matroskadec: fix handling of A_MS/ACM track with no extradata
[ffmpeg.git] / libavformat / matroskadec.c
1 /*
2  * Matroska file demuxer
3  * Copyright (c) 2003-2008 The FFmpeg Project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file libavformat/matroskadec.c
24  * Matroska file demuxer
25  * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26  * with a little help from Moritz Bunkus <moritz@bunkus.org>
27  * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28  * Specs available on the Matroska project page: http://www.matroska.org/.
29  */
30
31 #include <stdio.h>
32 #include "avformat.h"
33 /* For ff_codec_get_id(). */
34 #include "riff.h"
35 #include "isom.h"
36 #include "matroska.h"
37 #include "libavcodec/mpeg4audio.h"
38 #include "libavutil/intfloat_readwrite.h"
39 #include "libavutil/intreadwrite.h"
40 #include "libavutil/avstring.h"
41 #include "libavutil/lzo.h"
42 #if CONFIG_ZLIB
43 #include <zlib.h>
44 #endif
45 #if CONFIG_BZLIB
46 #include <bzlib.h>
47 #endif
48
49 typedef enum {
50     EBML_NONE,
51     EBML_UINT,
52     EBML_FLOAT,
53     EBML_STR,
54     EBML_UTF8,
55     EBML_BIN,
56     EBML_NEST,
57     EBML_PASS,
58     EBML_STOP,
59 } EbmlType;
60
61 typedef const struct EbmlSyntax {
62     uint32_t id;
63     EbmlType type;
64     int list_elem_size;
65     int data_offset;
66     union {
67         uint64_t    u;
68         double      f;
69         const char *s;
70         const struct EbmlSyntax *n;
71     } def;
72 } EbmlSyntax;
73
74 typedef struct {
75     int nb_elem;
76     void *elem;
77 } EbmlList;
78
79 typedef struct {
80     int      size;
81     uint8_t *data;
82     int64_t  pos;
83 } EbmlBin;
84
85 typedef struct {
86     uint64_t version;
87     uint64_t max_size;
88     uint64_t id_length;
89     char    *doctype;
90     uint64_t doctype_version;
91 } Ebml;
92
93 typedef struct {
94     uint64_t algo;
95     EbmlBin  settings;
96 } MatroskaTrackCompression;
97
98 typedef struct {
99     uint64_t scope;
100     uint64_t type;
101     MatroskaTrackCompression compression;
102 } MatroskaTrackEncoding;
103
104 typedef struct {
105     double   frame_rate;
106     uint64_t display_width;
107     uint64_t display_height;
108     uint64_t pixel_width;
109     uint64_t pixel_height;
110     uint64_t fourcc;
111 } MatroskaTrackVideo;
112
113 typedef struct {
114     double   samplerate;
115     double   out_samplerate;
116     uint64_t bitdepth;
117     uint64_t channels;
118
119     /* real audio header (extracted from extradata) */
120     int      coded_framesize;
121     int      sub_packet_h;
122     int      frame_size;
123     int      sub_packet_size;
124     int      sub_packet_cnt;
125     int      pkt_cnt;
126     uint8_t *buf;
127 } MatroskaTrackAudio;
128
129 typedef struct {
130     uint64_t num;
131     uint64_t uid;
132     uint64_t type;
133     char    *name;
134     char    *codec_id;
135     EbmlBin  codec_priv;
136     char    *language;
137     double time_scale;
138     uint64_t default_duration;
139     uint64_t flag_default;
140     MatroskaTrackVideo video;
141     MatroskaTrackAudio audio;
142     EbmlList encodings;
143
144     AVStream *stream;
145     int64_t end_timecode;
146 } MatroskaTrack;
147
148 typedef struct {
149     uint64_t uid;
150     char *filename;
151     char *mime;
152     EbmlBin bin;
153
154     AVStream *stream;
155 } MatroskaAttachement;
156
157 typedef struct {
158     uint64_t start;
159     uint64_t end;
160     uint64_t uid;
161     char    *title;
162
163     AVChapter *chapter;
164 } MatroskaChapter;
165
166 typedef struct {
167     uint64_t track;
168     uint64_t pos;
169 } MatroskaIndexPos;
170
171 typedef struct {
172     uint64_t time;
173     EbmlList pos;
174 } MatroskaIndex;
175
176 typedef struct {
177     char *name;
178     char *string;
179     char *lang;
180     uint64_t def;
181     EbmlList sub;
182 } MatroskaTag;
183
184 typedef struct {
185     char    *type;
186     uint64_t typevalue;
187     uint64_t trackuid;
188     uint64_t chapteruid;
189     uint64_t attachuid;
190 } MatroskaTagTarget;
191
192 typedef struct {
193     MatroskaTagTarget target;
194     EbmlList tag;
195 } MatroskaTags;
196
197 typedef struct {
198     uint64_t id;
199     uint64_t pos;
200 } MatroskaSeekhead;
201
202 typedef struct {
203     uint64_t start;
204     uint64_t length;
205 } MatroskaLevel;
206
207 typedef struct {
208     AVFormatContext *ctx;
209
210     /* EBML stuff */
211     int num_levels;
212     MatroskaLevel levels[EBML_MAX_DEPTH];
213     int level_up;
214
215     uint64_t time_scale;
216     double   duration;
217     char    *title;
218     EbmlList tracks;
219     EbmlList attachments;
220     EbmlList chapters;
221     EbmlList index;
222     EbmlList tags;
223     EbmlList seekhead;
224
225     /* byte position of the segment inside the stream */
226     int64_t segment_start;
227
228     /* the packet queue */
229     AVPacket **packets;
230     int num_packets;
231     AVPacket *prev_pkt;
232
233     int done;
234     int has_cluster_id;
235
236     /* What to skip before effectively reading a packet. */
237     int skip_to_keyframe;
238     uint64_t skip_to_timecode;
239 } MatroskaDemuxContext;
240
241 typedef struct {
242     uint64_t duration;
243     int64_t  reference;
244     uint64_t non_simple;
245     EbmlBin  bin;
246 } MatroskaBlock;
247
248 typedef struct {
249     uint64_t timecode;
250     EbmlList blocks;
251 } MatroskaCluster;
252
253 static EbmlSyntax ebml_header[] = {
254     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
255     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
256     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
257     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
258     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
259     { EBML_ID_EBMLVERSION,            EBML_NONE },
260     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
261     { 0 }
262 };
263
264 static EbmlSyntax ebml_syntax[] = {
265     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
266     { 0 }
267 };
268
269 static EbmlSyntax matroska_info[] = {
270     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
271     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
272     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
273     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
274     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
275     { MATROSKA_ID_DATEUTC,            EBML_NONE },
276     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
277     { 0 }
278 };
279
280 static EbmlSyntax matroska_track_video[] = {
281     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
282     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
283     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
284     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
285     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
286     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
287     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
288     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
289     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
290     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
291     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
292     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
293     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
294     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
295     { 0 }
296 };
297
298 static EbmlSyntax matroska_track_audio[] = {
299     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
300     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
301     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
302     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
303     { 0 }
304 };
305
306 static EbmlSyntax matroska_track_encoding_compression[] = {
307     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
308     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
309     { 0 }
310 };
311
312 static EbmlSyntax matroska_track_encoding[] = {
313     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
314     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
315     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
316     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
317     { 0 }
318 };
319
320 static EbmlSyntax matroska_track_encodings[] = {
321     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
322     { 0 }
323 };
324
325 static EbmlSyntax matroska_track[] = {
326     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
327     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
328     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
329     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
330     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
331     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
332     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
333     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
334     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
335     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
336     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
337     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
