matroskadec: fix stupid typo (!= -> ==)
[ffmpeg.git] / libavformat / matroskadec.c
1 /*
2  * Matroska file demuxer
3  * Copyright (c) 2003-2008 The Libav Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file
24  * Matroska file demuxer
25  * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26  * with a little help from Moritz Bunkus <moritz@bunkus.org>
27  * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28  * Specs available on the Matroska project page: http://www.matroska.org/.
29  */
30
31 #include <stdio.h>
32 #include "avformat.h"
33 #include "internal.h"
34 #include "avio_internal.h"
35 /* For ff_codec_get_id(). */
36 #include "riff.h"
37 #include "isom.h"
38 #include "rm.h"
39 #include "matroska.h"
40 #include "libavcodec/mpeg4audio.h"
41 #include "libavutil/intfloat_readwrite.h"
42 #include "libavutil/intreadwrite.h"
43 #include "libavutil/avstring.h"
44 #include "libavutil/lzo.h"
45 #include "libavutil/dict.h"
46 #if CONFIG_ZLIB
47 #include <zlib.h>
48 #endif
49 #if CONFIG_BZLIB
50 #include <bzlib.h>
51 #endif
52
53 typedef enum {
54     EBML_NONE,
55     EBML_UINT,
56     EBML_FLOAT,
57     EBML_STR,
58     EBML_UTF8,
59     EBML_BIN,
60     EBML_NEST,
61     EBML_PASS,
62     EBML_STOP,
63     EBML_TYPE_COUNT
64 } EbmlType;
65
66 typedef const struct EbmlSyntax {
67     uint32_t id;
68     EbmlType type;
69     int list_elem_size;
70     int data_offset;
71     union {
72         uint64_t    u;
73         double      f;
74         const char *s;
75         const struct EbmlSyntax *n;
76     } def;
77 } EbmlSyntax;
78
79 typedef struct {
80     int nb_elem;
81     void *elem;
82 } EbmlList;
83
84 typedef struct {
85     int      size;
86     uint8_t *data;
87     int64_t  pos;
88 } EbmlBin;
89
90 typedef struct {
91     uint64_t version;
92     uint64_t max_size;
93     uint64_t id_length;
94     char    *doctype;
95     uint64_t doctype_version;
96 } Ebml;
97
98 typedef struct {
99     uint64_t algo;
100     EbmlBin  settings;
101 } MatroskaTrackCompression;
102
103 typedef struct {
104     uint64_t scope;
105     uint64_t type;
106     MatroskaTrackCompression compression;
107 } MatroskaTrackEncoding;
108
109 typedef struct {
110     double   frame_rate;
111     uint64_t display_width;
112     uint64_t display_height;
113     uint64_t pixel_width;
114     uint64_t pixel_height;
115     uint64_t fourcc;
116 } MatroskaTrackVideo;
117
118 typedef struct {
119     double   samplerate;
120     double   out_samplerate;
121     uint64_t bitdepth;
122     uint64_t channels;
123
124     /* real audio header (extracted from extradata) */
125     int      coded_framesize;
126     int      sub_packet_h;
127     int      frame_size;
128     int      sub_packet_size;
129     int      sub_packet_cnt;
130     int      pkt_cnt;
131     uint64_t buf_timecode;
132     uint8_t *buf;
133 } MatroskaTrackAudio;
134
135 typedef struct {
136     uint64_t num;
137     uint64_t uid;
138     uint64_t type;
139     char    *name;
140     char    *codec_id;
141     EbmlBin  codec_priv;
142     char    *language;
143     double time_scale;
144     uint64_t default_duration;
145     uint64_t flag_default;
146     uint64_t flag_forced;
147     MatroskaTrackVideo video;
148     MatroskaTrackAudio audio;
149     EbmlList encodings;
150
151     AVStream *stream;
152     int64_t end_timecode;
153     int ms_compat;
154 } MatroskaTrack;
155
156 typedef struct {
157     uint64_t uid;
158     char *filename;
159     char *mime;
160     EbmlBin bin;
161
162     AVStream *stream;
163 } MatroskaAttachement;
164
165 typedef struct {
166     uint64_t start;
167     uint64_t end;
168     uint64_t uid;
169     char    *title;
170
171     AVChapter *chapter;
172 } MatroskaChapter;
173
174 typedef struct {
175     uint64_t track;
176     uint64_t pos;
177 } MatroskaIndexPos;
178
179 typedef struct {
180     uint64_t time;
181     EbmlList pos;
182 } MatroskaIndex;
183
184 typedef struct {
185     char *name;
186     char *string;
187     char *lang;
188     uint64_t def;
189     EbmlList sub;
190 } MatroskaTag;
191
192 typedef struct {
193     char    *type;
194     uint64_t typevalue;
195     uint64_t trackuid;
196     uint64_t chapteruid;
197     uint64_t attachuid;
198 } MatroskaTagTarget;
199
200 typedef struct {
201     MatroskaTagTarget target;
202     EbmlList tag;
203 } MatroskaTags;
204
205 typedef struct {
206     uint64_t id;
207     uint64_t pos;
208 } MatroskaSeekhead;
209
210 typedef struct {
211     uint64_t start;
212     uint64_t length;
213 } MatroskaLevel;
214
215 typedef struct {
216     AVFormatContext *ctx;
217
218     /* EBML stuff */
219     int num_levels;
220     MatroskaLevel levels[EBML_MAX_DEPTH];
221     int level_up;
222     uint32_t current_id;
223
224     uint64_t time_scale;
225     double   duration;
226     char    *title;
227     EbmlList tracks;
228     EbmlList attachments;
229     EbmlList chapters;
230     EbmlList index;
231     EbmlList tags;
232     EbmlList seekhead;
233
234     /* byte position of the segment inside the stream */
235     int64_t segment_start;
236
237     /* the packet queue */
238     AVPacket **packets;
239     int num_packets;
240     AVPacket *prev_pkt;
241
242     int done;
243
244     /* What to skip before effectively reading a packet. */
245     int skip_to_keyframe;
246     uint64_t skip_to_timecode;
247
248     /* File has a CUES element, but we defer parsing until it is needed. */
249     int cues_parsing_deferred;
250 } MatroskaDemuxContext;
251
252 typedef struct {
253     uint64_t duration;
254     int64_t  reference;
255     uint64_t non_simple;
256     EbmlBin  bin;
257 } MatroskaBlock;
258
259 typedef struct {
260     uint64_t timecode;
261     EbmlList blocks;
262 } MatroskaCluster;
263
264 static EbmlSyntax ebml_header[] = {
265     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
266     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
267     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
268     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
269     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
270     { EBML_ID_EBMLVERSION,            EBML_NONE },
271     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
272     { 0 }
273 };
274
275 static EbmlSyntax ebml_syntax[] = {
276     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
277     { 0 }
278 };
279
280 static EbmlSyntax matroska_info[] = {
281     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
282     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
283     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
284     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
285     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
286     { MATROSKA_ID_DATEUTC,            EBML_NONE },
287     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
288     { 0 }
289 };
290
291 static EbmlSyntax matroska_track_video[] = {
292     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
293     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
294     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
295     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
296     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
297     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
298     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
299     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
300     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
301     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
302     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
303     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
304     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
305     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
306     { 0 }
307 };
308
309 static EbmlSyntax matroska_track_audio[] = {
310     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
311     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
312     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
313     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
314     { 0 }
315 };
316
317 static EbmlSyntax matroska_track_encoding_compression[] = {
318     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
319     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
320     { 0 }
321 };
322
323 static EbmlSyntax matroska_track_encoding[] = {
324     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
325     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
326     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
327     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
328     { 0 }
329 };
330
331 static EbmlSyntax matroska_track_encodings[] = {
332     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
333     { 0 }
334 };
335
336 static EbmlSyntax matroska_track[] = {
337     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
338     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
339     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
340     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
341     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
342     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
343     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
344     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
345     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
346     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
347     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
348     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
349     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
350     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
351     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
352     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
353     { MATROSKA_ID_CODECNAME,            EBML_NONE },
354     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
