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) },
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 signed/unsigned "EBML" numbers.
1028  * Return: number of bytes processed, < 0 on error
1029  */
1031  uint8_t *data, uint32_t size, uint64_t *num)
1032 {
1033  AVIOContext pb;
1034  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
1035  return ebml_read_num(matroska, &pb, FFMIN(size, 8), num, 1);
1036 }
1037 
1038 /*
1039  * Same as above, but signed.
1040  */
1042  uint8_t *data, uint32_t size, int64_t *num)
1043 {
1044  uint64_t unum;
1045  int res;
1046 
1047  /* read as unsigned number first */
1048  if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
1049  return res;
1050 
1051  /* make signed (weird way) */
1052  *num = unum - ((1LL << (7 * res - 1)) - 1);
1053 
1054  return res;
1055 }
1056 
1057 static int ebml_parse(MatroskaDemuxContext *matroska,
1058  EbmlSyntax *syntax, void *data);
1059 
1060 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1061 {
1062  int i;
1063 
1064  // Whoever touches this should be aware of the duplication
1065  // existing in matroska_cluster_parsing.
1066  for (i = 0; syntax[i].id; i++)
1067  if (id == syntax[i].id)
1068  break;
1069 
1070  return &syntax[i];
1071 }
1072 
1073 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1074  void *data)
1075 {
1076  int res;
1077 
1078  if (data) {
1079  for (int i = 0; syntax[i].id; i++)
1080  switch (syntax[i].type) {
1081  case EBML_UINT:
1082  *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1083  break;
1084  case EBML_SINT:
1085  *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1086  break;
1087  case EBML_FLOAT:
1088  *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1089  break;
1090  case EBML_STR:
1091  case EBML_UTF8:
1092  // the default may be NULL
1093  if (syntax[i].def.s) {
1094  uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1095  *dst = av_strdup(syntax[i].def.s);
1096  if (!*dst)
1097  return AVERROR(ENOMEM);
1098  }
1099  break;
1100  }
1101 
1102  if (!matroska->levels[matroska->num_levels - 1].length) {
1103  matroska->num_levels--;
1104  return 0;
1105  }
1106  }
1107 
1108  do {
1109  res = ebml_parse(matroska, syntax, data);
1110  } while (!res);
1111 
1112  return res == LEVEL_ENDED ? 0 : res;
1113 }
1114 
1115 static int is_ebml_id_valid(uint32_t id)
1116 {
1117  // Due to endian nonsense in Matroska, the highest byte with any bits set
1118  // will contain the leading length bit. This bit in turn identifies the
1119  // total byte length of the element by its position within the byte.
1120  unsigned int bits = av_log2(id);
1121  return id && (bits + 7) / 8 == (8 - bits % 8);
1122 }
1123 
1124 /*
1125  * Allocate and return the entry for the level1 element with the given ID. If
1126  * an entry already exists, return the existing entry.
1127  */
1129  uint32_t id)
1130 {
1131  int i;
1132  MatroskaLevel1Element *elem;
1133 
1134  if (!is_ebml_id_valid(id))
1135  return NULL;
1136 
1137  // Some files link to all clusters; useless.
1138  if (id == MATROSKA_ID_CLUSTER)
1139  return NULL;
1140 
1141  // There can be multiple seekheads.
1142  if (id != MATROSKA_ID_SEEKHEAD) {
1143  for (i = 0; i < matroska->num_level1_elems; i++) {
1144  if (matroska->level1_elems[i].id == id)
1145  return &matroska->level1_elems[i];
1146  }
1147  }
1148 
1149  // Only a completely broken file would have more elements.
1150  // It also provides a low-effort way to escape from circular seekheads
1151  // (every iteration will add a level1 entry).
1152  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1153  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1154  return NULL;
1155  }
1156 
1157  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1158  *elem = (MatroskaLevel1Element){.id = id};
1159 
1160  return elem;
1161 }
1162 
1163 static int ebml_parse(MatroskaDemuxContext *matroska,
1164  EbmlSyntax *syntax, void *data)
1165 {
1166  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1167  // Forbid unknown-length EBML_NONE elements.
1169  [EBML_UINT] = 8,
1170  [EBML_SINT] = 8,
1171  [EBML_FLOAT] = 8,
1172  // max. 16 MB for strings
1173  [EBML_STR] = 0x1000000,
1174  [EBML_UTF8] = 0x1000000,
1175  // max. 256 MB for binary data
1176  [EBML_BIN] = 0x10000000,
1177  // no limits for anything else
1178  };
1179  AVIOContext *pb = matroska->ctx->pb;
1180  uint32_t id;
1181  uint64_t length;
1182  int64_t pos = avio_tell(pb), pos_alt;
1183  int res, update_pos = 1, level_check;
1184  MatroskaLevel1Element *level1_elem;
1185  MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1186 
1187  if (!matroska->current_id) {
1188  uint64_t id;
1189  res = ebml_read_num(matroska, pb, 4, &id, 0);
1190  if (res < 0) {
1191  if (pb->eof_reached && res == AVERROR_EOF) {
1192  if (matroska->is_live)
1193  // in live mode, finish parsing if EOF is reached.
1194  return 1;
1195  if (level && pos == avio_tell(pb)) {
1196  if (level->length == EBML_UNKNOWN_LENGTH) {
1197  // Unknown-length levels automatically end at EOF.
1198  matroska->num_levels--;
1199  return LEVEL_ENDED;
1200  } else {
1201  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1202  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1203  }
1204  }
1205  }
1206  return res;
1207  }
1208  matroska->current_id = id | 1 << 7 * res;
1209  pos_alt = pos + res;
1210  } else {
1211  pos_alt = pos;
1212  pos -= (av_log2(matroska->current_id) + 7) / 8;
1213  }
1214 
1215  id = matroska->current_id;
1216 
1217  syntax = ebml_parse_id(syntax, id);
1218  if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1219  if (level && level->length == EBML_UNKNOWN_LENGTH) {
1220  // Unknown-length levels end when an element from an upper level
1221  // in the hierarchy is encountered.
1222  while (syntax->def.n) {
1223  syntax = ebml_parse_id(syntax->def.n, id);
1224  if (syntax->id) {
1225  matroska->num_levels--;
1226  return LEVEL_ENDED;
1227  }
1228  };
1229  }
1230 
1231  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1232  "%"PRId64"\n", id, pos);
1233  update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1234  }
1235 
1236  if (data) {
1237  data = (char *) data + syntax->data_offset;
1238  if (syntax->list_elem_size) {
1239  EbmlList *list = data;
1240  void *newelem;
1241 
1242  if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1243  return AVERROR(ENOMEM);
1244  newelem = av_fast_realloc(list->elem,
1245  &list->alloc_elem_size,
1246  (list->nb_elem + 1) * syntax->list_elem_size);
1247  if (!newelem)
1248  return AVERROR(ENOMEM);
1249  list->elem = newelem;
1250  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1251  memset(data, 0, syntax->list_elem_size);
1252  list->nb_elem++;
1253  }
1254  }
1255 
1256  if (syntax->type != EBML_STOP) {
1257  matroska->current_id = 0;
1258  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1259  return res;
1260 
1261  pos_alt += res;
1262 
1263  if (matroska->num_levels > 0) {
1264  if (length != EBML_UNKNOWN_LENGTH &&
1265  level->length != EBML_UNKNOWN_LENGTH) {
1266  uint64_t elem_end = pos_alt + length,
1267  level_end = level->start + level->length;
1268 
1269  if (elem_end < level_end) {
1270  level_check = 0;
1271  } else if (elem_end == level_end) {
1272  level_check = LEVEL_ENDED;
1273  } else {
1274  av_log(matroska->ctx, AV_LOG_ERROR,
1275  "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1276  "containing master element ending at 0x%"PRIx64"\n",
1277  pos, elem_end, level_end);
1278  return AVERROR_INVALIDDATA;
1279  }
1280  } else if (length != EBML_UNKNOWN_LENGTH) {
1281  level_check = 0;
1282  } else if (level->length != EBML_UNKNOWN_LENGTH) {
1283  av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1284  "at 0x%"PRIx64" inside parent with finite size\n", pos);
1285  return AVERROR_INVALIDDATA;
1286  } else {
1287  level_check = 0;
1288  if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1289  || syntax->type == EBML_NEST)) {
1290  // According to the current specifications only clusters and
1291  // segments are allowed to be unknown-length. We also accept
1292  // other unknown-length master elements.
1293  av_log(matroska->ctx, AV_LOG_WARNING,
1294  "Found unknown-length element 0x%"PRIX32" other than "
1295  "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1296  "parsing will nevertheless be attempted.\n", id, pos);
1297  update_pos = -1;
1298  }
1299  }
1300  } else
1301  level_check = 0;
1302 
1303  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1304  if (length != EBML_UNKNOWN_LENGTH) {
1305  av_log(matroska->ctx, AV_LOG_ERROR,
1306  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1307  "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1308  length, max_lengths[syntax->type], id, pos);
1309  } else if (syntax->type != EBML_NONE) {
1310  av_log(matroska->ctx, AV_LOG_ERROR,
1311  "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1312  "unknown length, yet the length of an element of its "
1313  "type must be known.\n", id, pos);
1314  } else {
1315  av_log(matroska->ctx, AV_LOG_ERROR,
1316  "Found unknown-length element with ID 0x%"PRIX32" at "
1317  "pos. 0x%"PRIx64" for which no syntax for parsing is "
1318  "available.\n", id, pos);
1319  }
1320  return AVERROR_INVALIDDATA;
1321  }
1322 
1323  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1324  // Loosing sync will likely manifest itself as encountering unknown
1325  // elements which are not reliably distinguishable from elements
1326  // belonging to future extensions of the format.
1327  // We use a heuristic to detect such situations: If the current
1328  // element is not expected at the current syntax level and there
1329  // were only a few unknown elements in a row, then the element is
1330  // skipped or considered defective based upon the length of the
1331  // current element (i.e. how much would be skipped); if there were
1332  // more than a few skipped elements in a row and skipping the current
1333  // element would lead us more than SKIP_THRESHOLD away from the last
1334  // known good position, then it is inferred that an error occurred.
1335  // The dependency on the number of unknown elements in a row exists
1336  // because the distance to the last known good position is
1337  // automatically big if the last parsed element was big.
1338  // In both cases, each unknown element is considered equivalent to
1339  // UNKNOWN_EQUIV of skipped bytes for the check.
1340  // The whole check is only done for non-seekable output, because
1341  // in this situation skipped data can't simply be rechecked later.
1342  // This is especially important when using unkown length elements
1343  // as the check for whether a child exceeds its containing master
1344  // element is not effective in this situation.
1345  if (update_pos) {
1346  matroska->unknown_count = 0;
1347  } else {
1348  int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1349 
1350  if (matroska->unknown_count > 3)
1351  dist += pos_alt - matroska->resync_pos;
1352 
1353  if (dist > SKIP_THRESHOLD) {
1354  av_log(matroska->ctx, AV_LOG_ERROR,
1355  "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1356  "length 0x%"PRIx64" considered as invalid data. Last "
1357  "known good position 0x%"PRIx64", %d unknown elements"
1358  " in a row\n", id, pos, length, matroska->resync_pos,
1359  matroska->unknown_count);
1360  return AVERROR_INVALIDDATA;
1361  }
1362  }
1363  }
1364 
1365  if (update_pos > 0) {
1366  // We have found an element that is allowed at this place
1367  // in the hierarchy and it passed all checks, so treat the beginning
1368  // of the element as the "last known good" position.
1369  matroska->resync_pos = pos;
1370  }
1371 
1372  if (!data && length != EBML_UNKNOWN_LENGTH)
1373  goto skip;
1374  }
1375 
1376  switch (syntax->type) {
1377  case EBML_UINT:
1378  res = ebml_read_uint(pb, length, data);
1379  break;
1380  case EBML_SINT:
1381  res = ebml_read_sint(pb, length, data);
1382  break;
1383  case EBML_FLOAT:
1384  res = ebml_read_float(pb, length, data);
1385  break;
1386  case EBML_STR:
1387  case EBML_UTF8:
1388  res = ebml_read_ascii(pb, length, data);
1389  break;
1390  case EBML_BIN:
1391  res = ebml_read_binary(pb, length, pos_alt, data);
1392  break;
1393  case EBML_LEVEL1:
1394  case EBML_NEST:
1395  if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1396  return res;
1397  if (id == MATROSKA_ID_SEGMENT)
1398  matroska->segment_start = pos_alt;
1399  if (id == MATROSKA_ID_CUES)
1400  matroska->cues_parsing_deferred = 0;
1401  if (syntax->type == EBML_LEVEL1 &&
1402  (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1403  if (!level1_elem->pos) {
1404  // Zero is not a valid position for a level 1 element.
