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matroskadec.c
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1 /*
2  * Matroska file demuxer
3  * Copyright (c) 2003-2008 The FFmpeg Project
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 /**
23  * @file
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/
29  */
30 
31 #include "config.h"
32 
33 #include <inttypes.h>
34 #include <stdio.h>
35 
36 #include "libavutil/avstring.h"
37 #include "libavutil/base64.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lzo.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/opt.h"
45 
46 #include "libavcodec/bytestream.h"
47 #include "libavcodec/flac.h"
48 #include "libavcodec/mpeg4audio.h"
49 
50 #include "avformat.h"
51 #include "avio_internal.h"
52 #include "internal.h"
53 #include "isom.h"
54 #include "matroska.h"
55 #include "oggdec.h"
56 /* For ff_codec_get_id(). */
57 #include "riff.h"
58 #include "rmsipr.h"
59 
60 #if CONFIG_BZLIB
61 #include <bzlib.h>
62 #endif
63 #if CONFIG_ZLIB
64 #include <zlib.h>
65 #endif
66 
67 typedef enum {
80 } EbmlType;
81 
82 typedef const struct EbmlSyntax {
83  uint32_t id;
87  union {
88  uint64_t u;
89  double f;
90  const char *s;
91  const struct EbmlSyntax *n;
92  } def;
93 } EbmlSyntax;
94 
95 typedef struct EbmlList {
96  int nb_elem;
97  void *elem;
98 } EbmlList;
99 
100 typedef struct EbmlBin {
101  int size;
103  int64_t pos;
104 } EbmlBin;
105 
106 typedef struct Ebml {
107  uint64_t version;
108  uint64_t max_size;
109  uint64_t id_length;
110  char *doctype;
111  uint64_t doctype_version;
112 } Ebml;
113 
114 typedef struct MatroskaTrackCompression {
115  uint64_t algo;
118 
119 typedef struct MatroskaTrackEncryption {
120  uint64_t algo;
123 
124 typedef struct MatroskaTrackEncoding {
125  uint64_t scope;
126  uint64_t type;
130 
131 typedef struct MatroskaTrackVideo {
132  double frame_rate;
133  uint64_t display_width;
134  uint64_t display_height;
135  uint64_t pixel_width;
136  uint64_t pixel_height;
138  uint64_t stereo_mode;
139  uint64_t alpha_mode;
141 
142 typedef struct MatroskaTrackAudio {
143  double samplerate;
145  uint64_t bitdepth;
146  uint64_t channels;
147 
148  /* real audio header (extracted from extradata) */
154  int pkt_cnt;
155  uint64_t buf_timecode;
158 
159 typedef struct MatroskaTrackPlane {
160  uint64_t uid;
161  uint64_t type;
163 
164 typedef struct MatroskaTrackOperation {
167 
168 typedef struct MatroskaTrack {
169  uint64_t num;
170  uint64_t uid;
171  uint64_t type;
172  char *name;
173  char *codec_id;
175  char *language;
176  double time_scale;
178  uint64_t flag_default;
179  uint64_t flag_forced;
180  uint64_t seek_preroll;
185  uint64_t codec_delay;
186 
188  int64_t end_timecode;
191 } MatroskaTrack;
192 
193 typedef struct MatroskaAttachment {
194  uint64_t uid;
195  char *filename;
196  char *mime;
198 
201 
202 typedef struct MatroskaChapter {
203  uint64_t start;
204  uint64_t end;
205  uint64_t uid;
206  char *title;
207 
210 
211 typedef struct MatroskaIndexPos {
212  uint64_t track;
213  uint64_t pos;
215 
216 typedef struct MatroskaIndex {
217  uint64_t time;
219 } MatroskaIndex;
220 
221 typedef struct MatroskaTag {
222  char *name;
223  char *string;
224  char *lang;
225  uint64_t def;
227 } MatroskaTag;
228 
229 typedef struct MatroskaTagTarget {
230  char *type;
231  uint64_t typevalue;
232  uint64_t trackuid;
233  uint64_t chapteruid;
234  uint64_t attachuid;
236 
237 typedef struct MatroskaTags {
240 } MatroskaTags;
241 
242 typedef struct MatroskaSeekhead {
243  uint64_t id;
244  uint64_t pos;
246 
247 typedef struct MatroskaLevel {
248  uint64_t start;
249  uint64_t length;
250 } MatroskaLevel;
251 
252 typedef struct MatroskaCluster {
253  uint64_t timecode;
256 
257 typedef struct MatroskaLevel1Element {
258  uint64_t id;
259  uint64_t pos;
260  int parsed;
262 
263 typedef struct MatroskaDemuxContext {
264  const AVClass *class;
266 
267  /* EBML stuff */
270  int level_up;
271  uint32_t current_id;
272 
273  uint64_t time_scale;
274  double duration;
275  char *title;
276  char *muxingapp;
284 
285  /* byte position of the segment inside the stream */
286  int64_t segment_start;
287 
288  /* the packet queue */
292 
293  int done;
294 
295  /* What to skip before effectively reading a packet. */
298 
299  /* File has a CUES element, but we defer parsing until it is needed. */
301 
302  /* Level1 elements and whether they were read yet */
305 
309 
310  /* File has SSA subtitles which prevent incremental cluster parsing. */
312 
313  /* WebM DASH Manifest live flag/ */
314  int is_live;
316 
317 typedef struct MatroskaBlock {
318  uint64_t duration;
319  int64_t reference;
320  uint64_t non_simple;
322  uint64_t additional_id;
325 } MatroskaBlock;
326 
328  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
329  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
330  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
331  { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
332  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
335  { 0 }
336 };
337 
339  { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
340  { 0 }
341 };
342 
344  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
346  { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
348  { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
349  { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
351  { 0 }
352 };
353 
355  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
356  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
357  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
358  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
359  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
360  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
361  { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
370  { 0 }
371 };
372 
374  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
375  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
377  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
378  { 0 }
379 };
380 
384  { 0 }
385 };
386 
395  { 0 }
396 };
398  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
399  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
400  { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
401  { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
403  { 0 }
404 };
405 
407  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
408  { 0 }
409 };
410 
414  { 0 }
415 };
416 
418  { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
419  { 0 }
420 };
421 
423  { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
424  { 0 }
425 };
426 
428  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
430  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
433  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
434  { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
435  { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
436  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
437  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
438  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
439  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
440  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
441  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
442  { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
443  { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
444  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
445  { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
454  { 0 }
455 };
456 
458  { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
459  { 0 }
460 };
461 
464  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
465  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
466  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
468  { 0 }
469 };
470 
472  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
473  { 0 }
474 };
475 
477  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
479  { 0 }
480 };
481 
486  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
491  { 0 }
492 };
493 
495  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
500  { 0 }
501 };
502 
504  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
505  { 0 }
506 };
507 
509  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
514  { 0 }
515 };
516 
518  { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
519  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
520  { 0 }
521 };
522 
524  { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
525  { 0 }
526 };
527 
529  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
530  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
531  { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
532  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
533  { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
534  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
535  { 0 }
536 };
537 
540  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
541  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
542  { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
543  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
544  { 0 }
545 };
546 
548  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
549  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
550  { 0 }
551 };
552 
554  { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
555  { 0 }
556 };
557 
559  { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
560  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
561  { 0 }
562 };
563 
565  { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
566  { 0 }
567 };
568 
570  { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
571  { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
572  { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
573  { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
574  { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
575  { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
576  { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
578  { 0 }
579 };
580 
582  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
583  { 0 }
584 };
585 
587  { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
588  { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
589  { 0 }
590 };
591 
593  { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
594  { 0 }
595 };
596 
598  { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
599  { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
600  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
602  { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
603  { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
605  { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
606  { 0 }
607 };
608 
610  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
611  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
612  { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
615  { 0 }
616 };
617 
619  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
624  { 0 }
625 };
626 
628  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
629  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
630  { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
638  { 0 }
639 };
640 
642  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
647  { 0 }
648 };
649 
651  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
656  { 0 }
657 };
658 
659 static const char *const matroska_doctypes[] = { "matroska", "webm" };
660 
661 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
662 {
663  AVIOContext *pb = matroska->ctx->pb;
664  uint32_t id;
665  matroska->current_id = 0;
666  matroska->num_levels = 0;
667 
668  /* seek to next position to resync from */
669  if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
670  goto eof;
671 
672  id = avio_rb32(pb);
673 
674  // try to find a toplevel element
675  while (!avio_feof(pb)) {
676  if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
677  id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
679  id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
680  matroska->current_id = id;
681  return 0;
682  }
683  id = (id << 8) | avio_r8(pb);
684  }
685 
686 eof:
687  matroska->done = 1;
688  return AVERROR_EOF;
689 }
690 
691 /*
692  * Return: Whether we reached the end of a level in the hierarchy or not.
693  */
695 {
696  AVIOContext *pb = matroska->ctx->pb;
697  int64_t pos = avio_tell(pb);
698 
699  if (matroska->num_levels > 0) {
700  MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
701  if (pos - level->start >= level->length || matroska->current_id) {
702  matroska->num_levels--;
703  return 1;
704  }
705  }
706  return (matroska->is_live && matroska->ctx->pb->eof_reached) ? 1 : 0;
707 }
708 
709 /*
710  * Read: an "EBML number", which is defined as a variable-length
711  * array of bytes. The first byte indicates the length by giving a
712  * number of 0-bits followed by a one. The position of the first
713  * "one" bit inside the first byte indicates the length of this
714  * number.
715  * Returns: number of bytes read, < 0 on error
716  */
718  int max_size, uint64_t *number)
719 {
720  int read = 1, n = 1;
721  uint64_t total = 0;
722 
723  /* The first byte tells us the length in bytes - avio_r8() can normally
724  * return 0, but since that's not a valid first ebmlID byte, we can
725  * use it safely here to catch EOS. */
726  if (!(total = avio_r8(pb))) {
727  /* we might encounter EOS here */
728  if (!avio_feof(pb)) {
729  int64_t pos = avio_tell(pb);
730  av_log(matroska->ctx, AV_LOG_ERROR,
731  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
732  pos, pos);
733  return pb->error ? pb->error : AVERROR(EIO);
734  }
735  return AVERROR_EOF;
736  }
737 
738  /* get the length of the EBML number */
739  read = 8 - ff_log2_tab[total];
740  if (read > max_size) {
741  int64_t pos = avio_tell(pb) - 1;
742  av_log(matroska->ctx, AV_LOG_ERROR,
743  "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
744  (uint8_t) total, pos, pos);
745  return AVERROR_INVALIDDATA;
746  }
747 
748  /* read out length */
749  total ^= 1 << ff_log2_tab[total];
750  while (n++ < read)
751  total = (total << 8) | avio_r8(pb);
752 
753  *number = total;
754 
755  return read;
756 }
757 
758 /**
759  * Read a EBML length value.
760  * This needs special handling for the "unknown length" case which has multiple
761  * encodings.
762  */
764  uint64_t *number)
765 {
766  int res = ebml_read_num(matroska, pb, 8, number);
767  if (res > 0 && *number + 1 == 1ULL << (7 * res))
768  *number = 0xffffffffffffffULL;
769  return res;
770 }
771 
772 /*
773  * Read the next element as an unsigned int.
774  * 0 is success, < 0 is failure.
775  */
776 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
777 {
778  int n = 0;
779 
780  if (size > 8)
781  return AVERROR_INVALIDDATA;
782 
783  /* big-endian ordering; build up number */
784  *num = 0;
785  while (n++ < size)
786  *num = (*num << 8) | avio_r8(pb);
787 
788  return 0;
789 }
790 
791 /*
792  * Read the next element as a signed int.
793  * 0 is success, < 0 is failure.
