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Imported Debian version 2.4.3~trusty1
[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>
35#if CONFIG_BZLIB
36#include <bzlib.h>
37#endif
38#if CONFIG_ZLIB
39#include <zlib.h>
40#endif
41
42#include "libavutil/avstring.h"
43#include "libavutil/base64.h"
44#include "libavutil/dict.h"
45#include "libavutil/intfloat.h"
46#include "libavutil/intreadwrite.h"
47#include "libavutil/lzo.h"
48#include "libavutil/mathematics.h"
49
50#include "libavcodec/bytestream.h"
51#include "libavcodec/flac.h"
52#include "libavcodec/mpeg4audio.h"
53
54#include "avformat.h"
55#include "avio_internal.h"
56#include "internal.h"
57#include "isom.h"
58#include "matroska.h"
59#include "oggdec.h"
60/* For ff_codec_get_id(). */
61#include "riff.h"
62#include "rmsipr.h"
63
64typedef enum {
65 EBML_NONE,
66 EBML_UINT,
67 EBML_FLOAT,
68 EBML_STR,
69 EBML_UTF8,
70 EBML_BIN,
71 EBML_NEST,
72 EBML_PASS,
73 EBML_STOP,
74 EBML_SINT,
75 EBML_TYPE_COUNT
76} EbmlType;
77
78typedef const struct EbmlSyntax {
79 uint32_t id;
80 EbmlType type;
81 int list_elem_size;
82 int data_offset;
83 union {
84 uint64_t u;
85 double f;
86 const char *s;
87 const struct EbmlSyntax *n;
88 } def;
89} EbmlSyntax;
90
91typedef struct {
92 int nb_elem;
93 void *elem;
94} EbmlList;
95
96typedef struct {
97 int size;
98 uint8_t *data;
99 int64_t pos;
100} EbmlBin;
101
102typedef struct {
103 uint64_t version;
104 uint64_t max_size;
105 uint64_t id_length;
106 char *doctype;
107 uint64_t doctype_version;
108} Ebml;
109
110typedef struct {
111 uint64_t algo;
112 EbmlBin settings;
113} MatroskaTrackCompression;
114
115typedef struct {
116 uint64_t algo;
117 EbmlBin key_id;
118} MatroskaTrackEncryption;
119
120typedef struct {
121 uint64_t scope;
122 uint64_t type;
123 MatroskaTrackCompression compression;
124 MatroskaTrackEncryption encryption;
125} MatroskaTrackEncoding;
126
127typedef struct {
128 double frame_rate;
129 uint64_t display_width;
130 uint64_t display_height;
131 uint64_t pixel_width;
132 uint64_t pixel_height;
133 EbmlBin color_space;
134 uint64_t stereo_mode;
135 uint64_t alpha_mode;
136} MatroskaTrackVideo;
137
138typedef struct {
139 double samplerate;
140 double out_samplerate;
141 uint64_t bitdepth;
142 uint64_t channels;
143
144 /* real audio header (extracted from extradata) */
145 int coded_framesize;
146 int sub_packet_h;
147 int frame_size;
148 int sub_packet_size;
149 int sub_packet_cnt;
150 int pkt_cnt;
151 uint64_t buf_timecode;
152 uint8_t *buf;
153} MatroskaTrackAudio;
154
155typedef struct {
156 uint64_t uid;
157 uint64_t type;
158} MatroskaTrackPlane;
159
160typedef struct {
161 EbmlList combine_planes;
162} MatroskaTrackOperation;
163
164typedef struct {
165 uint64_t num;
166 uint64_t uid;
167 uint64_t type;
168 char *name;
169 char *codec_id;
170 EbmlBin codec_priv;
171 char *language;
172 double time_scale;
173 uint64_t default_duration;
174 uint64_t flag_default;
175 uint64_t flag_forced;
176 uint64_t seek_preroll;
177 MatroskaTrackVideo video;
178 MatroskaTrackAudio audio;
179 MatroskaTrackOperation operation;
180 EbmlList encodings;
181 uint64_t codec_delay;
182
183 AVStream *stream;
184 int64_t end_timecode;
185 int ms_compat;
186 uint64_t max_block_additional_id;
187} MatroskaTrack;
188
189typedef struct {
190 uint64_t uid;
191 char *filename;
192 char *mime;
193 EbmlBin bin;
194
195 AVStream *stream;
196} MatroskaAttachment;
197
198typedef struct {
199 uint64_t start;
200 uint64_t end;
201 uint64_t uid;
202 char *title;
203
204 AVChapter *chapter;
205} MatroskaChapter;
206
207typedef struct {
208 uint64_t track;
209 uint64_t pos;
210} MatroskaIndexPos;
211
212typedef struct {
213 uint64_t time;
214 EbmlList pos;
215} MatroskaIndex;
216
217typedef struct {
218 char *name;
219 char *string;
220 char *lang;
221 uint64_t def;
222 EbmlList sub;
223} MatroskaTag;
224
225typedef struct {
226 char *type;
227 uint64_t typevalue;
228 uint64_t trackuid;
229 uint64_t chapteruid;
230 uint64_t attachuid;
231} MatroskaTagTarget;
232
233typedef struct {
234 MatroskaTagTarget target;
235 EbmlList tag;
236} MatroskaTags;
237
238typedef struct {
239 uint64_t id;
240 uint64_t pos;
241} MatroskaSeekhead;
242
243typedef struct {
244 uint64_t start;
245 uint64_t length;
246} MatroskaLevel;
247
248typedef struct {
249 uint64_t timecode;
250 EbmlList blocks;
251} MatroskaCluster;
252
253typedef struct {
254 AVFormatContext *ctx;
255
256 /* EBML stuff */
257 int num_levels;
258 MatroskaLevel levels[EBML_MAX_DEPTH];
259 int level_up;
260 uint32_t current_id;
261
262 uint64_t time_scale;
263 double duration;
264 char *title;
265 char *muxingapp;
266 EbmlBin date_utc;
267 EbmlList tracks;
268 EbmlList attachments;
269 EbmlList chapters;
270 EbmlList index;
271 EbmlList tags;
272 EbmlList seekhead;
273
274 /* byte position of the segment inside the stream */
275 int64_t segment_start;
276
277 /* the packet queue */
278 AVPacket **packets;
279 int num_packets;
280 AVPacket *prev_pkt;
281
282 int done;
283
284 /* What to skip before effectively reading a packet. */
285 int skip_to_keyframe;
286 uint64_t skip_to_timecode;
287
288 /* File has a CUES element, but we defer parsing until it is needed. */
289 int cues_parsing_deferred;
290
291 int current_cluster_num_blocks;
292 int64_t current_cluster_pos;
293 MatroskaCluster current_cluster;
294
295 /* File has SSA subtitles which prevent incremental cluster parsing. */
296 int contains_ssa;
297} MatroskaDemuxContext;
298
299typedef struct {
300 uint64_t duration;
301 int64_t reference;
302 uint64_t non_simple;
303 EbmlBin bin;
304 uint64_t additional_id;
305 EbmlBin additional;
306 int64_t discard_padding;
307} MatroskaBlock;
308
309static EbmlSyntax ebml_header[] = {
310 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
311 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
312 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
313 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
314 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
315 { EBML_ID_EBMLVERSION, EBML_NONE },
316 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
317 { 0 }
318};
319
320static EbmlSyntax ebml_syntax[] = {
321 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
322 { 0 }
323};
324
325static EbmlSyntax matroska_info[] = {
326 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
327 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
328 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
329 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
330 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
331 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
332 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
333 { 0 }
334};
335
336static EbmlSyntax matroska_track_video[] = {
337 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
338 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
339 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
340 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
341 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
342 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
343 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
344 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
345 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
346 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
347 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
348 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
349 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
350 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
351 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
352 { 0 }
353};
354
355static EbmlSyntax matroska_track_audio[] = {
356 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
357 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
358 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
359 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
360 { 0 }
361};
362
363static EbmlSyntax matroska_track_encoding_compression[] = {
364 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
365 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
366 { 0 }
367};
368
369static EbmlSyntax matroska_track_encoding_encryption[] = {
370 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
371 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
372 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
373 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
374 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
375 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
376 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
377 { 0 }
378};
379static EbmlSyntax matroska_track_encoding[] = {
380 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
381 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
382 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
383 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
384 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
385 { 0 }
386};
387
388static EbmlSyntax matroska_track_encodings[] = {
389 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
390 { 0 }
391};
392
393static EbmlSyntax matroska_track_plane[] = {
394 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
395 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
396 { 0 }
397};
398
399static EbmlSyntax matroska_track_combine_planes[] = {
400 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
401 { 0 }
402};
403
404static EbmlSyntax matroska_track_operation[] = {
405 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
406 { 0 }
407};
408
409static EbmlSyntax matroska_track[] = {
410 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
411 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
412 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
413 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
414 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
415 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
416 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
417 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
418 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
419 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
420 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
421 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
422 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
423 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
424 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
425 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
426 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
427 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
428 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
429 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
430 { MATROSKA_ID_CODECNAME, EBML_NONE },
431 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
432 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
433 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
434 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
435 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
436 { 0 }
437};
438
439static EbmlSyntax matroska_tracks[] = {
440 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
441 { 0 }
442};
443
444static EbmlSyntax matroska_attachment[] = {
445 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
446 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
447 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
448 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
449 { MATROSKA_ID_FILEDESC, EBML_NONE },
450 { 0 }
451};
452
453static EbmlSyntax matroska_attachments[] = {
454 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
455 { 0 }
456};
457
458static EbmlSyntax matroska_chapter_display[] = {
459 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
460 { MATROSKA_ID_CHAPLANG, EBML_NONE },
461 { 0 }
462};
463
464static EbmlSyntax matroska_chapter_entry[] = {
465 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
466 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
467 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
468 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
469 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
470 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
471 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
472 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
473 { 0 }
474};
475
476static EbmlSyntax matroska_chapter[] = {
477 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
478 { MATROSKA_ID_EDITIONUID, EBML_NONE },
479 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
480 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
481 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
482 { 0 }
483};
484
485static EbmlSyntax matroska_chapters[] = {
486 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
487 { 0 }
488};
489
490static EbmlSyntax matroska_index_pos[] = {
491 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
492 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
493 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
494 { MATROSKA_ID_CUEDURATION, EBML_NONE },
495 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
496 { 0 }
497};
498
499static EbmlSyntax matroska_index_entry[] = {
500 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
501 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
502 { 0 }
503};
504
505static EbmlSyntax matroska_index[] = {
506 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
507 { 0 }
508};
509
510static EbmlSyntax matroska_simpletag[] = {
511 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
512 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
513 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
514 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
515 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
516 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
517 { 0 }
518};
519
520static EbmlSyntax matroska_tagtargets[] = {
521 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
522 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
523 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
524 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
525 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
526 { 0 }
527};
528
529static EbmlSyntax matroska_tag[] = {
530 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
531 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
532 { 0 }
533};
534
535static EbmlSyntax matroska_tags[] = {
536 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
537 { 0 }
538};
539
540static EbmlSyntax matroska_seekhead_entry[] = {
541 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
542 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
543 { 0 }
544};
545
546static EbmlSyntax matroska_seekhead[] = {
547 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
548 { 0 }
549};
550
551static EbmlSyntax matroska_segment[] = {
552 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } },
553 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } },
554 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } },
555 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } },
556 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } },
557 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } },
558 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } },
559 { MATROSKA_ID_CLUSTER, EBML_STOP },
560 { 0 }
561};
562
563static EbmlSyntax matroska_segments[] = {
564 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
565 { 0 }
566};
567
568static EbmlSyntax matroska_blockmore[] = {
569 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
570 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
571 { 0 }
572};
573
574static EbmlSyntax matroska_blockadditions[] = {
575 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
576 { 0 }
577};
578
579static EbmlSyntax matroska_blockgroup[] = {
580 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
581 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
582 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
583 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
584 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
585 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
586 { MATROSKA_ID_CODECSTATE, EBML_NONE },
587 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
588 { 0 }
589};
590
591static EbmlSyntax matroska_cluster[] = {
592 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
593 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
594 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
595 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
596 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
597 { 0 }
598};
599
600static EbmlSyntax matroska_clusters[] = {
601 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } },
602 { MATROSKA_ID_INFO, EBML_NONE },
603 { MATROSKA_ID_CUES, EBML_NONE },
604 { MATROSKA_ID_TAGS, EBML_NONE },
605 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
606 { 0 }
607};
608
609static EbmlSyntax matroska_cluster_incremental_parsing[] = {
610 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
611 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
612 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
613 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
614 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
615 { MATROSKA_ID_INFO, EBML_NONE },
616 { MATROSKA_ID_CUES, EBML_NONE },
617 { MATROSKA_ID_TAGS, EBML_NONE },
618 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
619 { MATROSKA_ID_CLUSTER, EBML_STOP },
620 { 0 }
621};
622
623static EbmlSyntax matroska_cluster_incremental[] = {
624 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
625 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
626 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
627 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
628 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
629 { 0 }
630};
631
632static EbmlSyntax matroska_clusters_incremental[] = {
633 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
634 { MATROSKA_ID_INFO, EBML_NONE },
635 { MATROSKA_ID_CUES, EBML_NONE },
636 { MATROSKA_ID_TAGS, EBML_NONE },
637 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
638 { 0 }
639};
640
641static const char *const matroska_doctypes[] = { "matroska", "webm" };
642
643static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
644{
645 AVIOContext *pb = matroska->ctx->pb;
646 uint32_t id;
647 matroska->current_id = 0;
648 matroska->num_levels = 0;
649
650 /* seek to next position to resync from */
651 if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
652 goto eof;
653
654 id = avio_rb32(pb);
655
656 // try to find a toplevel element
657 while (!avio_feof(pb)) {
658 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
659 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
660 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
661 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
662 matroska->current_id = id;
663 return 0;
664 }
665 id = (id << 8) | avio_r8(pb);
666 }
667
668eof:
669 matroska->done = 1;
670 return AVERROR_EOF;
671}
672
673/*
674 * Return: Whether we reached the end of a level in the hierarchy or not.