1405  level1_elem->pos = pos;
1406  } else if (level1_elem->pos != pos)
1407  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1408  level1_elem->parsed = 1;
1409  }
1410  if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1411  return res;
1412  break;
1413  case EBML_STOP:
1414  return 1;
1415  skip:
1416  default:
1417  if (length) {
1418  int64_t res2;
1419  if (ffio_limit(pb, length) != length) {
1420  // ffio_limit emits its own error message,
1421  // so we don't have to.
1422  return AVERROR(EIO);
1423  }
1424  if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1425  // avio_skip might take us past EOF. We check for this
1426  // by skipping only length - 1 bytes, reading a byte and
1427  // checking the error flags. This is done in order to check
1428  // that the element has been properly skipped even when
1429  // no filesize (that ffio_limit relies on) is available.
1430  avio_r8(pb);
1431  res = NEEDS_CHECKING;
1432  } else
1433  res = res2;
1434  } else
1435  res = 0;
1436  }
1437  if (res) {
1438  if (res == NEEDS_CHECKING) {
1439  if (pb->eof_reached) {
1440  if (pb->error)
1441  res = pb->error;
1442  else
1443  res = AVERROR_EOF;
1444  } else
1445  goto level_check;
1446  }
1447 
1448  if (res == AVERROR_INVALIDDATA)
1449  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1450  else if (res == AVERROR(EIO))
1451  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1452  else if (res == AVERROR_EOF) {
1453  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1454  res = AVERROR(EIO);
1455  }
1456 
1457  return res;
1458  }
1459 
1460 level_check:
1461  if (level_check == LEVEL_ENDED && matroska->num_levels) {
1462  level = &matroska->levels[matroska->num_levels - 1];
1463  pos = avio_tell(pb);
1464 
1465  // Given that pos >= level->start no check for
1466  // level->length != EBML_UNKNOWN_LENGTH is necessary.
1467  while (matroska->num_levels && pos == level->start + level->length) {
1468  matroska->num_levels--;
1469  level--;
1470  }
1471  }
1472 
1473  return level_check;
1474 }
1475 
1476 static void ebml_free(EbmlSyntax *syntax, void *data)
1477 {
1478  int i, j;
1479  for (i = 0; syntax[i].id; i++) {
1480  void *data_off = (char *) data + syntax[i].data_offset;
1481  switch (syntax[i].type) {
1482  case EBML_STR:
1483  case EBML_UTF8:
1484  av_freep(data_off);
1485  break;
1486  case EBML_BIN:
1487  av_buffer_unref(&((EbmlBin *) data_off)->buf);
1488  break;
1489  case EBML_LEVEL1:
1490  case EBML_NEST:
1491  if (syntax[i].list_elem_size) {
1492  EbmlList *list = data_off;
1493  char *ptr = list->elem;
1494  for (j = 0; j < list->nb_elem;
1495  j++, ptr += syntax[i].list_elem_size)
1496  ebml_free(syntax[i].def.n, ptr);
1497  av_freep(&list->elem);
1498  list->nb_elem = 0;
1499  list->alloc_elem_size = 0;
1500  } else
1501  ebml_free(syntax[i].def.n, data_off);
1502  default:
1503  break;
1504  }
1505  }
1506 }
1507 
1508 /*
1509  * Autodetecting...
1510  */
1511 static int matroska_probe(const AVProbeData *p)
1512 {
1513  uint64_t total = 0;
1514  int len_mask = 0x80, size = 1, n = 1, i;
1515 
1516  /* EBML header? */
1517  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1518  return 0;
1519 
1520  /* length of header */
1521  total = p->buf[4];
1522  while (size <= 8 && !(total & len_mask)) {
1523  size++;
1524  len_mask >>= 1;
1525  }
1526  if (size > 8)
1527  return 0;
1528  total &= (len_mask - 1);
1529  while (n < size)
1530  total = (total << 8) | p->buf[4 + n++];
1531 
1532  if (total + 1 == 1ULL << (7 * size)){
1533  /* Unknown-length header - simply parse the whole buffer. */
1534  total = p->buf_size - 4 - size;
1535  } else {
1536  /* Does the probe data contain the whole header? */
1537  if (p->buf_size < 4 + size + total)
1538  return 0;
1539  }
1540 
1541  /* The header should contain a known document type. For now,
1542  * we don't parse the whole header but simply check for the
1543  * availability of that array of characters inside the header.
1544  * Not fully fool-proof, but good enough. */
1545  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1546  size_t probelen = strlen(matroska_doctypes[i]);
1547  if (total < probelen)
1548  continue;
1549  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1550  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1551  return AVPROBE_SCORE_MAX;
1552  }
1553 
1554  // probably valid EBML header but no recognized doctype
1555  return AVPROBE_SCORE_EXTENSION;
1556 }
1557 
1559  int num)
1560 {
1561  MatroskaTrack *tracks = matroska->tracks.elem;
1562  int i;
1563 
1564  for (i = 0; i < matroska->tracks.nb_elem; i++)
1565  if (tracks[i].num == num)
1566  return &tracks[i];
1567 
1568  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1569  return NULL;
1570 }
1571 
1572 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1573  MatroskaTrack *track)
1574 {
1575  MatroskaTrackEncoding *encodings = track->encodings.elem;
1576  uint8_t *data = *buf;
1577  int isize = *buf_size;
1578  uint8_t *pkt_data = NULL;
1579  uint8_t av_unused *newpktdata;
1580  int pkt_size = isize;
1581  int result = 0;
1582  int olen;
1583 
1584  if (pkt_size >= 10000000U)
1585  return AVERROR_INVALIDDATA;
1586 
1587  switch (encodings[0].compression.algo) {
1589  {
1590  int header_size = encodings[0].compression.settings.size;
1591  uint8_t *header = encodings[0].compression.settings.data;
1592 
1593  if (header_size && !header) {
1594  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1595  return -1;
1596  }
1597 
1598  if (!header_size)
1599  return 0;
1600 
1601  pkt_size = isize + header_size;
1602  pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1603  if (!pkt_data)
1604  return AVERROR(ENOMEM);
1605 
1606  memcpy(pkt_data, header, header_size);
1607  memcpy(pkt_data + header_size, data, isize);
1608  break;
1609  }
1610 #if CONFIG_LZO
1612  do {
1613  olen = pkt_size *= 3;
1614  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1616  if (!newpktdata) {
1617  result = AVERROR(ENOMEM);
1618  goto failed;
1619  }
1620  pkt_data = newpktdata;
1621  result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1622  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1623  if (result) {
1624  result = AVERROR_INVALIDDATA;
1625  goto failed;
1626  }
1627  pkt_size -= olen;
1628  break;
1629 #endif
1630 #if CONFIG_ZLIB
1632  {
1633  z_stream zstream = { 0 };
1634  if (inflateInit(&zstream) != Z_OK)
1635  return -1;
1636  zstream.next_in = data;
1637  zstream.avail_in = isize;
1638  do {
1639  pkt_size *= 3;
1640  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1641  if (!newpktdata) {
1642  inflateEnd(&zstream);
1643  result = AVERROR(ENOMEM);
1644  goto failed;
1645  }
1646  pkt_data = newpktdata;
1647  zstream.avail_out = pkt_size - zstream.total_out;
1648  zstream.next_out = pkt_data + zstream.total_out;
1649  result = inflate(&zstream, Z_NO_FLUSH);
1650  } while (result == Z_OK && pkt_size < 10000000);
1651  pkt_size = zstream.total_out;
1652  inflateEnd(&zstream);
1653  if (result != Z_STREAM_END) {
1654  if (result == Z_MEM_ERROR)
1655  result = AVERROR(ENOMEM);
1656  else
1657  result = AVERROR_INVALIDDATA;
1658  goto failed;
1659  }
1660  break;
1661  }
1662 #endif
1663 #if CONFIG_BZLIB
1665  {
1666  bz_stream bzstream = { 0 };
1667  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1668  return -1;
1669  bzstream.next_in = data;
1670  bzstream.avail_in = isize;
1671  do {
1672  pkt_size *= 3;
1673  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1674  if (!newpktdata) {
1675  BZ2_bzDecompressEnd(&bzstream);
1676  result = AVERROR(ENOMEM);
1677  goto failed;
1678  }
1679  pkt_data = newpktdata;
1680  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1681  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1682  result = BZ2_bzDecompress(&bzstream);
1683  } while (result == BZ_OK && pkt_size < 10000000);
1684  pkt_size = bzstream.total_out_lo32;
1685  BZ2_bzDecompressEnd(&bzstream);
1686  if (result != BZ_STREAM_END) {
1687  if (result == BZ_MEM_ERROR)
1688  result = AVERROR(ENOMEM);
1689  else
1690  result = AVERROR_INVALIDDATA;
1691  goto failed;
1692  }
1693  break;
1694  }
1695 #endif
1696  default:
1697  return AVERROR_INVALIDDATA;
1698  }
1699 
1700  memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1701 
1702  *buf = pkt_data;
1703  *buf_size = pkt_size;
1704  return 0;
1705 
1706 failed:
1707  av_free(pkt_data);
1708  return result;
1709 }
1710 
1712  AVDictionary **metadata, char *prefix)
1713 {
1714  MatroskaTag *tags = list->elem;
1715  char key[1024];
1716  int i;
1717 
1718  for (i = 0; i < list->nb_elem; i++) {
1719  const char *lang = tags[i].lang &&
1720  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1721 
1722  if (!tags[i].name) {
1723  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1724  continue;
1725  }
1726  if (prefix)
1727  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1728  else
1729  av_strlcpy(key, tags[i].name, sizeof(key));
1730  if (tags[i].def || !lang) {
1731  av_dict_set(metadata, key, tags[i].string, 0);
1732  if (tags[i].sub.nb_elem)
1733  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1734  }
1735  if (lang) {
1736  av_strlcat(key, "-", sizeof(key));
1737  av_strlcat(key, lang, sizeof(key));
1738  av_dict_set(metadata, key, tags[i].string, 0);
1739  if (tags[i].sub.nb_elem)
1740  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1741  }
1742  }
1744 }
1745 
1747 {
1748  MatroskaDemuxContext *matroska = s->priv_data;
1749  MatroskaTags *tags = matroska->tags.elem;
1750  int i, j;
1751 
1752  for (i = 0; i < matroska->tags.nb_elem; i++) {
1753  if (tags[i].target.attachuid) {
1754  MatroskaAttachment *attachment = matroska->attachments.elem;
1755  int found = 0;
1756  for (j = 0; j < matroska->attachments.nb_elem; j++) {
1757  if (attachment[j].uid == tags[i].target.attachuid &&
1758  attachment[j].stream) {
1759  matroska_convert_tag(s, &tags[i].tag,
1760  &attachment[j].stream->metadata, NULL);
1761  found = 1;
1762  }
1763  }
1764  if (!found) {
1766  "The tags at index %d refer to a "
1767  "non-existent attachment %"PRId64".\n",
1768  i, tags[i].target.attachuid);
1769  }
1770  } else if (tags[i].target.chapteruid) {
1771  MatroskaChapter *chapter = matroska->chapters.elem;
1772  int found = 0;
1773  for (j = 0; j < matroska->chapters.nb_elem; j++) {
1774  if (chapter[j].uid == tags[i].target.chapteruid &&
1775  chapter[j].chapter) {
1776  matroska_convert_tag(s, &tags[i].tag,
1777  &chapter[j].chapter->metadata, NULL);
1778  found = 1;
1779  }
1780  }
1781  if (!found) {
1783  "The tags at index %d refer to a non-existent chapter "
1784  "%"PRId64".\n",
1785  i, tags[i].target.chapteruid);
1786  }
1787  } else if (tags[i].target.trackuid) {
1788  MatroskaTrack *track = matroska->tracks.elem;
1789  int found = 0;
1790  for (j = 0; j < matroska->tracks.nb_elem; j++) {
1791  if (track[j].uid == tags[i].target.trackuid &&
1792  track[j].stream) {
1793  matroska_convert_tag(s, &tags[i].tag,
1794  &track[j].stream->metadata, NULL);
1795  found = 1;
1796  }
1797  }
1798  if (!found) {
1800  "The tags at index %d refer to a non-existent track "
1801  "%"PRId64".\n",
1802  i, tags[i].target.trackuid);
1803  }
1804  } else {
1805  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1806  tags[i].target.type);
1807  }
1808  }
1809 }
1810 
1812  int64_t pos)
1813 {
1814  uint32_t saved_id = matroska->current_id;
1815  int64_t before_pos = avio_tell(matroska->ctx->pb);
1816  int ret = 0;
1817 
1818  /* seek */
1819  if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1820  /* We don't want to lose our seekhead level, so we add
1821  * a dummy. This is a crude hack. */
1822  if (matroska->num_levels == EBML_MAX_DEPTH) {
1823  av_log(matroska->ctx, AV_LOG_INFO,
1824  "Max EBML element depth (%d) reached, "
1825  "cannot parse further.\n", EBML_MAX_DEPTH);
1826  ret = AVERROR_INVALIDDATA;
1827  } else {
1828  matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1829  matroska->num_levels++;
1830  matroska->current_id = 0;
1831 
1832  ret = ebml_parse(matroska, matroska_segment, matroska);
1833  if (ret == LEVEL_ENDED) {
1834  /* This can only happen if the seek brought us beyond EOF. */
1835  ret = AVERROR_EOF;
1836  }
1837  }
1838  }
1839  /* Seek back - notice that in all instances where this is used
1840  * it is safe to set the level to 1. */
1841  matroska_reset_status(matroska, saved_id, before_pos);
1842 
1843  return ret;
1844 }
1845 
1847 {
1848  EbmlList *seekhead_list = &matroska->seekhead;
1849  int i;
1850 
1851  // we should not do any seeking in the streaming case
1852  if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1853  return;
1854 
1855  for (i = 0; i < seekhead_list->nb_elem; i++) {
1856  MatroskaSeekhead *seekheads = seekhead_list->elem;
1857  uint32_t id = seekheads[i].id;
1858  int64_t pos = seekheads[i].pos + matroska->segment_start;
1859 
1860  MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1861  if (!elem || elem->parsed)
1862  continue;
1863 
1864  elem->pos = pos;
1865 
1866  // defer cues parsing until we actually need cue data.
