matroskadec: Free ebml binary buffer on error
[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
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_freep(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         av_freep(&bin->data);
646         return AVERROR(EIO);
647     }
648
649     return 0;
650 }
651
652 /*
653  * Read the next element, but only the header. The contents
654  * are supposed to be sub-elements which can be read separately.
655  * 0 is success, < 0 is failure.
656  */
657 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
658 {
659     ByteIOContext *pb = matroska->ctx->pb;
660     MatroskaLevel *level;
661
662     if (matroska->num_levels >= EBML_MAX_DEPTH) {
663         av_log(matroska->ctx, AV_LOG_ERROR,
664                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
665         return AVERROR(ENOSYS);
666     }
667
668     level = &matroska->levels[matroska->num_levels++];
669     level->start = url_ftell(pb);
670     level->length = length;
671
672     return 0;
673 }
674
675 /*
676  * Read signed/unsigned "EBML" numbers.
677  * Return: number of bytes processed, < 0 on error
678  */
679 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
680                                  uint8_t *data, uint32_t size, uint64_t *num)
681 {
682     ByteIOContext pb;
683     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
684     return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
685 }
686
687 /*
688  * Same as above, but signed.
689  */
690 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
691                                  uint8_t *data, uint32_t size, int64_t *num)
692 {
693     uint64_t unum;
694     int res;
695
696     /* read as unsigned number first */
697     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
698         return res;
699
700     /* make signed (weird way) */
701     *num = unum - ((1LL << (7*res - 1)) - 1);
702
703     return res;
704 }
705
706 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
707                            EbmlSyntax *syntax, void *data);
708
709 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
710                          uint32_t id, void *data)
711 {
712     int i;
713     for (i=0; syntax[i].id; i++)
714         if (id == syntax[i].id)
715             break;
716     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
717         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
718     return ebml_parse_elem(matroska, &syntax[i], data);
719 }
720
721 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
722                       void *data)
723 {
724     uint64_t id;
725     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
726     id |= 1 << 7*res;
727     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
728 }
729
730 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
731                            void *data)
732 {
733     int i, res = 0;
734
735     for (i=0; syntax[i].id; i++)
736         switch (syntax[i].type) {
737         case EBML_UINT:
738             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
739             break;
740         case EBML_FLOAT:
741             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
742             break;
743         case EBML_STR:
744         case EBML_UTF8:
745             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
746             break;
747         }
748
749     while (!res && !ebml_level_end(matroska))
750         res = ebml_parse(matroska, syntax, data);
751
752     return res;
753 }
754
755 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
756                            EbmlSyntax *syntax, void *data)
757 {
758     ByteIOContext *pb = matroska->ctx->pb;
759     uint32_t id = syntax->id;
760     uint64_t length;
761     int res;
762
763     data = (char *)data + syntax->data_offset;
764     if (syntax->list_elem_size) {
765         EbmlList *list = data;
766         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
767         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
768         memset(data, 0, syntax->list_elem_size);
769         list->nb_elem++;
770     }
771
772     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
773         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
774             return res;
775
776     switch (syntax->type) {
777     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
778     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
779     case EBML_STR:
780     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
781     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
782     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
783                          return res;
784                      if (id == MATROSKA_ID_SEGMENT)
785                          matroska->segment_start = url_ftell(matroska->ctx->pb);
786                      return ebml_parse_nest(matroska, syntax->def.n, data);
787     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
788     case EBML_STOP:  *(int *)data = 1;      return 1;
789     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
790     }
791     if (res == AVERROR_INVALIDDATA)
792         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
793     else if (res == AVERROR(EIO))
794         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
795     return res;
796 }
797
798 static void ebml_free(EbmlSyntax *syntax, void *data)
799 {
800     int i, j;
801     for (i=0; syntax[i].id; i++) {
802         void *data_off = (char *)data + syntax[i].data_offset;
803         switch (syntax[i].type) {
804         case EBML_STR:
805         case EBML_UTF8:  av_freep(data_off);                      break;
806         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
807         case EBML_NEST:
808             if (syntax[i].list_elem_size) {
809                 EbmlList *list = data_off;
810                 char *ptr = list->elem;
811                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
812                     ebml_free(syntax[i].def.n, ptr);
813                 av_free(list->elem);
814             } else
815                 ebml_free(syntax[i].def.n, data_off);
816         default:  break;
817         }
818     }
819 }
820
821
822 /*
823  * Autodetecting...
824  */
825 static int matroska_probe(AVProbeData *p)
826 {
827     uint64_t total = 0;
828     int len_mask = 0x80, size = 1, n = 1;
829     static const char probe_data[] = "matroska";
830
831     /* EBML header? */
832     if (AV_RB32(p->buf) != EBML_ID_HEADER)
833         return 0;
834
835     /* length of header */
836     total = p->buf[4];
837     while (size <= 8 && !(total & len_mask)) {
838         size++;
839         len_mask >>= 1;
840     }
841     if (size > 8)
842       return 0;
843     total &= (len_mask - 1);
844     while (n < size)
845         total = (total << 8) | p->buf[4 + n++];
846
847     /* Does the probe data contain the whole header? */
848     if (p->buf_size < 4 + size + total)
849       return 0;
850
851     /* The header must contain the document type 'matroska'. For now,
852      * we don't parse the whole header but simply check for the
853      * availability of that array of characters inside the header.
