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 const struct EbmlSyntax {
99  uint32_t id;
102  size_t data_offset;
103  union {
104  int64_t i;
105  uint64_t u;
106  double f;
107  const char *s;
108  const struct EbmlSyntax *n;
109  } def;
110 } EbmlSyntax;
111 
112 typedef struct EbmlList {
113  int nb_elem;
114  unsigned int alloc_elem_size;
115  void *elem;
116 } EbmlList;
117 
118 typedef struct EbmlBin {
119  int size;
122  int64_t pos;
123 } EbmlBin;
124 
125 typedef struct Ebml {
126  uint64_t version;
127  uint64_t max_size;
128  uint64_t id_length;
129  char *doctype;
130  uint64_t doctype_version;
131 } Ebml;
132 
133 typedef struct MatroskaTrackCompression {
134  uint64_t algo;
137 
138 typedef struct MatroskaTrackEncryption {
139  uint64_t algo;
142 
143 typedef struct MatroskaTrackEncoding {
144  uint64_t scope;
145  uint64_t type;
149 
150 typedef struct MatroskaMasteringMeta {
151  double r_x;
152  double r_y;
153  double g_x;
154  double g_y;
155  double b_x;
156  double b_y;
157  double white_x;
158  double white_y;
162 
163 typedef struct MatroskaTrackVideoColor {
166  uint64_t chroma_sub_horz;
167  uint64_t chroma_sub_vert;
168  uint64_t cb_sub_horz;
169  uint64_t cb_sub_vert;
172  uint64_t range;
174  uint64_t primaries;
175  uint64_t max_cll;
176  uint64_t max_fall;
179 
181  uint64_t type;
182  EbmlBin private;
183  double yaw;
184  double pitch;
185  double roll;
187 
188 typedef struct MatroskaTrackVideo {
189  double frame_rate;
190  uint64_t display_width;
191  uint64_t display_height;
192  uint64_t pixel_width;
193  uint64_t pixel_height;
195  uint64_t display_unit;
196  uint64_t interlaced;
197  uint64_t field_order;
198  uint64_t stereo_mode;
199  uint64_t alpha_mode;
203 
204 typedef struct MatroskaTrackAudio {
205  double samplerate;
207  uint64_t bitdepth;
208  uint64_t channels;
209 
210  /* real audio header (extracted from extradata) */
216  int pkt_cnt;
217  uint64_t buf_timecode;
220 
221 typedef struct MatroskaTrackPlane {
222  uint64_t uid;
223  uint64_t type;
225 
226 typedef struct MatroskaTrackOperation {
229 
230 typedef struct MatroskaTrack {
231  uint64_t num;
232  uint64_t uid;
233  uint64_t type;
234  char *name;
235  char *codec_id;
237  char *language;
238  double time_scale;
240  uint64_t flag_default;
241  uint64_t flag_forced;
242  uint64_t seek_preroll;
247  uint64_t codec_delay;
249 
251  int64_t end_timecode;
255 
256  uint32_t palette[AVPALETTE_COUNT];
258 } MatroskaTrack;
259 
260 typedef struct MatroskaAttachment {
261  uint64_t uid;
262  char *filename;
263  char *description;
264  char *mime;
266 
269 
270 typedef struct MatroskaChapter {
271  uint64_t start;
272  uint64_t end;
273  uint64_t uid;
274  char *title;
275 
278 
279 typedef struct MatroskaIndexPos {
280  uint64_t track;
281  uint64_t pos;
283 
284 typedef struct MatroskaIndex {
285  uint64_t time;
287 } MatroskaIndex;
288 
289 typedef struct MatroskaTag {
290  char *name;
291  char *string;
292  char *lang;
293  uint64_t def;
295 } MatroskaTag;
296 
297 typedef struct MatroskaTagTarget {
298  char *type;
299  uint64_t typevalue;
300  uint64_t trackuid;
301  uint64_t chapteruid;
302  uint64_t attachuid;
304 
305 typedef struct MatroskaTags {
308 } MatroskaTags;
309 
310 typedef struct MatroskaSeekhead {
311  uint64_t id;
312  uint64_t pos;
314 
315 typedef struct MatroskaLevel {
316  uint64_t start;
317  uint64_t length;
318 } MatroskaLevel;
319 
320 typedef struct MatroskaBlock {
321  uint64_t duration;
322  int64_t reference;
323  uint64_t non_simple;
325  uint64_t additional_id;
328 } MatroskaBlock;
329 
330 typedef struct MatroskaCluster {
332  uint64_t timecode;
333  int64_t pos;
335 
336 typedef struct MatroskaLevel1Element {
337  int64_t pos;
338  uint32_t id;
339  int parsed;
341 
342 typedef struct MatroskaDemuxContext {
343  const AVClass *class;
345 
346  /* EBML stuff */
349  uint32_t current_id;
350  int64_t resync_pos;
352 
353  uint64_t time_scale;
354  double duration;
355  char *title;
356  char *muxingapp;
364 
365  /* byte position of the segment inside the stream */
366  int64_t segment_start;
367 
368  /* the packet queue */
371 
372  int done;
373 
374  /* What to skip before effectively reading a packet. */
377 
378  /* File has a CUES element, but we defer parsing until it is needed. */
380 
381  /* Level1 elements and whether they were read yet */
382  MatroskaLevel1Element level1_elems[64];
384 
386 
387  /* WebM DASH Manifest live flag */
388  int is_live;
389 
390  /* Bandwidth value for WebM DASH Manifest */
393 
394 #define CHILD_OF(parent) { .def = { .n = parent } }
395 
396 // The following forward declarations need their size because
397 // a tentative definition with internal linkage must not be an
398 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
399 // Removing the sizes breaks MSVC.
406 
408  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
409  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
410  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
411  { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
412  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
414  { EBML_ID_DOCTYPEVERSION, EBML_NONE },
415  CHILD_OF(ebml_syntax)
416 };
417 
418 static EbmlSyntax ebml_syntax[] = {
419  { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
421  { 0 }
422 };
423 
425  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
427  { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
429  { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
430  { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
431  { MATROSKA_ID_SEGMENTUID, EBML_NONE },
432  CHILD_OF(matroska_segment)
433 };
434 
436  { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
437  { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
438  { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
439  { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
440  { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
441  { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
442  { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
443  { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
444  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
445  { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
446  CHILD_OF(matroska_track_video_color)
447 };
448 
449 static EbmlSyntax matroska_track_video_color[] = {
450  { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
451  { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
452  { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
453  { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
454  { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
455  { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
461  { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
462  { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
463  { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
464  CHILD_OF(matroska_track_video)
465 };
466 
473  CHILD_OF(matroska_track_video)
474 };
475 
476 static EbmlSyntax matroska_track_video[] = {
477  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
478  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
479  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
480  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
481  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
482  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
483  { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
484  { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
485  { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
487  { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
488  { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
489  { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
494  { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
495  CHILD_OF(matroska_track)
496 };
497 
499  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
500  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
501  { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
502  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
503  CHILD_OF(matroska_track)
504 };
505 
509  CHILD_OF(matroska_track_encoding)
510 };
511 
516  { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
517  { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
518  { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
519  { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
520  CHILD_OF(matroska_track_encoding)
521 };
522 static EbmlSyntax matroska_track_encoding[] = {
523  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
524  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
525  { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
526  { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
528  CHILD_OF(matroska_track_encodings)
529 };
530 
531 static EbmlSyntax matroska_track_encodings[] = {
532  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
533  CHILD_OF(matroska_track)
534 };
535 
539  CHILD_OF(matroska_track_combine_planes)
540 };
541 
542 static EbmlSyntax matroska_track_combine_planes[] = {
543  { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
544  CHILD_OF(matroska_track_operation)
545 };
546 
547 static EbmlSyntax matroska_track_operation[] = {
548  { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
549  CHILD_OF(matroska_track)
550 };
551 
552 static EbmlSyntax matroska_track[] = {
553  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
555  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
558  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
559  { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
560  { MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
561  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
562  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
563  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
564  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
565  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
566  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
567  { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
568  { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
569  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
570  { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
572  { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
573  { MATROSKA_ID_CODECNAME, EBML_NONE },
574  { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
575  { MATROSKA_ID_CODECINFOURL, EBML_NONE },
576  { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
577  { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
578  { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
579  CHILD_OF(matroska_tracks)
580 };
581 
582 static EbmlSyntax matroska_tracks[] = {
583  { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
584  CHILD_OF(matroska_segment)
585 };
586 
589  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
590  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
591  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
593  CHILD_OF(matroska_attachments)
594 };
595 
596 static EbmlSyntax matroska_attachments[] = {
597  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
598  CHILD_OF(matroska_segment)
599 };
600 
602  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
604  { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
605  CHILD_OF(matroska_chapter_entry)
606 };
607 
608 static EbmlSyntax matroska_chapter_entry[] = {
609  { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
612  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
614  { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
615  { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
616  { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
617  CHILD_OF(matroska_chapter)
618 };
619 
620 static EbmlSyntax matroska_chapter[] = {
621  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
623  { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
624  { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
625  { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
626  CHILD_OF(matroska_chapters)
627 };
628 
629 static EbmlSyntax matroska_chapters[] = {
630  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
631  CHILD_OF(matroska_segment)
632 };
633 
635  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
638  { MATROSKA_ID_CUEDURATION, EBML_NONE },
639  { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
640  CHILD_OF(matroska_index_entry)
641 };
642 
643 static EbmlSyntax matroska_index_entry[] = {
644  { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
645  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
646  CHILD_OF(matroska_index)
647 };
648 
649 static EbmlSyntax matroska_index[] = {
650  { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
651  CHILD_OF(matroska_segment)
652 };
653 
655  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
656  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
657  { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
658  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
660  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
661  CHILD_OF(matroska_tag)
662 };
663 
666  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
667  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
668  { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
669  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
670  CHILD_OF(matroska_tag)
671 };
672 
673 static EbmlSyntax matroska_tag[] = {
674  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
675  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
676  CHILD_OF(matroska_tags)
677 };
678 
679 static EbmlSyntax matroska_tags[] = {
680  { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
681  CHILD_OF(matroska_segment)
682 };
683 
685  { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
686  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
687  CHILD_OF(matroska_seekhead)
688 };
689 
690 static EbmlSyntax matroska_seekhead[] = {
691  { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
692  CHILD_OF(matroska_segment)
693 };
694 
695 static EbmlSyntax matroska_segment[] = {
697  { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
698  { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
699  { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
700  { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
701  { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
702  { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
703  { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
704  { 0 } /* We don't want to go back to level 0, so don't add the parent. */
705 };
706 
708  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
709  { 0 }
710 };
711 
713  { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
714  { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
715  CHILD_OF(matroska_blockadditions)
716 };
717 
718 static EbmlSyntax matroska_blockadditions[] = {
719  { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
720  CHILD_OF(matroska_blockgroup)
721 };
722 
723 static EbmlSyntax matroska_blockgroup[] = {
724  { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
725  { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
727  { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
728  { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
730  { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
731  CHILD_OF(matroska_cluster_parsing)
732 };
733 
734 // The following array contains SimpleBlock and BlockGroup twice
735 // in order to reuse the other values for matroska_cluster_enter.
736 static EbmlSyntax matroska_cluster_parsing[] = {
737  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
738  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
739  { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
741  { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
743  { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
744  CHILD_OF(matroska_segment)
745 };
746 
748  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
749  { 0 }
750 };
751 #undef CHILD_OF
752 
753 static const CodecMime mkv_image_mime_tags[] = {
754  {"image/gif" , AV_CODEC_ID_GIF},
755  {"image/jpeg" , AV_CODEC_ID_MJPEG},
756  {"image/png" , AV_CODEC_ID_PNG},
757  {"image/tiff" , AV_CODEC_ID_TIFF},
758 
759  {"" , AV_CODEC_ID_NONE}
760 };
761 
762 static const CodecMime mkv_mime_tags[] = {
763  {"text/plain" , AV_CODEC_ID_TEXT},
764  {"application/x-truetype-font", AV_CODEC_ID_TTF},
765  {"application/x-font" , AV_CODEC_ID_TTF},
766  {"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
767  {"binary" , AV_CODEC_ID_BIN_DATA},
768 
769  {"" , AV_CODEC_ID_NONE}
770 };
771 
772 static const char *const matroska_doctypes[] = { "matroska", "webm" };
773 
775 
776 /*
777  * This function prepares the status for parsing of level 1 elements.
778  */
780  uint32_t id, int64_t position)
781 {
782  if (position >= 0) {
783  int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
784  if (err < 0)
785  return err;
786  }
787 
788  matroska->current_id = id;
789  matroska->num_levels = 1;
790  matroska->unknown_count = 0;
791  matroska->resync_pos = avio_tell(matroska->ctx->pb);
792  if (id)
793  matroska->resync_pos -= (av_log2(id) + 7) / 8;
794 
795  return 0;
796 }
797 
798 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
799 {
800  AVIOContext *pb = matroska->ctx->pb;
801  uint32_t id;
802 
803  /* Try to seek to the last position to resync from. If this doesn't work,
804  * we resync from the earliest position available: The start of the buffer. */
805  if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
806  av_log(matroska->ctx, AV_LOG_WARNING,
807  "Seek to desired resync point failed. Seeking to "
808  "earliest point available instead.\n");
809  avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
810  last_pos + 1), SEEK_SET);
811  }
812 
813  id = avio_rb32(pb);
814 
815  // try to find a toplevel element
816  while (!avio_feof(pb)) {
817  if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
818  id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
820  id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
821  /* Prepare the context for parsing of a level 1 element. */
822  matroska_reset_status(matroska, id, -1);
823  /* Given that we are here means that an error has occurred,
824  * so treat the segment as unknown length in order not to
825  * discard valid data that happens to be beyond the designated
826  * end of the segment. */
827  matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
828  return 0;
829  }
830  id = (id << 8) | avio_r8(pb);
831  }
832 
833  matroska->done = 1;
834  return pb->error ? pb->error : AVERROR_EOF;
835 }
836 
837 /*
838  * Read: an "EBML number", which is defined as a variable-length
839  * array of bytes. The first byte indicates the length by giving a
840  * number of 0-bits followed by a one. The position of the first
841  * "one" bit inside the first byte indicates the length of this
842  * number.
843  * Returns: number of bytes read, < 0 on error
844  */
846  int max_size, uint64_t *number, int eof_forbidden)
847 {
848  int read, n = 1;
849  uint64_t total;
850  int64_t pos;
851 
852  /* The first byte tells us the length in bytes - except when it is zero. */
853  total = avio_r8(pb);
854  if (pb->eof_reached)
855  goto err;
856 
857  /* get the length of the EBML number */
858  read = 8 - ff_log2_tab[total];
859 
860  if (!total || read > max_size) {
861  pos = avio_tell(pb) - 1;
862  if (!total) {
863  av_log(matroska->ctx, AV_LOG_ERROR,
864  "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
865  "of an EBML number\n", pos, pos);
866  } else {
867  av_log(matroska->ctx, AV_LOG_ERROR,
868  "Length %d indicated by an EBML number's first byte 0x%02x "
869  "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
870  read, (uint8_t) total, pos, pos, max_size);
871  }
872  return AVERROR_INVALIDDATA;
873  }
874 
875  /* read out length */
876  total ^= 1 << ff_log2_tab[total];
877  while (n++ < read)
878  total = (total << 8) | avio_r8(pb);
879 
880  if (pb->eof_reached) {
881  eof_forbidden = 1;
882  goto err;
883  }
884 
885  *number = total;
886 
887  return read;
888 
889 err:
890  pos = avio_tell(pb);
891  if (pb->error) {
892  av_log(matroska->ctx, AV_LOG_ERROR,
893  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
894  pos, pos);
895  return pb->error;
896  }
897  if (eof_forbidden) {
898  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
899  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
900  return AVERROR(EIO);
901  }
902  return AVERROR_EOF;
903 }
904 
905 /**
906  * Read a EBML length value.
