5a79712f05ff34e13d429e593c7f8af2b6648d56
[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 matroskadec.c
24  * Matroska file demuxer
25  * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26  * with a little help from Moritz Bunkus <moritz@bunkus.org>
27  * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28  * Specs available on the Matroska project page: http://www.matroska.org/.
29  */
30
31 #include <stdio.h>
32 #include "avformat.h"
33 /* For codec_get_id(). */
34 #include "riff.h"
35 #include "isom.h"
36 #include "matroska.h"
37 #include "libavcodec/mpeg4audio.h"
38 #include "libavutil/intfloat_readwrite.h"
39 #include "libavutil/avstring.h"
40 #include "libavutil/lzo.h"
41 #ifdef CONFIG_ZLIB
42 #include <zlib.h>
43 #endif
44 #ifdef CONFIG_BZLIB
45 #include <bzlib.h>
46 #endif
47
48 typedef enum {
49     EBML_NONE,
50     EBML_UINT,
51     EBML_FLOAT,
52     EBML_STR,
53     EBML_UTF8,
54     EBML_BIN,
55     EBML_NEST,
56     EBML_PASS,
57     EBML_STOP,
58 } EbmlType;
59
60 typedef const struct EbmlSyntax {
61     uint32_t id;
62     EbmlType type;
63     int list_elem_size;
64     int data_offset;
65     union {
66         uint64_t    u;
67         double      f;
68         const char *s;
69         const struct EbmlSyntax *n;
70     } def;
71 } EbmlSyntax;
72
73 typedef struct {
74     int nb_elem;
75     void *elem;
76 } EbmlList;
77
78 typedef struct {
79     int      size;
80     uint8_t *data;
81     int64_t  pos;
82 } EbmlBin;
83
84 typedef struct {
85     uint64_t version;
86     uint64_t max_size;
87     uint64_t id_length;
88     char    *doctype;
89     uint64_t doctype_version;
90 } Ebml;
91
92 typedef struct {
93     uint64_t algo;
94     EbmlBin  settings;
95 } MatroskaTrackCompression;
96
97 typedef struct {
98     uint64_t scope;
99     uint64_t type;
100     MatroskaTrackCompression compression;
101 } MatroskaTrackEncoding;
102
103 typedef struct {
104     double   frame_rate;
105     uint64_t display_width;
106     uint64_t display_height;
107     uint64_t pixel_width;
108     uint64_t pixel_height;
109     uint64_t fourcc;
110 } MatroskaTrackVideo;
111
112 typedef struct {
113     double   samplerate;
114     double   out_samplerate;
115     uint64_t bitdepth;
116     uint64_t channels;
117
118     /* real audio header (extracted from extradata) */
119     int      coded_framesize;
120     int      sub_packet_h;
121     int      frame_size;
122     int      sub_packet_size;
123     int      sub_packet_cnt;
124     int      pkt_cnt;
125     uint8_t *buf;
126 } MatroskaTrackAudio;
127
128 typedef struct {
129     uint64_t num;
130     uint64_t type;
131     char    *codec_id;
132     EbmlBin  codec_priv;
133     char    *language;
134     double time_scale;
135     uint64_t default_duration;
136     uint64_t flag_default;
137     MatroskaTrackVideo video;
138     MatroskaTrackAudio audio;
139     EbmlList encodings;
140
141     AVStream *stream;
142     int64_t end_timecode;
143 } MatroskaTrack;
144
145 typedef struct {
146     char *filename;
147     char *mime;
148     EbmlBin bin;
149 } MatroskaAttachement;
150
151 typedef struct {
152     uint64_t start;
153     uint64_t end;
154     uint64_t uid;
155     char    *title;
156 } MatroskaChapter;
157
158 typedef struct {
159     uint64_t track;
160     uint64_t pos;
161 } MatroskaIndexPos;
162
163 typedef struct {
164     uint64_t time;
165     EbmlList pos;
166 } MatroskaIndex;
167
168 typedef struct {
169     char *name;
170     char *string;
171     EbmlList sub;
172 } MatroskaTag;
173
174 typedef struct {
175     uint64_t id;
176     uint64_t pos;
177 } MatroskaSeekhead;
178
179 typedef struct {
180     uint64_t start;
181     uint64_t length;
182 } MatroskaLevel;
183
184 typedef struct {
185     AVFormatContext *ctx;
186
187     /* EBML stuff */
188     int num_levels;
189     MatroskaLevel levels[EBML_MAX_DEPTH];
190     int level_up;
191
192     uint64_t time_scale;
193     double   duration;
194     char    *title;
195     EbmlList tracks;
196     EbmlList attachments;
197     EbmlList chapters;
198     EbmlList index;
199     EbmlList tags;
200     EbmlList seekhead;
201
202     /* byte position of the segment inside the stream */
203     int64_t segment_start;
204
205     /* the packet queue */
206     AVPacket **packets;
207     int num_packets;
208     AVPacket *prev_pkt;
209
210     int done;
211     int has_cluster_id;
212
213     /* What to skip before effectively reading a packet. */
214     int skip_to_keyframe;
215     uint64_t skip_to_timecode;
216 } MatroskaDemuxContext;
217
218 typedef struct {
219     uint64_t duration;
220     int64_t  reference;
221     EbmlBin  bin;
222 } MatroskaBlock;
223
224 typedef struct {
225     uint64_t timecode;
226     EbmlList blocks;
227 } MatroskaCluster;
228
229 static EbmlSyntax ebml_header[] = {
230     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
231     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
232     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
233     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
234     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
235     { EBML_ID_EBMLVERSION,            EBML_NONE },
236     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
237     { 0 }
238 };
239
240 static EbmlSyntax ebml_syntax[] = {
241     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
242     { 0 }
243 };
244
245 static EbmlSyntax matroska_info[] = {
246     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
247     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
248     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
249     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
250     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
251     { MATROSKA_ID_DATEUTC,            EBML_NONE },
252     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
253     { 0 }
254 };
255
256 static EbmlSyntax matroska_track_video[] = {
257     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
258     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
259     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
260     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
261     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
262     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
263     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
264     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
265     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
266     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
267     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
268     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
269     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
270     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
271     { 0 }
272 };
273
274 static EbmlSyntax matroska_track_audio[] = {
275     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
276     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
277     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
278     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
279     { 0 }
280 };
281
282 static EbmlSyntax matroska_track_encoding_compression[] = {
283     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
284     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
285     { 0 }
286 };
287
288 static EbmlSyntax matroska_track_encoding[] = {
289     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
290     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
291     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
292     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
293     { 0 }
294 };
295
296 static EbmlSyntax matroska_track_encodings[] = {
297     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
298     { 0 }
299 };
300
301 static EbmlSyntax matroska_track[] = {
302     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
303     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
304     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
305     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
306     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
307     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
308     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
309     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
310     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
311     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
312     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
313     { MATROSKA_ID_TRACKUID,             EBML_NONE },
314     { MATROSKA_ID_TRACKNAME,            EBML_NONE },
315     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
316     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
317     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
318     { MATROSKA_ID_CODECNAME,            EBML_NONE },
