_size) {
1077 EbmlList *list = data_off;
1078 char *ptr = list->elem;
1079 for (j = 0; j < list->nb_elem;
1080 j++, ptr += syntax[i].list_elem_size)
1081 ebml_free(syntax[i].def.n, ptr);
1082 av_free(list->elem);
1084 ebml_free(syntax[i].def.n, data_off);
1094 static int matroska_probe(AVProbeData *p)
1097 int len_mask = 0x80, size = 1, n = 1, i;
1100 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1103 /* length of header */
1105 while (size <= 8 && !(total & len_mask)) {
1111 total &= (len_mask - 1);
1113 total = (total << 8) | p->buf[4 + n++];
1115 /* Does the probe data contain the whole header? */
1116 if (p->buf_size < 4 + size + total)
1119 /* The header should contain a known document type. For now,
1120 * we don't parse the whole header but simply check for the
1121 * availability of that array of characters inside the header.
1122 * Not fully fool-proof, but good enough. */
1123 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1124 int probelen = strlen(matroska_doctypes[i]);
1125 if (total < probelen)
1127 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1128 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1129 return AVPROBE_SCORE_MAX;
1132 // probably valid EBML header but no recognized doctype
1133 return AVPROBE_SCORE_EXTENSION;
1136 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1139 MatroskaTrack *tracks = matroska->tracks.elem;
1142 for (i = 0; i < matroska->tracks.nb_elem; i++)
1143 if (tracks[i].num == num)
1146 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1150 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1151 MatroskaTrack *track)
1153 MatroskaTrackEncoding *encodings = track->encodings.elem;
1154 uint8_t *data = *buf;
1155 int isize = *buf_size;
1156 uint8_t *pkt_data = NULL;
1157 uint8_t av_unused *newpktdata;
1158 int pkt_size = isize;
1162 if (pkt_size >= 10000000U)
1163 return AVERROR_INVALIDDATA;
1165 switch (encodings[0].compression.algo) {
1166 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1168 int header_size = encodings[0].compression.settings.size;
1169 uint8_t *header = encodings[0].compression.settings.data;
1171 if (header_size && !header) {
1172 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1179 pkt_size = isize + header_size;
1180 pkt_data = av_malloc(pkt_size);
1182 return AVERROR(ENOMEM);
1184 memcpy(pkt_data, header, header_size);
1185 memcpy(pkt_data + header_size, data, isize);
1189 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1191 olen = pkt_size *= 3;
1192 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1194 result = AVERROR(ENOMEM);
1197 pkt_data = newpktdata;
1198 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1199 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1201 result = AVERROR_INVALIDDATA;
1208 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1210 z_stream zstream = { 0 };
1211 if (inflateInit(&zstream) != Z_OK)
1213 zstream.next_in = data;
1214 zstream.avail_in = isize;
1217 newpktdata = av_realloc(pkt_data, pkt_size);
1219 inflateEnd(&zstream);
1222 pkt_data = newpktdata;
1223 zstream.avail_out = pkt_size - zstream.total_out;
1224 zstream.next_out = pkt_data + zstream.total_out;
1226 result = inflate(&zstream, Z_NO_FLUSH);
1228 result = Z_MEM_ERROR;
1229 } while (result == Z_OK && pkt_size < 10000000);
1230 pkt_size = zstream.total_out;
1231 inflateEnd(&zstream);
1232 if (result != Z_STREAM_END) {
1233 if (result == Z_MEM_ERROR)
1234 result = AVERROR(ENOMEM);
1236 result = AVERROR_INVALIDDATA;
1243 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1245 bz_stream bzstream = { 0 };
1246 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1248 bzstream.next_in = data;
1249 bzstream.avail_in = isize;
1252 newpktdata = av_realloc(pkt_data, pkt_size);
1254 BZ2_bzDecompressEnd(&bzstream);
1257 pkt_data = newpktdata;
1258 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1259 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1261 result = BZ2_bzDecompress(&bzstream);
1263 result = BZ_MEM_ERROR;
1264 } while (result == BZ_OK && pkt_size < 10000000);
1265 pkt_size = bzstream.total_out_lo32;
1266 BZ2_bzDecompressEnd(&bzstream);
1267 if (result != BZ_STREAM_END) {
1268 if (result == BZ_MEM_ERROR)
1269 result = AVERROR(ENOMEM);
1271 result = AVERROR_INVALIDDATA;
1278 return AVERROR_INVALIDDATA;
1282 *buf_size = pkt_size;
1290 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1291 AVDictionary **metadata, char *prefix)
1293 MatroskaTag *tags = list->elem;
1297 for (i = 0; i < list->nb_elem; i++) {
1298 const char *lang = tags[i].lang &&
1299 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1301 if (!tags[i].name) {
1302 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1306 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1308 av_strlcpy(key, tags[i].name, sizeof(key));
1309 if (tags[i].def || !lang) {
1310 av_dict_set(metadata, key, tags[i].string, 0);
1311 if (tags[i].sub.nb_elem)
1312 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1315 av_strlcat(key, "-", sizeof(key));
1316 av_strlcat(key, lang, sizeof(key));
1317 av_dict_set(metadata, key, tags[i].string, 0);
1318 if (tags[i].sub.nb_elem)
1319 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1322 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1325 static void matroska_convert_tags(AVFormatContext *s)
1327 MatroskaDemuxContext *matroska = s->priv_data;
1328 MatroskaTags *tags = matroska->tags.elem;
1331 for (i = 0; i < matroska->tags.nb_elem; i++) {
1332 if (tags[i].target.attachuid) {
1333 MatroskaAttachment *attachment = matroska->attachments.elem;
1334 for (j = 0; j < matroska->attachments.nb_elem; j++)
1335 if (attachment[j].uid == tags[i].target.attachuid &&
1336 attachment[j].stream)
1337 matroska_convert_tag(s, &tags[i].tag,
1338 &attachment[j].stream->metadata, NULL);
1339 } else if (tags[i].target.chapteruid) {
1340 MatroskaChapter *chapter = matroska->chapters.elem;
1341 for (j = 0; j < matroska->chapters.nb_elem; j++)
1342 if (chapter[j].uid == tags[i].target.chapteruid &&
1344 matroska_convert_tag(s, &tags[i].tag,
1345 &chapter[j].chapter->metadata, NULL);
1346 } else if (tags[i].target.trackuid) {
1347 MatroskaTrack *track = matroska->tracks.elem;
1348 for (j = 0; j < matroska->tracks.nb_elem; j++)
1349 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1350 matroska_convert_tag(s, &tags[i].tag,
1351 &track[j].stream->metadata, NULL);
1353 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1354 tags[i].target.type);
1359 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1362 EbmlList *seekhead_list = &matroska->seekhead;
1363 uint32_t level_up = matroska->level_up;
1364 uint32_t saved_id = matroska->current_id;
1365 MatroskaSeekhead *seekhead = seekhead_list->elem;
1366 int64_t before_pos = avio_tell(matroska->ctx->pb);
1367 MatroskaLevel level;
1371 if (idx >= seekhead_list->nb_elem ||
1372 seekhead[idx].id == MATROSKA_ID_SEEKHEAD ||
1373 seekhead[idx].id == MATROSKA_ID_CLUSTER)
1377 offset = seekhead[idx].pos + matroska->segment_start;
1378 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1379 /* We don't want to lose our seekhead level, so we add
1380 * a dummy. This is a crude hack. */
1381 if (matroska->num_levels == EBML_MAX_DEPTH) {
1382 av_log(matroska->ctx, AV_LOG_INFO,
1383 "Max EBML element depth (%d) reached, "
1384 "cannot parse further.\n", EBML_MAX_DEPTH);
1385 ret = AVERROR_INVALIDDATA;
1388 level.length = (uint64_t) -1;
1389 matroska->levels[matroska->num_levels] = level;
1390 matroska->num_levels++;
1391 matroska->current_id = 0;
1393 ret = ebml_parse(matroska, matroska_segment, matroska);
1395 /* remove dummy level */
1396 while (matroska->num_levels) {
1397 uint64_t length = matroska->levels[--matroska->num_levels].length;
1398 if (length == (uint64_t) -1)
1404 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1405 matroska->level_up = level_up;
1406 matroska->current_id = saved_id;
1411 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1413 EbmlList *seekhead_list = &matroska->seekhead;
1414 int64_t before_pos = avio_tell(matroska->ctx->pb);
1417 // we should not do any seeking in the streaming case
1418 if (!matroska->ctx->pb->seekable ||
1419 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1422 for (i = 0; i < seekhead_list->nb_elem; i++) {
1423 MatroskaSeekhead *seekhead = seekhead_list->elem;
1424 if (seekhead[i].pos <= before_pos)
1427 // defer cues parsing until we actually need cue data.
