Statistics
| Branch: | Revision:

ffmpeg / libavformat / matroska.c @ 916bf03a

History | View | Annotate | Download (90.2 KB)

1
/*
2
 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 The ffmpeg Project
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file matroska.c
24
 * Matroska file demuxer
25
 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
26
 * with a little help from Moritz Bunkus <moritz@bunkus.org>
27
 * Specs available on the matroska project page:
28
 * http://www.matroska.org/.
29
 */
30

    
31
#include "avformat.h"
32
/* For codec_get_id(). */
33
#include "riff.h"
34
#include "intfloat_readwrite.h"
35

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
139
/* IDs in the cluster master */
140
#define MATROSKA_ID_CLUSTERTIMECODE 0xE7
141
#define MATROSKA_ID_BLOCKGROUP 0xA0
142
#define MATROSKA_ID_SIMPLEBLOCK 0xA3
143

    
144
/* IDs in the blockgroup master */
145
#define MATROSKA_ID_BLOCK      0xA1
146
#define MATROSKA_ID_BLOCKDURATION 0x9B
147
#define MATROSKA_ID_BLOCKREFERENCE 0xFB
148

    
149
typedef enum {
150
  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
151
  MATROSKA_TRACK_TYPE_AUDIO    = 0x2,
152
  MATROSKA_TRACK_TYPE_COMPLEX  = 0x3,
153
  MATROSKA_TRACK_TYPE_LOGO     = 0x10,
154
  MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
155
  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
156
} MatroskaTrackType;
157

    
158
typedef enum {
159
  MATROSKA_EYE_MODE_MONO  = 0x0,
160
  MATROSKA_EYE_MODE_RIGHT = 0x1,
161
  MATROSKA_EYE_MODE_LEFT  = 0x2,
162
  MATROSKA_EYE_MODE_BOTH  = 0x3,
163
} MatroskaEyeMode;
164

    
165
typedef enum {
166
  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
167
  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
168
  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
169
} MatroskaAspectRatioMode;
170

    
171
/*
172
 * These aren't in any way "matroska-form" things,
173
 * it's just something I use in the muxer/demuxer.
174
 */
175

    
176
typedef enum {
177
  MATROSKA_TRACK_ENABLED = (1<<0),
178
  MATROSKA_TRACK_DEFAULT = (1<<1),
179
  MATROSKA_TRACK_LACING  = (1<<2),
180
  MATROSKA_TRACK_REAL_V  = (1<<4),
181
  MATROSKA_TRACK_REORDER = (1<<8),
182
  MATROSKA_TRACK_SHIFT   = (1<<16)
183
} MatroskaTrackFlags;
184

    
185
typedef enum {
186
  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
187
} MatroskaVideoTrackFlags;
188

    
189
/*
190
 * Matroska Codec IDs. Strings.
191
 */
192

    
193
typedef struct CodecTags{
194
    const char *str;
195
    enum CodecID id;
196
}CodecTags;
197

    
198
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
199
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
200

    
201
static CodecTags codec_tags[]={
202
//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
203
    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
204
    {"V_MPEG4/ISO/SP"   , CODEC_ID_MPEG4},
205
    {"V_MPEG4/ISO/ASP"  , CODEC_ID_MPEG4},
206
    {"V_MPEG4/ISO/AP"   , CODEC_ID_MPEG4},
207
    {"V_MPEG4/ISO/AVC"  , CODEC_ID_H264},
208
    {"V_MPEG4/MS/V3"    , CODEC_ID_MSMPEG4V3},
209
    {"V_MPEG1"          , CODEC_ID_MPEG1VIDEO},
210
    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
211
    {"V_MJPEG"          , CODEC_ID_MJPEG},
212
    {"V_REAL/RV10"      , CODEC_ID_RV10},
213
    {"V_REAL/RV20"      , CODEC_ID_RV20},
214
    {"V_REAL/RV30"      , CODEC_ID_RV30},
215
    {"V_REAL/RV40"      , CODEC_ID_RV40},
216
/* TODO: Real/Quicktime */
217

    
218
//    {"A_MS/ACM"         , CODEC_ID_NONE},
219
    {"A_MPEG/L1"        , CODEC_ID_MP3},
220
    {"A_MPEG/L2"        , CODEC_ID_MP3},
221
    {"A_MPEG/L3"        , CODEC_ID_MP3},
222
    {"A_PCM/INT/BIG"    , CODEC_ID_PCM_U16BE},
223
    {"A_PCM/INT/LIT"    , CODEC_ID_PCM_U16LE},
224
//    {"A_PCM/FLOAT/IEEE" , CODEC_ID_NONE},
225
    {"A_AC3"            , CODEC_ID_AC3},
226
    {"A_DTS"            , CODEC_ID_DTS},
227
    {"A_VORBIS"         , CODEC_ID_VORBIS},
228
    {"A_AAC"            , CODEC_ID_AAC},
229
    {"A_FLAC"           , CODEC_ID_FLAC},
230
    {"A_WAVPACK4"       , CODEC_ID_WAVPACK},
231
    {"A_TTA1"           , CODEC_ID_TTA},
232
    {NULL               , CODEC_ID_NONE}
233
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
234
};
235

    
236
/* max. depth in the EBML tree structure */
237
#define EBML_MAX_DEPTH 16
238

    
239
typedef struct Track {
240
    MatroskaTrackType type;
241

    
242
    /* Unique track number and track ID. stream_index is the index that
243
     * the calling app uses for this track. */
244
    uint32_t num,
245
        uid,
246
        stream_index;
247

    
248
    char *name,
249
        *language;
250

    
251
    char *codec_id,
252
        *codec_name;
253

    
254
    unsigned char *codec_priv;
255
    int codec_priv_size;
256

    
257
    int64_t default_duration;
258
    MatroskaTrackFlags flags;
259
} MatroskaTrack;
260

    
261
typedef struct MatroskaVideoTrack {
262
    MatroskaTrack track;
263

    
264
    int pixel_width,
265
        pixel_height,
266
        display_width,
267
        display_height;
268

