FFmpeg
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"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/opt.h"
46 #include "libavutil/spherical.h"
47 
48 #include "libavcodec/bytestream.h"
49 #include "libavcodec/flac.h"
50 #include "libavcodec/mpeg4audio.h"
51 
52 #include "avformat.h"
53 #include "avio_internal.h"
54 #include "internal.h"
55 #include "isom.h"
56 #include "matroska.h"
57 #include "oggdec.h"
58 /* For ff_codec_get_id(). */
59 #include "riff.h"
60 #include "rmsipr.h"
61 
62 #if CONFIG_BZLIB
63 #include <bzlib.h>
64 #endif
65 #if CONFIG_ZLIB
66 #include <zlib.h>
67 #endif
68 
69 #include "qtpalette.h"
70 
71 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
72 #define NEEDS_CHECKING 2 /* Indicates that some error checks
73  * still need to be performed */
74 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
75  * syntax level used for parsing ended. */
76 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
77  * of unkown, potentially damaged data is encountered,
78  * it is considered an error. */
79 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
80  * to this many bytes of unknown data for the
81  * SKIP_THRESHOLD check. */
82 
83 typedef enum {
95 } EbmlType;
96 
97 typedef const struct EbmlSyntax {
98  uint32_t id;
101  size_t data_offset;
102  union {
103  int64_t i;
104  uint64_t u;
105  double f;
106  const char *s;
107  const struct EbmlSyntax *n;
108  } def;
109 } EbmlSyntax;
110 
111 typedef struct EbmlList {
112  int nb_elem;
113  unsigned int alloc_elem_size;
114  void *elem;
115 } EbmlList;
116 
117 typedef struct EbmlBin {
118  int size;
121  int64_t pos;
122 } EbmlBin;
123 
124 typedef struct Ebml {
125  uint64_t version;
126  uint64_t max_size;
127  uint64_t id_length;
128  char *doctype;
129  uint64_t doctype_version;
130 } Ebml;
131 
132 typedef struct MatroskaTrackCompression {
133  uint64_t algo;
136 
137 typedef struct MatroskaTrackEncryption {
138  uint64_t algo;
141 
142 typedef struct MatroskaTrackEncoding {
143  uint64_t scope;
144  uint64_t type;
148 
149 typedef struct MatroskaMasteringMeta {
150  double r_x;
151  double r_y;
152  double g_x;
153  double g_y;
154  double b_x;
155  double b_y;
156  double white_x;
157  double white_y;
161 
162 typedef struct MatroskaTrackVideoColor {
165  uint64_t chroma_sub_horz;
166  uint64_t chroma_sub_vert;
167  uint64_t cb_sub_horz;
168  uint64_t cb_sub_vert;
171  uint64_t range;
173  uint64_t primaries;
174  uint64_t max_cll;
175  uint64_t max_fall;
178 
180  uint64_t type;
181  EbmlBin private;
182  double yaw;
183  double pitch;
184  double roll;
186 
187 typedef struct MatroskaTrackVideo {
188  double frame_rate;
189  uint64_t display_width;
190  uint64_t display_height;
191  uint64_t pixel_width;
192  uint64_t pixel_height;
194  uint64_t display_unit;
195  uint64_t interlaced;
196  uint64_t field_order;
197  uint64_t stereo_mode;
198  uint64_t alpha_mode;
202 
203 typedef struct MatroskaTrackAudio {
204  double samplerate;
206  uint64_t bitdepth;
207  uint64_t channels;
208 
209  /* real audio header (extracted from extradata) */
215  int pkt_cnt;
216  uint64_t buf_timecode;
219 
220 typedef struct MatroskaTrackPlane {
221  uint64_t uid;
222  uint64_t type;
224 
225 typedef struct MatroskaTrackOperation {
228 
229 typedef struct MatroskaTrack {
230  uint64_t num;
231  uint64_t uid;
232  uint64_t type;
233  char *name;
234  char *codec_id;
236  char *language;
237  double time_scale;
239  uint64_t flag_default;
240  uint64_t flag_forced;
241  uint64_t seek_preroll;
246  uint64_t codec_delay;
248 
250  int64_t end_timecode;
253 
254  uint32_t palette[AVPALETTE_COUNT];
256 } MatroskaTrack;
257 
258 typedef struct MatroskaAttachment {
259  uint64_t uid;
260  char *filename;
261  char *mime;
263 
266 
267 typedef struct MatroskaChapter {
268  uint64_t start;
269  uint64_t end;
270  uint64_t uid;
271  char *title;
272 
275 
276 typedef struct MatroskaIndexPos {
277  uint64_t track;
278  uint64_t pos;
280 
281 typedef struct MatroskaIndex {
282  uint64_t time;
284 } MatroskaIndex;
285 
286 typedef struct MatroskaTag {
287  char *name;
288  char *string;
289  char *lang;
290  uint64_t def;
292 } MatroskaTag;
293 
294 typedef struct MatroskaTagTarget {
295  char *type;
296  uint64_t typevalue;
297  uint64_t trackuid;
298  uint64_t chapteruid;
299  uint64_t attachuid;
301 
302 typedef struct MatroskaTags {
305 } MatroskaTags;
306 
307 typedef struct MatroskaSeekhead {
308  uint64_t id;
309  uint64_t pos;
311 
312 typedef struct MatroskaLevel {
313  uint64_t start;
314  uint64_t length;
315 } MatroskaLevel;
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 
327 typedef struct MatroskaCluster {
329  uint64_t timecode;
330  int64_t pos;
332 
333 typedef struct MatroskaLevel1Element {
334  int64_t pos;
335  uint32_t id;
336  int parsed;
338 
339 typedef struct MatroskaDemuxContext {
340  const AVClass *class;
342 
343  /* EBML stuff */
346  uint32_t current_id;
347  int64_t resync_pos;
349 
350  uint64_t time_scale;
351  double duration;
352  char *title;
353  char *muxingapp;
361 
362  /* byte position of the segment inside the stream */
363  int64_t segment_start;
364 
365  /* the packet queue */
368 
369  int done;
370 
371  /* What to skip before effectively reading a packet. */
374 
375  /* File has a CUES element, but we defer parsing until it is needed. */
377 
378  /* Level1 elements and whether they were read yet */
379  MatroskaLevel1Element level1_elems[64];
381 
383 
384  /* WebM DASH Manifest live flag */
385  int is_live;
386 
387  /* Bandwidth value for WebM DASH Manifest */
390 
391 #define CHILD_OF(parent) { .def = { .n = parent } }
392 
393 // The following forward declarations need their size because
394 // a tentative definition with internal linkage must not be an
395 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
396 // Removing the sizes breaks MSVC.
403 
405  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
406  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
407  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
408  { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
409  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
411  { EBML_ID_DOCTYPEVERSION, EBML_NONE },
412  CHILD_OF(ebml_syntax)
413 };
414 
415 static EbmlSyntax ebml_syntax[] = {
416  { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
418  { 0 }
419 };
420 
422  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
424  { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
426  { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
427  { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
428  { MATROSKA_ID_SEGMENTUID, EBML_NONE },
429  CHILD_OF(matroska_segment)
430 };
431 
433  { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
434  { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
435  { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
436  { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
437  { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
438  { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
439  { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
440  { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
441  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
442  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
443  CHILD_OF(matroska_track_video_color)
444 };
445 
446 static EbmlSyntax matroska_track_video_color[] = {
447  { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
448  { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
449  { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
450  { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
451  { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
452  { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
458  { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
459  { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
460  { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
461  CHILD_OF(matroska_track_video)
462 };
463 
470  CHILD_OF(matroska_track_video)
471 };
472 
473 static EbmlSyntax matroska_track_video[] = {
474  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
475  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
476  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
477  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
478  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
479  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
480  { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
481  { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
482  { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
484  { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
485  { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
486  { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
491  { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
492  CHILD_OF(matroska_track)
493 };
494 
496  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
497  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
498  { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
499  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
500  CHILD_OF(matroska_track)
501 };
502 
506  CHILD_OF(matroska_track_encoding)
507 };
508 
513  { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
514  { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
515  { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
516  { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
517  CHILD_OF(matroska_track_encoding)
518 };
519 static EbmlSyntax matroska_track_encoding[] = {
520  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
521  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
522  { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
523  { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
525  CHILD_OF(matroska_track_encodings)
526 };
527 
528 static EbmlSyntax matroska_track_encodings[] = {
529  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
530  CHILD_OF(matroska_track)
531 };
532 
536  CHILD_OF(matroska_track_combine_planes)
537 };
538 
539 static EbmlSyntax matroska_track_combine_planes[] = {
540  { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
541  CHILD_OF(matroska_track_operation)
542 };
543 
544 static EbmlSyntax matroska_track_operation[] = {
545  { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
546  CHILD_OF(matroska_track)
547 };
548 
549 static EbmlSyntax matroska_track[] = {
550  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
552  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
555  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
556  { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
557  { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
558  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
559  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
560  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
561  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
562  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
563  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
564  { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
565  { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
566  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
567  { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
569  { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
570  { MATROSKA_ID_CODECNAME, EBML_NONE },
571  { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
572  { MATROSKA_ID_CODECINFOURL, EBML_NONE },
573  { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
574  { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
575  { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
576  CHILD_OF(matroska_tracks)
577 };
578 
579 static EbmlSyntax matroska_tracks[] = {
580  { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
581  CHILD_OF(matroska_segment)
582 };
583 
586  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
587  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
588  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
590  CHILD_OF(matroska_attachments)
591 };
592 
593 static EbmlSyntax matroska_attachments[] = {
594  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
595  CHILD_OF(matroska_segment)
596 };
597 
599  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
601  { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
602  CHILD_OF(matroska_chapter_entry)
603 };
604 
605 static EbmlSyntax matroska_chapter_entry[] = {
609  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
611  { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
612  { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
613  { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
614  CHILD_OF(matroska_chapter)
615 };
616 
617 static EbmlSyntax matroska_chapter[] = {
618  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
620  { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
621  { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
622  { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
623  CHILD_OF(matroska_chapters)
624 };
625 
626 static EbmlSyntax matroska_chapters[] = {
627  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
628  CHILD_OF(matroska_segment)
629 };
630 
632  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
635  { MATROSKA_ID_CUEDURATION, EBML_NONE },
636  { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
637  CHILD_OF(matroska_index_entry)
638 };
639 
640 static EbmlSyntax matroska_index_entry[] = {
641  { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
642  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
643  CHILD_OF(matroska_index)
644 };
645 
646 static EbmlSyntax matroska_index[] = {
647  { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
648  CHILD_OF(matroska_segment)
649 };
650 
652  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
653  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
654  { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
655  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
657  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
658  CHILD_OF(matroska_tag)
659 };
660 
663  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
664  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
665  { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
666  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
667  CHILD_OF(matroska_tag)
668 };
669 
670 static EbmlSyntax matroska_tag[] = {
671  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
672  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
673  CHILD_OF(matroska_tags)
674 };
675 
676 static EbmlSyntax matroska_tags[] = {
677  { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
678  CHILD_OF(matroska_segment)
679 };
680 
682  { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
683  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
684  CHILD_OF(matroska_seekhead)
685 };
686 
687 static EbmlSyntax matroska_seekhead[] = {
688  { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
689  CHILD_OF(matroska_segment)
690 };
691 
692 static EbmlSyntax matroska_segment[] = {
694  { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
695  { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
696  { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
697  { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
698  { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
699  { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
700  { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
701  { 0 } /* We don't want to go back to level 0, so don't add the parent. */
702 };
703 
705  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
706  { 0 }
707 };
708 
710  { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
711  { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
712  CHILD_OF(matroska_blockadditions)
713 };
714 
715 static EbmlSyntax matroska_blockadditions[] = {
716  { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
717  CHILD_OF(matroska_blockgroup)
718 };
719 
720 static EbmlSyntax matroska_blockgroup[] = {
721  { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
722  { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
724  { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
725  { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
727  { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
728  CHILD_OF(matroska_cluster_parsing)
729 };
730 
731 // The following array contains SimpleBlock and BlockGroup twice
732 // in order to reuse the other values for matroska_cluster_enter.
733 static EbmlSyntax matroska_cluster_parsing[] = {
734  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
735  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
736  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
738  { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
740  { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
741  CHILD_OF(matroska_segment)
742 };
743 
745  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
746  { 0 }
747 };
748 #undef CHILD_OF
749 
750 static const char *const matroska_doctypes[] = { "matroska", "webm" };
751 
753 
754 /*
755  * This function prepares the status for parsing of level 1 elements.
756  */
758  uint32_t id, int64_t position)
759 {
760  if (position >= 0) {
761  int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
762  if (err < 0)
763  return err;
764  }
765 
766  matroska->current_id = id;
767  matroska->num_levels = 1;
768  matroska->unknown_count = 0;
769  matroska->resync_pos = avio_tell(matroska->ctx->pb);
770  if (id)
771  matroska->resync_pos -= (av_log2(id) + 7) / 8;
772 
773  return 0;
774 }
775 
776 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
777 {
778  AVIOContext *pb = matroska->ctx->pb;
779  uint32_t id;
780 
781  /* Try to seek to the last position to resync from. If this doesn't work,
782  * we resync from the earliest position available: The start of the buffer. */
783  if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
784  av_log(matroska->ctx, AV_LOG_WARNING,
785  "Seek to desired resync point failed. Seeking to "
786  "earliest point available instead.\n");
787  avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
788  last_pos + 1), SEEK_SET);
789  }
790 
791  id = avio_rb32(pb);
792 
793  // try to find a toplevel element
794  while (!avio_feof(pb)) {
795  if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
796  id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
798  id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
799  /* Prepare the context for parsing of a level 1 element. */
800  matroska_reset_status(matroska, id, -1);
801  /* Given that we are here means that an error has occurred,
802  * so treat the segment as unknown length in order not to
803  * discard valid data that happens to be beyond the designated
804  * end of the segment. */
805  matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
806  return 0;
807  }
808  id = (id << 8) | avio_r8(pb);
809  }
810 
811  matroska->done = 1;
812  return pb->error ? pb->error : AVERROR_EOF;
813 }
814 
815 /*
816  * Read: an "EBML number", which is defined as a variable-length
817  * array of bytes. The first byte indicates the length by giving a
818  * number of 0-bits followed by a one. The position of the first
819  * "one" bit inside the first byte indicates the length of this
820  * number.
821  * Returns: number of bytes read, < 0 on error
822  */
824  int max_size, uint64_t *number, int eof_forbidden)
825 {
826  int read, n = 1;
827  uint64_t total;
828  int64_t pos;
829 
830  /* The first byte tells us the length in bytes - except when it is zero. */
831  total = avio_r8(pb);
832  if (pb->eof_reached)
833  goto err;
834 
835  /* get the length of the EBML number */
836  read = 8 - ff_log2_tab[total];
837 
838  if (!total || read > max_size) {
839  pos = avio_tell(pb) - 1;
840  if (!total) {
841  av_log(matroska->ctx, AV_LOG_ERROR,
842  "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
843  "of an EBML number\n", pos, pos);
844  } else {
845  av_log(matroska->ctx, AV_LOG_ERROR,
846  "Length %d indicated by an EBML number's first byte 0x%02x "
847  "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
848  read, (uint8_t) total, pos, pos, max_size);
849  }
850  return AVERROR_INVALIDDATA;
851  }
852 
853  /* read out length */
854  total ^= 1 << ff_log2_tab[total];
855  while (n++ < read)
856  total = (total << 8) | avio_r8(pb);
857 
858  if (pb->eof_reached) {
859  eof_forbidden = 1;
860  goto err;
861  }
862 
863  *number = total;
864 
865  return read;
866 
867 err:
868  pos = avio_tell(pb);
869  if (pb->error) {
870  av_log(matroska->ctx, AV_LOG_ERROR,
871  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
872  pos, pos);
873  return pb->error;
874  }
875  if (eof_forbidden) {
876  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
877  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
878  return AVERROR(EIO);
879  }
880  return AVERROR_EOF;
881 }
882 
883 /**
884  * Read a EBML length value.
