handle malloc failures in ff_get_wav_header
[libav.git] / libavformat / matroskadec.c
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
22 /**
23 * @file
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 #include "internal.h"
34 #include "avio_internal.h"
35 /* For ff_codec_get_id(). */
36 #include "riff.h"
37 #include "isom.h"
38 #include "rm.h"
39 #include "matroska.h"
40 #include "libavcodec/mpeg4audio.h"
41 #include "libavutil/intfloat_readwrite.h"
42 #include "libavutil/intreadwrite.h"
43 #include "libavutil/avstring.h"
44 #include "libavutil/lzo.h"
45 #if CONFIG_ZLIB
46 #include <zlib.h>
47 #endif
48 #if CONFIG_BZLIB
49 #include <bzlib.h>
50 #endif
51
52 typedef enum {
53 EBML_NONE,
54 EBML_UINT,
55 EBML_FLOAT,
56 EBML_STR,
57 EBML_UTF8,
58 EBML_BIN,
59 EBML_NEST,
60 EBML_PASS,
61 EBML_STOP,
62 EBML_TYPE_COUNT
63 } EbmlType;
64
65 typedef const struct EbmlSyntax {
66 uint32_t id;
67 EbmlType type;
68 int list_elem_size;
69 int data_offset;
70 union {
71 uint64_t u;
72 double f;
73 const char *s;
74 const struct EbmlSyntax *n;
75 } def;
76 } EbmlSyntax;
77
78 typedef struct {
79 int nb_elem;
80 void *elem;
81 } EbmlList;
82
83 typedef struct {
84 int size;
85 uint8_t *data;
86 int64_t pos;
87 } EbmlBin;
88
89 typedef struct {
90 uint64_t version;
91 uint64_t max_size;
92 uint64_t id_length;
93 char *doctype;
94 uint64_t doctype_version;
95 } Ebml;
96
97 typedef struct {
98 uint64_t algo;
99 EbmlBin settings;
100 } MatroskaTrackCompression;
101
102 typedef struct {
103 uint64_t scope;
104 uint64_t type;
105 MatroskaTrackCompression compression;
106 } MatroskaTrackEncoding;
107
108 typedef struct {
109 double frame_rate;
110 uint64_t display_width;
111 uint64_t display_height;
112 uint64_t pixel_width;
113 uint64_t pixel_height;
114 uint64_t fourcc;
115 } MatroskaTrackVideo;
116
117 typedef struct {
118 double samplerate;
119 double out_samplerate;
120 uint64_t bitdepth;
121 uint64_t channels;
122
123 /* real audio header (extracted from extradata) */
124 int coded_framesize;
125 int sub_packet_h;
126 int frame_size;
127 int sub_packet_size;
128 int sub_packet_cnt;
129 int pkt_cnt;
130 uint8_t *buf;
131 } MatroskaTrackAudio;
132
133 typedef struct {
134 uint64_t num;
135 uint64_t uid;
136 uint64_t type;
137 char *name;
138 char *codec_id;
139 EbmlBin codec_priv;
140 char *language;
141 double time_scale;
142 uint64_t default_duration;
143 uint64_t flag_default;
144 uint64_t flag_forced;
145 MatroskaTrackVideo video;
146 MatroskaTrackAudio audio;
147 EbmlList encodings;
148
149 AVStream *stream;
150 int64_t end_timecode;
151 int ms_compat;
152 } MatroskaTrack;
153
154 typedef struct {
155 uint64_t uid;
156 char *filename;
157 char *mime;
158 EbmlBin bin;
159
160 AVStream *stream;
161 } MatroskaAttachement;
162
163 typedef struct {
164 uint64_t start;
165 uint64_t end;
166 uint64_t uid;
167 char *title;
168
169 AVChapter *chapter;
170 } MatroskaChapter;
171
172 typedef struct {
173 uint64_t track;
174 uint64_t pos;
175 } MatroskaIndexPos;
176
177 typedef struct {
178 uint64_t time;
179 EbmlList pos;
180 } MatroskaIndex;
181
182 typedef struct {
183 char *name;
184 char *string;
185 char *lang;
186 uint64_t def;
187 EbmlList sub;
188 } MatroskaTag;
189
190 typedef struct {
191 char *type;
192 uint64_t typevalue;
193 uint64_t trackuid;
194 uint64_t chapteruid;
195 uint64_t attachuid;
196 } MatroskaTagTarget;
197
198 typedef struct {
199 MatroskaTagTarget target;
200 EbmlList tag;
201 } MatroskaTags;
202
203 typedef struct {
204 uint64_t id;
205 uint64_t pos;
206 } MatroskaSeekhead;
207
208 typedef struct {
209 uint64_t start;
210 uint64_t length;
211 } MatroskaLevel;
212
213 typedef struct {
214 AVFormatContext *ctx;
215
216 /* EBML stuff */
217 int num_levels;
218 MatroskaLevel levels[EBML_MAX_DEPTH];
219 int level_up;
220 uint32_t current_id;
221
222 uint64_t time_scale;
223 double duration;
224 char *title;
225 EbmlList tracks;
226 EbmlList attachments;
227 EbmlList chapters;
228 EbmlList index;
229 EbmlList tags;
230 EbmlList seekhead;
231
232 /* byte position of the segment inside the stream */
233 int64_t segment_start;
234
235 /* the packet queue */
236 AVPacket **packets;
237 int num_packets;
238 AVPacket *prev_pkt;
239
240 int done;
241
242 /* What to skip before effectively reading a packet. */
243 int skip_to_keyframe;
244 uint64_t skip_to_timecode;
245 } MatroskaDemuxContext;
246
247 typedef struct {
248 uint64_t duration;
249 int64_t reference;
250 uint64_t non_simple;
251 EbmlBin bin;
252 } MatroskaBlock;
253
254 typedef struct {
255 uint64_t timecode;
256 EbmlList blocks;
257 } MatroskaCluster;
258
259 static EbmlSyntax ebml_header[] = {
260 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
261 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
262 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
263 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
264 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
265 { EBML_ID_EBMLVERSION, EBML_NONE },
266 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
267 { 0 }
268 };
269
270 static EbmlSyntax ebml_syntax[] = {
271 { EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
272 { 0 }
273 };
274
275 static EbmlSyntax matroska_info[] = {
276 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
277 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
278 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
279 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
280 { MATROSKA_ID_MUXINGAPP, EBML_NONE },
281 { MATROSKA_ID_DATEUTC, EBML_NONE },
282 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
283 { 0 }
284 };
285
286 static EbmlSyntax matroska_track_video[] = {
287 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
288 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
289 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
290 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
291 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
292 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
293 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
294 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
295 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
296 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
297 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
298 { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
299 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
300 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
301 { 0 }
302 };
303
304 static EbmlSyntax matroska_track_audio[] = {
305 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
306 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
307 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
308 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
309 { 0 }
310 };
311
312 static EbmlSyntax matroska_track_encoding_compression[] = {
313 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
314 { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
315 { 0 }
316 };
317
318 static EbmlSyntax matroska_track_encoding[] = {
319 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
320 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
321 { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
322 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
323 { 0 }
324 };
325
326 static EbmlSyntax matroska_track_encodings[] = {
327 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
328 { 0 }
329 };
330
331 static EbmlSyntax matroska_track[] = {
332 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
333 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
334 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
335 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
336 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
337 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
338 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
339 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
340 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
341 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
342 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
343 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
344 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
345 { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
346 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
347 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
348 { MATROSKA_ID_CODECNAME, EBML_NONE },
349 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
350 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
351 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
352 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
353 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
354 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_NONE },
355 { 0 }
356 };
357
358 static EbmlSyntax matroska_tracks[] = {