    
269
    uint32_t fourcc;
270

    
271
    MatroskaAspectRatioMode ar_mode;
272
    MatroskaEyeMode eye_mode;
273

    
274
    //..
275
} MatroskaVideoTrack;
276

    
277
typedef struct MatroskaAudioTrack {
278
    MatroskaTrack track;
279

    
280
    int channels,
281
        bitdepth,
282
        internal_samplerate,
283
        samplerate;
284
    //..
285
} MatroskaAudioTrack;
286

    
287
typedef struct MatroskaSubtitleTrack {
288
    MatroskaTrack track;
289

    
290
    //..
291
} MatroskaSubtitleTrack;
292

    
293
#define MAX_TRACK_SIZE (FFMAX(FFMAX(sizeof(MatroskaVideoTrack), \
294
                                    sizeof(MatroskaAudioTrack)), \
295
                                    sizeof(MatroskaSubtitleTrack)))
296

    
297
typedef struct MatroskaLevel {
298
    uint64_t start, length;
299
} MatroskaLevel;
300

    
301
typedef struct MatroskaDemuxIndex {
302
  uint64_t        pos;   /* of the corresponding *cluster*! */
303
  uint16_t        track; /* reference to 'num' */
304
  uint64_t        time;  /* in nanoseconds */
305
} MatroskaDemuxIndex;
306

    
307
typedef struct MatroskaDemuxContext {
308
    AVFormatContext *ctx;
309

    
310
    /* ebml stuff */
311
    int num_levels;
312
    MatroskaLevel levels[EBML_MAX_DEPTH];
313
    int level_up;
314

    
315
    /* matroska stuff */
316
    char *writing_app,
317
        *muxing_app;
318
    int64_t created;
319

    
320
    /* timescale in the file */
321
    int64_t time_scale;
322

    
323
    /* position (time, ns) */
324
    int64_t pos;
325

    
326
    /* num_streams is the number of streams that av_new_stream() was called
327
     * for ( = that are available to the calling program). */
328
    int num_tracks, num_streams;
329
    MatroskaTrack *tracks[MAX_STREAMS];
330

    
331
    /* cache for ID peeking */
332
    uint32_t peek_id;
333

    
334
    /* byte position of the segment inside the stream */
335
    offset_t segment_start;
336

    
337
    /* The packet queue. */
338
    AVPacket **packets;
339
    int num_packets;
340
    /* Second packet queue used to reorder pts of some video track. */
341
    AVPacket **packets_reorder;
342
    int num_packets_reorder;
343
    uint64_t reorder_max_pts;
344

    
345
    /* have we already parse metadata/cues/clusters? */
346
    int metadata_parsed,
347
        index_parsed,
348
        done;
349

    
350
    /* The index for seeking. */
351
    int num_indexes;
352
    MatroskaDemuxIndex *index;
353
} MatroskaDemuxContext;
354

    
355
/*
356
 * The first few functions handle EBML file parsing. The rest
357
 * is the document interpretation. Matroska really just is a
358
 * EBML file.
359
 */
360

    
361
/*
362
 * Return: the amount of levels in the hierarchy that the
363
 * current element lies higher than the previous one.
364
 * The opposite isn't done - that's auto-done using master
365
 * element reading.
366
 */
367

    
368
static int
369
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
370
{
371
    ByteIOContext *pb = &matroska->ctx->pb;
372
    offset_t pos = url_ftell(pb);
373
    int num = 0;
374

    
375
    while (matroska->num_levels > 0) {
376
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
377

    
378
        if (pos >= level->start + level->length) {
379
            matroska->num_levels--;
380
            num++;
381
        } else {
382
            break;
383
        }
384
    }
385

    
386
    return num;
387
}
388

    
389
/*
390
 * Read: an "EBML number", which is defined as a variable-length
391
 * array of bytes. The first byte indicates the length by giving a
392
 * number of 0-bits followed by a one. The position of the first
393
 * "one" bit inside the first byte indicates the length of this
394
 * number.
395
 * Returns: num. of bytes read. < 0 on error.
396
 */
397

    
398
static int
399
ebml_read_num (MatroskaDemuxContext *matroska,
400
               int                   max_size,
401
               uint64_t             *number)
402
{
403
    ByteIOContext *pb = &matroska->ctx->pb;
404
    int len_mask = 0x80, read = 1, n = 1;
405
    int64_t total = 0;
406

    
407
    /* the first byte tells us the length in bytes - get_byte() can normally
408
     * return 0, but since that's not a valid first ebmlID byte, we can
409
     * use it safely here to catch EOS. */
410
    if (!(total = get_byte(pb))) {
411
        /* we might encounter EOS here */
412
        if (!url_feof(pb)) {
413
            offset_t pos = url_ftell(pb);
414
            av_log(matroska->ctx, AV_LOG_ERROR,
415
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
416
                   pos, pos);
417
        }
418
        return AVERROR_IO; /* EOS or actual I/O error */
419
    }
420

    
421
    /* get the length of the EBML number */
422
    while (read <= max_size && !(total & len_mask)) {
423
        read++;
424
        len_mask >>= 1;
425
    }
426
    if (read > max_size) {
427
        offset_t pos = url_ftell(pb) - 1;
428
        av_log(matroska->ctx, AV_LOG_ERROR,
429
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
430
               (uint8_t) total, pos, pos);
431
        return AVERROR_INVALIDDATA;
432
    }
433

    
434
    /* read out length */
435
    total &= ~len_mask;
436
    while (n++ < read)
437
        total = (total << 8) | get_byte(pb);
438

    
439
    *number = total;
440

    
441
    return read;
442
}
443

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

    
449
static int
450
ebml_read_element_id (MatroskaDemuxContext *matroska,
451
                      uint32_t             *id,
452
                      int                  *level_up)
453
{
454
    int read;
455
    uint64_t total;
456

    
457
    /* if we re-call this, use our cached ID */
458
    if (matroska->peek_id != 0) {
459
        if (level_up)
460
            *level_up = 0;
461
        *id = matroska->peek_id;
462
        return 0;
463
    }
464

    
465
    /* read out the "EBML number", include tag in ID */
466
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
467
        return read;
468
    *id = matroska->peek_id  = total | (1 << (read * 7));
469

    
470
    /* level tracking */
471
    if (level_up)
472
        *level_up = ebml_read_element_level_up(matroska);
473