794  */
795 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
796 {
797  int n = 1;
798 
799  if (size > 8)
800  return AVERROR_INVALIDDATA;
801 
802  if (size == 0) {
803  *num = 0;
804  } else {
805  *num = sign_extend(avio_r8(pb), 8);
806 
807  /* big-endian ordering; build up number */
808  while (n++ < size)
809  *num = (*num << 8) | avio_r8(pb);
810  }
811 
812  return 0;
813 }
814 
815 /*
816  * Read the next element as a float.
817  * 0 is success, < 0 is failure.
818  */
819 static int ebml_read_float(AVIOContext *pb, int size, double *num)
820 {
821  if (size == 0)
822  *num = 0;
823  else if (size == 4)
824  *num = av_int2float(avio_rb32(pb));
825  else if (size == 8)
826  *num = av_int2double(avio_rb64(pb));
827  else
828  return AVERROR_INVALIDDATA;
829 
830  return 0;
831 }
832 
833 /*
834  * Read the next element as an ASCII string.
835  * 0 is success, < 0 is failure.
836  */
837 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
838 {
839  char *res;
840 
841  /* EBML strings are usually not 0-terminated, so we allocate one
842  * byte more, read the string and NULL-terminate it ourselves. */
843  if (!(res = av_malloc(size + 1)))
844  return AVERROR(ENOMEM);
845  if (avio_read(pb, (uint8_t *) res, size) != size) {
846  av_free(res);
847  return AVERROR(EIO);
848  }
849  (res)[size] = '\0';
850  av_free(*str);
851  *str = res;
852 
853  return 0;
854 }
855 
856 /*
857  * Read the next element as binary data.
858  * 0 is success, < 0 is failure.
859  */
860 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
861 {
862  av_fast_padded_malloc(&bin->data, &bin->size, length);
863  if (!bin->data)
864  return AVERROR(ENOMEM);
865 
866  bin->size = length;
867  bin->pos = avio_tell(pb);
868  if (avio_read(pb, bin->data, length) != length) {
869  av_freep(&bin->data);
870  bin->size = 0;
871  return AVERROR(EIO);
872  }
873 
874  return 0;
875 }
876 
877 /*
878  * Read the next element, but only the header. The contents
879  * are supposed to be sub-elements which can be read separately.
880  * 0 is success, < 0 is failure.
881  */
882 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
883 {
884  AVIOContext *pb = matroska->ctx->pb;
886 
887  if (matroska->num_levels >= EBML_MAX_DEPTH) {
888  av_log(matroska->ctx, AV_LOG_ERROR,
889  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
890  return AVERROR(ENOSYS);
891  }
892 
893  level = &matroska->levels[matroska->num_levels++];
894  level->start = avio_tell(pb);
895  level->length = length;
896 
897  return 0;
898 }
899 
900 /*
901  * Read signed/unsigned "EBML" numbers.
902  * Return: number of bytes processed, < 0 on error
903  */
905  uint8_t *data, uint32_t size, uint64_t *num)
906 {
907  AVIOContext pb;
908  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
909  return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
910 }
911 
912 /*
913  * Same as above, but signed.
914  */
916  uint8_t *data, uint32_t size, int64_t *num)
917 {
918  uint64_t unum;
919  int res;
920 
921  /* read as unsigned number first */
922  if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
923  return res;
924 
925  /* make signed (weird way) */
926  *num = unum - ((1LL << (7 * res - 1)) - 1);
927 
928  return res;
929 }
930 
931 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
932  EbmlSyntax *syntax, void *data);
933 
934 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
935  uint32_t id, void *data)
936 {
937  int i;
938  for (i = 0; syntax[i].id; i++)
939  if (id == syntax[i].id)
940  break;
941  if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
942  matroska->num_levels > 0 &&
943  matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
944  return 0; // we reached the end of an unknown size cluster
945  if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
946  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32"\n", id);
947  }
948  return ebml_parse_elem(matroska, &syntax[i], data);
949 }
950 
951 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
952  void *data)
953 {
954  if (!matroska->current_id) {
955  uint64_t id;
956  int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
957  if (res < 0) {
958  // in live mode, finish parsing if EOF is reached.
959  return (matroska->is_live && matroska->ctx->pb->eof_reached &&
960  res == AVERROR_EOF) ? 1 : res;
961  }
962  matroska->current_id = id | 1 << 7 * res;
963  }
964  return ebml_parse_id(matroska, syntax, matroska->current_id, data);
965 }
966 
967 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
968  void *data)
969 {
970  int i, res = 0;
971 
972  for (i = 0; syntax[i].id; i++)
973  switch (syntax[i].type) {
974  case EBML_UINT:
975  *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
976  break;
977  case EBML_FLOAT:
978  *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
979  break;
980  case EBML_STR:
981  case EBML_UTF8:
982  // the default may be NULL
983  if (syntax[i].def.s) {
984  uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
985  *dst = av_strdup(syntax[i].def.s);
986  if (!*dst)
987  return AVERROR(ENOMEM);
988  }
989  break;
990  }
991 
992  while (!res && !ebml_level_end(matroska))
993  res = ebml_parse(matroska, syntax, data);
994 
995  return res;
996 }
997 
998 /*
999  * Allocate and return the entry for the level1 element with the given ID. If
1000  * an entry already exists, return the existing entry.
1001  */
1003  uint32_t id)
1004 {
1005  int i;
1006  MatroskaLevel1Element *elem;
1007 
1008  // Some files link to all clusters; useless.
1009  if (id == MATROSKA_ID_CLUSTER)
1010  return NULL;
1011 
1012  // There can be multiple seekheads.
1013  if (id != MATROSKA_ID_SEEKHEAD) {
1014  for (i = 0; i < matroska->num_level1_elems; i++) {
1015  if (matroska->level1_elems[i].id == id)
1016  return &matroska->level1_elems[i];
1017  }
1018  }
1019 
1020  // Only a completely broken file would have more elements.
1021  // It also provides a low-effort way to escape from circular seekheads
1022  // (every iteration will add a level1 entry).
1023  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1024  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1025  return NULL;
1026  }
1027 
1028  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1029  *elem = (MatroskaLevel1Element){.id = id};
1030 
1031  return elem;
1032 }
1033 
1035  EbmlSyntax *syntax, void *data)
1036 {
1037  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1038  [EBML_UINT] = 8,
1039  [EBML_FLOAT] = 8,
1040  // max. 16 MB for strings
1041  [EBML_STR] = 0x1000000,
1042  [EBML_UTF8] = 0x1000000,
1043  // max. 256 MB for binary data
1044  [EBML_BIN] = 0x10000000,
1045  // no limits for anything else
1046  };
1047  AVIOContext *pb = matroska->ctx->pb;
1048  uint32_t id = syntax->id;
1049  uint64_t length;
1050  int res;
1051  void *newelem;
1052  MatroskaLevel1Element *level1_elem;
1053 
1054  data = (char *) data + syntax->data_offset;
1055  if (syntax->list_elem_size) {
1056  EbmlList *list = data;
1057  newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1058  if (!newelem)
1059  return AVERROR(ENOMEM);
1060  list->elem = newelem;
1061  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1062  memset(data, 0, syntax->list_elem_size);
1063  list->nb_elem++;
1064  }
1065 
1066  if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1067  matroska->current_id = 0;
1068  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1069  return res;
1070  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1071  av_log(matroska->ctx, AV_LOG_ERROR,
1072  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1073  length, max_lengths[syntax->type], syntax->type);
1074  return AVERROR_INVALIDDATA;
1075  }
1076  }
1077 
1078  switch (syntax->type) {
1079  case EBML_UINT:
1080  res = ebml_read_uint(pb, length, data);
1081  break;
1082  case EBML_SINT:
1083  res = ebml_read_sint(pb, length, data);
1084  break;
1085  case EBML_FLOAT:
1086  res = ebml_read_float(pb, length, data);
1087  break;
1088  case EBML_STR:
1089  case EBML_UTF8:
1090  res = ebml_read_ascii(pb, length, data);
1091  break;
1092  case EBML_BIN:
1093  res = ebml_read_binary(pb, length, data);
1094  break;
1095  case EBML_LEVEL1:
1096  case EBML_NEST:
1097  if ((res = ebml_read_master(matroska, length)) < 0)
1098  return res;
1099  if (id == MATROSKA_ID_SEGMENT)
1100  matroska->segment_start = avio_tell(matroska->ctx->pb);
1101  if (id == MATROSKA_ID_CUES)
1102  matroska->cues_parsing_deferred = 0;
1103  if (syntax->type == EBML_LEVEL1 &&
1104  (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1105  if (level1_elem->parsed)
1106  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1107  level1_elem->parsed = 1;
1108  }
1109  return ebml_parse_nest(matroska, syntax->def.n, data);
1110  case EBML_PASS:
1111  return ebml_parse_id(matroska, syntax->def.n, id, data);
1112  case EBML_STOP:
1113  return 1;
1114  default:
1115  if (ffio_limit(pb, length) != length)
1116  return AVERROR(EIO);
1117  return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1118  }
1119  if (res == AVERROR_INVALIDDATA)
1120  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1121  else if (res == AVERROR(EIO))
1122  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1123  return res;
1124 }
1125 
1126 static void ebml_free(EbmlSyntax *syntax, void *data)
1127 {
1128  int i, j;
1129  for (i = 0; syntax[i].id; i++) {
1130  void *data_off = (char *) data + syntax[i].data_offset;
1131  switch (syntax[i].type) {
1132  case EBML_STR:
1133  case EBML_UTF8:
1134  av_freep(data_off);
1135  break;
1136  case EBML_BIN:
1137  av_freep(&((EbmlBin *) data_off)->data);
1138  break;
1139  case EBML_LEVEL1:
1140  case EBML_NEST:
1141  if (syntax[i].list_elem_size) {
1142  EbmlList *list = data_off;
1143  char *ptr = list->elem;
1144  for (j = 0; j < list->nb_elem;
1145  j++, ptr += syntax[i].list_elem_size)
1146  ebml_free(syntax[i].def.n, ptr);
1147  av_freep(&list->elem);
1148  } else
1149  ebml_free(syntax[i].def.n, data_off);
1150  default:
1151  break;
1152  }
1153  }
1154 }
1155 
1156 /*
1157  * Autodetecting...
1158  */
1160 {
1161  uint64_t total = 0;
1162  int len_mask = 0x80, size = 1, n = 1, i;
1163 
1164  /* EBML header? */
1165  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1166  return 0;
1167 
1168  /* length of header */
1169  total = p->buf[4];
1170  while (size <= 8 && !(total & len_mask)) {
1171  size++;
1172  len_mask >>= 1;
1173  }
1174  if (size > 8)
1175  return 0;
1176  total &= (len_mask - 1);
1177  while (n < size)
1178  total = (total << 8) | p->buf[4 + n++];
1179 
1180  /* Does the probe data contain the whole header? */
1181  if (p->buf_size < 4 + size + total)
1182  return 0;
1183 
1184  /* The header should contain a known document type. For now,
1185  * we don't parse the whole header but simply check for the
1186  * availability of that array of characters inside the header.
