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cosmetics: line wrap and vertical alignment
[FFMpeg-mirror/lagarith.git] / libavformat / matroskadec.c
blobac12f1ea6654ece2b5a29f6286048c43dfb8d983
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 libavformat/matroskadec.c
24 * Matroska file demuxer
25 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26 * with a little help from Moritz Bunkus <moritz@bunkus.org>
27 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28 * Specs available on the Matroska project page: http://www.matroska.org/.
29 */
30
31 #include <stdio.h>
32 #include "avformat.h"
33 /* For codec_get_id(). */
34 #include "riff.h"
35 #include "isom.h"
36 #include "matroska.h"
37 #include "libavcodec/mpeg4audio.h"
38 #include "libavutil/intfloat_readwrite.h"
39 #include "libavutil/intreadwrite.h"
40 #include "libavutil/avstring.h"
41 #include "libavutil/lzo.h"
42 #if CONFIG_ZLIB
43 #include <zlib.h>
44 #endif
45 #if CONFIG_BZLIB
46 #include <bzlib.h>
47 #endif
48
49 typedef enum {
50 EBML_NONE,
51 EBML_UINT,
52 EBML_FLOAT,
53 EBML_STR,
54 EBML_UTF8,
55 EBML_BIN,
56 EBML_NEST,
57 EBML_PASS,
58 EBML_STOP,
59 } EbmlType;
60
61 typedef const struct EbmlSyntax {
62 uint32_t id;
63 EbmlType type;
64 int list_elem_size;
65 int data_offset;
66 union {
67 uint64_t u;
68 double f;
69 const char *s;
70 const struct EbmlSyntax *n;
71 } def;
72 } EbmlSyntax;
73
74 typedef struct {
75 int nb_elem;
76 void *elem;
77 } EbmlList;
78
79 typedef struct {
80 int size;
81 uint8_t *data;
82 int64_t pos;
83 } EbmlBin;
84
85 typedef struct {
86 uint64_t version;
87 uint64_t max_size;
88 uint64_t id_length;
89 char *doctype;
90 uint64_t doctype_version;
91 } Ebml;
92
93 typedef struct {
94 uint64_t algo;
95 EbmlBin settings;
96 } MatroskaTrackCompression;
97
98 typedef struct {
99 uint64_t scope;
100 uint64_t type;
101 MatroskaTrackCompression compression;
102 } MatroskaTrackEncoding;
103
104 typedef struct {
105 double frame_rate;
106 uint64_t display_width;
107 uint64_t display_height;
108 uint64_t pixel_width;
109 uint64_t pixel_height;
110 uint64_t fourcc;
111 } MatroskaTrackVideo;
112
113 typedef struct {
114 double samplerate;
115 double out_samplerate;
116 uint64_t bitdepth;
117 uint64_t channels;
118
119 /* real audio header (extracted from extradata) */
120 int coded_framesize;
121 int sub_packet_h;
122 int frame_size;
123 int sub_packet_size;
124 int sub_packet_cnt;
125 int pkt_cnt;
126 uint8_t *buf;
127 } MatroskaTrackAudio;
128
129 typedef struct {
130 uint64_t num;
131 uint64_t uid;
132 uint64_t type;
133 char *name;
134 char *codec_id;
135 EbmlBin codec_priv;
136 char *language;
137 double time_scale;
138 uint64_t default_duration;
139 uint64_t flag_default;
140 MatroskaTrackVideo video;
141 MatroskaTrackAudio audio;
142 EbmlList encodings;
143
144 AVStream *stream;
145 int64_t end_timecode;
146 } MatroskaTrack;
147
148 typedef struct {
149 uint64_t uid;
150 char *filename;
151 char *mime;
152 EbmlBin bin;
153
154 AVStream *stream;
155 } MatroskaAttachement;
156
157 typedef struct {
158 uint64_t start;
159 uint64_t end;
160 uint64_t uid;
161 char *title;
162
163 AVChapter *chapter;
164 } MatroskaChapter;
165
166 typedef struct {
167 uint64_t track;
168 uint64_t pos;
169 } MatroskaIndexPos;
170
171 typedef struct {
172 uint64_t time;
173 EbmlList pos;
174 } MatroskaIndex;
175
176 typedef struct {
177 char *name;
178 char *string;
179 char *lang;
180 uint64_t def;
181 EbmlList sub;
182 } MatroskaTag;
183
184 typedef struct {
185 char *type;
186 uint64_t typevalue;
187 uint64_t trackuid;
188 uint64_t chapteruid;
189 uint64_t attachuid;
190 } MatroskaTagTarget;
191
192 typedef struct {
193 MatroskaTagTarget target;
194 EbmlList tag;
195 } MatroskaTags;
196
197 typedef struct {
198 uint64_t id;
199 uint64_t pos;
200 } MatroskaSeekhead;
201
202 typedef struct {
203 uint64_t start;
204 uint64_t length;
205 } MatroskaLevel;
206
207 typedef struct {
208 AVFormatContext *ctx;
209
210 /* EBML stuff */
211 int num_levels;
212 MatroskaLevel levels[EBML_MAX_DEPTH];
213 int level_up;
214
215 uint64_t time_scale;
216 double duration;
217 char *title;
218 EbmlList tracks;
219 EbmlList attachments;
220 EbmlList chapters;
221 EbmlList index;
222 EbmlList tags;
223 EbmlList seekhead;
224
225 /* byte position of the segment inside the stream */
226 int64_t segment_start;
227
228 /* the packet queue */
229 AVPacket **packets;
230 int num_packets;
231 AVPacket *prev_pkt;
232
233 int done;
234 int has_cluster_id;
235
236 /* What to skip before effectively reading a packet. */
237 int skip_to_keyframe;
238 uint64_t skip_to_timecode;
239 } MatroskaDemuxContext;
240
241 typedef struct {
242 uint64_t duration;
243 int64_t reference;
244 EbmlBin bin;
245 } MatroskaBlock;
246
247 typedef struct {
248 uint64_t timecode;
249 EbmlList blocks;
250 } MatroskaCluster;
251
252 static EbmlSyntax ebml_header[] = {
253 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
254 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
255 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
256 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
257 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
258 { EBML_ID_EBMLVERSION, EBML_NONE },
259 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
260 { 0 }
261 };
262
263 static EbmlSyntax ebml_syntax[] = {
264 { EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
265 { 0 }
266 };
267
268 static EbmlSyntax matroska_info[] = {
269 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
270 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
271 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
272 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
273 { MATROSKA_ID_MUXINGAPP, EBML_NONE },
274 { MATROSKA_ID_DATEUTC, EBML_NONE },
275 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
276 { 0 }
277 };
278
279 static EbmlSyntax matroska_track_video[] = {
280 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
281 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
282 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
283 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
284 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
285 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
286 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
287 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
288 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
289 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
290 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
291 { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
292 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
293 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
294 { 0 }
295 };
296
297 static EbmlSyntax matroska_track_audio[] = {
298 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
299 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
300 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
301 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
302 { 0 }
303 };
304
305 static EbmlSyntax matroska_track_encoding_compression[] = {
306 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
307 { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
308 { 0 }
309 };
310
311 static EbmlSyntax matroska_track_encoding[] = {
312 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
313 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
314 { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
315 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
316 { 0 }
317 };
318
319 static EbmlSyntax matroska_track_encodings[] = {
320 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
321 { 0 }
322 };
323
324 static EbmlSyntax matroska_track[] = {
325 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
326 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
327 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
328 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
329 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
330 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
331 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
332 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
333 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
334 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
335 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
336 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
337 { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
338 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