907  * This needs special handling for the "unknown length" case which has multiple
908  * encodings.
909  */
911  uint64_t *number)
912 {
913  int res = ebml_read_num(matroska, pb, 8, number, 1);
914  if (res > 0 && *number + 1 == 1ULL << (7 * res))
915  *number = EBML_UNKNOWN_LENGTH;
916  return res;
917 }
918 
919 /*
920  * Read the next element as an unsigned int.
921  * Returns NEEDS_CHECKING.
922  */
923 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
924 {
925  int n = 0;
926 
927  /* big-endian ordering; build up number */
928  *num = 0;
929  while (n++ < size)
930  *num = (*num << 8) | avio_r8(pb);
931 
932  return NEEDS_CHECKING;
933 }
934 
935 /*
936  * Read the next element as a signed int.
937  * Returns NEEDS_CHECKING.
938  */
939 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
940 {
941  int n = 1;
942 
943  if (size == 0) {
944  *num = 0;
945  } else {
946  *num = sign_extend(avio_r8(pb), 8);
947 
948  /* big-endian ordering; build up number */
949  while (n++ < size)
950  *num = ((uint64_t)*num << 8) | avio_r8(pb);
951  }
952 
953  return NEEDS_CHECKING;
954 }
955 
956 /*
957  * Read the next element as a float.
958  * Returns NEEDS_CHECKING or < 0 on obvious failure.
959  */
960 static int ebml_read_float(AVIOContext *pb, int size, double *num)
961 {
962  if (size == 0)
963  *num = 0;
964  else if (size == 4)
965  *num = av_int2float(avio_rb32(pb));
966  else if (size == 8)
967  *num = av_int2double(avio_rb64(pb));
968  else
969  return AVERROR_INVALIDDATA;
970 
971  return NEEDS_CHECKING;
972 }
973 
974 /*
975  * Read the next element as an ASCII string.
976  * 0 is success, < 0 or NEEDS_CHECKING is failure.
977  */
978 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
979 {
980  char *res;
981  int ret;
982 
983  /* EBML strings are usually not 0-terminated, so we allocate one
984  * byte more, read the string and NULL-terminate it ourselves. */
985  if (!(res = av_malloc(size + 1)))
986  return AVERROR(ENOMEM);
987  if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
988  av_free(res);
989  return ret < 0 ? ret : NEEDS_CHECKING;
990  }
991  (res)[size] = '\0';
992  av_free(*str);
993  *str = res;
994 
995  return 0;
996 }
997 
998 /*
999  * Read the next element as binary data.
1000  * 0 is success, < 0 or NEEDS_CHECKING is failure.
1001  */
1003  int64_t pos, EbmlBin *bin)
1004 {
1005  int ret;
1006 
1007  ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
1008  if (ret < 0)
1009  return ret;
1010  memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1011 
1012  bin->data = bin->buf->data;
1013  bin->size = length;
1014  bin->pos = pos;
1015  if ((ret = avio_read(pb, bin->data, length)) != length) {
1016  av_buffer_unref(&bin->buf);
1017  bin->data = NULL;
1018  bin->size = 0;
1019  return ret < 0 ? ret : NEEDS_CHECKING;
1020  }
1021 
1022  return 0;
1023 }
1024 
1025 /*
1026  * Read the next element, but only the header. The contents
1027  * are supposed to be sub-elements which can be read separately.
1028  * 0 is success, < 0 is failure.
1029  */
1031  uint64_t length, int64_t pos)
1032 {
1034 
1035  if (matroska->num_levels >= EBML_MAX_DEPTH) {
1036  av_log(matroska->ctx, AV_LOG_ERROR,
1037  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1038  return AVERROR(ENOSYS);
1039  }
1040 
1041  level = &matroska->levels[matroska->num_levels++];
1042  level->start = pos;
1043  level->length = length;
1044 
1045  return 0;
1046 }
1047 
1048 /*
1049  * Read a signed "EBML number"
1050  * Return: number of bytes processed, < 0 on error
1051  */
1053  AVIOContext *pb, int64_t *num)
1054 {
1055  uint64_t unum;
1056  int res;
1057 
1058  /* read as unsigned number first */
1059  if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1060  return res;
1061 
1062  /* make signed (weird way) */
1063  *num = unum - ((1LL << (7 * res - 1)) - 1);
1064 
1065  return res;
1066 }
1067 
1068 static int ebml_parse(MatroskaDemuxContext *matroska,
1069  EbmlSyntax *syntax, void *data);
1070 
1071 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1072 {
1073  int i;
1074 
1075  // Whoever touches this should be aware of the duplication
1076  // existing in matroska_cluster_parsing.
1077  for (i = 0; syntax[i].id; i++)
1078  if (id == syntax[i].id)
1079  break;
1080 
1081  return &syntax[i];
1082 }
1083 
1084 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1085  void *data)
1086 {
1087  int res;
1088 
1089  if (data) {
1090  for (int i = 0; syntax[i].id; i++)
1091  switch (syntax[i].type) {
1092  case EBML_UINT:
1093  *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1094  break;
1095  case EBML_SINT:
1096  *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1097  break;
1098  case EBML_FLOAT:
1099  *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1100  break;
1101  case EBML_STR:
1102  case EBML_UTF8:
1103  // the default may be NULL
1104  if (syntax[i].def.s) {
1105  uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1106  *dst = av_strdup(syntax[i].def.s);
1107  if (!*dst)
1108  return AVERROR(ENOMEM);
1109  }
1110  break;
1111  }
1112 
1113  if (!matroska->levels[matroska->num_levels - 1].length) {
1114  matroska->num_levels--;
1115  return 0;
1116  }
1117  }
1118 
1119  do {
1120  res = ebml_parse(matroska, syntax, data);
1121  } while (!res);
1122 
1123  return res == LEVEL_ENDED ? 0 : res;
1124 }
1125 
1126 static int is_ebml_id_valid(uint32_t id)
1127 {
1128  // Due to endian nonsense in Matroska, the highest byte with any bits set
1129  // will contain the leading length bit. This bit in turn identifies the
1130  // total byte length of the element by its position within the byte.
1131  unsigned int bits = av_log2(id);
1132  return id && (bits + 7) / 8 == (8 - bits % 8);
1133 }
1134 
1135 /*
1136  * Allocate and return the entry for the level1 element with the given ID. If
1137  * an entry already exists, return the existing entry.
1138  */
1140  uint32_t id, int64_t pos)
1141 {
1142  int i;
1143  MatroskaLevel1Element *elem;
1144 
1145  if (!is_ebml_id_valid(id))
1146  return NULL;
1147 
1148  // Some files link to all clusters; useless.
1149  if (id == MATROSKA_ID_CLUSTER)
1150  return NULL;
1151 
1152  // There can be multiple SeekHeads and Tags.
1153  for (i = 0; i < matroska->num_level1_elems; i++) {
1154  if (matroska->level1_elems[i].id == id) {
1155  if (matroska->level1_elems[i].pos == pos ||
1156  id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
1157  return &matroska->level1_elems[i];
1158  }
1159  }
1160 
1161  // Only a completely broken file would have more elements.
1162  if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1163  av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
1164  return NULL;
1165  }
1166 
1167  elem = &matroska->level1_elems[matroska->num_level1_elems++];
1168  *elem = (MatroskaLevel1Element){.id = id};
1169 
1170  return elem;
1171 }
1172 
1173 static int ebml_parse(MatroskaDemuxContext *matroska,
1174  EbmlSyntax *syntax, void *data)
1175 {
1176  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1177  // Forbid unknown-length EBML_NONE elements.
1179  [EBML_UINT] = 8,
1180  [EBML_SINT] = 8,
1181  [EBML_FLOAT] = 8,
1182  // max. 16 MB for strings
1183  [EBML_STR] = 0x1000000,
1184  [EBML_UTF8] = 0x1000000,
1185  // max. 256 MB for binary data
1186  [EBML_BIN] = 0x10000000,
1187  // no limits for anything else
1188  };
1189  AVIOContext *pb = matroska->ctx->pb;
1190  uint32_t id;
1191  uint64_t length;
1192  int64_t pos = avio_tell(pb), pos_alt;
1193  int res, update_pos = 1, level_check;
1194  MatroskaLevel1Element *level1_elem;
1195  MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1196 
1197  if (!matroska->current_id) {
1198  uint64_t id;
1199  res = ebml_read_num(matroska, pb, 4, &id, 0);
1200  if (res < 0) {
1201  if (pb->eof_reached && res == AVERROR_EOF) {
1202  if (matroska->is_live)
1203  // in live mode, finish parsing if EOF is reached.
1204  return 1;
1205  if (level && pos == avio_tell(pb)) {
1206  if (level->length == EBML_UNKNOWN_LENGTH) {
1207  // Unknown-length levels automatically end at EOF.
1208  matroska->num_levels--;
1209  return LEVEL_ENDED;
1210  } else {
1211  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1212  "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1213  }
1214  }
1215  }
1216  return res;
1217  }
1218  matroska->current_id = id | 1 << 7 * res;
1219  pos_alt = pos + res;
1220  } else {
1221  pos_alt = pos;
1222  pos -= (av_log2(matroska->current_id) + 7) / 8;
1223  }
1224 
1225  id = matroska->current_id;
1226 
1227  syntax = ebml_parse_id(syntax, id);
1228  if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1229  if (level && level->length == EBML_UNKNOWN_LENGTH) {
1230  // Unknown-length levels end when an element from an upper level
1231  // in the hierarchy is encountered.
1232  while (syntax->def.n) {
1233  syntax = ebml_parse_id(syntax->def.n, id);
1234  if (syntax->id) {
1235  matroska->num_levels--;
1236  return LEVEL_ENDED;
1237  }
1238  };
1239  }
1240 
1241  av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1242  "%"PRId64"\n", id, pos);
1243  update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1244  }
1245 
1246  if (data) {
1247  data = (char *) data + syntax->data_offset;
1248  if (syntax->list_elem_size) {
1249  EbmlList *list = data;
1250  void *newelem;
1251 
1252  if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1253  return AVERROR(ENOMEM);
1254  newelem = av_fast_realloc(list->elem,
1255  &list->alloc_elem_size,
1256  (list->nb_elem + 1) * syntax->list_elem_size);
1257  if (!newelem)
1258  return AVERROR(ENOMEM);
1259  list->elem = newelem;
1260  data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1261  memset(data, 0, syntax->list_elem_size);
1262  list->nb_elem++;
1263  }
1264  }
1265 
1266  if (syntax->type != EBML_STOP) {
1267  matroska->current_id = 0;
1268  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1269  return res;
1270 
1271  pos_alt += res;
1272 
1273  if (matroska->num_levels > 0) {
1274  if (length != EBML_UNKNOWN_LENGTH &&
1275  level->length != EBML_UNKNOWN_LENGTH) {
1276  uint64_t elem_end = pos_alt + length,
1277  level_end = level->start + level->length;
1278 
1279  if (elem_end < level_end) {
1280  level_check = 0;
1281  } else if (elem_end == level_end) {
1282  level_check = LEVEL_ENDED;
1283  } else {
1284  av_log(matroska->ctx, AV_LOG_ERROR,
1285  "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1286  "containing master element ending at 0x%"PRIx64"\n",
1287  pos, elem_end, level_end);
1288  return AVERROR_INVALIDDATA;
1289  }
1290  } else if (length != EBML_UNKNOWN_LENGTH) {
1291  level_check = 0;
1292  } else if (level->length != EBML_UNKNOWN_LENGTH) {
1293  av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1294  "at 0x%"PRIx64" inside parent with finite size\n", pos);
1295  return AVERROR_INVALIDDATA;
1296  } else {
1297  level_check = 0;
1298  if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1299  || syntax->type == EBML_NEST)) {
1300  // According to the current specifications only clusters and
1301  // segments are allowed to be unknown-length. We also accept
1302  // other unknown-length master elements.
1303  av_log(matroska->ctx, AV_LOG_WARNING,
1304  "Found unknown-length element 0x%"PRIX32" other than "
1305  "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1306  "parsing will nevertheless be attempted.\n", id, pos);
1307  update_pos = -1;
1308  }
1309  }
1310  } else
1311  level_check = 0;
1312 
1313  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1314  if (length != EBML_UNKNOWN_LENGTH) {
1315  av_log(matroska->ctx, AV_LOG_ERROR,
1316  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1317  "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1318  length, max_lengths[syntax->type], id, pos);
1319  } else if (syntax->type != EBML_NONE) {
1320  av_log(matroska->ctx, AV_LOG_ERROR,
1321  "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1322  "unknown length, yet the length of an element of its "
1323  "type must be known.\n", id, pos);
1324  } else {
1325  av_log(matroska->ctx, AV_LOG_ERROR,
1326  "Found unknown-length element with ID 0x%"PRIX32" at "
1327  "pos. 0x%"PRIx64" for which no syntax for parsing is "
1328  "available.\n", id, pos);
1329  }
1330  return AVERROR_INVALIDDATA;
1331  }
1332 
1333  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1334  // Loosing sync will likely manifest itself as encountering unknown
1335  // elements which are not reliably distinguishable from elements
1336  // belonging to future extensions of the format.
1337  // We use a heuristic to detect such situations: If the current
1338  // element is not expected at the current syntax level and there
1339  // were only a few unknown elements in a row, then the element is
1340  // skipped or considered defective based upon the length of the
1341  // current element (i.e. how much would be skipped); if there were
1342  // more than a few skipped elements in a row and skipping the current
1343  // element would lead us more than SKIP_THRESHOLD away from the last
1344  // known good position, then it is inferred that an error occurred.
1345  // The dependency on the number of unknown elements in a row exists
1346  // because the distance to the last known good position is
1347  // automatically big if the last parsed element was big.
1348  // In both cases, each unknown element is considered equivalent to
1349  // UNKNOWN_EQUIV of skipped bytes for the check.
1350  // The whole check is only done for non-seekable output, because
1351  // in this situation skipped data can't simply be rechecked later.
1352  // This is especially important when using unkown length elements
1353  // as the check for whether a child exceeds its containing master
1354  // element is not effective in this situation.
1355  if (update_pos) {
1356  matroska->unknown_count = 0;
1357  } else {
1358  int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1359 
1360  if (matroska->unknown_count > 3)
1361  dist += pos_alt - matroska->resync_pos;
1362 
1363  if (dist > SKIP_THRESHOLD) {
1364  av_log(matroska->ctx, AV_LOG_ERROR,
1365  "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1366  "length 0x%"PRIx64" considered as invalid data. Last "
1367  "known good position 0x%"PRIx64", %d unknown elements"
1368  " in a row\n", id, pos, length, matroska->resync_pos,
1369  matroska->unknown_count);
1370  return AVERROR_INVALIDDATA;
1371  }
1372  }
1373  }
1374 
1375  if (update_pos > 0) {
1376  // We have found an element that is allowed at this place
1377  // in the hierarchy and it passed all checks, so treat the beginning
1378  // of the element as the "last known good" position.
1379  matroska->resync_pos = pos;
1380  }
1381 
1382  if (!data && length != EBML_UNKNOWN_LENGTH)
1383  goto skip;
1384  }
1385 
1386  switch (syntax->type) {
1387  case EBML_UINT:
1388  res = ebml_read_uint(pb, length, data);
1389  break;
1390  case EBML_SINT:
1391  res = ebml_read_sint(pb, length, data);
1392  break;
1393  case EBML_FLOAT:
1394  res = ebml_read_float(pb, length, data);
1395  break;
1396  case EBML_STR:
1397  case EBML_UTF8:
1398  res = ebml_read_ascii(pb, length, data);
1399  break;
1400  case EBML_BIN:
1401  res = ebml_read_binary(pb, length, pos_alt, data);
1402  break;
1403  case EBML_LEVEL1:
1404  case EBML_NEST:
1405  if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1406  return res;
1407  if (id == MATROSKA_ID_SEGMENT)
1408  matroska->segment_start = pos_alt;
1409  if (id == MATROSKA_ID_CUES)
1410  matroska->cues_parsing_deferred = 0;
1411  if (syntax->type == EBML_LEVEL1 &&
1412  (level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
1413  if (!level1_elem->pos) {
1414  // Zero is not a valid position for a level 1 element.