    
474
    return read;
475
}
476

    
477
/*
478
 * Read: element content length.
479
 * Return: the number of bytes read or < 0 on error.
480
 */
481

    
482
static int
483
ebml_read_element_length (MatroskaDemuxContext *matroska,
484
                          uint64_t             *length)
485
{
486
    /* clear cache since we're now beyond that data point */
487
    matroska->peek_id = 0;
488

    
489
    /* read out the "EBML number", include tag in ID */
490
    return ebml_read_num(matroska, 8, length);
491
}
492

    
493
/*
494
 * Return: the ID of the next element, or 0 on error.
495
 * Level_up contains the amount of levels that this
496
 * next element lies higher than the previous one.
497
 */
498

    
499
static uint32_t
500
ebml_peek_id (MatroskaDemuxContext *matroska,
501
              int                  *level_up)
502
{
503
    uint32_t id;
504

    
505
    assert(level_up != NULL);
506

    
507
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
508
        return 0;
509

    
510
    return id;
511
}
512

    
513
/*
514
 * Seek to a given offset.
515
 * 0 is success, -1 is failure.
516
 */
517

    
518
static int
519
ebml_read_seek (MatroskaDemuxContext *matroska,
520
                offset_t              offset)
521
{
522
    ByteIOContext *pb = &matroska->ctx->pb;
523

    
524
    /* clear ID cache, if any */
525
    matroska->peek_id = 0;
526

    
527
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
528
}
529

    
530
/*
531
 * Skip the next element.
532
 * 0 is success, -1 is failure.
533
 */
534

    
535
static int
536
ebml_read_skip (MatroskaDemuxContext *matroska)
537
{
538
    ByteIOContext *pb = &matroska->ctx->pb;
539
    uint32_t id;
540
    uint64_t length;
541
    int res;
542

    
543
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
544
        (res = ebml_read_element_length(matroska, &length)) < 0)
545
        return res;
546

    
547
    url_fskip(pb, length);
548

    
549
    return 0;
550
}
551

    
552
/*
553
 * Read the next element as an unsigned int.
554
 * 0 is success, < 0 is failure.
555
 */
556

    
557
static int
558
ebml_read_uint (MatroskaDemuxContext *matroska,
559
                uint32_t             *id,
560
                uint64_t             *num)
561
{
562
    ByteIOContext *pb = &matroska->ctx->pb;
563
    int n = 0, size, res;
564
    uint64_t rlength;
565

    
566
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
567
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
568
        return res;
569
    size = rlength;
570
    if (size < 1 || size > 8) {
571
        offset_t pos = url_ftell(pb);
572
        av_log(matroska->ctx, AV_LOG_ERROR,
573
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
574
                size, pos, pos);
575
        return AVERROR_INVALIDDATA;
576
    }
577

    
578
    /* big-endian ordening; build up number */
579
    *num = 0;
580
    while (n++ < size)
581
        *num = (*num << 8) | get_byte(pb);
582

    
583
    return 0;
584
}
585

    
586
/*
587
 * Read the next element as a signed int.
588
 * 0 is success, < 0 is failure.
589
 */
590

    
591
static int
592
ebml_read_sint (MatroskaDemuxContext *matroska,
593
                uint32_t             *id,
594
                int64_t              *num)
595
{
596
    ByteIOContext *pb = &matroska->ctx->pb;
597
    int size, n = 1, negative = 0, res;
598
    uint64_t rlength;
599

    
600
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
601
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
602
        return res;
603
    size = rlength;
604
    if (size < 1 || size > 8) {
605
        offset_t pos = url_ftell(pb);
606
        av_log(matroska->ctx, AV_LOG_ERROR,
607
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
608
                size, pos, pos);
609
        return AVERROR_INVALIDDATA;
610
    }
611
    if ((*num = get_byte(pb)) & 0x80) {
612
        negative = 1;
613
        *num &= ~0x80;
614
    }
615
    while (n++ < size)
616
        *num = (*num << 8) | get_byte(pb);
617

    
618
    /* make signed */
619
    if (negative)
620
        *num = *num - (1LL << ((8 * size) - 1));
621

    
622
    return 0;
623
}
624

    
625
/*
626
 * Read the next element as a float.
627
 * 0 is success, < 0 is failure.
628
 */
629

    
630
static int
631
ebml_read_float (MatroskaDemuxContext *matroska,
632
                 uint32_t             *id,
633
                 double               *num)
634
{
635
    ByteIOContext *pb = &matroska->ctx->pb;
636
    int size, res;
637
    uint64_t rlength;
638

    
639
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
640
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
641
        return res;
642
    size = rlength;
643

    
644
    if (size == 4) {
645
        *num= av_int2flt(get_be32(pb));
646
    } else if(size==8){
647
        *num= av_int2dbl(get_be64(pb));
648
    } else{
649
        offset_t pos = url_ftell(pb);
650
        av_log(matroska->ctx, AV_LOG_ERROR,
651
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
652
               size, pos, pos);
653
        return AVERROR_INVALIDDATA;
654
    }
655

    
656
    return 0;
657
}
658

    
659
/*
660
 * Read the next element as an ASCII string.
661
 * 0 is success, < 0 is failure.
662
 */
663

    
664
static int
665
ebml_read_ascii (MatroskaDemuxContext *matroska,
666
                 uint32_t             *id,
667
                 char                **str)
668
{
669
    ByteIOContext *pb = &matroska->ctx->pb;
670
    int size, res;
671
    uint64_t rlength;
672

    
673
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
674
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
675
        return res;
676
    size = rlength;
677

    
678
    /* ebml strings are usually not 0-terminated, so we allocate one
679
     * byte more, read the string and NULL-terminate it ourselves. */
680
    if (size < 0 || !(*str = av_malloc(size + 1))) {
681
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
682
        return AVERROR_NOMEM;
683
    }
684
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
685
        offset_t pos = url_ftell(pb);
686
        av_log(matroska->ctx, AV_LOG_ERROR,
687
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
688
        return AVERROR_IO;
689
    }
690
    (*str)[size] = '\0';
691

    
692
    return 0;
693
}
694

    
695
/*
696
 * Read the next element as a UTF-8 string.
697
 * 0 is success, < 0 is failure.
698
 */
699

