Move the internal function declarations in avformat.h to internal.h.
[ffmpeg.git] / libavformat / matroskadec.c
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 #include "internal.h"
34 /* For ff_codec_get_id(). */
35 #include "riff.h"
36 #include "isom.h"
37 #include "rm.h"
38 #include "matroska.h"
39 #include "libavcodec/mpeg4audio.h"
40 #include "libavutil/intfloat_readwrite.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/avstring.h"
43 #include "libavutil/lzo.h"
44 #if CONFIG_ZLIB
45 #include <zlib.h>
46 #endif
47 #if CONFIG_BZLIB
48 #include <bzlib.h>
49 #endif
50
51 typedef enum {
52     EBML_NONE,
53     EBML_UINT,
54     EBML_FLOAT,
55     EBML_STR,
56     EBML_UTF8,
57     EBML_BIN,
58     EBML_NEST,
59     EBML_PASS,
60     EBML_STOP,
61 } EbmlType;
62
63 typedef const struct EbmlSyntax {
64     uint32_t id;
65     EbmlType type;
66     int list_elem_size;
67     int data_offset;
68     union {
69         uint64_t    u;
70         double      f;
71         const char *s;
72         const struct EbmlSyntax *n;
73     } def;
74 } EbmlSyntax;
75
76 typedef struct {
77     int nb_elem;
78     void *elem;
79 } EbmlList;
80
81 typedef struct {
82     int      size;
83     uint8_t *data;
84     int64_t  pos;
85 } EbmlBin;
86
87 typedef struct {
88     uint64_t version;
89     uint64_t max_size;
90     uint64_t id_length;
91     char    *doctype;
92     uint64_t doctype_version;
93 } Ebml;
94
95 typedef struct {
96     uint64_t algo;
97     EbmlBin  settings;
98 } MatroskaTrackCompression;
99
100 typedef struct {
101     uint64_t scope;
102     uint64_t type;
103     MatroskaTrackCompression compression;
104 } MatroskaTrackEncoding;
105
106 typedef struct {
107     double   frame_rate;
108     uint64_t display_width;
109     uint64_t display_height;
110     uint64_t pixel_width;
111     uint64_t pixel_height;
112     uint64_t fourcc;
113 } MatroskaTrackVideo;
114
115 typedef struct {
116     double   samplerate;
117     double   out_samplerate;
118     uint64_t bitdepth;
119     uint64_t channels;
120
121     /* real audio header (extracted from extradata) */
122     int      coded_framesize;
123     int      sub_packet_h;
124     int      frame_size;
125     int      sub_packet_size;
126     int      sub_packet_cnt;
127     int      pkt_cnt;
128     uint8_t *buf;
129 } MatroskaTrackAudio;
130
131 typedef struct {
132     uint64_t num;
133     uint64_t uid;
134     uint64_t type;
135     char    *name;
136     char    *codec_id;
137     EbmlBin  codec_priv;
138     char    *language;
139     double time_scale;
140     uint64_t default_duration;
141     uint64_t flag_default;
142     MatroskaTrackVideo video;
143     MatroskaTrackAudio audio;
144     EbmlList encodings;
145
146     AVStream *stream;
147     int64_t end_timecode;
148     int ms_compat;
149 } MatroskaTrack;
150
151 typedef struct {
152     uint64_t uid;
153     char *filename;
154     char *mime;
155     EbmlBin bin;
156
157     AVStream *stream;
158 } MatroskaAttachement;
159
160 typedef struct {
161     uint64_t start;
162     uint64_t end;
163     uint64_t uid;
164     char    *title;
165
166     AVChapter *chapter;
167 } MatroskaChapter;
168
169 typedef struct {
170     uint64_t track;
171     uint64_t pos;
172 } MatroskaIndexPos;
173
174 typedef struct {
175     uint64_t time;
176     EbmlList pos;
177 } MatroskaIndex;
178
179 typedef struct {
180     char *name;
181     char *string;
182     char *lang;
183     uint64_t def;
184     EbmlList sub;
185 } MatroskaTag;
186
187 typedef struct {
188     char    *type;
189     uint64_t typevalue;
190     uint64_t trackuid;
191     uint64_t chapteruid;
192     uint64_t attachuid;
193 } MatroskaTagTarget;
194
195 typedef struct {
196     MatroskaTagTarget target;
197     EbmlList tag;
198 } MatroskaTags;
199
200 typedef struct {
201     uint64_t id;
202     uint64_t pos;
203 } MatroskaSeekhead;
204
205 typedef struct {
206     uint64_t start;
207     uint64_t length;
208 } MatroskaLevel;
209
210 typedef struct {
211     AVFormatContext *ctx;
212
213     /* EBML stuff */
214     int num_levels;
215     MatroskaLevel levels[EBML_MAX_DEPTH];
216     int level_up;
217
218     uint64_t time_scale;
219     double   duration;
220     char    *title;
221     EbmlList tracks;
222     EbmlList attachments;
223     EbmlList chapters;
224     EbmlList index;
225     EbmlList tags;
226     EbmlList seekhead;
227
228     /* byte position of the segment inside the stream */
229     int64_t segment_start;
230
231     /* the packet queue */
232     AVPacket **packets;
233     int num_packets;
234     AVPacket *prev_pkt;
235
236     int done;
237     int has_cluster_id;
238
239     /* What to skip before effectively reading a packet. */
240     int skip_to_keyframe;
241     uint64_t skip_to_timecode;
242 } MatroskaDemuxContext;
243
244 typedef struct {
245     uint64_t duration;
246     int64_t  reference;
247     uint64_t non_simple;
248     EbmlBin  bin;
249 } MatroskaBlock;
250
251 typedef struct {
252     uint64_t timecode;
253     EbmlList blocks;
254 } MatroskaCluster;
255
256 static EbmlSyntax ebml_header[] = {
257     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
258     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
259     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
260     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
261     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
262     { EBML_ID_EBMLVERSION,            EBML_NONE },
263     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
264     { 0 }
265 };
266
267 static EbmlSyntax ebml_syntax[] = {
268     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
269     { 0 }
270 };
271
272 static EbmlSyntax matroska_info[] = {
273     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
274     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
275     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
276     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
277     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
278     { MATROSKA_ID_DATEUTC,            EBML_NONE },
279     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
280     { 0 }
281 };
282
283 static EbmlSyntax matroska_track_video[] = {
284     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
285     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
286     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
287     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
288     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
289     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
290     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
291     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
292     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
293     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
294     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
295     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
296     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
297     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
298     { 0 }
299 };
300
301 static EbmlSyntax matroska_track_audio[] = {
302     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
303     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
304     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
305     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
306     { 0 }
307 };
308
309 static EbmlSyntax matroska_track_encoding_compression[] = {
310     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
311     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
312     { 0 }
313 };
314
315 static EbmlSyntax matroska_track_encoding[] = {
316     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
317     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
318     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
319     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
320     { 0 }
321 };
322
323 static EbmlSyntax matroska_track_encodings[] = {
324     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
325     { 0 }
326 };
327
328 static EbmlSyntax matroska_track[] = {
329     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
330     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
331     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
332     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
333     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
334     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
335     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
336     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
337     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
338     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
339     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
340     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
341     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
342     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
343     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
344     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
345     { MATROSKA_ID_CODECNAME,            EBML_NONE },
346     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
347     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