1415  level1_elem->pos = pos;
1416  } else if (level1_elem->pos != pos)
1417  av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1418  level1_elem->parsed = 1;
1419  }
1420  if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1421  return res;
1422  break;
1423  case EBML_STOP:
1424  return 1;
1425  skip:
1426  default:
1427  if (length) {
1428  int64_t res2;
1429  if (ffio_limit(pb, length) != length) {
1430  // ffio_limit emits its own error message,
1431  // so we don't have to.
1432  return AVERROR(EIO);
1433  }
1434  if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1435  // avio_skip might take us past EOF. We check for this
1436  // by skipping only length - 1 bytes, reading a byte and
1437  // checking the error flags. This is done in order to check
1438  // that the element has been properly skipped even when
1439  // no filesize (that ffio_limit relies on) is available.
1440  avio_r8(pb);
1441  res = NEEDS_CHECKING;
1442  } else
1443  res = res2;
1444  } else
1445  res = 0;
1446  }
1447  if (res) {
1448  if (res == NEEDS_CHECKING) {
1449  if (pb->eof_reached) {
1450  if (pb->error)
1451  res = pb->error;
1452  else
1453  res = AVERROR_EOF;
1454  } else
1455  goto level_check;
1456  }
1457 
1458  if (res == AVERROR_INVALIDDATA)
1459  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1460  else if (res == AVERROR(EIO))
1461  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1462  else if (res == AVERROR_EOF) {
1463  av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1464  res = AVERROR(EIO);
1465  }
1466 
1467  return res;
1468  }
1469 
1470 level_check:
1471  if (level_check == LEVEL_ENDED && matroska->num_levels) {
1472  level = &matroska->levels[matroska->num_levels - 1];
1473  pos = avio_tell(pb);
1474 
1475  // Given that pos >= level->start no check for
1476  // level->length != EBML_UNKNOWN_LENGTH is necessary.
1477  while (matroska->num_levels && pos == level->start + level->length) {
1478  matroska->num_levels--;
1479  level--;
1480  }
1481  }
1482 
1483  return level_check;
1484 }
1485 
1486 static void ebml_free(EbmlSyntax *syntax, void *data)
1487 {
1488  int i, j;
1489  for (i = 0; syntax[i].id; i++) {
1490  void *data_off = (char *) data + syntax[i].data_offset;
1491  switch (syntax[i].type) {
1492  case EBML_STR:
1493  case EBML_UTF8:
1494  av_freep(data_off);
1495  break;
1496  case EBML_BIN:
1497  av_buffer_unref(&((EbmlBin *) data_off)->buf);
1498  break;
1499  case EBML_LEVEL1:
1500  case EBML_NEST:
1501  if (syntax[i].list_elem_size) {
1502  EbmlList *list = data_off;
1503  char *ptr = list->elem;
1504  for (j = 0; j < list->nb_elem;
1505  j++, ptr += syntax[i].list_elem_size)
1506  ebml_free(syntax[i].def.n, ptr);
1507  av_freep(&list->elem);
1508  list->nb_elem = 0;
1509  list->alloc_elem_size = 0;
1510  } else
1511  ebml_free(syntax[i].def.n, data_off);
1512  default:
1513  break;
1514  }
1515  }
1516 }
1517 
1518 /*
1519  * Autodetecting...
1520  */
1521 static int matroska_probe(const AVProbeData *p)
1522 {
1523  uint64_t total = 0;
1524  int len_mask = 0x80, size = 1, n = 1, i;
1525 
1526  /* EBML header? */
1527  if (AV_RB32(p->buf) != EBML_ID_HEADER)
1528  return 0;
1529 
1530  /* length of header */
1531  total = p->buf[4];
1532  while (size <= 8 && !(total & len_mask)) {
1533  size++;
1534  len_mask >>= 1;
1535  }
1536  if (size > 8)
1537  return 0;
1538  total &= (len_mask - 1);
1539  while (n < size)
1540  total = (total << 8) | p->buf[4 + n++];
1541 
1542  if (total + 1 == 1ULL << (7 * size)){
1543  /* Unknown-length header - simply parse the whole buffer. */
1544  total = p->buf_size - 4 - size;
1545  } else {
1546  /* Does the probe data contain the whole header? */
1547  if (p->buf_size < 4 + size + total)
1548  return 0;
1549  }
1550 
1551  /* The header should contain a known document type. For now,
1552  * we don't parse the whole header but simply check for the
1553  * availability of that array of characters inside the header.
1554  * Not fully fool-proof, but good enough. */
1555  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1556  size_t probelen = strlen(matroska_doctypes[i]);
1557  if (total < probelen)
1558  continue;
1559  for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1560  if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1561  return AVPROBE_SCORE_MAX;
1562  }
1563 
1564  // probably valid EBML header but no recognized doctype
1565  return AVPROBE_SCORE_EXTENSION;
1566 }
1567 
1569  uint64_t num)
1570 {
1571  MatroskaTrack *tracks = matroska->tracks.elem;
1572  int i;
1573 
1574  for (i = 0; i < matroska->tracks.nb_elem; i++)
1575  if (tracks[i].num == num)
1576  return &tracks[i];
1577 
1578  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %"PRIu64"\n", num);
1579  return NULL;
1580 }
1581 
1582 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1583  MatroskaTrack *track)
1584 {
1585  MatroskaTrackEncoding *encodings = track->encodings.elem;
1586  uint8_t *data = *buf;
1587  int isize = *buf_size;
1588  uint8_t *pkt_data = NULL;
1589  uint8_t av_unused *newpktdata;
1590  int pkt_size = isize;
1591  int result = 0;
1592  int olen;
1593 
1594  if (pkt_size >= 10000000U)
1595  return AVERROR_INVALIDDATA;
1596 
1597  switch (encodings[0].compression.algo) {
1599  {
1600  int header_size = encodings[0].compression.settings.size;
1601  uint8_t *header = encodings[0].compression.settings.data;
1602 
1603  if (header_size && !header) {
1604  av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1605  return -1;
1606  }
1607 
1608  if (!header_size)
1609  return 0;
1610 
1611  pkt_size = isize + header_size;
1612  pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1613  if (!pkt_data)
1614  return AVERROR(ENOMEM);
1615 
1616  memcpy(pkt_data, header, header_size);
1617  memcpy(pkt_data + header_size, data, isize);
1618  break;
1619  }
1620 #if CONFIG_LZO
1622  do {
1623  int insize = isize;
1624  olen = pkt_size *= 3;
1625  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1627  if (!newpktdata) {
1628  result = AVERROR(ENOMEM);
1629  goto failed;
1630  }
1631  pkt_data = newpktdata;
1632  result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1633  } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1634  if (result) {
1635  result = AVERROR_INVALIDDATA;
1636  goto failed;
1637  }
1638  pkt_size -= olen;
1639  break;
1640 #endif
1641 #if CONFIG_ZLIB
1643  {
1644  z_stream zstream = { 0 };
1645  if (inflateInit(&zstream) != Z_OK)
1646  return -1;
1647  zstream.next_in = data;
1648  zstream.avail_in = isize;
1649  do {
1650  pkt_size *= 3;
1651  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1652  if (!newpktdata) {
1653  inflateEnd(&zstream);
1654  result = AVERROR(ENOMEM);
1655  goto failed;
1656  }
1657  pkt_data = newpktdata;
1658  zstream.avail_out = pkt_size - zstream.total_out;
1659  zstream.next_out = pkt_data + zstream.total_out;
1660  result = inflate(&zstream, Z_NO_FLUSH);
1661  } while (result == Z_OK && pkt_size < 10000000);
1662  pkt_size = zstream.total_out;
1663  inflateEnd(&zstream);
1664  if (result != Z_STREAM_END) {
1665  if (result == Z_MEM_ERROR)
1666  result = AVERROR(ENOMEM);
1667  else
1668  result = AVERROR_INVALIDDATA;
1669  goto failed;
1670  }
1671  break;
1672  }
1673 #endif
1674 #if CONFIG_BZLIB
1676  {
1677  bz_stream bzstream = { 0 };
1678  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1679  return -1;
1680  bzstream.next_in = data;
1681  bzstream.avail_in = isize;
1682  do {
1683  pkt_size *= 3;
1684  newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1685  if (!newpktdata) {
1686  BZ2_bzDecompressEnd(&bzstream);
1687  result = AVERROR(ENOMEM);
1688  goto failed;
1689  }
1690  pkt_data = newpktdata;
1691  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1692  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1693  result = BZ2_bzDecompress(&bzstream);
1694  } while (result == BZ_OK && pkt_size < 10000000);
1695  pkt_size = bzstream.total_out_lo32;
1696  BZ2_bzDecompressEnd(&bzstream);
1697  if (result != BZ_STREAM_END) {
1698  if (result == BZ_MEM_ERROR)
1699  result = AVERROR(ENOMEM);
1700  else
1701  result = AVERROR_INVALIDDATA;
1702  goto failed;
1703  }
1704  break;
1705  }
1706 #endif
1707  default:
1708  return AVERROR_INVALIDDATA;
1709  }
1710 
1711  memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1712 
1713  *buf = pkt_data;
1714  *buf_size = pkt_size;
1715  return 0;
1716 
1717 failed:
1718  av_free(pkt_data);
1719  return result;
1720 }
1721 
1723  AVDictionary **metadata, char *prefix)
1724 {
1725  MatroskaTag *tags = list->elem;
1726  char key[1024];
1727  int i;
1728 
1729  for (i = 0; i < list->nb_elem; i++) {
1730  const char *lang = tags[i].lang &&
1731  strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1732 
1733  if (!tags[i].name) {
1734  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1735  continue;
1736  }
1737  if (prefix)
1738  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1739  else
1740  av_strlcpy(key, tags[i].name, sizeof(key));
1741  if (tags[i].def || !lang) {
1742  av_dict_set(metadata, key, tags[i].string, 0);
1743  if (tags[i].sub.nb_elem)
1744  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1745  }
1746  if (lang) {
1747  av_strlcat(key, "-", sizeof(key));
1748  av_strlcat(key, lang, sizeof(key));
1749  av_dict_set(metadata, key, tags[i].string, 0);
1750  if (tags[i].sub.nb_elem)
1751  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1752  }
1753  }
1755 }
1756 
1758 {
1759  MatroskaDemuxContext *matroska = s->priv_data;
1760  MatroskaTags *tags = matroska->tags.elem;
1761  int i, j;
1762 
1763  for (i = 0; i < matroska->tags.nb_elem; i++) {
1764  if (tags[i].target.attachuid) {
1765  MatroskaAttachment *attachment = matroska->attachments.elem;
1766  int found = 0;
1767  for (j = 0; j < matroska->attachments.nb_elem; j++) {
1768  if (attachment[j].uid == tags[i].target.attachuid &&
1769  attachment[j].stream) {
1770  matroska_convert_tag(s, &tags[i].tag,
1771  &attachment[j].stream->metadata, NULL);
1772  found = 1;
1773  }
1774  }
1775  if (!found) {
1777  "The tags at index %d refer to a "
1778  "non-existent attachment %"PRId64".\n",
1779  i, tags[i].target.attachuid);
1780  }
1781  } else if (tags[i].target.chapteruid) {
1782  MatroskaChapter *chapter = matroska->chapters.elem;
1783  int found = 0;
1784  for (j = 0; j < matroska->chapters.nb_elem; j++) {
1785  if (chapter[j].uid == tags[i].target.chapteruid &&
1786  chapter[j].chapter) {
1787  matroska_convert_tag(s, &tags[i].tag,
1788  &chapter[j].chapter->metadata, NULL);
1789  found = 1;
1790  }
1791  }
1792  if (!found) {
1794  "The tags at index %d refer to a non-existent chapter "
1795  "%"PRId64".\n",
1796  i, tags[i].target.chapteruid);
1797  }
1798  } else if (tags[i].target.trackuid) {
1799  MatroskaTrack *track = matroska->tracks.elem;
1800  int found = 0;
1801  for (j = 0; j < matroska->tracks.nb_elem; j++) {
1802  if (track[j].uid == tags[i].target.trackuid &&
1803  track[j].stream) {
1804  matroska_convert_tag(s, &tags[i].tag,
1805  &track[j].stream->metadata, NULL);
1806  found = 1;
1807  }
1808  }
1809  if (!found) {
1811  "The tags at index %d refer to a non-existent track "
1812  "%"PRId64".\n",
1813  i, tags[i].target.trackuid);
1814  }
1815  } else {
1816  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1817  tags[i].target.type);
1818  }
1819  }
1820 }
1821 
1823  int64_t pos)
1824 {
1825  uint32_t saved_id = matroska->current_id;
1826  int64_t before_pos = avio_tell(matroska->ctx->pb);
1827  int ret = 0;
1828 
1829  /* seek */
1830  if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1831  /* We don't want to lose our seekhead level, so we add
1832  * a dummy. This is a crude hack. */
1833  if (matroska->num_levels == EBML_MAX_DEPTH) {
1834  av_log(matroska->ctx, AV_LOG_INFO,
1835  "Max EBML element depth (%d) reached, "
1836  "cannot parse further.\n", EBML_MAX_DEPTH);
1837  ret = AVERROR_INVALIDDATA;
1838  } else {
1839  matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1840  matroska->num_levels++;
1841  matroska->current_id = 0;
1842 
1843  ret = ebml_parse(matroska, matroska_segment, matroska);
1844  if (ret == LEVEL_ENDED) {
1845  /* This can only happen if the seek brought us beyond EOF. */
1846  ret = AVERROR_EOF;
1847  }
1848  }
1849  }
1850  /* Seek back - notice that in all instances where this is used
1851  * it is safe to set the level to 1. */
1852  matroska_reset_status(matroska, saved_id, before_pos);
1853 
1854  return ret;
1855 }
1856 
1858 {
1859  EbmlList *seekhead_list = &matroska->seekhead;
1860  int i;
1861 
1862  // we should not do any seeking in the streaming case
1863  if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1864  return;
1865 
1866  for (i = 0; i < seekhead_list->nb_elem; i++) {
1867  MatroskaSeekhead *seekheads = seekhead_list->elem;
1868  uint32_t id = seekheads[i].id;
1869  int64_t pos = seekheads[i].pos + matroska->segment_start;
1870  MatroskaLevel1Element *elem;
1871 
1872  if (id != seekheads[i].id || pos < matroska->segment_start)
1873  continue;
1874 
1875  elem = matroska_find_level1_elem(matroska, id, pos);
1876  if (!elem || elem->parsed)
1877  continue;
1878 
1879  elem->pos = pos;
1880 
1881  // defer cues parsing until we actually need cue data.