854      * Not fully fool-proof, but good enough. */
855     for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
856         if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
857             return AVPROBE_SCORE_MAX;
858
859     return 0;
860 }
861
862 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
863                                                  int num)
864 {
865     MatroskaTrack *tracks = matroska->tracks.elem;
866     int i;
867
868     for (i=0; i < matroska->tracks.nb_elem; i++)
869         if (tracks[i].num == num)
870             return &tracks[i];
871
872     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
873     return NULL;
874 }
875
876 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
877                                   MatroskaTrack *track)
878 {
879     MatroskaTrackEncoding *encodings = track->encodings.elem;
880     uint8_t* data = *buf;
881     int isize = *buf_size;
882     uint8_t* pkt_data = NULL;
883     int pkt_size = isize;
884     int result = 0;
885     int olen;
886
887     switch (encodings[0].compression.algo) {
888     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
889         return encodings[0].compression.settings.size;
890     case MATROSKA_TRACK_ENCODING_COMP_LZO:
891         do {
892             olen = pkt_size *= 3;
893             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
894             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
895         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
896         if (result)
897             goto failed;
898         pkt_size -= olen;
899         break;
900 #if CONFIG_ZLIB
901     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
902         z_stream zstream = {0};
903         if (inflateInit(&zstream) != Z_OK)
904             return -1;
905         zstream.next_in = data;
906         zstream.avail_in = isize;
907         do {
908             pkt_size *= 3;
909             pkt_data = av_realloc(pkt_data, pkt_size);
910             zstream.avail_out = pkt_size - zstream.total_out;
911             zstream.next_out = pkt_data + zstream.total_out;
912             result = inflate(&zstream, Z_NO_FLUSH);
913         } while (result==Z_OK && pkt_size<10000000);
914         pkt_size = zstream.total_out;
915         inflateEnd(&zstream);
916         if (result != Z_STREAM_END)
917             goto failed;
918         break;
919     }
920 #endif
921 #if CONFIG_BZLIB
922     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
923         bz_stream bzstream = {0};
924         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
925             return -1;
926         bzstream.next_in = data;
927         bzstream.avail_in = isize;
928         do {
929             pkt_size *= 3;
930             pkt_data = av_realloc(pkt_data, pkt_size);
931             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
932             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
933             result = BZ2_bzDecompress(&bzstream);
934         } while (result==BZ_OK && pkt_size<10000000);
935         pkt_size = bzstream.total_out_lo32;
936         BZ2_bzDecompressEnd(&bzstream);
937         if (result != BZ_STREAM_END)
938             goto failed;
939         break;
940     }
941 #endif
942     default:
943         return -1;
944     }
945
946     *buf = pkt_data;
947     *buf_size = pkt_size;
948     return 0;
949  failed:
950     av_free(pkt_data);
951     return -1;
952 }
953
954 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
955                                     AVPacket *pkt, uint64_t display_duration)
956 {
957     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
958     for (; *ptr!=',' && ptr<end-1; ptr++);
959     if (*ptr == ',')
960         layer = ++ptr;
961     for (; *ptr!=',' && ptr<end-1; ptr++);
962     if (*ptr == ',') {
963         int64_t end_pts = pkt->pts + display_duration;
964         int sc = matroska->time_scale * pkt->pts / 10000000;
965         int ec = matroska->time_scale * end_pts  / 10000000;
966         int sh, sm, ss, eh, em, es, len;
967         sh = sc/360000;  sc -= 360000*sh;
968         sm = sc/  6000;  sc -=   6000*sm;
969         ss = sc/   100;  sc -=    100*ss;
970         eh = ec/360000;  ec -= 360000*eh;
971         em = ec/  6000;  ec -=   6000*em;
972         es = ec/   100;  ec -=    100*es;
973         *ptr++ = '\0';
974         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
975         if (!(line = av_malloc(len)))
976             return;
977         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
978                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
979         av_free(pkt->data);
980         pkt->data = line;
981         pkt->size = strlen(line);
982     }
983 }
984
985 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
986 {
987     out->data = av_realloc(out->data, out->size+in->size);
988     memcpy(out->data+out->size, in->data, in->size);
989     out->size += in->size;
990     av_destruct_packet(in);
991     av_free(in);
992 }
993
994 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
995                                  AVMetadata **metadata, char *prefix)
996 {
997     MatroskaTag *tags = list->elem;
998     char key[1024];
999     int i;
1000
1001     for (i=0; i < list->nb_elem; i++) {
1002         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1003         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1004         else         av_strlcpy(key, tags[i].name, sizeof(key));
1005         if (tags[i].def || !lang) {
1006         av_metadata_set2(metadata, key, tags[i].string, 0);
1007         if (tags[i].sub.nb_elem)
1008             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1009         }
1010         if (lang) {
1011             av_strlcat(key, "-", sizeof(key));
1012             av_strlcat(key, lang, sizeof(key));
1013             av_metadata_set2(metadata, key, tags[i].string, 0);
1014             if (tags[i].sub.nb_elem)
1015                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1016         }
1017     }
1018 }
1019
1020 static void matroska_convert_tags(AVFormatContext *s)
1021 {
1022     MatroskaDemuxContext *matroska = s->priv_data;
1023     MatroskaTags *tags = matroska->tags.elem;
1024     int i, j;