348     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
349     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
350     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
351     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
352     { 0 }
353 };
354
355 static EbmlSyntax matroska_tracks[] = {
356     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
357     { 0 }
358 };
359
360 static EbmlSyntax matroska_attachment[] = {
361     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
362     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
363     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
364     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
365     { MATROSKA_ID_FILEDESC,           EBML_NONE },
366     { 0 }
367 };
368
369 static EbmlSyntax matroska_attachments[] = {
370     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
371     { 0 }
372 };
373
374 static EbmlSyntax matroska_chapter_display[] = {
375     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
376     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
377     { 0 }
378 };
379
380 static EbmlSyntax matroska_chapter_entry[] = {
381     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
382     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
383     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
384     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
385     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
386     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
387     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
388     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
389     { 0 }
390 };
391
392 static EbmlSyntax matroska_chapter[] = {
393     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
394     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
395     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
396     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
397     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
398     { 0 }
399 };
400
401 static EbmlSyntax matroska_chapters[] = {
402     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
403     { 0 }
404 };
405
406 static EbmlSyntax matroska_index_pos[] = {
407     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
408     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
409     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
410     { 0 }
411 };
412
413 static EbmlSyntax matroska_index_entry[] = {
414     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
415     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
416     { 0 }
417 };
418
419 static EbmlSyntax matroska_index[] = {
420     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
421     { 0 }
422 };
423
424 static EbmlSyntax matroska_simpletag[] = {
425     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
426     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
427     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
428     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
429     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
430     { 0 }
431 };
432
433 static EbmlSyntax matroska_tagtargets[] = {
434     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
435     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
436     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
437     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
438     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
439     { 0 }
440 };
441
442 static EbmlSyntax matroska_tag[] = {
443     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
444     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
445     { 0 }
446 };
447
448 static EbmlSyntax matroska_tags[] = {
449     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
450     { 0 }
451 };
452
453 static EbmlSyntax matroska_seekhead_entry[] = {
454     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
455     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
456     { 0 }
457 };
458
459 static EbmlSyntax matroska_seekhead[] = {
460     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
461     { 0 }
462 };
463
464 static EbmlSyntax matroska_segment[] = {
465     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
466     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
467     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
468     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
469     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
470     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
471     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
472     { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
473     { 0 }
474 };
475
476 static EbmlSyntax matroska_segments[] = {
477     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
478     { 0 }
479 };
480
481 static EbmlSyntax matroska_blockgroup[] = {
482     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
483     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
484     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
485     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
486     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
487     { 0 }
488 };
489
490 static EbmlSyntax matroska_cluster[] = {
491     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
492     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
493     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
494     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
495     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
496     { 0 }
497 };
498
499 static EbmlSyntax matroska_clusters[] = {
500     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
501     { MATROSKA_ID_INFO,           EBML_NONE },
502     { MATROSKA_ID_CUES,           EBML_NONE },
503     { MATROSKA_ID_TAGS,           EBML_NONE },
504     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
505     { 0 }
506 };
507
508 /*
509  * Return: Whether we reached the end of a level in the hierarchy or not.
510  */
511 static int ebml_level_end(MatroskaDemuxContext *matroska)
512 {
513     ByteIOContext *pb = matroska->ctx->pb;
514     int64_t pos = url_ftell(pb);
515
516     if (matroska->num_levels > 0) {
517         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
518         if (pos - level->start >= level->length) {
519             matroska->num_levels--;
520             return 1;
521         }
522     }
523     return 0;
524 }
525
526 /*
527  * Read: an "EBML number", which is defined as a variable-length
528  * array of bytes. The first byte indicates the length by giving a
529  * number of 0-bits followed by a one. The position of the first
530  * "one" bit inside the first byte indicates the length of this
531  * number.
532  * Returns: number of bytes read, < 0 on error
533  */
534 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
535                          int max_size, uint64_t *number)
536 {
537     int len_mask = 0x80, read = 1, n = 1;
538     int64_t total = 0;
539
540     /* The first byte tells us the length in bytes - get_byte() can normally
541      * return 0, but since that's not a valid first ebmlID byte, we can
542      * use it safely here to catch EOS. */
543     if (!(total = get_byte(pb))) {
544         /* we might encounter EOS here */
545         if (!url_feof(pb)) {
546             int64_t pos = url_ftell(pb);
547             av_log(matroska->ctx, AV_LOG_ERROR,
548                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
549                    pos, pos);
550         }
551         return AVERROR(EIO); /* EOS or actual I/O error */
552     }
553
554     /* get the length of the EBML number */
555     while (read <= max_size && !(total & len_mask)) {
556         read++;
557         len_mask >>= 1;
558     }
559     if (read > max_size) {
560         int64_t pos = url_ftell(pb) - 1;
561         av_log(matroska->ctx, AV_LOG_ERROR,
562                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
563                (uint8_t) total, pos, pos);
564         return AVERROR_INVALIDDATA;
565     }
566
567     /* read out length */
568     total &= ~len_mask;
569     while (n++ < read)
570         total = (total << 8) | get_byte(pb);
571
572     *number = total;
573
574     return read;
575 }
576
577 /*
578  * Read the next element as an unsigned int.
579  * 0 is success, < 0 is failure.
580  */
581 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
582 {
583     int n = 0;
584
585     if (size < 1 || size > 8)
586         return AVERROR_INVALIDDATA;
587
588     /* big-endian ordering; build up number */
589     *num = 0;
590     while (n++ < size)
591         *num = (*num << 8) | get_byte(pb);
592
593     return 0;
594 }
595
596 /*
597  * Read the next element as a float.
598  * 0 is success, < 0 is failure.
599  */
600 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
601 {
602     if (size == 4) {
603         *num= av_int2flt(get_be32(pb));
604     } else if(size==8){
605         *num= av_int2dbl(get_be64(pb));
606     } else
607         return AVERROR_INVALIDDATA;
608
609     return 0;
610 }
611
612 /*
613  * Read the next element as an ASCII string.
614  * 0 is success, < 0 is failure.