1882  if (id == MATROSKA_ID_CUES)
1883  continue;
1884 
1885  if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1886  // mark index as broken
1887  matroska->cues_parsing_deferred = -1;
1888  break;
1889  }
1890 
1891  elem->parsed = 1;
1892  }
1893 }
1894 
1896 {
1897  EbmlList *index_list;
1899  uint64_t index_scale = 1;
1900  int i, j;
1901 
1902  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1903  return;
1904 
1905  index_list = &matroska->index;
1906  index = index_list->elem;
1907  if (index_list->nb_elem < 2)
1908  return;
1909  if (index[1].time > 1E14 / matroska->time_scale) {
1910  av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1911  return;
1912  }
1913  for (i = 0; i < index_list->nb_elem; i++) {
1914  EbmlList *pos_list = &index[i].pos;
1915  MatroskaIndexPos *pos = pos_list->elem;
1916  for (j = 0; j < pos_list->nb_elem; j++) {
1917  MatroskaTrack *track = matroska_find_track_by_num(matroska,
1918  pos[j].track);
1919  if (track && track->stream)
1920  av_add_index_entry(track->stream,
1921  pos[j].pos + matroska->segment_start,
1922  index[i].time / index_scale, 0, 0,
1924  }
1925  }
1926 }
1927 
1929  int i;
1930 
1931  if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1932  return;
1933 
1934  for (i = 0; i < matroska->num_level1_elems; i++) {
1935  MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1936  if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1937  if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1938  matroska->cues_parsing_deferred = -1;
1939  elem->parsed = 1;
1940  break;
1941  }
1942  }
1943 
1944  matroska_add_index_entries(matroska);
1945 }
1946 
1948 {
1949  static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1950  int profile;
1951 
1952  for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1953  if (strstr(codec_id, aac_profiles[profile]))
1954  break;
1955  return profile + 1;
1956 }
1957 
1958 static int matroska_aac_sri(int samplerate)
1959 {
1960  int sri;
1961 
1962  for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1963  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1964  break;
1965  return sri;
1966 }
1967 
1968 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1969 {
1970  /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1971  avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1972 }
1973 
1975  MatroskaTrack *track,
1976  int *offset)
1977 {
1978  AVStream *st = track->stream;
1979  uint8_t *p = track->codec_priv.data;
1980  int size = track->codec_priv.size;
1981 
1982  if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1983  av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1984  track->codec_priv.size = 0;
1985  return 0;
1986  }
1987  *offset = 8;
1988  track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1989 
1990  p += track->codec_priv.size;
1991  size -= track->codec_priv.size;
1992 
1993  /* parse the remaining metadata blocks if present */
1994  while (size >= 4) {
1995  int block_last, block_type, block_size;
1996 
1997  flac_parse_block_header(p, &block_last, &block_type, &block_size);
1998 
1999  p += 4;
2000  size -= 4;
2001  if (block_size > size)
2002  return 0;
2003 
2004  /* check for the channel mask */
2005  if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
2006  AVDictionary *dict = NULL;
2007  AVDictionaryEntry *chmask;
2008 
2009  ff_vorbis_comment(s, &dict, p, block_size, 0);
2010  chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
2011  if (chmask) {
2012  uint64_t mask = strtol(chmask->value, NULL, 0);
2013  if (!mask || mask & ~0x3ffffULL) {
2015  "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2016  } else
2017  st->codecpar->channel_layout = mask;
2018  }
2019  av_dict_free(&dict);
2020  }
2021 
2022  p += block_size;
2023  size -= block_size;
2024  }
2025 
2026  return 0;
2027 }
2028 
2029 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2030 {
2031  int minor, micro, bttb = 0;
2032 
2033  /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2034  * this function, and fixed in 57.52 */
2035  if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf57.%d.%d", &minor, &micro) == 2)
2036  bttb = (minor >= 36 && minor <= 51 && micro >= 100);
2037 
2038  switch (field_order) {
2040  return AV_FIELD_PROGRESSIVE;
2042  return AV_FIELD_UNKNOWN;
2044  return AV_FIELD_TT;
2046  return AV_FIELD_BB;
2048  return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2050  return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2051  default:
2052  return AV_FIELD_UNKNOWN;
2053  }
2054 }
2055 
2056 static void mkv_stereo_mode_display_mul(int stereo_mode,
2057  int *h_width, int *h_height)
2058 {
2059  switch (stereo_mode) {
2065  break;
2070  *h_width = 2;
2071  break;
2076  *h_height = 2;
2077  break;
2078  }
2079 }
2080 
2081 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2082  const MatroskaTrackVideoColor *color = track->video.color.elem;
2083  const MatroskaMasteringMeta *mastering_meta;
2084  int has_mastering_primaries, has_mastering_luminance;
2085 
2086  if (!track->video.color.nb_elem)
2087  return 0;
2088 
2089  mastering_meta = &color->mastering_meta;
2090  // Mastering primaries are CIE 1931 coords, and must be > 0.
2091  has_mastering_primaries =
2092  mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2093  mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2094  mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2095  mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2096  has_mastering_luminance = mastering_meta->max_luminance > 0;
2097 
2100  if (color->primaries != AVCOL_PRI_RESERVED &&
2101  color->primaries != AVCOL_PRI_RESERVED0)
2102  st->codecpar->color_primaries = color->primaries;
2106  if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2107  color->range <= AVCOL_RANGE_JPEG)
2108  st->codecpar->color_range = color->range;
2113  st->codecpar->chroma_location =
2115  (color->chroma_siting_vert - 1) << 7);
2116  }
2117  if (color->max_cll && color->max_fall) {
2118  size_t size = 0;
2119  int ret;
2121  if (!metadata)
2122  return AVERROR(ENOMEM);
2124  (uint8_t *)metadata, size);
2125  if (ret < 0) {
2126  av_freep(&metadata);
2127  return ret;
2128  }
2129  metadata->MaxCLL = color->max_cll;
2130  metadata->MaxFALL = color->max_fall;
2131  }
2132 
2133  if (has_mastering_primaries || has_mastering_luminance) {
2134  AVMasteringDisplayMetadata *metadata =
2137  sizeof(AVMasteringDisplayMetadata));
2138  if (!metadata) {
2139  return AVERROR(ENOMEM);
2140  }
2141  memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2142  if (has_mastering_primaries) {
2143  metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2144  metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2145  metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2146  metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2147  metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2148  metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2149  metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2150  metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2151  metadata->has_primaries = 1;
2152  }
2153  if (has_mastering_luminance) {
2154  metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2155  metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2156  metadata->has_luminance = 1;
2157  }
2158  }
2159  return 0;
2160 }
2161 
2163  void *logctx)
2164 {
2165  AVSphericalMapping *spherical;
2166  const MatroskaTrackVideoProjection *mkv_projection = &track->video.projection;
2167  const uint8_t *priv_data = mkv_projection->private.data;
2168  enum AVSphericalProjection projection;
2169  size_t spherical_size;
2170  uint32_t l = 0, t = 0, r = 0, b = 0;
2171  uint32_t padding = 0;
2172  int ret;
2173 
2174  if (mkv_projection->private.size && priv_data[0] != 0) {
2175  av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
2176  return 0;
2177  }
2178 
2179  switch (track->video.projection.type) {
2181  if (track->video.projection.private.size == 20) {
2182  t = AV_RB32(priv_data + 4);
2183  b = AV_RB32(priv_data + 8);
2184  l = AV_RB32(priv_data + 12);
2185  r = AV_RB32(priv_data + 16);
2186 
2187  if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2188  av_log(logctx, AV_LOG_ERROR,
2189  "Invalid bounding rectangle coordinates "
2190  "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2191  l, t, r, b);
2192  return AVERROR_INVALIDDATA;
2193  }
2194  } else if (track->video.projection.private.size != 0) {
2195  av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2196  return AVERROR_INVALIDDATA;
2197  }
2198 
2199  if (l || t || r || b)
2200  projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2201  else
2202  projection = AV_SPHERICAL_EQUIRECTANGULAR;
2203  break;
2205  if (track->video.projection.private.size < 4) {
2206  av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
2207  return AVERROR_INVALIDDATA;
2208  } else if (track->video.projection.private.size == 12) {
2209  uint32_t layout = AV_RB32(priv_data + 4);
2210  if (layout) {
2211  av_log(logctx, AV_LOG_WARNING,
2212  "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2213  return 0;
2214  }
2215  projection = AV_SPHERICAL_CUBEMAP;
2216  padding = AV_RB32(priv_data + 8);
2217  } else {
2218  av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2219  return AVERROR_INVALIDDATA;
2220  }
2221  break;
2223  /* No Spherical metadata */
2224  return 0;
2225  default:
2226  av_log(logctx, AV_LOG_WARNING,
2227  "Unknown spherical metadata type %"PRIu64"\n",
2228  track->video.projection.type);
2229  return 0;
2230  }
2231 
2232  spherical = av_spherical_alloc(&spherical_size);
2233  if (!spherical)
2234  return AVERROR(ENOMEM);
2235 
2236  spherical->projection = projection;
2237 
2238  spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2239  spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2240  spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2241 
2242  spherical->padding = padding;
2243 
2244  spherical->bound_left = l;
2245  spherical->bound_top = t;
2246  spherical->bound_right = r;
2247  spherical->bound_bottom = b;
2248 
2249  ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2250  spherical_size);
2251  if (ret < 0) {
2252  av_freep(&spherical);
2253  return ret;
2254  }
2255 
2256  return 0;
2257 }
2258 
2259 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2260 {
2261  const AVCodecTag *codec_tags;
2262 
2263  codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2265 
2266  /* Normalize noncompliant private data that starts with the fourcc
2267  * by expanding/shifting the data by 4 bytes and storing the data
2268  * size at the start. */
2269  if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2270  int ret = av_buffer_realloc(&track->codec_priv.buf,
2272  if (ret < 0)
2273  return ret;
2274 
2275  track->codec_priv.data = track->codec_priv.buf->data;
2276  memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2277  track->codec_priv.size += 4;
2278  AV_WB32(track->codec_priv.data, track->codec_priv.size);
2279  }
2280 
2281  *fourcc = AV_RL32(track->codec_priv.data + 4);
2282  *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2283 
2284  return 0;
2285 }
2286 
2288 {
2289  MatroskaDemuxContext *matroska = s->priv_data;
2290  MatroskaTrack *tracks = matroska->tracks.elem;
2291  AVStream *st;
2292  int i, j, ret;
2293  int k;
2294 
2295  for (i = 0; i < matroska->tracks.nb_elem; i++) {
2296  MatroskaTrack *track = &tracks[i];
2298  EbmlList *encodings_list = &track->encodings;
2299  MatroskaTrackEncoding *encodings = encodings_list->elem;
2300  uint8_t *extradata = NULL;
2301  int extradata_size = 0;
2302  int extradata_offset = 0;
2303  uint32_t fourcc = 0;
2304  AVIOContext b;
2305  char* key_id_base64 = NULL;
2306  int bit_depth = -1;
2307 
2308  /* Apply some sanity checks. */
2309  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2310  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2311  track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2312  track->type != MATROSKA_TRACK_TYPE_METADATA) {
2313  av_log(matroska->ctx, AV_LOG_INFO,
2314  "Unknown or unsupported track type %"PRIu64"\n",
2315  track->type);
2316  continue;
2317  }
2318  if (!track->codec_id)
2319  continue;
2320 
2321  if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2322  isnan(track->audio.samplerate)) {
2323  av_log(matroska->ctx, AV_LOG_WARNING,
2324  "Invalid sample rate %f, defaulting to 8000 instead.\n",
2325  track->audio.samplerate);
2326  track->audio.samplerate = 8000;
2327  }
2328 
2329  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2330  if (!track->default_duration && track->video.frame_rate > 0) {
2331  double default_duration = 1000000000 / track->video.frame_rate;
2332  if (default_duration > UINT64_MAX || default_duration < 0) {
2333  av_log(matroska->ctx, AV_LOG_WARNING,
2334  "Invalid frame rate %e. Cannot calculate default duration.\n",
2335  track->video.frame_rate);
2336  } else {
2337  track->default_duration = default_duration;
2338  }
2339  }
2340  if (track->video.display_width == -1)
2341  track->video.display_width = track->video.pixel_width;
2342  if (track->video.display_height == -1)
2343  track->video.display_height = track->video.pixel_height;
2344  if (track->video.color_space.size == 4)
2345  fourcc = AV_RL32(track->video.color_space.data);
2346  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2347  if (!track->audio.out_samplerate)
2348  track->audio.out_samplerate = track->audio.samplerate;
2349  }
2350  if (encodings_list->nb_elem > 1) {
2351  av_log(matroska->ctx, AV_LOG_ERROR,
2352  "Multiple combined encodings not supported");
2353  } else if (encodings_list->nb_elem == 1) {
2354  if (encodings[0].type) {
2355  if (encodings[0].encryption.key_id.size > 0) {
2356  /* Save the encryption key id to be stored later as a
2357  metadata tag. */
2358  const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2359  key_id_base64 = av_malloc(b64_size);
2360  if (key_id_base64 == NULL)
2361  return AVERROR(ENOMEM);
2362 
2363  av_base64_encode(key_id_base64, b64_size,
2364  encodings[0].encryption.key_id.data,
2365  encodings[0].encryption.key_id.size);
2366  } else {
2367  encodings[0].scope = 0;
2368  av_log(matroska->ctx, AV_LOG_ERROR,
2369  "Unsupported encoding type");
2370  }
2371  } else if (
2372 #if CONFIG_ZLIB
2373  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2374 #endif
2375 #if CONFIG_BZLIB
2377 #endif
2378 #if CONFIG_LZO
2380 #endif
2382  encodings[0].scope = 0;
2383  av_log(matroska->ctx, AV_LOG_ERROR,
2384  "Unsupported encoding type");
2385  } else if (track->codec_priv.size && encodings[0].scope & 2) {
2386  uint8_t *codec_priv = track->codec_priv.data;
2387  int ret = matroska_decode_buffer(&track->codec_priv.data,
2388  &track->codec_priv.size,
2389  track);
2390  if (ret < 0) {
2391  track->codec_priv.data = NULL;
2392  track->codec_priv.size = 0;
2393  av_log(matroska->ctx, AV_LOG_ERROR,
2394  "Failed to decode codec private data\n");
2395  }
2396 
2397  if (codec_priv != track->codec_priv.data) {
2398  av_buffer_unref(&track->codec_priv.buf);
2399  if (track->codec_priv.data) {
2400  track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2402  NULL, NULL, 0);
2403  if (!track->codec_priv.buf) {
2404  av_freep(&track->codec_priv.data);
2405  track->codec_priv.size = 0;
2406  return AVERROR(ENOMEM);
2407  }
2408  }
2409  }
2410  }
2411  }
2412  track->needs_decoding = encodings && !encodings[0].type &&
2413  encodings[0].scope & 1 &&
2414  (encodings[0].compression.algo !=
2416  encodings[0].compression.settings.size);
2417 
2418  for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2419  if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2420  strlen(ff_mkv_codec_tags[j].str))) {
2421  codec_id = ff_mkv_codec_tags[j].id;
2422  break;
2423  }
2424  }
2425 
2426  st = track->stream = avformat_new_stream(s, NULL);
2427  if (!st) {
2428  av_free(key_id_base64);
2429  return AVERROR(ENOMEM);
2430  }
2431 
2432  if (key_id_base64) {
2433  /* export encryption key id as base64 metadata tag */
2434  av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2436  }
2437 
2438  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2439  track->codec_priv.size >= 40 &&
2440  track->codec_priv.data) {
2441  track->ms_compat = 1;
2442  bit_depth = AV_RL16(track->codec_priv.data + 14);
2443  fourcc = AV_RL32(track->codec_priv.data + 16);
2445  fourcc);
2446  if (!codec_id)
2448  fourcc);
2449  extradata_offset = 40;
2450  } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2451  track->codec_priv.size >= 14 &&
2452  track->codec_priv.data) {
2453  int ret;
2454  ffio_init_context(&b, track->codec_priv.data,
2455  track->codec_priv.size,
2456  0, NULL, NULL, NULL, NULL);
2457  ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2458  if (ret < 0)
2459  return ret;
2460  codec_id = st->codecpar->codec_id;
2461  fourcc = st->codecpar->codec_tag;
2462  extradata_offset = FFMIN(track->codec_priv.size, 18);
2463  } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2464  /* Normally 36, but allow noncompliant private data */
2465  && (track->codec_priv.size >= 32)
2466  && (track->codec_priv.data)) {
2467  uint16_t sample_size;
2468  int ret = get_qt_codec(track, &fourcc, &codec_id);
2469  if (ret < 0)
2470  return ret;
2471  sample_size = AV_RB16(track->codec_priv.data + 26);
2472  if (fourcc == 0) {
2473  if (sample_size == 8) {
2474  fourcc = MKTAG('r','a','w',' ');
2475  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2476  } else if (sample_size == 16) {
2477  fourcc = MKTAG('t','w','o','s');
2478  codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2479  }
2480  }
2481  if ((fourcc == MKTAG('t','w','o','s') ||
2482  fourcc == MKTAG('s','o','w','t')) &&
2483  sample_size == 8)
2484  codec_id = AV_CODEC_ID_PCM_S8;
2485  } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2486  (track->codec_priv.size >= 21) &&
2487  (track->codec_priv.data)) {
2488  int ret = get_qt_codec(track, &fourcc, &codec_id);
2489  if (ret < 0)
2490  return ret;
2491  if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2492  fourcc = MKTAG('S','V','Q','3');
2493  codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2494  }
2495  if (codec_id == AV_CODEC_ID_NONE)
2496  av_log(matroska->ctx, AV_LOG_ERROR,
2497  "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2498  if (track->codec_priv.size >= 86) {
2499  bit_depth = AV_RB16(track->codec_priv.data + 82);
2500  ffio_init_context(&b, track->codec_priv.data,
2501  track->codec_priv.size,
2502  0, NULL, NULL, NULL, NULL);
2503  if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2504  bit_depth &= 0x1F;
2505  track->has_palette = 1;
2506  }
2507  }
2508  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2509  switch (track->audio.bitdepth) {
2510  case 8:
2511  codec_id = AV_CODEC_ID_PCM_U8;
2512  break;
2513  case 24:
2514  codec_id = AV_CODEC_ID_PCM_S24BE;
2515  break;
2516  case 32:
2517  codec_id = AV_CODEC_ID_PCM_S32BE;
2518  break;
2519  }
2520  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2521  switch (track->audio.bitdepth) {
2522  case 8:
2523  codec_id = AV_CODEC_ID_PCM_U8;
2524  break;
2525  case 24:
2526  codec_id = AV_CODEC_ID_PCM_S24LE;
2527  break;
2528  case 32:
2529  codec_id = AV_CODEC_ID_PCM_S32LE;
2530  break;
2531  }
2532  } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2533  track->audio.bitdepth == 64) {
2534  codec_id = AV_CODEC_ID_PCM_F64LE;
2535  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2536  int profile = matroska_aac_profile(track->codec_id);
2537  int sri = matroska_aac_sri(track->audio.samplerate);
2538  extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2539  if (!extradata)
2540  return AVERROR(ENOMEM);
2541  extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2542  extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2543  if (strstr(track->codec_id, "SBR")) {
2544  sri = matroska_aac_sri(track->audio.out_samplerate);
2545  extradata[2] = 0x56;
2546  extradata[3] = 0xE5;
2547  extradata[4] = 0x80 | (sri << 3);
2548  extradata_size = 5;
2549  } else
2550  extradata_size = 2;
2551  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2552  /* Only ALAC's magic cookie is stored in Matroska's track headers.