355     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
356     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
357     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
358     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
359     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
360     { 0 }
361 };
362
363 static EbmlSyntax matroska_tracks[] = {
364     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
365     { 0 }
366 };
367
368 static EbmlSyntax matroska_attachment[] = {
369     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
370     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
371     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
372     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
373     { MATROSKA_ID_FILEDESC,           EBML_NONE },
374     { 0 }
375 };
376
377 static EbmlSyntax matroska_attachments[] = {
378     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
379     { 0 }
380 };
381
382 static EbmlSyntax matroska_chapter_display[] = {
383     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
384     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
385     { 0 }
386 };
387
388 static EbmlSyntax matroska_chapter_entry[] = {
389     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
390     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
391     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
392     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
393     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
394     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
395     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
396     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
397     { 0 }
398 };
399
400 static EbmlSyntax matroska_chapter[] = {
401     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
402     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
403     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
404     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
405     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
406     { 0 }
407 };
408
409 static EbmlSyntax matroska_chapters[] = {
410     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
411     { 0 }
412 };
413
414 static EbmlSyntax matroska_index_pos[] = {
415     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
416     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
417     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
418     { 0 }
419 };
420
421 static EbmlSyntax matroska_index_entry[] = {
422     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
423     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
424     { 0 }
425 };
426
427 static EbmlSyntax matroska_index[] = {
428     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
429     { 0 }
430 };
431
432 static EbmlSyntax matroska_simpletag[] = {
433     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
434     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
435     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
436     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
437     { MATROSKA_ID_TAGDEFAULT_BUG,     EBML_UINT, 0, offsetof(MatroskaTag,def) },
438     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
439     { 0 }
440 };
441
442 static EbmlSyntax matroska_tagtargets[] = {
443     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
444     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
445     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
446     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
447     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
448     { 0 }
449 };
450
451 static EbmlSyntax matroska_tag[] = {
452     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
453     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
454     { 0 }
455 };
456
457 static EbmlSyntax matroska_tags[] = {
458     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
459     { 0 }
460 };
461
462 static EbmlSyntax matroska_seekhead_entry[] = {
463     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
464     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
465     { 0 }
466 };
467
468 static EbmlSyntax matroska_seekhead[] = {
469     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
470     { 0 }
471 };
472
473 static EbmlSyntax matroska_segment[] = {
474     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
475     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
476     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
477     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
478     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
479     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
480     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
481     { MATROSKA_ID_CLUSTER,        EBML_STOP },
482     { 0 }
483 };
484
485 static EbmlSyntax matroska_segments[] = {
486     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
487     { 0 }
488 };
489
490 static EbmlSyntax matroska_blockgroup[] = {
491     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
492     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
493     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
494     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
495     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
496     { 0 }
497 };
498
499 static EbmlSyntax matroska_cluster[] = {
500     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
501     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
502     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
503     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
504     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
505     { 0 }
506 };
507
508 static EbmlSyntax matroska_clusters[] = {
509     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
510     { MATROSKA_ID_INFO,           EBML_NONE },
511     { MATROSKA_ID_CUES,           EBML_NONE },
512     { MATROSKA_ID_TAGS,           EBML_NONE },
513     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
514     { 0 }
515 };
516
517 static const char *matroska_doctypes[] = { "matroska", "webm" };
518
519 /*
520  * Return: Whether we reached the end of a level in the hierarchy or not.
521  */
522 static int ebml_level_end(MatroskaDemuxContext *matroska)
523 {
524     AVIOContext *pb = matroska->ctx->pb;
525     int64_t pos = avio_tell(pb);
526
527     if (matroska->num_levels > 0) {
528         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
529         if (pos - level->start >= level->length || matroska->current_id) {
530             matroska->num_levels--;
531             return 1;
532         }
533     }
534     return 0;
535 }
536
537 /*
538  * Read: an "EBML number", which is defined as a variable-length
539  * array of bytes. The first byte indicates the length by giving a
540  * number of 0-bits followed by a one. The position of the first
541  * "one" bit inside the first byte indicates the length of this
542  * number.
543  * Returns: number of bytes read, < 0 on error
544  */
545 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
546                          int max_size, uint64_t *number)
547 {
548     int read = 1, n = 1;
549     uint64_t total = 0;
550
551     /* The first byte tells us the length in bytes - avio_r8() can normally
552      * return 0, but since that's not a valid first ebmlID byte, we can
553      * use it safely here to catch EOS. */
554     if (!(total = avio_r8(pb))) {
555         /* we might encounter EOS here */
556         if (!pb->eof_reached) {
557             int64_t pos = avio_tell(pb);
558             av_log(matroska->ctx, AV_LOG_ERROR,
559                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
560                    pos, pos);
561         }
562         return AVERROR(EIO); /* EOS or actual I/O error */
563     }
564
565     /* get the length of the EBML number */
566     read = 8 - ff_log2_tab[total];
567     if (read > max_size) {
568         int64_t pos = avio_tell(pb) - 1;
569         av_log(matroska->ctx, AV_LOG_ERROR,
570                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
571                (uint8_t) total, pos, pos);
572         return AVERROR_INVALIDDATA;
573     }
574
575     /* read out length */
576     total ^= 1 << ff_log2_tab[total];
577     while (n++ < read)
578         total = (total << 8) | avio_r8(pb);
579
580     *number = total;
581
582     return read;
583 }
584
585 /**
586  * Read a EBML length value.
587  * This needs special handling for the "unknown length" case which has multiple
588  * encodings.
589  */
590 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
591                             uint64_t *number)
592 {
593     int res = ebml_read_num(matroska, pb, 8, number);
594     if (res > 0 && *number + 1 == 1ULL << (7 * res))
595         *number = 0xffffffffffffffULL;
596     return res;
597 }
598
599 /*
600  * Read the next element as an unsigned int.
601  * 0 is success, < 0 is failure.
602  */
603 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
604 {
605     int n = 0;
606
607     if (size > 8)
608         return AVERROR_INVALIDDATA;
609
610     /* big-endian ordering; build up number */
611     *num = 0;
612     while (n++ < size)
613         *num = (*num << 8) | avio_r8(pb);
614
615     return 0;
616 }
617
618 /*
619  * Read the next element as a float.
620  * 0 is success, < 0 is failure.
621  */
622 static int ebml_read_float(AVIOContext *pb, int size, double *num)
623 {
624     if (size == 0) {
625         *num = 0;
626     } else if (size == 4) {
627         *num= av_int2flt(avio_rb32(pb));
628     } else if(size==8){
629         *num= av_int2dbl(avio_rb64(pb));
630     } else
631         return AVERROR_INVALIDDATA;
632
633     return 0;
634 }
635
636 /*
637  * Read the next element as an ASCII string.