1428 if (seekhead[i].id == MATROSKA_ID_CUES) {
1429 matroska->cues_parsing_deferred = 1;
1433 if (matroska_parse_seekhead_entry(matroska, i) < 0) {
1434 // mark index as broken
1435 matroska->cues_parsing_deferred = -1;
1441 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1443 EbmlList *index_list;
1444 MatroskaIndex *index;
1445 int index_scale = 1;
1448 index_list = &matroska->index;
1449 index = index_list->elem;
1450 if (index_list->nb_elem &&
1451 index[0].time > 1E14 / matroska->time_scale) {
1452 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1453 index_scale = matroska->time_scale;
1455 for (i = 0; i < index_list->nb_elem; i++) {
1456 EbmlList *pos_list = &index[i].pos;
1457 MatroskaIndexPos *pos = pos_list->elem;
1458 for (j = 0; j < pos_list->nb_elem; j++) {
1459 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1461 if (track && track->stream)
1462 av_add_index_entry(track->stream,
1463 pos[j].pos + matroska->segment_start,
1464 index[i].time / index_scale, 0, 0,
1470 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1471 EbmlList *seekhead_list = &matroska->seekhead;
1472 MatroskaSeekhead *seekhead = seekhead_list->elem;
1475 for (i = 0; i < seekhead_list->nb_elem; i++)
1476 if (seekhead[i].id == MATROSKA_ID_CUES)
1478 av_assert1(i <= seekhead_list->nb_elem);
1480 if (matroska_parse_seekhead_entry(matroska, i) < 0)
1481 matroska->cues_parsing_deferred = -1;
1482 matroska_add_index_entries(matroska);
1485 static int matroska_aac_profile(char *codec_id)
1487 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1490 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1491 if (strstr(codec_id, aac_profiles[profile]))
1496 static int matroska_aac_sri(int samplerate)
1500 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1501 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1506 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1509 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1510 time_t creation_time = date_utc / 1000000000 + 978307200;
1511 struct tm tmpbuf, *ptm = gmtime_r(&creation_time, &tmpbuf);
1513 if (strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm))
1514 av_dict_set(metadata, "creation_time", buffer, 0);
1517 static int matroska_parse_flac(AVFormatContext *s,
1518 MatroskaTrack *track,
1521 AVStream *st = track->stream;
1522 uint8_t *p = track->codec_priv.data;
1523 int size = track->codec_priv.size;
1525 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1526 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1527 track->codec_priv.size = 0;
1531 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1533 p += track->codec_priv.size;
1534 size -= track->codec_priv.size;
1536 /* parse the remaining metadata blocks if present */
1538 int block_last, block_type, block_size;
1540 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1544 if (block_size > size)
1547 /* check for the channel mask */
1548 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1549 AVDictionary *dict = NULL;
1550 AVDictionaryEntry *chmask;
1552 ff_vorbis_comment(s, &dict, p, block_size, 0);
1553 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1555 uint64_t mask = strtol(chmask->value, NULL, 0);
1556 if (!mask || mask & ~0x3ffffULL) {
1557 av_log(s, AV_LOG_WARNING,
1558 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1560 st->codec->channel_layout = mask;
1562 av_dict_free(&dict);
1572 static int matroska_parse_tracks(AVFormatContext *s)
1574 MatroskaDemuxContext *matroska = s->priv_data;
1575 MatroskaTrack *tracks = matroska->tracks.elem;
1580 for (i = 0; i < matroska->tracks.nb_elem; i++) {
1581 MatroskaTrack *track = &tracks[i];
1582 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1583 EbmlList *encodings_list = &track->encodings;
1584 MatroskaTrackEncoding *encodings = encodings_list->elem;
1585 uint8_t *extradata = NULL;
1586 int extradata_size = 0;
1587 int extradata_offset = 0;
1588 uint32_t fourcc = 0;
1590 char* key_id_base64 = NULL;
1593 /* Apply some sanity checks. */
1594 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1595 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1596 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1597 track->type != MATROSKA_TRACK_TYPE_METADATA) {
1598 av_log(matroska->ctx, AV_LOG_INFO,
1599 "Unknown or unsupported track type %"PRIu64"\n",
1603 if (!track->codec_id)
1606 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1607 if (!track->default_duration && track->video.frame_rate > 0)
1608 track->default_duration = 1000000000 / track->video.frame_rate;
1609 if (track->video.display_width == -1)
1610 track->video.display_width = track->video.pixel_width;
1611 if (track->video.display_height == -1)
1612 track->video.display_height = track->video.pixel_height;
1613 if (track->video.color_space.size == 4)
1614 fourcc = AV_RL32(track->video.color_space.data);
1615 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1616 if (!track->audio.out_samplerate)
1617 track->audio.out_samplerate = track->audio.samplerate;
1619 if (encodings_list->nb_elem > 1) {
1620 av_log(matroska->ctx, AV_LOG_ERROR,
1621 "Multiple combined encodings not supported");
1622 } else if (encodings_list->nb_elem == 1) {
1623 if (encodings[0].type) {
1624 if (encodings[0].encryption.key_id.size > 0) {
1625 /* Save the encryption key id to be stored later as a
1627 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1628 key_id_base64 = av_malloc(b64_size);
1629 if (key_id_base64 == NULL)
1630 return AVERROR(ENOMEM);
1632 av_base64_encode(key_id_base64, b64_size,
1633 encodings[0].encryption.key_id.data,
1634 encodings[0].encryption.key_id.size);
1636 encodings[0].scope = 0;
1637 av_log(matroska->ctx, AV_LOG_ERROR,
1638 "Unsupported encoding type");
1642 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1645 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1648 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1650 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
1651 encodings[0].scope = 0;
1652 av_log(matroska->ctx, AV_LOG_ERROR,
1653 "Unsupported encoding type");
1654 } else if (track->codec_priv.size && encodings[0].scope & 2) {
1655 uint8_t *codec_priv = track->codec_priv.data;
1656 int ret = matroska_decode_buffer(&track->codec_priv.data,
1657 &track->codec_priv.size,
1660 track->codec_priv.data = NULL;
1661 track->codec_priv.size = 0;
1662 av_log(matroska->ctx, AV_LOG_ERROR,
1663 "Failed to decode codec private data\n");
1666 if (codec_priv != track->codec_priv.data)
1667 av_free(codec_priv);
1671 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1672 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1673 strlen(ff_mkv_codec_tags[j].str))) {
1674 codec_id = ff_mkv_codec_tags[j].id;
1679 st = track->stream = avformat_new_stream(s, NULL);
1681 av_free(key_id_base64);
1682 return AVERROR(ENOMEM);
1685 if (key_id_base64) {
1686 /* export encryption key id as base64 metadata tag */
1687 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1688 av_freep(&key_id_base64);
1691 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1692 track->codec_priv.size >= 40 &&
1693 track->codec_priv.data) {
1694 track->ms_compat = 1;
1695 bit_depth = AV_RL16(track->codec_priv.data + 14);
1696 fourcc = AV_RL32(track->codec_priv.data + 16);
1697 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
1700 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
1702 extradata_offset = 40;