    
700
static int
701
ebml_read_utf8 (MatroskaDemuxContext *matroska,
702
                uint32_t             *id,
703
                char                **str)
704
{
705
  return ebml_read_ascii(matroska, id, str);
706
}
707

    
708
/*
709
 * Read the next element as a date (nanoseconds since 1/1/2000).
710
 * 0 is success, < 0 is failure.
711
 */
712

    
713
static int
714
ebml_read_date (MatroskaDemuxContext *matroska,
715
                uint32_t             *id,
716
                int64_t              *date)
717
{
718
  return ebml_read_sint(matroska, id, date);
719
}
720

    
721
/*
722
 * Read the next element, but only the header. The contents
723
 * are supposed to be sub-elements which can be read separately.
724
 * 0 is success, < 0 is failure.
725
 */
726

    
727
static int
728
ebml_read_master (MatroskaDemuxContext *matroska,
729
                  uint32_t             *id)
730
{
731
    ByteIOContext *pb = &matroska->ctx->pb;
732
    uint64_t length;
733
    MatroskaLevel *level;
734
    int res;
735

    
736
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
737
        (res = ebml_read_element_length(matroska, &length)) < 0)
738
        return res;
739

    
740
    /* protect... (Heaven forbids that the '>' is true) */
741
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
742
        av_log(matroska->ctx, AV_LOG_ERROR,
743
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
744
        return AVERROR_NOTSUPP;
745
    }
746

    
747
    /* remember level */
748
    level = &matroska->levels[matroska->num_levels++];
749
    level->start = url_ftell(pb);
750
    level->length = length;
751

    
752
    return 0;
753
}
754

    
755
/*
756
 * Read the next element as binary data.
757
 * 0 is success, < 0 is failure.
758
 */
759

    
760
static int
761
ebml_read_binary (MatroskaDemuxContext *matroska,
762
                  uint32_t             *id,
763
                  uint8_t             **binary,
764
                  int                  *size)
765
{
766
    ByteIOContext *pb = &matroska->ctx->pb;
767
    uint64_t rlength;
768
    int res;
769

    
770
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
771
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
772
        return res;
773
    *size = rlength;
774

    
775
    if (!(*binary = av_malloc(*size))) {
776
        av_log(matroska->ctx, AV_LOG_ERROR,
777
               "Memory allocation error\n");
778
        return AVERROR_NOMEM;
779
    }
780

    
781
    if (get_buffer(pb, *binary, *size) != *size) {
782
        offset_t pos = url_ftell(pb);
783
        av_log(matroska->ctx, AV_LOG_ERROR,
784
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
785
        return AVERROR_IO;
786
    }
787

    
788
    return 0;
789
}
790

    
791
/*
792
 * Read signed/unsigned "EBML" numbers.
793
 * Return: number of bytes processed, < 0 on error.
794
 * XXX: use ebml_read_num().
795
 */
796

    
797
static int
798
matroska_ebmlnum_uint (uint8_t  *data,
799
                       uint32_t  size,
800
                       uint64_t *num)
801
{
802
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
803
    uint64_t total;
804

    
805
    if (size <= 0)
806
        return AVERROR_INVALIDDATA;
807

    
808
    total = data[0];
809
    while (read <= 8 && !(total & len_mask)) {
810
        read++;
811
        len_mask >>= 1;
812
    }
813
    if (read > 8)
814
        return AVERROR_INVALIDDATA;
815

    
816
    if ((total &= (len_mask - 1)) == len_mask - 1)
817
        num_ffs++;
818
    if (size < read)
819
        return AVERROR_INVALIDDATA;
820
    while (n < read) {
821
        if (data[n] == 0xff)
822
            num_ffs++;
823
        total = (total << 8) | data[n];
824
        n++;
825
    }
826

    
827
    if (read == num_ffs)
828
        *num = (uint64_t)-1;
829
    else
830
        *num = total;
831

    
832
    return read;
833
}
834

    
835
/*
836
 * Same as above, but signed.
837
 */
838

    
839
static int
840
matroska_ebmlnum_sint (uint8_t  *data,
841
                       uint32_t  size,
842
                       int64_t  *num)
843
{
844
    uint64_t unum;
845
    int res;
846

    
847
    /* read as unsigned number first */
848
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
849
        return res;
850

    
851
    /* make signed (weird way) */
852
    if (unum == (uint64_t)-1)
853
        *num = INT64_MAX;
854
    else
855
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
856

    
857
    return res;
858
}
859

    
860
/*
861
 * Read an EBML header.
862
 * 0 is success, < 0 is failure.
863
 */
864

    
865
static int
866
ebml_read_header (MatroskaDemuxContext *matroska,
867
                  char                **doctype,
868
                  int                  *version)
869
{
870
    uint32_t id;
871
    int level_up, res = 0;
872

    
873
    /* default init */
874
    if (doctype)
875
        *doctype = NULL;
876
    if (version)
877
        *version = 1;
878

    
879
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
880
        level_up != 0 || id != EBML_ID_HEADER) {
881
        av_log(matroska->ctx, AV_LOG_ERROR,
882
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
883
        return AVERROR_INVALIDDATA;
884
    }
885
    if ((res = ebml_read_master(matroska, &id)) < 0)
886
        return res;
887

    
888
    while (res == 0) {
889
        if (!(id = ebml_peek_id(matroska, &level_up)))
890
            return AVERROR_IO;
891

    
892
        /* end-of-header */
893
        if (level_up)
894
            break;
895

    
896
        switch (id) {
897
            /* is our read version uptodate? */
898
            case EBML_ID_EBMLREADVERSION: {
899
                uint64_t num;
900

    
901
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
902
                    return res;
903
                if (num > EBML_VERSION) {
904
                    av_log(matroska->ctx, AV_LOG_ERROR,
905
                           "EBML version %"PRIu64" (> %d) is not supported\n",
906
                           num, EBML_VERSION);
907
                    return AVERROR_INVALIDDATA;
908
                }
909
                break;
910
            }
911

    
912
            /* we only handle 8 byte lengths at max */
913
            case EBML_ID_EBMLMAXSIZELENGTH: {
914
                uint64_t num;
915