339 { MATROSKA_ID_TRACKFLAGFORCED, EBML_NONE },
340 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
341 { MATROSKA_ID_CODECNAME, EBML_NONE },
342 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
343 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
344 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
345 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
346 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
347 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_NONE },
348 { 0 }
349 };
350
351 static EbmlSyntax matroska_tracks[] = {
352 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
353 { 0 }
354 };
355
356 static EbmlSyntax matroska_attachment[] = {
357 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
358 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
359 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
360 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
361 { MATROSKA_ID_FILEDESC, EBML_NONE },
362 { 0 }
363 };
364
365 static EbmlSyntax matroska_attachments[] = {
366 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
367 { 0 }
368 };
369
370 static EbmlSyntax matroska_chapter_display[] = {
371 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
372 { MATROSKA_ID_CHAPLANG, EBML_NONE },
373 { 0 }
374 };
375
376 static EbmlSyntax matroska_chapter_entry[] = {
377 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
378 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
379 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
380 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
381 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
382 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
383 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
384 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
385 { 0 }
386 };
387
388 static EbmlSyntax matroska_chapter[] = {
389 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
390 { MATROSKA_ID_EDITIONUID, EBML_NONE },
391 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
392 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
393 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
394 { 0 }
395 };
396
397 static EbmlSyntax matroska_chapters[] = {
398 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
399 { 0 }
400 };
401
402 static EbmlSyntax matroska_index_pos[] = {
403 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
404 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
405 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
406 { 0 }
407 };
408
409 static EbmlSyntax matroska_index_entry[] = {
410 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
411 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
412 { 0 }
413 };
414
415 static EbmlSyntax matroska_index[] = {
416 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
417 { 0 }
418 };
419
420 static EbmlSyntax matroska_simpletag[] = {
421 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag,name) },
422 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag,string) },
423 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag,lang), {.s="und"} },
424 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag,def) },
425 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
426 { 0 }
427 };
428
429 static EbmlSyntax matroska_tagtargets[] = {
430 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget,type) },
431 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
432 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
433 { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
434 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
435 { 0 }
436 };
437
438 static EbmlSyntax matroska_tag[] = {
439 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
440 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
441 { 0 }
442 };
443
444 static EbmlSyntax matroska_tags[] = {
445 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
446 { 0 }
447 };
448
449 static EbmlSyntax matroska_seekhead_entry[] = {
450 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
451 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
452 { 0 }
453 };
454
455 static EbmlSyntax matroska_seekhead[] = {
456 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
457 { 0 }
458 };
459
460 static EbmlSyntax matroska_segment[] = {
461 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, {.n=matroska_info } },
462 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, {.n=matroska_tracks } },
463 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, {.n=matroska_attachments} },
464 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, {.n=matroska_chapters } },
465 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, {.n=matroska_index } },
466 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, {.n=matroska_tags } },
467 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, {.n=matroska_seekhead } },
468 { MATROSKA_ID_CLUSTER, EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
469 { 0 }
470 };
471
472 static EbmlSyntax matroska_segments[] = {
473 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, {.n=matroska_segment } },
474 { 0 }
475 };
476
477 static EbmlSyntax matroska_blockgroup[] = {
478 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
479 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
480 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
481 { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
482 { 0 }
483 };
484
485 static EbmlSyntax matroska_cluster[] = {
486 { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
487 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
488 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
489 { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
490 { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
491 { 0 }
492 };
493
494 static EbmlSyntax matroska_clusters[] = {
495 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster} },
496 { MATROSKA_ID_INFO, EBML_NONE },
497 { MATROSKA_ID_CUES, EBML_NONE },
498 { MATROSKA_ID_TAGS, EBML_NONE },
499 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
500 { 0 }
501 };
502
503 /*
504 * Return: Whether we reached the end of a level in the hierarchy or not.
505 */
506 static int ebml_level_end(MatroskaDemuxContext *matroska)
507 {
508 ByteIOContext *pb = matroska->ctx->pb;
509 int64_t pos = url_ftell(pb);
510
511 if (matroska->num_levels > 0) {
512 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
513 if (pos - level->start >= level->length) {
514 matroska->num_levels--;
515 return 1;
516 }
517 }
518 return 0;
519 }
520
521 /*
522 * Read: an "EBML number", which is defined as a variable-length
523 * array of bytes. The first byte indicates the length by giving a
524 * number of 0-bits followed by a one. The position of the first
525 * "one" bit inside the first byte indicates the length of this
526 * number.
527 * Returns: number of bytes read, < 0 on error
528 */
529 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
530 int max_size, uint64_t *number)
531 {
532 int len_mask = 0x80, read = 1, n = 1;
533 int64_t total = 0;
534
535 /* The first byte tells us the length in bytes - get_byte() can normally
536 * return 0, but since that's not a valid first ebmlID byte, we can
537 * use it safely here to catch EOS. */
538 if (!(total = get_byte(pb))) {
539 /* we might encounter EOS here */
540 if (!url_feof(pb)) {
541 int64_t pos = url_ftell(pb);
542 av_log(matroska->ctx, AV_LOG_ERROR,
543 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
544 pos, pos);
545 }
546 return AVERROR(EIO); /* EOS or actual I/O error */
547 }
548
549 /* get the length of the EBML number */
550 while (read <= max_size && !(total & len_mask)) {
551 read++;
552 len_mask >>= 1;
553 }
554 if (read > max_size) {
555 int64_t pos = url_ftell(pb) - 1;
556 av_log(matroska->ctx, AV_LOG_ERROR,
557 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
558 (uint8_t) total, pos, pos);
559 return AVERROR_INVALIDDATA;
560 }
561
562 /* read out length */
563 total &= ~len_mask;
564 while (n++ < read)
565 total = (total << 8) | get_byte(pb);
566
567 *number = total;
568
569 return read;
570 }
571
572 /*
573 * Read the next element as an unsigned int.
574 * 0 is success, < 0 is failure.
575 */
576 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
577 {
578 int n = 0;
579
580 if (size < 1 || size > 8)
581 return AVERROR_INVALIDDATA;
582
583 /* big-endian ordering; build up number */
584 *num = 0;
585 while (n++ < size)
586 *num = (*num << 8) | get_byte(pb);
587
588 return 0;
589 }
590
591 /*
592 * Read the next element as a float.
