matroskadec.c
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1 /*
2  * Matroska file demuxer
3  * Copyright (c) 2003-2008 The Libav Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
31 #include <stdio.h>
32 #include "avformat.h"
33 #include "internal.h"
34 #include "avio_internal.h"
35 /* For ff_codec_get_id(). */
36 #include "riff.h"
37 #include "isom.h"
38 #include "rmsipr.h"
39 #include "matroska.h"
40 #include "libavcodec/bytestream.h"
41 #include "libavcodec/mpeg4audio.h"
42 #include "libavutil/intfloat.h"
43 #include "libavutil/intreadwrite.h"
44 #include "libavutil/avstring.h"
45 #include "libavutil/lzo.h"
46 #include "libavutil/dict.h"
47 #if CONFIG_ZLIB
48 #include <zlib.h>
49 #endif
50 #if CONFIG_BZLIB
51 #include <bzlib.h>
52 #endif
53 
54 typedef enum {
55  EBML_NONE,
56  EBML_UINT,
57  EBML_FLOAT,
58  EBML_STR,
59  EBML_UTF8,
60  EBML_BIN,
61  EBML_NEST,
62  EBML_PASS,
63  EBML_STOP,
64  EBML_TYPE_COUNT
65 } EbmlType;
66 
67 typedef const struct EbmlSyntax {
68  uint32_t id;
69  EbmlType type;
70  int list_elem_size;
71  int data_offset;
72  union {
73  uint64_t u;
74  double f;
75  const char *s;
76  const struct EbmlSyntax *n;
77  } def;
78 } EbmlSyntax;
79 
80 typedef struct {
81  int nb_elem;
82  void *elem;
83 } EbmlList;
84 
85 typedef struct {
86  int size;
87  uint8_t *data;
88  int64_t pos;
89 } EbmlBin;
90 
91 typedef struct {
92  uint64_t version;
93  uint64_t max_size;
94  uint64_t id_length;
95  char *doctype;
96  uint64_t doctype_version;
97 } Ebml;
98 
99 typedef struct {
100  uint64_t algo;
101  EbmlBin settings;
102 } MatroskaTrackCompression;
103 
104 typedef struct {
105  uint64_t scope;
106  uint64_t type;
107  MatroskaTrackCompression compression;
108 } MatroskaTrackEncoding;
109 
110 typedef struct {
111  double frame_rate;
112  uint64_t display_width;
113  uint64_t display_height;
114  uint64_t pixel_width;
115  uint64_t pixel_height;
116  uint64_t fourcc;
117 } MatroskaTrackVideo;
118 
119 typedef struct {
120  double samplerate;
121  double out_samplerate;
122  uint64_t bitdepth;
123  uint64_t channels;
124 
125  /* real audio header (extracted from extradata) */
126  int coded_framesize;
127  int sub_packet_h;
128  int frame_size;
129  int sub_packet_size;
130  int sub_packet_cnt;
131  int pkt_cnt;
132  uint64_t buf_timecode;
133  uint8_t *buf;
134 } MatroskaTrackAudio;
135 
136 typedef struct {
137  uint64_t num;
138  uint64_t uid;
139  uint64_t type;
140  char *name;
141  char *codec_id;
142  EbmlBin codec_priv;
143  char *language;
144  double time_scale;
145  uint64_t default_duration;
146  uint64_t flag_default;
147  uint64_t flag_forced;
148  MatroskaTrackVideo video;
149  MatroskaTrackAudio audio;
150  EbmlList encodings;
151 
152  AVStream *stream;
153  int64_t end_timecode;
154  int ms_compat;
155 } MatroskaTrack;
156 
157 typedef struct {
158  uint64_t uid;
159  char *filename;
160  char *mime;
161  EbmlBin bin;
162 
163  AVStream *stream;
164 } MatroskaAttachement;
165 
166 typedef struct {
167  uint64_t start;
168  uint64_t end;
169  uint64_t uid;
170  char *title;
171 
172  AVChapter *chapter;
173 } MatroskaChapter;
174 
175 typedef struct {
176  uint64_t track;
177  uint64_t pos;
178 } MatroskaIndexPos;
179 
180 typedef struct {
181  uint64_t time;
182  EbmlList pos;
183 } MatroskaIndex;
184 
185 typedef struct {
186  char *name;
187  char *string;
188  char *lang;
189  uint64_t def;
190  EbmlList sub;
191 } MatroskaTag;
192 
193 typedef struct {
194  char *type;
195  uint64_t typevalue;
196  uint64_t trackuid;
197  uint64_t chapteruid;
198  uint64_t attachuid;
199 } MatroskaTagTarget;
200 
201 typedef struct {
202  MatroskaTagTarget target;
203  EbmlList tag;
204 } MatroskaTags;
205 
206 typedef struct {
207  uint64_t id;
208  uint64_t pos;
209 } MatroskaSeekhead;
210 
211 typedef struct {
212  uint64_t start;
213  uint64_t length;
214 } MatroskaLevel;
215 
216 typedef struct {
217  uint64_t timecode;
218  EbmlList blocks;
219 } MatroskaCluster;
220 
221 typedef struct {
222  AVFormatContext *ctx;
223 
224  /* EBML stuff */
225  int num_levels;
226  MatroskaLevel levels[EBML_MAX_DEPTH];
227  int level_up;
228  uint32_t current_id;
229 
230  uint64_t time_scale;
231  double duration;
232  char *title;
233  EbmlList tracks;
234  EbmlList attachments;
235  EbmlList chapters;
236  EbmlList index;
237  EbmlList tags;
238  EbmlList seekhead;
239 
240  /* byte position of the segment inside the stream */
241  int64_t segment_start;
242 
243  /* the packet queue */
244  AVPacket **packets;
245  int num_packets;
246  AVPacket *prev_pkt;
247 
248  int done;
249 
250  /* What to skip before effectively reading a packet. */
251  int skip_to_keyframe;
252  uint64_t skip_to_timecode;
253 
254  /* File has a CUES element, but we defer parsing until it is needed. */
255  int cues_parsing_deferred;
256 
257  int current_cluster_num_blocks;
258  int64_t current_cluster_pos;
259  MatroskaCluster current_cluster;
260 
261  /* File has SSA subtitles which prevent incremental cluster parsing. */
262  int contains_ssa;
263 } MatroskaDemuxContext;
264 
265 typedef struct {
266  uint64_t duration;
267  int64_t reference;
268  uint64_t non_simple;
269  EbmlBin bin;
270 } MatroskaBlock;
271 
272 static EbmlSyntax ebml_header[] = {
273  { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
274  { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
275  { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
276  { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
277  { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
278  { EBML_ID_EBMLVERSION, EBML_NONE },
279  { EBML_ID_DOCTYPEVERSION, EBML_NONE },
280  { 0 }
281 };
282 
283 static EbmlSyntax ebml_syntax[] = {
284  { EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
285  { 0 }
286 };
287 
288 static EbmlSyntax matroska_info[] = {
289  { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
290  { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
291  { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
292  { MATROSKA_ID_WRITINGAPP, EBML_NONE },
293  { MATROSKA_ID_MUXINGAPP, EBML_NONE },
294  { MATROSKA_ID_DATEUTC, EBML_NONE },
295  { MATROSKA_ID_SEGMENTUID, EBML_NONE },
296  { 0 }
297 };
298 
299 static EbmlSyntax matroska_track_video[] = {
300  { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
301  { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
302  { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
303  { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
304  { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
305  { MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
306  { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
307  { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
308  { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
309  { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
310  { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
311  { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
312  { MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
313  { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
314  { 0 }
315 };
316 
317 static EbmlSyntax matroska_track_audio[] = {
318  { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
319  { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
320  { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
321  { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
322  { 0 }
323 };
324 
325 static EbmlSyntax matroska_track_encoding_compression[] = {
326  { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
327  { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
328  { 0 }
329 };
330 
331 static EbmlSyntax matroska_track_encoding[] = {
332  { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
333  { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
334  { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
335  { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
336  { 0 }
337 };
338 
339 static EbmlSyntax matroska_track_encodings[] = {
340  { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
341  { 0 }
342 };
343 
344 static EbmlSyntax matroska_track[] = {
345  { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
346  { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
347  { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
348  { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
349  { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
350  { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
351  { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
352  { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
353  { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
354  { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
355  { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
356  { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
357  { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
358  { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
359  { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
360  { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
361  { MATROSKA_ID_CODECNAME, EBML_NONE },
362  { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
363  { MATROSKA_ID_CODECINFOURL, EBML_NONE },
364  { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
365  { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
366  { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
367  { MATROSKA_ID_TRACKMAXBLKADDID, EBML_NONE },
368  { 0 }
369 };
370 
371 static EbmlSyntax matroska_tracks[] = {
372  { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
373  { 0 }
374 };
375 
376 static EbmlSyntax matroska_attachment[] = {
377  { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
378  { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
379  { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
380  { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
381  { MATROSKA_ID_FILEDESC, EBML_NONE },
382  { 0 }
383 };
384 
385 static EbmlSyntax matroska_attachments[] = {
386  { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
387  { 0 }
388 };
389 
390 static EbmlSyntax matroska_chapter_display[] = {
391  { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
392  { MATROSKA_ID_CHAPLANG, EBML_NONE },
393  { 0 }
394 };
395 
396 static EbmlSyntax matroska_chapter_entry[] = {
397  { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
398  { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