615  */
616 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
617 {
618     av_free(*str);
619     /* EBML strings are usually not 0-terminated, so we allocate one
620      * byte more, read the string and NULL-terminate it ourselves. */
621     if (!(*str = av_malloc(size + 1)))
622         return AVERROR(ENOMEM);
623     if (get_buffer(pb, (uint8_t *) *str, size) != size) {
624         av_free(*str);
625         return AVERROR(EIO);
626     }
627     (*str)[size] = '\0';
628
629     return 0;
630 }
631
632 /*
633  * Read the next element as binary data.
634  * 0 is success, < 0 is failure.
635  */
636 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
637 {
638     av_free(bin->data);
639     if (!(bin->data = av_malloc(length)))
640         return AVERROR(ENOMEM);
641
642     bin->size = length;
643     bin->pos  = url_ftell(pb);
644     if (get_buffer(pb, bin->data, length) != length)
645         return AVERROR(EIO);
646
647     return 0;
648 }
649
650 /*
651  * Read the next element, but only the header. The contents
652  * are supposed to be sub-elements which can be read separately.
653  * 0 is success, < 0 is failure.
654  */
655 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
656 {
657     ByteIOContext *pb = matroska->ctx->pb;
658     MatroskaLevel *level;
659
660     if (matroska->num_levels >= EBML_MAX_DEPTH) {
661         av_log(matroska->ctx, AV_LOG_ERROR,
662                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
663         return AVERROR(ENOSYS);
664     }
665
666     level = &matroska->levels[matroska->num_levels++];
667     level->start = url_ftell(pb);
668     level->length = length;
669
670     return 0;
671 }
672
673 /*
674  * Read signed/unsigned "EBML" numbers.
675  * Return: number of bytes processed, < 0 on error
676  */
677 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
678                                  uint8_t *data, uint32_t size, uint64_t *num)
679 {
680     ByteIOContext pb;
681     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
682     return ebml_read_num(matroska, &pb, 8, num);
683 }
684
685 /*
686  * Same as above, but signed.
687  */
688 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
689                                  uint8_t *data, uint32_t size, int64_t *num)
690 {
691     uint64_t unum;
692     int res;
693
694     /* read as unsigned number first */
695     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
696         return res;
697
698     /* make signed (weird way) */
699     *num = unum - ((1LL << (7*res - 1)) - 1);
700
701     return res;
702 }
703
704 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
705                            EbmlSyntax *syntax, void *data);
706
707 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
708                          uint32_t id, void *data)
709 {
710     int i;
711     for (i=0; syntax[i].id; i++)
712         if (id == syntax[i].id)
713             break;
714     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
715         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
716     return ebml_parse_elem(matroska, &syntax[i], data);
717 }
718
719 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
720                       void *data)
721 {
722     uint64_t id;
723     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
724     id |= 1 << 7*res;
725     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
726 }
727
728 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
729                            void *data)
730 {
731     int i, res = 0;
732
733     for (i=0; syntax[i].id; i++)
734         switch (syntax[i].type) {
735         case EBML_UINT:
736             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
737             break;
738         case EBML_FLOAT:
739             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
740             break;
741         case EBML_STR:
742         case EBML_UTF8:
743             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
744             break;
745         }
746
747     while (!res && !ebml_level_end(matroska))
748         res = ebml_parse(matroska, syntax, data);
749
750     return res;
751 }
752
753 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
754                            EbmlSyntax *syntax, void *data)
755 {
756     ByteIOContext *pb = matroska->ctx->pb;
757     uint32_t id = syntax->id;
758     uint64_t length;
759     int res;
760
761     data = (char *)data + syntax->data_offset;
762     if (syntax->list_elem_size) {
763         EbmlList *list = data;
764         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
765         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
766         memset(data, 0, syntax->list_elem_size);
767         list->nb_elem++;
768     }
769
770     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
771         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
772             return res;
773
774     switch (syntax->type) {
775     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
776     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
777     case EBML_STR:
778     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
779     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
780     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
781                          return res;
782                      if (id == MATROSKA_ID_SEGMENT)
783                          matroska->segment_start = url_ftell(matroska->ctx->pb);
784                      return ebml_parse_nest(matroska, syntax->def.n, data);
785     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
786     case EBML_STOP:  *(int *)data = 1;      return 1;
787     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
788     }
789     if (res == AVERROR_INVALIDDATA)
790         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
791     else if (res == AVERROR(EIO))
792         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
793     return res;
794 }
795
796 static void ebml_free(EbmlSyntax *syntax, void *data)
797 {
798     int i, j;
799     for (i=0; syntax[i].id; i++) {
800         void *data_off = (char *)data + syntax[i].data_offset;
801         switch (syntax[i].type) {
802         case EBML_STR:
803         case EBML_UTF8:  av_freep(data_off);                      break;
804         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
805         case EBML_NEST:
806             if (syntax[i].list_elem_size) {
807                 EbmlList *list = data_off;
808                 char *ptr = list->elem;
809                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
810                     ebml_free(syntax[i].def.n, ptr);
811                 av_free(list->elem);
812             } else
813                 ebml_free(syntax[i].def.n, data_off);
814         default:  break;
815         }
816     }
817 }
818
819
820 /*
821  * Autodetecting...
822  */
823 static int matroska_probe(AVProbeData *p)
824 {
825     uint64_t total = 0;
826     int len_mask = 0x80, size = 1, n = 1;
827     static const char probe_data[] = "matroska";
828
829     /* EBML header? */
830     if (AV_RB32(p->buf) != EBML_ID_HEADER)
831         return 0;
832
833     /* length of header */
834     total = p->buf[4];
835     while (size <= 8 && !(total & len_mask)) {
836         size++;
837         len_mask >>= 1;
838     }
839     if (size > 8)
840       return 0;
841     total &= (len_mask - 1);
842     while (n < size)
843         total = (total << 8) | p->buf[4 + n++];
844
845     /* Does the probe data contain the whole header? */
846     if (p->buf_size < 4 + size + total)
847       return 0;
848
849     /* The header must contain the document type 'matroska'. For now,
850      * we don't parse the whole header but simply check for the
851      * availability of that array of characters inside the header.