1867  if (id == MATROSKA_ID_CUES)
1868  continue;
1869 
1870  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1871  // mark index as broken
1872  matroska->cues_parsing_deferred = -1;
1873  break;
1874  }
1875 
1876  elem->parsed = 1;
1877  }
1878 }
1879 
1881 {
1882  EbmlList *index_list;
1884  uint64_t index_scale = 1;
1885  int i, j;
1886 
1887  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1888  return;
1889 
1890  index_list = &matroska->index;
1891  index = index_list->elem;
1892  if (index_list->nb_elem < 2)
1893  return;
1894  if (index[1].time > 1E14 / matroska->time_scale) {
1895  av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1896  return;
1897  }
1898  for (i = 0; i < index_list->nb_elem; i++) {
1899  EbmlList *pos_list = &index[i].pos;
1900  MatroskaIndexPos *pos = pos_list->elem;
1901  for (j = 0; j < pos_list->nb_elem; j++) {
1902  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1903  pos[j].track);
1904  if (track && track->stream)
1905  av_add_index_entry(track->stream,
1906  pos[j].pos + matroska->segment_start,
1907  index[i].time / index_scale, 0, 0,
1909  }
1910  }
1911 }
1912 
1914  int i;
1915 
1916  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1917  return;
1918 
1919  for (i = 0; i < matroska->num_level1_elems; i++) {
1920  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1921  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1922  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1923  matroska->cues_parsing_deferred = -1;
1924  elem->parsed = 1;
1925  break;
1926  }
1927  }
1928 
1929  matroska_add_index_entries(matroska);
1930 }
1931 
1933 {
1934  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1935  int profile;
1936 
1937  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1938  if (strstr(codec_id, aac_profiles[profile]))
1939  break;
1940  return profile + 1;
1941 }
1942 
1943 static int matroska_aac_sri(int samplerate)
1944 {
1945  int sri;
1946 
1947  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1948  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1949  break;
1950  return sri;
1951 }
1952 
1953 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1954 {
1955  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1956  avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1957 }
1958 
1960  MatroskaTrack *track,
1961  int *offset)
1962 {
1963  AVStream *st = track->stream;
1964  uint8_t *p = track->codec_priv.data;
1965  int size = track->codec_priv.size;
1966 
1967  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1968  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1969  track->codec_priv.size = 0;
1970  return 0;
1971  }
1972  *offset = 8;
1973  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1974 
1975  p += track->codec_priv.size;
1976  size -= track->codec_priv.size;
1977 
1978  /* parse the remaining metadata blocks if present */
1979  while (size >= 4) {
1980  int block_last, block_type, block_size;
1981 
1982  flac_parse_block_header(p, &block_last, &block_type, &block_size);
1983 
1984  p += 4;
1985  size -= 4;
1986  if (block_size > size)
1987  return 0;
1988 
1989  /* check for the channel mask */
1990  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1991  AVDictionary *dict = NULL;
1992  AVDictionaryEntry *chmask;
1993 
1994  ff_vorbis_comment(s, &dict, p, block_size, 0);
1995  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1996  if (chmask) {
1997  uint64_t mask = strtol(chmask->value, NULL, 0);
1998  if (!mask || mask & ~0x3ffffULL) {
2000  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2001  } else
2002  st->codecpar->channel_layout = mask;
2003  }
2004  av_dict_free(&dict);
2005  }
2006 
2007  p += block_size;
2008  size -= block_size;
2009  }
2010 
2011  return 0;
2012 }
2013 
2014 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2015 {
2016  int major, minor, micro, bttb = 0;
2017 
2018  /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2019  * this function, and fixed in 57.52 */
2020  if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, &micro) == 3)
2021  bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
2022 
2023  switch (field_order) {
2025  return AV_FIELD_PROGRESSIVE;
2027  return AV_FIELD_UNKNOWN;
2029  return AV_FIELD_TT;
2031  return AV_FIELD_BB;
2033  return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2035  return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2036  default:
2037  return AV_FIELD_UNKNOWN;
2038  }
2039 }
2040 
2041 static void mkv_stereo_mode_display_mul(int stereo_mode,
2042  int *h_width, int *h_height)
2043 {
2044  switch (stereo_mode) {
2050  break;
2055  *h_width = 2;
2056  break;
2061  *h_height = 2;
2062  break;
2063  }
2064 }
2065 
2066 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2067  const MatroskaTrackVideoColor *color = track->video.color.elem;
2068  const MatroskaMasteringMeta *mastering_meta;
2069  int has_mastering_primaries, has_mastering_luminance;
2070 
2071  if (!track->video.color.nb_elem)
2072  return 0;
2073 
2074  mastering_meta = &color->mastering_meta;
2075  // Mastering primaries are CIE 1931 coords, and must be > 0.
2076  has_mastering_primaries =
2077  mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2078  mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2079  mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2080  mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2081  has_mastering_luminance = mastering_meta->max_luminance > 0;
2082 
2085  if (color->primaries != AVCOL_PRI_RESERVED &&
2086  color->primaries != AVCOL_PRI_RESERVED0)
2087  st->codecpar->color_primaries = color->primaries;
2091  if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2092  color->range <= AVCOL_RANGE_JPEG)
2093  st->codecpar->color_range = color->range;
2098  st->codecpar->chroma_location =
2100  (color->chroma_siting_vert - 1) << 7);
2101  }
2102  if (color->max_cll && color->max_fall) {
2103  size_t size = 0;
2104  int ret;
2106  if (!metadata)
2107  return AVERROR(ENOMEM);
2109  (uint8_t *)metadata, size);
2110  if (ret < 0) {
2111  av_freep(&metadata);
2112  return ret;
2113  }
2114  metadata->MaxCLL = color->max_cll;
2115  metadata->MaxFALL = color->max_fall;
2116  }
2117 
2118  if (has_mastering_primaries || has_mastering_luminance) {
2119  AVMasteringDisplayMetadata *metadata =
2122  sizeof(AVMasteringDisplayMetadata));
2123  if (!metadata) {
2124  return AVERROR(ENOMEM);
2125  }
2126  memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2127  if (has_mastering_primaries) {
2128  metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2129  metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2130  metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2131  metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2132  metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2133  metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2134  metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2135  metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2136  metadata->has_primaries = 1;
2137  }
2138  if (has_mastering_luminance) {
2139  metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2140  metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2141  metadata->has_luminance = 1;
2142  }
2143  }
2144  return 0;
2145 }
2146 
2147 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track) {
2148  AVSphericalMapping *spherical;
2149  enum AVSphericalProjection projection;
2150  size_t spherical_size;
2151  uint32_t l = 0, t = 0, r = 0, b = 0;
2152  uint32_t padding = 0;
2153  int ret;
2154  GetByteContext gb;
2155 
2157  track->video.projection.private.size);
2158 
2159  if (bytestream2_get_byte(&gb) != 0) {
2160  av_log(NULL, AV_LOG_WARNING, "Unknown spherical metadata\n");
2161  return 0;
2162  }
2163 
2164  bytestream2_skip(&gb, 3); // flags
2165 
2166  switch (track->video.projection.type) {
2168  if (track->video.projection.private.size == 20) {
2169  t = bytestream2_get_be32(&gb);
2170  b = bytestream2_get_be32(&gb);
2171  l = bytestream2_get_be32(&gb);
2172  r = bytestream2_get_be32(&gb);
2173 
2174  if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2176  "Invalid bounding rectangle coordinates "
2177  "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2178  l, t, r, b);
2179  return AVERROR_INVALIDDATA;
2180  }
2181  } else if (track->video.projection.private.size != 0) {
2182  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2183  return AVERROR_INVALIDDATA;
2184  }
2185 
2186  if (l || t || r || b)
2187  projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2188  else
2189  projection = AV_SPHERICAL_EQUIRECTANGULAR;
2190  break;
2192  if (track->video.projection.private.size < 4) {
2193  av_log(NULL, AV_LOG_ERROR, "Missing projection private properties\n");
2194  return AVERROR_INVALIDDATA;
2195  } else if (track->video.projection.private.size == 12) {
2196  uint32_t layout = bytestream2_get_be32(&gb);
2197  if (layout) {
2199  "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2200  return 0;
2201  }
2202  projection = AV_SPHERICAL_CUBEMAP;
2203  padding = bytestream2_get_be32(&gb);
2204  } else {
2205  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2206  return AVERROR_INVALIDDATA;
2207  }
2208  break;
2210  /* No Spherical metadata */
2211  return 0;
2212  default:
2214  "Unknown spherical metadata type %"PRIu64"\n",
2215  track->video.projection.type);
2216  return 0;
2217  }
2218 
2219  spherical = av_spherical_alloc(&spherical_size);
2220  if (!spherical)
2221  return AVERROR(ENOMEM);
2222 
2223  spherical->projection = projection;
2224 
2225  spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2226  spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2227  spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2228 
2229  spherical->padding = padding;
2230 
2231  spherical->bound_left = l;
2232  spherical->bound_top = t;
2233  spherical->bound_right = r;
2234  spherical->bound_bottom = b;
2235 
2236  ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2237  spherical_size);
2238  if (ret < 0) {
2239  av_freep(&spherical);
2240  return ret;
2241  }
2242 
2243  return 0;
2244 }
2245 
2246 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2247 {
2248  const AVCodecTag *codec_tags;
2249 
2250  codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2252 
2253  /* Normalize noncompliant private data that starts with the fourcc
2254  * by expanding/shifting the data by 4 bytes and storing the data
2255  * size at the start. */
2256  if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2257  int ret = av_buffer_realloc(&track->codec_priv.buf,
2259  if (ret < 0)
2260  return ret;
2261 
2262  track->codec_priv.data = track->codec_priv.buf->data;
2263  memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2264  track->codec_priv.size += 4;
2265  AV_WB32(track->codec_priv.data, track->codec_priv.size);
2266  }
2267 
2268  *fourcc = AV_RL32(track->codec_priv.data + 4);
2269  *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2270 
2271  return 0;
2272 }
2273 
2275 {
2276  MatroskaDemuxContext *matroska = s->priv_data;
2277  MatroskaTrack *tracks = matroska->tracks.elem;
2278  AVStream *st;
2279  int i, j, ret;
2280  int k;
2281 
2282  for (i = 0; i < matroska->tracks.nb_elem; i++) {
2283  MatroskaTrack *track = &tracks[i];
2285  EbmlList *encodings_list = &track->encodings;
2286  MatroskaTrackEncoding *encodings = encodings_list->elem;
2287  uint8_t *extradata = NULL;
2288  int extradata_size = 0;
2289  int extradata_offset = 0;
2290  uint32_t fourcc = 0;
2291  AVIOContext b;
2292  char* key_id_base64 = NULL;
2293  int bit_depth = -1;
2294 
2295  /* Apply some sanity checks. */
2296  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2297  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2298  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2299  track->type != MATROSKA_TRACK_TYPE_METADATA) {