399  { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
400  { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
401  { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
402  { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
403  { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
404  { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
405  { 0 }
406 };
407 
408 static EbmlSyntax matroska_chapter[] = {
409  { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
410  { MATROSKA_ID_EDITIONUID, EBML_NONE },
411  { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
412  { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
413  { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
414  { 0 }
415 };
416 
417 static EbmlSyntax matroska_chapters[] = {
418  { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
419  { 0 }
420 };
421 
422 static EbmlSyntax matroska_index_pos[] = {
423  { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
424  { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
425  { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
426  { 0 }
427 };
428 
429 static EbmlSyntax matroska_index_entry[] = {
430  { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
431  { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
432  { 0 }
433 };
434 
435 static EbmlSyntax matroska_index[] = {
436  { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
437  { 0 }
438 };
439 
440 static EbmlSyntax matroska_simpletag[] = {
441  { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag,name) },
442  { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag,string) },
443  { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag,lang), {.s="und"} },
444  { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag,def) },
445  { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag,def) },
446  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
447  { 0 }
448 };
449 
450 static EbmlSyntax matroska_tagtargets[] = {
451  { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget,type) },
452  { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
453  { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
454  { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
455  { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
456  { 0 }
457 };
458 
459 static EbmlSyntax matroska_tag[] = {
460  { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
461  { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
462  { 0 }
463 };
464 
465 static EbmlSyntax matroska_tags[] = {
466  { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
467  { 0 }
468 };
469 
470 static EbmlSyntax matroska_seekhead_entry[] = {
471  { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
472  { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
473  { 0 }
474 };
475 
476 static EbmlSyntax matroska_seekhead[] = {
477  { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
478  { 0 }
479 };
480 
481 static EbmlSyntax matroska_segment[] = {
482  { MATROSKA_ID_INFO, EBML_NEST, 0, 0, {.n=matroska_info } },
483  { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, {.n=matroska_tracks } },
484  { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, {.n=matroska_attachments} },
485  { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, {.n=matroska_chapters } },
486  { MATROSKA_ID_CUES, EBML_NEST, 0, 0, {.n=matroska_index } },
487  { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, {.n=matroska_tags } },
488  { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, {.n=matroska_seekhead } },
489  { MATROSKA_ID_CLUSTER, EBML_STOP },
490  { 0 }
491 };
492 
493 static EbmlSyntax matroska_segments[] = {
494  { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, {.n=matroska_segment } },
495  { 0 }
496 };
497 
498 static EbmlSyntax matroska_blockgroup[] = {
499  { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
500  { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
501  { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
502  { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
503  { 1, EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
504  { 0 }
505 };
506 
507 static EbmlSyntax matroska_cluster[] = {
508  { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
509  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
510  { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
511  { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
512  { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
513  { 0 }
514 };
515 
516 static EbmlSyntax matroska_clusters[] = {
517  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster} },
518  { MATROSKA_ID_INFO, EBML_NONE },
519  { MATROSKA_ID_CUES, EBML_NONE },
520  { MATROSKA_ID_TAGS, EBML_NONE },
521  { MATROSKA_ID_SEEKHEAD, EBML_NONE },
522  { 0 }
523 };
524 
525 static EbmlSyntax matroska_cluster_incremental_parsing[] = {
526  { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
527  { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
528  { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
529  { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
530  { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
531  { MATROSKA_ID_INFO, EBML_NONE },
532  { MATROSKA_ID_CUES, EBML_NONE },
533  { MATROSKA_ID_TAGS, EBML_NONE },
534  { MATROSKA_ID_SEEKHEAD, EBML_NONE },
535  { MATROSKA_ID_CLUSTER, EBML_STOP },
536  { 0 }
537 };
538 
539 static EbmlSyntax matroska_cluster_incremental[] = {
540  { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
541  { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
542  { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
543  { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
544  { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
545  { 0 }
546 };
547 
548 static EbmlSyntax matroska_clusters_incremental[] = {
549  { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster_incremental} },
550  { MATROSKA_ID_INFO, EBML_NONE },
551  { MATROSKA_ID_CUES, EBML_NONE },
552  { MATROSKA_ID_TAGS, EBML_NONE },
553  { MATROSKA_ID_SEEKHEAD, EBML_NONE },
554  { 0 }
555 };
556 
557 static const char *const matroska_doctypes[] = { "matroska", "webm" };
558 
559 /*
560  * Return: Whether we reached the end of a level in the hierarchy or not.
561  */
562 static int ebml_level_end(MatroskaDemuxContext *matroska)
563 {
564  AVIOContext *pb = matroska->ctx->pb;
565  int64_t pos = avio_tell(pb);
566 
567  if (matroska->num_levels > 0) {
568  MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
569  if (pos - level->start >= level->length || matroska->current_id) {
570  matroska->num_levels--;
571  return 1;
572  }
573  }
574  return 0;
575 }
576 
577 /*
578  * Read: an "EBML number", which is defined as a variable-length
579  * array of bytes. The first byte indicates the length by giving a
580  * number of 0-bits followed by a one. The position of the first
581  * "one" bit inside the first byte indicates the length of this
582  * number.
583  * Returns: number of bytes read, < 0 on error
584  */
585 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
586  int max_size, uint64_t *number)
587 {
588  int read = 1, n = 1;
589  uint64_t total = 0;
590 
591  /* The first byte tells us the length in bytes - avio_r8() can normally
592  * return 0, but since that's not a valid first ebmlID byte, we can
593  * use it safely here to catch EOS. */
594  if (!(total = avio_r8(pb))) {
595  /* we might encounter EOS here */
596  if (!pb->eof_reached) {
597  int64_t pos = avio_tell(pb);
598  av_log(matroska->ctx, AV_LOG_ERROR,
599  "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
600  pos, pos);
601  return pb->error ? pb->error : AVERROR(EIO);
602  }
603  return AVERROR_EOF;
604  }
605 
606  /* get the length of the EBML number */
607  read = 8 - ff_log2_tab[total];
608  if (read > max_size) {
609  int64_t pos = avio_tell(pb) - 1;
610  av_log(matroska->ctx, AV_LOG_ERROR,
611  "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
612  (uint8_t) total, pos, pos);
613  return AVERROR_INVALIDDATA;
614  }
615 
616  /* read out length */
617  total ^= 1 << ff_log2_tab[total];
618  while (n++ < read)
619  total = (total << 8) | avio_r8(pb);
620 
621  *number = total;
622 
623  return read;
624 }
625 
631 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
632  uint64_t *number)
633 {
634  int res = ebml_read_num(matroska, pb, 8, number);
635  if (res > 0 && *number + 1 == 1ULL << (7 * res))
636  *number = 0xffffffffffffffULL;
637  return res;
638 }
639 
640 /*
641  * Read the next element as an unsigned int.
642  * 0 is success, < 0 is failure.
643  */
644 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
645 {
646  int n = 0;
647 
648  if (size > 8)
649  return AVERROR_INVALIDDATA;
650 
651  /* big-endian ordering; build up number */
652  *num = 0;
653  while (n++ < size)
654  *num = (*num << 8) | avio_r8(pb);
655 
656  return 0;
657 }
658 
659 /*
660  * Read the next element as a float.
661  * 0 is success, < 0 is failure.
662  */
663 static int ebml_read_float(AVIOContext *pb, int size, double *num)
664 {
665  if (size == 0) {
666  *num = 0;
667  } else if (size == 4) {
668  *num = av_int2float(avio_rb32(pb));
669  } else if (size == 8){
670  *num = av_int2double(avio_rb64(pb));
671  } else
672  return AVERROR_INVALIDDATA;
673 
674  return 0;
675 }
676 
677 /*
678  * Read the next element as an ASCII string.
679  * 0 is success, < 0 is failure.
680  */
681 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
682 {
683  char *res;
684 
685  /* EBML strings are usually not 0-terminated, so we allocate one
686  * byte more, read the string and NULL-terminate it ourselves. */
687  if (!(res = av_malloc(size + 1)))
688  return AVERROR(ENOMEM);
689  if (avio_read(pb, (uint8_t *) res, size) != size) {
690  av_free(res);
691  return AVERROR(EIO);
692  }
693  (res)[size] = '\0';
694  av_free(*str);
695  *str = res;
696 
697  return 0;
698 }
699 
700 /*
701  * Read the next element as binary data.
702  * 0 is success, < 0 is failure.
703  */
704 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
705 {
706  av_free(bin->data);
707  if (!(bin->data = av_malloc(length)))
708  return AVERROR(ENOMEM);
709 
710  bin->size = length;
711  bin->pos = avio_tell(pb);
712  if (avio_read(pb, bin->data, length) != length) {
713  av_freep(&bin->data);
714  return AVERROR(EIO);
715  }
716 
717  return 0;
718 }
719 
720 /*
721  * Read the next element, but only the header. The contents
722  * are supposed to be sub-elements which can be read separately.