319     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
320     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
321     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
322     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
323     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
324     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
325     { 0 }
326 };
327
328 static EbmlSyntax matroska_tracks[] = {
329     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
330     { 0 }
331 };
332
333 static EbmlSyntax matroska_attachment[] = {
334     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
335     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
336     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
337     { MATROSKA_ID_FILEDESC,           EBML_NONE },
338     { MATROSKA_ID_FILEUID,            EBML_NONE },
339     { 0 }
340 };
341
342 static EbmlSyntax matroska_attachments[] = {
343     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
344     { 0 }
345 };
346
347 static EbmlSyntax matroska_chapter_display[] = {
348     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
349     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
350     { 0 }
351 };
352
353 static EbmlSyntax matroska_chapter_entry[] = {
354     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
355     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
356     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
357     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
358     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
359     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
360     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
361     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
362     { 0 }
363 };
364
365 static EbmlSyntax matroska_chapter[] = {
366     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
367     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
368     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
369     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
370     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
371     { 0 }
372 };
373
374 static EbmlSyntax matroska_chapters[] = {
375     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
376     { 0 }
377 };
378
379 static EbmlSyntax matroska_index_pos[] = {
380     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
381     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
382     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
383     { 0 }
384 };
385
386 static EbmlSyntax matroska_index_entry[] = {
387     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
388     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
389     { 0 }
390 };
391
392 static EbmlSyntax matroska_index[] = {
393     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
394     { 0 }
395 };
396
397 static EbmlSyntax matroska_simpletag[] = {
398     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
399     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
400     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
401     { MATROSKA_ID_TAGLANG,            EBML_NONE },
402     { MATROSKA_ID_TAGDEFAULT,         EBML_NONE },
403     { 0 }
404 };
405
406 static EbmlSyntax matroska_tag[] = {
407     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
408     { MATROSKA_ID_TAGTARGETS,         EBML_NONE },
409     { 0 }
410 };
411
412 static EbmlSyntax matroska_tags[] = {
413     { MATROSKA_ID_TAG,                EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
414     { 0 }
415 };
416
417 static EbmlSyntax matroska_seekhead_entry[] = {
418     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
419     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
420     { 0 }
421 };
422
423 static EbmlSyntax matroska_seekhead[] = {
424     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
425     { 0 }
426 };
427
428 static EbmlSyntax matroska_segment[] = {
429     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
430     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
431     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
432     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
433     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
434     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
435     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
436     { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
437     { 0 }
438 };
439
440 static EbmlSyntax matroska_segments[] = {
441     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
442     { 0 }
443 };
444
445 static EbmlSyntax matroska_blockgroup[] = {
446     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
447     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
448     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
449     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
450     { 0 }
451 };
452
453 static EbmlSyntax matroska_cluster[] = {
454     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
455     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
456     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
457     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
458     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
459     { 0 }
460 };
461
462 static EbmlSyntax matroska_clusters[] = {
463     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
464     { MATROSKA_ID_INFO,           EBML_NONE },
465     { MATROSKA_ID_CUES,           EBML_NONE },
466     { MATROSKA_ID_TAGS,           EBML_NONE },
467     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
468     { 0 }
469 };
470
471 #define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
472 const struct {
473     const char name[16];
474     int   size;
475     int   offset;
476 } metadata[] = {
477     { "TITLE",           SIZE_OFF(title)      },
478     { "ARTIST",          SIZE_OFF(author)     },
479     { "WRITTEN_BY",      SIZE_OFF(author)     },
480     { "LEAD_PERFORMER",  SIZE_OFF(author)     },
481     { "COPYRIGHT",       SIZE_OFF(copyright)  },
482     { "COMMENT",         SIZE_OFF(comment)    },
483     { "ALBUM",           SIZE_OFF(album)      },
484     { "DATE_WRITTEN",    SIZE_OFF(year)       },
485     { "DATE_RELEASED",   SIZE_OFF(year)       },
486     { "PART_NUMBER",     SIZE_OFF(track)      },
487     { "GENRE",           SIZE_OFF(genre)      },
488 };
489
490 /*
491  * Return: Whether we reached the end of a level in the hierarchy or not.
492  */
493 static int ebml_level_end(MatroskaDemuxContext *matroska)
494 {
495     ByteIOContext *pb = matroska->ctx->pb;
496     int64_t pos = url_ftell(pb);
497
498     if (matroska->num_levels > 0) {
499         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
500         if (pos - level->start >= level->length) {
501             matroska->num_levels--;
502             return 1;
503         }
504     }
505     return 0;
506 }
507
508 /*
509  * Read: an "EBML number", which is defined as a variable-length
510  * array of bytes. The first byte indicates the length by giving a
511  * number of 0-bits followed by a one. The position of the first
512  * "one" bit inside the first byte indicates the length of this
513  * number.
514  * Returns: number of bytes read, < 0 on error
515  */
516 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
517                          int max_size, uint64_t *number)
518 {
519     int len_mask = 0x80, read = 1, n = 1;
520     int64_t total = 0;
521
522     /* The first byte tells us the length in bytes - get_byte() can normally
523      * return 0, but since that's not a valid first ebmlID byte, we can
524      * use it safely here to catch EOS. */
525     if (!(total = get_byte(pb))) {
526         /* we might encounter EOS here */
527         if (!url_feof(pb)) {
528             int64_t pos = url_ftell(pb);
529             av_log(matroska->ctx, AV_LOG_ERROR,
530                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
531                    pos, pos);
532         }
533         return AVERROR(EIO); /* EOS or actual I/O error */
534     }
535
536     /* get the length of the EBML number */
537     while (read <= max_size && !(total & len_mask)) {
538         read++;
539         len_mask >>= 1;
540     }
541     if (read > max_size) {
542         int64_t pos = url_ftell(pb) - 1;
543         av_log(matroska->ctx, AV_LOG_ERROR,
544                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
545                (uint8_t) total, pos, pos);
546         return AVERROR_INVALIDDATA;
547     }
548
549     /* read out length */
550     total &= ~len_mask;
551     while (n++ < read)
552         total = (total << 8) | get_byte(pb);
553
554     *number = total;
555
556     return read;
557 }
558
559 /*
560  * Read the next element as an unsigned int.
