Statistics
| Branch: | Revision:

ffmpeg / libavformat / matroska.c @ 649b918c

History | View | Annotate | Download (87.9 KB)

1
/*
2
 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 The ffmpeg Project
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19

    
20
/**
21
 * @file matroska.c
22
 * Matroska file demuxer
23
 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
24
 * with a little help from Moritz Bunkus <moritz@bunkus.org>
25
 * Specs available on the matroska project page:
26
 * http://www.matroska.org/.
27
 */
28

    
29
#include "avformat.h"
30
/* For codec_get_bmp_id and codec_get_wav_id. */
31
#include "avi.h"
32

    
33
/* EBML version supported */
34
#define EBML_VERSION 1
35

    
36
/* top-level master-IDs */
37
#define EBML_ID_HEADER             0x1A45DFA3
38

    
39
/* IDs in the HEADER master */
40
#define EBML_ID_EBMLVERSION        0x4286
41
#define EBML_ID_EBMLREADVERSION    0x42F7
42
#define EBML_ID_EBMLMAXIDLENGTH    0x42F2
43
#define EBML_ID_EBMLMAXSIZELENGTH  0x42F3
44
#define EBML_ID_DOCTYPE            0x4282
45
#define EBML_ID_DOCTYPEVERSION     0x4287
46
#define EBML_ID_DOCTYPEREADVERSION 0x4285
47

    
48
/* general EBML types */
49
#define EBML_ID_VOID               0xEC
50

    
51
/*
52
 * Matroska element IDs. max. 32-bit.
53
 */
54

    
55
/* toplevel segment */
56
#define MATROSKA_ID_SEGMENT    0x18538067
57

    
58
/* matroska top-level master IDs */
59
#define MATROSKA_ID_INFO       0x1549A966
60
#define MATROSKA_ID_TRACKS     0x1654AE6B
61
#define MATROSKA_ID_CUES       0x1C53BB6B
62
#define MATROSKA_ID_TAGS       0x1254C367
63
#define MATROSKA_ID_SEEKHEAD   0x114D9B74
64
#define MATROSKA_ID_CLUSTER    0x1F43B675
65

    
66
/* IDs in the info master */
67
#define MATROSKA_ID_TIMECODESCALE 0x2AD7B1
68
#define MATROSKA_ID_DURATION   0x4489
69
#define MATROSKA_ID_WRITINGAPP 0x5741
70
#define MATROSKA_ID_MUXINGAPP  0x4D80
71
#define MATROSKA_ID_DATEUTC    0x4461
72

    
73
/* ID in the tracks master */
74
#define MATROSKA_ID_TRACKENTRY 0xAE
75

    
76
/* IDs in the trackentry master */
77
#define MATROSKA_ID_TRACKNUMBER 0xD7
78
#define MATROSKA_ID_TRACKUID   0x73C5
79
#define MATROSKA_ID_TRACKTYPE  0x83
80
#define MATROSKA_ID_TRACKAUDIO 0xE1
81
#define MATROSKA_ID_TRACKVIDEO 0xE0
82
#define MATROSKA_ID_CODECID    0x86
83
#define MATROSKA_ID_CODECPRIVATE 0x63A2
84
#define MATROSKA_ID_CODECNAME  0x258688
85
#define MATROSKA_ID_CODECINFOURL 0x3B4040
86
#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
87
#define MATROSKA_ID_TRACKNAME  0x536E
88
#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
89
#define MATROSKA_ID_TRACKFLAGENABLED 0xB9
90
#define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
91
#define MATROSKA_ID_TRACKFLAGLACING 0x9C
92
#define MATROSKA_ID_TRACKMINCACHE 0x6DE7
93
#define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
94
#define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383
95

    
96
/* IDs in the trackvideo master */
97
#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
98
#define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
99
#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
100
#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
101
#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
102
#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
103
#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
104
#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
105
#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
106

    
107
/* IDs in the trackaudio master */
108
#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
109
#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
110
#define MATROSKA_ID_AUDIOCHANNELS 0x9F
111

    
112
/* ID in the cues master */
113
#define MATROSKA_ID_POINTENTRY 0xBB
114

    
115
/* IDs in the pointentry master */
116
#define MATROSKA_ID_CUETIME    0xB3
117
#define MATROSKA_ID_CUETRACKPOSITION 0xB7
118

    
119
/* IDs in the cuetrackposition master */
120
#define MATROSKA_ID_CUETRACK   0xF7
121
#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
122

    
123
/* IDs in the tags master */
124
/* TODO */
125

    
126
/* IDs in the seekhead master */
127
#define MATROSKA_ID_SEEKENTRY  0x4DBB
128

    
129
/* IDs in the seekpoint master */
130
#define MATROSKA_ID_SEEKID     0x53AB
131
#define MATROSKA_ID_SEEKPOSITION 0x53AC
132

    
133
/* IDs in the cluster master */
134
#define MATROSKA_ID_CLUSTERTIMECODE 0xE7
135
#define MATROSKA_ID_BLOCKGROUP 0xA0
136

    
137
/* IDs in the blockgroup master */
138
#define MATROSKA_ID_BLOCK      0xA1
139
#define MATROSKA_ID_BLOCKDURATION 0x9B
140
#define MATROSKA_ID_BLOCKREFERENCE 0xFB
141

    
142
typedef enum {
143
  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
144
  MATROSKA_TRACK_TYPE_AUDIO    = 0x2,
145
  MATROSKA_TRACK_TYPE_COMPLEX  = 0x3,
146
  MATROSKA_TRACK_TYPE_LOGO     = 0x10,
147
  MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
148
  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
149
} MatroskaTrackType;
150

    
151
typedef enum {
152
  MATROSKA_EYE_MODE_MONO  = 0x0,
153
  MATROSKA_EYE_MODE_RIGHT = 0x1,
154
  MATROSKA_EYE_MODE_LEFT  = 0x2,
155
  MATROSKA_EYE_MODE_BOTH  = 0x3,
156
} MatroskaEyeMode;
157

    
158
typedef enum {
159
  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
160
  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
161
  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
162
} MatroskaAspectRatioMode;
163

    
164
/*
165
 * These aren't in any way "matroska-form" things,
166
 * it's just something I use in the muxer/demuxer.
167
 */
168

    
169
typedef enum {
170
  MATROSKA_TRACK_ENABLED = (1<<0),
171
  MATROSKA_TRACK_DEFAULT = (1<<1),
172
  MATROSKA_TRACK_LACING  = (1<<2),
173
  MATROSKA_TRACK_SHIFT   = (1<<16)
174
} MatroskaTrackFlags;
175

    
176
typedef enum {
177
  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
178
} MatroskaVideoTrackFlags;
179

    
180
/*
181
 * Matroska Codec IDs. Strings.
182
 */
183

    
184
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
185
#define MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED "V_UNCOMPRESSED"
186
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_SP     "V_MPEG4/ISO/SP"
187
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP    "V_MPEG4/ISO/ASP"
188
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AP     "V_MPEG4/ISO/AP"
189
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC    "V_MPEG4/ISO/AVC"
190
#define MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3    "V_MPEG4/MS/V3"
191
#define MATROSKA_CODEC_ID_VIDEO_MPEG1        "V_MPEG1"
192
#define MATROSKA_CODEC_ID_VIDEO_MPEG2        "V_MPEG2"
193
#define MATROSKA_CODEC_ID_VIDEO_MJPEG        "V_MJPEG"
194
/* TODO: Real/Quicktime */
195

    
196
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
197
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L1     "A_MPEG/L1"
198
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2     "A_MPEG/L2"
199
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3     "A_MPEG/L3"
200
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE   "A_PCM/INT/BIG"
201
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE   "A_PCM/INT/LIT"
202
#define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT    "A_PCM/FLOAT/IEEE"
203
#define MATROSKA_CODEC_ID_AUDIO_AC3          "A_AC3"
204
#define MATROSKA_CODEC_ID_AUDIO_DTS          "A_DTS"
205
#define MATROSKA_CODEC_ID_AUDIO_VORBIS       "A_VORBIS"
206
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
207
#define MATROSKA_CODEC_ID_AUDIO_MPEG2        "A_AAC/MPEG2/"
208
#define MATROSKA_CODEC_ID_AUDIO_MPEG4        "A_AAC/MPEG4/"
209
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
210

    
211
/* max. depth in the EBML tree structure */
212
#define EBML_MAX_DEPTH 16
213

    
214
typedef struct Track {
215
    MatroskaTrackType type;
216

    
217
    /* Unique track number and track ID. stream_index is the index that
218
     * the calling app uses for this track. */
219
    uint32_t num,
220
        uid,
221
        stream_index;
222

    
223
    char *name,
224
        *language;
225

    
226
    char *codec_id,
227
        *codec_name;
228

    
229
    unsigned char *codec_priv;
230
    int codec_priv_size;
231

    
232
    int64_t default_duration;
233
    MatroskaTrackFlags flags;
234
} MatroskaTrack;
235

    
236
typedef struct MatroskaVideoTrack {
237
    MatroskaTrack track;
238

    
239
    int pixel_width,
240
        pixel_height,
241
        display_width,
242
        display_height;
243

    
244
    uint32_t fourcc;
245

    
246
    MatroskaAspectRatioMode ar_mode;
247
    MatroskaEyeMode eye_mode;
248

    
249
    //..
250
} MatroskaVideoTrack;
251

    
252
typedef struct MatroskaAudioTrack {
253
    MatroskaTrack track;
254

    
255
    int channels,
256
        bitdepth,
257
        samplerate;
258
    //..
259
} MatroskaAudioTrack;
260

    
261
typedef struct MatroskaSubtitleTrack {
262
    MatroskaTrack track;
263

    
264
    //..
265
} MatroskaSubtitleTrack;
266

    
267
typedef struct MatroskaLevel {
268
    uint64_t start, length;
269
} MatroskaLevel;
270

    
271
typedef struct MatroskaDemuxIndex {
272
  uint64_t        pos;   /* of the corresponding *cluster*! */
273
  uint16_t        track; /* reference to 'num' */
274
  uint64_t        time;  /* in nanoseconds */
275
} MatroskaDemuxIndex;
276

    
277
typedef struct MatroskaDemuxContext {
278
    AVFormatContext *ctx;
279

    
280
    /* ebml stuff */
281
    int num_levels;
282
    MatroskaLevel levels[EBML_MAX_DEPTH];
283
    int level_up;
284

    
285
    /* matroska stuff */
286
    char *writing_app,
287
        *muxing_app;
288
    int64_t created;
289

    
290
    /* timescale in the file */
291
    int64_t time_scale;
292

    
293
    /* length, position (time, ns) */
294
    int64_t duration,
295
        pos;
296

    
297
    /* num_streams is the number of streams that av_new_stream() was called
298
     * for ( = that are available to the calling program). */
299
    int num_tracks, num_streams;
300
    MatroskaTrack *tracks[MAX_STREAMS];
301