359 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
360 { 0 }
361 };
362
363 static EbmlSyntax matroska_attachment[] = {
364 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
365 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
366 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
367 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
368 { MATROSKA_ID_FILEDESC, EBML_NONE },
369 { 0 }
370 };
371
372 static EbmlSyntax matroska_attachments[] = {
373 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
374 { 0 }
375 };
376
377 static EbmlSyntax matroska_chapter_display[] = {
378 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
379 { MATROSKA_ID_CHAPLANG, EBML_NONE },
380 { 0 }
381 };
382
383 static EbmlSyntax matroska_chapter_entry[] = {
384 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
385 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
386 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
387 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
388 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
389 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
390 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
391 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
392 { 0 }
393 };
394
395 static EbmlSyntax matroska_chapter[] = {
396 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
397 { MATROSKA_ID_EDITIONUID, EBML_NONE },
398 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
399 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
400 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
401 { 0 }
402 };
403
404 static EbmlSyntax matroska_chapters[] = {
405 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
406 { 0 }
407 };
408
409 static EbmlSyntax matroska_index_pos[] = {
410 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
411 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
412 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
413 { 0 }
414 };
415
416 static EbmlSyntax matroska_index_entry[] = {
417 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
418 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
419 { 0 }
420 };
421
422 static EbmlSyntax matroska_index[] = {
423 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
424 { 0 }
425 };
426
427 static EbmlSyntax matroska_simpletag[] = {
428 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag,name) },
429 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag,string) },
430 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag,lang), {.s="und"} },
431 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag,def) },
432 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag,def) },
433 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
434 { 0 }
435 };
436
437 static EbmlSyntax matroska_tagtargets[] = {
438 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget,type) },
439 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
440 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
441 { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
442 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
443 { 0 }
444 };
445
446 static EbmlSyntax matroska_tag[] = {
447 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
448 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
449 { 0 }
450 };
451
452 static EbmlSyntax matroska_tags[] = {
453 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
454 { 0 }
455 };
456
457 static EbmlSyntax matroska_seekhead_entry[] = {
458 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
459 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
460 { 0 }
461 };
462
463 static EbmlSyntax matroska_seekhead[] = {
464 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
465 { 0 }
466 };
467
468 static EbmlSyntax matroska_segment[] = {
469 { MATROSKA_ID_INFO, EBML_NEST, 0, 0, {.n=matroska_info } },
470 { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, {.n=matroska_tracks } },
471 { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, {.n=matroska_attachments} },
472 { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, {.n=matroska_chapters } },
473 { MATROSKA_ID_CUES, EBML_NEST, 0, 0, {.n=matroska_index } },
474 { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, {.n=matroska_tags } },
475 { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, {.n=matroska_seekhead } },
476 { MATROSKA_ID_CLUSTER, EBML_STOP },
477 { 0 }
478 };
479
480 static EbmlSyntax matroska_segments[] = {
481 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, {.n=matroska_segment } },
482 { 0 }
483 };
484
485 static EbmlSyntax matroska_blockgroup[] = {
486 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
487 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock,bin) },
488 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
489 { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
490 { 1, EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
491 { 0 }
492 };
493
494 static EbmlSyntax matroska_cluster[] = {
495 { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
496 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
497 { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
498 { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
499 { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
500 { 0 }
501 };
502
503 static EbmlSyntax matroska_clusters[] = {
504 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, {.n=matroska_cluster} },
505 { MATROSKA_ID_INFO, EBML_NONE },
506 { MATROSKA_ID_CUES, EBML_NONE },
507 { MATROSKA_ID_TAGS, EBML_NONE },
508 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
509 { 0 }
510 };
511
512 static const char *matroska_doctypes[] = { "matroska", "webm" };
513
514 /*
515 * Return: Whether we reached the end of a level in the hierarchy or not.
516 */
517 static int ebml_level_end(MatroskaDemuxContext *matroska)
518 {
519 AVIOContext *pb = matroska->ctx->pb;
520 int64_t pos = avio_tell(pb);
521
522 if (matroska->num_levels > 0) {
523 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
524 if (pos - level->start >= level->length || matroska->current_id) {
525 matroska->num_levels--;
526 return 1;
527 }
528 }
529 return 0;
530 }
531
532 /*
533 * Read: an "EBML number", which is defined as a variable-length
534 * array of bytes. The first byte indicates the length by giving a
535 * number of 0-bits followed by a one. The position of the first
536 * "one" bit inside the first byte indicates the length of this
537 * number.
538 * Returns: number of bytes read, < 0 on error
539 */
540 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
541 int max_size, uint64_t *number)
542 {
543 int read = 1, n = 1;
544 uint64_t total = 0;
545
546 /* The first byte tells us the length in bytes - avio_r8() can normally
547 * return 0, but since that's not a valid first ebmlID byte, we can
548 * use it safely here to catch EOS. */
549 if (!(total = avio_r8(pb))) {
550 /* we might encounter EOS here */
551 if (!pb->eof_reached) {
552 int64_t pos = avio_tell(pb);
553 av_log(matroska->ctx, AV_LOG_ERROR,
554 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
555 pos, pos);
556 }
557 return AVERROR(EIO); /* EOS or actual I/O error */
558 }
559
560 /* get the length of the EBML number */
561 read = 8 - ff_log2_tab[total];
562 if (read > max_size) {
563 int64_t pos = avio_tell(pb) - 1;
564 av_log(matroska->ctx, AV_LOG_ERROR,
565 "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
566 (uint8_t) total, pos, pos);
567 return AVERROR_INVALIDDATA;
568 }
569
570 /* read out length */
571 total ^= 1 << ff_log2_tab[total];
572 while (n++ < read)
573 total = (total << 8) | avio_r8(pb);
574
575 *number = total;
576
577 return read;
578 }
579
580 /**
581 * Read a EBML length value.
582 * This needs special handling for the "unknown length" case which has multiple
583 * encodings.
584 */
585 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
586 uint64_t *number)
587 {
588 int res = ebml_read_num(matroska, pb, 8, number);
589 if (res > 0 && *number + 1 == 1ULL << (7 * res))
590 *number = 0xffffffffffffffULL;
591 return res;
592 }
593
594 /*
595 * Read the next element as an unsigned int.
596 * 0 is success, < 0 is failure.
597 */
598 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
599 {
600 int n = 0;
601
602 if (size > 8)
603 return AVERROR_INVALIDDATA;
604
605 /* big-endian ordering; build up number */
606 *num = 0;
607 while (n++ < size)
608 *num = (*num << 8) | avio_r8(pb);
609
610 return 0;
611 }
612
613 /*
614 * Read the next element as a float.
615 * 0 is success, < 0 is failure.
616 */
617 static int ebml_read_float(AVIOContext *pb, int size, double *num)
618 {
619 if (size == 0) {
620 *num = 0;
621 } else if (size == 4) {
622 *num= av_int2flt(avio_rb32(pb));
623 } else if(size==8){
624 *num= av_int2dbl(avio_rb64(pb));
625 } else
626 return AVERROR_INVALIDDATA;
627
628 return 0;
629 }
630
631 /*
632 * Read the next element as an ASCII string.
