FFmpeg
matroskadec.c
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1 /*
2  * Matroska file demuxer
3  * Copyright (c) 2003-2008 The FFmpeg Project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Matroska file demuxer
25  * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
26  * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
27  * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28  * @see specs available on the Matroska project page: http://www.matroska.org/
29  */
30 
31 #include "config.h"
32 
33 #include <inttypes.h>
34 #include <stdio.h>
35 
36 #include "libavutil/avstring.h"
37 #include "libavutil/base64.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lzo.h"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/opt.h"
46 #include "libavutil/spherical.h"
47 
48 #include "libavcodec/bytestream.h"
49 #include "libavcodec/flac.h"
50 #include "libavcodec/mpeg4audio.h"
51 
52 #include "avformat.h"
53 #include "avio_internal.h"
54 #include "internal.h"
55 #include "isom.h"
56 #include "matroska.h"
57 #include "oggdec.h"
58 /* For ff_codec_get_id(). */
59 #include "riff.h"
60 #include "rmsipr.h"
61 
62 #if CONFIG_BZLIB
63 #include <bzlib.h>
64 #endif
65 #if CONFIG_ZLIB
66 #include <zlib.h>
67 #endif
68 
69 #include "qtpalette.h"
70 
71 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
72 #define NEEDS_CHECKING 2 /* Indicates that some error checks
73  * still need to be performed */
74 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
75  * syntax level used for parsing ended. */
76 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
77  * of unkown, potentially damaged data is encountered,
78  * it is considered an error. */
79 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
80  * to this many bytes of unknown data for the
81  * SKIP_THRESHOLD check. */
82 
83 typedef enum {
95 } EbmlType;
96 
97 typedef const struct EbmlSyntax {
98  uint32_t id;
101  size_t data_offset;
102  union {
103  int64_t i;
104  uint64_t u;
105  double f;
106  const char *s;
107  const struct EbmlSyntax *n;
108  } def;
109 } EbmlSyntax;
110 
111 typedef struct EbmlList {
112  int nb_elem;
113  unsigned int alloc_elem_size;
114  void *elem;
115 } EbmlList;
116 
117 typedef struct EbmlBin {
118  int size;
121  int64_t pos;
122 } EbmlBin;
123 
124 typedef struct Ebml {
125  uint64_t version;
126  uint64_t max_size;
127  uint64_t id_length;
128  char *doctype;
129  uint64_t doctype_version;
130 } Ebml;
131 
132 typedef struct MatroskaTrackCompression {
133  uint64_t algo;
136 
137 typedef struct MatroskaTrackEncryption {
138  uint64_t algo;
141 
142 typedef struct MatroskaTrackEncoding {
143  uint64_t scope;
144  uint64_t type;
148 
149 typedef struct MatroskaMasteringMeta {
150  double r_x;
151  double r_y;
152  double g_x;
153  double g_y;
154  double b_x;
155  double b_y;
156  double white_x;
157  double white_y;
161 
162 typedef struct MatroskaTrackVideoColor {
165  uint64_t chroma_sub_horz;
166  uint64_t chroma_sub_vert;
167  uint64_t cb_sub_horz;
168  uint64_t cb_sub_vert;
171  uint64_t range;
173  uint64_t primaries;
174  uint64_t max_cll;
175  uint64_t max_fall;
178 
180  uint64_t type;
181  EbmlBin private;
182  double yaw;
183  double pitch;
184  double roll;
186 
187 typedef struct MatroskaTrackVideo {
188  double frame_rate;
189  uint64_t display_width;
190  uint64_t display_height;
191  uint64_t pixel_width;
192  uint64_t pixel_height;
194  uint64_t display_unit;
195  uint64_t interlaced;
196  uint64_t field_order;
197  uint64_t stereo_mode;
198  uint64_t alpha_mode;
202 
203 typedef struct MatroskaTrackAudio {
204  double samplerate;
206  uint64_t bitdepth;
207  uint64_t channels;
208 
209  /* real audio header (extracted from extradata) */
215  int pkt_cnt;
216  uint64_t buf_timecode;
219 
220 typedef struct MatroskaTrackPlane {
221  uint64_t uid;
222  uint64_t type;
224 
225 typedef struct MatroskaTrackOperation {
228 
229 typedef struct MatroskaTrack {
230  uint64_t num;
231  uint64_t uid;
232  uint64_t type;
233  char *name;
234  char *codec_id;
236  char *language;
237  double time_scale;
239  uint64_t flag_default;
240  uint64_t flag_forced;
241  uint64_t seek_preroll;
246  uint64_t codec_delay;
248 
250  int64_t end_timecode;
253 
254  uint32_t palette[AVPALETTE_COUNT];
256 } MatroskaTrack;
257 
258 typedef struct MatroskaAttachment {
259  uint64_t uid;
260  char *filename;
261  char *mime;
263 
266 
267 typedef struct MatroskaChapter {
268  uint64_t start;
269  uint64_t end;
270  uint64_t uid;
271  char *title;
272 
275 
276 typedef struct MatroskaIndexPos {
277  uint64_t track;
278  uint64_t pos;
280 
281 typedef struct MatroskaIndex {
282  uint64_t time;
284 } MatroskaIndex;
285 
286 typedef struct MatroskaTag {
287  char *name;
288  char *string;
289  char *lang;
290  uint64_t def;
292 } MatroskaTag;
293 
294 typedef struct MatroskaTagTarget {
295  char *type;
296  uint64_t typevalue;
297  uint64_t trackuid;
298  uint64_t chapteruid;
299  uint64_t attachuid;
301 
302 typedef struct MatroskaTags {
305 } MatroskaTags;
306 
307 typedef struct MatroskaSeekhead {
308  uint64_t id;
309  uint64_t pos;
311 
312 typedef struct MatroskaLevel {
313  uint64_t start;
314  uint64_t length;
315 } MatroskaLevel;
316 
317 typedef struct MatroskaBlock {
318  uint64_t duration;
319  int64_t reference;
320  uint64_t non_simple;
322  uint64_t additional_id;
325 } MatroskaBlock;
326 
327 typedef struct MatroskaCluster {
329  uint64_t timecode;
330  int64_t pos;
332 
333 typedef struct MatroskaLevel1Element {
334  int64_t pos;
335  uint32_t id;
336  int parsed;
338 
339 typedef struct MatroskaDemuxContext {
340  const AVClass *class;
342 
343  /* EBML stuff */
346  uint32_t current_id;
347  int64_t resync_pos;
349 
350  uint64_t time_scale;
351  double duration;
352  char *title;
353  char *muxingapp;
361 
362  /* byte position of the segment inside the stream */
363  int64_t segment_start;
364 
365  /* the packet queue */
368 
369  int done;
370 
371  /* What to skip before effectively reading a packet. */
374 
375  /* File has a CUES element, but we defer parsing until it is needed. */
377 
378  /* Level1 elements and whether they were read yet */
379  MatroskaLevel1Element level1_elems[64];
381 
383 
384  /* WebM DASH Manifest live flag */
385  int is_live;
386 
387  /* Bandwidth value for WebM DASH Manifest */
390 
391 #define CHILD_OF(parent) { .def = { .n = parent } }
392 
393 // The following forward declarations need their size because
394 // a tentative definition with internal linkage must not be an
395 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
396 // Removing the sizes breaks MSVC.
403 
405  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
406  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
407  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
408  { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
409  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
411  { EBML_ID_DOCTYPEVERSION, EBML_NONE },
412  CHILD_OF(ebml_syntax)
413 };
414 
415 static EbmlSyntax ebml_syntax[] = {
416  { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
418  { 0 }
419 };
420 
422  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
424  { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
426  { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
427  { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
428  { MATROSKA_ID_SEGMENTUID, EBML_NONE },
429  CHILD_OF(matroska_segment)
430 };
431 
433  { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
434  { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
435  { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
436  { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
437  { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
438  { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
439  { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
440  { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
441  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
442  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
443  CHILD_OF(matroska_track_video_color)
444 };
445 
446 static EbmlSyntax matroska_track_video_color[] = {
447  { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
448  { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
449  { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
450  { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
451  { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
452  { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
458  { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
459  { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
460  { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
461  CHILD_OF(matroska_track_video)
462 };
463 
470  CHILD_OF(matroska_track_video)
471 };
472 
473 static EbmlSyntax matroska_track_video[] = {
474  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
475  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
476  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
477  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
478  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
479  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
480  { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
481  { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
482  { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
484  { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
485  { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
486  { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
491  { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
492  CHILD_OF(matroska_track)
493 };
494 
496  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
497  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
498  { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
499  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
500  CHILD_OF(matroska_track)
501 };
502 
506  CHILD_OF(matroska_track_encoding)
507 };
508 
513  { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
514  { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
515  { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
516  { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
517  CHILD_OF(matroska_track_encoding)
518 };
519 static EbmlSyntax matroska_track_encoding[] = {
520  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
521  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
522  { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
523  { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
525  CHILD_OF(matroska_track_encodings)
526 };
527 
528 static EbmlSyntax matroska_track_encodings[] = {
529  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
530  CHILD_OF(matroska_track)
531 };
532 
536  CHILD_OF(matroska_track_combine_planes)
537 };
538 
539 static EbmlSyntax matroska_track_combine_planes[] = {
540  { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
541  CHILD_OF(matroska_track_operation)
542 };
543 
544 static EbmlSyntax matroska_track_operation[] = {
545  { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
546  CHILD_OF(matroska_track)
547 };
548 
549 static EbmlSyntax matroska_track[] = {
550  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
552  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
555  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
556  { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
557  { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
558  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
559  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
560  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
561  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
562  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
563  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
564  { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
565  { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
566  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
567  { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
569  { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
570  { MATROSKA_ID_CODECNAME, EBML_NONE },
571  { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
572  { MATROSKA_ID_CODECINFOURL, EBML_NONE },
573  { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
574  { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
575  { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
576  CHILD_OF(matroska_tracks)
577 };
578 
579 static EbmlSyntax matroska_tracks[] = {
580  { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
581  CHILD_OF(matroska_segment)
582 };
583 
586  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
587  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
588  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
590  CHILD_OF(matroska_attachments)
591 };
592 
593 static EbmlSyntax matroska_attachments[] = {
594  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
595  CHILD_OF(matroska_segment)
596 };
597 
599  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
601  { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
602  CHILD_OF(matroska_chapter_entry)
603 };
604 
605 static EbmlSyntax matroska_chapter_entry[] = {
609  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
611  { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
612  { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
613  { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
614  CHILD_OF(matroska_chapter)
615 };
616 
617 static EbmlSyntax matroska_chapter[] = {
618  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
620  { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
621  { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
622  { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
623  CHILD_OF(matroska_chapters)
624 };
625 
626 static EbmlSyntax matroska_chapters[] = {
627  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
628  CHILD_OF(matroska_segment)
629 };
630 
632  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
635  { MATROSKA_ID_CUEDURATION, EBML_NONE },
636  { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
637  CHILD_OF(matroska_index_entry)
638 };
639 
640 static EbmlSyntax matroska_index_entry[] = {
641  { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
642  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
643  CHILD_OF(matroska_index)
644 };
645 
646 static EbmlSyntax matroska_index[] = {
647  { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
648  CHILD_OF(matroska_segment)
649 };
650 
652  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
653  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
654  { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
655  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
657  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
658  CHILD_OF(matroska_tag)
659 };
660 
663  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
664  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
665  { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
666  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
667  CHILD_OF(matroska_tag)
668 };
669 
670 static EbmlSyntax matroska_tag[] = {
671  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
672  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
673  CHILD_OF(matroska_tags)
674 };
675 
676 static EbmlSyntax matroska_tags[] = {
677  { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
678  CHILD_OF(matroska_segment)
679 };
680 
682  { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
683  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
684  CHILD_OF(matroska_seekhead)
685 };
686 
687 static EbmlSyntax matroska_seekhead[] = {
688  { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
689  CHILD_OF(matroska_segment)
690 };
691 
692 static EbmlSyntax matroska_segment[] = {
694  { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
695  { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
696  { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
697  { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
698  { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
699  { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
700  { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
701  { 0 } /* We don't want to go back to level 0, so don't add the parent. */
702 };
703 
705  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
706  { 0 }
707 };
708 
710  { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
711  { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
712  CHILD_OF(matroska_blockadditions)
713 };
714 
715 static EbmlSyntax matroska_blockadditions[] = {
716  { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
717  CHILD_OF(matroska_blockgroup)
718 };
719 
720 static EbmlSyntax matroska_blockgroup[] = {
721  { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
722  { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
724  { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
725  { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
727  { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
728  CHILD_OF(matroska_cluster_parsing)
729 };
730 
731 // The following array contains SimpleBlock and BlockGroup twice
732 // in order to reuse the other values for matroska_cluster_enter.
733 static EbmlSyntax matroska_cluster_parsing[] = {
734  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
735  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
736  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
738  { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
740  { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
741  CHILD_OF(matroska_segment)
742 };
743 
745  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
746  { 0 }
747 };
748 #undef CHILD_OF
749 
750 static const char *const matroska_doctypes[] = { "matroska", "webm" };
751 
753 
754 /*
755  * This function prepares the status for parsing of level 1 elements.
756  */
758  uint32_t id, int64_t position)
759 {
760  if (position >= 0) {
761  int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
762  if (err < 0)
763  return err;
764  }
765 
766  matroska->current_id = id;
767  matroska->num_levels = 1;
768  matroska->unknown_count = 0;
769  matroska->resync_pos = avio_tell(matroska->ctx->pb);
770  if (id)
771  matroska->resync_pos -= (av_log2(id) + 7) / 8;
772 
773  return 0;
774 }
775 
776 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
777 {
778  AVIOContext *pb = matroska->ctx->pb;
779  uint32_t id;
780 
781  /* Try to seek to the last position to resync from. If this doesn't work,
782  * we resync from the earliest position available: The start of the buffer. */
783  if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
784  av_log(matroska->ctx, AV_LOG_WARNING,
785  "Seek to desired resync point failed. Seeking to "
786  "earliest point available instead.\n");
787  avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
788  last_pos + 1), SEEK_SET);
789  }
790 
791  id = avio_rb32(pb);
792 
793  // try to find a toplevel element
794  while (!avio_feof(pb)) {
795  if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
796  id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
798  id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
799  /* Prepare the context for parsing of a level 1 element. */
800  matroska_reset_status(matroska, id, -1);
801  /* Given that we are here means that an error has occurred,
802  * so treat the segment as unknown length in order not to
803  * discard valid data that happens to be beyond the designated
804  * end of the segment. */
805  matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
806  return 0;
807  }
808  id = (id << 8) | avio_r8(pb);
809  }
810 
811  matroska->done = 1;
812  return pb->error ? pb->error : AVERROR_EOF;
813 }
814 
815 /*
816  * Read: an "EBML number", which is defined as a variable-length
817  * array of bytes. The first byte indicates the length by giving a
818  * number of 0-bits followed by a one. The position of the first
819  * "one" bit inside the first byte indicates the length of this
820  * number.