1025
1026     for (i=0; i < matroska->tags.nb_elem; i++) {
1027         if (tags[i].target.attachuid) {
1028             MatroskaAttachement *attachment = matroska->attachments.elem;
1029             for (j=0; j<matroska->attachments.nb_elem; j++)
1030                 if (attachment[j].uid == tags[i].target.attachuid)
1031                     matroska_convert_tag(s, &tags[i].tag,
1032                                          &attachment[j].stream->metadata, NULL);
1033         } else if (tags[i].target.chapteruid) {
1034             MatroskaChapter *chapter = matroska->chapters.elem;
1035             for (j=0; j<matroska->chapters.nb_elem; j++)
1036                 if (chapter[j].uid == tags[i].target.chapteruid)
1037                     matroska_convert_tag(s, &tags[i].tag,
1038                                          &chapter[j].chapter->metadata, NULL);
1039         } else if (tags[i].target.trackuid) {
1040             MatroskaTrack *track = matroska->tracks.elem;
1041             for (j=0; j<matroska->tracks.nb_elem; j++)
1042                 if (track[j].uid == tags[i].target.trackuid)
1043                     matroska_convert_tag(s, &tags[i].tag,
1044                                          &track[j].stream->metadata, NULL);
1045         } else {
1046             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1047                                  tags[i].target.type);
1048         }
1049     }
1050 }
1051
1052 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1053 {
1054     EbmlList *seekhead_list = &matroska->seekhead;
1055     MatroskaSeekhead *seekhead = seekhead_list->elem;
1056     uint32_t level_up = matroska->level_up;
1057     int64_t before_pos = url_ftell(matroska->ctx->pb);
1058     MatroskaLevel level;
1059     int i;
1060
1061     for (i=0; i<seekhead_list->nb_elem; i++) {
1062         int64_t offset = seekhead[i].pos + matroska->segment_start;
1063
1064         if (seekhead[i].pos <= before_pos
1065             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1066             || seekhead[i].id == MATROSKA_ID_CLUSTER)
1067             continue;
1068
1069         /* seek */
1070         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1071             continue;
1072
1073         /* We don't want to lose our seekhead level, so we add
1074          * a dummy. This is a crude hack. */
1075         if (matroska->num_levels == EBML_MAX_DEPTH) {
1076             av_log(matroska->ctx, AV_LOG_INFO,
1077                    "Max EBML element depth (%d) reached, "
1078                    "cannot parse further.\n", EBML_MAX_DEPTH);
1079             break;
1080         }
1081
1082         level.start = 0;
1083         level.length = (uint64_t)-1;
1084         matroska->levels[matroska->num_levels] = level;
1085         matroska->num_levels++;
1086
1087         ebml_parse(matroska, matroska_segment, matroska);
1088
1089         /* remove dummy level */
1090         while (matroska->num_levels) {
1091             uint64_t length = matroska->levels[--matroska->num_levels].length;
1092             if (length == (uint64_t)-1)
1093                 break;
1094         }
1095     }
1096
1097     /* seek back */
1098     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1099     matroska->level_up = level_up;
1100 }
1101
1102 static int matroska_aac_profile(char *codec_id)
1103 {
1104     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1105     int profile;
1106
1107     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1108         if (strstr(codec_id, aac_profiles[profile]))
1109             break;
1110     return profile + 1;
1111 }
1112
1113 static int matroska_aac_sri(int samplerate)
1114 {
1115     int sri;
1116
1117     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1118         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1119             break;
1120     return sri;
1121 }
1122
1123 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1124 {
1125     MatroskaDemuxContext *matroska = s->priv_data;
1126     EbmlList *attachements_list = &matroska->attachments;
1127     MatroskaAttachement *attachements;
1128     EbmlList *chapters_list = &matroska->chapters;
1129     MatroskaChapter *chapters;
1130     MatroskaTrack *tracks;
1131     EbmlList *index_list;
1132     MatroskaIndex *index;
1133     int index_scale = 1;
1134     uint64_t max_start = 0;
1135     Ebml ebml = { 0 };
1136     AVStream *st;
1137     int i, j;
1138
1139     matroska->ctx = s;
1140
1141     /* First read the EBML header. */
1142     if (ebml_parse(matroska, ebml_syntax, &ebml)
1143         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1144         || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1145         || ebml.doctype_version > 2) {
1146         av_log(matroska->ctx, AV_LOG_ERROR,
1147                "EBML header using unsupported features\n"
1148                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1149                ebml.version, ebml.doctype, ebml.doctype_version);
1150         return AVERROR_PATCHWELCOME;
1151     }
1152     ebml_free(ebml_syntax, &ebml);
1153
1154     /* The next thing is a segment. */
1155     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1156         return -1;
1157     matroska_execute_seekhead(matroska);
1158
1159     if (!matroska->time_scale)
1160         matroska->time_scale = 1000000;
1161     if (matroska->duration)
1162         matroska->ctx->duration = matroska->duration * matroska->time_scale
1163                                   * 1000 / AV_TIME_BASE;
1164     av_metadata_set2(&s->metadata, "title", matroska->title, 0);
1165
1166     tracks = matroska->tracks.elem;
1167     for (i=0; i < matroska->tracks.nb_elem; i++) {
1168         MatroskaTrack *track = &tracks[i];
1169         enum CodecID codec_id = CODEC_ID_NONE;
1170         EbmlList *encodings_list = &tracks->encodings;
1171         MatroskaTrackEncoding *encodings = encodings_list->elem;
1172         uint8_t *extradata = NULL;
1173         int extradata_size = 0;
1174         int extradata_offset = 0;
1175         ByteIOContext b;
1176
1177         /* Apply some sanity checks. */
1178         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1179             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1180             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1181             av_log(matroska->ctx, AV_LOG_INFO,