633 * 0 is success, < 0 is failure.
634 */
635 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
636 {
637 av_free(*str);
638 /* EBML strings are usually not 0-terminated, so we allocate one
639 * byte more, read the string and NULL-terminate it ourselves. */
640 if (!(*str = av_malloc(size + 1)))
641 return AVERROR(ENOMEM);
642 if (avio_read(pb, (uint8_t *) *str, size) != size) {
643 av_freep(str);
644 return AVERROR(EIO);
645 }
646 (*str)[size] = '\0';
647
648 return 0;
649 }
650
651 /*
652 * Read the next element as binary data.
653 * 0 is success, < 0 is failure.
654 */
655 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
656 {
657 av_free(bin->data);
658 if (!(bin->data = av_malloc(length)))
659 return AVERROR(ENOMEM);
660
661 bin->size = length;
662 bin->pos = avio_tell(pb);
663 if (avio_read(pb, bin->data, length) != length) {
664 av_freep(&bin->data);
665 return AVERROR(EIO);
666 }
667
668 return 0;
669 }
670
671 /*
672 * Read the next element, but only the header. The contents
673 * are supposed to be sub-elements which can be read separately.
674 * 0 is success, < 0 is failure.
675 */
676 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
677 {
678 AVIOContext *pb = matroska->ctx->pb;
679 MatroskaLevel *level;
680
681 if (matroska->num_levels >= EBML_MAX_DEPTH) {
682 av_log(matroska->ctx, AV_LOG_ERROR,
683 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
684 return AVERROR(ENOSYS);
685 }
686
687 level = &matroska->levels[matroska->num_levels++];
688 level->start = avio_tell(pb);
689 level->length = length;
690
691 return 0;
692 }
693
694 /*
695 * Read signed/unsigned "EBML" numbers.
696 * Return: number of bytes processed, < 0 on error
697 */
698 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
699 uint8_t *data, uint32_t size, uint64_t *num)
700 {
701 AVIOContext pb;
702 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
703 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
704 }
705
706 /*
707 * Same as above, but signed.
708 */
709 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
710 uint8_t *data, uint32_t size, int64_t *num)
711 {
712 uint64_t unum;
713 int res;
714
715 /* read as unsigned number first */
716 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
717 return res;
718
719 /* make signed (weird way) */
720 *num = unum - ((1LL << (7*res - 1)) - 1);
721
722 return res;
723 }
724
725 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
726 EbmlSyntax *syntax, void *data);
727
728 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
729 uint32_t id, void *data)
730 {
731 int i;
732 for (i=0; syntax[i].id; i++)
733 if (id == syntax[i].id)
734 break;
735 if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
736 matroska->num_levels > 0 &&
737 matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
738 return 0; // we reached the end of an unknown size cluster
739 if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
740 av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
741 return ebml_parse_elem(matroska, &syntax[i], data);
742 }
743
744 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
745 void *data)
746 {
747 if (!matroska->current_id) {
748 uint64_t id;
749 int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
750 if (res < 0)
751 return res;
752 matroska->current_id = id | 1 << 7*res;
753 }
754 return ebml_parse_id(matroska, syntax, matroska->current_id, data);
755 }
756
757 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
758 void *data)
759 {
760 int i, res = 0;
761
762 for (i=0; syntax[i].id; i++)
763 switch (syntax[i].type) {
764 case EBML_UINT:
765 *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
766 break;
767 case EBML_FLOAT:
768 *(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
769 break;
770 case EBML_STR:
771 case EBML_UTF8:
772 *(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
773 break;
774 }
775
776 while (!res && !ebml_level_end(matroska))
777 res = ebml_parse(matroska, syntax, data);
778
779 return res;
780 }
781
782 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
783 EbmlSyntax *syntax, void *data)
784 {
785 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
786 [EBML_UINT] = 8,
787 [EBML_FLOAT] = 8,
788 // max. 16 MB for strings
789 [EBML_STR] = 0x1000000,
790 [EBML_UTF8] = 0x1000000,
791 // max. 256 MB for binary data
792 [EBML_BIN] = 0x10000000,
793 // no limits for anything else
794 };
795 AVIOContext *pb = matroska->ctx->pb;
796 uint32_t id = syntax->id;
797 uint64_t length;
798 int res;
799
800 data = (char *)data + syntax->data_offset;
801 if (syntax->list_elem_size) {
802 EbmlList *list = data;
803 list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
804 data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
805 memset(data, 0, syntax->list_elem_size);
806 list->nb_elem++;
807 }
808
809 if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
810 matroska->current_id = 0;
811 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
812 return res;
813 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
814 av_log(matroska->ctx, AV_LOG_ERROR,
815 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
816 length, max_lengths[syntax->type], syntax->type);
817 return AVERROR_INVALIDDATA;
818 }
819 }
820
821 switch (syntax->type) {
822 case EBML_UINT: res = ebml_read_uint (pb, length, data); break;
823 case EBML_FLOAT: res = ebml_read_float (pb, length, data); break;
824 case EBML_STR:
825 case EBML_UTF8: res = ebml_read_ascii (pb, length, data); break;
826 case EBML_BIN: res = ebml_read_binary(pb, length, data); break;
827 case EBML_NEST: if ((res=ebml_read_master(matroska, length)) < 0)
828 return res;
829 if (id == MATROSKA_ID_SEGMENT)
830 matroska->segment_start = avio_tell(matroska->ctx->pb);
831 return ebml_parse_nest(matroska, syntax->def.n, data);
832 case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data);
833 case EBML_STOP: return 1;
834 default: return avio_skip(pb,length)<0 ? AVERROR(EIO) : 0;
835 }
836 if (res == AVERROR_INVALIDDATA)
837 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
838 else if (res == AVERROR(EIO))
839 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
840 return res;
841 }
842
843 static void ebml_free(EbmlSyntax *syntax, void *data)
844 {
845 int i, j;
846 for (i=0; syntax[i].id; i++) {
847 void *data_off = (char *)data + syntax[i].data_offset;
848 switch (syntax[i].type) {
849 case EBML_STR:
850 case EBML_UTF8: av_freep(data_off); break;
851 case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
852 case EBML_NEST:
853 if (syntax[i].list_elem_size) {
854 EbmlList *list = data_off;
855 char *ptr = list->elem;
856 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
857 ebml_free(syntax[i].def.n, ptr);
858 av_free(list->elem);
859 } else
860 ebml_free(syntax[i].def.n, data_off);
861 default: break;
862 }
863 }
864 }
865
866
867 /*
868 * Autodetecting...
869 */
870 static int matroska_probe(AVProbeData *p)
871 {
872 uint64_t total = 0;
873 int len_mask = 0x80, size = 1, n = 1, i;
874
875 /* EBML header? */
876 if (AV_RB32(p->buf) != EBML_ID_HEADER)
877 return 0;
878
879 /* length of header */
880 total = p->buf[4];
881 while (size <= 8 && !(total & len_mask)) {
882 size++;
883 len_mask >>= 1;
884 }
885 if (size > 8)
886 return 0;
887 total &= (len_mask - 1);
888 while (n < size)
889 total = (total << 8) | p->buf[4 + n++];
890
891 /* Does the probe data contain the whole header? */
892 if (p->buf_size < 4 + size + total)
893 return 0;
894
895 /* The header should contain a known document type. For now,
896 * we don't parse the whole header but simply check for the
897 * availability of that array of characters inside the header.