    
302
    /* cache for ID peeking */
303
    uint32_t peek_id;
304

    
305
    /* byte position of the segment inside the stream */
306
    offset_t segment_start;
307

    
308
    /* The packet queue. */
309
    AVPacket **packets;
310
    int num_packets;
311

    
312
    /* have we already parse metadata/cues/clusters? */
313
    int metadata_parsed,
314
        index_parsed,
315
        done;
316

    
317
    /* The index for seeking. */
318
    int num_indexes;
319
    MatroskaDemuxIndex *index;
320
} MatroskaDemuxContext;
321

    
322
/*
323
 * The first few functions handle EBML file parsing. The rest
324
 * is the document interpretation. Matroska really just is a
325
 * EBML file.
326
 */
327

    
328
/*
329
 * Return: the amount of levels in the hierarchy that the
330
 * current element lies higher than the previous one.
331
 * The opposite isn't done - that's auto-done using master
332
 * element reading.
333
 */
334

    
335
static int
336
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
337
{
338
    ByteIOContext *pb = &matroska->ctx->pb;
339
    offset_t pos = url_ftell(pb);
340
    int num = 0;
341

    
342
    while (matroska->num_levels > 0) {
343
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
344

    
345
        if (pos >= level->start + level->length) {
346
            matroska->num_levels--;
347
            num++;
348
        } else {
349
            break;
350
        }
351
    }
352

    
353
    return num;
354
}
355

    
356
/*
357
 * Read: an "EBML number", which is defined as a variable-length
358
 * array of bytes. The first byte indicates the length by giving a
359
 * number of 0-bits followed by a one. The position of the first
360
 * "one" bit inside the first byte indicates the length of this
361
 * number.
362
 * Returns: num. of bytes read. < 0 on error.
363
 */
364

    
365
static int
366
ebml_read_num (MatroskaDemuxContext *matroska,
367
               int                   max_size,
368
               uint64_t             *number)
369
{
370
    ByteIOContext *pb = &matroska->ctx->pb;
371
    int len_mask = 0x80, read = 1, n = 1;
372
    int64_t total = 0;
373

    
374
    /* the first byte tells us the length in bytes - get_byte() can normally
375
     * return 0, but since that's not a valid first ebmlID byte, we can
376
     * use it safely here to catch EOS. */
377
    if (!(total = get_byte(pb))) {
378
        /* we might encounter EOS here */
379
        if (!url_feof(pb)) {
380
            offset_t pos = url_ftell(pb);
381
            av_log(matroska->ctx, AV_LOG_ERROR,
382
                   "Read error at pos. %llu (0x%llx)\n",
383
                   pos, pos);
384
        }
385
        return AVERROR_IO; /* EOS or actual I/O error */
386
    }
387

    
388
    /* get the length of the EBML number */
389
    while (read <= max_size && !(total & len_mask)) {
390
        read++;
391
        len_mask >>= 1;
392
    }
393
    if (read > max_size) {
394
        offset_t pos = url_ftell(pb) - 1;
395
        av_log(matroska->ctx, AV_LOG_ERROR,
396
               "Invalid EBML number size tag 0x%02x at pos %llu (0x%llx)\n",
397
               (uint8_t) total, pos, pos);
398
        return AVERROR_INVALIDDATA;
399
    }
400

    
401
    /* read out length */
402
    total &= ~len_mask;
403
    while (n++ < read)
404
        total = (total << 8) | get_byte(pb);
405

    
406
    *number = total;
407

    
408
    return read;
409
}
410

    
411
/*
412
 * Read: the element content data ID.
413
 * Return: the number of bytes read or < 0 on error.
414
 */
415

    
416
static int
417
ebml_read_element_id (MatroskaDemuxContext *matroska,
418
                      uint32_t             *id,
419
                      int                  *level_up)
420
{
421
    int read;
422
    uint64_t total;
423

    
424
    /* if we re-call this, use our cached ID */
425
    if (matroska->peek_id != 0) {
426
        if (level_up)
427
            *level_up = 0;
428
        *id = matroska->peek_id;
429
        return 0;
430
    }
431

    
432
    /* read out the "EBML number", include tag in ID */
433
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
434
        return read;
435
    *id = matroska->peek_id  = total | (1 << (read * 7));
436

    
437
    /* level tracking */
438
    if (level_up)
439
        *level_up = ebml_read_element_level_up(matroska);
440

    
441
    return read;
442
}
443

    
444
/*
445
 * Read: element content length.
446
 * Return: the number of bytes read or < 0 on error.
447
 */
448

    
449
static int
450
ebml_read_element_length (MatroskaDemuxContext *matroska,
451
                          uint64_t             *length)
452
{
453
    /* clear cache since we're now beyond that data point */
454
    matroska->peek_id = 0;
455

    
456
    /* read out the "EBML number", include tag in ID */
457
    return ebml_read_num(matroska, 8, length);
458
}
459

    
460
/*
461
 * Return: the ID of the next element, or 0 on error.
462
 * Level_up contains the amount of levels that this
463
 * next element lies higher than the previous one.
464
 */
465

    
466
static uint32_t
467
ebml_peek_id (MatroskaDemuxContext *matroska,
468
              int                  *level_up)
469
{
470
    uint32_t id;
471

    
472
    assert(level_up != NULL);
473

    
474
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
475
        return 0;
476

    
477
    return id;
478
}
479

    
480
/*
481
 * Seek to a given offset.
482
 * 0 is success, -1 is failure.
483
 */
484

    
485
static int
486
ebml_read_seek (MatroskaDemuxContext *matroska,
487
                offset_t              offset)
488
{
489
    ByteIOContext *pb = &matroska->ctx->pb;
490

    
491
    /* clear ID cache, if any */
492
    matroska->peek_id = 0;
493

    
494
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
495
}
496

    
497
/*
498
 * Skip the next element.
499
 * 0 is success, -1 is failure.
500
 */
501

    
502
static int
503
ebml_read_skip (MatroskaDemuxContext *matroska)
504
{
505
    ByteIOContext *pb = &matroska->ctx->pb;
506
    uint32_t id;
507
    uint64_t length;
508
    int res;
509

    
510
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
511
        (res = ebml_read_element_length(matroska, &length)) < 0)
512
        return res;
513

    
514
    url_fskip(pb, length);
515

    
516
    return 0;
517
}
518

    
519
/*
520
 * Read the next element as an unsigned int.
521
 * 0 is success, < 0 is failure.
522
 */
523

    
524
static int
525
ebml_read_uint (MatroskaDemuxContext *matroska,
526
                uint32_t             *id,
527
                uint64_t             *num)
528
{
529
    ByteIOContext *pb = &matroska->ctx->pb;
530
    int n = 0, size, res;
531
    uint64_t rlength;
532

    
533
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
534
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
535
        return res;
536
    size = rlength;
537
    if (size < 1 || size > 8) {
538
        offset_t pos = url_ftell(pb);
539
        av_log(matroska->ctx, AV_LOG_ERROR,
540
               "Invalid uint element size %d at position %lld (0x%llx)\n",
541
                size, pos, pos);
542
        return AVERROR_INVALIDDATA;
543
    }
544

    
545
    /* big-endian ordening; build up number */
546
    *num = 0;
547
    while (n++ < size)
548
        *num = (*num << 8) | get_byte(pb);
549

    
550
    return 0;
551
}
552

    
553
/*
554
 * Read the next element as a signed int.
555
 * 0 is success, < 0 is failure.
556
 */
557

    
558
static int
559
ebml_read_sint (MatroskaDemuxContext *matroska,
560
                uint32_t             *id,
561
                int64_t              *num)
562
{
563
    ByteIOContext *pb = &matroska->ctx->pb;
564
    int size, n = 1, negative = 0, res;
565
    uint64_t rlength;
566

    
567
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
568
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
569
        return res;
570
    size = rlength;
571
    if (size < 1 || size > 8) {
572
        offset_t pos = url_ftell(pb);
573
        av_log(matroska->ctx, AV_LOG_ERROR,
574
               "Invalid sint element size %d at position %lld (0x%llx)\n",
575
                size, pos, pos);
576
        return AVERROR_INVALIDDATA;
577
    }
578
    if ((*num = get_byte(pb)) & 0x80) {
579
        negative = 1;
580
        *num &= ~0x80;
581
    }
582
    *num = 0;
583
    while (n++ < size)
584
        *num = (*num << 8) | get_byte(pb);
585

    
586
    /* make signed */
587
    if (negative)
588
        *num = *num - (1LL << ((8 * size) - 1));
589

    
590
    return 0;
591
}
592

    
593
/*
594
 * Read the next element as a float.
595
 * 0 is success, < 0 is failure.
596
 */
597

    
598
static int
599
ebml_read_float (MatroskaDemuxContext *matroska,
600
                 uint32_t             *id,
601
                 double               *num)
602
{
603
    ByteIOContext *pb = &matroska->ctx->pb;
604
    int size, res;
605
    uint64_t rlength;
606

    
607
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
608
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
609
        return res;
610
    size = rlength;
611

    
612
    if (size != 4 && size != 8 && size != 10) {
613
        offset_t pos = url_ftell(pb);
614
        av_log(matroska->ctx, AV_LOG_ERROR,
615
               "Invalid float element size %d at position %llu (0x%llx)\n",
616
               size, pos, pos);
617
        return AVERROR_INVALIDDATA;
618
    }
619
    if (size == 10) {
620
        av_log(matroska->ctx, AV_LOG_ERROR,
621
               "FIXME! 10-byte floats unimplemented\n");
622
        return AVERROR_UNKNOWN;
623
    }
624

    
625
    if (size == 4) {
626
        float f;
627

    
628
        while (size-- > 0)
629
#ifdef WORDS_BIGENDIAN
630
            ((uint8_t *) &f)[3 - size] = get_byte(pb);
631
#else
632
            ((uint8_t *) &f)[size] = get_byte(pb);
633
#endif
634

    
635
        *num = f;
636
    } else {
637
        double d;
638

    
639
        while (size-- > 0)
640
#ifdef WORDS_BIGENDIAN
641
            ((uint8_t *) &d)[7 - size] = get_byte(pb);
642
#else
643
            ((uint8_t *) &d)[size] = get_byte(pb);
644
#endif
645

    
646
        *num = d;
647
    }
648

    
649
    return 0;
650
}
651

    
652
/*
653
 * Read the next element as an ASCII string.
654
 * 0 is success, < 0 is failure.
655
 */
656

    
657
static int
658
ebml_read_ascii (MatroskaDemuxContext *matroska,
659
                 uint32_t             *id,
660
                 char                **str)
661
{
662
    ByteIOContext *pb = &matroska->ctx->pb;
663
    int size, res;
664
    uint64_t rlength;
665

    
666
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
667
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
668
        return res;
669
    size = rlength;
670

