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"
52 
53 #include "avformat.h"
54 #include "avio_internal.h"
55 #include "internal.h"
56 #include "isom.h"
57 #include "matroska.h"
58 #include "oggdec.h"
59 /* For ff_codec_get_id(). */
60 #include "riff.h"
61 #include "rmsipr.h"
62 
63 #if CONFIG_BZLIB
64 #include <bzlib.h>
65 #endif
66 #if CONFIG_ZLIB
67 #include <zlib.h>
68 #endif
69 
70 #include "qtpalette.h"
71 
72 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
73 #define NEEDS_CHECKING 2 /* Indicates that some error checks
74  * still need to be performed */
75 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
76  * syntax level used for parsing ended. */
77 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
78  * of unkown, potentially damaged data is encountered,
79  * it is considered an error. */
80 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
81  * to this many bytes of unknown data for the
82  * SKIP_THRESHOLD check. */
83 
84 typedef enum {
96 } EbmlType;
97 
98 typedef struct CountedElement {
99  union {
100  uint64_t u;
101  int64_t i;
102  double f;
103  char *s;
104  } el;
105  unsigned count;
107 
108 typedef const struct EbmlSyntax {
109  uint32_t id;
113  size_t data_offset;
114  union {
115  int64_t i;
116  uint64_t u;
117  double f;
118  const char *s;
119  const struct EbmlSyntax *n;
120  } def;
121 } EbmlSyntax;
122 
123 typedef struct EbmlList {
124  int nb_elem;
125  unsigned int alloc_elem_size;
126  void *elem;
127 } EbmlList;
128 
129 typedef struct EbmlBin {
130  int size;
133  int64_t pos;
134 } EbmlBin;
135 
136 typedef struct Ebml {
137  uint64_t version;
138  uint64_t max_size;
139  uint64_t id_length;
140  char *doctype;
141  uint64_t doctype_version;
142 } Ebml;
143 
144 typedef struct MatroskaTrackCompression {
145  uint64_t algo;
148 
149 typedef struct MatroskaTrackEncryption {
150  uint64_t algo;
153 
154 typedef struct MatroskaTrackEncoding {
155  uint64_t scope;
156  uint64_t type;
160 
161 typedef struct MatroskaMasteringMeta {
162  double r_x;
163  double r_y;
164  double g_x;
165  double g_y;
166  double b_x;
167  double b_y;
168  double white_x;
169  double white_y;
173 
174 typedef struct MatroskaTrackVideoColor {
177  uint64_t chroma_sub_horz;
178  uint64_t chroma_sub_vert;
179  uint64_t cb_sub_horz;
180  uint64_t cb_sub_vert;
183  uint64_t range;
185  uint64_t primaries;
186  uint64_t max_cll;
187  uint64_t max_fall;
190 
192  uint64_t type;
193  EbmlBin private;
194  double yaw;
195  double pitch;
196  double roll;
198 
199 typedef struct MatroskaTrackVideo {
200  double frame_rate;
201  uint64_t display_width;
202  uint64_t display_height;
203  uint64_t pixel_width;
204  uint64_t pixel_height;
206  uint64_t display_unit;
207  uint64_t interlaced;
208  uint64_t field_order;
209  uint64_t stereo_mode;
210  uint64_t alpha_mode;
214 
215 typedef struct MatroskaTrackAudio {
216  double samplerate;
218  uint64_t bitdepth;
219  uint64_t channels;
220 
221  /* real audio header (extracted from extradata) */
227  int pkt_cnt;
228  uint64_t buf_timecode;
231 
232 typedef struct MatroskaTrackPlane {
233  uint64_t uid;
234  uint64_t type;
236 
237 typedef struct MatroskaTrackOperation {
240 
241 typedef struct MatroskaTrack {
242  uint64_t num;
243  uint64_t uid;
244  uint64_t type;
245  char *name;
246  char *codec_id;
248  char *language;
249  double time_scale;
251  uint64_t flag_default;
252  uint64_t flag_forced;
253  uint64_t flag_comment;
257  uint64_t seek_preroll;
262  uint64_t codec_delay;
264 
266  int64_t end_timecode;
270 
271  uint32_t palette[AVPALETTE_COUNT];
273 } MatroskaTrack;
274 
275 typedef struct MatroskaAttachment {
276  uint64_t uid;
277  char *filename;
278  char *description;
279  char *mime;
281 
284 
285 typedef struct MatroskaChapter {
286  uint64_t start;
287  uint64_t end;
288  uint64_t uid;
289  char *title;
290 
293 
294 typedef struct MatroskaIndexPos {
295  uint64_t track;
296  uint64_t pos;
298 
299 typedef struct MatroskaIndex {
300  uint64_t time;
302 } MatroskaIndex;
303 
304 typedef struct MatroskaTag {
305  char *name;
306  char *string;
307  char *lang;
308  uint64_t def;
310 } MatroskaTag;
311 
312 typedef struct MatroskaTagTarget {
313  char *type;
314  uint64_t typevalue;
315  uint64_t trackuid;
316  uint64_t chapteruid;
317  uint64_t attachuid;
319 
320 typedef struct MatroskaTags {
323 } MatroskaTags;
324 
325 typedef struct MatroskaSeekhead {
326  uint64_t id;
327  uint64_t pos;
329 
330 typedef struct MatroskaLevel {
331  uint64_t start;
332  uint64_t length;
333 } MatroskaLevel;
334 
335 typedef struct MatroskaBlock {
336  uint64_t duration;
338  uint64_t non_simple;
340  uint64_t additional_id;
343 } MatroskaBlock;
344 
345 typedef struct MatroskaCluster {
347  uint64_t timecode;
348  int64_t pos;
350 
351 typedef struct MatroskaLevel1Element {
352  int64_t pos;
353  uint32_t id;
354  int parsed;
356 
357 typedef struct MatroskaDemuxContext {
358  const AVClass *class;
360 
361  /* EBML stuff */
364  uint32_t current_id;
365  int64_t resync_pos;
367 
368  uint64_t time_scale;
369  double duration;
370  char *title;
371  char *muxingapp;
379 
380  /* byte position of the segment inside the stream */
381  int64_t segment_start;
382 
383  /* the packet queue */
386 
387  int done;
388 
389  /* What to skip before effectively reading a packet. */
392 
393  /* File has a CUES element, but we defer parsing until it is needed. */
395 
396  /* Level1 elements and whether they were read yet */
397  MatroskaLevel1Element level1_elems[64];
399 
401 
402  /* WebM DASH Manifest live flag */
403  int is_live;
404 
405  /* Bandwidth value for WebM DASH Manifest */
408 
409 #define CHILD_OF(parent) { .def = { .n = parent } }
410 
411 // The following forward declarations need their size because
412 // a tentative definition with internal linkage must not be an
413 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
414 // Removing the sizes breaks MSVC.
421 
423  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
424  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, 0, offsetof(Ebml, max_size), { .u = 8 } },
425  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, 0, offsetof(Ebml, id_length), { .u = 4 } },
426  { EBML_ID_DOCTYPE, EBML_STR, 0, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
427  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
429  { EBML_ID_DOCTYPEVERSION, EBML_NONE },
430  CHILD_OF(ebml_syntax)
431 };
432 
433 static EbmlSyntax ebml_syntax[] = {
434  { EBML_ID_HEADER, EBML_NEST, 0, 0, 0, { .n = ebml_header } },
436  { 0 }
437 };
438 
440  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
442  { MATROSKA_ID_TITLE, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, title) },
444  { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, muxingapp) },
445  { MATROSKA_ID_DATEUTC, EBML_BIN, 0, 0, offsetof(MatroskaDemuxContext, date_utc) },
446  { MATROSKA_ID_SEGMENTUID, EBML_NONE },
447  CHILD_OF(matroska_segment)
448 };
449 
457  { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_x) },
458  { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_y) },
459  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 1, 0, offsetof(MatroskaMasteringMeta, min_luminance) },
460  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, max_luminance) },
461  CHILD_OF(matroska_track_video_color)
462 };
463 
464 static EbmlSyntax matroska_track_video_color[] = {
465  { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
466  { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u = 0 } },
467  { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz) },
468  { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert) },
469  { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz) },
470  { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert) },
476  { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_cll) },
477  { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_fall) },
478  { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
479  CHILD_OF(matroska_track_video)
480 };
481 
485  { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f = 0.0 } },
486  { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f = 0.0 } },
487  { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f = 0.0 } },
488  CHILD_OF(matroska_track_video)
489 };
490 
491 static EbmlSyntax matroska_track_video[] = {
492  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideo, frame_rate) },
493  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
494  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
495  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_width) },
496  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_height) },
497  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideo, color_space) },
498  { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } },
499  { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, 0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
500  { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
502  { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
503  { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
504  { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
509  { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
510  CHILD_OF(matroska_track)
511 };
512 
514  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
515  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
516  { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, bitdepth) },
517  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
518  CHILD_OF(matroska_track)
519 };
520 
524  CHILD_OF(matroska_track_encoding)
525 };
526 
528  { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
531  { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
532  { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
533  { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
534  { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
535  CHILD_OF(matroska_track_encoding)
536 };
537 static EbmlSyntax matroska_track_encoding[] = {
538  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
539  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
540  { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
541  { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
543  CHILD_OF(matroska_track_encodings)
544 };
545 
546 static EbmlSyntax matroska_track_encodings[] = {
547  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, 0, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
548  CHILD_OF(matroska_track)
549 };
550 
554  CHILD_OF(matroska_track_combine_planes)
555 };
556 
557 static EbmlSyntax matroska_track_combine_planes[] = {
558  { MATROSKA_ID_TRACKPLANE, EBML_NEST, 0, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
559  CHILD_OF(matroska_track_operation)
560 };
561 
562 static EbmlSyntax matroska_track_operation[] = {
563  { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, 0, {.n = matroska_track_combine_planes} },
564  CHILD_OF(matroska_track)
565 };
566 
567 static EbmlSyntax matroska_track[] = {
568  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, 0, offsetof(MatroskaTrack, num) },
569  { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTrack, name) },
570  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, uid) },
571  { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrack, type) },
572  { MATROSKA_ID_CODECID, EBML_STR, 0, 0, offsetof(MatroskaTrack, codec_id) },
573  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrack, codec_priv) },
574  { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, codec_delay), { .u = 0 } },
575  { MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
576  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, 0, offsetof(MatroskaTrack, default_duration) },
577  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
578  { MATROSKA_ID_TRACKFLAGCOMMENTARY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_comment), { .u = 0 } },
579  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
580  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
581  { MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_hearingimpaired), { .u = 0 } },
582  { MATROSKA_ID_TRACKFLAGVISUALIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_visualimpaired), { .u = 0 } },
583  { MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_textdescriptions), { .u = 0 } },
584  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
585  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
586  { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
587  { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, 0, { .n = matroska_track_encodings } },
588  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, max_block_additional_id), { .u = 0 } },
589  { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, 0, offsetof(MatroskaTrack, seek_preroll), { .u = 0 } },
591  { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
592  { MATROSKA_ID_CODECNAME, EBML_NONE },
593  { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
594  { MATROSKA_ID_CODECINFOURL, EBML_NONE },
595  { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
596  { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
597  { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
598  CHILD_OF(matroska_tracks)
599 };
600 
601 static EbmlSyntax matroska_tracks[] = {
602  { MATROSKA_ID_TRACKENTRY, EBML_NEST, 0, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
603  CHILD_OF(matroska_segment)
604 };
605 
607  { MATROSKA_ID_FILEUID, EBML_UINT, 0, 0, offsetof(MatroskaAttachment, uid) },
608  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, filename) },
609  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, 0, offsetof(MatroskaAttachment, mime) },
610  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, 0, offsetof(MatroskaAttachment, bin) },
612  CHILD_OF(matroska_attachments)
613 };
614 
615 static EbmlSyntax matroska_attachments[] = {
616  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, 0, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
617  CHILD_OF(matroska_segment)
618 };
619 
621  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaChapter, title) },
623  { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
624  CHILD_OF(matroska_chapter_entry)
625 };
626 
627 static EbmlSyntax matroska_chapter_entry[] = {
628  { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
629  { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
630  { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaChapter, uid) },
631  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter_display } },
633  { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
634  { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
635  { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
636  CHILD_OF(matroska_chapter)
637 };
638 
639 static EbmlSyntax matroska_chapter[] = {
640  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, 0, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
642  { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
643  { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
644  { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
645  CHILD_OF(matroska_chapters)
646 };
647 
648 static EbmlSyntax matroska_chapters[] = {
649  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter } },
650  CHILD_OF(matroska_segment)
651 };
652 
654  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, track) },
657  { MATROSKA_ID_CUEDURATION, EBML_NONE },
658  { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
659  CHILD_OF(matroska_index_entry)
660 };
661 
662 static EbmlSyntax matroska_index_entry[] = {
663  { MATROSKA_ID_CUETIME, EBML_UINT, 0, 0, offsetof(MatroskaIndex, time) },
664  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, 0, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
665  CHILD_OF(matroska_index)
666 };
667 
668 static EbmlSyntax matroska_index[] = {
669  { MATROSKA_ID_POINTENTRY, EBML_NEST, 0, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
670  CHILD_OF(matroska_segment)
671 };
672 
674  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTag, name) },
675  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaTag, string) },
676  { MATROSKA_ID_TAGLANG, EBML_STR, 0, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
677  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
678  { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
679  { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
680  CHILD_OF(matroska_tag)
681 };
682 
685  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
686  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, trackuid), { .u = 0 } },
687  { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, chapteruid), { .u = 0 } },
688  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, attachuid), { .u = 0 } },
689  CHILD_OF(matroska_tag)
690 };
691 
692 static EbmlSyntax matroska_tag[] = {
693  { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
694  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
695  CHILD_OF(matroska_tags)
696 };
697 
698 static EbmlSyntax matroska_tags[] = {
699  { MATROSKA_ID_TAG, EBML_NEST, 0, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
700  CHILD_OF(matroska_segment)
701 };
702 
704  { MATROSKA_ID_SEEKID, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, id) },
705  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
706  CHILD_OF(matroska_seekhead)
707 };
708 
709 static EbmlSyntax matroska_seekhead[] = {
710  { MATROSKA_ID_SEEKENTRY, EBML_NEST, 0, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
711  CHILD_OF(matroska_segment)
712 };
713 
714 static EbmlSyntax matroska_segment[] = {
716  { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, 0, { .n = matroska_info } },
717  { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tracks } },
718  { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_attachments } },
719  { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_chapters } },
720  { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, 0, { .n = matroska_index } },
721  { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tags } },
722  { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, 0, { .n = matroska_seekhead } },
723  { 0 } /* We don't want to go back to level 0, so don't add the parent. */
724 };
725 
727  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, 0, { .n = matroska_segment } },
728  { 0 }
729 };
730 
732  { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
733  { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, 0, offsetof(MatroskaBlock,additional) },
734  CHILD_OF(matroska_blockadditions)
735 };
736 
737 static EbmlSyntax matroska_blockadditions[] = {
738  { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, 0, {.n = matroska_blockmore} },
739  CHILD_OF(matroska_blockgroup)
740 };
741 
742 static EbmlSyntax matroska_blockgroup[] = {
743  { MATROSKA_ID_BLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
744  { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, 0, { .n = matroska_blockadditions} },
746  { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, 0, offsetof(MatroskaBlock, discard_padding) },
747  { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 1, 0, offsetof(MatroskaBlock, reference) },
749  { 1, EBML_UINT, 0, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
750  CHILD_OF(matroska_cluster_parsing)
751 };
752 
753 // The following array contains SimpleBlock and BlockGroup twice
754 // in order to reuse the other values for matroska_cluster_enter.
755 static EbmlSyntax matroska_cluster_parsing[] = {
756  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
757  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, 0, { .n = matroska_blockgroup } },
758  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, 0, offsetof(MatroskaCluster, timecode) },
760  { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
762  { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
763  CHILD_OF(matroska_segment)
764 };
765 
767  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, 0, { .n = &matroska_cluster_parsing[2] } },
768  { 0 }
769 };
770 #undef CHILD_OF
771 
772 static const CodecMime mkv_image_mime_tags[] = {
773  {"image/gif" , AV_CODEC_ID_GIF},
774  {"image/jpeg" , AV_CODEC_ID_MJPEG},
775  {"image/png" , AV_CODEC_ID_PNG},
776  {"image/tiff" , AV_CODEC_ID_TIFF},
777 
778  {"" , AV_CODEC_ID_NONE}
779 };
780 
781 static const CodecMime mkv_mime_tags[] = {
782  {"text/plain" , AV_CODEC_ID_TEXT},
783  {"application/x-truetype-font", AV_CODEC_ID_TTF},
784  {"application/x-font" , AV_CODEC_ID_TTF},
785  {"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
786  {"binary" , AV_CODEC_ID_BIN_DATA},
787 
788  {"" , AV_CODEC_ID_NONE}
789 };
790 
791 static const char *const matroska_doctypes[] = { "matroska", "webm" };
792 
794 
795 /*
796  * This function prepares the status for parsing of level 1 elements.