898 * Not fully fool-proof, but good enough. */
899 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
900 int probelen = strlen(matroska_doctypes[i]);
901 for (n = 4+size; n <= 4+size+total-probelen; n++)
902 if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
903 return AVPROBE_SCORE_MAX;
904 }
905
906 // probably valid EBML header but no recognized doctype
907 return AVPROBE_SCORE_MAX/2;
908 }
909
910 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
911 int num)
912 {
913 MatroskaTrack *tracks = matroska->tracks.elem;
914 int i;
915
916 for (i=0; i < matroska->tracks.nb_elem; i++)
917 if (tracks[i].num == num)
918 return &tracks[i];
919
920 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
921 return NULL;
922 }
923
924 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
925 MatroskaTrack *track)
926 {
927 MatroskaTrackEncoding *encodings = track->encodings.elem;
928 uint8_t* data = *buf;
929 int isize = *buf_size;
930 uint8_t* pkt_data = NULL;
931 int pkt_size = isize;
932 int result = 0;
933 int olen;
934
935 if (pkt_size >= 10000000)
936 return -1;
937
938 switch (encodings[0].compression.algo) {
939 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
940 return encodings[0].compression.settings.size;
941 case MATROSKA_TRACK_ENCODING_COMP_LZO:
942 do {
943 olen = pkt_size *= 3;
944 pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
945 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
946 } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
947 if (result)
948 goto failed;
949 pkt_size -= olen;
950 break;
951 #if CONFIG_ZLIB
952 case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
953 z_stream zstream = {0};
954 if (inflateInit(&zstream) != Z_OK)
955 return -1;
956 zstream.next_in = data;
957 zstream.avail_in = isize;
958 do {
959 pkt_size *= 3;
960 pkt_data = av_realloc(pkt_data, pkt_size);
961 zstream.avail_out = pkt_size - zstream.total_out;
962 zstream.next_out = pkt_data + zstream.total_out;
963 result = inflate(&zstream, Z_NO_FLUSH);
964 } while (result==Z_OK && pkt_size<10000000);
965 pkt_size = zstream.total_out;
966 inflateEnd(&zstream);
967 if (result != Z_STREAM_END)
968 goto failed;
969 break;
970 }
971 #endif
972 #if CONFIG_BZLIB
973 case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
974 bz_stream bzstream = {0};
975 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
976 return -1;
977 bzstream.next_in = data;
978 bzstream.avail_in = isize;
979 do {
980 pkt_size *= 3;
981 pkt_data = av_realloc(pkt_data, pkt_size);
982 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
983 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
984 result = BZ2_bzDecompress(&bzstream);
985 } while (result==BZ_OK && pkt_size<10000000);
986 pkt_size = bzstream.total_out_lo32;
987 BZ2_bzDecompressEnd(&bzstream);
988 if (result != BZ_STREAM_END)
989 goto failed;
990 break;
991 }
992 #endif
993 default:
994 return -1;
995 }
996
997 *buf = pkt_data;
998 *buf_size = pkt_size;
999 return 0;
1000 failed:
1001 av_free(pkt_data);
1002 return -1;
1003 }
1004
1005 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1006 AVPacket *pkt, uint64_t display_duration)
1007 {
1008 char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
1009 for (; *ptr!=',' && ptr<end-1; ptr++);
1010 if (*ptr == ',')
1011 layer = ++ptr;
1012 for (; *ptr!=',' && ptr<end-1; ptr++);
1013 if (*ptr == ',') {
1014 int64_t end_pts = pkt->pts + display_duration;
1015 int sc = matroska->time_scale * pkt->pts / 10000000;
1016 int ec = matroska->time_scale * end_pts / 10000000;
1017 int sh, sm, ss, eh, em, es, len;
1018 sh = sc/360000; sc -= 360000*sh;
1019 sm = sc/ 6000; sc -= 6000*sm;
1020 ss = sc/ 100; sc -= 100*ss;
1021 eh = ec/360000; ec -= 360000*eh;
1022 em = ec/ 6000; ec -= 6000*em;
1023 es = ec/ 100; ec -= 100*es;
1024 *ptr++ = '\0';
1025 len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1026 if (!(line = av_malloc(len)))
1027 return;
1028 snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1029 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1030 av_free(pkt->data);
1031 pkt->data = line;
1032 pkt->size = strlen(line);
1033 }
1034 }
1035
1036 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
1037 {
1038 out->data = av_realloc(out->data, out->size+in->size);
1039 memcpy(out->data+out->size, in->data, in->size);
1040 out->size += in->size;
1041 av_destruct_packet(in);
1042 av_free(in);
1043 }
1044
1045 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1046 AVMetadata **metadata, char *prefix)
1047 {
1048 MatroskaTag *tags = list->elem;
1049 char key[1024];
1050 int i;
1051
1052 for (i=0; i < list->nb_elem; i++) {
1053 const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1054
1055 if (!tags[i].name) {
1056 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1057 continue;
1058 }
1059 if (prefix) snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1060 else av_strlcpy(key, tags[i].name, sizeof(key));
1061 if (tags[i].def || !lang) {
1062 av_metadata_set2(metadata, key, tags[i].string, 0);
1063 if (tags[i].sub.nb_elem)
1064 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1065 }
1066 if (lang) {
1067 av_strlcat(key, "-", sizeof(key));
1068 av_strlcat(key, lang, sizeof(key));
1069 av_metadata_set2(metadata, key, tags[i].string, 0);
1070 if (tags[i].sub.nb_elem)
1071 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1072 }
1073 }
1074 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1075 }
1076
1077 static void matroska_convert_tags(AVFormatContext *s)
1078 {
1079 MatroskaDemuxContext *matroska = s->priv_data;
1080 MatroskaTags *tags = matroska->tags.elem;
1081 int i, j;
1082
1083 for (i=0; i < matroska->tags.nb_elem; i++) {
1084 if (tags[i].target.attachuid) {
1085 MatroskaAttachement *attachment = matroska->attachments.elem;
1086 for (j=0; j<matroska->attachments.nb_elem; j++)
1087 if (attachment[j].uid == tags[i].target.attachuid)
1088 matroska_convert_tag(s, &tags[i].tag,
1089 &attachment[j].stream->metadata, NULL);
1090 } else if (tags[i].target.chapteruid) {
1091 MatroskaChapter *chapter = matroska->chapters.elem;
1092 for (j=0; j<matroska->chapters.nb_elem; j++)
1093 if (chapter[j].uid == tags[i].target.chapteruid)
1094 matroska_convert_tag(s, &tags[i].tag,
1095 &chapter[j].chapter->metadata, NULL);
1096 } else if (tags[i].target.trackuid) {
1097 MatroskaTrack *track = matroska->tracks.elem;
1098 for (j=0; j<matroska->tracks.nb_elem; j++)
1099 if (track[j].uid == tags[i].target.trackuid)
1100 matroska_convert_tag(s, &tags[i].tag,
1101 &track[j].stream->metadata, NULL);
1102 } else {
1103 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1104 tags[i].target.type);
1105 }
1106 }
1107 }
1108
1109 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1110 {
1111 EbmlList *seekhead_list = &matroska->seekhead;
1112 MatroskaSeekhead *seekhead = seekhead_list->elem;
1113 uint32_t level_up = matroska->level_up;
1114 int64_t before_pos = avio_tell(matroska->ctx->pb);
1115 uint32_t saved_id = matroska->current_id;
1116 MatroskaLevel level;
1117 int i;
1118
1119 // we should not do any seeking in the streaming case
1120 if (!matroska->ctx->pb->seekable ||
1121 (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1122 return;
1123
1124 for (i=0; i<seekhead_list->nb_elem; i++) {
1125 int64_t offset = seekhead[i].pos + matroska->segment_start;
1126
1127 if (seekhead[i].pos <= before_pos
1128 || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1129 || seekhead[i].id == MATROSKA_ID_CLUSTER)
1130 continue;
1131
1132 /* seek */
1133 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1134 continue;
1135
1136 /* We don't want to lose our seekhead level, so we add