885  * This needs special handling for the "unknown length" case which has multiple
886  * encodings.
887  */
889  uint64_t *number)
890 {
891  int res = ebml_read_num(matroska, pb, 8, number, 1);
892  if (res > 0 && *number + 1 == 1ULL << (7 * res))
893  *number = EBML_UNKNOWN_LENGTH;
894  return res;
895 }
896 
897 /*
898  * Read the next element as an unsigned int.
899  * Returns NEEDS_CHECKING.
900  */
901 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
902 {
903  int n = 0;
904 
905  /* big-endian ordering; build up number */
906  *num = 0;
907  while (n++ < size)
908  *num = (*num << 8) | avio_r8(pb);
909 
910  return NEEDS_CHECKING;
911 }
912 
913 /*
914  * Read the next element as a signed int.
915  * Returns NEEDS_CHECKING.
916  */
917 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
918 {
919  int n = 1;
920 
921  if (size == 0) {
922  *num = 0;
923  } else {
924  *num = sign_extend(avio_r8(pb), 8);
925 
926  /* big-endian ordering; build up number */
927  while (n++ < size)
928  *num = ((uint64_t)*num << 8) | avio_r8(pb);
929  }
930 
931  return NEEDS_CHECKING;
932 }
933 
934 /*
935  * Read the next element as a float.
936  * Returns NEEDS_CHECKING or < 0 on obvious failure.
937  */
938 static int ebml_read_float(AVIOContext *pb, int size, double *num)
939 {
940  if (size == 0)
941  *num = 0;
942  else if (size == 4)
943  *num = av_int2float(avio_rb32(pb));
944  else if (size == 8)
945  *num = av_int2double(avio_rb64(pb));
946  else
947  return AVERROR_INVALIDDATA;
948 
949  return NEEDS_CHECKING;
950 }
951 
952 /*
953  * Read the next element as an ASCII string.
954  * 0 is success, < 0 or NEEDS_CHECKING is failure.
955  */
956 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
957 {
958  char *res;
959  int ret;
960 
961  /* EBML strings are usually not 0-terminated, so we allocate one
962  * byte more, read the string and NULL-terminate it ourselves. */
963  if (!(res = av_malloc(size + 1)))
964  return AVERROR(ENOMEM);
965  if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
966  av_free(res);
967  return ret < 0 ? ret : NEEDS_CHECKING;
968  }
969  (res)[size] = '\0';
970  av_free(*str);
971  *str = res;
972 
973  return 0;
974 }
975 
976 /*
977  * Read the next element as binary data.
978  * 0 is success, < 0 or NEEDS_CHECKING is failure.
979  */
980 static int ebml_read_binary(AVIOContext *pb, int length,
981  int64_t pos, EbmlBin *bin)
982 {
983  int ret;
984 
985  ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
986  if (ret < 0)
987  return ret;
988  memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
989 
990  bin->data = bin->buf->data;
991  bin->size = length;
992  bin->pos = pos;
993  if ((ret = avio_read(pb, bin->data, length)) != length) {
994  av_buffer_unref(&bin->buf);
995  bin->data = NULL;
996  bin->size = 0;
997  return ret < 0 ? ret : NEEDS_CHECKING;
998  }
999 
1000  return 0;
1001 }
1002 
1003 /*
1004  * Read the next element, but only the header. The contents
1005  * are supposed to be sub-elements which can be read separately.
1006  * 0 is success, < 0 is failure.
1007  */
1009  uint64_t length, int64_t pos)
1010 {
1012 
1013  if (matroska->num_levels >= EBML_MAX_DEPTH) {
1014  av_log(matroska->ctx, AV_LOG_ERROR,
1015  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1016  return AVERROR(ENOSYS);
1017  }
1018 
1019  level = &matroska->levels[matroska->num_levels++];
1020  level->start = pos;
1021  level->length = length;
1022 
1023  return 0;
1024 }
1025 
1026 /*
1027  * Read a signed "EBML number"
1028  * Return: number of bytes processed, < 0 on error
1029  */
1031  AVIOContext *pb, int64_t *num)
1032 {
1033  uint64_t unum;
1034  int res;
1035 
1036  /* read as unsigned number first */
1037  if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1038  return res;
1039 
1040  /* make signed (weird way) */
1041  *num = unum - ((1LL << (7 * res - 1)) - 1);
1042 
1043  return res;
1044 }
1045 
1046 static int ebml_parse(MatroskaDemuxContext *matroska,
1047  EbmlSyntax *syntax, void *data);
1048 
1049 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1050 {
1051  int i;
1052 
1053  // Whoever touches this should be aware of the duplication
1054  // existing in matroska_cluster_parsing.
1055  for (i = 0; syntax[i].id; i++)
1056  if (id == syntax[i].id)
1057  break;
1058 
1059  return &syntax[i];
1060 }
1061 
1062 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1063  void *data)
1064 {
1065  int res;
1066 
1067  if (data) {
1068  for (int i = 0; syntax[i].id; i++)
1069  switch (syntax[i].type) {
1070  case EBML_UINT:
1071  *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1072  break;
1073  case EBML_SINT:
1074  *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1075  break;
1076  case EBML_FLOAT:
1077  *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1078  break;
1079  case EBML_STR:
1080  case EBML_UTF8:
1081  // the default may be NULL
1082  if (syntax[i].def.s) {
1083  uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1084  *dst = av_strdup(syntax[i].def.s);
1085  if (!*dst)
1086  return AVERROR(ENOMEM);
1087  }
1088  break;
1089  }
1090 
1091  if (!matroska->levels[matroska->num_levels - 1].length) {
1092  matroska->num_levels--;
1093  return 0;
1094  }
1095  }
1096 
1097  do {
1098  res = ebml_parse(matroska, syntax, data);
1099  } while (!res);
1100 
1101  return res == LEVEL_ENDED ? 0 : res;
1102 }
1103 
1104 static int is_ebml_id_valid(uint32_t id)
1105 {
1106  // Due to endian nonsense in Matroska, the highest byte with any bits set
1107  // will contain the leading length bit. This bit in turn identifies the
1108  // total byte length of the element by its position within the byte.
1109  unsigned int bits = av_log2(id);
1110  return id && (bits + 7) / 8 == (8 - bits % 8);
1111 }
1112 
1113 /*
1114  * Allocate and return the entry for the level1 element with the given ID. If
1115  * an entry already exists, return the existing entry.
1116  */
1118  uint32_t id)
1119 {
1120  int i;
1121  MatroskaLevel1Element *elem;
1122 
1123  if (!is_ebml_id_valid(id))
1124  return NULL;
1125 
1126  // Some files link to all clusters; useless.
1127  if (id == MATROSKA_ID_CLUSTER)
1128  return NULL;
1129 
1130  // There can be multiple seekheads.
1131  if (id != MATROSKA_ID_SEEKHEAD) {
1132  for (i = 0; i < matroska->num_level1_elems; i++) {
1133  if (matroska->level1_elems[i].id == id)
1134  return &matroska->level1_elems[i];
1135  }
1136  }
1137 
1138  // Only a completely broken file would have more elements.
1139  // It also provides a low-effort way to escape from circular seekheads
1140  // (every iteration will add a level1 entry).
1141  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1142  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1143  return NULL;
1144  }
1145 
1146  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1147  *elem = (MatroskaLevel1Element){.id = id};
1148 
1149  return elem;
1150 }
1151 
1152 static int ebml_parse(MatroskaDemuxContext *matroska,
1153  EbmlSyntax *syntax, void *data)
1154 {
1155  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1156  // Forbid unknown-length EBML_NONE elements.
1158  [EBML_UINT] = 8,
1159  [EBML_SINT] = 8,
1160  [EBML_FLOAT] = 8,
1161  // max. 16 MB for strings
1162  [EBML_STR] = 0x1000000,
1163  [EBML_UTF8] = 0x1000000,
1164  // max. 256 MB for binary data
1165  [EBML_BIN] = 0x10000000,
1166  // no limits for anything else
1167  };
1168  AVIOContext *pb = matroska->ctx->pb;
1169  uint32_t id;
1170  uint64_t length;
1171  int64_t pos = avio_tell(pb), pos_alt;
1172  int res, update_pos = 1, level_check;
1173  MatroskaLevel1Element *level1_elem;
1174  MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1175 
1176  if (!matroska->current_id) {
1177  uint64_t id;
1178  res = ebml_read_num(matroska, pb, 4, &id, 0);
1179  if (res < 0) {
1180  if (pb->eof_reached && res == AVERROR_EOF) {
1181  if (matroska->is_live)
1182  // in live mode, finish parsing if EOF is reached.
1183  return 1;
1184  if (level && pos == avio_tell(pb)) {
1185  if (level->length == EBML_UNKNOWN_LENGTH) {
1186  // Unknown-length levels automatically end at EOF.
1187  matroska->num_levels--;
1188  return LEVEL_ENDED;
1189  } else {
1190  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1191  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1192  }
1193  }
1194  }
1195  return res;
1196  }
1197  matroska->current_id = id | 1 << 7 * res;
1198  pos_alt = pos + res;
1199  } else {
1200  pos_alt = pos;
1201  pos -= (av_log2(matroska->current_id) + 7) / 8;
1202  }
1203 
1204  id = matroska->current_id;
1205 
1206  syntax = ebml_parse_id(syntax, id);
1207  if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1208  if (level && level->length == EBML_UNKNOWN_LENGTH) {
1209  // Unknown-length levels end when an element from an upper level
1210  // in the hierarchy is encountered.
1211  while (syntax->def.n) {
1212  syntax = ebml_parse_id(syntax->def.n, id);
1213  if (syntax->id) {
1214  matroska->num_levels--;
1215  return LEVEL_ENDED;
1216  }
1217  };
1218  }
1219 
1220  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1221  "%"PRId64"\n", id, pos);
1222  update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1223  }
1224 
1225  if (data) {
1226  data = (char *) data + syntax->data_offset;
1227  if (syntax->list_elem_size) {
1228  EbmlList *list = data;
1229  void *newelem;
1230 
1231  if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1232  return AVERROR(ENOMEM);
1233  newelem = av_fast_realloc(list->elem,
1234  &list->alloc_elem_size,
1235  (list->nb_elem + 1) * syntax->list_elem_size);
1236  if (!newelem)
1237  return AVERROR(ENOMEM);
1238  list->elem = newelem;
1239  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1240  memset(data, 0, syntax->list_elem_size);
1241  list->nb_elem++;
1242  }
1243  }
1244 
1245  if (syntax->type != EBML_STOP) {
1246  matroska->current_id = 0;
1247  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1248  return res;
1249 
1250  pos_alt += res;
1251 
1252  if (matroska->num_levels > 0) {
1253  if (length != EBML_UNKNOWN_LENGTH &&
1254  level->length != EBML_UNKNOWN_LENGTH) {
1255  uint64_t elem_end = pos_alt + length,
1256  level_end = level->start + level->length;
1257 
1258  if (elem_end < level_end) {
1259  level_check = 0;
1260  } else if (elem_end == level_end) {
1261  level_check = LEVEL_ENDED;
1262  } else {
1263  av_log(matroska->ctx, AV_LOG_ERROR,
1264  "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1265  "containing master element ending at 0x%"PRIx64"\n",
1266  pos, elem_end, level_end);
1267  return AVERROR_INVALIDDATA;
1268  }
1269  } else if (length != EBML_UNKNOWN_LENGTH) {
1270  level_check = 0;
1271  } else if (level->length != EBML_UNKNOWN_LENGTH) {
1272  av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1273  "at 0x%"PRIx64" inside parent with finite size\n", pos);
1274  return AVERROR_INVALIDDATA;
1275  } else {
1276  level_check = 0;
1277  if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1278  || syntax->type == EBML_NEST)) {
1279  // According to the current specifications only clusters and
1280  // segments are allowed to be unknown-length. We also accept
1281  // other unknown-length master elements.
1282  av_log(matroska->ctx, AV_LOG_WARNING,
1283  "Found unknown-length element 0x%"PRIX32" other than "
1284  "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1285  "parsing will nevertheless be attempted.\n", id, pos);
1286  update_pos = -1;
1287  }
1288  }
1289  } else
1290  level_check = 0;
1291 
1292  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1293  if (length != EBML_UNKNOWN_LENGTH) {
1294  av_log(matroska->ctx, AV_LOG_ERROR,
1295  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1296  "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1297  length, max_lengths[syntax->type], id, pos);
1298  } else if (syntax->type != EBML_NONE) {
1299  av_log(matroska->ctx, AV_LOG_ERROR,
1300  "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1301  "unknown length, yet the length of an element of its "
1302  "type must be known.\n", id, pos);
1303  } else {
1304  av_log(matroska->ctx, AV_LOG_ERROR,
1305  "Found unknown-length element with ID 0x%"PRIX32" at "
1306  "pos. 0x%"PRIx64" for which no syntax for parsing is "
1307  "available.\n", id, pos);
1308  }
1309  return AVERROR_INVALIDDATA;
1310  }
1311 
1312  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1313  // Loosing sync will likely manifest itself as encountering unknown
1314  // elements which are not reliably distinguishable from elements
1315  // belonging to future extensions of the format.
1316  // We use a heuristic to detect such situations: If the current
1317  // element is not expected at the current syntax level and there
1318  // were only a few unknown elements in a row, then the element is
1319  // skipped or considered defective based upon the length of the
1320  // current element (i.e. how much would be skipped); if there were
1321  // more than a few skipped elements in a row and skipping the current
1322  // element would lead us more than SKIP_THRESHOLD away from the last
1323  // known good position, then it is inferred that an error occurred.
1324  // The dependency on the number of unknown elements in a row exists
1325  // because the distance to the last known good position is
1326  // automatically big if the last parsed element was big.
1327  // In both cases, each unknown element is considered equivalent to
1328  // UNKNOWN_EQUIV of skipped bytes for the check.
1329  // The whole check is only done for non-seekable output, because
1330  // in this situation skipped data can't simply be rechecked later.
1331  // This is especially important when using unkown length elements
1332  // as the check for whether a child exceeds its containing master
1333  // element is not effective in this situation.
1334  if (update_pos) {
1335  matroska->unknown_count = 0;
1336  } else {
1337  int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1338 
1339  if (matroska->unknown_count > 3)
1340  dist += pos_alt - matroska->resync_pos;
1341 
1342  if (dist > SKIP_THRESHOLD) {
1343  av_log(matroska->ctx, AV_LOG_ERROR,
1344  "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1345  "length 0x%"PRIx64" considered as invalid data. Last "
1346  "known good position 0x%"PRIx64", %d unknown elements"
1347  " in a row\n", id, pos, length, matroska->resync_pos,
1348  matroska->unknown_count);
1349  return AVERROR_INVALIDDATA;
1350  }
1351  }
1352  }
1353 
1354  if (update_pos > 0) {
1355  // We have found an element that is allowed at this place
1356  // in the hierarchy and it passed all checks, so treat the beginning
1357  // of the element as the "last known good" position.
1358  matroska->resync_pos = pos;
1359  }
1360 
1361  if (!data && length != EBML_UNKNOWN_LENGTH)
1362  goto skip;
1363  }
1364 
1365  switch (syntax->type) {
1366  case EBML_UINT:
1367  res = ebml_read_uint(pb, length, data);
1368  break;
1369  case EBML_SINT:
1370  res = ebml_read_sint(pb, length, data);
1371  break;
1372  case EBML_FLOAT:
1373  res = ebml_read_float(pb, length, data);
1374  break;
1375  case EBML_STR:
1376  case EBML_UTF8:
1377  res = ebml_read_ascii(pb, length, data);
1378  break;
1379  case EBML_BIN:
1380  res = ebml_read_binary(pb, length, pos_alt, data);
1381  break;
1382  case EBML_LEVEL1:
1383  case EBML_NEST:
1384  if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1385  return res;
1386  if (id == MATROSKA_ID_SEGMENT)
1387  matroska->segment_start = pos_alt;
1388  if (id == MATROSKA_ID_CUES)
1389  matroska->cues_parsing_deferred = 0;
1390  if (syntax->type == EBML_LEVEL1 &&
1391  (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1392  if (!level1_elem->pos) {
1393  // Zero is not a valid position for a level 1 element.