852      * Not fully fool-proof, but good enough. */
853     for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
854         if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
855             return AVPROBE_SCORE_MAX;
856
857     return 0;
858 }
859
860 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
861                                                  int num)
862 {
863     MatroskaTrack *tracks = matroska->tracks.elem;
864     int i;
865
866     for (i=0; i < matroska->tracks.nb_elem; i++)
867         if (tracks[i].num == num)
868             return &tracks[i];
869
870     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
871     return NULL;
872 }
873
874 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
875                                   MatroskaTrack *track)
876 {
877     MatroskaTrackEncoding *encodings = track->encodings.elem;
878     uint8_t* data = *buf;
879     int isize = *buf_size;
880     uint8_t* pkt_data = NULL;
881     int pkt_size = isize;
882     int result = 0;
883     int olen;
884
885     switch (encodings[0].compression.algo) {
886     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
887         return encodings[0].compression.settings.size;
888     case MATROSKA_TRACK_ENCODING_COMP_LZO:
889         do {
890             olen = pkt_size *= 3;
891             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
892             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
893         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
894         if (result)
895             goto failed;
896         pkt_size -= olen;
897         break;
898 #if CONFIG_ZLIB
899     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
900         z_stream zstream = {0};
901         if (inflateInit(&zstream) != Z_OK)
902             return -1;
903         zstream.next_in = data;
904         zstream.avail_in = isize;
905         do {
906             pkt_size *= 3;
907             pkt_data = av_realloc(pkt_data, pkt_size);
908             zstream.avail_out = pkt_size - zstream.total_out;
909             zstream.next_out = pkt_data + zstream.total_out;
910             result = inflate(&zstream, Z_NO_FLUSH);
911         } while (result==Z_OK && pkt_size<10000000);
912         pkt_size = zstream.total_out;
913         inflateEnd(&zstream);
914         if (result != Z_STREAM_END)
915             goto failed;
916         break;
917     }
918 #endif
919 #if CONFIG_BZLIB
920     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
921         bz_stream bzstream = {0};
922         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
923             return -1;
924         bzstream.next_in = data;
925         bzstream.avail_in = isize;
926         do {
927             pkt_size *= 3;
928             pkt_data = av_realloc(pkt_data, pkt_size);
929             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
930             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
931             result = BZ2_bzDecompress(&bzstream);
932         } while (result==BZ_OK && pkt_size<10000000);
933         pkt_size = bzstream.total_out_lo32;
934         BZ2_bzDecompressEnd(&bzstream);
935         if (result != BZ_STREAM_END)
936             goto failed;
937         break;
938     }
939 #endif
940     default:
941         return -1;
942     }
943
944     *buf = pkt_data;
945     *buf_size = pkt_size;
946     return 0;
947  failed:
948     av_free(pkt_data);
949     return -1;
950 }
951
952 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
953                                     AVPacket *pkt, uint64_t display_duration)
954 {
955     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
956     for (; *ptr!=',' && ptr<end-1; ptr++);
957     if (*ptr == ',')
958         layer = ++ptr;
959     for (; *ptr!=',' && ptr<end-1; ptr++);
960     if (*ptr == ',') {
961         int64_t end_pts = pkt->pts + display_duration;
962         int sc = matroska->time_scale * pkt->pts / 10000000;
963         int ec = matroska->time_scale * end_pts  / 10000000;
964         int sh, sm, ss, eh, em, es, len;
965         sh = sc/360000;  sc -= 360000*sh;
966         sm = sc/  6000;  sc -=   6000*sm;
967         ss = sc/   100;  sc -=    100*ss;
968         eh = ec/360000;  ec -= 360000*eh;
969         em = ec/  6000;  ec -=   6000*em;
970         es = ec/   100;  ec -=    100*es;
971         *ptr++ = '\0';
972         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
973         if (!(line = av_malloc(len)))
974             return;
975         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
976                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
977         av_free(pkt->data);
978         pkt->data = line;
979         pkt->size = strlen(line);
980     }
981 }
982
983 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
984 {
985     out->data = av_realloc(out->data, out->size+in->size);
986     memcpy(out->data+out->size, in->data, in->size);
987     out->size += in->size;
988     av_destruct_packet(in);
989     av_free(in);
990 }
991
992 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
993                                  AVMetadata **metadata, char *prefix)
994 {
995     MatroskaTag *tags = list->elem;
996     char key[1024];
997     int i;
998
999     for (i=0; i < list->nb_elem; i++) {
1000         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1001         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1002         else         av_strlcpy(key, tags[i].name, sizeof(key));
1003         if (tags[i].def || !lang) {
1004         av_metadata_set(metadata, key, tags[i].string);
1005         if (tags[i].sub.nb_elem)
1006             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1007         }
1008         if (lang) {
1009             av_strlcat(key, "-", sizeof(key));
1010             av_strlcat(key, lang, sizeof(key));
1011             av_metadata_set(metadata, key, tags[i].string);
1012             if (tags[i].sub.nb_elem)
1013                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1014         }
1015     }
1016 }
1017
1018 static void matroska_convert_tags(AVFormatContext *s)
1019 {
1020     MatroskaDemuxContext *matroska = s->priv_data;
1021     MatroskaTags *tags = matroska->tags.elem;
1022     int i, j;
1023
1024     for (i=0; i < matroska->tags.nb_elem; i++) {
1025         if (tags[i].target.attachuid) {
1026             MatroskaAttachement *attachment = matroska->attachments.elem;
1027             for (j=0; j<matroska->attachments.nb_elem; j++)
1028                 if (attachment[j].uid == tags[i].target.attachuid)
1029                     matroska_convert_tag(s, &tags[i].tag,
1030                                          &attachment[j].stream->metadata, NULL);
1031         } else if (tags[i].target.chapteruid) {
1032             MatroskaChapter *chapter = matroska->chapters.elem;
1033             for (j=0; j<matroska->chapters.nb_elem; j++)
1034                 if (chapter[j].uid == tags[i].target.chapteruid)
1035                     matroska_convert_tag(s, &tags[i].tag,
1036                                          &chapter[j].chapter->metadata, NULL);
1037         } else if (tags[i].target.trackuid) {
1038             MatroskaTrack *track = matroska->tracks.elem;
1039             for (j=0; j<matroska->tracks.nb_elem; j++)
1040                 if (track[j].uid == tags[i].target.trackuid)
1041                     matroska_convert_tag(s, &tags[i].tag,
1042                                          &track[j].stream->metadata, NULL);
1043         } else {
1044             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1045                                  tags[i].target.type);
1046         }
1047     }
1048 }
1049
1050 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1051 {
1052     EbmlList *seekhead_list = &matroska->seekhead;
1053     MatroskaSeekhead *seekhead = seekhead_list->elem;
1054     uint32_t level_up = matroska->level_up;
1055     int64_t before_pos = url_ftell(matroska->ctx->pb);
1056     MatroskaLevel level;
1057     int i;
1058
1059     for (i=0; i<seekhead_list->nb_elem; i++) {
1060         int64_t offset = seekhead[i].pos + matroska->segment_start;
1061
1062         if (seekhead[i].pos <= before_pos
1063             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1064             || seekhead[i].id == MATROSKA_ID_CLUSTER)
1065             continue;
1066
1067         /* seek */
1068         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1069             continue;
1070
1071         /* We don't want to lose our seekhead level, so we add
1072          * a dummy. This is a crude hack. */
1073         if (matroska->num_levels == EBML_MAX_DEPTH) {
1074             av_log(matroska->ctx, AV_LOG_INFO,
1075                    "Max EBML element depth (%d) reached, "
1076                    "cannot parse further.\n", EBML_MAX_DEPTH);
1077             break;
1078         }
1079
1080         level.start = 0;
1081         level.length = (uint64_t)-1;
1082         matroska->levels[matroska->num_levels] = level;
1083         matroska->num_levels++;
1084