797  */
799  uint32_t id, int64_t position)
800 {
801  if (position >= 0) {
802  int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
803  if (err < 0)
804  return err;
805  }
806 
807  matroska->current_id = id;
808  matroska->num_levels = 1;
809  matroska->unknown_count = 0;
810  matroska->resync_pos = avio_tell(matroska->ctx->pb);
811  if (id)
812  matroska->resync_pos -= (av_log2(id) + 7) / 8;
813 
814  return 0;
815 }
816 
817 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
818 {
819  AVIOContext *pb = matroska->ctx->pb;
820  uint32_t id;
821 
822  /* Try to seek to the last position to resync from. If this doesn't work,
823  * we resync from the earliest position available: The start of the buffer. */
824  if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
825  av_log(matroska->ctx, AV_LOG_WARNING,
826  "Seek to desired resync point failed. Seeking to "
827  "earliest point available instead.\n");
828  avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
829  last_pos + 1), SEEK_SET);
830  }
831 
832  id = avio_rb32(pb);
833 
834  // try to find a toplevel element
835  while (!avio_feof(pb)) {
836  if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
837  id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
839  id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
840  /* Prepare the context for parsing of a level 1 element. */
841  matroska_reset_status(matroska, id, -1);
842  /* Given that we are here means that an error has occurred,
843  * so treat the segment as unknown length in order not to
844  * discard valid data that happens to be beyond the designated
845  * end of the segment. */
846  matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
847  return 0;
848  }
849  id = (id << 8) | avio_r8(pb);
850  }
851 
852  matroska->done = 1;
853  return pb->error ? pb->error : AVERROR_EOF;
854 }
855 
856 /*
857  * Read: an "EBML number", which is defined as a variable-length
858  * array of bytes. The first byte indicates the length by giving a
859  * number of 0-bits followed by a one. The position of the first
860  * "one" bit inside the first byte indicates the length of this
861  * number.
862  * Returns: number of bytes read, < 0 on error
863  */
865  int max_size, uint64_t *number, int eof_forbidden)
866 {
867  int read, n = 1;
868  uint64_t total;
869  int64_t pos;
870 
871  /* The first byte tells us the length in bytes - except when it is zero. */
872  total = avio_r8(pb);
873  if (pb->eof_reached)
874  goto err;
875 
876  /* get the length of the EBML number */
877  read = 8 - ff_log2_tab[total];
878 
879  if (!total || read > max_size) {
880  pos = avio_tell(pb) - 1;
881  if (!total) {
882  av_log(matroska->ctx, AV_LOG_ERROR,
883  "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
884  "of an EBML number\n", pos, pos);
885  } else {
886  av_log(matroska->ctx, AV_LOG_ERROR,
887  "Length %d indicated by an EBML number's first byte 0x%02x "
888  "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
889  read, (uint8_t) total, pos, pos, max_size);
890  }
891  return AVERROR_INVALIDDATA;
892  }
893 
894  /* read out length */
895  total ^= 1 << ff_log2_tab[total];
896  while (n++ < read)
897  total = (total << 8) | avio_r8(pb);
898 
899  if (pb->eof_reached) {
900  eof_forbidden = 1;
901  goto err;
902  }
903 
904  *number = total;
905 
906  return read;
907 
908 err:
909  pos = avio_tell(pb);
910  if (pb->error) {
911  av_log(matroska->ctx, AV_LOG_ERROR,
912  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
913  pos, pos);
914  return pb->error;
915  }
916  if (eof_forbidden) {
917  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
918  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
919  return AVERROR(EIO);
920  }
921  return AVERROR_EOF;
922 }
923 
924 /**
925  * Read a EBML length value.
926  * This needs special handling for the "unknown length" case which has multiple
927  * encodings.
928  */
930  uint64_t *number)
931 {
932  int res = ebml_read_num(matroska, pb, 8, number, 1);
933  if (res > 0 && *number + 1 == 1ULL << (7 * res))
934  *number = EBML_UNKNOWN_LENGTH;
935  return res;
936 }
937 
938 /*
939  * Read the next element as an unsigned int.
940  * Returns NEEDS_CHECKING unless size == 0.
941  */
942 static int ebml_read_uint(AVIOContext *pb, int size,
943  uint64_t default_value, uint64_t *num)
944 {
945  int n = 0;
946 
947  if (size == 0) {
948  *num = default_value;
949  return 0;
950  }
951  /* big-endian ordering; build up number */
952  *num = 0;
953  while (n++ < size)
954  *num = (*num << 8) | avio_r8(pb);
955 
956  return NEEDS_CHECKING;
957 }
958 
959 /*
960  * Read the next element as a signed int.
961  * Returns NEEDS_CHECKING unless size == 0.
962  */
963 static int ebml_read_sint(AVIOContext *pb, int size,
964  int64_t default_value, int64_t *num)
965 {
966  int n = 1;
967 
968  if (size == 0) {
969  *num = default_value;
970  return 0;
971  } else {
972  *num = sign_extend(avio_r8(pb), 8);
973 
974  /* big-endian ordering; build up number */
975  while (n++ < size)
976  *num = ((uint64_t)*num << 8) | avio_r8(pb);
977  }
978 
979  return NEEDS_CHECKING;
980 }
981 
982 /*
983  * Read the next element as a float.
984  * Returns 0 if size == 0, NEEDS_CHECKING or < 0 on obvious failure.
985  */
986 static int ebml_read_float(AVIOContext *pb, int size,
987  double default_value, double *num)
988 {
989  if (size == 0) {
990  *num = default_value;
991  return 0;
992  } else if (size == 4) {
993  *num = av_int2float(avio_rb32(pb));
994  } else if (size == 8) {
995  *num = av_int2double(avio_rb64(pb));
996  } else
997  return AVERROR_INVALIDDATA;
998 
999  return NEEDS_CHECKING;
1000 }
1001 
1002 /*
1003  * Read the next element as an ASCII string.
1004  * 0 is success, < 0 or NEEDS_CHECKING is failure.
1005  */
1006 static int ebml_read_ascii(AVIOContext *pb, int size,
1007  const char *default_value, char **str)
1008 {
1009  char *res;
1010  int ret;
1011 
1012  if (size == 0 && default_value) {
1013  res = av_strdup(default_value);
1014  if (!res)
1015  return AVERROR(ENOMEM);
1016  } else {
1017  /* EBML strings are usually not 0-terminated, so we allocate one
1018  * byte more, read the string and NUL-terminate it ourselves. */
1019  if (!(res = av_malloc(size + 1)))
1020  return AVERROR(ENOMEM);
1021  if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
1022  av_free(res);
1023  return ret < 0 ? ret : NEEDS_CHECKING;
1024  }
1025  (res)[size] = '\0';
1026  }
1027  av_free(*str);
1028  *str = res;
1029 
1030  return 0;
1031 }
1032 
1033 /*
1034  * Read the next element as binary data.
1035  * 0 is success, < 0 or NEEDS_CHECKING is failure.
1036  */
1038  int64_t pos, EbmlBin *bin)
1039 {
1040  int ret;
1041 
1042  ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
1043  if (ret < 0)
1044  return ret;
1045  memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1046 
1047  bin->data = bin->buf->data;
1048  bin->size = length;
1049  bin->pos = pos;
1050  if ((ret = avio_read(pb, bin->data, length)) != length) {
1051  av_buffer_unref(&bin->buf);
1052  bin->data = NULL;
1053  bin->size = 0;
1054  return ret < 0 ? ret : NEEDS_CHECKING;
1055  }
1056 
1057  return 0;
1058 }
1059 
1060 /*
1061  * Read the next element, but only the header. The contents
1062  * are supposed to be sub-elements which can be read separately.
1063  * 0 is success, < 0 is failure.
1064  */
1066  uint64_t length, int64_t pos)
1067 {
1069 
1070  if (matroska->num_levels >= EBML_MAX_DEPTH) {
1071  av_log(matroska->ctx, AV_LOG_ERROR,
1072  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1073  return AVERROR(ENOSYS);
1074  }
1075 
1076  level = &matroska->levels[matroska->num_levels++];
1077  level->start = pos;
1078  level->length = length;
1079 
1080  return 0;
1081 }
1082 
1083 /*
1084  * Read a signed "EBML number"
1085  * Return: number of bytes processed, < 0 on error
1086  */
1088  AVIOContext *pb, int64_t *num)
1089 {
1090  uint64_t unum;
1091  int res;
1092 
1093  /* read as unsigned number first */
1094  if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1095  return res;
1096 
1097  /* make signed (weird way) */
1098  *num = unum - ((1LL << (7 * res - 1)) - 1);
1099 
1100  return res;
1101 }
1102 
1103 static int ebml_parse(MatroskaDemuxContext *matroska,
1104  EbmlSyntax *syntax, void *data);
1105 
1106 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1107 {
1108  int i;
1109 
1110  // Whoever touches this should be aware of the duplication
1111  // existing in matroska_cluster_parsing.
1112  for (i = 0; syntax[i].id; i++)
1113  if (id == syntax[i].id)
1114  break;
1115 
1116  return &syntax[i];
1117 }
1118 
1119 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1120  void *data)
1121 {
1122  int res;
1123 
1124  if (data) {
1125  for (int i = 0; syntax[i].id; i++) {
1126  void *dst = (char *)data + syntax[i].data_offset;
1127  switch (syntax[i].type) {
1128  case EBML_UINT:
1129  *(uint64_t *)dst = syntax[i].def.u;
1130  break;
1131  case EBML_SINT:
1132  *(int64_t *) dst = syntax[i].def.i;
1133  break;
1134  case EBML_FLOAT:
1135  *(double *) dst = syntax[i].def.f;
1136  break;
1137  case EBML_STR:
1138  case EBML_UTF8:
1139  // the default may be NULL
1140  if (syntax[i].def.s) {
1141  *(char**)dst = av_strdup(syntax[i].def.s);
1142  if (!*(char**)dst)
1143  return AVERROR(ENOMEM);
1144  }
1145  break;
1146  }
1147  }
1148 
1149  if (!matroska->levels[matroska->num_levels - 1].length) {
1150  matroska->num_levels--;
1151  return 0;
1152  }
1153  }
1154 
1155  do {
1156  res = ebml_parse(matroska, syntax, data);
1157  } while (!res);
1158 
1159  return res == LEVEL_ENDED ? 0 : res;
1160 }
1161 
1162 static int is_ebml_id_valid(uint32_t id)
1163 {
1164  // Due to endian nonsense in Matroska, the highest byte with any bits set
1165  // will contain the leading length bit. This bit in turn identifies the
1166  // total byte length of the element by its position within the byte.
1167  unsigned int bits = av_log2(id);
1168  return id && (bits + 7) / 8 == (8 - bits % 8);
1169 }
1170 
1171 /*
1172  * Allocate and return the entry for the level1 element with the given ID. If
1173  * an entry already exists, return the existing entry.
1174  */
1176  uint32_t id, int64_t pos)
1177 {
1178  int i;
1179  MatroskaLevel1Element *elem;
1180 
1181  if (!is_ebml_id_valid(id))
1182  return NULL;
1183 
1184  // Some files link to all clusters; useless.
1185  if (id == MATROSKA_ID_CLUSTER)
1186  return NULL;
1187 
1188  // There can be multiple SeekHeads and Tags.
1189  for (i = 0; i < matroska->num_level1_elems; i++) {
1190  if (matroska->level1_elems[i].id == id) {
1191  if (matroska->level1_elems[i].pos == pos ||
1192  id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
1193  return &matroska->level1_elems[i];
1194  }
1195  }
1196 
1197  // Only a completely broken file would have more elements.
1198  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1199  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
1200  return NULL;
1201  }
1202 
1203  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1204  *elem = (MatroskaLevel1Element){.id = id};
1205 
1206  return elem;
1207 }
1208 
1209 static int ebml_parse(MatroskaDemuxContext *matroska,
1210  EbmlSyntax *syntax, void *data)
1211 {
1212  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1213  // Forbid unknown-length EBML_NONE elements.
1215  [EBML_UINT] = 8,
1216  [EBML_SINT] = 8,
1217  [EBML_FLOAT] = 8,
1218  // max. 16 MB for strings
1219  [EBML_STR] = 0x1000000,
1220  [EBML_UTF8] = 0x1000000,
1221  // max. 256 MB for binary data
1222  [EBML_BIN] = 0x10000000,
1223  // no limits for anything else
1224  };
1225  AVIOContext *pb = matroska->ctx->pb;
1226  uint32_t id;
1227  uint64_t length;
1228  int64_t pos = avio_tell(pb), pos_alt;
1229  int res, update_pos = 1, level_check;
1230  MatroskaLevel1Element *level1_elem;
1231  MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1232 
1233  if (!matroska->current_id) {
1234  uint64_t id;
1235  res = ebml_read_num(matroska, pb, 4, &id, 0);
1236  if (res < 0) {
1237  if (pb->eof_reached && res == AVERROR_EOF) {
1238  if (matroska->is_live)
1239  // in live mode, finish parsing if EOF is reached.
1240  return 1;
1241  if (level && pos == avio_tell(pb)) {
1242  if (level->length == EBML_UNKNOWN_LENGTH) {
1243  // Unknown-length levels automatically end at EOF.
1244  matroska->num_levels--;
1245  return LEVEL_ENDED;
1246  } else {
1247  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1248  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1249  }
1250  }
1251  }
1252  return res;
1253  }
1254  matroska->current_id = id | 1 << 7 * res;
1255  pos_alt = pos + res;
1256  } else {
1257  pos_alt = pos;
1258  pos -= (av_log2(matroska->current_id) + 7) / 8;
1259  }
1260 
1261  id = matroska->current_id;
1262 
1263  syntax = ebml_parse_id(syntax, id);
1264  if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1265  if (level && level->length == EBML_UNKNOWN_LENGTH) {
1266  // Unknown-length levels end when an element from an upper level
1267  // in the hierarchy is encountered.
1268  while (syntax->def.n) {
1269  syntax = ebml_parse_id(syntax->def.n, id);
1270  if (syntax->id) {
1271  matroska->num_levels--;
1272  return LEVEL_ENDED;
1273  }
1274  };
1275  }
1276 
1277  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1278  "%"PRId64"\n", id, pos);
1279  update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1280  }
1281 
1282  if (data) {
1283  data = (char *) data + syntax->data_offset;
1284  if (syntax->list_elem_size) {
1285  EbmlList *list = data;
1286  void *newelem;
1287 
1288  if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1289  return AVERROR(ENOMEM);
1290  newelem = av_fast_realloc(list->elem,
1291  &list->alloc_elem_size,
1292  (list->nb_elem + 1) * syntax->list_elem_size);
1293  if (!newelem)
1294  return AVERROR(ENOMEM);
1295  list->elem = newelem;
1296  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1297  memset(data, 0, syntax->list_elem_size);
1298  list->nb_elem++;
1299  }
1300  }
1301 
1302  if (syntax->type != EBML_STOP) {
1303  matroska->current_id = 0;
1304  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1305  return res;
1306 
1307  pos_alt += res;
1308 
1309  if (matroska->num_levels > 0) {
1310  if (length != EBML_UNKNOWN_LENGTH &&
1311  level->length != EBML_UNKNOWN_LENGTH) {
1312  uint64_t elem_end = pos_alt + length,
1313  level_end = level->start + level->length;
1314 
1315  if (elem_end < level_end) {
1316  level_check = 0;
1317  } else if (elem_end == level_end) {
1318  level_check = LEVEL_ENDED;
1319  } else {
1320  av_log(matroska->ctx, AV_LOG_ERROR,
1321  "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1322  "containing master element ending at 0x%"PRIx64"\n",
1323  pos, elem_end, level_end);
1324  return AVERROR_INVALIDDATA;
1325  }
1326  } else if (length != EBML_UNKNOWN_LENGTH) {
1327  level_check = 0;
1328  } else if (level->length != EBML_UNKNOWN_LENGTH) {
1329  av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1330  "at 0x%"PRIx64" inside parent with finite size\n", pos);
1331  return AVERROR_INVALIDDATA;
1332  } else {
1333  level_check = 0;
1334  if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1335  || syntax->type == EBML_NEST)) {
1336  // According to the current specifications only clusters and
1337  // segments are allowed to be unknown-length. We also accept
1338  // other unknown-length master elements.