    
671
    /* ebml strings are usually not 0-terminated, so we allocate one
672
     * byte more, read the string and NULL-terminate it ourselves. */
673
    if (size < 0 || !(*str = av_malloc(size + 1))) {
674
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
675
        return AVERROR_NOMEM;
676
    }
677
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
678
        offset_t pos = url_ftell(pb);
679
        av_log(matroska->ctx, AV_LOG_ERROR,
680
               "Read error at pos. %llu (0x%llx)\n", pos, pos);
681
        return AVERROR_IO;
682
    }
683
    (*str)[size] = '\0';
684

    
685
    return 0;
686
}
687

    
688
/*
689
 * Read the next element as a UTF-8 string.
690
 * 0 is success, < 0 is failure.
691
 */
692

    
693
static int
694
ebml_read_utf8 (MatroskaDemuxContext *matroska,
695
                uint32_t             *id,
696
                char                **str)
697
{
698
  return ebml_read_ascii(matroska, id, str);
699
}
700

    
701
/*
702
 * Read the next element as a date (nanoseconds since 1/1/2000).
703
 * 0 is success, < 0 is failure.
704
 */
705

    
706
static int
707
ebml_read_date (MatroskaDemuxContext *matroska,
708
                uint32_t             *id,
709
                int64_t              *date)
710
{
711
  return ebml_read_sint(matroska, id, date);
712
}
713

    
714
/*
715
 * Read the next element, but only the header. The contents
716
 * are supposed to be sub-elements which can be read separately.
717
 * 0 is success, < 0 is failure.
718
 */
719

    
720
static int
721
ebml_read_master (MatroskaDemuxContext *matroska,
722
                  uint32_t             *id)
723
{
724
    ByteIOContext *pb = &matroska->ctx->pb;
725
    uint64_t length;
726
    MatroskaLevel *level;
727
    int res;
728

    
729
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
730
        (res = ebml_read_element_length(matroska, &length)) < 0)
731
        return res;
732

    
733
    /* protect... (Heaven forbids that the '>' is true) */
734
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
735
        av_log(matroska->ctx, AV_LOG_ERROR,
736
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
737
        return AVERROR_NOTSUPP;
738
    }
739

    
740
    /* remember level */
741
    level = &matroska->levels[matroska->num_levels++];
742
    level->start = url_ftell(pb);
743
    level->length = length;
744

    
745
    return 0;
746
}
747

    
748
/*
749
 * Read the next element as binary data.
750
 * 0 is success, < 0 is failure.
751
 */
752

    
753
static int
754
ebml_read_binary (MatroskaDemuxContext *matroska,
755
                  uint32_t             *id,
756
                  uint8_t             **binary,
757
                  int                  *size)
758
{
759
    ByteIOContext *pb = &matroska->ctx->pb;
760
    uint64_t rlength;
761
    int res;
762

    
763
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
764
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
765
        return res;
766
    *size = rlength;
767

    
768
    if (!(*binary = av_malloc(*size))) {
769
        av_log(matroska->ctx, AV_LOG_ERROR,
770
               "Memory allocation error\n");
771
        return AVERROR_NOMEM;
772
    }
773

    
774
    if (get_buffer(pb, *binary, *size) != *size) {
775
        offset_t pos = url_ftell(pb);
776
        av_log(matroska->ctx, AV_LOG_ERROR,
777
               "Read error at pos. %llu (0x%llx)\n", pos, pos);
778
        return AVERROR_IO;
779
    }
780

    
781
    return 0;
782
}
783

    
784
/*
785
 * Read signed/unsigned "EBML" numbers.
786
 * Return: number of bytes processed, < 0 on error.
787
 * XXX: use ebml_read_num().
788
 */
789

    
790
static int
791
matroska_ebmlnum_uint (uint8_t  *data,
792
                       uint32_t  size,
793
                       uint64_t *num)
794
{
795
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
796
    uint64_t total;
797

    
798
    if (size <= 0)
799
        return AVERROR_INVALIDDATA;
800

    
801
    total = data[0];
802
    while (read <= 8 && !(total & len_mask)) {
803
        read++;
804
        len_mask >>= 1;
805
    }
806
    if (read > 8)
807
        return AVERROR_INVALIDDATA;
808

    
809
    if ((total &= (len_mask - 1)) == len_mask - 1)
810
        num_ffs++;
811
    if (size < read)
812
        return AVERROR_INVALIDDATA;
813
    while (n < read) {
814
        if (data[n] == 0xff)
815
            num_ffs++;
816
        total = (total << 8) | data[n];
817
        n++;
818
    }
819

    
820
    if (!total)
821
        return AVERROR_INVALIDDATA;
822

    
823
    if (read == num_ffs)
824
        *num = (uint64_t)-1;
825
    else
826
        *num = total;
827

    
828
    return read;
829
}
830

    
831
/*
832
 * Same as above, but signed.
833
 */
834

    
835
static int
836
matroska_ebmlnum_sint (uint8_t  *data,
837
                       uint32_t  size,
838
                       int64_t  *num)
839
{
840
    uint64_t unum;
841
    int res;
842

    
843
    /* read as unsigned number first */
844
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
845
        return res;
846

    
847
    /* make signed (weird way) */
848
    if (unum == (uint64_t)-1)
849
        *num = INT64_MAX;
850
    else
851
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
852

    
853
    return res;
854
}
855

    
856
/*
857
 * Read an EBML header.
858
 * 0 is success, < 0 is failure.
859
 */
860

    
861
static int
862
ebml_read_header (MatroskaDemuxContext *matroska,
863
                  char                **doctype,
864
                  int                  *version)
865
{
866
    uint32_t id;
867
    int level_up, res = 0;
868

    
869
    /* default init */
870
    if (doctype)
871
        *doctype = NULL;
872
    if (version)
873
        *version = 1;
874

    
875
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
876
        level_up != 0 || id != EBML_ID_HEADER) {
877
        av_log(matroska->ctx, AV_LOG_ERROR,
878
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
879
        return AVERROR_INVALIDDATA;
880
    }
881
    if ((res = ebml_read_master(matroska, &id)) < 0)
882
        return res;
883

    
884
    while (res == 0) {
885
        if (!(id = ebml_peek_id(matroska, &level_up)))
886
            return AVERROR_IO;
887

    
888
        /* end-of-header */
889
        if (level_up)
890
            break;
891

    
892
        switch (id) {
893
            /* is our read version uptodate? */
894
            case EBML_ID_EBMLREADVERSION: {
895
                uint64_t num;
896

    
897
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
898
                    return res;
899
                if (num > EBML_VERSION) {
900
                    av_log(matroska->ctx, AV_LOG_ERROR,
901
                           "EBML version %llu (> %d) is not supported\n",
902
                           num, EBML_VERSION);
903
                    return AVERROR_INVALIDDATA;
904
                }
905
                break;
906
            }
907

    
908
            /* we only handle 8 byte lengths at max */
909
            case EBML_ID_EBMLMAXSIZELENGTH: {
910
                uint64_t num;
911

    
912
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
913
                    return res;
914
                if (num > sizeof(uint64_t)) {
915
                    av_log(matroska->ctx, AV_LOG_ERROR,
916
                           "Integers of size %llu (> %d) not supported\n",
917
                           num, sizeof(uint64_t));
918
                    return AVERROR_INVALIDDATA;
919
                }
920
                break;
921
            }
922

    
923
            /* we handle 4 byte IDs at max */
924
            case EBML_ID_EBMLMAXIDLENGTH: {
925
                uint64_t num;
926

    
927
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
928
                    return res;
929
                if (num > sizeof(uint32_t)) {
930
                    av_log(matroska->ctx, AV_LOG_ERROR,
931
                           "IDs of size %llu (> %u) not supported\n",
932
                            num, sizeof(uint32_t));
933
                    return AVERROR_INVALIDDATA;
934
                }
935
                break;
936
            }
937

    
938
            case EBML_ID_DOCTYPE: {
939
                char *text;
940

    
941
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
942
                    return res;
943
                if (doctype) {
944
                    if (*doctype)
945
                        av_free(*doctype);
946
                    *doctype = text;
947
                } else
948
                    av_free(text);
949
                break;
950
            }
951

    
952
            case EBML_ID_DOCTYPEREADVERSION: {
953
                uint64_t num;
954

    
955
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
956
                    return res;
957
                if (version)
958
                    *version = num;
959
                break;
960
            }
961

    
962
            default:
963
                av_log(matroska->ctx, AV_LOG_INFO,
964
                       "Unknown data type 0x%x in EBML header", id);
965
                /* pass-through */
966

    
967
            case EBML_ID_VOID:
968
            /* we ignore these two, as they don't tell us anything we
969
             * care about */
970
            case EBML_ID_EBMLVERSION:
971
            case EBML_ID_DOCTYPEVERSION:
972
                res = ebml_read_skip (matroska);
973
                break;
974
        }
975
    }
976

    
977
    return 0;
978
}
979

    
980
/*
981
 * Put one packet in an application-supplied AVPacket struct.
982
 * Returns 0 on success or -1 on failure.
983
 */
984

    
985
static int
986
matroska_deliver_packet (MatroskaDemuxContext *matroska,
987
                         AVPacket             *pkt)
988
{
989
    if (matroska->num_packets > 0) {
990
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
991
        av_free(matroska->packets[0]);
992
        if (matroska->num_packets > 1) {
993
            memmove(&matroska->packets[0], &matroska->packets[1],
994
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
995
            matroska->packets =
996
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
997
                           sizeof(AVPacket *));
998
        } else {
999
            av_free(matroska->packets);
1000
            matroska->packets = NULL;
1001
        }
1002
        matroska->num_packets--;
1003
        return 0;
1004
    }
1005

    
1006
    return -1;
1007
}
1008

    
1009
/*
1010
 * Put a packet into our internal queue. Will be delivered to the
1011
 * user/application during the next get_packet() call.
1012
 */
1013

    
1014
static void
1015
matroska_queue_packet (MatroskaDemuxContext *matroska,
1016
                       AVPacket             *pkt)
1017
{
1018
    matroska->packets =
1019
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1020
                   sizeof(AVPacket *));
1021
    matroska->packets[matroska->num_packets] = pkt;
1022
    matroska->num_packets++;
1023
}
1024

    
1025
/*
1026
 * Autodetecting...
1027
 */
1028

    
1029
static int
1030
matroska_probe (AVProbeData *p)
1031
{
1032
    uint64_t total = 0;
1033
    int len_mask = 0x80, size = 1, n = 1;
1034
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1035

    
1036
    if (p->buf_size < 5)
1037
        return 0;
1038

    
1039
    /* ebml header? */
1040
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1041
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1042
        return 0;
1043

    
1044
    /* length of header */
1045
    total = p->buf[4];
1046
    while (size <= 8 && !(total & len_mask)) {
1047
        size++;
1048
        len_mask >>= 1;
1049
    }
1050
    if (size > 8)
1051
      return 0;
1052
    total &= (len_mask - 1);
1053
    while (n < size)
1054
        total = (total << 8) | p->buf[4 + n++];
1055

    
1056
    /* does the probe data contain the whole header? */
1057
    if (p->buf_size < 4 + size + total)
1058
      return 0;
1059