1703 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1704 track->codec_priv.size >= 14 &&
1705 track->codec_priv.data) {
1707 ffio_init_context(&b, track->codec_priv.data,
1708 track->codec_priv.size,
1709 0, NULL, NULL, NULL, NULL);
1710 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1713 codec_id = st->codec->codec_id;
1714 extradata_offset = FFMIN(track->codec_priv.size, 18);
1715 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1716 && (track->codec_priv.size >= 86)
1717 && (track->codec_priv.data)) {
1718 fourcc = AV_RL32(track->codec_priv.data + 4);
1719 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1720 if (ff_codec_get_id(ff_codec_movaudio_tags, AV_RL32(track->codec_priv.data))) {
1721 fourcc = AV_RL32(track->codec_priv.data);
1722 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1724 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1725 (track->codec_priv.size >= 21) &&
1726 (track->codec_priv.data)) {
1727 fourcc = AV_RL32(track->codec_priv.data + 4);
1728 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1729 if (ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(track->codec_priv.data))) {
1730 fourcc = AV_RL32(track->codec_priv.data);
1731 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1733 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1734 codec_id = AV_CODEC_ID_SVQ3;
1735 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1736 switch (track->audio.bitdepth) {
1738 codec_id = AV_CODEC_ID_PCM_U8;
1741 codec_id = AV_CODEC_ID_PCM_S24BE;
1744 codec_id = AV_CODEC_ID_PCM_S32BE;
1747 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1748 switch (track->audio.bitdepth) {
1750 codec_id = AV_CODEC_ID_PCM_U8;
1753 codec_id = AV_CODEC_ID_PCM_S24LE;
1756 codec_id = AV_CODEC_ID_PCM_S32LE;
1759 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1760 track->audio.bitdepth == 64) {
1761 codec_id = AV_CODEC_ID_PCM_F64LE;
1762 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1763 int profile = matroska_aac_profile(track->codec_id);
1764 int sri = matroska_aac_sri(track->audio.samplerate);
1765 extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1767 return AVERROR(ENOMEM);
1768 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1769 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1770 if (strstr(track->codec_id, "SBR")) {
1771 sri = matroska_aac_sri(track->audio.out_samplerate);
1772 extradata[2] = 0x56;
1773 extradata[3] = 0xE5;
1774 extradata[4] = 0x80 | (sri << 3);
1778 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1779 /* Only ALAC's magic cookie is stored in Matroska's track headers.
1780 * Create the "atom size", "tag", and "tag version" fields the
1781 * decoder expects manually. */
1782 extradata_size = 12 + track->codec_priv.size;
1783 extradata = av_mallocz(extradata_size +
1784 FF_INPUT_BUFFER_PADDING_SIZE);
1786 return AVERROR(ENOMEM);
1787 AV_WB32(extradata, extradata_size);
1788 memcpy(&extradata[4], "alac", 4);
1789 AV_WB32(&extradata[8], 0);
1790 memcpy(&extradata[12], track->codec_priv.data,
1791 track->codec_priv.size);
1792 } else if (codec_id == AV_CODEC_ID_TTA) {
1793 extradata_size = 30;
1794 extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1796 return AVERROR(ENOMEM);
1797 ffio_init_context(&b, extradata, extradata_size, 1,
1798 NULL, NULL, NULL, NULL);
1799 avio_write(&b, "TTA1", 4);
1801 avio_wl16(&b, track->audio.channels);
1802 avio_wl16(&b, track->audio.bitdepth);
1803 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1804 return AVERROR_INVALIDDATA;
1805 avio_wl32(&b, track->audio.out_samplerate);
1806 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1807 track->audio.out_samplerate,
1808 AV_TIME_BASE * 1000));
1809 } else if (codec_id == AV_CODEC_ID_RV10 ||
1810 codec_id == AV_CODEC_ID_RV20 ||
1811 codec_id == AV_CODEC_ID_RV30 ||
1812 codec_id == AV_CODEC_ID_RV40) {
1813 extradata_offset = 26;
1814 } else if (codec_id == AV_CODEC_ID_RA_144) {
1815 track->audio.out_samplerate = 8000;
1816 track->audio.channels = 1;
1817 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1818 codec_id == AV_CODEC_ID_COOK ||
1819 codec_id == AV_CODEC_ID_ATRAC3 ||
1820 codec_id == AV_CODEC_ID_SIPR)
1821 && track->codec_priv.data) {
1824 ffio_init_context(&b, track->codec_priv.data,
1825 track->codec_priv.size,
1826 0, NULL, NULL, NULL, NULL);
1828 flavor = avio_rb16(&b);
1829 track->audio.coded_framesize = avio_rb32(&b);
1831 track->audio.sub_packet_h = avio_rb16(&b);
1832 track->audio.frame_size = avio_rb16(&b);
1833 track->audio.sub_packet_size = avio_rb16(&b);
1835 track->audio.coded_framesize <= 0 ||
1836 track->audio.sub_packet_h <= 0 ||
1837 track->audio.frame_size <= 0 ||
1838 track->audio.sub_packet_size <= 0)
1839 return AVERROR_INVALIDDATA;
1840 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1841 track->audio.frame_size);
1842 if (!track->audio.buf)
1843 return AVERROR(ENOMEM);
1844 if (codec_id == AV_CODEC_ID_RA_288) {
1845 st->codec->block_align = track->audio.coded_framesize;
1846 track->codec_priv.size = 0;
1848 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1849 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1850 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1851 st->codec->bit_rate = sipr_bit_rate[flavor];
1853 st->codec->block_align = track->audio.sub_packet_size;
1854 extradata_offset = 78;
1856 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
1857 ret = matroska_parse_flac(s, track, &extradata_offset);
1860 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1861 fourcc = AV_RL32(track->codec_priv.data);
1863 track->codec_priv.size -= extradata_offset;
1865 if (codec_id == AV_CODEC_ID_NONE)
1866 av_log(matroska->ctx, AV_LOG_INFO,
1867 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1869 if (track->time_scale < 0.01)
1870 track->time_scale = 1.0;
1871 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1872 1000 * 1000 * 1000); /* 64 bit pts in ns */
1874 /* convert the delay from ns to the track timebase */
1875 track->codec_delay = av_rescale_q(track->codec_delay,
1876 (AVRational){ 1, 1000000000 },
1879 st->codec->codec_id = codec_id;
1881 if (strcmp(track->language, "und"))
1882 av_dict_set(&st->metadata, "language", track->language, 0);
1883 av_dict_set(&st->metadata, "title", track->name, 0);
1885 if (track->flag_default)
1886 st->disposition |= AV_DISPOSITION_DEFAULT;
1887 if (track->flag_forced)
1888 st->disposition |= AV_DISPOSITION_FORCED;
1890 if (!st->codec->extradata) {
1892 st->codec->extradata = extradata;
1893 st->codec->extradata_size = extradata_size;
1894 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1895 if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1896 return AVERROR(ENOMEM);
1897 memcpy(st->codec->extradata,
1898 track->codec_priv.data + extradata_offset,
1899 track->codec_priv.size);
1903 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1904 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1906 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1907 st->codec->codec_tag = fourcc;
1909 st->codec->bits_per_coded_sample = bit_depth;
1910 st->codec->width = track->video.pixel_width;
1911 st->codec->height = track->video.pixel_height;
1912 av_reduce(&st->sample_aspect_ratio.num,
1913 &st->sample_aspect_ratio.den,
1914 st->codec->height * track->video.display_width,
1915 st->codec->width * track->video.display_height,