1394  level1_elem->pos = pos;
1395  } else if (level1_elem->pos != pos)
1396  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1397  level1_elem->parsed = 1;
1398  }
1399  if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1400  return res;
1401  break;
1402  case EBML_STOP:
1403  return 1;
1404  skip:
1405  default:
1406  if (length) {
1407  int64_t res2;
1408  if (ffio_limit(pb, length) != length) {
1409  // ffio_limit emits its own error message,
1410  // so we don't have to.
1411  return AVERROR(EIO);
1412  }
1413  if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1414  // avio_skip might take us past EOF. We check for this
1415  // by skipping only length - 1 bytes, reading a byte and
1416  // checking the error flags. This is done in order to check
1417  // that the element has been properly skipped even when
1418  // no filesize (that ffio_limit relies on) is available.
1419  avio_r8(pb);
1420  res = NEEDS_CHECKING;
1421  } else
1422  res = res2;
1423  } else
1424  res = 0;
1425  }
1426  if (res) {
1427  if (res == NEEDS_CHECKING) {
1428  if (pb->eof_reached) {
1429  if (pb->error)
1430  res = pb->error;
1431  else
1432  res = AVERROR_EOF;
1433  } else
1434  goto level_check;
1435  }
1436 
1437  if (res == AVERROR_INVALIDDATA)
1438  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1439  else if (res == AVERROR(EIO))
1440  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1441  else if (res == AVERROR_EOF) {
1442  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1443  res = AVERROR(EIO);
1444  }
1445 
1446  return res;
1447  }
1448 
1449 level_check:
1450  if (level_check == LEVEL_ENDED && matroska->num_levels) {
1451  level = &matroska->levels[matroska->num_levels - 1];
1452  pos = avio_tell(pb);
1453 
1454  // Given that pos >= level->start no check for
1455  // level->length != EBML_UNKNOWN_LENGTH is necessary.
1456  while (matroska->num_levels && pos == level->start + level->length) {
1457  matroska->num_levels--;
1458  level--;
1459  }
1460  }
1461 
1462  return level_check;
1463 }
1464 
1465 static void ebml_free(EbmlSyntax *syntax, void *data)
1466 {
1467  int i, j;
1468  for (i = 0; syntax[i].id; i++) {
1469  void *data_off = (char *) data + syntax[i].data_offset;
1470  switch (syntax[i].type) {
1471  case EBML_STR:
1472  case EBML_UTF8:
1473  av_freep(data_off);
1474  break;
1475  case EBML_BIN:
1476  av_buffer_unref(&((EbmlBin *) data_off)->buf);
1477  break;
1478  case EBML_LEVEL1:
1479  case EBML_NEST:
1480  if (syntax[i].list_elem_size) {
1481  EbmlList *list = data_off;
1482  char *ptr = list->elem;
1483  for (j = 0; j < list->nb_elem;
1484  j++, ptr += syntax[i].list_elem_size)
1485  ebml_free(syntax[i].def.n, ptr);
1486  av_freep(&list->elem);
1487  list->nb_elem = 0;
1488  list->alloc_elem_size = 0;
1489  } else
1490  ebml_free(syntax[i].def.n, data_off);
1491  default:
1492  break;
1493  }
1494  }
1495 }
1496 
1497 /*
1498  * Autodetecting...
1499  */
1500 static int matroska_probe(const AVProbeData *p)
1501 {
1502  uint64_t total = 0;
1503  int len_mask = 0x80, size = 1, n = 1, i;
1504 
1505  /* EBML header? */
1506  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1507  return 0;
1508 
1509  /* length of header */
1510  total = p->buf[4];
1511  while (size <= 8 && !(total & len_mask)) {
1512  size++;
1513  len_mask >>= 1;
1514  }
1515  if (size > 8)
1516  return 0;
1517  total &= (len_mask - 1);
1518  while (n < size)
1519  total = (total << 8) | p->buf[4 + n++];
1520 
1521  if (total + 1 == 1ULL << (7 * size)){
1522  /* Unknown-length header - simply parse the whole buffer. */
1523  total = p->buf_size - 4 - size;
1524  } else {
1525  /* Does the probe data contain the whole header? */
1526  if (p->buf_size < 4 + size + total)
1527  return 0;
1528  }
1529 
1530  /* The header should contain a known document type. For now,
1531  * we don't parse the whole header but simply check for the
1532  * availability of that array of characters inside the header.
1533  * Not fully fool-proof, but good enough. */
1534  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1535  size_t probelen = strlen(matroska_doctypes[i]);
1536  if (total < probelen)
1537  continue;
1538  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1539  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1540  return AVPROBE_SCORE_MAX;
1541  }
1542 
1543  // probably valid EBML header but no recognized doctype
1544  return AVPROBE_SCORE_EXTENSION;
1545 }
1546 
1548  int num)
1549 {
1550  MatroskaTrack *tracks = matroska->tracks.elem;
1551  int i;
1552 
1553  for (i = 0; i < matroska->tracks.nb_elem; i++)
1554  if (tracks[i].num == num)
1555  return &tracks[i];
1556 
1557  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1558  return NULL;
1559 }
1560 
1561 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1562  MatroskaTrack *track)
1563 {
1564  MatroskaTrackEncoding *encodings = track->encodings.elem;
1565  uint8_t *data = *buf;
1566  int isize = *buf_size;
1567  uint8_t *pkt_data = NULL;
1568  uint8_t av_unused *newpktdata;
1569  int pkt_size = isize;
1570  int result = 0;
1571  int olen;
1572 
1573  if (pkt_size >= 10000000U)
1574  return AVERROR_INVALIDDATA;
1575 
1576  switch (encodings[0].compression.algo) {
1578  {
1579  int header_size = encodings[0].compression.settings.size;
1580  uint8_t *header = encodings[0].compression.settings.data;
1581 
1582  if (header_size && !header) {
1583  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1584  return -1;
1585  }
1586 
1587  if (!header_size)
1588  return 0;
1589 
1590  pkt_size = isize + header_size;
1591  pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1592  if (!pkt_data)
1593  return AVERROR(ENOMEM);
1594 
1595  memcpy(pkt_data, header, header_size);
1596  memcpy(pkt_data + header_size, data, isize);
1597  break;
1598  }
1599 #if CONFIG_LZO
1601  do {
1602  int insize = isize;
1603  olen = pkt_size *= 3;
1604  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1606  if (!newpktdata) {
1607  result = AVERROR(ENOMEM);
1608  goto failed;
1609  }
1610  pkt_data = newpktdata;
1611  result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1612  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1613  if (result) {
1614  result = AVERROR_INVALIDDATA;
1615  goto failed;
1616  }
1617  pkt_size -= olen;
1618  break;
1619 #endif
1620 #if CONFIG_ZLIB
1622  {
1623  z_stream zstream = { 0 };
1624  if (inflateInit(&zstream) != Z_OK)
1625  return -1;
1626  zstream.next_in = data;
1627  zstream.avail_in = isize;
1628  do {
1629  pkt_size *= 3;
1630  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1631  if (!newpktdata) {
1632  inflateEnd(&zstream);
1633  result = AVERROR(ENOMEM);
1634  goto failed;
1635  }
1636  pkt_data = newpktdata;
1637  zstream.avail_out = pkt_size - zstream.total_out;
1638  zstream.next_out = pkt_data + zstream.total_out;
1639  result = inflate(&zstream, Z_NO_FLUSH);
1640  } while (result == Z_OK && pkt_size < 10000000);
1641  pkt_size = zstream.total_out;
1642  inflateEnd(&zstream);
1643  if (result != Z_STREAM_END) {
1644  if (result == Z_MEM_ERROR)
1645  result = AVERROR(ENOMEM);
1646  else
1647  result = AVERROR_INVALIDDATA;
1648  goto failed;
1649  }
1650  break;
1651  }
1652 #endif
1653 #if CONFIG_BZLIB
1655  {
1656  bz_stream bzstream = { 0 };
1657  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1658  return -1;
1659  bzstream.next_in = data;
1660  bzstream.avail_in = isize;
1661  do {
1662  pkt_size *= 3;
1663  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1664  if (!newpktdata) {
1665  BZ2_bzDecompressEnd(&bzstream);
1666  result = AVERROR(ENOMEM);
1667  goto failed;
1668  }
1669  pkt_data = newpktdata;
1670  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1671  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1672  result = BZ2_bzDecompress(&bzstream);
1673  } while (result == BZ_OK && pkt_size < 10000000);
1674  pkt_size = bzstream.total_out_lo32;
1675  BZ2_bzDecompressEnd(&bzstream);
1676  if (result != BZ_STREAM_END) {
1677  if (result == BZ_MEM_ERROR)
1678  result = AVERROR(ENOMEM);
1679  else
1680  result = AVERROR_INVALIDDATA;
1681  goto failed;
1682  }
1683  break;
1684  }
1685 #endif
1686  default:
1687  return AVERROR_INVALIDDATA;
1688  }
1689 
1690  memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1691 
1692  *buf = pkt_data;
1693  *buf_size = pkt_size;
1694  return 0;
1695 
1696 failed:
1697  av_free(pkt_data);
1698  return result;
1699 }
1700 
1702  AVDictionary **metadata, char *prefix)
1703 {
1704  MatroskaTag *tags = list->elem;
1705  char key[1024];
1706  int i;
1707 
1708  for (i = 0; i < list->nb_elem; i++) {
1709  const char *lang = tags[i].lang &&
1710  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1711 
1712  if (!tags[i].name) {
1713  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1714  continue;
1715  }
1716  if (prefix)
1717  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1718  else
1719  av_strlcpy(key, tags[i].name, sizeof(key));
1720  if (tags[i].def || !lang) {
1721  av_dict_set(metadata, key, tags[i].string, 0);
1722  if (tags[i].sub.nb_elem)
1723  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1724  }
1725  if (lang) {
1726  av_strlcat(key, "-", sizeof(key));
1727  av_strlcat(key, lang, sizeof(key));
1728  av_dict_set(metadata, key, tags[i].string, 0);
1729  if (tags[i].sub.nb_elem)
1730  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1731  }
1732  }
1734 }
1735 
1737 {
1738  MatroskaDemuxContext *matroska = s->priv_data;
1739  MatroskaTags *tags = matroska->tags.elem;
1740  int i, j;
1741 
1742  for (i = 0; i < matroska->tags.nb_elem; i++) {
1743  if (tags[i].target.attachuid) {
1744  MatroskaAttachment *attachment = matroska->attachments.elem;
1745  int found = 0;
1746  for (j = 0; j < matroska->attachments.nb_elem; j++) {
1747  if (attachment[j].uid == tags[i].target.attachuid &&
1748  attachment[j].stream) {
1749  matroska_convert_tag(s, &tags[i].tag,
1750  &attachment[j].stream->metadata, NULL);
1751  found = 1;
1752  }
1753  }
1754  if (!found) {
1756  "The tags at index %d refer to a "
1757  "non-existent attachment %"PRId64".\n",
1758  i, tags[i].target.attachuid);
1759  }
1760  } else if (tags[i].target.chapteruid) {
1761  MatroskaChapter *chapter = matroska->chapters.elem;
1762  int found = 0;
1763  for (j = 0; j < matroska->chapters.nb_elem; j++) {
1764  if (chapter[j].uid == tags[i].target.chapteruid &&
1765  chapter[j].chapter) {
1766  matroska_convert_tag(s, &tags[i].tag,
1767  &chapter[j].chapter->metadata, NULL);
1768  found = 1;
1769  }
1770  }
1771  if (!found) {
1773  "The tags at index %d refer to a non-existent chapter "
1774  "%"PRId64".\n",
1775  i, tags[i].target.chapteruid);
1776  }
1777  } else if (tags[i].target.trackuid) {
1778  MatroskaTrack *track = matroska->tracks.elem;
1779  int found = 0;
1780  for (j = 0; j < matroska->tracks.nb_elem; j++) {
1781  if (track[j].uid == tags[i].target.trackuid &&
1782  track[j].stream) {
1783  matroska_convert_tag(s, &tags[i].tag,
1784  &track[j].stream->metadata, NULL);
1785  found = 1;
1786  }
1787  }
1788  if (!found) {
1790  "The tags at index %d refer to a non-existent track "
1791  "%"PRId64".\n",
1792  i, tags[i].target.trackuid);
1793  }
1794  } else {
1795  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1796  tags[i].target.type);
1797  }
1798  }
1799 }
1800 
1802  int64_t pos)
1803 {
1804  uint32_t saved_id = matroska->current_id;
1805  int64_t before_pos = avio_tell(matroska->ctx->pb);
1806  int ret = 0;
1807 
1808  /* seek */
1809  if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1810  /* We don't want to lose our seekhead level, so we add
1811  * a dummy. This is a crude hack. */
1812  if (matroska->num_levels == EBML_MAX_DEPTH) {
1813  av_log(matroska->ctx, AV_LOG_INFO,
1814  "Max EBML element depth (%d) reached, "
1815  "cannot parse further.\n", EBML_MAX_DEPTH);
1816  ret = AVERROR_INVALIDDATA;
1817  } else {
1818  matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1819  matroska->num_levels++;
1820  matroska->current_id = 0;
1821 
1822  ret = ebml_parse(matroska, matroska_segment, matroska);
1823  if (ret == LEVEL_ENDED) {
1824  /* This can only happen if the seek brought us beyond EOF. */
1825  ret = AVERROR_EOF;
1826  }
1827  }
1828  }
1829  /* Seek back - notice that in all instances where this is used
1830  * it is safe to set the level to 1. */
1831  matroska_reset_status(matroska, saved_id, before_pos);
1832 
1833  return ret;
1834 }
1835 
1837 {
1838  EbmlList *seekhead_list = &matroska->seekhead;
1839  int i;
1840 
1841  // we should not do any seeking in the streaming case
1842  if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1843  return;
1844 
1845  for (i = 0; i < seekhead_list->nb_elem; i++) {
1846  MatroskaSeekhead *seekheads = seekhead_list->elem;
1847  uint32_t id = seekheads[i].id;
1848  int64_t pos = seekheads[i].pos + matroska->segment_start;
1849 
1850  MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1851  if (!elem || elem->parsed)
1852  continue;
1853 
1854  elem->pos = pos;
1855 
1856  // defer cues parsing until we actually need cue data.