2300  av_log(matroska->ctx, AV_LOG_INFO,
2301  "Unknown or unsupported track type %"PRIu64"\n",
2302  track->type);
2303  continue;
2304  }
2305  if (!track->codec_id)
2306  continue;
2307 
2308  if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2309  isnan(track->audio.samplerate)) {
2310  av_log(matroska->ctx, AV_LOG_WARNING,
2311  "Invalid sample rate %f, defaulting to 8000 instead.\n",
2312  track->audio.samplerate);
2313  track->audio.samplerate = 8000;
2314  }
2315 
2316  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2317  if (!track->default_duration && track->video.frame_rate > 0) {
2318  double default_duration = 1000000000 / track->video.frame_rate;
2319  if (default_duration > UINT64_MAX || default_duration < 0) {
2320  av_log(matroska->ctx, AV_LOG_WARNING,
2321  "Invalid frame rate %e. Cannot calculate default duration.\n",
2322  track->video.frame_rate);
2323  } else {
2324  track->default_duration = default_duration;
2325  }
2326  }
2327  if (track->video.display_width == -1)
2328  track->video.display_width = track->video.pixel_width;
2329  if (track->video.display_height == -1)
2330  track->video.display_height = track->video.pixel_height;
2331  if (track->video.color_space.size == 4)
2332  fourcc = AV_RL32(track->video.color_space.data);
2333  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2334  if (!track->audio.out_samplerate)
2335  track->audio.out_samplerate = track->audio.samplerate;
2336  }
2337  if (encodings_list->nb_elem > 1) {
2338  av_log(matroska->ctx, AV_LOG_ERROR,
2339  "Multiple combined encodings not supported");
2340  } else if (encodings_list->nb_elem == 1) {
2341  if (encodings[0].type) {
2342  if (encodings[0].encryption.key_id.size > 0) {
2343  /* Save the encryption key id to be stored later as a
2344  metadata tag. */
2345  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2346  key_id_base64 = av_malloc(b64_size);
2347  if (key_id_base64 == NULL)
2348  return AVERROR(ENOMEM);
2349 
2350  av_base64_encode(key_id_base64, b64_size,
2351  encodings[0].encryption.key_id.data,
2352  encodings[0].encryption.key_id.size);
2353  } else {
2354  encodings[0].scope = 0;
2355  av_log(matroska->ctx, AV_LOG_ERROR,
2356  "Unsupported encoding type");
2357  }
2358  } else if (
2359 #if CONFIG_ZLIB
2360  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2361 #endif
2362 #if CONFIG_BZLIB
2364 #endif
2365 #if CONFIG_LZO
2367 #endif
2369  encodings[0].scope = 0;
2370  av_log(matroska->ctx, AV_LOG_ERROR,
2371  "Unsupported encoding type");
2372  } else if (track->codec_priv.size && encodings[0].scope & 2) {
2373  uint8_t *codec_priv = track->codec_priv.data;
2374  int ret = matroska_decode_buffer(&track->codec_priv.data,
2375  &track->codec_priv.size,
2376  track);
2377  if (ret < 0) {
2378  track->codec_priv.data = NULL;
2379  track->codec_priv.size = 0;
2380  av_log(matroska->ctx, AV_LOG_ERROR,
2381  "Failed to decode codec private data\n");
2382  }
2383 
2384  if (codec_priv != track->codec_priv.data) {
2385  av_buffer_unref(&track->codec_priv.buf);
2386  if (track->codec_priv.data) {
2387  track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2389  NULL, NULL, 0);
2390  if (!track->codec_priv.buf) {
2391  av_freep(&track->codec_priv.data);
2392  track->codec_priv.size = 0;
2393  return AVERROR(ENOMEM);
2394  }
2395  }
2396  }
2397  }
2398  }
2399 
2400  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2401  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2402  strlen(ff_mkv_codec_tags[j].str))) {
2403  codec_id = ff_mkv_codec_tags[j].id;
2404  break;
2405  }
2406  }
2407 
2408  st = track->stream = avformat_new_stream(s, NULL);
2409  if (!st) {
2410  av_free(key_id_base64);
2411  return AVERROR(ENOMEM);
2412  }
2413 
2414  if (key_id_base64) {
2415  /* export encryption key id as base64 metadata tag */
2416  av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
2417  av_freep(&key_id_base64);
2418  }
2419 
2420  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2421  track->codec_priv.size >= 40 &&
2422  track->codec_priv.data) {
2423  track->ms_compat = 1;
2424  bit_depth = AV_RL16(track->codec_priv.data + 14);
2425  fourcc = AV_RL32(track->codec_priv.data + 16);
2427  fourcc);
2428  if (!codec_id)
2430  fourcc);
2431  extradata_offset = 40;
2432  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2433  track->codec_priv.size >= 14 &&
2434  track->codec_priv.data) {
2435  int ret;
2436  ffio_init_context(&b, track->codec_priv.data,
2437  track->codec_priv.size,
2438  0, NULL, NULL, NULL, NULL);
2439  ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2440  if (ret < 0)
2441  return ret;
2442  codec_id = st->codecpar->codec_id;
2443  fourcc = st->codecpar->codec_tag;
2444  extradata_offset = FFMIN(track->codec_priv.size, 18);
2445  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2446  /* Normally 36, but allow noncompliant private data */
2447  && (track->codec_priv.size >= 32)
2448  && (track->codec_priv.data)) {
2449  uint16_t sample_size;
2450  int ret = get_qt_codec(track, &fourcc, &codec_id);
2451  if (ret < 0)
2452  return ret;
2453  sample_size = AV_RB16(track->codec_priv.data + 26);
2454  if (fourcc == 0) {
2455  if (sample_size == 8) {
2456  fourcc = MKTAG('r','a','w',' ');
2457  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2458  } else if (sample_size == 16) {
2459  fourcc = MKTAG('t','w','o','s');
2460  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2461  }
2462  }
2463  if ((fourcc == MKTAG('t','w','o','s') ||
2464  fourcc == MKTAG('s','o','w','t')) &&
2465  sample_size == 8)
2466  codec_id = AV_CODEC_ID_PCM_S8;
2467  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2468  (track->codec_priv.size >= 21) &&
2469  (track->codec_priv.data)) {
2470  int ret = get_qt_codec(track, &fourcc, &codec_id);
2471  if (ret < 0)
2472  return ret;
2473  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2474  fourcc = MKTAG('S','V','Q','3');
2475  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2476  }
2477  if (codec_id == AV_CODEC_ID_NONE)
2478  av_log(matroska->ctx, AV_LOG_ERROR,
2479  "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2480  if (track->codec_priv.size >= 86) {
2481  bit_depth = AV_RB16(track->codec_priv.data + 82);
2482  ffio_init_context(&b, track->codec_priv.data,
2483  track->codec_priv.size,
2484  0, NULL, NULL, NULL, NULL);
2485  if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2486  bit_depth &= 0x1F;
2487  track->has_palette = 1;
2488  }
2489  }
2490  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2491  switch (track->audio.bitdepth) {
2492  case 8:
2493  codec_id = AV_CODEC_ID_PCM_U8;
2494  break;
2495  case 24:
2496  codec_id = AV_CODEC_ID_PCM_S24BE;
2497  break;
2498  case 32:
2499  codec_id = AV_CODEC_ID_PCM_S32BE;
2500  break;
2501  }
2502  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2503  switch (track->audio.bitdepth) {
2504  case 8:
2505  codec_id = AV_CODEC_ID_PCM_U8;
2506  break;
2507  case 24:
2508  codec_id = AV_CODEC_ID_PCM_S24LE;
2509  break;
2510  case 32:
2511  codec_id = AV_CODEC_ID_PCM_S32LE;
2512  break;
2513  }
2514  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2515  track->audio.bitdepth == 64) {
2516  codec_id = AV_CODEC_ID_PCM_F64LE;
2517  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2518  int profile = matroska_aac_profile(track->codec_id);
2519  int sri = matroska_aac_sri(track->audio.samplerate);
2520  extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2521  if (!extradata)
2522  return AVERROR(ENOMEM);
2523  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2524  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2525  if (strstr(track->codec_id, "SBR")) {
2526  sri = matroska_aac_sri(track->audio.out_samplerate);
2527  extradata[2] = 0x56;
2528  extradata[3] = 0xE5;
2529  extradata[4] = 0x80 | (sri << 3);
2530  extradata_size = 5;
2531  } else
2532  extradata_size = 2;
2533  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2534  /* Only ALAC's magic cookie is stored in Matroska's track headers.
2535  * Create the "atom size", "tag", and "tag version" fields the
2536  * decoder expects manually. */
2537  extradata_size = 12 + track->codec_priv.size;
2538  extradata = av_mallocz(extradata_size +
2540  if (!extradata)
2541  return AVERROR(ENOMEM);
2542  AV_WB32(extradata, extradata_size);
2543  memcpy(&extradata[4], "alac", 4);
2544  AV_WB32(&extradata[8], 0);
2545  memcpy(&extradata[12], track->codec_priv.data,
2546  track->codec_priv.size);
2547  } else if (codec_id == AV_CODEC_ID_TTA) {
2548  extradata_size = 30;
2549  extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2550  if (!extradata)
2551  return AVERROR(ENOMEM);
2552  ffio_init_context(&b, extradata, extradata_size, 1,
2553  NULL, NULL, NULL, NULL);
2554  avio_write(&b, "TTA1", 4);
2555  avio_wl16(&b, 1);
2556  if (track->audio.channels > UINT16_MAX ||
2557  track->audio.bitdepth > UINT16_MAX) {
2558  av_log(matroska->ctx, AV_LOG_WARNING,
2559  "Too large audio channel number %"PRIu64
2560  " or bitdepth %"PRIu64". Skipping track.\n",
2561  track->audio.channels, track->audio.bitdepth);
2562  av_freep(&extradata);
2563  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2564  return AVERROR_INVALIDDATA;
2565  else
2566  continue;
2567  }
2568  avio_wl16(&b, track->audio.channels);
2569  avio_wl16(&b, track->audio.bitdepth);
2570  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2571  return AVERROR_INVALIDDATA;
2572  avio_wl32(&b, track->audio.out_samplerate);
2573  avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
2574  track->audio.out_samplerate,
2575  AV_TIME_BASE * 1000));
2576  } else if (codec_id == AV_CODEC_ID_RV10 ||
2577  codec_id == AV_CODEC_ID_RV20 ||
2578  codec_id == AV_CODEC_ID_RV30 ||
2579  codec_id == AV_CODEC_ID_RV40) {
2580  extradata_offset = 26;
2581  } else if (codec_id == AV_CODEC_ID_RA_144) {
2582  track->audio.out_samplerate = 8000;
2583  track->audio.channels = 1;
2584  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2585  codec_id == AV_CODEC_ID_COOK ||
2586  codec_id == AV_CODEC_ID_ATRAC3 ||
2587  codec_id == AV_CODEC_ID_SIPR)
2588  && track->codec_priv.data) {
2589  int flavor;
2590 
2591  ffio_init_context(&b, track->codec_priv.data,
2592  track->codec_priv.size,
2593  0, NULL, NULL, NULL, NULL);
2594  avio_skip(&b, 22);
2595  flavor = avio_rb16(&b);
2596  track->audio.coded_framesize = avio_rb32(&b);
2597  avio_skip(&b, 12);
2598  track->audio.sub_packet_h = avio_rb16(&b);
2599  track->audio.frame_size = avio_rb16(&b);
2600  track->audio.sub_packet_size = avio_rb16(&b);
2601  if (flavor < 0 ||
2602  track->audio.coded_framesize <= 0 ||
2603  track->audio.sub_packet_h <= 0 ||
2604  track->audio.frame_size <= 0 ||
2605  track->audio.sub_packet_size <= 0 && codec_id != AV_CODEC_ID_SIPR)
2606  return AVERROR_INVALIDDATA;
2607  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2608  track->audio.frame_size);
2609  if (!track->audio.buf)
2610  return AVERROR(ENOMEM);
2611  if (codec_id == AV_CODEC_ID_RA_288) {
2612  st->codecpar->block_align = track->audio.coded_framesize;
2613  track->codec_priv.size = 0;
2614  } else {
2615  if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2616  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2617  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2618  st->codecpar->bit_rate = sipr_bit_rate[flavor];
2619  }
2620  st->codecpar->block_align = track->audio.sub_packet_size;
2621  extradata_offset = 78;
2622  }
2623  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2624  ret = matroska_parse_flac(s, track, &extradata_offset);
2625  if (ret < 0)
2626  return ret;
2627  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2628  fourcc = AV_RL32(track->codec_priv.data);
2629  } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2630  /* we don't need any value stored in CodecPrivate.