561  * 0 is success, < 0 is failure.
562  */
563 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
564 {
565     int n = 0;
566
567     if (size < 1 || size > 8)
568         return AVERROR_INVALIDDATA;
569
570     /* big-endian ordering; build up number */
571     *num = 0;
572     while (n++ < size)
573         *num = (*num << 8) | get_byte(pb);
574
575     return 0;
576 }
577
578 /*
579  * Read the next element as a float.
580  * 0 is success, < 0 is failure.
581  */
582 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
583 {
584     if (size == 4) {
585         *num= av_int2flt(get_be32(pb));
586     } else if(size==8){
587         *num= av_int2dbl(get_be64(pb));
588     } else
589         return AVERROR_INVALIDDATA;
590
591     return 0;
592 }
593
594 /*
595  * Read the next element as an ASCII string.
596  * 0 is success, < 0 is failure.
597  */
598 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
599 {
600     av_free(*str);
601     /* EBML strings are usually not 0-terminated, so we allocate one
602      * byte more, read the string and NULL-terminate it ourselves. */
603     if (!(*str = av_malloc(size + 1)))
604         return AVERROR(ENOMEM);
605     if (get_buffer(pb, (uint8_t *) *str, size) != size) {
606         av_free(*str);
607         return AVERROR(EIO);
608     }
609     (*str)[size] = '\0';
610
611     return 0;
612 }
613
614 /*
615  * Read the next element as binary data.
616  * 0 is success, < 0 is failure.
617  */
618 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
619 {
620     av_free(bin->data);
621     if (!(bin->data = av_malloc(length)))
622         return AVERROR(ENOMEM);
623
624     bin->size = length;
625     bin->pos  = url_ftell(pb);
626     if (get_buffer(pb, bin->data, length) != length)
627         return AVERROR(EIO);
628
629     return 0;
630 }
631
632 /*
633  * Read the next element, but only the header. The contents
634  * are supposed to be sub-elements which can be read separately.
635  * 0 is success, < 0 is failure.
636  */
637 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
638 {
639     ByteIOContext *pb = matroska->ctx->pb;
640     MatroskaLevel *level;
641
642     if (matroska->num_levels >= EBML_MAX_DEPTH) {
643         av_log(matroska->ctx, AV_LOG_ERROR,
644                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
645         return AVERROR(ENOSYS);
646     }
647
648     level = &matroska->levels[matroska->num_levels++];
649     level->start = url_ftell(pb);
650     level->length = length;
651
652     return 0;
653 }
654
655 /*
656  * Read signed/unsigned "EBML" numbers.
657  * Return: number of bytes processed, < 0 on error
658  */
659 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
660                                  uint8_t *data, uint32_t size, uint64_t *num)
661 {
662     ByteIOContext pb;
663     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
664     return ebml_read_num(matroska, &pb, 8, num);
665 }
666
667 /*
668  * Same as above, but signed.
669  */
670 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
671                                  uint8_t *data, uint32_t size, int64_t *num)
672 {
673     uint64_t unum;
674     int res;
675
676     /* read as unsigned number first */
677     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
678         return res;
679
680     /* make signed (weird way) */
681     *num = unum - ((1LL << (7*res - 1)) - 1);
682
683     return res;
684 }
685
686 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
687                            EbmlSyntax *syntax, void *data);
688
689 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
690                          uint32_t id, void *data)
691 {
692     int i;
693     for (i=0; syntax[i].id; i++)
694         if (id == syntax[i].id)
695             break;
696     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
697         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
698     return ebml_parse_elem(matroska, &syntax[i], data);
699 }
700
701 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
702                       void *data)
703 {
704     uint64_t id;
705     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
706     id |= 1 << 7*res;
707     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
708 }
709
710 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
711                            void *data)
712 {
713     int i, res = 0;
714
715     for (i=0; syntax[i].id; i++)
716         switch (syntax[i].type) {
717         case EBML_UINT:
718             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
719             break;
720         case EBML_FLOAT:
721             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
722             break;
723         case EBML_STR:
724         case EBML_UTF8:
725             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
726             break;
727         }
728
729     while (!res && !ebml_level_end(matroska))
730         res = ebml_parse(matroska, syntax, data);
731
732     return res;
733 }
734
735 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
736                            EbmlSyntax *syntax, void *data)
737 {
738     ByteIOContext *pb = matroska->ctx->pb;
739     uint32_t id = syntax->id;
740     uint64_t length;
741     int res;
742
743     data = (char *)data + syntax->data_offset;
744     if (syntax->list_elem_size) {
745         EbmlList *list = data;
746         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
747         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
748         memset(data, 0, syntax->list_elem_size);
749         list->nb_elem++;
750     }
751
752     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
753         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
754             return res;
755
756     switch (syntax->type) {
757     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
758     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
759     case EBML_STR:
760     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
761     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
762     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
763                          return res;
764                      if (id == MATROSKA_ID_SEGMENT)
765                          matroska->segment_start = url_ftell(matroska->ctx->pb);
766                      return ebml_parse_nest(matroska, syntax->def.n, data);
767     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
768     case EBML_STOP:  *(int *)data = 1;      return 1;
769     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
770     }
771     if (res == AVERROR_INVALIDDATA)
772         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
773     else if (res == AVERROR(EIO))
774         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
775     return res;
776 }
777
778 static void ebml_free(EbmlSyntax *syntax, void *data)
779 {
780     int i, j;
781     for (i=0; syntax[i].id; i++) {
782         void *data_off = (char *)data + syntax[i].data_offset;
783         switch (syntax[i].type) {
784         case EBML_STR:
785         case EBML_UTF8:  av_freep(data_off);                      break;
786         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
787         case EBML_NEST:
788             if (syntax[i].list_elem_size) {
789                 EbmlList *list = data_off;
790                 char *ptr = list->elem;
791                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
792                     ebml_free(syntax[i].def.n, ptr);
793                 av_free(list->elem);
794             } else
795                 ebml_free(syntax[i].def.n, data_off);
796         default:  break;
797         }
798     }
799 }
800
801
802 /*
803  * Autodetecting...