821  * Returns: number of bytes read, < 0 on error
822  */
824  int max_size, uint64_t *number, int eof_forbidden)
825 {
826  int read, n = 1;
827  uint64_t total;
828  int64_t pos;
829 
830  /* The first byte tells us the length in bytes - except when it is zero. */
831  total = avio_r8(pb);
832  if (pb->eof_reached)
833  goto err;
834 
835  /* get the length of the EBML number */
836  read = 8 - ff_log2_tab[total];
837 
838  if (!total || read > max_size) {
839  pos = avio_tell(pb) - 1;
840  if (!total) {
841  av_log(matroska->ctx, AV_LOG_ERROR,
842  "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
843  "of an EBML number\n", pos, pos);
844  } else {
845  av_log(matroska->ctx, AV_LOG_ERROR,
846  "Length %d indicated by an EBML number's first byte 0x%02x "
847  "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
848  read, (uint8_t) total, pos, pos, max_size);
849  }
850  return AVERROR_INVALIDDATA;
851  }
852 
853  /* read out length */
854  total ^= 1 << ff_log2_tab[total];
855  while (n++ < read)
856  total = (total << 8) | avio_r8(pb);
857 
858  if (pb->eof_reached) {
859  eof_forbidden = 1;
860  goto err;
861  }
862 
863  *number = total;
864 
865  return read;
866 
867 err:
868  pos = avio_tell(pb);
869  if (pb->error) {
870  av_log(matroska->ctx, AV_LOG_ERROR,
871  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
872  pos, pos);
873  return pb->error;
874  }
875  if (eof_forbidden) {
876  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
877  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
878  return AVERROR(EIO);
879  }
880  return AVERROR_EOF;
881 }
882 
883 /**
884  * Read a EBML length value.
885  * This needs special handling for the "unknown length" case which has multiple
886  * encodings.
887  */
889  uint64_t *number)
890 {
891  int res = ebml_read_num(matroska, pb, 8, number, 1);
892  if (res > 0 && *number + 1 == 1ULL << (7 * res))
893  *number = EBML_UNKNOWN_LENGTH;
894  return res;
895 }
896 
897 /*
898  * Read the next element as an unsigned int.
899  * Returns NEEDS_CHECKING.
900  */
901 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
902 {
903  int n = 0;
904 
905  /* big-endian ordering; build up number */
906  *num = 0;
907  while (n++ < size)
908  *num = (*num << 8) | avio_r8(pb);
909 
910  return NEEDS_CHECKING;
911 }
912 
913 /*
914  * Read the next element as a signed int.
915  * Returns NEEDS_CHECKING.
916  */
917 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
918 {
919  int n = 1;
920 
921  if (size == 0) {
922  *num = 0;
923  } else {
924  *num = sign_extend(avio_r8(pb), 8);
925 
926  /* big-endian ordering; build up number */
927  while (n++ < size)
928  *num = ((uint64_t)*num << 8) | avio_r8(pb);
929  }
930 
931  return NEEDS_CHECKING;
932 }
933 
934 /*
935  * Read the next element as a float.
936  * Returns NEEDS_CHECKING or < 0 on obvious failure.
937  */
938 static int ebml_read_float(AVIOContext *pb, int size, double *num)
939 {
940  if (size == 0)
941  *num = 0;
942  else if (size == 4)
943  *num = av_int2float(avio_rb32(pb));
944  else if (size == 8)
945  *num = av_int2double(avio_rb64(pb));
946  else
947  return AVERROR_INVALIDDATA;
948 
949  return NEEDS_CHECKING;
950 }
951 
952 /*
953  * Read the next element as an ASCII string.
954  * 0 is success, < 0 or NEEDS_CHECKING is failure.
955  */
956 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
957 {
958  char *res;
959  int ret;
960 
961  /* EBML strings are usually not 0-terminated, so we allocate one
962  * byte more, read the string and NULL-terminate it ourselves. */
963  if (!(res = av_malloc(size + 1)))
964  return AVERROR(ENOMEM);
965  if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
966  av_free(res);
967  return ret < 0 ? ret : NEEDS_CHECKING;
968  }
969  (res)[size] = '\0';
970  av_free(*str);
971  *str = res;
972 
973  return 0;
974 }
975 
976 /*
977  * Read the next element as binary data.
978  * 0 is success, < 0 or NEEDS_CHECKING is failure.
979  */
980 static int ebml_read_binary(AVIOContext *pb, int length,
981  int64_t pos, EbmlBin *bin)
982 {
983  int ret;
984 
985  ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
986  if (ret < 0)
987  return ret;
988  memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
989 
990  bin->data = bin->buf->data;
991  bin->size = length;
992  bin->pos = pos;
993  if ((ret = avio_read(pb, bin->data, length)) != length) {
994  av_buffer_unref(&bin->buf);
995  bin->data = NULL;
996  bin->size = 0;
997  return ret < 0 ? ret : NEEDS_CHECKING;
998  }
999 
1000  return 0;
1001 }
1002 
1003 /*
1004  * Read the next element, but only the header. The contents
1005  * are supposed to be sub-elements which can be read separately.
1006  * 0 is success, < 0 is failure.
1007  */
1009  uint64_t length, int64_t pos)
1010 {
1012 
1013  if (matroska->num_levels >= EBML_MAX_DEPTH) {
1014  av_log(matroska->ctx, AV_LOG_ERROR,
1015  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1016  return AVERROR(ENOSYS);
1017  }
1018 
1019  level = &matroska->levels[matroska->num_levels++];
1020  level->start = pos;
1021  level->length = length;
1022 
1023  return 0;
1024 }
1025 
1026 /*
1027  * Read a signed "EBML number"
1028  * Return: number of bytes processed, < 0 on error
1029  */
1031  AVIOContext *pb, int64_t *num)
1032 {
1033  uint64_t unum;
1034  int res;
1035 
1036  /* read as unsigned number first */
1037  if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1038  return res;
1039 
1040  /* make signed (weird way) */
1041  *num = unum - ((1LL << (7 * res - 1)) - 1);
1042 
1043  return res;
1044 }
1045 
1046 static int ebml_parse(MatroskaDemuxContext *matroska,
1047  EbmlSyntax *syntax, void *data);
1048 
1049 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1050 {
1051  int i;
1052 
1053  // Whoever touches this should be aware of the duplication
1054  // existing in matroska_cluster_parsing.
1055  for (i = 0; syntax[i].id; i++)
1056  if (id == syntax[i].id)
1057  break;
1058 
1059  return &syntax[i];
1060 }
1061 
1062 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1063  void *data)
1064 {
1065  int res;
1066 
1067  if (data) {
1068  for (int i = 0; syntax[i].id; i++)
1069  switch (syntax[i].type) {
1070  case EBML_UINT:
1071  *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1072  break;
1073  case EBML_SINT:
1074  *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1075  break;
1076  case EBML_FLOAT:
1077  *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1078  break;
1079  case EBML_STR:
1080  case EBML_UTF8:
1081  // the default may be NULL
1082  if (syntax[i].def.s) {
1083  uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1084  *dst = av_strdup(syntax[i].def.s);
1085  if (!*dst)
1086  return AVERROR(ENOMEM);
1087  }
1088  break;
1089  }
1090 
1091  if (!matroska->levels[matroska->num_levels - 1].length) {
1092  matroska->num_levels--;
1093  return 0;
1094  }
1095  }
1096 
1097  do {
1098  res = ebml_parse(matroska, syntax, data);
1099  } while (!res);
1100 
1101  return res == LEVEL_ENDED ? 0 : res;
1102 }
1103 
1104 static int is_ebml_id_valid(uint32_t id)
1105 {
1106  // Due to endian nonsense in Matroska, the highest byte with any bits set
1107  // will contain the leading length bit. This bit in turn identifies the
1108  // total byte length of the element by its position within the byte.
1109  unsigned int bits = av_log2(id);
1110  return id && (bits + 7) / 8 == (8 - bits % 8);
1111 }
1112 
1113 /*
1114  * Allocate and return the entry for the level1 element with the given ID. If
1115  * an entry already exists, return the existing entry.
1116  */
1118  uint32_t id)
1119 {
1120  int i;
1121  MatroskaLevel1Element *elem;
1122 
1123  if (!is_ebml_id_valid(id))
1124  return NULL;
1125 
1126  // Some files link to all clusters; useless.
1127  if (id == MATROSKA_ID_CLUSTER)
1128  return NULL;
1129 
1130  // There can be multiple seekheads.
1131  if (id != MATROSKA_ID_SEEKHEAD) {
1132  for (i = 0; i < matroska->num_level1_elems; i++) {
1133  if (matroska->level1_elems[i].id == id)
1134  return &matroska->level1_elems[i];
1135  }
1136  }
1137 
1138  // Only a completely broken file would have more elements.
1139  // It also provides a low-effort way to escape from circular seekheads
1140  // (every iteration will add a level1 entry).
1141  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1142  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1143  return NULL;
1144  }
1145 
1146  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1147  *elem = (MatroskaLevel1Element){.id = id};
1148 
1149  return elem;
1150 }
1151 
1152 static int ebml_parse(MatroskaDemuxContext *matroska,
1153  EbmlSyntax *syntax, void *data)
1154 {
1155  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1156  // Forbid unknown-length EBML_NONE elements.
1158  [EBML_UINT] = 8,
1159  [EBML_SINT] = 8,
1160  [EBML_FLOAT] = 8,
1161  // max. 16 MB for strings
1162  [EBML_STR] = 0x1000000,
1163  [EBML_UTF8] = 0x1000000,
1164  // max. 256 MB for binary data
1165  [EBML_BIN] = 0x10000000,
1166  // no limits for anything else
1167  };
1168  AVIOContext *pb = matroska->ctx->pb;
1169  uint32_t id;
1170  uint64_t length;
1171  int64_t pos = avio_tell(pb), pos_alt;
1172  int res, update_pos = 1, level_check;
1173  MatroskaLevel1Element *level1_elem;
1174  MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1175 
1176  if (!matroska->current_id) {
1177  uint64_t id;
1178  res = ebml_read_num(matroska, pb, 4, &id, 0);
1179  if (res < 0) {
1180  if (pb->eof_reached && res == AVERROR_EOF) {
1181  if (matroska->is_live)
1182  // in live mode, finish parsing if EOF is reached.
1183  return 1;
1184  if (level && pos == avio_tell(pb)) {
1185  if (level->length == EBML_UNKNOWN_LENGTH) {
1186  // Unknown-length levels automatically end at EOF.
1187  matroska->num_levels--;
1188  return LEVEL_ENDED;
1189  } else {
1190  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1191  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1192  }
1193  }
1194  }
1195  return res;
1196  }
1197  matroska->current_id = id | 1 << 7 * res;
1198  pos_alt = pos + res;
1199  } else {
1200  pos_alt = pos;
1201  pos -= (av_log2(matroska->current_id) + 7) / 8;
1202  }
1203 
1204  id = matroska->current_id;
1205 
1206  syntax = ebml_parse_id(syntax, id);
1207  if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1208  if (level && level->length == EBML_UNKNOWN_LENGTH) {
1209  // Unknown-length levels end when an element from an upper level
1210  // in the hierarchy is encountered.
1211  while (syntax->def.n) {
1212  syntax = ebml_parse_id(syntax->def.n, id);
1213  if (syntax->id) {
1214  matroska->num_levels--;
1215  return LEVEL_ENDED;
1216  }
1217  };
1218  }
1219 
1220  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1221  "%"PRId64"\n", id, pos);
1222  update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1223  }
1224 
1225  if (data) {
1226  data = (char *) data + syntax->data_offset;
1227  if (syntax->list_elem_size) {
1228  EbmlList *list = data;
1229  void *newelem;
1230 
1231  if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1232  return AVERROR(ENOMEM);
1233  newelem = av_fast_realloc(list->elem,
1234  &list->alloc_elem_size,
1235  (list->nb_elem + 1) * syntax->list_elem_size);
1236  if (!newelem)
1237  return AVERROR(ENOMEM);
1238  list->elem = newelem;
1239  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1240  memset(data, 0, syntax->list_elem_size);
1241  list->nb_elem++;
1242  }
1243  }
1244 
1245  if (syntax->type != EBML_STOP) {
1246  matroska->current_id = 0;
1247  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1248  return res;
1249 
1250  pos_alt += res;
1251 
1252  if (matroska->num_levels > 0) {
1253  if (length != EBML_UNKNOWN_LENGTH &&
1254  level->length != EBML_UNKNOWN_LENGTH) {
1255  uint64_t elem_end = pos_alt + length,
1256  level_end = level->start + level->length;
1257 
1258  if (elem_end < level_end) {
1259  level_check = 0;
1260  } else if (elem_end == level_end) {
1261  level_check = LEVEL_ENDED;
1262  } else {
1263  av_log(matroska->ctx, AV_LOG_ERROR,
1264  "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1265  "containing master element ending at 0x%"PRIx64"\n",
1266  pos, elem_end, level_end);
1267  return AVERROR_INVALIDDATA;
1268  }
1269  } else if (length != EBML_UNKNOWN_LENGTH) {
1270  level_check = 0;
1271  } else if (level->length != EBML_UNKNOWN_LENGTH) {
1272  av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1273  "at 0x%"PRIx64" inside parent with finite size\n", pos);
1274  return AVERROR_INVALIDDATA;
1275  } else {
1276  level_check = 0;
1277  if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1278  || syntax->type == EBML_NEST)) {
1279  // According to the current specifications only clusters and
1280  // segments are allowed to be unknown-length. We also accept
1281  // other unknown-length master elements.
1282  av_log(matroska->ctx, AV_LOG_WARNING,
1283  "Found unknown-length element 0x%"PRIX32" other than "
1284  "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1285  "parsing will nevertheless be attempted.\n", id, pos);
1286  update_pos = -1;
1287  }
1288  }
1289  } else
1290  level_check = 0;
1291 
1292  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1293  if (length != EBML_UNKNOWN_LENGTH) {
1294  av_log(matroska->ctx, AV_LOG_ERROR,
1295  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1296  "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1297  length, max_lengths[syntax->type], id, pos);
1298  } else if (syntax->type != EBML_NONE) {
1299  av_log(matroska->ctx, AV_LOG_ERROR,
1300  "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1301  "unknown length, yet the length of an element of its "
1302  "type must be known.\n", id, pos);
1303  } else {
1304  av_log(matroska->ctx, AV_LOG_ERROR,
1305  "Found unknown-length element with ID 0x%"PRIX32" at "
1306  "pos. 0x%"PRIx64" for which no syntax for parsing is "
1307  "available.\n", id, pos);
1308  }
1309  return AVERROR_INVALIDDATA;
1310  }
1311 
1312  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1313  // Loosing sync will likely manifest itself as encountering unknown
1314  // elements which are not reliably distinguishable from elements
1315  // belonging to future extensions of the format.
1316  // We use a heuristic to detect such situations: If the current
1317  // element is not expected at the current syntax level and there
1318  // were only a few unknown elements in a row, then the element is
1319  // skipped or considered defective based upon the length of the
1320  // current element (i.e. how much would be skipped); if there were
1321  // more than a few skipped elements in a row and skipping the current
1322  // element would lead us more than SKIP_THRESHOLD away from the last
1323  // known good position, then it is inferred that an error occurred.