638  * 0 is success, < 0 is failure.
639  */
640 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
641 {
642     av_free(*str);
643     /* EBML strings are usually not 0-terminated, so we allocate one
644      * byte more, read the string and NULL-terminate it ourselves. */
645     if (!(*str = av_malloc(size + 1)))
646         return AVERROR(ENOMEM);
647     if (avio_read(pb, (uint8_t *) *str, size) != size) {
648         av_freep(str);
649         return AVERROR(EIO);
650     }
651     (*str)[size] = '\0';
652
653     return 0;
654 }
655
656 /*
657  * Read the next element as binary data.
658  * 0 is success, < 0 is failure.
659  */
660 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
661 {
662     av_free(bin->data);
663     if (!(bin->data = av_malloc(length)))
664         return AVERROR(ENOMEM);
665
666     bin->size = length;
667     bin->pos  = avio_tell(pb);
668     if (avio_read(pb, bin->data, length) != length) {
669         av_freep(&bin->data);
670         return AVERROR(EIO);
671     }
672
673     return 0;
674 }
675
676 /*
677  * Read the next element, but only the header. The contents
678  * are supposed to be sub-elements which can be read separately.
679  * 0 is success, < 0 is failure.
680  */
681 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
682 {
683     AVIOContext *pb = matroska->ctx->pb;
684     MatroskaLevel *level;
685
686     if (matroska->num_levels >= EBML_MAX_DEPTH) {
687         av_log(matroska->ctx, AV_LOG_ERROR,
688                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
689         return AVERROR(ENOSYS);
690     }
691
692     level = &matroska->levels[matroska->num_levels++];
693     level->start = avio_tell(pb);
694     level->length = length;
695
696     return 0;
697 }
698
699 /*
700  * Read signed/unsigned "EBML" numbers.
701  * Return: number of bytes processed, < 0 on error
702  */
703 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
704                                  uint8_t *data, uint32_t size, uint64_t *num)
705 {
706     AVIOContext pb;
707     ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
708     return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
709 }
710
711 /*
712  * Same as above, but signed.
713  */
714 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
715                                  uint8_t *data, uint32_t size, int64_t *num)
716 {
717     uint64_t unum;
718     int res;
719
720     /* read as unsigned number first */
721     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
722         return res;
723
724     /* make signed (weird way) */
725     *num = unum - ((1LL << (7*res - 1)) - 1);
726
727     return res;
728 }
729
730 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
731                            EbmlSyntax *syntax, void *data);
732
733 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
734                          uint32_t id, void *data)
735 {
736     int i;
737     for (i=0; syntax[i].id; i++)
738         if (id == syntax[i].id)
739             break;
740     if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
741         matroska->num_levels > 0 &&
742         matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
743         return 0;  // we reached the end of an unknown size cluster
744     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
745         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
746     return ebml_parse_elem(matroska, &syntax[i], data);
747 }
748
749 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
750                       void *data)
751 {
752     if (!matroska->current_id) {
753         uint64_t id;
754         int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
755         if (res < 0)
756             return res;
757         matroska->current_id = id | 1 << 7*res;
758     }
759     return ebml_parse_id(matroska, syntax, matroska->current_id, data);
760 }
761
762 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
763                            void *data)
764 {
765     int i, res = 0;
766
767     for (i=0; syntax[i].id; i++)
768         switch (syntax[i].type) {
769         case EBML_UINT:
770             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
771             break;
772         case EBML_FLOAT:
773             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
774             break;
775         case EBML_STR:
776         case EBML_UTF8:
777             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
778             break;
779         }
780
781     while (!res && !ebml_level_end(matroska))
782         res = ebml_parse(matroska, syntax, data);
783
784     return res;
785 }
786
787 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
788                            EbmlSyntax *syntax, void *data)
789 {
790     static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
791         [EBML_UINT]  = 8,
792         [EBML_FLOAT] = 8,
793         // max. 16 MB for strings
794         [EBML_STR]   = 0x1000000,
795         [EBML_UTF8]  = 0x1000000,
796         // max. 256 MB for binary data
797         [EBML_BIN]   = 0x10000000,
798         // no limits for anything else
799     };
800     AVIOContext *pb = matroska->ctx->pb;
801     uint32_t id = syntax->id;
802     uint64_t length;
803     int res;
804
805     data = (char *)data + syntax->data_offset;
806     if (syntax->list_elem_size) {
807         EbmlList *list = data;
808         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
809         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
810         memset(data, 0, syntax->list_elem_size);
811         list->nb_elem++;
812     }
813
814     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
815         matroska->current_id = 0;
816         if ((res = ebml_read_length(matroska, pb, &length)) < 0)
817             return res;
818         if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
819             av_log(matroska->ctx, AV_LOG_ERROR,
820                    "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
821                    length, max_lengths[syntax->type], syntax->type);
822             return AVERROR_INVALIDDATA;
823         }
824     }
825
826     switch (syntax->type) {
827     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
828     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
829     case EBML_STR:
830     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
831     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
832     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
833                          return res;
834                      if (id == MATROSKA_ID_SEGMENT)
835                          matroska->segment_start = avio_tell(matroska->ctx->pb);
836                      return ebml_parse_nest(matroska, syntax->def.n, data);
837     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
838     case EBML_STOP:  return 1;
839     default:         return avio_skip(pb,length)<0 ? AVERROR(EIO) : 0;
840     }
841     if (res == AVERROR_INVALIDDATA)
842         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
843     else if (res == AVERROR(EIO))
844         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
845     return res;
846 }
847
848 static void ebml_free(EbmlSyntax *syntax, void *data)
849 {
850     int i, j;
851     for (i=0; syntax[i].id; i++) {
852         void *data_off = (char *)data + syntax[i].data_offset;
853         switch (syntax[i].type) {
854         case EBML_STR:
855         case EBML_UTF8:  av_freep(data_off);                      break;
856         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
857         case EBML_NEST:
858             if (syntax[i].list_elem_size) {
859                 EbmlList *list = data_off;
860                 char *ptr = list->elem;
861                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
862                     ebml_free(syntax[i].def.n, ptr);
863                 av_free(list->elem);
864             } else
865                 ebml_free(syntax[i].def.n, data_off);
866         default:  break;
867         }
868     }
869 }
870
871
872 /*
873  * Autodetecting...
874  */
875 static int matroska_probe(AVProbeData *p)
876 {
877     uint64_t total = 0;
878     int len_mask = 0x80, size = 1, n = 1, i;
879
880     /* EBML header? */
881     if (AV_RB32(p->buf) != EBML_ID_HEADER)
882         return 0;
883
884     /* length of header */
885     total = p->buf[4];
886     while (size <= 8 && !(total & len_mask)) {
887         size++;
888         len_mask >>= 1;
889     }
890     if (size > 8)
891       return 0;
892     total &= (len_mask - 1);
893     while (n < size)
894         total = (total << 8) | p->buf[4 + n++];
895
896     /* Does the probe data contain the whole header? */
897     if (p->buf_size < 4 + size + total)
898       return 0;
899
900     /* The header should contain a known document type. For now,
901      * we don't parse the whole header but simply check for the
902      * availability of that array of characters inside the header.