723  * 0 is success, < 0 is failure.
724  */
725 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
726 {
727  AVIOContext *pb = matroska->ctx->pb;
728  MatroskaLevel *level;
729 
730  if (matroska->num_levels >= EBML_MAX_DEPTH) {
731  av_log(matroska->ctx, AV_LOG_ERROR,
732  "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
733  return AVERROR(ENOSYS);
734  }
735 
736  level = &matroska->levels[matroska->num_levels++];
737  level->start = avio_tell(pb);
738  level->length = length;
739 
740  return 0;
741 }
742 
743 /*
744  * Read signed/unsigned "EBML" numbers.
745  * Return: number of bytes processed, < 0 on error
746  */
747 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
748  uint8_t *data, uint32_t size, uint64_t *num)
749 {
750  AVIOContext pb;
751  ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
752  return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
753 }
754 
755 /*
756  * Same as above, but signed.
757  */
758 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
759  uint8_t *data, uint32_t size, int64_t *num)
760 {
761  uint64_t unum;
762  int res;
763 
764  /* read as unsigned number first */
765  if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
766  return res;
767 
768  /* make signed (weird way) */
769  *num = unum - ((1LL << (7*res - 1)) - 1);
770 
771  return res;
772 }
773 
774 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
775  EbmlSyntax *syntax, void *data);
776 
777 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
778  uint32_t id, void *data)
779 {
780  int i;
781  for (i=0; syntax[i].id; i++)
782  if (id == syntax[i].id)
783  break;
784  if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
785  matroska->num_levels > 0 &&
786  matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
787  return 0; // we reached the end of an unknown size cluster
788  if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
789  av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
790  if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
791  return AVERROR_INVALIDDATA;
792  }
793  return ebml_parse_elem(matroska, &syntax[i], data);
794 }
795 
796 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
797  void *data)
798 {
799  if (!matroska->current_id) {
800  uint64_t id;
801  int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
802  if (res < 0)
803  return res;
804  matroska->current_id = id | 1 << 7*res;
805  }
806  return ebml_parse_id(matroska, syntax, matroska->current_id, data);
807 }
808 
809 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
810  void *data)
811 {
812  int i, res = 0;
813 
814  for (i=0; syntax[i].id; i++)
815  switch (syntax[i].type) {
816  case EBML_UINT:
817  *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
818  break;
819  case EBML_FLOAT:
820  *(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
821  break;
822  case EBML_STR:
823  case EBML_UTF8:
824  *(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
825  break;
826  }
827 
828  while (!res && !ebml_level_end(matroska))
829  res = ebml_parse(matroska, syntax, data);
830 
831  return res;
832 }
833 
834 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
835  EbmlSyntax *syntax, void *data)
836 {
837  static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
838  [EBML_UINT] = 8,
839  [EBML_FLOAT] = 8,
840  // max. 16 MB for strings
841  [EBML_STR] = 0x1000000,
842  [EBML_UTF8] = 0x1000000,
843  // max. 256 MB for binary data
844  [EBML_BIN] = 0x10000000,
845  // no limits for anything else
846  };
847  AVIOContext *pb = matroska->ctx->pb;
848  uint32_t id = syntax->id;
849  uint64_t length;
850  int res;
851  void *newelem;
852 
853  data = (char *)data + syntax->data_offset;
854  if (syntax->list_elem_size) {
855  EbmlList *list = data;
856  newelem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
857  if (!newelem)
858  return AVERROR(ENOMEM);
859  list->elem = newelem;
860  data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
861  memset(data, 0, syntax->list_elem_size);
862  list->nb_elem++;
863  }
864 
865  if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
866  matroska->current_id = 0;
867  if ((res = ebml_read_length(matroska, pb, &length)) < 0)
868  return res;
869  if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
870  av_log(matroska->ctx, AV_LOG_ERROR,
871  "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
872  length, max_lengths[syntax->type], syntax->type);
873  return AVERROR_INVALIDDATA;
874  }
875  }
876 
877  switch (syntax->type) {
878  case EBML_UINT: res = ebml_read_uint (pb, length, data); break;
879  case EBML_FLOAT: res = ebml_read_float (pb, length, data); break;
880  case EBML_STR:
881  case EBML_UTF8: res = ebml_read_ascii (pb, length, data); break;
882  case EBML_BIN: res = ebml_read_binary(pb, length, data); break;
883  case EBML_NEST: if ((res=ebml_read_master(matroska, length)) < 0)
884  return res;
885  if (id == MATROSKA_ID_SEGMENT)
886  matroska->segment_start = avio_tell(matroska->ctx->pb);
887  return ebml_parse_nest(matroska, syntax->def.n, data);
888  case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data);
889  case EBML_STOP: return 1;
890  default: return avio_skip(pb,length)<0 ? AVERROR(EIO) : 0;
891  }
892  if (res == AVERROR_INVALIDDATA)
893  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
894  else if (res == AVERROR(EIO))
895  av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
896  return res;
897 }
898 
899 static void ebml_free(EbmlSyntax *syntax, void *data)
900 {
901  int i, j;
902  for (i=0; syntax[i].id; i++) {
903  void *data_off = (char *)data + syntax[i].data_offset;
904  switch (syntax[i].type) {
905  case EBML_STR:
906  case EBML_UTF8: av_freep(data_off); break;
907  case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
908  case EBML_NEST:
909  if (syntax[i].list_elem_size) {
910  EbmlList *list = data_off;
911  char *ptr = list->elem;
912  for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
913  ebml_free(syntax[i].def.n, ptr);
914  av_free(list->elem);
915  } else
916  ebml_free(syntax[i].def.n, data_off);
917  default: break;
918  }
919  }
920 }
921 
922 
923 /*
924  * Autodetecting...
925  */
926 static int matroska_probe(AVProbeData *p)
927 {
928  uint64_t total = 0;
929  int len_mask = 0x80, size = 1, n = 1, i;
930 
931  /* EBML header? */
932  if (AV_RB32(p->buf) != EBML_ID_HEADER)
933  return 0;
934 
935  /* length of header */
936  total = p->buf[4];
937  while (size <= 8 && !(total & len_mask)) {
938  size++;
939  len_mask >>= 1;
940  }
941  if (size > 8)
942  return 0;
943  total &= (len_mask - 1);
944  while (n < size)
945  total = (total << 8) | p->buf[4 + n++];
946 
947  /* Does the probe data contain the whole header? */
948  if (p->buf_size < 4 + size + total)
949  return 0;
950 
951  /* The header should contain a known document type. For now,
952  * we don't parse the whole header but simply check for the
953  * availability of that array of characters inside the header.