1324  // The dependency on the number of unknown elements in a row exists
1325  // because the distance to the last known good position is
1326  // automatically big if the last parsed element was big.
1327  // In both cases, each unknown element is considered equivalent to
1328  // UNKNOWN_EQUIV of skipped bytes for the check.
1329  // The whole check is only done for non-seekable output, because
1330  // in this situation skipped data can't simply be rechecked later.
1331  // This is especially important when using unkown length elements
1332  // as the check for whether a child exceeds its containing master
1333  // element is not effective in this situation.
1334  if (update_pos) {
1335  matroska->unknown_count = 0;
1336  } else {
1337  int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1338 
1339  if (matroska->unknown_count > 3)
1340  dist += pos_alt - matroska->resync_pos;
1341 
1342  if (dist > SKIP_THRESHOLD) {
1343  av_log(matroska->ctx, AV_LOG_ERROR,
1344  "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1345  "length 0x%"PRIx64" considered as invalid data. Last "
1346  "known good position 0x%"PRIx64", %d unknown elements"
1347  " in a row\n", id, pos, length, matroska->resync_pos,
1348  matroska->unknown_count);
1349  return AVERROR_INVALIDDATA;
1350  }
1351  }
1352  }
1353 
1354  if (update_pos > 0) {
1355  // We have found an element that is allowed at this place
1356  // in the hierarchy and it passed all checks, so treat the beginning
1357  // of the element as the "last known good" position.
1358  matroska->resync_pos = pos;
1359  }
1360 
1361  if (!data && length != EBML_UNKNOWN_LENGTH)
1362  goto skip;
1363  }
1364 
1365  switch (syntax->type) {
1366  case EBML_UINT:
1367  res = ebml_read_uint(pb, length, data);
1368  break;
1369  case EBML_SINT:
1370  res = ebml_read_sint(pb, length, data);
1371  break;
1372  case EBML_FLOAT:
1373  res = ebml_read_float(pb, length, data);
1374  break;
1375  case EBML_STR:
1376  case EBML_UTF8:
1377  res = ebml_read_ascii(pb, length, data);
1378  break;
1379  case EBML_BIN:
1380  res = ebml_read_binary(pb, length, pos_alt, data);
1381  break;
1382  case EBML_LEVEL1:
1383  case EBML_NEST:
1384  if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1385  return res;
1386  if (id == MATROSKA_ID_SEGMENT)
1387  matroska->segment_start = pos_alt;
1388  if (id == MATROSKA_ID_CUES)
1389  matroska->cues_parsing_deferred = 0;
1390  if (syntax->type == EBML_LEVEL1 &&
1391  (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1392  if (!level1_elem->pos) {
1393  // Zero is not a valid position for a level 1 element.
1394  level1_elem->pos = pos;
1395  } else if (level1_elem->pos != pos)
1396  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1397  level1_elem->parsed = 1;
1398  }
1399  if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1400  return res;
1401  break;
1402  case EBML_STOP:
1403  return 1;
1404  skip:
1405  default:
1406  if (length) {
1407  int64_t res2;
1408  if (ffio_limit(pb, length) != length) {
1409  // ffio_limit emits its own error message,
1410  // so we don't have to.
1411  return AVERROR(EIO);
1412  }
1413  if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1414  // avio_skip might take us past EOF. We check for this
1415  // by skipping only length - 1 bytes, reading a byte and
1416  // checking the error flags. This is done in order to check
1417  // that the element has been properly skipped even when
1418  // no filesize (that ffio_limit relies on) is available.
1419  avio_r8(pb);
1420  res = NEEDS_CHECKING;
1421  } else
1422  res = res2;
1423  } else
1424  res = 0;
1425  }
1426  if (res) {
1427  if (res == NEEDS_CHECKING) {
1428  if (pb->eof_reached) {
1429  if (pb->error)
1430  res = pb->error;
1431  else
1432  res = AVERROR_EOF;
1433  } else
1434  goto level_check;
1435  }
1436 
1437  if (res == AVERROR_INVALIDDATA)
1438  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1439  else if (res == AVERROR(EIO))
1440  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1441  else if (res == AVERROR_EOF) {
1442  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1443  res = AVERROR(EIO);
1444  }
1445 
1446  return res;
1447  }
1448 
1449 level_check:
1450  if (level_check == LEVEL_ENDED && matroska->num_levels) {
1451  level = &matroska->levels[matroska->num_levels - 1];
1452  pos = avio_tell(pb);
1453 
1454  // Given that pos >= level->start no check for
1455  // level->length != EBML_UNKNOWN_LENGTH is necessary.
1456  while (matroska->num_levels && pos == level->start + level->length) {
1457  matroska->num_levels--;
1458  level--;
1459  }
1460  }
1461 
1462  return level_check;
1463 }
1464 
1465 static void ebml_free(EbmlSyntax *syntax, void *data)
1466 {
1467  int i, j;
1468  for (i = 0; syntax[i].id; i++) {
1469  void *data_off = (char *) data + syntax[i].data_offset;
1470  switch (syntax[i].type) {
1471  case EBML_STR:
1472  case EBML_UTF8:
1473  av_freep(data_off);
1474  break;
1475  case EBML_BIN:
1476  av_buffer_unref(&((EbmlBin *) data_off)->buf);
1477  break;
1478  case EBML_LEVEL1:
1479  case EBML_NEST:
1480  if (syntax[i].list_elem_size) {
1481  EbmlList *list = data_off;
1482  char *ptr = list->elem;
1483  for (j = 0; j < list->nb_elem;
1484  j++, ptr += syntax[i].list_elem_size)
1485  ebml_free(syntax[i].def.n, ptr);
1486  av_freep(&list->elem);
1487  list->nb_elem = 0;
1488  list->alloc_elem_size = 0;
1489  } else
1490  ebml_free(syntax[i].def.n, data_off);
1491  default:
1492  break;
1493  }
1494  }
1495 }
1496 
1497 /*
1498  * Autodetecting...
1499  */
1500 static int matroska_probe(const AVProbeData *p)
1501 {
1502  uint64_t total = 0;
1503  int len_mask = 0x80, size = 1, n = 1, i;
1504 
1505  /* EBML header? */
1506  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1507  return 0;
1508 
1509  /* length of header */
1510  total = p->buf[4];
1511  while (size <= 8 && !(total & len_mask)) {
1512  size++;
1513  len_mask >>= 1;
1514  }
1515  if (size > 8)
1516  return 0;
1517  total &= (len_mask - 1);
1518  while (n < size)
1519  total = (total << 8) | p->buf[4 + n++];
1520 
1521  if (total + 1 == 1ULL << (7 * size)){
1522  /* Unknown-length header - simply parse the whole buffer. */
1523  total = p->buf_size - 4 - size;
1524  } else {
1525  /* Does the probe data contain the whole header? */
1526  if (p->buf_size < 4 + size + total)
1527  return 0;
1528  }
1529 
1530  /* The header should contain a known document type. For now,
1531  * we don't parse the whole header but simply check for the
1532  * availability of that array of characters inside the header.
1533  * Not fully fool-proof, but good enough. */
1534  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1535  size_t probelen = strlen(matroska_doctypes[i]);
1536  if (total < probelen)
1537  continue;
1538  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1539  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1540  return AVPROBE_SCORE_MAX;
1541  }
1542 
1543  // probably valid EBML header but no recognized doctype
1544  return AVPROBE_SCORE_EXTENSION;
1545 }
1546 
1548  int num)
1549 {
1550  MatroskaTrack *tracks = matroska->tracks.elem;
1551  int i;
1552 
1553  for (i = 0; i < matroska->tracks.nb_elem; i++)
1554  if (tracks[i].num == num)
1555  return &tracks[i];
1556 
1557  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1558  return NULL;
1559 }
1560 
1561 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1562  MatroskaTrack *track)
1563 {
1564  MatroskaTrackEncoding *encodings = track->encodings.elem;
1565  uint8_t *data = *buf;
1566  int isize = *buf_size;
1567  uint8_t *pkt_data = NULL;
1568  uint8_t av_unused *newpktdata;
1569  int pkt_size = isize;
1570  int result = 0;
1571  int olen;
1572 
1573  if (pkt_size >= 10000000U)
1574  return AVERROR_INVALIDDATA;
1575 
1576  switch (encodings[0].compression.algo) {
1578  {
1579  int header_size = encodings[0].compression.settings.size;
1580  uint8_t *header = encodings[0].compression.settings.data;
1581 
1582  if (header_size && !header) {
1583  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1584  return -1;
1585  }
1586 
1587  if (!header_size)
1588  return 0;
1589 
1590  pkt_size = isize + header_size;
1591  pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1592  if (!pkt_data)
1593  return AVERROR(ENOMEM);
1594 
1595  memcpy(pkt_data, header, header_size);
1596  memcpy(pkt_data + header_size, data, isize);
1597  break;
1598  }
1599 #if CONFIG_LZO
1601  do {
1602  olen = pkt_size *= 3;
1603  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1605  if (!newpktdata) {
1606  result = AVERROR(ENOMEM);
1607  goto failed;
1608  }
1609  pkt_data = newpktdata;
1610  result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1611  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1612  if (result) {
1613  result = AVERROR_INVALIDDATA;
1614  goto failed;
1615  }
1616  pkt_size -= olen;
1617  break;
1618 #endif
1619 #if CONFIG_ZLIB
1621  {
1622  z_stream zstream = { 0 };
1623  if (inflateInit(&zstream) != Z_OK)
1624  return -1;
1625  zstream.next_in = data;
1626  zstream.avail_in = isize;
1627  do {
1628  pkt_size *= 3;
1629  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1630  if (!newpktdata) {
1631  inflateEnd(&zstream);
1632  result = AVERROR(ENOMEM);
1633  goto failed;
1634  }
1635  pkt_data = newpktdata;
1636  zstream.avail_out = pkt_size - zstream.total_out;
1637  zstream.next_out = pkt_data + zstream.total_out;
1638  result = inflate(&zstream, Z_NO_FLUSH);
1639  } while (result == Z_OK && pkt_size < 10000000);
1640  pkt_size = zstream.total_out;
1641  inflateEnd(&zstream);
1642  if (result != Z_STREAM_END) {
1643  if (result == Z_MEM_ERROR)
1644  result = AVERROR(ENOMEM);
1645  else
1646  result = AVERROR_INVALIDDATA;
1647  goto failed;
1648  }
1649  break;
1650  }
1651 #endif
1652 #if CONFIG_BZLIB
1654  {
1655  bz_stream bzstream = { 0 };
1656  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1657  return -1;
1658  bzstream.next_in = data;
1659  bzstream.avail_in = isize;
1660  do {
1661  pkt_size *= 3;
1662  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1663  if (!newpktdata) {
1664  BZ2_bzDecompressEnd(&bzstream);
1665  result = AVERROR(ENOMEM);
1666  goto failed;
1667  }
1668  pkt_data = newpktdata;
1669  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1670  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1671  result = BZ2_bzDecompress(&bzstream);
1672  } while (result == BZ_OK && pkt_size < 10000000);
1673  pkt_size = bzstream.total_out_lo32;
1674  BZ2_bzDecompressEnd(&bzstream);
1675  if (result != BZ_STREAM_END) {
1676  if (result == BZ_MEM_ERROR)
1677  result = AVERROR(ENOMEM);
1678  else
1679  result = AVERROR_INVALIDDATA;
1680  goto failed;
1681  }
1682  break;
1683  }
1684 #endif
1685  default:
1686  return AVERROR_INVALIDDATA;
1687  }
1688 
1689  memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1690 
1691  *buf = pkt_data;
1692  *buf_size = pkt_size;
1693  return 0;
1694 
1695 failed:
1696  av_free(pkt_data);
1697  return result;
1698 }
1699 
1701  AVDictionary **metadata, char *prefix)
1702 {
1703  MatroskaTag *tags = list->elem;
1704  char key[1024];
1705  int i;
1706 
1707  for (i = 0; i < list->nb_elem; i++) {
1708  const char *lang = tags[i].lang &&
1709  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1710 
1711  if (!tags[i].name) {
1712  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1713  continue;
1714  }
1715  if (prefix)
1716  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1717  else
1718  av_strlcpy(key, tags[i].name, sizeof(key));
1719  if (tags[i].def || !lang) {
1720  av_dict_set(metadata, key, tags[i].string, 0);
1721  if (tags[i].sub.nb_elem)
1722  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1723  }
1724  if (lang) {
1725  av_strlcat(key, "-", sizeof(key));
1726  av_strlcat(key, lang, sizeof(key));
1727  av_dict_set(metadata, key, tags[i].string, 0);
1728  if (tags[i].sub.nb_elem)
1729  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1730  }
1731  }
1733 }
1734 
1736 {
1737  MatroskaDemuxContext *matroska = s->priv_data;
1738  MatroskaTags *tags = matroska->tags.elem;
1739  int i, j;
1740 
1741  for (i = 0; i < matroska->tags.nb_elem; i++) {
1742  if (tags[i].target.attachuid) {
1743  MatroskaAttachment *attachment = matroska->attachments.elem;
1744  int found = 0;
1745  for (j = 0; j < matroska->attachments.nb_elem; j++) {
1746  if (attachment[j].uid == tags[i].target.attachuid &&
1747  attachment[j].stream) {
1748  matroska_convert_tag(s, &tags[i].tag,
1749  &attachment[j].stream->metadata, NULL);
1750  found = 1;
1751  }
1752  }
1753  if (!found) {
1755  "The tags at index %d refer to a "
1756  "non-existent attachment %"PRId64".\n",
1757  i, tags[i].target.attachuid);
1758  }
1759  } else if (tags[i].target.chapteruid) {
1760  MatroskaChapter *chapter = matroska->chapters.elem;
1761  int found = 0;
1762  for (j = 0; j < matroska->chapters.nb_elem; j++) {
1763  if (chapter[j].uid == tags[i].target.chapteruid &&
1764  chapter[j].chapter) {
1765  matroska_convert_tag(s, &tags[i].tag,
1766  &chapter[j].chapter->metadata, NULL);
1767  found = 1;
1768  }
1769  }
1770  if (!found) {
1772  "The tags at index %d refer to a non-existent chapter "
1773  "%"PRId64".\n",
1774  i, tags[i].target.chapteruid);
1775  }
1776  } else if (tags[i].target.trackuid) {
1777  MatroskaTrack *track = matroska->tracks.elem;
1778  int found = 0;
1779  for (j = 0; j < matroska->tracks.nb_elem; j++) {
1780  if (track[j].uid == tags[i].target.trackuid &&
1781  track[j].stream) {
1782  matroska_convert_tag(s, &tags[i].tag,
1783  &track[j].stream->metadata, NULL);
1784  found = 1;
1785  }
1786  }
1787  if (!found) {
1789  "The tags at index %d refer to a non-existent track "
1790  "%"PRId64".\n",
1791  i, tags[i].target.trackuid);
1792  }
1793  } else {
1794  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1795  tags[i].target.type);
1796  }
1797  }
1798 }
1799 
1801  int64_t pos)
1802 {
1803  uint32_t saved_id = matroska->current_id;
1804  int64_t before_pos = avio_tell(matroska->ctx->pb);
1805  int ret = 0;
1806 
1807  /* seek */
1808  if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1809  /* We don't want to lose our seekhead level, so we add
1810  * a dummy. This is a crude hack. */
1811  if (matroska->num_levels == EBML_MAX_DEPTH) {
1812  av_log(matroska->ctx, AV_LOG_INFO,
1813  "Max EBML element depth (%d) reached, "
1814  "cannot parse further.\n", EBML_MAX_DEPTH);
1815  ret = AVERROR_INVALIDDATA;
1816  } else {
1817  matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1818  matroska->num_levels++;
1819  matroska->current_id = 0;
1820 
1821  ret = ebml_parse(matroska, matroska_segment, matroska);
1822  if (ret == LEVEL_ENDED) {
1823  /* This can only happen if the seek brought us beyond EOF. */
1824  ret = AVERROR_EOF;
1825  }
1826  }
1827  }
1828  /* Seek back - notice that in all instances where this is used
1829  * it is safe to set the level to 1. */
1830  matroska_reset_status(matroska, saved_id, before_pos);
1831 
1832  return ret;
1833 }
1834 
1836 {
1837  EbmlList *seekhead_list = &matroska->seekhead;
1838  int i;
1839 
1840  // we should not do any seeking in the streaming case
1841  if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1842  return;
1843 
1844  for (i = 0; i < seekhead_list->nb_elem; i++) {
1845  MatroskaSeekhead *seekheads = seekhead_list->elem;
1846  uint32_t id = seekheads[i].id;
1847  int64_t pos = seekheads[i].pos + matroska->segment_start;
1848 
1849  MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1850  if (!elem || elem->parsed)
1851  continue;
1852 
1853  elem->pos = pos;
1854 
1855  // defer cues parsing until we actually need cue data.