903      * Not fully fool-proof, but good enough. */
904     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
905         int probelen = strlen(matroska_doctypes[i]);
906         for (n = 4+size; n <= 4+size+total-probelen; n++)
907             if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
908                 return AVPROBE_SCORE_MAX;
909     }
910
911     // probably valid EBML header but no recognized doctype
912     return AVPROBE_SCORE_MAX/2;
913 }
914
915 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
916                                                  int num)
917 {
918     MatroskaTrack *tracks = matroska->tracks.elem;
919     int i;
920
921     for (i=0; i < matroska->tracks.nb_elem; i++)
922         if (tracks[i].num == num)
923             return &tracks[i];
924
925     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
926     return NULL;
927 }
928
929 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
930                                   MatroskaTrack *track)
931 {
932     MatroskaTrackEncoding *encodings = track->encodings.elem;
933     uint8_t* data = *buf;
934     int isize = *buf_size;
935     uint8_t* pkt_data = NULL;
936     int pkt_size = isize;
937     int result = 0;
938     int olen;
939
940     if (pkt_size >= 10000000)
941         return -1;
942
943     switch (encodings[0].compression.algo) {
944     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
945         return encodings[0].compression.settings.size;
946     case MATROSKA_TRACK_ENCODING_COMP_LZO:
947         do {
948             olen = pkt_size *= 3;
949             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
950             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
951         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
952         if (result)
953             goto failed;
954         pkt_size -= olen;
955         break;
956 #if CONFIG_ZLIB
957     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
958         z_stream zstream = {0};
959         if (inflateInit(&zstream) != Z_OK)
960             return -1;
961         zstream.next_in = data;
962         zstream.avail_in = isize;
963         do {
964             pkt_size *= 3;
965             pkt_data = av_realloc(pkt_data, pkt_size);
966             zstream.avail_out = pkt_size - zstream.total_out;
967             zstream.next_out = pkt_data + zstream.total_out;
968             result = inflate(&zstream, Z_NO_FLUSH);
969         } while (result==Z_OK && pkt_size<10000000);
970         pkt_size = zstream.total_out;
971         inflateEnd(&zstream);
972         if (result != Z_STREAM_END)
973             goto failed;
974         break;
975     }
976 #endif
977 #if CONFIG_BZLIB
978     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
979         bz_stream bzstream = {0};
980         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
981             return -1;
982         bzstream.next_in = data;
983         bzstream.avail_in = isize;
984         do {
985             pkt_size *= 3;
986             pkt_data = av_realloc(pkt_data, pkt_size);
987             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
988             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
989             result = BZ2_bzDecompress(&bzstream);
990         } while (result==BZ_OK && pkt_size<10000000);
991         pkt_size = bzstream.total_out_lo32;
992         BZ2_bzDecompressEnd(&bzstream);
993         if (result != BZ_STREAM_END)
994             goto failed;
995         break;
996     }
997 #endif
998     default:
999         return -1;
1000     }
1001
1002     *buf = pkt_data;
1003     *buf_size = pkt_size;
1004     return 0;
1005  failed:
1006     av_free(pkt_data);
1007     return -1;
1008 }
1009
1010 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1011                                     AVPacket *pkt, uint64_t display_duration)
1012 {
1013     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
1014     for (; *ptr!=',' && ptr<end-1; ptr++);
1015     if (*ptr == ',')
1016         layer = ++ptr;
1017     for (; *ptr!=',' && ptr<end-1; ptr++);
1018     if (*ptr == ',') {
1019         int64_t end_pts = pkt->pts + display_duration;
1020         int sc = matroska->time_scale * pkt->pts / 10000000;
1021         int ec = matroska->time_scale * end_pts  / 10000000;
1022         int sh, sm, ss, eh, em, es, len;
1023         sh = sc/360000;  sc -= 360000*sh;
1024         sm = sc/  6000;  sc -=   6000*sm;
1025         ss = sc/   100;  sc -=    100*ss;
1026         eh = ec/360000;  ec -= 360000*eh;
1027         em = ec/  6000;  ec -=   6000*em;
1028         es = ec/   100;  ec -=    100*es;
1029         *ptr++ = '\0';
1030         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1031         if (!(line = av_malloc(len)))
1032             return;
1033         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1034                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1035         av_free(pkt->data);
1036         pkt->data = line;
1037         pkt->size = strlen(line);
1038     }
1039 }
1040
1041 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
1042 {
1043     out->data = av_realloc(out->data, out->size+in->size);
1044     memcpy(out->data+out->size, in->data, in->size);
1045     out->size += in->size;
1046     av_destruct_packet(in);
1047     av_free(in);
1048 }
1049
1050 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1051                                  AVDictionary **metadata, char *prefix)
1052 {
1053     MatroskaTag *tags = list->elem;
1054     char key[1024];
1055     int i;
1056
1057     for (i=0; i < list->nb_elem; i++) {
1058         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1059
1060         if (!tags[i].name) {
1061             av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1062             continue;
1063         }
1064         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1065         else         av_strlcpy(key, tags[i].name, sizeof(key));
1066         if (tags[i].def || !lang) {
1067         av_dict_set(metadata, key, tags[i].string, 0);
1068         if (tags[i].sub.nb_elem)
1069             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1070         }
1071         if (lang) {
1072             av_strlcat(key, "-", sizeof(key));
1073             av_strlcat(key, lang, sizeof(key));
1074             av_dict_set(metadata, key, tags[i].string, 0);
1075             if (tags[i].sub.nb_elem)
1076                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1077         }
1078     }
1079     ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1080 }
1081
1082 static void matroska_convert_tags(AVFormatContext *s)
1083 {
1084     MatroskaDemuxContext *matroska = s->priv_data;
1085     MatroskaTags *tags = matroska->tags.elem;
1086     int i, j;
1087
1088     for (i=0; i < matroska->tags.nb_elem; i++) {
1089         if (tags[i].target.attachuid) {
1090             MatroskaAttachement *attachment = matroska->attachments.elem;
1091             for (j=0; j<matroska->attachments.nb_elem; j++)
1092                 if (attachment[j].uid == tags[i].target.attachuid
1093                     && attachment[j].stream)
1094                     matroska_convert_tag(s, &tags[i].tag,
1095                                          &attachment[j].stream->metadata, NULL);
1096         } else if (tags[i].target.chapteruid) {
1097             MatroskaChapter *chapter = matroska->chapters.elem;
1098             for (j=0; j<matroska->chapters.nb_elem; j++)
1099                 if (chapter[j].uid == tags[i].target.chapteruid
1100                     && chapter[j].chapter)
1101                     matroska_convert_tag(s, &tags[i].tag,
1102                                          &chapter[j].chapter->metadata, NULL);
1103         } else if (tags[i].target.trackuid) {
1104             MatroskaTrack *track = matroska->tracks.elem;
1105             for (j=0; j<matroska->tracks.nb_elem; j++)
1106                 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1107                     matroska_convert_tag(s, &tags[i].tag,
1108                                          &track[j].stream->metadata, NULL);
1109         } else {
1110             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1111                                  tags[i].target.type);
1112         }
1113     }
1114 }
1115
1116 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx)
1117 {
1118     EbmlList *seekhead_list = &matroska->seekhead;
1119     MatroskaSeekhead *seekhead = seekhead_list->elem;
1120     uint32_t level_up = matroska->level_up;
1121     int64_t before_pos = avio_tell(matroska->ctx->pb);
1122     uint32_t saved_id = matroska->current_id;
1123     MatroskaLevel level;
1124     int64_t offset;
1125     int ret = 0;
1126
1127     if (idx >= seekhead_list->nb_elem
1128             || seekhead[idx].id == MATROSKA_ID_SEEKHEAD
1129             || seekhead[idx].id == MATROSKA_ID_CLUSTER)
1130         return 0;
1131
1132     /* seek */
1133     offset = seekhead[idx].pos + matroska->segment_start;
1134     if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1135         /* We don't want to lose our seekhead level, so we add
1136          * a dummy. This is a crude hack. */
1137         if (matroska->num_levels == EBML_MAX_DEPTH) {
1138             av_log(matroska->ctx, AV_LOG_INFO,
1139                    "Max EBML element depth (%d) reached, "
1140                    "cannot parse further.\n", EBML_MAX_DEPTH);
1141             ret = AVERROR_INVALIDDATA;
1142         } else {
1143             level.start = 0;
1144             level.length = (uint64_t)-1;
1145             matroska->levels[matroska->num_levels] = level;
1146             matroska->num_levels++;
1147             matroska->current_id = 0;
1148
1149             ebml_parse(matroska, matroska_segment, matroska);
1150
1151             /* remove dummy level */
1152             while (matroska->num_levels) {
1153                 uint64_t length = matroska->levels[--matroska->num_levels].length;
1154                 if (length == (uint64_t)-1)
1155                     break;
1156             }
1157         }
1158     }
1159     /* seek back */
1160     avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1161     matroska->level_up = level_up;
1162     matroska->current_id = saved_id;
1163
1164     return ret;
1165 }
1166
1167 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1168 {
1169     EbmlList *seekhead_list = &matroska->seekhead;
1170     MatroskaSeekhead *seekhead = seekhead_list->elem;
1171     int64_t before_pos = avio_tell(matroska->ctx->pb);
1172     int i;
1173
1174     // we should not do any seeking in the streaming case
1175     if (!matroska->ctx->pb->seekable ||
1176         (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1177         return;
1178
1179     for (i = 0; i < seekhead_list->nb_elem; i++) {
1180         if (seekhead[i].pos <= before_pos)
1181             continue;
1182
1183         // defer cues parsing until we actually need cue data.