1857  if (id == MATROSKA_ID_CUES)
1858  continue;
1859 
1860  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1861  // mark index as broken
1862  matroska->cues_parsing_deferred = -1;
1863  break;
1864  }
1865 
1866  elem->parsed = 1;
1867  }
1868 }
1869 
1871 {
1872  EbmlList *index_list;
1874  uint64_t index_scale = 1;
1875  int i, j;
1876 
1877  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1878  return;
1879 
1880  index_list = &matroska->index;
1881  index = index_list->elem;
1882  if (index_list->nb_elem < 2)
1883  return;
1884  if (index[1].time > 1E14 / matroska->time_scale) {
1885  av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1886  return;
1887  }
1888  for (i = 0; i < index_list->nb_elem; i++) {
1889  EbmlList *pos_list = &index[i].pos;
1890  MatroskaIndexPos *pos = pos_list->elem;
1891  for (j = 0; j < pos_list->nb_elem; j++) {
1892  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1893  pos[j].track);
1894  if (track && track->stream)
1895  av_add_index_entry(track->stream,
1896  pos[j].pos + matroska->segment_start,
1897  index[i].time / index_scale, 0, 0,
1899  }
1900  }
1901 }
1902 
1904  int i;
1905 
1906  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1907  return;
1908 
1909  for (i = 0; i < matroska->num_level1_elems; i++) {
1910  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1911  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1912  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1913  matroska->cues_parsing_deferred = -1;
1914  elem->parsed = 1;
1915  break;
1916  }
1917  }
1918 
1919  matroska_add_index_entries(matroska);
1920 }
1921 
1923 {
1924  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1925  int profile;
1926 
1927  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1928  if (strstr(codec_id, aac_profiles[profile]))
1929  break;
1930  return profile + 1;
1931 }
1932 
1933 static int matroska_aac_sri(int samplerate)
1934 {
1935  int sri;
1936 
1937  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1938  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1939  break;
1940  return sri;
1941 }
1942 
1943 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1944 {
1945  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1946  avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1947 }
1948 
1950  MatroskaTrack *track,
1951  int *offset)
1952 {
1953  AVStream *st = track->stream;
1954  uint8_t *p = track->codec_priv.data;
1955  int size = track->codec_priv.size;
1956 
1957  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1958  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1959  track->codec_priv.size = 0;
1960  return 0;
1961  }
1962  *offset = 8;
1963  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1964 
1965  p += track->codec_priv.size;
1966  size -= track->codec_priv.size;
1967 
1968  /* parse the remaining metadata blocks if present */
1969  while (size >= 4) {
1970  int block_last, block_type, block_size;
1971 
1972  flac_parse_block_header(p, &block_last, &block_type, &block_size);
1973 
1974  p += 4;
1975  size -= 4;
1976  if (block_size > size)
1977  return 0;
1978 
1979  /* check for the channel mask */
1980  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1981  AVDictionary *dict = NULL;
1982  AVDictionaryEntry *chmask;
1983 
1984  ff_vorbis_comment(s, &dict, p, block_size, 0);
1985  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1986  if (chmask) {
1987  uint64_t mask = strtol(chmask->value, NULL, 0);
1988  if (!mask || mask & ~0x3ffffULL) {
1990  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1991  } else
1992  st->codecpar->channel_layout = mask;
1993  }
1994  av_dict_free(&dict);
1995  }
1996 
1997  p += block_size;
1998  size -= block_size;
1999  }
2000 
2001  return 0;
2002 }
2003 
2004 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2005 {
2006  int major, minor, micro, bttb = 0;
2007 
2008  /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2009  * this function, and fixed in 57.52 */
2010  if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, &micro) == 3)
2011  bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
2012 
2013  switch (field_order) {
2015  return AV_FIELD_PROGRESSIVE;
2017  return AV_FIELD_UNKNOWN;
2019  return AV_FIELD_TT;
2021  return AV_FIELD_BB;
2023  return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2025  return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2026  default:
2027  return AV_FIELD_UNKNOWN;
2028  }
2029 }
2030 
2031 static void mkv_stereo_mode_display_mul(int stereo_mode,
2032  int *h_width, int *h_height)
2033 {
2034  switch (stereo_mode) {
2040  break;
2045  *h_width = 2;
2046  break;
2051  *h_height = 2;
2052  break;
2053  }
2054 }
2055 
2056 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2057  const MatroskaTrackVideoColor *color = track->video.color.elem;
2058  const MatroskaMasteringMeta *mastering_meta;
2059  int has_mastering_primaries, has_mastering_luminance;
2060 
2061  if (!track->video.color.nb_elem)
2062  return 0;
2063 
2064  mastering_meta = &color->mastering_meta;
2065  // Mastering primaries are CIE 1931 coords, and must be > 0.
2066  has_mastering_primaries =
2067  mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2068  mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2069  mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2070  mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2071  has_mastering_luminance = mastering_meta->max_luminance > 0;
2072 
2075  if (color->primaries != AVCOL_PRI_RESERVED &&
2076  color->primaries != AVCOL_PRI_RESERVED0)
2077  st->codecpar->color_primaries = color->primaries;
2081  if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2082  color->range <= AVCOL_RANGE_JPEG)
2083  st->codecpar->color_range = color->range;
2088  st->codecpar->chroma_location =
2090  (color->chroma_siting_vert - 1) << 7);
2091  }
2092  if (color->max_cll && color->max_fall) {
2093  size_t size = 0;
2094  int ret;
2096  if (!metadata)
2097  return AVERROR(ENOMEM);
2099  (uint8_t *)metadata, size);
2100  if (ret < 0) {
2101  av_freep(&metadata);
2102  return ret;
2103  }
2104  metadata->MaxCLL = color->max_cll;
2105  metadata->MaxFALL = color->max_fall;
2106  }
2107 
2108  if (has_mastering_primaries || has_mastering_luminance) {
2109  AVMasteringDisplayMetadata *metadata =
2112  sizeof(AVMasteringDisplayMetadata));
2113  if (!metadata) {
2114  return AVERROR(ENOMEM);
2115  }
2116  memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2117  if (has_mastering_primaries) {
2118  metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2119  metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2120  metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2121  metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2122  metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2123  metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2124  metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2125  metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2126  metadata->has_primaries = 1;
2127  }
2128  if (has_mastering_luminance) {
2129  metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2130  metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2131  metadata->has_luminance = 1;
2132  }
2133  }
2134  return 0;
2135 }
2136 
2137 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track) {
2138  AVSphericalMapping *spherical;
2139  enum AVSphericalProjection projection;
2140  size_t spherical_size;
2141  uint32_t l = 0, t = 0, r = 0, b = 0;
2142  uint32_t padding = 0;
2143  int ret;
2144  GetByteContext gb;
2145 
2147  track->video.projection.private.size);
2148 
2149  if (bytestream2_get_byte(&gb) != 0) {
2150  av_log(NULL, AV_LOG_WARNING, "Unknown spherical metadata\n");
2151  return 0;
2152  }
2153 
2154  bytestream2_skip(&gb, 3); // flags
2155 
2156  switch (track->video.projection.type) {
2158  if (track->video.projection.private.size == 20) {
2159  t = bytestream2_get_be32(&gb);
2160  b = bytestream2_get_be32(&gb);
2161  l = bytestream2_get_be32(&gb);
2162  r = bytestream2_get_be32(&gb);
2163 
2164  if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2166  "Invalid bounding rectangle coordinates "
2167  "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2168  l, t, r, b);
2169  return AVERROR_INVALIDDATA;
2170  }
2171  } else if (track->video.projection.private.size != 0) {
2172  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2173  return AVERROR_INVALIDDATA;
2174  }
2175 
2176  if (l || t || r || b)
2177  projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2178  else
2179  projection = AV_SPHERICAL_EQUIRECTANGULAR;
2180  break;
2182  if (track->video.projection.private.size < 4) {
2183  av_log(NULL, AV_LOG_ERROR, "Missing projection private properties\n");
2184  return AVERROR_INVALIDDATA;
2185  } else if (track->video.projection.private.size == 12) {
2186  uint32_t layout = bytestream2_get_be32(&gb);
2187  if (layout) {
2189  "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2190  return 0;
2191  }
2192  projection = AV_SPHERICAL_CUBEMAP;
2193  padding = bytestream2_get_be32(&gb);
2194  } else {
2195  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2196  return AVERROR_INVALIDDATA;
2197  }
2198  break;
2200  /* No Spherical metadata */
2201  return 0;
2202  default:
2204  "Unknown spherical metadata type %"PRIu64"\n",
2205  track->video.projection.type);
2206  return 0;
2207  }
2208 
2209  spherical = av_spherical_alloc(&spherical_size);
2210  if (!spherical)
2211  return AVERROR(ENOMEM);
2212 
2213  spherical->projection = projection;
2214 
2215  spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2216  spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2217  spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2218 
2219  spherical->padding = padding;
2220 
2221  spherical->bound_left = l;
2222  spherical->bound_top = t;
2223  spherical->bound_right = r;
2224  spherical->bound_bottom = b;
2225 
2226  ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2227  spherical_size);
2228  if (ret < 0) {
2229  av_freep(&spherical);
2230  return ret;
2231  }
2232 
2233  return 0;
2234 }
2235 
2236 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2237 {
2238  const AVCodecTag *codec_tags;
2239 
2240  codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2242 
2243  /* Normalize noncompliant private data that starts with the fourcc
2244  * by expanding/shifting the data by 4 bytes and storing the data
2245  * size at the start. */
2246  if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2247  int ret = av_buffer_realloc(&track->codec_priv.buf,
2249  if (ret < 0)
2250  return ret;
2251 
2252  track->codec_priv.data = track->codec_priv.buf->data;
2253  memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2254  track->codec_priv.size += 4;
2255  AV_WB32(track->codec_priv.data, track->codec_priv.size);
2256  }
2257 
2258  *fourcc = AV_RL32(track->codec_priv.data + 4);
2259  *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2260 
2261  return 0;
2262 }
2263 
2265 {
2266  MatroskaDemuxContext *matroska = s->priv_data;
2267  MatroskaTrack *tracks = matroska->tracks.elem;
2268  AVStream *st;
2269  int i, j, ret;
2270  int k;
2271 
2272  for (i = 0; i < matroska->tracks.nb_elem; i++) {
2273  MatroskaTrack *track = &tracks[i];
2275  EbmlList *encodings_list = &track->encodings;
2276  MatroskaTrackEncoding *encodings = encodings_list->elem;
2277  uint8_t *extradata = NULL;
2278  int extradata_size = 0;
2279  int extradata_offset = 0;
2280  uint32_t fourcc = 0;
2281  AVIOContext b;
2282  char* key_id_base64 = NULL;
2283  int bit_depth = -1;
2284 
2285  /* Apply some sanity checks. */
2286  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2287  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2288  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2289  track->type != MATROSKA_TRACK_TYPE_METADATA) {
2290  av_log(matroska->ctx, AV_LOG_INFO,
2291  "Unknown or unsupported track type %"PRIu64"\n",
2292  track->type);
2293  continue;
2294  }
2295  if (!track->codec_id)
2296  continue;
2297 
2298  if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2299  isnan(track->audio.samplerate)) {
2300  av_log(matroska->ctx, AV_LOG_WARNING,
2301  "Invalid sample rate %f, defaulting to 8000 instead.\n",
2302  track->audio.samplerate);
2303  track->audio.samplerate = 8000;
2304  }
2305 
2306  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2307  if (!track->default_duration && track->video.frame_rate > 0) {
2308  double default_duration = 1000000000 / track->video.frame_rate;
2309  if (default_duration > UINT64_MAX || default_duration < 0) {
2310  av_log(matroska->ctx, AV_LOG_WARNING,
2311  "Invalid frame rate %e. Cannot calculate default duration.\n",
2312  track->video.frame_rate);
2313  } else {
2314  track->default_duration = default_duration;
2315  }
2316  }
2317  if (track->video.display_width == -1)
2318  track->video.display_width = track->video.pixel_width;
2319  if (track->video.display_height == -1)
2320  track->video.display_height = track->video.pixel_height;
2321  if (track->video.color_space.size == 4)
2322  fourcc = AV_RL32(track->video.color_space.data);
2323  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2324  if (!track->audio.out_samplerate)
2325  track->audio.out_samplerate = track->audio.samplerate;
2326  }
2327  if (encodings_list->nb_elem > 1) {
2328  av_log(matroska->ctx, AV_LOG_ERROR,
2329  "Multiple combined encodings not supported");
2330  } else if (encodings_list->nb_elem == 1) {
2331  if (encodings[0].type) {
2332  if (encodings[0].encryption.key_id.size > 0) {
2333  /* Save the encryption key id to be stored later as a
2334  metadata tag. */
2335  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2336  key_id_base64 = av_malloc(b64_size);
2337  if (key_id_base64 == NULL)
2338  return AVERROR(ENOMEM);
2339 
2340  av_base64_encode(key_id_base64, b64_size,
2341  encodings[0].encryption.key_id.data,
2342  encodings[0].encryption.key_id.size);
2343  } else {
2344  encodings[0].scope = 0;
2345  av_log(matroska->ctx, AV_LOG_ERROR,
2346  "Unsupported encoding type");
2347  }
2348  } else if (
2349 #if CONFIG_ZLIB
2350  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2351 #endif
2352 #if CONFIG_BZLIB
2354 #endif
2355 #if CONFIG_LZO
2357 #endif
2359  encodings[0].scope = 0;
2360  av_log(matroska->ctx, AV_LOG_ERROR,
2361  "Unsupported encoding type");
2362  } else if (track->codec_priv.size && encodings[0].scope & 2) {
2363  uint8_t *codec_priv = track->codec_priv.data;
2364  int ret = matroska_decode_buffer(&track->codec_priv.data,
2365  &track->codec_priv.size,
2366  track);
2367  if (ret < 0) {
2368  track->codec_priv.data = NULL;
2369  track->codec_priv.size = 0;
2370  av_log(matroska->ctx, AV_LOG_ERROR,
2371  "Failed to decode codec private data\n");
2372  }
2373 
2374  if (codec_priv != track->codec_priv.data) {
2375  av_buffer_unref(&track->codec_priv.buf);
2376  if (track->codec_priv.data) {
2377  track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2379  NULL, NULL, 0);
2380  if (!track->codec_priv.buf) {
2381  av_freep(&track->codec_priv.data);
2382  track->codec_priv.size = 0;
2383  return AVERROR(ENOMEM);
2384  }
2385  }
2386  }
2387  }
2388  }
2389 
2390  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2391  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2392  strlen(ff_mkv_codec_tags[j].str))) {
2393  codec_id = ff_mkv_codec_tags[j].id;
2394  break;
2395  }
2396  }
2397 
2398  st = track->stream = avformat_new_stream(s, NULL);
2399  if (!st) {
2400  av_free(key_id_base64);
2401  return AVERROR(ENOMEM);
2402  }
2403 
2404  if (key_id_base64) {
2405  /* export encryption key id as base64 metadata tag */
2406  av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2408  }
2409 
2410  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2411  track->codec_priv.size >= 40 &&
2412  track->codec_priv.data) {
2413  track->ms_compat = 1;
2414  bit_depth = AV_RL16(track->codec_priv.data + 14);
2415  fourcc = AV_RL32(track->codec_priv.data + 16);
2417  fourcc);
2418  if (!codec_id)
2420  fourcc);
2421  extradata_offset = 40;
2422  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2423  track->codec_priv.size >= 14 &&
2424  track->codec_priv.data) {
2425  int ret;
2426  ffio_init_context(&b, track->codec_priv.data,
2427  track->codec_priv.size,
2428  0, NULL, NULL, NULL, NULL);
2429  ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2430  if (ret < 0)
2431  return ret;
2432  codec_id = st->codecpar->codec_id;
2433  fourcc = st->codecpar->codec_tag;
2434  extradata_offset = FFMIN(track->codec_priv.size, 18);
2435  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2436  /* Normally 36, but allow noncompliant private data */
2437  && (track->codec_priv.size >= 32)
2438  && (track->codec_priv.data)) {
2439  uint16_t sample_size;
2440  int ret = get_qt_codec(track, &fourcc, &codec_id);
2441  if (ret < 0)
2442  return ret;
2443  sample_size = AV_RB16(track->codec_priv.data + 26);
2444  if (fourcc == 0) {
2445  if (sample_size == 8) {
2446  fourcc = MKTAG('r','a','w',' ');
2447  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2448  } else if (sample_size == 16) {
2449  fourcc = MKTAG('t','w','o','s');
2450  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2451  }
2452  }
2453  if ((fourcc == MKTAG('t','w','o','s') ||
2454  fourcc == MKTAG('s','o','w','t')) &&
2455  sample_size == 8)
2456  codec_id = AV_CODEC_ID_PCM_S8;
2457  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2458  (track->codec_priv.size >= 21) &&
2459  (track->codec_priv.data)) {
2460  int ret = get_qt_codec(track, &fourcc, &codec_id);
2461  if (ret < 0)
2462  return ret;
2463  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2464  fourcc = MKTAG('S','V','Q','3');
2465  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2466  }
2467  if (codec_id == AV_CODEC_ID_NONE)
2468  av_log(matroska->ctx, AV_LOG_ERROR,
2469  "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2470  if (track->codec_priv.size >= 86) {
2471  bit_depth = AV_RB16(track->codec_priv.data + 82);
2472  ffio_init_context(&b, track->codec_priv.data,
2473  track->codec_priv.size,
2474  0, NULL, NULL, NULL, NULL);
2475  if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2476  bit_depth &= 0x1F;
2477  track->has_palette = 1;
2478  }
2479  }
2480  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2481  switch (track->audio.bitdepth) {
2482  case 8:
2483  codec_id = AV_CODEC_ID_PCM_U8;
2484  break;
2485  case 24:
2486  codec_id = AV_CODEC_ID_PCM_S24BE;
2487  break;
2488  case 32:
2489  codec_id = AV_CODEC_ID_PCM_S32BE;
2490  break;
2491  }
2492  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2493  switch (track->audio.bitdepth) {
2494  case 8:
2495  codec_id = AV_CODEC_ID_PCM_U8;
2496  break;
2497  case 24:
2498  codec_id = AV_CODEC_ID_PCM_S24LE;
2499  break;
2500  case 32:
2501  codec_id = AV_CODEC_ID_PCM_S32LE;
2502  break;
2503  }
2504  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2505  track->audio.bitdepth == 64) {
2506  codec_id = AV_CODEC_ID_PCM_F64LE;
2507  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2508  int profile = matroska_aac_profile(track->codec_id);
2509  int sri = matroska_aac_sri(track->audio.samplerate);
2510  extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2511  if (!extradata)
2512  return AVERROR(ENOMEM);
2513  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2514  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2515  if (strstr(track->codec_id, "SBR")) {
2516  sri = matroska_aac_sri(track->audio.out_samplerate);
2517  extradata[2] = 0x56;
2518  extradata[3] = 0xE5;
2519  extradata[4] = 0x80 | (sri << 3);
2520  extradata_size = 5;
2521  } else
2522  extradata_size = 2;
2523  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2524  /* Only ALAC's magic cookie is stored in Matroska's track headers.