338     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
339     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
340     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
341     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
342     { MATROSKA_ID_CODECNAME,            EBML_NONE },
343     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
344     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
345     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
346     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
347     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
348     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
349     { 0 }
350 };
351
352 static EbmlSyntax matroska_tracks[] = {
353     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
354     { 0 }
355 };
356
357 static EbmlSyntax matroska_attachment[] = {
358     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
359     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
360     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
361     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
362     { MATROSKA_ID_FILEDESC,           EBML_NONE },
363     { 0 }
364 };
365
366 static EbmlSyntax matroska_attachments[] = {
367     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
368     { 0 }
369 };
370
371 static EbmlSyntax matroska_chapter_display[] = {
372     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
373     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
374     { 0 }
375 };
376
377 static EbmlSyntax matroska_chapter_entry[] = {
378     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
379     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
380     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
381     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
382     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
383     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
384     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
385     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
386     { 0 }
387 };
388
389 static EbmlSyntax matroska_chapter[] = {
390     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
391     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
392     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
393     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
394     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
395     { 0 }
396 };
397
398 static EbmlSyntax matroska_chapters[] = {
399     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
400     { 0 }
401 };
402
403 static EbmlSyntax matroska_index_pos[] = {
404     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
405     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
406     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
407     { 0 }
408 };
409
410 static EbmlSyntax matroska_index_entry[] = {
411     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
412     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
413     { 0 }
414 };
415
416 static EbmlSyntax matroska_index[] = {
417     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
418     { 0 }
419 };
420
421 static EbmlSyntax matroska_simpletag[] = {
422     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
423     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
424     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
425     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
426     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
427     { 0 }
428 };
429
430 static EbmlSyntax matroska_tagtargets[] = {
431     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
432     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
433     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
434     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
435     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
436     { 0 }
437 };
438
439 static EbmlSyntax matroska_tag[] = {
440     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
441     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
442     { 0 }
443 };
444
445 static EbmlSyntax matroska_tags[] = {
446     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
447     { 0 }
448 };
449
450 static EbmlSyntax matroska_seekhead_entry[] = {
451     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
452     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
453     { 0 }
454 };
455
456 static EbmlSyntax matroska_seekhead[] = {
457     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
458     { 0 }
459 };
460
461 static EbmlSyntax matroska_segment[] = {
462     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
463     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
464     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
465     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
466     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
467     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
468     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
469     { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
470     { 0 }
471 };
472
473 static EbmlSyntax matroska_segments[] = {
474     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
475     { 0 }
476 };
477
478 static EbmlSyntax matroska_blockgroup[] = {
479     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
480     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
481     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
482     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
483     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
484     { 0 }
485 };
486
487 static EbmlSyntax matroska_cluster[] = {
488     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
489     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
490     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
491     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
492     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
493     { 0 }
494 };
495
496 static EbmlSyntax matroska_clusters[] = {
497     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
498     { MATROSKA_ID_INFO,           EBML_NONE },
499     { MATROSKA_ID_CUES,           EBML_NONE },
500     { MATROSKA_ID_TAGS,           EBML_NONE },
501     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
502     { 0 }
503 };
504
505 /*
506  * Return: Whether we reached the end of a level in the hierarchy or not.
507  */
508 static int ebml_level_end(MatroskaDemuxContext *matroska)
509 {
510     ByteIOContext *pb = matroska->ctx->pb;
511     int64_t pos = url_ftell(pb);
512
513     if (matroska->num_levels > 0) {
514         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
515         if (pos - level->start >= level->length) {
516             matroska->num_levels--;
517             return 1;
518         }
519     }
520     return 0;
521 }
522
523 /*
524  * Read: an "EBML number", which is defined as a variable-length
525  * array of bytes. The first byte indicates the length by giving a
526  * number of 0-bits followed by a one. The position of the first
527  * "one" bit inside the first byte indicates the length of this
528  * number.
529  * Returns: number of bytes read, < 0 on error
530  */
531 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
532                          int max_size, uint64_t *number)
533 {
534     int len_mask = 0x80, read = 1, n = 1;
535     int64_t total = 0;
536
537     /* The first byte tells us the length in bytes - get_byte() can normally
538      * return 0, but since that's not a valid first ebmlID byte, we can
539      * use it safely here to catch EOS. */
540     if (!(total = get_byte(pb))) {
541         /* we might encounter EOS here */
542         if (!url_feof(pb)) {
543             int64_t pos = url_ftell(pb);
544             av_log(matroska->ctx, AV_LOG_ERROR,
545                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
546                    pos, pos);
547         }
548         return AVERROR(EIO); /* EOS or actual I/O error */
549     }
550
551     /* get the length of the EBML number */
552     while (read <= max_size && !(total & len_mask)) {
553         read++;
554         len_mask >>= 1;
555     }
556     if (read > max_size) {
557         int64_t pos = url_ftell(pb) - 1;
558         av_log(matroska->ctx, AV_LOG_ERROR,
559                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
560                (uint8_t) total, pos, pos);
561         return AVERROR_INVALIDDATA;
562     }
563
564     /* read out length */
565     total &= ~len_mask;
566     while (n++ < read)
567         total = (total << 8) | get_byte(pb);
568
569     *number = total;
570
571     return read;
572 }
573
574 /*
575  * Read the next element as an unsigned int.
576  * 0 is success, < 0 is failure.
577  */
578 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
579 {
580     int n = 0;
581
582     if (size < 1 || size > 8)
583         return AVERROR_INVALIDDATA;
584
585     /* big-endian ordering; build up number */
586     *num = 0;
587     while (n++ < size)
588         *num = (*num << 8) | get_byte(pb);
589
590     return 0;
591 }
592
593 /*
594  * Read the next element as a float.
595  * 0 is success, < 0 is failure.
