Statistics
| Branch: | Revision:

ffmpeg / libavformat / matroska.c @ 0d6d9632

History | View | Annotate | Download (88.6 KB)

1
/*
2
 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 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 matroska.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
 * Specs available on the matroska project page:
28
 * http://www.matroska.org/.
29
 */
30

    
31
#include "avformat.h"
32
/* For codec_get_bmp_id and codec_get_wav_id. */
33
#include "riff.h"
34
#include "intfloat_readwrite.h"
35

    
36
/* EBML version supported */
37
#define EBML_VERSION 1
38

    
39
/* top-level master-IDs */
40
#define EBML_ID_HEADER             0x1A45DFA3
41

    
42
/* IDs in the HEADER master */
43
#define EBML_ID_EBMLVERSION        0x4286
44
#define EBML_ID_EBMLREADVERSION    0x42F7
45
#define EBML_ID_EBMLMAXIDLENGTH    0x42F2
46
#define EBML_ID_EBMLMAXSIZELENGTH  0x42F3
47
#define EBML_ID_DOCTYPE            0x4282
48
#define EBML_ID_DOCTYPEVERSION     0x4287
49
#define EBML_ID_DOCTYPEREADVERSION 0x4285
50

    
51
/* general EBML types */
52
#define EBML_ID_VOID               0xEC
53

    
54
/*
55
 * Matroska element IDs. max. 32-bit.
56
 */
57

    
58
/* toplevel segment */
59
#define MATROSKA_ID_SEGMENT    0x18538067
60

    
61
/* matroska top-level master IDs */
62
#define MATROSKA_ID_INFO       0x1549A966
63
#define MATROSKA_ID_TRACKS     0x1654AE6B
64
#define MATROSKA_ID_CUES       0x1C53BB6B
65
#define MATROSKA_ID_TAGS       0x1254C367
66
#define MATROSKA_ID_SEEKHEAD   0x114D9B74
67
#define MATROSKA_ID_CLUSTER    0x1F43B675
68

    
69
/* IDs in the info master */
70
#define MATROSKA_ID_TIMECODESCALE 0x2AD7B1
71
#define MATROSKA_ID_DURATION   0x4489
72
#define MATROSKA_ID_TITLE      0x7BA9
73
#define MATROSKA_ID_WRITINGAPP 0x5741
74
#define MATROSKA_ID_MUXINGAPP  0x4D80
75
#define MATROSKA_ID_DATEUTC    0x4461
76

    
77
/* ID in the tracks master */
78
#define MATROSKA_ID_TRACKENTRY 0xAE
79

    
80
/* IDs in the trackentry master */
81
#define MATROSKA_ID_TRACKNUMBER 0xD7
82
#define MATROSKA_ID_TRACKUID   0x73C5
83
#define MATROSKA_ID_TRACKTYPE  0x83
84
#define MATROSKA_ID_TRACKAUDIO 0xE1
85
#define MATROSKA_ID_TRACKVIDEO 0xE0
86
#define MATROSKA_ID_CODECID    0x86
87
#define MATROSKA_ID_CODECPRIVATE 0x63A2
88
#define MATROSKA_ID_CODECNAME  0x258688
89
#define MATROSKA_ID_CODECINFOURL 0x3B4040
90
#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
91
#define MATROSKA_ID_TRACKNAME  0x536E
92
#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
93
#define MATROSKA_ID_TRACKFLAGENABLED 0xB9
94
#define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
95
#define MATROSKA_ID_TRACKFLAGLACING 0x9C
96
#define MATROSKA_ID_TRACKMINCACHE 0x6DE7
97
#define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
98
#define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383
99

    
100
/* IDs in the trackvideo master */
101
#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
102
#define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
103
#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
104
#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
105
#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
106
#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
107
#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
108
#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
109
#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
110

    
111
/* IDs in the trackaudio master */
112
#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
113
#define MATROSKA_ID_AUDIOOUTSAMPLINGFREQ 0x78B5
114

    
115
#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
116
#define MATROSKA_ID_AUDIOCHANNELS 0x9F
117

    
118
/* ID in the cues master */
119
#define MATROSKA_ID_POINTENTRY 0xBB
120

    
121
/* IDs in the pointentry master */
122
#define MATROSKA_ID_CUETIME    0xB3
123
#define MATROSKA_ID_CUETRACKPOSITION 0xB7
124

    
125
/* IDs in the cuetrackposition master */
126
#define MATROSKA_ID_CUETRACK   0xF7
127
#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
128

    
129
/* IDs in the tags master */
130
/* TODO */
131

    
132
/* IDs in the seekhead master */
133
#define MATROSKA_ID_SEEKENTRY  0x4DBB
134

    
135
/* IDs in the seekpoint master */
136
#define MATROSKA_ID_SEEKID     0x53AB
137
#define MATROSKA_ID_SEEKPOSITION 0x53AC
138

    
139
/* IDs in the cluster master */
140
#define MATROSKA_ID_CLUSTERTIMECODE 0xE7
141
#define MATROSKA_ID_BLOCKGROUP 0xA0
142

    
143
/* IDs in the blockgroup master */
144
#define MATROSKA_ID_BLOCK      0xA1
145
#define MATROSKA_ID_BLOCKDURATION 0x9B
146
#define MATROSKA_ID_BLOCKREFERENCE 0xFB
147

    
148
typedef enum {
149
  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
150
  MATROSKA_TRACK_TYPE_AUDIO    = 0x2,
151
  MATROSKA_TRACK_TYPE_COMPLEX  = 0x3,
152
  MATROSKA_TRACK_TYPE_LOGO     = 0x10,
153
  MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
154
  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
155
} MatroskaTrackType;
156

    
157
typedef enum {
158
  MATROSKA_EYE_MODE_MONO  = 0x0,
159
  MATROSKA_EYE_MODE_RIGHT = 0x1,
160
  MATROSKA_EYE_MODE_LEFT  = 0x2,
161
  MATROSKA_EYE_MODE_BOTH  = 0x3,
162
} MatroskaEyeMode;
163

    
164
typedef enum {
165
  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
166
  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
167
  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
168
} MatroskaAspectRatioMode;
169

    
170
/*
171
 * These aren't in any way "matroska-form" things,
172
 * it's just something I use in the muxer/demuxer.
173
 */
174

    
175
typedef enum {
176
  MATROSKA_TRACK_ENABLED = (1<<0),
177
  MATROSKA_TRACK_DEFAULT = (1<<1),
178
  MATROSKA_TRACK_LACING  = (1<<2),
179
  MATROSKA_TRACK_REAL_V  = (1<<4),
180
  MATROSKA_TRACK_SHIFT   = (1<<16)
181
} MatroskaTrackFlags;
182

    
183
typedef enum {
184
  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
185
} MatroskaVideoTrackFlags;
186

    
187
/*
188
 * Matroska Codec IDs. Strings.
189
 */
190

    
191
typedef struct CodecTags{
192
    const char *str;
193
    enum CodecID id;
194
}CodecTags;
195

    
196
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
197
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
198

    
199
static CodecTags codec_tags[]={
200
//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
201
    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
202
    {"V_MPEG4/ISO/SP"   , CODEC_ID_MPEG4},
203
    {"V_MPEG4/ISO/ASP"  , CODEC_ID_MPEG4},
204
    {"V_MPEG4/ISO/AP"   , CODEC_ID_MPEG4},
205
    {"V_MPEG4/ISO/AVC"  , CODEC_ID_H264},
206
    {"V_MPEG4/MS/V3"    , CODEC_ID_MSMPEG4V3},
207
    {"V_MPEG1"          , CODEC_ID_MPEG1VIDEO},
208
    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
209
    {"V_MJPEG"          , CODEC_ID_MJPEG},
210
    {"V_REAL/RV10"      , CODEC_ID_RV10},
211
    {"V_REAL/RV20"      , CODEC_ID_RV20},
212
    {"V_REAL/RV30"      , CODEC_ID_RV30},
213
    {"V_REAL/RV40"      , CODEC_ID_RV40},
214
/* TODO: Real/Quicktime */
215

    
216
//    {"A_MS/ACM"         , CODEC_ID_NONE},
217
    {"A_MPEG/L1"        , CODEC_ID_MP3},
218
    {"A_MPEG/L2"        , CODEC_ID_MP3},
219
    {"A_MPEG/L3"        , CODEC_ID_MP3},
220
    {"A_PCM/INT/BIG"    , CODEC_ID_PCM_U16BE},
221
    {"A_PCM/INT/LIT"    , CODEC_ID_PCM_U16LE},
222
//    {"A_PCM/FLOAT/IEEE" , CODEC_ID_NONE},
223
    {"A_AC3"            , CODEC_ID_AC3},
224
    {"A_DTS"            , CODEC_ID_DTS},
225
    {"A_VORBIS"         , CODEC_ID_VORBIS},
226
    {"A_AAC"            , CODEC_ID_AAC},
227
    {"A_WAVPACK4"       , CODEC_ID_WAVPACK},
228
    {"A_TTA1"           , CODEC_ID_TTA},
229
    {NULL               , CODEC_ID_NONE}
230
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
231
};
232

    
233
/* max. depth in the EBML tree structure */
234
#define EBML_MAX_DEPTH 16
235

    
236
typedef struct Track {
237
    MatroskaTrackType type;
238

    
239
    /* Unique track number and track ID. stream_index is the index that
240
     * the calling app uses for this track. */
241
    uint32_t num,
242
        uid,
243
        stream_index;
244

    
245
    char *name,
246
        *language;
247

    
248
    char *codec_id,
249
        *codec_name;
250

    
251
    unsigned char *codec_priv;
252
    int codec_priv_size;
253

    
254
    int64_t default_duration;
255
    MatroskaTrackFlags flags;
256
} MatroskaTrack;
257

    
258
typedef struct MatroskaVideoTrack {
259
    MatroskaTrack track;
260

    
261
    int pixel_width,
262
        pixel_height,
263
        display_width,
264
        display_height;
265

    
266
    uint32_t fourcc;
267

    
268
    MatroskaAspectRatioMode ar_mode;
269
    MatroskaEyeMode eye_mode;
270

    
271
    //..
272
} MatroskaVideoTrack;
273

    
274
typedef struct MatroskaAudioTrack {
275
    MatroskaTrack track;
276

    
277
    int channels,
278
        bitdepth,
279
        internal_samplerate,
280
        samplerate;
281
    //..
282
} MatroskaAudioTrack;
283

    
284
typedef struct MatroskaSubtitleTrack {
285
    MatroskaTrack track;
286

    
287
    //..
288
} MatroskaSubtitleTrack;
289

    
290
typedef struct MatroskaLevel {
291
    uint64_t start, length;
292
} MatroskaLevel;
293

    
294
typedef struct MatroskaDemuxIndex {
295
  uint64_t        pos;   /* of the corresponding *cluster*! */
296
  uint16_t        track; /* reference to 'num' */
297
  uint64_t        time;  /* in nanoseconds */
298
} MatroskaDemuxIndex;
299