2525  * Create the "atom size", "tag", and "tag version" fields the
2526  * decoder expects manually. */
2527  extradata_size = 12 + track->codec_priv.size;
2528  extradata = av_mallocz(extradata_size +
2530  if (!extradata)
2531  return AVERROR(ENOMEM);
2532  AV_WB32(extradata, extradata_size);
2533  memcpy(&extradata[4], "alac", 4);
2534  AV_WB32(&extradata[8], 0);
2535  memcpy(&extradata[12], track->codec_priv.data,
2536  track->codec_priv.size);
2537  } else if (codec_id == AV_CODEC_ID_TTA) {
2538  uint8_t *ptr;
2539  if (track->audio.channels > UINT16_MAX ||
2540  track->audio.bitdepth > UINT16_MAX) {
2541  av_log(matroska->ctx, AV_LOG_WARNING,
2542  "Too large audio channel number %"PRIu64
2543  " or bitdepth %"PRIu64". Skipping track.\n",
2544  track->audio.channels, track->audio.bitdepth);
2545  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2546  return AVERROR_INVALIDDATA;
2547  else
2548  continue;
2549  }
2550  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2551  return AVERROR_INVALIDDATA;
2552  extradata_size = 22;
2553  extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2554  if (!extradata)
2555  return AVERROR(ENOMEM);
2556  ptr = extradata;
2557  bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2558  bytestream_put_le16(&ptr, 1);
2559  bytestream_put_le16(&ptr, track->audio.channels);
2560  bytestream_put_le16(&ptr, track->audio.bitdepth);
2561  bytestream_put_le32(&ptr, track->audio.out_samplerate);
2562  bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2563  track->audio.out_samplerate,
2564  AV_TIME_BASE * 1000));
2565  } else if (codec_id == AV_CODEC_ID_RV10 ||
2566  codec_id == AV_CODEC_ID_RV20 ||
2567  codec_id == AV_CODEC_ID_RV30 ||
2568  codec_id == AV_CODEC_ID_RV40) {
2569  extradata_offset = 26;
2570  } else if (codec_id == AV_CODEC_ID_RA_144) {
2571  track->audio.out_samplerate = 8000;
2572  track->audio.channels = 1;
2573  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2574  codec_id == AV_CODEC_ID_COOK ||
2575  codec_id == AV_CODEC_ID_ATRAC3 ||
2576  codec_id == AV_CODEC_ID_SIPR)
2577  && track->codec_priv.data) {
2578  int flavor;
2579 
2580  ffio_init_context(&b, track->codec_priv.data,
2581  track->codec_priv.size,
2582  0, NULL, NULL, NULL, NULL);
2583  avio_skip(&b, 22);
2584  flavor = avio_rb16(&b);
2585  track->audio.coded_framesize = avio_rb32(&b);
2586  avio_skip(&b, 12);
2587  track->audio.sub_packet_h = avio_rb16(&b);
2588  track->audio.frame_size = avio_rb16(&b);
2589  track->audio.sub_packet_size = avio_rb16(&b);
2590  if (flavor < 0 ||
2591  track->audio.coded_framesize <= 0 ||
2592  track->audio.sub_packet_h <= 0 ||
2593  track->audio.frame_size <= 0 ||
2594  track->audio.sub_packet_size <= 0 && codec_id != AV_CODEC_ID_SIPR)
2595  return AVERROR_INVALIDDATA;
2596  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2597  track->audio.frame_size);
2598  if (!track->audio.buf)
2599  return AVERROR(ENOMEM);
2600  if (codec_id == AV_CODEC_ID_RA_288) {
2601  st->codecpar->block_align = track->audio.coded_framesize;
2602  track->codec_priv.size = 0;
2603  } else {
2604  if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2605  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2606  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2607  st->codecpar->bit_rate = sipr_bit_rate[flavor];
2608  }
2609  st->codecpar->block_align = track->audio.sub_packet_size;
2610  extradata_offset = 78;
2611  }
2612  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2613  ret = matroska_parse_flac(s, track, &extradata_offset);
2614  if (ret < 0)
2615  return ret;
2616  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2617  fourcc = AV_RL32(track->codec_priv.data);
2618  } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2619  /* we don't need any value stored in CodecPrivate.
2620  make sure that it's not exported as extradata. */
2621  track->codec_priv.size = 0;
2622  } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2623  /* For now, propagate only the OBUs, if any. Once libavcodec is
2624  updated to handle isobmff style extradata this can be removed. */
2625  extradata_offset = 4;
2626  }
2627  track->codec_priv.size -= extradata_offset;
2628 
2629  if (codec_id == AV_CODEC_ID_NONE)
2630  av_log(matroska->ctx, AV_LOG_INFO,
2631  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2632 
2633  if (track->time_scale < 0.01)
2634  track->time_scale = 1.0;
2635  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2636  1000 * 1000 * 1000); /* 64 bit pts in ns */
2637 
2638  /* convert the delay from ns to the track timebase */
2640  (AVRational){ 1, 1000000000 },
2641  st->time_base);
2642 
2643  st->codecpar->codec_id = codec_id;
2644 
2645  if (strcmp(track->language, "und"))
2646  av_dict_set(&st->metadata, "language", track->language, 0);
2647  av_dict_set(&st->metadata, "title", track->name, 0);
2648 
2649  if (track->flag_default)
2651  if (track->flag_forced)
2653 
2654  if (!st->codecpar->extradata) {
2655  if (extradata) {
2656  st->codecpar->extradata = extradata;
2657  st->codecpar->extradata_size = extradata_size;
2658  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2659  if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2660  return AVERROR(ENOMEM);
2661  memcpy(st->codecpar->extradata,
2662  track->codec_priv.data + extradata_offset,
2663  track->codec_priv.size);
2664  }
2665  }
2666 
2667  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2669  int display_width_mul = 1;
2670  int display_height_mul = 1;
2671 
2673  st->codecpar->codec_tag = fourcc;
2674  if (bit_depth >= 0)
2676  st->codecpar->width = track->video.pixel_width;
2677  st->codecpar->height = track->video.pixel_height;
2678 
2680  st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2683 
2685  mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2686 
2689  &st->sample_aspect_ratio.den,
2690  st->codecpar->height * track->video.display_width * display_width_mul,
2691  st->codecpar->width * track->video.display_height * display_height_mul,
2692  255);
2693  }
2694  if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2696 
2697  if (track->default_duration) {
2699  1000000000, track->default_duration, 30000);
2700 #if FF_API_R_FRAME_RATE
2701  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2702  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2703  st->r_frame_rate = st->avg_frame_rate;
2704 #endif
2705  }
2706 
2707  /* export stereo mode flag as metadata tag */
2709  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2710 
2711  /* export alpha mode flag as metadata tag */
2712  if (track->video.alpha_mode)
2713  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2714 
2715  /* if we have virtual track, mark the real tracks */
2716  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2717  char buf[32];
2718  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2719  continue;
2720  snprintf(buf, sizeof(buf), "%s_%d",
2721  ff_matroska_video_stereo_plane[planes[j].type], i);
2722  for (k=0; k < matroska->tracks.nb_elem; k++)
2723  if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2724  av_dict_set(&tracks[k].stream->metadata,
2725  "stereo_mode", buf, 0);
2726  break;
2727  }
2728  }
2729  // add stream level stereo3d side data if it is a supported format
2731  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2732  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2733  if (ret < 0)
2734  return ret;
2735  }
2736 
2737  ret = mkv_parse_video_color(st, track);
2738  if (ret < 0)
2739  return ret;
2740  ret = mkv_parse_video_projection(st, track);
2741  if (ret < 0)
2742  return ret;
2743  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2745  st->codecpar->codec_tag = fourcc;
2746  st->codecpar->sample_rate = track->audio.out_samplerate;
2747  st->codecpar->channels = track->audio.channels;
2748  if (!st->codecpar->bits_per_coded_sample)
2750  if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2751  st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2754  else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2756  if (track->codec_delay > 0) {
2758  (AVRational){1, 1000000000},
2759  (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2760  48000 : st->codecpar->sample_rate});
2761  }
2762  if (track->seek_preroll > 0) {
2764  (AVRational){1, 1000000000},
2765  (AVRational){1, st->codecpar->sample_rate});
2766  }
2767  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2769 
2770  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2772  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2774  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2776  }
2777  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2779  }
2780  }
2781 
2782  return 0;
2783 }
2784 
2786 {
2787  MatroskaDemuxContext *matroska = s->priv_data;
2788  EbmlList *attachments_list = &matroska->attachments;
2789  EbmlList *chapters_list = &matroska->chapters;
2790  MatroskaAttachment *attachments;
2791  MatroskaChapter *chapters;
2792  uint64_t max_start = 0;
2793  int64_t pos;
2794  Ebml ebml = { 0 };
2795  int i, j, res;
2796 
2797  matroska->ctx = s;
2798  matroska->cues_parsing_deferred = 1;
2799 
2800  /* First read the EBML header. */
2801  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2802  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2803  ebml_free(ebml_syntax, &ebml);
2804  return AVERROR_INVALIDDATA;
2805  }
2806  if (ebml.version > EBML_VERSION ||
2807  ebml.max_size > sizeof(uint64_t) ||
2808  ebml.id_length > sizeof(uint32_t) ||
2809  ebml.doctype_version > 3) {
2811  "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2812  ebml.version, ebml.doctype, ebml.doctype_version);
2813  ebml_free(ebml_syntax, &ebml);
2814  return AVERROR_PATCHWELCOME;
2815  } else if (ebml.doctype_version == 3) {
2816  av_log(matroska->ctx, AV_LOG_WARNING,
2817  "EBML header using unsupported features\n"
2818  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2819  ebml.version, ebml.doctype, ebml.doctype_version);
2820  }
2821  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2822  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2823  break;
2824  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2825  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2826  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2827  ebml_free(ebml_syntax, &ebml);
2828  return AVERROR_INVALIDDATA;
2829  }
2830  }
2831  ebml_free(ebml_syntax, &ebml);
2832 
2833  /* The next thing is a segment. */
2834  pos = avio_tell(matroska->ctx->pb);
2835  res = ebml_parse(matroska, matroska_segments, matroska);
2836  // Try resyncing until we find an EBML_STOP type element.
2837  while (res != 1) {
2838  res = matroska_resync(matroska, pos);
2839  if (res < 0)
2840  goto fail;
2841  pos = avio_tell(matroska->ctx->pb);
2842  res = ebml_parse(matroska, matroska_segment, matroska);
2843  }
2844  /* Set data_offset as it might be needed later by seek_frame_generic. */
2845  if (matroska->current_id == MATROSKA_ID_CLUSTER)
2846  s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2847  matroska_execute_seekhead(matroska);
2848 
2849  if (!matroska->time_scale)
2850  matroska->time_scale = 1000000;
2851  if (matroska->duration)
2852  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2853  1000 / AV_TIME_BASE;
2854  av_dict_set(&s->metadata, "title", matroska->title, 0);
2855  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2856 
2857  if (matroska->date_utc.size == 8)
2859 
2860  res = matroska_parse_tracks(s);
2861  if (res < 0)
2862  goto fail;
2863 
2864  attachments = attachments_list->elem;
2865  for (j = 0; j < attachments_list->nb_elem; j++) {
2866  if (!(attachments[j].filename && attachments[j].mime &&
2867  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2868  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2869  } else {
2870  AVStream *st = avformat_new_stream(s, NULL);
2871  if (!st)
2872  break;
2873  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2874  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2876 
2877  for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2878  if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2879  strlen(ff_mkv_image_mime_tags[i].str))) {
2881  break;
2882  }
2883  }
2884 
2885  attachments[j].stream = st;
2886 
2887  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2888  AVPacket *pkt = &st->attached_pic;
2889 
2892 
2893  av_init_packet(pkt);
2894  pkt->buf = av_buffer_ref(attachments[j].bin.buf);
2895  if (!pkt->buf)
2896  return AVERROR(ENOMEM);
2897  pkt->data = attachments[j].bin.data;
2898  pkt->size = attachments[j].bin.size;
2899  pkt->stream_index = st->index;
2900  pkt->flags |= AV_PKT_FLAG_KEY;
2901  } else {
2903  if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2904  break;
2905  memcpy(st->codecpar->extradata, attachments[j].bin.data,
2906  attachments[j].bin.size);
2907 
2908  for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2909  if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2910  strlen(ff_mkv_mime_tags[i].str))) {
2912  break;
2913  }
2914  }
2915  }
2916  }
2917  }
2918 
2919  chapters = chapters_list->elem;
2920  for (i = 0; i < chapters_list->nb_elem; i++)
2921  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2922  (max_start == 0 || chapters[i].start > max_start)) {
2923  chapters[i].chapter =
2924  avpriv_new_chapter(s, chapters[i].uid,
2925  (AVRational) { 1, 1000000000 },
2926  chapters[i].start, chapters[i].end,
2927  chapters[i].title);
2928  if (chapters[i].chapter) {
2929  av_dict_set(&chapters[i].chapter->metadata,
2930  "title", chapters[i].title, 0);
2931  }
2932  max_start = chapters[i].start;
2933  }
2934 
2935  matroska_add_index_entries(matroska);
2936 
2938 
2939  return 0;
2940 fail:
2942  return res;
2943 }
2944 
2945 /*
2946  * Put one packet in an application-supplied AVPacket struct.
2947  * Returns 0 on success or -1 on failure.
2948  */
2950  AVPacket *pkt)
2951 {
2952  if (matroska->queue) {
2953  MatroskaTrack *tracks = matroska->tracks.elem;
2954  MatroskaTrack *track;
2955 
2956  ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2957  track = &tracks[pkt->stream_index];
2958  if (track->has_palette) {
2960  if (!pal) {
2961  av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
2962  } else {
2963  memcpy(pal, track->palette, AVPALETTE_SIZE);
2964  }
2965  track->has_palette = 0;
2966  }
2967  return 0;
2968  }
2969 
2970  return -1;
2971 }
2972 
2973 /*
2974  * Free all packets in our internal queue.