2553  * Create the "atom size", "tag", and "tag version" fields the
2554  * decoder expects manually. */
2555  extradata_size = 12 + track->codec_priv.size;
2556  extradata = av_mallocz(extradata_size +
2558  if (!extradata)
2559  return AVERROR(ENOMEM);
2560  AV_WB32(extradata, extradata_size);
2561  memcpy(&extradata[4], "alac", 4);
2562  AV_WB32(&extradata[8], 0);
2563  memcpy(&extradata[12], track->codec_priv.data,
2564  track->codec_priv.size);
2565  } else if (codec_id == AV_CODEC_ID_TTA) {
2566  uint8_t *ptr;
2567  if (track->audio.channels > UINT16_MAX ||
2568  track->audio.bitdepth > UINT16_MAX) {
2569  av_log(matroska->ctx, AV_LOG_WARNING,
2570  "Too large audio channel number %"PRIu64
2571  " or bitdepth %"PRIu64". Skipping track.\n",
2572  track->audio.channels, track->audio.bitdepth);
2573  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2574  return AVERROR_INVALIDDATA;
2575  else
2576  continue;
2577  }
2578  if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2579  return AVERROR_INVALIDDATA;
2580  extradata_size = 22;
2581  extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2582  if (!extradata)
2583  return AVERROR(ENOMEM);
2584  ptr = extradata;
2585  bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2586  bytestream_put_le16(&ptr, 1);
2587  bytestream_put_le16(&ptr, track->audio.channels);
2588  bytestream_put_le16(&ptr, track->audio.bitdepth);
2589  bytestream_put_le32(&ptr, track->audio.out_samplerate);
2590  bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2591  track->audio.out_samplerate,
2592  AV_TIME_BASE * 1000));
2593  } else if (codec_id == AV_CODEC_ID_RV10 ||
2594  codec_id == AV_CODEC_ID_RV20 ||
2595  codec_id == AV_CODEC_ID_RV30 ||
2596  codec_id == AV_CODEC_ID_RV40) {
2597  extradata_offset = 26;
2598  } else if (codec_id == AV_CODEC_ID_RA_144) {
2599  track->audio.out_samplerate = 8000;
2600  track->audio.channels = 1;
2601  } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2602  codec_id == AV_CODEC_ID_COOK ||
2603  codec_id == AV_CODEC_ID_ATRAC3 ||
2604  codec_id == AV_CODEC_ID_SIPR)
2605  && track->codec_priv.data) {
2606  int flavor;
2607 
2608  ffio_init_context(&b, track->codec_priv.data,
2609  track->codec_priv.size,
2610  0, NULL, NULL, NULL, NULL);
2611  avio_skip(&b, 22);
2612  flavor = avio_rb16(&b);
2613  track->audio.coded_framesize = avio_rb32(&b);
2614  avio_skip(&b, 12);
2615  track->audio.sub_packet_h = avio_rb16(&b);
2616  track->audio.frame_size = avio_rb16(&b);
2617  track->audio.sub_packet_size = avio_rb16(&b);
2618  if (track->audio.coded_framesize <= 0 ||
2619  track->audio.sub_packet_h <= 0 ||
2620  track->audio.frame_size <= 0)
2621  return AVERROR_INVALIDDATA;
2622 
2623  if (codec_id == AV_CODEC_ID_RA_288) {
2624  if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
2625  != (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
2626  return AVERROR_INVALIDDATA;
2627  st->codecpar->block_align = track->audio.coded_framesize;
2628  track->codec_priv.size = 0;
2629  } else {
2630  if (codec_id == AV_CODEC_ID_SIPR) {
2631  static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2632  if (flavor > 3)
2633  return AVERROR_INVALIDDATA;
2634  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2635  st->codecpar->bit_rate = sipr_bit_rate[flavor];
2636  } else if (track->audio.sub_packet_size <= 0 ||
2637  track->audio.frame_size % track->audio.sub_packet_size)
2638  return AVERROR_INVALIDDATA;
2639  st->codecpar->block_align = track->audio.sub_packet_size;
2640  extradata_offset = 78;
2641  }
2642  track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2643  track->audio.frame_size);
2644  if (!track->audio.buf)
2645  return AVERROR(ENOMEM);
2646  } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2647  ret = matroska_parse_flac(s, track, &extradata_offset);
2648  if (ret < 0)
2649  return ret;
2650  } else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
2651  av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
2652  "in absence of valid CodecPrivate.\n");
2653  extradata_size = 2;
2654  extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
2655  if (!extradata)
2656  return AVERROR(ENOMEM);
2657  AV_WL16(extradata, 0x410);
2658  } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2659  fourcc = AV_RL32(track->codec_priv.data);
2660  } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2661  /* we don't need any value stored in CodecPrivate.
2662  make sure that it's not exported as extradata. */
2663  track->codec_priv.size = 0;
2664  } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2665  /* For now, propagate only the OBUs, if any. Once libavcodec is
2666  updated to handle isobmff style extradata this can be removed. */
2667  extradata_offset = 4;
2668  }
2669  track->codec_priv.size -= extradata_offset;
2670 
2671  if (codec_id == AV_CODEC_ID_NONE)
2672  av_log(matroska->ctx, AV_LOG_INFO,
2673  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2674 
2675  if (track->time_scale < 0.01)
2676  track->time_scale = 1.0;
2677  avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2678  1000 * 1000 * 1000); /* 64 bit pts in ns */
2679 
2680  /* convert the delay from ns to the track timebase */
2682  (AVRational){ 1, 1000000000 },
2683  st->time_base);
2684 
2685  st->codecpar->codec_id = codec_id;
2686 
2687  if (strcmp(track->language, "und"))
2688  av_dict_set(&st->metadata, "language", track->language, 0);
2689  av_dict_set(&st->metadata, "title", track->name, 0);
2690 
2691  if (track->flag_default)
2693  if (track->flag_forced)
2695 
2696  if (!st->codecpar->extradata) {
2697  if (extradata) {
2698  st->codecpar->extradata = extradata;
2699  st->codecpar->extradata_size = extradata_size;
2700  } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2701  if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2702  return AVERROR(ENOMEM);
2703  memcpy(st->codecpar->extradata,
2704  track->codec_priv.data + extradata_offset,
2705  track->codec_priv.size);
2706  }
2707  }
2708 
2709  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2711  int display_width_mul = 1;
2712  int display_height_mul = 1;
2713 
2715  st->codecpar->codec_tag = fourcc;
2716  if (bit_depth >= 0)
2718  st->codecpar->width = track->video.pixel_width;
2719  st->codecpar->height = track->video.pixel_height;
2720 
2722  st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2725 
2727  mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2728 
2731  &st->sample_aspect_ratio.den,
2732  st->codecpar->height * track->video.display_width * display_width_mul,
2733  st->codecpar->width * track->video.display_height * display_height_mul,
2734  255);
2735  }
2736  if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2738 
2739  if (track->default_duration) {
2741  1000000000, track->default_duration, 30000);
2742 #if FF_API_R_FRAME_RATE
2743  if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2744  && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2745  st->r_frame_rate = st->avg_frame_rate;
2746 #endif
2747  }
2748 
2749  /* export stereo mode flag as metadata tag */
2751  av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2752 
2753  /* export alpha mode flag as metadata tag */
2754  if (track->video.alpha_mode)
2755  av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2756 
2757  /* if we have virtual track, mark the real tracks */
2758  for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2759  char buf[32];
2760  if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2761  continue;
2762  snprintf(buf, sizeof(buf), "%s_%d",
2763  ff_matroska_video_stereo_plane[planes[j].type], i);
2764  for (k=0; k < matroska->tracks.nb_elem; k++)
2765  if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2766  av_dict_set(&tracks[k].stream->metadata,
2767  "stereo_mode", buf, 0);
2768  break;
2769  }
2770  }
2771  // add stream level stereo3d side data if it is a supported format
2773  track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2774  int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2775  if (ret < 0)
2776  return ret;
2777  }
2778 
2779  ret = mkv_parse_video_color(st, track);
2780  if (ret < 0)
2781  return ret;
2782  ret = mkv_parse_video_projection(st, track, matroska->ctx);
2783  if (ret < 0)
2784  return ret;
2785  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2787  st->codecpar->codec_tag = fourcc;
2788  st->codecpar->sample_rate = track->audio.out_samplerate;
2789  st->codecpar->channels = track->audio.channels;
2790  if (!st->codecpar->bits_per_coded_sample)
2792  if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2793  st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2796  else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2798  if (track->codec_delay > 0) {
2800  (AVRational){1, 1000000000},
2801  (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2802  48000 : st->codecpar->sample_rate});
2803  }
2804  if (track->seek_preroll > 0) {
2806  (AVRational){1, 1000000000},
2807  (AVRational){1, st->codecpar->sample_rate});
2808  }
2809  } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2811 
2812  if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2814  } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2816  } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2818  }
2819  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2821  }
2822  }
2823 
2824  return 0;
2825 }
2826 
2828 {
2829  MatroskaDemuxContext *matroska = s->priv_data;
2830  EbmlList *attachments_list = &matroska->attachments;
2831  EbmlList *chapters_list = &matroska->chapters;
2832  MatroskaAttachment *attachments;
2833  MatroskaChapter *chapters;
2834  uint64_t max_start = 0;
2835  int64_t pos;
2836  Ebml ebml = { 0 };
2837  int i, j, res;
2838 
2839  matroska->ctx = s;
2840  matroska->cues_parsing_deferred = 1;
2841 
2842  /* First read the EBML header. */
2843  if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2844  av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2845  ebml_free(ebml_syntax, &ebml);
2846  return AVERROR_INVALIDDATA;
2847  }
2848  if (ebml.version > EBML_VERSION ||
2849  ebml.max_size > sizeof(uint64_t) ||
2850  ebml.id_length > sizeof(uint32_t) ||
2851  ebml.doctype_version > 3) {
2853  "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2854  ebml.version, ebml.doctype, ebml.doctype_version);
2855  ebml_free(ebml_syntax, &ebml);
2856  return AVERROR_PATCHWELCOME;
2857  } else if (ebml.doctype_version == 3) {
2858  av_log(matroska->ctx, AV_LOG_WARNING,
2859  "EBML header using unsupported features\n"
2860  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2861  ebml.version, ebml.doctype, ebml.doctype_version);
2862  }
2863  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2864  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2865  break;
2866  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2867  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2868  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2869  ebml_free(ebml_syntax, &ebml);
2870  return AVERROR_INVALIDDATA;
2871  }
2872  }
2873  ebml_free(ebml_syntax, &ebml);
2874 
2875  /* The next thing is a segment. */
2876  pos = avio_tell(matroska->ctx->pb);
2877  res = ebml_parse(matroska, matroska_segments, matroska);
2878  // Try resyncing until we find an EBML_STOP type element.
2879  while (res != 1) {
2880  res = matroska_resync(matroska, pos);
2881  if (res < 0)
2882  goto fail;
2883  pos = avio_tell(matroska->ctx->pb);
2884  res = ebml_parse(matroska, matroska_segment, matroska);
2885  }
2886  /* Set data_offset as it might be needed later by seek_frame_generic. */
2887  if (matroska->current_id == MATROSKA_ID_CLUSTER)
2888  s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2889  matroska_execute_seekhead(matroska);
2890 
2891  if (!matroska->time_scale)
2892  matroska->time_scale = 1000000;
2893  if (matroska->duration)
2894  matroska->ctx->duration = matroska->duration * matroska->time_scale *
2895  1000 / AV_TIME_BASE;
2896  av_dict_set(&s->metadata, "title", matroska->title, 0);
2897  av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2898 
2899  if (matroska->date_utc.size == 8)
2901 
2902  res = matroska_parse_tracks(s);
2903  if (res < 0)
2904  goto fail;
2905 
2906  attachments = attachments_list->elem;
2907  for (j = 0; j < attachments_list->nb_elem; j++) {
2908  if (!(attachments[j].filename && attachments[j].mime &&
2909  attachments[j].bin.data && attachments[j].bin.size > 0)) {
2910  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2911  } else {
2912  AVStream *st = avformat_new_stream(s, NULL);
2913  if (!st)
2914  break;
2915  av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2916  av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2917  if (attachments[j].description)
2918  av_dict_set(&st->metadata, "title", attachments[j].description, 0);
2920 
2921  for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2922  if (!strncmp(mkv_image_mime_tags[i].str, attachments[j].mime,
2923  strlen(mkv_image_mime_tags[i].str))) {
2924  st->codecpar->codec_id = mkv_image_mime_tags[i].id;
2925  break;
2926  }
2927  }
2928 
2929  attachments[j].stream = st;
2930 
2931  if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2932  AVPacket *pkt = &st->attached_pic;
2933 
2936 
2937  av_init_packet(pkt);
2938  pkt->buf = attachments[j].bin.buf;
2939  attachments[j].bin.buf = NULL;
2940  pkt->data = attachments[j].bin.data;
2941  pkt->size = attachments[j].bin.size;
2942  pkt->stream_index = st->index;
2943  pkt->flags |= AV_PKT_FLAG_KEY;
2944  } else {
2946  if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2947  break;
2948  memcpy(st->codecpar->extradata, attachments[j].bin.data,
2949  attachments[j].bin.size);
2950 
2951  for (i = 0; mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2952  if (!strncmp(mkv_mime_tags[i].str, attachments[j].mime,
2953  strlen(mkv_mime_tags[i].str))) {
2954  st->codecpar->codec_id = mkv_mime_tags[i].id;
2955  break;
2956  }
2957  }
2958  }
2959  }
2960  }
2961 
2962  chapters = chapters_list->elem;
2963  for (i = 0; i < chapters_list->nb_elem; i++)
2964  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2965  (max_start == 0 || chapters[i].start > max_start)) {
2966  chapters[i].chapter =
2967  avpriv_new_chapter(s, chapters[i].uid,
2968  (AVRational) { 1, 1000000000 },
2969  chapters[i].start, chapters[i].end,
2970  chapters[i].title);
2971  max_start = chapters[i].start;
2972  }
2973 
2974  matroska_add_index_entries(matroska);
2975 
2977 
2978  return 0;
2979 fail:
2981  return res;
2982 }
2983 
2984 /*
2985  * Put one packet in an application-supplied AVPacket struct.