    
300
typedef struct MatroskaDemuxContext {
301
    AVFormatContext *ctx;
302

    
303
    /* ebml stuff */
304
    int num_levels;
305
    MatroskaLevel levels[EBML_MAX_DEPTH];
306
    int level_up;
307

    
308
    /* matroska stuff */
309
    char *writing_app,
310
        *muxing_app;
311
    int64_t created;
312

    
313
    /* timescale in the file */
314
    int64_t time_scale;
315

    
316
    /* position (time, ns) */
317
    int64_t pos;
318

    
319
    /* num_streams is the number of streams that av_new_stream() was called
320
     * for ( = that are available to the calling program). */
321
    int num_tracks, num_streams;
322
    MatroskaTrack *tracks[MAX_STREAMS];
323

    
324
    /* cache for ID peeking */
325
    uint32_t peek_id;
326

    
327
    /* byte position of the segment inside the stream */
328
    offset_t segment_start;
329

    
330
    /* The packet queue. */
331
    AVPacket **packets;
332
    int num_packets;
333

    
334
    /* have we already parse metadata/cues/clusters? */
335
    int metadata_parsed,
336
        index_parsed,
337
        done;
338

    
339
    /* The index for seeking. */
340
    int num_indexes;
341
    MatroskaDemuxIndex *index;
342
} MatroskaDemuxContext;
343

    
344
/*
345
 * The first few functions handle EBML file parsing. The rest
346
 * is the document interpretation. Matroska really just is a
347
 * EBML file.
348
 */
349

    
350
/*
351
 * Return: the amount of levels in the hierarchy that the
352
 * current element lies higher than the previous one.
353
 * The opposite isn't done - that's auto-done using master
354
 * element reading.
355
 */
356

    
357
static int
358
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
359
{
360
    ByteIOContext *pb = &matroska->ctx->pb;
361
    offset_t pos = url_ftell(pb);
362
    int num = 0;
363

    
364
    while (matroska->num_levels > 0) {
365
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
366

    
367
        if (pos >= level->start + level->length) {
368
            matroska->num_levels--;
369
            num++;
370
        } else {
371
            break;
372
        }
373
    }
374

    
375
    return num;
376
}
377

    
378
/*
379
 * Read: an "EBML number", which is defined as a variable-length
380
 * array of bytes. The first byte indicates the length by giving a
381
 * number of 0-bits followed by a one. The position of the first
382
 * "one" bit inside the first byte indicates the length of this
383
 * number.
384
 * Returns: num. of bytes read. < 0 on error.
385
 */
386

    
387
static int
388
ebml_read_num (MatroskaDemuxContext *matroska,
389
               int                   max_size,
390
               uint64_t             *number)
391
{
392
    ByteIOContext *pb = &matroska->ctx->pb;
393
    int len_mask = 0x80, read = 1, n = 1;
394
    int64_t total = 0;
395

    
396
    /* the first byte tells us the length in bytes - get_byte() can normally
397
     * return 0, but since that's not a valid first ebmlID byte, we can
398
     * use it safely here to catch EOS. */
399
    if (!(total = get_byte(pb))) {
400
        /* we might encounter EOS here */
401
        if (!url_feof(pb)) {
402
            offset_t pos = url_ftell(pb);
403
            av_log(matroska->ctx, AV_LOG_ERROR,
404
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
405
                   pos, pos);
406
        }
407
        return AVERROR_IO; /* EOS or actual I/O error */
408
    }
409

    
410
    /* get the length of the EBML number */
411
    while (read <= max_size && !(total & len_mask)) {
412
        read++;
413
        len_mask >>= 1;
414
    }
415
    if (read > max_size) {
416
        offset_t pos = url_ftell(pb) - 1;
417
        av_log(matroska->ctx, AV_LOG_ERROR,
418
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
419
               (uint8_t) total, pos, pos);
420
        return AVERROR_INVALIDDATA;
421
    }
422

    
423
    /* read out length */
424
    total &= ~len_mask;
425
    while (n++ < read)
426
        total = (total << 8) | get_byte(pb);
427

    
428
    *number = total;
429

    
430
    return read;
431
}
432

    
433
/*
434
 * Read: the element content data ID.
435
 * Return: the number of bytes read or < 0 on error.
436
 */
437

    
438
static int
439
ebml_read_element_id (MatroskaDemuxContext *matroska,
440
                      uint32_t             *id,
441
                      int                  *level_up)
442
{
443
    int read;
444
    uint64_t total;
445

    
446
    /* if we re-call this, use our cached ID */
447
    if (matroska->peek_id != 0) {
448
        if (level_up)
449
            *level_up = 0;
450
        *id = matroska->peek_id;
451
        return 0;
452
    }
453

    
454
    /* read out the "EBML number", include tag in ID */
455
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
456
        return read;
457
    *id = matroska->peek_id  = total | (1 << (read * 7));
458

    
459
    /* level tracking */
460
    if (level_up)
461
        *level_up = ebml_read_element_level_up(matroska);
462

    
463
    return read;
464
}
465

    
466
/*
467
 * Read: element content length.
468
 * Return: the number of bytes read or < 0 on error.
469
 */
470

    
471
static int
472
ebml_read_element_length (MatroskaDemuxContext *matroska,
473
                          uint64_t             *length)
474
{
475
    /* clear cache since we're now beyond that data point */
476
    matroska->peek_id = 0;
477

    
478
    /* read out the "EBML number", include tag in ID */
479
    return ebml_read_num(matroska, 8, length);
480
}
481

    
482
/*
483
 * Return: the ID of the next element, or 0 on error.
484
 * Level_up contains the amount of levels that this
485
 * next element lies higher than the previous one.
486
 */
487

    
488
static uint32_t
489
ebml_peek_id (MatroskaDemuxContext *matroska,
490
              int                  *level_up)
491
{
492
    uint32_t id;
493

    
494
    assert(level_up != NULL);
495

    
496
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
497
        return 0;
498

    
499
    return id;
500
}
501

    
502
/*
503
 * Seek to a given offset.
504
 * 0 is success, -1 is failure.
505
 */
506

    
507
static int
508
ebml_read_seek (MatroskaDemuxContext *matroska,
509
                offset_t              offset)
510
{
511
    ByteIOContext *pb = &matroska->ctx->pb;
512

    
513
    /* clear ID cache, if any */
514
    matroska->peek_id = 0;
515

    
516
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
517
}
518

    
519
/*
520
 * Skip the next element.
521
 * 0 is success, -1 is failure.
522
 */
523

    
524
static int
525
ebml_read_skip (MatroskaDemuxContext *matroska)
526
{
527
    ByteIOContext *pb = &matroska->ctx->pb;
528
    uint32_t id;
529
    uint64_t length;
530
    int res;
531

    
532
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
533
        (res = ebml_read_element_length(matroska, &length)) < 0)
534
        return res;
535

    
536
    url_fskip(pb, length);
537

    
538
    return 0;
539
}
540

    
541
/*
542
 * Read the next element as an unsigned int.
543
 * 0 is success, < 0 is failure.
544
 */
545

    
546
static int
547
ebml_read_uint (MatroskaDemuxContext *matroska,
548
                uint32_t             *id,
549
                uint64_t             *num)
550
{
551
    ByteIOContext *pb = &matroska->ctx->pb;
552
    int n = 0, size, res;
553
    uint64_t rlength;
554

    
555
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
556
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
557
        return res;
558
    size = rlength;
559
    if (size < 1 || size > 8) {
560
        offset_t pos = url_ftell(pb);
561
        av_log(matroska->ctx, AV_LOG_ERROR,
562
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
563
                size, pos, pos);
564
        return AVERROR_INVALIDDATA;
565
    }
566

    
567
    /* big-endian ordening; build up number */
568
    *num = 0;
569
    while (n++ < size)
570
        *num = (*num << 8) | get_byte(pb);
571

    
572
    return 0;
573
}
574

    
575
/*
576
 * Read the next element as a signed int.
577
 * 0 is success, < 0 is failure.
578
 */
579

    
580
static int
581
ebml_read_sint (MatroskaDemuxContext *matroska,
582
                uint32_t             *id,
583
                int64_t              *num)
584
{
585
    ByteIOContext *pb = &matroska->ctx->pb;
586
    int size, n = 1, negative = 0, res;
587
    uint64_t rlength;
588

    
589
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
590
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
591
        return res;
592
    size = rlength;
593
    if (size < 1 || size > 8) {
594
        offset_t pos = url_ftell(pb);
595
        av_log(matroska->ctx, AV_LOG_ERROR,
596
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
597
                size, pos, pos);
598
        return AVERROR_INVALIDDATA;
599
    }
600
    if ((*num = get_byte(pb)) & 0x80) {
601
        negative = 1;
602
        *num &= ~0x80;
603
    }
604
    *num = 0;
605
    while (n++ < size)
606
        *num = (*num << 8) | get_byte(pb);
607

    
608
    /* make signed */
609
    if (negative)
610
        *num = *num - (1LL << ((8 * size) - 1));
611

    
612
    return 0;
613
}
614

    
615
/*
616
 * Read the next element as a float.
617
 * 0 is success, < 0 is failure.
618
 */
619

    
620
static int
621
ebml_read_float (MatroskaDemuxContext *matroska,
622
                 uint32_t             *id,
623
                 double               *num)
624
{
625
    ByteIOContext *pb = &matroska->ctx->pb;
626
    int size, res;
627
    uint64_t rlength;
628

    
629
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
630
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
631
        return res;
632
    size = rlength;
633

    
634
    if (size == 4) {
635
        *num= av_int2flt(get_be32(pb));
636
    } else if(size==8){
637
        *num= av_int2dbl(get_be64(pb));
638
    } else{
639
        offset_t pos = url_ftell(pb);
640
        av_log(matroska->ctx, AV_LOG_ERROR,
641
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
642
               size, pos, pos);
643
        return AVERROR_INVALIDDATA;
644
    }
645

    
646
    return 0;
647
}
648

    
649
/*
650
 * Read the next element as an ASCII string.
651
 * 0 is success, < 0 is failure.
652
 */
653

    
654
static int
655
ebml_read_ascii (MatroskaDemuxContext *matroska,
656
                 uint32_t             *id,
657
                 char                **str)
658
{
659
    ByteIOContext *pb = &matroska->ctx->pb;
660
    int size, res;
661
    uint64_t rlength;
662

    
663
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
664
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
665
        return res;
666
    size = rlength;
667

    
668
    /* ebml strings are usually not 0-terminated, so we allocate one
669
     * byte more, read the string and NULL-terminate it ourselves. */
670
    if (size < 0 || !(*str = av_malloc(size + 1))) {
671
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
672
        return AVERROR_NOMEM;
673
    }
674
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
675
        offset_t pos = url_ftell(pb);
676
        av_log(matroska->ctx, AV_LOG_ERROR,
677
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
678
        return AVERROR_IO;
679
    }
680
    (*str)[size] = '\0';
681