675 */
676static int ebml_level_end(MatroskaDemuxContext *matroska)
677{
678 AVIOContext *pb = matroska->ctx->pb;
679 int64_t pos = avio_tell(pb);
680
681 if (matroska->num_levels > 0) {
682 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
683 if (pos - level->start >= level->length || matroska->current_id) {
684 matroska->num_levels--;
685 return 1;
686 }
687 }
688 return 0;
689}
690
691/*
692 * Read: an "EBML number", which is defined as a variable-length
693 * array of bytes. The first byte indicates the length by giving a
694 * number of 0-bits followed by a one. The position of the first
695 * "one" bit inside the first byte indicates the length of this
696 * number.
697 * Returns: number of bytes read, < 0 on error
698 */
699static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
700 int max_size, uint64_t *number)
701{
702 int read = 1, n = 1;
703 uint64_t total = 0;
704
705 /* The first byte tells us the length in bytes - avio_r8() can normally
706 * return 0, but since that's not a valid first ebmlID byte, we can
707 * use it safely here to catch EOS. */
708 if (!(total = avio_r8(pb))) {
709 /* we might encounter EOS here */
710 if (!avio_feof(pb)) {
711 int64_t pos = avio_tell(pb);
712 av_log(matroska->ctx, AV_LOG_ERROR,
713 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
714 pos, pos);
715 return pb->error ? pb->error : AVERROR(EIO);
716 }
717 return AVERROR_EOF;
718 }
719
720 /* get the length of the EBML number */
721 read = 8 - ff_log2_tab[total];
722 if (read > max_size) {
723 int64_t pos = avio_tell(pb) - 1;
724 av_log(matroska->ctx, AV_LOG_ERROR,
725 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
726 (uint8_t) total, pos, pos);
727 return AVERROR_INVALIDDATA;
728 }
729
730 /* read out length */
731 total ^= 1 << ff_log2_tab[total];
732 while (n++ < read)
733 total = (total << 8) | avio_r8(pb);
734
735 *number = total;
736
737 return read;
738}
739
740/**
741 * Read a EBML length value.
742 * This needs special handling for the "unknown length" case which has multiple
743 * encodings.
744 */
745static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
746 uint64_t *number)
747{
748 int res = ebml_read_num(matroska, pb, 8, number);
749 if (res > 0 && *number + 1 == 1ULL << (7 * res))
750 *number = 0xffffffffffffffULL;
751 return res;
752}
753
754/*
755 * Read the next element as an unsigned int.
756 * 0 is success, < 0 is failure.
757 */
758static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
759{
760 int n = 0;
761
762 if (size > 8)
763 return AVERROR_INVALIDDATA;
764
765 /* big-endian ordering; build up number */
766 *num = 0;
767 while (n++ < size)
768 *num = (*num << 8) | avio_r8(pb);
769
770 return 0;
771}
772
773/*
774 * Read the next element as a signed int.
775 * 0 is success, < 0 is failure.
776 */
777static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
778{
779 int n = 1;
780
781 if (size > 8)
782 return AVERROR_INVALIDDATA;
783
784 if (size == 0) {
785 *num = 0;
786 } else {
787 *num = sign_extend(avio_r8(pb), 8);
788
789 /* big-endian ordering; build up number */
790 while (n++ < size)
791 *num = (*num << 8) | avio_r8(pb);
792 }
793
794 return 0;
795}
796
797/*
798 * Read the next element as a float.
799 * 0 is success, < 0 is failure.
800 */
801static int ebml_read_float(AVIOContext *pb, int size, double *num)
802{
803 if (size == 0)
804 *num = 0;
805 else if (size == 4)
806 *num = av_int2float(avio_rb32(pb));
807 else if (size == 8)
808 *num = av_int2double(avio_rb64(pb));
809 else
810 return AVERROR_INVALIDDATA;
811
812 return 0;
813}
814
815/*
816 * Read the next element as an ASCII string.
817 * 0 is success, < 0 is failure.
818 */
819static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
820{
821 char *res;
822
823 /* EBML strings are usually not 0-terminated, so we allocate one
824 * byte more, read the string and NULL-terminate it ourselves. */
825 if (!(res = av_malloc(size + 1)))
826 return AVERROR(ENOMEM);
827 if (avio_read(pb, (uint8_t *) res, size) != size) {
828 av_free(res);
829 return AVERROR(EIO);
830 }
831 (res)[size] = '\0';
832 av_free(*str);
833 *str = res;
834
835 return 0;
836}
837
838/*
839 * Read the next element as binary data.
840 * 0 is success, < 0 is failure.
841 */
842static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
843{
844 av_fast_padded_malloc(&bin->data, &bin->size, length);
845 if (!bin->data)
846 return AVERROR(ENOMEM);
847
848 bin->size = length;
849 bin->pos = avio_tell(pb);
850 if (avio_read(pb, bin->data, length) != length) {
851 av_freep(&bin->data);
852 bin->size = 0;
853 return AVERROR(EIO);
854 }
855
856 return 0;
857}
858
859/*
860 * Read the next element, but only the header. The contents
861 * are supposed to be sub-elements which can be read separately.
862 * 0 is success, < 0 is failure.
863 */
864static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
865{
866 AVIOContext *pb = matroska->ctx->pb;
867 MatroskaLevel *level;
868
869 if (matroska->num_levels >= EBML_MAX_DEPTH) {
870 av_log(matroska->ctx, AV_LOG_ERROR,
871 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
872 return AVERROR(ENOSYS);
873 }
874
875 level = &matroska->levels[matroska->num_levels++];
876 level->start = avio_tell(pb);
877 level->length = length;
878
879 return 0;
880}
881
882/*
883 * Read signed/unsigned "EBML" numbers.
884 * Return: number of bytes processed, < 0 on error
885 */
886static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
887 uint8_t *data, uint32_t size, uint64_t *num)
888{
889 AVIOContext pb;
890 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
891 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
892}
893
894/*
895 * Same as above, but signed.
896 */
897static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
898 uint8_t *data, uint32_t size, int64_t *num)
899{
900 uint64_t unum;
901 int res;
902
903 /* read as unsigned number first */
904 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
905 return res;
906
907 /* make signed (weird way) */
908 *num = unum - ((1LL << (7 * res - 1)) - 1);
909
910 return res;
911}
912
913static int ebml_parse_elem(MatroskaDemuxContext *matroska,
914 EbmlSyntax *syntax, void *data);
915
916static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
917 uint32_t id, void *data)
918{
919 int i;
920 for (i = 0; syntax[i].id; i++)
921 if (id == syntax[i].id)
922 break;
923 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
924 matroska->num_levels > 0 &&
925 matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
926 return 0; // we reached the end of an unknown size cluster
927 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
928 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%"PRIX32"\n", id);
929 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
930 return AVERROR_INVALIDDATA;
931 }
932 return ebml_parse_elem(matroska, &syntax[i], data);
933}
934
935static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
936 void *data)
937{
938 if (!matroska->current_id) {
939 uint64_t id;
940 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
941 if (res < 0)
942 return res;
943 matroska->current_id = id | 1 << 7 * res;
944 }
945 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
946}
947
948static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
949 void *data)
950{
951 int i, res = 0;
952
953 for (i = 0; syntax[i].id; i++)
954 switch (syntax[i].type) {
955 case EBML_UINT:
956 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
957 break;
958 case EBML_FLOAT:
959 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
960 break;
961 case EBML_STR:
962 case EBML_UTF8:
963 // the default may be NULL
964 if (syntax[i].def.s) {
965 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
966 *dst = av_strdup(syntax[i].def.s);
967 if (!*dst)
968 return AVERROR(ENOMEM);
969 }
970 break;
971 }
972
973 while (!res && !ebml_level_end(matroska))
974 res = ebml_parse(matroska, syntax, data);
975
976 return res;
977}
978
979static int ebml_parse_elem(MatroskaDemuxContext *matroska,
980 EbmlSyntax *syntax, void *data)
981{
982 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
983 [EBML_UINT] = 8,
984 [EBML_FLOAT] = 8,
985 // max. 16 MB for strings
986 [EBML_STR] = 0x1000000,
987 [EBML_UTF8] = 0x1000000,
988 // max. 256 MB for binary data
989 [EBML_BIN] = 0x10000000,
990 // no limits for anything else
991 };
992 AVIOContext *pb = matroska->ctx->pb;
993 uint32_t id = syntax->id;
994 uint64_t length;
995 int res;
996 void *newelem;
997
998 data = (char *) data + syntax->data_offset;
999 if (syntax->list_elem_size) {
1000 EbmlList *list = data;
1001 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1002 if (!newelem)
1003 return AVERROR(ENOMEM);
1004 list->elem = newelem;
1005 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1006 memset(data, 0, syntax->list_elem_size);
1007 list->nb_elem++;
1008 }
1009
1010 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
1011 matroska->current_id = 0;
1012 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1013 return res;
1014 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1015 av_log(matroska->ctx, AV_LOG_ERROR,
1016 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1017 length, max_lengths[syntax->type], syntax->type);
1018 return AVERROR_INVALIDDATA;
1019 }
1020 }
1021
1022 switch (syntax->type) {
1023 case EBML_UINT:
1024 res = ebml_read_uint(pb, length, data);
1025 break;
1026 case EBML_SINT:
1027 res = ebml_read_sint(pb, length, data);
1028 break;
1029 case EBML_FLOAT:
1030 res = ebml_read_float(pb, length, data);
1031 break;
1032 case EBML_STR:
1033 case EBML_UTF8:
1034 res = ebml_read_ascii(pb, length, data);
1035 break;
1036 case EBML_BIN:
1037 res = ebml_read_binary(pb, length, data);
1038 break;
1039 case EBML_NEST:
1040 if ((res = ebml_read_master(matroska, length)) < 0)
1041 return res;
1042 if (id == MATROSKA_ID_SEGMENT)
1043 matroska->segment_start = avio_tell(matroska->ctx->pb);
1044 return ebml_parse_nest(matroska, syntax->def.n, data);
1045 case EBML_PASS:
1046 return ebml_parse_id(matroska, syntax->def.n, id, data);
1047 case EBML_STOP:
1048 return 1;
1049 default:
1050 if (ffio_limit(pb, length) != length)
1051 return AVERROR(EIO);
1052 return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
1053 }
1054 if (res == AVERROR_INVALIDDATA)
1055 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1056 else if (res == AVERROR(EIO))
1057 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1058 return res;
1059}
1060
1061static void ebml_free(EbmlSyntax *syntax, void *data)
1062{
1063 int i, j;
1064 for (i = 0; syntax[i].id; i++) {
1065 void *data_off = (char *) data + syntax[i].data_offset;
1066 switch (syntax[i].type) {
1067 case EBML_STR:
1068 case EBML_UTF8:
1069 av_freep(data_off);
1070 break;
1071 case EBML_BIN:
1072 av_freep(&((EbmlBin *) data_off)->data);
1073 break;
1074 case EBML_NEST:
1075 if (syntax[i].list_elem_size) {
1076 EbmlList *list = data_off;
1077 char *ptr = list->elem;
1078 for (j = 0; j < list->nb_elem;
1079 j++, ptr += syntax[i].list_elem_size)
1080 ebml_free(syntax[i].def.n, ptr);
1081 av_free(list->elem);
1082 } else
1083 ebml_free(syntax[i].def.n, data_off);
1084 default:
1085 break;
1086 }
1087 }
1088}
1089
1090/*
1091 * Autodetecting...