1339  av_log(matroska->ctx, AV_LOG_WARNING,
1340  "Found unknown-length element 0x%"PRIX32" other than "
1341  "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1342  "parsing will nevertheless be attempted.\n", id, pos);
1343  update_pos = -1;
1344  }
1345  }
1346  } else
1347  level_check = 0;
1348 
1349  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1350  if (length != EBML_UNKNOWN_LENGTH) {
1351  av_log(matroska->ctx, AV_LOG_ERROR,
1352  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1353  "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1354  length, max_lengths[syntax->type], id, pos);
1355  } else if (syntax->type != EBML_NONE) {
1356  av_log(matroska->ctx, AV_LOG_ERROR,
1357  "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1358  "unknown length, yet the length of an element of its "
1359  "type must be known.\n", id, pos);
1360  } else {
1361  av_log(matroska->ctx, AV_LOG_ERROR,
1362  "Found unknown-length element with ID 0x%"PRIX32" at "
1363  "pos. 0x%"PRIx64" for which no syntax for parsing is "
1364  "available.\n", id, pos);
1365  }
1366  return AVERROR_INVALIDDATA;
1367  }
1368 
1369  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1370  // Loosing sync will likely manifest itself as encountering unknown
1371  // elements which are not reliably distinguishable from elements
1372  // belonging to future extensions of the format.
1373  // We use a heuristic to detect such situations: If the current
1374  // element is not expected at the current syntax level and there
1375  // were only a few unknown elements in a row, then the element is
1376  // skipped or considered defective based upon the length of the
1377  // current element (i.e. how much would be skipped); if there were
1378  // more than a few skipped elements in a row and skipping the current
1379  // element would lead us more than SKIP_THRESHOLD away from the last
1380  // known good position, then it is inferred that an error occurred.
1381  // The dependency on the number of unknown elements in a row exists
1382  // because the distance to the last known good position is
1383  // automatically big if the last parsed element was big.
1384  // In both cases, each unknown element is considered equivalent to
1385  // UNKNOWN_EQUIV of skipped bytes for the check.
1386  // The whole check is only done for non-seekable output, because
1387  // in this situation skipped data can't simply be rechecked later.
1388  // This is especially important when using unkown length elements
1389  // as the check for whether a child exceeds its containing master
1390  // element is not effective in this situation.
1391  if (update_pos) {
1392  matroska->unknown_count = 0;
1393  } else {
1394  int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1395 
1396  if (matroska->unknown_count > 3)
1397  dist += pos_alt - matroska->resync_pos;
1398 
1399  if (dist > SKIP_THRESHOLD) {
1400  av_log(matroska->ctx, AV_LOG_ERROR,
1401  "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1402  "length 0x%"PRIx64" considered as invalid data. Last "
1403  "known good position 0x%"PRIx64", %d unknown elements"
1404  " in a row\n", id, pos, length, matroska->resync_pos,
1405  matroska->unknown_count);
1406  return AVERROR_INVALIDDATA;
1407  }
1408  }
1409  }
1410 
1411  if (update_pos > 0) {
1412  // We have found an element that is allowed at this place
1413  // in the hierarchy and it passed all checks, so treat the beginning
1414  // of the element as the "last known good" position.
1415  matroska->resync_pos = pos;
1416  }
1417 
1418  if (!data && length != EBML_UNKNOWN_LENGTH)
1419  goto skip;
1420  }
1421 
1422  switch (syntax->type) {
1423  case EBML_UINT:
1424  res = ebml_read_uint(pb, length, syntax->def.u, data);
1425  break;
1426  case EBML_SINT:
1427  res = ebml_read_sint(pb, length, syntax->def.i, data);
1428  break;
1429  case EBML_FLOAT:
1430  res = ebml_read_float(pb, length, syntax->def.f, data);
1431  break;
1432  case EBML_STR:
1433  case EBML_UTF8:
1434  res = ebml_read_ascii(pb, length, syntax->def.s, data);
1435  break;
1436  case EBML_BIN:
1437  res = ebml_read_binary(pb, length, pos_alt, data);
1438  break;
1439  case EBML_LEVEL1:
1440  case EBML_NEST:
1441  if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1442  return res;
1443  if (id == MATROSKA_ID_SEGMENT)
1444  matroska->segment_start = pos_alt;
1445  if (id == MATROSKA_ID_CUES)
1446  matroska->cues_parsing_deferred = 0;
1447  if (syntax->type == EBML_LEVEL1 &&
1448  (level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
1449  if (!level1_elem->pos) {
1450  // Zero is not a valid position for a level 1 element.
1451  level1_elem->pos = pos;
1452  } else if (level1_elem->pos != pos)
1453  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1454  level1_elem->parsed = 1;
1455  }
1456  if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1457  return res;
1458  break;
1459  case EBML_STOP:
1460  return 1;
1461  skip:
1462  default:
1463  if (length) {
1464  int64_t res2;
1465  if (ffio_limit(pb, length) != length) {
1466  // ffio_limit emits its own error message,
1467  // so we don't have to.
1468  return AVERROR(EIO);
1469  }
1470  if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1471  // avio_skip might take us past EOF. We check for this
1472  // by skipping only length - 1 bytes, reading a byte and
1473  // checking the error flags. This is done in order to check
1474  // that the element has been properly skipped even when
1475  // no filesize (that ffio_limit relies on) is available.
1476  avio_r8(pb);
1477  res = NEEDS_CHECKING;
1478  } else
1479  res = res2;
1480  } else
1481  res = 0;
1482  }
1483  if (res) {
1484  if (res == NEEDS_CHECKING) {
1485  if (pb->eof_reached) {
1486  if (pb->error)
1487  res = pb->error;
1488  else
1489  res = AVERROR_EOF;
1490  } else
1491  goto level_check;
1492  }
1493 
1494  if (res == AVERROR_INVALIDDATA)
1495  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1496  else if (res == AVERROR(EIO))
1497  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1498  else if (res == AVERROR_EOF) {
1499  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1500  res = AVERROR(EIO);
1501  }
1502 
1503  return res;
1504  }
1505 
1506 level_check:
1507  if (syntax->is_counted && data) {
1508  CountedElement *elem = data;
1509  if (elem->count != UINT_MAX)
1510  elem->count++;
1511  }
1512 
1513  if (level_check == LEVEL_ENDED && matroska->num_levels) {
1514  level = &matroska->levels[matroska->num_levels - 1];
1515  pos = avio_tell(pb);
1516 
1517  // Given that pos >= level->start no check for
1518  // level->length != EBML_UNKNOWN_LENGTH is necessary.
1519  while (matroska->num_levels && pos == level->start + level->length) {
1520  matroska->num_levels--;
1521  level--;
1522  }
1523  }
1524 
1525  return level_check;
1526 }
1527 
1528 static void ebml_free(EbmlSyntax *syntax, void *data)
1529 {
1530  int i, j;
1531  for (i = 0; syntax[i].id; i++) {
1532  void *data_off = (char *) data + syntax[i].data_offset;
1533  switch (syntax[i].type) {
1534  case EBML_STR:
1535  case EBML_UTF8:
1536  av_freep(data_off);
1537  break;
1538  case EBML_BIN:
1539  av_buffer_unref(&((EbmlBin *) data_off)->buf);
1540  break;
1541  case EBML_LEVEL1:
1542  case EBML_NEST:
1543  if (syntax[i].list_elem_size) {
1544  EbmlList *list = data_off;
1545  char *ptr = list->elem;
1546  for (j = 0; j < list->nb_elem;
1547  j++, ptr += syntax[i].list_elem_size)
1548  ebml_free(syntax[i].def.n, ptr);
1549  av_freep(&list->elem);
1550  list->nb_elem = 0;
1551  list->alloc_elem_size = 0;
1552  } else
1553  ebml_free(syntax[i].def.n, data_off);
1554  default:
1555  break;
1556  }
1557  }
1558 }
1559 
1560 /*
1561  * Autodetecting...
1562  */
1563 static int matroska_probe(const AVProbeData *p)
1564 {
1565  uint64_t total = 0;
1566  int len_mask = 0x80, size = 1, n = 1, i;
1567 
1568  /* EBML header? */
1569  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1570  return 0;
1571 
1572  /* length of header */
1573  total = p->buf[4];
1574  while (size <= 8 && !(total & len_mask)) {
1575  size++;
1576  len_mask >>= 1;
1577  }
1578  if (size > 8)
1579  return 0;
1580  total &= (len_mask - 1);
1581  while (n < size)
1582  total = (total << 8) | p->buf[4 + n++];
1583 
1584  if (total + 1 == 1ULL << (7 * size)){
1585  /* Unknown-length header - simply parse the whole buffer. */
1586  total = p->buf_size - 4 - size;
1587  } else {
1588  /* Does the probe data contain the whole header? */
1589  if (p->buf_size < 4 + size + total)
1590  return 0;
1591  }
1592 
1593  /* The header should contain a known document type. For now,
1594  * we don't parse the whole header but simply check for the
1595  * availability of that array of characters inside the header.
1596  * Not fully fool-proof, but good enough. */
1597  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1598  size_t probelen = strlen(matroska_doctypes[i]);
1599  if (total < probelen)
1600  continue;
1601  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1602  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1603  return AVPROBE_SCORE_MAX;
1604  }
1605 
1606  // probably valid EBML header but no recognized doctype
1607  return AVPROBE_SCORE_EXTENSION;
1608 }
1609 
1611  uint64_t num)
1612 {
1613  MatroskaTrack *tracks = matroska->tracks.elem;
1614  int i;
1615 
1616  for (i = 0; i < matroska->tracks.nb_elem; i++)
1617  if (tracks[i].num == num)
1618  return &tracks[i];
1619 
1620  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %"PRIu64"\n", num);
1621  return NULL;
1622 }
1623 
1624 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1625  MatroskaTrack *track)
1626 {
1627  MatroskaTrackEncoding *encodings = track->encodings.elem;
1628  uint8_t *data = *buf;
1629  int isize = *buf_size;
1630  uint8_t *pkt_data = NULL;
1631  uint8_t av_unused *newpktdata;
1632  int pkt_size = isize;
1633  int result = 0;
1634  int olen;
1635 
1636  if (pkt_size >= 10000000U)
1637  return AVERROR_INVALIDDATA;
1638 
1639  switch (encodings[0].compression.algo) {
1641  {
1642  int header_size = encodings[0].compression.settings.size;
1643  uint8_t *header = encodings[0].compression.settings.data;
1644 
1645  if (header_size && !header) {
1646  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1647  return -1;
1648  }
1649 
1650  if (!header_size)
1651  return 0;
1652 
1653  pkt_size = isize + header_size;
1654  pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1655  if (!pkt_data)
1656  return AVERROR(ENOMEM);
1657 
1658  memcpy(pkt_data, header, header_size);
1659  memcpy(pkt_data + header_size, data, isize);
1660  break;
1661  }
1662 #if CONFIG_LZO
1664  do {
1665  int insize = isize;
1666  olen = pkt_size *= 3;
1667  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1669  if (!newpktdata) {
1670  result = AVERROR(ENOMEM);
1671  goto failed;
1672  }
1673  pkt_data = newpktdata;
1674  result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1675  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1676  if (result) {
1677  result = AVERROR_INVALIDDATA;
1678  goto failed;
1679  }
1680  pkt_size -= olen;
1681  break;
1682 #endif
1683 #if CONFIG_ZLIB
1685  {
1686  z_stream zstream = { 0 };
1687  if (inflateInit(&zstream) != Z_OK)
1688  return -1;
1689  zstream.next_in = data;
1690  zstream.avail_in = isize;
1691  do {
1692  pkt_size *= 3;
1693  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1694  if (!newpktdata) {
1695  inflateEnd(&zstream);
1696  result = AVERROR(ENOMEM);
1697  goto failed;
1698  }
1699  pkt_data = newpktdata;
1700  zstream.avail_out = pkt_size - zstream.total_out;
1701  zstream.next_out = pkt_data + zstream.total_out;
1702  result = inflate(&zstream, Z_NO_FLUSH);
1703  } while (result == Z_OK && pkt_size < 10000000);
1704  pkt_size = zstream.total_out;
1705  inflateEnd(&zstream);
1706  if (result != Z_STREAM_END) {
1707  if (result == Z_MEM_ERROR)
1708  result = AVERROR(ENOMEM);
1709  else
1710  result = AVERROR_INVALIDDATA;
1711  goto failed;
1712  }
1713  break;
1714  }
1715 #endif
1716 #if CONFIG_BZLIB
1718  {
1719  bz_stream bzstream = { 0 };
1720  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1721  return -1;
1722  bzstream.next_in = data;
1723  bzstream.avail_in = isize;
1724  do {
1725  pkt_size *= 3;
1726  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1727  if (!newpktdata) {
1728  BZ2_bzDecompressEnd(&bzstream);
1729  result = AVERROR(ENOMEM);
1730  goto failed;
1731  }
1732  pkt_data = newpktdata;
1733  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1734  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1735  result = BZ2_bzDecompress(&bzstream);
1736  } while (result == BZ_OK && pkt_size < 10000000);
1737  pkt_size = bzstream.total_out_lo32;
1738  BZ2_bzDecompressEnd(&bzstream);
1739  if (result != BZ_STREAM_END) {
1740  if (result == BZ_MEM_ERROR)
1741  result = AVERROR(ENOMEM);
1742  else
1743  result = AVERROR_INVALIDDATA;
1744  goto failed;
1745  }
1746  break;
1747  }
1748 #endif
1749  default:
1750  return AVERROR_INVALIDDATA;
1751  }
1752 
1753  memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1754 
1755  *buf = pkt_data;
1756  *buf_size = pkt_size;
1757  return 0;
1758 
1759 failed:
1760  av_free(pkt_data);
1761  return result;
1762 }
1763 
1765  AVDictionary **metadata, char *prefix)
1766 {
1767  MatroskaTag *tags = list->elem;
1768  char key[1024];
1769  int i;
1770 
1771  for (i = 0; i < list->nb_elem; i++) {
1772  const char *lang = tags[i].lang &&
1773  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1774 
1775  if (!tags[i].name) {
1776  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1777  continue;
1778  }
1779  if (prefix)
1780  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1781  else
1782  av_strlcpy(key, tags[i].name, sizeof(key));
1783  if (tags[i].def || !lang) {
1784  av_dict_set(metadata, key, tags[i].string, 0);
1785  if (tags[i].sub.nb_elem)
1786  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1787  }
1788  if (lang) {
1789  av_strlcat(key, "-", sizeof(key));
1790  av_strlcat(key, lang, sizeof(key));
1791  av_dict_set(metadata, key, tags[i].string, 0);
1792  if (tags[i].sub.nb_elem)
1793  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1794  }
1795  }
1797 }
1798 
1800 {
1801  MatroskaDemuxContext *matroska = s->priv_data;
1802  MatroskaTags *tags = matroska->tags.elem;
1803  int i, j;
1804 
1805  for (i = 0; i < matroska->tags.nb_elem; i++) {
1806  if (tags[i].target.attachuid) {
1807  MatroskaAttachment *attachment = matroska->attachments.elem;
1808  int found = 0;
1809  for (j = 0; j < matroska->attachments.nb_elem; j++) {
1810  if (attachment[j].uid == tags[i].target.attachuid &&
1811  attachment[j].stream) {
1812  matroska_convert_tag(s, &tags[i].tag,
1813  &attachment[j].stream->metadata, NULL);
1814  found = 1;
1815  }
1816  }
1817  if (!found) {
1819  "The tags at index %d refer to a "
1820  "non-existent attachment %"PRId64".\n",
1821  i, tags[i].target.attachuid);
1822  }
1823  } else if (tags[i].target.chapteruid) {
1824  MatroskaChapter *chapter = matroska->chapters.elem;
1825  int found = 0;
1826  for (j = 0; j < matroska->chapters.nb_elem; j++) {
1827  if (chapter[j].uid == tags[i].target.chapteruid &&
1828  chapter[j].chapter) {
1829  matroska_convert_tag(s, &tags[i].tag,
1830  &chapter[j].chapter->metadata, NULL);
1831  found = 1;
1832  }
1833  }
1834  if (!found) {
1836  "The tags at index %d refer to a non-existent chapter "
1837  "%"PRId64".\n",
1838  i, tags[i].target.chapteruid);
1839  }
1840  } else if (tags[i].target.trackuid) {
1841  MatroskaTrack *track = matroska->tracks.elem;
1842  int found = 0;
1843  for (j = 0; j < matroska->tracks.nb_elem; j++) {
1844  if (track[j].uid == tags[i].target.trackuid &&
1845  track[j].stream) {
1846  matroska_convert_tag(s, &tags[i].tag,
1847  &track[j].stream->metadata, NULL);
1848  found = 1;
1849  }
1850  }
1851  if (!found) {
1853  "The tags at index %d refer to a non-existent track "
1854  "%"PRId64".\n",
1855  i, tags[i].target.trackuid);
1856  }
1857  } else {
1858  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1859  tags[i].target.type);
1860  }
1861  }
1862 }
1863 
1865  int64_t pos)
1866 {
1867  uint32_t saved_id = matroska->current_id;
1868  int64_t before_pos = avio_tell(matroska->ctx->pb);
1869  int ret = 0;
1870 
1871  /* seek */
1872  if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1873  /* We don't want to lose our seekhead level, so we add
1874  * a dummy. This is a crude hack. */
1875  if (matroska->num_levels == EBML_MAX_DEPTH) {
1876  av_log(matroska->ctx, AV_LOG_INFO,
1877  "Max EBML element depth (%d) reached, "
1878  "cannot parse further.\n", EBML_MAX_DEPTH);
1879  ret = AVERROR_INVALIDDATA;
1880  } else {
1881  matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1882  matroska->num_levels++;
1883  matroska->current_id = 0;
1884 
1885  ret = ebml_parse(matroska, matroska_segment, matroska);
1886  if (ret == LEVEL_ENDED) {
1887  /* This can only happen if the seek brought us beyond EOF. */
1888  ret = AVERROR_EOF;
1889  }
1890  }
1891  }
1892  /* Seek back - notice that in all instances where this is used
1893  * it is safe to set the level to 1. */
1894  matroska_reset_status(matroska, saved_id, before_pos);
1895 
1896  return ret;
1897 }
1898 
1900 {
1901  EbmlList *seekhead_list = &matroska->seekhead;
1902  int i;
1903 
1904  // we should not do any seeking in the streaming case
1905  if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1906  return;
1907 
1908  for (i = 0; i < seekhead_list->nb_elem; i++) {
1909  MatroskaSeekhead *seekheads = seekhead_list->elem;
1910  uint32_t id = seekheads[i].id;
1911  int64_t pos = seekheads[i].pos + matroska->segment_start;
1912  MatroskaLevel1Element *elem;
1913 
1914  if (id != seekheads[i].id || pos < matroska->segment_start)
1915  continue;
1916 
1917  elem = matroska_find_level1_elem(matroska, id, pos);
1918  if (!elem || elem->parsed)
1919  continue;
1920 
1921  elem->pos = pos;
1922 
1923  // defer cues parsing until we actually need cue data.