1182                    "Unknown or unsupported track type %"PRIu64"\n",
1183                    track->type);
1184             continue;
1185         }
1186         if (track->codec_id == NULL)
1187             continue;
1188
1189         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1190             if (!track->default_duration)
1191                 track->default_duration = 1000000000/track->video.frame_rate;
1192             if (!track->video.display_width)
1193                 track->video.display_width = track->video.pixel_width;
1194             if (!track->video.display_height)
1195                 track->video.display_height = track->video.pixel_height;
1196         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1197             if (!track->audio.out_samplerate)
1198                 track->audio.out_samplerate = track->audio.samplerate;
1199         }
1200         if (encodings_list->nb_elem > 1) {
1201             av_log(matroska->ctx, AV_LOG_ERROR,
1202                    "Multiple combined encodings no supported");
1203         } else if (encodings_list->nb_elem == 1) {
1204             if (encodings[0].type ||
1205                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1206 #if CONFIG_ZLIB
1207                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1208 #endif
1209 #if CONFIG_BZLIB
1210                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1211 #endif
1212                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1213                 encodings[0].scope = 0;
1214                 av_log(matroska->ctx, AV_LOG_ERROR,
1215                        "Unsupported encoding type");
1216             } else if (track->codec_priv.size && encodings[0].scope&2) {
1217                 uint8_t *codec_priv = track->codec_priv.data;
1218                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1219                                                     &track->codec_priv.size,
1220                                                     track);
1221                 if (offset < 0) {
1222                     track->codec_priv.data = NULL;
1223                     track->codec_priv.size = 0;
1224                     av_log(matroska->ctx, AV_LOG_ERROR,
1225                            "Failed to decode codec private data\n");
1226                 } else if (offset > 0) {
1227                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1228                     memcpy(track->codec_priv.data,
1229                            encodings[0].compression.settings.data, offset);
1230                     memcpy(track->codec_priv.data+offset, codec_priv,
1231                            track->codec_priv.size);
1232                     track->codec_priv.size += offset;
1233                 }
1234                 if (codec_priv != track->codec_priv.data)
1235                     av_free(codec_priv);
1236             }
1237         }
1238
1239         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1240             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1241                         strlen(ff_mkv_codec_tags[j].str))){
1242                 codec_id= ff_mkv_codec_tags[j].id;
1243                 break;
1244             }
1245         }
1246
1247         st = track->stream = av_new_stream(s, 0);
1248         if (st == NULL)
1249             return AVERROR(ENOMEM);
1250
1251         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1252             && track->codec_priv.size >= 40
1253             && track->codec_priv.data != NULL) {
1254             track->ms_compat = 1;
1255             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1256             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1257             extradata_offset = 40;
1258         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1259                    && track->codec_priv.size >= 14
1260                    && track->codec_priv.data != NULL) {
1261             init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1262                           URL_RDONLY, NULL, NULL, NULL, NULL);
1263             ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1264             codec_id = st->codec->codec_id;
1265             extradata_offset = FFMIN(track->codec_priv.size, 18);
1266         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1267                    && (track->codec_priv.size >= 86)
1268                    && (track->codec_priv.data != NULL)) {
1269             track->video.fourcc = AV_RL32(track->codec_priv.data);
1270             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1271         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1272             switch (track->audio.bitdepth) {
1273             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1274             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1275             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1276             }
1277         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1278             switch (track->audio.bitdepth) {
1279             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1280             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1281             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1282             }
1283         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1284             codec_id = CODEC_ID_PCM_F64LE;
1285         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1286             int profile = matroska_aac_profile(track->codec_id);
1287             int sri = matroska_aac_sri(track->audio.samplerate);
1288             extradata = av_malloc(5);
1289             if (extradata == NULL)
1290                 return AVERROR(ENOMEM);
1291             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1292             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1293             if (strstr(track->codec_id, "SBR")) {
1294                 sri = matroska_aac_sri(track->audio.out_samplerate);
1295                 extradata[2] = 0x56;
1296                 extradata[3] = 0xE5;
1297                 extradata[4] = 0x80 | (sri<<3);