1137 * a dummy. This is a crude hack. */
1138 if (matroska->num_levels == EBML_MAX_DEPTH) {
1139 av_log(matroska->ctx, AV_LOG_INFO,
1140 "Max EBML element depth (%d) reached, "
1141 "cannot parse further.\n", EBML_MAX_DEPTH);
1142 break;
1143 }
1144
1145 level.start = 0;
1146 level.length = (uint64_t)-1;
1147 matroska->levels[matroska->num_levels] = level;
1148 matroska->num_levels++;
1149 matroska->current_id = 0;
1150
1151 ebml_parse(matroska, matroska_segment, matroska);
1152
1153 /* remove dummy level */
1154 while (matroska->num_levels) {
1155 uint64_t length = matroska->levels[--matroska->num_levels].length;
1156 if (length == (uint64_t)-1)
1157 break;
1158 }
1159 }
1160
1161 /* seek back */
1162 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1163 matroska->level_up = level_up;
1164 matroska->current_id = saved_id;
1165 }
1166
1167 static int matroska_aac_profile(char *codec_id)
1168 {
1169 static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1170 int profile;
1171
1172 for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1173 if (strstr(codec_id, aac_profiles[profile]))
1174 break;
1175 return profile + 1;
1176 }
1177
1178 static int matroska_aac_sri(int samplerate)
1179 {
1180 int sri;
1181
1182 for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1183 if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1184 break;
1185 return sri;
1186 }
1187
1188 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1189 {
1190 MatroskaDemuxContext *matroska = s->priv_data;
1191 EbmlList *attachements_list = &matroska->attachments;
1192 MatroskaAttachement *attachements;
1193 EbmlList *chapters_list = &matroska->chapters;
1194 MatroskaChapter *chapters;
1195 MatroskaTrack *tracks;
1196 EbmlList *index_list;
1197 MatroskaIndex *index;
1198 int index_scale = 1;
1199 uint64_t max_start = 0;
1200 Ebml ebml = { 0 };
1201 AVStream *st;
1202 int i, j, res;
1203
1204 matroska->ctx = s;
1205
1206 /* First read the EBML header. */
1207 if (ebml_parse(matroska, ebml_syntax, &ebml)
1208 || ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
1209 || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1210 av_log(matroska->ctx, AV_LOG_ERROR,
1211 "EBML header using unsupported features\n"
1212 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1213 ebml.version, ebml.doctype, ebml.doctype_version);
1214 ebml_free(ebml_syntax, &ebml);
1215 return AVERROR_PATCHWELCOME;
1216 }
1217 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1218 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1219 break;
1220 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1221 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1222 }
1223 ebml_free(ebml_syntax, &ebml);
1224
1225 /* The next thing is a segment. */
1226 if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1227 return res;
1228 matroska_execute_seekhead(matroska);
1229
1230 if (!matroska->time_scale)
1231 matroska->time_scale = 1000000;
1232 if (matroska->duration)
1233 matroska->ctx->duration = matroska->duration * matroska->time_scale
1234 * 1000 / AV_TIME_BASE;
1235 av_metadata_set2(&s->metadata, "title", matroska->title, 0);
1236
1237 tracks = matroska->tracks.elem;
1238 for (i=0; i < matroska->tracks.nb_elem; i++) {
1239 MatroskaTrack *track = &tracks[i];
1240 enum CodecID codec_id = CODEC_ID_NONE;
1241 EbmlList *encodings_list = &tracks->encodings;
1242 MatroskaTrackEncoding *encodings = encodings_list->elem;
1243 uint8_t *extradata = NULL;
1244 int extradata_size = 0;
1245 int extradata_offset = 0;
1246 AVIOContext b;
1247
1248 /* Apply some sanity checks. */
1249 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1250 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1251 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1252 av_log(matroska->ctx, AV_LOG_INFO,
1253 "Unknown or unsupported track type %"PRIu64"\n",
1254 track->type);
1255 continue;
1256 }
1257 if (track->codec_id == NULL)
1258 continue;
1259
1260 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1261 if (!track->default_duration)
1262 track->default_duration = 1000000000/track->video.frame_rate;
1263 if (!track->video.display_width)
1264 track->video.display_width = track->video.pixel_width;
1265 if (!track->video.display_height)
1266 track->video.display_height = track->video.pixel_height;
1267 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1268 if (!track->audio.out_samplerate)
1269 track->audio.out_samplerate = track->audio.samplerate;
1270 }
1271 if (encodings_list->nb_elem > 1) {
1272 av_log(matroska->ctx, AV_LOG_ERROR,
1273 "Multiple combined encodings no supported");
1274 } else if (encodings_list->nb_elem == 1) {
1275 if (encodings[0].type ||
1276 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1277 #if CONFIG_ZLIB
1278 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1279 #endif
1280 #if CONFIG_BZLIB
1281 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1282 #endif
1283 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1284 encodings[0].scope = 0;
1285 av_log(matroska->ctx, AV_LOG_ERROR,
1286 "Unsupported encoding type");
1287 } else if (track->codec_priv.size && encodings[0].scope&2) {
1288 uint8_t *codec_priv = track->codec_priv.data;
1289 int offset = matroska_decode_buffer(&track->codec_priv.data,
1290 &track->codec_priv.size,
1291 track);
1292 if (offset < 0) {
1293 track->codec_priv.data = NULL;
1294 track->codec_priv.size = 0;
1295 av_log(matroska->ctx, AV_LOG_ERROR,
1296 "Failed to decode codec private data\n");
1297 } else if (offset > 0) {
1298 track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1299 memcpy(track->codec_priv.data,
1300 encodings[0].compression.settings.data, offset);
1301 memcpy(track->codec_priv.data+offset, codec_priv,
1302 track->codec_priv.size);
1303 track->codec_priv.size += offset;
1304 }
1305 if (codec_priv != track->codec_priv.data)
1306 av_free(codec_priv);
1307 }
1308 }
1309
1310 for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1311 if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1312 strlen(ff_mkv_codec_tags[j].str))){
1313 codec_id= ff_mkv_codec_tags[j].id;
1314 break;
1315 }
1316 }
1317
1318 st = track->stream = av_new_stream(s, 0);
1319 if (st == NULL)
1320 return AVERROR(ENOMEM);
1321
1322 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1323 && track->codec_priv.size >= 40
1324 && track->codec_priv.data != NULL) {
1325 track->ms_compat = 1;
1326 track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1327 codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1328 extradata_offset = 40;
1329 } else if (!strcmp(track->codec_id, "A_MS/ACM")
1330 && track->codec_priv.size >= 14
1331 && track->codec_priv.data != NULL) {
1332 int ret;
1333 ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
1334 AVIO_RDONLY, NULL, NULL, NULL, NULL);
1335 ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1336 if (ret < 0)
1337 return ret;
1338 codec_id = st->codec->codec_id;
1339 extradata_offset = FFMIN(track->codec_priv.size, 18);
1340 } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1341 && (track->codec_priv.size >= 86)
1342 && (track->codec_priv.data != NULL)) {
1343 track->video.fourcc = AV_RL32(track->codec_priv.data);
1344 codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1345 } else if (codec_id == CODEC_ID_PCM_S16BE) {
1346 switch (track->audio.bitdepth) {
1347 case 8: codec_id = CODEC_ID_PCM_U8; break;
1348 case 24: codec_id = CODEC_ID_PCM_S24BE; break;
1349 case 32: codec_id = CODEC_ID_PCM_S32BE; break;
1350 }
1351 } else if (codec_id == CODEC_ID_PCM_S16LE) {
1352 switch (track->audio.bitdepth) {
1353 case 8: codec_id = CODEC_ID_PCM_U8; break;