1924  if (id == MATROSKA_ID_CUES)
1925  continue;
1926 
1927  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1928  // mark index as broken
1929  matroska->cues_parsing_deferred = -1;
1930  break;
1931  }
1932 
1933  elem->parsed = 1;
1934  }
1935 }
1936 
1938 {
1939  EbmlList *index_list;
1941  uint64_t index_scale = 1;
1942  int i, j;
1943 
1944  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1945  return;
1946 
1947  index_list = &matroska->index;
1948  index = index_list->elem;
1949  if (index_list->nb_elem < 2)
1950  return;
1951  if (index[1].time > 1E14 / matroska->time_scale) {
1952  av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1953  return;
1954  }
1955  for (i = 0; i < index_list->nb_elem; i++) {
1956  EbmlList *pos_list = &index[i].pos;
1957  MatroskaIndexPos *pos = pos_list->elem;
1958  for (j = 0; j < pos_list->nb_elem; j++) {
1959  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1960  pos[j].track);
1961  if (track && track->stream)
1962  av_add_index_entry(track->stream,
1963  pos[j].pos + matroska->segment_start,
1964  index[i].time / index_scale, 0, 0,
1966  }
1967  }
1968 }
1969 
1971  int i;
1972 
1973  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1974  return;
1975 
1976  for (i = 0; i < matroska->num_level1_elems; i++) {
1977  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1978  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1979  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1980  matroska->cues_parsing_deferred = -1;
1981  elem->parsed = 1;
1982  break;
1983  }
1984  }
1985 
1986  matroska_add_index_entries(matroska);
1987 }
1988 
1990 {
1991  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1992  int profile;
1993 
1994  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1995  if (strstr(codec_id, aac_profiles[profile]))
1996  break;
1997  return profile + 1;
1998 }
1999 
2000 static int matroska_aac_sri(int samplerate)
2001 {
2002  int sri;
2003 
2004  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
2005  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
2006  break;
2007  return sri;
2008 }
2009 
2010 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
2011 {
2012  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
2013  avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
2014 }
2015 
2017  MatroskaTrack *track,
2018  int *offset)
2019 {
2020  AVStream *st = track->stream;
2021  uint8_t *p = track->codec_priv.data;
2022  int size = track->codec_priv.size;
2023 
2024  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
2025  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
2026  track->codec_priv.size = 0;
2027  return 0;
2028  }
2029  *offset = 8;
2030  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
2031 
2032  p += track->codec_priv.size;
2033  size -= track->codec_priv.size;
2034 
2035  /* parse the remaining metadata blocks if present */
2036  while (size >= 4) {
2037  int block_last, block_type, block_size;
2038 
2039  flac_parse_block_header(p, &block_last, &block_type, &block_size);
2040 
2041  p += 4;
2042  size -= 4;
2043  if (block_size > size)
2044  return 0;
2045 
2046  /* check for the channel mask */
2047  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
2048  AVDictionary *dict = NULL;
2049  AVDictionaryEntry *chmask;
2050 
2051  ff_vorbis_comment(s, &dict, p, block_size, 0);
2052  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
2053  if (chmask) {
2054  uint64_t mask = strtol(chmask->value, NULL, 0);
2055  if (!mask || mask & ~0x3ffffULL) {
2057  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2058  } else
2059  st->codecpar->channel_layout = mask;
2060  }
2061  av_dict_free(&dict);
2062  }
2063 
2064  p += block_size;
2065  size -= block_size;
2066  }
2067 
2068  return 0;
2069 }
2070 
2071 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2072 {
2073  int minor, micro, bttb = 0;
2074 
2075  /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2076  * this function, and fixed in 57.52 */
2077  if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf57.%d.%d", &minor, &micro) == 2)
2078  bttb = (minor >= 36 && minor <= 51 && micro >= 100);
2079 
2080  switch (field_order) {
2082  return AV_FIELD_PROGRESSIVE;
2084  return AV_FIELD_UNKNOWN;
2086  return AV_FIELD_TT;
2088  return AV_FIELD_BB;
2090  return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2092  return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2093  default:
2094  return AV_FIELD_UNKNOWN;
2095  }
2096 }
2097 
2098 static void mkv_stereo_mode_display_mul(int stereo_mode,
2099  int *h_width, int *h_height)
2100 {
2101  switch (stereo_mode) {
2107  break;
2112  *h_width = 2;
2113  break;
2118  *h_height = 2;
2119  break;
2120  }
2121 }
2122 
2123 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2124  const MatroskaTrackVideoColor *color = track->video.color.elem;
2125  const MatroskaMasteringMeta *mastering_meta;
2126  int has_mastering_primaries, has_mastering_luminance;
2127 
2128  if (!track->video.color.nb_elem)
2129  return 0;
2130 
2131  mastering_meta = &color->mastering_meta;
2132  // Mastering primaries are CIE 1931 coords, and must be > 0.
2133  has_mastering_primaries =
2134  mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2135  mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2136  mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2137  mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2138  has_mastering_luminance = mastering_meta->max_luminance >
2139  mastering_meta->min_luminance.el.f &&
2140  mastering_meta->min_luminance.el.f >= 0 &&
2141  mastering_meta->min_luminance.count;
2142 
2145  if (color->primaries != AVCOL_PRI_RESERVED &&
2146  color->primaries != AVCOL_PRI_RESERVED0)
2147  st->codecpar->color_primaries = color->primaries;
2151  if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2152  color->range <= AVCOL_RANGE_JPEG)
2153  st->codecpar->color_range = color->range;
2158  st->codecpar->chroma_location =
2160  (color->chroma_siting_vert - 1) << 7);
2161  }
2162  if (color->max_cll && color->max_fall) {
2163  size_t size = 0;
2164  int ret;
2166  if (!metadata)
2167  return AVERROR(ENOMEM);
2169  (uint8_t *)metadata, size);
2170  if (ret < 0) {
2171  av_freep(&metadata);
2172  return ret;
2173  }
2174  metadata->MaxCLL = color->max_cll;
2175  metadata->MaxFALL = color->max_fall;
2176  }
2177 
2178  if (has_mastering_primaries || has_mastering_luminance) {
2179  AVMasteringDisplayMetadata *metadata =
2182  sizeof(AVMasteringDisplayMetadata));
2183  if (!metadata) {
2184  return AVERROR(ENOMEM);
2185  }
2186  memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2187  if (has_mastering_primaries) {
2188  metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2189  metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2190  metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2191  metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2192  metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2193  metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2194  metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2195  metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2196  metadata->has_primaries = 1;
2197  }
2198  if (has_mastering_luminance) {
2199  metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2200  metadata->min_luminance = av_d2q(mastering_meta->min_luminance.el.f, INT_MAX);
2201  metadata->has_luminance = 1;
2202  }
2203  }
2204  return 0;
2205 }
2206 
2208  void *logctx)
2209 {
2210  AVSphericalMapping *spherical;
2211  const MatroskaTrackVideoProjection *mkv_projection = &track->video.projection;
2212  const uint8_t *priv_data = mkv_projection->private.data;
2213  enum AVSphericalProjection projection;
2214  size_t spherical_size;
2215  uint32_t l = 0, t = 0, r = 0, b = 0;
2216  uint32_t padding = 0;
2217  int ret;
2218 
2219  if (mkv_projection->private.size && priv_data[0] != 0) {
2220  av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
2221  return 0;
2222  }
2223 
2224  switch (track->video.projection.type) {
2226  if (track->video.projection.private.size == 20) {
2227  t = AV_RB32(priv_data + 4);
2228  b = AV_RB32(priv_data + 8);
2229  l = AV_RB32(priv_data + 12);
2230  r = AV_RB32(priv_data + 16);
2231 
2232  if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2233  av_log(logctx, AV_LOG_ERROR,
2234  "Invalid bounding rectangle coordinates "
2235  "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2236  l, t, r, b);
2237  return AVERROR_INVALIDDATA;
2238  }
2239  } else if (track->video.projection.private.size != 0) {
2240  av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2241  return AVERROR_INVALIDDATA;
2242  }
2243 
2244  if (l || t || r || b)
2245  projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2246  else
2247  projection = AV_SPHERICAL_EQUIRECTANGULAR;
2248  break;
2250  if (track->video.projection.private.size < 4) {
2251  av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
2252  return AVERROR_INVALIDDATA;
2253  } else if (track->video.projection.private.size == 12) {
2254  uint32_t layout = AV_RB32(priv_data + 4);
2255  if (layout) {
2256  av_log(logctx, AV_LOG_WARNING,
2257  "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2258  return 0;
2259  }
2260  projection = AV_SPHERICAL_CUBEMAP;
2261  padding = AV_RB32(priv_data + 8);
2262  } else {
2263  av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2264  return AVERROR_INVALIDDATA;
2265  }
2266  break;
2268  /* No Spherical metadata */
2269  return 0;
2270  default:
2271  av_log(logctx, AV_LOG_WARNING,
2272  "Unknown spherical metadata type %"PRIu64"\n",
2273  track->video.projection.type);
2274  return 0;
2275  }
2276 
2277  spherical = av_spherical_alloc(&spherical_size);
2278  if (!spherical)
2279  return AVERROR(ENOMEM);
2280 
2281  spherical->projection = projection;
2282 
2283  spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2284  spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2285  spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2286 
2287  spherical->padding = padding;
2288 
2289  spherical->bound_left = l;
2290  spherical->bound_top = t;
2291  spherical->bound_right = r;
2292  spherical->bound_bottom = b;
2293 
2294  ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2295  spherical_size);
2296  if (ret < 0) {
2297  av_freep(&spherical);
2298  return ret;
2299  }
2300 
2301  return 0;
2302 }
2303 
2304 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2305 {
2306  const AVCodecTag *codec_tags;
2307 
2308  codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2310 
2311  /* Normalize noncompliant private data that starts with the fourcc
2312  * by expanding/shifting the data by 4 bytes and storing the data
2313  * size at the start. */
2314  if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2315  int ret = av_buffer_realloc(&track->codec_priv.buf,
2317  if (ret < 0)
2318  return ret;
2319 
2320  track->codec_priv.data = track->codec_priv.buf->data;
2321  memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2322  track->codec_priv.size += 4;
2323  AV_WB32(track->codec_priv.data, track->codec_priv.size);
2324  }
2325 
2326  *fourcc = AV_RL32(track->codec_priv.data + 4);
2327  *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2328 
2329  return 0;
2330 }
2331 
2333 {
2334  MatroskaDemuxContext *matroska = s->priv_data;
2335  MatroskaTrack *tracks = matroska->tracks.elem;
2336  AVStream *st;
2337  int i, j, ret;
2338  int k;
2339 
2340  for (i = 0; i < matroska->tracks.nb_elem; i++) {
2341  MatroskaTrack *track = &tracks[i];
2343  EbmlList *encodings_list = &track->encodings;
2344  MatroskaTrackEncoding *encodings = encodings_list->elem;
2345  uint8_t *extradata = NULL;
2346  int extradata_size = 0;
2347  int extradata_offset = 0;
2348  uint32_t fourcc = 0;
2349  AVIOContext b;
2350  char* key_id_base64 = NULL;
2351  int bit_depth = -1;
2352 
2353  /* Apply some sanity checks. */
2354  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2355  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2356  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2357  track->type != MATROSKA_TRACK_TYPE_METADATA) {
2358  av_log(matroska->ctx, AV_LOG_INFO,
2359  "Unknown or unsupported track type %"PRIu64"\n",
2360  track->type);
2361  continue;
2362  }
2363  if (!track->codec_id)
2364  continue;
2365 
2366  if ( track->type == MATROSKA_TRACK_TYPE_AUDIO && track->codec_id[0] != 'A'
2367  || track->type == MATROSKA_TRACK_TYPE_VIDEO && track->codec_id[0] != 'V'
2368  || track->type == MATROSKA_TRACK_TYPE_SUBTITLE && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2369  || track->type == MATROSKA_TRACK_TYPE_METADATA && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2370  ) {
2371  av_log(matroska->ctx, AV_LOG_INFO, "Inconsistent track type\n");
2372  continue;
2373  }
2374 
2375  if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2376  isnan(track->audio.samplerate)) {
2377  av_log(matroska->ctx, AV_LOG_WARNING,
2378  "Invalid sample rate %f, defaulting to 8000 instead.\n",
2379  track->audio.samplerate);
2380  track->audio.samplerate = 8000;
2381  }
2382 
2383  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2384  if (!track->default_duration && track->video.frame_rate > 0) {
2385  double default_duration = 1000000000 / track->video.frame_rate;
2386  if (default_duration > UINT64_MAX || default_duration < 0) {
2387  av_log(matroska->ctx, AV_LOG_WARNING,
2388  "Invalid frame rate %e. Cannot calculate default duration.\n",
2389  track->video.frame_rate);
2390  } else {
2391  track->default_duration = default_duration;
2392  }
2393  }
2394  if (track->video.display_width == -1)
2395  track->video.display_width = track->video.pixel_width;
2396  if (track->video.display_height == -1)
2397  track->video.display_height = track->video.pixel_height;
2398  if (track->video.color_space.size == 4)
2399  fourcc = AV_RL32(track->video.color_space.data);
2400  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2401  if (!track->audio.out_samplerate)
2402  track->audio.out_samplerate = track->audio.samplerate;
2403  }
2404  if (encodings_list->nb_elem > 1) {
2405  av_log(matroska->ctx, AV_LOG_ERROR,
2406  "Multiple combined encodings not supported");
2407  } else if (encodings_list->nb_elem == 1) {
2408  if (encodings[0].type) {
2409  if (encodings[0].encryption.key_id.size > 0) {
2410  /* Save the encryption key id to be stored later as a
2411  metadata tag. */
2412  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2413  key_id_base64 = av_malloc(b64_size);
2414  if (key_id_base64 == NULL)
2415  return AVERROR(ENOMEM);
2416 
2417  av_base64_encode(key_id_base64, b64_size,
2418  encodings[0].encryption.key_id.data,
2419  encodings[0].encryption.key_id.size);
2420  } else {
2421  encodings[0].scope = 0;
2422  av_log(matroska->ctx, AV_LOG_ERROR,
2423  "Unsupported encoding type");
2424  }
2425  } else if (
2426 #if CONFIG_ZLIB
2427  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2428 #endif
2429 #if CONFIG_BZLIB
2431 #endif
2432 #if CONFIG_LZO
2434 #endif
2436  encodings[0].scope = 0;
2437  av_log(matroska->ctx, AV_LOG_ERROR,
2438  "Unsupported encoding type");
2439  } else if (track->codec_priv.size && encodings[0].scope & 2) {
2440  uint8_t *codec_priv = track->codec_priv.data;
2441  int ret = matroska_decode_buffer(&track->codec_priv.data,
2442  &track->codec_priv.size,
2443  track);
2444  if (ret < 0) {
2445  track->codec_priv.data = NULL;
2446  track->codec_priv.size = 0;
2447  av_log(matroska->ctx, AV_LOG_ERROR,
2448  "Failed to decode codec private data\n");
2449  }
2450 
2451  if (codec_priv != track->codec_priv.data) {
2452  av_buffer_unref(&track->codec_priv.buf);
2453  if (track->codec_priv.data) {
2454  track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2456  NULL, NULL, 0);
2457  if (!track->codec_priv.buf) {
2458  av_freep(&track->codec_priv.data);
2459  track->codec_priv.size = 0;
2460  return AVERROR(ENOMEM);
2461  }
2462  }
2463  }
2464  }
2465  }
2466  track->needs_decoding = encodings && !encodings[0].type &&
2467  encodings[0].scope & 1 &&
2468  (encodings[0].compression.algo !=
2470  encodings[0].compression.settings.size);
2471 