1184         if (seekhead[i].id == MATROSKA_ID_CUES) {
1185             matroska->cues_parsing_deferred = 1;
1186             continue;
1187         }
1188
1189         if (matroska_parse_seekhead_entry(matroska, i) < 0)
1190             break;
1191     }
1192 }
1193
1194 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1195     EbmlList *seekhead_list = &matroska->seekhead;
1196     MatroskaSeekhead *seekhead = seekhead_list->elem;
1197     EbmlList *index_list;
1198     MatroskaIndex *index;
1199     int index_scale = 1;
1200     int i, j;
1201
1202     for (i = 0; i < seekhead_list->nb_elem; i++)
1203         if (seekhead[i].id == MATROSKA_ID_CUES)
1204             break;
1205     assert(i <= seekhead_list->nb_elem);
1206
1207     matroska_parse_seekhead_entry(matroska, i);
1208
1209     index_list = &matroska->index;
1210     index = index_list->elem;
1211     if (index_list->nb_elem
1212         && index[0].time > 1E14/matroska->time_scale) {
1213         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1214         index_scale = matroska->time_scale;
1215     }
1216     for (i = 0; i < index_list->nb_elem; i++) {
1217         EbmlList *pos_list = &index[i].pos;
1218         MatroskaIndexPos *pos = pos_list->elem;
1219         for (j = 0; j < pos_list->nb_elem; j++) {
1220             MatroskaTrack *track = matroska_find_track_by_num(matroska, pos[j].track);
1221             if (track && track->stream)
1222                 av_add_index_entry(track->stream,
1223                                    pos[j].pos + matroska->segment_start,
1224                                    index[i].time/index_scale, 0, 0,
1225                                    AVINDEX_KEYFRAME);
1226         }
1227     }
1228 }
1229
1230 static int matroska_aac_profile(char *codec_id)
1231 {
1232     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1233     int profile;
1234
1235     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1236         if (strstr(codec_id, aac_profiles[profile]))
1237             break;
1238     return profile + 1;
1239 }
1240
1241 static int matroska_aac_sri(int samplerate)
1242 {
1243     int sri;
1244
1245     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1246         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1247             break;
1248     return sri;
1249 }
1250
1251 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1252 {
1253     MatroskaDemuxContext *matroska = s->priv_data;
1254     EbmlList *attachements_list = &matroska->attachments;
1255     MatroskaAttachement *attachements;
1256     EbmlList *chapters_list = &matroska->chapters;
1257     MatroskaChapter *chapters;
1258     MatroskaTrack *tracks;
1259     uint64_t max_start = 0;
1260     Ebml ebml = { 0 };
1261     AVStream *st;
1262     int i, j, res;
1263
1264     matroska->ctx = s;
1265
1266     /* First read the EBML header. */
1267     if (ebml_parse(matroska, ebml_syntax, &ebml)
1268         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1269         || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1270         av_log(matroska->ctx, AV_LOG_ERROR,
1271                "EBML header using unsupported features\n"
1272                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1273                ebml.version, ebml.doctype, ebml.doctype_version);
1274         ebml_free(ebml_syntax, &ebml);
1275         return AVERROR_PATCHWELCOME;
1276     }
1277     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1278         if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1279             break;
1280     if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1281         av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1282     }
1283     ebml_free(ebml_syntax, &ebml);
1284
1285     /* The next thing is a segment. */
1286     if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1287         return res;
1288     matroska_execute_seekhead(matroska);
1289
1290     if (!matroska->time_scale)
1291         matroska->time_scale = 1000000;
1292     if (matroska->duration)
1293         matroska->ctx->duration = matroska->duration * matroska->time_scale
1294                                   * 1000 / AV_TIME_BASE;
1295     av_dict_set(&s->metadata, "title", matroska->title, 0);
1296
1297     tracks = matroska->tracks.elem;
1298     for (i=0; i < matroska->tracks.nb_elem; i++) {
1299         MatroskaTrack *track = &tracks[i];
1300         enum CodecID codec_id = CODEC_ID_NONE;
1301         EbmlList *encodings_list = &tracks->encodings;
1302         MatroskaTrackEncoding *encodings = encodings_list->elem;
1303         uint8_t *extradata = NULL;
1304         int extradata_size = 0;
1305         int extradata_offset = 0;
1306         AVIOContext b;
1307
1308         /* Apply some sanity checks. */
1309         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1310             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1311             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1312             av_log(matroska->ctx, AV_LOG_INFO,
1313                    "Unknown or unsupported track type %"PRIu64"\n",
1314                    track->type);
1315             continue;
1316         }
1317         if (track->codec_id == NULL)
1318             continue;
1319
1320         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1321             if (!track->default_duration)
1322                 track->default_duration = 1000000000/track->video.frame_rate;
1323             if (!track->video.display_width)
1324                 track->video.display_width = track->video.pixel_width;
1325             if (!track->video.display_height)
1326                 track->video.display_height = track->video.pixel_height;
1327         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1328             if (!track->audio.out_samplerate)
1329                 track->audio.out_samplerate = track->audio.samplerate;
1330         }
1331         if (encodings_list->nb_elem > 1) {
1332             av_log(matroska->ctx, AV_LOG_ERROR,
1333                    "Multiple combined encodings no supported");
1334         } else if (encodings_list->nb_elem == 1) {
1335             if (encodings[0].type ||
1336                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1337 #if CONFIG_ZLIB
1338                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1339 #endif
1340 #if CONFIG_BZLIB
1341                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1342 #endif
1343                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1344                 encodings[0].scope = 0;
1345                 av_log(matroska->ctx, AV_LOG_ERROR,
1346                        "Unsupported encoding type");
1347             } else if (track->codec_priv.size && encodings[0].scope&2) {
1348                 uint8_t *codec_priv = track->codec_priv.data;
1349                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1350                                                     &track->codec_priv.size,
1351                                                     track);
1352                 if (offset < 0) {
1353                     track->codec_priv.data = NULL;
1354                     track->codec_priv.size = 0;
1355                     av_log(matroska->ctx, AV_LOG_ERROR,
1356                            "Failed to decode codec private data\n");
1357                 } else if (offset > 0) {
1358                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1359                     memcpy(track->codec_priv.data,
1360                            encodings[0].compression.settings.data, offset);
1361                     memcpy(track->codec_priv.data+offset, codec_priv,
1362                            track->codec_priv.size);
1363                     track->codec_priv.size += offset;
1364                 }
1365                 if (codec_priv != track->codec_priv.data)
1366                     av_free(codec_priv);
1367             }
1368         }
1369
1370         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1371             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1372                         strlen(ff_mkv_codec_tags[j].str))){
1373                 codec_id= ff_mkv_codec_tags[j].id;
1374                 break;
1375             }
1376         }
1377
1378         st = track->stream = av_new_stream(s, 0);
1379         if (st == NULL)
1380             return AVERROR(ENOMEM);
1381
1382         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1383             && track->codec_priv.size >= 40
1384             && track->codec_priv.data != NULL) {
1385             track->ms_compat = 1;
1386             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1387             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1388             extradata_offset = 40;
1389         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1390                    && track->codec_priv.size >= 14
1391                    && track->codec_priv.data != NULL) {
1392             int ret;
1393             ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
1394                           AVIO_FLAG_READ, NULL, NULL, NULL, NULL);
1395             ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1396             if (ret < 0)
1397                 return ret;
1398             codec_id = st->codec->codec_id;
1399             extradata_offset = FFMIN(track->codec_priv.size, 18);
1400         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1401                    && (track->codec_priv.size >= 86)
1402                    && (track->codec_priv.data != NULL)) {
1403             track->video.fourcc = AV_RL32(track->codec_priv.data);