1856  if (id == MATROSKA_ID_CUES)
1857  continue;
1858 
1859  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1860  // mark index as broken
1861  matroska->cues_parsing_deferred = -1;
1862  break;
1863  }
1864 
1865  elem->parsed = 1;
1866  }
1867 }
1868 
1870 {
1871  EbmlList *index_list;
1873  uint64_t index_scale = 1;
1874  int i, j;
1875 
1876  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1877  return;
1878 
1879  index_list = &matroska->index;
1880  index = index_list->elem;
1881  if (index_list->nb_elem < 2)
1882  return;
1883  if (index[1].time > 1E14 / matroska->time_scale) {
1884  av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1885  return;
1886  }
1887  for (i = 0; i < index_list->nb_elem; i++) {
1888  EbmlList *pos_list = &index[i].pos;
1889  MatroskaIndexPos *pos = pos_list->elem;
1890  for (j = 0; j < pos_list->nb_elem; j++) {
1891  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1892  pos[j].track);
1893  if (track && track->stream)
1894  av_add_index_entry(track->stream,
1895  pos[j].pos + matroska->segment_start,
1896  index[i].time / index_scale, 0, 0,
1898  }
1899  }
1900 }
1901 
1903  int i;
1904 
1905  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1906  return;
1907 
1908  for (i = 0; i < matroska->num_level1_elems; i++) {
1909  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1910  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1911  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1912  matroska->cues_parsing_deferred = -1;
1913  elem->parsed = 1;
1914  break;
1915  }
1916  }
1917 
1918  matroska_add_index_entries(matroska);
1919 }
1920 
1922 {
1923  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1924  int profile;
1925 
1926  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1927  if (strstr(codec_id, aac_profiles[profile]))
1928  break;
1929  return profile + 1;
1930 }
1931 
1932 static int matroska_aac_sri(int samplerate)
1933 {
1934  int sri;
1935 
1936  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1937  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1938  break;
1939  return sri;
1940 }
1941 
1942 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1943 {
1944  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1945  avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1946 }
1947 
1949  MatroskaTrack *track,
1950  int *offset)
1951 {
1952  AVStream *st = track->stream;
1953  uint8_t *p = track->codec_priv.data;
1954  int size = track->codec_priv.size;
1955 
1956  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1957  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1958  track->codec_priv.size = 0;
1959  return 0;
1960  }
1961  *offset = 8;
1962  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1963 
1964  p += track->codec_priv.size;
1965  size -= track->codec_priv.size;
1966 
1967  /* parse the remaining metadata blocks if present */
1968  while (size >= 4) {
1969  int block_last, block_type, block_size;
1970 
1971  flac_parse_block_header(p, &block_last, &block_type, &block_size);
1972 
1973  p += 4;
1974  size -= 4;
1975  if (block_size > size)
1976  return 0;
1977 
1978  /* check for the channel mask */
1979  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1980  AVDictionary *dict = NULL;
1981  AVDictionaryEntry *chmask;
1982 
1983  ff_vorbis_comment(s, &dict, p, block_size, 0);
1984  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1985  if (chmask) {
1986  uint64_t mask = strtol(chmask->value, NULL, 0);
1987  if (!mask || mask & ~0x3ffffULL) {
1989  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1990  } else
1991  st->codecpar->channel_layout = mask;
1992  }
1993  av_dict_free(&dict);
1994  }
1995 
1996  p += block_size;
1997  size -= block_size;
1998  }
1999 
2000  return 0;
2001 }
2002 
2003 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2004 {
2005  int major, minor, micro, bttb = 0;
2006 
2007  /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2008  * this function, and fixed in 57.52 */
2009  if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, &micro) == 3)
2010  bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
2011 
2012  switch (field_order) {
2014  return AV_FIELD_PROGRESSIVE;
2016  return AV_FIELD_UNKNOWN;
2018  return AV_FIELD_TT;
2020  return AV_FIELD_BB;
2022  return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2024  return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2025  default:
2026  return AV_FIELD_UNKNOWN;
2027  }
2028 }
2029 
2030 static void mkv_stereo_mode_display_mul(int stereo_mode,
2031  int *h_width, int *h_height)
2032 {
2033  switch (stereo_mode) {
2039  break;
2044  *h_width = 2;
2045  break;
2050  *h_height = 2;
2051  break;
2052  }
2053 }
2054 
2055 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2056  const MatroskaTrackVideoColor *color = track->video.color.elem;
2057  const MatroskaMasteringMeta *mastering_meta;
2058  int has_mastering_primaries, has_mastering_luminance;
2059 
2060  if (!track->video.color.nb_elem)
2061  return 0;
2062 
2063  mastering_meta = &color->mastering_meta;
2064  // Mastering primaries are CIE 1931 coords, and must be > 0.
2065  has_mastering_primaries =
2066  mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2067  mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2068  mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2069  mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2070  has_mastering_luminance = mastering_meta->max_luminance > 0;
2071 
2074  if (color->primaries != AVCOL_PRI_RESERVED &&
2075  color->primaries != AVCOL_PRI_RESERVED0)
2076  st->codecpar->color_primaries = color->primaries;
2080  if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2081  color->range <= AVCOL_RANGE_JPEG)
2082  st->codecpar->color_range = color->range;
2087  st->codecpar->chroma_location =
2089  (color->chroma_siting_vert - 1) << 7);
2090  }
2091  if (color->max_cll && color->max_fall) {
2092  size_t size = 0;
2093  int ret;
2095  if (!metadata)
2096  return AVERROR(ENOMEM);
2098  (uint8_t *)metadata, size);
2099  if (ret < 0) {
2100  av_freep(&metadata);
2101  return ret;
2102  }
2103  metadata->MaxCLL = color->max_cll;
2104  metadata->MaxFALL = color->max_fall;
2105  }
2106 
2107  if (has_mastering_primaries || has_mastering_luminance) {
2108  AVMasteringDisplayMetadata *metadata =
2111  sizeof(AVMasteringDisplayMetadata));
2112  if (!metadata) {
2113  return AVERROR(ENOMEM);
2114  }
2115  memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2116  if (has_mastering_primaries) {
2117  metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2118  metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2119  metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2120  metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2121  metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2122  metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2123  metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2124  metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2125  metadata->has_primaries = 1;
2126  }
2127  if (has_mastering_luminance) {
2128  metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2129  metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2130  metadata->has_luminance = 1;
2131  }
2132  }
2133  return 0;
2134 }
2135 
2136 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track) {
2137  AVSphericalMapping *spherical;
2138  enum AVSphericalProjection projection;
2139  size_t spherical_size;
2140  uint32_t l = 0, t = 0, r = 0, b = 0;
2141  uint32_t padding = 0;
2142  int ret;
2143  GetByteContext gb;
2144 
2146  track->video.projection.private.size);
2147 
2148  if (bytestream2_get_byte(&gb) != 0) {
2149  av_log(NULL, AV_LOG_WARNING, "Unknown spherical metadata\n");
2150  return 0;
2151  }
2152 
2153  bytestream2_skip(&gb, 3); // flags
2154 
2155  switch (track->video.projection.type) {
2157  if (track->video.projection.private.size == 20) {
2158  t = bytestream2_get_be32(&gb);
2159  b = bytestream2_get_be32(&gb);
2160  l = bytestream2_get_be32(&gb);
2161  r = bytestream2_get_be32(&gb);
2162 
2163  if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2165  "Invalid bounding rectangle coordinates "
2166  "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2167  l, t, r, b);
2168  return AVERROR_INVALIDDATA;
2169  }
2170  } else if (track->video.projection.private.size != 0) {
2171  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2172  return AVERROR_INVALIDDATA;
2173  }
2174 
2175  if (l || t || r || b)
2176  projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2177  else
2178  projection = AV_SPHERICAL_EQUIRECTANGULAR;
2179  break;
2181  if (track->video.projection.private.size < 4) {
2182  av_log(NULL, AV_LOG_ERROR, "Missing projection private properties\n");
2183  return AVERROR_INVALIDDATA;
2184  } else if (track->video.projection.private.size == 12) {
2185  uint32_t layout = bytestream2_get_be32(&gb);
2186  if (layout) {
2188  "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2189  return 0;
2190  }
2191  projection = AV_SPHERICAL_CUBEMAP;
2192  padding = bytestream2_get_be32(&gb);
2193  } else {
2194  av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2195  return AVERROR_INVALIDDATA;
2196  }
2197  break;
2199  /* No Spherical metadata */
2200  return 0;
2201  default:
2203  "Unknown spherical metadata type %"PRIu64"\n",
2204  track->video.projection.type);
2205  return 0;
2206  }
2207 
2208  spherical = av_spherical_alloc(&spherical_size);
2209  if (!spherical)
2210  return AVERROR(ENOMEM);
2211 
2212  spherical->projection = projection;
2213 
2214  spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2215  spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2216  spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2217 
2218  spherical->padding = padding;
2219 
2220  spherical->bound_left = l;
2221  spherical->bound_top = t;
2222  spherical->bound_right = r;
2223  spherical->bound_bottom = b;
2224 
2225  ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2226  spherical_size);
2227  if (ret < 0) {
2228  av_freep(&spherical);
2229  return ret;
2230  }
2231 
2232  return 0;
2233 }
2234 
2235 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2236 {
2237  const AVCodecTag *codec_tags;
2238 
2239  codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2241 
2242  /* Normalize noncompliant private data that starts with the fourcc
2243  * by expanding/shifting the data by 4 bytes and storing the data
2244  * size at the start. */
2245  if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2246  int ret = av_buffer_realloc(&track->codec_priv.buf,
2248  if (ret < 0)
2249  return ret;
2250 
2251  track->codec_priv.data = track->codec_priv.buf->data;
2252  memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2253  track->codec_priv.size += 4;
2254  AV_WB32(track->codec_priv.data, track->codec_priv.size);
2255  }
2256 
2257  *fourcc = AV_RL32(track->codec_priv.data + 4);
2258  *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2259 
2260  return 0;
2261 }
2262 
2264 {
2265  MatroskaDemuxContext *matroska = s->priv_data;
2266  MatroskaTrack *tracks = matroska->tracks.elem;
2267  AVStream *st;
2268  int i, j, ret;
2269  int k;
2270 
2271  for (i = 0; i < matroska->tracks.nb_elem; i++) {
2272  MatroskaTrack *track = &tracks[i];
2274  EbmlList *encodings_list = &track->encodings;
2275  MatroskaTrackEncoding *encodings = encodings_list->elem;
2276  uint8_t *extradata = NULL;
2277  int extradata_size = 0;
2278  int extradata_offset = 0;
2279  uint32_t fourcc = 0;
2280  AVIOContext b;
2281  char* key_id_base64 = NULL;
2282  int bit_depth = -1;
2283 
2284  /* Apply some sanity checks. */
2285  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2286  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2287  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2288  track->type != MATROSKA_TRACK_TYPE_METADATA) {
2289  av_log(matroska->ctx, AV_LOG_INFO,
2290  "Unknown or unsupported track type %"PRIu64"\n",
2291  track->type);
2292  continue;
2293  }
2294  if (!track->codec_id)
2295  continue;
2296 
2297  if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2298  isnan(track->audio.samplerate)) {
2299  av_log(matroska->ctx, AV_LOG_WARNING,
2300  "Invalid sample rate %f, defaulting to 8000 instead.\n",
2301  track->audio.samplerate);
2302  track->audio.samplerate = 8000;
2303  }
2304 
2305  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2306  if (!track->default_duration && track->video.frame_rate > 0) {
2307  double default_duration = 1000000000 / track->video.frame_rate;
2308  if (default_duration > UINT64_MAX || default_duration < 0) {
2309  av_log(matroska->ctx, AV_LOG_WARNING,
2310  "Invalid frame rate %e. Cannot calculate default duration.\n",
2311  track->video.frame_rate);
2312  } else {
2313  track->default_duration = default_duration;
2314  }
2315  }
2316  if (track->video.display_width == -1)
2317  track->video.display_width = track->video.pixel_width;
2318  if (track->video.display_height == -1)
2319  track->video.display_height = track->video.pixel_height;
2320  if (track->video.color_space.size == 4)
2321  fourcc = AV_RL32(track->video.color_space.data);
2322  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2323  if (!track->audio.out_samplerate)
2324  track->audio.out_samplerate = track->audio.samplerate;
2325  }
2326  if (encodings_list->nb_elem > 1) {
2327  av_log(matroska->ctx, AV_LOG_ERROR,
2328  "Multiple combined encodings not supported");
2329  } else if (encodings_list->nb_elem == 1) {
2330  if (encodings[0].type) {
2331  if (encodings[0].encryption.key_id.size > 0) {
2332  /* Save the encryption key id to be stored later as a
2333  metadata tag. */
2334  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2335  key_id_base64 = av_malloc(b64_size);
2336  if (key_id_base64 == NULL)
2337  return AVERROR(ENOMEM);
2338 
2339  av_base64_encode(key_id_base64, b64_size,
2340  encodings[0].encryption.key_id.data,
2341  encodings[0].encryption.key_id.size);
2342  } else {
2343  encodings[0].scope = 0;
2344  av_log(matroska->ctx, AV_LOG_ERROR,
2345  "Unsupported encoding type");
2346  }
2347  } else if (
2348 #if CONFIG_ZLIB
2349  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2350 #endif
2351 #if CONFIG_BZLIB
2353 #endif
2354 #if CONFIG_LZO
2356 #endif
2358  encodings[0].scope = 0;
2359  av_log(matroska->ctx, AV_LOG_ERROR,
2360  "Unsupported encoding type");
2361  } else if (track->codec_priv.size && encodings[0].scope & 2) {
2362  uint8_t *codec_priv = track->codec_priv.data;
2363  int ret = matroska_decode_buffer(&track->codec_priv.data,
2364  &track->codec_priv.size,
2365  track);
2366  if (ret < 0) {
2367  track->codec_priv.data = NULL;
2368  track->codec_priv.size = 0;
2369  av_log(matroska->ctx, AV_LOG_ERROR,
2370  "Failed to decode codec private data\n");
2371  }
2372 
2373  if (codec_priv != track->codec_priv.data) {
2374  av_buffer_unref(&track->codec_priv.buf);
2375  if (track->codec_priv.data) {
2376  track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2378  NULL, NULL, 0);
2379  if (!track->codec_priv.buf) {
2380  av_freep(&track->codec_priv.data);
2381  track->codec_priv.size = 0;
2382  return AVERROR(ENOMEM);
2383  }
2384  }
2385  }
2386  }
2387  }
2388 
