repositories / deb_ffmpeg.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavformat / matroskadec.c
CommitLineData
2ba45a60
DM		 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>
2ba45a60
DM		 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"
42#include "libavutil/mathematics.h"
f6fa7814 43#include "libavutil/time_internal.h"
2ba45a60
DM		 44
45#include "libavcodec/bytestream.h"
46#include "libavcodec/flac.h"
47#include "libavcodec/mpeg4audio.h"
48
49#include "avformat.h"
50#include "avio_internal.h"
51#include "internal.h"
52#include "isom.h"
53#include "matroska.h"
54#include "oggdec.h"
55/* For ff_codec_get_id(). */
56#include "riff.h"
57#include "rmsipr.h"
58
f6fa7814
DM		 59#if CONFIG_BZLIB
60#include <bzlib.h>
61#endif
62#if CONFIG_ZLIB
63#include <zlib.h>
64#endif
65
2ba45a60
DM		 66typedef enum {
67 EBML_NONE,
68 EBML_UINT,
69 EBML_FLOAT,
70 EBML_STR,
71 EBML_UTF8,
72 EBML_BIN,
73 EBML_NEST,
74 EBML_PASS,
75 EBML_STOP,
76 EBML_SINT,
77 EBML_TYPE_COUNT
78} EbmlType;
79
80typedef const struct EbmlSyntax {
81 uint32_t id;
82 EbmlType type;
83 int list_elem_size;
84 int data_offset;
85 union {
86 uint64_t u;
87 double f;
88 const char *s;
89 const struct EbmlSyntax *n;
90 } def;
91} EbmlSyntax;
92
93typedef struct {
94 int nb_elem;
95 void *elem;
96} EbmlList;
97
98typedef struct {
99 int size;
100 uint8_t *data;
101 int64_t pos;
102} EbmlBin;
103
104typedef struct {
105 uint64_t version;
106 uint64_t max_size;
107 uint64_t id_length;
108 char *doctype;
109 uint64_t doctype_version;
110} Ebml;
111
112typedef struct {
113 uint64_t algo;
114 EbmlBin settings;
115} MatroskaTrackCompression;
116
117typedef struct {
118 uint64_t algo;
119 EbmlBin key_id;
120} MatroskaTrackEncryption;
121
122typedef struct {
123 uint64_t scope;
124 uint64_t type;
125 MatroskaTrackCompression compression;
126 MatroskaTrackEncryption encryption;
127} MatroskaTrackEncoding;
128
129typedef struct {
130 double frame_rate;
131 uint64_t display_width;
132 uint64_t display_height;
133 uint64_t pixel_width;
134 uint64_t pixel_height;
135 EbmlBin color_space;
136 uint64_t stereo_mode;
137 uint64_t alpha_mode;
138} MatroskaTrackVideo;
139
140typedef struct {
141 double samplerate;
142 double out_samplerate;
143 uint64_t bitdepth;
144 uint64_t channels;
145
146 /* real audio header (extracted from extradata) */
147 int coded_framesize;
148 int sub_packet_h;
149 int frame_size;
150 int sub_packet_size;
151 int sub_packet_cnt;
152 int pkt_cnt;
153 uint64_t buf_timecode;
154 uint8_t *buf;
155} MatroskaTrackAudio;
156
157typedef struct {
158 uint64_t uid;
159 uint64_t type;
160} MatroskaTrackPlane;
161
162typedef struct {
163 EbmlList combine_planes;
164} MatroskaTrackOperation;
165
166typedef struct {
167 uint64_t num;
168 uint64_t uid;
169 uint64_t type;
170 char *name;
171 char *codec_id;
172 EbmlBin codec_priv;
173 char *language;
174 double time_scale;
175 uint64_t default_duration;
176 uint64_t flag_default;
177 uint64_t flag_forced;
178 uint64_t seek_preroll;
179 MatroskaTrackVideo video;
180 MatroskaTrackAudio audio;
181 MatroskaTrackOperation operation;
182 EbmlList encodings;
183 uint64_t codec_delay;
184
185 AVStream *stream;
186 int64_t end_timecode;
187 int ms_compat;
188 uint64_t max_block_additional_id;
189} MatroskaTrack;
190
191typedef struct {
192 uint64_t uid;
193 char *filename;
194 char *mime;
195 EbmlBin bin;
196
197 AVStream *stream;
198} MatroskaAttachment;
199
200typedef struct {
201 uint64_t start;
202 uint64_t end;
203 uint64_t uid;
204 char *title;
205
206 AVChapter *chapter;
207} MatroskaChapter;
208
209typedef struct {
210 uint64_t track;
211 uint64_t pos;
212} MatroskaIndexPos;
213
214typedef struct {
215 uint64_t time;
216 EbmlList pos;
217} MatroskaIndex;
218
219typedef struct {
220 char *name;
221 char *string;
222 char *lang;
223 uint64_t def;
224 EbmlList sub;
225} MatroskaTag;
226
227typedef struct {
228 char *type;
229 uint64_t typevalue;
230 uint64_t trackuid;
231 uint64_t chapteruid;
232 uint64_t attachuid;
233} MatroskaTagTarget;
234
235typedef struct {
236 MatroskaTagTarget target;
237 EbmlList tag;
238} MatroskaTags;
239
240typedef struct {
241 uint64_t id;
242 uint64_t pos;
243} MatroskaSeekhead;
244
245typedef struct {
246 uint64_t start;
247 uint64_t length;
248} MatroskaLevel;
249
250typedef struct {
251 uint64_t timecode;
252 EbmlList blocks;
253} MatroskaCluster;
254
255typedef struct {
256 AVFormatContext *ctx;
257
258 /* EBML stuff */
259 int num_levels;
260 MatroskaLevel levels[EBML_MAX_DEPTH];
261 int level_up;
262 uint32_t current_id;
263
264 uint64_t time_scale;
265 double duration;
266 char *title;
267 char *muxingapp;
268 EbmlBin date_utc;
269 EbmlList tracks;
270 EbmlList attachments;
271 EbmlList chapters;
272 EbmlList index;
273 EbmlList tags;
274 EbmlList seekhead;
275
276 /* byte position of the segment inside the stream */
277 int64_t segment_start;
278
279 /* the packet queue */
280 AVPacket **packets;
281 int num_packets;
282 AVPacket *prev_pkt;
283
284 int done;
285
286 /* What to skip before effectively reading a packet. */
287 int skip_to_keyframe;
288 uint64_t skip_to_timecode;
289
290 /* File has a CUES element, but we defer parsing until it is needed. */
291 int cues_parsing_deferred;
292
293 int current_cluster_num_blocks;
294 int64_t current_cluster_pos;
295 MatroskaCluster current_cluster;
296
297 /* File has SSA subtitles which prevent incremental cluster parsing. */
298 int contains_ssa;
299} MatroskaDemuxContext;
300
301typedef struct {
302 uint64_t duration;
303 int64_t reference;
304 uint64_t non_simple;
305 EbmlBin bin;
306 uint64_t additional_id;
307 EbmlBin additional;
308 int64_t discard_padding;
309} MatroskaBlock;
310
311static EbmlSyntax ebml_header[] = {
312 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
313 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
314 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
315 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
316 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
317 { EBML_ID_EBMLVERSION, EBML_NONE },
318 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
319 { 0 }
320};
321
322static EbmlSyntax ebml_syntax[] = {
323 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
324 { 0 }
325};
326
327static EbmlSyntax matroska_info[] = {
328 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
329 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
330 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
331 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
332 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
333 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
334 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
335 { 0 }
336};
337
338static EbmlSyntax matroska_track_video[] = {
339 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
340 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
341 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
342 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
343 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
344 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
345 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
346 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
347 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
348 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
349 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
350 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
351 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
352 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
353 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
354 { 0 }
355};
356
357static EbmlSyntax matroska_track_audio[] = {
358 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
359 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
360 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
361 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
362 { 0 }
363};
364
365static EbmlSyntax matroska_track_encoding_compression[] = {
366 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
367 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
368 { 0 }
369};
370
371static EbmlSyntax matroska_track_encoding_encryption[] = {
372 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
373 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
374 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
375 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
376 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
377 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
378 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
379 { 0 }
380};
381static EbmlSyntax matroska_track_encoding[] = {
382 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
383 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
384 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
385 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
386 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
387 { 0 }
388};
389
390static EbmlSyntax matroska_track_encodings[] = {
391 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
392 { 0 }
393};
394
395static EbmlSyntax matroska_track_plane[] = {
396 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
397 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
398 { 0 }
399};
400
401static EbmlSyntax matroska_track_combine_planes[] = {
402 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
403 { 0 }
404};
405
406static EbmlSyntax matroska_track_operation[] = {
407 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
408 { 0 }
409};
410
411static EbmlSyntax matroska_track[] = {
412 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
413 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
414 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
415 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
416 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
417 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
418 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
419 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
420 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
421 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
422 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
423 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
424 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
425 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
426 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
427 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
428 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
429 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
430 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
431 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
432 { MATROSKA_ID_CODECNAME, EBML_NONE },
433 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
434 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
435 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
436 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
437 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
438 { 0 }
439};
440
441static EbmlSyntax matroska_tracks[] = {
442 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
443 { 0 }
444};
445
446static EbmlSyntax matroska_attachment[] = {
447 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
448 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
449 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
450 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
451 { MATROSKA_ID_FILEDESC, EBML_NONE },
452 { 0 }
453};
454
455static EbmlSyntax matroska_attachments[] = {
456 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
457 { 0 }
458};
459
460static EbmlSyntax matroska_chapter_display[] = {
461 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
462 { MATROSKA_ID_CHAPLANG, EBML_NONE },
463 { 0 }
464};
465
466static EbmlSyntax matroska_chapter_entry[] = {
467 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
468 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
469 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
470 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
471 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
472 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
473 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
474 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
475 { 0 }
476};
477
478static EbmlSyntax matroska_chapter[] = {
479 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
480 { MATROSKA_ID_EDITIONUID, EBML_NONE },
481 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
482 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
483 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
484 { 0 }
485};
486
487static EbmlSyntax matroska_chapters[] = {
488 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
489 { 0 }
490};
491
492static EbmlSyntax matroska_index_pos[] = {
493 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
494 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
495 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
496 { MATROSKA_ID_CUEDURATION, EBML_NONE },
497 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
498 { 0 }
499};
500
501static EbmlSyntax matroska_index_entry[] = {
502 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
503 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
504 { 0 }
505};
506
507static EbmlSyntax matroska_index[] = {
508 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
509 { 0 }
510};
511
512static EbmlSyntax matroska_simpletag[] = {
513 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
514 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
515 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
516 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
517 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
518 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
519 { 0 }
520};
521
522static EbmlSyntax matroska_tagtargets[] = {
523 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
524 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
525 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
526 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
527 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
528 { 0 }
529};
530
531static EbmlSyntax matroska_tag[] = {
532 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
533 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
534 { 0 }
535};
536
537static EbmlSyntax matroska_tags[] = {
538 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
539 { 0 }
540};
541
542static EbmlSyntax matroska_seekhead_entry[] = {
543 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
544 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
545 { 0 }
546};
547
548static EbmlSyntax matroska_seekhead[] = {
549 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
550 { 0 }
551};
552
553static EbmlSyntax matroska_segment[] = {
554 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } },
555 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } },
556 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } },
557 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } },
558 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } },
559 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } },
560 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } },
561 { MATROSKA_ID_CLUSTER, EBML_STOP },
562 { 0 }
563};
564
565static EbmlSyntax matroska_segments[] = {
566 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
567 { 0 }
568};
569
570static EbmlSyntax matroska_blockmore[] = {
571 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
572 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
573 { 0 }
574};
575
576static EbmlSyntax matroska_blockadditions[] = {
577 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
578 { 0 }
579};
580
581static EbmlSyntax matroska_blockgroup[] = {
582 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
583 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
584 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
585 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
586 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
587 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
588 { MATROSKA_ID_CODECSTATE, EBML_NONE },
589 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
590 { 0 }
591};
592
593static EbmlSyntax matroska_cluster[] = {
594 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
595 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
596 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
597 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
598 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
599 { 0 }
600};
601
602static EbmlSyntax matroska_clusters[] = {
603 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
604 { MATROSKA_ID_INFO, EBML_NONE },
605 { MATROSKA_ID_CUES, EBML_NONE },
606 { MATROSKA_ID_TAGS, EBML_NONE },
607 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
608 { 0 }
609};
610
611static EbmlSyntax matroska_cluster_incremental_parsing[] = {
612 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
613 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
614 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
615 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
616 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
617 { MATROSKA_ID_INFO, EBML_NONE },
618 { MATROSKA_ID_CUES, EBML_NONE },
619 { MATROSKA_ID_TAGS, EBML_NONE },
620 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
621 { MATROSKA_ID_CLUSTER, EBML_STOP },
622 { 0 }
623};
624
625static EbmlSyntax matroska_cluster_incremental[] = {
626 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
627 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
628 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
629 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
630 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
631 { 0 }
632};
633
634static EbmlSyntax matroska_clusters_incremental[] = {
635 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
636 { MATROSKA_ID_INFO, EBML_NONE },
637 { MATROSKA_ID_CUES, EBML_NONE },
638 { MATROSKA_ID_TAGS, EBML_NONE },
639 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
640 { 0 }
641};
642
643static const char *const matroska_doctypes[] = { "matroska", "webm" };
644
645static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
646{
647 AVIOContext *pb = matroska->ctx->pb;
648 uint32_t id;
649 matroska->current_id = 0;
650 matroska->num_levels = 0;
651
652 /* seek to next position to resync from */
653 if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
654 goto eof;
655
656 id = avio_rb32(pb);
657
658 // try to find a toplevel element
659 while (!avio_feof(pb)) {
660 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
661 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
662 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
663 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
664 matroska->current_id = id;
665 return 0;
666 }
667 id = (id << 8) | avio_r8(pb);
668 }
669
670eof:
671 matroska->done = 1;
672 return AVERROR_EOF;
673}
674
675/*
676 * Return: Whether we reached the end of a level in the hierarchy or not.