1092 */
1093static int matroska_probe(AVProbeData *p)
1094{
1095 uint64_t total = 0;
1096 int len_mask = 0x80, size = 1, n = 1, i;
1097
1098 /* EBML header? */
1099 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1100 return 0;
1101
1102 /* length of header */
1103 total = p->buf[4];
1104 while (size <= 8 && !(total & len_mask)) {
1105 size++;
1106 len_mask >>= 1;
1107 }
1108 if (size > 8)
1109 return 0;
1110 total &= (len_mask - 1);
1111 while (n < size)
1112 total = (total << 8) | p->buf[4 + n++];
1113
1114 /* Does the probe data contain the whole header? */
1115 if (p->buf_size < 4 + size + total)
1116 return 0;
1117
1118 /* The header should contain a known document type. For now,
1119 * we don't parse the whole header but simply check for the
1120 * availability of that array of characters inside the header.
1121 * Not fully fool-proof, but good enough. */
1122 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1123 int probelen = strlen(matroska_doctypes[i]);
1124 if (total < probelen)
1125 continue;
1126 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1127 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1128 return AVPROBE_SCORE_MAX;
1129 }
1130
1131 // probably valid EBML header but no recognized doctype
1132 return AVPROBE_SCORE_EXTENSION;
1133}
1134
1135static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1136 int num)
1137{
1138 MatroskaTrack *tracks = matroska->tracks.elem;
1139 int i;
1140
1141 for (i = 0; i < matroska->tracks.nb_elem; i++)
1142 if (tracks[i].num == num)
1143 return &tracks[i];
1144
1145 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1146 return NULL;
1147}
1148
1149static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1150 MatroskaTrack *track)
1151{
1152 MatroskaTrackEncoding *encodings = track->encodings.elem;
1153 uint8_t *data = *buf;
1154 int isize = *buf_size;
1155 uint8_t *pkt_data = NULL;
1156 uint8_t av_unused *newpktdata;
1157 int pkt_size = isize;
1158 int result = 0;
1159 int olen;
1160
1161 if (pkt_size >= 10000000U)
1162 return AVERROR_INVALIDDATA;
1163
1164 switch (encodings[0].compression.algo) {
1165 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1166 {
1167 int header_size = encodings[0].compression.settings.size;
1168 uint8_t *header = encodings[0].compression.settings.data;
1169
1170 if (header_size && !header) {
1171 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1172 return -1;
1173 }
1174
1175 if (!header_size)
1176 return 0;
1177
1178 pkt_size = isize + header_size;
1179 pkt_data = av_malloc(pkt_size);
1180 if (!pkt_data)
1181 return AVERROR(ENOMEM);
1182
1183 memcpy(pkt_data, header, header_size);
1184 memcpy(pkt_data + header_size, data, isize);
1185 break;
1186 }
1187#if CONFIG_LZO
1188 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1189 do {
1190 olen = pkt_size *= 3;
1191 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1192 if (!newpktdata) {
1193 result = AVERROR(ENOMEM);
1194 goto failed;
1195 }
1196 pkt_data = newpktdata;
1197 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1198 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1199 if (result) {
1200 result = AVERROR_INVALIDDATA;
1201 goto failed;
1202 }
1203 pkt_size -= olen;
1204 break;
1205#endif
1206#if CONFIG_ZLIB
1207 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1208 {
1209 z_stream zstream = { 0 };
1210 if (inflateInit(&zstream) != Z_OK)
1211 return -1;
1212 zstream.next_in = data;
1213 zstream.avail_in = isize;
1214 do {
1215 pkt_size *= 3;
1216 newpktdata = av_realloc(pkt_data, pkt_size);
1217 if (!newpktdata) {
1218 inflateEnd(&zstream);
1219 goto failed;
1220 }
1221 pkt_data = newpktdata;
1222 zstream.avail_out = pkt_size - zstream.total_out;
1223 zstream.next_out = pkt_data + zstream.total_out;
1224 if (pkt_data) {
1225 result = inflate(&zstream, Z_NO_FLUSH);
1226 } else
1227 result = Z_MEM_ERROR;
1228 } while (result == Z_OK && pkt_size < 10000000);
1229 pkt_size = zstream.total_out;
1230 inflateEnd(&zstream);
1231 if (result != Z_STREAM_END) {
1232 if (result == Z_MEM_ERROR)
1233 result = AVERROR(ENOMEM);
1234 else
1235 result = AVERROR_INVALIDDATA;
1236 goto failed;
1237 }
1238 break;
1239 }
1240#endif
1241#if CONFIG_BZLIB
1242 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1243 {
1244 bz_stream bzstream = { 0 };
1245 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1246 return -1;
1247 bzstream.next_in = data;
1248 bzstream.avail_in = isize;
1249 do {
1250 pkt_size *= 3;
1251 newpktdata = av_realloc(pkt_data, pkt_size);
1252 if (!newpktdata) {
1253 BZ2_bzDecompressEnd(&bzstream);
1254 goto failed;
1255 }
1256 pkt_data = newpktdata;
1257 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1258 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1259 if (pkt_data) {
1260 result = BZ2_bzDecompress(&bzstream);
1261 } else
1262 result = BZ_MEM_ERROR;
1263 } while (result == BZ_OK && pkt_size < 10000000);
1264 pkt_size = bzstream.total_out_lo32;
1265 BZ2_bzDecompressEnd(&bzstream);
1266 if (result != BZ_STREAM_END) {
1267 if (result == BZ_MEM_ERROR)
1268 result = AVERROR(ENOMEM);
1269 else
1270 result = AVERROR_INVALIDDATA;
1271 goto failed;
1272 }
1273 break;
1274 }
1275#endif
1276 default:
1277 return AVERROR_INVALIDDATA;
1278 }
1279
1280 *buf = pkt_data;
1281 *buf_size = pkt_size;
1282 return 0;
1283
1284failed:
1285 av_free(pkt_data);
1286 return result;
1287}
1288
1289static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1290 AVDictionary **metadata, char *prefix)
1291{
1292 MatroskaTag *tags = list->elem;
1293 char key[1024];
1294 int i;
1295
1296 for (i = 0; i < list->nb_elem; i++) {
1297 const char *lang = tags[i].lang &&
1298 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1299
1300 if (!tags[i].name) {
1301 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1302 continue;
1303 }
1304 if (prefix)
1305 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1306 else
1307 av_strlcpy(key, tags[i].name, sizeof(key));
1308 if (tags[i].def || !lang) {
1309 av_dict_set(metadata, key, tags[i].string, 0);
1310 if (tags[i].sub.nb_elem)
1311 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1312 }
1313 if (lang) {
1314 av_strlcat(key, "-", sizeof(key));
1315 av_strlcat(key, lang, sizeof(key));
1316 av_dict_set(metadata, key, tags[i].string, 0);
1317 if (tags[i].sub.nb_elem)
1318 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1319 }
1320 }
1321 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1322}
1323
1324static void matroska_convert_tags(AVFormatContext *s)
1325{
1326 MatroskaDemuxContext *matroska = s->priv_data;
1327 MatroskaTags *tags = matroska->tags.elem;
1328 int i, j;
1329
1330 for (i = 0; i < matroska->tags.nb_elem; i++) {
1331 if (tags[i].target.attachuid) {
1332 MatroskaAttachment *attachment = matroska->attachments.elem;
1333 for (j = 0; j < matroska->attachments.nb_elem; j++)
1334 if (attachment[j].uid == tags[i].target.attachuid &&
1335 attachment[j].stream)
1336 matroska_convert_tag(s, &tags[i].tag,
1337 &attachment[j].stream->metadata, NULL);
1338 } else if (tags[i].target.chapteruid) {
1339 MatroskaChapter *chapter = matroska->chapters.elem;
1340 for (j = 0; j < matroska->chapters.nb_elem; j++)
1341 if (chapter[j].uid == tags[i].target.chapteruid &&
1342 chapter[j].chapter)
1343 matroska_convert_tag(s, &tags[i].tag,
1344 &chapter[j].chapter->metadata, NULL);
1345 } else if (tags[i].target.trackuid) {
1346 MatroskaTrack *track = matroska->tracks.elem;
1347 for (j = 0; j < matroska->tracks.nb_elem; j++)
1348 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1349 matroska_convert_tag(s, &tags[i].tag,
1350 &track[j].stream->metadata, NULL);
1351 } else {
1352 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1353 tags[i].target.type);
1354 }
1355 }
1356}
1357
1358static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1359 int idx)
1360{
1361 EbmlList *seekhead_list = &matroska->seekhead;
1362 uint32_t level_up = matroska->level_up;
1363 uint32_t saved_id = matroska->current_id;
1364 MatroskaSeekhead *seekhead = seekhead_list->elem;
1365 int64_t before_pos = avio_tell(matroska->ctx->pb);
1366 MatroskaLevel level;
1367 int64_t offset;
1368 int ret = 0;
1369
1370 if (idx >= seekhead_list->nb_elem ||
1371 seekhead[idx].id == MATROSKA_ID_SEEKHEAD ||
1372 seekhead[idx].id == MATROSKA_ID_CLUSTER)
1373 return 0;
1374
1375 /* seek */
1376 offset = seekhead[idx].pos + matroska->segment_start;
1377 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1378 /* We don't want to lose our seekhead level, so we add
1379 * a dummy. This is a crude hack. */
1380 if (matroska->num_levels == EBML_MAX_DEPTH) {
1381 av_log(matroska->ctx, AV_LOG_INFO,
1382 "Max EBML element depth (%d) reached, "
1383 "cannot parse further.\n", EBML_MAX_DEPTH);
1384 ret = AVERROR_INVALIDDATA;
1385 } else {
1386 level.start = 0;
1387 level.length = (uint64_t) -1;
1388 matroska->levels[matroska->num_levels] = level;
1389 matroska->num_levels++;
1390 matroska->current_id = 0;
1391
1392 ret = ebml_parse(matroska, matroska_segment, matroska);
1393
1394 /* remove dummy level */
1395 while (matroska->num_levels) {
1396 uint64_t length = matroska->levels[--matroska->num_levels].length;
1397 if (length == (uint64_t) -1)
1398 break;
1399 }
1400 }
1401 }
1402 /* seek back */
1403 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1404 matroska->level_up = level_up;
1405 matroska->current_id = saved_id;
1406
1407 return ret;
1408}
1409
1410static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1411{
1412 EbmlList *seekhead_list = &matroska->seekhead;
1413 int64_t before_pos = avio_tell(matroska->ctx->pb);
1414 int i;
1415
1416 // we should not do any seeking in the streaming case
1417 if (!matroska->ctx->pb->seekable ||
1418 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1419 return;
1420
1421 for (i = 0; i < seekhead_list->nb_elem; i++) {
1422 MatroskaSeekhead *seekhead = seekhead_list->elem;
1423 if (seekhead[i].pos <= before_pos)
1424 continue;
1425
1426 // defer cues parsing until we actually need cue data.