    
1060
    /* the header must contain the document type 'matroska'. For now,
1061
     * we don't parse the whole header but simply check for the
1062
     * availability of that array of characters inside the header.
1063
     * Not fully fool-proof, but good enough. */
1064
    for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
1065
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1066
            return AVPROBE_SCORE_MAX;
1067

    
1068
    return 0;
1069
}
1070

    
1071
/*
1072
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1073
 */
1074

    
1075
static int
1076
matroska_parse_info (MatroskaDemuxContext *matroska)
1077
{
1078
    int res = 0;
1079
    uint32_t id;
1080

    
1081
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1082

    
1083
    while (res == 0) {
1084
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1085
            res = AVERROR_IO;
1086
            break;
1087
        } else if (matroska->level_up) {
1088
            matroska->level_up--;
1089
            break;
1090
        }
1091

    
1092
        switch (id) {
1093
            /* cluster timecode */
1094
            case MATROSKA_ID_TIMECODESCALE: {
1095
                uint64_t num;
1096
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1097
                    break;
1098
                matroska->time_scale = num;
1099
                break;
1100
            }
1101

    
1102
            case MATROSKA_ID_DURATION: {
1103
                double num;
1104
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1105
                    break;
1106
                matroska->duration = num * matroska->time_scale;
1107
                break;
1108
            }
1109

    
1110
            case MATROSKA_ID_WRITINGAPP: {
1111
                char *text;
1112
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1113
                    break;
1114
                matroska->writing_app = text;
1115
                break;
1116
            }
1117

    
1118
            case MATROSKA_ID_MUXINGAPP: {
1119
                char *text;
1120
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1121
                    break;
1122
                matroska->muxing_app = text;
1123
                break;
1124
            }
1125

    
1126
            case MATROSKA_ID_DATEUTC: {
1127
                int64_t time;
1128
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1129
                    break;
1130
                matroska->created = time;
1131
                break;
1132
            }
1133

    
1134
            default:
1135
                av_log(matroska->ctx, AV_LOG_INFO,
1136
                       "Unknown entry 0x%x in info header\n", id);
1137
                /* fall-through */
1138

    
1139
            case EBML_ID_VOID:
1140
                res = ebml_read_skip(matroska);
1141
                break;
1142
        }
1143

    
1144
        if (matroska->level_up) {
1145
            matroska->level_up--;
1146
            break;
1147
        }
1148
    }
1149

    
1150
    return res;
1151
}
1152

    
1153
static int
1154
matroska_add_stream (MatroskaDemuxContext *matroska)
1155
{
1156
    int res = 0;
1157
    uint32_t id;
1158
    MatroskaTrack *track;
1159

    
1160
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1161

    
1162
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1163
    track = av_mallocz(sizeof(MatroskaTrack));
1164
    matroska->num_tracks++;
1165

    
1166
    /* start with the master */
1167
    if ((res = ebml_read_master(matroska, &id)) < 0)
1168
        return res;
1169

    
1170
    /* try reading the trackentry headers */
1171
    while (res == 0) {
1172
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1173
            res = AVERROR_IO;
1174
            break;
1175
        } else if (matroska->level_up > 0) {
1176
            matroska->level_up--;
1177
            break;
1178
        }
1179

    
1180
        switch (id) {
1181
            /* track number (unique stream ID) */
1182
            case MATROSKA_ID_TRACKNUMBER: {
1183
                uint64_t num;
1184
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1185
                    break;
1186
                track->num = num;
1187
                break;
1188
            }
1189

    
1190
            /* track UID (unique identifier) */
1191
            case MATROSKA_ID_TRACKUID: {
1192
                uint64_t num;
1193
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1194
                    break;
1195
                track->uid = num;
1196
                break;
1197
            }
1198

    
1199
            /* track type (video, audio, combined, subtitle, etc.) */
1200
            case MATROSKA_ID_TRACKTYPE: {
1201
                uint64_t num;
1202
                if (track->type != 0) {
1203
                    av_log(matroska->ctx, AV_LOG_INFO,
1204
                           "More than one tracktype in an entry - skip\n");
1205
                    break;
1206
                }
1207
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1208
                    break;
1209
                track->type = num;
1210

    
1211
                /* ok, so we're actually going to reallocate this thing */
1212
                switch (track->type) {
1213
                    case MATROSKA_TRACK_TYPE_VIDEO:
1214
                        track = (MatroskaTrack *)
1215
                            av_realloc(track, sizeof(MatroskaVideoTrack));
1216
                        break;
1217
                    case MATROSKA_TRACK_TYPE_AUDIO:
1218
                        track = (MatroskaTrack *)
1219
                            av_realloc(track, sizeof(MatroskaAudioTrack));
1220
                        ((MatroskaAudioTrack *)track)->channels = 1;
1221
                        ((MatroskaAudioTrack *)track)->samplerate = 8000;
1222
                        break;
1223
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1224
                        track = (MatroskaTrack *)
1225
                            av_realloc(track, sizeof(MatroskaSubtitleTrack));
1226
                        break;
1227
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1228
                    case MATROSKA_TRACK_TYPE_LOGO:
1229
                    case MATROSKA_TRACK_TYPE_CONTROL:
1230
                    default:
1231
                        av_log(matroska->ctx, AV_LOG_INFO,
1232
                               "Unknown or unsupported track type 0x%x\n",
1233
                               track->type);
1234
                        track->type = 0;
1235
                        break;
1236
                }
1237
                matroska->tracks[matroska->num_tracks - 1] = track;
1238
                break;
1239
            }
1240

    
1241
            /* tracktype specific stuff for video */
1242
            case MATROSKA_ID_TRACKVIDEO: {
1243
                MatroskaVideoTrack *videotrack;
1244
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1245
                    av_log(matroska->ctx, AV_LOG_INFO,
1246
                           "video data in non-video track - ignoring\n");
1247
                    res = AVERROR_INVALIDDATA;
1248
                    break;
1249
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1250
                    break;
1251
                videotrack = (MatroskaVideoTrack *)track;
1252

    
1253
                while (res == 0) {
1254
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1255
                        res = AVERROR_IO;
1256
                        break;
1257
                    } else if (matroska->level_up > 0) {
1258
                        matroska->level_up--;
1259
                        break;
1260
                    }
1261

    
1262
                    switch (id) {
1263
                        /* fixme, this should be one-up, but I get it here */
1264
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1265
                            uint64_t num;
1266
                            if ((res = ebml_read_uint (matroska, &id,
1267
                                                       &num)) < 0)
1268
                                break;
1269
                            track->default_duration = num;
1270
                            break;
1271
                        }
1272

    
1273
                        /* video framerate */
1274
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1275
                            double num;
1276
                            if ((res = ebml_read_float(matroska, &id,
1277
                                                       &num)) < 0)
1278
                                break;
1279
                            track->default_duration = 1000000000 * (1. / num);
1280
                            break;
1281
                        }
1282

    
1283
                        /* width of the size to display the video at */
1284
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1285
                            uint64_t num;
1286
                            if ((res = ebml_read_uint(matroska, &id,
1287
                                                      &num)) < 0)
1288
                                break;
1289
                            videotrack->display_width = num;
1290
                            break;
1291
                        }
1292

    
1293
                        /* height of the size to display the video at */
1294
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1295
                            uint64_t num;
1296
                            if ((res = ebml_read_uint(matroska, &id,
1297
                                                      &num)) < 0)
1298
                                break;
1299
                            videotrack->display_height = num;
1300
                            break;
1301
                        }
1302

    
1303
                        /* width of the video in the file */
1304
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1305
                            uint64_t num;
1306
                            if ((res = ebml_read_uint(matroska, &id,
1307
                                                      &num)) < 0)
1308
                                break;
1309
                            videotrack->pixel_width = num;
1310
                            break;
1311
                        }
1312

    
1313
                        /* height of the video in the file */
1314
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1315
                            uint64_t num;
1316
                            if ((res = ebml_read_uint(matroska, &id,
1317
                                                      &num)) < 0)
1318
                                break;
1319
                            videotrack->pixel_height = num;
1320
                            break;
1321
                        }
1322

    
1323
                        /* whether the video is interlaced */
1324
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1325
                            uint64_t num;
1326
                            if ((res = ebml_read_uint(matroska, &id,
1327
                                                      &num)) < 0)
1328
                                break;
1329
                            if (num)
1330
                                track->flags |=
1331
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1332
                            else
1333
                                track->flags &=
1334
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1335
                            break;
1336
                        }
1337

    
1338
                        /* stereo mode (whether the video has two streams,
1339
                         * where one is for the left eye and the other for
1340
                         * the right eye, which creates a 3D-like
1341
                         * effect) */
1342
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1343
                            uint64_t num;
1344
                            if ((res = ebml_read_uint(matroska, &id,
1345
                                                      &num)) < 0)
1346
                                break;
1347
                            if (num != MATROSKA_EYE_MODE_MONO &&
1348
                                num != MATROSKA_EYE_MODE_LEFT &&
1349
                                num != MATROSKA_EYE_MODE_RIGHT &&
1350
                                num != MATROSKA_EYE_MODE_BOTH) {
1351
                                av_log(matroska->ctx, AV_LOG_INFO,
1352
                                       "Ignoring unknown eye mode 0x%x\n",
1353
                                       (uint32_t) num);
1354
                                break;
1355
                            }
1356
                            videotrack->eye_mode = num;
1357
                            break;
1358
                        }
1359

    
1360
                        /* aspect ratio behaviour */
1361
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1362
                            uint64_t num;
1363
                            if ((res = ebml_read_uint(matroska, &id,
1364
                                                      &num)) < 0)
1365
                                break;
1366
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1367
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1368
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1369
                                av_log(matroska->ctx, AV_LOG_INFO,
1370
                                       "Ignoring unknown aspect ratio 0x%x\n",
1371
                                       (uint32_t) num);
1372
                                break;
1373
                            }
1374
                            videotrack->ar_mode = num;
1375
                            break;
1376
                        }
1377

    
1378
                        /* colourspace (only matters for raw video)
1379
                         * fourcc */
1380
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1381
                            uint64_t num;
1382
                            if ((res = ebml_read_uint(matroska, &id,
1383
                                                      &num)) < 0)
1384
                                break;
1385
                            videotrack->fourcc = num;
1386
                            break;
1387
                        }
1388

    
1389
                        default:
1390
                            av_log(matroska->ctx, AV_LOG_INFO,
1391
                                   "Unknown video track header entry "
1392
                                   "0x%x - ignoring\n", id);
1393
                            /* pass-through */
1394

    
1395
                        case EBML_ID_VOID:
1396
                            res = ebml_read_skip(matroska);
1397
                            break;
1398
                    }
1399

    
1400
                    if (matroska->level_up) {
1401
                        matroska->level_up--;
1402
                        break;
1403
                    }
1404
                }
1405
                break;
1406
            }
1407