2472  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2473  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2474  strlen(ff_mkv_codec_tags[j].str))) {
2475  codec_id = ff_mkv_codec_tags[j].id;
2476  break;
2477  }
2478  }
2479 
2480  st = track->stream = avformat_new_stream(s, NULL);
2481  if (!st) {
2482  av_free(key_id_base64);
2483  return AVERROR(ENOMEM);
2484  }
2485 
2486  if (key_id_base64) {
2487  /* export encryption key id as base64 metadata tag */
2488  av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2490  }
2491 
2492  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2493  track->codec_priv.size >= 40 &&
2494  track->codec_priv.data) {
2495  track->ms_compat = 1;
2496  bit_depth = AV_RL16(track->codec_priv.data + 14);
2497  fourcc = AV_RL32(track->codec_priv.data + 16);
2499  fourcc);
2500  if (!codec_id)
2502  fourcc);
2503  extradata_offset = 40;
2504  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2505  track->codec_priv.size >= 14 &&
2506  track->codec_priv.data) {
2507  int ret;
2508  ffio_init_context(&b, track->codec_priv.data,
2509  track->codec_priv.size,
2510  0, NULL, NULL, NULL, NULL);
2511  ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2512  if (ret < 0)
2513  return ret;
2514  codec_id = st->codecpar->codec_id;
2515  fourcc = st->codecpar->codec_tag;
2516  extradata_offset = FFMIN(track->codec_priv.size, 18);
2517  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2518  /* Normally 36, but allow noncompliant private data */
2519  && (track->codec_priv.size >= 32)
2520  && (track->codec_priv.data)) {
2521  uint16_t sample_size;
2522  int ret = get_qt_codec(track, &fourcc, &codec_id);
2523  if (ret < 0)
2524  return ret;
2525  sample_size = AV_RB16(track->codec_priv.data + 26);
2526  if (fourcc == 0) {
2527  if (sample_size == 8) {
2528  fourcc = MKTAG('r','a','w',' ');
2529  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2530  } else if (sample_size == 16) {
2531  fourcc = MKTAG('t','w','o','s');
2532  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2533  }
2534  }
2535  if ((fourcc == MKTAG('t','w','o','s') ||
2536  fourcc == MKTAG('s','o','w','t')) &&
2537  sample_size == 8)
2538  codec_id = AV_CODEC_ID_PCM_S8;
2539  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2540  (track->codec_priv.size >= 21) &&
2541  (track->codec_priv.data)) {
2542  int ret = get_qt_codec(track, &fourcc, &codec_id);
2543  if (ret < 0)
2544  return ret;
2545  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2546  fourcc = MKTAG('S','V','Q','3');
2547  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2548  }
2549  if (codec_id == AV_CODEC_ID_NONE)
2550  av_log(matroska->ctx, AV_LOG_ERROR,
2551  "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2552  if (track->codec_priv.size >= 86) {
2553  bit_depth = AV_RB16(track->codec_priv.data + 82);
2554  ffio_init_context(&b, track->codec_priv.data,
2555  track->codec_priv.size,
2556  0, NULL, NULL, NULL, NULL);
2557  if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2558  bit_depth &= 0x1F;
2559  track->has_palette = 1;
2560  }
2561  }
2562  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2563  switch (track->audio.bitdepth) {
2564  case 8:
2565  codec_id = AV_CODEC_ID_PCM_U8;
2566  break;
2567  case 24:
2568  codec_id = AV_CODEC_ID_PCM_S24BE;
2569  break;
2570  case 32:
2571  codec_id = AV_CODEC_ID_PCM_S32BE;
2572  break;
2573  }
2574  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2575  switch (track->audio.bitdepth) {
2576  case 8:
2577  codec_id = AV_CODEC_ID_PCM_U8;
2578  break;
2579  case 24:
2580  codec_id = AV_CODEC_ID_PCM_S24LE;
2581  break;
2582  case 32:
2583  codec_id = AV_CODEC_ID_PCM_S32LE;
2584  break;
2585  }
2586  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2587  track->audio.bitdepth == 64) {
2588  codec_id = AV_CODEC_ID_PCM_F64LE;
2589  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2590  int profile = matroska_aac_profile(track->codec_id);
2591  int sri = matroska_aac_sri(track->audio.samplerate);
2592  extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2593  if (!extradata)
2594  return AVERROR(ENOMEM);
2595  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2596  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2597  if (strstr(track->codec_id, "SBR")) {
2598  sri = matroska_aac_sri(track->audio.out_samplerate);
2599  extradata[2] = 0x56;
2600  extradata[3] = 0xE5;
2601  extradata[4] = 0x80 | (sri << 3);
2602  extradata_size = 5;
2603  } else
2604  extradata_size = 2;
2605  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2606  /* Only ALAC's magic cookie is stored in Matroska's track headers.
2607  * Create the "atom size", "tag", and "tag version" fields the
2608  * decoder expects manually. */
2609  extradata_size = 12 + track->codec_priv.size;
2610  extradata = av_mallocz(extradata_size +
2612  if (!extradata)
2613  return AVERROR(ENOMEM);
2614  AV_WB32(extradata, extradata_size);
2615  memcpy(&extradata[4], "alac", 4);
2616  AV_WB32(&extradata[8], 0);
2617  memcpy(&extradata[12], track->codec_priv.data,
2618  track->codec_priv.size);
2619  } else if (codec_id == AV_CODEC_ID_TTA) {
2620  uint8_t *ptr;
2621  if (track->audio.channels > UINT16_MAX ||
2622  track->audio.bitdepth > UINT16_MAX) {
2623  av_log(matroska->ctx, AV_LOG_WARNING,
2624  "Too large audio channel number %"PRIu64
2625  " or bitdepth %"PRIu64". Skipping track.\n",
2626  track->audio.channels, track->audio.bitdepth);
2627  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2628  return AVERROR_INVALIDDATA;
2629  else
2630  continue;
2631  }
2632  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2633  return AVERROR_INVALIDDATA;
2634  extradata_size = 22;
2635  extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2636  if (!extradata)
2637  return AVERROR(ENOMEM);
2638  ptr = extradata;
2639  bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2640  bytestream_put_le16(&ptr, 1);
2641  bytestream_put_le16(&ptr, track->audio.channels);
2642  bytestream_put_le16(&ptr, track->audio.bitdepth);
2643  bytestream_put_le32(&ptr, track->audio.out_samplerate);
2644  bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2645  track->audio.out_samplerate,
2646  AV_TIME_BASE * 1000));
2647  } else if (codec_id == AV_CODEC_ID_RV10 ||
2648  codec_id == AV_CODEC_ID_RV20 ||
2649  codec_id == AV_CODEC_ID_RV30 ||
2650  codec_id == AV_CODEC_ID_RV40) {
2651  extradata_offset = 26;
2652  } else if (codec_id == AV_CODEC_ID_RA_144) {
2653  track->audio.out_samplerate = 8000;
2654  track->audio.channels = 1;
2655  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2656  codec_id == AV_CODEC_ID_COOK ||
2657  codec_id == AV_CODEC_ID_ATRAC3 ||
2658  codec_id == AV_CODEC_ID_SIPR)
2659  && track->codec_priv.data) {
2660  int flavor;
2661 
2662  ffio_init_context(&b, track->codec_priv.data,
2663  track->codec_priv.size,
2664  0, NULL, NULL, NULL, NULL);
2665  avio_skip(&b, 22);
2666  flavor = avio_rb16(&b);
2667  track->audio.coded_framesize = avio_rb32(&b);
2668  avio_skip(&b, 12);
2669  track->audio.sub_packet_h = avio_rb16(&b);
2670  track->audio.frame_size = avio_rb16(&b);
2671  track->audio.sub_packet_size = avio_rb16(&b);
2672  if (track->audio.coded_framesize <= 0 ||
2673  track->audio.sub_packet_h <= 0 ||
2674  track->audio.frame_size <= 0)
2675  return AVERROR_INVALIDDATA;
2676 
2677  if (codec_id == AV_CODEC_ID_RA_288) {
2678  if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
2679  != (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
2680  return AVERROR_INVALIDDATA;
2681  st->codecpar->block_align = track->audio.coded_framesize;
2682  track->codec_priv.size = 0;
2683  } else {
2684  if (codec_id == AV_CODEC_ID_SIPR) {
2685  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2686  if (flavor > 3)
2687  return AVERROR_INVALIDDATA;
2688  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2689  st->codecpar->bit_rate = sipr_bit_rate[flavor];
2690  } else if (track->audio.sub_packet_size <= 0 ||
2691  track->audio.frame_size % track->audio.sub_packet_size)
2692  return AVERROR_INVALIDDATA;
2693  st->codecpar->block_align = track->audio.sub_packet_size;
2694  extradata_offset = 78;
2695  }
2696  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2697  track->audio.frame_size);
2698  if (!track->audio.buf)
2699  return AVERROR(ENOMEM);
2700  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2701  ret = matroska_parse_flac(s, track, &extradata_offset);
2702  if (ret < 0)
2703  return ret;
2704  } else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
2705  av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
2706  "in absence of valid CodecPrivate.\n");
2707  extradata_size = 2;
2708  extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
2709  if (!extradata)
2710  return AVERROR(ENOMEM);
2711  AV_WL16(extradata, 0x410);
2712  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2713  fourcc = AV_RL32(track->codec_priv.data);
2714  } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2715  /* we don't need any value stored in CodecPrivate.
2716  make sure that it's not exported as extradata. */
2717  track->codec_priv.size = 0;
2718  } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2719  /* For now, propagate only the OBUs, if any. Once libavcodec is
2720  updated to handle isobmff style extradata this can be removed. */
2721  extradata_offset = 4;
2722  }
2723  track->codec_priv.size -= extradata_offset;
2724 
2725  if (codec_id == AV_CODEC_ID_NONE)
2726  av_log(matroska->ctx, AV_LOG_INFO,
2727  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2728 
2729  if (track->time_scale < 0.01) {
2730  av_log(matroska->ctx, AV_LOG_WARNING,
2731  "Track TimestampScale too small %f, assuming 1.0.\n",
2732  track->time_scale);
2733  track->time_scale = 1.0;
2734  }
2735  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2736  1000 * 1000 * 1000); /* 64 bit pts in ns */
2737 
2738  /* convert the delay from ns to the track timebase */
2740  (AVRational){ 1, 1000000000 },
2741  st->time_base);
2742 
2743  st->codecpar->codec_id = codec_id;
2744 
2745  if (strcmp(track->language, "und"))
2746  av_dict_set(&st->metadata, "language", track->language, 0);
2747  av_dict_set(&st->metadata, "title", track->name, 0);
2748 
2749  if (track->flag_default)
2751  if (track->flag_forced)
2753  if (track->flag_comment)
2755  if (track->flag_hearingimpaired)
2757  if (track->flag_visualimpaired)
2759 
2760  if (!st->codecpar->extradata) {
2761  if (extradata) {
2762  st->codecpar->extradata = extradata;
2763  st->codecpar->extradata_size = extradata_size;
2764  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2765  if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2766  return AVERROR(ENOMEM);
2767  memcpy(st->codecpar->extradata,
2768  track->codec_priv.data + extradata_offset,
2769  track->codec_priv.size);
2770  }
2771  }
2772 
2773  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2775  int display_width_mul = 1;
2776  int display_height_mul = 1;
2777 
2779  st->codecpar->codec_tag = fourcc;
2780  if (bit_depth >= 0)
2782  st->codecpar->width = track->video.pixel_width;
2783  st->codecpar->height = track->video.pixel_height;
2784 
2786  st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2789 
2791  mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2792 
2795  &st->sample_aspect_ratio.den,
2796  st->codecpar->height * track->video.display_width * display_width_mul,
2797  st->codecpar->width * track->video.display_height * display_height_mul,
2798  255);
2799  }
2800  if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2802 
2803  if (track->default_duration) {
2805  1000000000, track->default_duration, 30000);
2806 #if FF_API_R_FRAME_RATE
2807  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2808  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2809  st->r_frame_rate = st->avg_frame_rate;
2810 #endif
2811  }
2812 
2813  /* export stereo mode flag as metadata tag */
2815  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2816 
2817  /* export alpha mode flag as metadata tag */
2818  if (track->video.alpha_mode)
2819  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2820 
2821  /* if we have virtual track, mark the real tracks */
2822  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2823  char buf[32];
2824  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2825  continue;
2826  snprintf(buf, sizeof(buf), "%s_%d",
2827  ff_matroska_video_stereo_plane[planes[j].type], i);
2828  for (k=0; k < matroska->tracks.nb_elem; k++)
2829  if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2830  av_dict_set(&tracks[k].stream->metadata,
2831  "stereo_mode", buf, 0);
2832  break;
2833  }
2834  }
2835  // add stream level stereo3d side data if it is a supported format
2837  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2838  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2839  if (ret < 0)
2840  return ret;
2841  }
2842 
2843  ret = mkv_parse_video_color(st, track);
2844  if (ret < 0)
2845  return ret;
2846  ret = mkv_parse_video_projection(st, track, matroska->ctx);
2847  if (ret < 0)
2848  return ret;
2849  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2851  st->codecpar->codec_tag = fourcc;
2852  st->codecpar->sample_rate = track->audio.out_samplerate;
2853  st->codecpar->channels = track->audio.channels;
2854  if (!st->codecpar->bits_per_coded_sample)
2856  if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2857  st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2860  else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2862  if (track->codec_delay > 0) {
2864  (AVRational){1, 1000000000},
2865  (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2866  48000 : st->codecpar->sample_rate});
2867  }
2868  if (track->seek_preroll > 0) {
2870  (AVRational){1, 1000000000},
2871  (AVRational){1, st->codecpar->sample_rate});
2872  }
2873  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2875 
2876  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2878  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2880  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2882  }
2883  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2885 
2886  if (track->flag_textdescriptions)
2888  }
2889  }
2890 
2891  return 0;
2892 }
2893 
2895 {
2896  MatroskaDemuxContext *matroska = s->priv_data;
2897  EbmlList *attachments_list = &matroska->attachments;
2898  EbmlList *chapters_list = &matroska->chapters;
2899  MatroskaAttachment *attachments;
2900  MatroskaChapter *chapters;
2901  uint64_t max_start = 0;
2902  int64_t pos;
2903  Ebml ebml = { 0 };
2904  int i, j, res;
2905 
2906  matroska->ctx = s;
2907  matroska->cues_parsing_deferred = 1;
2908 
2909  /* First read the EBML header. */
2910  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2911  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2912  ebml_free(ebml_syntax, &ebml);
2913  return AVERROR_INVALIDDATA;
2914  }
2915  if (ebml.version > EBML_VERSION ||
2916  ebml.max_size > sizeof(uint64_t) ||
2917  ebml.id_length > sizeof(uint32_t) ||
2918  ebml.doctype_version > 3) {
2920  "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2921  ebml.version, ebml.doctype, ebml.doctype_version);
2922  ebml_free(ebml_syntax, &ebml);
2923  return AVERROR_PATCHWELCOME;
2924  } else if (ebml.doctype_version == 3) {
2925  av_log(matroska->ctx, AV_LOG_WARNING,
2926  "EBML header using unsupported features\n"
2927  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2928  ebml.version, ebml.doctype, ebml.doctype_version);
2929  }
2930  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2931  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2932  break;
2933  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2934  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2935  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2936  ebml_free(ebml_syntax, &ebml);
2937  return AVERROR_INVALIDDATA;
2938  }
2939  }
2940  ebml_free(ebml_syntax, &ebml);
2941 
2942  /* The next thing is a segment. */
2943  pos = avio_tell(matroska->ctx->pb);
2944  res = ebml_parse(matroska, matroska_segments, matroska);
2945  // Try resyncing until we find an EBML_STOP type element.