954  * Not fully fool-proof, but good enough. */
955  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
956  int probelen = strlen(matroska_doctypes[i]);
957  if (total < probelen)
958  continue;
959  for (n = 4+size; n <= 4+size+total-probelen; n++)
960  if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
961  return AVPROBE_SCORE_MAX;
962  }
963 
964  // probably valid EBML header but no recognized doctype
965  return AVPROBE_SCORE_MAX/2;
966 }
967 
968 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
969  int num)
970 {
971  MatroskaTrack *tracks = matroska->tracks.elem;
972  int i;
973 
974  for (i=0; i < matroska->tracks.nb_elem; i++)
975  if (tracks[i].num == num)
976  return &tracks[i];
977 
978  av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
979  return NULL;
980 }
981 
982 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
983  MatroskaTrack *track)
984 {
985  MatroskaTrackEncoding *encodings = track->encodings.elem;
986  uint8_t* data = *buf;
987  int isize = *buf_size;
988  uint8_t* pkt_data = NULL;
989  uint8_t av_unused *newpktdata;
990  int pkt_size = isize;
991  int result = 0;
992  int olen;
993 
994  if (pkt_size >= 10000000)
995  return AVERROR_INVALIDDATA;
996 
997  switch (encodings[0].compression.algo) {
998  case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP: {
999  int header_size = encodings[0].compression.settings.size;
1000  uint8_t *header = encodings[0].compression.settings.data;
1001 
1002  if (!header_size)
1003  return 0;
1004 
1005  pkt_size = isize + header_size;
1006  pkt_data = av_malloc(pkt_size);
1007  if (!pkt_data)
1008  return AVERROR(ENOMEM);
1009 
1010  memcpy(pkt_data, header, header_size);
1011  memcpy(pkt_data + header_size, data, isize);
1012  break;
1013  }
1014 #if CONFIG_LZO
1015  case MATROSKA_TRACK_ENCODING_COMP_LZO:
1016  do {
1017  olen = pkt_size *= 3;
1018  newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
1019  if (!newpktdata) {
1020  result = AVERROR(ENOMEM);
1021  goto failed;
1022  }
1023  pkt_data = newpktdata;
1024  result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1025  } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
1026  if (result) {
1027  result = AVERROR_INVALIDDATA;
1028  goto failed;
1029  }
1030  pkt_size -= olen;
1031  break;
1032 #endif
1033 #if CONFIG_ZLIB
1034  case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
1035  z_stream zstream = {0};
1036  if (inflateInit(&zstream) != Z_OK)
1037  return -1;
1038  zstream.next_in = data;
1039  zstream.avail_in = isize;
1040  do {
1041  pkt_size *= 3;
1042  newpktdata = av_realloc(pkt_data, pkt_size);
1043  if (!newpktdata) {
1044  inflateEnd(&zstream);
1045  goto failed;
1046  }
1047  pkt_data = newpktdata;
1048  zstream.avail_out = pkt_size - zstream.total_out;
1049  zstream.next_out = pkt_data + zstream.total_out;
1050  result = inflate(&zstream, Z_NO_FLUSH);
1051  } while (result==Z_OK && pkt_size<10000000);
1052  pkt_size = zstream.total_out;
1053  inflateEnd(&zstream);
1054  if (result != Z_STREAM_END) {
1055  if (result == Z_MEM_ERROR)
1056  result = AVERROR(ENOMEM);
1057  else
1058  result = AVERROR_INVALIDDATA;
1059  goto failed;
1060  }
1061  break;
1062  }
1063 #endif
1064 #if CONFIG_BZLIB
1065  case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
1066  bz_stream bzstream = {0};
1067  if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1068  return -1;
1069  bzstream.next_in = data;
1070  bzstream.avail_in = isize;
1071  do {
1072  pkt_size *= 3;
1073  newpktdata = av_realloc(pkt_data, pkt_size);
1074  if (!newpktdata) {
1075  BZ2_bzDecompressEnd(&bzstream);
1076  goto failed;
1077  }
1078  pkt_data = newpktdata;
1079  bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1080  bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1081  result = BZ2_bzDecompress(&bzstream);
1082  } while (result==BZ_OK && pkt_size<10000000);
1083  pkt_size = bzstream.total_out_lo32;
1084  BZ2_bzDecompressEnd(&bzstream);
1085  if (result != BZ_STREAM_END) {
1086  if (result == BZ_MEM_ERROR)
1087  result = AVERROR(ENOMEM);
1088  else
1089  result = AVERROR_INVALIDDATA;
1090  goto failed;
1091  }
1092  break;
1093  }
1094 #endif
1095  default:
1096  return AVERROR_INVALIDDATA;
1097  }
1098 
1099  *buf = pkt_data;
1100  *buf_size = pkt_size;
1101  return 0;
1102  failed:
1103  av_free(pkt_data);
1104  return result;
1105 }
1106 
1107 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1108  AVPacket *pkt, uint64_t display_duration)
1109 {
1110  char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
1111  for (; *ptr!=',' && ptr<end-1; ptr++);
1112  if (*ptr == ',')
1113  layer = ++ptr;
1114  for (; *ptr!=',' && ptr<end-1; ptr++);
1115  if (*ptr == ',') {
1116  int64_t end_pts = pkt->pts + display_duration;
1117  int sc = matroska->time_scale * pkt->pts / 10000000;
1118  int ec = matroska->time_scale * end_pts / 10000000;
1119  int sh, sm, ss, eh, em, es, len;
1120  sh = sc/360000; sc -= 360000*sh;
1121  sm = sc/ 6000; sc -= 6000*sm;
1122  ss = sc/ 100; sc -= 100*ss;
1123  eh = ec/360000; ec -= 360000*eh;
1124  em = ec/ 6000; ec -= 6000*em;
1125  es = ec/ 100; ec -= 100*es;
1126  *ptr++ = '\0';
1127  len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1128  if (!(line = av_malloc(len)))
1129  return;
1130  snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1131  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1132  av_free(pkt->data);
1133  pkt->data = line;
1134  pkt->size = strlen(line);
1135  }
1136 }
1137 
1138 static int matroska_merge_packets(AVPacket *out, AVPacket *in)
1139 {
1140  int old_size = out->size;
1141  int ret = av_grow_packet(out, in->size);
1142  if (ret < 0)
1143  return ret;
1144 
1145  memcpy(out->data + old_size, in->data, in->size);
1146 
1147  av_free_packet(in);
1148  av_free(in);
1149  return 0;
1150 }
1151 
1152 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1153  AVDictionary **metadata, char *prefix)
1154 {
1155  MatroskaTag *tags = list->elem;
1156  char key[1024];
1157  int i;
1158 
1159  for (i=0; i < list->nb_elem; i++) {
1160  const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1161 
1162  if (!tags[i].name) {
1163  av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1164  continue;
1165  }
1166  if (prefix) snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1167  else av_strlcpy(key, tags[i].name, sizeof(key));
1168  if (tags[i].def || !lang) {
1169  av_dict_set(metadata, key, tags[i].string, 0);
1170  if (tags[i].sub.nb_elem)
1171  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1172  }
1173  if (lang) {
1174  av_strlcat(key, "-", sizeof(key));
1175  av_strlcat(key, lang, sizeof(key));
1176  av_dict_set(metadata, key, tags[i].string, 0);
1177  if (tags[i].sub.nb_elem)
1178  matroska_convert_tag(s, &tags[i].sub, metadata, key);
1179  }
1180  }
1181  ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1182 }
1183 
1184 static void matroska_convert_tags(AVFormatContext *s)
1185 {
1186  MatroskaDemuxContext *matroska = s->priv_data;
1187  MatroskaTags *tags = matroska->tags.elem;
1188  int i, j;
1189 
1190  for (i=0; i < matroska->tags.nb_elem; i++) {
1191  if (tags[i].target.attachuid) {
1192  MatroskaAttachement *attachment = matroska->attachments.elem;
1193  for (j=0; j<matroska->attachments.nb_elem; j++)
1194  if (attachment[j].uid == tags[i].target.attachuid
1195  && attachment[j].stream)
1196  matroska_convert_tag(s, &tags[i].tag,
1197  &attachment[j].stream->metadata, NULL);
1198  } else if (tags[i].target.chapteruid) {
1199  MatroskaChapter *chapter = matroska->chapters.elem;
1200  for (j=0; j<matroska->chapters.nb_elem; j++)
1201  if (chapter[j].uid == tags[i].target.chapteruid
1202  && chapter[j].chapter)
1203  matroska_convert_tag(s, &tags[i].tag,
1204  &chapter[j].chapter->metadata, NULL);
1205  } else if (tags[i].target.trackuid) {
1206  MatroskaTrack *track = matroska->tracks.elem;
1207  for (j=0; j<matroska->tracks.nb_elem; j++)
1208  if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1209  matroska_convert_tag(s, &tags[i].tag,
1210  &track[j].stream->metadata, NULL);
1211  } else {
1212  matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1213  tags[i].target.type);
1214  }
1215  }
1216 }
1217 
1218 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx)
1219 {
1220  EbmlList *seekhead_list = &matroska->seekhead;
1221  MatroskaSeekhead *seekhead = seekhead_list->elem;
1222  uint32_t level_up = matroska->level_up;
1223  int64_t before_pos = avio_tell(matroska->ctx->pb);
1224  uint32_t saved_id = matroska->current_id;
1225  MatroskaLevel level;
1226  int64_t offset;
1227  int ret = 0;
1228 
1229  if (idx >= seekhead_list->nb_elem
1230  || seekhead[idx].id == MATROSKA_ID_SEEKHEAD
1231  || seekhead[idx].id == MATROSKA_ID_CLUSTER)
1232  return 0;
1233 
1234  /* seek */
1235  offset = seekhead[idx].pos + matroska->segment_start;
1236  if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1237  /* We don't want to lose our seekhead level, so we add
1238  * a dummy. This is a crude hack. */
1239  if (matroska->num_levels == EBML_MAX_DEPTH) {
1240  av_log(matroska->ctx, AV_LOG_INFO,
1241  "Max EBML element depth (%d) reached, "
1242  "cannot parse further.\n", EBML_MAX_DEPTH);
1243  ret = AVERROR_INVALIDDATA;
1244  } else {
1245  level.start = 0;
1246  level.length = (uint64_t)-1;
1247  matroska->levels[matroska->num_levels] = level;
1248  matroska->num_levels++;
1249  matroska->current_id = 0;
1250 
1251  ret = ebml_parse(matroska, matroska_segment, matroska);
1252 
1253  /* remove dummy level */
1254  while (matroska->num_levels) {
1255  uint64_t length = matroska->levels[--matroska->num_levels].length;
1256  if (length == (uint64_t)-1)
1257  break;
1258  }
1259  }
1260  }
1261  /* seek back */
1262  avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1263  matroska->level_up = level_up;
1264  matroska->current_id = saved_id;
1265 
1266  return ret;
1267 }
1268 
1269 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1270 {
1271  EbmlList *seekhead_list = &matroska->seekhead;
1272  int64_t before_pos = avio_tell(matroska->ctx->pb);
1273  int i;
1274 
1275  // we should not do any seeking in the streaming case
1276  if (!matroska->ctx->pb->seekable ||
1277  (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1278  return;
1279 
1280  for (i = 0; i < seekhead_list->nb_elem; i++) {
1281  MatroskaSeekhead *seekhead = seekhead_list->elem;
1282  if (seekhead[i].pos <= before_pos)
1283  continue;
1284 
1285  // defer cues parsing until we actually need cue data.