1085         ebml_parse(matroska, matroska_segment, matroska);
1086
1087         /* remove dummy level */
1088         while (matroska->num_levels) {
1089             uint64_t length = matroska->levels[--matroska->num_levels].length;
1090             if (length == (uint64_t)-1)
1091                 break;
1092         }
1093     }
1094
1095     /* seek back */
1096     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1097     matroska->level_up = level_up;
1098 }
1099
1100 static int matroska_aac_profile(char *codec_id)
1101 {
1102     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1103     int profile;
1104
1105     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1106         if (strstr(codec_id, aac_profiles[profile]))
1107             break;
1108     return profile + 1;
1109 }
1110
1111 static int matroska_aac_sri(int samplerate)
1112 {
1113     int sri;
1114
1115     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1116         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1117             break;
1118     return sri;
1119 }
1120
1121 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1122 {
1123     MatroskaDemuxContext *matroska = s->priv_data;
1124     EbmlList *attachements_list = &matroska->attachments;
1125     MatroskaAttachement *attachements;
1126     EbmlList *chapters_list = &matroska->chapters;
1127     MatroskaChapter *chapters;
1128     MatroskaTrack *tracks;
1129     EbmlList *index_list;
1130     MatroskaIndex *index;
1131     int index_scale = 1;
1132     uint64_t max_start = 0;
1133     Ebml ebml = { 0 };
1134     AVStream *st;
1135     int i, j;
1136
1137     matroska->ctx = s;
1138
1139     /* First read the EBML header. */
1140     if (ebml_parse(matroska, ebml_syntax, &ebml)
1141         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1142         || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1143         || ebml.doctype_version > 2) {
1144         av_log(matroska->ctx, AV_LOG_ERROR,
1145                "EBML header using unsupported features\n"
1146                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1147                ebml.version, ebml.doctype, ebml.doctype_version);
1148         return AVERROR_PATCHWELCOME;
1149     }
1150     ebml_free(ebml_syntax, &ebml);
1151
1152     /* The next thing is a segment. */
1153     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1154         return -1;
1155     matroska_execute_seekhead(matroska);
1156
1157     if (matroska->duration)
1158         matroska->ctx->duration = matroska->duration * matroska->time_scale
1159                                   * 1000 / AV_TIME_BASE;
1160     av_metadata_set(&s->metadata, "title", matroska->title);
1161
1162     tracks = matroska->tracks.elem;
1163     for (i=0; i < matroska->tracks.nb_elem; i++) {
1164         MatroskaTrack *track = &tracks[i];
1165         enum CodecID codec_id = CODEC_ID_NONE;
1166         EbmlList *encodings_list = &tracks->encodings;
1167         MatroskaTrackEncoding *encodings = encodings_list->elem;
1168         uint8_t *extradata = NULL;
1169         int extradata_size = 0;
1170         int extradata_offset = 0;
1171         ByteIOContext b;
1172
1173         /* Apply some sanity checks. */
1174         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1175             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1176             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1177             av_log(matroska->ctx, AV_LOG_INFO,
1178                    "Unknown or unsupported track type %"PRIu64"\n",
1179                    track->type);
1180             continue;
1181         }
1182         if (track->codec_id == NULL)
1183             continue;
1184
1185         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1186             if (!track->default_duration)
1187                 track->default_duration = 1000000000/track->video.frame_rate;
1188             if (!track->video.display_width)
1189                 track->video.display_width = track->video.pixel_width;
1190             if (!track->video.display_height)
1191                 track->video.display_height = track->video.pixel_height;
1192         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1193             if (!track->audio.out_samplerate)
1194                 track->audio.out_samplerate = track->audio.samplerate;
1195         }
1196         if (encodings_list->nb_elem > 1) {
1197             av_log(matroska->ctx, AV_LOG_ERROR,
1198                    "Multiple combined encodings no supported");
1199         } else if (encodings_list->nb_elem == 1) {
1200             if (encodings[0].type ||
1201                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1202 #if CONFIG_ZLIB
1203                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1204 #endif
1205 #if CONFIG_BZLIB
1206                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1207 #endif
1208                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1209                 encodings[0].scope = 0;
1210                 av_log(matroska->ctx, AV_LOG_ERROR,
1211                        "Unsupported encoding type");
1212             } else if (track->codec_priv.size && encodings[0].scope&2) {
1213                 uint8_t *codec_priv = track->codec_priv.data;
1214                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1215                                                     &track->codec_priv.size,
1216                                                     track);
1217                 if (offset < 0) {
1218                     track->codec_priv.data = NULL;
1219                     track->codec_priv.size = 0;
1220                     av_log(matroska->ctx, AV_LOG_ERROR,
1221                            "Failed to decode codec private data\n");
1222                 } else if (offset > 0) {
1223                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1224                     memcpy(track->codec_priv.data,
1225                            encodings[0].compression.settings.data, offset);
1226                     memcpy(track->codec_priv.data+offset, codec_priv,
1227                            track->codec_priv.size);
1228                     track->codec_priv.size += offset;
1229                 }
1230                 if (codec_priv != track->codec_priv.data)
1231                     av_free(codec_priv);
1232             }
1233         }
1234
1235         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1236             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1237                         strlen(ff_mkv_codec_tags[j].str))){
1238                 codec_id= ff_mkv_codec_tags[j].id;
1239                 break;
1240             }
1241         }
1242
1243         st = track->stream = av_new_stream(s, 0);
1244         if (st == NULL)
1245             return AVERROR(ENOMEM);
1246
1247         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1248             && track->codec_priv.size >= 40
1249             && track->codec_priv.data != NULL) {
1250             track->ms_compat = 1;
1251             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1252             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1253             extradata_offset = 40;
1254         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1255                    && track->codec_priv.size >= 14
1256                    && track->codec_priv.data != NULL) {
1257             init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1258                           URL_RDONLY, NULL, NULL, NULL, NULL);
1259             ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1260             codec_id = st->codec->codec_id;
1261             extradata_offset = FFMIN(track->codec_priv.size, 18);
1262         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1263                    && (track->codec_priv.size >= 86)
1264                    && (track->codec_priv.data != NULL)) {
1265             track->video.fourcc = AV_RL32(track->codec_priv.data);
1266             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1267         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1268             switch (track->audio.bitdepth) {
1269             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1270             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1271             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1272             }
1273         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1274             switch (track->audio.bitdepth) {
1275             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1276             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1277             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1278             }
1279         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1280             codec_id = CODEC_ID_PCM_F64LE;
1281         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1282             int profile = matroska_aac_profile(track->codec_id);
1283             int sri = matroska_aac_sri(track->audio.samplerate);
1284             extradata = av_malloc(5);