804  */
805 static int matroska_probe(AVProbeData *p)
806 {
807     uint64_t total = 0;
808     int len_mask = 0x80, size = 1, n = 1;
809     static const char probe_data[] = "matroska";
810
811     /* EBML header? */
812     if (AV_RB32(p->buf) != EBML_ID_HEADER)
813         return 0;
814
815     /* length of header */
816     total = p->buf[4];
817     while (size <= 8 && !(total & len_mask)) {
818         size++;
819         len_mask >>= 1;
820     }
821     if (size > 8)
822       return 0;
823     total &= (len_mask - 1);
824     while (n < size)
825         total = (total << 8) | p->buf[4 + n++];
826
827     /* Does the probe data contain the whole header? */
828     if (p->buf_size < 4 + size + total)
829       return 0;
830
831     /* The header must contain the document type 'matroska'. For now,
832      * we don't parse the whole header but simply check for the
833      * availability of that array of characters inside the header.
834      * Not fully fool-proof, but good enough. */
835     for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
836         if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
837             return AVPROBE_SCORE_MAX;
838
839     return 0;
840 }
841
842 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
843                                                  int num)
844 {
845     MatroskaTrack *tracks = matroska->tracks.elem;
846     int i;
847
848     for (i=0; i < matroska->tracks.nb_elem; i++)
849         if (tracks[i].num == num)
850             return &tracks[i];
851
852     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
853     return NULL;
854 }
855
856 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
857                                   MatroskaTrack *track)
858 {
859     MatroskaTrackEncoding *encodings = track->encodings.elem;
860     uint8_t* data = *buf;
861     int isize = *buf_size;
862     uint8_t* pkt_data = NULL;
863     int pkt_size = isize;
864     int result = 0;
865     int olen;
866
867     switch (encodings[0].compression.algo) {
868     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
869         return encodings[0].compression.settings.size;
870     case MATROSKA_TRACK_ENCODING_COMP_LZO:
871         do {
872             olen = pkt_size *= 3;
873             pkt_data = av_realloc(pkt_data,
874                                   pkt_size+LZO_OUTPUT_PADDING);
875             result = lzo1x_decode(pkt_data, &olen, data, &isize);
876         } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
877         if (result)
878             goto failed;
879         pkt_size -= olen;
880         break;
881 #ifdef CONFIG_ZLIB
882     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
883         z_stream zstream = {0};
884         if (inflateInit(&zstream) != Z_OK)
885             return -1;
886         zstream.next_in = data;
887         zstream.avail_in = isize;
888         do {
889             pkt_size *= 3;
890             pkt_data = av_realloc(pkt_data, pkt_size);
891             zstream.avail_out = pkt_size - zstream.total_out;
892             zstream.next_out = pkt_data + zstream.total_out;
893             result = inflate(&zstream, Z_NO_FLUSH);
894         } while (result==Z_OK && pkt_size<10000000);
895         pkt_size = zstream.total_out;
896         inflateEnd(&zstream);
897         if (result != Z_STREAM_END)
898             goto failed;
899         break;
900     }
901 #endif
902 #ifdef CONFIG_BZLIB
903     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
904         bz_stream bzstream = {0};
905         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
906             return -1;
907         bzstream.next_in = data;
908         bzstream.avail_in = isize;
909         do {
910             pkt_size *= 3;
911             pkt_data = av_realloc(pkt_data, pkt_size);
912             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
913             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
914             result = BZ2_bzDecompress(&bzstream);
915         } while (result==BZ_OK && pkt_size<10000000);
916         pkt_size = bzstream.total_out_lo32;
917         BZ2_bzDecompressEnd(&bzstream);
918         if (result != BZ_STREAM_END)
919             goto failed;
920         break;
921     }
922 #endif
923     default:
924         return -1;
925     }
926
927     *buf = pkt_data;
928     *buf_size = pkt_size;
929     return 0;
930  failed:
931     av_free(pkt_data);
932     return -1;
933 }
934
935 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
936                                     AVPacket *pkt, uint64_t display_duration)
937 {
938     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
939     for (; *ptr!=',' && ptr<end-1; ptr++);
940     if (*ptr == ',')
941         layer = ++ptr;
942     for (; *ptr!=',' && ptr<end-1; ptr++);
943     if (*ptr == ',') {
944         int64_t end_pts = pkt->pts + display_duration;
945         int sc = matroska->time_scale * pkt->pts / 10000000;
946         int ec = matroska->time_scale * end_pts  / 10000000;
947         int sh, sm, ss, eh, em, es, len;
948         sh = sc/360000;  sc -= 360000*sh;
949         sm = sc/  6000;  sc -=   6000*sm;
950         ss = sc/   100;  sc -=    100*ss;
951         eh = ec/360000;  ec -= 360000*eh;
952         em = ec/  6000;  ec -=   6000*em;
953         es = ec/   100;  ec -=    100*es;
954         *ptr++ = '\0';
955         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
956         if (!(line = av_malloc(len)))
957             return;
958         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
959                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
960         av_free(pkt->data);
961         pkt->data = line;
962         pkt->size = strlen(line);
963     }
964 }
965
966 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
967 {
968     out->data = av_realloc(out->data, out->size+in->size);
969     memcpy(out->data+out->size, in->data, in->size);
970     out->size += in->size;
971     av_destruct_packet(in);
972     av_free(in);
973 }
974
975 static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
976 {
977     MatroskaTag *tags = list->elem;
978     int i, j;
979
980     for (i=0; i < list->nb_elem; i++) {
981         for (j=0; j < FF_ARRAY_ELEMS(metadata); j++){
982             if (!strcmp(tags[i].name, metadata[j].name)) {
983                 int *ptr = (int *)((char *)s + metadata[j].offset);
984                 if (*ptr)  continue;
985                 if (metadata[j].size > sizeof(int))
986                     av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
987                 else
988                     *ptr = atoi(tags[i].string);
989             }
990         }
991         if (tags[i].sub.nb_elem)
992             matroska_convert_tags(s, &tags[i].sub);
993     }
994 }
995
996 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
997 {
998     EbmlList *seekhead_list = &matroska->seekhead;
999     MatroskaSeekhead *seekhead = seekhead_list->elem;
1000     uint32_t level_up = matroska->level_up;
1001     int64_t before_pos = url_ftell(matroska->ctx->pb);
1002     MatroskaLevel level;
1003     int i;
1004
1005     for (i=0; i<seekhead_list->nb_elem; i++) {
1006         int64_t offset = seekhead[i].pos + matroska->segment_start;
1007
1008         if (seekhead[i].pos <= before_pos
1009             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1010             || seekhead[i].id == MATROSKA_ID_CLUSTER)
1011             continue;
1012
1013         /* seek */
1014         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1015             continue;
1016
1017         /* We don't want to lose our seekhead level, so we add
1018          * a dummy. This is a crude hack. */
1019         if (matroska->num_levels == EBML_MAX_DEPTH) {
1020             av_log(matroska->ctx, AV_LOG_INFO,
1021                    "Max EBML element depth (%d) reached, "
1022                    "cannot parse further.\n", EBML_MAX_DEPTH);
1023             break;
1024         }
1025
1026         level.start = 0;
1027         level.length = (uint64_t)-1;
1028         matroska->levels[matroska->num_levels] = level;
1029         matroska->num_levels++;
1030
1031         ebml_parse(matroska, matroska_segment, matroska);
1032
1033         /* remove dummy level */
1034         while (matroska->num_levels) {
1035             uint64_t length = matroska->levels[--matroska->num_levels].length;