677 */
678static int ebml_level_end(MatroskaDemuxContext *matroska)
679{
680 AVIOContext *pb = matroska->ctx->pb;
681 int64_t pos = avio_tell(pb);
682
683 if (matroska->num_levels > 0) {
684 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
685 if (pos - level->start >= level->length || matroska->current_id) {
686 matroska->num_levels--;
687 return 1;
688 }
689 }
690 return 0;
691}
692
693/*
694 * Read: an "EBML number", which is defined as a variable-length
695 * array of bytes. The first byte indicates the length by giving a
696 * number of 0-bits followed by a one. The position of the first
697 * "one" bit inside the first byte indicates the length of this
698 * number.
699 * Returns: number of bytes read, < 0 on error
700 */
701static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
702 int max_size, uint64_t *number)
703{
704 int read = 1, n = 1;
705 uint64_t total = 0;
706
707 /* The first byte tells us the length in bytes - avio_r8() can normally
708 * return 0, but since that's not a valid first ebmlID byte, we can
709 * use it safely here to catch EOS. */
710 if (!(total = avio_r8(pb))) {
711 /* we might encounter EOS here */
712 if (!avio_feof(pb)) {
713 int64_t pos = avio_tell(pb);
714 av_log(matroska->ctx, AV_LOG_ERROR,
715 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
716 pos, pos);
717 return pb->error ? pb->error : AVERROR(EIO);
718 }
719 return AVERROR_EOF;
720 }
721
722 /* get the length of the EBML number */
723 read = 8 - ff_log2_tab[total];
724 if (read > max_size) {
725 int64_t pos = avio_tell(pb) - 1;
726 av_log(matroska->ctx, AV_LOG_ERROR,
727 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
728 (uint8_t) total, pos, pos);
729 return AVERROR_INVALIDDATA;
730 }
731
732 /* read out length */
733 total ^= 1 << ff_log2_tab[total];
734 while (n++ < read)
735 total = (total << 8) | avio_r8(pb);
736
737 *number = total;
738
739 return read;
740}
741
742/**
743 * Read a EBML length value.
744 * This needs special handling for the "unknown length" case which has multiple
745 * encodings.
746 */
747static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
748 uint64_t *number)
749{
750 int res = ebml_read_num(matroska, pb, 8, number);
751 if (res > 0 && *number + 1 == 1ULL << (7 * res))
752 *number = 0xffffffffffffffULL;
753 return res;
754}
755
756/*
757 * Read the next element as an unsigned int.
758 * 0 is success, < 0 is failure.
759 */
760static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
761{
762 int n = 0;
763
764 if (size > 8)
765 return AVERROR_INVALIDDATA;
766
767 /* big-endian ordering; build up number */
768 *num = 0;
769 while (n++ < size)
770 *num = (*num << 8) | avio_r8(pb);
771
772 return 0;
773}
774
775/*
776 * Read the next element as a signed int.
777 * 0 is success, < 0 is failure.
778 */
779static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
780{
781 int n = 1;
782
783 if (size > 8)
784 return AVERROR_INVALIDDATA;
785
786 if (size == 0) {
787 *num = 0;
788 } else {
789 *num = sign_extend(avio_r8(pb), 8);
790
791 /* big-endian ordering; build up number */
792 while (n++ < size)
793 *num = (*num << 8) | avio_r8(pb);
794 }
795
796 return 0;
797}
798
799/*
800 * Read the next element as a float.
801 * 0 is success, < 0 is failure.
802 */
803static int ebml_read_float(AVIOContext *pb, int size, double *num)
804{
805 if (size == 0)
806 *num = 0;
807 else if (size == 4)
808 *num = av_int2float(avio_rb32(pb));
809 else if (size == 8)
810 *num = av_int2double(avio_rb64(pb));
811 else
812 return AVERROR_INVALIDDATA;
813
814 return 0;
815}
816
817/*
818 * Read the next element as an ASCII string.
819 * 0 is success, < 0 is failure.
820 */
821static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
822{
823 char *res;
824
825 /* EBML strings are usually not 0-terminated, so we allocate one
826 * byte more, read the string and NULL-terminate it ourselves. */
827 if (!(res = av_malloc(size + 1)))
828 return AVERROR(ENOMEM);
829 if (avio_read(pb, (uint8_t *) res, size) != size) {
830 av_free(res);
831 return AVERROR(EIO);
832 }
833 (res)[size] = '\0';
834 av_free(*str);
835 *str = res;
836
837 return 0;
838}
839
840/*
841 * Read the next element as binary data.
842 * 0 is success, < 0 is failure.
843 */
844static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
845{
846 av_fast_padded_malloc(&bin->data, &bin->size, length);
847 if (!bin->data)
848 return AVERROR(ENOMEM);
849
850 bin->size = length;
851 bin->pos = avio_tell(pb);
852 if (avio_read(pb, bin->data, length) != length) {
853 av_freep(&bin->data);
854 bin->size = 0;
855 return AVERROR(EIO);
856 }
857
858 return 0;
859}
860
861/*
862 * Read the next element, but only the header. The contents
863 * are supposed to be sub-elements which can be read separately.
864 * 0 is success, < 0 is failure.
865 */
866static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
867{
868 AVIOContext *pb = matroska->ctx->pb;
869 MatroskaLevel *level;
870
871 if (matroska->num_levels >= EBML_MAX_DEPTH) {
872 av_log(matroska->ctx, AV_LOG_ERROR,
873 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
874 return AVERROR(ENOSYS);
875 }
876
877 level = &matroska->levels[matroska->num_levels++];
878 level->start = avio_tell(pb);
879 level->length = length;
880
881 return 0;
882}
883
884/*
885 * Read signed/unsigned "EBML" numbers.
886 * Return: number of bytes processed, < 0 on error
887 */
888static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
889 uint8_t *data, uint32_t size, uint64_t *num)
890{
891 AVIOContext pb;
892 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
893 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
894}
895
896/*
897 * Same as above, but signed.
898 */
899static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
900 uint8_t *data, uint32_t size, int64_t *num)
901{
902 uint64_t unum;
903 int res;
904
905 /* read as unsigned number first */
906 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
907 return res;
908
909 /* make signed (weird way) */
910 *num = unum - ((1LL << (7 * res - 1)) - 1);
911
912 return res;
913}
914
915static int ebml_parse_elem(MatroskaDemuxContext *matroska,
916 EbmlSyntax *syntax, void *data);
917
918static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
919 uint32_t id, void *data)
920{
921 int i;
922 for (i = 0; syntax[i].id; i++)
923 if (id == syntax[i].id)
924 break;
925 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
926 matroska->num_levels > 0 &&
927 matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
928 return 0; // we reached the end of an unknown size cluster
929 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
930 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%"PRIX32"\n", id);
931 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
932 return AVERROR_INVALIDDATA;
933 }
934 return ebml_parse_elem(matroska, &syntax[i], data);
935}
936
937static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
938 void *data)
939{
940 if (!matroska->current_id) {
941 uint64_t id;
942 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
943 if (res < 0)
944 return res;
945 matroska->current_id = id | 1 << 7 * res;
946 }
947 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
948}
949
950static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
951 void *data)
952{
953 int i, res = 0;
954
955 for (i = 0; syntax[i].id; i++)
956 switch (syntax[i].type) {
957 case EBML_UINT:
958 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
959 break;
960 case EBML_FLOAT:
961 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
962 break;
963 case EBML_STR:
964 case EBML_UTF8:
965 // the default may be NULL
966 if (syntax[i].def.s) {
967 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
968 *dst = av_strdup(syntax[i].def.s);
969 if (!*dst)
970 return AVERROR(ENOMEM);
971 }
972 break;
973 }
974
975 while (!res && !ebml_level_end(matroska))
976 res = ebml_parse(matroska, syntax, data);
977
978 return res;
979}
980
981static int ebml_parse_elem(MatroskaDemuxContext *matroska,
982 EbmlSyntax *syntax, void *data)
983{
984 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
985 [EBML_UINT] = 8,
986 [EBML_FLOAT] = 8,
987 // max. 16 MB for strings
988 [EBML_STR] = 0x1000000,
989 [EBML_UTF8] = 0x1000000,
990 // max. 256 MB for binary data
991 [EBML_BIN] = 0x10000000,
992 // no limits for anything else
993 };
994 AVIOContext *pb = matroska->ctx->pb;
995 uint32_t id = syntax->id;
996 uint64_t length;
997 int res;
998 void *newelem;
999
1000 data = (char *) data + syntax->data_offset;
1001 if (syntax->list_elem_size) {
1002 EbmlList *list = data;
1003 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1004 if (!newelem)
1005 return AVERROR(ENOMEM);
1006 list->elem = newelem;
1007 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1008 memset(data, 0, syntax->list_elem_size);
1009 list->nb_elem++;
1010 }
1011
1012 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1013 matroska->current_id = 0;
1014 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1015 return res;
1016 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1017 av_log(matroska->ctx, AV_LOG_ERROR,
1018 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1019 length, max_lengths[syntax->type], syntax->type);
1020 return AVERROR_INVALIDDATA;
1021 }
1022 }
1023
1024 switch (syntax->type) {
1025 case EBML_UINT:
1026 res = ebml_read_uint(pb, length, data);
1027 break;
1028 case EBML_SINT:
1029 res = ebml_read_sint(pb, length, data);
1030 break;
1031 case EBML_FLOAT:
1032 res = ebml_read_float(pb, length, data);
1033 break;
1034 case EBML_STR:
1035 case EBML_UTF8:
1036 res = ebml_read_ascii(pb, length, data);
1037 break;
1038 case EBML_BIN:
1039 res = ebml_read_binary(pb, length, data);
1040 break;
1041 case EBML_NEST:
1042 if ((res = ebml_read_master(matroska, length)) < 0)
1043 return res;
1044 if (id == MATROSKA_ID_SEGMENT)
1045 matroska->segment_start = avio_tell(matroska->ctx->pb);
1046 return ebml_parse_nest(matroska, syntax->def.n, data);
1047 case EBML_PASS:
1048 return ebml_parse_id(matroska, syntax->def.n, id, data);
1049 case EBML_STOP:
1050 return 1;
1051 default:
1052 if (ffio_limit(pb, length) != length)
1053 return AVERROR(EIO);
1054 return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1055 }
1056 if (res == AVERROR_INVALIDDATA)
1057 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1058 else if (res == AVERROR(EIO))
1059 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1060 return res;
1061}
1062
1063static void ebml_free(EbmlSyntax *syntax, void *data)
1064{
1065 int i, j;
1066 for (i = 0; syntax[i].id; i++) {
1067 void *data_off = (char *) data + syntax[i].data_offset;
1068 switch (syntax[i].type) {
1069 case EBML_STR:
1070 case EBML_UTF8:
1071 av_freep(data_off);
1072 break;
1073 case EBML_BIN:
1074 av_freep(&((EbmlBin *) data_off)->data);
1075 break;
1076 case EBML_NEST:
1077 if (syntax[i].list_elem_size) {
1078 EbmlList *list = data_off;
1079 char *ptr = list->elem;
1080 for (j = 0; j < list->nb_elem;
1081 j++, ptr += syntax[i].list_elem_size)
1082 ebml_free(syntax[i].def.n, ptr);
1083 av_free(list->elem);
1084 } else
1085 ebml_free(syntax[i].def.n, data_off);
1086 default:
1087 break;
1088 }
1089 }
1090}
1091
1092/*
1093 * Autodetecting...