2975  */
2977 {
2978  ff_packet_list_free(&matroska->queue, &matroska->queue_end);
2979 }
2980 
2982  int size, int type, AVIOContext *pb,
2983  uint32_t lace_size[256], int *laces)
2984 {
2985  int n;
2986  uint8_t *data = *buf;
2987 
2988  if (!type) {
2989  *laces = 1;
2990  lace_size[0] = size;
2991  return 0;
2992  }
2993 
2994  av_assert0(size > 0);
2995  *laces = *data + 1;
2996  data += 1;
2997  size -= 1;
2998 
2999  switch (type) {
3000  case 0x1: /* Xiph lacing */
3001  {
3002  uint8_t temp;
3003  uint32_t total = 0;
3004  for (n = 0; n < *laces - 1; n++) {
3005  lace_size[n] = 0;
3006 
3007  while (1) {
3008  if (size <= total) {
3009  return AVERROR_INVALIDDATA;
3010  }
3011  temp = *data;
3012  total += temp;
3013  lace_size[n] += temp;
3014  data += 1;
3015  size -= 1;
3016  if (temp != 0xff)
3017  break;
3018  }
3019  }
3020  if (size <= total) {
3021  return AVERROR_INVALIDDATA;
3022  }
3023 
3024  lace_size[n] = size - total;
3025  break;
3026  }
3027 
3028  case 0x2: /* fixed-size lacing */
3029  if (size % (*laces)) {
3030  return AVERROR_INVALIDDATA;
3031  }
3032  for (n = 0; n < *laces; n++)
3033  lace_size[n] = size / *laces;
3034  break;
3035 
3036  case 0x3: /* EBML lacing */
3037  {
3038  uint64_t num;
3039  uint64_t total;
3040  int offset;
3041 
3042  avio_skip(pb, 4);
3043 
3044  n = ebml_read_num(matroska, pb, 8, &num, 1);
3045  if (n < 0)
3046  return n;
3047  if (num > INT_MAX)
3048  return AVERROR_INVALIDDATA;
3049 
3050  total = lace_size[0] = num;
3051  offset = n;
3052  for (n = 1; n < *laces - 1; n++) {
3053  int64_t snum;
3054  int r;
3055  r = matroska_ebmlnum_sint(matroska, pb, &snum);
3056  if (r < 0)
3057  return r;
3058  if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3059  return AVERROR_INVALIDDATA;
3060 
3061  lace_size[n] = lace_size[n - 1] + snum;
3062  total += lace_size[n];
3063  offset += r;
3064  }
3065  data += offset;
3066  size -= offset;
3067  if (size <= total) {
3068  return AVERROR_INVALIDDATA;
3069  }
3070  lace_size[*laces - 1] = size - total;
3071  break;
3072  }
3073  }
3074 
3075  *buf = data;
3076 
3077  return 0;
3078 }
3079 
3081  MatroskaTrack *track, AVStream *st,
3082  uint8_t *data, int size, uint64_t timecode,
3083  int64_t pos)
3084 {
3085  int a = st->codecpar->block_align;
3086  int sps = track->audio.sub_packet_size;
3087  int cfs = track->audio.coded_framesize;
3088  int h = track->audio.sub_packet_h;
3089  int y = track->audio.sub_packet_cnt;
3090  int w = track->audio.frame_size;
3091  int x;
3092 
3093  if (!track->audio.pkt_cnt) {
3094  if (track->audio.sub_packet_cnt == 0)
3095  track->audio.buf_timecode = timecode;
3096  if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3097  if (size < cfs * h / 2) {
3098  av_log(matroska->ctx, AV_LOG_ERROR,
3099  "Corrupt int4 RM-style audio packet size\n");
3100  return AVERROR_INVALIDDATA;
3101  }
3102  for (x = 0; x < h / 2; x++)
3103  memcpy(track->audio.buf + x * 2 * w + y * cfs,
3104  data + x * cfs, cfs);
3105  } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3106  if (size < w) {
3107  av_log(matroska->ctx, AV_LOG_ERROR,
3108  "Corrupt sipr RM-style audio packet size\n");
3109  return AVERROR_INVALIDDATA;
3110  }
3111  memcpy(track->audio.buf + y * w, data, w);
3112  } else {
3113  if (size < sps * w / sps || h<=0 || w%sps) {
3114  av_log(matroska->ctx, AV_LOG_ERROR,
3115  "Corrupt generic RM-style audio packet size\n");
3116  return AVERROR_INVALIDDATA;
3117  }
3118  for (x = 0; x < w / sps; x++)
3119  memcpy(track->audio.buf +
3120  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3121  data + x * sps, sps);
3122  }
3123 
3124  if (++track->audio.sub_packet_cnt >= h) {
3125  if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3126  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3127  track->audio.sub_packet_cnt = 0;
3128  track->audio.pkt_cnt = h * w / a;
3129  }
3130  }
3131 
3132  while (track->audio.pkt_cnt) {
3133  int ret;
3134  AVPacket pktl, *pkt = &pktl;
3135 
3136  ret = av_new_packet(pkt, a);
3137  if (ret < 0) {
3138  return ret;
3139  }
3140  memcpy(pkt->data,
3141  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3142  a);
3143  pkt->pts = track->audio.buf_timecode;
3145  pkt->pos = pos;
3146  pkt->stream_index = st->index;
3147  ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3148  if (ret < 0) {
3149  av_packet_unref(pkt);
3150  return AVERROR(ENOMEM);
3151  }
3152  }
3153 
3154  return 0;
3155 }
3156 
3157 /* reconstruct full wavpack blocks from mangled matroska ones */
3159  uint8_t **pdst, int *size)
3160 {
3161  uint8_t *dst = NULL;
3162  int dstlen = 0;
3163  int srclen = *size;
3164  uint32_t samples;
3165  uint16_t ver;
3166  int ret, offset = 0;
3167 
3168  if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
3169  return AVERROR_INVALIDDATA;
3170 
3171  ver = AV_RL16(track->stream->codecpar->extradata);
3172 
3173  samples = AV_RL32(src);
3174  src += 4;
3175  srclen -= 4;
3176 
3177  while (srclen >= 8) {
3178  int multiblock;
3179  uint32_t blocksize;
3180  uint8_t *tmp;
3181 
3182  uint32_t flags = AV_RL32(src);
3183  uint32_t crc = AV_RL32(src + 4);
3184  src += 8;
3185  srclen -= 8;
3186 
3187  multiblock = (flags & 0x1800) != 0x1800;
3188  if (multiblock) {
3189  if (srclen < 4) {
3190  ret = AVERROR_INVALIDDATA;
3191  goto fail;
3192  }
3193  blocksize = AV_RL32(src);
3194  src += 4;
3195  srclen -= 4;
3196  } else
3197  blocksize = srclen;
3198 
3199  if (blocksize > srclen) {
3200  ret = AVERROR_INVALIDDATA;
3201  goto fail;
3202  }
3203 
3204  tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3205  if (!tmp) {
3206  ret = AVERROR(ENOMEM);
3207  goto fail;
3208  }
3209  dst = tmp;
3210  dstlen += blocksize + 32;
3211 
3212  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3213  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3214  AV_WL16(dst + offset + 8, ver); // version
3215  AV_WL16(dst + offset + 10, 0); // track/index_no
3216  AV_WL32(dst + offset + 12, 0); // total samples
3217  AV_WL32(dst + offset + 16, 0); // block index
3218  AV_WL32(dst + offset + 20, samples); // number of samples
3219  AV_WL32(dst + offset + 24, flags); // flags
3220  AV_WL32(dst + offset + 28, crc); // crc
3221  memcpy(dst + offset + 32, src, blocksize); // block data
3222 
3223  src += blocksize;
3224  srclen -= blocksize;
3225  offset += blocksize + 32;
3226  }
3227 
3228  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3229 
3230  *pdst = dst;
3231  *size = dstlen;
3232 
3233  return 0;
3234 
3235 fail:
3236  av_freep(&dst);
3237  return ret;
3238 }
3239 
3241  uint8_t **pdst, int *size)
3242 {
3243  uint8_t *dst;
3244  int dstlen = *size + 8;
3245 
3246  dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3247  if (!dst)
3248  return AVERROR(ENOMEM);
3249 
3250  AV_WB32(dst, dstlen);
3251  AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3252  memcpy(dst + 8, src, dstlen - 8);
3253  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3254 
3255  *pdst = dst;
3256  *size = dstlen;
3257 
3258  return 0;
3259 }
3260 
3262  MatroskaTrack *track,
3263  AVStream *st,
3264  uint8_t *data, int data_len,
3265  uint64_t timecode,
3266  uint64_t duration,
3267  int64_t pos)
3268 {
3269  AVPacket pktl, *pkt = &pktl;
3270  uint8_t *id, *settings, *text, *buf;
3271  int id_len, settings_len, text_len;
3272  uint8_t *p, *q;
3273  int err;
3274 
3275  if (data_len <= 0)
3276  return AVERROR_INVALIDDATA;
3277 
3278  p = data;
3279  q = data + data_len;
3280 
3281  id = p;
3282  id_len = -1;
3283  while (p < q) {
3284  if (*p == '\r' || *p == '\n') {
3285  id_len = p - id;
3286  if (*p == '\r')
3287  p++;
3288  break;
3289  }
3290  p++;
3291  }
3292 
3293  if (p >= q || *p != '\n')
3294  return AVERROR_INVALIDDATA;
3295  p++;
3296 
3297  settings = p;
3298  settings_len = -1;
3299  while (p < q) {
3300  if (*p == '\r' || *p == '\n') {
3301  settings_len = p - settings;
3302  if (*p == '\r')
3303  p++;
3304  break;
3305  }
3306  p++;
3307  }
3308 
3309  if (p >= q || *p != '\n')
3310  return AVERROR_INVALIDDATA;
3311  p++;
3312 
3313  text = p;
3314  text_len = q - p;
3315  while (text_len > 0) {
3316  const int len = text_len - 1;
3317  const uint8_t c = p[len];
3318  if (c != '\r' && c != '\n')
3319  break;
3320  text_len = len;
3321  }
3322 
3323  if (text_len <= 0)
3324  return AVERROR_INVALIDDATA;
3325 
3326  err = av_new_packet(pkt, text_len);
3327  if (err < 0) {
3328  return err;
3329  }
3330 
3331  memcpy(pkt->data, text, text_len);
3332 
3333  if (id_len > 0) {
3334  buf = av_packet_new_side_data(pkt,
3336  id_len);
3337  if (!buf) {
3338  av_packet_unref(pkt);
3339  return AVERROR(ENOMEM);
3340  }
3341  memcpy(buf, id, id_len);
3342  }
3343 
3344  if (settings_len > 0) {
3345  buf = av_packet_new_side_data(pkt,
3347  settings_len);
3348  if (!buf) {
3349  av_packet_unref(pkt);
3350  return AVERROR(ENOMEM);
3351  }
3352  memcpy(buf, settings, settings_len);
3353  }
3354 
3355  // Do we need this for subtitles?
3356  // pkt->flags = AV_PKT_FLAG_KEY;
3357 
3358  pkt->stream_index = st->index;
3359  pkt->pts = timecode;
3360 
3361  // Do we need this for subtitles?
3362  // pkt->dts = timecode;
3363 
3364  pkt->duration = duration;
3365  pkt->pos = pos;
3366 
3367  err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3368  if (err < 0) {
3369  av_packet_unref(pkt);
3370  return AVERROR(ENOMEM);
3371  }
3372 
3373  return 0;
3374 }
3375 
3377  MatroskaTrack *track, AVStream *st,
3378  AVBufferRef *buf, uint8_t *data, int pkt_size,
3379  uint64_t timecode, uint64_t lace_duration,
3380  int64_t pos, int is_keyframe,
3381  uint8_t *additional, uint64_t additional_id, int additional_size,
3382  int64_t discard_padding)
3383 {
3384  MatroskaTrackEncoding *encodings = track->encodings.elem;
3385  uint8_t *pkt_data = data;
3386  int res;
3387  AVPacket pktl, *pkt = &pktl;
3388 
3389  if (encodings && !encodings->type && encodings->scope & 1) {
3390  res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
3391  if (res < 0)
3392  return res;
3393  }
3394 
3395  if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3396  uint8_t *wv_data;
3397  res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
3398  if (res < 0) {
3399  av_log(matroska->ctx, AV_LOG_ERROR,
3400  "Error parsing a wavpack block.\n");
3401  goto fail;
3402  }
3403  if (pkt_data != data)
3404  av_freep(&pkt_data);
3405  pkt_data = wv_data;
3406  }
3407 
3408  if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3409  AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3410  uint8_t *pr_data;
3411  res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
3412  if (res < 0) {
3413  av_log(matroska->ctx, AV_LOG_ERROR,
3414  "Error parsing a prores block.\n");
3415  goto fail;
3416  }
3417  if (pkt_data != data)
3418  av_freep(&pkt_data);
3419  pkt_data = pr_data;
3420  }
3421 
3422  av_init_packet(pkt);
3423  if (pkt_data != data)
3424  pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3425  NULL, NULL, 0);
3426  else
3427  pkt->buf = av_buffer_ref(buf);
3428 
3429  if (!pkt->buf) {
3430  res = AVERROR(ENOMEM);
3431  goto fail;
3432  }
3433 
3434  pkt->data = pkt_data;
3435  pkt->size = pkt_size;
3436  pkt->flags = is_keyframe;
3437  pkt->stream_index = st->index;
3438 
3439  if (additional_size > 0) {
3440  uint8_t *side_data = av_packet_new_side_data(pkt,
3442  additional_size + 8);
3443  if (!side_data) {
3444  av_packet_unref(pkt);
3445  return AVERROR(ENOMEM);
3446  }
3447  AV_WB64(side_data, additional_id);
3448  memcpy(side_data + 8, additional, additional_size);
3449  }
3450 
3451  if (discard_padding) {
3452  uint8_t *side_data = av_packet_new_side_data(pkt,
3454  10);
3455  if (!side_data) {
3456  av_packet_unref(pkt);
3457  return AVERROR(ENOMEM);
3458  }
3459  discard_padding = av_rescale_q(discard_padding,
3460  (AVRational){1, 1000000000},
3461  (AVRational){1, st->codecpar->sample_rate});
3462  if (discard_padding > 0) {
3463  AV_WL32(side_data + 4, discard_padding);
3464  } else {
3465  AV_WL32(side_data, -discard_padding);
3466  }
3467  }
3468 
3469  if (track->ms_compat)
3470  pkt->dts = timecode;
3471  else
3472  pkt->pts = timecode;
3473  pkt->pos = pos;
3474  pkt->duration = lace_duration;
3475 
3476 #if FF_API_CONVERGENCE_DURATION
3478  if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3479  pkt->convergence_duration = lace_duration;
3480  }
3482 #endif
3483 
3484  res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3485  if (res < 0) {
3486  av_packet_unref(pkt);
3487  return AVERROR(ENOMEM);
3488  }
3489 
3490  return 0;
3491 
3492 fail:
3493  if (pkt_data != data)
3494  av_freep(&pkt_data);
3495  return res;
3496 }
3497 
3499  int size, int64_t pos, uint64_t cluster_time,
3500  uint64_t block_duration, int is_keyframe,
3501  uint8_t *additional, uint64_t additional_id, int additional_size,
3502  int64_t cluster_pos, int64_t discard_padding)
3503 {
3504  uint64_t timecode = AV_NOPTS_VALUE;
3505  MatroskaTrack *track;
3506  AVIOContext pb;
3507  int res = 0;
3508  AVStream *st;
3509  int16_t block_time;
3510  uint32_t lace_size[256];
3511  int n, flags, laces = 0;
3512  uint64_t num;
3513  int trust_default_duration = 1;
3514 
3515  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3516 
3517  if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3518  return n;
3519  data += n;
3520  size -= n;
3521 
3522  track = matroska_find_track_by_num(matroska, num);
3523  if (!track || !track->stream) {
3524  av_log(matroska->ctx, AV_LOG_INFO,
3525  "Invalid stream %"PRIu64"\n", num);
3526  return AVERROR_INVALIDDATA;
3527  } else if (size <= 3)
3528  return 0;
3529  st = track->stream;
3530  if (st->discard >= AVDISCARD_ALL)
3531  return res;
3532  av_assert1(block_duration != AV_NOPTS_VALUE);
3533 
3534  block_time = sign_extend(AV_RB16(data), 16);
3535  data += 2;
3536  flags = *data++;
3537  size -= 3;
3538  if (is_keyframe == -1)
3539  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3540 
3541  if (cluster_time != (uint64_t) -1 &&
3542  (block_time >= 0 || cluster_time >= -block_time)) {
3543  timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3544  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3545  timecode < track->end_timecode)
3546  is_keyframe = 0; /* overlapping subtitles are not key frame */
3547  if (is_keyframe) {
3548  ff_reduce_index(matroska->ctx, st->index);
3549  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3551  }
3552  }
3553 
3554  if (matroska->skip_to_keyframe &&
3555  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3556  // Compare signed timecodes. Timecode may be negative due to codec delay
3557  // offset. We don't support timestamps greater than int64_t anyway - see
3558  // AVPacket's pts.