2986  * Returns 0 on success or -1 on failure.
2987  */
2989  AVPacket *pkt)
2990 {
2991  if (matroska->queue) {
2992  MatroskaTrack *tracks = matroska->tracks.elem;
2993  MatroskaTrack *track;
2994 
2995  avpriv_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2996  track = &tracks[pkt->stream_index];
2997  if (track->has_palette) {
2999  if (!pal) {
3000  av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
3001  } else {
3002  memcpy(pal, track->palette, AVPALETTE_SIZE);
3003  }
3004  track->has_palette = 0;
3005  }
3006  return 0;
3007  }
3008 
3009  return -1;
3010 }
3011 
3012 /*
3013  * Free all packets in our internal queue.
3014  */
3016 {
3017  avpriv_packet_list_free(&matroska->queue, &matroska->queue_end);
3018 }
3019 
3021  int size, int type, AVIOContext *pb,
3022  uint32_t lace_size[256], int *laces)
3023 {
3024  int n;
3025  uint8_t *data = *buf;
3026 
3027  if (!type) {
3028  *laces = 1;
3029  lace_size[0] = size;
3030  return 0;
3031  }
3032 
3033  if (size <= 0)
3034  return AVERROR_INVALIDDATA;
3035 
3036  *laces = *data + 1;
3037  data += 1;
3038  size -= 1;
3039 
3040  switch (type) {
3041  case 0x1: /* Xiph lacing */
3042  {
3043  uint8_t temp;
3044  uint32_t total = 0;
3045  for (n = 0; n < *laces - 1; n++) {
3046  lace_size[n] = 0;
3047 
3048  do {
3049  if (size <= total)
3050  return AVERROR_INVALIDDATA;
3051  temp = *data;
3052  total += temp;
3053  lace_size[n] += temp;
3054  data += 1;
3055  size -= 1;
3056  } while (temp == 0xff);
3057  }
3058  if (size < total)
3059  return AVERROR_INVALIDDATA;
3060 
3061  lace_size[n] = size - total;
3062  break;
3063  }
3064 
3065  case 0x2: /* fixed-size lacing */
3066  if (size % (*laces))
3067  return AVERROR_INVALIDDATA;
3068  for (n = 0; n < *laces; n++)
3069  lace_size[n] = size / *laces;
3070  break;
3071 
3072  case 0x3: /* EBML lacing */
3073  {
3074  uint64_t num;
3075  uint64_t total;
3076  int offset;
3077 
3078  avio_skip(pb, 4);
3079 
3080  n = ebml_read_num(matroska, pb, 8, &num, 1);
3081  if (n < 0)
3082  return n;
3083  if (num > INT_MAX)
3084  return AVERROR_INVALIDDATA;
3085 
3086  total = lace_size[0] = num;
3087  offset = n;
3088  for (n = 1; n < *laces - 1; n++) {
3089  int64_t snum;
3090  int r;
3091  r = matroska_ebmlnum_sint(matroska, pb, &snum);
3092  if (r < 0)
3093  return r;
3094  if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3095  return AVERROR_INVALIDDATA;
3096 
3097  lace_size[n] = lace_size[n - 1] + snum;
3098  total += lace_size[n];
3099  offset += r;
3100  }
3101  data += offset;
3102  size -= offset;
3103  if (size < total)
3104  return AVERROR_INVALIDDATA;
3105 
3106  lace_size[*laces - 1] = size - total;
3107  break;
3108  }
3109  }
3110 
3111  *buf = data;
3112 
3113  return 0;
3114 }
3115 
3117  MatroskaTrack *track, AVStream *st,
3118  uint8_t *data, int size, uint64_t timecode,
3119  int64_t pos)
3120 {
3121  const int a = st->codecpar->block_align;
3122  const int sps = track->audio.sub_packet_size;
3123  const int cfs = track->audio.coded_framesize;
3124  const int h = track->audio.sub_packet_h;
3125  const int w = track->audio.frame_size;
3126  int y = track->audio.sub_packet_cnt;
3127  int x;
3128 
3129  if (!track->audio.pkt_cnt) {
3130  if (track->audio.sub_packet_cnt == 0)
3131  track->audio.buf_timecode = timecode;
3132  if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3133  if (size < cfs * h / 2) {
3134  av_log(matroska->ctx, AV_LOG_ERROR,
3135  "Corrupt int4 RM-style audio packet size\n");
3136  return AVERROR_INVALIDDATA;
3137  }
3138  for (x = 0; x < h / 2; x++)
3139  memcpy(track->audio.buf + x * 2 * w + y * cfs,
3140  data + x * cfs, cfs);
3141  } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3142  if (size < w) {
3143  av_log(matroska->ctx, AV_LOG_ERROR,
3144  "Corrupt sipr RM-style audio packet size\n");
3145  return AVERROR_INVALIDDATA;
3146  }
3147  memcpy(track->audio.buf + y * w, data, w);
3148  } else {
3149  if (size < w) {
3150  av_log(matroska->ctx, AV_LOG_ERROR,
3151  "Corrupt generic RM-style audio packet size\n");
3152  return AVERROR_INVALIDDATA;
3153  }
3154  for (x = 0; x < w / sps; x++)
3155  memcpy(track->audio.buf +
3156  sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3157  data + x * sps, sps);
3158  }
3159 
3160  if (++track->audio.sub_packet_cnt >= h) {
3161  if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3162  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3163  track->audio.sub_packet_cnt = 0;
3164  track->audio.pkt_cnt = h * w / a;
3165  }
3166  }
3167 
3168  while (track->audio.pkt_cnt) {
3169  int ret;
3170  AVPacket pktl, *pkt = &pktl;
3171 
3172  ret = av_new_packet(pkt, a);
3173  if (ret < 0) {
3174  return ret;
3175  }
3176  memcpy(pkt->data,
3177  track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3178  a);
3179  pkt->pts = track->audio.buf_timecode;
3181  pkt->pos = pos;
3182  pkt->stream_index = st->index;
3183  ret = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3184  if (ret < 0) {
3185  av_packet_unref(pkt);
3186  return AVERROR(ENOMEM);
3187  }
3188  }
3189 
3190  return 0;
3191 }
3192 
3193 /* reconstruct full wavpack blocks from mangled matroska ones */
3195  uint8_t **data, int *size)
3196 {
3197  uint8_t *dst = NULL;
3198  uint8_t *src = *data;
3199  int dstlen = 0;
3200  int srclen = *size;
3201  uint32_t samples;
3202  uint16_t ver;
3203  int ret, offset = 0;
3204 
3205  if (srclen < 12)
3206  return AVERROR_INVALIDDATA;
3207 
3208  av_assert1(track->stream->codecpar->extradata_size >= 2);
3209  ver = AV_RL16(track->stream->codecpar->extradata);
3210 
3211  samples = AV_RL32(src);
3212  src += 4;
3213  srclen -= 4;
3214 
3215  while (srclen >= 8) {
3216  int multiblock;
3217  uint32_t blocksize;
3218  uint8_t *tmp;
3219 
3220  uint32_t flags = AV_RL32(src);
3221  uint32_t crc = AV_RL32(src + 4);
3222  src += 8;
3223  srclen -= 8;
3224 
3225  multiblock = (flags & 0x1800) != 0x1800;
3226  if (multiblock) {
3227  if (srclen < 4) {
3228  ret = AVERROR_INVALIDDATA;
3229  goto fail;
3230  }
3231  blocksize = AV_RL32(src);
3232  src += 4;
3233  srclen -= 4;
3234  } else
3235  blocksize = srclen;
3236 
3237  if (blocksize > srclen) {
3238  ret = AVERROR_INVALIDDATA;
3239  goto fail;
3240  }
3241 
3242  tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3243  if (!tmp) {
3244  ret = AVERROR(ENOMEM);
3245  goto fail;
3246  }
3247  dst = tmp;
3248  dstlen += blocksize + 32;
3249 
3250  AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3251  AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3252  AV_WL16(dst + offset + 8, ver); // version
3253  AV_WL16(dst + offset + 10, 0); // track/index_no
3254  AV_WL32(dst + offset + 12, 0); // total samples
3255  AV_WL32(dst + offset + 16, 0); // block index
3256  AV_WL32(dst + offset + 20, samples); // number of samples
3257  AV_WL32(dst + offset + 24, flags); // flags
3258  AV_WL32(dst + offset + 28, crc); // crc
3259  memcpy(dst + offset + 32, src, blocksize); // block data
3260 
3261  src += blocksize;
3262  srclen -= blocksize;
3263  offset += blocksize + 32;
3264  }
3265 
3266  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3267 
3268  *data = dst;
3269  *size = dstlen;
3270 
3271  return 0;
3272 
3273 fail:
3274  av_freep(&dst);
3275  return ret;
3276 }
3277 
3279  uint8_t **data, int *size)
3280 {
3281  uint8_t *dst;
3282  int dstlen = *size + 8;
3283 
3284  dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3285  if (!dst)
3286  return AVERROR(ENOMEM);
3287 
3288  AV_WB32(dst, dstlen);
3289  AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3290  memcpy(dst + 8, *data, dstlen - 8);
3291  memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3292 
3293  *data = dst;
3294  *size = dstlen;
3295 
3296  return 0;
3297 }
3298 
3300  MatroskaTrack *track,
3301  AVStream *st,
3302  uint8_t *data, int data_len,
3303  uint64_t timecode,
3304  uint64_t duration,
3305  int64_t pos)
3306 {
3307  AVPacket pktl, *pkt = &pktl;
3308  uint8_t *id, *settings, *text, *buf;
3309  int id_len, settings_len, text_len;
3310  uint8_t *p, *q;
3311  int err;
3312 
3313  if (data_len <= 0)
3314  return AVERROR_INVALIDDATA;
3315 
3316  p = data;
3317  q = data + data_len;
3318 
3319  id = p;
3320  id_len = -1;
3321  while (p < q) {
3322  if (*p == '\r' || *p == '\n') {
3323  id_len = p - id;
3324  if (*p == '\r')
3325  p++;
3326  break;
3327  }
3328  p++;
3329  }
3330 
3331  if (p >= q || *p != '\n')
3332  return AVERROR_INVALIDDATA;
3333  p++;
3334 
3335  settings = p;
3336  settings_len = -1;
3337  while (p < q) {
3338  if (*p == '\r' || *p == '\n') {
3339  settings_len = p - settings;
3340  if (*p == '\r')
3341  p++;
3342  break;
3343  }
3344  p++;
3345  }
3346 
3347  if (p >= q || *p != '\n')
3348  return AVERROR_INVALIDDATA;
3349  p++;
3350 
3351  text = p;
3352  text_len = q - p;
3353  while (text_len > 0) {
3354  const int len = text_len - 1;
3355  const uint8_t c = p[len];
3356  if (c != '\r' && c != '\n')
3357  break;
3358  text_len = len;
3359  }
3360 
3361  if (text_len <= 0)
3362  return AVERROR_INVALIDDATA;
3363 
3364  err = av_new_packet(pkt, text_len);
3365  if (err < 0) {
3366  return err;
3367  }
3368 
3369  memcpy(pkt->data, text, text_len);
3370 
3371  if (id_len > 0) {
3372  buf = av_packet_new_side_data(pkt,
3374  id_len);
3375  if (!buf) {
3376  av_packet_unref(pkt);
3377  return AVERROR(ENOMEM);
3378  }
3379  memcpy(buf, id, id_len);
3380  }
3381 
3382  if (settings_len > 0) {
3383  buf = av_packet_new_side_data(pkt,
3385  settings_len);
3386  if (!buf) {
3387  av_packet_unref(pkt);
3388  return AVERROR(ENOMEM);
3389  }
3390  memcpy(buf, settings, settings_len);
3391  }
3392 
3393  // Do we need this for subtitles?
3394  // pkt->flags = AV_PKT_FLAG_KEY;
3395 
3396  pkt->stream_index = st->index;
3397  pkt->pts = timecode;
3398 
3399  // Do we need this for subtitles?