    
682
    return 0;
683
}
684

    
685
/*
686
 * Read the next element as a UTF-8 string.
687
 * 0 is success, < 0 is failure.
688
 */
689

    
690
static int
691
ebml_read_utf8 (MatroskaDemuxContext *matroska,
692
                uint32_t             *id,
693
                char                **str)
694
{
695
  return ebml_read_ascii(matroska, id, str);
696
}
697

    
698
/*
699
 * Read the next element as a date (nanoseconds since 1/1/2000).
700
 * 0 is success, < 0 is failure.
701
 */
702

    
703
static int
704
ebml_read_date (MatroskaDemuxContext *matroska,
705
                uint32_t             *id,
706
                int64_t              *date)
707
{
708
  return ebml_read_sint(matroska, id, date);
709
}
710

    
711
/*
712
 * Read the next element, but only the header. The contents
713
 * are supposed to be sub-elements which can be read separately.
714
 * 0 is success, < 0 is failure.
715
 */
716

    
717
static int
718
ebml_read_master (MatroskaDemuxContext *matroska,
719
                  uint32_t             *id)
720
{
721
    ByteIOContext *pb = &matroska->ctx->pb;
722
    uint64_t length;
723
    MatroskaLevel *level;
724
    int res;
725

    
726
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
727
        (res = ebml_read_element_length(matroska, &length)) < 0)
728
        return res;
729

    
730
    /* protect... (Heaven forbids that the '>' is true) */
731
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
732
        av_log(matroska->ctx, AV_LOG_ERROR,
733
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
734
        return AVERROR_NOTSUPP;
735
    }
736

    
737
    /* remember level */
738
    level = &matroska->levels[matroska->num_levels++];
739
    level->start = url_ftell(pb);
740
    level->length = length;
741

    
742
    return 0;
743
}
744

    
745
/*
746
 * Read the next element as binary data.
747
 * 0 is success, < 0 is failure.
748
 */
749

    
750
static int
751
ebml_read_binary (MatroskaDemuxContext *matroska,
752
                  uint32_t             *id,
753
                  uint8_t             **binary,
754
                  int                  *size)
755
{
756
    ByteIOContext *pb = &matroska->ctx->pb;
757
    uint64_t rlength;
758
    int res;
759

    
760
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
761
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
762
        return res;
763
    *size = rlength;
764

    
765
    if (!(*binary = av_malloc(*size))) {
766
        av_log(matroska->ctx, AV_LOG_ERROR,
767
               "Memory allocation error\n");
768
        return AVERROR_NOMEM;
769
    }
770

    
771
    if (get_buffer(pb, *binary, *size) != *size) {
772
        offset_t pos = url_ftell(pb);
773
        av_log(matroska->ctx, AV_LOG_ERROR,
774
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
775
        return AVERROR_IO;
776
    }
777

    
778
    return 0;
779
}
780

    
781
/*
782
 * Read signed/unsigned "EBML" numbers.
783
 * Return: number of bytes processed, < 0 on error.
784
 * XXX: use ebml_read_num().
785
 */
786

    
787
static int
788
matroska_ebmlnum_uint (uint8_t  *data,
789
                       uint32_t  size,
790
                       uint64_t *num)
791
{
792
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
793
    uint64_t total;
794

    
795
    if (size <= 0)
796
        return AVERROR_INVALIDDATA;
797

    
798
    total = data[0];
799
    while (read <= 8 && !(total & len_mask)) {
800
        read++;
801
        len_mask >>= 1;
802
    }
803
    if (read > 8)
804
        return AVERROR_INVALIDDATA;
805

    
806
    if ((total &= (len_mask - 1)) == len_mask - 1)
807
        num_ffs++;
808
    if (size < read)
809
        return AVERROR_INVALIDDATA;
810
    while (n < read) {
811
        if (data[n] == 0xff)
812
            num_ffs++;
813
        total = (total << 8) | data[n];
814
        n++;
815
    }
816

    
817
    if (read == num_ffs)
818
        *num = (uint64_t)-1;
819
    else
820
        *num = total;
821

    
822
    return read;
823
}
824

    
825
/*
826
 * Same as above, but signed.
827
 */
828

    
829
static int
830
matroska_ebmlnum_sint (uint8_t  *data,
831
                       uint32_t  size,
832
                       int64_t  *num)
833
{
834
    uint64_t unum;
835
    int res;
836

    
837
    /* read as unsigned number first */
838
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
839
        return res;
840

    
841
    /* make signed (weird way) */
842
    if (unum == (uint64_t)-1)
843
        *num = INT64_MAX;
844
    else
845
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
846

    
847
    return res;
848
}
849

    
850
/*
851
 * Read an EBML header.
852
 * 0 is success, < 0 is failure.
853
 */
854

    
855
static int
856
ebml_read_header (MatroskaDemuxContext *matroska,
857
                  char                **doctype,
858
                  int                  *version)
859
{
860
    uint32_t id;
861
    int level_up, res = 0;
862

    
863
    /* default init */
864
    if (doctype)
865
        *doctype = NULL;
866
    if (version)
867
        *version = 1;
868

    
869
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
870
        level_up != 0 || id != EBML_ID_HEADER) {
871
        av_log(matroska->ctx, AV_LOG_ERROR,
872
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
873
        return AVERROR_INVALIDDATA;
874
    }
875
    if ((res = ebml_read_master(matroska, &id)) < 0)
876
        return res;
877

    
878
    while (res == 0) {
879
        if (!(id = ebml_peek_id(matroska, &level_up)))
880
            return AVERROR_IO;
881

    
882
        /* end-of-header */
883
        if (level_up)
884
            break;
885

    
886
        switch (id) {
887
            /* is our read version uptodate? */
888
            case EBML_ID_EBMLREADVERSION: {
889
                uint64_t num;
890

    
891
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
892
                    return res;
893
                if (num > EBML_VERSION) {
894
                    av_log(matroska->ctx, AV_LOG_ERROR,
895
                           "EBML version %"PRIu64" (> %d) is not supported\n",
896
                           num, EBML_VERSION);
897
                    return AVERROR_INVALIDDATA;
898
                }
899
                break;
900
            }
901

    
902
            /* we only handle 8 byte lengths at max */
903
            case EBML_ID_EBMLMAXSIZELENGTH: {
904
                uint64_t num;
905

    
906
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
907
                    return res;
908
                if (num > sizeof(uint64_t)) {
909
                    av_log(matroska->ctx, AV_LOG_ERROR,
910
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
911
                           num, sizeof(uint64_t));
912
                    return AVERROR_INVALIDDATA;
913
                }
914
                break;
915
            }
916

    
917
            /* we handle 4 byte IDs at max */
918
            case EBML_ID_EBMLMAXIDLENGTH: {
919
                uint64_t num;
920

    
921
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
922
                    return res;
923
                if (num > sizeof(uint32_t)) {
924
                    av_log(matroska->ctx, AV_LOG_ERROR,
925
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
926
                            num, sizeof(uint32_t));
927
                    return AVERROR_INVALIDDATA;
928
                }
929
                break;
930
            }
931

    
932
            case EBML_ID_DOCTYPE: {
933
                char *text;
934

    
935
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
936
                    return res;
937
                if (doctype) {
938
                    if (*doctype)
939
                        av_free(*doctype);
940
                    *doctype = text;
941
                } else
942
                    av_free(text);
943
                break;
944
            }
945

    
946
            case EBML_ID_DOCTYPEREADVERSION: {
947
                uint64_t num;
948

    
949
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
950
                    return res;
951
                if (version)
952
                    *version = num;
953
                break;
954
            }
955

    
956
            default:
957
                av_log(matroska->ctx, AV_LOG_INFO,
958
                       "Unknown data type 0x%x in EBML header", id);
959
                /* pass-through */
960

    
961
            case EBML_ID_VOID:
962
            /* we ignore these two, as they don't tell us anything we
963
             * care about */
964
            case EBML_ID_EBMLVERSION:
965
            case EBML_ID_DOCTYPEVERSION:
966
                res = ebml_read_skip (matroska);
967
                break;
968
        }
969
    }
970

    
971
    return 0;
972
}
973

    
974
/*
975
 * Put one packet in an application-supplied AVPacket struct.
976
 * Returns 0 on success or -1 on failure.
977
 */
978

    
979
static int
980
matroska_deliver_packet (MatroskaDemuxContext *matroska,
981
                         AVPacket             *pkt)
982
{
983
    if (matroska->num_packets > 0) {
984
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
985
        av_free(matroska->packets[0]);
986
        if (matroska->num_packets > 1) {
987
            memmove(&matroska->packets[0], &matroska->packets[1],
988
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
989
            matroska->packets =
990
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
991
                           sizeof(AVPacket *));
992
        } else {
993
            av_freep(&matroska->packets);
994
        }
995
        matroska->num_packets--;
996
        return 0;
997
    }
998

    
999
    return -1;
1000
}
1001

    
1002
/*
1003
 * Put a packet into our internal queue. Will be delivered to the
1004
 * user/application during the next get_packet() call.
1005
 */
1006

    
1007
static void
1008
matroska_queue_packet (MatroskaDemuxContext *matroska,
1009
                       AVPacket             *pkt)
1010
{
1011
    matroska->packets =
1012
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1013
                   sizeof(AVPacket *));
1014
    matroska->packets[matroska->num_packets] = pkt;
1015
    matroska->num_packets++;
1016
}
1017

    
1018
/*
1019
 * Autodetecting...
1020
 */
1021

    
1022
static int
1023
matroska_probe (AVProbeData *p)
1024
{
1025
    uint64_t total = 0;
1026
    int len_mask = 0x80, size = 1, n = 1;
1027
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1028

    
1029
    if (p->buf_size < 5)
1030
        return 0;
1031

    
1032
    /* ebml header? */
1033
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1034
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1035
        return 0;
1036

    
1037
    /* length of header */
1038
    total = p->buf[4];
1039
    while (size <= 8 && !(total & len_mask)) {
1040
        size++;
1041
        len_mask >>= 1;
1042
    }
1043
    if (size > 8)
1044
      return 0;
1045
    total &= (len_mask - 1);
1046
    while (n < size)
1047
        total = (total << 8) | p->buf[4 + n++];
1048

    
1049
    /* does the probe data contain the whole header? */
1050
    if (p->buf_size < 4 + size + total)
1051
      return 0;
1052

    
1053
    /* the header must contain the document type 'matroska'. For now,
1054
     * we don't parse the whole header but simply check for the
1055
     * availability of that array of characters inside the header.
1056
     * Not fully fool-proof, but good enough. */
1057
    for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
1058
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1059
            return AVPROBE_SCORE_MAX;
1060