1298                 extradata_size = 5;
1299             } else
1300                 extradata_size = 2;
1301         } else if (codec_id == CODEC_ID_TTA) {
1302             extradata_size = 30;
1303             extradata = av_mallocz(extradata_size);
1304             if (extradata == NULL)
1305                 return AVERROR(ENOMEM);
1306             init_put_byte(&b, extradata, extradata_size, 1,
1307                           NULL, NULL, NULL, NULL);
1308             put_buffer(&b, "TTA1", 4);
1309             put_le16(&b, 1);
1310             put_le16(&b, track->audio.channels);
1311             put_le16(&b, track->audio.bitdepth);
1312             put_le32(&b, track->audio.out_samplerate);
1313             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1314         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1315                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1316             extradata_offset = 26;
1317         } else if (codec_id == CODEC_ID_RA_144) {
1318             track->audio.out_samplerate = 8000;
1319             track->audio.channels = 1;
1320         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1321                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1322             int flavor;
1323             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1324                           0, NULL, NULL, NULL, NULL);
1325             url_fskip(&b, 22);
1326             flavor                       = get_be16(&b);
1327             track->audio.coded_framesize = get_be32(&b);
1328             url_fskip(&b, 12);
1329             track->audio.sub_packet_h    = get_be16(&b);
1330             track->audio.frame_size      = get_be16(&b);
1331             track->audio.sub_packet_size = get_be16(&b);
1332             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1333             if (codec_id == CODEC_ID_RA_288) {
1334                 st->codec->block_align = track->audio.coded_framesize;
1335                 track->codec_priv.size = 0;
1336             } else {
1337                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1338                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1339                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1340                     st->codec->bit_rate = sipr_bit_rate[flavor];
1341                 }
1342                 st->codec->block_align = track->audio.sub_packet_size;
1343                 extradata_offset = 78;
1344             }
1345         }
1346         track->codec_priv.size -= extradata_offset;
1347
1348         if (codec_id == CODEC_ID_NONE)
1349             av_log(matroska->ctx, AV_LOG_INFO,
1350                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1351
1352         if (track->time_scale < 0.01)
1353             track->time_scale = 1.0;
1354         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1355
1356         st->codec->codec_id = codec_id;
1357         st->start_time = 0;
1358         if (strcmp(track->language, "und"))
1359             av_metadata_set2(&st->metadata, "language", track->language, 0);
1360         av_metadata_set2(&st->metadata, "title", track->name, 0);
1361
1362         if (track->flag_default)
1363             st->disposition |= AV_DISPOSITION_DEFAULT;
1364
1365         if (track->default_duration)
1366             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1367                       track->default_duration, 1000000000, 30000);
1368
1369         if (!st->codec->extradata) {
1370             if(extradata){
1371                 st->codec->extradata = extradata;
1372                 st->codec->extradata_size = extradata_size;
1373             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1374                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1375                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1376                 if(st->codec->extradata == NULL)
1377                     return AVERROR(ENOMEM);
1378                 st->codec->extradata_size = track->codec_priv.size;
1379                 memcpy(st->codec->extradata,
1380                        track->codec_priv.data + extradata_offset,
1381                        track->codec_priv.size);
1382             }
1383         }
1384
1385         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1386             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1387             st->codec->codec_tag  = track->video.fourcc;
1388             st->codec->width  = track->video.pixel_width;
1389             st->codec->height = track->video.pixel_height;
1390             av_reduce(&st->sample_aspect_ratio.num,
1391                       &st->sample_aspect_ratio.den,
1392                       st->codec->height * track->video.display_width,
1393                       st->codec-> width * track->video.display_height,
1394                       255);
1395             if (st->codec->codec_id != CODEC_ID_H264)
1396             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1397             if (track->default_duration)
1398                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1399         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1400             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1401             st->codec->sample_rate = track->audio.out_samplerate;
1402             st->codec->channels = track->audio.channels;
1403             if (st->codec->codec_id != CODEC_ID_AAC)
1404             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1405         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1406             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1407         }
1408     }
1409
1410     attachements = attachements_list->elem;
1411     for (j=0; j<attachements_list->nb_elem; j++) {
1412         if (!(attachements[j].filename && attachements[j].mime &&
1413               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1414             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1415         } else {
1416             AVStream *st = av_new_stream(s, 0);
1417             if (st == NULL)
1418                 break;
1419             av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
1420             st->codec->codec_id = CODEC_ID_NONE;