1187  * Not fully fool-proof, but good enough. */
1188  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1189  int probelen = strlen(matroska_doctypes[i]);
1190  if (total < probelen)
1191  continue;
1192  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1193  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1194  return AVPROBE_SCORE_MAX;
1195  }
1196 
1197  // probably valid EBML header but no recognized doctype
1198  return AVPROBE_SCORE_EXTENSION;
1199 }
1200 
1202  int num)
1203 {
1204  MatroskaTrack *tracks = matroska->tracks.elem;
1205  int i;
1206 
1207  for (i = 0; i < matroska->tracks.nb_elem; i++)
1208  if (tracks[i].num == num)
1209  return &tracks[i];
1210 
1211  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1212  return NULL;
1213 }
1214 
1215 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1216  MatroskaTrack *track)
1217 {
1218  MatroskaTrackEncoding *encodings = track->encodings.elem;
1219  uint8_t *data = *buf;
1220  int isize = *buf_size;
1221  uint8_t *pkt_data = NULL;
1222  uint8_t av_unused *newpktdata;
1223  int pkt_size = isize;
1224  int result = 0;
1225  int olen;
1226 
1227  if (pkt_size >= 10000000U)
1228  return AVERROR_INVALIDDATA;
1229 
1230  switch (encodings[0].compression.algo) {
1232  {
1233  int header_size = encodings[0].compression.settings.size;
1234  uint8_t *header = encodings[0].compression.settings.data;
1235 
1236  if (header_size && !header) {
1237  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1238  return -1;
1239  }
1240 
1241  if (!header_size)
1242  return 0;
1243 
1244  pkt_size = isize + header_size;
1245  pkt_data = av_malloc(pkt_size);
1246  if (!pkt_data)
1247  return AVERROR(ENOMEM);
1248 
1249  memcpy(pkt_data, header, header_size);
1250  memcpy(pkt_data + header_size, data, isize);
1251  break;
1252  }
1253 #if CONFIG_LZO
1255  do {
1256  olen = pkt_size *= 3;
1257  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1258  if (!newpktdata) {
1259  result = AVERROR(ENOMEM);
1260  goto failed;
1261  }
1262  pkt_data = newpktdata;
1263  result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1264  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1265  if (result) {
1266  result = AVERROR_INVALIDDATA;
1267  goto failed;
1268  }
1269  pkt_size -= olen;
1270  break;
1271 #endif
1272 #if CONFIG_ZLIB
1274  {
1275  z_stream zstream = { 0 };
1276  if (inflateInit(&zstream) != Z_OK)
1277  return -1;
1278  zstream.next_in = data;
1279  zstream.avail_in = isize;
1280  do {
1281  pkt_size *= 3;
1282  newpktdata = av_realloc(pkt_data, pkt_size);
1283  if (!newpktdata) {
1284  inflateEnd(&zstream);
1285  goto failed;
1286  }
1287  pkt_data = newpktdata;
1288  zstream.avail_out = pkt_size - zstream.total_out;
1289  zstream.next_out = pkt_data + zstream.total_out;
1290  if (pkt_data) {
1291  result = inflate(&zstream, Z_NO_FLUSH);
1292  } else
1293  result = Z_MEM_ERROR;
1294  } while (result == Z_OK && pkt_size < 10000000);
1295  pkt_size = zstream.total_out;
1296  inflateEnd(&zstream);
1297  if (result != Z_STREAM_END) {
1298  if (result == Z_MEM_ERROR)
1299  result = AVERROR(ENOMEM);
1300  else
1301  result = AVERROR_INVALIDDATA;
1302  goto failed;
1303  }
1304  break;
1305  }
1306 #endif
1307 #if CONFIG_BZLIB
1309  {
1310  bz_stream bzstream = { 0 };
1311  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1312  return -1;
1313  bzstream.next_in = data;
1314  bzstream.avail_in = isize;
1315  do {
1316  pkt_size *= 3;
1317  newpktdata = av_realloc(pkt_data, pkt_size);
1318  if (!newpktdata) {
1319  BZ2_bzDecompressEnd(&bzstream);
1320  goto failed;
1321  }
1322  pkt_data = newpktdata;
1323  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1324  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1325  if (pkt_data) {
1326  result = BZ2_bzDecompress(&bzstream);
1327  } else
1328  result = BZ_MEM_ERROR;
1329  } while (result == BZ_OK && pkt_size < 10000000);
1330  pkt_size = bzstream.total_out_lo32;
1331  BZ2_bzDecompressEnd(&bzstream);
1332  if (result != BZ_STREAM_END) {
1333  if (result == BZ_MEM_ERROR)
1334  result = AVERROR(ENOMEM);
1335  else
1336  result = AVERROR_INVALIDDATA;
1337  goto failed;
1338  }
1339  break;
1340  }
1341 #endif
1342  default:
1343  return AVERROR_INVALIDDATA;
1344  }
1345 
1346  *buf = pkt_data;
1347  *buf_size = pkt_size;
1348  return 0;
1349 
1350 failed:
1351  av_free(pkt_data);
1352  return result;
1353 }
1354 
1356  AVDictionary **metadata, char *prefix)
1357 {
1358  MatroskaTag *tags = list->elem;
1359  char key[1024];
1360  int i;
1361 
1362  for (i = 0; i < list->nb_elem; i++) {
1363  const char *lang = tags[i].lang &&
1364  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1365 
1366  if (!tags[i].name) {
1367  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1368  continue;
1369  }
1370  if (prefix)
1371  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1372  else
1373  av_strlcpy(key, tags[i].name, sizeof(key));
1374  if (tags[i].def || !lang) {
1375  av_dict_set(metadata, key, tags[i].string, 0);
1376  if (tags[i].sub.nb_elem)
1377  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1378  }
1379  if (lang) {
1380  av_strlcat(key, "-", sizeof(key));
1381  av_strlcat(key, lang, sizeof(key));
1382  av_dict_set(metadata, key, tags[i].string, 0);
1383  if (tags[i].sub.nb_elem)
1384  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1385  }
1386  }
1388 }
1389 
1391 {
1392  MatroskaDemuxContext *matroska = s->priv_data;
1393  MatroskaTags *tags = matroska->tags.elem;
1394  int i, j;
1395 
1396  for (i = 0; i < matroska->tags.nb_elem; i++) {
1397  if (tags[i].target.attachuid) {
1398  MatroskaAttachment *attachment = matroska->attachments.elem;
1399  for (j = 0; j < matroska->attachments.nb_elem; j++)
1400  if (attachment[j].uid == tags[i].target.attachuid &&
1401  attachment[j].stream)
1402  matroska_convert_tag(s, &tags[i].tag,
1403  &attachment[j].stream->metadata, NULL);
1404  } else if (tags[i].target.chapteruid) {
1405  MatroskaChapter *chapter = matroska->chapters.elem;
1406  for (j = 0; j < matroska->chapters.nb_elem; j++)
1407  if (chapter[j].uid == tags[i].target.chapteruid &&
1408  chapter[j].chapter)
1409  matroska_convert_tag(s, &tags[i].tag,
1410  &chapter[j].chapter->metadata, NULL);
1411  } else if (tags[i].target.trackuid) {
1412  MatroskaTrack *track = matroska->tracks.elem;
1413  for (j = 0; j < matroska->tracks.nb_elem; j++)
1414  if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1415  matroska_convert_tag(s, &tags[i].tag,
1416  &track[j].stream->metadata, NULL);
1417  } else {
1418  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1419  tags[i].target.type);
1420  }
1421  }
1422 }
1423 
1425  uint64_t pos)
1426 {
1427  uint32_t level_up = matroska->level_up;
1428  uint32_t saved_id = matroska->current_id;
1429  int64_t before_pos = avio_tell(matroska->ctx->pb);
1431  int64_t offset;
1432  int ret = 0;
1433 
1434  /* seek */
1435  offset = pos + matroska->segment_start;
1436  if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1437  /* We don't want to lose our seekhead level, so we add
1438  * a dummy. This is a crude hack. */
1439  if (matroska->num_levels == EBML_MAX_DEPTH) {
1440  av_log(matroska->ctx, AV_LOG_INFO,
1441  "Max EBML element depth (%d) reached, "
1442  "cannot parse further.\n", EBML_MAX_DEPTH);
1443  ret = AVERROR_INVALIDDATA;
1444  } else {
1445  level.start = 0;
1446  level.length = (uint64_t) -1;
1447  matroska->levels[matroska->num_levels] = level;
1448  matroska->num_levels++;
1449  matroska->current_id = 0;
1450 
1451  ret = ebml_parse(matroska, matroska_segment, matroska);
1452 
1453  /* remove dummy level */
1454  while (matroska->num_levels) {
1455  uint64_t length = matroska->levels[--matroska->num_levels].length;
1456  if (length == (uint64_t) -1)
1457  break;
1458  }
1459  }
1460  }
1461  /* seek back */
1462  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1463  matroska->level_up = level_up;
1464  matroska->current_id = saved_id;
1465 
1466  return ret;
1467 }
1468 
1470 {
1471  EbmlList *seekhead_list = &matroska->seekhead;
1472  int i;
1473 
1474  // we should not do any seeking in the streaming case
1475  if (!matroska->ctx->pb->seekable)
1476  return;
1477 
1478  for (i = 0; i < seekhead_list->nb_elem; i++) {
1479  MatroskaSeekhead *seekheads = seekhead_list->elem;
1480  uint32_t id = seekheads[i].id;
1481  uint64_t pos = seekheads[i].pos;
1482 
1483  MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1484  if (!elem || elem->parsed)
1485  continue;
1486 
1487  elem->pos = pos;
1488 
1489  // defer cues parsing until we actually need cue data.