596  */
597 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
598 {
599     if (size == 4) {
600         *num= av_int2flt(get_be32(pb));
601     } else if(size==8){
602         *num= av_int2dbl(get_be64(pb));
603     } else
604         return AVERROR_INVALIDDATA;
605
606     return 0;
607 }
608
609 /*
610  * Read the next element as an ASCII string.
611  * 0 is success, < 0 is failure.
612  */
613 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
614 {
615     av_free(*str);
616     /* EBML strings are usually not 0-terminated, so we allocate one
617      * byte more, read the string and NULL-terminate it ourselves. */
618     if (!(*str = av_malloc(size + 1)))
619         return AVERROR(ENOMEM);
620     if (get_buffer(pb, (uint8_t *) *str, size) != size) {
621         av_free(*str);
622         return AVERROR(EIO);
623     }
624     (*str)[size] = '\0';
625
626     return 0;
627 }
628
629 /*
630  * Read the next element as binary data.
631  * 0 is success, < 0 is failure.
632  */
633 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
634 {
635     av_free(bin->data);
636     if (!(bin->data = av_malloc(length)))
637         return AVERROR(ENOMEM);
638
639     bin->size = length;
640     bin->pos  = url_ftell(pb);
641     if (get_buffer(pb, bin->data, length) != length)
642         return AVERROR(EIO);
643
644     return 0;
645 }
646
647 /*
648  * Read the next element, but only the header. The contents
649  * are supposed to be sub-elements which can be read separately.
650  * 0 is success, < 0 is failure.
651  */
652 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
653 {
654     ByteIOContext *pb = matroska->ctx->pb;
655     MatroskaLevel *level;
656
657     if (matroska->num_levels >= EBML_MAX_DEPTH) {
658         av_log(matroska->ctx, AV_LOG_ERROR,
659                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
660         return AVERROR(ENOSYS);
661     }
662
663     level = &matroska->levels[matroska->num_levels++];
664     level->start = url_ftell(pb);
665     level->length = length;
666
667     return 0;
668 }
669
670 /*
671  * Read signed/unsigned "EBML" numbers.
672  * Return: number of bytes processed, < 0 on error
673  */
674 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
675                                  uint8_t *data, uint32_t size, uint64_t *num)
676 {
677     ByteIOContext pb;
678     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
679     return ebml_read_num(matroska, &pb, 8, num);
680 }
681
682 /*
683  * Same as above, but signed.
684  */
685 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
686                                  uint8_t *data, uint32_t size, int64_t *num)
687 {
688     uint64_t unum;
689     int res;
690
691     /* read as unsigned number first */
692     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
693         return res;
694
695     /* make signed (weird way) */
696     *num = unum - ((1LL << (7*res - 1)) - 1);
697
698     return res;
699 }
700
701 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
702                            EbmlSyntax *syntax, void *data);
703
704 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
705                          uint32_t id, void *data)
706 {
707     int i;
708     for (i=0; syntax[i].id; i++)
709         if (id == syntax[i].id)
710             break;
711     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
712         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
713     return ebml_parse_elem(matroska, &syntax[i], data);
714 }
715
716 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
717                       void *data)
718 {
719     uint64_t id;
720     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
721     id |= 1 << 7*res;
722     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
723 }
724
725 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
726                            void *data)
727 {
728     int i, res = 0;
729
730     for (i=0; syntax[i].id; i++)
731         switch (syntax[i].type) {
732         case EBML_UINT:
733             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
734             break;
735         case EBML_FLOAT:
736             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
737             break;
738         case EBML_STR:
739         case EBML_UTF8:
740             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
741             break;
742         }
743
744     while (!res && !ebml_level_end(matroska))
745         res = ebml_parse(matroska, syntax, data);
746
747     return res;
748 }
749
750 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
751                            EbmlSyntax *syntax, void *data)
752 {
753     ByteIOContext *pb = matroska->ctx->pb;
754     uint32_t id = syntax->id;
755     uint64_t length;
756     int res;
757
758     data = (char *)data + syntax->data_offset;
759     if (syntax->list_elem_size) {
760         EbmlList *list = data;
761         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
762         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
763         memset(data, 0, syntax->list_elem_size);
764         list->nb_elem++;
765     }
766
767     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
768         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
769             return res;
770
771     switch (syntax->type) {
772     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
773     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
774     case EBML_STR:
775     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
776     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
777     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
778                          return res;
779                      if (id == MATROSKA_ID_SEGMENT)
780                          matroska->segment_start = url_ftell(matroska->ctx->pb);
781                      return ebml_parse_nest(matroska, syntax->def.n, data);
782     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
783     case EBML_STOP:  *(int *)data = 1;      return 1;
784     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
785     }
786     if (res == AVERROR_INVALIDDATA)
787         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
788     else if (res == AVERROR(EIO))
789         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
790     return res;
791 }
792
793 static void ebml_free(EbmlSyntax *syntax, void *data)
794 {
795     int i, j;
796     for (i=0; syntax[i].id; i++) {
797         void *data_off = (char *)data + syntax[i].data_offset;
798         switch (syntax[i].type) {
799         case EBML_STR:
800         case EBML_UTF8:  av_freep(data_off);                      break;
801         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
802         case EBML_NEST:
803             if (syntax[i].list_elem_size) {
804                 EbmlList *list = data_off;
805                 char *ptr = list->elem;
806                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
807                     ebml_free(syntax[i].def.n, ptr);
808                 av_free(list->elem);
809             } else
810                 ebml_free(syntax[i].def.n, data_off);
811         default:  break;
812         }
813     }
814 }
815
816
817 /*
818  * Autodetecting...
819  */
820 static int matroska_probe(AVProbeData *p)
821 {
822     uint64_t total = 0;
823     int len_mask = 0x80, size = 1, n = 1;
824     static const char probe_data[] = "matroska";
825
826     /* EBML header? */
827     if (AV_RB32(p->buf) != EBML_ID_HEADER)
828         return 0;
829
830     /* length of header */
831     total = p->buf[4];
832     while (size <= 8 && !(total & len_mask)) {
833         size++;
834         len_mask >>= 1;
835     }
836     if (size > 8)
837       return 0;
838     total &= (len_mask - 1);
839     while (n < size)
840         total = (total << 8) | p->buf[4 + n++];
841
842     /* Does the probe data contain the whole header? */
843     if (p->buf_size < 4 + size + total)
844       return 0;
845
846     /* The header must contain the document type 'matroska'. For now,
847      * we don't parse the whole header but simply check for the
848      * availability of that array of characters inside the header.