    
1061
    return 0;
1062
}
1063

    
1064
/*
1065
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1066
 */
1067

    
1068
static int
1069
matroska_parse_info (MatroskaDemuxContext *matroska)
1070
{
1071
    int res = 0;
1072
    uint32_t id;
1073

    
1074
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1075

    
1076
    while (res == 0) {
1077
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1078
            res = AVERROR_IO;
1079
            break;
1080
        } else if (matroska->level_up) {
1081
            matroska->level_up--;
1082
            break;
1083
        }
1084

    
1085
        switch (id) {
1086
            /* cluster timecode */
1087
            case MATROSKA_ID_TIMECODESCALE: {
1088
                uint64_t num;
1089
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1090
                    break;
1091
                matroska->time_scale = num;
1092
                break;
1093
            }
1094

    
1095
            case MATROSKA_ID_DURATION: {
1096
                double num;
1097
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1098
                    break;
1099
                matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
1100
                break;
1101
            }
1102

    
1103
            case MATROSKA_ID_TITLE: {
1104
                char *text;
1105
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1106
                    break;
1107
                strncpy(matroska->ctx->title, text,
1108
                        sizeof(matroska->ctx->title)-1);
1109
                av_free(text);
1110
                break;
1111
            }
1112

    
1113
            case MATROSKA_ID_WRITINGAPP: {
1114
                char *text;
1115
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1116
                    break;
1117
                matroska->writing_app = text;
1118
                break;
1119
            }
1120

    
1121
            case MATROSKA_ID_MUXINGAPP: {
1122
                char *text;
1123
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1124
                    break;
1125
                matroska->muxing_app = text;
1126
                break;
1127
            }
1128

    
1129
            case MATROSKA_ID_DATEUTC: {
1130
                int64_t time;
1131
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1132
                    break;
1133
                matroska->created = time;
1134
                break;
1135
            }
1136

    
1137
            default:
1138
                av_log(matroska->ctx, AV_LOG_INFO,
1139
                       "Unknown entry 0x%x in info header\n", id);
1140
                /* fall-through */
1141

    
1142
            case EBML_ID_VOID:
1143
                res = ebml_read_skip(matroska);
1144
                break;
1145
        }
1146

    
1147
        if (matroska->level_up) {
1148
            matroska->level_up--;
1149
            break;
1150
        }
1151
    }
1152

    
1153
    return res;
1154
}
1155

    
1156
static int
1157
matroska_add_stream (MatroskaDemuxContext *matroska)
1158
{
1159
    int res = 0;
1160
    uint32_t id;
1161
    MatroskaTrack *track;
1162

    
1163
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1164

    
1165
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1166
    track = av_mallocz(sizeof(MatroskaTrack));
1167
    matroska->num_tracks++;
1168

    
1169
    /* start with the master */
1170
    if ((res = ebml_read_master(matroska, &id)) < 0)
1171
        return res;
1172

    
1173
    /* try reading the trackentry headers */
1174
    while (res == 0) {
1175
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1176
            res = AVERROR_IO;
1177
            break;
1178
        } else if (matroska->level_up > 0) {
1179
            matroska->level_up--;
1180
            break;
1181
        }
1182

    
1183
        switch (id) {
1184
            /* track number (unique stream ID) */
1185
            case MATROSKA_ID_TRACKNUMBER: {
1186
                uint64_t num;
1187
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1188
                    break;
1189
                track->num = num;
1190
                break;
1191
            }
1192

    
1193
            /* track UID (unique identifier) */
1194
            case MATROSKA_ID_TRACKUID: {
1195
                uint64_t num;
1196
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1197
                    break;
1198
                track->uid = num;
1199
                break;
1200
            }
1201

    
1202
            /* track type (video, audio, combined, subtitle, etc.) */
1203
            case MATROSKA_ID_TRACKTYPE: {
1204
                uint64_t num;
1205
                if (track->type != 0) {
1206
                    av_log(matroska->ctx, AV_LOG_INFO,
1207
                           "More than one tracktype in an entry - skip\n");
1208
                    break;
1209
                }
1210
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1211
                    break;
1212
                track->type = num;
1213

    
1214
                /* ok, so we're actually going to reallocate this thing */
1215
                switch (track->type) {
1216
                    case MATROSKA_TRACK_TYPE_VIDEO:
1217
                        track = (MatroskaTrack *)
1218
                            av_realloc(track, sizeof(MatroskaVideoTrack));
1219
                        break;
1220
                    case MATROSKA_TRACK_TYPE_AUDIO:
1221
                        track = (MatroskaTrack *)
1222
                            av_realloc(track, sizeof(MatroskaAudioTrack));
1223
                        ((MatroskaAudioTrack *)track)->channels = 1;
1224
                        ((MatroskaAudioTrack *)track)->samplerate = 8000;
1225
                        break;
1226
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1227
                        track = (MatroskaTrack *)
1228
                            av_realloc(track, sizeof(MatroskaSubtitleTrack));
1229
                        break;
1230
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1231
                    case MATROSKA_TRACK_TYPE_LOGO:
1232
                    case MATROSKA_TRACK_TYPE_CONTROL:
1233
                    default:
1234
                        av_log(matroska->ctx, AV_LOG_INFO,
1235
                               "Unknown or unsupported track type 0x%x\n",
1236
                               track->type);
1237
                        track->type = 0;
1238
                        break;
1239
                }
1240
                matroska->tracks[matroska->num_tracks - 1] = track;
1241
                break;
1242
            }
1243

    
1244
            /* tracktype specific stuff for video */
1245
            case MATROSKA_ID_TRACKVIDEO: {
1246
                MatroskaVideoTrack *videotrack;
1247
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1248
                    av_log(matroska->ctx, AV_LOG_INFO,
1249
                           "video data in non-video track - ignoring\n");
1250
                    res = AVERROR_INVALIDDATA;
1251
                    break;
1252
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1253
                    break;
1254
                videotrack = (MatroskaVideoTrack *)track;
1255

    
1256
                while (res == 0) {
1257
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1258
                        res = AVERROR_IO;
1259
                        break;
1260
                    } else if (matroska->level_up > 0) {
1261
                        matroska->level_up--;
1262
                        break;
1263
                    }
1264

    
1265
                    switch (id) {
1266
                        /* fixme, this should be one-up, but I get it here */
1267
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1268
                            uint64_t num;
1269
                            if ((res = ebml_read_uint (matroska, &id,
1270
                                                       &num)) < 0)
1271
                                break;
1272
                            track->default_duration = num;
1273
                            break;
1274
                        }
1275

    
1276
                        /* video framerate */
1277
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1278
                            double num;
1279
                            if ((res = ebml_read_float(matroska, &id,
1280
                                                       &num)) < 0)
1281
                                break;
1282
                            track->default_duration = 1000000000 * (1. / num);
1283
                            break;
1284
                        }
1285

    
1286
                        /* width of the size to display the video at */
1287
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1288
                            uint64_t num;
1289
                            if ((res = ebml_read_uint(matroska, &id,
1290
                                                      &num)) < 0)
1291
                                break;
1292
                            videotrack->display_width = num;
1293
                            break;
1294
                        }
1295

    
1296
                        /* height of the size to display the video at */
1297
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1298
                            uint64_t num;
1299
                            if ((res = ebml_read_uint(matroska, &id,
1300
                                                      &num)) < 0)
1301
                                break;
1302
                            videotrack->display_height = num;
1303
                            break;
1304
                        }
1305

    
1306
                        /* width of the video in the file */
1307
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1308
                            uint64_t num;
1309
                            if ((res = ebml_read_uint(matroska, &id,
1310
                                                      &num)) < 0)
1311
                                break;
1312
                            videotrack->pixel_width = num;
1313
                            break;
1314
                        }
1315

    
1316
                        /* height of the video in the file */
1317
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1318
                            uint64_t num;
1319
                            if ((res = ebml_read_uint(matroska, &id,
1320
                                                      &num)) < 0)
1321
                                break;
1322
                            videotrack->pixel_height = num;
1323
                            break;
1324
                        }
1325

    
1326
                        /* whether the video is interlaced */
1327
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1328
                            uint64_t num;
1329
                            if ((res = ebml_read_uint(matroska, &id,
1330
                                                      &num)) < 0)
1331
                                break;
1332
                            if (num)
1333
                                track->flags |=
1334
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1335
                            else
1336
                                track->flags &=
1337
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1338
                            break;
1339
                        }
1340

    
1341
                        /* stereo mode (whether the video has two streams,
1342
                         * where one is for the left eye and the other for
1343
                         * the right eye, which creates a 3D-like
1344
                         * effect) */
1345
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1346
                            uint64_t num;
1347
                            if ((res = ebml_read_uint(matroska, &id,
1348
                                                      &num)) < 0)
1349
                                break;
1350
                            if (num != MATROSKA_EYE_MODE_MONO &&
1351
                                num != MATROSKA_EYE_MODE_LEFT &&
1352
                                num != MATROSKA_EYE_MODE_RIGHT &&
1353
                                num != MATROSKA_EYE_MODE_BOTH) {
1354
                                av_log(matroska->ctx, AV_LOG_INFO,
1355
                                       "Ignoring unknown eye mode 0x%x\n",
1356
                                       (uint32_t) num);
1357
                                break;
1358
                            }
1359
                            videotrack->eye_mode = num;
1360
                            break;
1361
                        }
1362

    
1363
                        /* aspect ratio behaviour */
1364
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1365
                            uint64_t num;
1366
                            if ((res = ebml_read_uint(matroska, &id,
1367
                                                      &num)) < 0)
1368
                                break;
1369
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1370
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1371
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1372
                                av_log(matroska->ctx, AV_LOG_INFO,
1373
                                       "Ignoring unknown aspect ratio 0x%x\n",
1374
                                       (uint32_t) num);
1375
                                break;
1376
                            }
1377
                            videotrack->ar_mode = num;
1378
                            break;
1379
                        }
1380

    
1381
                        /* colourspace (only matters for raw video)
1382
                         * fourcc */
1383
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1384
                            uint64_t num;
1385
                            if ((res = ebml_read_uint(matroska, &id,
1386
                                                      &num)) < 0)
1387
                                break;
1388
                            videotrack->fourcc = num;
1389
                            break;
1390
                        }
1391

    
1392
                        default:
1393
                            av_log(matroska->ctx, AV_LOG_INFO,
1394
                                   "Unknown video track header entry "
1395
                                   "0x%x - ignoring\n", id);
1396
                            /* pass-through */
1397

    
1398
                        case EBML_ID_VOID:
1399
                            res = ebml_read_skip(matroska);
1400
                            break;
1401
                    }
1402

    
1403
                    if (matroska->level_up) {
1404
                        matroska->level_up--;
1405
                        break;
1406
                    }
1407
                }
1408
                break;
1409
            }
1410