1490  if (id == MATROSKA_ID_CUES)
1491  continue;
1492 
1493  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1494  // mark index as broken
1495  matroska->cues_parsing_deferred = -1;
1496  break;
1497  }
1498 
1499  elem->parsed = 1;
1500  }
1501 }
1502 
1504 {
1505  EbmlList *index_list;
1507  int index_scale = 1;
1508  int i, j;
1509 
1510  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1511  return;
1512 
1513  index_list = &matroska->index;
1514  index = index_list->elem;
1515  if (index_list->nb_elem &&
1516  index[0].time > 1E14 / matroska->time_scale) {
1517  av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1518  index_scale = matroska->time_scale;
1519  }
1520  for (i = 0; i < index_list->nb_elem; i++) {
1521  EbmlList *pos_list = &index[i].pos;
1522  MatroskaIndexPos *pos = pos_list->elem;
1523  for (j = 0; j < pos_list->nb_elem; j++) {
1524  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1525  pos[j].track);
1526  if (track && track->stream)
1527  av_add_index_entry(track->stream,
1528  pos[j].pos + matroska->segment_start,
1529  index[i].time / index_scale, 0, 0,
1531  }
1532  }
1533 }
1534 
1536  int i;
1537 
1538  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1539  return;
1540 
1541  for (i = 0; i < matroska->num_level1_elems; i++) {
1542  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1543  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1544  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1545  matroska->cues_parsing_deferred = -1;
1546  elem->parsed = 1;
1547  break;
1548  }
1549  }
1550 
1551  matroska_add_index_entries(matroska);
1552 }
1553 
1555 {
1556  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1557  int profile;
1558 
1559  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1560  if (strstr(codec_id, aac_profiles[profile]))
1561  break;
1562  return profile + 1;
1563 }
1564 
1565 static int matroska_aac_sri(int samplerate)
1566 {
1567  int sri;
1568 
1569  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1570  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1571  break;
1572  return sri;
1573 }
1574 
1575 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1576 {
1577  char buffer[32];
1578  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1579  time_t creation_time = date_utc / 1000000000 + 978307200;
1580  struct tm tmpbuf, *ptm = gmtime_r(&creation_time, &tmpbuf);
1581  if (!ptm) return;
1582  if (strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm))
1583  av_dict_set(metadata, "creation_time", buffer, 0);
1584 }
1585 
1587  MatroskaTrack *track,
1588  int *offset)
1589 {
1590  AVStream *st = track->stream;
1591  uint8_t *p = track->codec_priv.data;
1592  int size = track->codec_priv.size;
1593 
1594  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1595  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1596  track->codec_priv.size = 0;
1597  return 0;
1598  }
1599  *offset = 8;
1600  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1601 
1602  p += track->codec_priv.size;
1603  size -= track->codec_priv.size;
1604 
1605  /* parse the remaining metadata blocks if present */
1606  while (size >= 4) {
1607  int block_last, block_type, block_size;
1608 
1609  flac_parse_block_header(p, &block_last, &block_type, &block_size);
1610 
1611  p += 4;
1612  size -= 4;
1613  if (block_size > size)
1614  return 0;
1615 
1616  /* check for the channel mask */
1617  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1618  AVDictionary *dict = NULL;
1619  AVDictionaryEntry *chmask;
1620 
1621  ff_vorbis_comment(s, &dict, p, block_size, 0);
1622  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1623  if (chmask) {
1624  uint64_t mask = strtol(chmask->value, NULL, 0);
1625  if (!mask || mask & ~0x3ffffULL) {
1627  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1628  } else
1629  st->codec->channel_layout = mask;
1630  }
1631  av_dict_free(&dict);
1632  }
1633 
1634  p += block_size;
1635  size -= block_size;
1636  }
1637 
1638  return 0;
1639 }
1640 
1642 {
1643  MatroskaDemuxContext *matroska = s->priv_data;
1644  MatroskaTrack *tracks = matroska->tracks.elem;
1645  AVStream *st;
1646  int i, j, ret;
1647  int k;
1648 
1649  for (i = 0; i < matroska->tracks.nb_elem; i++) {
1650  MatroskaTrack *track = &tracks[i];
1652  EbmlList *encodings_list = &track->encodings;
1653  MatroskaTrackEncoding *encodings = encodings_list->elem;
1654  uint8_t *extradata = NULL;
1655  int extradata_size = 0;
1656  int extradata_offset = 0;
1657  uint32_t fourcc = 0;
1658  AVIOContext b;
1659  char* key_id_base64 = NULL;
1660  int bit_depth = -1;
1661 
1662  /* Apply some sanity checks. */
1663  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1664  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1665  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1666  track->type != MATROSKA_TRACK_TYPE_METADATA) {
1667  av_log(matroska->ctx, AV_LOG_INFO,
1668  "Unknown or unsupported track type %"PRIu64"\n",
1669  track->type);
1670  continue;
1671  }
1672  if (!track->codec_id)
1673  continue;
1674 
1675  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1676  if (!track->default_duration && track->video.frame_rate > 0)
1677  track->default_duration = 1000000000 / track->video.frame_rate;
1678  if (track->video.display_width == -1)
1679  track->video.display_width = track->video.pixel_width;
1680  if (track->video.display_height == -1)
1681  track->video.display_height = track->video.pixel_height;
1682  if (track->video.color_space.size == 4)
1683  fourcc = AV_RL32(track->video.color_space.data);
1684  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1685  if (!track->audio.out_samplerate)
1686  track->audio.out_samplerate = track->audio.samplerate;
1687  }
1688  if (encodings_list->nb_elem > 1) {
1689  av_log(matroska->ctx, AV_LOG_ERROR,
1690  "Multiple combined encodings not supported");
1691  } else if (encodings_list->nb_elem == 1) {
1692  if (encodings[0].type) {
1693  if (encodings[0].encryption.key_id.size > 0) {
1694  /* Save the encryption key id to be stored later as a
1695  metadata tag. */
1696  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1697  key_id_base64 = av_malloc(b64_size);
1698  if (key_id_base64 == NULL)
1699  return AVERROR(ENOMEM);
1700 
1701  av_base64_encode(key_id_base64, b64_size,
1702  encodings[0].encryption.key_id.data,
1703  encodings[0].encryption.key_id.size);
1704  } else {
1705  encodings[0].scope = 0;
1706  av_log(matroska->ctx, AV_LOG_ERROR,
1707  "Unsupported encoding type");
1708  }
1709  } else if (
1710 #if CONFIG_ZLIB
1711  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1712 #endif
1713 #if CONFIG_BZLIB
1715 #endif
1716 #if CONFIG_LZO
1718 #endif
1720  encodings[0].scope = 0;
1721  av_log(matroska->ctx, AV_LOG_ERROR,
1722  "Unsupported encoding type");
1723  } else if (track->codec_priv.size && encodings[0].scope & 2) {
1724  uint8_t *codec_priv = track->codec_priv.data;
1725  int ret = matroska_decode_buffer(&track->codec_priv.data,
1726  &track->codec_priv.size,
1727  track);
1728  if (ret < 0) {
1729  track->codec_priv.data = NULL;
1730  track->codec_priv.size = 0;
1731  av_log(matroska->ctx, AV_LOG_ERROR,
1732  "Failed to decode codec private data\n");
1733  }
1734 
1735  if (codec_priv != track->codec_priv.data)
1736  av_free(codec_priv);
1737  }
1738  }
1739 
1740  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1741  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1742  strlen(ff_mkv_codec_tags[j].str))) {
1743  codec_id = ff_mkv_codec_tags[j].id;
1744  break;
1745  }
1746  }
1747 
1748  st = track->stream = avformat_new_stream(s, NULL);
1749  if (!st) {
1750  av_free(key_id_base64);
1751  return AVERROR(ENOMEM);
1752  }
1753 
1754  if (key_id_base64) {
1755  /* export encryption key id as base64 metadata tag */
1756  av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1757  av_freep(&key_id_base64);
1758  }
1759 
1760  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1761  track->codec_priv.size >= 40 &&
1762  track->codec_priv.data) {
1763  track->ms_compat = 1;
1764  bit_depth = AV_RL16(track->codec_priv.data + 14);
1765  fourcc = AV_RL32(track->codec_priv.data + 16);
1767  fourcc);
1768  if (!codec_id)
1770  fourcc);
1771  extradata_offset = 40;
1772  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1773  track->codec_priv.size >= 14 &&
1774  track->codec_priv.data) {
1775  int ret;
1776  ffio_init_context(&b, track->codec_priv.data,
1777  track->codec_priv.size,
1778  0, NULL, NULL, NULL, NULL);
1779  ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size, 0);
1780  if (ret < 0)
1781  return ret;
1782  codec_id = st->codec->codec_id;
1783  extradata_offset = FFMIN(track->codec_priv.size, 18);
1784  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1785  && (track->codec_priv.size >= 86)
1786  && (track->codec_priv.data)) {
1787  fourcc = AV_RL32(track->codec_priv.data + 4);
1788  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1790  fourcc = AV_RL32(track->codec_priv.data);
1791  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1792  }
1793  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1794  (track->codec_priv.size >= 21) &&
1795  (track->codec_priv.data)) {
1796  fourcc = AV_RL32(track->codec_priv.data + 4);
1797  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1799  fourcc = AV_RL32(track->codec_priv.data);
1800  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1801  }
1802  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1803  codec_id = AV_CODEC_ID_SVQ3;
1804  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1805  switch (track->audio.bitdepth) {
1806  case 8:
1807  codec_id = AV_CODEC_ID_PCM_U8;
1808  break;
1809  case 24:
1810  codec_id = AV_CODEC_ID_PCM_S24BE;
1811  break;
1812  case 32:
1813  codec_id = AV_CODEC_ID_PCM_S32BE;
1814  break;
1815  }
1816  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1817  switch (track->audio.bitdepth) {
1818  case 8:
1819  codec_id = AV_CODEC_ID_PCM_U8;
1820  break;
1821  case 24:
1822  codec_id = AV_CODEC_ID_PCM_S24LE;
1823  break;
1824  case 32:
1825  codec_id = AV_CODEC_ID_PCM_S32LE;
1826  break;
1827  }
1828  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1829  track->audio.bitdepth == 64) {
1830  codec_id = AV_CODEC_ID_PCM_F64LE;
1831  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1832  int profile = matroska_aac_profile(track->codec_id);
1833  int sri = matroska_aac_sri(track->audio.samplerate);
1834  extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1835  if (!extradata)
1836  return AVERROR(ENOMEM);
1837  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1838  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1839  if (strstr(track->codec_id, "SBR")) {
1840  sri = matroska_aac_sri(track->audio.out_samplerate);
1841  extradata[2] = 0x56;
1842  extradata[3] = 0xE5;
1843  extradata[4] = 0x80 | (sri << 3);
1844  extradata_size = 5;
1845  } else
1846  extradata_size = 2;
1847  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1848  /* Only ALAC's magic cookie is stored in Matroska's track headers.
1849  * Create the "atom size", "tag", and "tag version" fields the
1850  * decoder expects manually. */
1851  extradata_size = 12 + track->codec_priv.size;
1852  extradata = av_mallocz(extradata_size +
1854  if (!extradata)
1855  return AVERROR(ENOMEM);
1856  AV_WB32(extradata, extradata_size);
1857  memcpy(&extradata[4], "alac", 4);
1858  AV_WB32(&extradata[8], 0);
1859  memcpy(&extradata[12], track->codec_priv.data,
1860  track->codec_priv.size);
1861  } else if (codec_id == AV_CODEC_ID_TTA) {
1862  extradata_size = 30;
1863  extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1864  if (!extradata)
1865  return AVERROR(ENOMEM);
1866  ffio_init_context(&b, extradata, extradata_size, 1,
1867  NULL, NULL, NULL, NULL);
1868  avio_write(&b, "TTA1", 4);
1869  avio_wl16(&b, 1);
1870  avio_wl16(&b, track->audio.channels);
1871  avio_wl16(&b, track->audio.bitdepth);
1872  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1873  return AVERROR_INVALIDDATA;
1874  avio_wl32(&b, track->audio.out_samplerate);
1875  avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1876  track->audio.out_samplerate,
1877  AV_TIME_BASE * 1000));
1878  } else if (codec_id == AV_CODEC_ID_RV10 ||
1879  codec_id == AV_CODEC_ID_RV20 ||
1880  codec_id == AV_CODEC_ID_RV30 ||