849      * Not fully fool-proof, but good enough. */
850     for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
851         if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
852             return AVPROBE_SCORE_MAX;
853
854     return 0;
855 }
856
857 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
858                                                  int num)
859 {
860     MatroskaTrack *tracks = matroska->tracks.elem;
861     int i;
862
863     for (i=0; i < matroska->tracks.nb_elem; i++)
864         if (tracks[i].num == num)
865             return &tracks[i];
866
867     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
868     return NULL;
869 }
870
871 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
872                                   MatroskaTrack *track)
873 {
874     MatroskaTrackEncoding *encodings = track->encodings.elem;
875     uint8_t* data = *buf;
876     int isize = *buf_size;
877     uint8_t* pkt_data = NULL;
878     int pkt_size = isize;
879     int result = 0;
880     int olen;
881
882     switch (encodings[0].compression.algo) {
883     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
884         return encodings[0].compression.settings.size;
885     case MATROSKA_TRACK_ENCODING_COMP_LZO:
886         do {
887             olen = pkt_size *= 3;
888             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
889             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
890         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
891         if (result)
892             goto failed;
893         pkt_size -= olen;
894         break;
895 #if CONFIG_ZLIB
896     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
897         z_stream zstream = {0};
898         if (inflateInit(&zstream) != Z_OK)
899             return -1;
900         zstream.next_in = data;
901         zstream.avail_in = isize;
902         do {
903             pkt_size *= 3;
904             pkt_data = av_realloc(pkt_data, pkt_size);
905             zstream.avail_out = pkt_size - zstream.total_out;
906             zstream.next_out = pkt_data + zstream.total_out;
907             result = inflate(&zstream, Z_NO_FLUSH);
908         } while (result==Z_OK && pkt_size<10000000);
909         pkt_size = zstream.total_out;
910         inflateEnd(&zstream);
911         if (result != Z_STREAM_END)
912             goto failed;
913         break;
914     }
915 #endif
916 #if CONFIG_BZLIB
917     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
918         bz_stream bzstream = {0};
919         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
920             return -1;
921         bzstream.next_in = data;
922         bzstream.avail_in = isize;
923         do {
924             pkt_size *= 3;
925             pkt_data = av_realloc(pkt_data, pkt_size);
926             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
927             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
928             result = BZ2_bzDecompress(&bzstream);
929         } while (result==BZ_OK && pkt_size<10000000);
930         pkt_size = bzstream.total_out_lo32;
931         BZ2_bzDecompressEnd(&bzstream);
932         if (result != BZ_STREAM_END)
933             goto failed;
934         break;
935     }
936 #endif
937     default:
938         return -1;
939     }
940
941     *buf = pkt_data;
942     *buf_size = pkt_size;
943     return 0;
944  failed:
945     av_free(pkt_data);
946     return -1;
947 }
948
949 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
950                                     AVPacket *pkt, uint64_t display_duration)
951 {
952     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
953     for (; *ptr!=',' && ptr<end-1; ptr++);
954     if (*ptr == ',')
955         layer = ++ptr;
956     for (; *ptr!=',' && ptr<end-1; ptr++);
957     if (*ptr == ',') {
958         int64_t end_pts = pkt->pts + display_duration;
959         int sc = matroska->time_scale * pkt->pts / 10000000;
960         int ec = matroska->time_scale * end_pts  / 10000000;
961         int sh, sm, ss, eh, em, es, len;
962         sh = sc/360000;  sc -= 360000*sh;
963         sm = sc/  6000;  sc -=   6000*sm;
964         ss = sc/   100;  sc -=    100*ss;
965         eh = ec/360000;  ec -= 360000*eh;
966         em = ec/  6000;  ec -=   6000*em;
967         es = ec/   100;  ec -=    100*es;
968         *ptr++ = '\0';
969         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
970         if (!(line = av_malloc(len)))
971             return;
972         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
973                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
974         av_free(pkt->data);
975         pkt->data = line;
976         pkt->size = strlen(line);
977     }
978 }
979
980 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
981 {
982     out->data = av_realloc(out->data, out->size+in->size);
983     memcpy(out->data+out->size, in->data, in->size);
984     out->size += in->size;
985     av_destruct_packet(in);
986     av_free(in);
987 }
988
989 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
990                                  AVMetadata **metadata, char *prefix)
991 {
992     MatroskaTag *tags = list->elem;
993     char key[1024];
994     int i;
995
996     for (i=0; i < list->nb_elem; i++) {
997         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
998         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
999         else         av_strlcpy(key, tags[i].name, sizeof(key));
1000         if (tags[i].def || !lang) {
1001         av_metadata_set(metadata, key, tags[i].string);
1002         if (tags[i].sub.nb_elem)
1003             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1004         }
1005         if (lang) {
1006             av_strlcat(key, "-", sizeof(key));
1007             av_strlcat(key, lang, sizeof(key));
1008             av_metadata_set(metadata, key, tags[i].string);
1009             if (tags[i].sub.nb_elem)
1010                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1011         }
1012     }
1013 }
1014
1015 static void matroska_convert_tags(AVFormatContext *s)
1016 {
1017     MatroskaDemuxContext *matroska = s->priv_data;
1018     MatroskaTags *tags = matroska->tags.elem;
1019     int i, j;
1020
1021     for (i=0; i < matroska->tags.nb_elem; i++) {
1022         if (tags[i].target.attachuid) {
1023             MatroskaAttachement *attachment = matroska->attachments.elem;
1024             for (j=0; j<matroska->attachments.nb_elem; j++)
1025                 if (attachment[j].uid == tags[i].target.attachuid)
1026                     matroska_convert_tag(s, &tags[i].tag,
1027                                          &attachment[j].stream->metadata, NULL);
1028         } else if (tags[i].target.chapteruid) {
1029             MatroskaChapter *chapter = matroska->chapters.elem;
1030             for (j=0; j<matroska->chapters.nb_elem; j++)
1031                 if (chapter[j].uid == tags[i].target.chapteruid)
1032                     matroska_convert_tag(s, &tags[i].tag,
1033                                          &chapter[j].chapter->metadata, NULL);
1034         } else if (tags[i].target.trackuid) {
1035             MatroskaTrack *track = matroska->tracks.elem;
1036             for (j=0; j<matroska->tracks.nb_elem; j++)
1037                 if (track[j].uid == tags[i].target.trackuid)
1038                     matroska_convert_tag(s, &tags[i].tag,
1039                                          &track[j].stream->metadata, NULL);
1040         } else {
1041             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1042                                  tags[i].target.type);
1043         }
1044     }
1045 }
1046
1047 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1048 {
1049     EbmlList *seekhead_list = &matroska->seekhead;
1050     MatroskaSeekhead *seekhead = seekhead_list->elem;
1051     uint32_t level_up = matroska->level_up;
1052     int64_t before_pos = url_ftell(matroska->ctx->pb);
1053     MatroskaLevel level;
1054     int i;
1055
1056     for (i=0; i<seekhead_list->nb_elem; i++) {
1057         int64_t offset = seekhead[i].pos + matroska->segment_start;
1058
1059         if (seekhead[i].pos <= before_pos
1060             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1061             || seekhead[i].id == MATROSKA_ID_CLUSTER)
1062             continue;
1063
1064         /* seek */
1065         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1066             continue;
1067
1068         /* We don't want to lose our seekhead level, so we add
1069          * a dummy. This is a crude hack. */
1070         if (matroska->num_levels == EBML_MAX_DEPTH) {
1071             av_log(matroska->ctx, AV_LOG_INFO,
1072                    "Max EBML element depth (%d) reached, "
1073                    "cannot parse further.\n", EBML_MAX_DEPTH);
1074             break;
1075         }
1076
1077         level.start = 0;