3400  // pkt->dts = timecode;
3401 
3402  pkt->duration = duration;
3403  pkt->pos = pos;
3404 
3405  err = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3406  if (err < 0) {
3407  av_packet_unref(pkt);
3408  return AVERROR(ENOMEM);
3409  }
3410 
3411  return 0;
3412 }
3413 
3415  MatroskaTrack *track, AVStream *st,
3416  AVBufferRef *buf, uint8_t *data, int pkt_size,
3417  uint64_t timecode, uint64_t lace_duration,
3418  int64_t pos, int is_keyframe,
3419  uint8_t *additional, uint64_t additional_id, int additional_size,
3420  int64_t discard_padding)
3421 {
3422  uint8_t *pkt_data = data;
3423  int res = 0;
3424  AVPacket pktl, *pkt = &pktl;
3425 
3426  if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3427  res = matroska_parse_wavpack(track, &pkt_data, &pkt_size);
3428  if (res < 0) {
3429  av_log(matroska->ctx, AV_LOG_ERROR,
3430  "Error parsing a wavpack block.\n");
3431  goto fail;
3432  }
3433  if (!buf)
3434  av_freep(&data);
3435  buf = NULL;
3436  }
3437 
3438  if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3439  AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3440  res = matroska_parse_prores(track, &pkt_data, &pkt_size);
3441  if (res < 0) {
3442  av_log(matroska->ctx, AV_LOG_ERROR,
3443  "Error parsing a prores block.\n");
3444  goto fail;
3445  }
3446  if (!buf)
3447  av_freep(&data);
3448  buf = NULL;
3449  }
3450 
3451  if (!pkt_size && !additional_size)
3452  goto no_output;
3453 
3454  av_init_packet(pkt);
3455  if (!buf)
3456  pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3457  NULL, NULL, 0);
3458  else
3459  pkt->buf = av_buffer_ref(buf);
3460 
3461  if (!pkt->buf) {
3462  res = AVERROR(ENOMEM);
3463  goto fail;
3464  }
3465 
3466  pkt->data = pkt_data;
3467  pkt->size = pkt_size;
3468  pkt->flags = is_keyframe;
3469  pkt->stream_index = st->index;
3470 
3471  if (additional_size > 0) {
3472  uint8_t *side_data = av_packet_new_side_data(pkt,
3474  additional_size + 8);
3475  if (!side_data) {
3476  av_packet_unref(pkt);
3477  return AVERROR(ENOMEM);
3478  }
3479  AV_WB64(side_data, additional_id);
3480  memcpy(side_data + 8, additional, additional_size);
3481  }
3482 
3483  if (discard_padding) {
3484  uint8_t *side_data = av_packet_new_side_data(pkt,
3486  10);
3487  if (!side_data) {
3488  av_packet_unref(pkt);
3489  return AVERROR(ENOMEM);
3490  }
3491  discard_padding = av_rescale_q(discard_padding,
3492  (AVRational){1, 1000000000},
3493  (AVRational){1, st->codecpar->sample_rate});
3494  if (discard_padding > 0) {
3495  AV_WL32(side_data + 4, discard_padding);
3496  } else {
3497  AV_WL32(side_data, -discard_padding);
3498  }
3499  }
3500 
3501  if (track->ms_compat)
3502  pkt->dts = timecode;
3503  else
3504  pkt->pts = timecode;
3505  pkt->pos = pos;
3506  pkt->duration = lace_duration;
3507 
3508 #if FF_API_CONVERGENCE_DURATION
3510  if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3511  pkt->convergence_duration = lace_duration;
3512  }
3514 #endif
3515 
3516  res = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3517  if (res < 0) {
3518  av_packet_unref(pkt);
3519  return AVERROR(ENOMEM);
3520  }
3521 
3522  return 0;
3523 
3524 no_output:
3525 fail:
3526  if (!buf)
3527  av_free(pkt_data);
3528  return res;
3529 }
3530 
3532  int size, int64_t pos, uint64_t cluster_time,
3533  uint64_t block_duration, int is_keyframe,
3534  uint8_t *additional, uint64_t additional_id, int additional_size,
3535  int64_t cluster_pos, int64_t discard_padding)
3536 {
3537  uint64_t timecode = AV_NOPTS_VALUE;
3538  MatroskaTrack *track;
3539  AVIOContext pb;
3540  int res = 0;
3541  AVStream *st;
3542  int16_t block_time;
3543  uint32_t lace_size[256];
3544  int n, flags, laces = 0;
3545  uint64_t num;
3546  int trust_default_duration = 1;
3547 
3548  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3549 
3550  if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3551  return n;
3552  data += n;
3553  size -= n;
3554 
3555  track = matroska_find_track_by_num(matroska, num);
3556  if (!track || size < 3)
3557  return AVERROR_INVALIDDATA;
3558 
3559  if (!(st = track->stream)) {
3560  av_log(matroska->ctx, AV_LOG_VERBOSE,
3561  "No stream associated to TrackNumber %"PRIu64". "
3562  "Ignoring Block with this TrackNumber.\n", num);
3563  return 0;
3564  }
3565 
3566  if (st->discard >= AVDISCARD_ALL)
3567  return res;
3568  if (block_duration > INT64_MAX)
3569  block_duration = INT64_MAX;
3570 
3571  block_time = sign_extend(AV_RB16(data), 16);
3572  data += 2;
3573  flags = *data++;
3574  size -= 3;
3575  if (is_keyframe == -1)
3576  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3577 
3578  if (cluster_time != (uint64_t) -1 &&
3579  (block_time >= 0 || cluster_time >= -block_time)) {
3580  timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3581  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3582  timecode < track->end_timecode)
3583  is_keyframe = 0; /* overlapping subtitles are not key frame */
3584  if (is_keyframe) {
3585  ff_reduce_index(matroska->ctx, st->index);
3586  av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3588  }
3589  }
3590 
3591  if (matroska->skip_to_keyframe &&
3592  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3593  // Compare signed timecodes. Timecode may be negative due to codec delay
3594  // offset. We don't support timestamps greater than int64_t anyway - see
3595  // AVPacket's pts.
3596  if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3597  return res;
3598  if (is_keyframe)
3599  matroska->skip_to_keyframe = 0;
3600  else if (!st->skip_to_keyframe) {
3601  av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3602  matroska->skip_to_keyframe = 0;
3603  }
3604  }
3605 
3606  res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3607  &pb, lace_size, &laces);
3608  if (res < 0) {
3609  av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3610  return res;
3611  }
3612 
3613  if (track->audio.samplerate == 8000) {
3614  // If this is needed for more codecs, then add them here
3615  if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3616  if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3617  trust_default_duration = 0;
3618  }
3619  }
3620 
3621  if (!block_duration && trust_default_duration)
3622  block_duration = track->default_duration * laces / matroska->time_scale;
3623 
3624  if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3625  track->end_timecode =
3626  FFMAX(track->end_timecode, timecode + block_duration);
3627 
3628  for (n = 0; n < laces; n++) {
3629  int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3630  uint8_t *out_data = data;
3631  int out_size = lace_size[n];
3632 
3633  if (track->needs_decoding) {
3634  res = matroska_decode_buffer(&out_data, &out_size, track);
3635  if (res < 0)
3636  return res;
3637  /* Given that we are here means that out_data is no longer
3638  * owned by buf, so set it to NULL. This depends upon
3639  * zero-length header removal compression being ignored. */
3640  av_assert1(out_data != data);
3641  buf = NULL;
3642  }
3643 
3644  if (track->audio.buf) {
3645  res = matroska_parse_rm_audio(matroska, track, st,
3646  out_data, out_size,
3647  timecode, pos);
3648  if (!buf)
3649  av_free(out_data);
3650  if (res)
3651  return res;
3652  } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3653  res = matroska_parse_webvtt(matroska, track, st,
3654  out_data, out_size,
3655  timecode, lace_duration,
3656  pos);
3657  if (!buf)
3658  av_free(out_data);
3659  if (res)
3660  return res;
3661  } else {
3662  res = matroska_parse_frame(matroska, track, st, buf, out_data,
3663  out_size, timecode, lace_duration,
3664  pos, !n ? is_keyframe : 0,
3665  additional, additional_id, additional_size,
3666  discard_padding);
3667  if (res)
3668  return res;
3669  }
3670 
3671  if (timecode != AV_NOPTS_VALUE)
3672  timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3673  data += lace_size[n];
3674  }
3675 
3676  return 0;
3677 }
3678 
3680 {
3681  MatroskaCluster *cluster = &matroska->current_cluster;
3682  MatroskaBlock *block = &cluster->block;
3683  int res;
3684 
3685  av_assert0(matroska->num_levels <= 2);
3686 
3687  if (matroska->num_levels == 1) {
3688  res = ebml_parse(matroska, matroska_segment, NULL);
3689 
3690  if (res == 1) {
3691  /* Found a cluster: subtract the size of the ID already read. */
3692  cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3693 
3694  res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3695  if (res < 0)
3696  return res;
3697  }
3698  }
3699 
3700  if (matroska->num_levels == 2) {
3701  /* We are inside a cluster. */
3702  res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3703 
3704  if (res >= 0 && block->bin.size > 0) {
3705  int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3706  uint8_t* additional = block->additional.size > 0 ?
3707  block->additional.data : NULL;
3708 
3709  res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3710  block->bin.size, block->bin.pos,
3711  cluster->timecode, block->duration,
3712  is_keyframe, additional, block->additional_id,
3713  block->additional.size, cluster->pos,
3714  block->discard_padding);
3715  }
3716 
3717  ebml_free(matroska_blockgroup, block);
3718  memset(block, 0, sizeof(*block));
3719  } else if (!matroska->num_levels) {
3720  if (!avio_feof(matroska->ctx->pb)) {
3721  avio_r8(matroska->ctx->pb);
3722  if (!avio_feof(matroska->ctx->pb)) {
3723  av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3724  "end of segment.\n");
3725  return AVERROR_INVALIDDATA;
3726  }
3727  }
3728  matroska->done = 1;
3729  return AVERROR_EOF;
3730  }
3731 
3732  return res;
3733 }
3734 
3736 {
3737  MatroskaDemuxContext *matroska = s->priv_data;
3738  int ret = 0;
3739 
3740  if (matroska->resync_pos == -1) {
3741  // This can only happen if generic seeking has been used.
3742  matroska->resync_pos = avio_tell(s->pb);
3743  }
3744 
3745  while (matroska_deliver_packet(matroska, pkt)) {
3746  if (matroska->done)
3747  return (ret < 0) ? ret : AVERROR_EOF;
3748  if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3749  ret = matroska_resync(matroska, matroska->resync_pos);
3750  }
3751 
3752  return 0;
3753 }
3754 
3755 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3756  int64_t timestamp, int flags)
3757 {
3758  MatroskaDemuxContext *matroska = s->priv_data;
3759  MatroskaTrack *tracks = NULL;
3760  AVStream *st = s->streams[stream_index];
3761  int i, index;
3762 
3763  /* Parse the CUES now since we need the index data to seek. */
3764  if (matroska->cues_parsing_deferred > 0) {
3765  matroska->cues_parsing_deferred = 0;
3766  matroska_parse_cues(matroska);
3767  }
3768 
3769  if (!st->nb_index_entries)
3770  goto err;
3771  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3772 
3773  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3774  matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3775  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3776  matroska_clear_queue(matroska);
3777  if (matroska_parse_cluster(matroska) < 0)
3778  break;
3779  }
3780  }
3781 
3782  matroska_clear_queue(matroska);
3783  if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3784  goto err;
3785 
3786  tracks = matroska->tracks.elem;
3787  for (i = 0; i < matroska->tracks.nb_elem; i++) {
3788  tracks[i].audio.pkt_cnt = 0;
3789  tracks[i].audio.sub_packet_cnt = 0;
3790  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3791  tracks[i].end_timecode = 0;
3792  }
3793 
3794  /* We seek to a level 1 element, so set the appropriate status. */
3795  matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3796  if (flags & AVSEEK_FLAG_ANY) {
3797  st->skip_to_keyframe = 0;
3798  matroska->skip_to_timecode = timestamp;
3799  } else {
3800  st->skip_to_keyframe = 1;
3801  matroska->skip_to_timecode = st->index_entries[index].timestamp;
3802  }
3803  matroska->skip_to_keyframe = 1;
3804  matroska->done = 0;
3805  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3806  return 0;
3807 err:
3808  // slightly hackish but allows proper fallback to
3809  // the generic seeking code.
3810  matroska_reset_status(matroska, 0, -1);
3811  matroska->resync_pos = -1;
3812  matroska_clear_queue(matroska);
3813  st->skip_to_keyframe =
3814  matroska->skip_to_keyframe = 0;
3815  matroska->done = 0;
3816  return -1;
3817 }
3818 
3820 {
3821  MatroskaDemuxContext *matroska = s->priv_data;
3822  MatroskaTrack *tracks = matroska->tracks.elem;
3823  int n;
3824 
3825  matroska_clear_queue(matroska);
3826 
3827  for (n = 0; n < matroska->tracks.nb_elem; n++)
3828  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3829  av_freep(&tracks[n].audio.buf);
3830  ebml_free(matroska_segment, matroska);
3831 
3832  return 0;
3833 }
3834 
3835 typedef struct {
3836  int64_t start_time_ns;
3837  int64_t end_time_ns;
3838  int64_t start_offset;
3839  int64_t end_offset;
3840 } CueDesc;
3841 
3842 /* This function searches all the Cues and returns the CueDesc corresponding to
3843  * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3844  * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3845  */
3846 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3847  MatroskaDemuxContext *matroska = s->priv_data;
3848  CueDesc cue_desc;
3849  int i;
3850  int nb_index_entries = s->streams[0]->nb_index_entries;
3851  AVIndexEntry *index_entries = s->streams[0]->index_entries;
3852  if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3853  for (i = 1; i < nb_index_entries; i++) {
3854  if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3855  index_entries[i].timestamp * matroska->time_scale > ts) {
3856  break;
3857  }
3858  }
3859  --i;
3860  cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3861  cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3862  if (i != nb_index_entries - 1) {
3863  cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3864  cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3865  } else {
3866  cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3867  // FIXME: this needs special handling for files where Cues appear
3868  // before Clusters. the current logic assumes Cues appear after
3869  // Clusters.
3870  cue_desc.end_offset = cues_start - matroska->segment_start;
3871  }
3872  return cue_desc;
3873 }
3874 
3876 {
3877  MatroskaDemuxContext *matroska = s->priv_data;
3878  uint32_t id = matroska->current_id;
3879  int64_t cluster_pos, before_pos;
3880  int index, rv = 1;
3881  if (s->streams[0]->nb_index_entries <= 0) return 0;
3882  // seek to the first cluster using cues.
3883  index = av_index_search_timestamp(s->streams[0], 0, 0);
3884  if (index < 0) return 0;
3885  cluster_pos = s->streams[0]->index_entries[index].pos;
3886  before_pos = avio_tell(s->pb);
3887  while (1) {
3888  uint64_t cluster_id, cluster_length;
3889  int read;
3890  AVPacket *pkt;
3891  avio_seek(s->pb, cluster_pos, SEEK_SET);
3892  // read cluster id and length
3893  read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3894  if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3895  break;
3896  read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3897  if (read < 0)
3898  break;
3899 
3900  matroska_reset_status(matroska, 0, cluster_pos);
3901  matroska_clear_queue(matroska);
3902  if (matroska_parse_cluster(matroska) < 0 ||
3903  !matroska->queue) {
3904  break;
3905  }
3906  pkt = &matroska->queue->pkt;
3907  // 4 + read is the length of the cluster id and the cluster length field.
3908  cluster_pos += 4 + read + cluster_length;
3909  if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3910  rv = 0;
3911  break;
3912  }
3913  }
3914 
3915  /* Restore the status after matroska_read_header: */
3916  matroska_reset_status(matroska, id, before_pos);
3917 
3918  return rv;
3919 }
3920 
3921 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3922  double min_buffer, double* buffer,
3923  double* sec_to_download, AVFormatContext *s,
3924  int64_t cues_start)
3925 {
3926  double nano_seconds_per_second = 1000000000.0;
3927  double time_sec = time_ns / nano_seconds_per_second;
3928  int rv = 0;
3929  int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3930  int64_t end_time_ns = time_ns + time_to_search_ns;
3931  double sec_downloaded = 0.0;
3932  CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3933  if (desc_curr.start_time_ns == -1)
3934  return -1;
3935  *sec_to_download = 0.0;
3936 
3937  // Check for non cue start time.
3938  if (time_ns > desc_curr.start_time_ns) {
3939  int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3940  double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3941  double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3942  double timeToDownload = (cueBytes * 8.0) / bps;
3943 
3944  sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3945  *sec_to_download += timeToDownload;
3946 
3947  // Check if the search ends within the first cue.
3948  if (desc_curr.end_time_ns >= end_time_ns) {
3949  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3950  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3951  sec_downloaded = percent_to_sub * sec_downloaded;
3952  *sec_to_download = percent_to_sub * *sec_to_download;
3953  }
3954 
3955  if ((sec_downloaded + *buffer) <= min_buffer) {
3956  return 1;
3957  }
3958 
3959  // Get the next Cue.
3960  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3961  }
3962 
3963  while (desc_curr.start_time_ns != -1) {
3964  int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3965  int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3966  double desc_sec = desc_ns / nano_seconds_per_second;
3967  double bits = (desc_bytes * 8.0);
3968  double time_to_download = bits / bps;
3969 
3970  sec_downloaded += desc_sec - time_to_download;
3971  *sec_to_download += time_to_download;
3972 
3973  if (desc_curr.end_time_ns >= end_time_ns) {
3974  double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3975  double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3976  sec_downloaded = percent_to_sub * sec_downloaded;
3977  *sec_to_download = percent_to_sub * *sec_to_download;
3978 
3979  if ((sec_downloaded + *buffer) <= min_buffer)
3980  rv = 1;
3981  break;
3982  }
3983 
3984  if ((sec_downloaded + *buffer) <= min_buffer) {
3985  rv = 1;
3986  break;
3987  }
3988 
3989  desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3990  }
3991  *buffer = *buffer + sec_downloaded;
3992  return rv;
3993 }
3994 
3995 /* This function computes the bandwidth of the WebM file with the help of
3996  * buffer_size_after_time_downloaded() function. Both of these functions are
3997  * adapted from WebM Tools project and are adapted to work with FFmpeg's
3998  * Matroska parsing mechanism.