1036             if (length == (uint64_t)-1)
1037                 break;
1038         }
1039     }
1040
1041     /* seek back */
1042     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1043     matroska->level_up = level_up;
1044 }
1045
1046 static int matroska_aac_profile(char *codec_id)
1047 {
1048     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1049     int profile;
1050
1051     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1052         if (strstr(codec_id, aac_profiles[profile]))
1053             break;
1054     return profile + 1;
1055 }
1056
1057 static int matroska_aac_sri(int samplerate)
1058 {
1059     int sri;
1060
1061     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1062         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1063             break;
1064     return sri;
1065 }
1066
1067 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1068 {
1069     MatroskaDemuxContext *matroska = s->priv_data;
1070     EbmlList *attachements_list = &matroska->attachments;
1071     MatroskaAttachement *attachements;
1072     EbmlList *chapters_list = &matroska->chapters;
1073     MatroskaChapter *chapters;
1074     MatroskaTrack *tracks;
1075     EbmlList *index_list;
1076     MatroskaIndex *index;
1077     int index_scale = 1;
1078     Ebml ebml = { 0 };
1079     AVStream *st;
1080     int i, j;
1081
1082     matroska->ctx = s;
1083
1084     /* First read the EBML header. */
1085     if (ebml_parse(matroska, ebml_syntax, &ebml)
1086         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1087         || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1088         || ebml.doctype_version > 2) {
1089         av_log(matroska->ctx, AV_LOG_ERROR,
1090                "EBML header using unsupported features\n"
1091                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1092                ebml.version, ebml.doctype, ebml.doctype_version);
1093         return AVERROR_NOFMT;
1094     }
1095     ebml_free(ebml_syntax, &ebml);
1096
1097     /* The next thing is a segment. */
1098     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1099         return -1;
1100     matroska_execute_seekhead(matroska);
1101
1102     if (matroska->duration)
1103         matroska->ctx->duration = matroska->duration * matroska->time_scale
1104                                   * 1000 / AV_TIME_BASE;
1105     if (matroska->title)
1106         strncpy(matroska->ctx->title, matroska->title,
1107                 sizeof(matroska->ctx->title)-1);
1108     matroska_convert_tags(s, &matroska->tags);
1109
1110     tracks = matroska->tracks.elem;
1111     for (i=0; i < matroska->tracks.nb_elem; i++) {
1112         MatroskaTrack *track = &tracks[i];
1113         enum CodecID codec_id = CODEC_ID_NONE;
1114         EbmlList *encodings_list = &tracks->encodings;
1115         MatroskaTrackEncoding *encodings = encodings_list->elem;
1116         uint8_t *extradata = NULL;
1117         int extradata_size = 0;
1118         int extradata_offset = 0;
1119
1120         /* Apply some sanity checks. */
1121         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1122             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1123             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1124             av_log(matroska->ctx, AV_LOG_INFO,
1125                    "Unknown or unsupported track type %"PRIu64"\n",
1126                    track->type);
1127             continue;
1128         }
1129         if (track->codec_id == NULL)
1130             continue;
1131
1132         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1133             if (!track->default_duration)
1134                 track->default_duration = 1000000000/track->video.frame_rate;
1135             if (!track->video.display_width)
1136                 track->video.display_width = track->video.pixel_width;
1137             if (!track->video.display_height)
1138                 track->video.display_height = track->video.pixel_height;
1139         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1140             if (!track->audio.out_samplerate)
1141                 track->audio.out_samplerate = track->audio.samplerate;
1142         }
1143         if (encodings_list->nb_elem > 1) {
1144             av_log(matroska->ctx, AV_LOG_ERROR,
1145                    "Multiple combined encodings no supported");
1146         } else if (encodings_list->nb_elem == 1) {
1147             if (encodings[0].type ||
1148                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1149 #ifdef CONFIG_ZLIB
1150                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1151 #endif
1152 #ifdef CONFIG_BZLIB
1153                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1154 #endif
1155                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1156                 encodings[0].scope = 0;
1157                 av_log(matroska->ctx, AV_LOG_ERROR,
1158                        "Unsupported encoding type");
1159             } else if (track->codec_priv.size && encodings[0].scope&2) {
1160                 uint8_t *codec_priv = track->codec_priv.data;
1161                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1162                                                     &track->codec_priv.size,
1163                                                     track);
1164                 if (offset < 0) {
1165                     track->codec_priv.data = NULL;
1166                     track->codec_priv.size = 0;
1167                     av_log(matroska->ctx, AV_LOG_ERROR,
1168                            "Failed to decode codec private data\n");
1169                 } else if (offset > 0) {
1170                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1171                     memcpy(track->codec_priv.data,
1172                            encodings[0].compression.settings.data, offset);
1173                     memcpy(track->codec_priv.data+offset, codec_priv,
1174                            track->codec_priv.size);
1175                     track->codec_priv.size += offset;
1176                 }
1177                 if (codec_priv != track->codec_priv.data)
1178                     av_free(codec_priv);
1179             }
1180         }
1181
1182         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1183             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1184                         strlen(ff_mkv_codec_tags[j].str))){
1185                 codec_id= ff_mkv_codec_tags[j].id;
1186                 break;
1187             }
1188         }
1189
1190         st = track->stream = av_new_stream(s, 0);
1191         if (st == NULL)
1192             return AVERROR(ENOMEM);
1193
1194         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1195             && track->codec_priv.size >= 40
1196             && track->codec_priv.data != NULL) {
1197             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1198             codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1199         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1200                    && track->codec_priv.size >= 18
1201                    && track->codec_priv.data != NULL) {
1202             uint16_t tag = AV_RL16(track->codec_priv.data);
1203             codec_id = codec_get_id(codec_wav_tags, tag);
1204         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1205                    && (track->codec_priv.size >= 86)
1206                    && (track->codec_priv.data != NULL)) {
1207             track->video.fourcc = AV_RL32(track->codec_priv.data);
1208             codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1209         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1210             switch (track->audio.bitdepth) {
1211             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1212             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1213             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1214             }
1215         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1216             switch (track->audio.bitdepth) {
1217             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1218             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1219             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1220             }
1221         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1222             codec_id = CODEC_ID_PCM_F64LE;