    
1408
            /* tracktype specific stuff for audio */
1409
            case MATROSKA_ID_TRACKAUDIO: {
1410
                MatroskaAudioTrack *audiotrack;
1411
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1412
                    av_log(matroska->ctx, AV_LOG_INFO,
1413
                           "audio data in non-audio track - ignoring\n");
1414
                    res = AVERROR_INVALIDDATA;
1415
                    break;
1416
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1417
                    break;
1418
                audiotrack = (MatroskaAudioTrack *)track;
1419

    
1420
                while (res == 0) {
1421
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1422
                        res = AVERROR_IO;
1423
                        break;
1424
                    } else if (matroska->level_up > 0) {
1425
                        matroska->level_up--;
1426
                        break;
1427
                    }
1428

    
1429
                    switch (id) {
1430
                        /* samplerate */
1431
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1432
                            double num;
1433
                            if ((res = ebml_read_float(matroska, &id,
1434
                                                       &num)) < 0)
1435
                                break;
1436
                            audiotrack->samplerate = num;
1437
                            break;
1438
                        }
1439

    
1440
                            /* bitdepth */
1441
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1442
                            uint64_t num;
1443
                            if ((res = ebml_read_uint(matroska, &id,
1444
                                                      &num)) < 0)
1445
                                break;
1446
                            audiotrack->bitdepth = num;
1447
                            break;
1448
                        }
1449

    
1450
                            /* channels */
1451
                        case MATROSKA_ID_AUDIOCHANNELS: {
1452
                            uint64_t num;
1453
                            if ((res = ebml_read_uint(matroska, &id,
1454
                                                      &num)) < 0)
1455
                                break;
1456
                            audiotrack->channels = num;
1457
                            break;
1458
                        }
1459

    
1460
                        default:
1461
                            av_log(matroska->ctx, AV_LOG_INFO,
1462
                                   "Unknown audio track header entry "
1463
                                   "0x%x - ignoring\n", id);
1464
                            /* pass-through */
1465

    
1466
                        case EBML_ID_VOID:
1467
                            res = ebml_read_skip(matroska);
1468
                            break;
1469
                    }
1470

    
1471
                    if (matroska->level_up) {
1472
                        matroska->level_up--;
1473
                        break;
1474
                    }
1475
                }
1476
                break;
1477
            }
1478

    
1479
                /* codec identifier */
1480
            case MATROSKA_ID_CODECID: {
1481
                char *text;
1482
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1483
                    break;
1484
                track->codec_id = text;
1485
                break;
1486
            }
1487

    
1488
                /* codec private data */
1489
            case MATROSKA_ID_CODECPRIVATE: {
1490
                uint8_t *data;
1491
                int size;
1492
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1493
                    break;
1494
                track->codec_priv = data;
1495
                track->codec_priv_size = size;
1496
                break;
1497
            }
1498

    
1499
                /* name of the codec */
1500
            case MATROSKA_ID_CODECNAME: {
1501
                char *text;
1502
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1503
                    break;
1504
                track->codec_name = text;
1505
                break;
1506
            }
1507

    
1508
                /* name of this track */
1509
            case MATROSKA_ID_TRACKNAME: {
1510
                char *text;
1511
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1512
                    break;
1513
                track->name = text;
1514
                break;
1515
            }
1516

    
1517
                /* language (matters for audio/subtitles, mostly) */
1518
            case MATROSKA_ID_TRACKLANGUAGE: {
1519
                char *text;
1520
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1521
                    break;
1522
                track->language = text;
1523
                break;
1524
            }
1525

    
1526
                /* whether this is actually used */
1527
            case MATROSKA_ID_TRACKFLAGENABLED: {
1528
                uint64_t num;
1529
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1530
                    break;
1531
                if (num)
1532
                    track->flags |= MATROSKA_TRACK_ENABLED;
1533
                else
1534
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1535
                break;
1536
            }
1537

    
1538
                /* whether it's the default for this track type */
1539
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1540
                uint64_t num;
1541
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1542
                    break;
1543
                if (num)
1544
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1545
                else
1546
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1547
                break;
1548
            }
1549

    
1550
                /* lacing (like MPEG, where blocks don't end/start on frame
1551
                 * boundaries) */
1552
            case MATROSKA_ID_TRACKFLAGLACING: {
1553
                uint64_t num;
1554
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1555
                    break;
1556
                if (num)
1557
                    track->flags |= MATROSKA_TRACK_LACING;
1558
                else
1559
                    track->flags &= ~MATROSKA_TRACK_LACING;
1560
                break;
1561
            }
1562

    
1563
                /* default length (in time) of one data block in this track */
1564
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1565
                uint64_t num;
1566
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1567
                    break;
1568
                track->default_duration = num;
1569
                break;
1570
            }
1571

    
1572
            default:
1573
                av_log(matroska->ctx, AV_LOG_INFO,
1574
                       "Unknown track header entry 0x%x - ignoring\n", id);
1575
                /* pass-through */
1576

    
1577
            case EBML_ID_VOID:
1578
            /* we ignore these because they're nothing useful. */
1579
            case MATROSKA_ID_CODECINFOURL:
1580
            case MATROSKA_ID_CODECDOWNLOADURL:
1581
            case MATROSKA_ID_TRACKMINCACHE:
1582
            case MATROSKA_ID_TRACKMAXCACHE:
1583
                res = ebml_read_skip(matroska);
1584
                break;
1585
        }
1586

    
1587
        if (matroska->level_up) {
1588
            matroska->level_up--;
1589
            break;
1590
        }
1591
    }
1592

    
1593
    return res;
1594
}
1595

    
1596
static int
1597
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1598
{
1599
    int res = 0;
1600
    uint32_t id;
1601

    
1602
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1603

    
1604
    while (res == 0) {
1605
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1606
            res = AVERROR_IO;
1607
            break;
1608
        } else if (matroska->level_up) {
1609
            matroska->level_up--;
1610
            break;
1611
        }
1612

    
1613
        switch (id) {
1614
            /* one track within the "all-tracks" header */
1615
            case MATROSKA_ID_TRACKENTRY:
1616
                res = matroska_add_stream(matroska);
1617
                break;
1618

    
1619
            default:
1620
                av_log(matroska->ctx, AV_LOG_INFO,
1621
                       "Unknown entry 0x%x in track header\n", id);
1622
                /* fall-through */
1623

    
1624
            case EBML_ID_VOID:
1625
                res = ebml_read_skip(matroska);
1626
                break;
1627
        }
1628

    
1629
        if (matroska->level_up) {
1630
            matroska->level_up--;
1631
            break;
1632
        }
1633
    }
1634

    
1635
    return res;
1636
}
1637

    
1638
static int
1639
matroska_parse_index (MatroskaDemuxContext *matroska)
1640
{
1641
    int res = 0;
1642
    uint32_t id;
1643
    MatroskaDemuxIndex idx;
1644

    
1645
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1646

    
1647
    while (res == 0) {
1648
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1649
            res = AVERROR_IO;
1650
            break;
1651
        } else if (matroska->level_up) {
1652
            matroska->level_up--;
1653
            break;
1654
        }
1655

    
1656
        switch (id) {
1657
            /* one single index entry ('point') */
1658
            case MATROSKA_ID_POINTENTRY:
1659
                if ((res = ebml_read_master(matroska, &id)) < 0)
1660
                    break;
1661

    
1662
                /* in the end, we hope to fill one entry with a
1663
                 * timestamp, a file position and a tracknum */
1664
                idx.pos   = (uint64_t) -1;
1665
                idx.time  = (uint64_t) -1;
1666
                idx.track = (uint16_t) -1;
1667

    
1668
                while (res == 0) {
1669
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1670
                        res = AVERROR_IO;
1671
                        break;
1672
                    } else if (matroska->level_up) {
1673
                        matroska->level_up--;
1674
                        break;
1675
                    }
1676

    
1677
                    switch (id) {
1678
                        /* one single index entry ('point') */
1679
                        case MATROSKA_ID_CUETIME: {
1680
                            int64_t time;
1681
                            if ((res = ebml_read_uint(matroska, &id,
1682
                                                      &time)) < 0)
1683
                                break;
1684
                            idx.time = time * matroska->time_scale;
1685
                            break;
1686
                        }
1687

    
1688
                        /* position in the file + track to which it 
1689
                         * belongs */
1690
                        case MATROSKA_ID_CUETRACKPOSITION:
1691
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1692
                                break;
1693

    
1694
                            while (res == 0) {
1695
                                if (!(id = ebml_peek_id (matroska,
1696
                                                    &matroska->level_up))) {
1697
                                    res = AVERROR_IO;
1698
                                    break;
1699
                                } else if (matroska->level_up) {
1700
                                    matroska->level_up--;
1701
                                    break;
1702
                                }
1703

    
1704
                                switch (id) {
1705
                                    /* track number */
1706
                                    case MATROSKA_ID_CUETRACK: {
1707
                                        uint64_t num;
1708
                                        if ((res = ebml_read_uint(matroska,
1709
                                                          &id, &num)) < 0)
1710
                                            break;
1711
                                        idx.track = num;
1712
                                        break;
1713
                                    }
1714

    
1715
                                        /* position in file */
1716
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1717
                                        uint64_t num;
1718
                                        if ((res = ebml_read_uint(matroska,
1719
                                                          &id, &num)) < 0)
1720
                                            break;
1721
                                        idx.pos = num;
1722
                                        break;
1723
                                    }
1724

    
1725
                                    default:
1726
                                        av_log(matroska->ctx, AV_LOG_INFO,
1727
                                               "Unknown entry 0x%x in "
1728
                                               "CuesTrackPositions\n", id);
1729
                                        /* fall-through */
1730

    
1731
                                    case EBML_ID_VOID:
1732
                                        res = ebml_read_skip(matroska);
1733
                                        break;
1734
                                }
1735

    
1736
                                if (matroska->level_up) {
1737
                                    matroska->level_up--;
1738
                                    break;
1739
                                }
1740
                            }
1741

    
1742
                            break;
1743

    
1744
                        default:
1745
                            av_log(matroska->ctx, AV_LOG_INFO,
1746
                                   "Unknown entry 0x%x in cuespoint "
1747
                                   "index\n", id);
1748
                            /* fall-through */
1749

    
1750
                        case EBML_ID_VOID:
1751
                            res = ebml_read_skip(matroska);
1752
                            break;
1753
                    }
1754

    
1755
                    if (matroska->level_up) {
1756
                        matroska->level_up--;
1757
                        break;
1758
                    }
1759
                }
1760

    
1761
                /* so let's see if we got what we wanted */
1762
                if (idx.pos   != (uint64_t) -1 &&
1763
                    idx.time  != (uint64_t) -1 &&
1764
                    idx.track != (uint16_t) -1) {
1765
                    if (matroska->num_indexes % 32 == 0) {
1766
                        /* re-allocate bigger index */
1767
                        matroska->index =
1768
                            av_realloc(matroska->index,
1769
                                       (matroska->num_indexes + 32) *
1770
                                       sizeof(MatroskaDemuxIndex));
1771
                    }
1772
                    matroska->index[matroska->num_indexes] = idx;
1773
                    matroska->num_indexes++;
1774
                }
1775
                break;
1776