593 * 0 is success, < 0 is failure.
594 */
595 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
596 {
597 if (size == 4) {
598 *num= av_int2flt(get_be32(pb));
599 } else if(size==8){
600 *num= av_int2dbl(get_be64(pb));
601 } else
602 return AVERROR_INVALIDDATA;
603
604 return 0;
605 }
606
607 /*
608 * Read the next element as an ASCII string.
609 * 0 is success, < 0 is failure.
610 */
611 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
612 {
613 av_free(*str);
614 /* EBML strings are usually not 0-terminated, so we allocate one
615 * byte more, read the string and NULL-terminate it ourselves. */
616 if (!(*str = av_malloc(size + 1)))
617 return AVERROR(ENOMEM);
618 if (get_buffer(pb, (uint8_t *) *str, size) != size) {
619 av_free(*str);
620 return AVERROR(EIO);
621 }
622 (*str)[size] = '\0';
623
624 return 0;
625 }
626
627 /*
628 * Read the next element as binary data.
629 * 0 is success, < 0 is failure.
630 */
631 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
632 {
633 av_free(bin->data);
634 if (!(bin->data = av_malloc(length)))
635 return AVERROR(ENOMEM);
636
637 bin->size = length;
638 bin->pos = url_ftell(pb);
639 if (get_buffer(pb, bin->data, length) != length)
640 return AVERROR(EIO);
641
642 return 0;
643 }
644
645 /*
646 * Read the next element, but only the header. The contents
647 * are supposed to be sub-elements which can be read separately.
648 * 0 is success, < 0 is failure.
649 */
650 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
651 {
652 ByteIOContext *pb = matroska->ctx->pb;
653 MatroskaLevel *level;
654
655 if (matroska->num_levels >= EBML_MAX_DEPTH) {
656 av_log(matroska->ctx, AV_LOG_ERROR,
657 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
658 return AVERROR(ENOSYS);
659 }
660
661 level = &matroska->levels[matroska->num_levels++];
662 level->start = url_ftell(pb);
663 level->length = length;
664
665 return 0;
666 }
667
668 /*
669 * Read signed/unsigned "EBML" numbers.
670 * Return: number of bytes processed, < 0 on error
671 */
672 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
673 uint8_t *data, uint32_t size, uint64_t *num)
674 {
675 ByteIOContext pb;
676 init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
677 return ebml_read_num(matroska, &pb, 8, num);
678 }
679
680 /*
681 * Same as above, but signed.
682 */
683 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
684 uint8_t *data, uint32_t size, int64_t *num)
685 {
686 uint64_t unum;
687 int res;
688
689 /* read as unsigned number first */
690 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
691 return res;
692
693 /* make signed (weird way) */
694 *num = unum - ((1LL << (7*res - 1)) - 1);
695
696 return res;
697 }
698
699 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
700 EbmlSyntax *syntax, void *data);
701
702 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
703 uint32_t id, void *data)
704 {
705 int i;
706 for (i=0; syntax[i].id; i++)
707 if (id == syntax[i].id)
708 break;
709 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
710 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
711 return ebml_parse_elem(matroska, &syntax[i], data);
712 }
713
714 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
715 void *data)
716 {
717 uint64_t id;
718 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
719 id |= 1 << 7*res;
720 return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
721 }
722
723 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
724 void *data)
725 {
726 int i, res = 0;
727
728 for (i=0; syntax[i].id; i++)
729 switch (syntax[i].type) {
730 case EBML_UINT:
731 *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
732 break;
733 case EBML_FLOAT:
734 *(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
735 break;
736 case EBML_STR:
737 case EBML_UTF8:
738 *(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
739 break;
740 }
741
742 while (!res && !ebml_level_end(matroska))
743 res = ebml_parse(matroska, syntax, data);
744
745 return res;
746 }
747
748 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
749 EbmlSyntax *syntax, void *data)
750 {
751 ByteIOContext *pb = matroska->ctx->pb;
752 uint32_t id = syntax->id;
753 uint64_t length;
754 int res;
755
756 data = (char *)data + syntax->data_offset;
757 if (syntax->list_elem_size) {
758 EbmlList *list = data;
759 list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
760 data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
761 memset(data, 0, syntax->list_elem_size);
762 list->nb_elem++;
763 }
764
765 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
766 if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
767 return res;
768
769 switch (syntax->type) {
770 case EBML_UINT: res = ebml_read_uint (pb, length, data); break;
771 case EBML_FLOAT: res = ebml_read_float (pb, length, data); break;
772 case EBML_STR:
773 case EBML_UTF8: res = ebml_read_ascii (pb, length, data); break;
774 case EBML_BIN: res = ebml_read_binary(pb, length, data); break;
775 case EBML_NEST: if ((res=ebml_read_master(matroska, length)) < 0)
776 return res;
777 if (id == MATROSKA_ID_SEGMENT)
778 matroska->segment_start = url_ftell(matroska->ctx->pb);
779 return ebml_parse_nest(matroska, syntax->def.n, data);
780 case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data);
781 case EBML_STOP: *(int *)data = 1; return 1;
782 default: return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
783 }
784 if (res == AVERROR_INVALIDDATA)
785 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
786 else if (res == AVERROR(EIO))
787 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
788 return res;
789 }
790
791 static void ebml_free(EbmlSyntax *syntax, void *data)
792 {
793 int i, j;
794 for (i=0; syntax[i].id; i++) {
795 void *data_off = (char *)data + syntax[i].data_offset;
796 switch (syntax[i].type) {
797 case EBML_STR:
798 case EBML_UTF8: av_freep(data_off); break;
799 case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
800 case EBML_NEST:
801 if (syntax[i].list_elem_size) {
802 EbmlList *list = data_off;
803 char *ptr = list->elem;
804 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
805 ebml_free(syntax[i].def.n, ptr);
806 av_free(list->elem);
807 } else
808 ebml_free(syntax[i].def.n, data_off);
809 default: break;
810 }
811 }
812 }
813
814
815 /*
816 * Autodetecting...
817 */
818 static int matroska_probe(AVProbeData *p)
819 {
820 uint64_t total = 0;
821 int len_mask = 0x80, size = 1, n = 1;
822 static const char probe_data[] = "matroska";
823
824 /* EBML header? */
825 if (AV_RB32(p->buf) != EBML_ID_HEADER)
826 return 0;
827
828 /* length of header */
829 total = p->buf[4];
830 while (size <= 8 && !(total & len_mask)) {
831 size++;
832 len_mask >>= 1;
833 }
834 if (size > 8)
835 return 0;
836 total &= (len_mask - 1);
837 while (n < size)
838 total = (total << 8) | p->buf[4 + n++];
839
840 /* Does the probe data contain the whole header? */
841 if (p->buf_size < 4 + size + total)
842 return 0;
843
844 /* The header must contain the document type 'matroska'. For now,
845 * we don't parse the whole header but simply check for the
846 * availability of that array of characters inside the header.