2631  make sure that it's not exported as extradata. */
2632  track->codec_priv.size = 0;
2633  } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2634  /* For now, propagate only the OBUs, if any. Once libavcodec is
2635  updated to handle isobmff style extradata this can be removed. */
2636  extradata_offset = 4;
2637  }
2638  track->codec_priv.size -= extradata_offset;
2639 
2640  if (codec_id == AV_CODEC_ID_NONE)
2641  av_log(matroska->ctx, AV_LOG_INFO,
2642  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2643 
2644  if (track->time_scale < 0.01)
2645  track->time_scale = 1.0;
2646  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2647  1000 * 1000 * 1000); /* 64 bit pts in ns */
2648 
2649  /* convert the delay from ns to the track timebase */
2651  (AVRational){ 1, 1000000000 },
2652  st->time_base);
2653 
2654  st->codecpar->codec_id = codec_id;
2655 
2656  if (strcmp(track->language, "und"))
2657  av_dict_set(&st->metadata, "language", track->language, 0);
2658  av_dict_set(&st->metadata, "title", track->name, 0);
2659 
2660  if (track->flag_default)
2662  if (track->flag_forced)
2664 
2665  if (!st->codecpar->extradata) {
2666  if (extradata) {
2667  st->codecpar->extradata = extradata;
2668  st->codecpar->extradata_size = extradata_size;
2669  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2670  if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2671  return AVERROR(ENOMEM);
2672  memcpy(st->codecpar->extradata,
2673  track->codec_priv.data + extradata_offset,
2674  track->codec_priv.size);
2675  }
2676  }
2677 
2678  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2680  int display_width_mul = 1;
2681  int display_height_mul = 1;
2682 
2684  st->codecpar->codec_tag = fourcc;
2685  if (bit_depth >= 0)
2687  st->codecpar->width = track->video.pixel_width;
2688  st->codecpar->height = track->video.pixel_height;
2689 
2691  st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2694 
2696  mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2697 
2700  &st->sample_aspect_ratio.den,
2701  st->codecpar->height * track->video.display_width * display_width_mul,
2702  st->codecpar->width * track->video.display_height * display_height_mul,
2703  255);
2704  }
2705  if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2707 
2708  if (track->default_duration) {
2710  1000000000, track->default_duration, 30000);
2711 #if FF_API_R_FRAME_RATE
2712  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2713  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2714  st->r_frame_rate = st->avg_frame_rate;
2715 #endif
2716  }
2717 
2718  /* export stereo mode flag as metadata tag */
2720  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2721 
2722  /* export alpha mode flag as metadata tag */
2723  if (track->video.alpha_mode)
2724  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2725 
2726  /* if we have virtual track, mark the real tracks */
2727  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2728  char buf[32];
2729  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2730  continue;
2731  snprintf(buf, sizeof(buf), "%s_%d",
2732  ff_matroska_video_stereo_plane[planes[j].type], i);
2733  for (k=0; k < matroska->tracks.nb_elem; k++)
2734  if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2735  av_dict_set(&tracks[k].stream->metadata,
2736  "stereo_mode", buf, 0);
2737  break;
2738  }
2739  }
2740  // add stream level stereo3d side data if it is a supported format
2742  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2743  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2744  if (ret < 0)
2745  return ret;
2746  }
2747 
2748  ret = mkv_parse_video_color(st, track);
2749  if (ret < 0)
2750  return ret;
2751  ret = mkv_parse_video_projection(st, track);
2752  if (ret < 0)
2753  return ret;
2754  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2756  st->codecpar->codec_tag = fourcc;
2757  st->codecpar->sample_rate = track->audio.out_samplerate;
2758  st->codecpar->channels = track->audio.channels;
2759  if (!st->codecpar->bits_per_coded_sample)
2761  if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2762  st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2765  else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2767  if (track->codec_delay > 0) {
2769  (AVRational){1, 1000000000},
2770  (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2771  48000 : st->codecpar->sample_rate});
2772  }
2773  if (track->seek_preroll > 0) {
2775  (AVRational){1, 1000000000},
2776  (AVRational){1, st->codecpar->sample_rate});
2777  }
2778  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2780 
2781  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2783  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2785  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2787  }
2788  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2790  }
2791  }
2792 
2793  return 0;
2794 }
2795 
2797 {
2798  MatroskaDemuxContext *matroska = s->priv_data;
2799  EbmlList *attachments_list = &matroska->attachments;
2800  EbmlList *chapters_list = &matroska->chapters;
2801  MatroskaAttachment *attachments;
2802  MatroskaChapter *chapters;
2803  uint64_t max_start = 0;
2804  int64_t pos;
2805  Ebml ebml = { 0 };
2806  int i, j, res;
2807 
2808  matroska->ctx = s;
2809  matroska->cues_parsing_deferred = 1;
2810 
2811  /* First read the EBML header. */
2812  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2813  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2814  ebml_free(ebml_syntax, &ebml);
2815  return AVERROR_INVALIDDATA;
2816  }
2817  if (ebml.version > EBML_VERSION ||
2818  ebml.max_size > sizeof(uint64_t) ||
2819  ebml.id_length > sizeof(uint32_t) ||
2820  ebml.doctype_version > 3) {
2822  "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2823  ebml.version, ebml.doctype, ebml.doctype_version);
2824  ebml_free(ebml_syntax, &ebml);
2825  return AVERROR_PATCHWELCOME;
2826  } else if (ebml.doctype_version == 3) {
2827  av_log(matroska->ctx, AV_LOG_WARNING,
2828  "EBML header using unsupported features\n"
2829  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2830  ebml.version, ebml.doctype, ebml.doctype_version);
2831  }
2832  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2833  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2834  break;
2835  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2836  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2837  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2838  ebml_free(ebml_syntax, &ebml);
2839  return AVERROR_INVALIDDATA;
2840  }
2841  }
2842  ebml_free(ebml_syntax, &ebml);
2843 
2844  /* The next thing is a segment. */
2845  pos = avio_tell(matroska->ctx->pb);
2846  res = ebml_parse(matroska, matroska_segments, matroska);
2847  // Try resyncing until we find an EBML_STOP type element.
2848  while (res != 1) {
2849  res = matroska_resync(matroska, pos);
2850  if (res < 0)
2851  goto fail;
2852  pos = avio_tell(matroska->ctx->pb);
2853  res = ebml_parse(matroska, matroska_segment, matroska);
2854  }
2855  /* Set data_offset as it might be needed later by seek_frame_generic. */
2856  if (matroska->current_id == MATROSKA_ID_CLUSTER)
2857  s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2858  matroska_execute_seekhead(matroska);
2859 
2860  if (!matroska->time_scale)
2861  matroska->time_scale = 1000000;
2862  if (matroska->duration)
2863  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2864  1000 / AV_TIME_BASE;
2865  av_dict_set(&s->metadata, "title", matroska->title, 0);
2866  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2867 
2868  if (matroska->date_utc.size == 8)
2870 
2871  res = matroska_parse_tracks(s);
2872  if (res < 0)
2873  goto fail;
2874 
2875  attachments = attachments_list->elem;
2876  for (j = 0; j < attachments_list->nb_elem; j++) {
2877  if (!(attachments[j].filename && attachments[j].mime &&
2878  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2879  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2880  } else {
2881  AVStream *st = avformat_new_stream(s, NULL);
2882  if (!st)
2883  break;
2884  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2885  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2887 
2888  for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2889  if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2890  strlen(ff_mkv_image_mime_tags[i].str))) {
2892  break;
2893  }
2894  }
2895 
2896  attachments[j].stream = st;
2897 
2898  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2899  AVPacket *pkt = &st->attached_pic;
2900 
2903 
2904  av_init_packet(pkt);
2905  pkt->buf = av_buffer_ref(attachments[j].bin.buf);
2906  if (!pkt->buf)
2907  return AVERROR(ENOMEM);
2908  pkt->data = attachments[j].bin.data;
2909  pkt->size = attachments[j].bin.size;
2910  pkt->stream_index = st->index;
2911  pkt->flags |= AV_PKT_FLAG_KEY;
2912  } else {
2914  if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2915  break;
2916  memcpy(st->codecpar->extradata, attachments[j].bin.data,
2917  attachments[j].bin.size);
2918 
2919  for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2920  if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2921  strlen(ff_mkv_mime_tags[i].str))) {
2923  break;
2924  }
2925  }
2926  }
2927  }
2928  }
2929 
2930  chapters = chapters_list->elem;
2931  for (i = 0; i < chapters_list->nb_elem; i++)
2932  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2933  (max_start == 0 || chapters[i].start > max_start)) {
2934  chapters[i].chapter =
2935  avpriv_new_chapter(s, chapters[i].uid,
2936  (AVRational) { 1, 1000000000 },
2937  chapters[i].start, chapters[i].end,
2938  chapters[i].title);
2939  if (chapters[i].chapter) {
2940  av_dict_set(&chapters[i].chapter->metadata,
2941  "title", chapters[i].title, 0);
2942  }
2943  max_start = chapters[i].start;
2944  }
2945 
2946  matroska_add_index_entries(matroska);
2947 
2949 
2950  return 0;
2951 fail:
2953  return res;
2954 }
2955 
2956 /*
2957  * Put one packet in an application-supplied AVPacket struct.
2958  * Returns 0 on success or -1 on failure.
2959  */
2961  AVPacket *pkt)
2962 {
2963  if (matroska->queue) {
2964  MatroskaTrack *tracks = matroska->tracks.elem;
2965  MatroskaTrack *track;
2966 
2967  ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2968  track = &tracks[pkt->stream_index];
2969  if (track->has_palette) {
2971  if (!pal) {
2972  av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
2973  } else {
2974  memcpy(pal, track->palette, AVPALETTE_SIZE);
2975  }
2976  track->has_palette = 0;
2977  }
2978  return 0;
2979  }
2980 
2981  return -1;
2982 }
2983 
2984 /*
2985  * Free all packets in our internal queue.