    
916
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
917
                    return res;
918
                if (num > sizeof(uint64_t)) {
919
                    av_log(matroska->ctx, AV_LOG_ERROR,
920
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
921
                           num, sizeof(uint64_t));
922
                    return AVERROR_INVALIDDATA;
923
                }
924
                break;
925
            }
926

    
927
            /* we handle 4 byte IDs at max */
928
            case EBML_ID_EBMLMAXIDLENGTH: {
929
                uint64_t num;
930

    
931
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
932
                    return res;
933
                if (num > sizeof(uint32_t)) {
934
                    av_log(matroska->ctx, AV_LOG_ERROR,
935
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
936
                            num, sizeof(uint32_t));
937
                    return AVERROR_INVALIDDATA;
938
                }
939
                break;
940
            }
941

    
942
            case EBML_ID_DOCTYPE: {
943
                char *text;
944

    
945
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
946
                    return res;
947
                if (doctype) {
948
                    if (*doctype)
949
                        av_free(*doctype);
950
                    *doctype = text;
951
                } else
952
                    av_free(text);
953
                break;
954
            }
955

    
956
            case EBML_ID_DOCTYPEREADVERSION: {
957
                uint64_t num;
958

    
959
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
960
                    return res;
961
                if (version)
962
                    *version = num;
963
                break;
964
            }
965

    
966
            default:
967
                av_log(matroska->ctx, AV_LOG_INFO,
968
                       "Unknown data type 0x%x in EBML header", id);
969
                /* pass-through */
970

    
971
            case EBML_ID_VOID:
972
            /* we ignore these two, as they don't tell us anything we
973
             * care about */
974
            case EBML_ID_EBMLVERSION:
975
            case EBML_ID_DOCTYPEVERSION:
976
                res = ebml_read_skip (matroska);
977
                break;
978
        }
979
    }
980

    
981
    return 0;
982
}
983

    
984
/*
985
 * Put one packet in an application-supplied AVPacket struct.
986
 * Returns 0 on success or -1 on failure.
987
 */
988

    
989
static int
990
matroska_deliver_packet (MatroskaDemuxContext *matroska,
991
                         AVPacket             *pkt)
992
{
993
    if (matroska->num_packets > 0) {
994
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
995
        av_free(matroska->packets[0]);
996
        if (matroska->num_packets > 1) {
997
            memmove(&matroska->packets[0], &matroska->packets[1],
998
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
999
            matroska->packets =
1000
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1001
                           sizeof(AVPacket *));
1002
        } else {
1003
            av_freep(&matroska->packets);
1004
        }
1005
        matroska->num_packets--;
1006
        return 0;
1007
    }
1008

    
1009
    return -1;
1010
}
1011

    
1012
/*
1013
 * Put a packet into our internal queue. Will be delivered to the
1014
 * user/application during the next get_packet() call.
1015
 */
1016

    
1017
static void
1018
matroska_queue_packet (MatroskaDemuxContext *matroska,
1019
                       AVPacket             *pkt)
1020
{
1021
    matroska->packets =
1022
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1023
                   sizeof(AVPacket *));
1024
    matroska->packets[matroska->num_packets] = pkt;
1025
    matroska->num_packets++;
1026
}
1027

    
1028
/*
1029
 * Put a packet into our internal reordering queue. Will be moved to the
1030
 * main packet queue when enough packets are available to reorder pts.
1031
 */
1032

    
1033
static void
1034
matroska_queue_packet_reordered (MatroskaDemuxContext *matroska,
1035
                                 AVPacket             *pkt,
1036
                                 int                   is_bframe)
1037
{
1038
    if (matroska->num_packets_reorder && !is_bframe
1039
        && pkt->pts > matroska->reorder_max_pts) {
1040
        /* reorder pts */
1041
        int i, j, k = 1;
1042
        for (j=matroska->num_packets_reorder-1; j && k; j--) {
1043
            k = 0;
1044
            for (i=0; i<j; i++) {
1045
                if (matroska->packets_reorder[i]->pts > matroska->packets_reorder[i+1]->pts) {
1046
                    FFSWAP(uint64_t, matroska->packets_reorder[i]->pts, matroska->packets_reorder[i+1]->pts);
1047
                    k = 1;
1048
                }
1049
            }
1050
        }
1051
        /* then really queue the packets */
1052
        for (i=0; i<matroska->num_packets_reorder; i++)
1053
            matroska_queue_packet (matroska, matroska->packets_reorder[i]);
1054
        matroska->num_packets_reorder = 0;
1055
    }
1056
    matroska->packets_reorder =
1057
        av_realloc(matroska->packets_reorder,
1058
                   (matroska->num_packets_reorder + 1) * sizeof(AVPacket *));
1059
    matroska->packets_reorder[matroska->num_packets_reorder++] = pkt;
1060
    if (pkt->pts > matroska->reorder_max_pts)
1061
        matroska->reorder_max_pts = pkt->pts;
1062
}
1063

    
1064

    
1065
/*
1066
 * Autodetecting...
1067
 */
1068

    
1069
static int
1070
matroska_probe (AVProbeData *p)
1071
{
1072
    uint64_t total = 0;
1073
    int len_mask = 0x80, size = 1, n = 1;
1074
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1075

    
1076
    if (p->buf_size < 5)
1077
        return 0;
1078

    
1079
    /* ebml header? */
1080
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1081
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1082
        return 0;
1083

    
1084
    /* length of header */
1085
    total = p->buf[4];
1086
    while (size <= 8 && !(total & len_mask)) {
1087
        size++;
1088
        len_mask >>= 1;
1089
    }
1090
    if (size > 8)
1091
      return 0;
1092
    total &= (len_mask - 1);
1093
    while (n < size)
1094
        total = (total << 8) | p->buf[4 + n++];
1095

    
1096
    /* does the probe data contain the whole header? */
1097
    if (p->buf_size < 4 + size + total)
1098
      return 0;
1099

    
1100
    /* the header must contain the document type 'matroska'. For now,
1101
     * we don't parse the whole header but simply check for the
1102
     * availability of that array of characters inside the header.
1103
     * Not fully fool-proof, but good enough. */
1104
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
1105
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1106
            return AVPROBE_SCORE_MAX;
1107