1094 */
1095static int matroska_probe(AVProbeData *p)
1096{
1097 uint64_t total = 0;
1098 int len_mask = 0x80, size = 1, n = 1, i;
1099
1100 /* EBML header? */
1101 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1102 return 0;
1103
1104 /* length of header */
1105 total = p->buf[4];
1106 while (size <= 8 && !(total & len_mask)) {
1107 size++;
1108 len_mask >>= 1;
1109 }
1110 if (size > 8)
1111 return 0;
1112 total &= (len_mask - 1);
1113 while (n < size)
1114 total = (total << 8) | p->buf[4 + n++];
1115
1116 /* Does the probe data contain the whole header? */
1117 if (p->buf_size < 4 + size + total)
1118 return 0;
1119
1120 /* The header should contain a known document type. For now,
1121 * we don't parse the whole header but simply check for the
1122 * availability of that array of characters inside the header.
1123 * Not fully fool-proof, but good enough. */
1124 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1125 int probelen = strlen(matroska_doctypes[i]);
1126 if (total < probelen)
1127 continue;
1128 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1129 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1130 return AVPROBE_SCORE_MAX;
1131 }
1132
1133 // probably valid EBML header but no recognized doctype
1134 return AVPROBE_SCORE_EXTENSION;
1135}
1136
1137static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1138 int num)
1139{
1140 MatroskaTrack *tracks = matroska->tracks.elem;
1141 int i;
1142
1143 for (i = 0; i < matroska->tracks.nb_elem; i++)
1144 if (tracks[i].num == num)
1145 return &tracks[i];
1146
1147 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1148 return NULL;
1149}
1150
1151static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1152 MatroskaTrack *track)
1153{
1154 MatroskaTrackEncoding *encodings = track->encodings.elem;
1155 uint8_t *data = *buf;
1156 int isize = *buf_size;
1157 uint8_t *pkt_data = NULL;
1158 uint8_t av_unused *newpktdata;
1159 int pkt_size = isize;
1160 int result = 0;
1161 int olen;
1162
1163 if (pkt_size >= 10000000U)
1164 return AVERROR_INVALIDDATA;
1165
1166 switch (encodings[0].compression.algo) {
1167 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1168 {
1169 int header_size = encodings[0].compression.settings.size;
1170 uint8_t *header = encodings[0].compression.settings.data;
1171
1172 if (header_size && !header) {
1173 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1174 return -1;
1175 }
1176
1177 if (!header_size)
1178 return 0;
1179
1180 pkt_size = isize + header_size;
1181 pkt_data = av_malloc(pkt_size);
1182 if (!pkt_data)
1183 return AVERROR(ENOMEM);
1184
1185 memcpy(pkt_data, header, header_size);
1186 memcpy(pkt_data + header_size, data, isize);
1187 break;
1188 }
1189#if CONFIG_LZO
1190 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1191 do {
1192 olen = pkt_size *= 3;
1193 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1194 if (!newpktdata) {
1195 result = AVERROR(ENOMEM);
1196 goto failed;
1197 }
1198 pkt_data = newpktdata;
1199 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1200 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1201 if (result) {
1202 result = AVERROR_INVALIDDATA;
1203 goto failed;
1204 }
1205 pkt_size -= olen;
1206 break;
1207#endif
1208#if CONFIG_ZLIB
1209 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1210 {
1211 z_stream zstream = { 0 };
1212 if (inflateInit(&zstream) != Z_OK)
1213 return -1;
1214 zstream.next_in = data;
1215 zstream.avail_in = isize;
1216 do {
1217 pkt_size *= 3;
1218 newpktdata = av_realloc(pkt_data, pkt_size);
1219 if (!newpktdata) {
1220 inflateEnd(&zstream);
1221 goto failed;
1222 }
1223 pkt_data = newpktdata;
1224 zstream.avail_out = pkt_size - zstream.total_out;
1225 zstream.next_out = pkt_data + zstream.total_out;
1226 if (pkt_data) {
1227 result = inflate(&zstream, Z_NO_FLUSH);
1228 } else
1229 result = Z_MEM_ERROR;
1230 } while (result == Z_OK && pkt_size < 10000000);
1231 pkt_size = zstream.total_out;
1232 inflateEnd(&zstream);
1233 if (result != Z_STREAM_END) {
1234 if (result == Z_MEM_ERROR)
1235 result = AVERROR(ENOMEM);
1236 else
1237 result = AVERROR_INVALIDDATA;
1238 goto failed;
1239 }
1240 break;
1241 }
1242#endif
1243#if CONFIG_BZLIB
1244 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1245 {
1246 bz_stream bzstream = { 0 };
1247 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1248 return -1;
1249 bzstream.next_in = data;
1250 bzstream.avail_in = isize;
1251 do {
1252 pkt_size *= 3;
1253 newpktdata = av_realloc(pkt_data, pkt_size);
1254 if (!newpktdata) {
1255 BZ2_bzDecompressEnd(&bzstream);
1256 goto failed;
1257 }
1258 pkt_data = newpktdata;
1259 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1260 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1261 if (pkt_data) {
1262 result = BZ2_bzDecompress(&bzstream);
1263 } else
1264 result = BZ_MEM_ERROR;
1265 } while (result == BZ_OK && pkt_size < 10000000);
1266 pkt_size = bzstream.total_out_lo32;
1267 BZ2_bzDecompressEnd(&bzstream);
1268 if (result != BZ_STREAM_END) {
1269 if (result == BZ_MEM_ERROR)
1270 result = AVERROR(ENOMEM);
1271 else
1272 result = AVERROR_INVALIDDATA;
1273 goto failed;
1274 }
1275 break;
1276 }
1277#endif
1278 default:
1279 return AVERROR_INVALIDDATA;
1280 }
1281
1282 *buf = pkt_data;
1283 *buf_size = pkt_size;
1284 return 0;
1285
1286failed:
1287 av_free(pkt_data);
1288 return result;
1289}
1290
1291static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1292 AVDictionary **metadata, char *prefix)
1293{
1294 MatroskaTag *tags = list->elem;
1295 char key[1024];
1296 int i;
1297
1298 for (i = 0; i < list->nb_elem; i++) {
1299 const char *lang = tags[i].lang &&
1300 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1301
1302 if (!tags[i].name) {
1303 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1304 continue;
1305 }
1306 if (prefix)
1307 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1308 else
1309 av_strlcpy(key, tags[i].name, sizeof(key));
1310 if (tags[i].def || !lang) {
1311 av_dict_set(metadata, key, tags[i].string, 0);
1312 if (tags[i].sub.nb_elem)
1313 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1314 }
1315 if (lang) {
1316 av_strlcat(key, "-", sizeof(key));
1317 av_strlcat(key, lang, sizeof(key));
1318 av_dict_set(metadata, key, tags[i].string, 0);
1319 if (tags[i].sub.nb_elem)
1320 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1321 }
1322 }
1323 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1324}
1325
1326static void matroska_convert_tags(AVFormatContext *s)
1327{
1328 MatroskaDemuxContext *matroska = s->priv_data;
1329 MatroskaTags *tags = matroska->tags.elem;
1330 int i, j;
1331
1332 for (i = 0; i < matroska->tags.nb_elem; i++) {
1333 if (tags[i].target.attachuid) {
1334 MatroskaAttachment *attachment = matroska->attachments.elem;
1335 for (j = 0; j < matroska->attachments.nb_elem; j++)
1336 if (attachment[j].uid == tags[i].target.attachuid &&
1337 attachment[j].stream)
1338 matroska_convert_tag(s, &tags[i].tag,
1339 &attachment[j].stream->metadata, NULL);
1340 } else if (tags[i].target.chapteruid) {
1341 MatroskaChapter *chapter = matroska->chapters.elem;
1342 for (j = 0; j < matroska->chapters.nb_elem; j++)
1343 if (chapter[j].uid == tags[i].target.chapteruid &&
1344 chapter[j].chapter)
1345 matroska_convert_tag(s, &tags[i].tag,
1346 &chapter[j].chapter->metadata, NULL);
1347 } else if (tags[i].target.trackuid) {
1348 MatroskaTrack *track = matroska->tracks.elem;
1349 for (j = 0; j < matroska->tracks.nb_elem; j++)
1350 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1351 matroska_convert_tag(s, &tags[i].tag,
1352 &track[j].stream->metadata, NULL);
1353 } else {
1354 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1355 tags[i].target.type);
1356 }
1357 }
1358}
1359
1360static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1361 int idx)
1362{
1363 EbmlList *seekhead_list = &matroska->seekhead;
1364 uint32_t level_up = matroska->level_up;
1365 uint32_t saved_id = matroska->current_id;
1366 MatroskaSeekhead *seekhead = seekhead_list->elem;
1367 int64_t before_pos = avio_tell(matroska->ctx->pb);
1368 MatroskaLevel level;
1369 int64_t offset;
1370 int ret = 0;
1371
1372 if (idx >= seekhead_list->nb_elem ||
1373 seekhead[idx].id == MATROSKA_ID_SEEKHEAD ||
1374 seekhead[idx].id == MATROSKA_ID_CLUSTER)
1375 return 0;
1376
1377 /* seek */
1378 offset = seekhead[idx].pos + matroska->segment_start;
1379 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1380 /* We don't want to lose our seekhead level, so we add
1381 * a dummy. This is a crude hack. */
1382 if (matroska->num_levels == EBML_MAX_DEPTH) {
1383 av_log(matroska->ctx, AV_LOG_INFO,
1384 "Max EBML element depth (%d) reached, "
1385 "cannot parse further.\n", EBML_MAX_DEPTH);
1386 ret = AVERROR_INVALIDDATA;
1387 } else {
1388 level.start = 0;
1389 level.length = (uint64_t) -1;
1390 matroska->levels[matroska->num_levels] = level;
1391 matroska->num_levels++;
1392 matroska->current_id = 0;
1393
1394 ret = ebml_parse(matroska, matroska_segment, matroska);
1395
1396 /* remove dummy level */
1397 while (matroska->num_levels) {
1398 uint64_t length = matroska->levels[--matroska->num_levels].length;
1399 if (length == (uint64_t) -1)
1400 break;
1401 }
1402 }
1403 }
1404 /* seek back */
1405 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1406 matroska->level_up = level_up;
1407 matroska->current_id = saved_id;
1408
1409 return ret;
1410}
1411
1412static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1413{
1414 EbmlList *seekhead_list = &matroska->seekhead;
1415 int64_t before_pos = avio_tell(matroska->ctx->pb);
1416 int i;
1417
1418 // we should not do any seeking in the streaming case
1419 if (!matroska->ctx->pb->seekable ||
1420 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1421 return;
1422
1423 for (i = 0; i < seekhead_list->nb_elem; i++) {
1424 MatroskaSeekhead *seekhead = seekhead_list->elem;
1425 if (seekhead[i].pos <= before_pos)
1426 continue;
1427
1428 // defer cues parsing until we actually need cue data.