2946  while (res != 1) {
2947  res = matroska_resync(matroska, pos);
2948  if (res < 0)
2949  goto fail;
2950  pos = avio_tell(matroska->ctx->pb);
2951  res = ebml_parse(matroska, matroska_segment, matroska);
2952  }
2953  /* Set data_offset as it might be needed later by seek_frame_generic. */
2954  if (matroska->current_id == MATROSKA_ID_CLUSTER)
2955  s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2956  matroska_execute_seekhead(matroska);
2957 
2958  if (!matroska->time_scale)
2959  matroska->time_scale = 1000000;
2960  if (matroska->duration)
2961  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2962  1000 / AV_TIME_BASE;
2963  av_dict_set(&s->metadata, "title", matroska->title, 0);
2964  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2965 
2966  if (matroska->date_utc.size == 8)
2968 
2969  res = matroska_parse_tracks(s);
2970  if (res < 0)
2971  goto fail;
2972 
2973  attachments = attachments_list->elem;
2974  for (j = 0; j < attachments_list->nb_elem; j++) {
2975  if (!(attachments[j].filename && attachments[j].mime &&
2976  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2977  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2978  } else {
2979  AVStream *st = avformat_new_stream(s, NULL);
2980  if (!st)
2981  break;
2982  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2983  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2984  if (attachments[j].description)
2985  av_dict_set(&st->metadata, "title", attachments[j].description, 0);
2987 
2988  for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2989  if (!strncmp(mkv_image_mime_tags[i].str, attachments[j].mime,
2990  strlen(mkv_image_mime_tags[i].str))) {
2991  st->codecpar->codec_id = mkv_image_mime_tags[i].id;
2992  break;
2993  }
2994  }
2995 
2996  attachments[j].stream = st;
2997 
2998  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2999  AVPacket *pkt = &st->attached_pic;
3000 
3003 
3004  av_init_packet(pkt);
3005  pkt->buf = attachments[j].bin.buf;
3006  attachments[j].bin.buf = NULL;
3007  pkt->data = attachments[j].bin.data;
3008  pkt->size = attachments[j].bin.size;
3009  pkt->stream_index = st->index;
3010  pkt->flags |= AV_PKT_FLAG_KEY;
3011  } else {
3013  if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
3014  break;
3015  memcpy(st->codecpar->extradata, attachments[j].bin.data,
3016  attachments[j].bin.size);
3017 
3018  for (i = 0; mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
3019  if (!strncmp(mkv_mime_tags[i].str, attachments[j].mime,
3020  strlen(mkv_mime_tags[i].str))) {
3021  st->codecpar->codec_id = mkv_mime_tags[i].id;
3022  break;
3023  }
3024  }
3025  }
3026  }
3027  }
3028 
3029  chapters = chapters_list->elem;
3030  for (i = 0; i < chapters_list->nb_elem; i++)
3031  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
3032  (max_start == 0 || chapters[i].start > max_start)) {
3033  chapters[i].chapter =
3034  avpriv_new_chapter(s, chapters[i].uid,
3035  (AVRational) { 1, 1000000000 },
3036  chapters[i].start, chapters[i].end,
3037  chapters[i].title);
3038  max_start = chapters[i].start;
3039  }
3040 
3041  matroska_add_index_entries(matroska);
3042 
3044 
3045  return 0;
3046 fail:
3048  return res;
3049 }
3050 
3051 /*
3052  * Put one packet in an application-supplied AVPacket struct.
3053  * Returns 0 on success or -1 on failure.
3054  */
3056  AVPacket *pkt)
3057 {
3058  if (matroska->queue) {
3059  MatroskaTrack *tracks = matroska->tracks.elem;
3060  MatroskaTrack *track;
3061 
3062  avpriv_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
3063  track = &tracks[pkt->stream_index];
3064  if (track->has_palette) {
3066  if (!pal) {
3067  av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
3068  } else {
3069  memcpy(pal, track->palette, AVPALETTE_SIZE);
3070  }
3071  track->has_palette = 0;
3072  }
3073  return 0;
3074  }
3075 
3076  return -1;
3077 }
3078 
3079 /*
3080  * Free all packets in our internal queue.
3081  */
3083 {
3084  avpriv_packet_list_free(&matroska->queue, &matroska->queue_end);
3085 }
3086 
3088  int size, int type, AVIOContext *pb,
3089  uint32_t lace_size[256], int *laces)
3090 {
3091  int n;
3092  uint8_t *data = *buf;
3093 
3094  if (!type) {
3095  *laces = 1;
3096  lace_size[0] = size;
3097  return 0;
3098  }
3099 
3100  if (size <= 0)
3101  return AVERROR_INVALIDDATA;
3102 
3103  *laces = *data + 1;
3104  data += 1;
3105  size -= 1;
3106 
3107  switch (type) {
3108  case 0x1: /* Xiph lacing */
3109  {
3110  uint8_t temp;
3111  uint32_t total = 0;
3112  for (n = 0; n < *laces - 1; n++) {
3113  lace_size[n] = 0;
3114 
3115  do {
3116  if (size <= total)
3117  return AVERROR_INVALIDDATA;
3118  temp = *data;
3119  total += temp;
3120  lace_size[n] += temp;
3121  data += 1;
3122  size -= 1;
3123  } while (temp == 0xff);
3124  }
3125  if (size < total)
3126  return AVERROR_INVALIDDATA;
3127 
3128  lace_size[n] = size - total;
3129  break;
3130  }
3131 
3132  case 0x2: /* fixed-size lacing */
3133  if (size % (*laces))
3134  return AVERROR_INVALIDDATA;
3135  for (n = 0; n < *laces; n++)
3136  lace_size[n] = size / *laces;
3137  break;
3138 
3139  case 0x3: /* EBML lacing */
3140  {
3141  uint64_t num;
3142  uint64_t total;
3143  int offset;
3144 
3145  avio_skip(pb, 4);
3146 
3147  n = ebml_read_num(matroska, pb, 8, &num, 1);
3148  if (n < 0)
3149  return n;
3150  if (num > INT_MAX)
3151  return AVERROR_INVALIDDATA;
3152 
3153  total = lace_size[0] = num;
3154  offset = n;
3155  for (n = 1; n < *laces - 1; n++) {
3156  int64_t snum;
3157  int r;
3158  r = matroska_ebmlnum_sint(matroska, pb, &snum);
3159  if (r < 0)
3160  return r;
3161  if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3162  return AVERROR_INVALIDDATA;
3163 
3164  lace_size[n] = lace_size[n - 1] + snum;
3165  total += lace_size[n];
3166  offset += r;
3167  }
3168  data += offset;
3169  size -= offset;
3170  if (size < total)
3171  return AVERROR_INVALIDDATA;
3172 
3173  lace_size[*laces - 1] = size - total;
3174  break;
3175  }
3176  }
3177 
3178  *buf = data;
3179 
3180  return 0;
3181 }
3182 
3184  MatroskaTrack *track, AVStream *st,
3185  uint8_t *data, int size, uint64_t timecode,
3186  int64_t pos)
3187 {
3188  const int a = st->codecpar->block_align;
3189  const int sps = track->audio.sub_packet_size;
3190  const int cfs = track->audio.coded_framesize;
3191  const int h = track->audio.sub_packet_h;
3192  const int w = track->audio.frame_size;
3193  int y = track->audio.sub_packet_cnt;
3194  int x;
3195 
3196  if (!track->audio.pkt_cnt) {
3197  if (track->audio.sub_packet_cnt == 0)
3198  track->audio.buf_timecode = timecode;
3199  if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3200  if (size < cfs * h / 2) {
3201  av_log(matroska->ctx, AV_LOG_ERROR,
3202  "Corrupt int4 RM-style audio packet size\n");
3203  return AVERROR_INVALIDDATA;
3204  }
3205  for (x = 0; x < h / 2; x++)
3206  memcpy(track->audio.buf + x * 2 * w + y * cfs,
3207  data + x * cfs, cfs);
3208  } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3209  if (size < w) {
3210  av_log(matroska->ctx, AV_LOG_ERROR,
3211  "Corrupt sipr RM-style audio packet size\n");
3212  return AVERROR_INVALIDDATA;
3213  }
3214  memcpy(track->audio.buf + y * w, data, w);
3215  } else {
3216  if (size < w) {
3217  av_log(matroska->ctx, AV_LOG_ERROR,
3218  "Corrupt generic RM-style audio packet size\n");
3219  return AVERROR_INVALIDDATA;
3220  }
3221  for (x = 0; x < w / sps; x++)
3222  memcpy(track->audio.buf +
3223  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3224  data + x * sps, sps);
3225  }
3226 
3227  if (++track->audio.sub_packet_cnt >= h) {
3228  if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3229  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3230  track->audio.sub_packet_cnt = 0;
3231  track->audio.pkt_cnt = h * w / a;
3232  }
3233  }
3234 
3235  while (track->audio.pkt_cnt) {
3236  int ret;
3237  AVPacket pktl, *pkt = &pktl;
3238 
3239  ret = av_new_packet(pkt, a);
3240  if (ret < 0) {
3241  return ret;
3242  }
3243  memcpy(pkt->data,
3244  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3245  a);
3246  pkt->pts = track->audio.buf_timecode;
3248  pkt->pos = pos;
3249  pkt->stream_index = st->index;
3250  ret = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3251  if (ret < 0) {
3252  av_packet_unref(pkt);
3253  return AVERROR(ENOMEM);
3254  }
3255  }
3256 
3257  return 0;
3258 }
3259 
3260 /* reconstruct full wavpack blocks from mangled matroska ones */
3262  uint8_t **data, int *size)
3263 {
3264  uint8_t *dst = NULL;
3265  uint8_t *src = *data;
3266  int dstlen = 0;
3267  int srclen = *size;
3268  uint32_t samples;
3269  uint16_t ver;
3270  int ret, offset = 0;
3271 
3272  if (srclen < 12)
3273  return AVERROR_INVALIDDATA;
3274 
3275  av_assert1(track->stream->codecpar->extradata_size >= 2);
3276  ver = AV_RL16(track->stream->codecpar->extradata);
3277 
3278  samples = AV_RL32(src);
3279  src += 4;
3280  srclen -= 4;
3281 
3282  while (srclen >= 8) {
3283  int multiblock;
3284  uint32_t blocksize;
3285  uint8_t *tmp;
3286 
3287  uint32_t flags = AV_RL32(src);
3288  uint32_t crc = AV_RL32(src + 4);
3289  src += 8;
3290  srclen -= 8;
3291 
3292  multiblock = (flags & 0x1800) != 0x1800;
3293  if (multiblock) {
3294  if (srclen < 4) {
3295  ret = AVERROR_INVALIDDATA;
3296  goto fail;
3297  }
3298  blocksize = AV_RL32(src);
3299  src += 4;
3300  srclen -= 4;
3301  } else
3302  blocksize = srclen;
3303 
3304  if (blocksize > srclen) {
3305  ret = AVERROR_INVALIDDATA;
3306  goto fail;
3307  }
3308 
3309  tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3310  if (!tmp) {
3311  ret = AVERROR(ENOMEM);
3312  goto fail;
3313  }
3314  dst = tmp;
3315  dstlen += blocksize + 32;
3316 
3317  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3318  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3319  AV_WL16(dst + offset + 8, ver); // version
3320  AV_WL16(dst + offset + 10, 0); // track/index_no
3321  AV_WL32(dst + offset + 12, 0); // total samples
3322  AV_WL32(dst + offset + 16, 0); // block index
3323  AV_WL32(dst + offset + 20, samples); // number of samples
3324  AV_WL32(dst + offset + 24, flags); // flags
3325  AV_WL32(dst + offset + 28, crc); // crc
3326  memcpy(dst + offset + 32, src, blocksize); // block data
3327 
3328  src += blocksize;
3329  srclen -= blocksize;
3330  offset += blocksize + 32;
3331  }
3332 
3333  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3334 
3335  *data = dst;
3336  *size = dstlen;
3337 
3338  return 0;
3339 
3340 fail:
3341  av_freep(&dst);
3342  return ret;
3343 }
3344 
3346  uint8_t **data, int *size)
3347 {
3348  uint8_t *dst;
3349  int dstlen = *size + 8;
3350 
3351  dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3352  if (!dst)
3353  return AVERROR(ENOMEM);
3354 
3355  AV_WB32(dst, dstlen);
3356  AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3357  memcpy(dst + 8, *data, dstlen - 8);
3358  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3359 
3360  *data = dst;
3361  *size = dstlen;
3362 
3363  return 0;
3364 }
3365 
3367  MatroskaTrack *track,
3368  AVStream *st,
3369  uint8_t *data, int data_len,
3370  uint64_t timecode,
3371  uint64_t duration,
3372  int64_t pos)
3373 {
3374  AVPacket pktl, *pkt = &pktl;
3375  uint8_t *id, *settings, *text, *buf;
3376  int id_len, settings_len, text_len;
3377  uint8_t *p, *q;
3378  int err;
3379 
3380  if (data_len <= 0)
3381  return AVERROR_INVALIDDATA;
3382 
3383  p = data;
3384  q = data + data_len;
3385 
3386  id = p;
3387  id_len = -1;
3388  while (p < q) {
3389  if (*p == '\r' || *p == '\n') {
3390  id_len = p - id;
3391  if (*p == '\r')
3392  p++;
3393  break;
3394  }
3395  p++;
3396  }
3397 
3398  if (p >= q || *p != '\n')
3399  return AVERROR_INVALIDDATA;
3400  p++;
3401 
3402  settings = p;
3403  settings_len = -1;
3404  while (p < q) {
3405  if (*p == '\r' || *p == '\n') {
3406  settings_len = p - settings;
3407  if (*p == '\r')
3408  p++;
3409  break;
3410  }
3411  p++;
3412  }
3413 
3414  if (p >= q || *p != '\n')
3415  return AVERROR_INVALIDDATA;
3416  p++;
3417 
3418  text = p;
3419  text_len = q - p;
3420  while (text_len > 0) {
3421  const int len = text_len - 1;
3422  const uint8_t c = p[len];
3423  if (c != '\r' && c != '\n')
3424  break;
3425  text_len = len;
3426  }
3427 
3428  if (text_len <= 0)
3429  return AVERROR_INVALIDDATA;
3430 
3431  err = av_new_packet(pkt, text_len);
3432  if (err < 0) {
3433  return err;
3434  }
3435 
3436  memcpy(pkt->data, text, text_len);
3437 
3438  if (id_len > 0) {
3439  buf = av_packet_new_side_data(pkt,
3441  id_len);
3442  if (!buf) {
3443  av_packet_unref(pkt);
3444  return AVERROR(ENOMEM);
3445  }
3446  memcpy(buf, id, id_len);
3447  }
3448 
3449  if (settings_len > 0) {
3450  buf = av_packet_new_side_data(pkt,
3452  settings_len);
3453  if (!buf) {
3454  av_packet_unref(pkt);
3455  return AVERROR(ENOMEM);
3456  }
3457  memcpy(buf, settings, settings_len);
3458  }
3459 
3460  // Do we need this for subtitles?
3461  // pkt->flags = AV_PKT_FLAG_KEY;
3462 
3463  pkt->stream_index = st->index;
3464  pkt->pts = timecode;
3465 
3466  // Do we need this for subtitles?