1286  if (seekhead[i].id == MATROSKA_ID_CUES) {
1287  matroska->cues_parsing_deferred = 1;
1288  continue;
1289  }
1290 
1291  if (matroska_parse_seekhead_entry(matroska, i) < 0)
1292  break;
1293  }
1294 }
1295 
1296 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1297  EbmlList *seekhead_list = &matroska->seekhead;
1298  MatroskaSeekhead *seekhead = seekhead_list->elem;
1299  EbmlList *index_list;
1300  MatroskaIndex *index;
1301  int index_scale = 1;
1302  int i, j;
1303 
1304  for (i = 0; i < seekhead_list->nb_elem; i++)
1305  if (seekhead[i].id == MATROSKA_ID_CUES)
1306  break;
1307  assert(i <= seekhead_list->nb_elem);
1308 
1309  matroska_parse_seekhead_entry(matroska, i);
1310 
1311  index_list = &matroska->index;
1312  index = index_list->elem;
1313  if (index_list->nb_elem
1314  && index[0].time > 1E14/matroska->time_scale) {
1315  av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1316  index_scale = matroska->time_scale;
1317  }
1318  for (i = 0; i < index_list->nb_elem; i++) {
1319  EbmlList *pos_list = &index[i].pos;
1320  MatroskaIndexPos *pos = pos_list->elem;
1321  for (j = 0; j < pos_list->nb_elem; j++) {
1322  MatroskaTrack *track = matroska_find_track_by_num(matroska, pos[j].track);
1323  if (track && track->stream)
1324  av_add_index_entry(track->stream,
1325  pos[j].pos + matroska->segment_start,
1326  index[i].time/index_scale, 0, 0,
1327  AVINDEX_KEYFRAME);
1328  }
1329  }
1330 }
1331 
1332 static int matroska_aac_profile(char *codec_id)
1333 {
1334  static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1335  int profile;
1336 
1337  for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1338  if (strstr(codec_id, aac_profiles[profile]))
1339  break;
1340  return profile + 1;
1341 }
1342 
1343 static int matroska_aac_sri(int samplerate)
1344 {
1345  int sri;
1346 
1347  for (sri=0; sri<FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1348  if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1349  break;
1350  return sri;
1351 }
1352 
1353 static int matroska_read_header(AVFormatContext *s)
1354 {
1355  MatroskaDemuxContext *matroska = s->priv_data;
1356  EbmlList *attachements_list = &matroska->attachments;
1357  MatroskaAttachement *attachements;
1358  EbmlList *chapters_list = &matroska->chapters;
1359  MatroskaChapter *chapters;
1360  MatroskaTrack *tracks;
1361  uint64_t max_start = 0;
1362  Ebml ebml = { 0 };
1363  AVStream *st;
1364  int i, j, res;
1365 
1366  matroska->ctx = s;
1367 
1368  /* First read the EBML header. */
1369  if (ebml_parse(matroska, ebml_syntax, &ebml)
1370  || ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
1371  || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1372  av_log(matroska->ctx, AV_LOG_ERROR,
1373  "EBML header using unsupported features\n"
1374  "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1375  ebml.version, ebml.doctype, ebml.doctype_version);
1376  ebml_free(ebml_syntax, &ebml);
1377  return AVERROR_PATCHWELCOME;
1378  }
1379  for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1380  if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1381  break;
1382  if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1383  av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1384  if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
1385  ebml_free(ebml_syntax, &ebml);
1386  return AVERROR_INVALIDDATA;
1387  }
1388  }
1389  ebml_free(ebml_syntax, &ebml);
1390 
1391  /* The next thing is a segment. */
1392  if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1393  return res;
1394  matroska_execute_seekhead(matroska);
1395 
1396  if (!matroska->time_scale)
1397  matroska->time_scale = 1000000;
1398  if (matroska->duration)
1399  matroska->ctx->duration = matroska->duration * matroska->time_scale
1400  * 1000 / AV_TIME_BASE;
1401  av_dict_set(&s->metadata, "title", matroska->title, 0);
1402 
1403  tracks = matroska->tracks.elem;
1404  for (i=0; i < matroska->tracks.nb_elem; i++) {
1405  MatroskaTrack *track = &tracks[i];
1406  enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1407  EbmlList *encodings_list = &tracks->encodings;
1408  MatroskaTrackEncoding *encodings = encodings_list->elem;
1409  uint8_t *extradata = NULL;
1410  int extradata_size = 0;
1411  int extradata_offset = 0;
1412  AVIOContext b;
1413 
1414  /* Apply some sanity checks. */
1415  if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1416  track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1417  track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1418  av_log(matroska->ctx, AV_LOG_INFO,
1419  "Unknown or unsupported track type %"PRIu64"\n",
1420  track->type);
1421  continue;
1422  }
1423  if (track->codec_id == NULL)
1424  continue;
1425 
1426  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1427  if (!track->default_duration && track->video.frame_rate > 0)
1428  track->default_duration = 1000000000/track->video.frame_rate;
1429  if (!track->video.display_width)
1430  track->video.display_width = track->video.pixel_width;
1431  if (!track->video.display_height)
1432  track->video.display_height = track->video.pixel_height;
1433  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1434  if (!track->audio.out_samplerate)
1435  track->audio.out_samplerate = track->audio.samplerate;
1436  }
1437  if (encodings_list->nb_elem > 1) {
1438  av_log(matroska->ctx, AV_LOG_ERROR,
1439  "Multiple combined encodings not supported");
1440  } else if (encodings_list->nb_elem == 1) {
1441  if (encodings[0].type ||
1442  (
1443 #if CONFIG_ZLIB
1444  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1445 #endif
1446 #if CONFIG_BZLIB
1447  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1448 #endif
1449 #if CONFIG_LZO
1450  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
1451 #endif
1452  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP)) {
1453  encodings[0].scope = 0;
1454  av_log(matroska->ctx, AV_LOG_ERROR,
1455  "Unsupported encoding type");
1456  } else if (track->codec_priv.size && encodings[0].scope&2) {
1457  uint8_t *codec_priv = track->codec_priv.data;
1458  int ret = matroska_decode_buffer(&track->codec_priv.data,
1459  &track->codec_priv.size,
1460  track);
1461  if (ret < 0) {
1462  track->codec_priv.data = NULL;
1463  track->codec_priv.size = 0;
1464  av_log(matroska->ctx, AV_LOG_ERROR,
1465  "Failed to decode codec private data\n");
1466  }
1467 
1468  if (codec_priv != track->codec_priv.data)
1469  av_free(codec_priv);
1470  }
1471  }
1472 
1473  for(j=0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++){
1474  if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1475  strlen(ff_mkv_codec_tags[j].str))){
1476  codec_id= ff_mkv_codec_tags[j].id;
1477  break;
1478  }
1479  }
1480 
1481  st = track->stream = avformat_new_stream(s, NULL);
1482  if (st == NULL)
1483  return AVERROR(ENOMEM);
1484 
1485  if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1486  && track->codec_priv.size >= 40
1487  && track->codec_priv.data != NULL) {
1488  track->ms_compat = 1;
1489  track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1490  codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1491  extradata_offset = 40;
1492  } else if (!strcmp(track->codec_id, "A_MS/ACM")
1493  && track->codec_priv.size >= 14
1494  && track->codec_priv.data != NULL) {
1495  int ret;
1496  ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
1497  AVIO_FLAG_READ, NULL, NULL, NULL, NULL);
1498  ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1499  if (ret < 0)
1500  return ret;
1501  codec_id = st->codec->codec_id;
1502  extradata_offset = FFMIN(track->codec_priv.size, 18);
1503  } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1504  && (track->codec_priv.size >= 86)
1505  && (track->codec_priv.data != NULL)) {
1506  track->video.fourcc = AV_RL32(track->codec_priv.data);
1507  codec_id=ff_codec_get_id(ff_codec_movvideo_tags, track->video.fourcc);
1508  } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
1509  switch (track->audio.bitdepth) {
1510  case 8: codec_id = AV_CODEC_ID_PCM_U8; break;
1511  case 24: codec_id = AV_CODEC_ID_PCM_S24BE; break;
1512  case 32: codec_id = AV_CODEC_ID_PCM_S32BE; break;
1513  }
1514  } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
1515  switch (track->audio.bitdepth) {
1516  case 8: codec_id = AV_CODEC_ID_PCM_U8; break;
1517  case 24: codec_id = AV_CODEC_ID_PCM_S24LE; break;
1518  case 32: codec_id = AV_CODEC_ID_PCM_S32LE; break;
1519  }
1520  } else if (codec_id==AV_CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1521  codec_id = AV_CODEC_ID_PCM_F64LE;
1522  } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
1523  int profile = matroska_aac_profile(track->codec_id);
1524  int sri = matroska_aac_sri(track->audio.samplerate);
1525  extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1526  if (extradata == NULL)
1527  return AVERROR(ENOMEM);
1528  extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1529  extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1530  if (strstr(track->codec_id, "SBR")) {
1531  sri = matroska_aac_sri(track->audio.out_samplerate);
1532  extradata[2] = 0x56;
1533  extradata[3] = 0xE5;
1534  extradata[4] = 0x80 | (sri<<3);
1535  extradata_size = 5;
1536  } else
1537  extradata_size = 2;
1538  } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size) {
1539  /* Only ALAC's magic cookie is stored in Matroska's track headers.