1078         level.length = (uint64_t)-1;
1079         matroska->levels[matroska->num_levels] = level;
1080         matroska->num_levels++;
1081
1082         ebml_parse(matroska, matroska_segment, matroska);
1083
1084         /* remove dummy level */
1085         while (matroska->num_levels) {
1086             uint64_t length = matroska->levels[--matroska->num_levels].length;
1087             if (length == (uint64_t)-1)
1088                 break;
1089         }
1090     }
1091
1092     /* seek back */
1093     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1094     matroska->level_up = level_up;
1095 }
1096
1097 static int matroska_aac_profile(char *codec_id)
1098 {
1099     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1100     int profile;
1101
1102     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1103         if (strstr(codec_id, aac_profiles[profile]))
1104             break;
1105     return profile + 1;
1106 }
1107
1108 static int matroska_aac_sri(int samplerate)
1109 {
1110     int sri;
1111
1112     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1113         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1114             break;
1115     return sri;
1116 }
1117
1118 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1119 {
1120     MatroskaDemuxContext *matroska = s->priv_data;
1121     EbmlList *attachements_list = &matroska->attachments;
1122     MatroskaAttachement *attachements;
1123     EbmlList *chapters_list = &matroska->chapters;
1124     MatroskaChapter *chapters;
1125     MatroskaTrack *tracks;
1126     EbmlList *index_list;
1127     MatroskaIndex *index;
1128     int index_scale = 1;
1129     uint64_t max_start = 0;
1130     Ebml ebml = { 0 };
1131     AVStream *st;
1132     int i, j;
1133
1134     matroska->ctx = s;
1135
1136     /* First read the EBML header. */
1137     if (ebml_parse(matroska, ebml_syntax, &ebml)
1138         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1139         || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1140         || ebml.doctype_version > 2) {
1141         av_log(matroska->ctx, AV_LOG_ERROR,
1142                "EBML header using unsupported features\n"
1143                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1144                ebml.version, ebml.doctype, ebml.doctype_version);
1145         return AVERROR_NOFMT;
1146     }
1147     ebml_free(ebml_syntax, &ebml);
1148
1149     /* The next thing is a segment. */
1150     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1151         return -1;
1152     matroska_execute_seekhead(matroska);
1153
1154     if (matroska->duration)
1155         matroska->ctx->duration = matroska->duration * matroska->time_scale
1156                                   * 1000 / AV_TIME_BASE;
1157     av_metadata_set(&s->metadata, "title", matroska->title);
1158
1159     tracks = matroska->tracks.elem;
1160     for (i=0; i < matroska->tracks.nb_elem; i++) {
1161         MatroskaTrack *track = &tracks[i];
1162         enum CodecID codec_id = CODEC_ID_NONE;
1163         EbmlList *encodings_list = &tracks->encodings;
1164         MatroskaTrackEncoding *encodings = encodings_list->elem;
1165         uint8_t *extradata = NULL;
1166         int extradata_size = 0;
1167         int extradata_offset = 0;
1168         ByteIOContext b;
1169
1170         /* Apply some sanity checks. */
1171         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1172             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1173             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1174             av_log(matroska->ctx, AV_LOG_INFO,
1175                    "Unknown or unsupported track type %"PRIu64"\n",
1176                    track->type);
1177             continue;
1178         }
1179         if (track->codec_id == NULL)
1180             continue;
1181
1182         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1183             if (!track->default_duration)
1184                 track->default_duration = 1000000000/track->video.frame_rate;
1185             if (!track->video.display_width)
1186                 track->video.display_width = track->video.pixel_width;
1187             if (!track->video.display_height)
1188                 track->video.display_height = track->video.pixel_height;
1189         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1190             if (!track->audio.out_samplerate)
1191                 track->audio.out_samplerate = track->audio.samplerate;
1192         }
1193         if (encodings_list->nb_elem > 1) {
1194             av_log(matroska->ctx, AV_LOG_ERROR,
1195                    "Multiple combined encodings no supported");
1196         } else if (encodings_list->nb_elem == 1) {
1197             if (encodings[0].type ||
1198                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1199 #if CONFIG_ZLIB
1200                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1201 #endif
1202 #if CONFIG_BZLIB
1203                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1204 #endif
1205                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1206                 encodings[0].scope = 0;
1207                 av_log(matroska->ctx, AV_LOG_ERROR,
1208                        "Unsupported encoding type");
1209             } else if (track->codec_priv.size && encodings[0].scope&2) {
1210                 uint8_t *codec_priv = track->codec_priv.data;
1211                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1212                                                     &track->codec_priv.size,
1213                                                     track);
1214                 if (offset < 0) {
1215                     track->codec_priv.data = NULL;
1216                     track->codec_priv.size = 0;
1217                     av_log(matroska->ctx, AV_LOG_ERROR,
1218                            "Failed to decode codec private data\n");
1219                 } else if (offset > 0) {
1220                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1221                     memcpy(track->codec_priv.data,
1222                            encodings[0].compression.settings.data, offset);
1223                     memcpy(track->codec_priv.data+offset, codec_priv,
1224                            track->codec_priv.size);
1225                     track->codec_priv.size += offset;
1226                 }
1227                 if (codec_priv != track->codec_priv.data)
1228                     av_free(codec_priv);
1229             }
1230         }
1231
1232         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1233             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1234                         strlen(ff_mkv_codec_tags[j].str))){
1235                 codec_id= ff_mkv_codec_tags[j].id;
1236                 break;
1237             }
1238         }
1239
1240         st = track->stream = av_new_stream(s, 0);
1241         if (st == NULL)
1242             return AVERROR(ENOMEM);
1243
1244         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1245             && track->codec_priv.size >= 40
1246             && track->codec_priv.data != NULL) {
1247             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1248             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1249             extradata_offset = 40;
1250         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1251                    && track->codec_priv.size >= 14
1252                    && track->codec_priv.data != NULL) {
1253             init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1254                           URL_RDONLY, NULL, NULL, NULL, NULL);
1255             ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1256             codec_id = st->codec->codec_id;
1257             extradata_offset = FFMIN(track->codec_priv.size, 18);
1258         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1259                    && (track->codec_priv.size >= 86)
1260                    && (track->codec_priv.data != NULL)) {
1261             track->video.fourcc = AV_RL32(track->codec_priv.data);
1262             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1263         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1264             switch (track->audio.bitdepth) {
1265             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1266             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1267             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1268             }
1269         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1270             switch (track->audio.bitdepth) {
1271             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1272             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1273             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1274             }