1427 if (seekhead[i].id == MATROSKA_ID_CUES) {
1428 matroska->cues_parsing_deferred = 1;
1429 continue;
1430 }
1431
1432 if (matroska_parse_seekhead_entry(matroska, i) < 0) {
1433 // mark index as broken
1434 matroska->cues_parsing_deferred = -1;
1435 break;
1436 }
1437 }
1438}
1439
1440static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1441{
1442 EbmlList *index_list;
1443 MatroskaIndex *index;
1444 int index_scale = 1;
1445 int i, j;
1446
1447 index_list = &matroska->index;
1448 index = index_list->elem;
1449 if (index_list->nb_elem &&
1450 index[0].time > 1E14 / matroska->time_scale) {
1451 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1452 index_scale = matroska->time_scale;
1453 }
1454 for (i = 0; i < index_list->nb_elem; i++) {
1455 EbmlList *pos_list = &index[i].pos;
1456 MatroskaIndexPos *pos = pos_list->elem;
1457 for (j = 0; j < pos_list->nb_elem; j++) {
1458 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1459 pos[j].track);
1460 if (track && track->stream)
1461 av_add_index_entry(track->stream,
1462 pos[j].pos + matroska->segment_start,
1463 index[i].time / index_scale, 0, 0,
1464 AVINDEX_KEYFRAME);
1465 }
1466 }
1467}
1468
1469static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1470 EbmlList *seekhead_list = &matroska->seekhead;
1471 MatroskaSeekhead *seekhead = seekhead_list->elem;
1472 int i;
1473
1474 for (i = 0; i < seekhead_list->nb_elem; i++)
1475 if (seekhead[i].id == MATROSKA_ID_CUES)
1476 break;
1477 av_assert1(i <= seekhead_list->nb_elem);
1478
1479 if (matroska_parse_seekhead_entry(matroska, i) < 0)
1480 matroska->cues_parsing_deferred = -1;
1481 matroska_add_index_entries(matroska);
1482}
1483
1484static int matroska_aac_profile(char *codec_id)
1485{
1486 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1487 int profile;
1488
1489 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1490 if (strstr(codec_id, aac_profiles[profile]))
1491 break;
1492 return profile + 1;
1493}
1494
1495static int matroska_aac_sri(int samplerate)
1496{
1497 int sri;
1498
1499 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1500 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1501 break;
1502 return sri;
1503}
1504
1505static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1506{
1507 char buffer[32];
1508 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1509 time_t creation_time = date_utc / 1000000000 + 978307200;
1510 struct tm *ptm = gmtime(&creation_time);
1511 if (!ptm) return;
1512 strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
1513 av_dict_set(metadata, "creation_time", buffer, 0);
1514}
1515
1516static int matroska_parse_flac(AVFormatContext *s,
1517 MatroskaTrack *track,
1518 int *offset)
1519{
1520 AVStream *st = track->stream;
1521 uint8_t *p = track->codec_priv.data;
1522 int size = track->codec_priv.size;
1523
1524 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1525 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1526 track->codec_priv.size = 0;
1527 return 0;
1528 }
1529 *offset = 8;
1530 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1531
1532 p += track->codec_priv.size;
1533 size -= track->codec_priv.size;
1534
1535 /* parse the remaining metadata blocks if present */
1536 while (size >= 4) {
1537 int block_last, block_type, block_size;
1538
1539 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1540
1541 p += 4;
1542 size -= 4;
1543 if (block_size > size)
1544 return 0;
1545
1546 /* check for the channel mask */
1547 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1548 AVDictionary *dict = NULL;
1549 AVDictionaryEntry *chmask;
1550
1551 ff_vorbis_comment(s, &dict, p, block_size, 0);
1552 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1553 if (chmask) {
1554 uint64_t mask = strtol(chmask->value, NULL, 0);
1555 if (!mask || mask & ~0x3ffffULL) {
1556 av_log(s, AV_LOG_WARNING,
1557 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1558 } else
1559 st->codec->channel_layout = mask;
1560 }
1561 av_dict_free(&dict);
1562 }
1563
1564 p += block_size;
1565 size -= block_size;
1566 }
1567
1568 return 0;
1569}
1570
1571static int matroska_parse_tracks(AVFormatContext *s)
1572{
1573 MatroskaDemuxContext *matroska = s->priv_data;
1574 MatroskaTrack *tracks = matroska->tracks.elem;
1575 AVStream *st;
1576 int i, j, ret;
1577 int k;
1578
1579 for (i = 0; i < matroska->tracks.nb_elem; i++) {
1580 MatroskaTrack *track = &tracks[i];
1581 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1582 EbmlList *encodings_list = &track->encodings;
1583 MatroskaTrackEncoding *encodings = encodings_list->elem;
1584 uint8_t *extradata = NULL;
1585 int extradata_size = 0;
1586 int extradata_offset = 0;
1587 uint32_t fourcc = 0;
1588 AVIOContext b;
1589 char* key_id_base64 = NULL;
1590 int bit_depth = -1;
1591
1592 /* Apply some sanity checks. */
1593 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1594 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1595 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
1596 track->type != MATROSKA_TRACK_TYPE_METADATA) {
1597 av_log(matroska->ctx, AV_LOG_INFO,
1598 "Unknown or unsupported track type %"PRIu64"\n",
1599 track->type);
1600 continue;
1601 }
1602 if (!track->codec_id)
1603 continue;
1604
1605 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1606 if (!track->default_duration && track->video.frame_rate > 0)
1607 track->default_duration = 1000000000 / track->video.frame_rate;
1608 if (track->video.display_width == -1)
1609 track->video.display_width = track->video.pixel_width;
1610 if (track->video.display_height == -1)
1611 track->video.display_height = track->video.pixel_height;
1612 if (track->video.color_space.size == 4)
1613 fourcc = AV_RL32(track->video.color_space.data);
1614 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1615 if (!track->audio.out_samplerate)
1616 track->audio.out_samplerate = track->audio.samplerate;
1617 }
1618 if (encodings_list->nb_elem > 1) {
1619 av_log(matroska->ctx, AV_LOG_ERROR,
1620 "Multiple combined encodings not supported");
1621 } else if (encodings_list->nb_elem == 1) {
1622 if (encodings[0].type) {
1623 if (encodings[0].encryption.key_id.size > 0) {
1624 /* Save the encryption key id to be stored later as a
1625 metadata tag. */
1626 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
1627 key_id_base64 = av_malloc(b64_size);
1628 if (key_id_base64 == NULL)
1629 return AVERROR(ENOMEM);
1630
1631 av_base64_encode(key_id_base64, b64_size,
1632 encodings[0].encryption.key_id.data,
1633 encodings[0].encryption.key_id.size);
1634 } else {
1635 encodings[0].scope = 0;
1636 av_log(matroska->ctx, AV_LOG_ERROR,
1637 "Unsupported encoding type");
1638 }
1639 } else if (
1640#if CONFIG_ZLIB
1641 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1642#endif
1643#if CONFIG_BZLIB
1644 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1645#endif
1646#if CONFIG_LZO
1647 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1648#endif
1649 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
1650 encodings[0].scope = 0;
1651 av_log(matroska->ctx, AV_LOG_ERROR,
1652 "Unsupported encoding type");
1653 } else if (track->codec_priv.size && encodings[0].scope & 2) {
1654 uint8_t *codec_priv = track->codec_priv.data;
1655 int ret = matroska_decode_buffer(&track->codec_priv.data,
1656 &track->codec_priv.size,
1657 track);
1658 if (ret < 0) {
1659 track->codec_priv.data = NULL;
1660 track->codec_priv.size = 0;
1661 av_log(matroska->ctx, AV_LOG_ERROR,
1662 "Failed to decode codec private data\n");
1663 }
1664
1665 if (codec_priv != track->codec_priv.data)
1666 av_free(codec_priv);
1667 }
1668 }
1669
1670 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
1671 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1672 strlen(ff_mkv_codec_tags[j].str))) {
1673 codec_id = ff_mkv_codec_tags[j].id;
1674 break;
1675 }
1676 }
1677
1678 st = track->stream = avformat_new_stream(s, NULL);
1679 if (!st) {
1680 av_free(key_id_base64);
1681 return AVERROR(ENOMEM);
1682 }
1683
1684 if (key_id_base64) {
1685 /* export encryption key id as base64 metadata tag */
1686 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
1687 av_freep(&key_id_base64);
1688 }
1689
1690 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
1691 track->codec_priv.size >= 40 &&
1692 track->codec_priv.data) {
1693 track->ms_compat = 1;
1694 bit_depth = AV_RL16(track->codec_priv.data + 14);
1695 fourcc = AV_RL32(track->codec_priv.data + 16);
1696 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
1697 fourcc);
1698 if (!codec_id)
1699 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
1700 fourcc);
1701 extradata_offset = 40;
1702 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
1703 track->codec_priv.size >= 14 &&
1704 track->codec_priv.data) {
1705 int ret;
1706 ffio_init_context(&b, track->codec_priv.data,
1707 track->codec_priv.size,
1708 0, NULL, NULL, NULL, NULL);
1709 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1710 if (ret < 0)
1711 return ret;
1712 codec_id = st->codec->codec_id;
1713 extradata_offset = FFMIN(track->codec_priv.size, 18);
1714 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
1715 && (track->codec_priv.size >= 86)
1716 && (track->codec_priv.data)) {
1717 fourcc = AV_RL32(track->codec_priv.data + 4);
1718 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1719 if (ff_codec_get_id(ff_codec_movaudio_tags, AV_RL32(track->codec_priv.data))) {
1720 fourcc = AV_RL32(track->codec_priv.data);
1721 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
1722 }
1723 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1724 (track->codec_priv.size >= 21) &&
1725 (track->codec_priv.data)) {
1726 fourcc = AV_RL32(track->codec_priv.data + 4);
1727 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1728 if (ff_codec_get_id(ff_codec_movvideo_tags, AV_RL32(track->codec_priv.data))) {
1729 fourcc = AV_RL32(track->codec_priv.data);
1730 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
1731 }
1732 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI "))
1733 codec_id = AV_CODEC_ID_SVQ3;
1734 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1735 switch (track->audio.bitdepth) {
1736 case 8:
1737 codec_id = AV_CODEC_ID_PCM_U8;
1738 break;
1739 case 24:
1740 codec_id = AV_CODEC_ID_PCM_S24BE;
1741 break;
1742 case 32:
1743 codec_id = AV_CODEC_ID_PCM_S32BE;
1744 break;
1745 }
1746 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1747 switch (track->audio.bitdepth) {
1748 case 8:
1749 codec_id = AV_CODEC_ID_PCM_U8;
1750 break;
1751 case 24:
1752 codec_id = AV_CODEC_ID_PCM_S24LE;
1753 break;
1754 case 32:
1755 codec_id = AV_CODEC_ID_PCM_S32LE;
1756 break;
1757 }
1758 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
1759 track->audio.bitdepth == 64) {
1760 codec_id = AV_CODEC_ID_PCM_F64LE;
1761 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1762 int profile = matroska_aac_profile(track->codec_id);
1763 int sri = matroska_aac_sri(track->audio.samplerate);
1764 extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1765 if (!extradata)
1766 return AVERROR(ENOMEM);
1767 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
1768 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
1769 if (strstr(track->codec_id, "SBR")) {
1770 sri = matroska_aac_sri(track->audio.out_samplerate);
1771 extradata[2] = 0x56;
1772 extradata[3] = 0xE5;
1773 extradata[4] = 0x80 | (sri << 3);
1774 extradata_size = 5;
1775 } else
1776 extradata_size = 2;
1777 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - FF_INPUT_BUFFER_PADDING_SIZE) {
1778 /* Only ALAC's magic cookie is stored in Matroska's track headers.