2389  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2390  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2391  strlen(ff_mkv_codec_tags[j].str))) {
2392  codec_id = ff_mkv_codec_tags[j].id;
2393  break;
2394  }
2395  }
2396 
2397  st = track->stream = avformat_new_stream(s, NULL);
2398  if (!st) {
2399  av_free(key_id_base64);
2400  return AVERROR(ENOMEM);
2401  }
2402 
2403  if (key_id_base64) {
2404  /* export encryption key id as base64 metadata tag */
2405  av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
2406  av_freep(&key_id_base64);
2407  }
2408 
2409  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2410  track->codec_priv.size >= 40 &&
2411  track->codec_priv.data) {
2412  track->ms_compat = 1;
2413  bit_depth = AV_RL16(track->codec_priv.data + 14);
2414  fourcc = AV_RL32(track->codec_priv.data + 16);
2416  fourcc);
2417  if (!codec_id)
2419  fourcc);
2420  extradata_offset = 40;
2421  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2422  track->codec_priv.size >= 14 &&
2423  track->codec_priv.data) {
2424  int ret;
2425  ffio_init_context(&b, track->codec_priv.data,
2426  track->codec_priv.size,
2427  0, NULL, NULL, NULL, NULL);
2428  ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2429  if (ret < 0)
2430  return ret;
2431  codec_id = st->codecpar->codec_id;
2432  fourcc = st->codecpar->codec_tag;
2433  extradata_offset = FFMIN(track->codec_priv.size, 18);
2434  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2435  /* Normally 36, but allow noncompliant private data */
2436  && (track->codec_priv.size >= 32)
2437  && (track->codec_priv.data)) {
2438  uint16_t sample_size;
2439  int ret = get_qt_codec(track, &fourcc, &codec_id);
2440  if (ret < 0)
2441  return ret;
2442  sample_size = AV_RB16(track->codec_priv.data + 26);
2443  if (fourcc == 0) {
2444  if (sample_size == 8) {
2445  fourcc = MKTAG('r','a','w',' ');
2446  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2447  } else if (sample_size == 16) {
2448  fourcc = MKTAG('t','w','o','s');
2449  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2450  }
2451  }
2452  if ((fourcc == MKTAG('t','w','o','s') ||
2453  fourcc == MKTAG('s','o','w','t')) &&
2454  sample_size == 8)
2455  codec_id = AV_CODEC_ID_PCM_S8;
2456  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2457  (track->codec_priv.size >= 21) &&
2458  (track->codec_priv.data)) {
2459  int ret = get_qt_codec(track, &fourcc, &codec_id);
2460  if (ret < 0)
2461  return ret;
2462  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2463  fourcc = MKTAG('S','V','Q','3');
2464  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2465  }
2466  if (codec_id == AV_CODEC_ID_NONE)
2467  av_log(matroska->ctx, AV_LOG_ERROR,
2468  "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2469  if (track->codec_priv.size >= 86) {
2470  bit_depth = AV_RB16(track->codec_priv.data + 82);
2471  ffio_init_context(&b, track->codec_priv.data,
2472  track->codec_priv.size,
2473  0, NULL, NULL, NULL, NULL);
2474  if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2475  bit_depth &= 0x1F;
2476  track->has_palette = 1;
2477  }
2478  }
2479  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2480  switch (track->audio.bitdepth) {
2481  case 8:
2482  codec_id = AV_CODEC_ID_PCM_U8;
2483  break;
2484  case 24:
2485  codec_id = AV_CODEC_ID_PCM_S24BE;
2486  break;
2487  case 32:
2488  codec_id = AV_CODEC_ID_PCM_S32BE;
2489  break;
2490  }
2491  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2492  switch (track->audio.bitdepth) {
2493  case 8:
2494  codec_id = AV_CODEC_ID_PCM_U8;
2495  break;
2496  case 24:
2497  codec_id = AV_CODEC_ID_PCM_S24LE;
2498  break;
2499  case 32:
2500  codec_id = AV_CODEC_ID_PCM_S32LE;
2501  break;
2502  }
2503  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2504  track->audio.bitdepth == 64) {
2505  codec_id = AV_CODEC_ID_PCM_F64LE;
2506  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2507  int profile = matroska_aac_profile(track->codec_id);
2508  int sri = matroska_aac_sri(track->audio.samplerate);
2509  extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2510  if (!extradata)
2511  return AVERROR(ENOMEM);
2512  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2513  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2514  if (strstr(track->codec_id, "SBR")) {
2515  sri = matroska_aac_sri(track->audio.out_samplerate);
2516  extradata[2] = 0x56;
2517  extradata[3] = 0xE5;
2518  extradata[4] = 0x80 | (sri << 3);
2519  extradata_size = 5;
2520  } else
2521  extradata_size = 2;
2522  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2523  /* Only ALAC's magic cookie is stored in Matroska's track headers.
2524  * Create the "atom size", "tag", and "tag version" fields the
2525  * decoder expects manually. */
2526  extradata_size = 12 + track->codec_priv.size;
2527  extradata = av_mallocz(extradata_size +
2529  if (!extradata)
2530  return AVERROR(ENOMEM);
2531  AV_WB32(extradata, extradata_size);
2532  memcpy(&extradata[4], "alac", 4);
2533  AV_WB32(&extradata[8], 0);
2534  memcpy(&extradata[12], track->codec_priv.data,
2535  track->codec_priv.size);
2536  } else if (codec_id == AV_CODEC_ID_TTA) {
2537  uint8_t *ptr;
2538  if (track->audio.channels > UINT16_MAX ||
2539  track->audio.bitdepth > UINT16_MAX) {
2540  av_log(matroska->ctx, AV_LOG_WARNING,
2541  "Too large audio channel number %"PRIu64
2542  " or bitdepth %"PRIu64". Skipping track.\n",
2543  track->audio.channels, track->audio.bitdepth);
2544  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2545  return AVERROR_INVALIDDATA;
2546  else
2547  continue;
2548  }
2549  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2550  return AVERROR_INVALIDDATA;
2551  extradata_size = 22;
2552  extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2553  if (!extradata)
2554  return AVERROR(ENOMEM);
2555  ptr = extradata;
2556  bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2557  bytestream_put_le16(&ptr, 1);
2558  bytestream_put_le16(&ptr, track->audio.channels);
2559  bytestream_put_le16(&ptr, track->audio.bitdepth);
2560  bytestream_put_le32(&ptr, track->audio.out_samplerate);
2561  bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2562  track->audio.out_samplerate,
2563  AV_TIME_BASE * 1000));
2564  } else if (codec_id == AV_CODEC_ID_RV10 ||
2565  codec_id == AV_CODEC_ID_RV20 ||
2566  codec_id == AV_CODEC_ID_RV30 ||
2567  codec_id == AV_CODEC_ID_RV40) {
2568  extradata_offset = 26;
2569  } else if (codec_id == AV_CODEC_ID_RA_144) {
2570  track->audio.out_samplerate = 8000;
2571  track->audio.channels = 1;
2572  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2573  codec_id == AV_CODEC_ID_COOK ||
2574  codec_id == AV_CODEC_ID_ATRAC3 ||
2575  codec_id == AV_CODEC_ID_SIPR)
2576  && track->codec_priv.data) {
2577  int flavor;
2578 
2579  ffio_init_context(&b, track->codec_priv.data,
2580  track->codec_priv.size,
2581  0, NULL, NULL, NULL, NULL);
2582  avio_skip(&b, 22);
2583  flavor = avio_rb16(&b);
2584  track->audio.coded_framesize = avio_rb32(&b);
2585  avio_skip(&b, 12);
2586  track->audio.sub_packet_h = avio_rb16(&b);
2587  track->audio.frame_size = avio_rb16(&b);
2588  track->audio.sub_packet_size = avio_rb16(&b);
2589  if (flavor < 0 ||
2590  track->audio.coded_framesize <= 0 ||
2591  track->audio.sub_packet_h <= 0 ||
2592  track->audio.frame_size <= 0 ||
2593  track->audio.sub_packet_size <= 0 && codec_id != AV_CODEC_ID_SIPR)
2594  return AVERROR_INVALIDDATA;
2595  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2596  track->audio.frame_size);
2597  if (!track->audio.buf)
2598  return AVERROR(ENOMEM);
2599  if (codec_id == AV_CODEC_ID_RA_288) {
2600  st->codecpar->block_align = track->audio.coded_framesize;
2601  track->codec_priv.size = 0;
2602  } else {
2603  if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2604  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2605  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2606  st->codecpar->bit_rate = sipr_bit_rate[flavor];
2607  }
2608  st->codecpar->block_align = track->audio.sub_packet_size;
2609  extradata_offset = 78;
2610  }
2611  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2612  ret = matroska_parse_flac(s, track, &extradata_offset);
2613  if (ret < 0)
2614  return ret;
2615  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2616  fourcc = AV_RL32(track->codec_priv.data);
2617  } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2618  /* we don't need any value stored in CodecPrivate.
2619  make sure that it's not exported as extradata. */
2620  track->codec_priv.size = 0;
2621  } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2622  /* For now, propagate only the OBUs, if any. Once libavcodec is
2623  updated to handle isobmff style extradata this can be removed. */
2624  extradata_offset = 4;
2625  }
2626  track->codec_priv.size -= extradata_offset;
2627 
2628  if (codec_id == AV_CODEC_ID_NONE)
2629  av_log(matroska->ctx, AV_LOG_INFO,
2630  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2631 
2632  if (track->time_scale < 0.01)
2633  track->time_scale = 1.0;
2634  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2635  1000 * 1000 * 1000); /* 64 bit pts in ns */
2636 
2637  /* convert the delay from ns to the track timebase */
2639  (AVRational){ 1, 1000000000 },
2640  st->time_base);
2641 
2642  st->codecpar->codec_id = codec_id;
2643 
2644  if (strcmp(track->language, "und"))
2645  av_dict_set(&st->metadata, "language", track->language, 0);
2646  av_dict_set(&st->metadata, "title", track->name, 0);
2647 
2648  if (track->flag_default)
2650  if (track->flag_forced)
2652 
2653  if (!st->codecpar->extradata) {
2654  if (extradata) {
2655  st->codecpar->extradata = extradata;
2656  st->codecpar->extradata_size = extradata_size;
2657  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2658  if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2659  return AVERROR(ENOMEM);
2660  memcpy(st->codecpar->extradata,
2661  track->codec_priv.data + extradata_offset,
2662  track->codec_priv.size);
2663  }
2664  }
2665 
2666  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2668  int display_width_mul = 1;
2669  int display_height_mul = 1;
2670 
2672  st->codecpar->codec_tag = fourcc;
2673  if (bit_depth >= 0)
2675  st->codecpar->width = track->video.pixel_width;
2676  st->codecpar->height = track->video.pixel_height;
2677 
2679  st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2682 
2684  mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2685 
2688  &st->sample_aspect_ratio.den,
2689  st->codecpar->height * track->video.display_width * display_width_mul,
2690  st->codecpar->width * track->video.display_height * display_height_mul,
2691  255);
2692  }
2693  if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2695 
2696  if (track->default_duration) {
2698  1000000000, track->default_duration, 30000);
2699 #if FF_API_R_FRAME_RATE
2700  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2701  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2702  st->r_frame_rate = st->avg_frame_rate;
2703 #endif
2704  }
2705 
2706  /* export stereo mode flag as metadata tag */
2708  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2709 
2710  /* export alpha mode flag as metadata tag */
2711  if (track->video.alpha_mode)
2712  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2713 
2714  /* if we have virtual track, mark the real tracks */
2715  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2716  char buf[32];
2717  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2718  continue;
2719  snprintf(buf, sizeof(buf), "%s_%d",
2720  ff_matroska_video_stereo_plane[planes[j].type], i);
2721  for (k=0; k < matroska->tracks.nb_elem; k++)
2722  if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2723  av_dict_set(&tracks[k].stream->metadata,
2724  "stereo_mode", buf, 0);
2725  break;
2726  }
2727  }
2728  // add stream level stereo3d side data if it is a supported format
2730  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2731  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2732  if (ret < 0)
2733  return ret;
2734  }
2735 
2736  ret = mkv_parse_video_color(st, track);
2737  if (ret < 0)
2738  return ret;
2739  ret = mkv_parse_video_projection(st, track);
2740  if (ret < 0)
2741  return ret;
2742  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2744  st->codecpar->codec_tag = fourcc;
2745  st->codecpar->sample_rate = track->audio.out_samplerate;
2746  st->codecpar->channels = track->audio.channels;
2747  if (!st->codecpar->bits_per_coded_sample)
2749  if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2750  st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2753  else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2755  if (track->codec_delay > 0) {
2757  (AVRational){1, 1000000000},
2758  (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2759  48000 : st->codecpar->sample_rate});
2760  }
2761  if (track->seek_preroll > 0) {
2763  (AVRational){1, 1000000000},
2764  (AVRational){1, st->codecpar->sample_rate});
2765  }
2766  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2768 
2769  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2771  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2773  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2775  }
2776  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2778  }
2779  }
2780 
2781  return 0;
2782 }
2783 
2785 {
2786  MatroskaDemuxContext *matroska = s->priv_data;
2787  EbmlList *attachments_list = &matroska->attachments;
2788  EbmlList *chapters_list = &matroska->chapters;
2789  MatroskaAttachment *attachments;
2790  MatroskaChapter *chapters;
2791  uint64_t max_start = 0;
2792  int64_t pos;
2793  Ebml ebml = { 0 };
2794  int i, j, res;
2795 
2796  matroska->ctx = s;
2797  matroska->cues_parsing_deferred = 1;
2798 
2799  /* First read the EBML header. */
2800  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2801  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2802  ebml_free(ebml_syntax, &ebml);
2803  return AVERROR_INVALIDDATA;
2804  }
2805  if (ebml.version > EBML_VERSION ||
2806  ebml.max_size > sizeof(uint64_t) ||
2807  ebml.id_length > sizeof(uint32_t) ||
2808  ebml.doctype_version > 3) {
2810  "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2811  ebml.version, ebml.doctype, ebml.doctype_version);
2812  ebml_free(ebml_syntax, &ebml);
2813  return AVERROR_PATCHWELCOME;
2814  } else if (ebml.doctype_version == 3) {
2815  av_log(matroska->ctx, AV_LOG_WARNING,
2816  "EBML header using unsupported features\n"
2817  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2818  ebml.version, ebml.doctype, ebml.doctype_version);
2819  }
2820  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2821  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2822  break;
2823  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2824  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2825  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2826  ebml_free(ebml_syntax, &ebml);
2827  return AVERROR_INVALIDDATA;
2828  }
2829  }
2830  ebml_free(ebml_syntax, &ebml);
2831 
2832  /* The next thing is a segment. */
2833  pos = avio_tell(matroska->ctx->pb);
2834  res = ebml_parse(matroska, matroska_segments, matroska);
2835  // Try resyncing until we find an EBML_STOP type element.