    
1777
            default:
1778
                av_log(matroska->ctx, AV_LOG_INFO,
1779
                       "Unknown entry 0x%x in cues header\n", id);
1780
                /* fall-through */
1781

    
1782
            case EBML_ID_VOID:
1783
                res = ebml_read_skip(matroska);
1784
                break;
1785
        }
1786

    
1787
        if (matroska->level_up) {
1788
            matroska->level_up--;
1789
            break;
1790
        }
1791
    }
1792

    
1793
    return res;
1794
}
1795

    
1796
static int
1797
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1798
{
1799
    int res = 0;
1800
    uint32_t id;
1801

    
1802
    while (res == 0) {
1803
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1804
            res = AVERROR_IO;
1805
            break;
1806
        } else if (matroska->level_up) {
1807
            matroska->level_up--;
1808
            break;
1809
        }
1810

    
1811
        switch (id) {
1812
            /* Hm, this is unsupported... */
1813
            default:
1814
                av_log(matroska->ctx, AV_LOG_INFO,
1815
                       "Unknown entry 0x%x in metadata header\n", id);
1816
                /* fall-through */
1817

    
1818
            case EBML_ID_VOID:
1819
                res = ebml_read_skip(matroska);
1820
                break;
1821
        }
1822

    
1823
        if (matroska->level_up) {
1824
            matroska->level_up--;
1825
            break;
1826
        }
1827
    }
1828

    
1829
    return res;
1830
}
1831

    
1832
static int
1833
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1834
{
1835
    int res = 0;
1836
    uint32_t id;
1837

    
1838
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1839

    
1840
    while (res == 0) {
1841
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1842
            res = AVERROR_IO;
1843
            break;
1844
        } else if (matroska->level_up) {
1845
            matroska->level_up--;
1846
            break;
1847
        }
1848

    
1849
        switch (id) {
1850
            case MATROSKA_ID_SEEKENTRY: {
1851
                uint32_t seek_id = 0, peek_id_cache = 0;
1852
                uint64_t seek_pos = (uint64_t) -1, t;
1853

    
1854
                if ((res = ebml_read_master(matroska, &id)) < 0)
1855
                    break;
1856

    
1857
                while (res == 0) {
1858
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1859
                        res = AVERROR_IO;
1860
                        break;
1861
                    } else if (matroska->level_up) {
1862
                        matroska->level_up--;
1863
                        break;
1864
                    }
1865

    
1866
                    switch (id) {
1867
                        case MATROSKA_ID_SEEKID:
1868
                            res = ebml_read_uint(matroska, &id, &t);
1869
                            seek_id = t;
1870
                            break;
1871

    
1872
                        case MATROSKA_ID_SEEKPOSITION:
1873
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1874
                            break;
1875

    
1876
                        default:
1877
                            av_log(matroska->ctx, AV_LOG_INFO,
1878
                                   "Unknown seekhead ID 0x%x\n", id);
1879
                            /* fall-through */
1880

    
1881
                        case EBML_ID_VOID:
1882
                            res = ebml_read_skip(matroska);
1883
                            break;
1884
                    }
1885

    
1886
                    if (matroska->level_up) {
1887
                        matroska->level_up--;
1888
                        break;
1889
                    }
1890
                }
1891

    
1892
                if (!seek_id || seek_pos == (uint64_t) -1) {
1893
                    av_log(matroska->ctx, AV_LOG_INFO,
1894
                           "Incomplete seekhead entry (0x%x/%llu)\n",
1895
                           seek_id, seek_pos);
1896
                    break;
1897
                }
1898

    
1899
                switch (seek_id) {
1900
                    case MATROSKA_ID_CUES:
1901
                    case MATROSKA_ID_TAGS: {
1902
                        uint32_t level_up = matroska->level_up;
1903
                        offset_t before_pos;
1904
                        uint64_t length;
1905
                        MatroskaLevel level;
1906

    
1907
                        /* remember the peeked ID and the current position */
1908
                        peek_id_cache = matroska->peek_id;
1909
                        before_pos = url_ftell(&matroska->ctx->pb);
1910

    
1911
                        /* seek */
1912
                        if ((res = ebml_read_seek(matroska, seek_pos +
1913
                                               matroska->segment_start)) < 0)
1914
                            return res;
1915

    
1916
                        /* we don't want to lose our seekhead level, so we add
1917
                         * a dummy. This is a crude hack. */
1918
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1919
                            av_log(matroska->ctx, AV_LOG_INFO,
1920
                                   "Max EBML element depth (%d) reached, "
1921
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1922
                            return AVERROR_UNKNOWN;
1923
                        }
1924
                            
1925
                        level.start = 0;
1926
                        level.length = (uint64_t)-1;
1927
                        matroska->levels[matroska->num_levels] = level;
1928
                        matroska->num_levels++;
1929

    
1930
                        /* check ID */
1931
                        if (!(id = ebml_peek_id (matroska,
1932
                                                 &matroska->level_up)))
1933
                            break;
1934
                        if (id != seek_id) {
1935
                            av_log(matroska->ctx, AV_LOG_INFO,
1936
                                   "We looked for ID=0x%x but got "
1937
                                   "ID=0x%x (pos=%llu)",
1938
                                   seek_id, id, seek_pos +
1939
                                   matroska->segment_start);
1940
                            goto finish;
1941
                        }
1942

    
1943
                        /* read master + parse */
1944
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1945
                            break;
1946
                        switch (id) {
1947
                            case MATROSKA_ID_CUES:
1948
                                if (!(res = matroska_parse_index(matroska)) ||
1949
                                    url_feof(&matroska->ctx->pb)) {
1950
                                    matroska->index_parsed = 1;
1951
                                    res = 0;
1952
                                }
1953
                                break;
1954
                            case MATROSKA_ID_TAGS:
1955
                                if (!(res = matroska_parse_metadata(matroska)) ||
1956
                                   url_feof(&matroska->ctx->pb)) {
1957
                                    matroska->metadata_parsed = 1;
1958
                                    res = 0;
1959
                                }
1960
                                break;
1961
                        }
1962
                        if (res < 0)
1963
                            break;
1964

    
1965
                    finish:
1966
                        /* remove dummy level */
1967
                        while (matroska->num_levels) {
1968
                            matroska->num_levels--;
1969
                            length =
1970
                                matroska->levels[matroska->num_levels].length;
1971
                            if (length == (uint64_t)-1)
1972
                                break;
1973
                        }
1974

    
1975
                        /* seek back */
1976
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1977
                            return res;
1978
                        matroska->peek_id = peek_id_cache;
1979
                        matroska->level_up = level_up;
1980
                        break;
1981
                    }
1982

    
1983
                    default:
1984
                        av_log(matroska->ctx, AV_LOG_INFO,
1985
                               "Ignoring seekhead entry for ID=0x%x\n",
1986
                               seek_id);
1987
                        break;
1988
                }
1989

    
1990
                break;
1991
            }
1992

    
1993
            default:
1994
                av_log(matroska->ctx, AV_LOG_INFO,
1995
                       "Unknown seekhead ID 0x%x\n", id);
1996
                /* fall-through */
1997

    
1998
            case EBML_ID_VOID:
1999
                res = ebml_read_skip(matroska);
2000
                break;
2001
        }
2002

    
2003
        if (matroska->level_up) {
2004
            matroska->level_up--;
2005
            break;
2006
        }
2007
    }
2008

    
2009
    return res;
2010
}
2011

    
2012
static int
2013
matroska_read_header (AVFormatContext    *s,
2014
                      AVFormatParameters *ap)
2015
{
2016
    MatroskaDemuxContext *matroska = s->priv_data;
2017
    char *doctype;
2018
    int version, last_level, res = 0;
2019
    uint32_t id;
2020

    
2021
    matroska->ctx = s;
2022

    
2023
    /* First read the EBML header. */
2024
    doctype = NULL;
2025
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2026
        return res;
2027
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2028
        av_log(matroska->ctx, AV_LOG_ERROR,
2029
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2030
               doctype ? doctype : "(none)");
2031
        if (doctype)
2032
            av_free(doctype);
2033
        return AVERROR_NOFMT;
2034
    }
2035
    av_free(doctype);
2036
    if (version != 1) {
2037
        av_log(matroska->ctx, AV_LOG_ERROR,
2038
               "Matroska demuxer version 1 too old for file version %d\n",
2039
               version);
2040
        return AVERROR_NOFMT;
2041
    }
2042

    
2043
    /* The next thing is a segment. */
2044
    while (1) {
2045
        if (!(id = ebml_peek_id(matroska, &last_level)))
2046
            return AVERROR_IO;
2047
        if (id == MATROSKA_ID_SEGMENT)
2048
            break;
2049

    
2050
        /* oi! */
2051
        av_log(matroska->ctx, AV_LOG_INFO,
2052
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2053
               MATROSKA_ID_SEGMENT, id);
2054
        if ((res = ebml_read_skip(matroska)) < 0)
2055
            return res;
2056
    }
2057

    
2058
    /* We now have a Matroska segment.
2059
     * Seeks are from the beginning of the segment,
2060
     * after the segment ID/length. */
2061
    if ((res = ebml_read_master(matroska, &id)) < 0)
2062
        return res;
2063
    matroska->segment_start = url_ftell(&s->pb);
2064

    
2065
    matroska->time_scale = 1000000;
2066
    /* we've found our segment, start reading the different contents in here */
2067
    while (res == 0) {
2068
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2069
            res = AVERROR_IO;
2070
            break;
2071
        } else if (matroska->level_up) {
2072
            matroska->level_up--;
2073
            break;
2074
        }
2075

    
2076
        switch (id) {
2077
            /* stream info */
2078
            case MATROSKA_ID_INFO: {
2079
                if ((res = ebml_read_master(matroska, &id)) < 0)
2080
                    break;
2081
                res = matroska_parse_info(matroska);
2082
                break;
2083
            }
2084

    
2085
            /* track info headers */
2086
            case MATROSKA_ID_TRACKS: {
2087
                if ((res = ebml_read_master(matroska, &id)) < 0)
2088
                    break;
2089
                res = matroska_parse_tracks(matroska);
2090
                break;
2091
            }
2092

    
2093
            /* stream index */
2094
            case MATROSKA_ID_CUES: {
2095
                if (!matroska->index_parsed) {
2096
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2097
                        break;
2098
                    res = matroska_parse_index(matroska);
2099
                } else
2100
                    res = ebml_read_skip(matroska);
2101
                break;
2102
            }
2103

    
2104
            /* metadata */
2105
            case MATROSKA_ID_TAGS: {
2106
                if (!matroska->metadata_parsed) {
2107
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2108
                        break;
2109
                    res = matroska_parse_metadata(matroska);
2110
                } else
2111
                    res = ebml_read_skip(matroska);
2112
                break;
2113
            }
2114