1779 * Create the "atom size", "tag", and "tag version" fields the
1780 * decoder expects manually. */
1781 extradata_size = 12 + track->codec_priv.size;
1782 extradata = av_mallocz(extradata_size +
1783 FF_INPUT_BUFFER_PADDING_SIZE);
1784 if (!extradata)
1785 return AVERROR(ENOMEM);
1786 AV_WB32(extradata, extradata_size);
1787 memcpy(&extradata[4], "alac", 4);
1788 AV_WB32(&extradata[8], 0);
1789 memcpy(&extradata[12], track->codec_priv.data,
1790 track->codec_priv.size);
1791 } else if (codec_id == AV_CODEC_ID_TTA) {
1792 extradata_size = 30;
1793 extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1794 if (!extradata)
1795 return AVERROR(ENOMEM);
1796 ffio_init_context(&b, extradata, extradata_size, 1,
1797 NULL, NULL, NULL, NULL);
1798 avio_write(&b, "TTA1", 4);
1799 avio_wl16(&b, 1);
1800 avio_wl16(&b, track->audio.channels);
1801 avio_wl16(&b, track->audio.bitdepth);
1802 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
1803 return AVERROR_INVALIDDATA;
1804 avio_wl32(&b, track->audio.out_samplerate);
1805 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
1806 track->audio.out_samplerate,
1807 AV_TIME_BASE * 1000));
1808 } else if (codec_id == AV_CODEC_ID_RV10 ||
1809 codec_id == AV_CODEC_ID_RV20 ||
1810 codec_id == AV_CODEC_ID_RV30 ||
1811 codec_id == AV_CODEC_ID_RV40) {
1812 extradata_offset = 26;
1813 } else if (codec_id == AV_CODEC_ID_RA_144) {
1814 track->audio.out_samplerate = 8000;
1815 track->audio.channels = 1;
1816 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
1817 codec_id == AV_CODEC_ID_COOK ||
1818 codec_id == AV_CODEC_ID_ATRAC3 ||
1819 codec_id == AV_CODEC_ID_SIPR)
1820 && track->codec_priv.data) {
1821 int flavor;
1822
1823 ffio_init_context(&b, track->codec_priv.data,
1824 track->codec_priv.size,
1825 0, NULL, NULL, NULL, NULL);
1826 avio_skip(&b, 22);
1827 flavor = avio_rb16(&b);
1828 track->audio.coded_framesize = avio_rb32(&b);
1829 avio_skip(&b, 12);
1830 track->audio.sub_packet_h = avio_rb16(&b);
1831 track->audio.frame_size = avio_rb16(&b);
1832 track->audio.sub_packet_size = avio_rb16(&b);
1833 if (flavor < 0 ||
1834 track->audio.coded_framesize <= 0 ||
1835 track->audio.sub_packet_h <= 0 ||
1836 track->audio.frame_size <= 0 ||
1837 track->audio.sub_packet_size <= 0)
1838 return AVERROR_INVALIDDATA;
1839 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
1840 track->audio.frame_size);
1841 if (!track->audio.buf)
1842 return AVERROR(ENOMEM);
1843 if (codec_id == AV_CODEC_ID_RA_288) {
1844 st->codec->block_align = track->audio.coded_framesize;
1845 track->codec_priv.size = 0;
1846 } else {
1847 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1848 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1849 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1850 st->codec->bit_rate = sipr_bit_rate[flavor];
1851 }
1852 st->codec->block_align = track->audio.sub_packet_size;
1853 extradata_offset = 78;
1854 }
1855 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
1856 ret = matroska_parse_flac(s, track, &extradata_offset);
1857 if (ret < 0)
1858 return ret;
1859 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
1860 fourcc = AV_RL32(track->codec_priv.data);
1861 }
1862 track->codec_priv.size -= extradata_offset;
1863
1864 if (codec_id == AV_CODEC_ID_NONE)
1865 av_log(matroska->ctx, AV_LOG_INFO,
1866 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1867
1868 if (track->time_scale < 0.01)
1869 track->time_scale = 1.0;
1870 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1871 1000 * 1000 * 1000); /* 64 bit pts in ns */
1872
1873 /* convert the delay from ns to the track timebase */
1874 track->codec_delay = av_rescale_q(track->codec_delay,
1875 (AVRational){ 1, 1000000000 },
1876 st->time_base);
1877
1878 st->codec->codec_id = codec_id;
1879
1880 if (strcmp(track->language, "und"))
1881 av_dict_set(&st->metadata, "language", track->language, 0);
1882 av_dict_set(&st->metadata, "title", track->name, 0);
1883
1884 if (track->flag_default)
1885 st->disposition |= AV_DISPOSITION_DEFAULT;
1886 if (track->flag_forced)
1887 st->disposition |= AV_DISPOSITION_FORCED;
1888
1889 if (!st->codec->extradata) {
1890 if (extradata) {
1891 st->codec->extradata = extradata;
1892 st->codec->extradata_size = extradata_size;
1893 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
1894 if (ff_alloc_extradata(st->codec, track->codec_priv.size))
1895 return AVERROR(ENOMEM);
1896 memcpy(st->codec->extradata,
1897 track->codec_priv.data + extradata_offset,
1898 track->codec_priv.size);
1899 }
1900 }
1901
1902 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1903 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
1904
1905 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1906 st->codec->codec_tag = fourcc;
1907 if (bit_depth >= 0)
1908 st->codec->bits_per_coded_sample = bit_depth;
1909 st->codec->width = track->video.pixel_width;
1910 st->codec->height = track->video.pixel_height;
1911 av_reduce(&st->sample_aspect_ratio.num,
1912 &st->sample_aspect_ratio.den,
1913 st->codec->height * track->video.display_width,
1914 st->codec->width * track->video.display_height,
1915 255);
1916 if (st->codec->codec_id != AV_CODEC_ID_HEVC)
1917 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1918
1919 if (track->default_duration) {
1920 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1921 1000000000, track->default_duration, 30000);
1922#if FF_API_R_FRAME_RATE
1923 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000L
1924 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5L)
1925 st->r_frame_rate = st->avg_frame_rate;
1926#endif
1927 }
1928
1929 /* export stereo mode flag as metadata tag */
1930 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
1931 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
1932
1933 /* export alpha mode flag as metadata tag */
1934 if (track->video.alpha_mode)
1935 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
1936
1937 /* if we have virtual track, mark the real tracks */
1938 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
1939 char buf[32];
1940 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
1941 continue;
1942 snprintf(buf, sizeof(buf), "%s_%d",
1943 ff_matroska_video_stereo_plane[planes[j].type], i);
1944 for (k=0; k < matroska->tracks.nb_elem; k++)
1945 if (planes[j].uid == tracks[k].uid) {
1946 av_dict_set(&s->streams[k]->metadata,
1947 "stereo_mode", buf, 0);
1948 break;
1949 }
1950 }
1951 // add stream level stereo3d side data if it is a supported format
1952 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
1953 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
1954 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
1955 if (ret < 0)
1956 return ret;
1957 }
1958 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1959 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1960 st->codec->sample_rate = track->audio.out_samplerate;
1961 st->codec->channels = track->audio.channels;
1962 if (!st->codec->bits_per_coded_sample)
1963 st->codec->bits_per_coded_sample = track->audio.bitdepth;
1964 if (st->codec->codec_id != AV_CODEC_ID_AAC)
1965 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1966 if (track->codec_delay > 0) {
1967 st->codec->delay = av_rescale_q(track->codec_delay,
1968 st->time_base,
1969 (AVRational){1, st->codec->sample_rate});
1970 }
1971 if (track->seek_preroll > 0) {
1972 av_codec_set_seek_preroll(st->codec,
1973 av_rescale_q(track->seek_preroll,
1974 (AVRational){1, 1000000000},
1975 (AVRational){1, st->codec->sample_rate}));
1976 }
1977 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
1978 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1979
1980 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
1981 st->disposition |= AV_DISPOSITION_CAPTIONS;
1982 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
1983 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1984 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
1985 st->disposition |= AV_DISPOSITION_METADATA;
1986 }
1987 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1988 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1989 if (st->codec->codec_id == AV_CODEC_ID_ASS)
1990 matroska->contains_ssa = 1;
1991 }
1992 }
1993
1994 return 0;
1995}
1996
1997static int matroska_read_header(AVFormatContext *s)
1998{
1999 MatroskaDemuxContext *matroska = s->priv_data;
2000 EbmlList *attachments_list = &matroska->attachments;
2001 EbmlList *chapters_list = &matroska->chapters;
2002 MatroskaAttachment *attachments;
2003 MatroskaChapter *chapters;
2004 uint64_t max_start = 0;
2005 int64_t pos;
2006 Ebml ebml = { 0 };
2007 int i, j, res;
2008
2009 matroska->ctx = s;
2010
2011 /* First read the EBML header. */
2012 if (ebml_parse(matroska, ebml_syntax, &ebml) ||
2013 ebml.version > EBML_VERSION ||
2014 ebml.max_size > sizeof(uint64_t) ||
2015 ebml.id_length > sizeof(uint32_t) ||
2016 ebml.doctype_version > 3 ||
2017 !ebml.doctype) {
2018 av_log(matroska->ctx, AV_LOG_ERROR,
2019 "EBML header using unsupported features\n"
2020 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2021 ebml.version, ebml.doctype, ebml.doctype_version);
2022 ebml_free(ebml_syntax, &ebml);
2023 return AVERROR_PATCHWELCOME;
2024 } else if (ebml.doctype_version == 3) {
2025 av_log(matroska->ctx, AV_LOG_WARNING,
2026 "EBML header using unsupported features\n"
2027 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2028 ebml.version, ebml.doctype, ebml.doctype_version);
2029 }
2030 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2031 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2032 break;
2033 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2034 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2035 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2036 ebml_free(ebml_syntax, &ebml);
2037 return AVERROR_INVALIDDATA;
2038 }
2039 }
2040 ebml_free(ebml_syntax, &ebml);
2041
2042 /* The next thing is a segment. */
2043 pos = avio_tell(matroska->ctx->pb);
2044 res = ebml_parse(matroska, matroska_segments, matroska);
2045 // try resyncing until we find a EBML_STOP type element.
2046 while (res != 1) {
2047 res = matroska_resync(matroska, pos);
2048 if (res < 0)
2049 return res;
2050 pos = avio_tell(matroska->ctx->pb);
2051 res = ebml_parse(matroska, matroska_segment, matroska);
2052 }
2053 matroska_execute_seekhead(matroska);
2054
2055 if (!matroska->time_scale)
2056 matroska->time_scale = 1000000;
2057 if (matroska->duration)
2058 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2059 1000 / AV_TIME_BASE;
2060 av_dict_set(&s->metadata, "title", matroska->title, 0);
2061 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2062
2063 if (matroska->date_utc.size == 8)
2064 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2065
2066 res = matroska_parse_tracks(s);
2067 if (res < 0)
2068 return res;
2069
2070 attachments = attachments_list->elem;
2071 for (j = 0; j < attachments_list->nb_elem; j++) {
2072 if (!(attachments[j].filename && attachments[j].mime &&
2073 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2074 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2075 } else {
2076 AVStream *st = avformat_new_stream(s, NULL);
2077 if (!st)
2078 break;
2079 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2080 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2081 st->codec->codec_id = AV_CODEC_ID_NONE;
2082 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2083 if (ff_alloc_extradata(st->codec, attachments[j].bin.size))
2084 break;
2085 memcpy(st->codec->extradata, attachments[j].bin.data,
2086 attachments[j].bin.size);
2087
2088 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2089 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2090 strlen(ff_mkv_mime_tags[i].str))) {
2091 st->codec->codec_id = ff_mkv_mime_tags[i].id;
2092 break;
2093 }
2094 }
2095 attachments[j].stream = st;
2096 }
2097 }
2098
2099 chapters = chapters_list->elem;
2100 for (i = 0; i < chapters_list->nb_elem; i++)
2101 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2102 (max_start == 0 || chapters[i].start > max_start)) {
2103 chapters[i].chapter =
2104 avpriv_new_chapter(s, chapters[i].uid,
2105 (AVRational) { 1, 1000000000 },
2106 chapters[i].start, chapters[i].end,
2107 chapters[i].title);
2108 if (chapters[i].chapter) {
2109 av_dict_set(&chapters[i].chapter->metadata,
2110 "title", chapters[i].title, 0);
2111 }
2112 max_start = chapters[i].start;
2113 }
2114
2115 matroska_add_index_entries(matroska);
2116
2117 matroska_convert_tags(s);
2118
2119 return 0;
2120}
2121
2122/*
2123 * Put one packet in an application-supplied AVPacket struct.
2124 * Returns 0 on success or -1 on failure.
2125 */
2126static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2127 AVPacket *pkt)
2128{
2129 if (matroska->num_packets > 0) {
2130 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2131 av_free(matroska->packets[0]);
2132 if (matroska->num_packets > 1) {
2133 void *newpackets;
2134 memmove(&matroska->packets[0], &matroska->packets[1],
2135 (matroska->num_packets - 1) * sizeof(AVPacket *));
2136 newpackets = av_realloc(matroska->packets,
2137 (matroska->num_packets - 1) *
2138 sizeof(AVPacket *));
2139 if (newpackets)
2140 matroska->packets = newpackets;
2141 } else {
2142 av_freep(&matroska->packets);
2143 matroska->prev_pkt = NULL;
2144 }
2145 matroska->num_packets--;
2146 return 0;
2147 }
2148
2149 return -1;
2150}
2151
2152/*
2153 * Free all packets in our internal queue.