1223         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1224             int profile = matroska_aac_profile(track->codec_id);
1225             int sri = matroska_aac_sri(track->audio.samplerate);
1226             extradata = av_malloc(5);
1227             if (extradata == NULL)
1228                 return AVERROR(ENOMEM);
1229             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1230             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1231             if (strstr(track->codec_id, "SBR")) {
1232                 sri = matroska_aac_sri(track->audio.out_samplerate);
1233                 extradata[2] = 0x56;
1234                 extradata[3] = 0xE5;
1235                 extradata[4] = 0x80 | (sri<<3);
1236                 extradata_size = 5;
1237             } else
1238                 extradata_size = 2;
1239         } else if (codec_id == CODEC_ID_TTA) {
1240             ByteIOContext b;
1241             extradata_size = 30;
1242             extradata = av_mallocz(extradata_size);
1243             if (extradata == NULL)
1244                 return AVERROR(ENOMEM);
1245             init_put_byte(&b, extradata, extradata_size, 1,
1246                           NULL, NULL, NULL, NULL);
1247             put_buffer(&b, "TTA1", 4);
1248             put_le16(&b, 1);
1249             put_le16(&b, track->audio.channels);
1250             put_le16(&b, track->audio.bitdepth);
1251             put_le32(&b, track->audio.out_samplerate);
1252             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1253         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1254                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1255             extradata_offset = 26;
1256             track->codec_priv.size -= extradata_offset;
1257         } else if (codec_id == CODEC_ID_RA_144) {
1258             track->audio.out_samplerate = 8000;
1259             track->audio.channels = 1;
1260         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1261                    codec_id == CODEC_ID_ATRAC3) {
1262             ByteIOContext b;
1263
1264             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1265                           0, NULL, NULL, NULL, NULL);
1266             url_fskip(&b, 24);
1267             track->audio.coded_framesize = get_be32(&b);
1268             url_fskip(&b, 12);
1269             track->audio.sub_packet_h    = get_be16(&b);
1270             track->audio.frame_size      = get_be16(&b);
1271             track->audio.sub_packet_size = get_be16(&b);
1272             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1273             if (codec_id == CODEC_ID_RA_288) {
1274                 st->codec->block_align = track->audio.coded_framesize;
1275                 track->codec_priv.size = 0;
1276             } else {
1277                 st->codec->block_align = track->audio.sub_packet_size;
1278                 extradata_offset = 78;
1279                 track->codec_priv.size -= extradata_offset;
1280             }
1281         }
1282
1283         if (codec_id == CODEC_ID_NONE)
1284             av_log(matroska->ctx, AV_LOG_INFO,
1285                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1286
1287         if (track->time_scale < 0.01)
1288             track->time_scale = 1.0;
1289         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1290
1291         st->codec->codec_id = codec_id;
1292         st->start_time = 0;
1293         if (strcmp(track->language, "und"))
1294             av_strlcpy(st->language, track->language, 4);
1295
1296         if (track->flag_default)
1297             st->disposition |= AV_DISPOSITION_DEFAULT;
1298
1299         if (track->default_duration)
1300             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1301                       track->default_duration, 1000000000, 30000);
1302
1303         if(extradata){
1304             st->codec->extradata = extradata;
1305             st->codec->extradata_size = extradata_size;
1306         } else if(track->codec_priv.data && track->codec_priv.size > 0){
1307             st->codec->extradata = av_malloc(track->codec_priv.size);
1308             if(st->codec->extradata == NULL)
1309                 return AVERROR(ENOMEM);
1310             st->codec->extradata_size = track->codec_priv.size;
1311             memcpy(st->codec->extradata,
1312                    track->codec_priv.data + extradata_offset,
1313                    track->codec_priv.size);
1314         }
1315
1316         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1317             st->codec->codec_type = CODEC_TYPE_VIDEO;
1318             st->codec->codec_tag  = track->video.fourcc;
1319             st->codec->width  = track->video.pixel_width;
1320             st->codec->height = track->video.pixel_height;
1321             av_reduce(&st->sample_aspect_ratio.num,
1322                       &st->sample_aspect_ratio.den,
1323                       st->codec->height * track->video.display_width,
1324                       st->codec-> width * track->video.display_height,
1325                       255);
1326             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1327         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1328             st->codec->codec_type = CODEC_TYPE_AUDIO;
1329             st->codec->sample_rate = track->audio.out_samplerate;
1330             st->codec->channels = track->audio.channels;
1331         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1332             st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1333         }
1334     }
1335
1336     attachements = attachements_list->elem;
1337     for (j=0; j<attachements_list->nb_elem; j++) {
1338         if (!(attachements[j].filename && attachements[j].mime &&
1339               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1340             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1341         } else {
1342             AVStream *st = av_new_stream(s, 0);
1343             if (st == NULL)
1344                 break;
1345             st->filename          = av_strdup(attachements[j].filename);
1346             st->codec->codec_id = CODEC_ID_NONE;
1347             st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1348             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1349             if(st->codec->extradata == NULL)
1350                 break;
1351             st->codec->extradata_size = attachements[j].bin.size;
1352             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1353
1354             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1355                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1356                              strlen(ff_mkv_mime_tags[i].str))) {
1357                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1358                     break;
1359                 }
1360             }
1361         }
1362     }
1363
1364     chapters = chapters_list->elem;
1365     for (i=0; i<chapters_list->nb_elem; i++)
1366         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1367             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1368                            chapters[i].start, chapters[i].end,
1369                            chapters[i].title);
1370
1371     index_list = &matroska->index;
1372     index = index_list->elem;
1373     if (index_list->nb_elem
1374         && index[0].time > 100000000000000/matroska->time_scale) {
1375         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1376         index_scale = matroska->time_scale;
1377     }
1378     for (i=0; i<index_list->nb_elem; i++) {
1379         EbmlList *pos_list = &index[i].pos;
1380         MatroskaIndexPos *pos = pos_list->elem;
1381         for (j=0; j<pos_list->nb_elem; j++) {
1382             MatroskaTrack *track = matroska_find_track_by_num(matroska,
1383                                                               pos[j].track);
1384             if (track && track->stream)
1385                 av_add_index_entry(track->stream,
1386                                    pos[j].pos + matroska->segment_start,
1387                                    index[i].time/index_scale, 0, 0,
1388                                    AVINDEX_KEYFRAME);
1389         }
1390     }
1391
1392     return 0;
1393 }
1394
1395 /*
1396  * Put one packet in an application-supplied AVPacket struct.