1917 if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1918 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1920 if (track->default_duration) {
1921 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1922 1000000000, track->default_duration, 30000);
1923 #if FF_API_R_FRAME_RATE
1924 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L
1925 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5L)
1926 st->r_frame_rate = st->avg_frame_rate;
1930 /* export stereo mode flag as metadata tag */
1931 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1932 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
1934 /* export alpha mode flag as metadata tag */
1935 if (track->video.alpha_mode)
1936 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
1938 /* if we have virtual track, mark the real tracks */
1939 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
1941 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
1943 snprintf(buf, sizeof(buf), "%s_%d",
1944 ff_matroska_video_stereo_plane[planes[j].type], i);
1945 for (k=0; k < matroska->tracks.nb_elem; k++)
1946 if (planes[j].uid == tracks[k].uid) {
1947 av_dict_set(&s->streams[k]->metadata,
1948 "stereo_mode", buf, 0);
1952 // add stream level stereo3d side data if it is a supported format
1953 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1954 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
1955 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
1959 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1960 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1961 st->codec->sample_rate = track->audio.out_samplerate;
1962 st->codec->channels = track->audio.channels;
1963 if (!st->codec->bits_per_coded_sample)
1964 st->codec->bits_per_coded_sample = track->audio.bitdepth;
1965 if (st->codec->codec_id != AV_CODEC_ID_AAC)
1966 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1967 if (track->codec_delay > 0) {
1968 st->codec->delay = av_rescale_q(track->codec_delay,
1970 (AVRational){1, st->codec->sample_rate});
1972 if (track->seek_preroll > 0) {
1973 av_codec_set_seek_preroll(st->codec,
1974 av_rescale_q(track->seek_preroll,
1975 (AVRational){1, 1000000000},
1976 (AVRational){1, st->codec->sample_rate}));
1978 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
1979 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1981 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
1982 st->disposition |= AV_DISPOSITION_CAPTIONS;
1983 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
1984 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1985 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
1986 st->disposition |= AV_DISPOSITION_METADATA;
1988 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1989 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1990 if (st->codec->codec_id == AV_CODEC_ID_ASS)
1991 matroska->contains_ssa = 1;
1998 static int matroska_read_header(AVFormatContext *s)
2000 MatroskaDemuxContext *matroska = s->priv_data;
2001 EbmlList *attachments_list = &matroska->attachments;
2002 EbmlList *chapters_list = &matroska->chapters;
2003 MatroskaAttachment *attachments;
2004 MatroskaChapter *chapters;
2005 uint64_t max_start = 0;
2012 /* First read the EBML header. */
2013 if (ebml_parse(matroska, ebml_syntax, &ebml) ||
2014 ebml.version > EBML_VERSION ||
2015 ebml.max_size > sizeof(uint64_t) ||
2016 ebml.id_length > sizeof(uint32_t) ||
2017 ebml.doctype_version > 3 ||
2019 av_log(matroska->ctx, AV_LOG_ERROR,
2020 "EBML header using unsupported features\n"
2021 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2022 ebml.version, ebml.doctype, ebml.doctype_version);
2023 ebml_free(ebml_syntax, &ebml);
2024 return AVERROR_PATCHWELCOME;
2025 } else if (ebml.doctype_version == 3) {
2026 av_log(matroska->ctx, AV_LOG_WARNING,
2027 "EBML header using unsupported features\n"
2028 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2029 ebml.version, ebml.doctype, ebml.doctype_version);
2031 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2032 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2034 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2035 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2036 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2037 ebml_free(ebml_syntax, &ebml);
2038 return AVERROR_INVALIDDATA;
2041 ebml_free(ebml_syntax, &ebml);
2043 /* The next thing is a segment. */
2044 pos = avio_tell(matroska->ctx->pb);
2045 res = ebml_parse(matroska, matroska_segments, matroska);
2046 // try resyncing until we find a EBML_STOP type element.
2048 res = matroska_resync(matroska, pos);
2051 pos = avio_tell(matroska->ctx->pb);
2052 res = ebml_parse(matroska, matroska_segment, matroska);
2054 matroska_execute_seekhead(matroska);
2056 if (!matroska->time_scale)
2057 matroska->time_scale = 1000000;
2058 if (matroska->duration)
2059 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2060 1000 / AV_TIME_BASE;
2061 av_dict_set(&s->metadata, "title", matroska->title, 0);
2062 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2064 if (matroska->date_utc.size == 8)
2065 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2067 res = matroska_parse_tracks(s);
2071 attachments = attachments_list->elem;
2072 for (j = 0; j < attachments_list->nb_elem; j++) {
2073 if (!(attachments[j].filename && attachments[j].mime &&
2074 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2075 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2077 AVStream *st = avformat_new_stream(s, NULL);
2080 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2081 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2082 st->codec->codec_id = AV_CODEC_ID_NONE;
2083 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2084 if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2086 memcpy(st->codec->extradata, attachments[j].bin.data,
2087 attachments[j].bin.size);
2089 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2090 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2091 strlen(ff_mkv_mime_tags[i].str))) {
2092 st->codec->codec_id = ff_mkv_mime_tags[i].id;
2096 attachments[j].stream = st;
2100 chapters = chapters_list->elem;
2101 for (i = 0; i < chapters_list->nb_elem; i++)
2102 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2103 (max_start == 0 || chapters[i].start > max_start)) {
2104 chapters[i].chapter =
2105 avpriv_new_chapter(s, chapters[i].uid,
2106 (AVRational) { 1, 1000000000 },
2107 chapters[i].start, chapters[i].end,
2109 if (chapters[i].chapter) {
2110 av_dict_set(&chapters[i].chapter->metadata,
2111 "title", chapters[i].title, 0);
2113 max_start = chapters[i].start;
2116 matroska_add_index_entries(matroska);
2118 matroska_convert_tags(s);
2124 * Put one packet in an application-supplied AVPacket struct.
2125 * Returns 0 on success or -1 on failure.
2127 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2130 if (matroska->num_packets > 0) {
2131 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2132 av_free(matroska->packets[0]);
2133 if (matroska->num_packets > 1) {
2135 memmove(&matroska->packets[0], &matroska->packets[1],
2136 (matroska->num_packets - 1) * sizeof(AVPacket *));
2137 newpackets = av_realloc(matroska->packets,
2138 (matroska->num_packets - 1) *
2139 sizeof(AVPacket *));
2141 matroska->packets = newpackets;
2143 av_freep(&matroska->packets);
2144 matroska->prev_pkt = NULL;
2146 matroska->num_packets--;
2154 * Free all packets in our internal queue.