1421             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1422             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1423             if(st->codec->extradata == NULL)
1424                 break;
1425             st->codec->extradata_size = attachements[j].bin.size;
1426             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1427
1428             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1429                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1430                              strlen(ff_mkv_mime_tags[i].str))) {
1431                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1432                     break;
1433                 }
1434             }
1435             attachements[j].stream = st;
1436         }
1437     }
1438
1439     chapters = chapters_list->elem;
1440     for (i=0; i<chapters_list->nb_elem; i++)
1441         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1442             && (max_start==0 || chapters[i].start > max_start)) {
1443             chapters[i].chapter =
1444             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1445                            chapters[i].start, chapters[i].end,
1446                            chapters[i].title);
1447             av_metadata_set2(&chapters[i].chapter->metadata,
1448                              "title", chapters[i].title, 0);
1449             max_start = chapters[i].start;
1450         }
1451
1452     index_list = &matroska->index;
1453     index = index_list->elem;
1454     if (index_list->nb_elem
1455         && index[0].time > 100000000000000/matroska->time_scale) {
1456         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1457         index_scale = matroska->time_scale;
1458     }
1459     for (i=0; i<index_list->nb_elem; i++) {
1460         EbmlList *pos_list = &index[i].pos;
1461         MatroskaIndexPos *pos = pos_list->elem;
1462         for (j=0; j<pos_list->nb_elem; j++) {
1463             MatroskaTrack *track = matroska_find_track_by_num(matroska,
1464                                                               pos[j].track);
1465             if (track && track->stream)
1466                 av_add_index_entry(track->stream,
1467                                    pos[j].pos + matroska->segment_start,
1468                                    index[i].time/index_scale, 0, 0,
1469                                    AVINDEX_KEYFRAME);
1470         }
1471     }
1472
1473     matroska_convert_tags(s);
1474
1475     return 0;
1476 }
1477
1478 /*
1479  * Put one packet in an application-supplied AVPacket struct.
1480  * Returns 0 on success or -1 on failure.
1481  */
1482 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1483                                    AVPacket *pkt)
1484 {
1485     if (matroska->num_packets > 0) {
1486         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1487         av_free(matroska->packets[0]);
1488         if (matroska->num_packets > 1) {
1489             memmove(&matroska->packets[0], &matroska->packets[1],
1490                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1491             matroska->packets =
1492                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1493                            sizeof(AVPacket *));
1494         } else {
1495             av_freep(&matroska->packets);
1496         }
1497         matroska->num_packets--;
1498         return 0;
1499     }
1500
1501     return -1;
1502 }
1503
1504 /*
1505  * Free all packets in our internal queue.
1506  */
1507 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1508 {
1509     if (matroska->packets) {
1510         int n;
1511         for (n = 0; n < matroska->num_packets; n++) {
1512             av_free_packet(matroska->packets[n]);
1513             av_free(matroska->packets[n]);
1514         }
1515         av_freep(&matroska->packets);
1516         matroska->num_packets = 0;
1517     }
1518 }
1519
1520 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1521                                 int size, int64_t pos, uint64_t cluster_time,
1522                                 uint64_t duration, int is_keyframe,
1523                                 int64_t cluster_pos)
1524 {
1525     uint64_t timecode = AV_NOPTS_VALUE;
1526     MatroskaTrack *track;
1527     int res = 0;
1528     AVStream *st;
1529     AVPacket *pkt;
1530     int16_t block_time;
1531     uint32_t *lace_size = NULL;
1532     int n, flags, laces = 0;
1533     uint64_t num;
1534
1535     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1536         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1537         return res;
1538     }
1539     data += n;
1540     size -= n;
1541
1542     track = matroska_find_track_by_num(matroska, num);
1543     if (size <= 3 || !track || !track->stream) {
1544         av_log(matroska->ctx, AV_LOG_INFO,
1545                "Invalid stream %"PRIu64" or size %u\n", num, size);
1546         return res;
1547     }
1548     st = track->stream;
1549     if (st->discard >= AVDISCARD_ALL)
1550         return res;
1551     if (duration == AV_NOPTS_VALUE)
1552         duration = track->default_duration / matroska->time_scale;
1553
1554     block_time = AV_RB16(data);
1555     data += 2;
1556     flags = *data++;
1557     size -= 3;
1558     if (is_keyframe == -1)
1559         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1560
1561     if (cluster_time != (uint64_t)-1
1562         && (block_time >= 0 || cluster_time >= -block_time)) {
1563         timecode = cluster_time + block_time;
1564         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1565             && timecode < track->end_timecode)
1566             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1567         if (is_keyframe)
1568             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1569         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1570     }
1571
1572     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1573         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1574             return res;
1575         matroska->skip_to_keyframe = 0;
1576     }
1577
1578     switch ((flags & 0x06) >> 1) {
1579         case 0x0: /* no lacing */
1580             laces = 1;
1581             lace_size = av_mallocz(sizeof(int));