1354 case 24: codec_id = CODEC_ID_PCM_S24LE; break;
1355 case 32: codec_id = CODEC_ID_PCM_S32LE; break;
1356 }
1357 } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1358 codec_id = CODEC_ID_PCM_F64LE;
1359 } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1360 int profile = matroska_aac_profile(track->codec_id);
1361 int sri = matroska_aac_sri(track->audio.samplerate);
1362 extradata = av_malloc(5);
1363 if (extradata == NULL)
1364 return AVERROR(ENOMEM);
1365 extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1366 extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1367 if (strstr(track->codec_id, "SBR")) {
1368 sri = matroska_aac_sri(track->audio.out_samplerate);
1369 extradata[2] = 0x56;
1370 extradata[3] = 0xE5;
1371 extradata[4] = 0x80 | (sri<<3);
1372 extradata_size = 5;
1373 } else
1374 extradata_size = 2;
1375 } else if (codec_id == CODEC_ID_TTA) {
1376 extradata_size = 30;
1377 extradata = av_mallocz(extradata_size);
1378 if (extradata == NULL)
1379 return AVERROR(ENOMEM);
1380 ffio_init_context(&b, extradata, extradata_size, 1,
1381 NULL, NULL, NULL, NULL);
1382 avio_write(&b, "TTA1", 4);
1383 avio_wl16(&b, 1);
1384 avio_wl16(&b, track->audio.channels);
1385 avio_wl16(&b, track->audio.bitdepth);
1386 avio_wl32(&b, track->audio.out_samplerate);
1387 avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1388 } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1389 codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1390 extradata_offset = 26;
1391 } else if (codec_id == CODEC_ID_RA_144) {
1392 track->audio.out_samplerate = 8000;
1393 track->audio.channels = 1;
1394 } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1395 codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1396 int flavor;
1397 ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
1398 0, NULL, NULL, NULL, NULL);
1399 avio_skip(&b, 22);
1400 flavor = avio_rb16(&b);
1401 track->audio.coded_framesize = avio_rb32(&b);
1402 avio_skip(&b, 12);
1403 track->audio.sub_packet_h = avio_rb16(&b);
1404 track->audio.frame_size = avio_rb16(&b);
1405 track->audio.sub_packet_size = avio_rb16(&b);
1406 track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1407 if (codec_id == CODEC_ID_RA_288) {
1408 st->codec->block_align = track->audio.coded_framesize;
1409 track->codec_priv.size = 0;
1410 } else {
1411 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1412 const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1413 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1414 st->codec->bit_rate = sipr_bit_rate[flavor];
1415 }
1416 st->codec->block_align = track->audio.sub_packet_size;
1417 extradata_offset = 78;
1418 }
1419 }
1420 track->codec_priv.size -= extradata_offset;
1421
1422 if (codec_id == CODEC_ID_NONE)
1423 av_log(matroska->ctx, AV_LOG_INFO,
1424 "Unknown/unsupported CodecID %s.\n", track->codec_id);
1425
1426 if (track->time_scale < 0.01)
1427 track->time_scale = 1.0;
1428 av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1429
1430 st->codec->codec_id = codec_id;
1431 st->start_time = 0;
1432 if (strcmp(track->language, "und"))
1433 av_metadata_set2(&st->metadata, "language", track->language, 0);
1434 av_metadata_set2(&st->metadata, "title", track->name, 0);
1435
1436 if (track->flag_default)
1437 st->disposition |= AV_DISPOSITION_DEFAULT;
1438 if (track->flag_forced)
1439 st->disposition |= AV_DISPOSITION_FORCED;
1440
1441 if (track->default_duration)
1442 av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1443 track->default_duration, 1000000000, 30000);
1444
1445 if (!st->codec->extradata) {
1446 if(extradata){
1447 st->codec->extradata = extradata;
1448 st->codec->extradata_size = extradata_size;
1449 } else if(track->codec_priv.data && track->codec_priv.size > 0){
1450 st->codec->extradata = av_mallocz(track->codec_priv.size +
1451 FF_INPUT_BUFFER_PADDING_SIZE);
1452 if(st->codec->extradata == NULL)
1453 return AVERROR(ENOMEM);
1454 st->codec->extradata_size = track->codec_priv.size;
1455 memcpy(st->codec->extradata,
1456 track->codec_priv.data + extradata_offset,
1457 track->codec_priv.size);
1458 }
1459 }
1460
1461 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1462 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1463 st->codec->codec_tag = track->video.fourcc;
1464 st->codec->width = track->video.pixel_width;
1465 st->codec->height = track->video.pixel_height;
1466 av_reduce(&st->sample_aspect_ratio.num,
1467 &st->sample_aspect_ratio.den,
1468 st->codec->height * track->video.display_width,
1469 st->codec-> width * track->video.display_height,
1470 255);
1471 if (st->codec->codec_id != CODEC_ID_H264)
1472 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1473 if (track->default_duration)
1474 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1475 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1476 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1477 st->codec->sample_rate = track->audio.out_samplerate;
1478 st->codec->channels = track->audio.channels;
1479 if (st->codec->codec_id != CODEC_ID_AAC)
1480 st->need_parsing = AVSTREAM_PARSE_HEADERS;
1481 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1482 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1483 }
1484 }
1485
1486 attachements = attachements_list->elem;
1487 for (j=0; j<attachements_list->nb_elem; j++) {
1488 if (!(attachements[j].filename && attachements[j].mime &&
1489 attachements[j].bin.data && attachements[j].bin.size > 0)) {
1490 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1491 } else {
1492 AVStream *st = av_new_stream(s, 0);
1493 if (st == NULL)
1494 break;
1495 av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
1496 st->codec->codec_id = CODEC_ID_NONE;
1497 st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1498 st->codec->extradata = av_malloc(attachements[j].bin.size);
1499 if(st->codec->extradata == NULL)
1500 break;
1501 st->codec->extradata_size = attachements[j].bin.size;
1502 memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1503
1504 for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1505 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1506 strlen(ff_mkv_mime_tags[i].str))) {
1507 st->codec->codec_id = ff_mkv_mime_tags[i].id;
1508 break;
1509 }
1510 }
1511 attachements[j].stream = st;
1512 }
1513 }
1514
1515 chapters = chapters_list->elem;
1516 for (i=0; i<chapters_list->nb_elem; i++)
1517 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1518 && (max_start==0 || chapters[i].start > max_start)) {
1519 chapters[i].chapter =
1520 ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1521 chapters[i].start, chapters[i].end,
1522 chapters[i].title);
1523 av_metadata_set2(&chapters[i].chapter->metadata,
1524 "title", chapters[i].title, 0);
1525 max_start = chapters[i].start;
1526 }
1527
1528 index_list = &matroska->index;
1529 index = index_list->elem;
1530 if (index_list->nb_elem
1531 && index[0].time > 100000000000000/matroska->time_scale) {
1532 av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1533 index_scale = matroska->time_scale;
1534 }
1535 for (i=0; i<index_list->nb_elem; i++) {
1536 EbmlList *pos_list = &index[i].pos;
1537 MatroskaIndexPos *pos = pos_list->elem;
1538 for (j=0; j<pos_list->nb_elem; j++) {
1539 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1540 pos[j].track);
1541 if (track && track->stream)
1542 av_add_index_entry(track->stream,
1543 pos[j].pos + matroska->segment_start,
1544 index[i].time/index_scale, 0, 0,
1545 AVINDEX_KEYFRAME);
1546 }
1547 }
1548
1549 matroska_convert_tags(s);
1550
1551 return 0;
1552 }
1553
1554 /*
1555 * Put one packet in an application-supplied AVPacket struct.