1429 if (seekhead[i].id == MATROSKA_ID_CUES) {
1430 matroska->cues_parsing_deferred = 1;
1431 continue;
1432 }
1433
1434 if (matroska_parse_seekhead_entry(matroska, i) < 0) {
1435 // mark index as broken
1436 matroska->cues_parsing_deferred = -1;
1437 break;
1438 }
1439 }
1440}
1441
1442static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1443{
1444 EbmlList *index_list;
1445 MatroskaIndex *index;
1446 int index_scale = 1;
1447 int i, j;
1448
1449 index_list = &matroska->index;
1450 index = index_list->elem;
1451 if (index_list->nb_elem &&
1452 index[0].time > 1E14 / matroska->time_scale) {
1453 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1454 index_scale = matroska->time_scale;
1455 }
1456 for (i = 0; i < index_list->nb_elem; i++) {
1457 EbmlList *pos_list = &index[i].pos;
1458 MatroskaIndexPos *pos = pos_list->elem;
1459 for (j = 0; j < pos_list->nb_elem; j++) {
1460 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1461 pos[j].track);
1462 if (track && track->stream)
1463 av_add_index_entry(track->stream,
1464 pos[j].pos + matroska->segment_start,
1465 index[i].time / index_scale, 0, 0,
1466 AVINDEX_KEYFRAME);
1467 }
1468 }
1469}
1470
1471static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1472 EbmlList *seekhead_list = &matroska->seekhead;
1473 MatroskaSeekhead *seekhead = seekhead_list->elem;
1474 int i;
1475
1476 for (i = 0; i < seekhead_list->nb_elem; i++)
1477 if (seekhead[i].id == MATROSKA_ID_CUES)
1478 break;
1479 av_assert1(i <= seekhead_list->nb_elem);
1480
1481 if (matroska_parse_seekhead_entry(matroska, i) < 0)
1482 matroska->cues_parsing_deferred = -1;
1483 matroska_add_index_entries(matroska);
1484}
1485
1486static int matroska_aac_profile(char *codec_id)
1487{
1488 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1489 int profile;
1490
1491 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1492 if (strstr(codec_id, aac_profiles[profile]))
1493 break;
1494 return profile + 1;
1495}
1496
1497static int matroska_aac_sri(int samplerate)
1498{
1499 int sri;
1500
1501 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1502 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1503 break;
1504 return sri;
1505}
1506
1507static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1508{
1509 char buffer[32];
1510 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1511 time_t creation_time = date_utc / 1000000000 + 978307200;
f6fa7814 1512 struct tm tmpbuf, *ptm = gmtime_r(&creation_time, &tmpbuf);
2ba45a60 1513 if (!ptm) return;
f6fa7814
DM		 1514 if (strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm))
1515 av_dict_set(metadata, "creation_time", buffer, 0);
2ba45a60
DM		 1516}
1517
1518static int matroska_parse_flac(AVFormatContext *s,
1519 MatroskaTrack *track,
1520 int *offset)
1521{
1522 AVStream *st = track->stream;
1523 uint8_t *p = track->codec_priv.data;
1524 int size = track->codec_priv.size;
1525
1526 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1527 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1528 track->codec_priv.size = 0;
1529 return 0;
1530 }
1531 *offset = 8;
1532 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1533
1534 p += track->codec_priv.size;
1535 size -= track->codec_priv.size;
1536
1537 /* parse the remaining metadata blocks if present */
1538 while (size >= 4) {
1539 int block_last, block_type, block_size;
1540
1541 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1542
1543 p += 4;
1544 size -= 4;
1545 if (block_size > size)
1546 return 0;
1547
1548 /* check for the channel mask */
1549 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1550 AVDictionary *dict = NULL;
1551 AVDictionaryEntry *chmask;
1552
1553 ff_vorbis_comment(s, &dict, p, block_size, 0);
1554 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1555 if (chmask) {
1556 uint64_t mask = strtol(chmask->value, NULL, 0);
1557 if (!mask || mask & ~0x3ffffULL) {
1558 av_log(s, AV_LOG_WARNING,
1559 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1560 } else
1561 st->codec->channel_layout = mask;
1562 }
1563 av_dict_free(&dict);
1564 }
1565
1566 p += block_size;
1567 size -= block_size;
1568 }
1569
1570 return 0;
1571}
1572
1573static int matroska_parse_tracks(AVFormatContext *s)
1574{
1575 MatroskaDemuxContext *matroska = s->priv_data;
1576 MatroskaTrack *tracks = matroska->tracks.elem;
1577 AVStream *st;
1578 int i, j, ret;
1579 int k;
1580
1581 for (i = 0; i < matroska->tracks.nb_elem; i++) {
1582 MatroskaTrack *track = &tracks[i];
1583 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1584 EbmlList *encodings_list = &track->encodings;
1585 MatroskaTrackEncoding *encodings = encodings_list->elem;
1586 uint8_t *extradata = NULL;
1587 int extradata_size = 0;
1588 int extradata_offset = 0;
1589 uint32_t fourcc = 0;
1590 AVIOContext b;
1591 char* key_id_base64 = NULL;
1592 int bit_depth = -1;
1593
1594 /* Apply some sanity checks. */
1595 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1596 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1597 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1598 track->type != MATROSKA_TRACK_TYPE_METADATA) {
1599 av_log(matroska->ctx, AV_LOG_INFO,
1600 "Unknown or unsupported track type %"PRIu64"\n",
1601 track->type);
1602 continue;
1603 }
1604 if (!track->codec_id)
1605 continue;
1606
1607 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1608 if (!track->default_duration && track->video.frame_rate > 0)
1609 track->default_duration = 1000000000 / track->video.frame_rate;
1610 if (track->video.display_width == -1)
1611 track->video.display_width = track->video.pixel_width;
1612 if (track->video.display_height == -1)
1613 track->video.display_height = track->video.pixel_height;
1614 if (track->video.color_space.size == 4)
1615 fourcc = AV_RL32(track->video.color_space.data);
1616 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1617 if (!track->audio.out_samplerate)
1618 track->audio.out_samplerate = track->audio.samplerate;
1619 }
1620 if (encodings_list->nb_elem > 1) {
1621 av_log(matroska->ctx, AV_LOG_ERROR,
1622 "Multiple combined encodings not supported");
1623 } else if (encodings_list->nb_elem == 1) {
1624 if (encodings[0].type) {
1625 if (encodings[0].encryption.key_id.size > 0) {
1626 /* Save the encryption key id to be stored later as a
1627 metadata tag. */
1628 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1629 key_id_base64 = av_malloc(b64_size);
1630 if (key_id_base64 == NULL)
1631 return AVERROR(ENOMEM);
1632
1633 av_base64_encode(key_id_base64, b64_size,
1634 encodings[0].encryption.key_id.data,
1635 encodings[0].encryption.key_id.size);
1636 } else {
1637 encodings[0].scope = 0;
1638 av_log(matroska->ctx, AV_LOG_ERROR,
1639 "Unsupported encoding type");
1640 }
1641 } else if (
1642#if CONFIG_ZLIB
1643 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1644#endif
1645#if CONFIG_BZLIB
1646 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1647#endif
1648#if CONFIG_LZO
1649 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1650#endif
1651 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
1652 encodings[0].scope = 0;
1653 av_log(matroska->ctx, AV_LOG_ERROR,
1654 "Unsupported encoding type");
1655 } else if (track->codec_priv.size && encodings[0].scope & 2) {
1656 uint8_t *codec_priv = track->codec_priv.data;
1657 int ret = matroska_decode_buffer(&track->codec_priv.data,
1658 &track->codec_priv.size,
1659 track);
1660 if (ret < 0) {
1661 track->codec_priv.data = NULL;
1662 track->codec_priv.size = 0;
1663 av_log(matroska->ctx, AV_LOG_ERROR,
1664 "Failed to decode codec private data\n");
1665 }
1666
1667 if (codec_priv != track->codec_priv.data)
1668 av_free(codec_priv);
1669 }
1670 }
1671
1672 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1673 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1674 strlen(ff_mkv_codec_tags[j].str))) {
1675 codec_id = ff_mkv_codec_tags[j].id;
1676 break;
1677 }
1678 }
1679
1680 st = track->stream = avformat_new_stream(s, NULL);
1681 if (!st) {
1682 av_free(key_id_base64);
1683 return AVERROR(ENOMEM);
1684 }
1685
1686 if (key_id_base64) {
1687 /* export encryption key id as base64 metadata tag */
1688 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1689 av_freep(&key_id_base64);
1690 }
1691
1692 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1693 track->codec_priv.size >= 40 &&
1694 track->codec_priv.data) {
1695 track->ms_compat = 1;
1696 bit_depth = AV_RL16(track->codec_priv.data + 14);
1697 fourcc = AV_RL32(track->codec_priv.data + 16);
1698 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
1699 fourcc);
1700 if (!codec_id)
1701 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
1702 fourcc);
1703 extradata_offset = 40;
1704 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1705 track->codec_priv.size >= 14 &&
1706 track->codec_priv.data) {
1707 int ret;
1708 ffio_init_context(&b, track->codec_priv.data,
1709 track->codec_priv.size,
1710 0, NULL, NULL, NULL, NULL);
1711 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1712 if (ret < 0)
1713 return ret;
1714 codec_id = st->codec->codec_id;
1715 extradata_offset = FFMIN(track->codec_priv.size, 18);
1716 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1717 && (track->codec_priv.size >= 86)
1718 && (track->codec_priv.data)) {
1719 fourcc = AV_RL32(track->codec_priv.data + 4);
1720 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1721 if (ff_codec_get_id(ff_codec_movaudio_tags, AV_RL32(track->codec_priv.data))) {
1722 fourcc = AV_RL32(track->codec_priv.data);
1723 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1724 }
1725 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1726 (track->codec_priv.size >= 21) &&
1727 (track->codec_priv.data)) {
1728 fourcc = AV_RL32(track->codec_priv.data + 4);
1729 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1730 if (ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(track->codec_priv.data))) {
1731 fourcc = AV_RL32(track->codec_priv.data);
1732 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1733 }
1734 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1735 codec_id = AV_CODEC_ID_SVQ3;
1736 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1737 switch (track->audio.bitdepth) {
1738 case 8:
1739 codec_id = AV_CODEC_ID_PCM_U8;
1740 break;
1741 case 24:
1742 codec_id = AV_CODEC_ID_PCM_S24BE;
1743 break;
1744 case 32:
1745 codec_id = AV_CODEC_ID_PCM_S32BE;
1746 break;
1747 }
1748 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1749 switch (track->audio.bitdepth) {
1750 case 8:
1751 codec_id = AV_CODEC_ID_PCM_U8;
1752 break;
1753 case 24:
1754 codec_id = AV_CODEC_ID_PCM_S24LE;
1755 break;
1756 case 32:
1757 codec_id = AV_CODEC_ID_PCM_S32LE;
1758 break;
1759 }
1760 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1761 track->audio.bitdepth == 64) {
1762 codec_id = AV_CODEC_ID_PCM_F64LE;
1763 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1764 int profile = matroska_aac_profile(track->codec_id);
1765 int sri = matroska_aac_sri(track->audio.samplerate);
1766 extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1767 if (!extradata)
1768 return AVERROR(ENOMEM);
1769 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1770 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1771 if (strstr(track->codec_id, "SBR")) {
1772 sri = matroska_aac_sri(track->audio.out_samplerate);
1773 extradata[2] = 0x56;
1774 extradata[3] = 0xE5;
1775 extradata[4] = 0x80 | (sri << 3);
1776 extradata_size = 5;
1777 } else
1778 extradata_size = 2;
1779 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1780 /* Only ALAC's magic cookie is stored in Matroska's track headers.