2986  */
2988 {
2989  ff_packet_list_free(&matroska->queue, &matroska->queue_end);
2990 }
2991 
2993  int *buf_size, int type,
2994  uint32_t **lace_buf, int *laces)
2995 {
2996  int res = 0, n, size = *buf_size;
2997  uint8_t *data = *buf;
2998  uint32_t *lace_size;
2999 
3000  if (!type) {
3001  *laces = 1;
3002  *lace_buf = av_malloc(sizeof(**lace_buf));
3003  if (!*lace_buf)
3004  return AVERROR(ENOMEM);
3005 
3006  *lace_buf[0] = size;
3007  return 0;
3008  }
3009 
3010  av_assert0(size > 0);
3011  *laces = *data + 1;
3012  data += 1;
3013  size -= 1;
3014  lace_size = av_malloc_array(*laces, sizeof(*lace_size));
3015  if (!lace_size)
3016  return AVERROR(ENOMEM);
3017 
3018  switch (type) {
3019  case 0x1: /* Xiph lacing */
3020  {
3021  uint8_t temp;
3022  uint32_t total = 0;
3023  for (n = 0; res == 0 && n < *laces - 1; n++) {
3024  lace_size[n] = 0;
3025 
3026  while (1) {
3027  if (size <= total) {
3028  res = AVERROR_INVALIDDATA;
3029  break;
3030  }
3031  temp = *data;
3032  total += temp;
3033  lace_size[n] += temp;
3034  data += 1;
3035  size -= 1;
3036  if (temp != 0xff)
3037  break;
3038  }
3039  }
3040  if (size <= total) {
3041  res = AVERROR_INVALIDDATA;
3042  break;
3043  }
3044 
3045  lace_size[n] = size - total;
3046  break;
3047  }
3048 
3049  case 0x2: /* fixed-size lacing */
3050  if (size % (*laces)) {
3051  res = AVERROR_INVALIDDATA;
3052  break;
3053  }
3054  for (n = 0; n < *laces; n++)
3055  lace_size[n] = size / *laces;
3056  break;
3057 
3058  case 0x3: /* EBML lacing */
3059  {
3060  uint64_t num;
3061  uint64_t total;
3062  n = matroska_ebmlnum_uint(matroska, data, size, &num);
3063  if (n < 0 || num > INT_MAX) {
3064  av_log(matroska->ctx, AV_LOG_INFO,
3065  "EBML block data error\n");
3066  res = n<0 ? n : AVERROR_INVALIDDATA;
3067  break;
3068  }
3069  data += n;
3070  size -= n;
3071  total = lace_size[0] = num;
3072  for (n = 1; res == 0 && n < *laces - 1; n++) {
3073  int64_t snum;
3074  int r;
3075  r = matroska_ebmlnum_sint(matroska, data, size, &snum);
3076  if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
3077  av_log(matroska->ctx, AV_LOG_INFO,
3078  "EBML block data error\n");
3079  res = r<0 ? r : AVERROR_INVALIDDATA;
3080  break;
3081  }
3082  data += r;
3083  size -= r;
3084  lace_size[n] = lace_size[n - 1] + snum;
3085  total += lace_size[n];
3086  }
3087  if (size <= total) {
3088  res = AVERROR_INVALIDDATA;
3089  break;
3090  }
3091  lace_size[*laces - 1] = size - total;
3092  break;
3093  }
3094  }
3095 
3096  *buf = data;
3097  *lace_buf = lace_size;
3098  *buf_size = size;
3099 
3100  return res;
3101 }
3102 
3104  MatroskaTrack *track, AVStream *st,
3105  uint8_t *data, int size, uint64_t timecode,
3106  int64_t pos)
3107 {
3108  int a = st->codecpar->block_align;
3109  int sps = track->audio.sub_packet_size;
3110  int cfs = track->audio.coded_framesize;
3111  int h = track->audio.sub_packet_h;
3112  int y = track->audio.sub_packet_cnt;
3113  int w = track->audio.frame_size;
3114  int x;
3115 
3116  if (!track->audio.pkt_cnt) {
3117  if (track->audio.sub_packet_cnt == 0)
3118  track->audio.buf_timecode = timecode;
3119  if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3120  if (size < cfs * h / 2) {
3121  av_log(matroska->ctx, AV_LOG_ERROR,
3122  "Corrupt int4 RM-style audio packet size\n");
3123  return AVERROR_INVALIDDATA;
3124  }
3125  for (x = 0; x < h / 2; x++)
3126  memcpy(track->audio.buf + x * 2 * w + y * cfs,
3127  data + x * cfs, cfs);
3128  } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3129  if (size < w) {
3130  av_log(matroska->ctx, AV_LOG_ERROR,
3131  "Corrupt sipr RM-style audio packet size\n");
3132  return AVERROR_INVALIDDATA;
3133  }
3134  memcpy(track->audio.buf + y * w, data, w);
3135  } else {
3136  if (size < sps * w / sps || h<=0 || w%sps) {
3137  av_log(matroska->ctx, AV_LOG_ERROR,
3138  "Corrupt generic RM-style audio packet size\n");
3139  return AVERROR_INVALIDDATA;
3140  }
3141  for (x = 0; x < w / sps; x++)
3142  memcpy(track->audio.buf +
3143  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3144  data + x * sps, sps);
3145  }
3146 
3147  if (++track->audio.sub_packet_cnt >= h) {
3148  if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3149  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3150  track->audio.sub_packet_cnt = 0;
3151  track->audio.pkt_cnt = h * w / a;
3152  }
3153  }
3154 
3155  while (track->audio.pkt_cnt) {
3156  int ret;
3157  AVPacket pktl, *pkt = &pktl;
3158 
3159  ret = av_new_packet(pkt, a);
3160  if (ret < 0) {
3161  return ret;
3162  }
3163  memcpy(pkt->data,
3164  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3165  a);
3166  pkt->pts = track->audio.buf_timecode;
3168  pkt->pos = pos;
3169  pkt->stream_index = st->index;
3170  ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3171  if (ret < 0) {
3172  av_packet_unref(pkt);
3173  return AVERROR(ENOMEM);
3174  }
3175  }
3176 
3177  return 0;
3178 }
3179 
3180 /* reconstruct full wavpack blocks from mangled matroska ones */
3182  uint8_t **pdst, int *size)
3183 {
3184  uint8_t *dst = NULL;
3185  int dstlen = 0;
3186  int srclen = *size;
3187  uint32_t samples;
3188  uint16_t ver;
3189  int ret, offset = 0;
3190 
3191  if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
3192  return AVERROR_INVALIDDATA;
3193 
3194  ver = AV_RL16(track->stream->codecpar->extradata);
3195 
3196  samples = AV_RL32(src);
3197  src += 4;
3198  srclen -= 4;
3199 
3200  while (srclen >= 8) {
3201  int multiblock;
3202  uint32_t blocksize;
3203  uint8_t *tmp;
3204 
3205  uint32_t flags = AV_RL32(src);
3206  uint32_t crc = AV_RL32(src + 4);
3207  src += 8;
3208  srclen -= 8;
3209 
3210  multiblock = (flags & 0x1800) != 0x1800;
3211  if (multiblock) {
3212  if (srclen < 4) {
3213  ret = AVERROR_INVALIDDATA;
3214  goto fail;
3215  }
3216  blocksize = AV_RL32(src);
3217  src += 4;
3218  srclen -= 4;
3219  } else
3220  blocksize = srclen;
3221 
3222  if (blocksize > srclen) {
3223  ret = AVERROR_INVALIDDATA;
3224  goto fail;
3225  }
3226 
3227  tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3228  if (!tmp) {
3229  ret = AVERROR(ENOMEM);
3230  goto fail;
3231  }
3232  dst = tmp;
3233  dstlen += blocksize + 32;
3234 
3235  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3236  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3237  AV_WL16(dst + offset + 8, ver); // version
3238  AV_WL16(dst + offset + 10, 0); // track/index_no
3239  AV_WL32(dst + offset + 12, 0); // total samples
3240  AV_WL32(dst + offset + 16, 0); // block index
3241  AV_WL32(dst + offset + 20, samples); // number of samples
3242  AV_WL32(dst + offset + 24, flags); // flags
3243  AV_WL32(dst + offset + 28, crc); // crc
3244  memcpy(dst + offset + 32, src, blocksize); // block data
3245 
3246  src += blocksize;
3247  srclen -= blocksize;
3248  offset += blocksize + 32;
3249  }
3250 
3251  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3252 
3253  *pdst = dst;
3254  *size = dstlen;
3255 
3256  return 0;
3257 
3258 fail:
3259  av_freep(&dst);
3260  return ret;
3261 }
3262 
3264  uint8_t **pdst, int *size)
3265 {
3266  uint8_t *dst = src;
3267  int dstlen = *size;
3268 
3269  if (AV_RB32(&src[4]) != MKBETAG('i', 'c', 'p', 'f')) {
3270  dstlen += 8;
3271 
3272  dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3273  if (!dst)
3274  return AVERROR(ENOMEM);
3275 
3276  AV_WB32(dst, dstlen);
3277  AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3278  memcpy(dst + 8, src, dstlen - 8);
3279  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3280  }
3281 
3282  *pdst = dst;
3283  *size = dstlen;
3284 
3285  return 0;
3286 }
3287 
3289  MatroskaTrack *track,
3290  AVStream *st,
3291  uint8_t *data, int data_len,
3292  uint64_t timecode,
3293  uint64_t duration,
3294  int64_t pos)
3295 {
3296  AVPacket pktl, *pkt = &pktl;
3297  uint8_t *id, *settings, *text, *buf;
3298  int id_len, settings_len, text_len;
3299  uint8_t *p, *q;
3300  int err;
3301 
3302  if (data_len <= 0)
3303  return AVERROR_INVALIDDATA;
3304 
3305  p = data;
3306  q = data + data_len;
3307 
3308  id = p;
3309  id_len = -1;
3310  while (p < q) {
3311  if (*p == '\r' || *p == '\n') {
3312  id_len = p - id;
3313  if (*p == '\r')
3314  p++;
3315  break;
3316  }
3317  p++;
3318  }
3319 
3320  if (p >= q || *p != '\n')
3321  return AVERROR_INVALIDDATA;
3322  p++;
3323 
3324  settings = p;
3325  settings_len = -1;
3326  while (p < q) {
3327  if (*p == '\r' || *p == '\n') {
3328  settings_len = p - settings;
3329  if (*p == '\r')
3330  p++;
3331  break;
3332  }
3333  p++;
3334  }
3335 
3336  if (p >= q || *p != '\n')
3337  return AVERROR_INVALIDDATA;
3338  p++;
3339 
3340  text = p;
3341  text_len = q - p;
3342  while (text_len > 0) {
3343  const int len = text_len - 1;
3344  const uint8_t c = p[len];
3345  if (c != '\r' && c != '\n')
3346  break;
3347  text_len = len;
3348  }
3349 
3350  if (text_len <= 0)
3351  return AVERROR_INVALIDDATA;
3352 
3353  err = av_new_packet(pkt, text_len);
3354  if (err < 0) {
3355  return err;
3356  }
3357 
3358  memcpy(pkt->data, text, text_len);
3359 
3360  if (id_len > 0) {
3361  buf = av_packet_new_side_data(pkt,
3363  id_len);
3364  if (!buf) {
3365  av_packet_unref(pkt);
3366  return AVERROR(ENOMEM);
3367  }
3368  memcpy(buf, id, id_len);
3369  }
3370 
3371  if (settings_len > 0) {
3372  buf = av_packet_new_side_data(pkt,
3374  settings_len);
3375  if (!buf) {
3376  av_packet_unref(pkt);
3377  return AVERROR(ENOMEM);
3378  }
3379  memcpy(buf, settings, settings_len);
3380  }
3381 
3382  // Do we need this for subtitles?
3383  // pkt->flags = AV_PKT_FLAG_KEY;
3384 
3385  pkt->stream_index = st->index;
3386  pkt->pts = timecode;
3387 
3388  // Do we need this for subtitles?