1881  codec_id == AV_CODEC_ID_RV40) {
1882  extradata_offset = 26;
1883  } else if (codec_id == AV_CODEC_ID_RA_144) {
1884  track->audio.out_samplerate = 8000;
1885  track->audio.channels = 1;
1886  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1887  codec_id == AV_CODEC_ID_COOK ||
1888  codec_id == AV_CODEC_ID_ATRAC3 ||
1889  codec_id == AV_CODEC_ID_SIPR)
1890  && track->codec_priv.data) {
1891  int flavor;
1892 
1893  ffio_init_context(&b, track->codec_priv.data,
1894  track->codec_priv.size,
1895  0, NULL, NULL, NULL, NULL);
1896  avio_skip(&b, 22);
1897  flavor = avio_rb16(&b);
1898  track->audio.coded_framesize = avio_rb32(&b);
1899  avio_skip(&b, 12);
1900  track->audio.sub_packet_h = avio_rb16(&b);
1901  track->audio.frame_size = avio_rb16(&b);
1902  track->audio.sub_packet_size = avio_rb16(&b);
1903  if (flavor < 0 ||
1904  track->audio.coded_framesize <= 0 ||
1905  track->audio.sub_packet_h <= 0 ||
1906  track->audio.frame_size <= 0 ||
1907  track->audio.sub_packet_size <= 0)
1908  return AVERROR_INVALIDDATA;
1909  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1910  track->audio.frame_size);
1911  if (!track->audio.buf)
1912  return AVERROR(ENOMEM);
1913  if (codec_id == AV_CODEC_ID_RA_288) {
1914  st->codec->block_align = track->audio.coded_framesize;
1915  track->codec_priv.size = 0;
1916  } else {
1917  if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1918  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1919  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1920  st->codec->bit_rate = sipr_bit_rate[flavor];
1921  }
1922  st->codec->block_align = track->audio.sub_packet_size;
1923  extradata_offset = 78;
1924  }
1925  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
1926  ret = matroska_parse_flac(s, track, &extradata_offset);
1927  if (ret < 0)
1928  return ret;
1929  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1930  fourcc = AV_RL32(track->codec_priv.data);
1931  }
1932  track->codec_priv.size -= extradata_offset;
1933 
1934  if (codec_id == AV_CODEC_ID_NONE)
1935  av_log(matroska->ctx, AV_LOG_INFO,
1936  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1937 
1938  if (track->time_scale < 0.01)
1939  track->time_scale = 1.0;
1940  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1941  1000 * 1000 * 1000); /* 64 bit pts in ns */
1942 
1943  /* convert the delay from ns to the track timebase */
1944  track->codec_delay = av_rescale_q(track->codec_delay,
1945  (AVRational){ 1, 1000000000 },
1946  st->time_base);
1947 
1948  st->codec->codec_id = codec_id;
1949 
1950  if (strcmp(track->language, "und"))
1951  av_dict_set(&st->metadata, "language", track->language, 0);
1952  av_dict_set(&st->metadata, "title", track->name, 0);
1953 
1954  if (track->flag_default)
1956  if (track->flag_forced)
1958 
1959  if (!st->codec->extradata) {
1960  if (extradata) {
1961  st->codec->extradata = extradata;
1962  st->codec->extradata_size = extradata_size;
1963  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1964  if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1965  return AVERROR(ENOMEM);
1966  memcpy(st->codec->extradata,
1967  track->codec_priv.data + extradata_offset,
1968  track->codec_priv.size);
1969  }
1970  }
1971 
1972  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1973  MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1974 
1976  st->codec->codec_tag = fourcc;
1977  if (bit_depth >= 0)
1978  st->codec->bits_per_coded_sample = bit_depth;
1979  st->codec->width = track->video.pixel_width;
1980  st->codec->height = track->video.pixel_height;
1982  &st->sample_aspect_ratio.den,
1983  st->codec->height * track->video.display_width,
1984  st->codec->width * track->video.display_height,
1985  255);
1986  if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1988 
1989  if (track->default_duration) {
1991  1000000000, track->default_duration, 30000);
1992 #if FF_API_R_FRAME_RATE
1993  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
1994  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
1995  st->r_frame_rate = st->avg_frame_rate;
1996 #endif
1997  }
1998 
1999  /* export stereo mode flag as metadata tag */
2000  if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2001  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2002 
2003  /* export alpha mode flag as metadata tag */
2004  if (track->video.alpha_mode)
2005  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2006 
2007  /* if we have virtual track, mark the real tracks */
2008  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2009  char buf[32];
2010  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2011  continue;
2012  snprintf(buf, sizeof(buf), "%s_%d",
2013  ff_matroska_video_stereo_plane[planes[j].type], i);
2014  for (k=0; k < matroska->tracks.nb_elem; k++)
2015  if (planes[j].uid == tracks[k].uid) {
2016  av_dict_set(&s->streams[k]->metadata,
2017  "stereo_mode", buf, 0);
2018  break;
2019  }
2020  }
2021  // add stream level stereo3d side data if it is a supported format
2022  if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2023  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2024  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2025  if (ret < 0)
2026  return ret;
2027  }
2028  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2030  st->codec->sample_rate = track->audio.out_samplerate;
2031  st->codec->channels = track->audio.channels;
2032  if (!st->codec->bits_per_coded_sample)
2033  st->codec->bits_per_coded_sample = track->audio.bitdepth;
2034  if (st->codec->codec_id != AV_CODEC_ID_AAC)
2036  if (track->codec_delay > 0) {
2037  st->codec->delay = av_rescale_q(track->codec_delay,
2038  st->time_base,
2039  (AVRational){1, st->codec->sample_rate});
2040  }
2041  if (track->seek_preroll > 0) {
2043  av_rescale_q(track->seek_preroll,
2044  (AVRational){1, 1000000000},
2045  (AVRational){1, st->codec->sample_rate}));
2046  }
2047  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2048  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2049 
2050  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2051  st->disposition |= AV_DISPOSITION_CAPTIONS;
2052  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2053  st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2054  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2055  st->disposition |= AV_DISPOSITION_METADATA;
2056  }
2057  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2058  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
2059  if (st->codec->codec_id == AV_CODEC_ID_ASS)
2060  matroska->contains_ssa = 1;
2061  }
2062  }
2063 
2064  return 0;
2065 }
2066 
2068 {
2069  MatroskaDemuxContext *matroska = s->priv_data;
2070  EbmlList *attachments_list = &matroska->attachments;
2071  EbmlList *chapters_list = &matroska->chapters;
2072  MatroskaAttachment *attachments;
2073  MatroskaChapter *chapters;
2074  uint64_t max_start = 0;
2075  int64_t pos;
2076  Ebml ebml = { 0 };
2077  int i, j, res;
2078 
2079  matroska->ctx = s;
2080  matroska->cues_parsing_deferred = 1;
2081 
2082  /* First read the EBML header. */
2083  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2084  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2085  ebml_free(ebml_syntax, &ebml);
2086  return AVERROR_INVALIDDATA;
2087  }
2088  if (ebml.version > EBML_VERSION ||
2089  ebml.max_size > sizeof(uint64_t) ||
2090  ebml.id_length > sizeof(uint32_t) ||
2091  ebml.doctype_version > 3) {
2092  av_log(matroska->ctx, AV_LOG_ERROR,
2093  "EBML header using unsupported features\n"
2094  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2095  ebml.version, ebml.doctype, ebml.doctype_version);
2096  ebml_free(ebml_syntax, &ebml);
2097  return AVERROR_PATCHWELCOME;
2098  } else if (ebml.doctype_version == 3) {
2099  av_log(matroska->ctx, AV_LOG_WARNING,
2100  "EBML header using unsupported features\n"
2101  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2102  ebml.version, ebml.doctype, ebml.doctype_version);
2103  }
2104  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2105  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2106  break;
2107  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2108  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2109  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2110  ebml_free(ebml_syntax, &ebml);
2111  return AVERROR_INVALIDDATA;
2112  }
2113  }
2114  ebml_free(ebml_syntax, &ebml);
2115 
2116  /* The next thing is a segment. */
2117  pos = avio_tell(matroska->ctx->pb);
2118  res = ebml_parse(matroska, matroska_segments, matroska);
2119  // try resyncing until we find a EBML_STOP type element.
2120  while (res != 1) {
2121  res = matroska_resync(matroska, pos);
2122  if (res < 0)
2123  return res;
2124  pos = avio_tell(matroska->ctx->pb);
2125  res = ebml_parse(matroska, matroska_segment, matroska);
2126  }
2127  matroska_execute_seekhead(matroska);
2128 
2129  if (!matroska->time_scale)
2130  matroska->time_scale = 1000000;
2131  if (matroska->duration)
2132  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2133  1000 / AV_TIME_BASE;
2134  av_dict_set(&s->metadata, "title", matroska->title, 0);
2135  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2136 
2137  if (matroska->date_utc.size == 8)
2139 
2140  res = matroska_parse_tracks(s);
2141  if (res < 0)
2142  return res;
2143 
2144  attachments = attachments_list->elem;
2145  for (j = 0; j < attachments_list->nb_elem; j++) {
2146  if (!(attachments[j].filename && attachments[j].mime &&
2147  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2148  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2149  } else {
2150  AVStream *st = avformat_new_stream(s, NULL);
2151  if (!st)
2152  break;
2153  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2154  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2156 
2157  for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2158  if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2159  strlen(ff_mkv_image_mime_tags[i].str))) {
2161  break;
2162  }
2163  }
2164 
2165  attachments[j].stream = st;
2166 
2167  if (st->codec->codec_id != AV_CODEC_ID_NONE) {
2170 
2172  if ((res = av_new_packet(&st->attached_pic, attachments[j].bin.size)) < 0)
2173  return res;
2174  memcpy(st->attached_pic.data, attachments[j].bin.data, attachments[j].bin.size);
2175  st->attached_pic.stream_index = st->index;
2177  } else {
2179  if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2180  break;
2181  memcpy(st->codec->extradata, attachments[j].bin.data,
2182  attachments[j].bin.size);
2183 
2184  for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2185  if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2186  strlen(ff_mkv_mime_tags[i].str))) {
2187  st->codec->codec_id = ff_mkv_mime_tags[i].id;
2188  break;
2189  }
2190  }
2191  }
2192  }
2193  }
2194 
2195  chapters = chapters_list->elem;
2196  for (i = 0; i < chapters_list->nb_elem; i++)
2197  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2198  (max_start == 0 || chapters[i].start > max_start)) {
2199  chapters[i].chapter =
2200  avpriv_new_chapter(s, chapters[i].uid,
2201  (AVRational) { 1, 1000000000 },
2202  chapters[i].start, chapters[i].end,
2203  chapters[i].title);
2204  if (chapters[i].chapter) {
2205  av_dict_set(&chapters[i].chapter->metadata,
2206  "title", chapters[i].title, 0);
2207  }
2208  max_start = chapters[i].start;
2209  }
2210 
2211  matroska_add_index_entries(matroska);
2212 
2214 
2215  return 0;
2216 }
2217 
2218 /*
2219  * Put one packet in an application-supplied AVPacket struct.
2220  * Returns 0 on success or -1 on failure.
2221  */
2223  AVPacket *pkt)
2224 {
2225  if (matroska->num_packets > 0) {
2226  memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2227  av_freep(&matroska->packets[0]);
2228  if (matroska->num_packets > 1) {
2229  void *newpackets;
2230  memmove(&matroska->packets[0], &matroska->packets[1],
2231  (matroska->num_packets - 1) * sizeof(AVPacket *));
2232  newpackets = av_realloc(matroska->packets,
2233  (matroska->num_packets - 1) *
2234  sizeof(AVPacket *));
2235  if (newpackets)
2236  matroska->packets = newpackets;
2237  } else {
2238  av_freep(&matroska->packets);
2239  matroska->prev_pkt = NULL;
2240  }
2241  matroska->num_packets--;
2242  return 0;
2243  }
2244 
2245  return -1;
2246 }
2247 
2248 /*
2249  * Free all packets in our internal queue.