2836  while (res != 1) {
2837  res = matroska_resync(matroska, pos);
2838  if (res < 0)
2839  goto fail;
2840  pos = avio_tell(matroska->ctx->pb);
2841  res = ebml_parse(matroska, matroska_segment, matroska);
2842  }
2843  /* Set data_offset as it might be needed later by seek_frame_generic. */
2844  if (matroska->current_id == MATROSKA_ID_CLUSTER)
2845  s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2846  matroska_execute_seekhead(matroska);
2847 
2848  if (!matroska->time_scale)
2849  matroska->time_scale = 1000000;
2850  if (matroska->duration)
2851  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2852  1000 / AV_TIME_BASE;
2853  av_dict_set(&s->metadata, "title", matroska->title, 0);
2854  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2855 
2856  if (matroska->date_utc.size == 8)
2858 
2859  res = matroska_parse_tracks(s);
2860  if (res < 0)
2861  goto fail;
2862 
2863  attachments = attachments_list->elem;
2864  for (j = 0; j < attachments_list->nb_elem; j++) {
2865  if (!(attachments[j].filename && attachments[j].mime &&
2866  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2867  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2868  } else {
2869  AVStream *st = avformat_new_stream(s, NULL);
2870  if (!st)
2871  break;
2872  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2873  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2875 
2876  for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2877  if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2878  strlen(ff_mkv_image_mime_tags[i].str))) {
2880  break;
2881  }
2882  }
2883 
2884  attachments[j].stream = st;
2885 
2886  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2887  AVPacket *pkt = &st->attached_pic;
2888 
2891 
2892  av_init_packet(pkt);
2893  pkt->buf = av_buffer_ref(attachments[j].bin.buf);
2894  if (!pkt->buf)
2895  return AVERROR(ENOMEM);
2896  pkt->data = attachments[j].bin.data;
2897  pkt->size = attachments[j].bin.size;
2898  pkt->stream_index = st->index;
2899  pkt->flags |= AV_PKT_FLAG_KEY;
2900  } else {
2902  if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2903  break;
2904  memcpy(st->codecpar->extradata, attachments[j].bin.data,
2905  attachments[j].bin.size);
2906 
2907  for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2908  if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2909  strlen(ff_mkv_mime_tags[i].str))) {
2911  break;
2912  }
2913  }
2914  }
2915  }
2916  }
2917 
2918  chapters = chapters_list->elem;
2919  for (i = 0; i < chapters_list->nb_elem; i++)
2920  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2921  (max_start == 0 || chapters[i].start > max_start)) {
2922  chapters[i].chapter =
2923  avpriv_new_chapter(s, chapters[i].uid,
2924  (AVRational) { 1, 1000000000 },
2925  chapters[i].start, chapters[i].end,
2926  chapters[i].title);
2927  if (chapters[i].chapter) {
2928  av_dict_set(&chapters[i].chapter->metadata,
2929  "title", chapters[i].title, 0);
2930  }
2931  max_start = chapters[i].start;
2932  }
2933 
2934  matroska_add_index_entries(matroska);
2935 
2937 
2938  return 0;
2939 fail:
2941  return res;
2942 }
2943 
2944 /*
2945  * Put one packet in an application-supplied AVPacket struct.
2946  * Returns 0 on success or -1 on failure.
2947  */
2949  AVPacket *pkt)
2950 {
2951  if (matroska->queue) {
2952  MatroskaTrack *tracks = matroska->tracks.elem;
2953  MatroskaTrack *track;
2954 
2955  ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2956  track = &tracks[pkt->stream_index];
2957  if (track->has_palette) {
2959  if (!pal) {
2960  av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
2961  } else {
2962  memcpy(pal, track->palette, AVPALETTE_SIZE);
2963  }
2964  track->has_palette = 0;
2965  }
2966  return 0;
2967  }
2968 
2969  return -1;
2970 }
2971 
2972 /*
2973  * Free all packets in our internal queue.
2974  */
2976 {
2977  ff_packet_list_free(&matroska->queue, &matroska->queue_end);
2978 }
2979 
2981  int size, int type, AVIOContext *pb,
2982  uint32_t lace_size[256], int *laces)
2983 {
2984  int n;
2985  uint8_t *data = *buf;
2986 
2987  if (!type) {
2988  *laces = 1;
2989  lace_size[0] = size;
2990  return 0;
2991  }
2992 
2993  av_assert0(size > 0);
2994  *laces = *data + 1;
2995  data += 1;
2996  size -= 1;
2997 
2998  switch (type) {
2999  case 0x1: /* Xiph lacing */
3000  {
3001  uint8_t temp;
3002  uint32_t total = 0;
3003  for (n = 0; n < *laces - 1; n++) {
3004  lace_size[n] = 0;
3005 
3006  while (1) {
3007  if (size <= total) {
3008  return AVERROR_INVALIDDATA;
3009  }
3010  temp = *data;
3011  total += temp;
3012  lace_size[n] += temp;
3013  data += 1;
3014  size -= 1;
3015  if (temp != 0xff)
3016  break;
3017  }
3018  }
3019  if (size <= total) {
3020  return AVERROR_INVALIDDATA;
3021  }
3022 
3023  lace_size[n] = size - total;
3024  break;
3025  }
3026 
3027  case 0x2: /* fixed-size lacing */
3028  if (size % (*laces)) {
3029  return AVERROR_INVALIDDATA;
3030  }
3031  for (n = 0; n < *laces; n++)
3032  lace_size[n] = size / *laces;
3033  break;
3034 
3035  case 0x3: /* EBML lacing */
3036  {
3037  uint64_t num;
3038  uint64_t total;
3039  int offset;
3040 
3041  avio_skip(pb, 4);
3042 
3043  n = ebml_read_num(matroska, pb, 8, &num, 1);
3044  if (n < 0)
3045  return n;
3046  if (num > INT_MAX)
3047  return AVERROR_INVALIDDATA;
3048 
3049  total = lace_size[0] = num;
3050  offset = n;
3051  for (n = 1; n < *laces - 1; n++) {
3052  int64_t snum;
3053  int r;
3054  r = matroska_ebmlnum_sint(matroska, pb, &snum);
3055  if (r < 0)
3056  return r;
3057  if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3058  return AVERROR_INVALIDDATA;
3059 
3060  lace_size[n] = lace_size[n - 1] + snum;
3061  total += lace_size[n];
3062  offset += r;
3063  }
3064  data += offset;
3065  size -= offset;
3066  if (size <= total) {
3067  return AVERROR_INVALIDDATA;
3068  }
3069  lace_size[*laces - 1] = size - total;
3070  break;
3071  }
3072  }
3073 
3074  *buf = data;
3075 
3076  return 0;
3077 }
3078 
3080  MatroskaTrack *track, AVStream *st,
3081  uint8_t *data, int size, uint64_t timecode,
3082  int64_t pos)
3083 {
3084  int a = st->codecpar->block_align;
3085  int sps = track->audio.sub_packet_size;
3086  int cfs = track->audio.coded_framesize;
3087  int h = track->audio.sub_packet_h;
3088  int y = track->audio.sub_packet_cnt;
3089  int w = track->audio.frame_size;
3090  int x;
3091 
3092  if (!track->audio.pkt_cnt) {
3093  if (track->audio.sub_packet_cnt == 0)
3094  track->audio.buf_timecode = timecode;
3095  if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3096  if (size < cfs * h / 2) {
3097  av_log(matroska->ctx, AV_LOG_ERROR,
3098  "Corrupt int4 RM-style audio packet size\n");
3099  return AVERROR_INVALIDDATA;
3100  }
3101  for (x = 0; x < h / 2; x++)
3102  memcpy(track->audio.buf + x * 2 * w + y * cfs,
3103  data + x * cfs, cfs);
3104  } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3105  if (size < w) {
3106  av_log(matroska->ctx, AV_LOG_ERROR,
3107  "Corrupt sipr RM-style audio packet size\n");
3108  return AVERROR_INVALIDDATA;
3109  }
3110  memcpy(track->audio.buf + y * w, data, w);
3111  } else {
3112  if (size < sps * w / sps || h<=0 || w%sps) {
3113  av_log(matroska->ctx, AV_LOG_ERROR,
3114  "Corrupt generic RM-style audio packet size\n");
3115  return AVERROR_INVALIDDATA;
3116  }
3117  for (x = 0; x < w / sps; x++)
3118  memcpy(track->audio.buf +
3119  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3120  data + x * sps, sps);
3121  }
3122 
3123  if (++track->audio.sub_packet_cnt >= h) {
3124  if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3125  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3126  track->audio.sub_packet_cnt = 0;
3127  track->audio.pkt_cnt = h * w / a;
3128  }
3129  }
3130 
3131  while (track->audio.pkt_cnt) {
3132  int ret;
3133  AVPacket pktl, *pkt = &pktl;
3134 
3135  ret = av_new_packet(pkt, a);
3136  if (ret < 0) {
3137  return ret;
3138  }
3139  memcpy(pkt->data,
3140  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3141  a);
3142  pkt->pts = track->audio.buf_timecode;
3144  pkt->pos = pos;
3145  pkt->stream_index = st->index;
3146  ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3147  if (ret < 0) {
3148  av_packet_unref(pkt);
3149  return AVERROR(ENOMEM);
3150  }
3151  }
3152 
3153  return 0;
3154 }
3155 
3156 /* reconstruct full wavpack blocks from mangled matroska ones */
3158  uint8_t **pdst, int *size)
3159 {
3160  uint8_t *dst = NULL;
3161  int dstlen = 0;
3162  int srclen = *size;
3163  uint32_t samples;
3164  uint16_t ver;
3165  int ret, offset = 0;
3166 
3167  if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
3168  return AVERROR_INVALIDDATA;
3169 
3170  ver = AV_RL16(track->stream->codecpar->extradata);
3171 
3172  samples = AV_RL32(src);
3173  src += 4;
3174  srclen -= 4;
3175 
3176  while (srclen >= 8) {
3177  int multiblock;
3178  uint32_t blocksize;
3179  uint8_t *tmp;
3180 
3181  uint32_t flags = AV_RL32(src);
3182  uint32_t crc = AV_RL32(src + 4);
3183  src += 8;
3184  srclen -= 8;
3185 
3186  multiblock = (flags & 0x1800) != 0x1800;
3187  if (multiblock) {
3188  if (srclen < 4) {
3189  ret = AVERROR_INVALIDDATA;
3190  goto fail;
3191  }
3192  blocksize = AV_RL32(src);
3193  src += 4;
3194  srclen -= 4;
3195  } else
3196  blocksize = srclen;
3197 
3198  if (blocksize > srclen) {
3199  ret = AVERROR_INVALIDDATA;
3200  goto fail;
3201  }
3202 
3203  tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3204  if (!tmp) {
3205  ret = AVERROR(ENOMEM);
3206  goto fail;
3207  }
3208  dst = tmp;
3209  dstlen += blocksize + 32;
3210 
3211  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3212  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3213  AV_WL16(dst + offset + 8, ver); // version
3214  AV_WL16(dst + offset + 10, 0); // track/index_no
3215  AV_WL32(dst + offset + 12, 0); // total samples
3216  AV_WL32(dst + offset + 16, 0); // block index
3217  AV_WL32(dst + offset + 20, samples); // number of samples
3218  AV_WL32(dst + offset + 24, flags); // flags
3219  AV_WL32(dst + offset + 28, crc); // crc
3220  memcpy(dst + offset + 32, src, blocksize); // block data
3221 
3222  src += blocksize;
3223  srclen -= blocksize;
3224  offset += blocksize + 32;
3225  }
3226 
3227  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3228 
3229  *pdst = dst;
3230  *size = dstlen;
3231 
3232  return 0;
3233 
3234 fail:
3235  av_freep(&dst);
3236  return ret;
3237 }
3238 
3240  uint8_t **pdst, int *size)
3241 {
3242  uint8_t *dst;
3243  int dstlen = *size + 8;
3244 
3245  dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3246  if (!dst)
3247  return AVERROR(ENOMEM);
3248 
3249  AV_WB32(dst, dstlen);
3250  AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3251  memcpy(dst + 8, src, dstlen - 8);
3252  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3253 
3254  *pdst = dst;
3255  *size = dstlen;
3256 
3257  return 0;
3258 }
3259 
3261  MatroskaTrack *track,
3262  AVStream *st,
3263  uint8_t *data, int data_len,
3264  uint64_t timecode,
3265  uint64_t duration,
3266  int64_t pos)
3267 {
3268  AVPacket pktl, *pkt = &pktl;
3269  uint8_t *id, *settings, *text, *buf;
3270  int id_len, settings_len, text_len;
3271  uint8_t *p, *q;
3272  int err;
3273 
3274  if (data_len <= 0)
3275  return AVERROR_INVALIDDATA;
3276 
3277  p = data;
3278  q = data + data_len;
3279 
3280  id = p;
3281  id_len = -1;
3282  while (p < q) {
3283  if (*p == '\r' || *p == '\n') {
3284  id_len = p - id;
3285  if (*p == '\r')
3286  p++;
3287  break;
3288  }
3289  p++;
3290  }
3291 
3292  if (p >= q || *p != '\n')
3293  return AVERROR_INVALIDDATA;
3294  p++;
3295 
3296  settings = p;
3297  settings_len = -1;
3298  while (p < q) {
3299  if (*p == '\r' || *p == '\n') {
3300  settings_len = p - settings;
3301  if (*p == '\r')
3302  p++;
3303  break;
3304  }
3305  p++;
3306  }
3307 
3308  if (p >= q || *p != '\n')
3309  return AVERROR_INVALIDDATA;
3310  p++;
3311 
3312  text = p;
3313  text_len = q - p;
3314  while (text_len > 0) {
3315  const int len = text_len - 1;
3316  const uint8_t c = p[len];
3317  if (c != '\r' && c != '\n')
3318  break;
3319  text_len = len;
3320  }
3321 
3322  if (text_len <= 0)
3323  return AVERROR_INVALIDDATA;
3324 
3325  err = av_new_packet(pkt, text_len);
3326  if (err < 0) {
3327  return err;
3328  }
3329 
3330  memcpy(pkt->data, text, text_len);
3331 
3332  if (id_len > 0) {
3333  buf = av_packet_new_side_data(pkt,
3335  id_len);
3336  if (!buf) {
3337  av_packet_unref(pkt);
3338  return AVERROR(ENOMEM);
3339  }
3340  memcpy(buf, id, id_len);
3341  }
3342 
3343  if (settings_len > 0) {
3344  buf = av_packet_new_side_data(pkt,
3346  settings_len);
3347  if (!buf) {
3348  av_packet_unref(pkt);
3349  return AVERROR(ENOMEM);
3350  }
3351  memcpy(buf, settings, settings_len);
3352  }
3353 
3354  // Do we need this for subtitles?