3389  // pkt->dts = timecode;
3390 
3391  pkt->duration = duration;
3392  pkt->pos = pos;
3393 
3394  err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3395  if (err < 0) {
3396  av_packet_unref(pkt);
3397  return AVERROR(ENOMEM);
3398  }
3399 
3400  return 0;
3401 }
3402 
3404  MatroskaTrack *track, AVStream *st,
3405  AVBufferRef *buf, uint8_t *data, int pkt_size,
3406  uint64_t timecode, uint64_t lace_duration,
3407  int64_t pos, int is_keyframe,
3408  uint8_t *additional, uint64_t additional_id, int additional_size,
3409  int64_t discard_padding)
3410 {
3411  MatroskaTrackEncoding *encodings = track->encodings.elem;
3412  uint8_t *pkt_data = data;
3413  int res;
3414  AVPacket pktl, *pkt = &pktl;
3415 
3416  if (encodings && !encodings->type && encodings->scope & 1) {
3417  res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
3418  if (res < 0)
3419  return res;
3420  }
3421 
3422  if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3423  uint8_t *wv_data;
3424  res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
3425  if (res < 0) {
3426  av_log(matroska->ctx, AV_LOG_ERROR,
3427  "Error parsing a wavpack block.\n");
3428  goto fail;
3429  }
3430  if (pkt_data != data)
3431  av_freep(&pkt_data);
3432  pkt_data = wv_data;
3433  }
3434 
3435  if (st->codecpar->codec_id == AV_CODEC_ID_PRORES) {
3436  uint8_t *pr_data;
3437  res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
3438  if (res < 0) {
3439  av_log(matroska->ctx, AV_LOG_ERROR,
3440  "Error parsing a prores block.\n");
3441  goto fail;
3442  }
3443  if (pkt_data != data)
3444  av_freep(&pkt_data);
3445  pkt_data = pr_data;
3446  }
3447 
3448  av_init_packet(pkt);
3449  if (pkt_data != data)
3450  pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3451  NULL, NULL, 0);
3452  else
3453  pkt->buf = av_buffer_ref(buf);
3454 
3455  if (!pkt->buf) {
3456  res = AVERROR(ENOMEM);
3457  goto fail;
3458  }
3459 
3460  pkt->data = pkt_data;
3461  pkt->size = pkt_size;
3462  pkt->flags = is_keyframe;
3463  pkt->stream_index = st->index;
3464 
3465  if (additional_size > 0) {
3466  uint8_t *side_data = av_packet_new_side_data(pkt,
3468  additional_size + 8);
3469  if (!side_data) {
3470  av_packet_unref(pkt);
3471  return AVERROR(ENOMEM);
3472  }
3473  AV_WB64(side_data, additional_id);
3474  memcpy(side_data + 8, additional, additional_size);
3475  }
3476 
3477  if (discard_padding) {
3478  uint8_t *side_data = av_packet_new_side_data(pkt,
3480  10);
3481  if (!side_data) {
3482  av_packet_unref(pkt);
3483  return AVERROR(ENOMEM);
3484  }
3485  discard_padding = av_rescale_q(discard_padding,
3486  (AVRational){1, 1000000000},
3487  (AVRational){1, st->codecpar->sample_rate});
3488  if (discard_padding > 0) {
3489  AV_WL32(side_data + 4, discard_padding);
3490  } else {
3491  AV_WL32(side_data, -discard_padding);
3492  }
3493  }
3494 
3495  if (track->ms_compat)
3496  pkt->dts = timecode;
3497  else
3498  pkt->pts = timecode;
3499  pkt->pos = pos;
3500  pkt->duration = lace_duration;
3501 
3502 #if FF_API_CONVERGENCE_DURATION
3504  if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3505  pkt->convergence_duration = lace_duration;
3506  }
3508 #endif
3509 
3510  res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3511  if (res < 0) {
3512  av_packet_unref(pkt);
3513  return AVERROR(ENOMEM);
3514  }
3515 
3516  return 0;
3517 
3518 fail:
3519  if (pkt_data != data)
3520  av_freep(&pkt_data);
3521  return res;
3522 }
3523 
3525  int size, int64_t pos, uint64_t cluster_time,
3526  uint64_t block_duration, int is_keyframe,
3527  uint8_t *additional, uint64_t additional_id, int additional_size,
3528  int64_t cluster_pos, int64_t discard_padding)
3529 {
3530  uint64_t timecode = AV_NOPTS_VALUE;
3531  MatroskaTrack *track;
3532  int res = 0;
3533  AVStream *st;
3534  int16_t block_time;
3535  uint32_t *lace_size = NULL;
3536  int n, flags, laces = 0;
3537  uint64_t num;
3538  int trust_default_duration = 1;
3539 
3540  if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
3541  return n;
3542  }
3543  data += n;
3544  size -= n;
3545 
3546  track = matroska_find_track_by_num(matroska, num);
3547  if (!track || !track->stream) {
3548  av_log(matroska->ctx, AV_LOG_INFO,
3549  "Invalid stream %"PRIu64"\n", num);
3550  return AVERROR_INVALIDDATA;
3551  } else if (size <= 3)
3552  return 0;
3553  st = track->stream;
3554  if (st->discard >= AVDISCARD_ALL)
3555  return res;
3556  av_assert1(block_duration != AV_NOPTS_VALUE);
3557 
3558  block_time = sign_extend(AV_RB16(data), 16);
3559  data += 2;
3560  flags = *data++;
3561  size -= 3;
3562  if (is_keyframe == -1)
3563  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3564 
3565  if (cluster_time != (uint64_t) -1 &&
3566  (block_time >= 0 || cluster_time >= -block_time)) {
3567  timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3568  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3569  timecode < track->end_timecode)
3570  is_keyframe = 0; /* overlapping subtitles are not key frame */
3571  if (is_keyframe) {
3572  ff_reduce_index(matroska->ctx, st->index);
3573  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3575  }
3576  }
3577 
3578  if (matroska->skip_to_keyframe &&
3579  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3580  // Compare signed timecodes. Timecode may be negative due to codec delay
3581  // offset. We don't support timestamps greater than int64_t anyway - see
3582  // AVPacket's pts.
3583  if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3584  return res;
3585  if (is_keyframe)
3586  matroska->skip_to_keyframe = 0;
3587  else if (!st->skip_to_keyframe) {
3588  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3589  matroska->skip_to_keyframe = 0;
3590  }
3591  }
3592 
3593  res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
3594  &lace_size, &laces);
3595 
3596  if (res)
3597  goto end;
3598 
3599  if (track->audio.samplerate == 8000) {
3600  // If this is needed for more codecs, then add them here
3601  if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3602  if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3603  trust_default_duration = 0;
3604  }
3605  }
3606 
3607  if (!block_duration && trust_default_duration)
3608  block_duration = track->default_duration * laces / matroska->time_scale;
3609 
3610  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3611  track->end_timecode =
3612  FFMAX(track->end_timecode, timecode + block_duration);
3613 
3614  for (n = 0; n < laces; n++) {
3615  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3616 
3617  if (lace_size[n] > size) {
3618  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
3619  break;
3620  }
3621 
3622  if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
3626  st->codecpar->block_align && track->audio.sub_packet_size) {
3627  res = matroska_parse_rm_audio(matroska, track, st, data,
3628  lace_size[n],
3629  timecode, pos);
3630  if (res)
3631  goto end;
3632 
3633  } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3634  res = matroska_parse_webvtt(matroska, track, st,
3635  data, lace_size[n],
3636  timecode, lace_duration,
3637  pos);
3638  if (res)
3639  goto end;
3640  } else {
3641  res = matroska_parse_frame(matroska, track, st, buf, data, lace_size[n],
3642  timecode, lace_duration, pos,
3643  !n ? is_keyframe : 0,
3644  additional, additional_id, additional_size,
3645  discard_padding);
3646  if (res)
3647  goto end;
3648  }
3649 
3650  if (timecode != AV_NOPTS_VALUE)
3651  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3652  data += lace_size[n];
3653  size -= lace_size[n];
3654  }
3655 
3656 end:
3657  av_free(lace_size);
3658  return res;
3659 }
3660 
3662 {
3663  MatroskaCluster *cluster = &matroska->current_cluster;
3664  MatroskaBlock *block = &cluster->block;
3665  int res;
3666 
3667  av_assert0(matroska->num_levels <= 2);
3668 
3669  if (matroska->num_levels == 1) {
3670  res = ebml_parse(matroska, matroska_segment, NULL);
3671 
3672  if (res == 1) {
3673  /* Found a cluster: subtract the size of the ID already read. */
3674  cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3675 
3676  res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3677  if (res < 0)
3678  return res;
3679  }
3680  }
3681 
3682  if (matroska->num_levels == 2) {
3683  /* We are inside a cluster. */
3684  res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3685 
3686  if (res >= 0 && block->bin.size > 0) {
3687  int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3688  uint8_t* additional = block->additional.size > 0 ?
3689  block->additional.data : NULL;
3690 
3691  res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3692  block->bin.size, block->bin.pos,
3693  cluster->timecode, block->duration,
3694  is_keyframe, additional, block->additional_id,
3695  block->additional.size, cluster->pos,
3696  block->discard_padding);
3697  }
3698 
3699  ebml_free(matroska_blockgroup, block);
3700  memset(block, 0, sizeof(*block));
3701  } else if (!matroska->num_levels) {
3702  if (!avio_feof(matroska->ctx->pb)) {
3703  avio_r8(matroska->ctx->pb);
3704  if (!avio_feof(matroska->ctx->pb)) {
3705  av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3706  "end of segment.\n");
3707  return AVERROR_INVALIDDATA;
3708  }
3709  }
3710  matroska->done = 1;
3711  return AVERROR_EOF;
3712  }
3713 
3714  return res;
3715 }
3716 
3718 {
3719  MatroskaDemuxContext *matroska = s->priv_data;
3720  int ret = 0;
3721 
3722  if (matroska->resync_pos == -1) {
3723  // This can only happen if generic seeking has been used.
3724  matroska->resync_pos = avio_tell(s->pb);
3725  }
3726 
3727  while (matroska_deliver_packet(matroska, pkt)) {
3728  if (matroska->done)
3729  return (ret < 0) ? ret : AVERROR_EOF;
3730  if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3731  ret = matroska_resync(matroska, matroska->resync_pos);
3732  }
3733 
3734  return 0;
3735 }
3736 
3737 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3738  int64_t timestamp, int flags)
3739 {
3740  MatroskaDemuxContext *matroska = s->priv_data;
3741  MatroskaTrack *tracks = NULL;
3742  AVStream *st = s->streams[stream_index];
3743  int i, index;
3744 
3745  /* Parse the CUES now since we need the index data to seek. */
3746  if (matroska->cues_parsing_deferred > 0) {
3747  matroska->cues_parsing_deferred = 0;
3748  matroska_parse_cues(matroska);
3749  }
3750 
3751  if (!st->nb_index_entries)
3752  goto err;
3753  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3754 
3755  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3756  matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3757  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3758  matroska_clear_queue(matroska);
3759  if (matroska_parse_cluster(matroska) < 0)
3760  break;
3761  }
3762  }
3763 
3764  matroska_clear_queue(matroska);
3765  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3766  goto err;
3767 
3768  tracks = matroska->tracks.elem;
3769  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3770  tracks[i].audio.pkt_cnt = 0;
3771  tracks[i].audio.sub_packet_cnt = 0;
3772  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3773  tracks[i].end_timecode = 0;
3774  }
3775 
3776  /* We seek to a level 1 element, so set the appropriate status. */
3777  matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3778  if (flags & AVSEEK_FLAG_ANY) {
3779  st->skip_to_keyframe = 0;
3780  matroska->skip_to_timecode = timestamp;
3781  } else {
3782  st->skip_to_keyframe = 1;
3783  matroska->skip_to_timecode = st->index_entries[index].timestamp;
3784  }
3785  matroska->skip_to_keyframe = 1;
3786  matroska->done = 0;
3787  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3788  return 0;
3789 err:
3790  // slightly hackish but allows proper fallback to
3791  // the generic seeking code.
3792  matroska_reset_status(matroska, 0, -1);
3793  matroska->resync_pos = -1;
3794  matroska_clear_queue(matroska);
3795  st->skip_to_keyframe =
3796  matroska->skip_to_keyframe = 0;
3797  matroska->done = 0;
3798  return -1;
3799 }
3800 
3802 {
3803  MatroskaDemuxContext *matroska = s->priv_data;
3804  MatroskaTrack *tracks = matroska->tracks.elem;
3805  int n;
3806 
3807  matroska_clear_queue(matroska);
3808 
3809  for (n = 0; n < matroska->tracks.nb_elem; n++)
3810  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3811  av_freep(&tracks[n].audio.buf);
3812  ebml_free(matroska_segment, matroska);
3813 
3814  return 0;
3815 }
3816 
3817 typedef struct {
3818  int64_t start_time_ns;
3819  int64_t end_time_ns;
3820  int64_t start_offset;
3821  int64_t end_offset;
3822 } CueDesc;
3823 
3824 /* This function searches all the Cues and returns the CueDesc corresponding to
3825  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3826  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3827  */
3828 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3829  MatroskaDemuxContext *matroska = s->priv_data;
3830  CueDesc cue_desc;
3831  int i;
3832  int nb_index_entries = s->streams[0]->nb_index_entries;
3833  AVIndexEntry *index_entries = s->streams[0]->index_entries;
3834  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3835  for (i = 1; i < nb_index_entries; i++) {
3836  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3837  index_entries[i].timestamp * matroska->time_scale > ts) {
3838  break;
3839  }
3840  }
3841  --i;
3842  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3843  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3844  if (i != nb_index_entries - 1) {
3845  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3846  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3847  } else {
3848  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3849  // FIXME: this needs special handling for files where Cues appear
3850  // before Clusters. the current logic assumes Cues appear after
3851  // Clusters.
3852  cue_desc.end_offset = cues_start - matroska->segment_start;
3853  }
3854  return cue_desc;
3855 }
3856 
3858 {
3859  MatroskaDemuxContext *matroska = s->priv_data;
3860  uint32_t id = matroska->current_id;
3861  int64_t cluster_pos, before_pos;
3862  int index, rv = 1;
3863  if (s->streams[0]->nb_index_entries <= 0) return 0;
3864  // seek to the first cluster using cues.
3865  index = av_index_search_timestamp(s->streams[0], 0, 0);
3866  if (index < 0) return 0;
3867  cluster_pos = s->streams[0]->index_entries[index].pos;
3868  before_pos = avio_tell(s->pb);
3869  while (1) {
3870  uint64_t cluster_id, cluster_length;
3871  int read;
3872  AVPacket *pkt;
3873  avio_seek(s->pb, cluster_pos, SEEK_SET);
3874  // read cluster id and length
3875  read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3876  if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3877  break;
3878  read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3879  if (read < 0)
3880  break;
3881 
3882  matroska_reset_status(matroska, 0, cluster_pos);
3883  matroska_clear_queue(matroska);
3884  if (matroska_parse_cluster(matroska) < 0 ||
3885  !matroska->queue) {
3886  break;
3887  }
3888  pkt = &matroska->queue->pkt;
3889  // 4 + read is the length of the cluster id and the cluster length field.