1556 * Returns 0 on success or -1 on failure.
1557 */
1558 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1559 AVPacket *pkt)
1560 {
1561 if (matroska->num_packets > 0) {
1562 memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1563 av_free(matroska->packets[0]);
1564 if (matroska->num_packets > 1) {
1565 memmove(&matroska->packets[0], &matroska->packets[1],
1566 (matroska->num_packets - 1) * sizeof(AVPacket *));
1567 matroska->packets =
1568 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1569 sizeof(AVPacket *));
1570 } else {
1571 av_freep(&matroska->packets);
1572 }
1573 matroska->num_packets--;
1574 return 0;
1575 }
1576
1577 return -1;
1578 }
1579
1580 /*
1581 * Free all packets in our internal queue.
1582 */
1583 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1584 {
1585 if (matroska->packets) {
1586 int n;
1587 for (n = 0; n < matroska->num_packets; n++) {
1588 av_free_packet(matroska->packets[n]);
1589 av_free(matroska->packets[n]);
1590 }
1591 av_freep(&matroska->packets);
1592 matroska->num_packets = 0;
1593 }
1594 }
1595
1596 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1597 int size, int64_t pos, uint64_t cluster_time,
1598 uint64_t duration, int is_keyframe,
1599 int64_t cluster_pos)
1600 {
1601 uint64_t timecode = AV_NOPTS_VALUE;
1602 MatroskaTrack *track;
1603 int res = 0;
1604 AVStream *st;
1605 AVPacket *pkt;
1606 int16_t block_time;
1607 uint32_t *lace_size = NULL;
1608 int n, flags, laces = 0;
1609 uint64_t num;
1610
1611 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1612 av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1613 return res;
1614 }
1615 data += n;
1616 size -= n;
1617
1618 track = matroska_find_track_by_num(matroska, num);
1619 if (size <= 3 || !track || !track->stream) {
1620 av_log(matroska->ctx, AV_LOG_INFO,
1621 "Invalid stream %"PRIu64" or size %u\n", num, size);
1622 return res;
1623 }
1624 st = track->stream;
1625 if (st->discard >= AVDISCARD_ALL)
1626 return res;
1627 if (duration == AV_NOPTS_VALUE)
1628 duration = track->default_duration / matroska->time_scale;
1629
1630 block_time = AV_RB16(data);
1631 data += 2;
1632 flags = *data++;
1633 size -= 3;
1634 if (is_keyframe == -1)
1635 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1636
1637 if (cluster_time != (uint64_t)-1
1638 && (block_time >= 0 || cluster_time >= -block_time)) {
1639 timecode = cluster_time + block_time;
1640 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1641 && timecode < track->end_timecode)
1642 is_keyframe = 0; /* overlapping subtitles are not key frame */
1643 if (is_keyframe)
1644 av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1645 track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1646 }
1647
1648 if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1649 if (!is_keyframe || timecode < matroska->skip_to_timecode)
1650 return res;
1651 matroska->skip_to_keyframe = 0;
1652 }
1653
1654 switch ((flags & 0x06) >> 1) {
1655 case 0x0: /* no lacing */
1656 laces = 1;
1657 lace_size = av_mallocz(sizeof(int));
1658 lace_size[0] = size;
1659 break;
1660
1661 case 0x1: /* Xiph lacing */
1662 case 0x2: /* fixed-size lacing */
1663 case 0x3: /* EBML lacing */
1664 assert(size>0); // size <=3 is checked before size-=3 above
1665 laces = (*data) + 1;
1666 data += 1;
1667 size -= 1;
1668 lace_size = av_mallocz(laces * sizeof(int));
1669
1670 switch ((flags & 0x06) >> 1) {
1671 case 0x1: /* Xiph lacing */ {
1672 uint8_t temp;
1673 uint32_t total = 0;
1674 for (n = 0; res == 0 && n < laces - 1; n++) {
1675 while (1) {
1676 if (size == 0) {
1677 res = -1;
1678 break;
1679 }
1680 temp = *data;
1681 lace_size[n] += temp;
1682 data += 1;
1683 size -= 1;
1684 if (temp != 0xff)
1685 break;
1686 }
1687 total += lace_size[n];
1688 }
1689 lace_size[n] = size - total;
1690 break;
1691 }
1692
1693 case 0x2: /* fixed-size lacing */
1694 for (n = 0; n < laces; n++)
1695 lace_size[n] = size / laces;
1696 break;
1697
1698 case 0x3: /* EBML lacing */ {
1699 uint32_t total;
1700 n = matroska_ebmlnum_uint(matroska, data, size, &num);
1701 if (n < 0) {
1702 av_log(matroska->ctx, AV_LOG_INFO,
1703 "EBML block data error\n");
1704 break;
1705 }
1706 data += n;
1707 size -= n;
1708 total = lace_size[0] = num;
1709 for (n = 1; res == 0 && n < laces - 1; n++) {
1710 int64_t snum;
1711 int r;
1712 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1713 if (r < 0) {
1714 av_log(matroska->ctx, AV_LOG_INFO,
1715 "EBML block data error\n");
1716 break;
1717 }
1718 data += r;
1719 size -= r;
1720 lace_size[n] = lace_size[n - 1] + snum;
1721 total += lace_size[n];
1722 }
1723 lace_size[n] = size - total;
1724 break;
1725 }
1726 }
1727 break;
1728 }
1729
1730 if (res == 0) {
1731 for (n = 0; n < laces; n++) {
1732 if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1733 st->codec->codec_id == CODEC_ID_COOK ||
1734 st->codec->codec_id == CODEC_ID_SIPR ||
1735 st->codec->codec_id == CODEC_ID_ATRAC3) &&
1736 st->codec->block_align && track->audio.sub_packet_size) {
1737 int a = st->codec->block_align;
1738 int sps = track->audio.sub_packet_size;
1739 int cfs = track->audio.coded_framesize;
1740 int h = track->audio.sub_packet_h;
1741 int y = track->audio.sub_packet_cnt;
1742 int w = track->audio.frame_size;
1743 int x;
1744
1745 if (!track->audio.pkt_cnt) {
1746 if (st->codec->codec_id == CODEC_ID_RA_288)
1747 for (x=0; x<h/2; x++)
1748 memcpy(track->audio.buf+x*2*w+y*cfs,
1749 data+x*cfs, cfs);
1750 else if (st->codec->codec_id == CODEC_ID_SIPR)
1751 memcpy(track->audio.buf + y*w, data, w);
1752 else
1753 for (x=0; x<w/sps; x++)
1754 memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1755
1756 if (++track->audio.sub_packet_cnt >= h) {
1757 if (st->codec->codec_id == CODEC_ID_SIPR)
1758 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1759 track->audio.sub_packet_cnt = 0;
1760 track->audio.pkt_cnt = h*w / a;