1540  Create the "atom size", "tag", and "tag version" fields the
1541  decoder expects manually. */
1542  extradata_size = 12 + track->codec_priv.size;
1543  extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1544  if (extradata == NULL)
1545  return AVERROR(ENOMEM);
1546  AV_WB32(extradata, extradata_size);
1547  memcpy(&extradata[4], "alac", 4);
1548  AV_WB32(&extradata[8], 0);
1549  memcpy(&extradata[12], track->codec_priv.data,
1550  track->codec_priv.size);
1551  } else if (codec_id == AV_CODEC_ID_TTA) {
1552  extradata_size = 30;
1553  extradata = av_mallocz(extradata_size);
1554  if (extradata == NULL)
1555  return AVERROR(ENOMEM);
1556  ffio_init_context(&b, extradata, extradata_size, 1,
1557  NULL, NULL, NULL, NULL);
1558  avio_write(&b, "TTA1", 4);
1559  avio_wl16(&b, 1);
1560  avio_wl16(&b, track->audio.channels);
1561  avio_wl16(&b, track->audio.bitdepth);
1562  avio_wl32(&b, track->audio.out_samplerate);
1563  avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1564  } else if (codec_id == AV_CODEC_ID_RV10 || codec_id == AV_CODEC_ID_RV20 ||
1565  codec_id == AV_CODEC_ID_RV30 || codec_id == AV_CODEC_ID_RV40) {
1566  extradata_offset = 26;
1567  } else if (codec_id == AV_CODEC_ID_RA_144) {
1568  track->audio.out_samplerate = 8000;
1569  track->audio.channels = 1;
1570  } else if (codec_id == AV_CODEC_ID_RA_288 || codec_id == AV_CODEC_ID_COOK ||
1571  codec_id == AV_CODEC_ID_ATRAC3 || codec_id == AV_CODEC_ID_SIPR) {
1572  int flavor;
1573  ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
1574  0, NULL, NULL, NULL, NULL);
1575  avio_skip(&b, 22);
1576  flavor = avio_rb16(&b);
1577  track->audio.coded_framesize = avio_rb32(&b);
1578  avio_skip(&b, 12);
1579  track->audio.sub_packet_h = avio_rb16(&b);
1580  track->audio.frame_size = avio_rb16(&b);
1581  track->audio.sub_packet_size = avio_rb16(&b);
1582  track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1583  if (codec_id == AV_CODEC_ID_RA_288) {
1584  st->codec->block_align = track->audio.coded_framesize;
1585  track->codec_priv.size = 0;
1586  } else {
1587  if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
1588  const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1589  track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1590  st->codec->bit_rate = sipr_bit_rate[flavor];
1591  }
1592  st->codec->block_align = track->audio.sub_packet_size;
1593  extradata_offset = 78;
1594  }
1595  }
1596  track->codec_priv.size -= extradata_offset;
1597 
1598  if (codec_id == AV_CODEC_ID_NONE)
1599  av_log(matroska->ctx, AV_LOG_INFO,
1600  "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
1601 
1602  if (track->time_scale < 0.01)
1603  track->time_scale = 1.0;
1604  avpriv_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1605 
1606  st->codec->codec_id = codec_id;
1607  st->start_time = 0;
1608  if (strcmp(track->language, "und"))
1609  av_dict_set(&st->metadata, "language", track->language, 0);
1610  av_dict_set(&st->metadata, "title", track->name, 0);
1611 
1612  if (track->flag_default)
1613  st->disposition |= AV_DISPOSITION_DEFAULT;
1614  if (track->flag_forced)
1615  st->disposition |= AV_DISPOSITION_FORCED;
1616 
1617  if (!st->codec->extradata) {
1618  if(extradata){
1619  st->codec->extradata = extradata;
1620  st->codec->extradata_size = extradata_size;
1621  } else if(track->codec_priv.data && track->codec_priv.size > 0){
1622  st->codec->extradata = av_mallocz(track->codec_priv.size +
1623  FF_INPUT_BUFFER_PADDING_SIZE);
1624  if(st->codec->extradata == NULL)
1625  return AVERROR(ENOMEM);
1626  st->codec->extradata_size = track->codec_priv.size;
1627  memcpy(st->codec->extradata,
1628  track->codec_priv.data + extradata_offset,
1629  track->codec_priv.size);
1630  }
1631  }
1632 
1633  if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1634  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1635  st->codec->codec_tag = track->video.fourcc;
1636  st->codec->width = track->video.pixel_width;
1637  st->codec->height = track->video.pixel_height;
1638  av_reduce(&st->sample_aspect_ratio.num,
1639  &st->sample_aspect_ratio.den,
1640  st->codec->height * track->video.display_width,
1641  st->codec-> width * track->video.display_height,
1642  255);
1643  if (st->codec->codec_id != AV_CODEC_ID_H264)
1644  st->need_parsing = AVSTREAM_PARSE_HEADERS;
1645  if (track->default_duration) {
1646  av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1647  1000000000, track->default_duration, 30000);
1648 #if FF_API_R_FRAME_RATE
1649  st->r_frame_rate = st->avg_frame_rate;
1650 #endif
1651  }
1652  } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1653  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1654  st->codec->sample_rate = track->audio.out_samplerate;
1655  st->codec->channels = track->audio.channels;
1656  if (st->codec->codec_id != AV_CODEC_ID_AAC)
1657  st->need_parsing = AVSTREAM_PARSE_HEADERS;
1658  } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1659  st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1660  if (st->codec->codec_id == AV_CODEC_ID_SSA)
1661  matroska->contains_ssa = 1;
1662  }
1663  }
1664 
1665  attachements = attachements_list->elem;
1666  for (j=0; j<attachements_list->nb_elem; j++) {
1667  if (!(attachements[j].filename && attachements[j].mime &&
1668  attachements[j].bin.data && attachements[j].bin.size > 0)) {
1669  av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1670  } else {
1671  AVStream *st = avformat_new_stream(s, NULL);
1672  if (st == NULL)
1673  break;
1674  av_dict_set(&st->metadata, "filename",attachements[j].filename, 0);
1675  av_dict_set(&st->metadata, "mimetype", attachements[j].mime, 0);
1676  st->codec->codec_id = AV_CODEC_ID_NONE;
1677  st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1678  st->codec->extradata = av_malloc(attachements[j].bin.size);
1679  if(st->codec->extradata == NULL)
1680  break;
1681  st->codec->extradata_size = attachements[j].bin.size;
1682  memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1683 
1684  for (i=0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
1685  if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1686  strlen(ff_mkv_mime_tags[i].str))) {
1687  st->codec->codec_id = ff_mkv_mime_tags[i].id;
1688  break;
1689  }
1690  }
1691  attachements[j].stream = st;
1692  }
1693  }
1694 
1695  chapters = chapters_list->elem;
1696  for (i=0; i<chapters_list->nb_elem; i++)
1697  if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1698  && (max_start==0 || chapters[i].start > max_start)) {
1699  chapters[i].chapter =
1700  avpriv_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1701  chapters[i].start, chapters[i].end,
1702  chapters[i].title);
1703  av_dict_set(&chapters[i].chapter->metadata,
1704  "title", chapters[i].title, 0);
1705  max_start = chapters[i].start;
1706  }
1707 
1708  matroska_convert_tags(s);
1709 
1710  return 0;
1711 }
1712 
1713 /*
1714  * Put one packet in an application-supplied AVPacket struct.
1715  * Returns 0 on success or -1 on failure.
1716  */
1717 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1718  AVPacket *pkt)
1719 {
1720  if (matroska->num_packets > 0) {
1721  memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1722  av_free(matroska->packets[0]);
1723  if (matroska->num_packets > 1) {
1724  void *newpackets;
1725  memmove(&matroska->packets[0], &matroska->packets[1],
1726  (matroska->num_packets - 1) * sizeof(AVPacket *));
1727  newpackets = av_realloc(matroska->packets,
1728  (matroska->num_packets - 1) * sizeof(AVPacket *));
1729  if (newpackets)
1730  matroska->packets = newpackets;
1731  } else {
1732  av_freep(&matroska->packets);
1733  matroska->prev_pkt = NULL;
1734  }
1735  matroska->num_packets--;
1736  return 0;
1737  }
1738 
1739  return -1;
1740 }
1741 
1742 /*
1743  * Free all packets in our internal queue.