1275         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1276             codec_id = CODEC_ID_PCM_F64LE;
1277         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1278             int profile = matroska_aac_profile(track->codec_id);
1279             int sri = matroska_aac_sri(track->audio.samplerate);
1280             extradata = av_malloc(5);
1281             if (extradata == NULL)
1282                 return AVERROR(ENOMEM);
1283             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1284             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1285             if (strstr(track->codec_id, "SBR")) {
1286                 sri = matroska_aac_sri(track->audio.out_samplerate);
1287                 extradata[2] = 0x56;
1288                 extradata[3] = 0xE5;
1289                 extradata[4] = 0x80 | (sri<<3);
1290                 extradata_size = 5;
1291             } else
1292                 extradata_size = 2;
1293         } else if (codec_id == CODEC_ID_TTA) {
1294             extradata_size = 30;
1295             extradata = av_mallocz(extradata_size);
1296             if (extradata == NULL)
1297                 return AVERROR(ENOMEM);
1298             init_put_byte(&b, extradata, extradata_size, 1,
1299                           NULL, NULL, NULL, NULL);
1300             put_buffer(&b, "TTA1", 4);
1301             put_le16(&b, 1);
1302             put_le16(&b, track->audio.channels);
1303             put_le16(&b, track->audio.bitdepth);
1304             put_le32(&b, track->audio.out_samplerate);
1305             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1306         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1307                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1308             extradata_offset = 26;
1309         } else if (codec_id == CODEC_ID_RA_144) {
1310             track->audio.out_samplerate = 8000;
1311             track->audio.channels = 1;
1312         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1313                    codec_id == CODEC_ID_ATRAC3) {
1314             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1315                           0, NULL, NULL, NULL, NULL);
1316             url_fskip(&b, 24);
1317             track->audio.coded_framesize = get_be32(&b);
1318             url_fskip(&b, 12);
1319             track->audio.sub_packet_h    = get_be16(&b);
1320             track->audio.frame_size      = get_be16(&b);
1321             track->audio.sub_packet_size = get_be16(&b);
1322             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1323             if (codec_id == CODEC_ID_RA_288) {
1324                 st->codec->block_align = track->audio.coded_framesize;
1325                 track->codec_priv.size = 0;
1326             } else {
1327                 st->codec->block_align = track->audio.sub_packet_size;
1328                 extradata_offset = 78;
1329             }
1330         }
1331         track->codec_priv.size -= extradata_offset;
1332
1333         if (codec_id == CODEC_ID_NONE)
1334             av_log(matroska->ctx, AV_LOG_INFO,
1335                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1336
1337         if (track->time_scale < 0.01)
1338             track->time_scale = 1.0;
1339         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1340
1341         st->codec->codec_id = codec_id;
1342         st->start_time = 0;
1343         if (strcmp(track->language, "und"))
1344             av_metadata_set(&st->metadata, "language", track->language);
1345         av_metadata_set(&st->metadata, "description", track->name);
1346
1347         if (track->flag_default)
1348             st->disposition |= AV_DISPOSITION_DEFAULT;
1349
1350         if (track->default_duration)
1351             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1352                       track->default_duration, 1000000000, 30000);
1353
1354         if(extradata){
1355             st->codec->extradata = extradata;
1356             st->codec->extradata_size = extradata_size;
1357         } else if(track->codec_priv.data && track->codec_priv.size > 0){
1358             st->codec->extradata = av_mallocz(track->codec_priv.size +
1359                                               FF_INPUT_BUFFER_PADDING_SIZE);
1360             if(st->codec->extradata == NULL)
1361                 return AVERROR(ENOMEM);
1362             st->codec->extradata_size = track->codec_priv.size;
1363             memcpy(st->codec->extradata,
1364                    track->codec_priv.data + extradata_offset,
1365                    track->codec_priv.size);
1366         }
1367
1368         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1369             st->codec->codec_type = CODEC_TYPE_VIDEO;
1370             st->codec->codec_tag  = track->video.fourcc;
1371             st->codec->width  = track->video.pixel_width;
1372             st->codec->height = track->video.pixel_height;
1373             av_reduce(&st->sample_aspect_ratio.num,
1374                       &st->sample_aspect_ratio.den,
1375                       st->codec->height * track->video.display_width,
1376                       st->codec-> width * track->video.display_height,
1377                       255);
1378             if (st->codec->codec_id != CODEC_ID_H264)
1379             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1380         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1381             st->codec->codec_type = CODEC_TYPE_AUDIO;
1382             st->codec->sample_rate = track->audio.out_samplerate;
1383             st->codec->channels = track->audio.channels;
1384         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1385             st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1386         }
1387     }
1388
1389     attachements = attachements_list->elem;
1390     for (j=0; j<attachements_list->nb_elem; j++) {
1391         if (!(attachements[j].filename && attachements[j].mime &&
1392               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1393             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1394         } else {
1395             AVStream *st = av_new_stream(s, 0);
1396             if (st == NULL)
1397                 break;
1398             av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1399             st->codec->codec_id = CODEC_ID_NONE;
1400             st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1401             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1402             if(st->codec->extradata == NULL)
1403                 break;
1404             st->codec->extradata_size = attachements[j].bin.size;
1405             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1406
1407             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1408                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1409                              strlen(ff_mkv_mime_tags[i].str))) {
1410                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1411                     break;
1412                 }
1413             }
1414             attachements[j].stream = st;
1415         }
1416     }
1417
1418     chapters = chapters_list->elem;
1419     for (i=0; i<chapters_list->nb_elem; i++)
1420         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1421             && (max_start==0 || chapters[i].start > max_start)) {
1422             chapters[i].chapter =
1423             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1424                            chapters[i].start, chapters[i].end,
1425                            chapters[i].title);
1426             av_metadata_set(&chapters[i].chapter->metadata,
1427                             "title", chapters[i].title);
1428             max_start = chapters[i].start;
1429         }
1430
1431     index_list = &matroska->index;
1432     index = index_list->elem;
1433     if (index_list->nb_elem
1434         && index[0].time > 100000000000000/matroska->time_scale) {
1435         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1436         index_scale = matroska->time_scale;
1437     }
1438     for (i=0; i<index_list->nb_elem; i++) {
1439         EbmlList *pos_list = &index[i].pos;
1440         MatroskaIndexPos *pos = pos_list->elem;
1441         for (j=0; j<pos_list->nb_elem; j++) {
1442             MatroskaTrack *track = matroska_find_track_by_num(matroska,
1443                                                               pos[j].track);
1444             if (track && track->stream)
1445                 av_add_index_entry(track->stream,
1446                                    pos[j].pos + matroska->segment_start,
1447                                    index[i].time/index_scale, 0, 0,
1448                                    AVINDEX_KEYFRAME);
1449         }
1450     }
1451
1452     matroska_convert_tags(s);
1453
1454     return 0;
1455 }
1456
1457 /*
1458  * Put one packet in an application-supplied AVPacket struct.