1582             lace_size[0] = size;
1583             break;
1584
1585         case 0x1: /* Xiph lacing */
1586         case 0x2: /* fixed-size lacing */
1587         case 0x3: /* EBML lacing */
1588             assert(size>0); // size <=3 is checked before size-=3 above
1589             laces = (*data) + 1;
1590             data += 1;
1591             size -= 1;
1592             lace_size = av_mallocz(laces * sizeof(int));
1593
1594             switch ((flags & 0x06) >> 1) {
1595                 case 0x1: /* Xiph lacing */ {
1596                     uint8_t temp;
1597                     uint32_t total = 0;
1598                     for (n = 0; res == 0 && n < laces - 1; n++) {
1599                         while (1) {
1600                             if (size == 0) {
1601                                 res = -1;
1602                                 break;
1603                             }
1604                             temp = *data;
1605                             lace_size[n] += temp;
1606                             data += 1;
1607                             size -= 1;
1608                             if (temp != 0xff)
1609                                 break;
1610                         }
1611                         total += lace_size[n];
1612                     }
1613                     lace_size[n] = size - total;
1614                     break;
1615                 }
1616
1617                 case 0x2: /* fixed-size lacing */
1618                     for (n = 0; n < laces; n++)
1619                         lace_size[n] = size / laces;
1620                     break;
1621
1622                 case 0x3: /* EBML lacing */ {
1623                     uint32_t total;
1624                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1625                     if (n < 0) {
1626                         av_log(matroska->ctx, AV_LOG_INFO,
1627                                "EBML block data error\n");
1628                         break;
1629                     }
1630                     data += n;
1631                     size -= n;
1632                     total = lace_size[0] = num;
1633                     for (n = 1; res == 0 && n < laces - 1; n++) {
1634                         int64_t snum;
1635                         int r;
1636                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1637                         if (r < 0) {
1638                             av_log(matroska->ctx, AV_LOG_INFO,
1639                                    "EBML block data error\n");
1640                             break;
1641                         }
1642                         data += r;
1643                         size -= r;
1644                         lace_size[n] = lace_size[n - 1] + snum;
1645                         total += lace_size[n];
1646                     }
1647                     lace_size[n] = size - total;
1648                     break;
1649                 }
1650             }
1651             break;
1652     }
1653
1654     if (res == 0) {
1655         for (n = 0; n < laces; n++) {
1656             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1657                  st->codec->codec_id == CODEC_ID_COOK ||
1658                  st->codec->codec_id == CODEC_ID_SIPR ||
1659                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1660                  st->codec->block_align && track->audio.sub_packet_size) {
1661                 int a = st->codec->block_align;
1662                 int sps = track->audio.sub_packet_size;
1663                 int cfs = track->audio.coded_framesize;
1664                 int h = track->audio.sub_packet_h;
1665                 int y = track->audio.sub_packet_cnt;
1666                 int w = track->audio.frame_size;
1667                 int x;
1668
1669                 if (!track->audio.pkt_cnt) {
1670                     if (st->codec->codec_id == CODEC_ID_RA_288)
1671                         for (x=0; x<h/2; x++)
1672                             memcpy(track->audio.buf+x*2*w+y*cfs,
1673                                    data+x*cfs, cfs);
1674                     else if (st->codec->codec_id == CODEC_ID_SIPR)
1675                         memcpy(track->audio.buf + y*w, data, w);
1676                     else
1677                         for (x=0; x<w/sps; x++)
1678                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1679
1680                     if (++track->audio.sub_packet_cnt >= h) {
1681                         if (st->codec->codec_id == CODEC_ID_SIPR)
1682                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1683                         track->audio.sub_packet_cnt = 0;
1684                         track->audio.pkt_cnt = h*w / a;
1685                     }
1686                 }
1687                 while (track->audio.pkt_cnt) {
1688                     pkt = av_mallocz(sizeof(AVPacket));
1689                     av_new_packet(pkt, a);
1690                     memcpy(pkt->data, track->audio.buf
1691                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1692                     pkt->pos = pos;
1693                     pkt->stream_index = st->index;
1694                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1695                 }
1696             } else {
1697                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1698                 int offset = 0, pkt_size = lace_size[n];
1699                 uint8_t *pkt_data = data;
1700
1701                 if (lace_size[n] > size) {
1702                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1703                     break;
1704                 }
1705
1706                 if (encodings && encodings->scope & 1) {
1707                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1708                     if (offset < 0)
1709                         continue;
1710                 }
1711
1712                 pkt = av_mallocz(sizeof(AVPacket));
1713                 /* XXX: prevent data copy... */
1714                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1715                     av_free(pkt);
1716                     res = AVERROR(ENOMEM);
1717                     break;
1718                 }
1719                 if (offset)