    
1108
    return 0;
1109
}
1110

    
1111
/*
1112
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1113
 */
1114

    
1115
static int
1116
matroska_parse_info (MatroskaDemuxContext *matroska)
1117
{
1118
    int res = 0;
1119
    uint32_t id;
1120

    
1121
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1122

    
1123
    while (res == 0) {
1124
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1125
            res = AVERROR_IO;
1126
            break;
1127
        } else if (matroska->level_up) {
1128
            matroska->level_up--;
1129
            break;
1130
        }
1131

    
1132
        switch (id) {
1133
            /* cluster timecode */
1134
            case MATROSKA_ID_TIMECODESCALE: {
1135
                uint64_t num;
1136
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1137
                    break;
1138
                matroska->time_scale = num;
1139
                break;
1140
            }
1141

    
1142
            case MATROSKA_ID_DURATION: {
1143
                double num;
1144
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1145
                    break;
1146
                matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
1147
                break;
1148
            }
1149

    
1150
            case MATROSKA_ID_TITLE: {
1151
                char *text;
1152
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1153
                    break;
1154
                strncpy(matroska->ctx->title, text,
1155
                        sizeof(matroska->ctx->title)-1);
1156
                av_free(text);
1157
                break;
1158
            }
1159

    
1160
            case MATROSKA_ID_WRITINGAPP: {
1161
                char *text;
1162
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1163
                    break;
1164
                matroska->writing_app = text;
1165
                break;
1166
            }
1167

    
1168
            case MATROSKA_ID_MUXINGAPP: {
1169
                char *text;
1170
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1171
                    break;
1172
                matroska->muxing_app = text;
1173
                break;
1174
            }
1175

    
1176
            case MATROSKA_ID_DATEUTC: {
1177
                int64_t time;
1178
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1179
                    break;
1180
                matroska->created = time;
1181
                break;
1182
            }
1183

    
1184
            default:
1185
                av_log(matroska->ctx, AV_LOG_INFO,
1186
                       "Unknown entry 0x%x in info header\n", id);
1187
                /* fall-through */
1188

    
1189
            case EBML_ID_VOID:
1190
                res = ebml_read_skip(matroska);
1191
                break;
1192
        }
1193

    
1194
        if (matroska->level_up) {
1195
            matroska->level_up--;
1196
            break;
1197
        }
1198
    }
1199

    
1200
    return res;
1201
}
1202

    
1203
static int
1204
matroska_add_stream (MatroskaDemuxContext *matroska)
1205
{
1206
    int res = 0;
1207
    uint32_t id;
1208
    MatroskaTrack *track;
1209

    
1210
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1211

    
1212
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1213
    track = av_mallocz(MAX_TRACK_SIZE);
1214
    matroska->num_tracks++;
1215

    
1216
    /* start with the master */
1217
    if ((res = ebml_read_master(matroska, &id)) < 0)
1218
        return res;
1219

    
1220
    /* try reading the trackentry headers */
1221
    while (res == 0) {
1222
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1223
            res = AVERROR_IO;
1224
            break;
1225
        } else if (matroska->level_up > 0) {
1226
            matroska->level_up--;
1227
            break;
1228
        }
1229

    
1230
        switch (id) {
1231
            /* track number (unique stream ID) */
1232
            case MATROSKA_ID_TRACKNUMBER: {
1233
                uint64_t num;
1234
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1235
                    break;
1236
                track->num = num;
1237
                break;
1238
            }
1239

    
1240
            /* track UID (unique identifier) */
1241
            case MATROSKA_ID_TRACKUID: {
1242
                uint64_t num;
1243
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1244
                    break;
1245
                track->uid = num;
1246
                break;
1247
            }
1248

    
1249
            /* track type (video, audio, combined, subtitle, etc.) */
1250
            case MATROSKA_ID_TRACKTYPE: {
1251
                uint64_t num;
1252
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1253
                    break;
1254
                if (track->type && track->type != num) {
1255
                    av_log(matroska->ctx, AV_LOG_INFO,
1256
                           "More than one tracktype in an entry - skip\n");
1257
                    break;
1258
                }
1259
                track->type = num;
1260

    
1261
                switch (track->type) {
1262
                    case MATROSKA_TRACK_TYPE_VIDEO:
1263
                    case MATROSKA_TRACK_TYPE_AUDIO:
1264
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1265
                        break;
1266
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1267
                    case MATROSKA_TRACK_TYPE_LOGO:
1268
                    case MATROSKA_TRACK_TYPE_CONTROL:
1269
                    default:
1270
                        av_log(matroska->ctx, AV_LOG_INFO,
1271
                               "Unknown or unsupported track type 0x%x\n",
1272
                               track->type);
1273
                        track->type = 0;
1274
                        break;
1275
                }
1276
                matroska->tracks[matroska->num_tracks - 1] = track;
1277
                break;
1278
            }
1279

    
1280
            /* tracktype specific stuff for video */
1281
            case MATROSKA_ID_TRACKVIDEO: {
1282
                MatroskaVideoTrack *videotrack;
1283
                if (!track->type)
1284
                    track->type = MATROSKA_TRACK_TYPE_VIDEO;
1285
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1286
                    av_log(matroska->ctx, AV_LOG_INFO,
1287
                           "video data in non-video track - ignoring\n");
1288
                    res = AVERROR_INVALIDDATA;
1289
                    break;
1290
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1291
                    break;
1292
                videotrack = (MatroskaVideoTrack *)track;
1293

    
1294
                while (res == 0) {
1295
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1296
                        res = AVERROR_IO;
1297
                        break;
1298
                    } else if (matroska->level_up > 0) {
1299
                        matroska->level_up--;
1300
                        break;
1301
                    }
1302

    
1303
                    switch (id) {
1304
                        /* fixme, this should be one-up, but I get it here */
1305
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1306
                            uint64_t num;
1307
                            if ((res = ebml_read_uint (matroska, &id,
1308
                                                       &num)) < 0)
1309
                                break;
1310
                            track->default_duration = num;
1311
                            break;
1312
                        }
1313