2250  */
2252 {
2253  matroska->prev_pkt = NULL;
2254  if (matroska->packets) {
2255  int n;
2256  for (n = 0; n < matroska->num_packets; n++) {
2257  av_free_packet(matroska->packets[n]);
2258  av_freep(&matroska->packets[n]);
2259  }
2260  av_freep(&matroska->packets);
2261  matroska->num_packets = 0;
2262  }
2263 }
2264 
2266  int *buf_size, int type,
2267  uint32_t **lace_buf, int *laces)
2268 {
2269  int res = 0, n, size = *buf_size;
2270  uint8_t *data = *buf;
2271  uint32_t *lace_size;
2272 
2273  if (!type) {
2274  *laces = 1;
2275  *lace_buf = av_mallocz(sizeof(int));
2276  if (!*lace_buf)
2277  return AVERROR(ENOMEM);
2278 
2279  *lace_buf[0] = size;
2280  return 0;
2281  }
2282 
2283  av_assert0(size > 0);
2284  *laces = *data + 1;
2285  data += 1;
2286  size -= 1;
2287  lace_size = av_mallocz(*laces * sizeof(int));
2288  if (!lace_size)
2289  return AVERROR(ENOMEM);
2290 
2291  switch (type) {
2292  case 0x1: /* Xiph lacing */
2293  {
2294  uint8_t temp;
2295  uint32_t total = 0;
2296  for (n = 0; res == 0 && n < *laces - 1; n++) {
2297  while (1) {
2298  if (size <= total) {
2299  res = AVERROR_INVALIDDATA;
2300  break;
2301  }
2302  temp = *data;
2303  total += temp;
2304  lace_size[n] += temp;
2305  data += 1;
2306  size -= 1;
2307  if (temp != 0xff)
2308  break;
2309  }
2310  }
2311  if (size <= total) {
2312  res = AVERROR_INVALIDDATA;
2313  break;
2314  }
2315 
2316  lace_size[n] = size - total;
2317  break;
2318  }
2319 
2320  case 0x2: /* fixed-size lacing */
2321  if (size % (*laces)) {
2322  res = AVERROR_INVALIDDATA;
2323  break;
2324  }
2325  for (n = 0; n < *laces; n++)
2326  lace_size[n] = size / *laces;
2327  break;
2328 
2329  case 0x3: /* EBML lacing */
2330  {
2331  uint64_t num;
2332  uint64_t total;
2333  n = matroska_ebmlnum_uint(matroska, data, size, &num);
2334  if (n < 0 || num > INT_MAX) {
2335  av_log(matroska->ctx, AV_LOG_INFO,
2336  "EBML block data error\n");
2337  res = n<0 ? n : AVERROR_INVALIDDATA;
2338  break;
2339  }
2340  data += n;
2341  size -= n;
2342  total = lace_size[0] = num;
2343  for (n = 1; res == 0 && n < *laces - 1; n++) {
2344  int64_t snum;
2345  int r;
2346  r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2347  if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2348  av_log(matroska->ctx, AV_LOG_INFO,
2349  "EBML block data error\n");
2350  res = r<0 ? r : AVERROR_INVALIDDATA;
2351  break;
2352  }
2353  data += r;
2354  size -= r;
2355  lace_size[n] = lace_size[n - 1] + snum;
2356  total += lace_size[n];
2357  }
2358  if (size <= total) {
2359  res = AVERROR_INVALIDDATA;
2360  break;
2361  }
2362  lace_size[*laces - 1] = size - total;
2363  break;
2364  }
2365  }
2366 
2367  *buf = data;
2368  *lace_buf = lace_size;
2369  *buf_size = size;
2370 
2371  return res;
2372 }
2373 
2375  MatroskaTrack *track, AVStream *st,
2376  uint8_t *data, int size, uint64_t timecode,
2377  int64_t pos)
2378 {
2379  int a = st->codec->block_align;
2380  int sps = track->audio.sub_packet_size;
2381  int cfs = track->audio.coded_framesize;
2382  int h = track->audio.sub_packet_h;
2383  int y = track->audio.sub_packet_cnt;
2384  int w = track->audio.frame_size;
2385  int x;
2386 
2387  if (!track->audio.pkt_cnt) {
2388  if (track->audio.sub_packet_cnt == 0)
2389  track->audio.buf_timecode = timecode;
2390  if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2391  if (size < cfs * h / 2) {
2392  av_log(matroska->ctx, AV_LOG_ERROR,
2393  "Corrupt int4 RM-style audio packet size\n");
2394  return AVERROR_INVALIDDATA;
2395  }
2396  for (x = 0; x < h / 2; x++)
2397  memcpy(track->audio.buf + x * 2 * w + y * cfs,
2398  data + x * cfs, cfs);
2399  } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2400  if (size < w) {
2401  av_log(matroska->ctx, AV_LOG_ERROR,
2402  "Corrupt sipr RM-style audio packet size\n");
2403  return AVERROR_INVALIDDATA;
2404  }
2405  memcpy(track->audio.buf + y * w, data, w);
2406  } else {
2407  if (size < sps * w / sps || h<=0 || w%sps) {
2408  av_log(matroska->ctx, AV_LOG_ERROR,
2409  "Corrupt generic RM-style audio packet size\n");
2410  return AVERROR_INVALIDDATA;
2411  }
2412  for (x = 0; x < w / sps; x++)
2413  memcpy(track->audio.buf +
2414  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2415  data + x * sps, sps);
2416  }
2417 
2418  if (++track->audio.sub_packet_cnt >= h) {
2419  if (st->codec->codec_id == AV_CODEC_ID_SIPR)
2420  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2421  track->audio.sub_packet_cnt = 0;
2422  track->audio.pkt_cnt = h * w / a;
2423  }
2424  }
2425 
2426  while (track->audio.pkt_cnt) {
2427  int ret;
2428  AVPacket *pkt = av_mallocz(sizeof(AVPacket));
2429  if (!pkt)
2430  return AVERROR(ENOMEM);
2431 
2432  ret = av_new_packet(pkt, a);
2433  if (ret < 0) {
2434  av_free(pkt);
2435  return ret;
2436  }
2437  memcpy(pkt->data,
2438  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2439  a);
2440  pkt->pts = track->audio.buf_timecode;
2442  pkt->pos = pos;
2443  pkt->stream_index = st->index;
2444  dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2445  }
2446 
2447  return 0;
2448 }
2449 
2450 /* reconstruct full wavpack blocks from mangled matroska ones */
2452  uint8_t **pdst, int *size)
2453 {
2454  uint8_t *dst = NULL;
2455  int dstlen = 0;
2456  int srclen = *size;
2457  uint32_t samples;
2458  uint16_t ver;
2459  int ret, offset = 0;
2460 
2461  if (srclen < 12 || track->stream->codec->extradata_size < 2)
2462  return AVERROR_INVALIDDATA;
2463 
2464  ver = AV_RL16(track->stream->codec->extradata);
2465 
2466  samples = AV_RL32(src);
2467  src += 4;
2468  srclen -= 4;
2469 
2470  while (srclen >= 8) {
2471  int multiblock;
2472  uint32_t blocksize;
2473  uint8_t *tmp;
2474 
2475  uint32_t flags = AV_RL32(src);
2476  uint32_t crc = AV_RL32(src + 4);
2477  src += 8;
2478  srclen -= 8;
2479 
2480  multiblock = (flags & 0x1800) != 0x1800;
2481  if (multiblock) {
2482  if (srclen < 4) {
2483  ret = AVERROR_INVALIDDATA;
2484  goto fail;
2485  }
2486  blocksize = AV_RL32(src);
2487  src += 4;
2488  srclen -= 4;
2489  } else
2490  blocksize = srclen;
2491 
2492  if (blocksize > srclen) {
2493  ret = AVERROR_INVALIDDATA;
2494  goto fail;
2495  }
2496 
2497  tmp = av_realloc(dst, dstlen + blocksize + 32);
2498  if (!tmp) {
2499  ret = AVERROR(ENOMEM);
2500  goto fail;
2501  }
2502  dst = tmp;
2503  dstlen += blocksize + 32;
2504 
2505  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2506  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2507  AV_WL16(dst + offset + 8, ver); // version
2508  AV_WL16(dst + offset + 10, 0); // track/index_no
2509  AV_WL32(dst + offset + 12, 0); // total samples
2510  AV_WL32(dst + offset + 16, 0); // block index
2511  AV_WL32(dst + offset + 20, samples); // number of samples
2512  AV_WL32(dst + offset + 24, flags); // flags
2513  AV_WL32(dst + offset + 28, crc); // crc
2514  memcpy(dst + offset + 32, src, blocksize); // block data
2515 
2516  src += blocksize;
2517  srclen -= blocksize;
2518  offset += blocksize + 32;
2519  }
2520 
2521  *pdst = dst;
2522  *size = dstlen;
2523 
2524  return 0;
2525 
2526 fail:
2527  av_freep(&dst);
2528  return ret;
2529 }
2530 
2532  MatroskaTrack *track,
2533  AVStream *st,
2534  uint8_t *data, int data_len,
2535  uint64_t timecode,
2536  uint64_t duration,
2537  int64_t pos)
2538 {
2539  AVPacket *pkt;
2540  uint8_t *id, *settings, *text, *buf;
2541  int id_len, settings_len, text_len;
2542  uint8_t *p, *q;
2543  int err;
2544 
2545  if (data_len <= 0)
2546  return AVERROR_INVALIDDATA;
2547 
2548  p = data;
2549  q = data + data_len;
2550 
2551  id = p;
2552  id_len = -1;
2553  while (p < q) {
2554  if (*p == '\r' || *p == '\n') {
2555  id_len = p - id;
2556  if (*p == '\r')
2557  p++;
2558  break;
2559  }
2560  p++;
2561  }
2562 
2563  if (p >= q || *p != '\n')
2564  return AVERROR_INVALIDDATA;
2565  p++;
2566 
2567  settings = p;
2568  settings_len = -1;
2569  while (p < q) {
2570  if (*p == '\r' || *p == '\n') {
2571  settings_len = p - settings;
2572  if (*p == '\r')
2573  p++;
2574  break;
2575  }
2576  p++;
2577  }
2578 
2579  if (p >= q || *p != '\n')
2580  return AVERROR_INVALIDDATA;
2581  p++;
2582 
2583  text = p;
2584  text_len = q - p;
2585  while (text_len > 0) {
2586  const int len = text_len - 1;
2587  const uint8_t c = p[len];
2588  if (c != '\r' && c != '\n')
2589  break;
2590  text_len = len;
2591  }
2592 
2593  if (text_len <= 0)
2594  return AVERROR_INVALIDDATA;
2595 
2596  pkt = av_mallocz(sizeof(*pkt));
2597  if (!pkt)
2598  return AVERROR(ENOMEM);
2599  err = av_new_packet(pkt, text_len);
2600  if (err < 0) {
2601  av_free(pkt);
2602  return AVERROR(err);
2603  }
2604 
2605  memcpy(pkt->data, text, text_len);
2606 
2607  if (id_len > 0) {
2608  buf = av_packet_new_side_data(pkt,
2610  id_len);
2611  if (!buf) {
2612  av_free(pkt);
2613  return AVERROR(ENOMEM);
2614  }
2615  memcpy(buf, id, id_len);
2616  }
2617 
2618  if (settings_len > 0) {
2619  buf = av_packet_new_side_data(pkt,
2621  settings_len);
2622  if (!buf) {
2623  av_free(pkt);
2624  return AVERROR(ENOMEM);
2625  }
2626  memcpy(buf, settings, settings_len);
2627  }
2628 
2629  // Do we need this for subtitles?
2630  // pkt->flags = AV_PKT_FLAG_KEY;
2631 
2632  pkt->stream_index = st->index;
2633  pkt->pts = timecode;
2634 
2635  // Do we need this for subtitles?
2636  // pkt->dts = timecode;
2637 
2638  pkt->duration = duration;
2639  pkt->pos = pos;
2640 
2641  dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2642  matroska->prev_pkt = pkt;
2643 
2644  return 0;
2645 }
2646 
2648  MatroskaTrack *track, AVStream *st,
2649  uint8_t *data, int pkt_size,
2650  uint64_t timecode, uint64_t lace_duration,
2651  int64_t pos, int is_keyframe,
2652  uint8_t *additional, uint64_t additional_id, int additional_size,
2653  int64_t discard_padding)
2654 {
2655  MatroskaTrackEncoding *encodings = track->encodings.elem;
2656  uint8_t *pkt_data = data;
2657  int offset = 0, res;
2658  AVPacket *pkt;
2659 
2660  if (encodings && !encodings->type && encodings->scope & 1) {
2661  res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2662  if (res < 0)
2663  return res;
2664  }
2665 
2666  if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2667  uint8_t *wv_data;
2668  res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2669  if (res < 0) {
2670  av_log(matroska->ctx, AV_LOG_ERROR,
2671  "Error parsing a wavpack block.\n");
2672  goto fail;
2673  }
2674  if (pkt_data != data)
2675  av_freep(&pkt_data);
2676  pkt_data = wv_data;
2677  }
2678 
2679  if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2680  AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2681  offset = 8;
2682 
2683  pkt = av_mallocz(sizeof(AVPacket));
2684  if (!pkt) {
2685  if (pkt_data != data)
2686  av_freep(&pkt_data);
2687  return AVERROR(ENOMEM);
2688  }
2689  /* XXX: prevent data copy... */
2690  if (av_new_packet(pkt, pkt_size + offset) < 0) {
2691  av_free(pkt);
2692  res = AVERROR(ENOMEM);
2693  goto fail;
2694  }
2695 
2696  if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2697  uint8_t *buf = pkt->data;
2698  bytestream_put_be32(&buf, pkt_size);
2699  bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2700  }
2701 
2702  memcpy(pkt->data + offset, pkt_data, pkt_size);
2703 
2704  if (pkt_data != data)
2705  av_freep(&pkt_data);
2706 
2707  pkt->flags = is_keyframe;
2708  pkt->stream_index = st->index;
2709 
2710  if (additional_size > 0) {
2711  uint8_t *side_data = av_packet_new_side_data(pkt,
2713  additional_size + 8);
2714  if (!side_data) {
2715  av_free_packet(pkt);
2716  av_free(pkt);
2717  return AVERROR(ENOMEM);
2718  }
2719  AV_WB64(side_data, additional_id);
2720  memcpy(side_data + 8, additional, additional_size);
2721  }
2722 
2723  if (discard_padding) {
2724  uint8_t *side_data = av_packet_new_side_data(pkt,
2726  10);
2727  if (!side_data) {
2728  av_free_packet(pkt);
2729  av_free(pkt);
2730  return AVERROR(ENOMEM);
2731  }
2732  AV_WL32(side_data, 0);
2733  AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2734  (AVRational){1, 1000000000},
2735  (AVRational){1, st->codec->sample_rate}));
2736  }
2737 
2738  if (track->ms_compat)
2739  pkt->dts = timecode;
2740  else
2741  pkt->pts = timecode;
2742  pkt->pos = pos;
2743  if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2744  /*
2745  * For backward compatibility.