1285             if (extradata == NULL)
1286                 return AVERROR(ENOMEM);
1287             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1288             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1289             if (strstr(track->codec_id, "SBR")) {
1290                 sri = matroska_aac_sri(track->audio.out_samplerate);
1291                 extradata[2] = 0x56;
1292                 extradata[3] = 0xE5;
1293                 extradata[4] = 0x80 | (sri<<3);
1294                 extradata_size = 5;
1295             } else
1296                 extradata_size = 2;
1297         } else if (codec_id == CODEC_ID_TTA) {
1298             extradata_size = 30;
1299             extradata = av_mallocz(extradata_size);
1300             if (extradata == NULL)
1301                 return AVERROR(ENOMEM);
1302             init_put_byte(&b, extradata, extradata_size, 1,
1303                           NULL, NULL, NULL, NULL);
1304             put_buffer(&b, "TTA1", 4);
1305             put_le16(&b, 1);
1306             put_le16(&b, track->audio.channels);
1307             put_le16(&b, track->audio.bitdepth);
1308             put_le32(&b, track->audio.out_samplerate);
1309             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1310         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1311                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1312             extradata_offset = 26;
1313         } else if (codec_id == CODEC_ID_RA_144) {
1314             track->audio.out_samplerate = 8000;
1315             track->audio.channels = 1;
1316         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1317                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1318             int flavor;
1319             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1320                           0, NULL, NULL, NULL, NULL);
1321             url_fskip(&b, 22);
1322             flavor                       = get_be16(&b);
1323             track->audio.coded_framesize = get_be32(&b);
1324             url_fskip(&b, 12);
1325             track->audio.sub_packet_h    = get_be16(&b);
1326             track->audio.frame_size      = get_be16(&b);
1327             track->audio.sub_packet_size = get_be16(&b);
1328             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1329             if (codec_id == CODEC_ID_RA_288) {
1330                 st->codec->block_align = track->audio.coded_framesize;
1331                 track->codec_priv.size = 0;
1332             } else {
1333                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1334                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1335                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1336                     st->codec->bit_rate = sipr_bit_rate[flavor];
1337                 }
1338                 st->codec->block_align = track->audio.sub_packet_size;
1339                 extradata_offset = 78;
1340             }
1341         }
1342         track->codec_priv.size -= extradata_offset;
1343
1344         if (codec_id == CODEC_ID_NONE)
1345             av_log(matroska->ctx, AV_LOG_INFO,
1346                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1347
1348         if (track->time_scale < 0.01)
1349             track->time_scale = 1.0;
1350         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1351
1352         st->codec->codec_id = codec_id;
1353         st->start_time = 0;
1354         if (strcmp(track->language, "und"))
1355             av_metadata_set(&st->metadata, "language", track->language);
1356         av_metadata_set(&st->metadata, "title", track->name);
1357
1358         if (track->flag_default)
1359             st->disposition |= AV_DISPOSITION_DEFAULT;
1360
1361         if (track->default_duration)
1362             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1363                       track->default_duration, 1000000000, 30000);
1364
1365         if (!st->codec->extradata) {
1366             if(extradata){
1367                 st->codec->extradata = extradata;
1368                 st->codec->extradata_size = extradata_size;
1369             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1370                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1371                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1372                 if(st->codec->extradata == NULL)
1373                     return AVERROR(ENOMEM);
1374                 st->codec->extradata_size = track->codec_priv.size;
1375                 memcpy(st->codec->extradata,
1376                        track->codec_priv.data + extradata_offset,
1377                        track->codec_priv.size);
1378             }
1379         }
1380
1381         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1382             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1383             st->codec->codec_tag  = track->video.fourcc;
1384             st->codec->width  = track->video.pixel_width;
1385             st->codec->height = track->video.pixel_height;
1386             av_reduce(&st->sample_aspect_ratio.num,
1387                       &st->sample_aspect_ratio.den,
1388                       st->codec->height * track->video.display_width,
1389                       st->codec-> width * track->video.display_height,
1390                       255);
1391             if (st->codec->codec_id != CODEC_ID_H264)
1392             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1393         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1394             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1395             st->codec->sample_rate = track->audio.out_samplerate;
1396             st->codec->channels = track->audio.channels;
1397         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1398             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1399         }
1400     }
1401
1402     attachements = attachements_list->elem;
1403     for (j=0; j<attachements_list->nb_elem; j++) {
1404         if (!(attachements[j].filename && attachements[j].mime &&
1405               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1406             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1407         } else {
1408             AVStream *st = av_new_stream(s, 0);
1409             if (st == NULL)
1410                 break;
1411             av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1412             st->codec->codec_id = CODEC_ID_NONE;
1413             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1414             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1415             if(st->codec->extradata == NULL)
1416                 break;
1417             st->codec->extradata_size = attachements[j].bin.size;
1418             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1419
1420             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1421                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1422                              strlen(ff_mkv_mime_tags[i].str))) {
1423                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1424                     break;
1425                 }
1426             }
1427             attachements[j].stream = st;
1428         }
1429     }
1430
1431     chapters = chapters_list->elem;
1432     for (i=0; i<chapters_list->nb_elem; i++)
1433         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1434             && (max_start==0 || chapters[i].start > max_start)) {
1435             chapters[i].chapter =
1436             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1437                            chapters[i].start, chapters[i].end,
1438                            chapters[i].title);
1439             av_metadata_set(&chapters[i].chapter->metadata,
1440                             "title", chapters[i].title);
1441             max_start = chapters[i].start;
1442         }
1443
1444     index_list = &matroska->index;
1445     index = index_list->elem;
1446     if (index_list->nb_elem
1447         && index[0].time > 100000000000000/matroska->time_scale) {
1448         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1449         index_scale = matroska->time_scale;
1450     }
1451     for (i=0; i<index_list->nb_elem; i++) {
1452         EbmlList *pos_list = &index[i].pos;
1453         MatroskaIndexPos *pos = pos_list->elem;
1454         for (j=0; j<pos_list->nb_elem; j++) {
1455             MatroskaTrack *track = matroska_find_track_by_num(matroska,
1456                                                               pos[j].track);
1457             if (track && track->stream)
1458                 av_add_index_entry(track->stream,
1459                                    pos[j].pos + matroska->segment_start,
1460                                    index[i].time/index_scale, 0, 0,
1461                                    AVINDEX_KEYFRAME);
1462         }
1463     }
1464
1465     matroska_convert_tags(s);
1466
1467     return 0;
1468 }
1469
1470 /*
1471  * Put one packet in an application-supplied AVPacket struct.