2154 */
2155static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2156{
2157 matroska->prev_pkt = NULL;
2158 if (matroska->packets) {
2159 int n;
2160 for (n = 0; n < matroska->num_packets; n++) {
2161 av_free_packet(matroska->packets[n]);
2162 av_free(matroska->packets[n]);
2163 }
2164 av_freep(&matroska->packets);
2165 matroska->num_packets = 0;
2166 }
2167}
2168
2169static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2170 int *buf_size, int type,
2171 uint32_t **lace_buf, int *laces)
2172{
2173 int res = 0, n, size = *buf_size;
2174 uint8_t *data = *buf;
2175 uint32_t *lace_size;
2176
2177 if (!type) {
2178 *laces = 1;
2179 *lace_buf = av_mallocz(sizeof(int));
2180 if (!*lace_buf)
2181 return AVERROR(ENOMEM);
2182
2183 *lace_buf[0] = size;
2184 return 0;
2185 }
2186
2187 av_assert0(size > 0);
2188 *laces = *data + 1;
2189 data += 1;
2190 size -= 1;
2191 lace_size = av_mallocz(*laces * sizeof(int));
2192 if (!lace_size)
2193 return AVERROR(ENOMEM);
2194
2195 switch (type) {
2196 case 0x1: /* Xiph lacing */
2197 {
2198 uint8_t temp;
2199 uint32_t total = 0;
2200 for (n = 0; res == 0 && n < *laces - 1; n++) {
2201 while (1) {
2202 if (size <= total) {
2203 res = AVERROR_INVALIDDATA;
2204 break;
2205 }
2206 temp = *data;
2207 total += temp;
2208 lace_size[n] += temp;
2209 data += 1;
2210 size -= 1;
2211 if (temp != 0xff)
2212 break;
2213 }
2214 }
2215 if (size <= total) {
2216 res = AVERROR_INVALIDDATA;
2217 break;
2218 }
2219
2220 lace_size[n] = size - total;
2221 break;
2222 }
2223
2224 case 0x2: /* fixed-size lacing */
2225 if (size % (*laces)) {
2226 res = AVERROR_INVALIDDATA;
2227 break;
2228 }
2229 for (n = 0; n < *laces; n++)
2230 lace_size[n] = size / *laces;
2231 break;
2232
2233 case 0x3: /* EBML lacing */
2234 {
2235 uint64_t num;
2236 uint64_t total;
2237 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2238 if (n < 0 || num > INT_MAX) {
2239 av_log(matroska->ctx, AV_LOG_INFO,
2240 "EBML block data error\n");
2241 res = n<0 ? n : AVERROR_INVALIDDATA;
2242 break;
2243 }
2244 data += n;
2245 size -= n;
2246 total = lace_size[0] = num;
2247 for (n = 1; res == 0 && n < *laces - 1; n++) {
2248 int64_t snum;
2249 int r;
2250 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2251 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2252 av_log(matroska->ctx, AV_LOG_INFO,
2253 "EBML block data error\n");
2254 res = r<0 ? r : AVERROR_INVALIDDATA;
2255 break;
2256 }
2257 data += r;
2258 size -= r;
2259 lace_size[n] = lace_size[n - 1] + snum;
2260 total += lace_size[n];
2261 }
2262 if (size <= total) {
2263 res = AVERROR_INVALIDDATA;
2264 break;
2265 }
2266 lace_size[*laces - 1] = size - total;
2267 break;
2268 }
2269 }
2270
2271 *buf = data;
2272 *lace_buf = lace_size;
2273 *buf_size = size;
2274
2275 return res;
2276}
2277
2278static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2279 MatroskaTrack *track, AVStream *st,
2280 uint8_t *data, int size, uint64_t timecode,
2281 int64_t pos)
2282{
2283 int a = st->codec->block_align;
2284 int sps = track->audio.sub_packet_size;
2285 int cfs = track->audio.coded_framesize;
2286 int h = track->audio.sub_packet_h;
2287 int y = track->audio.sub_packet_cnt;
2288 int w = track->audio.frame_size;
2289 int x;
2290
2291 if (!track->audio.pkt_cnt) {
2292 if (track->audio.sub_packet_cnt == 0)
2293 track->audio.buf_timecode = timecode;
2294 if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
2295 if (size < cfs * h / 2) {
2296 av_log(matroska->ctx, AV_LOG_ERROR,
2297 "Corrupt int4 RM-style audio packet size\n");
2298 return AVERROR_INVALIDDATA;
2299 }
2300 for (x = 0; x < h / 2; x++)
2301 memcpy(track->audio.buf + x * 2 * w + y * cfs,
2302 data + x * cfs, cfs);
2303 } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
2304 if (size < w) {
2305 av_log(matroska->ctx, AV_LOG_ERROR,
2306 "Corrupt sipr RM-style audio packet size\n");
2307 return AVERROR_INVALIDDATA;
2308 }
2309 memcpy(track->audio.buf + y * w, data, w);
2310 } else {
2311 if (size < sps * w / sps || h<=0 || w%sps) {
2312 av_log(matroska->ctx, AV_LOG_ERROR,
2313 "Corrupt generic RM-style audio packet size\n");
2314 return AVERROR_INVALIDDATA;
2315 }
2316 for (x = 0; x < w / sps; x++)
2317 memcpy(track->audio.buf +
2318 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
2319 data + x * sps, sps);
2320 }
2321
2322 if (++track->audio.sub_packet_cnt >= h) {
2323 if (st->codec->codec_id == AV_CODEC_ID_SIPR)
2324 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
2325 track->audio.sub_packet_cnt = 0;
2326 track->audio.pkt_cnt = h * w / a;
2327 }
2328 }
2329
2330 while (track->audio.pkt_cnt) {
2331 AVPacket *pkt = NULL;
2332 if (!(pkt = av_mallocz(sizeof(AVPacket))) || av_new_packet(pkt, a) < 0) {
2333 av_free(pkt);
2334 return AVERROR(ENOMEM);
2335 }
2336 memcpy(pkt->data,
2337 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
2338 a);
2339 pkt->pts = track->audio.buf_timecode;
2340 track->audio.buf_timecode = AV_NOPTS_VALUE;
2341 pkt->pos = pos;
2342 pkt->stream_index = st->index;
2343 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2344 }
2345
2346 return 0;
2347}
2348
2349/* reconstruct full wavpack blocks from mangled matroska ones */
2350static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
2351 uint8_t **pdst, int *size)
2352{
2353 uint8_t *dst = NULL;
2354 int dstlen = 0;
2355 int srclen = *size;
2356 uint32_t samples;
2357 uint16_t ver;
2358 int ret, offset = 0;
2359
2360 if (srclen < 12 || track->stream->codec->extradata_size < 2)
2361 return AVERROR_INVALIDDATA;
2362
2363 ver = AV_RL16(track->stream->codec->extradata);
2364
2365 samples = AV_RL32(src);
2366 src += 4;
2367 srclen -= 4;
2368
2369 while (srclen >= 8) {
2370 int multiblock;
2371 uint32_t blocksize;
2372 uint8_t *tmp;
2373
2374 uint32_t flags = AV_RL32(src);
2375 uint32_t crc = AV_RL32(src + 4);
2376 src += 8;
2377 srclen -= 8;
2378
2379 multiblock = (flags & 0x1800) != 0x1800;
2380 if (multiblock) {
2381 if (srclen < 4) {
2382 ret = AVERROR_INVALIDDATA;
2383 goto fail;
2384 }
2385 blocksize = AV_RL32(src);
2386 src += 4;
2387 srclen -= 4;
2388 } else
2389 blocksize = srclen;
2390
2391 if (blocksize > srclen) {
2392 ret = AVERROR_INVALIDDATA;
2393 goto fail;
2394 }
2395
2396 tmp = av_realloc(dst, dstlen + blocksize + 32);
2397 if (!tmp) {
2398 ret = AVERROR(ENOMEM);
2399 goto fail;
2400 }
2401 dst = tmp;
2402 dstlen += blocksize + 32;
2403
2404 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
2405 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
2406 AV_WL16(dst + offset + 8, ver); // version
2407 AV_WL16(dst + offset + 10, 0); // track/index_no
2408 AV_WL32(dst + offset + 12, 0); // total samples
2409 AV_WL32(dst + offset + 16, 0); // block index
2410 AV_WL32(dst + offset + 20, samples); // number of samples
2411 AV_WL32(dst + offset + 24, flags); // flags
2412 AV_WL32(dst + offset + 28, crc); // crc
2413 memcpy(dst + offset + 32, src, blocksize); // block data
2414
2415 src += blocksize;
2416 srclen -= blocksize;
2417 offset += blocksize + 32;
2418 }
2419
2420 *pdst = dst;
2421 *size = dstlen;
2422
2423 return 0;
2424
2425fail:
2426 av_freep(&dst);
2427 return ret;
2428}
2429
2430static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
2431 MatroskaTrack *track,
2432 AVStream *st,
2433 uint8_t *data, int data_len,
2434 uint64_t timecode,
2435 uint64_t duration,
2436 int64_t pos)
2437{
2438 AVPacket *pkt;
2439 uint8_t *id, *settings, *text, *buf;
2440 int id_len, settings_len, text_len;
2441 uint8_t *p, *q;
2442 int err;
2443
2444 if (data_len <= 0)
2445 return AVERROR_INVALIDDATA;
2446
2447 p = data;
2448 q = data + data_len;
2449
2450 id = p;
2451 id_len = -1;
2452 while (p < q) {
2453 if (*p == '\r' || *p == '\n') {
2454 id_len = p - id;
2455 if (*p == '\r')
2456 p++;
2457 break;
2458 }
2459 p++;
2460 }
2461
2462 if (p >= q || *p != '\n')
2463 return AVERROR_INVALIDDATA;
2464 p++;
2465
2466 settings = p;
2467 settings_len = -1;
2468 while (p < q) {
2469 if (*p == '\r' || *p == '\n') {
2470 settings_len = p - settings;
2471 if (*p == '\r')
2472 p++;
2473 break;
2474 }
2475 p++;
2476 }
2477
2478 if (p >= q || *p != '\n')
2479 return AVERROR_INVALIDDATA;
2480 p++;
2481
2482 text = p;
2483 text_len = q - p;
2484 while (text_len > 0) {
2485 const int len = text_len - 1;
2486 const uint8_t c = p[len];
2487 if (c != '\r' && c != '\n')
2488 break;
2489 text_len = len;
2490 }
2491
2492 if (text_len <= 0)
2493 return AVERROR_INVALIDDATA;
2494
2495 pkt = av_mallocz(sizeof(*pkt));
2496 err = av_new_packet(pkt, text_len);
2497 if (err < 0) {
2498 av_free(pkt);
2499 return AVERROR(err);
2500 }
2501
2502 memcpy(pkt->data, text, text_len);
2503
2504 if (id_len > 0) {
2505 buf = av_packet_new_side_data(pkt,
2506 AV_PKT_DATA_WEBVTT_IDENTIFIER,
2507 id_len);
2508 if (!buf) {
2509 av_free(pkt);
2510 return AVERROR(ENOMEM);
2511 }
2512 memcpy(buf, id, id_len);
2513 }
2514
2515 if (settings_len > 0) {
2516 buf = av_packet_new_side_data(pkt,
2517 AV_PKT_DATA_WEBVTT_SETTINGS,
2518 settings_len);
2519 if (!buf) {
2520 av_free(pkt);
2521 return AVERROR(ENOMEM);
2522 }
2523 memcpy(buf, settings, settings_len);
2524 }
2525
2526 // Do we need this for subtitles?
2527 // pkt->flags = AV_PKT_FLAG_KEY;
2528
2529 pkt->stream_index = st->index;
2530 pkt->pts = timecode;
2531
2532 // Do we need this for subtitles?
2533 // pkt->dts = timecode;
2534
2535 pkt->duration = duration;
2536 pkt->pos = pos;
2537
2538 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2539 matroska->prev_pkt = pkt;
2540
2541 return 0;
2542}
2543
2544static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2545 MatroskaTrack *track, AVStream *st,
2546 uint8_t *data, int pkt_size,
2547 uint64_t timecode, uint64_t lace_duration,
2548 int64_t pos, int is_keyframe,
2549 uint8_t *additional, uint64_t additional_id, int additional_size,
2550 int64_t discard_padding)
2551{
2552 MatroskaTrackEncoding *encodings = track->encodings.elem;
2553 uint8_t *pkt_data = data;
2554 int offset = 0, res;
2555 AVPacket *pkt;
2556
2557 if (encodings && !encodings->type && encodings->scope & 1) {
2558 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
2559 if (res < 0)
2560 return res;
2561 }
2562
2563 if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) {
2564 uint8_t *wv_data;
2565 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
2566 if (res < 0) {
2567 av_log(matroska->ctx, AV_LOG_ERROR,
2568 "Error parsing a wavpack block.\n");
2569 goto fail;
2570 }
2571 if (pkt_data != data)
2572 av_freep(&pkt_data);
2573 pkt_data = wv_data;
2574 }
2575
2576 if (st->codec->codec_id == AV_CODEC_ID_PRORES &&
2577 AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
2578 offset = 8;
2579
2580 pkt = av_mallocz(sizeof(AVPacket));
2581 /* XXX: prevent data copy... */
2582 if (av_new_packet(pkt, pkt_size + offset) < 0) {
2583 av_free(pkt);
2584 res = AVERROR(ENOMEM);
2585 goto fail;
2586 }
2587
2588 if (st->codec->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
2589 uint8_t *buf = pkt->data;
2590 bytestream_put_be32(&buf, pkt_size);
2591 bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
2592 }
2593
2594 memcpy(pkt->data + offset, pkt_data, pkt_size);
2595
2596 if (pkt_data != data)
2597 av_freep(&pkt_data);
2598
2599 pkt->flags = is_keyframe;
2600 pkt->stream_index = st->index;
2601
2602 if (additional_size > 0) {
2603 uint8_t *side_data = av_packet_new_side_data(pkt,
2604 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
2605 additional_size + 8);
2606 if (!side_data) {
2607 av_free_packet(pkt);
2608 av_free(pkt);
2609 return AVERROR(ENOMEM);
2610 }
2611 AV_WB64(side_data, additional_id);
2612 memcpy(side_data + 8, additional, additional_size);
2613 }
2614
2615 if (discard_padding) {
2616 uint8_t *side_data = av_packet_new_side_data(pkt,
2617 AV_PKT_DATA_SKIP_SAMPLES,
2618 10);
2619 if (!side_data) {
2620 av_free_packet(pkt);
2621 av_free(pkt);
2622 return AVERROR(ENOMEM);
2623 }
2624 AV_WL32(side_data, 0);
2625 AV_WL32(side_data + 4, av_rescale_q(discard_padding,
2626 (AVRational){1, 1000000000},
2627 (AVRational){1, st->codec->sample_rate}));
2628 }
2629
2630 if (track->ms_compat)
2631 pkt->dts = timecode;
2632 else
2633 pkt->pts = timecode;
2634 pkt->pos = pos;
2635 if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
2636 /*
2637 * For backward compatibility.