1781 * Create the "atom size", "tag", and "tag version" fields the
1782 * decoder expects manually. */
1783 extradata_size = 12 + track->codec_priv.size;
1784 extradata = av_mallocz(extradata_size +
1785 FF_INPUT_BUFFER_PADDING_SIZE);
1786 if (!extradata)
1787 return AVERROR(ENOMEM);
1788 AV_WB32(extradata, extradata_size);
1789 memcpy(&extradata[4], "alac", 4);
1790 AV_WB32(&extradata[8], 0);
1791 memcpy(&extradata[12], track->codec_priv.data,
1792 track->codec_priv.size);
1793 } else if (codec_id == AV_CODEC_ID_TTA) {
1794 extradata_size = 30;
1795 extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1796 if (!extradata)
1797 return AVERROR(ENOMEM);
1798 ffio_init_context(&b, extradata, extradata_size, 1,
1799 NULL, NULL, NULL, NULL);
1800 avio_write(&b, "TTA1", 4);
1801 avio_wl16(&b, 1);
1802 avio_wl16(&b, track->audio.channels);
1803 avio_wl16(&b, track->audio.bitdepth);
1804 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1805 return AVERROR_INVALIDDATA;
1806 avio_wl32(&b, track->audio.out_samplerate);
1807 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1808 track->audio.out_samplerate,
1809 AV_TIME_BASE * 1000));
1810 } else if (codec_id == AV_CODEC_ID_RV10 ||
1811 codec_id == AV_CODEC_ID_RV20 ||
1812 codec_id == AV_CODEC_ID_RV30 ||
1813 codec_id == AV_CODEC_ID_RV40) {
1814 extradata_offset = 26;
1815 } else if (codec_id == AV_CODEC_ID_RA_144) {
1816 track->audio.out_samplerate = 8000;
1817 track->audio.channels = 1;
1818 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1819 codec_id == AV_CODEC_ID_COOK ||
1820 codec_id == AV_CODEC_ID_ATRAC3 ||
1821 codec_id == AV_CODEC_ID_SIPR)
1822 && track->codec_priv.data) {
1823 int flavor;
1824
1825 ffio_init_context(&b, track->codec_priv.data,
1826 track->codec_priv.size,
1827 0, NULL, NULL, NULL, NULL);
1828 avio_skip(&b, 22);
1829 flavor = avio_rb16(&b);
1830 track->audio.coded_framesize = avio_rb32(&b);
1831 avio_skip(&b, 12);
1832 track->audio.sub_packet_h = avio_rb16(&b);
1833 track->audio.frame_size = avio_rb16(&b);
1834 track->audio.sub_packet_size = avio_rb16(&b);
1835 if (flavor < 0 ||
1836 track->audio.coded_framesize <= 0 ||
1837 track->audio.sub_packet_h <= 0 ||
1838 track->audio.frame_size <= 0 ||
1839 track->audio.sub_packet_size <= 0)
1840 return AVERROR_INVALIDDATA;
1841 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1842 track->audio.frame_size);
1843 if (!track->audio.buf)
1844 return AVERROR(ENOMEM);
1845 if (codec_id == AV_CODEC_ID_RA_288) {
1846 st->codec->block_align = track->audio.coded_framesize;
1847 track->codec_priv.size = 0;
1848 } else {
1849 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1850 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1851 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1852 st->codec->bit_rate = sipr_bit_rate[flavor];
1853 }
1854 st->codec->block_align = track->audio.sub_packet_size;
1855 extradata_offset = 78;
1856 }
1857 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
1858 ret = matroska_parse_flac(s, track, &extradata_offset);
1859 if (ret < 0)
1860 return ret;
1861 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1862 fourcc = AV_RL32(track->codec_priv.data);
1863 }
1864 track->codec_priv.size -= extradata_offset;
1865
1866 if (codec_id == AV_CODEC_ID_NONE)
1867 av_log(matroska->ctx, AV_LOG_INFO,
1868 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1869
1870 if (track->time_scale < 0.01)
1871 track->time_scale = 1.0;
1872 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1873 1000 * 1000 * 1000); /* 64 bit pts in ns */
1874
1875 /* convert the delay from ns to the track timebase */
1876 track->codec_delay = av_rescale_q(track->codec_delay,
1877 (AVRational){ 1, 1000000000 },
1878 st->time_base);
1879
1880 st->codec->codec_id = codec_id;
1881
1882 if (strcmp(track->language, "und"))
1883 av_dict_set(&st->metadata, "language", track->language, 0);
1884 av_dict_set(&st->metadata, "title", track->name, 0);
1885
1886 if (track->flag_default)
1887 st->disposition |= AV_DISPOSITION_DEFAULT;
1888 if (track->flag_forced)
1889 st->disposition |= AV_DISPOSITION_FORCED;
1890
1891 if (!st->codec->extradata) {
1892 if (extradata) {
1893 st->codec->extradata = extradata;
1894 st->codec->extradata_size = extradata_size;
1895 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1896 if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1897 return AVERROR(ENOMEM);
1898 memcpy(st->codec->extradata,
1899 track->codec_priv.data + extradata_offset,
1900 track->codec_priv.size);
1901 }
1902 }
1903
1904 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1905 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1906
1907 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1908 st->codec->codec_tag = fourcc;
1909 if (bit_depth >= 0)
1910 st->codec->bits_per_coded_sample = bit_depth;
1911 st->codec->width = track->video.pixel_width;
1912 st->codec->height = track->video.pixel_height;
1913 av_reduce(&st->sample_aspect_ratio.num,
1914 &st->sample_aspect_ratio.den,
1915 st->codec->height * track->video.display_width,
1916 st->codec->width * track->video.display_height,
1917 255);
1918 if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1919 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1920
1921 if (track->default_duration) {
1922 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1923 1000000000, track->default_duration, 30000);
1924#if FF_API_R_FRAME_RATE
1925 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L
1926 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5L)
1927 st->r_frame_rate = st->avg_frame_rate;
1928#endif
1929 }
1930
1931 /* export stereo mode flag as metadata tag */
1932 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1933 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
1934
1935 /* export alpha mode flag as metadata tag */
1936 if (track->video.alpha_mode)
1937 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
1938
1939 /* if we have virtual track, mark the real tracks */
1940 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
1941 char buf[32];
1942 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
1943 continue;
1944 snprintf(buf, sizeof(buf), "%s_%d",
1945 ff_matroska_video_stereo_plane[planes[j].type], i);
1946 for (k=0; k < matroska->tracks.nb_elem; k++)
1947 if (planes[j].uid == tracks[k].uid) {
1948 av_dict_set(&s->streams[k]->metadata,
1949 "stereo_mode", buf, 0);
1950 break;
1951 }
1952 }
1953 // add stream level stereo3d side data if it is a supported format
1954 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1955 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
1956 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
1957 if (ret < 0)
1958 return ret;
1959 }
1960 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1961 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1962 st->codec->sample_rate = track->audio.out_samplerate;
1963 st->codec->channels = track->audio.channels;
1964 if (!st->codec->bits_per_coded_sample)
1965 st->codec->bits_per_coded_sample = track->audio.bitdepth;
1966 if (st->codec->codec_id != AV_CODEC_ID_AAC)
1967 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1968 if (track->codec_delay > 0) {
1969 st->codec->delay = av_rescale_q(track->codec_delay,
1970 st->time_base,
1971 (AVRational){1, st->codec->sample_rate});
1972 }
1973 if (track->seek_preroll > 0) {
1974 av_codec_set_seek_preroll(st->codec,
1975 av_rescale_q(track->seek_preroll,
1976 (AVRational){1, 1000000000},
1977 (AVRational){1, st->codec->sample_rate}));
1978 }
1979 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
1980 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1981
1982 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
1983 st->disposition |= AV_DISPOSITION_CAPTIONS;
1984 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
1985 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1986 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
1987 st->disposition |= AV_DISPOSITION_METADATA;
1988 }
1989 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1990 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1991 if (st->codec->codec_id == AV_CODEC_ID_ASS)
1992 matroska->contains_ssa = 1;
1993 }
1994 }
1995
1996 return 0;
1997}
1998
1999static int matroska_read_header(AVFormatContext *s)
2000{
2001 MatroskaDemuxContext *matroska = s->priv_data;
2002 EbmlList *attachments_list = &matroska->attachments;
2003 EbmlList *chapters_list = &matroska->chapters;
2004 MatroskaAttachment *attachments;
2005 MatroskaChapter *chapters;
2006 uint64_t max_start = 0;
2007 int64_t pos;
2008 Ebml ebml = { 0 };
2009 int i, j, res;
2010
2011 matroska->ctx = s;
2012
2013 /* First read the EBML header. */
2014 if (ebml_parse(matroska, ebml_syntax, &ebml) ||
2015 ebml.version > EBML_VERSION ||
2016 ebml.max_size > sizeof(uint64_t) ||
2017 ebml.id_length > sizeof(uint32_t) ||
2018 ebml.doctype_version > 3 ||
2019 !ebml.doctype) {
2020 av_log(matroska->ctx, AV_LOG_ERROR,
2021 "EBML header using unsupported features\n"
2022 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2023 ebml.version, ebml.doctype, ebml.doctype_version);
2024 ebml_free(ebml_syntax, &ebml);
2025 return AVERROR_PATCHWELCOME;
2026 } else if (ebml.doctype_version == 3) {
2027 av_log(matroska->ctx, AV_LOG_WARNING,
2028 "EBML header using unsupported features\n"
2029 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2030 ebml.version, ebml.doctype, ebml.doctype_version);
2031 }
2032 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2033 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2034 break;
2035 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2036 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2037 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2038 ebml_free(ebml_syntax, &ebml);
2039 return AVERROR_INVALIDDATA;
2040 }
2041 }
2042 ebml_free(ebml_syntax, &ebml);
2043
2044 /* The next thing is a segment. */
2045 pos = avio_tell(matroska->ctx->pb);
2046 res = ebml_parse(matroska, matroska_segments, matroska);
2047 // try resyncing until we find a EBML_STOP type element.
2048 while (res != 1) {
2049 res = matroska_resync(matroska, pos);
2050 if (res < 0)
2051 return res;
2052 pos = avio_tell(matroska->ctx->pb);
2053 res = ebml_parse(matroska, matroska_segment, matroska);
2054 }
2055 matroska_execute_seekhead(matroska);
2056
2057 if (!matroska->time_scale)
2058 matroska->time_scale = 1000000;
2059 if (matroska->duration)
2060 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2061 1000 / AV_TIME_BASE;
2062 av_dict_set(&s->metadata, "title", matroska->title, 0);
2063 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2064
2065 if (matroska->date_utc.size == 8)
2066 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2067
2068 res = matroska_parse_tracks(s);
2069 if (res < 0)
2070 return res;
2071
2072 attachments = attachments_list->elem;
2073 for (j = 0; j < attachments_list->nb_elem; j++) {
2074 if (!(attachments[j].filename && attachments[j].mime &&
2075 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2076 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2077 } else {
2078 AVStream *st = avformat_new_stream(s, NULL);
2079 if (!st)
2080 break;
2081 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2082 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2083 st->codec->codec_id = AV_CODEC_ID_NONE;
2084 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2085 if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2086 break;
2087 memcpy(st->codec->extradata, attachments[j].bin.data,
2088 attachments[j].bin.size);
2089
2090 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2091 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2092 strlen(ff_mkv_mime_tags[i].str))) {
2093 st->codec->codec_id = ff_mkv_mime_tags[i].id;
2094 break;
2095 }
2096 }
2097 attachments[j].stream = st;
2098 }
2099 }
2100
2101 chapters = chapters_list->elem;
2102 for (i = 0; i < chapters_list->nb_elem; i++)
2103 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2104 (max_start == 0 || chapters[i].start > max_start)) {
2105 chapters[i].chapter =
2106 avpriv_new_chapter(s, chapters[i].uid,
2107 (AVRational) { 1, 1000000000 },
2108 chapters[i].start, chapters[i].end,
2109 chapters[i].title);
2110 if (chapters[i].chapter) {
2111 av_dict_set(&chapters[i].chapter->metadata,
2112 "title", chapters[i].title, 0);
2113 }
2114 max_start = chapters[i].start;
2115 }
2116
2117 matroska_add_index_entries(matroska);
2118
2119 matroska_convert_tags(s);
2120
2121 return 0;
2122}
2123
2124/*
2125 * Put one packet in an application-supplied AVPacket struct.
2126 * Returns 0 on success or -1 on failure.
2127 */
2128static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2129 AVPacket *pkt)
2130{
2131 if (matroska->num_packets > 0) {
2132 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2133 av_free(matroska->packets[0]);
2134 if (matroska->num_packets > 1) {
2135 void *newpackets;
2136 memmove(&matroska->packets[0], &matroska->packets[1],
2137 (matroska->num_packets - 1) * sizeof(AVPacket *));
2138 newpackets = av_realloc(matroska->packets,
2139 (matroska->num_packets - 1) *
2140 sizeof(AVPacket *));
2141 if (newpackets)
2142 matroska->packets = newpackets;
2143 } else {
2144 av_freep(&matroska->packets);
2145 matroska->prev_pkt = NULL;
2146 }
2147 matroska->num_packets--;
2148 return 0;
2149 }
2150
2151 return -1;
2152}
2153
2154/*
2155 * Free all packets in our internal queue.