1744  */
1745 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1746 {
1747  matroska->prev_pkt = NULL;
1748  if (matroska->packets) {
1749  int n;
1750  for (n = 0; n < matroska->num_packets; n++) {
1751  av_free_packet(matroska->packets[n]);
1752  av_free(matroska->packets[n]);
1753  }
1754  av_freep(&matroska->packets);
1755  matroska->num_packets = 0;
1756  }
1757 }
1758 
1759 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
1760  int* buf_size, int type,
1761  uint32_t **lace_buf, int *laces)
1762 {
1763  int res = 0, n, size = *buf_size;
1764  uint8_t *data = *buf;
1765  uint32_t *lace_size;
1766 
1767  if (!type) {
1768  *laces = 1;
1769  *lace_buf = av_mallocz(sizeof(int));
1770  if (!*lace_buf)
1771  return AVERROR(ENOMEM);
1772 
1773  *lace_buf[0] = size;
1774  return 0;
1775  }
1776 
1777  assert(size > 0);
1778  *laces = *data + 1;
1779  data += 1;
1780  size -= 1;
1781  lace_size = av_mallocz(*laces * sizeof(int));
1782  if (!lace_size)
1783  return AVERROR(ENOMEM);
1784 
1785  switch (type) {
1786  case 0x1: /* Xiph lacing */ {
1787  uint8_t temp;
1788  uint32_t total = 0;
1789  for (n = 0; res == 0 && n < *laces - 1; n++) {
1790  while (1) {
1791  if (size == 0) {
1792  res = AVERROR_EOF;
1793  break;
1794  }
1795  temp = *data;
1796  lace_size[n] += temp;
1797  data += 1;
1798  size -= 1;
1799  if (temp != 0xff)
1800  break;
1801  }
1802  total += lace_size[n];
1803  }
1804  if (size <= total) {
1805  res = AVERROR_INVALIDDATA;
1806  break;
1807  }
1808 
1809  lace_size[n] = size - total;
1810  break;
1811  }
1812 
1813  case 0x2: /* fixed-size lacing */
1814  if (size % (*laces)) {
1815  res = AVERROR_INVALIDDATA;
1816  break;
1817  }
1818  for (n = 0; n < *laces; n++)
1819  lace_size[n] = size / *laces;
1820  break;
1821 
1822  case 0x3: /* EBML lacing */ {
1823  uint64_t num;
1824  uint64_t total;
1825  n = matroska_ebmlnum_uint(matroska, data, size, &num);
1826  if (n < 0) {
1827  av_log(matroska->ctx, AV_LOG_INFO,
1828  "EBML block data error\n");
1829  res = n;
1830  break;
1831  }
1832  data += n;
1833  size -= n;
1834  total = lace_size[0] = num;
1835  for (n = 1; res == 0 && n < *laces - 1; n++) {
1836  int64_t snum;
1837  int r;
1838  r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1839  if (r < 0) {
1840  av_log(matroska->ctx, AV_LOG_INFO,
1841  "EBML block data error\n");
1842  res = r;
1843  break;
1844  }
1845  data += r;
1846  size -= r;
1847  lace_size[n] = lace_size[n - 1] + snum;
1848  total += lace_size[n];
1849  }
1850  if (size <= total) {
1851  res = AVERROR_INVALIDDATA;
1852  break;
1853  }
1854  lace_size[*laces - 1] = size - total;
1855  break;
1856  }
1857  }
1858 
1859  *buf = data;
1860  *lace_buf = lace_size;
1861  *buf_size = size;
1862 
1863  return res;
1864 }
1865 
1866 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
1867  MatroskaTrack *track,
1868  AVStream *st,
1869  uint8_t *data, int size,
1870  uint64_t timecode, uint64_t duration,
1871  int64_t pos)
1872 {
1873  int a = st->codec->block_align;
1874  int sps = track->audio.sub_packet_size;
1875  int cfs = track->audio.coded_framesize;
1876  int h = track->audio.sub_packet_h;
1877  int y = track->audio.sub_packet_cnt;
1878  int w = track->audio.frame_size;
1879  int x;
1880 
1881  if (!track->audio.pkt_cnt) {
1882  if (track->audio.sub_packet_cnt == 0)
1883  track->audio.buf_timecode = timecode;
1884  if (st->codec->codec_id == AV_CODEC_ID_RA_288) {
1885  if (size < cfs * h / 2) {
1886  av_log(matroska->ctx, AV_LOG_ERROR,
1887  "Corrupt int4 RM-style audio packet size\n");
1888  return AVERROR_INVALIDDATA;
1889  }
1890  for (x=0; x<h/2; x++)
1891  memcpy(track->audio.buf+x*2*w+y*cfs,
1892  data+x*cfs, cfs);
1893  } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
1894  if (size < w) {
1895  av_log(matroska->ctx, AV_LOG_ERROR,
1896  "Corrupt sipr RM-style audio packet size\n");
1897  return AVERROR_INVALIDDATA;
1898  }
1899  memcpy(track->audio.buf + y*w, data, w);
1900  } else {
1901  if (size < sps * w / sps) {
1902  av_log(matroska->ctx, AV_LOG_ERROR,
1903  "Corrupt generic RM-style audio packet size\n");
1904  return AVERROR_INVALIDDATA;
1905  }
1906  for (x=0; x<w/sps; x++)
1907  memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1908  }
1909 
1910  if (++track->audio.sub_packet_cnt >= h) {
1911  if (st->codec->codec_id == AV_CODEC_ID_SIPR)
1912  ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1913  track->audio.sub_packet_cnt = 0;
1914  track->audio.pkt_cnt = h*w / a;
1915  }
1916  }
1917 
1918  while (track->audio.pkt_cnt) {
1919  AVPacket *pkt = av_mallocz(sizeof(AVPacket));
1920  av_new_packet(pkt, a);
1921  memcpy(pkt->data, track->audio.buf
1922  + a * (h*w / a - track->audio.pkt_cnt--), a);
1923  pkt->pts = track->audio.buf_timecode;
1924  track->audio.buf_timecode = AV_NOPTS_VALUE;
1925  pkt->pos = pos;
1926  pkt->stream_index = st->index;
1927  dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1928  }
1929 
1930  return 0;
1931 }
1932 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
1933  MatroskaTrack *track,
1934  AVStream *st,
1935  uint8_t *data, int pkt_size,
1936  uint64_t timecode, uint64_t duration,
1937  int64_t pos, int is_keyframe)
1938 {
1939  MatroskaTrackEncoding *encodings = track->encodings.elem;
1940  uint8_t *pkt_data = data;
1941  int offset = 0, res;
1942  AVPacket *pkt;
1943 
1944  if (encodings && encodings->scope & 1) {
1945  res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
1946  if (res < 0)
1947  return res;
1948  }
1949 
1950  if (st->codec->codec_id == AV_CODEC_ID_PRORES)
1951  offset = 8;
1952 
1953  pkt = av_mallocz(sizeof(AVPacket));
1954  /* XXX: prevent data copy... */
1955  if (av_new_packet(pkt, pkt_size + offset) < 0) {
1956  av_free(pkt);
1957  return AVERROR(ENOMEM);
1958  }
1959 
1960  if (st->codec->codec_id == AV_CODEC_ID_PRORES) {
1961  uint8_t *buf = pkt->data;
1962  bytestream_put_be32(&buf, pkt_size);
1963  bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
1964  }
1965 
1966  memcpy(pkt->data + offset, pkt_data, pkt_size);
1967 
1968  if (pkt_data != data)
1969  av_free(pkt_data);
1970 
1971  pkt->flags = is_keyframe;
1972  pkt->stream_index = st->index;
1973 
1974  if (track->ms_compat)
1975  pkt->dts = timecode;
1976  else
1977  pkt->pts = timecode;
1978  pkt->pos = pos;
1979  if (st->codec->codec_id == AV_CODEC_ID_TEXT)
1980  pkt->convergence_duration = duration;
1981  else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1982  pkt->duration = duration;
1983 
1984  if (st->codec->codec_id == AV_CODEC_ID_SSA)
1985  matroska_fix_ass_packet(matroska, pkt, duration);
1986 
1987  if (matroska->prev_pkt &&
1988  timecode != AV_NOPTS_VALUE &&
1989  matroska->prev_pkt->pts == timecode &&
1990  matroska->prev_pkt->stream_index == st->index &&
1991  st->codec->codec_id == AV_CODEC_ID_SSA)
1992  matroska_merge_packets(matroska->prev_pkt, pkt);
1993  else {
1994  dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1995  matroska->prev_pkt = pkt;
1996  }
1997 
1998  return 0;
1999 }
2000 
2001 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
2002  int size, int64_t pos, uint64_t cluster_time,
2003  uint64_t block_duration, int is_keyframe,
2004  int64_t cluster_pos)
2005 {
2006  uint64_t timecode = AV_NOPTS_VALUE;
2007  MatroskaTrack *track;
2008  int res = 0;
2009  AVStream *st;
2010  int16_t block_time;
2011  uint32_t *lace_size = NULL;
2012  int n, flags, laces = 0;
2013  uint64_t num, duration;
2014 
2015  if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
2016  av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2017  return n;
2018  }
2019  data += n;
2020  size -= n;
2021 
2022  track = matroska_find_track_by_num(matroska, num);
2023  if (!track || !track->stream) {
2024  av_log(matroska->ctx, AV_LOG_INFO,
2025  "Invalid stream %"PRIu64" or size %u\n", num, size);
2026  return AVERROR_INVALIDDATA;
2027  } else if (size <= 3)
2028  return 0;
2029  st = track->stream;
2030  if (st->discard >= AVDISCARD_ALL)
2031  return res;
2032 
2033  block_time = AV_RB16(data);
2034  data += 2;
2035  flags = *data++;
2036  size -= 3;
2037  if (is_keyframe == -1)
2038  is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
2039 
2040  if (cluster_time != (uint64_t)-1
2041  && (block_time >= 0 || cluster_time >= -block_time)) {
2042  timecode = cluster_time + block_time;
2043  if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