3999  *
4000  * Returns the bandwidth of the file on success; -1 on error.
4001  * */
4002 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
4003 {
4004  MatroskaDemuxContext *matroska = s->priv_data;
4005  AVStream *st = s->streams[0];
4006  double bandwidth = 0.0;
4007  int i;
4008 
4009  for (i = 0; i < st->nb_index_entries; i++) {
4010  int64_t prebuffer_ns = 1000000000;
4011  int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
4012  double nano_seconds_per_second = 1000000000.0;
4013  int64_t prebuffered_ns = time_ns + prebuffer_ns;
4014  double prebuffer_bytes = 0.0;
4015  int64_t temp_prebuffer_ns = prebuffer_ns;
4016  int64_t pre_bytes, pre_ns;
4017  double pre_sec, prebuffer, bits_per_second;
4018  CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4019 
4020  // Start with the first Cue.
4021  CueDesc desc_end = desc_beg;
4022 
4023  // Figure out how much data we have downloaded for the prebuffer. This will
4024  // be used later to adjust the bits per sample to try.
4025  while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4026  // Prebuffered the entire Cue.
4027  prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4028  temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4029  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4030  }
4031  if (desc_end.start_time_ns == -1) {
4032  // The prebuffer is larger than the duration.
4033  if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4034  return -1;
4035  bits_per_second = 0.0;
4036  } else {
4037  // The prebuffer ends in the last Cue. Estimate how much data was
4038  // prebuffered.
4039  pre_bytes = desc_end.end_offset - desc_end.start_offset;
4040  pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4041  pre_sec = pre_ns / nano_seconds_per_second;
4042  prebuffer_bytes +=
4043  pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4044 
4045  prebuffer = prebuffer_ns / nano_seconds_per_second;
4046 
4047  // Set this to 0.0 in case our prebuffer buffers the entire video.
4048  bits_per_second = 0.0;
4049  do {
4050  int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4051  int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4052  double desc_sec = desc_ns / nano_seconds_per_second;
4053  double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4054 
4055  // Drop the bps by the percentage of bytes buffered.
4056  double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4057  double mod_bits_per_second = calc_bits_per_second * percent;
4058 
4059  if (prebuffer < desc_sec) {
4060  double search_sec =
4061  (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4062 
4063  // Add 1 so the bits per second should be a little bit greater than file
4064  // datarate.
4065  int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4066  const double min_buffer = 0.0;
4067  double buffer = prebuffer;
4068  double sec_to_download = 0.0;
4069 
4070  int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4071  min_buffer, &buffer, &sec_to_download,
4072  s, cues_start);
4073  if (rv < 0) {
4074  return -1;
4075  } else if (rv == 0) {
4076  bits_per_second = (double)(bps);
4077  break;
4078  }
4079  }
4080 
4081  desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4082  } while (desc_end.start_time_ns != -1);
4083  }
4084  if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4085  }
4086  return (int64_t)bandwidth;
4087 }
4088 
4089 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4090 {
4091  MatroskaDemuxContext *matroska = s->priv_data;
4092  EbmlList *seekhead_list = &matroska->seekhead;
4093  MatroskaSeekhead *seekhead = seekhead_list->elem;
4094  char *buf;
4095  int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4096  int i;
4097  int end = 0;
4098 
4099  // determine cues start and end positions
4100  for (i = 0; i < seekhead_list->nb_elem; i++)
4101  if (seekhead[i].id == MATROSKA_ID_CUES)
4102  break;
4103 
4104  if (i >= seekhead_list->nb_elem) return -1;
4105 
4106  before_pos = avio_tell(matroska->ctx->pb);
4107  cues_start = seekhead[i].pos + matroska->segment_start;
4108  if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4109  // cues_end is computed as cues_start + cues_length + length of the
4110  // Cues element ID (i.e. 4) + EBML length of the Cues element.
4111  // cues_end is inclusive and the above sum is reduced by 1.
4112  uint64_t cues_length, cues_id;
4113  int bytes_read;
4114  bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4115  if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4116  return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4117  bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4118  if (bytes_read < 0)
4119  return bytes_read;
4120  cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4121  }
4122  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4123  if (cues_start == -1 || cues_end == -1) return -1;
4124 
4125  // parse the cues
4126  matroska_parse_cues(matroska);
4127 
4128  // cues start
4129  av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4130 
4131  // cues end
4132  av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4133 
4134  // if the file has cues at the start, fix up the init range so that
4135  // it does not include it
4136  if (cues_start <= init_range)
4137  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4138 
4139  // bandwidth
4140  bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4141  if (bandwidth < 0) return -1;
4142  av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4143 
4144  // check if all clusters start with key frames
4146 
4147  // store cue point timestamps as a comma separated list for checking subsegment alignment in
4148  // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4149  buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4150  if (!buf) return -1;
4151  strcpy(buf, "");
4152  for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4153  int ret = snprintf(buf + end, 20,
4154  "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4155  i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4156  if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4157  av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4158  av_free(buf);
4159  return AVERROR_INVALIDDATA;
4160  }
4161  end += ret;
4162  }
4165 
4166  return 0;
4167 }
4168 
4170 {
4171  char *buf;
4172  int ret = matroska_read_header(s);
4173  int64_t init_range;
4174  MatroskaTrack *tracks;
4175  MatroskaDemuxContext *matroska = s->priv_data;
4176  if (ret) {
4177  av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4178  return -1;
4179  }
4180  if (!matroska->tracks.nb_elem || !s->nb_streams) {
4181  av_log(s, AV_LOG_ERROR, "No track found\n");
4182  ret = AVERROR_INVALIDDATA;
4183  goto fail;
4184  }
4185 
4186  if (!matroska->is_live) {
4187  buf = av_asprintf("%g", matroska->duration);
4188  if (!buf) {
4189  ret = AVERROR(ENOMEM);
4190  goto fail;
4191  }
4194 
4195  // initialization range
4196  // 5 is the offset of Cluster ID.
4197  init_range = avio_tell(s->pb) - 5;
4198  av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4199  }
4200 
4201  // basename of the file
4202  buf = strrchr(s->url, '/');
4203  av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4204 
4205  // track number
4206  tracks = matroska->tracks.elem;
4207  av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4208 
4209  // parse the cues and populate Cue related fields
4210  if (!matroska->is_live) {
4211  ret = webm_dash_manifest_cues(s, init_range);
4212  if (ret < 0) {
4213  av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4214  goto fail;
4215  }
4216  }
4217 
4218  // use the bandwidth from the command line if it was provided
4219  if (matroska->bandwidth > 0) {
4221  matroska->bandwidth, 0);
4222  }
4223  return 0;
4224 fail:
4226  return ret;
4227 }
4228 
4230 {
4231  return AVERROR_EOF;
4232 }
4233 
4234 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4235 static const AVOption options[] = {
4236  { "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 },
4237  { "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 },
4238  { NULL },
4239 };
4240 
4241 static const AVClass webm_dash_class = {
4242  .class_name = "WebM DASH Manifest demuxer",
4243  .item_name = av_default_item_name,
4244  .option = options,
4245  .version = LIBAVUTIL_VERSION_INT,
4246 };
4247 
4249  .name = "matroska,webm",
4250  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4251  .extensions = "mkv,mk3d,mka,mks",
4252  .priv_data_size = sizeof(MatroskaDemuxContext),
4258  .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4259 };
4260 
4262  .name = "webm_dash_manifest",
4263  .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4264  .priv_data_size = sizeof(MatroskaDemuxContext),
4268  .priv_class = &webm_dash_class,
4269 };
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:107
#define MATROSKA_ID_VIDEOPROJECTIONPOSEYAW
Definition: matroska.h:159
AVSphericalMapping * av_spherical_alloc(size_t *size)
Allocate a AVSphericalVideo structure and initialize its fields to default values.
Definition: spherical.c:24
uint64_t codec_delay_in_track_tb
Definition: matroskadec.c:248
enum AVChromaLocation chroma_location
Definition: codec_par.h:150
#define AV_DISPOSITION_METADATA
Definition: avformat.h:858
#define NULL
Definition: coverity.c:32
MatroskaBlock block
Definition: matroskadec.c:331
static EbmlSyntax matroska_simpletag[]
Definition: matroskadec.c:654
#define MATROSKA_ID_BLOCKADDID
Definition: matroska.h:230
#define MATROSKA_ID_TRACKDEFAULTDURATION
Definition: matroska.h:104
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:3116
Bytestream IO Context.
Definition: avio.h:161
enum AVColorTransferCharacteristic color_trc
Definition: codec_par.h:148
#define MATROSKA_ID_VIDEOFLAGINTERLACED
Definition: matroska.h:121
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define MATROSKA_ID_VIDEOCOLOR_GX
Definition: matroska.h:147
uint64_t seek_preroll
Definition: matroskadec.c:242
const char *const ff_matroska_video_stereo_plane[MATROSKA_VIDEO_STEREO_PLANE_COUNT]
Definition: matroska.c:146
version
Definition: libkvazaar.c:317
static void matroska_convert_tags(AVFormatContext *s)
Definition: matroskadec.c:1757
#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:233
unsigned MaxCLL
Max content light level (cd/m^2).
#define MATROSKA_ID_TRACKFLAGLACING
Definition: matroska.h:101
static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: matroskadec.c:4229
#define MATROSKA_ID_TRACKENTRY
Definition: matroska.h:75
static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
Definition: matroskadec.c:2988
static const CodecMime mkv_image_mime_tags[]
Definition: matroskadec.c:753
#define MATROSKA_ID_VIDEODISPLAYHEIGHT
Definition: matroska.h:113
uint64_t version
Definition: matroskadec.c:126
AVOption.
Definition: opt.h:248
static EbmlSyntax matroska_blockmore[]
Definition: matroskadec.c:712
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:4248
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:1983
AVPacketList * queue
Definition: matroskadec.c:369
#define MATROSKA_ID_VIDEOPROJECTIONPOSEROLL
Definition: matroska.h:161
#define MATROSKA_ID_CUETRACKPOSITION
Definition: matroska.h:192
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3096
#define MATROSKA_ID_CODECPRIVATE
Definition: matroska.h:89
const unsigned char ff_sipr_subpk_size[4]
Definition: rmsipr.c:25
#define MATROSKA_ID_TAGTARGETS_TYPE
Definition: matroska.h:210
uint64_t display_unit
Definition: matroskadec.c:195
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
static EbmlSyntax matroska_track_video[19]
Definition: matroskadec.c:400
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
#define INITIALIZATION_RANGE
Definition: matroska.h:370
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:3875
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:4869
int64_t pos
Definition: avformat.h:805
#define MATROSKA_ID_ENCODINGTYPE
Definition: matroska.h:173
#define MATROSKA_ID_AUDIOBITDEPTH
Definition: matroska.h:167
uint64_t chapteruid
Definition: matroskadec.c:301
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2509
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:325
EbmlList tag
Definition: matroskadec.c:307
static int segment_start(AVFormatContext *s, int write_header)
Definition: segment.c:239
uint64_t uid
Definition: matroskadec.c:232
int64_t data_offset
offset of the first packet
Definition: internal.h:80
static EbmlSyntax matroska_segments[]
Definition: matroskadec.c:707
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
MatroskaCluster current_cluster
Definition: matroskadec.c:385
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:938
#define MATROSKA_ID_TAGTARGETS_ATTACHUID
Definition: matroska.h:214
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:877
int size
Definition: packet.h:364
static EbmlSyntax matroska_track_video_projection[]
Definition: matroskadec.c:467
#define MATROSKA_ID_CLUSTERPOSITION
Definition: matroska.h:225
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define MATROSKA_ID_FILEDATA
Definition: matroska.h:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1105
MatroskaTrackVideoProjection projection
Definition: matroskadec.c:201
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1804
#define EBML_ID_DOCTYPEREADVERSION
Definition: matroska.h:42
#define MATROSKA_ID_BLOCKREFERENCE
Definition: matroska.h:237
uint64_t flag_forced
Definition: matroskadec.c:241
int av_log2(unsigned v)
Definition: intmath.c:26
uint64_t max_size
Definition: matroskadec.c:127
#define MATROSKA_ID_TRACKTYPE
Definition: matroska.h:80
unsigned char * buffer
Start of the buffer.
Definition: avio.h:226
#define MATROSKA_ID_TAGTARGETS_CHAPTERUID
Definition: matroska.h:213
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
GLint GLenum type
Definition: opengl_enc.c:104
uint64_t flag_default
Definition: matroskadec.c:240
#define MATROSKA_ID_VIDEOCOLOR_RX
Definition: matroska.h:145
Video represents a sphere mapped on a flat surface using equirectangular projection.
Definition: spherical.h:56
#define MATROSKA_ID_VIDEOASPECTRATIO
Definition: matroska.h:125
int out_size
Definition: movenc.c:55
#define MATROSKA_ID_MUXINGAPP
Definition: matroska.h:70
#define MATROSKA_ID_AUDIOCHANNELS
Definition: matroska.h:168
char * name
Definition: matroskadec.c:290
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.
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:400
discard all
Definition: avcodec.h:236
#define MATROSKA_ID_VIDEOPROJECTIONTYPE
Definition: matroska.h:157
MatroskaLevel levels[EBML_MAX_DEPTH]
Definition: matroskadec.c:347
static EbmlSyntax matroska_track_audio[]
Definition: matroskadec.c:498
static AVPacket pkt
#define MATROSKA_ID_CUECLUSTERPOSITION
Definition: matroska.h:196
#define MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX
Definition: matroska.h:153
static int ebml_read_binary(AVIOContext *pb, int length, int64_t pos, EbmlBin *bin)
Definition: matroskadec.c:1002
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:775
MatroskaTrackAudio audio
Definition: matroskadec.c:244
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ
Definition: matroska.h:135
uint64_t duration
Definition: matroskadec.c:321
const struct EbmlSyntax * n
Definition: matroskadec.c:108
#define MATROSKA_ID_EDITIONFLAGDEFAULT
Definition: matroska.h:260
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define MATROSKA_ID_CLUSTERTIMECODE
Definition: matroska.h:224
#define EBML_ID_DOCTYPE
Definition: matroska.h:40
#define MATROSKA_ID_ENCODINGENCALGO
Definition: matroska.h:180
static EbmlSyntax matroska_attachment[]
Definition: matroskadec.c:587
#define MATROSKA_ID_CHAPTERTIMEEND
Definition: matroska.h:253
enum AVColorSpace color_space
Definition: codec_par.h:149
#define MATROSKA_ID_TRACKCONTENTENCODINGS
Definition: matroska.h:105
int frame_size
Audio only.
Definition: codec_par.h:181
Mastering display metadata (based on SMPTE-2086:2014).
Definition: packet.h:222
#define AV_LZO_OUTPUT_FULL
decoded data did not fit into output buffer
Definition: lzo.h:39
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4578
#define EBML_VERSION
Definition: matroska.h:30
#define MATROSKA_ID_FILEDESC
Definition: matroska.h:243
Format I/O context.
Definition: avformat.h:1351
#define EBML_ID_CRC32
Definition: matroska.h:46
uint64_t def
Definition: matroskadec.c:293
UID uid
Definition: mxfenc.c:2165
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
Update cur_dts of all streams based on the given timestamp and AVStream.
Definition: utils.c:1897
#define MATROSKA_ID_TRACKCONTENTENCODING
Definition: matroska.h:106
#define MATROSKA_ID_CODECDOWNLOADURL
Definition: matroska.h:92
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define AV_WB64(p, v)
Definition: intreadwrite.h:433
int64_t end_timecode
Definition: matroskadec.c:251