3355  // pkt->flags = AV_PKT_FLAG_KEY;
3356 
3357  pkt->stream_index = st->index;
3358  pkt->pts = timecode;
3359 
3360  // Do we need this for subtitles?
3361  // pkt->dts = timecode;
3362 
3363  pkt->duration = duration;
3364  pkt->pos = pos;
3365 
3366  err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3367  if (err < 0) {
3368  av_packet_unref(pkt);
3369  return AVERROR(ENOMEM);
3370  }
3371 
3372  return 0;
3373 }
3374 
3376  MatroskaTrack *track, AVStream *st,
3377  AVBufferRef *buf, uint8_t *data, int pkt_size,
3378  uint64_t timecode, uint64_t lace_duration,
3379  int64_t pos, int is_keyframe,
3380  uint8_t *additional, uint64_t additional_id, int additional_size,
3381  int64_t discard_padding)
3382 {
3383  MatroskaTrackEncoding *encodings = track->encodings.elem;
3384  uint8_t *pkt_data = data;
3385  int res;
3386  AVPacket pktl, *pkt = &pktl;
3387 
3388  if (encodings && !encodings->type && encodings->scope & 1) {
3389  res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
3390  if (res < 0)
3391  return res;
3392  }
3393 
3394  if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3395  uint8_t *wv_data;
3396  res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
3397  if (res < 0) {
3398  av_log(matroska->ctx, AV_LOG_ERROR,
3399  "Error parsing a wavpack block.\n");
3400  goto fail;
3401  }
3402  if (pkt_data != data)
3403  av_freep(&pkt_data);
3404  pkt_data = wv_data;
3405  }
3406 
3407  if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3408  AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3409  uint8_t *pr_data;
3410  res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
3411  if (res < 0) {
3412  av_log(matroska->ctx, AV_LOG_ERROR,
3413  "Error parsing a prores block.\n");
3414  goto fail;
3415  }
3416  if (pkt_data != data)
3417  av_freep(&pkt_data);
3418  pkt_data = pr_data;
3419  }
3420 
3421  av_init_packet(pkt);
3422  if (pkt_data != data)
3423  pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3424  NULL, NULL, 0);
3425  else
3426  pkt->buf = av_buffer_ref(buf);
3427 
3428  if (!pkt->buf) {
3429  res = AVERROR(ENOMEM);
3430  goto fail;
3431  }
3432 
3433  pkt->data = pkt_data;
3434  pkt->size = pkt_size;
3435  pkt->flags = is_keyframe;
3436  pkt->stream_index = st->index;
3437 
3438  if (additional_size > 0) {
3439  uint8_t *side_data = av_packet_new_side_data(pkt,
3441  additional_size + 8);
3442  if (!side_data) {
3443  av_packet_unref(pkt);
3444  return AVERROR(ENOMEM);
3445  }
3446  AV_WB64(side_data, additional_id);
3447  memcpy(side_data + 8, additional, additional_size);
3448  }
3449 
3450  if (discard_padding) {
3451  uint8_t *side_data = av_packet_new_side_data(pkt,
3453  10);
3454  if (!side_data) {
3455  av_packet_unref(pkt);
3456  return AVERROR(ENOMEM);
3457  }
3458  discard_padding = av_rescale_q(discard_padding,
3459  (AVRational){1, 1000000000},
3460  (AVRational){1, st->codecpar->sample_rate});
3461  if (discard_padding > 0) {
3462  AV_WL32(side_data + 4, discard_padding);
3463  } else {
3464  AV_WL32(side_data, -discard_padding);
3465  }
3466  }
3467 
3468  if (track->ms_compat)
3469  pkt->dts = timecode;
3470  else
3471  pkt->pts = timecode;
3472  pkt->pos = pos;
3473  pkt->duration = lace_duration;
3474 
3475 #if FF_API_CONVERGENCE_DURATION
3477  if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3478  pkt->convergence_duration = lace_duration;
3479  }
3481 #endif
3482 
3483  res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3484  if (res < 0) {
3485  av_packet_unref(pkt);
3486  return AVERROR(ENOMEM);
3487  }
3488 
3489  return 0;
3490 
3491 fail:
3492  if (pkt_data != data)
3493  av_freep(&pkt_data);
3494  return res;
3495 }
3496 
3498  int size, int64_t pos, uint64_t cluster_time,
3499  uint64_t block_duration, int is_keyframe,
3500  uint8_t *additional, uint64_t additional_id, int additional_size,
3501  int64_t cluster_pos, int64_t discard_padding)
3502 {
3503  uint64_t timecode = AV_NOPTS_VALUE;
3504  MatroskaTrack *track;
3505  AVIOContext pb;
3506  int res = 0;
3507  AVStream *st;
3508  int16_t block_time;
3509  uint32_t lace_size[256];
3510  int n, flags, laces = 0;
3511  uint64_t num;
3512  int trust_default_duration = 1;
3513 
3514  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3515 
3516  if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3517  return n;
3518  data += n;
3519  size -= n;
3520 
3521  track = matroska_find_track_by_num(matroska, num);
3522  if (!track || !track->stream) {
3523  av_log(matroska->ctx, AV_LOG_INFO,
3524  "Invalid stream %"PRIu64"\n", num);
3525  return AVERROR_INVALIDDATA;
3526  } else if (size <= 3)
3527  return 0;
3528  st = track->stream;
3529  if (st->discard >= AVDISCARD_ALL)
3530  return res;
3531  av_assert1(block_duration != AV_NOPTS_VALUE);
3532 
3533  block_time = sign_extend(AV_RB16(data), 16);
3534  data += 2;
3535  flags = *data++;
3536  size -= 3;
3537  if (is_keyframe == -1)
3538  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3539 
3540  if (cluster_time != (uint64_t) -1 &&
3541  (block_time >= 0 || cluster_time >= -block_time)) {
3542  timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3543  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3544  timecode < track->end_timecode)
3545  is_keyframe = 0; /* overlapping subtitles are not key frame */
3546  if (is_keyframe) {
3547  ff_reduce_index(matroska->ctx, st->index);
3548  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3550  }
3551  }
3552 
3553  if (matroska->skip_to_keyframe &&
3554  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3555  // Compare signed timecodes. Timecode may be negative due to codec delay
3556  // offset. We don't support timestamps greater than int64_t anyway - see
3557  // AVPacket's pts.
3558  if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3559  return res;
3560  if (is_keyframe)
3561  matroska->skip_to_keyframe = 0;
3562  else if (!st->skip_to_keyframe) {
3563  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3564  matroska->skip_to_keyframe = 0;
3565  }
3566  }
3567 
3568  res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3569  &pb, lace_size, &laces);
3570  if (res < 0) {
3571  av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3572  return res;
3573  }
3574 
3575  if (track->audio.samplerate == 8000) {
3576  // If this is needed for more codecs, then add them here
3577  if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3578  if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3579  trust_default_duration = 0;
3580  }
3581  }
3582 
3583  if (!block_duration && trust_default_duration)
3584  block_duration = track->default_duration * laces / matroska->time_scale;
3585 
3586  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3587  track->end_timecode =
3588  FFMAX(track->end_timecode, timecode + block_duration);
3589 
3590  for (n = 0; n < laces; n++) {
3591  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3592 
3593  if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
3597  st->codecpar->block_align && track->audio.sub_packet_size) {
3598  res = matroska_parse_rm_audio(matroska, track, st, data,
3599  lace_size[n],
3600  timecode, pos);
3601  if (res)
3602  return res;
3603 
3604  } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3605  res = matroska_parse_webvtt(matroska, track, st,
3606  data, lace_size[n],
3607  timecode, lace_duration,
3608  pos);
3609  if (res)
3610  return res;
3611  } else {
3612  res = matroska_parse_frame(matroska, track, st, buf, data, lace_size[n],
3613  timecode, lace_duration, pos,
3614  !n ? is_keyframe : 0,
3615  additional, additional_id, additional_size,
3616  discard_padding);
3617  if (res)
3618  return res;
3619  }
3620 
3621  if (timecode != AV_NOPTS_VALUE)
3622  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3623  data += lace_size[n];
3624  }
3625 
3626  return 0;
3627 }
3628 
3630 {
3631  MatroskaCluster *cluster = &matroska->current_cluster;
3632  MatroskaBlock *block = &cluster->block;
3633  int res;
3634 
3635  av_assert0(matroska->num_levels <= 2);
3636 
3637  if (matroska->num_levels == 1) {
3638  res = ebml_parse(matroska, matroska_segment, NULL);
3639 
3640  if (res == 1) {
3641  /* Found a cluster: subtract the size of the ID already read. */
3642  cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3643 
3644  res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3645  if (res < 0)
3646  return res;
3647  }
3648  }
3649 
3650  if (matroska->num_levels == 2) {
3651  /* We are inside a cluster. */
3652  res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3653 
3654  if (res >= 0 && block->bin.size > 0) {
3655  int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3656  uint8_t* additional = block->additional.size > 0 ?
3657  block->additional.data : NULL;
3658 
3659  res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3660  block->bin.size, block->bin.pos,
3661  cluster->timecode, block->duration,
3662  is_keyframe, additional, block->additional_id,
3663  block->additional.size, cluster->pos,
3664  block->discard_padding);
3665  }
3666 
3667  ebml_free(matroska_blockgroup, block);
3668  memset(block, 0, sizeof(*block));
3669  } else if (!matroska->num_levels) {
3670  if (!avio_feof(matroska->ctx->pb)) {
3671  avio_r8(matroska->ctx->pb);
3672  if (!avio_feof(matroska->ctx->pb)) {
3673  av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3674  "end of segment.\n");
3675  return AVERROR_INVALIDDATA;
3676  }
3677  }
3678  matroska->done = 1;
3679  return AVERROR_EOF;
3680  }
3681 
3682  return res;
3683 }
3684 
3686 {
3687  MatroskaDemuxContext *matroska = s->priv_data;
3688  int ret = 0;
3689 
3690  if (matroska->resync_pos == -1) {
3691  // This can only happen if generic seeking has been used.
3692  matroska->resync_pos = avio_tell(s->pb);
3693  }
3694 
3695  while (matroska_deliver_packet(matroska, pkt)) {
3696  if (matroska->done)
3697  return (ret < 0) ? ret : AVERROR_EOF;
3698  if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3699  ret = matroska_resync(matroska, matroska->resync_pos);
3700  }
3701 
3702  return 0;
3703 }
3704 
3705 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3706  int64_t timestamp, int flags)
3707 {
3708  MatroskaDemuxContext *matroska = s->priv_data;
3709  MatroskaTrack *tracks = NULL;
3710  AVStream *st = s->streams[stream_index];
3711  int i, index;
3712 
3713  /* Parse the CUES now since we need the index data to seek. */
3714  if (matroska->cues_parsing_deferred > 0) {
3715  matroska->cues_parsing_deferred = 0;
3716  matroska_parse_cues(matroska);
3717  }
3718 
3719  if (!st->nb_index_entries)
3720  goto err;
3721  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3722 
3723  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3724  matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3725  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3726  matroska_clear_queue(matroska);
3727  if (matroska_parse_cluster(matroska) < 0)
3728  break;
3729  }
3730  }
3731 
3732  matroska_clear_queue(matroska);
3733  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3734  goto err;
3735 
3736  tracks = matroska->tracks.elem;
3737  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3738  tracks[i].audio.pkt_cnt = 0;
3739  tracks[i].audio.sub_packet_cnt = 0;
3740  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3741  tracks[i].end_timecode = 0;
3742  }
3743 
3744  /* We seek to a level 1 element, so set the appropriate status. */
3745  matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3746  if (flags & AVSEEK_FLAG_ANY) {
3747  st->skip_to_keyframe = 0;
3748  matroska->skip_to_timecode = timestamp;
3749  } else {
3750  st->skip_to_keyframe = 1;
3751  matroska->skip_to_timecode = st->index_entries[index].timestamp;
3752  }
3753  matroska->skip_to_keyframe = 1;
3754  matroska->done = 0;
3755  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3756  return 0;
3757 err:
3758  // slightly hackish but allows proper fallback to
3759  // the generic seeking code.
3760  matroska_reset_status(matroska, 0, -1);
3761  matroska->resync_pos = -1;
3762  matroska_clear_queue(matroska);
3763  st->skip_to_keyframe =
3764  matroska->skip_to_keyframe = 0;
3765  matroska->done = 0;
3766  return -1;
3767 }
3768 
3770 {
3771  MatroskaDemuxContext *matroska = s->priv_data;
3772  MatroskaTrack *tracks = matroska->tracks.elem;
3773  int n;
3774 
3775  matroska_clear_queue(matroska);
3776 
3777  for (n = 0; n < matroska->tracks.nb_elem; n++)
3778  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3779  av_freep(&tracks[n].audio.buf);
3780  ebml_free(matroska_segment, matroska);
3781 
3782  return 0;
3783 }
3784 
3785 typedef struct {
3786  int64_t start_time_ns;
3787  int64_t end_time_ns;
3788  int64_t start_offset;
3789  int64_t end_offset;
3790 } CueDesc;
3791 
3792 /* This function searches all the Cues and returns the CueDesc corresponding to
3793  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3794  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3795  */
3796 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3797  MatroskaDemuxContext *matroska = s->priv_data;
3798  CueDesc cue_desc;
3799  int i;
3800  int nb_index_entries = s->streams[0]->nb_index_entries;
3801  AVIndexEntry *index_entries = s->streams[0]->index_entries;
3802  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3803  for (i = 1; i < nb_index_entries; i++) {
3804  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3805  index_entries[i].timestamp * matroska->time_scale > ts) {
3806  break;
3807  }
3808  }
3809  --i;
3810  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3811  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3812  if (i != nb_index_entries - 1) {
3813  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3814  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3815  } else {
3816  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3817  // FIXME: this needs special handling for files where Cues appear
3818  // before Clusters. the current logic assumes Cues appear after
3819  // Clusters.
3820  cue_desc.end_offset = cues_start - matroska->segment_start;
3821  }
3822  return cue_desc;
3823 }
3824 
3826 {
3827  MatroskaDemuxContext *matroska = s->priv_data;
3828  uint32_t id = matroska->current_id;
3829  int64_t cluster_pos, before_pos;
3830  int index, rv = 1;
3831  if (s->streams[0]->nb_index_entries <= 0) return 0;
3832  // seek to the first cluster using cues.