    
1411
            /* tracktype specific stuff for audio */
1412
            case MATROSKA_ID_TRACKAUDIO: {
1413
                MatroskaAudioTrack *audiotrack;
1414
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1415
                    av_log(matroska->ctx, AV_LOG_INFO,
1416
                           "audio data in non-audio track - ignoring\n");
1417
                    res = AVERROR_INVALIDDATA;
1418
                    break;
1419
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1420
                    break;
1421
                audiotrack = (MatroskaAudioTrack *)track;
1422

    
1423
                while (res == 0) {
1424
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1425
                        res = AVERROR_IO;
1426
                        break;
1427
                    } else if (matroska->level_up > 0) {
1428
                        matroska->level_up--;
1429
                        break;
1430
                    }
1431

    
1432
                    switch (id) {
1433
                        /* samplerate */
1434
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1435
                            double num;
1436
                            if ((res = ebml_read_float(matroska, &id,
1437
                                                       &num)) < 0)
1438
                                break;
1439
                            audiotrack->internal_samplerate =
1440
                            audiotrack->samplerate = num;
1441
                            break;
1442
                        }
1443

    
1444
                        case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: {
1445
                            double num;
1446
                            if ((res = ebml_read_float(matroska, &id,
1447
                                                       &num)) < 0)
1448
                                break;
1449
                            audiotrack->samplerate = num;
1450
                            break;
1451
                        }
1452

    
1453
                            /* bitdepth */
1454
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1455
                            uint64_t num;
1456
                            if ((res = ebml_read_uint(matroska, &id,
1457
                                                      &num)) < 0)
1458
                                break;
1459
                            audiotrack->bitdepth = num;
1460
                            break;
1461
                        }
1462

    
1463
                            /* channels */
1464
                        case MATROSKA_ID_AUDIOCHANNELS: {
1465
                            uint64_t num;
1466
                            if ((res = ebml_read_uint(matroska, &id,
1467
                                                      &num)) < 0)
1468
                                break;
1469
                            audiotrack->channels = num;
1470
                            break;
1471
                        }
1472

    
1473
                        default:
1474
                            av_log(matroska->ctx, AV_LOG_INFO,
1475
                                   "Unknown audio track header entry "
1476
                                   "0x%x - ignoring\n", id);
1477
                            /* pass-through */
1478

    
1479
                        case EBML_ID_VOID:
1480
                            res = ebml_read_skip(matroska);
1481
                            break;
1482
                    }
1483

    
1484
                    if (matroska->level_up) {
1485
                        matroska->level_up--;
1486
                        break;
1487
                    }
1488
                }
1489
                break;
1490
            }
1491

    
1492
                /* codec identifier */
1493
            case MATROSKA_ID_CODECID: {
1494
                char *text;
1495
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1496
                    break;
1497
                track->codec_id = text;
1498
                break;
1499
            }
1500

    
1501
                /* codec private data */
1502
            case MATROSKA_ID_CODECPRIVATE: {
1503
                uint8_t *data;
1504
                int size;
1505
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1506
                    break;
1507
                track->codec_priv = data;
1508
                track->codec_priv_size = size;
1509
                break;
1510
            }
1511

    
1512
                /* name of the codec */
1513
            case MATROSKA_ID_CODECNAME: {
1514
                char *text;
1515
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1516
                    break;
1517
                track->codec_name = text;
1518
                break;
1519
            }
1520

    
1521
                /* name of this track */
1522
            case MATROSKA_ID_TRACKNAME: {
1523
                char *text;
1524
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1525
                    break;
1526
                track->name = text;
1527
                break;
1528
            }
1529

    
1530
                /* language (matters for audio/subtitles, mostly) */
1531
            case MATROSKA_ID_TRACKLANGUAGE: {
1532
                char *text;
1533
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1534
                    break;
1535
                track->language = text;
1536
                break;
1537
            }
1538

    
1539
                /* whether this is actually used */
1540
            case MATROSKA_ID_TRACKFLAGENABLED: {
1541
                uint64_t num;
1542
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1543
                    break;
1544
                if (num)
1545
                    track->flags |= MATROSKA_TRACK_ENABLED;
1546
                else
1547
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1548
                break;
1549
            }
1550

    
1551
                /* whether it's the default for this track type */
1552
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1553
                uint64_t num;
1554
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1555
                    break;
1556
                if (num)
1557
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1558
                else
1559
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1560
                break;
1561
            }
1562

    
1563
                /* lacing (like MPEG, where blocks don't end/start on frame
1564
                 * boundaries) */
1565
            case MATROSKA_ID_TRACKFLAGLACING: {
1566
                uint64_t num;
1567
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1568
                    break;
1569
                if (num)
1570
                    track->flags |= MATROSKA_TRACK_LACING;
1571
                else
1572
                    track->flags &= ~MATROSKA_TRACK_LACING;
1573
                break;
1574
            }
1575

    
1576
                /* default length (in time) of one data block in this track */
1577
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1578
                uint64_t num;
1579
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1580
                    break;
1581
                track->default_duration = num;
1582
                break;
1583
            }
1584

    
1585
            default:
1586
                av_log(matroska->ctx, AV_LOG_INFO,
1587
                       "Unknown track header entry 0x%x - ignoring\n", id);
1588
                /* pass-through */
1589

    
1590
            case EBML_ID_VOID:
1591
            /* we ignore these because they're nothing useful. */
1592
            case MATROSKA_ID_CODECINFOURL:
1593
            case MATROSKA_ID_CODECDOWNLOADURL:
1594
            case MATROSKA_ID_TRACKMINCACHE:
1595
            case MATROSKA_ID_TRACKMAXCACHE:
1596
                res = ebml_read_skip(matroska);
1597
                break;
1598
        }
1599

    
1600
        if (matroska->level_up) {
1601
            matroska->level_up--;
1602
            break;
1603
        }
1604
    }
1605

    
1606
    return res;
1607
}
1608

    
1609
static int
1610
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1611
{
1612
    int res = 0;
1613
    uint32_t id;
1614

    
1615
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1616

    
1617
    while (res == 0) {
1618
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1619
            res = AVERROR_IO;
1620
            break;
1621
        } else if (matroska->level_up) {
1622
            matroska->level_up--;
1623
            break;
1624
        }
1625

    
1626
        switch (id) {
1627
            /* one track within the "all-tracks" header */
1628
            case MATROSKA_ID_TRACKENTRY:
1629
                res = matroska_add_stream(matroska);
1630
                break;
1631

    
1632
            default:
1633
                av_log(matroska->ctx, AV_LOG_INFO,
1634
                       "Unknown entry 0x%x in track header\n", id);
1635
                /* fall-through */
1636

    
1637
            case EBML_ID_VOID:
1638
                res = ebml_read_skip(matroska);
1639
                break;
1640
        }
1641

    
1642
        if (matroska->level_up) {
1643
            matroska->level_up--;
1644
            break;
1645
        }
1646
    }
1647

    
1648
    return res;
1649
}
1650

    
1651
static int
1652
matroska_parse_index (MatroskaDemuxContext *matroska)
1653
{
1654
    int res = 0;
1655
    uint32_t id;
1656
    MatroskaDemuxIndex idx;
1657

    
1658
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1659

    
1660
    while (res == 0) {
1661
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1662
            res = AVERROR_IO;
1663
            break;
1664
        } else if (matroska->level_up) {
1665
            matroska->level_up--;
1666
            break;
1667
        }
1668

    
1669
        switch (id) {
1670
            /* one single index entry ('point') */
1671
            case MATROSKA_ID_POINTENTRY:
1672
                if ((res = ebml_read_master(matroska, &id)) < 0)
1673
                    break;
1674

    
1675
                /* in the end, we hope to fill one entry with a
1676
                 * timestamp, a file position and a tracknum */
1677
                idx.pos   = (uint64_t) -1;
1678
                idx.time  = (uint64_t) -1;
1679
                idx.track = (uint16_t) -1;
1680

    
1681
                while (res == 0) {
1682
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1683
                        res = AVERROR_IO;
1684
                        break;
1685
                    } else if (matroska->level_up) {
1686
                        matroska->level_up--;
1687
                        break;
1688
                    }
1689

    
1690
                    switch (id) {
1691
                        /* one single index entry ('point') */
1692
                        case MATROSKA_ID_CUETIME: {
1693
                            uint64_t time;
1694
                            if ((res = ebml_read_uint(matroska, &id,
1695
                                                      &time)) < 0)
1696
                                break;
1697
                            idx.time = time * matroska->time_scale;
1698
                            break;
1699
                        }
1700

    
1701
                        /* position in the file + track to which it
1702
                         * belongs */
1703
                        case MATROSKA_ID_CUETRACKPOSITION:
1704
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1705
                                break;
1706

    
1707
                            while (res == 0) {
1708
                                if (!(id = ebml_peek_id (matroska,
1709
                                                    &matroska->level_up))) {
1710
                                    res = AVERROR_IO;
1711
                                    break;
1712
                                } else if (matroska->level_up) {
1713
                                    matroska->level_up--;
1714
                                    break;
1715
                                }
1716

    
1717
                                switch (id) {
1718
                                    /* track number */
1719
                                    case MATROSKA_ID_CUETRACK: {
1720
                                        uint64_t num;
1721
                                        if ((res = ebml_read_uint(matroska,
1722
                                                          &id, &num)) < 0)
1723
                                            break;
1724
                                        idx.track = num;
1725
                                        break;
1726
                                    }
1727

    
1728
                                        /* position in file */
1729
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1730
                                        uint64_t num;
1731
                                        if ((res = ebml_read_uint(matroska,
1732
                                                          &id, &num)) < 0)
1733
                                            break;
1734
                                        idx.pos = num;
1735
                                        break;
1736
                                    }
1737

    
1738
                                    default:
1739
                                        av_log(matroska->ctx, AV_LOG_INFO,
1740
                                               "Unknown entry 0x%x in "
1741
                                               "CuesTrackPositions\n", id);
1742
                                        /* fall-through */
1743

    
1744
                                    case EBML_ID_VOID:
1745
                                        res = ebml_read_skip(matroska);
1746
                                        break;
1747
                                }
1748

    
1749
                                if (matroska->level_up) {
1750
                                    matroska->level_up--;
1751
                                    break;
1752
                                }
1753
                            }
1754

    
1755
                            break;
1756

    
1757
                        default:
1758
                            av_log(matroska->ctx, AV_LOG_INFO,
1759
                                   "Unknown entry 0x%x in cuespoint "
1760
                                   "index\n", id);
1761
                            /* fall-through */
1762

    
1763
                        case EBML_ID_VOID:
1764
                            res = ebml_read_skip(matroska);
1765
                            break;
1766
                    }
1767

    
1768
                    if (matroska->level_up) {
1769
                        matroska->level_up--;
1770
                        break;
1771
                    }
1772
                }
1773