847 * Not fully fool-proof, but good enough. */
848 for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
849 if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
850 return AVPROBE_SCORE_MAX;
851
852 return 0;
853 }
854
855 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
856 int num)
857 {
858 MatroskaTrack *tracks = matroska->tracks.elem;
859 int i;
860
861 for (i=0; i < matroska->tracks.nb_elem; i++)
862 if (tracks[i].num == num)
863 return &tracks[i];
864
865 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
866 return NULL;
867 }
868
869 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
870 MatroskaTrack *track)
871 {
872 MatroskaTrackEncoding *encodings = track->encodings.elem;
873 uint8_t* data = *buf;
874 int isize = *buf_size;
875 uint8_t* pkt_data = NULL;
876 int pkt_size = isize;
877 int result = 0;
878 int olen;
879
880 switch (encodings[0].compression.algo) {
881 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
882 return encodings[0].compression.settings.size;
883 case MATROSKA_TRACK_ENCODING_COMP_LZO:
884 do {
885 olen = pkt_size *= 3;
886 pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
887 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
888 } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
889 if (result)
890 goto failed;
891 pkt_size -= olen;
892 break;
893 #if CONFIG_ZLIB
894 case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
895 z_stream zstream = {0};
896 if (inflateInit(&zstream) != Z_OK)
897 return -1;
898 zstream.next_in = data;
899 zstream.avail_in = isize;
900 do {
901 pkt_size *= 3;
902 pkt_data = av_realloc(pkt_data, pkt_size);
903 zstream.avail_out = pkt_size - zstream.total_out;
904 zstream.next_out = pkt_data + zstream.total_out;
905 result = inflate(&zstream, Z_NO_FLUSH);
906 } while (result==Z_OK && pkt_size<10000000);
907 pkt_size = zstream.total_out;
908 inflateEnd(&zstream);
909 if (result != Z_STREAM_END)
910 goto failed;
911 break;
912 }
913 #endif
914 #if CONFIG_BZLIB
915 case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
916 bz_stream bzstream = {0};
917 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
918 return -1;
919 bzstream.next_in = data;
920 bzstream.avail_in = isize;
921 do {
922 pkt_size *= 3;
923 pkt_data = av_realloc(pkt_data, pkt_size);
924 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
925 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
926 result = BZ2_bzDecompress(&bzstream);
927 } while (result==BZ_OK && pkt_size<10000000);
928 pkt_size = bzstream.total_out_lo32;
929 BZ2_bzDecompressEnd(&bzstream);
930 if (result != BZ_STREAM_END)
931 goto failed;
932 break;
933 }
934 #endif
935 default:
936 return -1;
937 }
938
939 *buf = pkt_data;
940 *buf_size = pkt_size;
941 return 0;
942 failed:
943 av_free(pkt_data);
944 return -1;
945 }
946
947 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
948 AVPacket *pkt, uint64_t display_duration)
949 {
950 char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
951 for (; *ptr!=',' && ptr<end-1; ptr++);
952 if (*ptr == ',')
953 layer = ++ptr;
954 for (; *ptr!=',' && ptr<end-1; ptr++);
955 if (*ptr == ',') {
956 int64_t end_pts = pkt->pts + display_duration;
957 int sc = matroska->time_scale * pkt->pts / 10000000;
958 int ec = matroska->time_scale * end_pts / 10000000;
959 int sh, sm, ss, eh, em, es, len;
960 sh = sc/360000; sc -= 360000*sh;
961 sm = sc/ 6000; sc -= 6000*sm;
962 ss = sc/ 100; sc -= 100*ss;
963 eh = ec/360000; ec -= 360000*eh;
964 em = ec/ 6000; ec -= 6000*em;
965 es = ec/ 100; ec -= 100*es;
966 *ptr++ = '\0';
967 len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
968 if (!(line = av_malloc(len)))
969 return;
970 snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
971 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
972 av_free(pkt->data);
973 pkt->data = line;
974 pkt->size = strlen(line);
975 }
976 }
977
978 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
979 {
980 out->data = av_realloc(out->data, out->size+in->size);
981 memcpy(out->data+out->size, in->data, in->size);
982 out->size += in->size;
983 av_destruct_packet(in);
984 av_free(in);
985 }
986
987 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
988 AVMetadata **metadata, char *prefix)
989 {
990 MatroskaTag *tags = list->elem;
991 char key[1024];
992 int i;
993
994 for (i=0; i < list->nb_elem; i++) {
995 const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
996 if (prefix) snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
997 else av_strlcpy(key, tags[i].name, sizeof(key));
998 if (tags[i].def || !lang) {
999 av_metadata_set(metadata, key, tags[i].string);
1000 if (tags[i].sub.nb_elem)
1001 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1002 }
1003 if (lang) {
1004 av_strlcat(key, "-", sizeof(key));
1005 av_strlcat(key, lang, sizeof(key));
1006 av_metadata_set(metadata, key, tags[i].string);
1007 if (tags[i].sub.nb_elem)
1008 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1009 }
1010 }
1011 }
1012
1013 static void matroska_convert_tags(AVFormatContext *s)
1014 {
1015 MatroskaDemuxContext *matroska = s->priv_data;
1016 MatroskaTags *tags = matroska->tags.elem;
1017 int i, j;
1018
1019 for (i=0; i < matroska->tags.nb_elem; i++) {
1020 if (tags[i].target.attachuid) {
1021 MatroskaAttachement *attachment = matroska->attachments.elem;
1022 for (j=0; j<matroska->attachments.nb_elem; j++)
1023 if (attachment[j].uid == tags[i].target.attachuid)
1024 matroska_convert_tag(s, &tags[i].tag,
1025 &attachment[j].stream->metadata, NULL);
1026 } else if (tags[i].target.chapteruid) {
1027 MatroskaChapter *chapter = matroska->chapters.elem;
1028 for (j=0; j<matroska->chapters.nb_elem; j++)
1029 if (chapter[j].uid == tags[i].target.chapteruid)
1030 matroska_convert_tag(s, &tags[i].tag,
1031 &chapter[j].chapter->metadata, NULL);
1032 } else if (tags[i].target.trackuid) {
1033 MatroskaTrack *track = matroska->tracks.elem;
1034 for (j=0; j<matroska->tracks.nb_elem; j++)
1035 if (track[j].uid == tags[i].target.trackuid)
1036 matroska_convert_tag(s, &tags[i].tag,
1037 &track[j].stream->metadata, NULL);
1038 } else {
1039 matroska_convert_tag(s, &tags[i].tag, &s->metadata, NULL);
1040 }
1041 }
1042 }
1043
1044 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1045 {
1046 EbmlList *seekhead_list = &matroska->seekhead;
1047 MatroskaSeekhead *seekhead = seekhead_list->elem;
1048 uint32_t level_up = matroska->level_up;
1049 int64_t before_pos = url_ftell(matroska->ctx->pb);
1050 MatroskaLevel level;
1051 int i;
1052
1053 for (i=0; i<seekhead_list->nb_elem; i++) {
1054 int64_t offset = seekhead[i].pos + matroska->segment_start;
1055
1056 if (seekhead[i].pos <= before_pos
1057 || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1058 || seekhead[i].id == MATROSKA_ID_CLUSTER)
1059 continue;
1060
1061 /* seek */
1062 if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1063 continue;
1064
1065 /* We don't want to lose our seekhead level, so we add
1066 * a dummy. This is a crude hack. */
1067 if (matroska->num_levels == EBML_MAX_DEPTH) {