3833  index = av_index_search_timestamp(s->streams[0], 0, 0);
3834  if (index < 0) return 0;
3835  cluster_pos = s->streams[0]->index_entries[index].pos;
3836  before_pos = avio_tell(s->pb);
3837  while (1) {
3838  uint64_t cluster_id, cluster_length;
3839  int read;
3840  AVPacket *pkt;
3841  avio_seek(s->pb, cluster_pos, SEEK_SET);
3842  // read cluster id and length
3843  read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3844  if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3845  break;
3846  read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3847  if (read < 0)
3848  break;
3849 
3850  matroska_reset_status(matroska, 0, cluster_pos);
3851  matroska_clear_queue(matroska);
3852  if (matroska_parse_cluster(matroska) < 0 ||
3853  !matroska->queue) {
3854  break;
3855  }
3856  pkt = &matroska->queue->pkt;
3857  // 4 + read is the length of the cluster id and the cluster length field.
3858  cluster_pos += 4 + read + cluster_length;
3859  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3860  rv = 0;
3861  break;
3862  }
3863  }
3864 
3865  /* Restore the status after matroska_read_header: */
3866  matroska_reset_status(matroska, id, before_pos);
3867 
3868  return rv;
3869 }
3870 
3871 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3872  double min_buffer, double* buffer,
3873  double* sec_to_download, AVFormatContext *s,
3874  int64_t cues_start)
3875 {
3876  double nano_seconds_per_second = 1000000000.0;
3877  double time_sec = time_ns / nano_seconds_per_second;
3878  int rv = 0;
3879  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3880  int64_t end_time_ns = time_ns + time_to_search_ns;
3881  double sec_downloaded = 0.0;
3882  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3883  if (desc_curr.start_time_ns == -1)
3884  return -1;
3885  *sec_to_download = 0.0;
3886 
3887  // Check for non cue start time.
3888  if (time_ns > desc_curr.start_time_ns) {
3889  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3890  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3891  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3892  double timeToDownload = (cueBytes * 8.0) / bps;
3893 
3894  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3895  *sec_to_download += timeToDownload;
3896 
3897  // Check if the search ends within the first cue.
3898  if (desc_curr.end_time_ns >= end_time_ns) {
3899  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3900  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3901  sec_downloaded = percent_to_sub * sec_downloaded;
3902  *sec_to_download = percent_to_sub * *sec_to_download;
3903  }
3904 
3905  if ((sec_downloaded + *buffer) <= min_buffer) {
3906  return 1;
3907  }
3908 
3909  // Get the next Cue.
3910  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3911  }
3912 
3913  while (desc_curr.start_time_ns != -1) {
3914  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3915  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3916  double desc_sec = desc_ns / nano_seconds_per_second;
3917  double bits = (desc_bytes * 8.0);
3918  double time_to_download = bits / bps;
3919 
3920  sec_downloaded += desc_sec - time_to_download;
3921  *sec_to_download += time_to_download;
3922 
3923  if (desc_curr.end_time_ns >= end_time_ns) {
3924  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3925  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3926  sec_downloaded = percent_to_sub * sec_downloaded;
3927  *sec_to_download = percent_to_sub * *sec_to_download;
3928 
3929  if ((sec_downloaded + *buffer) <= min_buffer)
3930  rv = 1;
3931  break;
3932  }
3933 
3934  if ((sec_downloaded + *buffer) <= min_buffer) {
3935  rv = 1;
3936  break;
3937  }
3938 
3939  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3940  }
3941  *buffer = *buffer + sec_downloaded;
3942  return rv;
3943 }
3944 
3945 /* This function computes the bandwidth of the WebM file with the help of
3946  * buffer_size_after_time_downloaded() function. Both of these functions are
3947  * adapted from WebM Tools project and are adapted to work with FFmpeg's
3948  * Matroska parsing mechanism.
3949  *
3950  * Returns the bandwidth of the file on success; -1 on error.
3951  * */
3952 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3953 {
3954  MatroskaDemuxContext *matroska = s->priv_data;
3955  AVStream *st = s->streams[0];
3956  double bandwidth = 0.0;
3957  int i;
3958 
3959  for (i = 0; i < st->nb_index_entries; i++) {
3960  int64_t prebuffer_ns = 1000000000;
3961  int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3962  double nano_seconds_per_second = 1000000000.0;
3963  int64_t prebuffered_ns = time_ns + prebuffer_ns;
3964  double prebuffer_bytes = 0.0;
3965  int64_t temp_prebuffer_ns = prebuffer_ns;
3966  int64_t pre_bytes, pre_ns;
3967  double pre_sec, prebuffer, bits_per_second;
3968  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3969 
3970  // Start with the first Cue.
3971  CueDesc desc_end = desc_beg;
3972 
3973  // Figure out how much data we have downloaded for the prebuffer. This will
3974  // be used later to adjust the bits per sample to try.
3975  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3976  // Prebuffered the entire Cue.
3977  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3978  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3979  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3980  }
3981  if (desc_end.start_time_ns == -1) {
3982  // The prebuffer is larger than the duration.
3983  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3984  return -1;
3985  bits_per_second = 0.0;
3986  } else {
3987  // The prebuffer ends in the last Cue. Estimate how much data was
3988  // prebuffered.
3989  pre_bytes = desc_end.end_offset - desc_end.start_offset;
3990  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3991  pre_sec = pre_ns / nano_seconds_per_second;
3992  prebuffer_bytes +=
3993  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3994 
3995  prebuffer = prebuffer_ns / nano_seconds_per_second;
3996 
3997  // Set this to 0.0 in case our prebuffer buffers the entire video.
3998  bits_per_second = 0.0;
3999  do {
4000  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4001  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4002  double desc_sec = desc_ns / nano_seconds_per_second;
4003  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4004 
4005  // Drop the bps by the percentage of bytes buffered.
4006  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4007  double mod_bits_per_second = calc_bits_per_second * percent;
4008 
4009  if (prebuffer < desc_sec) {
4010  double search_sec =
4011  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4012 
4013  // Add 1 so the bits per second should be a little bit greater than file
4014  // datarate.
4015  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4016  const double min_buffer = 0.0;
4017  double buffer = prebuffer;
4018  double sec_to_download = 0.0;
4019 
4020  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4021  min_buffer, &buffer, &sec_to_download,
4022  s, cues_start);
4023  if (rv < 0) {
4024  return -1;
4025  } else if (rv == 0) {
4026  bits_per_second = (double)(bps);
4027  break;
4028  }
4029  }
4030 
4031  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4032  } while (desc_end.start_time_ns != -1);
4033  }
4034  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4035  }
4036  return (int64_t)bandwidth;
4037 }
4038 
4039 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4040 {
4041  MatroskaDemuxContext *matroska = s->priv_data;
4042  EbmlList *seekhead_list = &matroska->seekhead;
4043  MatroskaSeekhead *seekhead = seekhead_list->elem;
4044  char *buf;
4045  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4046  int i;
4047  int end = 0;
4048 
4049  // determine cues start and end positions
4050  for (i = 0; i < seekhead_list->nb_elem; i++)
4051  if (seekhead[i].id == MATROSKA_ID_CUES)
4052  break;
4053 
4054  if (i >= seekhead_list->nb_elem) return -1;
4055 
4056  before_pos = avio_tell(matroska->ctx->pb);
4057  cues_start = seekhead[i].pos + matroska->segment_start;
4058  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4059  // cues_end is computed as cues_start + cues_length + length of the
4060  // Cues element ID (i.e. 4) + EBML length of the Cues element.
4061  // cues_end is inclusive and the above sum is reduced by 1.
4062  uint64_t cues_length, cues_id;
4063  int bytes_read;
4064  bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4065  if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4066  return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4067  bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4068  if (bytes_read < 0)
4069  return bytes_read;
4070  cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4071  }
4072  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4073  if (cues_start == -1 || cues_end == -1) return -1;
4074 
4075  // parse the cues
4076  matroska_parse_cues(matroska);
4077 
4078  // cues start
4079  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4080 
4081  // cues end
4082  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4083 
4084  // if the file has cues at the start, fix up the init range so that
4085  // it does not include it
4086  if (cues_start <= init_range)
4087  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4088 
4089  // bandwidth
4090  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4091  if (bandwidth < 0) return -1;
4092  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4093 
4094  // check if all clusters start with key frames
4096 
4097  // store cue point timestamps as a comma separated list for checking subsegment alignment in
4098  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4099  buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4100  if (!buf) return -1;
4101  strcpy(buf, "");
4102  for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4103  int ret = snprintf(buf + end, 20,
4104  "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4105  i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4106  if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4107  av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4108  av_free(buf);
4109  return AVERROR_INVALIDDATA;
4110  }
4111  end += ret;
4112  }
4113  av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
4114  av_free(buf);
4115 
4116  return 0;
4117 }
4118 
4120 {
4121  char *buf;
4122  int ret = matroska_read_header(s);
4123  int64_t init_range;
4124  MatroskaTrack *tracks;
4125  MatroskaDemuxContext *matroska = s->priv_data;
4126  if (ret) {
4127  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4128  return -1;
4129  }
4130  if (!s->nb_streams) {
4132  av_log(s, AV_LOG_ERROR, "No streams found\n");
4133  return AVERROR_INVALIDDATA;
4134  }
4135 
4136  if (!matroska->is_live) {
4137  buf = av_asprintf("%g", matroska->duration);
4138  if (!buf) return AVERROR(ENOMEM);
4139  av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
4140  av_free(buf);
4141 
4142  // initialization range
4143  // 5 is the offset of Cluster ID.
4144  init_range = avio_tell(s->pb) - 5;
4145  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4146  }
4147 
4148  // basename of the file
4149  buf = strrchr(s->url, '/');
4150  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4151 
4152  // track number
4153  tracks = matroska->tracks.elem;
4154  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4155 
4156  // parse the cues and populate Cue related fields
4157  if (!matroska->is_live) {
4158  ret = webm_dash_manifest_cues(s, init_range);
4159  if (ret < 0) {
4160  av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4161  return ret;
4162  }
4163  }
4164 
4165  // use the bandwidth from the command line if it was provided
4166  if (matroska->bandwidth > 0) {
4168  matroska->bandwidth, 0);
4169  }
4170  return 0;
4171 }
4172 
4174 {
4175  return AVERROR_EOF;
4176 }
4177 
4178 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4179 static const AVOption options[] = {
4180  { "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 },
4181  { "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 },
4182  { NULL },
4183 };
4184 
4185 static const AVClass webm_dash_class = {
4186  .class_name = "WebM DASH Manifest demuxer",
4187  .item_name = av_default_item_name,
4188  .option = options,
4189  .version = LIBAVUTIL_VERSION_INT,
4190 };
4191 
4193  .name = "matroska,webm",
4194  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4195  .extensions = "mkv,mk3d,mka,mks",
4196  .priv_data_size = sizeof(MatroskaDemuxContext),
4202  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4203 };
4204 
4206  .name = "webm_dash_manifest",
4207  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4208  .priv_data_size = sizeof(MatroskaDemuxContext),
4212  .priv_class = &webm_dash_class,
4213 };
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:4061
#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:4052
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:3079
Bytestream IO Context.
Definition: avio.h:161
enum AVColorTransferCharacteristic color_trc
Definition: avcodec.h:4059
#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:1735
#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
union EbmlSyntax::@271 def
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1346
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:4173
#define MATROSKA_ID_TRACKENTRY
Definition: matroska.h:75
static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
Definition: matroskadec.c:2948
#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:4192
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:2050
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:3159
#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:1503
static int webm_clusters_start_with_keyframe(AVFormatContext *s)
Definition: matroskadec.c:3825
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:4930
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:2520
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
#define MATROSKA_ID_TRACKFLAGDEFAULT
Definition: matroska.h:99
uint64_t additional_id
Definition: matroskadec.c:322
EbmlList tag
Definition: matroskadec.c:304
uint64_t uid
Definition: matroskadec.c:231
int64_t data_offset
offset of the first packet
Definition: internal.h:80
static EbmlSyntax matroska_segments[]
Definition: matroskadec.c:704
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
MatroskaCluster current_cluster
Definition: matroskadec.c:382
uint32_t fourcc
Definition: vaapi_decode.c:238
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:3971
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:1484
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:817
#define MATROSKA_ID_VIDEOPROJECTIONTYPE
Definition: matroska.h:157
MatroskaLevel levels[EBML_MAX_DEPTH]
Definition: matroskadec.c:344
static EbmlSyntax matroska_track_audio[]
Definition: matroskadec.c:495
static AVPacket pkt
#define MATROSKA_ID_CUECLUSTERPOSITION
Definition: matroska.h:196
#define MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX
Definition: matroska.h:153
static int ebml_read_binary(AVIOContext *pb, int length, int64_t pos, EbmlBin *bin)
Definition: matroskadec.c:980
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:788
MatroskaTrackAudio audio
Definition: matroskadec.c:243
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ
Definition: matroska.h:135
uint64_t duration
Definition: matroskadec.c:318
#define src
Definition: vp8dsp.c:254
const struct EbmlSyntax * n
Definition: matroskadec.c:107
#define MATROSKA_ID_EDITIONFLAGDEFAULT
Definition: matroska.h:260
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define MATROSKA_ID_CLUSTERTIMECODE
Definition: matroska.h:224
#define EBML_ID_DOCTYPE
Definition: matroska.h:40
static const struct @322 planes[]
#define MATROSKA_ID_ENCODINGENCALGO
Definition: matroska.h:180
static EbmlSyntax matroska_attachment[]
Definition: matroskadec.c:584
#define MATROSKA_ID_CHAPTERTIMEEND
Definition: matroska.h:253
enum AVColorSpace color_space
Definition: avcodec.h:4060
#define MATROSKA_ID_TRACKCONTENTENCODINGS
Definition: matroska.h:105
int frame_size
Audio only.
Definition: avcodec.h:4092
Mastering display metadata (based on SMPTE-2086:2014).
Definition: avcodec.h:1372
#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:4631
#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:2149
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: utils.c:1964
#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:4119
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:1978
#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:1117
uint64_t pixel_height
Definition: matroskadec.c:192
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
#define MATROSKA_ID_VIDEOCOLOR_BX
Definition: matroska.h:149
#define MATROSKA_ID_CHAPLANG
Definition: matroska.h:256
#define av_malloc(s)
uint64_t stereo_mode
Definition: matroskadec.c:197
MatroskaTrackOperation operation
Definition: matroskadec.c:244
MatroskaTrackVideo video
Definition: matroskadec.c:242
#define MATROSKA_ID_EDITIONFLAGORDERED
Definition: matroska.h:261
int width
Video only.
Definition: avcodec.h:4037
static EbmlSyntax matroska_cluster_parsing[8]
Definition: matroskadec.c:397
static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start)
Definition: matroskadec.c:3796
static const AVProfile aac_profiles[]
void * elem
Definition: matroskadec.c:114
AVOptions.
#define MATROSKA_ID_TRACKLANGUAGE
Definition: matroska.h:97
MatroskaTrackCompression compression
Definition: matroskadec.c:145