2638 * Historically, we have put subtitle duration
2639 * in convergence_duration, on the off chance
2640 * that the time_scale is less than 1us, which
2641 * could result in a 32bit overflow on the
2642 * normal duration field.
2643 */
2644 pkt->convergence_duration = lace_duration;
2645 }
2646
2647 if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
2648 lace_duration <= INT_MAX) {
2649 /*
2650 * For non subtitle tracks, just store the duration
2651 * as normal.
2652 *
2653 * If it's a subtitle track and duration value does
2654 * not overflow a uint32, then also store it normally.
2655 */
2656 pkt->duration = lace_duration;
2657 }
2658
2659 dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2660 matroska->prev_pkt = pkt;
2661
2662 return 0;
2663
2664fail:
2665 if (pkt_data != data)
2666 av_freep(&pkt_data);
2667 return res;
2668}
2669
2670static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2671 int size, int64_t pos, uint64_t cluster_time,
2672 uint64_t block_duration, int is_keyframe,
2673 uint8_t *additional, uint64_t additional_id, int additional_size,
2674 int64_t cluster_pos, int64_t discard_padding)
2675{
2676 uint64_t timecode = AV_NOPTS_VALUE;
2677 MatroskaTrack *track;
2678 int res = 0;
2679 AVStream *st;
2680 int16_t block_time;
2681 uint32_t *lace_size = NULL;
2682 int n, flags, laces = 0;
2683 uint64_t num;
2684 int trust_default_duration = 1;
2685
2686 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2687 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2688 return n;
2689 }
2690 data += n;
2691 size -= n;
2692
2693 track = matroska_find_track_by_num(matroska, num);
2694 if (!track || !track->stream) {
2695 av_log(matroska->ctx, AV_LOG_INFO,
2696 "Invalid stream %"PRIu64" or size %u\n", num, size);
2697 return AVERROR_INVALIDDATA;
2698 } else if (size <= 3)
2699 return 0;
2700 st = track->stream;
2701 if (st->discard >= AVDISCARD_ALL)
2702 return res;
2703 av_assert1(block_duration != AV_NOPTS_VALUE);
2704
2705 block_time = sign_extend(AV_RB16(data), 16);
2706 data += 2;
2707 flags = *data++;
2708 size -= 3;
2709 if (is_keyframe == -1)
2710 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2711
2712 if (cluster_time != (uint64_t) -1 &&
2713 (block_time >= 0 || cluster_time >= -block_time)) {
2714 timecode = cluster_time + block_time - track->codec_delay;
2715 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2716 timecode < track->end_timecode)
2717 is_keyframe = 0; /* overlapping subtitles are not key frame */
2718 if (is_keyframe)
2719 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
2720 AVINDEX_KEYFRAME);
2721 }
2722
2723 if (matroska->skip_to_keyframe &&
2724 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2725 if (timecode < matroska->skip_to_timecode)
2726 return res;
2727 if (is_keyframe)
2728 matroska->skip_to_keyframe = 0;
2729 else if (!st->skip_to_keyframe) {
2730 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
2731 matroska->skip_to_keyframe = 0;
2732 }
2733 }
2734
2735 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2736 &lace_size, &laces);
2737
2738 if (res)
2739 goto end;
2740
2741 if (track->audio.samplerate == 8000) {
2742 // If this is needed for more codecs, then add them here
2743 if (st->codec->codec_id == AV_CODEC_ID_AC3) {
2744 if (track->audio.samplerate != st->codec->sample_rate || !st->codec->frame_size)
2745 trust_default_duration = 0;
2746 }
2747 }
2748
2749 if (!block_duration && trust_default_duration)
2750 block_duration = track->default_duration * laces / matroska->time_scale;
2751
2752 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
2753 track->end_timecode =
2754 FFMAX(track->end_timecode, timecode + block_duration);
2755
2756 for (n = 0; n < laces; n++) {
2757 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
2758
2759 if (lace_size[n] > size) {
2760 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
2761 break;
2762 }
2763
2764 if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2765 st->codec->codec_id == AV_CODEC_ID_COOK ||
2766 st->codec->codec_id == AV_CODEC_ID_SIPR ||
2767 st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2768 st->codec->block_align && track->audio.sub_packet_size) {
2769 res = matroska_parse_rm_audio(matroska, track, st, data,
2770 lace_size[n],
2771 timecode, pos);
2772 if (res)
2773 goto end;
2774
2775 } else if (st->codec->codec_id == AV_CODEC_ID_WEBVTT) {
2776 res = matroska_parse_webvtt(matroska, track, st,
2777 data, lace_size[n],
2778 timecode, lace_duration,
2779 pos);
2780 if (res)
2781 goto end;
2782 } else {
2783 res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2784 timecode, lace_duration, pos,
2785 !n ? is_keyframe : 0,
2786 additional, additional_id, additional_size,
2787 discard_padding);
2788 if (res)
2789 goto end;
2790 }
2791
2792 if (timecode != AV_NOPTS_VALUE)
2793 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
2794 data += lace_size[n];
2795 size -= lace_size[n];
2796 }
2797
2798end:
2799 av_free(lace_size);
2800 return res;
2801}
2802
2803static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2804{
2805 EbmlList *blocks_list;
2806 MatroskaBlock *blocks;
2807 int i, res;
2808 res = ebml_parse(matroska,
2809 matroska_cluster_incremental_parsing,
2810 &matroska->current_cluster);
2811 if (res == 1) {
2812 /* New Cluster */
2813 if (matroska->current_cluster_pos)
2814 ebml_level_end(matroska);
2815 ebml_free(matroska_cluster, &matroska->current_cluster);
2816 memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2817 matroska->current_cluster_num_blocks = 0;
2818 matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2819 matroska->prev_pkt = NULL;
2820 /* sizeof the ID which was already read */
2821 if (matroska->current_id)
2822 matroska->current_cluster_pos -= 4;
2823 res = ebml_parse(matroska,
2824 matroska_clusters_incremental,
2825 &matroska->current_cluster);
2826 /* Try parsing the block again. */
2827 if (res == 1)
2828 res = ebml_parse(matroska,
2829 matroska_cluster_incremental_parsing,
2830 &matroska->current_cluster);
2831 }
2832
2833 if (!res &&
2834 matroska->current_cluster_num_blocks <
2835 matroska->current_cluster.blocks.nb_elem) {
2836 blocks_list = &matroska->current_cluster.blocks;
2837 blocks = blocks_list->elem;
2838
2839 matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2840 i = blocks_list->nb_elem - 1;
2841 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2842 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2843 uint8_t* additional = blocks[i].additional.size > 0 ?
2844 blocks[i].additional.data : NULL;
2845 if (!blocks[i].non_simple)
2846 blocks[i].duration = 0;
2847 res = matroska_parse_block(matroska, blocks[i].bin.data,
2848 blocks[i].bin.size, blocks[i].bin.pos,
2849 matroska->current_cluster.timecode,
2850 blocks[i].duration, is_keyframe,
2851 additional, blocks[i].additional_id,
2852 blocks[i].additional.size,
2853 matroska->current_cluster_pos,
2854 blocks[i].discard_padding);
2855 }
2856 }
2857
2858 return res;
2859}
2860
2861static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2862{
2863 MatroskaCluster cluster = { 0 };
2864 EbmlList *blocks_list;
2865 MatroskaBlock *blocks;
2866 int i, res;
2867 int64_t pos;
2868
2869 if (!matroska->contains_ssa)
2870 return matroska_parse_cluster_incremental(matroska);
2871 pos = avio_tell(matroska->ctx->pb);
2872 matroska->prev_pkt = NULL;
2873 if (matroska->current_id)
2874 pos -= 4; /* sizeof the ID which was already read */
2875 res = ebml_parse(matroska, matroska_clusters, &cluster);
2876 blocks_list = &cluster.blocks;
2877 blocks = blocks_list->elem;
2878 for (i = 0; i < blocks_list->nb_elem; i++)
2879 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2880 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2881 res = matroska_parse_block(matroska, blocks[i].bin.data,
2882 blocks[i].bin.size, blocks[i].bin.pos,
2883 cluster.timecode, blocks[i].duration,
2884 is_keyframe, NULL, 0, 0, pos,
2885 blocks[i].discard_padding);
2886 }
2887 ebml_free(matroska_cluster, &cluster);
2888 return res;
2889}
2890
2891static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2892{
2893 MatroskaDemuxContext *matroska = s->priv_data;
2894
2895 while (matroska_deliver_packet(matroska, pkt)) {
2896 int64_t pos = avio_tell(matroska->ctx->pb);
2897 if (matroska->done)
2898 return AVERROR_EOF;
2899 if (matroska_parse_cluster(matroska) < 0)
2900 matroska_resync(matroska, pos);
2901 }
2902
2903 return 0;
2904}
2905
2906static int matroska_read_seek(AVFormatContext *s, int stream_index,
2907 int64_t timestamp, int flags)
2908{
2909 MatroskaDemuxContext *matroska = s->priv_data;
2910 MatroskaTrack *tracks = matroska->tracks.elem;
2911 AVStream *st = s->streams[stream_index];
2912 int i, index, index_sub, index_min;
2913
2914 /* Parse the CUES now since we need the index data to seek. */
2915 if (matroska->cues_parsing_deferred > 0) {
2916 matroska->cues_parsing_deferred = 0;
2917 matroska_parse_cues(matroska);
2918 }
2919
2920 if (!st->nb_index_entries)
2921 goto err;
2922 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
2923
2924 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2925 avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
2926 SEEK_SET);
2927 matroska->current_id = 0;
2928 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2929 matroska_clear_queue(matroska);
2930 if (matroska_parse_cluster(matroska) < 0)
2931 break;
2932 }
2933 }
2934
2935 matroska_clear_queue(matroska);
2936 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
2937 goto err;
2938
2939 index_min = index;
2940 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2941 tracks[i].audio.pkt_cnt = 0;
2942 tracks[i].audio.sub_packet_cnt = 0;
2943 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2944 tracks[i].end_timecode = 0;
2945 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
2946 tracks[i].stream->discard != AVDISCARD_ALL) {
2947 index_sub = av_index_search_timestamp(
2948 tracks[i].stream, st->index_entries[index].timestamp,
2949 AVSEEK_FLAG_BACKWARD);
2950 while (index_sub >= 0 &&
2951 index_min > 0 &&
2952 tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
2953 st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
2954 index_min--;
2955 }
2956 }
2957
2958 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2959 matroska->current_id = 0;
2960 if (flags & AVSEEK_FLAG_ANY) {
2961 st->skip_to_keyframe = 0;
2962 matroska->skip_to_timecode = timestamp;
2963 } else {
2964 st->skip_to_keyframe = 1;
2965 matroska->skip_to_timecode = st->index_entries[index].timestamp;
2966 }
2967 matroska->skip_to_keyframe = 1;
2968 matroska->done = 0;
2969 matroska->num_levels = 0;
2970 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2971 return 0;
2972err:
2973 // slightly hackish but allows proper fallback to
2974 // the generic seeking code.