1404             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1405         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1406             switch (track->audio.bitdepth) {
1407             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1408             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1409             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1410             }
1411         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1412             switch (track->audio.bitdepth) {
1413             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1414             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1415             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1416             }
1417         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1418             codec_id = CODEC_ID_PCM_F64LE;
1419         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1420             int profile = matroska_aac_profile(track->codec_id);
1421             int sri = matroska_aac_sri(track->audio.samplerate);
1422             extradata = av_malloc(5);
1423             if (extradata == NULL)
1424                 return AVERROR(ENOMEM);
1425             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1426             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1427             if (strstr(track->codec_id, "SBR")) {
1428                 sri = matroska_aac_sri(track->audio.out_samplerate);
1429                 extradata[2] = 0x56;
1430                 extradata[3] = 0xE5;
1431                 extradata[4] = 0x80 | (sri<<3);
1432                 extradata_size = 5;
1433             } else
1434                 extradata_size = 2;
1435         } else if (codec_id == CODEC_ID_TTA) {
1436             extradata_size = 30;
1437             extradata = av_mallocz(extradata_size);
1438             if (extradata == NULL)
1439                 return AVERROR(ENOMEM);
1440             ffio_init_context(&b, extradata, extradata_size, 1,
1441                           NULL, NULL, NULL, NULL);
1442             avio_write(&b, "TTA1", 4);
1443             avio_wl16(&b, 1);
1444             avio_wl16(&b, track->audio.channels);
1445             avio_wl16(&b, track->audio.bitdepth);
1446             avio_wl32(&b, track->audio.out_samplerate);
1447             avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1448         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1449                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1450             extradata_offset = 26;
1451         } else if (codec_id == CODEC_ID_RA_144) {
1452             track->audio.out_samplerate = 8000;
1453             track->audio.channels = 1;
1454         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1455                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1456             int flavor;
1457             ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
1458                           0, NULL, NULL, NULL, NULL);
1459             avio_skip(&b, 22);
1460             flavor                       = avio_rb16(&b);
1461             track->audio.coded_framesize = avio_rb32(&b);
1462             avio_skip(&b, 12);
1463             track->audio.sub_packet_h    = avio_rb16(&b);
1464             track->audio.frame_size      = avio_rb16(&b);
1465             track->audio.sub_packet_size = avio_rb16(&b);
1466             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1467             if (codec_id == CODEC_ID_RA_288) {
1468                 st->codec->block_align = track->audio.coded_framesize;
1469                 track->codec_priv.size = 0;
1470             } else {
1471                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1472                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1473                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1474                     st->codec->bit_rate = sipr_bit_rate[flavor];
1475                 }
1476                 st->codec->block_align = track->audio.sub_packet_size;
1477                 extradata_offset = 78;
1478             }
1479         }
1480         track->codec_priv.size -= extradata_offset;
1481
1482         if (codec_id == CODEC_ID_NONE)
1483             av_log(matroska->ctx, AV_LOG_INFO,
1484                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1485
1486         if (track->time_scale < 0.01)
1487             track->time_scale = 1.0;
1488         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1489
1490         st->codec->codec_id = codec_id;
1491         st->start_time = 0;
1492         if (strcmp(track->language, "und"))
1493             av_dict_set(&st->metadata, "language", track->language, 0);
1494         av_dict_set(&st->metadata, "title", track->name, 0);
1495
1496         if (track->flag_default)
1497             st->disposition |= AV_DISPOSITION_DEFAULT;
1498         if (track->flag_forced)
1499             st->disposition |= AV_DISPOSITION_FORCED;
1500
1501         if (track->default_duration)
1502             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1503                       track->default_duration, 1000000000, 30000);
1504
1505         if (!st->codec->extradata) {
1506             if(extradata){
1507                 st->codec->extradata = extradata;
1508                 st->codec->extradata_size = extradata_size;
1509             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1510                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1511                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1512                 if(st->codec->extradata == NULL)
1513                     return AVERROR(ENOMEM);
1514                 st->codec->extradata_size = track->codec_priv.size;
1515                 memcpy(st->codec->extradata,
1516                        track->codec_priv.data + extradata_offset,
1517                        track->codec_priv.size);
1518             }
1519         }
1520
1521         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1522             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1523             st->codec->codec_tag  = track->video.fourcc;
1524             st->codec->width  = track->video.pixel_width;
1525             st->codec->height = track->video.pixel_height;
1526             av_reduce(&st->sample_aspect_ratio.num,
1527                       &st->sample_aspect_ratio.den,
1528                       st->codec->height * track->video.display_width,
1529                       st->codec-> width * track->video.display_height,
1530                       255);
1531             if (st->codec->codec_id != CODEC_ID_H264)
1532             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1533             if (track->default_duration)
1534                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1535         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1536             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1537             st->codec->sample_rate = track->audio.out_samplerate;
1538             st->codec->channels = track->audio.channels;
1539             if (st->codec->codec_id != CODEC_ID_AAC)
1540             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1541         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1542             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1543         }
1544     }
1545
1546     attachements = attachements_list->elem;
1547     for (j=0; j<attachements_list->nb_elem; j++) {
1548         if (!(attachements[j].filename && attachements[j].mime &&
1549               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1550             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1551         } else {
1552             AVStream *st = av_new_stream(s, 0);
1553             if (st == NULL)
1554                 break;
1555             av_dict_set(&st->metadata, "filename",attachements[j].filename, 0);
1556             st->codec->codec_id = CODEC_ID_NONE;
1557             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1558             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1559             if(st->codec->extradata == NULL)
1560                 break;
1561             st->codec->extradata_size = attachements[j].bin.size;
1562             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1563
1564             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1565                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1566                              strlen(ff_mkv_mime_tags[i].str))) {
1567                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1568                     break;
1569                 }
1570             }
1571             attachements[j].stream = st;
1572         }
1573     }
1574
1575     chapters = chapters_list->elem;
1576     for (i=0; i<chapters_list->nb_elem; i++)
1577         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1578             && (max_start==0 || chapters[i].start > max_start)) {
1579             chapters[i].chapter =
1580             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1581                            chapters[i].start, chapters[i].end,
1582                            chapters[i].title);
1583             av_dict_set(&chapters[i].chapter->metadata,
1584                              "title", chapters[i].title, 0);
1585             max_start = chapters[i].start;
1586         }
1587
1588     matroska_convert_tags(s);
1589
1590     return 0;
1591 }
1592
1593 /*
1594  * Put one packet in an application-supplied AVPacket struct.