3890  cluster_pos += 4 + read + cluster_length;
3891  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3892  rv = 0;
3893  break;
3894  }
3895  }
3896 
3897  /* Restore the status after matroska_read_header: */
3898  matroska_reset_status(matroska, id, before_pos);
3899 
3900  return rv;
3901 }
3902 
3903 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3904  double min_buffer, double* buffer,
3905  double* sec_to_download, AVFormatContext *s,
3906  int64_t cues_start)
3907 {
3908  double nano_seconds_per_second = 1000000000.0;
3909  double time_sec = time_ns / nano_seconds_per_second;
3910  int rv = 0;
3911  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3912  int64_t end_time_ns = time_ns + time_to_search_ns;
3913  double sec_downloaded = 0.0;
3914  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3915  if (desc_curr.start_time_ns == -1)
3916  return -1;
3917  *sec_to_download = 0.0;
3918 
3919  // Check for non cue start time.
3920  if (time_ns > desc_curr.start_time_ns) {
3921  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3922  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3923  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3924  double timeToDownload = (cueBytes * 8.0) / bps;
3925 
3926  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3927  *sec_to_download += timeToDownload;
3928 
3929  // Check if the search ends within the first cue.
3930  if (desc_curr.end_time_ns >= end_time_ns) {
3931  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3932  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3933  sec_downloaded = percent_to_sub * sec_downloaded;
3934  *sec_to_download = percent_to_sub * *sec_to_download;
3935  }
3936 
3937  if ((sec_downloaded + *buffer) <= min_buffer) {
3938  return 1;
3939  }
3940 
3941  // Get the next Cue.
3942  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3943  }
3944 
3945  while (desc_curr.start_time_ns != -1) {
3946  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3947  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3948  double desc_sec = desc_ns / nano_seconds_per_second;
3949  double bits = (desc_bytes * 8.0);
3950  double time_to_download = bits / bps;
3951 
3952  sec_downloaded += desc_sec - time_to_download;
3953  *sec_to_download += time_to_download;
3954 
3955  if (desc_curr.end_time_ns >= end_time_ns) {
3956  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3957  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3958  sec_downloaded = percent_to_sub * sec_downloaded;
3959  *sec_to_download = percent_to_sub * *sec_to_download;
3960 
3961  if ((sec_downloaded + *buffer) <= min_buffer)
3962  rv = 1;
3963  break;
3964  }
3965 
3966  if ((sec_downloaded + *buffer) <= min_buffer) {
3967  rv = 1;
3968  break;
3969  }
3970 
3971  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3972  }
3973  *buffer = *buffer + sec_downloaded;
3974  return rv;
3975 }
3976 
3977 /* This function computes the bandwidth of the WebM file with the help of
3978  * buffer_size_after_time_downloaded() function. Both of these functions are
3979  * adapted from WebM Tools project and are adapted to work with FFmpeg's
3980  * Matroska parsing mechanism.
3981  *
3982  * Returns the bandwidth of the file on success; -1 on error.
3983  * */
3984 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3985 {
3986  MatroskaDemuxContext *matroska = s->priv_data;
3987  AVStream *st = s->streams[0];
3988  double bandwidth = 0.0;
3989  int i;
3990 
3991  for (i = 0; i < st->nb_index_entries; i++) {
3992  int64_t prebuffer_ns = 1000000000;
3993  int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3994  double nano_seconds_per_second = 1000000000.0;
3995  int64_t prebuffered_ns = time_ns + prebuffer_ns;
3996  double prebuffer_bytes = 0.0;
3997  int64_t temp_prebuffer_ns = prebuffer_ns;
3998  int64_t pre_bytes, pre_ns;
3999  double pre_sec, prebuffer, bits_per_second;
4000  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4001 
4002  // Start with the first Cue.
4003  CueDesc desc_end = desc_beg;
4004 
4005  // Figure out how much data we have downloaded for the prebuffer. This will
4006  // be used later to adjust the bits per sample to try.
4007  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4008  // Prebuffered the entire Cue.
4009  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4010  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4011  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4012  }
4013  if (desc_end.start_time_ns == -1) {
4014  // The prebuffer is larger than the duration.
4015  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4016  return -1;
4017  bits_per_second = 0.0;
4018  } else {
4019  // The prebuffer ends in the last Cue. Estimate how much data was
4020  // prebuffered.
4021  pre_bytes = desc_end.end_offset - desc_end.start_offset;
4022  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4023  pre_sec = pre_ns / nano_seconds_per_second;
4024  prebuffer_bytes +=
4025  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4026 
4027  prebuffer = prebuffer_ns / nano_seconds_per_second;
4028 
4029  // Set this to 0.0 in case our prebuffer buffers the entire video.
4030  bits_per_second = 0.0;
4031  do {
4032  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4033  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4034  double desc_sec = desc_ns / nano_seconds_per_second;
4035  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4036 
4037  // Drop the bps by the percentage of bytes buffered.
4038  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4039  double mod_bits_per_second = calc_bits_per_second * percent;
4040 
4041  if (prebuffer < desc_sec) {
4042  double search_sec =
4043  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4044 
4045  // Add 1 so the bits per second should be a little bit greater than file
4046  // datarate.
4047  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4048  const double min_buffer = 0.0;
4049  double buffer = prebuffer;
4050  double sec_to_download = 0.0;
4051 
4052  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4053  min_buffer, &buffer, &sec_to_download,
4054  s, cues_start);
4055  if (rv < 0) {
4056  return -1;
4057  } else if (rv == 0) {
4058  bits_per_second = (double)(bps);
4059  break;
4060  }
4061  }
4062 
4063  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4064  } while (desc_end.start_time_ns != -1);
4065  }
4066  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4067  }
4068  return (int64_t)bandwidth;
4069 }
4070 
4071 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4072 {
4073  MatroskaDemuxContext *matroska = s->priv_data;
4074  EbmlList *seekhead_list = &matroska->seekhead;
4075  MatroskaSeekhead *seekhead = seekhead_list->elem;
4076  char *buf;
4077  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4078  int i;
4079  int end = 0;
4080 
4081  // determine cues start and end positions
4082  for (i = 0; i < seekhead_list->nb_elem; i++)
4083  if (seekhead[i].id == MATROSKA_ID_CUES)
4084  break;
4085 
4086  if (i >= seekhead_list->nb_elem) return -1;
4087 
4088  before_pos = avio_tell(matroska->ctx->pb);
4089  cues_start = seekhead[i].pos + matroska->segment_start;
4090  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4091  // cues_end is computed as cues_start + cues_length + length of the
4092  // Cues element ID (i.e. 4) + EBML length of the Cues element.
4093  // cues_end is inclusive and the above sum is reduced by 1.
4094  uint64_t cues_length, cues_id;
4095  int bytes_read;
4096  bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4097  if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4098  return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4099  bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4100  if (bytes_read < 0)
4101  return bytes_read;
4102  cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4103  }
4104  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4105  if (cues_start == -1 || cues_end == -1) return -1;
4106 
4107  // parse the cues
4108  matroska_parse_cues(matroska);
4109 
4110  // cues start
4111  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4112 
4113  // cues end
4114  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4115 
4116  // if the file has cues at the start, fix up the init range so that
4117  // it does not include it
4118  if (cues_start <= init_range)
4119  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4120 
4121  // bandwidth
4122  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4123  if (bandwidth < 0) return -1;
4124  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4125 
4126  // check if all clusters start with key frames
4128 
4129  // store cue point timestamps as a comma separated list for checking subsegment alignment in
4130  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4131  buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4132  if (!buf) return -1;
4133  strcpy(buf, "");
4134  for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4135  int ret = snprintf(buf + end, 20,
4136  "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4137  i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4138  if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4139  av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4140  av_free(buf);
4141  return AVERROR_INVALIDDATA;
4142  }
4143  end += ret;
4144  }
4145  av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
4146  av_free(buf);
4147 
4148  return 0;
4149 }
4150 
4152 {
4153  char *buf;
4154  int ret = matroska_read_header(s);
4155  int64_t init_range;
4156  MatroskaTrack *tracks;
4157  MatroskaDemuxContext *matroska = s->priv_data;
4158  if (ret) {
4159  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4160  return -1;
4161  }
4162  if (!s->nb_streams) {
4164  av_log(s, AV_LOG_ERROR, "No streams found\n");
4165  return AVERROR_INVALIDDATA;
4166  }
4167 
4168  if (!matroska->is_live) {
4169  buf = av_asprintf("%g", matroska->duration);
4170  if (!buf) return AVERROR(ENOMEM);
4171  av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
4172  av_free(buf);
4173 
4174  // initialization range
4175  // 5 is the offset of Cluster ID.
4176  init_range = avio_tell(s->pb) - 5;
4177  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4178  }
4179 
4180  // basename of the file
4181  buf = strrchr(s->url, '/');
4182  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4183 
4184  // track number
4185  tracks = matroska->tracks.elem;
4186  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4187 
4188  // parse the cues and populate Cue related fields
4189  if (!matroska->is_live) {
4190  ret = webm_dash_manifest_cues(s, init_range);
4191  if (ret < 0) {
4192  av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4193  return ret;
4194  }
4195  }
4196 
4197  // use the bandwidth from the command line if it was provided
4198  if (matroska->bandwidth > 0) {
4200  matroska->bandwidth, 0);
4201  }
4202  return 0;
4203 }
4204 
4206 {
4207  return AVERROR_EOF;
4208 }
4209 
4210 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4211 static const AVOption options[] = {
4212  { "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 },
4213  { "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 },
4214  { NULL },
4215 };
4216 
4217 static const AVClass webm_dash_class = {
4218  .class_name = "WebM DASH Manifest demuxer",
4219  .item_name = av_default_item_name,
4220  .option = options,
4221  .version = LIBAVUTIL_VERSION_INT,
4222 };
4223 
4225  .name = "matroska,webm",
4226  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4227  .extensions = "mkv,mk3d,mka,mks",
4228  .priv_data_size = sizeof(MatroskaDemuxContext),
4234  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4235 };
4236 
4238  .name = "webm_dash_manifest",
4239  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4240  .priv_data_size = sizeof(MatroskaDemuxContext),
4244  .priv_class = &webm_dash_class,
4245 };
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:4058
#define AV_DISPOSITION_METADATA
Definition: avformat.h:863
#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:4049
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:472
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:3103
Bytestream IO Context.
Definition: avio.h:161
enum AVColorTransferCharacteristic color_trc
Definition: avcodec.h:4056
#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:1746
#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:125
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1343
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:4205
#define MATROSKA_ID_TRACKENTRY
Definition: matroska.h:75
static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
Definition: matroskadec.c:2960
#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:4224
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:58
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail, AVPacket *pkt, int flags)
Append an AVPacket to the list.
Definition: utils.c:447
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:2049
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:3158
#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:1500
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska, uint8_t *data, uint32_t size, int64_t *num)
Definition: matroskadec.c:1041
static int webm_clusters_start_with_keyframe(AVFormatContext *s)
Definition: matroskadec.c:3857
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:4926
int64_t pos
Definition: avformat.h:810
#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:2513
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:82
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
enum AVCodecID codec_id
Definition: qsv.c:77
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:3968
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:943
#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:882
int size
Definition: avcodec.h:1481
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:1110
MatroskaTrackVideoProjection projection
Definition: matroskadec.c:200
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1811
#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:814
#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
#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:4057
#define MATROSKA_ID_TRACKCONTENTENCODINGS
Definition: matroska.h:105
int frame_size
Audio only.
Definition: avcodec.h:4089
Mastering display metadata (based on SMPTE-2086:2014).
Definition: avcodec.h:1369
#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:4627
#define EBML_VERSION
Definition: matroska.h:30
#define MATROSKA_ID_FILEDESC
Definition: matroska.h:243
Format I/O context.
Definition: avformat.h:1358
#define EBML_ID_CRC32
Definition: matroska.h:46
uint64_t def
Definition: matroskadec.c:290
UID uid
Definition: mxfenc.c:2213
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:1963
#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:4151
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:1977
#define AVFMT_FLAG_IGNIDX
Ignore index.
Definition: avformat.h:1491
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:1128
uint64_t pixel_height
Definition: matroskadec.c:192
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:372
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint64_t algo
Definition: matro