1068 av_log(matroska->ctx, AV_LOG_INFO,
1069 "Max EBML element depth (%d) reached, "
1070 "cannot parse further.\n", EBML_MAX_DEPTH);
1071 break;
1072 }
1073
1074 level.start = 0;
1075 level.length = (uint64_t)-1;
1076 matroska->levels[matroska->num_levels] = level;
1077 matroska->num_levels++;
1078
1079 ebml_parse(matroska, matroska_segment, matroska);
1080
1081 /* remove dummy level */
1082 while (matroska->num_levels) {
1083 uint64_t length = matroska->levels[--matroska->num_levels].length;
1084 if (length == (uint64_t)-1)
1085 break;
1086 }
1087 }
1088
1089 /* seek back */
1090 url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1091 matroska->level_up = level_up;
1092 }
1093
1094 static int matroska_aac_profile(char *codec_id)
1095 {
1096 static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1097 int profile;
1098
1099 for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1100 if (strstr(codec_id, aac_profiles[profile]))
1101 break;
1102 return profile + 1;
1103 }
1104
1105 static int matroska_aac_sri(int samplerate)
1106 {
1107 int sri;
1108
1109 for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1110 if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1111 break;
1112 return sri;
1113 }
1114
1115 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1116 {
1117 MatroskaDemuxContext *matroska = s->priv_data;
1118 EbmlList *attachements_list = &matroska->attachments;
1119 MatroskaAttachement *attachements;
1120 EbmlList *chapters_list = &matroska->chapters;
1121 MatroskaChapter *chapters;
1122 MatroskaTrack *tracks;
1123 EbmlList *index_list;
1124 MatroskaIndex *index;
1125 int index_scale = 1;
1126 uint64_t max_start = 0;
1127 Ebml ebml = { 0 };
1128 AVStream *st;
1129 int i, j;
1130
1131 matroska->ctx = s;
1132
1133 /* First read the EBML header. */
1134 if (ebml_parse(matroska, ebml_syntax, &ebml)
1135 || ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
1136 || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1137 || ebml.doctype_version > 2) {
1138 av_log(matroska->ctx, AV_LOG_ERROR,
1139 "EBML header using unsupported features\n"
1140 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1141 ebml.version, ebml.doctype, ebml.doctype_version);
1142 return AVERROR_NOFMT;
1143 }
1144 ebml_free(ebml_syntax, &ebml);
1145
1146 /* The next thing is a segment. */
1147 if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1148 return -1;
1149 matroska_execute_seekhead(matroska);
1150
1151 if (matroska->duration)
1152 matroska->ctx->duration = matroska->duration * matroska->time_scale
1153 * 1000 / AV_TIME_BASE;
1154 av_metadata_set(&s->metadata, "title", matroska->title);
1155
1156 tracks = matroska->tracks.elem;
1157 for (i=0; i < matroska->tracks.nb_elem; i++) {
1158 MatroskaTrack *track = &tracks[i];
1159 enum CodecID codec_id = CODEC_ID_NONE;
1160 EbmlList *encodings_list = &tracks->encodings;
1161 MatroskaTrackEncoding *encodings = encodings_list->elem;
1162 uint8_t *extradata = NULL;
1163 int extradata_size = 0;
1164 int extradata_offset = 0;
1165 ByteIOContext b;
1166
1167 /* Apply some sanity checks. */
1168 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1169 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1170 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1171 av_log(matroska->ctx, AV_LOG_INFO,
1172 "Unknown or unsupported track type %"PRIu64"\n",
1173 track->type);
1174 continue;
1175 }
1176 if (track->codec_id == NULL)
1177 continue;
1178
1179 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1180 if (!track->default_duration)
1181 track->default_duration = 1000000000/track->video.frame_rate;
1182 if (!track->video.display_width)
1183 track->video.display_width = track->video.pixel_width;
1184 if (!track->video.display_height)
1185 track->video.display_height = track->video.pixel_height;
1186 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1187 if (!track->audio.out_samplerate)
1188 track->audio.out_samplerate = track->audio.samplerate;
1189 }
1190 if (encodings_list->nb_elem > 1) {
1191 av_log(matroska->ctx, AV_LOG_ERROR,
1192 "Multiple combined encodings no supported");
1193 } else if (encodings_list->nb_elem == 1) {
1194 if (encodings[0].type ||
1195 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1196 #if CONFIG_ZLIB
1197 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1198 #endif
1199 #if CONFIG_BZLIB
1200 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1201 #endif
1202 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1203 encodings[0].scope = 0;
1204 av_log(matroska->ctx, AV_LOG_ERROR,
1205 "Unsupported encoding type");
1206 } else if (track->codec_priv.size && encodings[0].scope&2) {
1207 uint8_t *codec_priv = track->codec_priv.data;
1208 int offset = matroska_decode_buffer(&track->codec_priv.data,
1209 &track->codec_priv.size,
1210 track);
1211 if (offset < 0) {
1212 track->codec_priv.data = NULL;
1213 track->codec_priv.size = 0;
1214 av_log(matroska->ctx, AV_LOG_ERROR,
1215 "Failed to decode codec private data\n");
1216 } else if (offset > 0) {
1217 track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1218 memcpy(track->codec_priv.data,
1219 encodings[0].compression.settings.data, offset);
1220 memcpy(track->codec_priv.data+offset, codec_priv,
1221 track->codec_priv.size);
1222 track->codec_priv.size += offset;
1223 }
1224 if (codec_priv != track->codec_priv.data)
1225 av_free(codec_priv);
1226 }
1227 }
1228
1229 for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1230 if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1231 strlen(ff_mkv_codec_tags[j].str))){
1232 codec_id= ff_mkv_codec_tags[j].id;
1233 break;
1234 }
1235 }
1236
1237 st = track->stream = av_new_stream(s, 0);
1238 if (st == NULL)
1239 return AVERROR(ENOMEM);
1240
1241 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1242 && track->codec_priv.size >= 40
1243 && track->codec_priv.data != NULL) {
1244 track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1245 codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1246 } else if (!strcmp(track->codec_id, "A_MS/ACM")
1247 && track->codec_priv.size >= 18
1248 && track->codec_priv.data != NULL) {
1249 init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1250 URL_RDONLY, NULL, NULL, NULL, NULL);
1251 get_wav_header(&b, st->codec, track->codec_priv.size);
1252 codec_id = st->codec->codec_id;
1253 extradata_offset = 18;
1254 track->codec_priv.size -= extradata_offset;
1255 } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1256 && (track->codec_priv.size >= 86)
1257 && (track->codec_priv.data != NULL)) {
1258 track->video.fourcc = AV_RL32(track->codec_priv.data);
1259 codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1260 } else if (codec_id == CODEC_ID_PCM_S16BE) {
1261 switch (track->audio.bitdepth) {
1262 case 8: codec_id = CODEC_ID_PCM_U8; break;
1263 case 24: codec_id = CODEC_ID_PCM_S24BE; break;
1264 case 32: codec_id = CODEC_ID_PCM_S32BE; break;
1265 }
1266 } else if (codec_id == CODEC_ID_PCM_S16LE) {
1267 switch (track->audio.bitdepth) {