    
2115
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2116
            case MATROSKA_ID_SEEKHEAD: {
2117
                if ((res = ebml_read_master(matroska, &id)) < 0)
2118
                    break;
2119
                res = matroska_parse_seekhead(matroska);
2120
                break;
2121
            }
2122

    
2123
            case MATROSKA_ID_CLUSTER: {
2124
                /* Do not read the master - this will be done in the next
2125
                 * call to matroska_read_packet. */
2126
                res = 1;
2127
                break;
2128
            }
2129

    
2130
            default:
2131
                av_log(matroska->ctx, AV_LOG_INFO,
2132
                       "Unknown matroska file header ID 0x%x\n", id);
2133
            /* fall-through */
2134

    
2135
            case EBML_ID_VOID:
2136
                res = ebml_read_skip(matroska);
2137
                break;
2138
        }
2139

    
2140
        if (matroska->level_up) {
2141
            matroska->level_up--;
2142
            break;
2143
        }
2144
    }
2145

    
2146
    if (res < 0)
2147
        return res;
2148

    
2149
    /* Have we found a cluster? */
2150
    if (res == 1) {
2151
        int i;
2152
        enum CodecID codec_id;
2153
        MatroskaTrack *track;
2154
        AVStream *st;
2155
        void *extradata = NULL;
2156
        int extradata_size = 0;
2157

    
2158
        for (i = 0; i < matroska->num_tracks; i++) {
2159
            track = matroska->tracks[i];
2160

    
2161
            /* libavformat does not really support subtitles.
2162
             * Also apply some sanity checks. */
2163
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2164
                (track->codec_id == NULL))
2165
                continue;
2166

    
2167
            /* Set the FourCC from the CodecID. */
2168
            /* This is the MS compatibility mode which stores a
2169
             * BITMAPINFOHEADER in the CodecPrivate. */
2170
            if (!strcmp(track->codec_id,
2171
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2172
                (track->codec_priv_size >= 40) &&
2173
                (track->codec_priv != NULL)) {
2174
                unsigned char *p;
2175

    
2176
                /* Offset of biCompression. Stored in LE. */
2177
                p = (unsigned char *)track->codec_priv + 16;
2178
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2179
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2180
                codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2181

    
2182
            } else if (!strcmp(track->codec_id,
2183
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
2184
                       !strcmp(track->codec_id,
2185
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
2186
                       !strcmp(track->codec_id,
2187
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
2188
                codec_id = CODEC_ID_MPEG4;
2189
            else if (!strcmp(track->codec_id,
2190
                             MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC))
2191
                codec_id = CODEC_ID_H264;
2192
/*             else if (!strcmp(track->codec_id, */
2193
/*                              MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
2194
/*                 codec_id = CODEC_ID_???; */
2195
            else if (!strcmp(track->codec_id,
2196
                             MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
2197
                codec_id = CODEC_ID_MSMPEG4V3;
2198
            else if (!strcmp(track->codec_id,
2199
                             MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
2200
                     !strcmp(track->codec_id,
2201
                             MATROSKA_CODEC_ID_VIDEO_MPEG2))
2202
                codec_id = CODEC_ID_MPEG2VIDEO;
2203

    
2204
            /* This is the MS compatibility mode which stores a
2205
             * WAVEFORMATEX in the CodecPrivate. */
2206
            else if (!strcmp(track->codec_id, 
2207
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2208
                (track->codec_priv_size >= 18) &&
2209
                (track->codec_priv != NULL)) {
2210
                unsigned char *p;
2211
                uint16_t tag;
2212

    
2213
                /* Offset of wFormatTag. Stored in LE. */
2214
                p = (unsigned char *)track->codec_priv;
2215
                tag = (p[1] << 8) | p[0];
2216
                codec_id = codec_get_wav_id(tag);
2217

    
2218
            } else if (!strcmp(track->codec_id,
2219
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
2220
                       !strcmp(track->codec_id,
2221
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
2222
                       !strcmp(track->codec_id,
2223
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
2224
                codec_id = CODEC_ID_MP3;
2225
            else if (!strcmp(track->codec_id,
2226
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
2227
                codec_id = CODEC_ID_PCM_U16BE;
2228
            else if (!strcmp(track->codec_id,
2229
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
2230
                codec_id = CODEC_ID_PCM_U16LE;
2231
/*             else if (!strcmp(track->codec_id, */
2232
/*                              MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
2233
/*                 codec_id = CODEC_ID_PCM_???; */
2234
            else if (!strcmp(track->codec_id,
2235
                             MATROSKA_CODEC_ID_AUDIO_AC3))
2236
                codec_id = CODEC_ID_AC3;
2237
            else if (!strcmp(track->codec_id,
2238
                             MATROSKA_CODEC_ID_AUDIO_DTS))
2239
                codec_id = CODEC_ID_DTS;
2240
            /* No such codec id so far. */
2241
/*             else if (!strcmp(track->codec_id, */
2242
/*                              MATROSKA_CODEC_ID_AUDIO_DTS)) */
2243
/*                 codec_id = CODEC_ID_DTS; */
2244
            else if (!strcmp(track->codec_id,
2245
                             MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
2246
                unsigned char *p = track->codec_priv, *cdp;
2247
                int cps = track->codec_priv_size;
2248
                int nf, s[3], cds;
2249
                int i;
2250

    
2251
                nf = *p++;
2252
                cps--;
2253

    
2254
                if(nf != 2)
2255
                    continue;
2256

    
2257
                for(i = 0; i < 2; i++){
2258
                    int xv;
2259
                    s[i] = 0;
2260
                    do {
2261
                        xv = *p++;
2262
                        s[i] += xv;
2263
                        cps--;
2264
                    } while(xv == 255);
2265
                }
2266

    
2267
                s[2] = cps - s[0] - s[1];
2268

    
2269
                cds = cps + 6;
2270
                extradata = cdp = av_malloc(cds);
2271
                if(extradata == NULL)
2272
                    return AVERROR_NOMEM;
2273
                extradata_size = cds;
2274

    
2275
                for(i = 0; i < 3; i++){
2276
                    *cdp++ = s[i] >> 8;
2277
                    *cdp++ = s[i] & 0xff;
2278
                    memcpy(cdp, p, s[i]);
2279
                    cdp += s[i];
2280
                    p += s[i];
2281
                    cps -= s[i];
2282
                }
2283

    
2284
                codec_id = CODEC_ID_VORBIS;
2285
            } else if (!strcmp(track->codec_id,
2286
                               MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
2287
                       !strcmp(track->codec_id,
2288
                               MATROSKA_CODEC_ID_AUDIO_MPEG4))
2289
                codec_id = CODEC_ID_AAC;
2290
            else
2291
                codec_id = CODEC_ID_NONE;
2292

    
2293
            if (codec_id == CODEC_ID_NONE) {
2294
                av_log(matroska->ctx, AV_LOG_INFO,
2295
                       "Unknown/unsupported CodecID %s.\n",
2296
                       track->codec_id);
2297
            }
2298

    
2299
            track->stream_index = matroska->num_streams;
2300

    
2301
            matroska->num_streams++;
2302
            st = av_new_stream(s, track->stream_index);
2303
            if (st == NULL)
2304
                return AVERROR_NOMEM;
2305
            av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
2306

    
2307
            st->codec.codec_id = codec_id;
2308

    
2309
            if(extradata){
2310
                st->codec.extradata = extradata;
2311
                st->codec.extradata_size = extradata_size;
2312
            } else if(track->codec_priv && track->codec_priv_size > 0){
2313
                st->codec.extradata = av_malloc(track->codec_priv_size);
2314
                if(st->codec.extradata == NULL)
2315
                    return AVERROR_NOMEM;
2316
                st->codec.extradata_size = track->codec_priv_size;
2317
                memcpy(st->codec.extradata, track->codec_priv,
2318
                       track->codec_priv_size);
2319
            }
2320

    
2321
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2322
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2323

    
2324
                st->codec.codec_type = CODEC_TYPE_VIDEO;
2325
                st->codec.codec_tag = videotrack->fourcc;
2326
                st->codec.width = videotrack->pixel_width;
2327
                st->codec.height = videotrack->pixel_height;
2328
                if (videotrack->display_width == 0)
2329
                    st->codec.sample_aspect_ratio.num =
2330
                        videotrack->pixel_width;
2331
                else
2332
                    st->codec.sample_aspect_ratio.num =
2333
                        videotrack->display_width;
2334
                if (videotrack->display_height == 0)
2335
                    st->codec.sample_aspect_ratio.num =
2336
                        videotrack->pixel_height;
2337
                else
2338
                    st->codec.sample_aspect_ratio.num =
2339
                        videotrack->display_height;
2340

    
2341
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2342
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2343

    
2344
                st->codec.codec_type = CODEC_TYPE_AUDIO;
2345
                st->codec.sample_rate = audiotrack->samplerate;
2346
                st->codec.channels = audiotrack->channels;
2347
            }
2348

    
2349
            /* What do we do with private data? E.g. for Vorbis. */
2350
        }
2351
    }
2352

    
2353
    return 0;
2354
}
2355

    
2356
static int
2357
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2358
                            int                   num)
2359
{
2360
    int i;
2361

    
2362
    for (i = 0; i < matroska->num_tracks; i++)
2363
        if (matroska->tracks[i]->num == num)
2364
            return i;
2365

    
2366
    return -1;
2367
}
2368

    
2369
static int
2370
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2371
                           uint64_t              cluster_time)
2372
{
2373
    int res = 0;
2374
    uint32_t id;
2375
    AVPacket *pkt;
2376
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2377

    
2378
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2379

    
2380
    while (res == 0) {
2381
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2382
            res = AVERROR_IO;
2383
            break;
2384
        } else if (matroska->level_up) {
2385
            matroska->level_up--;
2386
            break;
2387
        }
2388

    
2389
        switch (id) {
2390
            /* one block inside the group. Note, block parsing is one
2391
             * of the harder things, so this code is a bit complicated.
2392
             * See http://www.matroska.org/ for documentation. */
2393
            case MATROSKA_ID_BLOCK: {
2394
                uint8_t *data, *origdata;
2395
                int size;
2396
                uint64_t time;
2397
                uint32_t *lace_size = NULL;
2398
                int n, track, flags, laces = 0;
2399
                uint64_t num;
2400

    
2401
                if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2402
                    break;
2403
                origdata = data;
2404

    
2405
                /* first byte(s): blocknum */
2406
                if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2407
                    av_log(matroska->ctx, AV_LOG_ERROR,
2408
                           "EBML block data error\n");
2409
                    av_free(origdata);
2410
                    break;
2411
                }
2412
                data += n;
2413
                size -= n;
2414

    
2415
                /* fetch track from num */
2416
                track = matroska_find_track_by_num(matroska, num);
2417
                if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2418
                    av_log(matroska->ctx, AV_LOG_INFO,
2419
                           "Invalid stream %d or size %u\n", track, size);
2420
                    av_free(origdata);
2421
                    break;
2422
                }
2423
                if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2424
                    av_free(origdata);
2425
                    break;                
2426
                }
2427