1472  * Returns 0 on success or -1 on failure.
1473  */
1474 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1475                                    AVPacket *pkt)
1476 {
1477     if (matroska->num_packets > 0) {
1478         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1479         av_free(matroska->packets[0]);
1480         if (matroska->num_packets > 1) {
1481             memmove(&matroska->packets[0], &matroska->packets[1],
1482                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1483             matroska->packets =
1484                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1485                            sizeof(AVPacket *));
1486         } else {
1487             av_freep(&matroska->packets);
1488         }
1489         matroska->num_packets--;
1490         return 0;
1491     }
1492
1493     return -1;
1494 }
1495
1496 /*
1497  * Free all packets in our internal queue.
1498  */
1499 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1500 {
1501     if (matroska->packets) {
1502         int n;
1503         for (n = 0; n < matroska->num_packets; n++) {
1504             av_free_packet(matroska->packets[n]);
1505             av_free(matroska->packets[n]);
1506         }
1507         av_freep(&matroska->packets);
1508         matroska->num_packets = 0;
1509     }
1510 }
1511
1512 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1513                                 int size, int64_t pos, uint64_t cluster_time,
1514                                 uint64_t duration, int is_keyframe,
1515                                 int64_t cluster_pos)
1516 {
1517     uint64_t timecode = AV_NOPTS_VALUE;
1518     MatroskaTrack *track;
1519     int res = 0;
1520     AVStream *st;
1521     AVPacket *pkt;
1522     int16_t block_time;
1523     uint32_t *lace_size = NULL;
1524     int n, flags, laces = 0;
1525     uint64_t num;
1526
1527     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1528         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1529         return res;
1530     }
1531     data += n;
1532     size -= n;
1533
1534     track = matroska_find_track_by_num(matroska, num);
1535     if (size <= 3 || !track || !track->stream) {
1536         av_log(matroska->ctx, AV_LOG_INFO,
1537                "Invalid stream %"PRIu64" or size %u\n", num, size);
1538         return res;
1539     }
1540     st = track->stream;
1541     if (st->discard >= AVDISCARD_ALL)
1542         return res;
1543     if (duration == AV_NOPTS_VALUE)
1544         duration = track->default_duration / matroska->time_scale;
1545
1546     block_time = AV_RB16(data);
1547     data += 2;
1548     flags = *data++;
1549     size -= 3;
1550     if (is_keyframe == -1)
1551         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1552
1553     if (cluster_time != (uint64_t)-1
1554         && (block_time >= 0 || cluster_time >= -block_time)) {
1555         timecode = cluster_time + block_time;
1556         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1557             && timecode < track->end_timecode)
1558             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1559         if (is_keyframe)
1560             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1561         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1562     }
1563
1564     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1565         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1566             return res;
1567         matroska->skip_to_keyframe = 0;
1568     }
1569
1570     switch ((flags & 0x06) >> 1) {
1571         case 0x0: /* no lacing */
1572             laces = 1;
1573             lace_size = av_mallocz(sizeof(int));
1574             lace_size[0] = size;
1575             break;
1576
1577         case 0x1: /* Xiph lacing */
1578         case 0x2: /* fixed-size lacing */
1579         case 0x3: /* EBML lacing */
1580             assert(size>0); // size <=3 is checked before size-=3 above
1581             laces = (*data) + 1;
1582             data += 1;
1583             size -= 1;
1584             lace_size = av_mallocz(laces * sizeof(int));
1585
1586             switch ((flags & 0x06) >> 1) {
1587                 case 0x1: /* Xiph lacing */ {
1588                     uint8_t temp;
1589                     uint32_t total = 0;
1590                     for (n = 0; res == 0 && n < laces - 1; n++) {
1591                         while (1) {
1592                             if (size == 0) {
1593                                 res = -1;
1594                                 break;
1595                             }
1596                             temp = *data;
1597                             lace_size[n] += temp;
1598                             data += 1;
1599                             size -= 1;
1600                             if (temp != 0xff)
1601                                 break;
1602                         }
1603                         total += lace_size[n];
1604                     }
1605                     lace_size[n] = size - total;
1606                     break;
1607                 }
1608
1609                 case 0x2: /* fixed-size lacing */
1610                     for (n = 0; n < laces; n++)
1611                         lace_size[n] = size / laces;
1612                     break;
1613
1614                 case 0x3: /* EBML lacing */ {
1615                     uint32_t total;
1616                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1617                     if (n < 0) {
1618                         av_log(matroska->ctx, AV_LOG_INFO,
1619                                "EBML block data error\n");
1620                         break;
1621                     }
1622                     data += n;
1623                     size -= n;
1624                     total = lace_size[0] = num;
1625                     for (n = 1; res == 0 && n < laces - 1; n++) {
1626                         int64_t snum;
1627                         int r;
1628                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1629                         if (r < 0) {
1630                             av_log(matroska->ctx, AV_LOG_INFO,
1631                                    "EBML block data error\n");
1632                             break;
1633                         }
1634                         data += r;
1635                         size -= r;
1636                         lace_size[n] = lace_size[n - 1] + snum;
1637                         total += lace_size[n];
1638                     }
1639                     lace_size[n] = size - total;
1640                     break;
1641                 }
1642             }
1643             break;
1644     }
1645
1646     if (res == 0) {
1647         for (n = 0; n < laces; n++) {
1648             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1649                  st->codec->codec_id == CODEC_ID_COOK ||
1650                  st->codec->codec_id == CODEC_ID_SIPR ||
1651                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1652                  st->codec->block_align && track->audio.sub_packet_size) {
1653                 int a = st->codec->block_align;
1654                 int sps = track->audio.sub_packet_size;
1655                 int cfs = track->audio.coded_framesize;
1656                 int h = track->audio.sub_packet_h;
1657                 int y = track->audio.sub_packet_cnt;
1658                 int w = track->audio.frame_size;
1659                 int x;
1660
1661                 if (!track->audio.pkt_cnt) {
1662                     if (st->codec->codec_id == CODEC_ID_RA_288)
1663                         for (x=0; x<h/2; x++)
1664                             memcpy(track->audio.buf+x*2*w+y*cfs,
1665                                    data+x*cfs, cfs);
1666                     else if (st->codec->codec_id == CODEC_ID_SIPR)
1667                         memcpy(track->audio.buf + y*w, data, w);
1668                     else
1669                         for (x=0; x<w/sps; x++)
1670                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1671
1672                     if (++track->audio.sub_packet_cnt >= h) {