1268 case 8: codec_id = CODEC_ID_PCM_U8; break;
1269 case 24: codec_id = CODEC_ID_PCM_S24LE; break;
1270 case 32: codec_id = CODEC_ID_PCM_S32LE; break;
1271 }
1272 } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1273 codec_id = CODEC_ID_PCM_F64LE;
1274 } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1275 int profile = matroska_aac_profile(track->codec_id);
1276 int sri = matroska_aac_sri(track->audio.samplerate);
1277 extradata = av_malloc(5);
1278 if (extradata == NULL)
1279 return AVERROR(ENOMEM);
1280 extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1281 extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1282 if (strstr(track->codec_id, "SBR")) {
1283 sri = matroska_aac_sri(track->audio.out_samplerate);
1284 extradata[2] = 0x56;
1285 extradata[3] = 0xE5;
1286 extradata[4] = 0x80 | (sri<<3);
1287 extradata_size = 5;
1288 } else
1289 extradata_size = 2;
1290 } else if (codec_id == CODEC_ID_TTA) {
1291 extradata_size = 30;
1292 extradata = av_mallocz(extradata_size);
1293 if (extradata == NULL)
1294 return AVERROR(ENOMEM);
1295 init_put_byte(&b, extradata, extradata_size, 1,
1296 NULL, NULL, NULL, NULL);
1297 put_buffer(&b, "TTA1", 4);
1298 put_le16(&b, 1);
1299 put_le16(&b, track->audio.channels);
1300 put_le16(&b, track->audio.bitdepth);
1301 put_le32(&b, track->audio.out_samplerate);
1302 put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1303 } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1304 codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1305 extradata_offset = 26;
1306 track->codec_priv.size -= extradata_offset;
1307 } else if (codec_id == CODEC_ID_RA_144) {
1308 track->audio.out_samplerate = 8000;
1309 track->audio.channels = 1;
1310 } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1311 codec_id == CODEC_ID_ATRAC3) {
1312 init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1313 0, NULL, NULL, NULL, NULL);
1314 url_fskip(&b, 24);
1315 track->audio.coded_framesize = get_be32(&b);
1316 url_fskip(&b, 12);
1317 track->audio.sub_packet_h = get_be16(&b);
1318 track->audio.frame_size = get_be16(&b);
1319 track->audio.sub_packet_size = get_be16(&b);
1320 track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1321 if (codec_id == CODEC_ID_RA_288) {
1322 st->codec->block_align = track->audio.coded_framesize;
1323 track->codec_priv.size = 0;
1324 } else {
1325 st->codec->block_align = track->audio.sub_packet_size;
1326 extradata_offset = 78;
1327 track->codec_priv.size -= extradata_offset;
1328 }
1329 }
1330
1331 if (codec_id == CODEC_ID_NONE)
1332 av_log(matroska->ctx, AV_LOG_INFO,
1333 "Unknown/unsupported CodecID %s.\n", track->codec_id);
1334
1335 if (track->time_scale < 0.01)
1336 track->time_scale = 1.0;
1337 av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1338
1339 st->codec->codec_id = codec_id;
1340 st->start_time = 0;
1341 if (strcmp(track->language, "und"))
1342 av_metadata_set(&st->metadata, "language", track->language);
1343 av_metadata_set(&st->metadata, "description", track->name);
1344
1345 if (track->flag_default)
1346 st->disposition |= AV_DISPOSITION_DEFAULT;
1347
1348 if (track->default_duration)
1349 av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1350 track->default_duration, 1000000000, 30000);
1351
1352 if(extradata){
1353 st->codec->extradata = extradata;
1354 st->codec->extradata_size = extradata_size;
1355 } else if(track->codec_priv.data && track->codec_priv.size > 0){
1356 st->codec->extradata = av_mallocz(track->codec_priv.size +
1357 FF_INPUT_BUFFER_PADDING_SIZE);
1358 if(st->codec->extradata == NULL)
1359 return AVERROR(ENOMEM);
1360 st->codec->extradata_size = track->codec_priv.size;
1361 memcpy(st->codec->extradata,
1362 track->codec_priv.data + extradata_offset,
1363 track->codec_priv.size);
1364 }
1365
1366 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1367 st->codec->codec_type = CODEC_TYPE_VIDEO;
1368 st->codec->codec_tag = track->video.fourcc;
1369 st->codec->width = track->video.pixel_width;
1370 st->codec->height = track->video.pixel_height;
1371 av_reduce(&st->sample_aspect_ratio.num,
1372 &st->sample_aspect_ratio.den,
1373 st->codec->height * track->video.display_width,
1374 st->codec-> width * track->video.display_height,
1375 255);
1376 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1377 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1378 st->codec->codec_type = CODEC_TYPE_AUDIO;
1379 st->codec->sample_rate = track->audio.out_samplerate;
1380 st->codec->channels = track->audio.channels;
1381 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1382 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1383 }
1384 }
1385
1386 attachements = attachements_list->elem;
1387 for (j=0; j<attachements_list->nb_elem; j++) {
1388 if (!(attachements[j].filename && attachements[j].mime &&
1389 attachements[j].bin.data && attachements[j].bin.size > 0)) {
1390 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1391 } else {
1392 AVStream *st = av_new_stream(s, 0);
1393 if (st == NULL)
1394 break;
1395 av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1396 st->codec->codec_id = CODEC_ID_NONE;
1397 st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1398 st->codec->extradata = av_malloc(attachements[j].bin.size);
1399 if(st->codec->extradata == NULL)
1400 break;
1401 st->codec->extradata_size = attachements[j].bin.size;
1402 memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1403
1404 for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1405 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1406 strlen(ff_mkv_mime_tags[i].str))) {
1407 st->codec->codec_id = ff_mkv_mime_tags[i].id;
1408 break;
1409 }
1410 }
1411 attachements[j].stream = st;
1412 }
1413 }
1414
1415 chapters = chapters_list->elem;
1416 for (i=0; i<chapters_list->nb_elem; i++)
1417 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1418 && (max_start==0 || chapters[i].start > max_start)) {
1419 chapters[i].chapter =
1420 ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1421 chapters[i].start, chapters[i].end,
1422 chapters[i].title);
1423 av_metadata_set(&chapters[i].chapter->metadata,
1424 "title", chapters[i].title);
1425 max_start = chapters[i].start;
1426 }
1427
1428 index_list = &matroska->index;
1429 index = index_list->elem;
1430 if (index_list->nb_elem
1431 && index[0].time > 100000000000000/matroska->time_scale) {
1432 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1433 index_scale = matroska->time_scale;
1434 }
1435 for (i=0; i<index_list->nb_elem; i++) {
1436 EbmlList *pos_list = &index[i].pos;
1437 MatroskaIndexPos *pos = pos_list->elem;
1438 for (j=0; j<pos_list->nb_elem; j++) {
1439 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1440 pos[j].track);
1441 if (track && track->stream)
1442 av_add_index_entry(track->stream,
1443 pos[j].pos + matroska->segment_start,
1444 index[i].time/index_scale, 0, 0,
1445 AVINDEX_KEYFRAME);
1446 }
1447 }
1448
1449 matroska_convert_tags(s);
1450
1451 return 0;
1452 }
1453
1454 /*
1455 * Put one packet in an application-supplied AVPacket struct.