1595  * Returns 0 on success or -1 on failure.
1596  */
1597 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1598                                    AVPacket *pkt)
1599 {
1600     if (matroska->num_packets > 0) {
1601         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1602         av_free(matroska->packets[0]);
1603         if (matroska->num_packets > 1) {
1604             memmove(&matroska->packets[0], &matroska->packets[1],
1605                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1606             matroska->packets =
1607                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1608                            sizeof(AVPacket *));
1609         } else {
1610             av_freep(&matroska->packets);
1611         }
1612         matroska->num_packets--;
1613         return 0;
1614     }
1615
1616     return -1;
1617 }
1618
1619 /*
1620  * Free all packets in our internal queue.
1621  */
1622 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1623 {
1624     if (matroska->packets) {
1625         int n;
1626         for (n = 0; n < matroska->num_packets; n++) {
1627             av_free_packet(matroska->packets[n]);
1628             av_free(matroska->packets[n]);
1629         }
1630         av_freep(&matroska->packets);
1631         matroska->num_packets = 0;
1632     }
1633 }
1634
1635 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1636                                 int size, int64_t pos, uint64_t cluster_time,
1637                                 uint64_t duration, int is_keyframe,
1638                                 int64_t cluster_pos)
1639 {
1640     uint64_t timecode = AV_NOPTS_VALUE;
1641     MatroskaTrack *track;
1642     int res = 0;
1643     AVStream *st;
1644     AVPacket *pkt;
1645     int16_t block_time;
1646     uint32_t *lace_size = NULL;
1647     int n, flags, laces = 0;
1648     uint64_t num;
1649
1650     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1651         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1652         return res;
1653     }
1654     data += n;
1655     size -= n;
1656
1657     track = matroska_find_track_by_num(matroska, num);
1658     if (size <= 3 || !track || !track->stream) {
1659         av_log(matroska->ctx, AV_LOG_INFO,
1660                "Invalid stream %"PRIu64" or size %u\n", num, size);
1661         return AVERROR_INVALIDDATA;
1662     }
1663     st = track->stream;
1664     if (st->discard >= AVDISCARD_ALL)
1665         return res;
1666     if (duration == AV_NOPTS_VALUE)
1667         duration = track->default_duration / matroska->time_scale;
1668
1669     block_time = AV_RB16(data);
1670     data += 2;
1671     flags = *data++;
1672     size -= 3;
1673     if (is_keyframe == -1)
1674         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1675
1676     if (cluster_time != (uint64_t)-1
1677         && (block_time >= 0 || cluster_time >= -block_time)) {
1678         timecode = cluster_time + block_time;
1679         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1680             && timecode < track->end_timecode)
1681             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1682         if (is_keyframe)
1683             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1684         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1685     }
1686
1687     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1688         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1689             return res;
1690         matroska->skip_to_keyframe = 0;
1691     }
1692
1693     switch ((flags & 0x06) >> 1) {
1694         case 0x0: /* no lacing */
1695             laces = 1;
1696             lace_size = av_mallocz(sizeof(int));
1697             lace_size[0] = size;
1698             break;
1699
1700         case 0x1: /* Xiph lacing */
1701         case 0x2: /* fixed-size lacing */
1702         case 0x3: /* EBML lacing */
1703             assert(size>0); // size <=3 is checked before size-=3 above
1704             laces = (*data) + 1;
1705             data += 1;
1706             size -= 1;
1707             lace_size = av_mallocz(laces * sizeof(int));
1708
1709             switch ((flags & 0x06) >> 1) {
1710                 case 0x1: /* Xiph lacing */ {
1711                     uint8_t temp;
1712                     uint32_t total = 0;
1713                     for (n = 0; res == 0 && n < laces - 1; n++) {
1714                         while (1) {
1715                             if (size == 0) {
1716                                 res = -1;
1717                                 break;
1718                             }
1719                             temp = *data;
1720                             lace_size[n] += temp;
1721                             data += 1;
1722                             size -= 1;
1723                             if (temp != 0xff)
1724                                 break;
1725                         }
1726                         total += lace_size[n];
1727                     }
1728                     lace_size[n] = size - total;
1729                     break;
1730                 }
1731
1732                 case 0x2: /* fixed-size lacing */
1733                     for (n = 0; n < laces; n++)
1734                         lace_size[n] = size / laces;
1735                     break;
1736
1737                 case 0x3: /* EBML lacing */ {
1738                     uint32_t total;
1739                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1740                     if (n < 0) {
1741                         av_log(matroska->ctx, AV_LOG_INFO,
1742                                "EBML block data error\n");
1743                         break;
1744                     }
1745                     data += n;
1746                     size -= n;
1747                     total = lace_size[0] = num;
1748                     for (n = 1; res == 0 && n < laces - 1; n++) {
1749                         int64_t snum;
1750                         int r;
1751                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1752                         if (r < 0) {
1753                             av_log(matroska->ctx, AV_LOG_INFO,
1754                                    "EBML block data error\n");
1755                             break;
1756                         }
1757                         data += r;
1758                         size -= r;
1759                         lace_size[n] = lace_size[n - 1] + snum;
1760                         total += lace_size[n];
1761                     }
1762                     lace_size[n] = size - total;
1763                     break;
1764                 }
1765             }
1766             break;
1767     }
1768
1769     if (res == 0) {
1770         for (n = 0; n < laces; n++) {
1771             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1772                  st->codec->codec_id == CODEC_ID_COOK ||
1773                  st->codec->codec_id == CODEC_ID_SIPR ||
1774                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1775                  st->codec->block_align && track->audio.sub_packet_size) {
1776                 int a = st->codec->block_align;
1777                 int sps = track->audio.sub_packet_size;
1778                 int cfs = track->audio.coded_framesize;
1779                 int h = track->audio.sub_packet_h;
1780                 int y = track->audio.sub_packet_cnt;
1781                 int w = track->audio.frame_size;
1782                 int x;
1783
1784                 if (!track->audio.pkt_cnt) {
1785                     if (track->audio.sub_packet_cnt == 0)
1786                         track->audio.buf_timecode = timecode;
1787                     if (st->codec->codec_id == CODEC_ID_RA_288)
1788                         for (x=0; x<h/2; x++)
1789                             memcpy(track->audio.buf+x*2*w+y*cfs,
1790                                    data+x*cfs, cfs);
1791                     else if (st->codec->codec_id == CODEC_ID_SIPR)
1792                         memcpy(track->audio.buf + y*w, data, w);
1793                     else
1794                         for (x=0; x<w/sps; x++)
1795                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1796
1797                     if (++track->audio.sub_packet_cnt >= h) {
1798                         if (st->codec->codec_id == CODEC_ID_SIPR)