1720                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1721                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1722
1723                 if (pkt_data != data)
1724                     av_free(pkt_data);
1725
1726                 if (n == 0)
1727                     pkt->flags = is_keyframe;
1728                 pkt->stream_index = st->index;
1729
1730                 if (track->ms_compat)
1731                     pkt->dts = timecode;
1732                 else
1733                     pkt->pts = timecode;
1734                 pkt->pos = pos;
1735                 if (st->codec->codec_id == CODEC_ID_TEXT)
1736                     pkt->convergence_duration = duration;
1737                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1738                     pkt->duration = duration;
1739
1740                 if (st->codec->codec_id == CODEC_ID_SSA)
1741                     matroska_fix_ass_packet(matroska, pkt, duration);
1742
1743                 if (matroska->prev_pkt &&
1744                     timecode != AV_NOPTS_VALUE &&
1745                     matroska->prev_pkt->pts == timecode &&
1746                     matroska->prev_pkt->stream_index == st->index)
1747                     matroska_merge_packets(matroska->prev_pkt, pkt);
1748                 else {
1749                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1750                     matroska->prev_pkt = pkt;
1751                 }
1752             }
1753
1754             if (timecode != AV_NOPTS_VALUE)
1755                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1756             data += lace_size[n];
1757             size -= lace_size[n];
1758         }
1759     }
1760
1761     av_free(lace_size);
1762     return res;
1763 }
1764
1765 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1766 {
1767     MatroskaCluster cluster = { 0 };
1768     EbmlList *blocks_list;
1769     MatroskaBlock *blocks;
1770     int i, res;
1771     int64_t pos = url_ftell(matroska->ctx->pb);
1772     matroska->prev_pkt = NULL;
1773     if (matroska->has_cluster_id){
1774         /* For the first cluster we parse, its ID was already read as
1775            part of matroska_read_header(), so don't read it again */
1776         res = ebml_parse_id(matroska, matroska_clusters,
1777                             MATROSKA_ID_CLUSTER, &cluster);
1778         pos -= 4;  /* sizeof the ID which was already read */
1779         matroska->has_cluster_id = 0;
1780     } else
1781         res = ebml_parse(matroska, matroska_clusters, &cluster);
1782     blocks_list = &cluster.blocks;
1783     blocks = blocks_list->elem;
1784     for (i=0; i<blocks_list->nb_elem; i++)
1785         if (blocks[i].bin.size > 0) {
1786             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1787             res=matroska_parse_block(matroska,
1788                                      blocks[i].bin.data, blocks[i].bin.size,
1789                                      blocks[i].bin.pos,  cluster.timecode,
1790                                      blocks[i].duration, is_keyframe,
1791                                      pos);
1792         }
1793     ebml_free(matroska_cluster, &cluster);
1794     if (res < 0)  matroska->done = 1;
1795     return res;
1796 }
1797
1798 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1799 {
1800     MatroskaDemuxContext *matroska = s->priv_data;
1801
1802     while (matroska_deliver_packet(matroska, pkt)) {
1803         if (matroska->done)
1804             return AVERROR_EOF;
1805         matroska_parse_cluster(matroska);
1806     }
1807
1808     return 0;
1809 }
1810
1811 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1812                               int64_t timestamp, int flags)
1813 {
1814     MatroskaDemuxContext *matroska = s->priv_data;
1815     MatroskaTrack *tracks = matroska->tracks.elem;
1816     AVStream *st = s->streams[stream_index];
1817     int i, index, index_sub, index_min;
1818
1819     if (!st->nb_index_entries)
1820         return 0;
1821     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1822
1823     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1824         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1825         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1826             matroska_clear_queue(matroska);
1827             if (matroska_parse_cluster(matroska) < 0)
1828                 break;
1829         }
1830     }
1831
1832     matroska_clear_queue(matroska);
1833     if (index < 0)
1834         return 0;
1835
1836     index_min = index;
1837     for (i=0; i < matroska->tracks.nb_elem; i++) {
1838         tracks[i].end_timecode = 0;
1839         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1840             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1841             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1842             if (index_sub >= 0
1843                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1844                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1845                 index_min = index_sub;
1846         }
1847     }
1848
1849     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1850     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1851     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1852     matroska->done = 0;
1853     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1854     return 0;
1855 }
1856
1857 static int matroska_read_close(AVFormatContext *s)
1858 {
1859     MatroskaDemuxContext *matroska = s->priv_data;
1860     MatroskaTrack *tracks = matroska->tracks.elem;
1861     int n;
1862
1863     matroska_clear_queue(matroska);
1864
1865     for (n=0; n < matroska->tracks.nb_elem; n++)
1866         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1867             av_free(tracks[n].audio.buf);
1868     ebml_free(matroska_segment, matroska);
1869
1870     return 0;
1871 }
1872
1873 AVInputFormat matroska_demuxer = {
1874     "matroska",
1875     NULL_IF_CONFIG_SMALL("Matroska file format"),
1876     sizeof(MatroskaDemuxContext),
1877     matroska_probe,
1878     matroska_read_header,
1879     matroska_read_packet,
1880     matroska_read_close,
1881     matroska_read_seek,
1882     .metadata_conv = ff_mkv_metadata_conv,
1883 };