1761 }
1762 }
1763 while (track->audio.pkt_cnt) {
1764 pkt = av_mallocz(sizeof(AVPacket));
1765 av_new_packet(pkt, a);
1766 memcpy(pkt->data, track->audio.buf
1767 + a * (h*w / a - track->audio.pkt_cnt--), a);
1768 pkt->pos = pos;
1769 pkt->stream_index = st->index;
1770 dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1771 }
1772 } else {
1773 MatroskaTrackEncoding *encodings = track->encodings.elem;
1774 int offset = 0, pkt_size = lace_size[n];
1775 uint8_t *pkt_data = data;
1776
1777 if (pkt_size > size) {
1778 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1779 break;
1780 }
1781
1782 if (encodings && encodings->scope & 1) {
1783 offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1784 if (offset < 0)
1785 continue;
1786 }
1787
1788 pkt = av_mallocz(sizeof(AVPacket));
1789 /* XXX: prevent data copy... */
1790 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1791 av_free(pkt);
1792 res = AVERROR(ENOMEM);
1793 break;
1794 }
1795 if (offset)
1796 memcpy (pkt->data, encodings->compression.settings.data, offset);
1797 memcpy (pkt->data+offset, pkt_data, pkt_size);
1798
1799 if (pkt_data != data)
1800 av_free(pkt_data);
1801
1802 if (n == 0)
1803 pkt->flags = is_keyframe;
1804 pkt->stream_index = st->index;
1805
1806 if (track->ms_compat)
1807 pkt->dts = timecode;
1808 else
1809 pkt->pts = timecode;
1810 pkt->pos = pos;
1811 if (st->codec->codec_id == CODEC_ID_TEXT)
1812 pkt->convergence_duration = duration;
1813 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1814 pkt->duration = duration;
1815
1816 if (st->codec->codec_id == CODEC_ID_SSA)
1817 matroska_fix_ass_packet(matroska, pkt, duration);
1818
1819 if (matroska->prev_pkt &&
1820 timecode != AV_NOPTS_VALUE &&
1821 matroska->prev_pkt->pts == timecode &&
1822 matroska->prev_pkt->stream_index == st->index &&
1823 st->codec->codec_id == CODEC_ID_SSA)
1824 matroska_merge_packets(matroska->prev_pkt, pkt);
1825 else {
1826 dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1827 matroska->prev_pkt = pkt;
1828 }
1829 }
1830
1831 if (timecode != AV_NOPTS_VALUE)
1832 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1833 data += lace_size[n];
1834 size -= lace_size[n];
1835 }
1836 }
1837
1838 av_free(lace_size);
1839 return res;
1840 }
1841
1842 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1843 {
1844 MatroskaCluster cluster = { 0 };
1845 EbmlList *blocks_list;
1846 MatroskaBlock *blocks;
1847 int i, res;
1848 int64_t pos = avio_tell(matroska->ctx->pb);
1849 matroska->prev_pkt = NULL;
1850 if (matroska->current_id)
1851 pos -= 4; /* sizeof the ID which was already read */
1852 res = ebml_parse(matroska, matroska_clusters, &cluster);
1853 blocks_list = &cluster.blocks;
1854 blocks = blocks_list->elem;
1855 for (i=0; i<blocks_list->nb_elem; i++)
1856 if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1857 int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1858 if (!blocks[i].non_simple)
1859 blocks[i].duration = AV_NOPTS_VALUE;
1860 res=matroska_parse_block(matroska,
1861 blocks[i].bin.data, blocks[i].bin.size,
1862 blocks[i].bin.pos, cluster.timecode,
1863 blocks[i].duration, is_keyframe,
1864 pos);
1865 }
1866 ebml_free(matroska_cluster, &cluster);
1867 if (res < 0) matroska->done = 1;
1868 return res;
1869 }
1870
1871 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1872 {
1873 MatroskaDemuxContext *matroska = s->priv_data;
1874
1875 while (matroska_deliver_packet(matroska, pkt)) {
1876 if (matroska->done)
1877 return AVERROR_EOF;
1878 matroska_parse_cluster(matroska);
1879 }
1880
1881 return 0;
1882 }
1883
1884 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1885 int64_t timestamp, int flags)
1886 {
1887 MatroskaDemuxContext *matroska = s->priv_data;
1888 MatroskaTrack *tracks = matroska->tracks.elem;
1889 AVStream *st = s->streams[stream_index];
1890 int i, index, index_sub, index_min;
1891
1892 if (!st->nb_index_entries)
1893 return 0;
1894 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1895
1896 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1897 avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1898 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1899 matroska_clear_queue(matroska);
1900 if (matroska_parse_cluster(matroska) < 0)
1901 break;
1902 }
1903 }
1904
1905 matroska_clear_queue(matroska);
1906 if (index < 0)
1907 return 0;
1908
1909 index_min = index;
1910 for (i=0; i < matroska->tracks.nb_elem; i++) {
1911 tracks[i].end_timecode = 0;
1912 if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1913 && !tracks[i].stream->discard != AVDISCARD_ALL) {
1914 index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1915 if (index_sub >= 0
1916 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1917 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1918 index_min = index_sub;
1919 }
1920 }
1921
1922 avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1923 matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1924 matroska->skip_to_timecode = st->index_entries[index].timestamp;
1925 matroska->done = 0;
1926 av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1927 return 0;
1928 }
1929
1930 static int matroska_read_close(AVFormatContext *s)
1931 {
1932 MatroskaDemuxContext *matroska = s->priv_data;
1933 MatroskaTrack *tracks = matroska->tracks.elem;
1934 int n;
1935
1936 matroska_clear_queue(matroska);
1937
1938 for (n=0; n < matroska->tracks.nb_elem; n++)
1939 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1940 av_free(tracks[n].audio.buf);
1941 ebml_free(matroska_segment, matroska);
1942
1943 return 0;
1944 }
1945
1946 AVInputFormat ff_matroska_demuxer = {
1947 "matroska,webm",
1948 NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
1949 sizeof(MatroskaDemuxContext),
1950 matroska_probe,
1951 matroska_read_header,
1952 matroska_read_packet,
1953 matroska_read_close,
1954 matroska_read_seek,
1955 };