    
1314
                        /* video framerate */
1315
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1316
                            double num;
1317
                            if ((res = ebml_read_float(matroska, &id,
1318
                                                       &num)) < 0)
1319
                                break;
1320
                            track->default_duration = 1000000000 * (1. / num);
1321
                            break;
1322
                        }
1323

    
1324
                        /* width of the size to display the video at */
1325
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1326
                            uint64_t num;
1327
                            if ((res = ebml_read_uint(matroska, &id,
1328
                                                      &num)) < 0)
1329
                                break;
1330
                            videotrack->display_width = num;
1331
                            break;
1332
                        }
1333

    
1334
                        /* height of the size to display the video at */
1335
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1336
                            uint64_t num;
1337
                            if ((res = ebml_read_uint(matroska, &id,
1338
                                                      &num)) < 0)
1339
                                break;
1340
                            videotrack->display_height = num;
1341
                            break;
1342
                        }
1343

    
1344
                        /* width of the video in the file */
1345
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1346
                            uint64_t num;
1347
                            if ((res = ebml_read_uint(matroska, &id,
1348
                                                      &num)) < 0)
1349
                                break;
1350
                            videotrack->pixel_width = num;
1351
                            break;
1352
                        }
1353

    
1354
                        /* height of the video in the file */
1355
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1356
                            uint64_t num;
1357
                            if ((res = ebml_read_uint(matroska, &id,
1358
                                                      &num)) < 0)
1359
                                break;
1360
                            videotrack->pixel_height = num;
1361
                            break;
1362
                        }
1363

    
1364
                        /* whether the video is interlaced */
1365
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1366
                            uint64_t num;
1367
                            if ((res = ebml_read_uint(matroska, &id,
1368
                                                      &num)) < 0)
1369
                                break;
1370
                            if (num)
1371
                                track->flags |=
1372
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1373
                            else
1374
                                track->flags &=
1375
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1376
                            break;
1377
                        }
1378

    
1379
                        /* stereo mode (whether the video has two streams,
1380
                         * where one is for the left eye and the other for
1381
                         * the right eye, which creates a 3D-like
1382
                         * effect) */
1383
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1384
                            uint64_t num;
1385
                            if ((res = ebml_read_uint(matroska, &id,
1386
                                                      &num)) < 0)
1387
                                break;
1388
                            if (num != MATROSKA_EYE_MODE_MONO &&
1389
                                num != MATROSKA_EYE_MODE_LEFT &&
1390
                                num != MATROSKA_EYE_MODE_RIGHT &&
1391
                                num != MATROSKA_EYE_MODE_BOTH) {
1392
                                av_log(matroska->ctx, AV_LOG_INFO,
1393
                                       "Ignoring unknown eye mode 0x%x\n",
1394
                                       (uint32_t) num);
1395
                                break;
1396
                            }
1397
                            videotrack->eye_mode = num;
1398
                            break;
1399
                        }
1400

    
1401
                        /* aspect ratio behaviour */
1402
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1403
                            uint64_t num;
1404
                            if ((res = ebml_read_uint(matroska, &id,
1405
                                                      &num)) < 0)
1406
                                break;
1407
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1408
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1409
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1410
                                av_log(matroska->ctx, AV_LOG_INFO,
1411
                                       "Ignoring unknown aspect ratio 0x%x\n",
1412
                                       (uint32_t) num);
1413
                                break;
1414
                            }
1415
                            videotrack->ar_mode = num;
1416
                            break;
1417
                        }
1418

    
1419
                        /* colourspace (only matters for raw video)
1420
                         * fourcc */
1421
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1422
                            uint64_t num;
1423
                            if ((res = ebml_read_uint(matroska, &id,
1424
                                                      &num)) < 0)
1425
                                break;
1426
                            videotrack->fourcc = num;
1427
                            break;
1428
                        }
1429

    
1430
                        default:
1431
                            av_log(matroska->ctx, AV_LOG_INFO,
1432
                                   "Unknown video track header entry "
1433
                                   "0x%x - ignoring\n", id);
1434
                            /* pass-through */
1435

    
1436
                        case EBML_ID_VOID:
1437
                            res = ebml_read_skip(matroska);
1438
                            break;
1439
                    }
1440

    
1441
                    if (matroska->level_up) {
1442
                        matroska->level_up--;
1443
                        break;
1444
                    }
1445
                }
1446
                break;
1447
            }
1448

    
1449
            /* tracktype specific stuff for audio */
1450
            case MATROSKA_ID_TRACKAUDIO: {
1451
                MatroskaAudioTrack *audiotrack;
1452
                if (!track->type)
1453
                    track->type = MATROSKA_TRACK_TYPE_AUDIO;
1454
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1455
                    av_log(matroska->ctx, AV_LOG_INFO,
1456
                           "audio data in non-audio track - ignoring\n");
1457
                    res = AVERROR_INVALIDDATA;
1458
                    break;
1459
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1460
                    break;
1461
                audiotrack = (MatroskaAudioTrack *)track;
1462
                audiotrack->channels = 1;
1463
                audiotrack->samplerate = 8000;
1464

    
1465
                while (res == 0) {
1466
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1467
                        res = AVERROR_IO;
1468
                        break;
1469
                    } else if (matroska->level_up > 0) {
1470
                        matroska->level_up--;
1471
                        break;
1472
                    }
1473

    
1474
                    switch (id) {
1475
                        /* samplerate */
1476
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1477
                            double num;
1478
                            if ((res = ebml_read_float(matroska, &id,
1479
                                                       &num)) < 0)
1480
                                break;
1481
                            audiotrack->internal_samplerate =
1482
                            audiotrack->samplerate = num;
1483
                            break;
1484
                        }
1485

    
1486
                        case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: {
1487
                            double num;
1488
                            if ((res = ebml_read_float(matroska, &id,
1489
                                                       &num)) < 0)
1490
                                break;
1491
                            audiotrack->samplerate = num;
1492
                            break;
1493
                        }
1494

    
1495
                            /* bitdepth */
1496
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1497
                            uint64_t num;
1498
                            if ((res = ebml_read_uint(matroska, &id,
1499
                                                      &num)) < 0)
1500
                                break;
1501
                            audiotrack->bitdepth = num;
1502
                            break;
1503
                        }
1504