1673                         if (st->codec->codec_id == CODEC_ID_SIPR)
1674                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1675                         track->audio.sub_packet_cnt = 0;
1676                         track->audio.pkt_cnt = h*w / a;
1677                     }
1678                 }
1679                 while (track->audio.pkt_cnt) {
1680                     pkt = av_mallocz(sizeof(AVPacket));
1681                     av_new_packet(pkt, a);
1682                     memcpy(pkt->data, track->audio.buf
1683                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1684                     pkt->pos = pos;
1685                     pkt->stream_index = st->index;
1686                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1687                 }
1688             } else {
1689                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1690                 int offset = 0, pkt_size = lace_size[n];
1691                 uint8_t *pkt_data = data;
1692
1693                 if (lace_size[n] > size) {
1694                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1695                     break;
1696                 }
1697
1698                 if (encodings && encodings->scope & 1) {
1699                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1700                     if (offset < 0)
1701                         continue;
1702                 }
1703
1704                 pkt = av_mallocz(sizeof(AVPacket));
1705                 /* XXX: prevent data copy... */
1706                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1707                     av_free(pkt);
1708                     res = AVERROR(ENOMEM);
1709                     break;
1710                 }
1711                 if (offset)
1712                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1713                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1714
1715                 if (pkt_data != data)
1716                     av_free(pkt_data);
1717
1718                 if (n == 0)
1719                     pkt->flags = is_keyframe;
1720                 pkt->stream_index = st->index;
1721
1722                 if (track->ms_compat)
1723                     pkt->dts = timecode;
1724                 else
1725                     pkt->pts = timecode;
1726                 pkt->pos = pos;
1727                 if (st->codec->codec_id == CODEC_ID_TEXT)
1728                     pkt->convergence_duration = duration;
1729                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1730                     pkt->duration = duration;
1731
1732                 if (st->codec->codec_id == CODEC_ID_SSA)
1733                     matroska_fix_ass_packet(matroska, pkt, duration);
1734
1735                 if (matroska->prev_pkt &&
1736                     timecode != AV_NOPTS_VALUE &&
1737                     matroska->prev_pkt->pts == timecode &&
1738                     matroska->prev_pkt->stream_index == st->index)
1739                     matroska_merge_packets(matroska->prev_pkt, pkt);
1740                 else {
1741                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1742                     matroska->prev_pkt = pkt;
1743                 }
1744             }
1745
1746             if (timecode != AV_NOPTS_VALUE)
1747                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1748             data += lace_size[n];
1749             size -= lace_size[n];
1750         }
1751     }
1752
1753     av_free(lace_size);
1754     return res;
1755 }
1756
1757 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1758 {
1759     MatroskaCluster cluster = { 0 };
1760     EbmlList *blocks_list;
1761     MatroskaBlock *blocks;
1762     int i, res;
1763     int64_t pos = url_ftell(matroska->ctx->pb);
1764     matroska->prev_pkt = NULL;
1765     if (matroska->has_cluster_id){
1766         /* For the first cluster we parse, its ID was already read as
1767            part of matroska_read_header(), so don't read it again */
1768         res = ebml_parse_id(matroska, matroska_clusters,
1769                             MATROSKA_ID_CLUSTER, &cluster);
1770         pos -= 4;  /* sizeof the ID which was already read */
1771         matroska->has_cluster_id = 0;
1772     } else
1773         res = ebml_parse(matroska, matroska_clusters, &cluster);
1774     blocks_list = &cluster.blocks;
1775     blocks = blocks_list->elem;
1776     for (i=0; i<blocks_list->nb_elem; i++)
1777         if (blocks[i].bin.size > 0) {
1778             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1779             res=matroska_parse_block(matroska,
1780                                      blocks[i].bin.data, blocks[i].bin.size,
1781                                      blocks[i].bin.pos,  cluster.timecode,
1782                                      blocks[i].duration, is_keyframe,
1783                                      pos);
1784         }
1785     ebml_free(matroska_cluster, &cluster);
1786     if (res < 0)  matroska->done = 1;
1787     return res;
1788 }
1789
1790 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1791 {
1792     MatroskaDemuxContext *matroska = s->priv_data;
1793
1794     while (matroska_deliver_packet(matroska, pkt)) {
1795         if (matroska->done)
1796             return AVERROR_EOF;
1797         matroska_parse_cluster(matroska);
1798     }
1799
1800     return 0;
1801 }
1802
1803 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1804                               int64_t timestamp, int flags)
1805 {
1806     MatroskaDemuxContext *matroska = s->priv_data;
1807     MatroskaTrack *tracks = matroska->tracks.elem;
1808     AVStream *st = s->streams[stream_index];
1809     int i, index, index_sub, index_min;
1810
1811     if (!st->nb_index_entries)
1812         return 0;
1813     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1814
1815     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1816         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1817         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1818             matroska_clear_queue(matroska);
1819             if (matroska_parse_cluster(matroska) < 0)
1820                 break;
1821         }
1822     }
1823
1824     matroska_clear_queue(matroska);
1825     if (index < 0)
1826         return 0;
1827
1828     index_min = index;
1829     for (i=0; i < matroska->tracks.nb_elem; i++) {
1830         tracks[i].end_timecode = 0;
1831         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1832             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1833             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1834             if (index_sub >= 0
1835                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1836                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1837                 index_min = index_sub;
1838         }
1839     }
1840
1841     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1842     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1843     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1844     matroska->done = 0;
1845     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1846     return 0;
1847 }
1848
1849 static int matroska_read_close(AVFormatContext *s)
1850 {
1851     MatroskaDemuxContext *matroska = s->priv_data;
1852     MatroskaTrack *tracks = matroska->tracks.elem;
1853     int n;
1854
1855     matroska_clear_queue(matroska);
1856
1857     for (n=0; n < matroska->tracks.nb_elem; n++)
1858         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1859             av_free(tracks[n].audio.buf);
1860     ebml_free(matroska_segment, matroska);
1861
1862     return 0;
1863 }
1864
1865 AVInputFormat matroska_demuxer = {
1866     "matroska",
1867     NULL_IF_CONFIG_SMALL("Matroska file format"),
1868     sizeof(MatroskaDemuxContext),
1869     matroska_probe,
1870     matroska_read_header,
1871     matroska_read_packet,
1872     matroska_read_close,
1873     matroska_read_seek,
1874     .metadata_conv = ff_mkv_metadata_conv,
1875 };