2746  * Historically, we have put subtitle duration
2747  * in convergence_duration, on the off chance
2748  * that the time_scale is less than 1us, which
2749  * could result in a 32bit overflow on the
2750  * normal duration field.
2751  */
2752  pkt->convergence_duration = lace_duration;
2753  }
2754 
2755  if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2756  lace_duration <= INT_MAX) {
2757  /*
2758  * For non subtitle tracks, just store the duration
2759  * as normal.
2760  *
2761  * If it's a subtitle track and duration value does
2762  * not overflow a uint32, then also store it normally.
2763  */
2764  pkt->duration = lace_duration;
2765  }
2766 
2767  dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2768  matroska->prev_pkt = pkt;
2769 
2770  return 0;
2771 
2772 fail:
2773  if (pkt_data != data)
2774  av_freep(&pkt_data);
2775  return res;
2776 }
2777 
2779  int size, int64_t pos, uint64_t cluster_time,
2780  uint64_t block_duration, int is_keyframe,
2781  uint8_t *additional, uint64_t additional_id, int additional_size,
2782  int64_t cluster_pos, int64_t discard_padding)
2783 {
2784  uint64_t timecode = AV_NOPTS_VALUE;
2785  MatroskaTrack *track;
2786  int res = 0;
2787  AVStream *st;
2788  int16_t block_time;
2789  uint32_t *lace_size = NULL;
2790  int n, flags, laces = 0;
2791  uint64_t num;
2792  int trust_default_duration = 1;
2793 
2794  if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2795  av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2796  return n;
2797  }
2798  data += n;
2799  size -= n;
2800 
2801  track = matroska_find_track_by_num(matroska, num);
2802  if (!track || !track->stream) {
2803  av_log(matroska->ctx, AV_LOG_INFO,
2804  "Invalid stream %"PRIu64" or size %u\n", num, size);
2805  return AVERROR_INVALIDDATA;
2806  } else if (size <= 3)
2807  return 0;
2808  st = track->stream;
2809  if (st->discard >= AVDISCARD_ALL)
2810  return res;
2811  av_assert1(block_duration != AV_NOPTS_VALUE);
2812 
2813  block_time = sign_extend(AV_RB16(data), 16);
2814  data += 2;
2815  flags = *data++;
2816  size -= 3;
2817  if (is_keyframe == -1)
2818  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2819 
2820  if (cluster_time != (uint64_t) -1 &&
2821  (block_time >= 0 || cluster_time >= -block_time)) {
2822  timecode = cluster_time + block_time - track->codec_delay;
2823  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2824  timecode < track->end_timecode)
2825  is_keyframe = 0; /* overlapping subtitles are not key frame */
2826  if (is_keyframe)
2827  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2829  }
2830 
2831  if (matroska->skip_to_keyframe &&
2832  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2833  if (timecode < matroska->skip_to_timecode)
2834  return res;
2835  if (is_keyframe)
2836  matroska->skip_to_keyframe = 0;
2837  else if (!st->skip_to_keyframe) {
2838  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2839  matroska->skip_to_keyframe = 0;
2840  }
2841  }
2842 
2843  res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2844  &lace_size, &laces);
2845 
2846  if (res)
2847  goto end;
2848 
2849  if (track->audio.samplerate == 8000) {
2850  // If this is needed for more codecs, then add them here
2851  if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2852  if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2853  trust_default_duration = 0;
2854  }
2855  }
2856 
2857  if (!block_duration && trust_default_duration)
2858  block_duration = track->default_duration * laces / matroska->time_scale;
2859 
2860  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2861  track->end_timecode =
2862  FFMAX(track->end_timecode, timecode + block_duration);
2863 
2864  for (n = 0; n < laces; n++) {
2865  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2866 
2867  if (lace_size[n] > size) {
2868  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2869  break;
2870  }
2871 
2872  if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2873  st->codec->codec_id == AV_CODEC_ID_COOK ||
2874  st->codec->codec_id == AV_CODEC_ID_SIPR ||
2875  st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2876  st->codec->block_align && track->audio.sub_packet_size) {
2877  res = matroska_parse_rm_audio(matroska, track, st, data,
2878  lace_size[n],
2879  timecode, pos);
2880  if (res)
2881  goto end;
2882 
2883  } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2884  res = matroska_parse_webvtt(matroska, track, st,
2885  data, lace_size[n],
2886  timecode, lace_duration,
2887  pos);
2888  if (res)
2889  goto end;
2890  } else {
2891  res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2892  timecode, lace_duration, pos,
2893  !n ? is_keyframe : 0,
2894  additional, additional_id, additional_size,
2895  discard_padding);
2896  if (res)
2897  goto end;
2898  }
2899 
2900  if (timecode != AV_NOPTS_VALUE)
2901  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2902  data += lace_size[n];
2903  size -= lace_size[n];
2904  }
2905 
2906 end:
2907  av_free(lace_size);
2908  return res;
2909 }
2910 
2912 {
2913  EbmlList *blocks_list;
2914  MatroskaBlock *blocks;
2915  int i, res;
2916  res = ebml_parse(matroska,
2917  matroska_cluster_incremental_parsing,
2918  &matroska->current_cluster);
2919  if (res == 1) {
2920  /* New Cluster */
2921  if (matroska->current_cluster_pos)
2922  ebml_level_end(matroska);
2923  ebml_free(matroska_cluster, &matroska->current_cluster);
2924  memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2925  matroska->current_cluster_num_blocks = 0;
2926  matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2927  matroska->prev_pkt = NULL;
2928  /* sizeof the ID which was already read */
2929  if (matroska->current_id)
2930  matroska->current_cluster_pos -= 4;
2931  res = ebml_parse(matroska,
2932  matroska_clusters_incremental,
2933  &matroska->current_cluster);
2934  /* Try parsing the block again. */
2935  if (res == 1)
2936  res = ebml_parse(matroska,
2937  matroska_cluster_incremental_parsing,
2938  &matroska->current_cluster);
2939  }
2940 
2941  if (!res &&
2942  matroska->current_cluster_num_blocks <
2943  matroska->current_cluster.blocks.nb_elem) {
2944  blocks_list = &matroska->current_cluster.blocks;
2945  blocks = blocks_list->elem;
2946 
2947  matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2948  i = blocks_list->nb_elem - 1;
2949  if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2950  int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2951  uint8_t* additional = blocks[i].additional.size > 0 ?
2952  blocks[i].additional.data : NULL;
2953  if (!blocks[i].non_simple)
2954  blocks[i].duration = 0;
2955  res = matroska_parse_block(matroska, blocks[i].bin.data,
2956  blocks[i].bin.size, blocks[i].bin.pos,
2957  matroska->current_cluster.timecode,
2958  blocks[i].duration, is_keyframe,
2959  additional, blocks[i].additional_id,
2960  blocks[i].additional.size,
2961  matroska->current_cluster_pos,
2962  blocks[i].discard_padding);
2963  }
2964  }
2965 
2966  return res;
2967 }
2968 
2970 {
2971  MatroskaCluster cluster = { 0 };
2972  EbmlList *blocks_list;
2973  MatroskaBlock *blocks;
2974  int i, res;
2975  int64_t pos;
2976 
2977  if (!matroska->contains_ssa)
2978  return matroska_parse_cluster_incremental(matroska);
2979  pos = avio_tell(matroska->ctx->pb);
2980  matroska->prev_pkt = NULL;
2981  if (matroska->current_id)
2982  pos -= 4; /* sizeof the ID which was already read */
2983  res = ebml_parse(matroska, matroska_clusters, &cluster);
2984  blocks_list = &cluster.blocks;
2985  blocks = blocks_list->elem;
2986  for (i = 0; i < blocks_list->nb_elem; i++)
2987  if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2988  int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2989  res = matroska_parse_block(matroska, blocks[i].bin.data,
2990  blocks[i].bin.size, blocks[i].bin.pos,
2991  cluster.timecode, blocks[i].duration,
2992  is_keyframe, NULL, 0, 0, pos,
2993  blocks[i].discard_padding);
2994  }
2995  ebml_free(matroska_cluster, &cluster);
2996  return res;
2997 }
2998 
3000 {
3001  MatroskaDemuxContext *matroska = s->priv_data;
3002 
3003  while (matroska_deliver_packet(matroska, pkt)) {
3004  int64_t pos = avio_tell(matroska->ctx->pb);
3005  if (matroska->done)
3006  return AVERROR_EOF;
3007  if (matroska_parse_cluster(matroska) < 0)
3008  matroska_resync(matroska, pos);
3009  }
3010 
3011  return 0;
3012 }
3013 
3014 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3015  int64_t timestamp, int flags)
3016 {
3017  MatroskaDemuxContext *matroska = s->priv_data;
3018  MatroskaTrack *tracks = NULL;
3019  AVStream *st = s->streams[stream_index];
3020  int i, index, index_sub, index_min;
3021 
3022  /* Parse the CUES now since we need the index data to seek. */
3023  if (matroska->cues_parsing_deferred > 0) {
3024  matroska->cues_parsing_deferred = 0;
3025  matroska_parse_cues(matroska);
3026  }
3027 
3028  if (!st->nb_index_entries)
3029  goto err;
3030  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3031 
3032  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3033  avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
3034  SEEK_SET);
3035  matroska->current_id = 0;
3036  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3037  matroska_clear_queue(matroska);
3038  if (matroska_parse_cluster(matroska) < 0)
3039  break;
3040  }
3041  }
3042 
3043  matroska_clear_queue(matroska);
3044  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3045  goto err;
3046 
3047  index_min = index;
3048  tracks = matroska->tracks.elem;
3049  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3050  tracks[i].audio.pkt_cnt = 0;
3051  tracks[i].audio.sub_packet_cnt = 0;
3052  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3053  tracks[i].end_timecode = 0;
3054  if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3055  tracks[i].stream->discard != AVDISCARD_ALL) {
3056  index_sub = av_index_search_timestamp(
3057  tracks[i].stream, st->index_entries[index].timestamp,
3059  while (index_sub >= 0 &&
3060  index_min > 0 &&
3061  tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
3062  st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
3063  index_min--;
3064  }
3065  }
3066 
3067  avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
3068  matroska->current_id = 0;
3069  if (flags & AVSEEK_FLAG_ANY) {
3070  st->skip_to_keyframe = 0;
3071  matroska->skip_to_timecode = timestamp;
3072  } else {
3073  st->skip_to_keyframe = 1;
3074  matroska->skip_to_timecode = st->index_entries[index].timestamp;
3075  }
3076  matroska->skip_to_keyframe = 1;
3077  matroska->done = 0;
3078  matroska->num_levels = 0;
3079  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3080  return 0;
3081 err:
3082  // slightly hackish but allows proper fallback to
3083  // the generic seeking code.