2156 */
2157static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2158{
2159 matroska->prev_pkt = NULL;
2160 if (matroska->packets) {
2161 int n;
2162 for (n = 0; n < matroska->num_packets; n++) {
2163 av_free_packet(matroska->packets[n]);
2164 av_free(matroska->packets[n]);
2165 }
2166 av_freep(&matroska->packets);
2167 matroska->num_packets = 0;
2168 }
2169}
2170
2171static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2172 int *buf_size, int type,
2173 uint32_t **lace_buf, int *laces)
2174{
2175 int res = 0, n, size = *buf_size;
2176 uint8_t *data = *buf;
2177 uint32_t *lace_size;
2178
2179 if (!type) {
2180 *laces = 1;
2181 *lace_buf = av_mallocz(sizeof(int));
2182 if (!*lace_buf)
2183 return AVERROR(ENOMEM);
2184
2185 *lace_buf[0] = size;
2186 return 0;
2187 }
2188
2189 av_assert0(size > 0);
2190 *laces = *data + 1;
2191 data += 1;
2192 size -= 1;
2193 lace_size = av_mallocz(*laces * sizeof(int));
2194 if (!lace_size)
2195 return AVERROR(ENOMEM);
2196
2197 switch (type) {
2198 case 0x1: /* Xiph lacing */
2199 {
2200 uint8_t temp;
2201 uint32_t total = 0;
2202 for (n = 0; res == 0 && n < *laces - 1; n++) {
2203 while (1) {
2204 if (size <= total) {
2205 res = AVERROR_INVALIDDATA;
2206 break;
2207 }
2208 temp = *data;
2209 total += temp;
2210 lace_size[n] += temp;
2211 data += 1;
2212 size -= 1;
2213 if (temp != 0xff)
2214 break;
2215 }
2216 }
2217 if (size <= total) {
2218 res = AVERROR_INVALIDDATA;
2219 break;
2220 }
2221
2222 lace_size[n] = size - total;
2223 break;
2224 }
2225
2226 case 0x2: /* fixed-size lacing */
2227 if (size % (*laces)) {
2228 res = AVERROR_INVALIDDATA;
2229 break;
2230 }
2231 for (n = 0; n < *laces; n++)
2232 lace_size[n] = size / *laces;
2233 break;
2234
2235 case 0x3: /* EBML lacing */
2236 {
2237 uint64_t num;
2238 uint64_t total;
2239 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2240 if (n < 0 || num > INT_MAX) {
2241 av_log(matroska->ctx, AV_LOG_INFO,
2242 "EBML block data error\n");
2243 res = n<0 ? n : AVERROR_INVALIDDATA;
2244 break;
2245 }
2246 data += n;
2247 size -= n;
2248 total = lace_size[0] = num;
2249 for (n = 1; res == 0 && n < *laces - 1; n++) {
2250 int64_t snum;
2251 int r;
2252 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2253 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2254 av_log(matroska->ctx, AV_LOG_INFO,
2255 "EBML block data error\n");
2256 res = r<0 ? r : AVERROR_INVALIDDATA;
2257 break;
2258 }
2259 data += r;
2260 size -= r;
2261 lace_size[n] = lace_size[n - 1] + snum;
2262 total += lace_size[n];
2263 }
2264 if (size <= total) {
2265 res = AVERROR_INVALIDDATA;
2266 break;
2267 }
2268 lace_size[*laces - 1] = size - total;
2269 break;
2270 }
2271 }
2272
2273 *buf = data;
2274 *lace_buf = lace_size;
2275 *buf_size = size;
2276
2277 return res;
2278}
2279
2280static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2281 MatroskaTrack *track, AVStream *st,
2282 uint8_t *data, int size, uint64_t timecode,
2283 int64_t pos)
2284{
2285 int a = st->codec->block_align;
2286 int sps = track->audio.sub_packet_size;
2287 int cfs = track->audio.coded_framesize;
2288 int h = track->audio.sub_packet_h;
2289 int y = track->audio.sub_packet_cnt;
2290 int w = track->audio.frame_size;
2291 int x;
2292
2293 if (!track->audio.pkt_cnt) {
2294 if (track->audio.sub_packet_cnt == 0)
2295 track->audio.buf_timecode = timecode;
2296 if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2297 if (size < cfs * h / 2) {
2298 av_log(matroska->ctx, AV_LOG_ERROR,
2299 "Corrupt int4 RM-style audio packet size\n");
2300 return AVERROR_INVALIDDATA;
2301 }
2302 for (x = 0; x < h / 2; x++)
2303 memcpy(track->audio.buf + x * 2 * w + y * cfs,
2304 data + x * cfs, cfs);
2305 } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2306 if (size < w) {
2307 av_log(matroska->ctx, AV_LOG_ERROR,
2308 "Corrupt sipr RM-style audio packet size\n");
2309 return AVERROR_INVALIDDATA;
2310 }
2311 memcpy(track->audio.buf + y * w, data, w);
2312 } else {
2313 if (size < sps * w / sps || h<=0 || w%sps) {
2314 av_log(matroska->ctx, AV_LOG_ERROR,
2315 "Corrupt generic RM-style audio packet size\n");
2316 return AVERROR_INVALIDDATA;
2317 }
2318 for (x = 0; x < w / sps; x++)
2319 memcpy(track->audio.buf +
2320 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2321 data + x * sps, sps);
2322 }
2323
2324 if (++track->audio.sub_packet_cnt >= h) {
2325 if (st->codec->codec_id == AV_CODEC_ID_SIPR)
2326 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2327 track->audio.sub_packet_cnt = 0;
2328 track->audio.pkt_cnt = h * w / a;
2329 }
2330 }
2331
2332 while (track->audio.pkt_cnt) {
f6fa7814
DM		 2333 int ret;
2334 AVPacket *pkt = av_mallocz(sizeof(AVPacket));
2335 if (!pkt)
2ba45a60 2336 return AVERROR(ENOMEM);
f6fa7814
DM		 2337
2338 ret = av_new_packet(pkt, a);
2339 if (ret < 0) {
2340 av_free(pkt);
2341 return ret;
2ba45a60
DM		 2342 }
2343 memcpy(pkt->data,
2344 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2345 a);
2346 pkt->pts = track->audio.buf_timecode;
2347 track->audio.buf_timecode = AV_NOPTS_VALUE;
2348 pkt->pos = pos;
2349 pkt->stream_index = st->index;
2350 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2351 }
2352
2353 return 0;
2354}
2355
2356/* reconstruct full wavpack blocks from mangled matroska ones */
2357static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
2358 uint8_t **pdst, int *size)
2359{
2360 uint8_t *dst = NULL;
2361 int dstlen = 0;
2362 int srclen = *size;
2363 uint32_t samples;
2364 uint16_t ver;
2365 int ret, offset = 0;
2366
2367 if (srclen < 12 || track->stream->codec->extradata_size < 2)
2368 return AVERROR_INVALIDDATA;
2369
2370 ver = AV_RL16(track->stream->codec->extradata);
2371
2372 samples = AV_RL32(src);
2373 src += 4;
2374 srclen -= 4;
2375
2376 while (srclen >= 8) {
2377 int multiblock;
2378 uint32_t blocksize;
2379 uint8_t *tmp;
2380
2381 uint32_t flags = AV_RL32(src);
2382 uint32_t crc = AV_RL32(src + 4);
2383 src += 8;
2384 srclen -= 8;
2385
2386 multiblock = (flags & 0x1800) != 0x1800;
2387 if (multiblock) {
2388 if (srclen < 4) {
2389 ret = AVERROR_INVALIDDATA;
2390 goto fail;
2391 }
2392 blocksize = AV_RL32(src);
2393 src += 4;
2394 srclen -= 4;
2395 } else
2396 blocksize = srclen;
2397
2398 if (blocksize > srclen) {
2399 ret = AVERROR_INVALIDDATA;
2400 goto fail;
2401 }
2402
2403 tmp = av_realloc(dst, dstlen + blocksize + 32);
2404 if (!tmp) {
2405 ret = AVERROR(ENOMEM);
2406 goto fail;
2407 }
2408 dst = tmp;
2409 dstlen += blocksize + 32;
2410
2411 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2412 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2413 AV_WL16(dst + offset + 8, ver); // version
2414 AV_WL16(dst + offset + 10, 0); // track/index_no
2415 AV_WL32(dst + offset + 12, 0); // total samples
2416 AV_WL32(dst + offset + 16, 0); // block index
2417 AV_WL32(dst + offset + 20, samples); // number of samples
2418 AV_WL32(dst + offset + 24, flags); // flags
2419 AV_WL32(dst + offset + 28, crc); // crc
2420 memcpy(dst + offset + 32, src, blocksize); // block data
2421
2422 src += blocksize;
2423 srclen -= blocksize;
2424 offset += blocksize + 32;
2425 }
2426
2427 *pdst = dst;
2428 *size = dstlen;
2429
2430 return 0;
2431
2432fail:
2433 av_freep(&dst);
2434 return ret;
2435}
2436
2437static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
2438 MatroskaTrack *track,
2439 AVStream *st,
2440 uint8_t *data, int data_len,
2441 uint64_t timecode,
2442 uint64_t duration,
2443 int64_t pos)
2444{
2445 AVPacket *pkt;
2446 uint8_t *id, *settings, *text, *buf;
2447 int id_len, settings_len, text_len;
2448 uint8_t *p, *q;
2449 int err;
2450
2451 if (data_len <= 0)
2452 return AVERROR_INVALIDDATA;
2453
2454 p = data;
2455 q = data + data_len;
2456
2457 id = p;
2458 id_len = -1;
2459 while (p < q) {
2460 if (*p == '\r' || *p == '\n') {
2461 id_len = p - id;
2462 if (*p == '\r')
2463 p++;
2464 break;
2465 }
2466 p++;
2467 }
2468
2469 if (p >= q || *p != '\n')
2470 return AVERROR_INVALIDDATA;
2471 p++;
2472
2473 settings = p;
2474 settings_len = -1;
2475 while (p < q) {
2476 if (*p == '\r' || *p == '\n') {
2477 settings_len = p - settings;
2478 if (*p == '\r')
2479 p++;
2480 break;
2481 }
2482 p++;
2483 }
2484
2485 if (p >= q || *p != '\n')
2486 return AVERROR_INVALIDDATA;
2487 p++;
2488
2489 text = p;
2490 text_len = q - p;
2491 while (text_len > 0) {
2492 const int len = text_len - 1;
2493 const uint8_t c = p[len];
2494 if (c != '\r' && c != '\n')
2495 break;
2496 text_len = len;
2497 }
2498
2499 if (text_len <= 0)
2500 return AVERROR_INVALIDDATA;
2501
2502 pkt = av_mallocz(sizeof(*pkt));
2503 err = av_new_packet(pkt, text_len);
2504 if (err < 0) {
2505 av_free(pkt);
2506 return AVERROR(err);
2507 }
2508
2509 memcpy(pkt->data, text, text_len);
2510
2511 if (id_len > 0) {
2512 buf = av_packet_new_side_data(pkt,
2513 AV_PKT_DATA_WEBVTT_IDENTIFIER,
2514 id_len);
2515 if (!buf) {
2516 av_free(pkt);
2517 return AVERROR(ENOMEM);
2518 }
2519 memcpy(buf, id, id_len);
2520 }
2521
2522 if (settings_len > 0) {
2523 buf = av_packet_new_side_data(pkt,
2524 AV_PKT_DATA_WEBVTT_SETTINGS,
2525 settings_len);
2526 if (!buf) {
2527 av_free(pkt);
2528 return AVERROR(ENOMEM);
2529 }
2530 memcpy(buf, settings, settings_len);
2531 }
2532
2533 // Do we need this for subtitles?
2534 // pkt->flags = AV_PKT_FLAG_KEY;
2535
2536 pkt->stream_index = st->index;
2537 pkt->pts = timecode;
2538
2539 // Do we need this for subtitles?
2540 // pkt->dts = timecode;
2541
2542 pkt->duration = duration;
2543 pkt->pos = pos;
2544
2545 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2546 matroska->prev_pkt = pkt;
2547
2548 return 0;
2549}
2550
2551static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2552 MatroskaTrack *track, AVStream *st,
2553 uint8_t *data, int pkt_size,
2554 uint64_t timecode, uint64_t lace_duration,
2555 int64_t pos, int is_keyframe,
2556 uint8_t *additional, uint64_t additional_id, int additional_size,
2557 int64_t discard_padding)
2558{
2559 MatroskaTrackEncoding *encodings = track->encodings.elem;
2560 uint8_t *pkt_data = data;
2561 int offset = 0, res;
2562 AVPacket *pkt;
2563
2564 if (encodings && !encodings->type && encodings->scope & 1) {
2565 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2566 if (res < 0)
2567 return res;
2568 }
2569
2570 if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2571 uint8_t *wv_data;
2572 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2573 if (res < 0) {
2574 av_log(matroska->ctx, AV_LOG_ERROR,
2575 "Error parsing a wavpack block.\n");
2576 goto fail;
2577 }
2578 if (pkt_data != data)
2579 av_freep(&pkt_data);
2580 pkt_data = wv_data;
2581 }
2582
2583 if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2584 AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2585 offset = 8;
2586
2587 pkt = av_mallocz(sizeof(AVPacket));
2588 /* XXX: prevent data copy... */
2589 if (av_new_packet(pkt, pkt_size + offset) < 0) {
2590 av_free(pkt);
2591 res = AVERROR(ENOMEM);
2592 goto fail;
2593 }
2594
2595 if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2596 uint8_t *buf = pkt->data;
2597 bytestream_put_be32(&buf, pkt_size);
2598 bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2599 }
2600
2601 memcpy(pkt->data + offset, pkt_data, pkt_size);
2602
2603 if (pkt_data != data)
2604 av_freep(&pkt_data);
2605
2606 pkt->flags = is_keyframe;
2607 pkt->stream_index = st->index;
2608
2609 if (additional_size > 0) {
2610 uint8_t *side_data = av_packet_new_side_data(pkt,
2611 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2612 additional_size + 8);
2613 if (!side_data) {
2614 av_free_packet(pkt);
2615 av_free(pkt);
2616 return AVERROR(ENOMEM);
2617 }
2618 AV_WB64(side_data, additional_id);
2619 memcpy(side_data + 8, additional, additional_size);
2620 }
2621
2622 if (discard_padding) {
2623 uint8_t *side_data = av_packet_new_side_data(pkt,
2624 AV_PKT_DATA_SKIP_SAMPLES,
2625 10);
2626 if (!side_data) {
2627 av_free_packet(pkt);
2628 av_free(pkt);
2629 return AVERROR(ENOMEM);
2630 }
2631 AV_WL32(side_data, 0);
2632 AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2633 (AVRational){1, 1000000000},
2634 (AVRational){1, st->codec->sample_rate}));
2635 }
2636
2637 if (track->ms_compat)
2638 pkt->dts = timecode;
2639 else
2640 pkt->pts = timecode;
2641 pkt->pos = pos;
2642 if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2643 /*
2644 * For backward compatibility.