1799                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1800                         track->audio.sub_packet_cnt = 0;
1801                         track->audio.pkt_cnt = h*w / a;
1802                     }
1803                 }
1804                 while (track->audio.pkt_cnt) {
1805                     pkt = av_mallocz(sizeof(AVPacket));
1806                     av_new_packet(pkt, a);
1807                     memcpy(pkt->data, track->audio.buf
1808                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1809                     pkt->pts = track->audio.buf_timecode;
1810                     track->audio.buf_timecode = AV_NOPTS_VALUE;
1811                     pkt->pos = pos;
1812                     pkt->stream_index = st->index;
1813                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1814                 }
1815             } else {
1816                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1817                 int offset = 0, pkt_size = lace_size[n];
1818                 uint8_t *pkt_data = data;
1819
1820                 if (pkt_size > size) {
1821                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1822                     break;
1823                 }
1824
1825                 if (encodings && encodings->scope & 1) {
1826                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1827                     if (offset < 0)
1828                         continue;
1829                 }
1830
1831                 pkt = av_mallocz(sizeof(AVPacket));
1832                 /* XXX: prevent data copy... */
1833                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1834                     av_free(pkt);
1835                     res = AVERROR(ENOMEM);
1836                     break;
1837                 }
1838                 if (offset)
1839                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1840                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1841
1842                 if (pkt_data != data)
1843                     av_free(pkt_data);
1844
1845                 if (n == 0)
1846                     pkt->flags = is_keyframe;
1847                 pkt->stream_index = st->index;
1848
1849                 if (track->ms_compat)
1850                     pkt->dts = timecode;
1851                 else
1852                     pkt->pts = timecode;
1853                 pkt->pos = pos;
1854                 if (st->codec->codec_id == CODEC_ID_TEXT)
1855                     pkt->convergence_duration = duration;
1856                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1857                     pkt->duration = duration;
1858
1859                 if (st->codec->codec_id == CODEC_ID_SSA)
1860                     matroska_fix_ass_packet(matroska, pkt, duration);
1861
1862                 if (matroska->prev_pkt &&
1863                     timecode != AV_NOPTS_VALUE &&
1864                     matroska->prev_pkt->pts == timecode &&
1865                     matroska->prev_pkt->stream_index == st->index &&
1866                     st->codec->codec_id == CODEC_ID_SSA)
1867                     matroska_merge_packets(matroska->prev_pkt, pkt);
1868                 else {
1869                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1870                     matroska->prev_pkt = pkt;
1871                 }
1872             }
1873
1874             if (timecode != AV_NOPTS_VALUE)
1875                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1876             data += lace_size[n];
1877             size -= lace_size[n];
1878         }
1879     }
1880
1881     av_free(lace_size);
1882     return res;
1883 }
1884
1885 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1886 {
1887     MatroskaCluster cluster = { 0 };
1888     EbmlList *blocks_list;
1889     MatroskaBlock *blocks;
1890     int i, res;
1891     int64_t pos = avio_tell(matroska->ctx->pb);
1892     matroska->prev_pkt = NULL;
1893     if (matroska->current_id)
1894         pos -= 4;  /* sizeof the ID which was already read */
1895     res = ebml_parse(matroska, matroska_clusters, &cluster);
1896     blocks_list = &cluster.blocks;
1897     blocks = blocks_list->elem;
1898     for (i=0; i<blocks_list->nb_elem && !res; i++)
1899         if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1900             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1901             if (!blocks[i].non_simple)
1902                 blocks[i].duration = AV_NOPTS_VALUE;
1903             res=matroska_parse_block(matroska,
1904                                      blocks[i].bin.data, blocks[i].bin.size,
1905                                      blocks[i].bin.pos,  cluster.timecode,
1906                                      blocks[i].duration, is_keyframe,
1907                                      pos);
1908         }
1909     ebml_free(matroska_cluster, &cluster);
1910     if (res < 0)  matroska->done = 1;
1911     return res;
1912 }
1913
1914 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1915 {
1916     MatroskaDemuxContext *matroska = s->priv_data;
1917     int ret = 0;
1918
1919     while (!ret && matroska_deliver_packet(matroska, pkt)) {
1920         if (matroska->done)
1921             return AVERROR_EOF;
1922         ret = matroska_parse_cluster(matroska);
1923     }
1924
1925     return ret;
1926 }
1927
1928 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1929                               int64_t timestamp, int flags)
1930 {
1931     MatroskaDemuxContext *matroska = s->priv_data;
1932     MatroskaTrack *tracks = matroska->tracks.elem;
1933     AVStream *st = s->streams[stream_index];
1934     int i, index, index_sub, index_min;
1935
1936     /* Parse the CUES now since we need the index data to seek. */
1937     if (matroska->cues_parsing_deferred) {
1938         matroska_parse_cues(matroska);
1939         matroska->cues_parsing_deferred = 0;
1940     }
1941
1942     if (!st->nb_index_entries)
1943         return 0;
1944     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1945
1946     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1947         avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1948         matroska->current_id = 0;
1949         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1950             matroska_clear_queue(matroska);
1951             if (matroska_parse_cluster(matroska) < 0)
1952                 break;
1953         }
1954     }
1955
1956     matroska_clear_queue(matroska);
1957     if (index < 0)
1958         return 0;
1959
1960     index_min = index;
1961     for (i=0; i < matroska->tracks.nb_elem; i++) {
1962         tracks[i].audio.pkt_cnt = 0;
1963         tracks[i].audio.sub_packet_cnt = 0;
1964         tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
1965         tracks[i].end_timecode = 0;
1966         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1967             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1968             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1969             if (index_sub >= 0
1970                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1971                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1972                 index_min = index_sub;
1973         }
1974     }
1975
1976     avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1977     matroska->current_id = 0;
1978     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1979     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1980     matroska->done = 0;
1981     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1982     return 0;
1983 }
1984
1985 static int matroska_read_close(AVFormatContext *s)
1986 {
1987     MatroskaDemuxContext *matroska = s->priv_data;
1988     MatroskaTrack *tracks = matroska->tracks.elem;
1989     int n;
1990
1991     matroska_clear_queue(matroska);
1992
1993     for (n=0; n < matroska->tracks.nb_elem; n++)
1994         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1995             av_free(tracks[n].audio.buf);
1996     ebml_free(matroska_segment, matroska);
1997
1998     return 0;
1999 }
2000
2001 AVInputFormat ff_matroska_demuxer = {
2002     "matroska,webm",
2003     NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
2004     sizeof(MatroskaDemuxContext),
2005     matroska_probe,
2006     matroska_read_header,
2007     matroska_read_packet,
2008     matroska_read_close,
2009     matroska_read_seek,
2010 };