1397  * Returns 0 on success or -1 on failure.
1398  */
1399 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1400                                    AVPacket *pkt)
1401 {
1402     if (matroska->num_packets > 0) {
1403         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1404         av_free(matroska->packets[0]);
1405         if (matroska->num_packets > 1) {
1406             memmove(&matroska->packets[0], &matroska->packets[1],
1407                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1408             matroska->packets =
1409                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1410                            sizeof(AVPacket *));
1411         } else {
1412             av_freep(&matroska->packets);
1413         }
1414         matroska->num_packets--;
1415         return 0;
1416     }
1417
1418     return -1;
1419 }
1420
1421 /*
1422  * Free all packets in our internal queue.
1423  */
1424 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1425 {
1426     if (matroska->packets) {
1427         int n;
1428         for (n = 0; n < matroska->num_packets; n++) {
1429             av_free_packet(matroska->packets[n]);
1430             av_free(matroska->packets[n]);
1431         }
1432         av_freep(&matroska->packets);
1433         matroska->num_packets = 0;
1434     }
1435 }
1436
1437 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1438                                 int size, int64_t pos, uint64_t cluster_time,
1439                                 uint64_t duration, int is_keyframe,
1440                                 int64_t cluster_pos)
1441 {
1442     uint64_t timecode = AV_NOPTS_VALUE;
1443     MatroskaTrack *track;
1444     int res = 0;
1445     AVStream *st;
1446     AVPacket *pkt;
1447     int16_t block_time;
1448     uint32_t *lace_size = NULL;
1449     int n, flags, laces = 0;
1450     uint64_t num;
1451
1452     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1453         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1454         return res;
1455     }
1456     data += n;
1457     size -= n;
1458
1459     track = matroska_find_track_by_num(matroska, num);
1460     if (size <= 3 || !track || !track->stream) {
1461         av_log(matroska->ctx, AV_LOG_INFO,
1462                "Invalid stream %"PRIu64" or size %u\n", num, size);
1463         return res;
1464     }
1465     st = track->stream;
1466     if (st->discard >= AVDISCARD_ALL)
1467         return res;
1468     if (duration == AV_NOPTS_VALUE)
1469         duration = track->default_duration / matroska->time_scale;
1470
1471     block_time = AV_RB16(data);
1472     data += 2;
1473     flags = *data++;
1474     size -= 3;
1475     if (is_keyframe == -1)
1476         is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1477
1478     if (cluster_time != (uint64_t)-1
1479         && (block_time >= 0 || cluster_time >= -block_time)) {
1480         timecode = cluster_time + block_time;
1481         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1482             && timecode < track->end_timecode)
1483             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1484         if (is_keyframe)
1485             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1486         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1487     }
1488
1489     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1490         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1491             return res;
1492         matroska->skip_to_keyframe = 0;
1493     }
1494
1495     switch ((flags & 0x06) >> 1) {
1496         case 0x0: /* no lacing */
1497             laces = 1;
1498             lace_size = av_mallocz(sizeof(int));
1499             lace_size[0] = size;
1500             break;
1501
1502         case 0x1: /* Xiph lacing */
1503         case 0x2: /* fixed-size lacing */
1504         case 0x3: /* EBML lacing */
1505             assert(size>0); // size <=3 is checked before size-=3 above
1506             laces = (*data) + 1;
1507             data += 1;
1508             size -= 1;
1509             lace_size = av_mallocz(laces * sizeof(int));
1510
1511             switch ((flags & 0x06) >> 1) {
1512                 case 0x1: /* Xiph lacing */ {
1513                     uint8_t temp;
1514                     uint32_t total = 0;
1515                     for (n = 0; res == 0 && n < laces - 1; n++) {
1516                         while (1) {
1517                             if (size == 0) {
1518                                 res = -1;
1519                                 break;
1520                             }
1521                             temp = *data;
1522                             lace_size[n] += temp;
1523                             data += 1;
1524                             size -= 1;
1525                             if (temp != 0xff)
1526                                 break;
1527                         }
1528                         total += lace_size[n];
1529                     }
1530                     lace_size[n] = size - total;
1531                     break;
1532                 }
1533
1534                 case 0x2: /* fixed-size lacing */
1535                     for (n = 0; n < laces; n++)
1536                         lace_size[n] = size / laces;
1537                     break;
1538
1539                 case 0x3: /* EBML lacing */ {
1540                     uint32_t total;
1541                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1542                     if (n < 0) {
1543                         av_log(matroska->ctx, AV_LOG_INFO,
1544                                "EBML block data error\n");
1545                         break;
1546                     }
1547                     data += n;
1548                     size -= n;
1549                     total = lace_size[0] = num;
1550                     for (n = 1; res == 0 && n < laces - 1; n++) {
1551                         int64_t snum;
1552                         int r;
1553                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1554                         if (r < 0) {
1555                             av_log(matroska->ctx, AV_LOG_INFO,
1556                                    "EBML block data error\n");
1557                             break;
1558                         }
1559                         data += r;
1560                         size -= r;
1561                         lace_size[n] = lace_size[n - 1] + snum;
1562                         total += lace_size[n];
1563                     }
1564                     lace_size[n] = size - total;
1565                     break;
1566                 }
1567             }
1568             break;
1569     }
1570
1571     if (res == 0) {
1572         for (n = 0; n < laces; n++) {
1573             if (st->codec->codec_id == CODEC_ID_RA_288 ||
1574                 st->codec->codec_id == CODEC_ID_COOK ||
1575                 st->codec->codec_id == CODEC_ID_ATRAC3) {
1576                 int a = st->codec->block_align;
1577                 int sps = track->audio.sub_packet_size;
1578                 int cfs = track->audio.coded_framesize;
1579                 int h = track->audio.sub_packet_h;
1580                 int y = track->audio.sub_packet_cnt;
1581                 int w = track->audio.frame_size;
1582                 int x;
1583
1584                 if (!track->audio.pkt_cnt) {
1585                     if (st->codec->codec_id == CODEC_ID_RA_288)
1586                         for (x=0; x<h/2; x++)
1587                             memcpy(track->audio.buf+x*2*w+y*cfs,
1588                                    data+x*cfs, cfs);
1589                     else
1590                         for (x=0; x<w/sps; x++)