2044  && timecode < track->end_timecode)
2045  is_keyframe = 0; /* overlapping subtitles are not key frame */
2046  if (is_keyframe)
2047  av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
2048  }
2049 
2050  if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
2051  if (!is_keyframe || timecode < matroska->skip_to_timecode)
2052  return res;
2053  matroska->skip_to_keyframe = 0;
2054  }
2055 
2056  res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
2057  &lace_size, &laces);
2058 
2059  if (res)
2060  goto end;
2061 
2062  if (block_duration != AV_NOPTS_VALUE) {
2063  duration = block_duration / laces;
2064  if (block_duration != duration * laces) {
2065  av_log(matroska->ctx, AV_LOG_WARNING,
2066  "Incorrect block_duration, possibly corrupted container");
2067  }
2068  } else {
2069  duration = track->default_duration / matroska->time_scale;
2070  block_duration = duration * laces;
2071  }
2072 
2073  if (timecode != AV_NOPTS_VALUE)
2074  track->end_timecode =
2075  FFMAX(track->end_timecode, timecode + block_duration);
2076 
2077  for (n = 0; n < laces; n++) {
2078  if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
2079  st->codec->codec_id == AV_CODEC_ID_COOK ||
2080  st->codec->codec_id == AV_CODEC_ID_SIPR ||
2081  st->codec->codec_id == AV_CODEC_ID_ATRAC3) &&
2082  st->codec->block_align && track->audio.sub_packet_size) {
2083 
2084  res = matroska_parse_rm_audio(matroska, track, st, data,
2085  lace_size[n],
2086  timecode, duration, pos);
2087  if (res)
2088  goto end;
2089 
2090  } else {
2091  res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
2092  timecode, duration,
2093  pos, !n? is_keyframe : 0);
2094  if (res)
2095  goto end;
2096  }
2097 
2098  if (timecode != AV_NOPTS_VALUE)
2099  timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
2100  data += lace_size[n];
2101  }
2102 
2103 end:
2104  av_free(lace_size);
2105  return res;
2106 }
2107 
2108 static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
2109 {
2110  EbmlList *blocks_list;
2111  MatroskaBlock *blocks;
2112  int i, res;
2113  res = ebml_parse(matroska,
2114  matroska_cluster_incremental_parsing,
2115  &matroska->current_cluster);
2116  if (res == 1) {
2117  /* New Cluster */
2118  if (matroska->current_cluster_pos)
2119  ebml_level_end(matroska);
2120  ebml_free(matroska_cluster, &matroska->current_cluster);
2121  memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
2122  matroska->current_cluster_num_blocks = 0;
2123  matroska->current_cluster_pos = avio_tell(matroska->ctx->pb);
2124  matroska->prev_pkt = NULL;
2125  /* sizeof the ID which was already read */
2126  if (matroska->current_id)
2127  matroska->current_cluster_pos -= 4;
2128  res = ebml_parse(matroska,
2129  matroska_clusters_incremental,
2130  &matroska->current_cluster);
2131  /* Try parsing the block again. */
2132  if (res == 1)
2133  res = ebml_parse(matroska,
2134  matroska_cluster_incremental_parsing,
2135  &matroska->current_cluster);
2136  }
2137 
2138  if (!res &&
2139  matroska->current_cluster_num_blocks <
2140  matroska->current_cluster.blocks.nb_elem) {
2141  blocks_list = &matroska->current_cluster.blocks;
2142  blocks = blocks_list->elem;
2143 
2144  matroska->current_cluster_num_blocks = blocks_list->nb_elem;
2145  i = blocks_list->nb_elem - 1;
2146  if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2147  int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2148  if (!blocks[i].non_simple)
2149  blocks[i].duration = AV_NOPTS_VALUE;
2150  res = matroska_parse_block(matroska,
2151  blocks[i].bin.data, blocks[i].bin.size,
2152  blocks[i].bin.pos,
2153  matroska->current_cluster.timecode,
2154  blocks[i].duration, is_keyframe,
2155  matroska->current_cluster_pos);
2156  }
2157  }
2158 
2159  if (res < 0) matroska->done = 1;
2160  return res;
2161 }
2162 
2163 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
2164 {
2165  MatroskaCluster cluster = { 0 };
2166  EbmlList *blocks_list;
2167  MatroskaBlock *blocks;
2168  int i, res;
2169  int64_t pos;
2170  if (!matroska->contains_ssa)
2171  return matroska_parse_cluster_incremental(matroska);
2172  pos = avio_tell(matroska->ctx->pb);
2173  matroska->prev_pkt = NULL;
2174  if (matroska->current_id)
2175  pos -= 4; /* sizeof the ID which was already read */
2176  res = ebml_parse(matroska, matroska_clusters, &cluster);
2177  blocks_list = &cluster.blocks;
2178  blocks = blocks_list->elem;
2179  for (i=0; i<blocks_list->nb_elem && !res; i++)
2180  if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
2181  int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
2182  if (!blocks[i].non_simple)
2183  blocks[i].duration = AV_NOPTS_VALUE;
2184  res=matroska_parse_block(matroska,
2185  blocks[i].bin.data, blocks[i].bin.size,
2186  blocks[i].bin.pos, cluster.timecode,
2187  blocks[i].duration, is_keyframe,
2188  pos);
2189  }
2190  ebml_free(matroska_cluster, &cluster);
2191  if (res < 0) matroska->done = 1;
2192  return res;
2193 }
2194 
2195 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
2196 {
2197  MatroskaDemuxContext *matroska = s->priv_data;
2198  int ret = 0;
2199 
2200  while (!ret && matroska_deliver_packet(matroska, pkt)) {
2201  if (matroska->done)
2202  return AVERROR_EOF;
2203  ret = matroska_parse_cluster(matroska);
2204  }
2205 
2206  if (ret == AVERROR_INVALIDDATA && pkt->data) {
2207  pkt->flags |= AV_PKT_FLAG_CORRUPT;
2208  return 0;
2209  }
2210 
2211  return ret;
2212 }
2213 
2214 static int matroska_read_seek(AVFormatContext *s, int stream_index,
2215  int64_t timestamp, int flags)
2216 {
2217  MatroskaDemuxContext *matroska = s->priv_data;
2218  MatroskaTrack *tracks = matroska->tracks.elem;
2219  AVStream *st = s->streams[stream_index];
2220  int i, index, index_sub, index_min;
2221 
2222  /* Parse the CUES now since we need the index data to seek. */
2223  if (matroska->cues_parsing_deferred) {
2224  matroska_parse_cues(matroska);
2225  matroska->cues_parsing_deferred = 0;
2226  }
2227 
2228  if (!st->nb_index_entries)
2229  return 0;
2230  timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
2231 
2232  if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2233  avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
2234  matroska->current_id = 0;
2235  while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
2236  matroska_clear_queue(matroska);
2237  if (matroska_parse_cluster(matroska) < 0)
2238  break;
2239  }
2240  }
2241 
2242  matroska_clear_queue(matroska);
2243  if (index < 0)
2244  return 0;
2245 
2246  index_min = index;
2247  for (i=0; i < matroska->tracks.nb_elem; i++) {
2248  tracks[i].audio.pkt_cnt = 0;
2249  tracks[i].audio.sub_packet_cnt = 0;
2250  tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2251  tracks[i].end_timecode = 0;
2252  if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
2253  && !tracks[i].stream->discard != AVDISCARD_ALL) {
2254  index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
2255  if (index_sub >= 0
2256  && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
2257  && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
2258  index_min = index_sub;
2259  }
2260  }
2261 
2262  avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2263  matroska->current_id = 0;
2264  matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
2265  matroska->skip_to_timecode = st->index_entries[index].timestamp;
2266  matroska->done = 0;
2267  ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2268  return 0;
2269 }
2270 
2271 static int matroska_read_close(AVFormatContext *s)
2272 {
2273  MatroskaDemuxContext *matroska = s->priv_data;
2274  MatroskaTrack *tracks = matroska->tracks.elem;
2275  int n;
2276 
2277  matroska_clear_queue(matroska);
2278 
2279  for (n=0; n < matroska->tracks.nb_elem; n++)
2280  if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
2281  av_free(tracks[n].audio.buf);
2282  ebml_free(matroska_cluster, &matroska->current_cluster);
2283  ebml_free(matroska_segment, matroska);
2284 
2285  return 0;
2286 }
2287 
2288 AVInputFormat ff_matroska_demuxer = {
2289  .name = "matroska,webm",
2290  .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
2291  .priv_data_size = sizeof(MatroskaDemuxContext),
2292  .read_probe = matroska_probe,
2293  .read_header = matroska_read_header,
2294  .read_packet = matroska_read_packet,
2295  .read_close = matroska_read_close,
2296  .read_seek = matroska_read_seek,
2297 };