3084  matroska_clear_queue(matroska);
3085  matroska->current_id = 0;
3086  st->skip_to_keyframe =
3087  matroska->skip_to_keyframe = 0;
3088  matroska->done = 0;
3089  matroska->num_levels = 0;
3090  return -1;
3091 }
3092 
3094 {
3095  MatroskaDemuxContext *matroska = s->priv_data;
3096  MatroskaTrack *tracks = matroska->tracks.elem;
3097  int n;
3098 
3099  matroska_clear_queue(matroska);
3100 
3101  for (n = 0; n < matroska->tracks.nb_elem; n++)
3102  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3103  av_freep(&tracks[n].audio.buf);
3104  ebml_free(matroska_cluster, &matroska->current_cluster);
3105  ebml_free(matroska_segment, matroska);
3106 
3107  return 0;
3108 }
3109 
3110 typedef struct {
3111  int64_t start_time_ns;
3112  int64_t end_time_ns;
3113  int64_t start_offset;
3114  int64_t end_offset;
3115 } CueDesc;
3116 
3117 /* This function searches all the Cues and returns the CueDesc corresponding the
3118  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3119  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3120  */
3121 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3122  MatroskaDemuxContext *matroska = s->priv_data;
3123  CueDesc cue_desc;
3124  int i;
3125  int nb_index_entries = s->streams[0]->nb_index_entries;
3126  AVIndexEntry *index_entries = s->streams[0]->index_entries;
3127  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3128  for (i = 1; i < nb_index_entries; i++) {
3129  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3130  index_entries[i].timestamp * matroska->time_scale > ts) {
3131  break;
3132  }
3133  }
3134  --i;
3135  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3136  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3137  if (i != nb_index_entries - 1) {
3138  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3139  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3140  } else {
3141  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3142  // FIXME: this needs special handling for files where Cues appear
3143  // before Clusters. the current logic assumes Cues appear after
3144  // Clusters.
3145  cue_desc.end_offset = cues_start - matroska->segment_start;
3146  }
3147  return cue_desc;
3148 }
3149 
3151 {
3152  MatroskaDemuxContext *matroska = s->priv_data;
3153  int64_t cluster_pos, before_pos;
3154  int index, rv = 1;
3155  if (s->streams[0]->nb_index_entries <= 0) return 0;
3156  // seek to the first cluster using cues.
3157  index = av_index_search_timestamp(s->streams[0], 0, 0);
3158  if (index < 0) return 0;
3159  cluster_pos = s->streams[0]->index_entries[index].pos;
3160  before_pos = avio_tell(s->pb);
3161  while (1) {
3162  int64_t cluster_id = 0, cluster_length = 0;
3163  AVPacket *pkt;
3164  avio_seek(s->pb, cluster_pos, SEEK_SET);
3165  // read cluster id and length
3166  ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
3167  ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3168  if (cluster_id != 0xF43B675) { // done with all clusters
3169  break;
3170  }
3171  avio_seek(s->pb, cluster_pos, SEEK_SET);
3172  matroska->current_id = 0;
3173  matroska_clear_queue(matroska);
3174  if (matroska_parse_cluster(matroska) < 0 ||
3175  matroska->num_packets <= 0) {
3176  break;
3177  }
3178  pkt = matroska->packets[0];
3179  cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
3180  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3181  rv = 0;
3182  break;
3183  }
3184  }
3185  avio_seek(s->pb, before_pos, SEEK_SET);
3186  return rv;
3187 }
3188 
3189 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3190  double min_buffer, double* buffer,
3191  double* sec_to_download, AVFormatContext *s,
3192  int64_t cues_start)
3193 {
3194  double nano_seconds_per_second = 1000000000.0;
3195  double time_sec = time_ns / nano_seconds_per_second;
3196  int rv = 0;
3197  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3198  int64_t end_time_ns = time_ns + time_to_search_ns;
3199  double sec_downloaded = 0.0;
3200  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3201  if (desc_curr.start_time_ns == -1)
3202  return -1;
3203  *sec_to_download = 0.0;
3204 
3205  // Check for non cue start time.
3206  if (time_ns > desc_curr.start_time_ns) {
3207  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3208  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3209  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3210  double timeToDownload = (cueBytes * 8.0) / bps;
3211 
3212  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3213  *sec_to_download += timeToDownload;
3214 
3215  // Check if the search ends within the first cue.
3216  if (desc_curr.end_time_ns >= end_time_ns) {
3217  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3218  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3219  sec_downloaded = percent_to_sub * sec_downloaded;
3220  *sec_to_download = percent_to_sub * *sec_to_download;
3221  }
3222 
3223  if ((sec_downloaded + *buffer) <= min_buffer) {
3224  return 1;
3225  }
3226 
3227  // Get the next Cue.
3228  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3229  }
3230 
3231  while (desc_curr.start_time_ns != -1) {
3232  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3233  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3234  double desc_sec = desc_ns / nano_seconds_per_second;
3235  double bits = (desc_bytes * 8.0);
3236  double time_to_download = bits / bps;
3237 
3238  sec_downloaded += desc_sec - time_to_download;
3239  *sec_to_download += time_to_download;
3240 
3241  if (desc_curr.end_time_ns >= end_time_ns) {
3242  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3243  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3244  sec_downloaded = percent_to_sub * sec_downloaded;
3245  *sec_to_download = percent_to_sub * *sec_to_download;
3246 
3247  if ((sec_downloaded + *buffer) <= min_buffer)
3248  rv = 1;
3249  break;
3250  }
3251 
3252  if ((sec_downloaded + *buffer) <= min_buffer) {
3253  rv = 1;
3254  break;
3255  }
3256 
3257  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3258  }
3259  *buffer = *buffer + sec_downloaded;
3260  return rv;
3261 }
3262 
3263 /* This function computes the bandwidth of the WebM file with the help of
3264  * buffer_size_after_time_downloaded() function. Both of these functions are
3265  * adapted from WebM Tools project and are adapted to work with FFmpeg's
3266  * Matroska parsing mechanism.
3267  *
3268  * Returns the bandwidth of the file on success; -1 on error.
3269  * */
3270 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3271 {
3272  MatroskaDemuxContext *matroska = s->priv_data;
3273  AVStream *st = s->streams[0];
3274  double bandwidth = 0.0;
3275  int i;
3276 
3277  for (i = 0; i < st->nb_index_entries; i++) {
3278  int64_t prebuffer_ns = 1000000000;
3279  int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3280  double nano_seconds_per_second = 1000000000.0;
3281  int64_t prebuffered_ns = time_ns + prebuffer_ns;
3282  double prebuffer_bytes = 0.0;
3283  int64_t temp_prebuffer_ns = prebuffer_ns;
3284  int64_t pre_bytes, pre_ns;
3285  double pre_sec, prebuffer, bits_per_second;
3286  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3287 
3288  // Start with the first Cue.
3289  CueDesc desc_end = desc_beg;
3290 
3291  // Figure out how much data we have downloaded for the prebuffer. This will
3292  // be used later to adjust the bits per sample to try.
3293  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3294  // Prebuffered the entire Cue.
3295  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3296  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3297  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3298  }
3299  if (desc_end.start_time_ns == -1) {
3300  // The prebuffer is larger than the duration.
3301  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3302  return -1;
3303  bits_per_second = 0.0;
3304  } else {
3305  // The prebuffer ends in the last Cue. Estimate how much data was
3306  // prebuffered.
3307  pre_bytes = desc_end.end_offset - desc_end.start_offset;
3308  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3309  pre_sec = pre_ns / nano_seconds_per_second;
3310  prebuffer_bytes +=
3311  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3312 
3313  prebuffer = prebuffer_ns / nano_seconds_per_second;
3314 
3315  // Set this to 0.0 in case our prebuffer buffers the entire video.
3316  bits_per_second = 0.0;
3317  do {
3318  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3319  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3320  double desc_sec = desc_ns / nano_seconds_per_second;
3321  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3322 
3323  // Drop the bps by the percentage of bytes buffered.
3324  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3325  double mod_bits_per_second = calc_bits_per_second * percent;
3326 
3327  if (prebuffer < desc_sec) {
3328  double search_sec =
3329  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3330 
3331  // Add 1 so the bits per second should be a little bit greater than file
3332  // datarate.
3333  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3334  const double min_buffer = 0.0;
3335  double buffer = prebuffer;
3336  double sec_to_download = 0.0;
3337 
3338  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3339  min_buffer, &buffer, &sec_to_download,
3340  s, cues_start);
3341  if (rv < 0) {
3342  return -1;
3343  } else if (rv == 0) {
3344  bits_per_second = (double)(bps);
3345  break;
3346  }
3347  }
3348 
3349  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3350  } while (desc_end.start_time_ns != -1);
3351  }
3352  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3353  }
3354  return (int64_t)bandwidth;
3355 }
3356 
3358 {
3359  MatroskaDemuxContext *matroska = s->priv_data;
3360  EbmlList *seekhead_list = &matroska->seekhead;
3361  MatroskaSeekhead *seekhead = seekhead_list->elem;
3362  char *buf;
3363  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3364  int i;
3365 
3366  // determine cues start and end positions
3367  for (i = 0; i < seekhead_list->nb_elem; i++)
3368  if (seekhead[i].id == MATROSKA_ID_CUES)
3369  break;
3370 
3371  if (i >= seekhead_list->nb_elem) return -1;
3372 
3373  before_pos = avio_tell(matroska->ctx->pb);
3374  cues_start = seekhead[i].pos + matroska->segment_start;
3375  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
3376  // cues_end is computed as cues_start + cues_length + length of the
3377  // Cues element ID + EBML length of the Cues element. cues_end is
3378  // inclusive and the above sum is reduced by 1.
3379  uint64_t cues_length = 0, cues_id = 0, bytes_read = 0;
3380  bytes_read += ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
3381  bytes_read += ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
3382  cues_end = cues_start + cues_length + bytes_read - 1;
3383  }
3384  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3385  if (cues_start == -1 || cues_end == -1) return -1;
3386 
3387  // parse the cues
3388  matroska_parse_cues(matroska);
3389 
3390  // cues start
3391  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
3392 
3393  // cues end
3394  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
3395 
3396  // bandwidth
3397  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
3398  if (bandwidth < 0) return -1;
3399  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
3400 
3401  // check if all clusters start with key frames
3403 
3404  // store cue point timestamps as a comma separated list for checking subsegment alignment in
3405  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3406  buf = av_malloc_array(s->streams[0]->nb_index_entries, 20 * sizeof(char));
3407  if (!buf) return -1;
3408  strcpy(buf, "");
3409  for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
3410  snprintf(buf, (i + 1) * 20 * sizeof(char),
3411  "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
3412  if (i != s->streams[0]->nb_index_entries - 1)
3413  strncat(buf, ",", sizeof(char));
3414  }
3415  av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
3416  av_free(buf);
3417 
3418  return 0;
3419 }
3420 
3422 {
3423  char *buf;
3424  int ret = matroska_read_header(s);
3425  MatroskaTrack *tracks;
3426  MatroskaDemuxContext *matroska = s->priv_data;
3427  if (ret) {
3428  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
3429  return -1;
3430  }
3431 
3432  if (!matroska->is_live) {
3433  buf = av_asprintf("%g", matroska->duration);
3434  if (!buf) return AVERROR(ENOMEM);
3435  av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
3436  av_free(buf);
3437 
3438  // initialization range
3439  // 5 is the offset of Cluster ID.
3441  }
3442 
3443  // basename of the file
3444  buf = strrchr(s->filename, '/');
3445  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->filename, 0);
3446 
3447  // track number
3448  tracks = matroska->tracks.elem;
3449  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
3450 
3451  // parse the cues and populate Cue related fields
3452  return matroska->is_live ? 0 : webm_dash_manifest_cues(s);
3453 }
3454 
3456 {
3457  return AVERROR_EOF;
3458 }
3459 
3460 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
3461 static const AVOption options[] = {
3462  { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
3463  { NULL },
3464 };
3465 
3466 static const AVClass webm_dash_class = {
3467  .class_name = "WebM DASH Manifest demuxer",
3468  .item_name = av_default_item_name,
3469  .option = options,
3470  .version = LIBAVUTIL_VERSION_INT,
3471 };
3472 
3474  .name = "matroska,webm",
3475  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3476  .extensions = "mkv,mk3d,mka,mks",
3477  .priv_data_size = sizeof(MatroskaDemuxContext),
3483  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3484 };
3485 
3487  .name = "webm_dash_manifest",
3488  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
3489  .priv_data_size = sizeof(MatroskaDemuxContext),
3493  .priv_class = &webm_dash_class,
3494 };