    
2428
                /* time (relative to cluster time) */
2429
                time = ((data[0] << 8) | data[1]) * matroska->time_scale;
2430
                data += 2;
2431
                size -= 2;
2432
                flags = *data;
2433
                data += 1;
2434
                size -= 1;
2435
                switch ((flags & 0x06) >> 1) {
2436
                    case 0x0: /* no lacing */
2437
                        laces = 1;
2438
                        lace_size = av_mallocz(sizeof(int));
2439
                        lace_size[0] = size;
2440
                        break;
2441

    
2442
                    case 0x1: /* xiph lacing */
2443
                    case 0x2: /* fixed-size lacing */
2444
                    case 0x3: /* EBML lacing */
2445
                        if (size == 0) {
2446
                            res = -1;
2447
                            break;
2448
                        }
2449
                        laces = (*data) + 1;
2450
                        data += 1;
2451
                        size -= 1;
2452
                        lace_size = av_mallocz(laces * sizeof(int));
2453

    
2454
                        switch ((flags & 0x06) >> 1) {
2455
                            case 0x1: /* xiph lacing */ {
2456
                                uint8_t temp;
2457
                                uint32_t total = 0;
2458
                                for (n = 0; res == 0 && n < laces - 1; n++) {
2459
                                    while (1) {
2460
                                        if (size == 0) {
2461
                                            res = -1;
2462
                                            break;
2463
                                        }
2464
                                        temp = *data;
2465
                                        lace_size[n] += temp;
2466
                                        data += 1;
2467
                                        size -= 1;
2468
                                        if (temp != 0xff)
2469
                                            break;
2470
                                    }
2471
                                    total += lace_size[n];
2472
                                }
2473
                                lace_size[n] = size - total;
2474
                                break;
2475
                            }
2476

    
2477
                            case 0x2: /* fixed-size lacing */
2478
                                for (n = 0; n < laces; n++)
2479
                                    lace_size[n] = size / laces;
2480
                                break;
2481

    
2482
                            case 0x3: /* EBML lacing */ {
2483
                                uint32_t total;
2484
                                n = matroska_ebmlnum_uint(data, size, &num);
2485
                                if (n < 0) {
2486
                                    av_log(matroska->ctx, AV_LOG_INFO,
2487
                                           "EBML block data error\n");
2488
                                    break;
2489
                                }
2490
                                data += n;
2491
                                size -= n;
2492
                                total = lace_size[0] = num;
2493
                                for (n = 1; res == 0 && n < laces - 1; n++) {
2494
                                    int64_t snum;
2495
                                    int r;
2496
                                    r = matroska_ebmlnum_sint (data, size,
2497
                                                               &snum);
2498
                                    if (r < 0) {
2499
                                        av_log(matroska->ctx, AV_LOG_INFO,
2500
                                               "EBML block data error\n");
2501
                                        break;
2502
                                    }
2503
                                    data += r;
2504
                                    size -= r;
2505
                                    lace_size[n] = lace_size[n - 1] + snum;
2506
                                    total += lace_size[n];
2507
                                }
2508
                                lace_size[n] = size - total;
2509
                                break;
2510
                            }
2511
                        }
2512
                        break;
2513
                }
2514

    
2515
                if (res == 0) {
2516
                    for (n = 0; n < laces; n++) {
2517
                        uint64_t timecode = 0;
2518

    
2519
                        pkt = av_mallocz(sizeof(AVPacket));
2520
                        /* XXX: prevent data copy... */
2521
                        if (av_new_packet(pkt,lace_size[n]) < 0) {
2522
                            res = AVERROR_NOMEM;
2523
                            break;
2524
                        }
2525
                        if (cluster_time != (uint64_t)-1) {
2526
                            if (time < 0 && (-time) > cluster_time)
2527
                                timecode = cluster_time;
2528
                            else
2529
                                timecode = cluster_time + time;
2530
                        }
2531
                        /* FIXME: duration */
2532

    
2533
                        memcpy(pkt->data, data, lace_size[n]);
2534
                        data += lace_size[n];
2535
                        if (n == 0)
2536
                            pkt->flags = is_keyframe;
2537
                        pkt->stream_index =
2538
                            matroska->tracks[track]->stream_index;
2539

    
2540
                        pkt->pts = timecode / 1000000; /* ns to ms */
2541

    
2542
                        matroska_queue_packet(matroska, pkt);
2543
                    }
2544
                }
2545

    
2546
                av_free(lace_size);
2547
                av_free(origdata);
2548
                break;
2549
            }
2550

    
2551
            case MATROSKA_ID_BLOCKDURATION: {
2552
                uint64_t num;
2553
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2554
                    break;
2555
                av_log(matroska->ctx, AV_LOG_INFO,
2556
                       "FIXME: implement support for BlockDuration\n");
2557
                break;
2558
            }
2559

    
2560
            case MATROSKA_ID_BLOCKREFERENCE:
2561
                /* We've found a reference, so not even the first frame in
2562
                 * the lace is a key frame. */
2563
                is_keyframe = 0;
2564
                if (last_num_packets != matroska->num_packets)
2565
                    matroska->packets[last_num_packets]->flags = 0;
2566
                res = ebml_read_skip(matroska);
2567
                break;
2568

    
2569
            default:
2570
                av_log(matroska->ctx, AV_LOG_INFO,
2571
                       "Unknown entry 0x%x in blockgroup data\n", id);
2572
                /* fall-through */
2573

    
2574
            case EBML_ID_VOID:
2575
                res = ebml_read_skip(matroska);
2576
                break;
2577
        }
2578

    
2579
        if (matroska->level_up) {
2580
            matroska->level_up--;
2581
            break;
2582
        }
2583
    }
2584

    
2585
    return res;
2586
}
2587

    
2588
static int
2589
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2590
{
2591
    int res = 0;
2592
    uint32_t id;
2593
    uint64_t cluster_time = 0;
2594

    
2595
    av_log(matroska->ctx, AV_LOG_DEBUG,
2596
           "parsing cluster at %lld\n", url_ftell(&matroska->ctx->pb));
2597

    
2598
    while (res == 0) {
2599
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2600
            res = AVERROR_IO;
2601
            break;
2602
        } else if (matroska->level_up) {
2603
            matroska->level_up--;
2604
            break;
2605
        }
2606

    
2607
        switch (id) {
2608
            /* cluster timecode */
2609
            case MATROSKA_ID_CLUSTERTIMECODE: {
2610
                uint64_t num;
2611
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2612
                    break;
2613
                cluster_time = num * matroska->time_scale;
2614
                break;
2615
            }
2616

    
2617
                /* a group of blocks inside a cluster */
2618
            case MATROSKA_ID_BLOCKGROUP:
2619
                if ((res = ebml_read_master(matroska, &id)) < 0)
2620
                    break;
2621
                res = matroska_parse_blockgroup(matroska, cluster_time);
2622
                break;
2623

    
2624
            default:
2625
                av_log(matroska->ctx, AV_LOG_INFO,
2626
                       "Unknown entry 0x%x in cluster data\n", id);
2627
                /* fall-through */
2628

    
2629
            case EBML_ID_VOID:
2630
                res = ebml_read_skip(matroska);
2631
                break;
2632
        }
2633

    
2634
        if (matroska->level_up) {
2635
            matroska->level_up--;
2636
            break;
2637
        }
2638
    }
2639

    
2640
    return res;
2641
}
2642

    
2643
static int
2644
matroska_read_packet (AVFormatContext *s,
2645
                      AVPacket        *pkt)
2646
{
2647
    MatroskaDemuxContext *matroska = s->priv_data;
2648
    int res = 0;
2649
    uint32_t id;
2650

    
2651
    /* Do we still have a packet queued? */
2652
    if (matroska_deliver_packet(matroska, pkt) == 0)
2653
        return 0;
2654

    
2655
    /* Have we already reached the end? */
2656
    if (matroska->done)
2657
        return AVERROR_IO;
2658

    
2659
    while (res == 0) {
2660
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2661
            res = AVERROR_IO;
2662
            break;
2663
        } else if (matroska->level_up) {
2664
            matroska->level_up--;
2665
            break;
2666
        }
2667

    
2668
        switch (id) {
2669
            case MATROSKA_ID_CLUSTER:
2670
                if ((res = ebml_read_master(matroska, &id)) < 0)
2671
                    break;
2672
                if ((res = matroska_parse_cluster(matroska)) == 0)
2673
                    res = 1; /* Parsed one cluster, let's get out. */
2674
                break;
2675

    
2676
            default:
2677
            case EBML_ID_VOID:
2678
                res = ebml_read_skip(matroska);
2679
                break;
2680
        }
2681

    
2682
        if (matroska->level_up) {
2683
            matroska->level_up--;
2684
            break;
2685
        }
2686
    }
2687

    
2688
    if (res == -1)
2689
        matroska->done = 1;
2690

    
2691
    return matroska_deliver_packet(matroska, pkt);
2692
}
2693

    
2694
static int
2695
matroska_read_close (AVFormatContext *s)
2696
{
2697
    MatroskaDemuxContext *matroska = s->priv_data;
2698
    int n = 0;
2699

    
2700
    if (matroska->writing_app)
2701
        av_free(matroska->writing_app);
2702
    if (matroska->muxing_app)
2703
        av_free(matroska->muxing_app);
2704
    if (matroska->index)
2705
        av_free(matroska->index);
2706

    
2707
    if (matroska->packets != NULL) {
2708
        for (n = 0; n < matroska->num_packets; n++) {
2709
            av_free_packet(matroska->packets[n]);
2710
            av_free(matroska->packets[n]);
2711
        }
2712
        av_free(matroska->packets);
2713
    }
2714

    
2715
    for (n = 0; n < matroska->num_tracks; n++) {
2716
        MatroskaTrack *track = matroska->tracks[n];
2717
        if (track->codec_id)
2718
            av_free(track->codec_id);
2719
        if (track->codec_name)
2720
            av_free(track->codec_name);
2721
        if (track->codec_priv)
2722
            av_free(track->codec_priv);
2723
        if (track->name)
2724
            av_free(track->name);
2725
        if (track->language)
2726
            av_free(track->language);
2727

    
2728
        av_free(track);
2729
    }
2730

    
2731
    for (n = 0; n < s->nb_streams; n++) {
2732
        av_free(s->streams[n]->codec.extradata);
2733
    }
2734

    
2735
    memset(matroska, 0, sizeof(MatroskaDemuxContext));
2736

    
2737
    return 0;
2738
}
2739

    
2740
static AVInputFormat matroska_iformat = {
2741
    "matroska",
2742
    "Matroska file format",
2743
    sizeof(MatroskaDemuxContext),
2744
    matroska_probe,
2745
    matroska_read_header,
2746
    matroska_read_packet,
2747
    matroska_read_close,
2748
};
2749

    
2750
int
2751
matroska_init(void)
2752
{
2753
    av_register_input_format(&matroska_iformat);
2754
    return 0;
2755
}