1456 * Returns 0 on success or -1 on failure.
1457 */
1458 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1459 AVPacket *pkt)
1460 {
1461 if (matroska->num_packets > 0) {
1462 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1463 av_free(matroska->packets[0]);
1464 if (matroska->num_packets > 1) {
1465 memmove(&matroska->packets[0], &matroska->packets[1],
1466 (matroska->num_packets - 1) * sizeof(AVPacket *));
1467 matroska->packets =
1468 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1469 sizeof(AVPacket *));
1470 } else {
1471 av_freep(&matroska->packets);
1472 }
1473 matroska->num_packets--;
1474 return 0;
1475 }
1476
1477 return -1;
1478 }
1479
1480 /*
1481 * Free all packets in our internal queue.
1482 */
1483 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1484 {
1485 if (matroska->packets) {
1486 int n;
1487 for (n = 0; n < matroska->num_packets; n++) {
1488 av_free_packet(matroska->packets[n]);
1489 av_free(matroska->packets[n]);
1490 }
1491 av_freep(&matroska->packets);
1492 matroska->num_packets = 0;
1493 }
1494 }
1495
1496 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1497 int size, int64_t pos, uint64_t cluster_time,
1498 uint64_t duration, int is_keyframe,
1499 int64_t cluster_pos)
1500 {
1501 uint64_t timecode = AV_NOPTS_VALUE;
1502 MatroskaTrack *track;
1503 int res = 0;
1504 AVStream *st;
1505 AVPacket *pkt;
1506 int16_t block_time;
1507 uint32_t *lace_size = NULL;
1508 int n, flags, laces = 0;
1509 uint64_t num;
1510
1511 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1512 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1513 return res;
1514 }
1515 data += n;
1516 size -= n;
1517
1518 track = matroska_find_track_by_num(matroska, num);
1519 if (size <= 3 || !track || !track->stream) {
1520 av_log(matroska->ctx, AV_LOG_INFO,
1521 "Invalid stream %"PRIu64" or size %u\n", num, size);
1522 return res;
1523 }
1524 st = track->stream;
1525 if (st->discard >= AVDISCARD_ALL)
1526 return res;
1527 if (duration == AV_NOPTS_VALUE)
1528 duration = track->default_duration / matroska->time_scale;
1529
1530 block_time = AV_RB16(data);
1531 data += 2;
1532 flags = *data++;
1533 size -= 3;
1534 if (is_keyframe == -1)
1535 is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1536
1537 if (cluster_time != (uint64_t)-1
1538 && (block_time >= 0 || cluster_time >= -block_time)) {
1539 timecode = cluster_time + block_time;
1540 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1541 && timecode < track->end_timecode)
1542 is_keyframe = 0; /* overlapping subtitles are not key frame */
1543 if (is_keyframe)
1544 av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1545 track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1546 }
1547
1548 if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1549 if (!is_keyframe || timecode < matroska->skip_to_timecode)
1550 return res;
1551 matroska->skip_to_keyframe = 0;
1552 }
1553
1554 switch ((flags & 0x06) >> 1) {
1555 case 0x0: /* no lacing */
1556 laces = 1;
1557 lace_size = av_mallocz(sizeof(int));
1558 lace_size[0] = size;
1559 break;
1560
1561 case 0x1: /* Xiph lacing */
1562 case 0x2: /* fixed-size lacing */
1563 case 0x3: /* EBML lacing */
1564 assert(size>0); // size <=3 is checked before size-=3 above
1565 laces = (*data) + 1;
1566 data += 1;
1567 size -= 1;
1568 lace_size = av_mallocz(laces * sizeof(int));
1569
1570 switch ((flags & 0x06) >> 1) {
1571 case 0x1: /* Xiph lacing */ {
1572 uint8_t temp;
1573 uint32_t total = 0;
1574 for (n = 0; res == 0 && n < laces - 1; n++) {
1575 while (1) {
1576 if (size == 0) {
1577 res = -1;
1578 break;
1579 }
1580 temp = *data;
1581 lace_size[n] += temp;
1582 data += 1;
1583 size -= 1;
1584 if (temp != 0xff)
1585 break;
1586 }
1587 total += lace_size[n];
1588 }
1589 lace_size[n] = size - total;
1590 break;
1591 }
1592
1593 case 0x2: /* fixed-size lacing */
1594 for (n = 0; n < laces; n++)
1595 lace_size[n] = size / laces;
1596 break;
1597
1598 case 0x3: /* EBML lacing */ {
1599 uint32_t total;
1600 n = matroska_ebmlnum_uint(matroska, data, size, &num);
1601 if (n < 0) {
1602 av_log(matroska->ctx, AV_LOG_INFO,
1603 "EBML block data error\n");
1604 break;
1605 }
1606 data += n;
1607 size -= n;
1608 total = lace_size[0] = num;
1609 for (n = 1; res == 0 && n < laces - 1; n++) {
1610 int64_t snum;
1611 int r;
1612 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1613 if (r < 0) {
1614 av_log(matroska->ctx, AV_LOG_INFO,
1615 "EBML block data error\n");
1616 break;
1617 }
1618 data += r;
1619 size -= r;
1620 lace_size[n] = lace_size[n - 1] + snum;
1621 total += lace_size[n];
1622 }
1623 lace_size[n] = size - total;
1624 break;
1625 }
1626 }
1627 break;
1628 }
1629
1630 if (res == 0) {
1631 for (n = 0; n < laces; n++) {
1632 if (st->codec->codec_id == CODEC_ID_RA_288 ||
1633 st->codec->codec_id == CODEC_ID_COOK ||
1634 st->codec->codec_id == CODEC_ID_ATRAC3) {
1635 int a = st->codec->block_align;
1636 int sps = track->audio.sub_packet_size;
1637 int cfs = track->audio.coded_framesize;
1638 int h = track->audio.sub_packet_h;
1639 int y = track->audio.sub_packet_cnt;
1640 int w = track->audio.frame_size;
1641 int x;
1642
1643 if (!track->audio.pkt_cnt) {
1644 if (st->codec->codec_id == CODEC_ID_RA_288)
1645 for (x=0; x<h/2; x++)
1646 memcpy(track->audio.buf+x*2*w+y*cfs,
1647 data+x*cfs, cfs);
1648 else
1649 for (x=0; x<w/sps; x++)
1650 memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1651
1652 if (++track->audio.sub_packet_cnt >= h) {
1653 track->audio.sub_packet_cnt = 0;
1654 track->audio.pkt_cnt = h*w / a;
1655 }
1656 }
1657 while (track->audio.pkt_cnt) {
1658 pkt = av_mallocz(sizeof(AVPacket));
1659 av_new_packet(pkt, a);
1660 memcpy(pkt->data, track->audio.buf