    
1774
                /* so let's see if we got what we wanted */
1775
                if (idx.pos   != (uint64_t) -1 &&
1776
                    idx.time  != (uint64_t) -1 &&
1777
                    idx.track != (uint16_t) -1) {
1778
                    if (matroska->num_indexes % 32 == 0) {
1779
                        /* re-allocate bigger index */
1780
                        matroska->index =
1781
                            av_realloc(matroska->index,
1782
                                       (matroska->num_indexes + 32) *
1783
                                       sizeof(MatroskaDemuxIndex));
1784
                    }
1785
                    matroska->index[matroska->num_indexes] = idx;
1786
                    matroska->num_indexes++;
1787
                }
1788
                break;
1789

    
1790
            default:
1791
                av_log(matroska->ctx, AV_LOG_INFO,
1792
                       "Unknown entry 0x%x in cues header\n", id);
1793
                /* fall-through */
1794

    
1795
            case EBML_ID_VOID:
1796
                res = ebml_read_skip(matroska);
1797
                break;
1798
        }
1799

    
1800
        if (matroska->level_up) {
1801
            matroska->level_up--;
1802
            break;
1803
        }
1804
    }
1805

    
1806
    return res;
1807
}
1808

    
1809
static int
1810
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1811
{
1812
    int res = 0;
1813
    uint32_t id;
1814

    
1815
    while (res == 0) {
1816
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1817
            res = AVERROR_IO;
1818
            break;
1819
        } else if (matroska->level_up) {
1820
            matroska->level_up--;
1821
            break;
1822
        }
1823

    
1824
        switch (id) {
1825
            /* Hm, this is unsupported... */
1826
            default:
1827
                av_log(matroska->ctx, AV_LOG_INFO,
1828
                       "Unknown entry 0x%x in metadata header\n", id);
1829
                /* fall-through */
1830

    
1831
            case EBML_ID_VOID:
1832
                res = ebml_read_skip(matroska);
1833
                break;
1834
        }
1835

    
1836
        if (matroska->level_up) {
1837
            matroska->level_up--;
1838
            break;
1839
        }
1840
    }
1841

    
1842
    return res;
1843
}
1844

    
1845
static int
1846
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1847
{
1848
    int res = 0;
1849
    uint32_t id;
1850

    
1851
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1852

    
1853
    while (res == 0) {
1854
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1855
            res = AVERROR_IO;
1856
            break;
1857
        } else if (matroska->level_up) {
1858
            matroska->level_up--;
1859
            break;
1860
        }
1861

    
1862
        switch (id) {
1863
            case MATROSKA_ID_SEEKENTRY: {
1864
                uint32_t seek_id = 0, peek_id_cache = 0;
1865
                uint64_t seek_pos = (uint64_t) -1, t;
1866

    
1867
                if ((res = ebml_read_master(matroska, &id)) < 0)
1868
                    break;
1869

    
1870
                while (res == 0) {
1871
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1872
                        res = AVERROR_IO;
1873
                        break;
1874
                    } else if (matroska->level_up) {
1875
                        matroska->level_up--;
1876
                        break;
1877
                    }
1878

    
1879
                    switch (id) {
1880
                        case MATROSKA_ID_SEEKID:
1881
                            res = ebml_read_uint(matroska, &id, &t);
1882
                            seek_id = t;
1883
                            break;
1884

    
1885
                        case MATROSKA_ID_SEEKPOSITION:
1886
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1887
                            break;
1888

    
1889
                        default:
1890
                            av_log(matroska->ctx, AV_LOG_INFO,
1891
                                   "Unknown seekhead ID 0x%x\n", id);
1892
                            /* fall-through */
1893

    
1894
                        case EBML_ID_VOID:
1895
                            res = ebml_read_skip(matroska);
1896
                            break;
1897
                    }
1898

    
1899
                    if (matroska->level_up) {
1900
                        matroska->level_up--;
1901
                        break;
1902
                    }
1903
                }
1904

    
1905
                if (!seek_id || seek_pos == (uint64_t) -1) {
1906
                    av_log(matroska->ctx, AV_LOG_INFO,
1907
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1908
                           seek_id, seek_pos);
1909
                    break;
1910
                }
1911

    
1912
                switch (seek_id) {
1913
                    case MATROSKA_ID_CUES:
1914
                    case MATROSKA_ID_TAGS: {
1915
                        uint32_t level_up = matroska->level_up;
1916
                        offset_t before_pos;
1917
                        uint64_t length;
1918
                        MatroskaLevel level;
1919

    
1920
                        /* remember the peeked ID and the current position */
1921
                        peek_id_cache = matroska->peek_id;
1922
                        before_pos = url_ftell(&matroska->ctx->pb);
1923

    
1924
                        /* seek */
1925
                        if ((res = ebml_read_seek(matroska, seek_pos +
1926
                                               matroska->segment_start)) < 0)
1927
                            return res;
1928

    
1929
                        /* we don't want to lose our seekhead level, so we add
1930
                         * a dummy. This is a crude hack. */
1931
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1932
                            av_log(matroska->ctx, AV_LOG_INFO,
1933
                                   "Max EBML element depth (%d) reached, "
1934
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1935
                            return AVERROR_UNKNOWN;
1936
                        }
1937

    
1938
                        level.start = 0;
1939
                        level.length = (uint64_t)-1;
1940
                        matroska->levels[matroska->num_levels] = level;
1941
                        matroska->num_levels++;
1942

    
1943
                        /* check ID */
1944
                        if (!(id = ebml_peek_id (matroska,
1945
                                                 &matroska->level_up)))
1946
                            goto finish;
1947
                        if (id != seek_id) {
1948
                            av_log(matroska->ctx, AV_LOG_INFO,
1949
                                   "We looked for ID=0x%x but got "
1950
                                   "ID=0x%x (pos=%"PRIu64")",
1951
                                   seek_id, id, seek_pos +
1952
                                   matroska->segment_start);
1953
                            goto finish;
1954
                        }
1955

    
1956
                        /* read master + parse */
1957
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1958
                            goto finish;
1959
                        switch (id) {
1960
                            case MATROSKA_ID_CUES:
1961
                                if (!(res = matroska_parse_index(matroska)) ||
1962
                                    url_feof(&matroska->ctx->pb)) {
1963
                                    matroska->index_parsed = 1;
1964
                                    res = 0;
1965
                                }
1966
                                break;
1967
                            case MATROSKA_ID_TAGS:
1968
                                if (!(res = matroska_parse_metadata(matroska)) ||
1969
                                   url_feof(&matroska->ctx->pb)) {
1970
                                    matroska->metadata_parsed = 1;
1971
                                    res = 0;
1972
                                }
1973
                                break;
1974
                        }
1975

    
1976
                    finish:
1977
                        /* remove dummy level */
1978
                        while (matroska->num_levels) {
1979
                            matroska->num_levels--;
1980
                            length =
1981
                                matroska->levels[matroska->num_levels].length;
1982
                            if (length == (uint64_t)-1)
1983
                                break;
1984
                        }
1985

    
1986
                        /* seek back */
1987
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1988
                            return res;
1989
                        matroska->peek_id = peek_id_cache;
1990
                        matroska->level_up = level_up;
1991
                        break;
1992
                    }
1993

    
1994
                    default:
1995
                        av_log(matroska->ctx, AV_LOG_INFO,
1996
                               "Ignoring seekhead entry for ID=0x%x\n",
1997
                               seek_id);
1998
                        break;
1999
                }
2000

    
2001
                break;
2002
            }
2003

    
2004
            default:
2005
                av_log(matroska->ctx, AV_LOG_INFO,
2006
                       "Unknown seekhead ID 0x%x\n", id);
2007
                /* fall-through */
2008

    
2009
            case EBML_ID_VOID:
2010
                res = ebml_read_skip(matroska);
2011
                break;
2012
        }
2013

    
2014
        if (matroska->level_up) {
2015
            matroska->level_up--;
2016
            break;
2017
        }
2018
    }
2019

    
2020
    return res;
2021
}
2022

    
2023
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2024

    
2025
static int
2026
matroska_aac_profile (char *codec_id)
2027
{
2028
    static const char *aac_profiles[] = {
2029
        "MAIN", "LC", "SSR"
2030
    };
2031
    int profile;
2032

    
2033
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2034
        if (strstr(codec_id, aac_profiles[profile]))
2035
            break;
2036
    return profile + 1;
2037
}
2038

    
2039
static int
2040
matroska_aac_sri (int samplerate)
2041
{
2042
    static const int aac_sample_rates[] = {
2043
        96000, 88200, 64000, 48000, 44100, 32000,
2044
        24000, 22050, 16000, 12000, 11025,  8000,
2045
    };
2046
    int sri;
2047

    
2048
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2049
        if (aac_sample_rates[sri] == samplerate)
2050
            break;
2051
    return sri;
2052
}
2053

    
2054
static int
2055
matroska_read_header (AVFormatContext    *s,
2056
                      AVFormatParameters *ap)
2057
{
2058
    MatroskaDemuxContext *matroska = s->priv_data;
2059
    char *doctype;
2060
    int version, last_level, res = 0;
2061
    uint32_t id;
2062

    
2063
    matroska->ctx = s;
2064

    
2065
    /* First read the EBML header. */
2066
    doctype = NULL;
2067
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2068
        return res;
2069
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2070
        av_log(matroska->ctx, AV_LOG_ERROR,
2071
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2072
               doctype ? doctype : "(none)");
2073
        if (doctype)
2074
            av_free(doctype);
2075
        return AVERROR_NOFMT;
2076
    }
2077
    av_free(doctype);
2078
    if (version != 1) {
2079
        av_log(matroska->ctx, AV_LOG_ERROR,
2080
               "Matroska demuxer version 1 too old for file version %d\n",
2081
               version);
2082
        return AVERROR_NOFMT;
2083
    }
2084

    
2085
    /* The next thing is a segment. */
2086
    while (1) {
2087
        if (!(id = ebml_peek_id(matroska, &last_level)))
2088
            return AVERROR_IO;
2089
        if (id == MATROSKA_ID_SEGMENT)
2090
            break;
2091

    
2092
        /* oi! */
2093
        av_log(matroska->ctx, AV_LOG_INFO,
2094
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2095
               MATROSKA_ID_SEGMENT, id);
2096
        if ((res = ebml_read_skip(matroska)) < 0)
2097
            return res;
2098
    }
2099

    
2100
    /* We now have a Matroska segment.
2101
     * Seeks are from the beginning of the segment,
2102
     * after the segment ID/length. */
2103
    if ((res = ebml_read_master(matroska, &id)) < 0)
2104
        return res;
2105
    matroska->segment_start = url_ftell(&s->pb);
2106

    
2107
    matroska->time_scale = 1000000;
2108
    /* we've found our segment, start reading the different contents in here */
2109
    while (res == 0) {
2110
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2111
            res = AVERROR_IO;
2112
            break;
2113
        } else if (matroska->level_up) {
2114
            matroska->level_up--;
2115
            break;
2116
        }
2117