2156 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2158 matroska->prev_pkt = NULL;
2159 if (matroska->packets) {
2161 for (n = 0; n < matroska->num_packets; n++) {
2162 av_free_packet(matroska->packets[n]);
2163 av_free(matroska->packets[n]);
2165 av_freep(&matroska->packets);
2166 matroska->num_packets = 0;
2170 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2171 int *buf_size, int type,
2172 uint32_t **lace_buf, int *laces)
2174 int res = 0, n, size = *buf_size;
2175 uint8_t *data = *buf;
2176 uint32_t *lace_size;
2180 *lace_buf = av_mallocz(sizeof(int));
2182 return AVERROR(ENOMEM);
2184 *lace_buf[0] = size;
2188 av_assert0(size > 0);
2192 lace_size = av_mallocz(*laces * sizeof(int));
2194 return AVERROR(ENOMEM);
2197 case 0x1: /* Xiph lacing */
2201 for (n = 0; res == 0 && n < *laces - 1; n++) {
2203 if (size <= total) {
2204 res = AVERROR_INVALIDDATA;
2209 lace_size[n] += temp;
2216 if (size <= total) {
2217 res = AVERROR_INVALIDDATA;
2221 lace_size[n] = size - total;
2225 case 0x2: /* fixed-size lacing */
2226 if (size % (*laces)) {
2227 res = AVERROR_INVALIDDATA;
2230 for (n = 0; n < *laces; n++)
2231 lace_size[n] = size / *laces;
2234 case 0x3: /* EBML lacing */
2238 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2239 if (n < 0 || num > INT_MAX) {
2240 av_log(matroska->ctx, AV_LOG_INFO,
2241 "EBML block data error\n");
2242 res = n<0 ? n : AVERROR_INVALIDDATA;
2247 total = lace_size[0] = num;
2248 for (n = 1; res == 0 && n < *laces - 1; n++) {
2251 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2252 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2253 av_log(matroska->ctx, AV_LOG_INFO,
2254 "EBML block data error\n");
2255 res = r<0 ? r : AVERROR_INVALIDDATA;
2260 lace_size[n] = lace_size[n - 1] + snum;
2261 total += lace_size[n];
2263 if (size <= total) {
2264 res = AVERROR_INVALIDDATA;
2267 lace_size[*laces - 1] = size - total;
2273 *lace_buf = lace_size;
2279 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2280 MatroskaTrack *track, AVStream *st,
2281 uint8_t *data, int size, uint64_t timecode,
2284 int a = st->codec->block_align;
2285 int sps = track->audio.sub_packet_size;
2286 int cfs = track->audio.coded_framesize;
2287 int h = track->audio.sub_packet_h;
2288 int y = track->audio.sub_packet_cnt;
2289 int w = track->audio.frame_size;
2292 if (!track->audio.pkt_cnt) {
2293 if (track->audio.sub_packet_cnt == 0)
2294 track->audio.buf_timecode = timecode;
2295 if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2296 if (size < cfs * h / 2) {
2297 av_log(matroska->ctx, AV_LOG_ERROR,
2298 "Corrupt int4 RM-style audio packet size\n");
2299 return AVERROR_INVALIDDATA;
2301 for (x = 0; x < h / 2; x++)
2302 memcpy(track->audio.buf + x * 2 * w + y * cfs,
2303 data + x * cfs, cfs);
2304 } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2306 av_log(matroska->ctx, AV_LOG_ERROR,
2307 "Corrupt sipr RM-style audio packet size\n");
2308 return AVERROR_INVALIDDATA;
2310 memcpy(track->audio.buf + y * w, data, w);
2312 if (size < sps * w / sps || h<=0 || w%sps) {
2313 av_log(matroska->ctx, AV_LOG_ERROR,
2314 "Corrupt generic RM-style audio packet size\n");
2315 return AVERROR_INVALIDDATA;
2317 for (x = 0; x < w / sps; x++)
2318 memcpy(track->audio.buf +
2319 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2320 data + x * sps, sps);
2323 if (++track->audio.sub_packet_cnt >= h) {
2324 if (st->codec->codec_id == AV_CODEC_ID_SIPR)
2325 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2326 track->audio.sub_packet_cnt = 0;
2327 track->audio.pkt_cnt = h * w / a;
2331 while (track->audio.pkt_cnt) {
2333 AVPacket *pkt = av_mallocz(sizeof(AVPacket));
2335 return AVERROR(ENOMEM);
2337 ret = av_new_packet(pkt, a);
2343 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2345 pkt->pts = track->audio.buf_timecode;
2346 track->audio.buf_timecode = AV_NOPTS_VALUE;
2348 pkt->stream_index = st->index;
2349 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2355 /* reconstruct full wavpack blocks from mangled matroska ones */
2356 static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
2357 uint8_t **pdst, int *size)
2359 uint8_t *dst = NULL;
2364 int ret, offset = 0;
2366 if (srclen < 12 || track->stream->codec->extradata_size < 2)
2367 return AVERROR_INVALIDDATA;
2369 ver = AV_RL16(track->stream->codec->extradata);
2371 samples = AV_RL32(src);
2375 while (srclen >= 8) {
2380 uint32_t flags = AV_RL32(src);
2381 uint32_t crc = AV_RL32(src + 4);
2385 multiblock = (flags & 0x1800) != 0x1800;
2388 ret = AVERROR_INVALIDDATA;
2391 blocksize = AV_RL32(src);
2397 if (blocksize > srclen) {
2398 ret = AVERROR_INVALIDDATA;
2402 tmp = av_realloc(dst, dstlen + blocksize + 32);
2404 ret = AVERROR(ENOMEM);
2408 dstlen += blocksize + 32;
2410 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2411 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2412 AV_WL16(dst + offset + 8, ver); // version
2413 AV_WL16(dst + offset + 10, 0); // track/index_no
2414 AV_WL32(dst + offset + 12, 0); // total samples
2415 AV_WL32(dst + offset + 16, 0); // block index
2416 AV_WL32(dst + offset + 20, samples); // number of samples
2417 AV_WL32(dst + offset + 24, flags); // flags
2418 AV_WL32(dst + offset + 28, crc); // crc
2419 memcpy(dst + offset + 32, src, blocksize); // block data
2422 srclen -= blocksize;
2423 offset += blocksize + 32;
2436 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
2437 MatroskaTrack *track,
2439 uint8_t *data, int data_len,
2445 uint8_t *id, *settings, *text, *buf;
2446 int id_len, settings_len, text_len;
2451 return AVERROR_INVALIDDATA;
2454 q = data + data_len;
2459 if (*p == '\r' || *p == '\n') {
2468 if (p >= q || *p != '\n')
2469 return AVERROR_INVALIDDATA;
2475 if (*p == '\r' || *p == '\n') {
2476 settings_len = p - settings;
2484 if (p >= q || *p != '\n')
2485 return AVERROR_INVALIDDATA;
2490 while (text_len > 0) {
2491 const int len = text_len - 1;
2492 const uint8_t c = p[len];
2493 if (c != '\r' && c != '\n')
2499 return AVERROR_INVALIDDATA;
2501 pkt = av_mallocz(sizeof(*pkt));
2502 err = av_new_packet(pkt, text_len);
2505 return AVERROR(err);
2508 memcpy(pkt->data, text, text_len);
2511 buf = av_packet_new_side_data(pkt,
2512 AV_PKT_DATA_WEBVTT_IDENTIFIER,
2516 return AVERROR(ENOMEM);
2518 memcpy(buf, id, id_len);
2521 if (settings_len > 0) {
2522 buf = av_packet_new_side_data(pkt,
2523 AV_PKT_DATA_WEBVTT_SETTINGS,
2527 return AVERROR(ENOMEM);
2529 memcpy(buf, settings, settings_len);
2532 // Do we need this for subtitles?