2645 * Historically, we have put subtitle duration
2646 * in convergence_duration, on the off chance
2647 * that the time_scale is less than 1us, which
2648 * could result in a 32bit overflow on the
2649 * normal duration field.
2650 */
2651 pkt->convergence_duration = lace_duration;
2652 }
2653
2654 if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2655 lace_duration <= INT_MAX) {
2656 /*
2657 * For non subtitle tracks, just store the duration
2658 * as normal.
2659 *
2660 * If it's a subtitle track and duration value does
2661 * not overflow a uint32, then also store it normally.
2662 */
2663 pkt->duration = lace_duration;
2664 }
2665
2666 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2667 matroska->prev_pkt = pkt;
2668
2669 return 0;
2670
2671fail:
2672 if (pkt_data != data)
2673 av_freep(&pkt_data);
2674 return res;
2675}
2676
2677static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2678 int size, int64_t pos, uint64_t cluster_time,
2679 uint64_t block_duration, int is_keyframe,
2680 uint8_t *additional, uint64_t additional_id, int additional_size,
2681 int64_t cluster_pos, int64_t discard_padding)
2682{
2683 uint64_t timecode = AV_NOPTS_VALUE;
2684 MatroskaTrack *track;
2685 int res = 0;
2686 AVStream *st;
2687 int16_t block_time;
2688 uint32_t *lace_size = NULL;
2689 int n, flags, laces = 0;
2690 uint64_t num;
2691 int trust_default_duration = 1;
2692
2693 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2694 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2695 return n;
2696 }
2697 data += n;
2698 size -= n;
2699
2700 track = matroska_find_track_by_num(matroska, num);
2701 if (!track || !track->stream) {
2702 av_log(matroska->ctx, AV_LOG_INFO,
2703 "Invalid stream %"PRIu64" or size %u\n", num, size);
2704 return AVERROR_INVALIDDATA;
2705 } else if (size <= 3)
2706 return 0;
2707 st = track->stream;
2708 if (st->discard >= AVDISCARD_ALL)
2709 return res;
2710 av_assert1(block_duration != AV_NOPTS_VALUE);
2711
2712 block_time = sign_extend(AV_RB16(data), 16);
2713 data += 2;
2714 flags = *data++;
2715 size -= 3;
2716 if (is_keyframe == -1)
2717 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2718
2719 if (cluster_time != (uint64_t) -1 &&
2720 (block_time >= 0 || cluster_time >= -block_time)) {
2721 timecode = cluster_time + block_time - track->codec_delay;
2722 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2723 timecode < track->end_timecode)
2724 is_keyframe = 0; /* overlapping subtitles are not key frame */
2725 if (is_keyframe)
2726 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2727 AVINDEX_KEYFRAME);
2728 }
2729
2730 if (matroska->skip_to_keyframe &&
2731 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2732 if (timecode < matroska->skip_to_timecode)
2733 return res;
2734 if (is_keyframe)
2735 matroska->skip_to_keyframe = 0;
2736 else if (!st->skip_to_keyframe) {
2737 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2738 matroska->skip_to_keyframe = 0;
2739 }
2740 }
2741
2742 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2743 &lace_size, &laces);
2744
2745 if (res)
2746 goto end;
2747
2748 if (track->audio.samplerate == 8000) {
2749 // If this is needed for more codecs, then add them here
2750 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2751 if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2752 trust_default_duration = 0;
2753 }
2754 }
2755
2756 if (!block_duration && trust_default_duration)
2757 block_duration = track->default_duration * laces / matroska->time_scale;
2758
2759 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2760 track->end_timecode =
2761 FFMAX(track->end_timecode, timecode + block_duration);
2762
2763 for (n = 0; n < laces; n++) {
2764 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2765
2766 if (lace_size[n] > size) {
2767 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2768 break;
2769 }
2770
2771 if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2772 st->codec->codec_id == AV_CODEC_ID_COOK ||
2773 st->codec->codec_id == AV_CODEC_ID_SIPR ||
2774 st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2775 st->codec->block_align && track->audio.sub_packet_size) {
2776 res = matroska_parse_rm_audio(matroska, track, st, data,
2777 lace_size[n],
2778 timecode, pos);
2779 if (res)
2780 goto end;
2781
2782 } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2783 res = matroska_parse_webvtt(matroska, track, st,
2784 data, lace_size[n],
2785 timecode, lace_duration,
2786 pos);
2787 if (res)
2788 goto end;
2789 } else {
2790 res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2791 timecode, lace_duration, pos,
2792 !n ? is_keyframe : 0,
2793 additional, additional_id, additional_size,
2794 discard_padding);
2795 if (res)
2796 goto end;
2797 }
2798
2799 if (timecode != AV_NOPTS_VALUE)
2800 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2801 data += lace_size[n];
2802 size -= lace_size[n];
2803 }
2804
2805end:
2806 av_free(lace_size);
2807 return res;
2808}
2809
2810static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2811{
2812 EbmlList *blocks_list;
2813 MatroskaBlock *blocks;
2814 int i, res;
2815 res = ebml_parse(matroska,
2816 matroska_cluster_incremental_parsing,
2817 &matroska->current_cluster);
2818 if (res == 1) {
2819 /* New Cluster */
2820 if (matroska->current_cluster_pos)
2821 ebml_level_end(matroska);
2822 ebml_free(matroska_cluster, &matroska->current_cluster);
2823 memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2824 matroska->current_cluster_num_blocks = 0;
2825 matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2826 matroska->prev_pkt = NULL;
2827 /* sizeof the ID which was already read */
2828 if (matroska->current_id)
2829 matroska->current_cluster_pos -= 4;
2830 res = ebml_parse(matroska,
2831 matroska_clusters_incremental,
2832 &matroska->current_cluster);
2833 /* Try parsing the block again. */
2834 if (res == 1)
2835 res = ebml_parse(matroska,
2836 matroska_cluster_incremental_parsing,
2837 &matroska->current_cluster);
2838 }
2839
2840 if (!res &&
2841 matroska->current_cluster_num_blocks <
2842 matroska->current_cluster.blocks.nb_elem) {
2843 blocks_list = &matroska->current_cluster.blocks;
2844 blocks = blocks_list->elem;
2845
2846 matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2847 i = blocks_list->nb_elem - 1;
2848 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2849 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2850 uint8_t* additional = blocks[i].additional.size > 0 ?
2851 blocks[i].additional.data : NULL;
2852 if (!blocks[i].non_simple)
2853 blocks[i].duration = 0;
2854 res = matroska_parse_block(matroska, blocks[i].bin.data,
2855 blocks[i].bin.size, blocks[i].bin.pos,
2856 matroska->current_cluster.timecode,
2857 blocks[i].duration, is_keyframe,
2858 additional, blocks[i].additional_id,
2859 blocks[i].additional.size,
2860 matroska->current_cluster_pos,
2861 blocks[i].discard_padding);
2862 }
2863 }
2864
2865 return res;
2866}
2867
2868static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2869{
2870 MatroskaCluster cluster = { 0 };
2871 EbmlList *blocks_list;
2872 MatroskaBlock *blocks;
2873 int i, res;
2874 int64_t pos;
2875
2876 if (!matroska->contains_ssa)
2877 return matroska_parse_cluster_incremental(matroska);
2878 pos = avio_tell(matroska->ctx->pb);
2879 matroska->prev_pkt = NULL;
2880 if (matroska->current_id)
2881 pos -= 4; /* sizeof the ID which was already read */
2882 res = ebml_parse(matroska, matroska_clusters, &cluster);
2883 blocks_list = &cluster.blocks;
2884 blocks = blocks_list->elem;
2885 for (i = 0; i < blocks_list->nb_elem; i++)
2886 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2887 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2888 res = matroska_parse_block(matroska, blocks[i].bin.data,
2889 blocks[i].bin.size, blocks[i].bin.pos,
2890 cluster.timecode, blocks[i].duration,
2891 is_keyframe, NULL, 0, 0, pos,
2892 blocks[i].discard_padding);
2893 }
2894 ebml_free(matroska_cluster, &cluster);
2895 return res;
2896}
2897
2898static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2899{
2900 MatroskaDemuxContext *matroska = s->priv_data;
2901
2902 while (matroska_deliver_packet(matroska, pkt)) {
2903 int64_t pos = avio_tell(matroska->ctx->pb);
2904 if (matroska->done)
2905 return AVERROR_EOF;
2906 if (matroska_parse_cluster(matroska) < 0)
2907 matroska_resync(matroska, pos);
2908 }
2909
2910 return 0;
2911}
2912
2913static int matroska_read_seek(AVFormatContext *s, int stream_index,
2914 int64_t timestamp, int flags)
2915{
2916 MatroskaDemuxContext *matroska = s->priv_data;
f6fa7814 2917 MatroskaTrack *tracks = NULL;
2ba45a60
DM		 2918 AVStream *st = s->streams[stream_index];
2919 int i, index, index_sub, index_min;
2920
2921 /* Parse the CUES now since we need the index data to seek. */
2922 if (matroska->cues_parsing_deferred > 0) {
2923 matroska->cues_parsing_deferred = 0;
2924 matroska_parse_cues(matroska);
2925 }
2926
2927 if (!st->nb_index_entries)
2928 goto err;
2929 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
2930
f6fa7814 2931 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
2ba45a60
DM		 2932 avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
2933 SEEK_SET);
2934 matroska->current_id = 0;
f6fa7814 2935 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
2ba45a60
DM		 2936 matroska_clear_queue(matroska);
2937 if (matroska_parse_cluster(matroska) < 0)
2938 break;
2939 }
2940 }
2941
2942 matroska_clear_queue(matroska);
2943 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
2944 goto err;
2945
2946 index_min = index;
f6fa7814 2947 tracks = matroska->tracks.elem;
2ba45a60
DM		 2948 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2949 tracks[i].audio.pkt_cnt = 0;
2950 tracks[i].audio.sub_packet_cnt = 0;
2951 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2952 tracks[i].end_timecode = 0;
2953 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2954 tracks[i].stream->discard != AVDISCARD_ALL) {
2955 index_sub = av_index_search_timestamp(
2956 tracks[i].stream, st->index_entries[index].timestamp,
2957 AVSEEK_FLAG_BACKWARD);
2958 while (index_sub >= 0 &&
2959 index_min > 0 &&
2960 tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
2961 st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
2962 index_min--;
2963 }
2964 }
2965
2966 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2967 matroska->current_id = 0;
2968 if (flags & AVSEEK_FLAG_ANY) {
2969 st->skip_to_keyframe = 0;
2970 matroska->skip_to_timecode = timestamp;
2971 } else {
2972 st->skip_to_keyframe = 1;
2973 matroska->skip_to_timecode = st->index_entries[index].timestamp;
2974 }
2975 matroska->skip_to_keyframe = 1;
2976 matroska->done = 0;
2977 matroska->num_levels = 0;
2978 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2979 return 0;
2980err:
2981 // slightly hackish but allows proper fallback to
2982 // the generic seeking code.