2975 matroska_clear_queue(matroska);
2976 matroska->current_id = 0;
2977 st->skip_to_keyframe =
2978 matroska->skip_to_keyframe = 0;
2979 matroska->done = 0;
2980 matroska->num_levels = 0;
2981 return -1;
2982}
2983
2984static int matroska_read_close(AVFormatContext *s)
2985{
2986 MatroskaDemuxContext *matroska = s->priv_data;
2987 MatroskaTrack *tracks = matroska->tracks.elem;
2988 int n;
2989
2990 matroska_clear_queue(matroska);
2991
2992 for (n = 0; n < matroska->tracks.nb_elem; n++)
2993 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
2994 av_free(tracks[n].audio.buf);
2995 ebml_free(matroska_cluster, &matroska->current_cluster);
2996 ebml_free(matroska_segment, matroska);
2997
2998 return 0;
2999}
3000
3001typedef struct {
3002 int64_t start_time_ns;
3003 int64_t end_time_ns;
3004 int64_t start_offset;
3005 int64_t end_offset;
3006} CueDesc;
3007
3008/* This function searches all the Cues and returns the CueDesc corresponding the
3009 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3010 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3011 */
3012static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3013 MatroskaDemuxContext *matroska = s->priv_data;
3014 CueDesc cue_desc;
3015 int i;
3016 int nb_index_entries = s->streams[0]->nb_index_entries;
3017 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3018 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3019 for (i = 1; i < nb_index_entries; i++) {
3020 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3021 index_entries[i].timestamp * matroska->time_scale > ts) {
3022 break;
3023 }
3024 }
3025 --i;
3026 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3027 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3028 if (i != nb_index_entries - 1) {
3029 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3030 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3031 } else {
3032 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3033 // FIXME: this needs special handling for files where Cues appear
3034 // before Clusters. the current logic assumes Cues appear after
3035 // Clusters.
3036 cue_desc.end_offset = cues_start - matroska->segment_start;
3037 }
3038 return cue_desc;
3039}
3040
3041static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3042{
3043 MatroskaDemuxContext *matroska = s->priv_data;
3044 int64_t cluster_pos, before_pos;
3045 int index, rv = 1;
3046 if (s->streams[0]->nb_index_entries <= 0) return 0;
3047 // seek to the first cluster using cues.
3048 index = av_index_search_timestamp(s->streams[0], 0, 0);
3049 if (index < 0) return 0;
3050 cluster_pos = s->streams[0]->index_entries[index].pos;
3051 before_pos = avio_tell(s->pb);
3052 while (1) {
3053 int64_t cluster_id = 0, cluster_length = 0;
3054 AVPacket *pkt;
3055 avio_seek(s->pb, cluster_pos, SEEK_SET);
3056 // read cluster id and length
3057 ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
3058 ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3059 if (cluster_id != 0xF43B675) { // done with all clusters
3060 break;
3061 }
3062 avio_seek(s->pb, cluster_pos, SEEK_SET);
3063 matroska->current_id = 0;
3064 matroska_clear_queue(matroska);
3065 if (matroska_parse_cluster(matroska) < 0 ||
3066 matroska->num_packets <= 0) {
3067 break;
3068 }
3069 pkt = matroska->packets[0];
3070 cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
3071 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3072 rv = 0;
3073 break;
3074 }
3075 }
3076 avio_seek(s->pb, before_pos, SEEK_SET);
3077 return rv;
3078}
3079
3080static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3081 double min_buffer, double* buffer,
3082 double* sec_to_download, AVFormatContext *s,
3083 int64_t cues_start)
3084{
3085 double nano_seconds_per_second = 1000000000.0;
3086 double time_sec = time_ns / nano_seconds_per_second;
3087 int rv = 0;
3088 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3089 int64_t end_time_ns = time_ns + time_to_search_ns;
3090 double sec_downloaded = 0.0;
3091 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3092 if (desc_curr.start_time_ns == -1)
3093 return -1;
3094 *sec_to_download = 0.0;
3095
3096 // Check for non cue start time.
3097 if (time_ns > desc_curr.start_time_ns) {
3098 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3099 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3100 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3101 double timeToDownload = (cueBytes * 8.0) / bps;
3102
3103 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3104 *sec_to_download += timeToDownload;
3105
3106 // Check if the search ends within the first cue.
3107 if (desc_curr.end_time_ns >= end_time_ns) {
3108 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3109 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3110 sec_downloaded = percent_to_sub * sec_downloaded;
3111 *sec_to_download = percent_to_sub * *sec_to_download;
3112 }
3113
3114 if ((sec_downloaded + *buffer) <= min_buffer) {
3115 return 1;
3116 }
3117
3118 // Get the next Cue.
3119 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3120 }
3121
3122 while (desc_curr.start_time_ns != -1) {
3123 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3124 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3125 double desc_sec = desc_ns / nano_seconds_per_second;
3126 double bits = (desc_bytes * 8.0);
3127 double time_to_download = bits / bps;
3128
3129 sec_downloaded += desc_sec - time_to_download;
3130 *sec_to_download += time_to_download;
3131
3132 if (desc_curr.end_time_ns >= end_time_ns) {
3133 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3134 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3135 sec_downloaded = percent_to_sub * sec_downloaded;
3136 *sec_to_download = percent_to_sub * *sec_to_download;
3137
3138 if ((sec_downloaded + *buffer) <= min_buffer)
3139 rv = 1;
3140 break;
3141 }
3142
3143 if ((sec_downloaded + *buffer) <= min_buffer) {
3144 rv = 1;
3145 break;
3146 }
3147
3148 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3149 }
3150 *buffer = *buffer + sec_downloaded;
3151 return rv;
3152}
3153
3154/* This function computes the bandwidth of the WebM file with the help of
3155 * buffer_size_after_time_downloaded() function. Both of these functions are
3156 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3157 * Matroska parsing mechanism.
3158 *
3159 * Returns the bandwidth of the file on success; -1 on error.
3160 * */
3161static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3162{
3163 MatroskaDemuxContext *matroska = s->priv_data;
3164 AVStream *st = s->streams[0];
3165 double bandwidth = 0.0;
3166 int i;
3167
3168 for (i = 0; i < st->nb_index_entries; i++) {
3169 int64_t prebuffer_ns = 1000000000;
3170 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3171 double nano_seconds_per_second = 1000000000.0;
3172 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3173 double prebuffer_bytes = 0.0;
3174 int64_t temp_prebuffer_ns = prebuffer_ns;
3175 int64_t pre_bytes, pre_ns;
3176 double pre_sec, prebuffer, bits_per_second;
3177 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3178
3179 // Start with the first Cue.
3180 CueDesc desc_end = desc_beg;
3181
3182 // Figure out how much data we have downloaded for the prebuffer. This will
3183 // be used later to adjust the bits per sample to try.
3184 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3185 // Prebuffered the entire Cue.
3186 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3187 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3188 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3189 }
3190 if (desc_end.start_time_ns == -1) {
3191 // The prebuffer is larger than the duration.
3192 return (matroska->duration * matroska->time_scale >= prebuffered_ns) ? -1 : 0;
3193 }
3194
3195 // The prebuffer ends in the last Cue. Estimate how much data was
3196 // prebuffered.
3197 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3198 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3199 pre_sec = pre_ns / nano_seconds_per_second;
3200 prebuffer_bytes +=
3201 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3202
3203 prebuffer = prebuffer_ns / nano_seconds_per_second;
3204
3205 // Set this to 0.0 in case our prebuffer buffers the entire video.
3206 bits_per_second = 0.0;
3207 do {
3208 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3209 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3210 double desc_sec = desc_ns / nano_seconds_per_second;
3211 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3212
3213 // Drop the bps by the percentage of bytes buffered.
3214 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3215 double mod_bits_per_second = calc_bits_per_second * percent;
3216
3217 if (prebuffer < desc_sec) {
3218 double search_sec =
3219 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3220
3221 // Add 1 so the bits per second should be a little bit greater than file
3222 // datarate.
3223 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3224 const double min_buffer = 0.0;
3225 double buffer = prebuffer;
3226 double sec_to_download = 0.0;
3227
3228 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3229 min_buffer, &buffer, &sec_to_download,
3230 s, cues_start);
3231 if (rv < 0) {
3232 return -1;
3233 } else if (rv == 0) {
3234 bits_per_second = (double)(bps);
3235 break;
3236 }
3237 }
3238
3239 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3240 } while (desc_end.start_time_ns != -1);
3241 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3242 }
3243 return (int64_t)bandwidth;
3244}
3245
3246static int webm_dash_manifest_cues(AVFormatContext *s)
3247{
3248 MatroskaDemuxContext *matroska = s->priv_data;
3249 EbmlList *seekhead_list = &matroska->seekhead;
3250 MatroskaSeekhead *seekhead = seekhead_list->elem;
3251 char *buf;
3252 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3253 int i;
3254
3255 // determine cues start and end positions
3256 for (i = 0; i < seekhead_list->nb_elem; i++)
3257 if (seekhead[i].id == MATROSKA_ID_CUES)
3258 break;
3259
3260 if (i >= seekhead_list->nb_elem) return -1;
3261
3262 before_pos = avio_tell(matroska->ctx->pb);
3263 cues_start = seekhead[i].pos + matroska->segment_start;
3264 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
3265 uint64_t cues_length = 0, cues_id = 0;
3266 ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
3267 ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
3268 cues_end = cues_start + cues_length + 11; // 11 is the offset of Cues ID.
3269 }
3270 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3271 if (cues_start == -1 || cues_end == -1) return -1;
3272
3273 // parse the cues
3274 matroska_parse_cues(matroska);
3275
3276 // cues start
3277 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
3278
3279 // cues end
3280 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
3281
3282 // bandwidth
3283 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
3284 if (bandwidth < 0) return -1;
3285 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
3286
3287 // check if all clusters start with key frames
3288 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
3289
3290 // store cue point timestamps as a comma separated list for checking subsegment alignment in
3291 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3292 buf = av_malloc(s->streams[0]->nb_index_entries * 20 * sizeof(char));
3293 if (!buf) return -1;
3294 strcpy(buf, "");
3295 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
3296 snprintf(buf, (i + 1) * 20 * sizeof(char),
3297 "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
3298 if (i != s->streams[0]->nb_index_entries - 1)
3299 strncat(buf, ",", sizeof(char));
3300 }
3301 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
3302 av_free(buf);
3303
3304 return 0;
3305}
3306
3307static int webm_dash_manifest_read_header(AVFormatContext *s)
3308{
3309 char *buf;
3310 int ret = matroska_read_header(s);
3311 MatroskaTrack *tracks;
3312 MatroskaDemuxContext *matroska = s->priv_data;
3313 if (ret) {
3314 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
3315 return -1;
3316 }
3317
3318 // initialization range
3319 // 5 is the offset of Cluster ID.
3320 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, avio_tell(s->pb) - 5, 0);
3321
3322 // basename of the file
3323 buf = strrchr(s->filename, '/');
3324 if (!buf) return -1;
3325 av_dict_set(&s->streams[0]->metadata, FILENAME, ++buf, 0);
3326
3327 // duration
3328 buf = av_asprintf("%g", matroska->duration);
3329 if (!buf) return AVERROR(ENOMEM);
3330 av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
3331 av_free(buf);
3332
3333 // track number
3334 tracks = matroska->tracks.elem;
3335 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
3336
3337 // parse the cues and populate Cue related fields
3338 return webm_dash_manifest_cues(s);
3339}
3340
3341static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
3342{
3343 return AVERROR_EOF;
3344}
3345
3346AVInputFormat ff_matroska_demuxer = {
3347 .name = "matroska,webm",
3348 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3349 .extensions = "mkv,mk3d,mka,mks",
3350 .priv_data_size = sizeof(MatroskaDemuxContext),
3351 .read_probe = matroska_probe,
3352 .read_header = matroska_read_header,
3353 .read_packet = matroska_read_packet,
3354 .read_close = matroska_read_close,
3355 .read_seek = matroska_read_seek,
3356 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3357};
3358
3359AVInputFormat ff_webm_dash_manifest_demuxer = {
3360 .name = "webm_dash_manifest",
3361 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
3362 .priv_data_size = sizeof(MatroskaDemuxContext),
3363 .read_header = webm_dash_manifest_read_header,
3364 .read_packet = webm_dash_manifest_read_packet,
3365 .read_close = matroska_read_close,
3366};
ffmpeg Piment Noir Debian package repository