2533 // pkt->flags = AV_PKT_FLAG_KEY;
2535 pkt->stream_index = st->index;
2536 pkt->pts = timecode;
2538 // Do we need this for subtitles?
2539 // pkt->dts = timecode;
2541 pkt->duration = duration;
2544 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2545 matroska->prev_pkt = pkt;
2550 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2551 MatroskaTrack *track, AVStream *st,
2552 uint8_t *data, int pkt_size,
2553 uint64_t timecode, uint64_t lace_duration,
2554 int64_t pos, int is_keyframe,
2555 uint8_t *additional, uint64_t additional_id, int additional_size,
2556 int64_t discard_padding)
2558 MatroskaTrackEncoding *encodings = track->encodings.elem;
2559 uint8_t *pkt_data = data;
2560 int offset = 0, res;
2563 if (encodings && !encodings->type && encodings->scope & 1) {
2564 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2569 if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2571 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2573 av_log(matroska->ctx, AV_LOG_ERROR,
2574 "Error parsing a wavpack block.\n");
2577 if (pkt_data != data)
2578 av_freep(&pkt_data);
2582 if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2583 AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2586 pkt = av_mallocz(sizeof(AVPacket));
2587 /* XXX: prevent data copy... */
2588 if (av_new_packet(pkt, pkt_size + offset) < 0) {
2590 res = AVERROR(ENOMEM);
2594 if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2595 uint8_t *buf = pkt->data;
2596 bytestream_put_be32(&buf, pkt_size);
2597 bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2600 memcpy(pkt->data + offset, pkt_data, pkt_size);
2602 if (pkt_data != data)
2603 av_freep(&pkt_data);
2605 pkt->flags = is_keyframe;
2606 pkt->stream_index = st->index;
2608 if (additional_size > 0) {
2609 uint8_t *side_data = av_packet_new_side_data(pkt,
2610 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2611 additional_size + 8);
2613 av_free_packet(pkt);
2615 return AVERROR(ENOMEM);
2617 AV_WB64(side_data, additional_id);
2618 memcpy(side_data + 8, additional, additional_size);
2621 if (discard_padding) {
2622 uint8_t *side_data = av_packet_new_side_data(pkt,
2623 AV_PKT_DATA_SKIP_SAMPLES,
2626 av_free_packet(pkt);
2628 return AVERROR(ENOMEM);
2630 AV_WL32(side_data, 0);
2631 AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2632 (AVRational){1, 1000000000},
2633 (AVRational){1, st->codec->sample_rate}));
2636 if (track->ms_compat)
2637 pkt->dts = timecode;
2639 pkt->pts = timecode;
2641 if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2643 * For backward compatibility.
2644 * Historically, we have put subtitle duration
2645 * in convergence_duration, on the off chance
2646 * that the time_scale is less than 1us, which
2647 * could result in a 32bit overflow on the
2648 * normal duration field.
2650 pkt->convergence_duration = lace_duration;
2653 if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2654 lace_duration <= INT_MAX) {
2656 * For non subtitle tracks, just store the duration
2659 * If it's a subtitle track and duration value does
2660 * not overflow a uint32, then also store it normally.
2662 pkt->duration = lace_duration;
2665 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2666 matroska->prev_pkt = pkt;
2671 if (pkt_data != data)
2672 av_freep(&pkt_data);
2676 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2677 int size, int64_t pos, uint64_t cluster_time,
2678 uint64_t block_duration, int is_keyframe,
2679 uint8_t *additional, uint64_t additional_id, int additional_size,
2680 int64_t cluster_pos, int64_t discard_padding)
2682 uint64_t timecode = AV_NOPTS_VALUE;
2683 MatroskaTrack *track;
2687 uint32_t *lace_size = NULL;
2688 int n, flags, laces = 0;
2690 int trust_default_duration = 1;
2692 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2693 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2699 track = matroska_find_track_by_num(matroska, num);
2700 if (!track || !track->stream) {
2701 av_log(matroska->ctx, AV_LOG_INFO,
2702 "Invalid stream %"PRIu64" or size %u\n", num, size);
2703 return AVERROR_INVALIDDATA;
2704 } else if (size <= 3)
2707 if (st->discard >= AVDISCARD_ALL)
2709 av_assert1(block_duration != AV_NOPTS_VALUE);
2711 block_time = sign_extend(AV_RB16(data), 16);
2715 if (is_keyframe == -1)
2716 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2718 if (cluster_time != (uint64_t) -1 &&
2719 (block_time >= 0 || cluster_time >= -block_time)) {
2720 timecode = cluster_time + block_time - track->codec_delay;
2721 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2722 timecode < track->end_timecode)
2723 is_keyframe = 0; /* overlapping subtitles are not key frame */
2725 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2729 if (matroska->skip_to_keyframe &&
2730 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2731 if (timecode < matroska->skip_to_timecode)
2734 matroska->skip_to_keyframe = 0;
2735 else if (!st->skip_to_keyframe) {
2736 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2737 matroska->skip_to_keyframe = 0;
2741 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2742 &lace_size, &laces);
2747 if (track->audio.samplerate == 8000) {
2748 // If this is needed for more codecs, then add them here
2749 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2750 if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2751 trust_default_duration = 0;
2755 if (!block_duration && trust_default_duration)
2756 block_duration = track->default_duration * laces / matroska->time_scale;
2758 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2759 track->end_timecode =
2760 FFMAX(track->end_timecode, timecode + block_duration);
2762 for (n = 0; n < laces; n++) {
2763 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2765 if (lace_size[n] > size) {
2766 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2770 if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2771 st->codec->codec_id == AV_CODEC_ID_COOK ||
2772 st->codec->codec_id == AV_CODEC_ID_SIPR ||
2773 st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2774 st->codec->block_align && track->audio.sub_packet_size) {
2775 res = matroska_parse_rm_audio(matroska, track, st, data,
2781 } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2782 res = matroska_parse_webvtt(matroska, track, st,
2784 timecode, lace_duration,
2789 res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2790 timecode, lace_duration, pos,
2791 !n ? is_keyframe : 0,
2792 additional, additional_id, additional_size,
2798 if (timecode != AV_NOPTS_VALUE)
2799 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2800 data += lace_size[n];
2801 size -= lace_size[n];
2809 static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2811 EbmlList *blocks_list;
2812 MatroskaBlock *blocks;
2814 res = ebml_parse(matroska,
2815 matroska_cluster_incremental_parsing,
2816 &matroska->current_cluster);
2819 if (matroska->current_cluster_pos)
2820 ebml_level_end(matroska);
2821 ebml_free(matroska_cluster, &matroska->current_cluster);
2822 memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2823 matroska->current_cluster_num_blocks = 0;
2824 matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2825 matroska->prev_pkt = NULL;
2826 /* sizeof the ID which was already read */
2827 if (matroska->current_id)
2828 matroska->current_cluster_pos -= 4;
2829 res = ebml_parse(matroska,
2830 matroska_clusters_incremental,
2831 &matroska->current_cluster);
2832 /* Try parsing the block again. */
2834 res = ebml_parse(matroska,
2835 matroska_cluster_incremental_parsing,
2836 &matroska->current_cluster);
2840 matroska->current_cluster_num_blocks <
2841 matroska->current_cluster.blocks.nb_elem) {
2842 blocks_list = &matroska->current_cluster.blocks;
2843 blocks = blocks_list->elem;
2845 matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2846 i = blocks_list->nb_elem - 1;
2847 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2848 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2849 uint8_t* additional = blocks[i].additional.size > 0 ?