2983 matroska_clear_queue(matroska);
2984 matroska->current_id = 0;
2985 st->skip_to_keyframe =
2986 matroska->skip_to_keyframe = 0;
2987 matroska->done = 0;
2988 matroska->num_levels = 0;
2989 return -1;
2990}
2991
2992static int matroska_read_close(AVFormatContext *s)
2993{
2994 MatroskaDemuxContext *matroska = s->priv_data;
2995 MatroskaTrack *tracks = matroska->tracks.elem;
2996 int n;
2997
2998 matroska_clear_queue(matroska);
2999
3000 for (n = 0; n < matroska->tracks.nb_elem; n++)
3001 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3002 av_free(tracks[n].audio.buf);
3003 ebml_free(matroska_cluster, &matroska->current_cluster);
3004 ebml_free(matroska_segment, matroska);
3005
3006 return 0;
3007}
3008
3009typedef struct {
3010 int64_t start_time_ns;
3011 int64_t end_time_ns;
3012 int64_t start_offset;
3013 int64_t end_offset;
3014} CueDesc;
3015
3016/* This function searches all the Cues and returns the CueDesc corresponding the
3017 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3018 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3019 */
3020static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3021 MatroskaDemuxContext *matroska = s->priv_data;
3022 CueDesc cue_desc;
3023 int i;
3024 int nb_index_entries = s->streams[0]->nb_index_entries;
3025 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3026 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3027 for (i = 1; i < nb_index_entries; i++) {
3028 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3029 index_entries[i].timestamp * matroska->time_scale > ts) {
3030 break;
3031 }
3032 }
3033 --i;
3034 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3035 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3036 if (i != nb_index_entries - 1) {
3037 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3038 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3039 } else {
3040 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3041 // FIXME: this needs special handling for files where Cues appear
3042 // before Clusters. the current logic assumes Cues appear after
3043 // Clusters.
3044 cue_desc.end_offset = cues_start - matroska->segment_start;
3045 }
3046 return cue_desc;
3047}
3048
3049static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3050{
3051 MatroskaDemuxContext *matroska = s->priv_data;
3052 int64_t cluster_pos, before_pos;
3053 int index, rv = 1;
3054 if (s->streams[0]->nb_index_entries <= 0) return 0;
3055 // seek to the first cluster using cues.
3056 index = av_index_search_timestamp(s->streams[0], 0, 0);
3057 if (index < 0) return 0;
3058 cluster_pos = s->streams[0]->index_entries[index].pos;
3059 before_pos = avio_tell(s->pb);
3060 while (1) {
3061 int64_t cluster_id = 0, cluster_length = 0;
3062 AVPacket *pkt;
3063 avio_seek(s->pb, cluster_pos, SEEK_SET);
3064 // read cluster id and length
3065 ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
3066 ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3067 if (cluster_id != 0xF43B675) { // done with all clusters
3068 break;
3069 }
3070 avio_seek(s->pb, cluster_pos, SEEK_SET);
3071 matroska->current_id = 0;
3072 matroska_clear_queue(matroska);
3073 if (matroska_parse_cluster(matroska) < 0 ||
3074 matroska->num_packets <= 0) {
3075 break;
3076 }
3077 pkt = matroska->packets[0];
3078 cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
3079 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3080 rv = 0;
3081 break;
3082 }
3083 }
3084 avio_seek(s->pb, before_pos, SEEK_SET);
3085 return rv;
3086}
3087
3088static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3089 double min_buffer, double* buffer,
3090 double* sec_to_download, AVFormatContext *s,
3091 int64_t cues_start)
3092{
3093 double nano_seconds_per_second = 1000000000.0;
3094 double time_sec = time_ns / nano_seconds_per_second;
3095 int rv = 0;
3096 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3097 int64_t end_time_ns = time_ns + time_to_search_ns;
3098 double sec_downloaded = 0.0;
3099 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3100 if (desc_curr.start_time_ns == -1)
3101 return -1;
3102 *sec_to_download = 0.0;
3103
3104 // Check for non cue start time.
3105 if (time_ns > desc_curr.start_time_ns) {
3106 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3107 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3108 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3109 double timeToDownload = (cueBytes * 8.0) / bps;
3110
3111 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3112 *sec_to_download += timeToDownload;
3113
3114 // Check if the search ends within the first cue.
3115 if (desc_curr.end_time_ns >= end_time_ns) {
3116 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3117 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3118 sec_downloaded = percent_to_sub * sec_downloaded;
3119 *sec_to_download = percent_to_sub * *sec_to_download;
3120 }
3121
3122 if ((sec_downloaded + *buffer) <= min_buffer) {
3123 return 1;
3124 }
3125
3126 // Get the next Cue.
3127 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3128 }
3129
3130 while (desc_curr.start_time_ns != -1) {
3131 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3132 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3133 double desc_sec = desc_ns / nano_seconds_per_second;
3134 double bits = (desc_bytes * 8.0);
3135 double time_to_download = bits / bps;
3136
3137 sec_downloaded += desc_sec - time_to_download;
3138 *sec_to_download += time_to_download;
3139
3140 if (desc_curr.end_time_ns >= end_time_ns) {
3141 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3142 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3143 sec_downloaded = percent_to_sub * sec_downloaded;
3144 *sec_to_download = percent_to_sub * *sec_to_download;
3145
3146 if ((sec_downloaded + *buffer) <= min_buffer)
3147 rv = 1;
3148 break;
3149 }
3150
3151 if ((sec_downloaded + *buffer) <= min_buffer) {
3152 rv = 1;
3153 break;
3154 }
3155
3156 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3157 }
3158 *buffer = *buffer + sec_downloaded;
3159 return rv;
3160}
3161
3162/* This function computes the bandwidth of the WebM file with the help of
3163 * buffer_size_after_time_downloaded() function. Both of these functions are
3164 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3165 * Matroska parsing mechanism.
3166 *
3167 * Returns the bandwidth of the file on success; -1 on error.
3168 * */
3169static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3170{
3171 MatroskaDemuxContext *matroska = s->priv_data;
3172 AVStream *st = s->streams[0];
3173 double bandwidth = 0.0;
3174 int i;
3175
3176 for (i = 0; i < st->nb_index_entries; i++) {
3177 int64_t prebuffer_ns = 1000000000;
3178 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3179 double nano_seconds_per_second = 1000000000.0;
3180 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3181 double prebuffer_bytes = 0.0;
3182 int64_t temp_prebuffer_ns = prebuffer_ns;
3183 int64_t pre_bytes, pre_ns;
3184 double pre_sec, prebuffer, bits_per_second;
3185 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3186
3187 // Start with the first Cue.
3188 CueDesc desc_end = desc_beg;
3189
3190 // Figure out how much data we have downloaded for the prebuffer. This will
3191 // be used later to adjust the bits per sample to try.
3192 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3193 // Prebuffered the entire Cue.
3194 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3195 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3196 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3197 }
3198 if (desc_end.start_time_ns == -1) {
3199 // The prebuffer is larger than the duration.
f6fa7814
DM		 3200 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3201 return -1;
3202 bits_per_second = 0.0;
3203 } else {
3204 // The prebuffer ends in the last Cue. Estimate how much data was
3205 // prebuffered.
3206 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3207 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3208 pre_sec = pre_ns / nano_seconds_per_second;
3209 prebuffer_bytes +=
3210 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3211
3212 prebuffer = prebuffer_ns / nano_seconds_per_second;
3213
3214 // Set this to 0.0 in case our prebuffer buffers the entire video.
3215 bits_per_second = 0.0;
3216 do {
3217 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3218 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3219 double desc_sec = desc_ns / nano_seconds_per_second;
3220 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3221
3222 // Drop the bps by the percentage of bytes buffered.
3223 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3224 double mod_bits_per_second = calc_bits_per_second * percent;
3225
3226 if (prebuffer < desc_sec) {
3227 double search_sec =
3228 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3229
3230 // Add 1 so the bits per second should be a little bit greater than file
3231 // datarate.
3232 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3233 const double min_buffer = 0.0;
3234 double buffer = prebuffer;
3235 double sec_to_download = 0.0;
3236
3237 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3238 min_buffer, &buffer, &sec_to_download,
3239 s, cues_start);
3240 if (rv < 0) {
3241 return -1;
3242 } else if (rv == 0) {
3243 bits_per_second = (double)(bps);
3244 break;
3245 }
2ba45a60 3246 }
2ba45a60 3247
f6fa7814
DM		 3248 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3249 } while (desc_end.start_time_ns != -1);
3250 }
2ba45a60
DM		 3251 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3252 }
3253 return (int64_t)bandwidth;
3254}
3255
3256static int webm_dash_manifest_cues(AVFormatContext *s)
3257{
3258 MatroskaDemuxContext *matroska = s->priv_data;
3259 EbmlList *seekhead_list = &matroska->seekhead;
3260 MatroskaSeekhead *seekhead = seekhead_list->elem;
3261 char *buf;
3262 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3263 int i;
3264
3265 // determine cues start and end positions
3266 for (i = 0; i < seekhead_list->nb_elem; i++)
3267 if (seekhead[i].id == MATROSKA_ID_CUES)
3268 break;
3269
3270 if (i >= seekhead_list->nb_elem) return -1;
3271
3272 before_pos = avio_tell(matroska->ctx->pb);
3273 cues_start = seekhead[i].pos + matroska->segment_start;
3274 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
f6fa7814
DM		 3275 // cues_end is computed as cues_start + cues_length + length of the
3276 // Cues element ID + EBML length of the Cues element. cues_end is
3277 // inclusive and the above sum is reduced by 1.
3278 uint64_t cues_length = 0, cues_id = 0, bytes_read = 0;
3279 bytes_read += ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
3280 bytes_read += ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
3281 cues_end = cues_start + cues_length + bytes_read - 1;
2ba45a60
DM		 3282 }
3283 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3284 if (cues_start == -1 || cues_end == -1) return -1;
3285
3286 // parse the cues
3287 matroska_parse_cues(matroska);
3288
3289 // cues start
3290 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
3291
3292 // cues end
3293 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
3294
3295 // bandwidth
3296 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
3297 if (bandwidth < 0) return -1;
3298 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
3299
3300 // check if all clusters start with key frames
3301 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
3302
3303 // store cue point timestamps as a comma separated list for checking subsegment alignment in
3304 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3305 buf = av_malloc(s->streams[0]->nb_index_entries * 20 * sizeof(char));
3306 if (!buf) return -1;
3307 strcpy(buf, "");
3308 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
3309 snprintf(buf, (i + 1) * 20 * sizeof(char),
3310 "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
3311 if (i != s->streams[0]->nb_index_entries - 1)
3312 strncat(buf, ",", sizeof(char));
3313 }
3314 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
3315 av_free(buf);
3316
3317 return 0;
3318}
3319
3320static int webm_dash_manifest_read_header(AVFormatContext *s)
3321{
3322 char *buf;
3323 int ret = matroska_read_header(s);
3324 MatroskaTrack *tracks;
3325 MatroskaDemuxContext *matroska = s->priv_data;
3326 if (ret) {
3327 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
3328 return -1;
3329 }
3330
3331 // initialization range
3332 // 5 is the offset of Cluster ID.
3333 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, avio_tell(s->pb) - 5, 0);
3334
3335 // basename of the file
3336 buf = strrchr(s->filename, '/');
f6fa7814 3337 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->filename, 0);
2ba45a60
DM		 3338
3339 // duration
3340 buf = av_asprintf("%g", matroska->duration);
3341 if (!buf) return AVERROR(ENOMEM);
3342 av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
3343 av_free(buf);
3344
3345 // track number
3346 tracks = matroska->tracks.elem;
3347 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
3348
3349 // parse the cues and populate Cue related fields
3350 return webm_dash_manifest_cues(s);
3351}
3352
3353static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
3354{
3355 return AVERROR_EOF;
3356}
3357
3358AVInputFormat ff_matroska_demuxer = {
3359 .name = "matroska,webm",
3360 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3361 .extensions = "mkv,mk3d,mka,mks",
3362 .priv_data_size = sizeof(MatroskaDemuxContext),
3363 .read_probe = matroska_probe,
3364 .read_header = matroska_read_header,
3365 .read_packet = matroska_read_packet,
3366 .read_close = matroska_read_close,
3367 .read_seek = matroska_read_seek,
3368 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3369};
3370
3371AVInputFormat ff_webm_dash_manifest_demuxer = {
3372 .name = "webm_dash_manifest",
3373 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
3374 .priv_data_size = sizeof(MatroskaDemuxContext),
3375 .read_header = webm_dash_manifest_read_header,
3376 .read_packet = webm_dash_manifest_read_packet,
3377 .read_close = matroska_read_close,
3378};
ffmpeg Piment Noir Debian package repository