3467  // pkt->dts = timecode;
3468 
3469  pkt->duration = duration;
3470  pkt->pos = pos;
3471 
3472  err = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3473  if (err < 0) {
3474  av_packet_unref(pkt);
3475  return AVERROR(ENOMEM);
3476  }
3477 
3478  return 0;
3479 }
3480 
3482  MatroskaTrack *track, AVStream *st,
3483  AVBufferRef *buf, uint8_t *data, int pkt_size,
3484  uint64_t timecode, uint64_t lace_duration,
3485  int64_t pos, int is_keyframe,
3486  uint8_t *additional, uint64_t additional_id, int additional_size,
3487  int64_t discard_padding)
3488 {
3489  uint8_t *pkt_data = data;
3490  int res = 0;
3491  AVPacket pktl, *pkt = &pktl;
3492 
3493  if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3494  res = matroska_parse_wavpack(track, &pkt_data, &pkt_size);
3495  if (res < 0) {
3496  av_log(matroska->ctx, AV_LOG_ERROR,
3497  "Error parsing a wavpack block.\n");
3498  goto fail;
3499  }
3500  if (!buf)
3501  av_freep(&data);
3502  buf = NULL;
3503  }
3504 
3505  if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3506  AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3507  res = matroska_parse_prores(track, &pkt_data, &pkt_size);
3508  if (res < 0) {
3509  av_log(matroska->ctx, AV_LOG_ERROR,
3510  "Error parsing a prores block.\n");
3511  goto fail;
3512  }
3513  if (!buf)
3514  av_freep(&data);
3515  buf = NULL;
3516  }
3517 
3518  if (!pkt_size && !additional_size)
3519  goto no_output;
3520 
3521  av_init_packet(pkt);
3522  if (!buf)
3523  pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3524  NULL, NULL, 0);
3525  else
3526  pkt->buf = av_buffer_ref(buf);
3527 
3528  if (!pkt->buf) {
3529  res = AVERROR(ENOMEM);
3530  goto fail;
3531  }
3532 
3533  pkt->data = pkt_data;
3534  pkt->size = pkt_size;
3535  pkt->flags = is_keyframe;
3536  pkt->stream_index = st->index;
3537 
3538  if (additional_size > 0) {
3539  uint8_t *side_data = av_packet_new_side_data(pkt,
3541  additional_size + 8);
3542  if (!side_data) {
3543  av_packet_unref(pkt);
3544  return AVERROR(ENOMEM);
3545  }
3546  AV_WB64(side_data, additional_id);
3547  memcpy(side_data + 8, additional, additional_size);
3548  }
3549 
3550  if (discard_padding) {
3551  uint8_t *side_data = av_packet_new_side_data(pkt,
3553  10);
3554  if (!side_data) {
3555  av_packet_unref(pkt);
3556  return AVERROR(ENOMEM);
3557  }
3558  discard_padding = av_rescale_q(discard_padding,
3559  (AVRational){1, 1000000000},
3560  (AVRational){1, st->codecpar->sample_rate});
3561  if (discard_padding > 0) {
3562  AV_WL32(side_data + 4, discard_padding);
3563  } else {
3564  AV_WL32(side_data, -discard_padding);
3565  }
3566  }
3567 
3568  if (track->ms_compat)
3569  pkt->dts = timecode;
3570  else
3571  pkt->pts = timecode;
3572  pkt->pos = pos;
3573  pkt->duration = lace_duration;
3574 
3575 #if FF_API_CONVERGENCE_DURATION
3577  if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3578  pkt->convergence_duration = lace_duration;
3579  }
3581 #endif
3582 
3583  res = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3584  if (res < 0) {
3585  av_packet_unref(pkt);
3586  return AVERROR(ENOMEM);
3587  }
3588 
3589  return 0;
3590 
3591 no_output:
3592 fail:
3593  if (!buf)
3594  av_free(pkt_data);
3595  return res;
3596 }
3597 
3599  int size, int64_t pos, uint64_t cluster_time,
3600  uint64_t block_duration, int is_keyframe,
3601  uint8_t *additional, uint64_t additional_id, int additional_size,
3602  int64_t cluster_pos, int64_t discard_padding)
3603 {
3604  uint64_t timecode = AV_NOPTS_VALUE;
3605  MatroskaTrack *track;
3606  AVIOContext pb;
3607  int res = 0;
3608  AVStream *st;
3609  int16_t block_time;
3610  uint32_t lace_size[256];
3611  int n, flags, laces = 0;
3612  uint64_t num;
3613  int trust_default_duration;
3614 
3615  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3616 
3617  if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3618  return n;
3619  data += n;
3620  size -= n;
3621 
3622  track = matroska_find_track_by_num(matroska, num);
3623  if (!track || size < 3)
3624  return AVERROR_INVALIDDATA;
3625 
3626  if (!(st = track->stream)) {
3627  av_log(matroska->ctx, AV_LOG_VERBOSE,
3628  "No stream associated to TrackNumber %"PRIu64". "
3629  "Ignoring Block with this TrackNumber.\n", num);
3630  return 0;
3631  }
3632 
3633  if (st->discard >= AVDISCARD_ALL)
3634  return res;
3635  if (block_duration > INT64_MAX)
3636  block_duration = INT64_MAX;
3637 
3638  block_time = sign_extend(AV_RB16(data), 16);
3639  data += 2;
3640  flags = *data++;
3641  size -= 3;
3642  if (is_keyframe == -1)
3643  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3644 
3645  if (cluster_time != (uint64_t) -1 &&
3646  (block_time >= 0 || cluster_time >= -block_time)) {
3647  uint64_t timecode_cluster_in_track_tb = (double) cluster_time / track->time_scale;
3648  timecode = timecode_cluster_in_track_tb + block_time - track->codec_delay_in_track_tb;
3649  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3650  timecode < track->end_timecode)
3651  is_keyframe = 0; /* overlapping subtitles are not key frame */
3652  if (is_keyframe) {
3653  ff_reduce_index(matroska->ctx, st->index);
3654  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3656  }
3657  }
3658 
3659  if (matroska->skip_to_keyframe &&
3660  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3661  // Compare signed timecodes. Timecode may be negative due to codec delay
3662  // offset. We don't support timestamps greater than int64_t anyway - see
3663  // AVPacket's pts.
3664  if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3665  return res;
3666  if (is_keyframe)
3667  matroska->skip_to_keyframe = 0;
3668  else if (!st->internal->skip_to_keyframe) {
3669  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3670  matroska->skip_to_keyframe = 0;
3671  }
3672  }
3673 
3674  res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3675  &pb, lace_size, &laces);
3676  if (res < 0) {
3677  av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3678  return res;
3679  }
3680 
3681  trust_default_duration = track->default_duration != 0;
3682  if (track->audio.samplerate == 8000 && trust_default_duration) {
3683  // If this is needed for more codecs, then add them here
3684  if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3685  if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3686  trust_default_duration = 0;
3687  }
3688  }
3689 
3690  if (!block_duration && trust_default_duration)
3691  block_duration = track->default_duration * laces / matroska->time_scale;
3692 
3693  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3694  track->end_timecode =
3695  FFMAX(track->end_timecode, timecode + block_duration);
3696 
3697  for (n = 0; n < laces; n++) {
3698  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3699  uint8_t *out_data = data;
3700  int out_size = lace_size[n];
3701 
3702  if (track->needs_decoding) {
3703  res = matroska_decode_buffer(&out_data, &out_size, track);
3704  if (res < 0)
3705  return res;
3706  /* Given that we are here means that out_data is no longer
3707  * owned by buf, so set it to NULL. This depends upon
3708  * zero-length header removal compression being ignored. */
3709  av_assert1(out_data != data);
3710  buf = NULL;
3711  }
3712 
3713  if (track->audio.buf) {
3714  res = matroska_parse_rm_audio(matroska, track, st,
3715  out_data, out_size,
3716  timecode, pos);
3717  if (!buf)
3718  av_free(out_data);
3719  if (res)
3720  return res;
3721  } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3722  res = matroska_parse_webvtt(matroska, track, st,
3723  out_data, out_size,
3724  timecode, lace_duration,
3725  pos);
3726  if (!buf)
3727  av_free(out_data);
3728  if (res)
3729  return res;
3730  } else {
3731  res = matroska_parse_frame(matroska, track, st, buf, out_data,
3732  out_size, timecode, lace_duration,
3733  pos, !n ? is_keyframe : 0,
3734  additional, additional_id, additional_size,
3735  discard_padding);
3736  if (res)
3737  return res;
3738  }
3739 
3740  if (timecode != AV_NOPTS_VALUE)
3741  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3742  data += lace_size[n];
3743  }
3744 
3745  return 0;
3746 }
3747 
3749 {
3750  MatroskaCluster *cluster = &matroska->current_cluster;
3751  MatroskaBlock *block = &cluster->block;
3752  int res;
3753 
3754  av_assert0(matroska->num_levels <= 2);
3755 
3756  if (matroska->num_levels == 1) {
3757  res = ebml_parse(matroska, matroska_segment, NULL);
3758 
3759  if (res == 1) {
3760  /* Found a cluster: subtract the size of the ID already read. */
3761  cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3762 
3763  res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3764  if (res < 0)
3765  return res;
3766  }
3767  }
3768 
3769  if (matroska->num_levels == 2) {
3770  /* We are inside a cluster. */
3771  res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3772 
3773  if (res >= 0 && block->bin.size > 0) {
3774  int is_keyframe = block->non_simple ? block->reference.count == 0 : -1;
3775  uint8_t* additional = block->additional.size > 0 ?
3776  block->additional.data : NULL;
3777 
3778  res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3779  block->bin.size, block->bin.pos,
3780  cluster->timecode, block->duration,
3781  is_keyframe, additional, block->additional_id,
3782  block->additional.size, cluster->pos,
3783  block->discard_padding);
3784  }
3785 
3786  ebml_free(matroska_blockgroup, block);
3787  memset(block, 0, sizeof(*block));
3788  } else if (!matroska->num_levels) {
3789  if (!avio_feof(matroska->ctx->pb)) {
3790  avio_r8(matroska->ctx->pb);
3791  if (!avio_feof(matroska->ctx->pb)) {
3792  av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3793  "end of segment.\n");
3794  return AVERROR_INVALIDDATA;
3795  }
3796  }
3797  matroska->done = 1;
3798  return AVERROR_EOF;
3799  }
3800 
3801  return res;
3802 }
3803 
3805 {
3806  MatroskaDemuxContext *matroska = s->priv_data;
3807  int ret = 0;
3808 
3809  if (matroska->resync_pos == -1) {
3810  // This can only happen if generic seeking has been used.
3811  matroska->resync_pos = avio_tell(s->pb);
3812  }
3813 
3814  while (matroska_deliver_packet(matroska, pkt)) {
3815  if (matroska->done)
3816  return (ret < 0) ? ret : AVERROR_EOF;
3817  if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3818  ret = matroska_resync(matroska, matroska->resync_pos);
3819  }
3820 
3821  return 0;
3822 }
3823 
3824 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3825  int64_t timestamp, int flags)
3826 {
3827  MatroskaDemuxContext *matroska = s->priv_data;
3828  MatroskaTrack *tracks = NULL;
3829  AVStream *st = s->streams[stream_index];
3830  int i, index;
3831 
3832  /* Parse the CUES now since we need the index data to seek. */
3833  if (matroska->cues_parsing_deferred > 0) {
3834  matroska->cues_parsing_deferred = 0;
3835  matroska_parse_cues(matroska);
3836  }
3837 
3838  if (!st->internal->nb_index_entries)
3839  goto err;
3840  timestamp = FFMAX(timestamp, st->internal->index_entries[0].timestamp);
3841 
3842  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->internal->nb_index_entries - 1) {
3844  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->internal->nb_index_entries - 1) {
3845  matroska_clear_queue(matroska);
3846  if (matroska_parse_cluster(matroska) < 0)
3847  break;
3848  }
3849  }
3850 
3851  matroska_clear_queue(matroska);
3852  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->internal->nb_index_entries - 1))
3853  goto err;
3854 
3855  tracks = matroska->tracks.elem;
3856  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3857  tracks[i].audio.pkt_cnt = 0;
3858  tracks[i].audio.sub_packet_cnt = 0;
3859  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3860  tracks[i].end_timecode = 0;
3861  }
3862 
3863  /* We seek to a level 1 element, so set the appropriate status. */
3864  matroska_reset_status(matroska, 0, st->internal->index_entries[index].pos);
3865  if (flags & AVSEEK_FLAG_ANY) {
3866  st->internal->skip_to_keyframe = 0;
3867  matroska->skip_to_timecode = timestamp;
3868  } else {
3869  st->internal->skip_to_keyframe = 1;
3871  }
3872  matroska->skip_to_keyframe = 1;
3873  matroska->done = 0;
3874  ff_update_cur_dts(s, st, st->internal->index_entries[index].timestamp);
3875  return 0;
3876 err:
3877  // slightly hackish but allows proper fallback to
3878  // the generic seeking code.
3879  matroska_reset_status(matroska, 0, -1);
3880  matroska->resync_pos = -1;
3881  matroska_clear_queue(matroska);
3882  st->internal->skip_to_keyframe =
3883  matroska->skip_to_keyframe = 0;
3884  matroska->done = 0;
3885  return -1;
3886 }
3887 
3889 {
3890  MatroskaDemuxContext *matroska = s->priv_data;
3891  MatroskaTrack *tracks = matroska->tracks.elem;
3892  int n;
3893 
3894  matroska_clear_queue(matroska);
3895 
3896  for (n = 0; n < matroska->tracks.nb_elem; n++)
3897  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3898  av_freep(&tracks[n].audio.buf);
3899  ebml_free(matroska_segment, matroska);
3900 
3901  return 0;
3902 }
3903 
3904 typedef struct {
3905  int64_t start_time_ns;
3906  int64_t end_time_ns;
3907  int64_t start_offset;
3908  int64_t end_offset;
3909 } CueDesc;
3910 
3911 /* This function searches all the Cues and returns the CueDesc corresponding to
3912  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3913  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3914  */
3915 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3916  MatroskaDemuxContext *matroska = s->priv_data;
3917  CueDesc cue_desc;
3918  int i;
3919  int nb_index_entries = s->streams[0]->internal->nb_index_entries;
3920  AVIndexEntry *index_entries = s->streams[0]->internal->index_entries;
3921  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3922  for (i = 1; i < nb_index_entries; i++) {
3923  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3924  index_entries[i].timestamp * matroska->time_scale > ts) {
3925  break;
3926  }
3927  }
3928  --i;
3929  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3930  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3931  if (i != nb_index_entries - 1) {
3932  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3933  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3934  } else {
3935  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3936  // FIXME: this needs special handling for files where Cues appear
3937  // before Clusters. the current logic assumes Cues appear after
3938  // Clusters.
3939  cue_desc.end_offset = cues_start - matroska->segment_start;
3940  }
3941  return cue_desc;
3942 }
3943 
3945 {
3946  MatroskaDemuxContext *matroska = s->priv_data;
3947  uint32_t id = matroska->current_id;
3948  int64_t cluster_pos, before_pos;
3949  int index, rv = 1;
3950  if (s->streams[0]->internal->nb_index_entries <= 0) return 0;
3951  // seek to the first cluster using cues.
3952  index = av_index_search_timestamp(s->streams[0], 0, 0);
3953  if (index < 0) return 0;
3954  cluster_pos = s->streams[0]->internal->index_entries[index].pos;
3955  before_pos = avio_tell(s->pb);
3956  while (1) {
3957  uint64_t cluster_id, cluster_length;
3958  int read;
3959  AVPacket *pkt;
3960  avio_seek(s->pb, cluster_pos, SEEK_SET);
3961  // read cluster id and length
3962  read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3963  if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3964  break;
3965  read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3966  if (read < 0)
3967  break;
3968 
3969  matroska_reset_status(matroska, 0, cluster_pos);
3970  matroska_clear_queue(matroska);
3971  if (matroska_parse_cluster(matroska) < 0 ||
3972  !matroska->queue) {
3973  break;
3974  }
3975  pkt = &matroska->queue->pkt;
3976  // 4 + read is the length of the cluster id and the cluster length field.
3977  cluster_pos += 4 + read + cluster_length;
3978  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3979  rv = 0;
3980  break;
3981  }
3982  }
3983 
3984  /* Restore the status after matroska_read_header: */
3985  matroska_reset_status(matroska, id, before_pos);
3986 
3987  return rv;
3988 }
3989 
3990 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3991  double min_buffer, double* buffer,
3992  double* sec_to_download, AVFormatContext *s,
3993  int64_t cues_start)
3994 {
3995  double nano_seconds_per_second = 1000000000.0;
3996  double time_sec = time_ns / nano_seconds_per_second;
3997  int rv = 0;
3998  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3999  int64_t end_time_ns = time_ns + time_to_search_ns;
4000  double sec_downloaded = 0.0;
4001  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
4002  if (desc_curr.start_time_ns == -1)
4003  return -1;
4004  *sec_to_download = 0.0;
4005 
4006  // Check for non cue start time.