1459  * Returns 0 on success or -1 on failure.
1460  */
1461 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1462                                    AVPacket *pkt)
1463 {
1464     if (matroska->num_packets > 0) {
1465         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1466         av_free(matroska->packets[0]);
1467         if (matroska->num_packets > 1) {
1468             memmove(&matroska->packets[0], &matroska->packets[1],
1469                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1470             matroska->packets =
1471                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1472                            sizeof(AVPacket *));
1473         } else {
1474             av_freep(&matroska->packets);
1475         }
1476         matroska->num_packets--;
1477         return 0;
1478     }
1479
1480     return -1;
1481 }
1482
1483 /*
1484  * Free all packets in our internal queue.
1485  */
1486 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1487 {
1488     if (matroska->packets) {
1489         int n;
1490         for (n = 0; n < matroska->num_packets; n++) {
1491             av_free_packet(matroska->packets[n]);
1492             av_free(matroska->packets[n]);
1493         }
1494         av_freep(&matroska->packets);
1495         matroska->num_packets = 0;
1496     }
1497 }
1498
1499 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1500                                 int size, int64_t pos, uint64_t cluster_time,
1501                                 uint64_t duration, int is_keyframe,
1502                                 int64_t cluster_pos)
1503 {
1504     uint64_t timecode = AV_NOPTS_VALUE;
1505     MatroskaTrack *track;
1506     int res = 0;
1507     AVStream *st;
1508     AVPacket *pkt;
1509     int16_t block_time;
1510     uint32_t *lace_size = NULL;
1511     int n, flags, laces = 0;
1512     uint64_t num;
1513
1514     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1515         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1516         return res;
1517     }
1518     data += n;
1519     size -= n;
1520
1521     track = matroska_find_track_by_num(matroska, num);
1522     if (size <= 3 || !track || !track->stream) {
1523         av_log(matroska->ctx, AV_LOG_INFO,
1524                "Invalid stream %"PRIu64" or size %u\n", num, size);
1525         return res;
1526     }
1527     st = track->stream;
1528     if (st->discard >= AVDISCARD_ALL)
1529         return res;
1530     if (duration == AV_NOPTS_VALUE)
1531         duration = track->default_duration / matroska->time_scale;
1532
1533     block_time = AV_RB16(data);
1534     data += 2;
1535     flags = *data++;
1536     size -= 3;
1537     if (is_keyframe == -1)
1538         is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1539
1540     if (cluster_time != (uint64_t)-1
1541         && (block_time >= 0 || cluster_time >= -block_time)) {
1542         timecode = cluster_time + block_time;
1543         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1544             && timecode < track->end_timecode)
1545             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1546         if (is_keyframe)
1547             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1548         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1549     }
1550
1551     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1552         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1553             return res;
1554         matroska->skip_to_keyframe = 0;
1555     }
1556
1557     switch ((flags & 0x06) >> 1) {
1558         case 0x0: /* no lacing */
1559             laces = 1;
1560             lace_size = av_mallocz(sizeof(int));
1561             lace_size[0] = size;
1562             break;
1563
1564         case 0x1: /* Xiph lacing */
1565         case 0x2: /* fixed-size lacing */
1566         case 0x3: /* EBML lacing */
1567             assert(size>0); // size <=3 is checked before size-=3 above
1568             laces = (*data) + 1;
1569             data += 1;
1570             size -= 1;
1571             lace_size = av_mallocz(laces * sizeof(int));
1572
1573             switch ((flags & 0x06) >> 1) {
1574                 case 0x1: /* Xiph lacing */ {
1575                     uint8_t temp;
1576                     uint32_t total = 0;
1577                     for (n = 0; res == 0 && n < laces - 1; n++) {
1578                         while (1) {
1579                             if (size == 0) {
1580                                 res = -1;
1581                                 break;
1582                             }
1583                             temp = *data;
1584                             lace_size[n] += temp;
1585                             data += 1;
1586                             size -= 1;
1587                             if (temp != 0xff)
1588                                 break;
1589                         }
1590                         total += lace_size[n];
1591                     }
1592                     lace_size[n] = size - total;
1593                     break;
1594                 }
1595
1596                 case 0x2: /* fixed-size lacing */
1597                     for (n = 0; n < laces; n++)
1598                         lace_size[n] = size / laces;
1599                     break;
1600
1601                 case 0x3: /* EBML lacing */ {
1602                     uint32_t total;
1603                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1604                     if (n < 0) {
1605                         av_log(matroska->ctx, AV_LOG_INFO,
1606                                "EBML block data error\n");
1607                         break;
1608                     }
1609                     data += n;
1610                     size -= n;
1611                     total = lace_size[0] = num;
1612                     for (n = 1; res == 0 && n < laces - 1; n++) {
1613                         int64_t snum;
1614                         int r;
1615                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1616                         if (r < 0) {
1617                             av_log(matroska->ctx, AV_LOG_INFO,
1618                                    "EBML block data error\n");
1619                             break;
1620                         }
1621                         data += r;
1622                         size -= r;
1623                         lace_size[n] = lace_size[n - 1] + snum;
1624                         total += lace_size[n];
1625                     }
1626                     lace_size[n] = size - total;
1627                     break;
1628                 }
1629             }
1630             break;
1631     }
1632
1633     if (res == 0) {
1634         for (n = 0; n < laces; n++) {
1635             if (st->codec->codec_id == CODEC_ID_RA_288 ||
1636                 st->codec->codec_id == CODEC_ID_COOK ||
1637                 st->codec->codec_id == CODEC_ID_ATRAC3) {
1638                 int a = st->codec->block_align;
1639                 int sps = track->audio.sub_packet_size;
1640                 int cfs = track->audio.coded_framesize;
1641                 int h = track->audio.sub_packet_h;
1642                 int y = track->audio.sub_packet_cnt;
1643                 int w = track->audio.frame_size;
1644                 int x;
1645
1646                 if (!track->audio.pkt_cnt) {
1647                     if (st->codec->codec_id == CODEC_ID_RA_288)
1648                         for (x=0; x<h/2; x++)
1649                             memcpy(track->audio.buf+x*2*w+y*cfs,
1650                                    data+x*cfs, cfs);
1651                     else
1652                         for (x=0; x<w/sps; x++)