2850 blocks[i].additional.data : NULL;
2851 if (!blocks[i].non_simple)
2852 blocks[i].duration = 0;
2853 res = matroska_parse_block(matroska, blocks[i].bin.data,
2854 blocks[i].bin.size, blocks[i].bin.pos,
2855 matroska->current_cluster.timecode,
2856 blocks[i].duration, is_keyframe,
2857 additional, blocks[i].additional_id,
2858 blocks[i].additional.size,
2859 matroska->current_cluster_pos,
2860 blocks[i].discard_padding);
2867 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2869 MatroskaCluster cluster = { 0 };
2870 EbmlList *blocks_list;
2871 MatroskaBlock *blocks;
2875 if (!matroska->contains_ssa)
2876 return matroska_parse_cluster_incremental(matroska);
2877 pos = avio_tell(matroska->ctx->pb);
2878 matroska->prev_pkt = NULL;
2879 if (matroska->current_id)
2880 pos -= 4; /* sizeof the ID which was already read */
2881 res = ebml_parse(matroska, matroska_clusters, &cluster);
2882 blocks_list = &cluster.blocks;
2883 blocks = blocks_list->elem;
2884 for (i = 0; i < blocks_list->nb_elem; i++)
2885 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2886 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2887 res = matroska_parse_block(matroska, blocks[i].bin.data,
2888 blocks[i].bin.size, blocks[i].bin.pos,
2889 cluster.timecode, blocks[i].duration,
2890 is_keyframe, NULL, 0, 0, pos,
2891 blocks[i].discard_padding);
2893 ebml_free(matroska_cluster, &cluster);
2897 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2899 MatroskaDemuxContext *matroska = s->priv_data;
2901 while (matroska_deliver_packet(matroska, pkt)) {
2902 int64_t pos = avio_tell(matroska->ctx->pb);
2905 if (matroska_parse_cluster(matroska) < 0)
2906 matroska_resync(matroska, pos);
2912 static int matroska_read_seek(AVFormatContext *s, int stream_index,
2913 int64_t timestamp, int flags)
2915 MatroskaDemuxContext *matroska = s->priv_data;
2916 MatroskaTrack *tracks = NULL;
2917 AVStream *st = s->streams[stream_index];
2918 int i, index, index_sub, index_min;
2920 /* Parse the CUES now since we need the index data to seek. */
2921 if (matroska->cues_parsing_deferred > 0) {
2922 matroska->cues_parsing_deferred = 0;
2923 matroska_parse_cues(matroska);
2926 if (!st->nb_index_entries)
2928 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
2930 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
2931 avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
2933 matroska->current_id = 0;
2934 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
2935 matroska_clear_queue(matroska);
2936 if (matroska_parse_cluster(matroska) < 0)
2941 matroska_clear_queue(matroska);
2942 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
2946 tracks = matroska->tracks.elem;
2947 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2948 tracks[i].audio.pkt_cnt = 0;
2949 tracks[i].audio.sub_packet_cnt = 0;
2950 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2951 tracks[i].end_timecode = 0;
2952 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2953 tracks[i].stream->discard != AVDISCARD_ALL) {
2954 index_sub = av_index_search_timestamp(
2955 tracks[i].stream, st->index_entries[index].timestamp,
2956 AVSEEK_FLAG_BACKWARD);
2957 while (index_sub >= 0 &&
2959 tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
2960 st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
2965 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2966 matroska->current_id = 0;
2967 if (flags & AVSEEK_FLAG_ANY) {
2968 st->skip_to_keyframe = 0;
2969 matroska->skip_to_timecode = timestamp;
2971 st->skip_to_keyframe = 1;
2972 matroska->skip_to_timecode = st->index_entries[index].timestamp;
2974 matroska->skip_to_keyframe = 1;
2976 matroska->num_levels = 0;
2977 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2980 // slightly hackish but allows proper fallback to
2981 // the generic seeking code.
2982 matroska_clear_queue(matroska);
2983 matroska->current_id = 0;
2984 st->skip_to_keyframe =
2985 matroska->skip_to_keyframe = 0;
2987 matroska->num_levels = 0;
2991 static int matroska_read_close(AVFormatContext *s)
2993 MatroskaDemuxContext *matroska = s->priv_data;
2994 MatroskaTrack *tracks = matroska->tracks.elem;
2997 matroska_clear_queue(matroska);
2999 for (n = 0; n < matroska->tracks.nb_elem; n++)
3000 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3001 av_free(tracks[n].audio.buf);
3002 ebml_free(matroska_cluster, &matroska->current_cluster);
3003 ebml_free(matroska_segment, matroska);
3009 int64_t start_time_ns;
3010 int64_t end_time_ns;
3011 int64_t start_offset;
3015 /* This function searches all the Cues and returns the CueDesc corresponding the
3016 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3017 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3019 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3020 MatroskaDemuxContext *matroska = s->priv_data;
3023 int nb_index_entries = s->streams[0]->nb_index_entries;
3024 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3025 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3026 for (i = 1; i < nb_index_entries; i++) {
3027 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3028 index_entries[i].timestamp * matroska->time_scale > ts) {
3033 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3034 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3035 if (i != nb_index_entries - 1) {
3036 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3037 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3039 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3040 // FIXME: this needs special handling for files where Cues appear
3041 // before Clusters. the current logic assumes Cues appear after
3043 cue_desc.end_offset = cues_start - matroska->segment_start;
3048 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3050 MatroskaDemuxContext *matroska = s->priv_data;
3051 int64_t cluster_pos, before_pos;
3053 if (s->streams[0]->nb_index_entries <= 0) return 0;
3054 // seek to the first cluster using cues.
3055 index = av_index_search_timestamp(s->streams[0], 0, 0);
3056 if (index < 0) return 0;
3057 cluster_pos = s->streams[0]->index_entries[index].pos;
3058 before_pos = avio_tell(s->pb);
3060 int64_t cluster_id = 0, cluster_length = 0;
3062 avio_seek(s->pb, cluster_pos, SEEK_SET);
3063 // read cluster id and length
3064 ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
3065 ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3066 if (cluster_id != 0xF43B675) { // done with all clusters
3069 avio_seek(s->pb, cluster_pos, SEEK_SET);
3070 matroska->current_id = 0;
3071 matroska_clear_queue(matroska);
3072 if (matroska_parse_cluster(matroska) < 0 ||
3073 matroska->num_packets <= 0) {
3076 pkt = matroska->packets[0];
3077 cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
3078 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3083 avio_seek(s->pb, before_pos, SEEK_SET);
3087 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3088 double min_buffer, double* buffer,
3089 double* sec_to_download, AVFormatContext *s,
3092 double nano_seconds_per_second = 1000000000.0;
3093 double time_sec = time_ns / nano_seconds_per_second;
3095 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3096 int64_t end_time_ns = time_ns + time_to_search_ns;
3097 double sec_downloaded = 0.0;
3098 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3099 if (desc_curr.start_time_ns == -1)
3101 *sec_to_download = 0.0;
3103 // Check for non cue start time.