1661 + a * (h*w / a - track->audio.pkt_cnt--), a);
1662 pkt->pos = pos;
1663 pkt->stream_index = st->index;
1664 dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1665 }
1666 } else {
1667 MatroskaTrackEncoding *encodings = track->encodings.elem;
1668 int offset = 0, pkt_size = lace_size[n];
1669 uint8_t *pkt_data = data;
1670
1671 if (encodings && encodings->scope & 1) {
1672 offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1673 if (offset < 0)
1674 continue;
1675 }
1676
1677 pkt = av_mallocz(sizeof(AVPacket));
1678 /* XXX: prevent data copy... */
1679 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1680 av_free(pkt);
1681 res = AVERROR(ENOMEM);
1682 n = laces-1;
1683 break;
1684 }
1685 if (offset)
1686 memcpy (pkt->data, encodings->compression.settings.data, offset);
1687 memcpy (pkt->data+offset, pkt_data, pkt_size);
1688
1689 if (pkt_data != data)
1690 av_free(pkt_data);
1691
1692 if (n == 0)
1693 pkt->flags = is_keyframe;
1694 pkt->stream_index = st->index;
1695
1696 pkt->pts = timecode;
1697 pkt->pos = pos;
1698 if (st->codec->codec_id == CODEC_ID_TEXT)
1699 pkt->convergence_duration = duration;
1700 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1701 pkt->duration = duration;
1702
1703 if (st->codec->codec_id == CODEC_ID_SSA)
1704 matroska_fix_ass_packet(matroska, pkt, duration);
1705
1706 if (matroska->prev_pkt &&
1707 timecode != AV_NOPTS_VALUE &&
1708 matroska->prev_pkt->pts == timecode &&
1709 matroska->prev_pkt->stream_index == st->index)
1710 matroska_merge_packets(matroska->prev_pkt, pkt);
1711 else {
1712 dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1713 matroska->prev_pkt = pkt;
1714 }
1715 }
1716
1717 if (timecode != AV_NOPTS_VALUE)
1718 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1719 data += lace_size[n];
1720 }
1721 }
1722
1723 av_free(lace_size);
1724 return res;
1725 }
1726
1727 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1728 {
1729 MatroskaCluster cluster = { 0 };
1730 EbmlList *blocks_list;
1731 MatroskaBlock *blocks;
1732 int i, res;
1733 int64_t pos = url_ftell(matroska->ctx->pb);
1734 matroska->prev_pkt = NULL;
1735 if (matroska->has_cluster_id){
1736 /* For the first cluster we parse, its ID was already read as
1737 part of matroska_read_header(), so don't read it again */
1738 res = ebml_parse_id(matroska, matroska_clusters,
1739 MATROSKA_ID_CLUSTER, &cluster);
1740 pos -= 4; /* sizeof the ID which was already read */
1741 matroska->has_cluster_id = 0;
1742 } else
1743 res = ebml_parse(matroska, matroska_clusters, &cluster);
1744 blocks_list = &cluster.blocks;
1745 blocks = blocks_list->elem;
1746 for (i=0; i<blocks_list->nb_elem; i++)
1747 if (blocks[i].bin.size > 0)
1748 res=matroska_parse_block(matroska,
1749 blocks[i].bin.data, blocks[i].bin.size,
1750 blocks[i].bin.pos, cluster.timecode,
1751 blocks[i].duration, !blocks[i].reference,
1752 pos);
1753 ebml_free(matroska_cluster, &cluster);
1754 if (res < 0) matroska->done = 1;
1755 return res;
1756 }
1757
1758 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1759 {
1760 MatroskaDemuxContext *matroska = s->priv_data;
1761
1762 while (matroska_deliver_packet(matroska, pkt)) {
1763 if (matroska->done)
1764 return AVERROR_EOF;
1765 matroska_parse_cluster(matroska);
1766 }
1767
1768 return 0;
1769 }
1770
1771 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1772 int64_t timestamp, int flags)
1773 {
1774 MatroskaDemuxContext *matroska = s->priv_data;
1775 MatroskaTrack *tracks = matroska->tracks.elem;
1776 AVStream *st = s->streams[stream_index];
1777 int i, index, index_sub, index_min;
1778
1779 if (!st->nb_index_entries)
1780 return 0;
1781 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1782
1783 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1784 url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1785 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1786 matroska_clear_queue(matroska);
1787 if (matroska_parse_cluster(matroska) < 0)
1788 break;
1789 }
1790 }
1791
1792 matroska_clear_queue(matroska);
1793 if (index < 0)
1794 return 0;
1795
1796 index_min = index;
1797 for (i=0; i < matroska->tracks.nb_elem; i++) {
1798 tracks[i].end_timecode = 0;
1799 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1800 && !tracks[i].stream->discard != AVDISCARD_ALL) {
1801 index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1802 if (index_sub >= 0
1803 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1804 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1805 index_min = index_sub;
1806 }
1807 }
1808
1809 url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1810 matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1811 matroska->skip_to_timecode = st->index_entries[index].timestamp;
1812 matroska->done = 0;
1813 av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1814 return 0;
1815 }
1816
1817 static int matroska_read_close(AVFormatContext *s)
1818 {
1819 MatroskaDemuxContext *matroska = s->priv_data;
1820 MatroskaTrack *tracks = matroska->tracks.elem;
1821 int n;
1822
1823 matroska_clear_queue(matroska);
1824
1825 for (n=0; n < matroska->tracks.nb_elem; n++)
1826 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1827 av_free(tracks[n].audio.buf);
1828 ebml_free(matroska_segment, matroska);
1829
1830 return 0;
1831 }
1832
1833 AVInputFormat matroska_demuxer = {
1834 "matroska",
1835 NULL_IF_CONFIG_SMALL("Matroska file format"),
1836 sizeof(MatroskaDemuxContext),
1837 matroska_probe,
1838 matroska_read_header,
1839 matroska_read_packet,
1840 matroska_read_close,
1841 matroska_read_seek,
1842 .metadata_conv = ff_mkv_metadata_conv,
1843 };
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