    
2118
        switch (id) {
2119
            /* stream info */
2120
            case MATROSKA_ID_INFO: {
2121
                if ((res = ebml_read_master(matroska, &id)) < 0)
2122
                    break;
2123
                res = matroska_parse_info(matroska);
2124
                break;
2125
            }
2126

    
2127
            /* track info headers */
2128
            case MATROSKA_ID_TRACKS: {
2129
                if ((res = ebml_read_master(matroska, &id)) < 0)
2130
                    break;
2131
                res = matroska_parse_tracks(matroska);
2132
                break;
2133
            }
2134

    
2135
            /* stream index */
2136
            case MATROSKA_ID_CUES: {
2137
                if (!matroska->index_parsed) {
2138
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2139
                        break;
2140
                    res = matroska_parse_index(matroska);
2141
                } else
2142
                    res = ebml_read_skip(matroska);
2143
                break;
2144
            }
2145

    
2146
            /* metadata */
2147
            case MATROSKA_ID_TAGS: {
2148
                if (!matroska->metadata_parsed) {
2149
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2150
                        break;
2151
                    res = matroska_parse_metadata(matroska);
2152
                } else
2153
                    res = ebml_read_skip(matroska);
2154
                break;
2155
            }
2156

    
2157
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2158
            case MATROSKA_ID_SEEKHEAD: {
2159
                if ((res = ebml_read_master(matroska, &id)) < 0)
2160
                    break;
2161
                res = matroska_parse_seekhead(matroska);
2162
                break;
2163
            }
2164

    
2165
            case MATROSKA_ID_CLUSTER: {
2166
                /* Do not read the master - this will be done in the next
2167
                 * call to matroska_read_packet. */
2168
                res = 1;
2169
                break;
2170
            }
2171

    
2172
            default:
2173
                av_log(matroska->ctx, AV_LOG_INFO,
2174
                       "Unknown matroska file header ID 0x%x\n", id);
2175
            /* fall-through */
2176

    
2177
            case EBML_ID_VOID:
2178
                res = ebml_read_skip(matroska);
2179
                break;
2180
        }
2181

    
2182
        if (matroska->level_up) {
2183
            matroska->level_up--;
2184
            break;
2185
        }
2186
    }
2187

    
2188
    /* Have we found a cluster? */
2189
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2190
        int i, j;
2191
        MatroskaTrack *track;
2192
        AVStream *st;
2193

    
2194
        for (i = 0; i < matroska->num_tracks; i++) {
2195
            enum CodecID codec_id = CODEC_ID_NONE;
2196
            uint8_t *extradata = NULL;
2197
            int extradata_size = 0;
2198
            int extradata_offset = 0;
2199
            track = matroska->tracks[i];
2200

    
2201
            /* libavformat does not really support subtitles.
2202
             * Also apply some sanity checks. */
2203
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2204
                (track->codec_id == NULL))
2205
                continue;
2206

    
2207
            for(j=0; codec_tags[j].str; j++){
2208
                if(!strncmp(codec_tags[j].str, track->codec_id,
2209
                            strlen(codec_tags[j].str))){
2210
                    codec_id= codec_tags[j].id;
2211
                    break;
2212
                }
2213
            }
2214

    
2215
            /* Set the FourCC from the CodecID. */
2216
            /* This is the MS compatibility mode which stores a
2217
             * BITMAPINFOHEADER in the CodecPrivate. */
2218
            if (!strcmp(track->codec_id,
2219
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2220
                (track->codec_priv_size >= 40) &&
2221
                (track->codec_priv != NULL)) {
2222
                unsigned char *p;
2223

    
2224
                /* Offset of biCompression. Stored in LE. */
2225
                p = (unsigned char *)track->codec_priv + 16;
2226
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2227
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2228
                codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2229

    
2230
            }
2231

    
2232
            /* This is the MS compatibility mode which stores a
2233
             * WAVEFORMATEX in the CodecPrivate. */
2234
            else if (!strcmp(track->codec_id,
2235
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2236
                (track->codec_priv_size >= 18) &&
2237
                (track->codec_priv != NULL)) {
2238
                unsigned char *p;
2239
                uint16_t tag;
2240

    
2241
                /* Offset of wFormatTag. Stored in LE. */
2242
                p = (unsigned char *)track->codec_priv;
2243
                tag = (p[1] << 8) | p[0];
2244
                codec_id = codec_get_wav_id(tag);
2245

    
2246
            }
2247

    
2248
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
2249
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2250
                int profile = matroska_aac_profile(track->codec_id);
2251
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2252
                extradata = av_malloc(5);
2253
                if (extradata == NULL)
2254
                    return AVERROR_NOMEM;
2255
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2256
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2257
                if (strstr(track->codec_id, "SBR")) {
2258
                    sri = matroska_aac_sri(audiotrack->samplerate);
2259
                    extradata[2] = 0x56;
2260
                    extradata[3] = 0xE5;
2261
                    extradata[4] = 0x80 | (sri<<3);
2262
                    extradata_size = 5;
2263
                } else {
2264
                    extradata_size = 2;
2265
                }
2266
            }
2267

    
2268
            else if (codec_id == CODEC_ID_TTA) {
2269
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2270
                ByteIOContext b;
2271
                extradata_size = 30;
2272
                extradata = av_mallocz(extradata_size);
2273
                if (extradata == NULL)
2274
                    return AVERROR_NOMEM;
2275
                init_put_byte(&b, extradata, extradata_size, 1,
2276
                              NULL, NULL, NULL, NULL);
2277
                put_buffer(&b, (uint8_t *) "TTA1", 4);
2278
                put_le16(&b, 1);
2279
                put_le16(&b, audiotrack->channels);
2280
                put_le16(&b, audiotrack->bitdepth);
2281
                put_le32(&b, audiotrack->samplerate);
2282
                put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
2283
            }
2284

    
2285
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
2286
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
2287
                extradata_offset = 26;
2288
                track->codec_priv_size -= extradata_offset;
2289
                track->flags |= MATROSKA_TRACK_REAL_V;
2290
            }
2291

    
2292
            if (codec_id == CODEC_ID_NONE) {
2293
                av_log(matroska->ctx, AV_LOG_INFO,
2294
                       "Unknown/unsupported CodecID %s.\n",
2295
                       track->codec_id);
2296
            }
2297

    
2298
            track->stream_index = matroska->num_streams;
2299

    
2300
            matroska->num_streams++;
2301
            st = av_new_stream(s, track->stream_index);
2302
            if (st == NULL)
2303
                return AVERROR_NOMEM;
2304
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2305

    
2306
            st->codec->codec_id = codec_id;
2307

    
2308
            if (track->default_duration)
2309
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2310
                          track->default_duration, 1000000000, 30000);
2311

    
2312
            if(extradata){
2313
                st->codec->extradata = extradata;
2314
                st->codec->extradata_size = extradata_size;
2315
            } else if(track->codec_priv && track->codec_priv_size > 0){
2316
                st->codec->extradata = av_malloc(track->codec_priv_size);
2317
                if(st->codec->extradata == NULL)
2318
                    return AVERROR_NOMEM;
2319
                st->codec->extradata_size = track->codec_priv_size;
2320
                memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
2321
                       track->codec_priv_size);
2322
            }
2323

    
2324
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2325
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2326

    
2327
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2328
                st->codec->codec_tag = videotrack->fourcc;
2329
                st->codec->width = videotrack->pixel_width;
2330
                st->codec->height = videotrack->pixel_height;
2331
                if (videotrack->display_width == 0)
2332
                    videotrack->display_width= videotrack->pixel_width;
2333
                if (videotrack->display_height == 0)
2334
                    videotrack->display_height= videotrack->pixel_height;
2335
                av_reduce(&st->codec->sample_aspect_ratio.num,
2336
                          &st->codec->sample_aspect_ratio.den,
2337
                          st->codec->height * videotrack->display_width,
2338
                          st->codec-> width * videotrack->display_height,
2339
                          255);
2340
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2341
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2342

    
2343
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2344
                st->codec->sample_rate = audiotrack->samplerate;
2345
                st->codec->channels = audiotrack->channels;
2346
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2347
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2348
            }
2349

    
2350
            /* What do we do with private data? E.g. for Vorbis. */
2351
        }
2352
        res = 0;
2353
    }
2354

    
2355
    return res;
2356
}
2357

    
2358
static int
2359
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2360
                            int                   num)
2361
{
2362
    int i;
2363

    
2364
    for (i = 0; i < matroska->num_tracks; i++)
2365
        if (matroska->tracks[i]->num == num)
2366
            return i;
2367

    
2368
    return -1;
2369
}
2370

    
2371
static inline int
2372
rv_offset(uint8_t *data, int slice, int slices)
2373
{
2374
    return LE_32(data+8*slice+4) + 8*slices;
2375
}
2376

    
2377
static int
2378
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2379
                           uint64_t              cluster_time)
2380
{
2381
    int res = 0;
2382
    uint32_t id;
2383
    AVPacket *pkt = NULL;
2384
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2385
    uint64_t duration = AV_NOPTS_VALUE;
2386
    int track = -1;
2387

    
2388
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2389

    
2390
    while (res == 0) {
2391
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2392
            res = AVERROR_IO;
2393
            break;
2394
        } else if (matroska->level_up) {
2395
            matroska->level_up--;
2396
            break;
2397
        }
2398

    
2399
        switch (id) {
2400
            /* one block inside the group. Note, block parsing is one
2401
             * of the harder things, so this code is a bit complicated.
2402
             * See http://www.matroska.org/ for documentation. */
2403
            case MATROSKA_ID_BLOCK: {
2404
                uint8_t *data, *origdata;
2405
                int size;
2406
                int16_t block_time;
2407
                uint32_t *lace_size = NULL;
2408
                int n, flags, laces = 0;
2409
                uint64_t num;
2410
                int64_t pos= url_ftell(&matroska->ctx->pb);
2411

    
2412
                if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2413
                    break;
2414
                origdata = data;
2415

    
2416
                /* first byte(s): tracknum */
2417
                if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2418
                    av_log(matroska->ctx, AV_LOG_ERROR,
2419
                           "EBML block data error\n");
2420
                    av_free(origdata);
2421
                    break;
2422
                }
2423
                data += n;
2424
                size -= n;
2425

    
2426
                /* fetch track from num */
2427
                track = matroska_find_track_by_num(matroska, num);
2428
                if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2429
                    av_log(matroska->ctx, AV_LOG_INFO,
2430
                           "Invalid stream %d or size %u\n", track, size);
2431
                    av_free(origdata);
2432
                    break;
2433
                }
2434
                if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2435
                    av_free(origdata);
2436
                    break;
2437
                }
2438