3559  if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3560  return res;
3561  if (is_keyframe)
3562  matroska->skip_to_keyframe = 0;
3563  else if (!st->skip_to_keyframe) {
3564  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3565  matroska->skip_to_keyframe = 0;
3566  }
3567  }
3568 
3569  res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3570  &pb, lace_size, &laces);
3571  if (res < 0) {
3572  av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3573  return res;
3574  }
3575 
3576  if (track->audio.samplerate == 8000) {
3577  // If this is needed for more codecs, then add them here
3578  if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3579  if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3580  trust_default_duration = 0;
3581  }
3582  }
3583 
3584  if (!block_duration && trust_default_duration)
3585  block_duration = track->default_duration * laces / matroska->time_scale;
3586 
3587  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3588  track->end_timecode =
3589  FFMAX(track->end_timecode, timecode + block_duration);
3590 
3591  for (n = 0; n < laces; n++) {
3592  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3593 
3594  if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
3598  st->codecpar->block_align && track->audio.sub_packet_size) {
3599  res = matroska_parse_rm_audio(matroska, track, st, data,
3600  lace_size[n],
3601  timecode, pos);
3602  if (res)
3603  return res;
3604 
3605  } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3606  res = matroska_parse_webvtt(matroska, track, st,
3607  data, lace_size[n],
3608  timecode, lace_duration,
3609  pos);
3610  if (res)
3611  return res;
3612  } else {
3613  res = matroska_parse_frame(matroska, track, st, buf, data, lace_size[n],
3614  timecode, lace_duration, pos,
3615  !n ? is_keyframe : 0,
3616  additional, additional_id, additional_size,
3617  discard_padding);
3618  if (res)
3619  return res;
3620  }
3621 
3622  if (timecode != AV_NOPTS_VALUE)
3623  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3624  data += lace_size[n];
3625  }
3626 
3627  return 0;
3628 }
3629 
3631 {
3632  MatroskaCluster *cluster = &matroska->current_cluster;
3633  MatroskaBlock *block = &cluster->block;
3634  int res;
3635 
3636  av_assert0(matroska->num_levels <= 2);
3637 
3638  if (matroska->num_levels == 1) {
3639  res = ebml_parse(matroska, matroska_segment, NULL);
3640 
3641  if (res == 1) {
3642  /* Found a cluster: subtract the size of the ID already read. */
3643  cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3644 
3645  res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3646  if (res < 0)
3647  return res;
3648  }
3649  }
3650 
3651  if (matroska->num_levels == 2) {
3652  /* We are inside a cluster. */
3653  res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3654 
3655  if (res >= 0 && block->bin.size > 0) {
3656  int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3657  uint8_t* additional = block->additional.size > 0 ?
3658  block->additional.data : NULL;
3659 
3660  res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3661  block->bin.size, block->bin.pos,
3662  cluster->timecode, block->duration,
3663  is_keyframe, additional, block->additional_id,
3664  block->additional.size, cluster->pos,
3665  block->discard_padding);
3666  }
3667 
3668  ebml_free(matroska_blockgroup, block);
3669  memset(block, 0, sizeof(*block));
3670  } else if (!matroska->num_levels) {
3671  if (!avio_feof(matroska->ctx->pb)) {
3672  avio_r8(matroska->ctx->pb);
3673  if (!avio_feof(matroska->ctx->pb)) {
3674  av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3675  "end of segment.\n");
3676  return AVERROR_INVALIDDATA;
3677  }
3678  }
3679  matroska->done = 1;
3680  return AVERROR_EOF;
3681  }
3682 
3683  return res;
3684 }
3685 
3687 {
3688  MatroskaDemuxContext *matroska = s->priv_data;
3689  int ret = 0;
3690 
3691  if (matroska->resync_pos == -1) {
3692  // This can only happen if generic seeking has been used.
3693  matroska->resync_pos = avio_tell(s->pb);
3694  }
3695 
3696  while (matroska_deliver_packet(matroska, pkt)) {
3697  if (matroska->done)
3698  return (ret < 0) ? ret : AVERROR_EOF;
3699  if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3700  ret = matroska_resync(matroska, matroska->resync_pos);
3701  }
3702 
3703  return 0;
3704 }
3705 
3706 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3707  int64_t timestamp, int flags)
3708 {
3709  MatroskaDemuxContext *matroska = s->priv_data;
3710  MatroskaTrack *tracks = NULL;
3711  AVStream *st = s->streams[stream_index];
3712  int i, index;
3713 
3714  /* Parse the CUES now since we need the index data to seek. */
3715  if (matroska->cues_parsing_deferred > 0) {
3716  matroska->cues_parsing_deferred = 0;
3717  matroska_parse_cues(matroska);
3718  }
3719 
3720  if (!st->nb_index_entries)
3721  goto err;
3722  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3723 
3724  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3725  matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3726  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3727  matroska_clear_queue(matroska);
3728  if (matroska_parse_cluster(matroska) < 0)
3729  break;
3730  }
3731  }
3732 
3733  matroska_clear_queue(matroska);
3734  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3735  goto err;
3736 
3737  tracks = matroska->tracks.elem;
3738  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3739  tracks[i].audio.pkt_cnt = 0;
3740  tracks[i].audio.sub_packet_cnt = 0;
3741  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3742  tracks[i].end_timecode = 0;
3743  }
3744 
3745  /* We seek to a level 1 element, so set the appropriate status. */
3746  matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3747  if (flags & AVSEEK_FLAG_ANY) {
3748  st->skip_to_keyframe = 0;
3749  matroska->skip_to_timecode = timestamp;
3750  } else {
3751  st->skip_to_keyframe = 1;
3752  matroska->skip_to_timecode = st->index_entries[index].timestamp;
3753  }
3754  matroska->skip_to_keyframe = 1;
3755  matroska->done = 0;
3756  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3757  return 0;
3758 err:
3759  // slightly hackish but allows proper fallback to
3760  // the generic seeking code.
3761  matroska_reset_status(matroska, 0, -1);
3762  matroska->resync_pos = -1;
3763  matroska_clear_queue(matroska);
3764  st->skip_to_keyframe =
3765  matroska->skip_to_keyframe = 0;
3766  matroska->done = 0;
3767  return -1;
3768 }
3769 
3771 {
3772  MatroskaDemuxContext *matroska = s->priv_data;
3773  MatroskaTrack *tracks = matroska->tracks.elem;
3774  int n;
3775 
3776  matroska_clear_queue(matroska);
3777 
3778  for (n = 0; n < matroska->tracks.nb_elem; n++)
3779  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3780  av_freep(&tracks[n].audio.buf);
3781  ebml_free(matroska_segment, matroska);
3782 
3783  return 0;
3784 }
3785 
3786 typedef struct {
3787  int64_t start_time_ns;
3788  int64_t end_time_ns;
3789  int64_t start_offset;
3790  int64_t end_offset;
3791 } CueDesc;
3792 
3793 /* This function searches all the Cues and returns the CueDesc corresponding to
3794  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3795  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3796  */
3797 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3798  MatroskaDemuxContext *matroska = s->priv_data;
3799  CueDesc cue_desc;
3800  int i;
3801  int nb_index_entries = s->streams[0]->nb_index_entries;
3802  AVIndexEntry *index_entries = s->streams[0]->index_entries;
3803  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3804  for (i = 1; i < nb_index_entries; i++) {
3805  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3806  index_entries[i].timestamp * matroska->time_scale > ts) {
3807  break;
3808  }
3809  }
3810  --i;
3811  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3812  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3813  if (i != nb_index_entries - 1) {
3814  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3815  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3816  } else {
3817  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3818  // FIXME: this needs special handling for files where Cues appear
3819  // before Clusters. the current logic assumes Cues appear after
3820  // Clusters.
3821  cue_desc.end_offset = cues_start - matroska->segment_start;
3822  }
3823  return cue_desc;
3824 }
3825 
3827 {
3828  MatroskaDemuxContext *matroska = s->priv_data;
3829  uint32_t id = matroska->current_id;
3830  int64_t cluster_pos, before_pos;
3831  int index, rv = 1;
3832  if (s->streams[0]->nb_index_entries <= 0) return 0;
3833  // seek to the first cluster using cues.
3834  index = av_index_search_timestamp(s->streams[0], 0, 0);
3835  if (index < 0) return 0;
3836  cluster_pos = s->streams[0]->index_entries[index].pos;
3837  before_pos = avio_tell(s->pb);
3838  while (1) {
3839  uint64_t cluster_id, cluster_length;
3840  int read;
3841  AVPacket *pkt;
3842  avio_seek(s->pb, cluster_pos, SEEK_SET);
3843  // read cluster id and length
3844  read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3845  if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3846  break;
3847  read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3848  if (read < 0)
3849  break;
3850 
3851  matroska_reset_status(matroska, 0, cluster_pos);
3852  matroska_clear_queue(matroska);
3853  if (matroska_parse_cluster(matroska) < 0 ||
3854  !matroska->queue) {
3855  break;
3856  }
3857  pkt = &matroska->queue->pkt;
3858  // 4 + read is the length of the cluster id and the cluster length field.
3859  cluster_pos += 4 + read + cluster_length;
3860  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3861  rv = 0;
3862  break;
3863  }
3864  }
3865 
3866  /* Restore the status after matroska_read_header: */
3867  matroska_reset_status(matroska, id, before_pos);
3868 
3869  return rv;
3870 }
3871 
3872 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3873  double min_buffer, double* buffer,
3874  double* sec_to_download, AVFormatContext *s,
3875  int64_t cues_start)
3876 {
3877  double nano_seconds_per_second = 1000000000.0;
3878  double time_sec = time_ns / nano_seconds_per_second;
3879  int rv = 0;
3880  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3881  int64_t end_time_ns = time_ns + time_to_search_ns;
3882  double sec_downloaded = 0.0;
3883  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3884  if (desc_curr.start_time_ns == -1)
3885  return -1;
3886  *sec_to_download = 0.0;
3887 
3888  // Check for non cue start time.
3889  if (time_ns > desc_curr.start_time_ns) {
3890  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3891  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3892  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3893  double timeToDownload = (cueBytes * 8.0) / bps;
3894 
3895  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3896  *sec_to_download += timeToDownload;
3897 
3898  // Check if the search ends within the first cue.
3899  if (desc_curr.end_time_ns >= end_time_ns) {
3900  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3901  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3902  sec_downloaded = percent_to_sub * sec_downloaded;
3903  *sec_to_download = percent_to_sub * *sec_to_download;
3904  }
3905 
3906  if ((sec_downloaded + *buffer) <= min_buffer) {
3907  return 1;
3908  }
3909 
3910  // Get the next Cue.
3911  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3912  }
3913 
3914  while (desc_curr.start_time_ns != -1) {
3915  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3916  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3917  double desc_sec = desc_ns / nano_seconds_per_second;
3918  double bits = (desc_bytes * 8.0);
3919  double time_to_download = bits / bps;
3920 
3921  sec_downloaded += desc_sec - time_to_download;
3922  *sec_to_download += time_to_download;
3923 
3924  if (desc_curr.end_time_ns >= end_time_ns) {
3925  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3926  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3927  sec_downloaded = percent_to_sub * sec_downloaded;
3928  *sec_to_download = percent_to_sub * *sec_to_download;
3929 
3930  if ((sec_downloaded + *buffer) <= min_buffer)
3931  rv = 1;
3932  break;
3933  }
3934 
3935  if ((sec_downloaded + *buffer) <= min_buffer) {
3936  rv = 1;
3937  break;
3938  }
3939 
3940  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3941  }
3942  *buffer = *buffer + sec_downloaded;
3943  return rv;
3944 }
3945 
3946 /* This function computes the bandwidth of the WebM file with the help of
3947  * buffer_size_after_time_downloaded() function. Both of these functions are
3948  * adapted from WebM Tools project and are adapted to work with FFmpeg's
3949  * Matroska parsing mechanism.
3950  *
3951  * Returns the bandwidth of the file on success; -1 on error.
3952  * */
3953 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3954 {
3955  MatroskaDemuxContext *matroska = s->priv_data;
3956  AVStream *st = s->streams[0];
3957  double bandwidth = 0.0;
3958  int i;
3959 
3960  for (i = 0; i < st->nb_index_entries; i++) {
3961  int64_t prebuffer_ns = 1000000000;
3962  int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3963  double nano_seconds_per_second = 1000000000.0;
3964  int64_t prebuffered_ns = time_ns + prebuffer_ns;
3965  double prebuffer_bytes = 0.0;
3966  int64_t temp_prebuffer_ns = prebuffer_ns;
3967  int64_t pre_bytes, pre_ns;
3968  double pre_sec, prebuffer, bits_per_second;
3969  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3970 
3971  // Start with the first Cue.
3972  CueDesc desc_end = desc_beg;
3973 
3974  // Figure out how much data we have downloaded for the prebuffer. This will
3975  // be used later to adjust the bits per sample to try.
3976  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3977  // Prebuffered the entire Cue.
3978  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3979  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3980  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3981  }
3982  if (desc_end.start_time_ns == -1) {
3983  // The prebuffer is larger than the duration.
3984  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3985  return -1;
3986  bits_per_second = 0.0;
3987  } else {
3988  // The prebuffer ends in the last Cue. Estimate how much data was
3989  // prebuffered.
3990  pre_bytes = desc_end.end_offset - desc_end.start_offset;
3991  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3992  pre_sec = pre_ns / nano_seconds_per_second;
3993  prebuffer_bytes +=
3994  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3995 
3996  prebuffer = prebuffer_ns / nano_seconds_per_second;
3997 
3998  // Set this to 0.0 in case our prebuffer buffers the entire video.
3999  bits_per_second = 0.0;
4000  do {
4001  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4002  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4003  double desc_sec = desc_ns / nano_seconds_per_second;
4004  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4005 
4006  // Drop the bps by the percentage of bytes buffered.
4007  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4008  double mod_bits_per_second = calc_bits_per_second * percent;
4009 
4010  if (prebuffer < desc_sec) {
4011  double search_sec =
4012  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4013 
4014  // Add 1 so the bits per second should be a little bit greater than file
4015  // datarate.