4007  if (time_ns > desc_curr.start_time_ns) {
4008  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
4009  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
4010  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
4011  double timeToDownload = (cueBytes * 8.0) / bps;
4012 
4013  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
4014  *sec_to_download += timeToDownload;
4015 
4016  // Check if the search ends within the first cue.
4017  if (desc_curr.end_time_ns >= end_time_ns) {
4018  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4019  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4020  sec_downloaded = percent_to_sub * sec_downloaded;
4021  *sec_to_download = percent_to_sub * *sec_to_download;
4022  }
4023 
4024  if ((sec_downloaded + *buffer) <= min_buffer) {
4025  return 1;
4026  }
4027 
4028  // Get the next Cue.
4029  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4030  }
4031 
4032  while (desc_curr.start_time_ns != -1) {
4033  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
4034  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
4035  double desc_sec = desc_ns / nano_seconds_per_second;
4036  double bits = (desc_bytes * 8.0);
4037  double time_to_download = bits / bps;
4038 
4039  sec_downloaded += desc_sec - time_to_download;
4040  *sec_to_download += time_to_download;
4041 
4042  if (desc_curr.end_time_ns >= end_time_ns) {
4043  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4044  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4045  sec_downloaded = percent_to_sub * sec_downloaded;
4046  *sec_to_download = percent_to_sub * *sec_to_download;
4047 
4048  if ((sec_downloaded + *buffer) <= min_buffer)
4049  rv = 1;
4050  break;
4051  }
4052 
4053  if ((sec_downloaded + *buffer) <= min_buffer) {
4054  rv = 1;
4055  break;
4056  }
4057 
4058  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4059  }
4060  *buffer = *buffer + sec_downloaded;
4061  return rv;
4062 }
4063 
4064 /* This function computes the bandwidth of the WebM file with the help of
4065  * buffer_size_after_time_downloaded() function. Both of these functions are
4066  * adapted from WebM Tools project and are adapted to work with FFmpeg's
4067  * Matroska parsing mechanism.
4068  *
4069  * Returns the bandwidth of the file on success; -1 on error.
4070  * */
4071 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
4072 {
4073  MatroskaDemuxContext *matroska = s->priv_data;
4074  AVStream *st = s->streams[0];
4075  double bandwidth = 0.0;
4076  int i;
4077 
4078  for (i = 0; i < st->internal->nb_index_entries; i++) {
4079  int64_t prebuffer_ns = 1000000000;
4080  int64_t time_ns = st->internal->index_entries[i].timestamp * matroska->time_scale;
4081  double nano_seconds_per_second = 1000000000.0;
4082  int64_t prebuffered_ns = time_ns + prebuffer_ns;
4083  double prebuffer_bytes = 0.0;
4084  int64_t temp_prebuffer_ns = prebuffer_ns;
4085  int64_t pre_bytes, pre_ns;
4086  double pre_sec, prebuffer, bits_per_second;
4087  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4088 
4089  // Start with the first Cue.
4090  CueDesc desc_end = desc_beg;
4091 
4092  // Figure out how much data we have downloaded for the prebuffer. This will
4093  // be used later to adjust the bits per sample to try.
4094  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4095  // Prebuffered the entire Cue.
4096  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4097  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4098  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4099  }
4100  if (desc_end.start_time_ns == -1) {
4101  // The prebuffer is larger than the duration.
4102  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4103  return -1;
4104  bits_per_second = 0.0;
4105  } else {
4106  // The prebuffer ends in the last Cue. Estimate how much data was
4107  // prebuffered.
4108  pre_bytes = desc_end.end_offset - desc_end.start_offset;
4109  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4110  pre_sec = pre_ns / nano_seconds_per_second;
4111  prebuffer_bytes +=
4112  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4113 
4114  prebuffer = prebuffer_ns / nano_seconds_per_second;
4115 
4116  // Set this to 0.0 in case our prebuffer buffers the entire video.
4117  bits_per_second = 0.0;
4118  do {
4119  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4120  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4121  double desc_sec = desc_ns / nano_seconds_per_second;
4122  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4123 
4124  // Drop the bps by the percentage of bytes buffered.
4125  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4126  double mod_bits_per_second = calc_bits_per_second * percent;
4127 
4128  if (prebuffer < desc_sec) {
4129  double search_sec =
4130  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4131 
4132  // Add 1 so the bits per second should be a little bit greater than file
4133  // datarate.
4134  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4135  const double min_buffer = 0.0;
4136  double buffer = prebuffer;
4137  double sec_to_download = 0.0;
4138 
4139  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4140  min_buffer, &buffer, &sec_to_download,
4141  s, cues_start);
4142  if (rv < 0) {
4143  return -1;
4144  } else if (rv == 0) {
4145  bits_per_second = (double)(bps);
4146  break;
4147  }
4148  }
4149 
4150  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4151  } while (desc_end.start_time_ns != -1);
4152  }
4153  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4154  }
4155  return (int64_t)bandwidth;
4156 }
4157 
4158 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4159 {
4160  MatroskaDemuxContext *matroska = s->priv_data;
4161  EbmlList *seekhead_list = &matroska->seekhead;
4162  MatroskaSeekhead *seekhead = seekhead_list->elem;
4163  char *buf;
4164  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4165  int i;
4166  int end = 0;
4167 
4168  // determine cues start and end positions
4169  for (i = 0; i < seekhead_list->nb_elem; i++)
4170  if (seekhead[i].id == MATROSKA_ID_CUES)
4171  break;
4172 
4173  if (i >= seekhead_list->nb_elem) return -1;
4174 
4175  before_pos = avio_tell(matroska->ctx->pb);
4176  cues_start = seekhead[i].pos + matroska->segment_start;
4177  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4178  // cues_end is computed as cues_start + cues_length + length of the
4179  // Cues element ID (i.e. 4) + EBML length of the Cues element.
4180  // cues_end is inclusive and the above sum is reduced by 1.
4181  uint64_t cues_length, cues_id;
4182  int bytes_read;
4183  bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4184  if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4185  return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4186  bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4187  if (bytes_read < 0)
4188  return bytes_read;
4189  cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4190  }
4191  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4192  if (cues_start == -1 || cues_end == -1) return -1;
4193 
4194  // parse the cues
4195  matroska_parse_cues(matroska);
4196 
4197  // cues start
4198  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4199 
4200  // cues end
4201  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4202 
4203  // if the file has cues at the start, fix up the init range so that
4204  // it does not include it
4205  if (cues_start <= init_range)
4206  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4207 
4208  // bandwidth
4209  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4210  if (bandwidth < 0) return -1;
4211  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4212 
4213  // check if all clusters start with key frames
4215 
4216  // store cue point timestamps as a comma separated list for checking subsegment alignment in
4217  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4218  buf = av_malloc_array(s->streams[0]->internal->nb_index_entries, 20);
4219  if (!buf) return -1;
4220  strcpy(buf, "");
4221  for (i = 0; i < s->streams[0]->internal->nb_index_entries; i++) {
4222  int ret = snprintf(buf + end, 20,
4223  "%" PRId64"%s", s->streams[0]->internal->index_entries[i].timestamp,
4224  i != s->streams[0]->internal->nb_index_entries - 1 ? "," : "");
4225  if (ret <= 0 || (ret == 20 && i == s->streams[0]->internal->nb_index_entries - 1)) {
4226  av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4227  av_free(buf);
4228  return AVERROR_INVALIDDATA;
4229  }
4230  end += ret;
4231  }
4234 
4235  return 0;
4236 }
4237 
4239 {
4240  char *buf;
4241  int ret = matroska_read_header(s);
4242  int64_t init_range;
4243  MatroskaTrack *tracks;
4244  MatroskaDemuxContext *matroska = s->priv_data;
4245  if (ret) {
4246  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4247  return -1;
4248  }
4249  if (!matroska->tracks.nb_elem || !s->nb_streams) {
4250  av_log(s, AV_LOG_ERROR, "No track found\n");
4251  ret = AVERROR_INVALIDDATA;
4252  goto fail;
4253  }
4254 
4255  if (!matroska->is_live) {
4256  buf = av_asprintf("%g", matroska->duration);
4257  if (!buf) {
4258  ret = AVERROR(ENOMEM);
4259  goto fail;
4260  }
4263 
4264  // initialization range
4265  // 5 is the offset of Cluster ID.
4266  init_range = avio_tell(s->pb) - 5;
4267  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4268  }
4269 
4270  // basename of the file
4271  buf = strrchr(s->url, '/');
4272  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4273 
4274  // track number
4275  tracks = matroska->tracks.elem;
4276  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4277 
4278  // parse the cues and populate Cue related fields
4279  if (!matroska->is_live) {
4280  ret = webm_dash_manifest_cues(s, init_range);
4281  if (ret < 0) {
4282  av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4283  goto fail;
4284  }
4285  }
4286 
4287  // use the bandwidth from the command line if it was provided
4288  if (matroska->bandwidth > 0) {
4290  matroska->bandwidth, 0);
4291  }
4292  return 0;
4293 fail:
4295  return ret;
4296 }
4297 
4299 {
4300  return AVERROR_EOF;
4301 }
4302 
4303 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4304 static const AVOption options[] = {
4305  { "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 },
4306  { "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 },
4307  { NULL },
4308 };
4309 
4310 static const AVClass webm_dash_class = {
4311  .class_name = "WebM DASH Manifest demuxer",
4312  .item_name = av_default_item_name,
4313  .option = options,
4314  .version = LIBAVUTIL_VERSION_INT,
4315 };
4316 
4318  .name = "matroska,webm",
4319  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4320  .extensions = "mkv,mk3d,mka,mks,webm",
4321  .priv_data_size = sizeof(MatroskaDemuxContext),
4327  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4328 };
4329 
4331  .name = "webm_dash_manifest",
4332  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4333  .priv_data_size = sizeof(MatroskaDemuxContext),
4337  .priv_class = &webm_dash_class,
4338 };
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:118
#define MATROSKA_ID_VIDEOPROJECTIONPOSEYAW
Definition: matroska.h:163
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:263
enum AVChromaLocation chroma_location
Definition: codec_par.h:150
#define AV_DISPOSITION_METADATA
Definition: avformat.h:866
#define NULL
Definition: coverity.c:32
MatroskaBlock block
Definition: matroskadec.c:346
static EbmlSyntax matroska_simpletag[]
Definition: matroskadec.c:673
#define MATROSKA_ID_BLOCKADDID
Definition: matroska.h:234
#define MATROSKA_ID_TRACKDEFAULTDURATION
Definition: matroska.h:108
enum AVFieldOrder field_order
Video only.
Definition: codec_par.h:141
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:3183
Bytestream IO Context.
Definition: avio.h:161
enum AVColorTransferCharacteristic color_trc
Definition: codec_par.h:148
#define MATROSKA_ID_VIDEOFLAGINTERLACED
Definition: matroska.h:125
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define MATROSKA_ID_VIDEOCOLOR_GX
Definition: matroska.h:151
uint64_t seek_preroll
Definition: matroskadec.c:257
const char *const ff_matroska_video_stereo_plane[MATROSKA_VIDEO_STEREO_PLANE_COUNT]
Definition: matroska.c:146
version
Definition: libkvazaar.c:320
static void matroska_convert_tags(AVFormatContext *s)
Definition: matroskadec.c:1799
#define MATROSKA_ID_DATEUTC
Definition: matroska.h:71
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
The optional first identifier line of a WebVTT cue.
Definition: packet.h:196
uint64_t type
Definition: matroskadec.c:244
unsigned MaxCLL
Max content light level (cd/m^2).
#define MATROSKA_ID_TRACKFLAGLACING
Definition: matroska.h:105
static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: matroskadec.c:4298
#define MATROSKA_ID_TRACKENTRY
Definition: matroska.h:75
static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
Definition: matroskadec.c:3055
static const CodecMime mkv_image_mime_tags[]
Definition: matroskadec.c:772
#define MATROSKA_ID_VIDEODISPLAYHEIGHT
Definition: matroska.h:117
uint64_t version
Definition: matroskadec.c:137
AVOption.
Definition: opt.h:248
static EbmlSyntax matroska_blockmore[]
Definition: matroskadec.c:731
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:134
AVInputFormat ff_matroska_demuxer
Definition: matroskadec.c:4317
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static int is_keyframe(NalUnitType naltype)
Definition: libx265.c:60
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:1991
AVPacketList * queue
Definition: matroskadec.c:384
#define MATROSKA_ID_VIDEOPROJECTIONPOSEROLL
Definition: matroska.h:165
#define MATROSKA_ID_CUETRACKPOSITION
Definition: matroska.h:196
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3108
#define MATROSKA_ID_CODECPRIVATE
Definition: matroska.h:89
#define MATROSKA_ID_TRACKFLAGVISUALIMPAIRED
Definition: matroska.h:102
const unsigned char ff_sipr_subpk_size[4]
Definition: rmsipr.c:25
#define MATROSKA_ID_TAGTARGETS_TYPE
Definition: matroska.h:214
uint64_t display_unit
Definition: matroskadec.c:206
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
static EbmlSyntax matroska_track_video[19]
Definition: matroskadec.c:415
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define INITIALIZATION_RANGE
Definition: matroska.h:374
unsigned char * buf_ptr
Current position in the buffer.
Definition: avio.h:228
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:383
static int webm_clusters_start_with_keyframe(AVFormatContext *s)
Definition: matroskadec.c:3944
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:4905
int64_t pos
Definition: avformat.h:813
#define MATROSKA_ID_ENCODINGTYPE
Definition: matroska.h:177
#define MATROSKA_ID_AUDIOBITDEPTH
Definition: matroska.h:171
uint64_t chapteruid
Definition: matroskadec.c:316
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2413
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:340
EbmlList tag
Definition: matroskadec.c:322
CountedElement reference
Definition: matroskadec.c:337
static int segment_start(AVFormatContext *s, int write_header)
Definition: segment.c:239
uint64_t uid
Definition: matroskadec.c:243
int64_t data_offset
offset of the first packet
Definition: internal.h:80
static EbmlSyntax matroska_segments[]
Definition: matroskadec.c:726
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
MatroskaCluster current_cluster
Definition: matroskadec.c:400
uint32_t fourcc
Definition: vaapi_decode.c:239
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: codec_par.h:60
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:946
#define MATROSKA_ID_TAGTARGETS_ATTACHUID
Definition: matroska.h:218
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:885
int size
Definition: packet.h:364
static EbmlSyntax matroska_track_video_projection[]
Definition: matroskadec.c:482
#define MATROSKA_ID_CLUSTERPOSITION
Definition: matroska.h:229
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define MATROSKA_ID_FILEDATA
Definition: matroska.h:250
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
MatroskaTrackVideoProjection projection
Definition: matroskadec.c:212
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1708
#define EBML_ID_DOCTYPEREADVERSION
Definition: matroska.h:42
#define MATROSKA_ID_BLOCKREFERENCE
Definition: matroska.h:241
uint64_t flag_forced
Definition: matroskadec.c:252
int av_log2(unsigned v)
Definition: intmath.c:26
uint64_t max_size
Definition: matroskadec.c:138
#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:217
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
GLint GLenum type
Definition: opengl_enc.c:104
#define AV_DISPOSITION_HEARING_IMPAIRED
stream for hearing impaired audiences
Definition: avformat.h:842
uint64_t flag_default
Definition: matroskadec.c:251
#define MATROSKA_ID_VIDEOCOLOR_RX
Definition: matroska.h:149
Video represents a sphere mapped on a flat surface using equirectangular projection.
Definition: spherical.h:56
#define MATROSKA_ID_VIDEOASPECTRATIO
Definition: matroska.h:129
int out_size
Definition: movenc.c:55
#define MATROSKA_ID_MUXINGAPP
Definition: matroska.h:70
#define MATROSKA_ID_AUDIOCHANNELS
Definition: matroska.h:172
char * name
Definition: matroskadec.c:305
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
int has_primaries
Flag indicating whether the display primaries (and white point) are set.
#define FF_ARRAY_ELEMS(a)
const char * key
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
static EbmlSyntax matroska_index[2]
Definition: matroskadec.c:415
discard all
Definition: avcodec.h:236
#define MATROSKA_ID_VIDEOPROJECTIONTYPE
Definition: matroska.h:161