    
2439
                /* block_time (relative to cluster time) */
2440
                block_time = (data[0] << 8) | data[1];
2441
                data += 2;
2442
                size -= 2;
2443
                flags = *data;
2444
                data += 1;
2445
                size -= 1;
2446
                switch ((flags & 0x06) >> 1) {
2447
                    case 0x0: /* no lacing */
2448
                        laces = 1;
2449
                        lace_size = av_mallocz(sizeof(int));
2450
                        lace_size[0] = size;
2451
                        break;
2452

    
2453
                    case 0x1: /* xiph lacing */
2454
                    case 0x2: /* fixed-size lacing */
2455
                    case 0x3: /* EBML lacing */
2456
                        if (size == 0) {
2457
                            res = -1;
2458
                            break;
2459
                        }
2460
                        laces = (*data) + 1;
2461
                        data += 1;
2462
                        size -= 1;
2463
                        lace_size = av_mallocz(laces * sizeof(int));
2464

    
2465
                        switch ((flags & 0x06) >> 1) {
2466
                            case 0x1: /* xiph lacing */ {
2467
                                uint8_t temp;
2468
                                uint32_t total = 0;
2469
                                for (n = 0; res == 0 && n < laces - 1; n++) {
2470
                                    while (1) {
2471
                                        if (size == 0) {
2472
                                            res = -1;
2473
                                            break;
2474
                                        }
2475
                                        temp = *data;
2476
                                        lace_size[n] += temp;
2477
                                        data += 1;
2478
                                        size -= 1;
2479
                                        if (temp != 0xff)
2480
                                            break;
2481
                                    }
2482
                                    total += lace_size[n];
2483
                                }
2484
                                lace_size[n] = size - total;
2485
                                break;
2486
                            }
2487

    
2488
                            case 0x2: /* fixed-size lacing */
2489
                                for (n = 0; n < laces; n++)
2490
                                    lace_size[n] = size / laces;
2491
                                break;
2492

    
2493
                            case 0x3: /* EBML lacing */ {
2494
                                uint32_t total;
2495
                                n = matroska_ebmlnum_uint(data, size, &num);
2496
                                if (n < 0) {
2497
                                    av_log(matroska->ctx, AV_LOG_INFO,
2498
                                           "EBML block data error\n");
2499
                                    break;
2500
                                }
2501
                                data += n;
2502
                                size -= n;
2503
                                total = lace_size[0] = num;
2504
                                for (n = 1; res == 0 && n < laces - 1; n++) {
2505
                                    int64_t snum;
2506
                                    int r;
2507
                                    r = matroska_ebmlnum_sint (data, size,
2508
                                                               &snum);
2509
                                    if (r < 0) {
2510
                                        av_log(matroska->ctx, AV_LOG_INFO,
2511
                                               "EBML block data error\n");
2512
                                        break;
2513
                                    }
2514
                                    data += r;
2515
                                    size -= r;
2516
                                    lace_size[n] = lace_size[n - 1] + snum;
2517
                                    total += lace_size[n];
2518
                                }
2519
                                lace_size[n] = size - total;
2520
                                break;
2521
                            }
2522
                        }
2523
                        break;
2524
                }
2525

    
2526
                if (res == 0) {
2527
                    int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
2528
                    for (n = 0; n < laces; n++) {
2529
                        uint64_t timecode = AV_NOPTS_VALUE;
2530
                        int slice, slices = 1;
2531

    
2532
                        if (real_v) {
2533
                            slices = *data++ + 1;
2534
                            lace_size[n]--;
2535
                        }
2536
                        if (cluster_time != (uint64_t)-1 && n == 0) {
2537
                            if (cluster_time + block_time >= 0)
2538
                                timecode = cluster_time + block_time;
2539
                        }
2540
                        /* FIXME: duration */
2541

    
2542
                        for (slice=0; slice<slices; slice++) {
2543
                            int slice_size, slice_offset = 0;
2544
                            if (real_v)
2545
                                slice_offset = rv_offset(data, slice, slices);
2546
                            if (slice+1 == slices)
2547
                                slice_size = lace_size[n] - slice_offset;
2548
                            else
2549
                                slice_size = rv_offset(data, slice+1, slices) - slice_offset;
2550
                            pkt = av_mallocz(sizeof(AVPacket));
2551
                            /* XXX: prevent data copy... */
2552
                            if (av_new_packet(pkt, slice_size) < 0) {
2553
                                res = AVERROR_NOMEM;
2554
                                n = laces-1;
2555
                                break;
2556
                            }
2557
                            memcpy (pkt->data, data+slice_offset, slice_size);
2558

    
2559
                            if (n == 0)
2560
                                pkt->flags = is_keyframe;
2561
                            pkt->stream_index =
2562
                                matroska->tracks[track]->stream_index;
2563

    
2564
                            pkt->pts = timecode;
2565
                            pkt->pos = pos;
2566

    
2567
                            matroska_queue_packet(matroska, pkt);
2568
                        }
2569
                        data += lace_size[n];
2570
                    }
2571
                }
2572

    
2573
                av_free(lace_size);
2574
                av_free(origdata);
2575
                break;
2576
            }
2577

    
2578
            case MATROSKA_ID_BLOCKDURATION: {
2579
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2580
                    break;
2581
                break;
2582
            }
2583

    
2584
            case MATROSKA_ID_BLOCKREFERENCE:
2585
                /* We've found a reference, so not even the first frame in
2586
                 * the lace is a key frame. */
2587
                is_keyframe = 0;
2588
                if (last_num_packets != matroska->num_packets)
2589
                    matroska->packets[last_num_packets]->flags = 0;
2590
                res = ebml_read_skip(matroska);
2591
                break;
2592

    
2593
            default:
2594
                av_log(matroska->ctx, AV_LOG_INFO,
2595
                       "Unknown entry 0x%x in blockgroup data\n", id);
2596
                /* fall-through */
2597

    
2598
            case EBML_ID_VOID:
2599
                res = ebml_read_skip(matroska);
2600
                break;
2601
        }
2602

    
2603
        if (matroska->level_up) {
2604
            matroska->level_up--;
2605
            break;
2606
        }
2607
    }
2608

    
2609
    if (pkt)
2610
    {
2611
        if (duration != AV_NOPTS_VALUE)
2612
            pkt->duration = duration;
2613
        else if (track >= 0 && track < matroska->num_tracks)
2614
            pkt->duration = matroska->tracks[track]->default_duration / matroska->time_scale;
2615
    }
2616

    
2617
    return res;
2618
}
2619

    
2620
static int
2621
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2622
{
2623
    int res = 0;
2624
    uint32_t id;
2625
    uint64_t cluster_time = 0;
2626

    
2627
    av_log(matroska->ctx, AV_LOG_DEBUG,
2628
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2629

    
2630
    while (res == 0) {
2631
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2632
            res = AVERROR_IO;
2633
            break;
2634
        } else if (matroska->level_up) {
2635
            matroska->level_up--;
2636
            break;
2637
        }
2638

    
2639
        switch (id) {
2640
            /* cluster timecode */
2641
            case MATROSKA_ID_CLUSTERTIMECODE: {
2642
                uint64_t num;
2643
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2644
                    break;
2645
                cluster_time = num;
2646
                break;
2647
            }
2648

    
2649
                /* a group of blocks inside a cluster */
2650
            case MATROSKA_ID_BLOCKGROUP:
2651
                if ((res = ebml_read_master(matroska, &id)) < 0)
2652
                    break;
2653
                res = matroska_parse_blockgroup(matroska, cluster_time);
2654
                break;
2655

    
2656
            default:
2657
                av_log(matroska->ctx, AV_LOG_INFO,
2658
                       "Unknown entry 0x%x in cluster data\n", id);
2659
                /* fall-through */
2660

    
2661
            case EBML_ID_VOID:
2662
                res = ebml_read_skip(matroska);
2663
                break;
2664
        }
2665

    
2666
        if (matroska->level_up) {
2667
            matroska->level_up--;
2668
            break;
2669
        }
2670
    }
2671

    
2672
    return res;
2673
}
2674

    
2675
static int
2676
matroska_read_packet (AVFormatContext *s,
2677
                      AVPacket        *pkt)
2678
{
2679
    MatroskaDemuxContext *matroska = s->priv_data;
2680
    int res = 0;
2681
    uint32_t id;
2682

    
2683
    /* Do we still have a packet queued? */
2684
    if (matroska_deliver_packet(matroska, pkt) == 0)
2685
        return 0;
2686

    
2687
    /* Have we already reached the end? */
2688
    if (matroska->done)
2689
        return AVERROR_IO;
2690

    
2691
    while (res == 0) {
2692
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2693
            res = AVERROR_IO;
2694
            break;
2695
        } else if (matroska->level_up) {
2696
            matroska->level_up--;
2697
            break;
2698
        }
2699

    
2700
        switch (id) {
2701
            case MATROSKA_ID_CLUSTER:
2702
                if ((res = ebml_read_master(matroska, &id)) < 0)
2703
                    break;
2704
                if ((res = matroska_parse_cluster(matroska)) == 0)
2705
                    res = 1; /* Parsed one cluster, let's get out. */
2706
                break;
2707

    
2708
            default:
2709
            case EBML_ID_VOID:
2710
                res = ebml_read_skip(matroska);
2711
                break;
2712
        }
2713

    
2714
        if (matroska->level_up) {
2715
            matroska->level_up--;
2716
            break;
2717
        }
2718
    }
2719

    
2720
    if (res == -1)
2721
        matroska->done = 1;
2722

    
2723
    return matroska_deliver_packet(matroska, pkt);
2724
}
2725

    
2726
static int
2727
matroska_read_close (AVFormatContext *s)
2728
{
2729
    MatroskaDemuxContext *matroska = s->priv_data;
2730
    int n = 0;
2731

    
2732
    av_free(matroska->writing_app);
2733
    av_free(matroska->muxing_app);
2734
    av_free(matroska->index);
2735

    
2736
    if (matroska->packets != NULL) {
2737
        for (n = 0; n < matroska->num_packets; n++) {
2738
            av_free_packet(matroska->packets[n]);
2739
            av_free(matroska->packets[n]);
2740
        }
2741
        av_free(matroska->packets);
2742
    }
2743

    
2744
    for (n = 0; n < matroska->num_tracks; n++) {
2745
        MatroskaTrack *track = matroska->tracks[n];
2746
        av_free(track->codec_id);
2747
        av_free(track->codec_name);
2748
        av_free(track->codec_priv);
2749
        av_free(track->name);
2750
        av_free(track->language);
2751

    
2752
        av_free(track);
2753
    }
2754

    
2755
    return 0;
2756
}
2757

    
2758
AVInputFormat matroska_demuxer = {
2759
    "matroska",
2760
    "Matroska file format",
2761
    sizeof(MatroskaDemuxContext),
2762
    matroska_probe,
2763
    matroska_read_header,
2764
    matroska_read_packet,
2765
    matroska_read_close,
2766
};