4016  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4017  const double min_buffer = 0.0;
4018  double buffer = prebuffer;
4019  double sec_to_download = 0.0;
4020 
4021  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4022  min_buffer, &buffer, &sec_to_download,
4023  s, cues_start);
4024  if (rv < 0) {
4025  return -1;
4026  } else if (rv == 0) {
4027  bits_per_second = (double)(bps);
4028  break;
4029  }
4030  }
4031 
4032  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4033  } while (desc_end.start_time_ns != -1);
4034  }
4035  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4036  }
4037  return (int64_t)bandwidth;
4038 }
4039 
4040 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4041 {
4042  MatroskaDemuxContext *matroska = s->priv_data;
4043  EbmlList *seekhead_list = &matroska->seekhead;
4044  MatroskaSeekhead *seekhead = seekhead_list->elem;
4045  char *buf;
4046  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4047  int i;
4048  int end = 0;
4049 
4050  // determine cues start and end positions
4051  for (i = 0; i < seekhead_list->nb_elem; i++)
4052  if (seekhead[i].id == MATROSKA_ID_CUES)
4053  break;
4054 
4055  if (i >= seekhead_list->nb_elem) return -1;
4056 
4057  before_pos = avio_tell(matroska->ctx->pb);
4058  cues_start = seekhead[i].pos + matroska->segment_start;
4059  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4060  // cues_end is computed as cues_start + cues_length + length of the
4061  // Cues element ID (i.e. 4) + EBML length of the Cues element.
4062  // cues_end is inclusive and the above sum is reduced by 1.
4063  uint64_t cues_length, cues_id;
4064  int bytes_read;
4065  bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4066  if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4067  return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4068  bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4069  if (bytes_read < 0)
4070  return bytes_read;
4071  cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4072  }
4073  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4074  if (cues_start == -1 || cues_end == -1) return -1;
4075 
4076  // parse the cues
4077  matroska_parse_cues(matroska);
4078 
4079  // cues start
4080  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4081 
4082  // cues end
4083  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4084 
4085  // if the file has cues at the start, fix up the init range so that
4086  // it does not include it
4087  if (cues_start <= init_range)
4088  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4089 
4090  // bandwidth
4091  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4092  if (bandwidth < 0) return -1;
4093  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4094 
4095  // check if all clusters start with key frames
4097 
4098  // store cue point timestamps as a comma separated list for checking subsegment alignment in
4099  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4100  buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4101  if (!buf) return -1;
4102  strcpy(buf, "");
4103  for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4104  int ret = snprintf(buf + end, 20,
4105  "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4106  i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4107  if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4108  av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4109  av_free(buf);
4110  return AVERROR_INVALIDDATA;
4111  }
4112  end += ret;
4113  }
4116 
4117  return 0;
4118 }
4119 
4121 {
4122  char *buf;
4123  int ret = matroska_read_header(s);
4124  int64_t init_range;
4125  MatroskaTrack *tracks;
4126  MatroskaDemuxContext *matroska = s->priv_data;
4127  if (ret) {
4128  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4129  return -1;
4130  }
4131  if (!s->nb_streams) {
4133  av_log(s, AV_LOG_ERROR, "No streams found\n");
4134  return AVERROR_INVALIDDATA;
4135  }
4136 
4137  if (!matroska->is_live) {
4138  buf = av_asprintf("%g", matroska->duration);
4139  if (!buf) return AVERROR(ENOMEM);
4142 
4143  // initialization range
4144  // 5 is the offset of Cluster ID.
4145  init_range = avio_tell(s->pb) - 5;
4146  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4147  }
4148 
4149  // basename of the file
4150  buf = strrchr(s->url, '/');
4151  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4152 
4153  // track number
4154  tracks = matroska->tracks.elem;
4155  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4156 
4157  // parse the cues and populate Cue related fields
4158  if (!matroska->is_live) {
4159  ret = webm_dash_manifest_cues(s, init_range);
4160  if (ret < 0) {
4161  av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4162  return ret;
4163  }
4164  }
4165 
4166  // use the bandwidth from the command line if it was provided
4167  if (matroska->bandwidth > 0) {
4169  matroska->bandwidth, 0);
4170  }
4171  return 0;
4172 }
4173 
4175 {
4176  return AVERROR_EOF;
4177 }
4178 
4179 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4180 static const AVOption options[] = {
4181  { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
4182  { "bandwidth", "bandwidth of this stream to be specified in the DASH manifest.", OFFSET(bandwidth), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
4183  { NULL },
4184 };
4185 
4186 static const AVClass webm_dash_class = {
4187  .class_name = "WebM DASH Manifest demuxer",
4188  .item_name = av_default_item_name,
4189  .option = options,
4190  .version = LIBAVUTIL_VERSION_INT,
4191 };
4192 
4194  .name = "matroska,webm",
4195  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4196  .extensions = "mkv,mk3d,mka,mks",
4197  .priv_data_size = sizeof(MatroskaDemuxContext),
4203  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4204 };
4205 
4207  .name = "webm_dash_manifest",
4208  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4209  .priv_data_size = sizeof(MatroskaDemuxContext),
4213  .priv_class = &webm_dash_class,
4214 };
int32_t pitch
Rotation around the right vector [-90, 90].
Definition: spherical.h:127
#define MATROSKA_ID_SEEKPREROLL
Definition: matroska.h:95
const char * s
Definition: matroskadec.c:106
#define MATROSKA_ID_VIDEOPROJECTIONPOSEYAW
Definition: matroska.h:159
AVSphericalMapping * av_spherical_alloc(size_t *size)
Allocate a AVSphericalVideo structure and initialize its fields to default values.
Definition: spherical.c:24
uint64_t codec_delay_in_track_tb
Definition: matroskadec.c:247
enum AVChromaLocation chroma_location
Definition: avcodec.h:4071
#define AV_DISPOSITION_METADATA
Definition: avformat.h:862
#define NULL
Definition: coverity.c:32
MatroskaBlock block
Definition: matroskadec.c:328
static EbmlSyntax matroska_simpletag[]
Definition: matroskadec.c:651
#define MATROSKA_ID_BLOCKADDID
Definition: matroska.h:230
#define MATROSKA_ID_TRACKDEFAULTDURATION
Definition: matroska.h:104
enum AVFieldOrder field_order
Video only.
Definition: avcodec.h:4062
static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska, MatroskaTrack *track, AVStream *st, uint8_t *data, int size, uint64_t timecode, int64_t pos)
Definition: matroskadec.c:3080
Bytestream IO Context.
Definition: avio.h:161
enum AVColorTransferCharacteristic color_trc
Definition: avcodec.h:4069
#define MATROSKA_ID_VIDEOFLAGINTERLACED
Definition: matroska.h:121
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define MATROSKA_ID_VIDEOCOLOR_GX
Definition: matroska.h:147
uint64_t seek_preroll
Definition: matroskadec.c:241
const char *const ff_matroska_video_stereo_plane[MATROSKA_VIDEO_STEREO_PLANE_COUNT]
Definition: matroska.c:165
static void matroska_convert_tags(AVFormatContext *s)
Definition: matroskadec.c:1736
#define MATROSKA_ID_DATEUTC
Definition: matroska.h:71
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:126
union EbmlSyntax::@271 def
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1351
uint64_t type
Definition: matroskadec.c:232
unsigned MaxCLL
Max content light level (cd/m^2).
#define MATROSKA_ID_TRACKFLAGLACING
Definition: matroska.h:101
static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: matroskadec.c:4174
#define MATROSKA_ID_TRACKENTRY
Definition: matroska.h:75
static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
Definition: matroskadec.c:2949
#define MATROSKA_ID_VIDEODISPLAYHEIGHT
Definition: matroska.h:113
uint64_t version
Definition: matroskadec.c:125
AVOption.
Definition: opt.h:246
static EbmlSyntax matroska_blockmore[]
Definition: matroskadec.c:709
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:135
AVInputFormat ff_matroska_demuxer
Definition: matroskadec.c:4193
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:59
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail, AVPacket *pkt, int flags)
Append an AVPacket to the list.
Definition: utils.c:445
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2048
AVPacketList * queue
Definition: matroskadec.c:366
#define MATROSKA_ID_VIDEOPROJECTIONPOSEROLL
Definition: matroska.h:161
#define MATROSKA_ID_CUETRACKPOSITION
Definition: matroska.h:192
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3157
#define MATROSKA_ID_CODECPRIVATE
Definition: matroska.h:89
const unsigned char ff_sipr_subpk_size[4]
Definition: rmsipr.c:25
#define MATROSKA_ID_TAGTARGETS_TYPE
Definition: matroska.h:210
uint64_t display_unit
Definition: matroskadec.c:194
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static EbmlSyntax matroska_track_video[19]
Definition: matroskadec.c:397
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define INITIALIZATION_RANGE
Definition: matroska.h:371
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:228
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1513
static int webm_clusters_start_with_keyframe(AVFormatContext *s)
Definition: matroskadec.c:3826
else temp
Definition: vf_mcdeint.c:256
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4928
int64_t pos
Definition: avformat.h:809
#define MATROSKA_ID_ENCODINGTYPE
Definition: matroska.h:173
#define MATROSKA_ID_AUDIOBITDEPTH
Definition: matroska.h:167
uint64_t chapteruid
Definition: matroskadec.c:298
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2519
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
#define MATROSKA_ID_TRACKFLAGDEFAULT
Definition: matroska.h:99
uint64_t additional_id
Definition: matroskadec.c:322
EbmlList tag
Definition: matroskadec.c:304
uint64_t uid
Definition: matroskadec.c:231
int64_t data_offset
offset of the first packet
Definition: internal.h:80
static EbmlSyntax matroska_segments[]
Definition: matroskadec.c:704
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
MatroskaCluster current_cluster
Definition: matroskadec.c:382
uint32_t fourcc
Definition: vaapi_decode.c:238
Video represents a portion of a sphere mapped on a flat surface using equirectangular projection...
Definition: spherical.h:72
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3981
AVRational white_point[2]
CIE 1931 xy chromaticity coords of white point.
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:942
#define MATROSKA_ID_TAGTARGETS_ATTACHUID
Definition: matroska.h:214
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:881
int size
Definition: avcodec.h:1494
static EbmlSyntax matroska_track_video_projection[]
Definition: matroskadec.c:464
#define MATROSKA_ID_CLUSTERPOSITION
Definition: matroska.h:225
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define MATROSKA_ID_FILEDATA
Definition: matroska.h:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1109
MatroskaTrackVideoProjection projection
Definition: matroskadec.c:200
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1810
#define EBML_ID_DOCTYPEREADVERSION
Definition: matroska.h:42
#define MATROSKA_ID_BLOCKREFERENCE
Definition: matroska.h:237
uint64_t flag_forced
Definition: matroskadec.c:240
int av_log2(unsigned v)
Definition: intmath.c:26
uint64_t max_size
Definition: matroskadec.c:126
#define MATROSKA_ID_TRACKTYPE
Definition: matroska.h:80
unsigned char * buffer
Start of the buffer.
Definition: avio.h:226
#define MATROSKA_ID_TAGTARGETS_CHAPTERUID
Definition: matroska.h:213
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
GLint GLenum type
Definition: opengl_enc.c:104
uint64_t flag_default
Definition: matroskadec.c:239
#define MATROSKA_ID_VIDEOCOLOR_RX
Definition: matroska.h:145
Video represents a sphere mapped on a flat surface using equirectangular projection.
Definition: spherical.h:56
#define MATROSKA_ID_VIDEOASPECTRATIO
Definition: matroska.h:125
#define MATROSKA_ID_MUXINGAPP
Definition: matroska.h:70
#define MATROSKA_ID_AUDIOCHANNELS
Definition: matroska.h:168
char * name
Definition: matroskadec.c:287
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
int has_primaries
Flag indicating whether the display primaries (and white point) are set.
const char * key
int version
Definition: avisynth_c.h:858
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static EbmlSyntax matroska_index[2]
Definition: matroskadec.c:397
discard all
Definition: avcodec.h:817
#define MATROSKA_ID_VIDEOPROJECTIONTYPE
Definition: matroska.h:157
MatroskaLevel levels[EBML_MAX_DEPTH]
Definition: matroskadec.c:344
static EbmlSyntax matroska_track_audio[]
Definition: matroskadec.c:495
static AVPacket pkt
#define MATROSKA_ID_CUECLUSTERPOSITION
Definition: matroska.h:196
#define MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX
Definition: matroska.h:153
static int ebml_read_binary(AVIOContext *pb, int length, int64_t pos, EbmlBin *bin)
Definition: matroskadec.c:980
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:788
MatroskaTrackAudio audio
Definition: matroskadec.c:243
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ
Definition: matroska.h:135
uint64_t duration
Definition: matroskadec.c:318
#define src
Definition: vp8dsp.c:254
const struct EbmlSyntax * n
Definition: matroskadec.c:107
#define MATROSKA_ID_EDITIONFLAGDEFAULT
Definition: matroska.h:260
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define MATROSKA_ID_CLUSTERTIMECODE
Definition: matroska.h:224
#define EBML_ID_DOCTYPE
Definition: matroska.h:40
static const struct @322 planes[]
#define MATROSKA_ID_ENCODINGENCALGO
Definition: matroska.h:180
static EbmlSyntax matroska_attachment[]
Definition: matroskadec.c:584
#define MATROSKA_ID_CHAPTERTIMEEND
Definition: matroska.h:253
enum AVColorSpace color_space
Definition: avcodec.h:4070
#define MATROSKA_ID_TRACKCONTENTENCODINGS
Definition: matroska.h:105
int frame_size
Audio only.
Definition: avcodec.h:4102
Mastering display metadata (based on SMPTE-2086:2014).
Definition: avcodec.h:1377
#define AV_LZO_OUTPUT_FULL
decoded data did not fit into output buffer
Definition: lzo.h:39
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4629
#define EBML_VERSION
Definition: matroska.h:30
#define MATROSKA_ID_FILEDESC
Definition: matroska.h:243
Format I/O context.
Definition: avformat.h:1357
#define EBML_ID_CRC32
Definition: matroska.h:46
uint64_t def
Definition: matroskadec.c:290
UID uid
Definition: mxfenc.c:2149
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: utils.c:1962
#define MATROSKA_ID_TRACKCONTENTENCODING
Definition: matroska.h:106
#define MATROSKA_ID_CODECDOWNLOADURL
Definition: matroska.h:92
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define AV_WB64(p, v)
Definition: intreadwrite.h:433
int64_t end_timecode
Definition: matroskadec.c:250
static int webm_dash_manifest_read_header(AVFormatContext *s)
Definition: matroskadec.c:4120
static EbmlSyntax matroska_mastering_meta[]
Definition: matroskadec.c:432
static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
Definition: matroskadec.c:917
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
void ff_reduce_index(AVFormatContext *s, int stream_index)
Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by dis...
Definition: utils.c:1976
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1490
Public dictionary API.
int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp)
Set a dictionary value to an ISO-8601 compliant timestamp string.
Definition: dict.c:258
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:247
static MatroskaLevel1Element * matroska_find_level1_elem(MatroskaDemuxContext *matroska, uint32_t id)
Definition: matroskadec.c:1117
uint64_t pixel_height
Definition: matroskadec.c:192
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
#define MATROSKA_ID_VIDEOCOLOR_BX
Definition: matroska.h:149
#define MATROSKA_ID_CHAPLANG
Definition: matroska.h:256
#define av_malloc(s)
uint64_t stereo_mode
Definition: matroskadec.c:197
MatroskaTrackOperation operation
Definition: matroskadec.c:244
MatroskaTrackVideo video
Definition: matroskadec.c:242
#define MATROSKA_ID_EDITIONFLAGORDERED
Definition: matroska.h:261
int width
Video only.
Definition: avcodec.h:4047
static EbmlSyntax matroska_cluster_parsing[8]
Definition: matroskadec.c:397
static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start)
Definition: matroskadec.c:3797
static const AVProfile aac_profiles[]
void * elem
Definition: matroskadec.c:114
AVOptions.
#define MATROSKA_ID_TRACKLANGUAGE
Definition: matroska.h:97
MatroskaTrackCompression compression
Definition: matroskadec.c:145