1653                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1654
1655                     if (++track->audio.sub_packet_cnt >= h) {
1656                         track->audio.sub_packet_cnt = 0;
1657                         track->audio.pkt_cnt = h*w / a;
1658                     }
1659                 }
1660                 while (track->audio.pkt_cnt) {
1661                     pkt = av_mallocz(sizeof(AVPacket));
1662                     av_new_packet(pkt, a);
1663                     memcpy(pkt->data, track->audio.buf
1664                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1665                     pkt->pos = pos;
1666                     pkt->stream_index = st->index;
1667                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1668                 }
1669             } else {
1670                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1671                 int offset = 0, pkt_size = lace_size[n];
1672                 uint8_t *pkt_data = data;
1673
1674                 if (encodings && encodings->scope & 1) {
1675                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1676                     if (offset < 0)
1677                         continue;
1678                 }
1679
1680                 pkt = av_mallocz(sizeof(AVPacket));
1681                 /* XXX: prevent data copy... */
1682                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1683                     av_free(pkt);
1684                     res = AVERROR(ENOMEM);
1685                     break;
1686                 }
1687                 if (offset)
1688                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1689                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1690
1691                 if (pkt_data != data)
1692                     av_free(pkt_data);
1693
1694                 if (n == 0)
1695                     pkt->flags = is_keyframe;
1696                 pkt->stream_index = st->index;
1697
1698                 pkt->pts = timecode;
1699                 pkt->pos = pos;
1700                 if (st->codec->codec_id == CODEC_ID_TEXT)
1701                     pkt->convergence_duration = duration;
1702                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1703                     pkt->duration = duration;
1704
1705                 if (st->codec->codec_id == CODEC_ID_SSA)
1706                     matroska_fix_ass_packet(matroska, pkt, duration);
1707
1708                 if (matroska->prev_pkt &&
1709                     timecode != AV_NOPTS_VALUE &&
1710                     matroska->prev_pkt->pts == timecode &&
1711                     matroska->prev_pkt->stream_index == st->index)
1712                     matroska_merge_packets(matroska->prev_pkt, pkt);
1713                 else {
1714                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1715                     matroska->prev_pkt = pkt;
1716                 }
1717             }
1718
1719             if (timecode != AV_NOPTS_VALUE)
1720                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1721             data += lace_size[n];
1722         }
1723     }
1724
1725     av_free(lace_size);
1726     return res;
1727 }
1728
1729 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1730 {
1731     MatroskaCluster cluster = { 0 };
1732     EbmlList *blocks_list;
1733     MatroskaBlock *blocks;
1734     int i, res;
1735     int64_t pos = url_ftell(matroska->ctx->pb);
1736     matroska->prev_pkt = NULL;
1737     if (matroska->has_cluster_id){
1738         /* For the first cluster we parse, its ID was already read as
1739            part of matroska_read_header(), so don't read it again */
1740         res = ebml_parse_id(matroska, matroska_clusters,
1741                             MATROSKA_ID_CLUSTER, &cluster);
1742         pos -= 4;  /* sizeof the ID which was already read */
1743         matroska->has_cluster_id = 0;
1744     } else
1745         res = ebml_parse(matroska, matroska_clusters, &cluster);
1746     blocks_list = &cluster.blocks;
1747     blocks = blocks_list->elem;
1748     for (i=0; i<blocks_list->nb_elem; i++)
1749         if (blocks[i].bin.size > 0) {
1750             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1751             res=matroska_parse_block(matroska,
1752                                      blocks[i].bin.data, blocks[i].bin.size,
1753                                      blocks[i].bin.pos,  cluster.timecode,
1754                                      blocks[i].duration, is_keyframe,
1755                                      pos);
1756         }
1757     ebml_free(matroska_cluster, &cluster);
1758     if (res < 0)  matroska->done = 1;
1759     return res;
1760 }
1761
1762 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1763 {
1764     MatroskaDemuxContext *matroska = s->priv_data;
1765
1766     while (matroska_deliver_packet(matroska, pkt)) {
1767         if (matroska->done)
1768             return AVERROR_EOF;
1769         matroska_parse_cluster(matroska);
1770     }
1771
1772     return 0;
1773 }
1774
1775 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1776                               int64_t timestamp, int flags)
1777 {
1778     MatroskaDemuxContext *matroska = s->priv_data;
1779     MatroskaTrack *tracks = matroska->tracks.elem;
1780     AVStream *st = s->streams[stream_index];
1781     int i, index, index_sub, index_min;
1782
1783     if (!st->nb_index_entries)
1784         return 0;
1785     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1786
1787     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1788         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1789         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1790             matroska_clear_queue(matroska);
1791             if (matroska_parse_cluster(matroska) < 0)
1792                 break;
1793         }
1794     }
1795
1796     matroska_clear_queue(matroska);
1797     if (index < 0)
1798         return 0;
1799
1800     index_min = index;
1801     for (i=0; i < matroska->tracks.nb_elem; i++) {
1802         tracks[i].end_timecode = 0;
1803         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1804             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1805             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1806             if (index_sub >= 0
1807                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1808                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1809                 index_min = index_sub;
1810         }
1811     }
1812
1813     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1814     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1815     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1816     matroska->done = 0;
1817     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1818     return 0;
1819 }
1820
1821 static int matroska_read_close(AVFormatContext *s)
1822 {
1823     MatroskaDemuxContext *matroska = s->priv_data;
1824     MatroskaTrack *tracks = matroska->tracks.elem;
1825     int n;
1826
1827     matroska_clear_queue(matroska);
1828
1829     for (n=0; n < matroska->tracks.nb_elem; n++)
1830         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1831             av_free(tracks[n].audio.buf);
1832     ebml_free(matroska_segment, matroska);
1833
1834     return 0;
1835 }
1836
1837 AVInputFormat matroska_demuxer = {
1838     "matroska",
1839     NULL_IF_CONFIG_SMALL("Matroska file format"),
1840     sizeof(MatroskaDemuxContext),
1841     matroska_probe,
1842     matroska_read_header,
1843     matroska_read_packet,
1844     matroska_read_close,
1845     matroska_read_seek,
1846     .metadata_conv = ff_mkv_metadata_conv,
1847 };