1591                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1592
1593                     if (++track->audio.sub_packet_cnt >= h) {
1594                         track->audio.sub_packet_cnt = 0;
1595                         track->audio.pkt_cnt = h*w / a;
1596                     }
1597                 }
1598                 while (track->audio.pkt_cnt) {
1599                     pkt = av_mallocz(sizeof(AVPacket));
1600                     av_new_packet(pkt, a);
1601                     memcpy(pkt->data, track->audio.buf
1602                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1603                     pkt->pos = pos;
1604                     pkt->stream_index = st->index;
1605                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1606                 }
1607             } else {
1608                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1609                 int offset = 0, pkt_size = lace_size[n];
1610                 uint8_t *pkt_data = data;
1611
1612                 if (encodings && encodings->scope & 1) {
1613                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1614                     if (offset < 0)
1615                         continue;
1616                 }
1617
1618                 pkt = av_mallocz(sizeof(AVPacket));
1619                 /* XXX: prevent data copy... */
1620                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1621                     av_free(pkt);
1622                     res = AVERROR(ENOMEM);
1623                     n = laces-1;
1624                     break;
1625                 }
1626                 if (offset)
1627                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1628                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1629
1630                 if (pkt_data != data)
1631                     av_free(pkt_data);
1632
1633                 if (n == 0)
1634                     pkt->flags = is_keyframe;
1635                 pkt->stream_index = st->index;
1636
1637                 pkt->pts = timecode;
1638                 pkt->pos = pos;
1639                 if (st->codec->codec_id == CODEC_ID_TEXT)
1640                     pkt->convergence_duration = duration;
1641                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1642                     pkt->duration = duration;
1643
1644                 if (st->codec->codec_id == CODEC_ID_SSA)
1645                     matroska_fix_ass_packet(matroska, pkt, duration);
1646
1647                 if (matroska->prev_pkt &&
1648                     timecode != AV_NOPTS_VALUE &&
1649                     matroska->prev_pkt->pts == timecode &&
1650                     matroska->prev_pkt->stream_index == st->index)
1651                     matroska_merge_packets(matroska->prev_pkt, pkt);
1652                 else {
1653                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1654                     matroska->prev_pkt = pkt;
1655                 }
1656             }
1657
1658             if (timecode != AV_NOPTS_VALUE)
1659                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1660             data += lace_size[n];
1661         }
1662     }
1663
1664     av_free(lace_size);
1665     return res;
1666 }
1667
1668 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1669 {
1670     MatroskaCluster cluster = { 0 };
1671     EbmlList *blocks_list;
1672     MatroskaBlock *blocks;
1673     int i, res;
1674     int64_t pos = url_ftell(matroska->ctx->pb);
1675     matroska->prev_pkt = NULL;
1676     if (matroska->has_cluster_id){
1677         /* For the first cluster we parse, its ID was already read as
1678            part of matroska_read_header(), so don't read it again */
1679         res = ebml_parse_id(matroska, matroska_clusters,
1680                             MATROSKA_ID_CLUSTER, &cluster);
1681         pos -= 4;  /* sizeof the ID which was already read */
1682         matroska->has_cluster_id = 0;
1683     } else
1684         res = ebml_parse(matroska, matroska_clusters, &cluster);
1685     blocks_list = &cluster.blocks;
1686     blocks = blocks_list->elem;
1687     for (i=0; i<blocks_list->nb_elem; i++)
1688         if (blocks[i].bin.size > 0)
1689             res=matroska_parse_block(matroska,
1690                                      blocks[i].bin.data, blocks[i].bin.size,
1691                                      blocks[i].bin.pos,  cluster.timecode,
1692                                      blocks[i].duration, !blocks[i].reference,
1693                                      pos);
1694     ebml_free(matroska_cluster, &cluster);
1695     if (res < 0)  matroska->done = 1;
1696     return res;
1697 }
1698
1699 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1700 {
1701     MatroskaDemuxContext *matroska = s->priv_data;
1702
1703     while (matroska_deliver_packet(matroska, pkt)) {
1704         if (matroska->done)
1705             return AVERROR(EIO);
1706         matroska_parse_cluster(matroska);
1707     }
1708
1709     return 0;
1710 }
1711
1712 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1713                               int64_t timestamp, int flags)
1714 {
1715     MatroskaDemuxContext *matroska = s->priv_data;
1716     MatroskaTrack *tracks = matroska->tracks.elem;
1717     AVStream *st = s->streams[stream_index];
1718     int i, index, index_sub, index_min;
1719
1720     if (!st->nb_index_entries)
1721         return 0;
1722     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1723
1724     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1725         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1726         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1727             matroska_clear_queue(matroska);
1728             if (matroska_parse_cluster(matroska) < 0)
1729                 break;
1730         }
1731     }
1732
1733     matroska_clear_queue(matroska);
1734     if (index < 0)
1735         return 0;
1736
1737     index_min = index;
1738     for (i=0; i < matroska->tracks.nb_elem; i++) {
1739         tracks[i].end_timecode = 0;
1740         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1741             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1742             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1743             if (index_sub >= 0
1744                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1745                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1746                 index_min = index_sub;
1747         }
1748     }
1749
1750     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1751     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1752     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1753     matroska->done = 0;
1754     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1755     return 0;
1756 }
1757
1758 static int matroska_read_close(AVFormatContext *s)
1759 {
1760     MatroskaDemuxContext *matroska = s->priv_data;
1761     MatroskaTrack *tracks = matroska->tracks.elem;
1762     int n;
1763
1764     matroska_clear_queue(matroska);
1765
1766     for (n=0; n < matroska->tracks.nb_elem; n++)
1767         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1768             av_free(tracks[n].audio.buf);
1769     ebml_free(matroska_segment, matroska);
1770
1771     return 0;
1772 }
1773
1774 AVInputFormat matroska_demuxer = {
1775     "matroska",
1776     NULL_IF_CONFIG_SMALL("Matroska file format"),
1777     sizeof(MatroskaDemuxContext),
1778     matroska_probe,
1779     matroska_read_header,
1780     matroska_read_packet,
1781     matroska_read_close,
1782     matroska_read_seek,
1783 };