3104 if (time_ns > desc_curr.start_time_ns) {
3105 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3106 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3107 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3108 double timeToDownload = (cueBytes * 8.0) / bps;
3110 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3111 *sec_to_download += timeToDownload;
3113 // Check if the search ends within the first cue.
3114 if (desc_curr.end_time_ns >= end_time_ns) {
3115 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3116 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3117 sec_downloaded = percent_to_sub * sec_downloaded;
3118 *sec_to_download = percent_to_sub * *sec_to_download;
3121 if ((sec_downloaded + *buffer) <= min_buffer) {
3125 // Get the next Cue.
3126 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3129 while (desc_curr.start_time_ns != -1) {
3130 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3131 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3132 double desc_sec = desc_ns / nano_seconds_per_second;
3133 double bits = (desc_bytes * 8.0);
3134 double time_to_download = bits / bps;
3136 sec_downloaded += desc_sec - time_to_download;
3137 *sec_to_download += time_to_download;
3139 if (desc_curr.end_time_ns >= end_time_ns) {
3140 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3141 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3142 sec_downloaded = percent_to_sub * sec_downloaded;
3143 *sec_to_download = percent_to_sub * *sec_to_download;
3145 if ((sec_downloaded + *buffer) <= min_buffer)
3150 if ((sec_downloaded + *buffer) <= min_buffer) {
3155 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3157 *buffer = *buffer + sec_downloaded;
3161 /* This function computes the bandwidth of the WebM file with the help of
3162 * buffer_size_after_time_downloaded() function. Both of these functions are
3163 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3164 * Matroska parsing mechanism.
3166 * Returns the bandwidth of the file on success; -1 on error.
3168 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3170 MatroskaDemuxContext *matroska = s->priv_data;
3171 AVStream *st = s->streams[0];
3172 double bandwidth = 0.0;
3175 for (i = 0; i < st->nb_index_entries; i++) {
3176 int64_t prebuffer_ns = 1000000000;
3177 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3178 double nano_seconds_per_second = 1000000000.0;
3179 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3180 double prebuffer_bytes = 0.0;
3181 int64_t temp_prebuffer_ns = prebuffer_ns;
3182 int64_t pre_bytes, pre_ns;
3183 double pre_sec, prebuffer, bits_per_second;
3184 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3186 // Start with the first Cue.
3187 CueDesc desc_end = desc_beg;
3189 // Figure out how much data we have downloaded for the prebuffer. This will
3190 // be used later to adjust the bits per sample to try.
3191 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3192 // Prebuffered the entire Cue.
3193 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3194 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3195 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3197 if (desc_end.start_time_ns == -1) {
3198 // The prebuffer is larger than the duration.
3199 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3201 bits_per_second = 0.0;
3203 // The prebuffer ends in the last Cue. Estimate how much data was
3205 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3206 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3207 pre_sec = pre_ns / nano_seconds_per_second;
3209 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3211 prebuffer = prebuffer_ns / nano_seconds_per_second;
3213 // Set this to 0.0 in case our prebuffer buffers the entire video.
3214 bits_per_second = 0.0;
3216 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3217 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3218 double desc_sec = desc_ns / nano_seconds_per_second;
3219 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3221 // Drop the bps by the percentage of bytes buffered.
3222 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3223 double mod_bits_per_second = calc_bits_per_second * percent;
3225 if (prebuffer < desc_sec) {
3227 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3229 // Add 1 so the bits per second should be a little bit greater than file
3231 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3232 const double min_buffer = 0.0;
3233 double buffer = prebuffer;
3234 double sec_to_download = 0.0;
3236 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3237 min_buffer, &buffer, &sec_to_download,
3241 } else if (rv == 0) {
3242 bits_per_second = (double)(bps);
3247 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3248 } while (desc_end.start_time_ns != -1);
3250 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3252 return (int64_t)bandwidth;
3255 static int webm_dash_manifest_cues(AVFormatContext *s)
3257 MatroskaDemuxContext *matroska = s->priv_data;
3258 EbmlList *seekhead_list = &matroska->seekhead;
3259 MatroskaSeekhead *seekhead = seekhead_list->elem;
3261 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3264 // determine cues start and end positions
3265 for (i = 0; i < seekhead_list->nb_elem; i++)
3266 if (seekhead[i].id == MATROSKA_ID_CUES)
3269 if (i >= seekhead_list->nb_elem) return -1;
3271 before_pos = avio_tell(matroska->ctx->pb);
3272 cues_start = seekhead[i].pos + matroska->segment_start;
3273 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
3274 // cues_end is computed as cues_start + cues_length + length of the
3275 // Cues element ID + EBML length of the Cues element. cues_end is
3276 // inclusive and the above sum is reduced by 1.
3277 uint64_t cues_length = 0, cues_id = 0, bytes_read = 0;
3278 bytes_read += ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
3279 bytes_read += ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
3280 cues_end = cues_start + cues_length + bytes_read - 1;
3282 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3283 if (cues_start == -1 || cues_end == -1) return -1;
3286 matroska_parse_cues(matroska);
3289 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
3292 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
3295 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
3296 if (bandwidth < 0) return -1;
3297 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
3299 // check if all clusters start with key frames
3300 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
3302 // store cue point timestamps as a comma separated list for checking subsegment alignment in
3303 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3304 buf = av_malloc(s->streams[0]->nb_index_entries * 20 * sizeof(char));
3305 if (!buf) return -1;
3307 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
3308 snprintf(buf, (i + 1) * 20 * sizeof(char),
3309 "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
3310 if (i != s->streams[0]->nb_index_entries - 1)
3311 strncat(buf, ",", sizeof(char));
3313 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
3319 static int webm_dash_manifest_read_header(AVFormatContext *s)
3322 int ret = matroska_read_header(s);
3323 MatroskaTrack *tracks;
3324 MatroskaDemuxContext *matroska = s->priv_data;
3326 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
3330 // initialization range
3331 // 5 is the offset of Cluster ID.
3332 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, avio_tell(s->pb) - 5, 0);
3334 // basename of the file
3335 buf = strrchr(s->filename, '/');
3336 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->filename, 0);
3339 buf = av_asprintf("%g", matroska->duration);
3340 if (!buf) return AVERROR(ENOMEM);
3341 av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
3345 tracks = matroska->tracks.elem;
3346 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
3348 // parse the cues and populate Cue related fields
3349 return webm_dash_manifest_cues(s);
3352 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
3357 AVInputFormat ff_matroska_demuxer = {
3358 .name = "matroska,webm",
3359 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3360 .extensions = "mkv,mk3d,mka,mks",
3361 .priv_data_size = sizeof(MatroskaDemuxContext),
3362 .read_probe = matroska_probe,
3363 .read_header = matroska_read_header,
3364 .read_packet = matroska_read_packet,
3365 .read_close = matroska_read_close,
3366 .read_seek = matroska_read_seek,
3367 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3370 AVInputFormat ff_webm_dash_manifest_demuxer = {
3371 .name = "webm_dash_manifest",
3372 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
3373 .priv_data_size = sizeof(MatroskaDemuxContext),
3374 .read_header = webm_dash_manifest_read_header,
3375 .read_packet = webm_dash_manifest_read_packet,
3376 .read_close = matroska_read_close,