    
1505
                            /* channels */
1506
                        case MATROSKA_ID_AUDIOCHANNELS: {
1507
                            uint64_t num;
1508
                            if ((res = ebml_read_uint(matroska, &id,
1509
                                                      &num)) < 0)
1510
                                break;
1511
                            audiotrack->channels = num;
1512
                            break;
1513
                        }
1514

    
1515
                        default:
1516
                            av_log(matroska->ctx, AV_LOG_INFO,
1517
                                   "Unknown audio track header entry "
1518
                                   "0x%x - ignoring\n", id);
1519
                            /* pass-through */
1520

    
1521
                        case EBML_ID_VOID:
1522
                            res = ebml_read_skip(matroska);
1523
                            break;
1524
                    }
1525

    
1526
                    if (matroska->level_up) {
1527
                        matroska->level_up--;
1528
                        break;
1529
                    }
1530
                }
1531
                break;
1532
            }
1533

    
1534
                /* codec identifier */
1535
            case MATROSKA_ID_CODECID: {
1536
                char *text;
1537
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1538
                    break;
1539
                track->codec_id = text;
1540
                break;
1541
            }
1542

    
1543
                /* codec private data */
1544
            case MATROSKA_ID_CODECPRIVATE: {
1545
                uint8_t *data;
1546
                int size;
1547
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1548
                    break;
1549
                track->codec_priv = data;
1550
                track->codec_priv_size = size;
1551
                break;
1552
            }
1553

    
1554
                /* name of the codec */
1555
            case MATROSKA_ID_CODECNAME: {
1556
                char *text;
1557
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1558
                    break;
1559
                track->codec_name = text;
1560
                break;
1561
            }
1562

    
1563
                /* name of this track */
1564
            case MATROSKA_ID_TRACKNAME: {
1565
                char *text;
1566
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1567
                    break;
1568
                track->name = text;
1569
                break;
1570
            }
1571

    
1572
                /* language (matters for audio/subtitles, mostly) */
1573
            case MATROSKA_ID_TRACKLANGUAGE: {
1574
                char *text;
1575
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1576
                    break;
1577
                track->language = text;
1578
                break;
1579
            }
1580

    
1581
                /* whether this is actually used */
1582
            case MATROSKA_ID_TRACKFLAGENABLED: {
1583
                uint64_t num;
1584
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1585
                    break;
1586
                if (num)
1587
                    track->flags |= MATROSKA_TRACK_ENABLED;
1588
                else
1589
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1590
                break;
1591
            }
1592

    
1593
                /* whether it's the default for this track type */
1594
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1595
                uint64_t num;
1596
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1597
                    break;
1598
                if (num)
1599
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1600
                else
1601
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1602
                break;
1603
            }
1604

    
1605
                /* lacing (like MPEG, where blocks don't end/start on frame
1606
                 * boundaries) */
1607
            case MATROSKA_ID_TRACKFLAGLACING: {
1608
                uint64_t num;
1609
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1610
                    break;
1611
                if (num)
1612
                    track->flags |= MATROSKA_TRACK_LACING;
1613
                else
1614
                    track->flags &= ~MATROSKA_TRACK_LACING;
1615
                break;
1616
            }
1617

    
1618
                /* default length (in time) of one data block in this track */
1619
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1620
                uint64_t num;
1621
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1622
                    break;
1623
                track->default_duration = num;
1624
                break;
1625
            }
1626

    
1627
            default:
1628
                av_log(matroska->ctx, AV_LOG_INFO,
1629
                       "Unknown track header entry 0x%x - ignoring\n", id);
1630
                /* pass-through */
1631

    
1632
            case EBML_ID_VOID:
1633
            /* we ignore these because they're nothing useful. */
1634
            case MATROSKA_ID_CODECINFOURL:
1635
            case MATROSKA_ID_CODECDOWNLOADURL:
1636
            case MATROSKA_ID_TRACKMINCACHE:
1637
            case MATROSKA_ID_TRACKMAXCACHE:
1638
                res = ebml_read_skip(matroska);
1639
                break;
1640
        }
1641

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

    
1648
    return res;
1649
}
1650

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

    
1657
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1658

    
1659
    while (res == 0) {
1660
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1661
            res = AVERROR_IO;
1662
            break;
1663
        } else if (matroska->level_up) {
1664
            matroska->level_up--;
1665
            break;
1666
        }
1667

    
1668
        switch (id) {
1669
            /* one track within the "all-tracks" header */
1670
            case MATROSKA_ID_TRACKENTRY:
1671
                res = matroska_add_stream(matroska);
1672
                break;
1673

    
1674
            default:
1675
                av_log(matroska->ctx, AV_LOG_INFO,
1676
                       "Unknown entry 0x%x in track header\n", id);
1677
                /* fall-through */
1678

    
1679
            case EBML_ID_VOID:
1680
                res = ebml_read_skip(matroska);
1681
                break;
1682
        }
1683

    
1684
        if (matroska->level_up) {
1685
            matroska->level_up--;
1686
            break;
1687
        }
1688
    }
1689

    
1690
    return res;
1691
}
1692

    
1693
static int
1694
matroska_parse_index (MatroskaDemuxContext *matroska)
1695
{
1696
    int res = 0;
1697
    uint32_t id;
1698
    MatroskaDemuxIndex idx;
1699

    
1700
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1701

    
1702
    while (res == 0) {
1703
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1704
            res = AVERROR_IO;
1705
            break;
1706
        } else if (matroska->level_up) {
1707
            matroska->level_up--;
1708
            break;
1709
        }
1710

    
1711
        switch (id) {
1712
            /* one single index entry ('point') */
1713
            case MATROSKA_ID_POINTENTRY:
1714
                if ((res = ebml_read_master(matroska, &id)) < 0)
1715
                    break;
1716

    
1717
                /* in the end, we hope to fill one entry with a
1718
                 * timestamp, a file position and a tracknum */
1719
                idx.pos   = (uint64_t) -1;
1720
                idx.time  = (uint64_t) -1;
1721
                idx.track = (uint16_t) -1;
1722

    
1723
                while (res == 0) {
1724
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1725
                        res = AVERROR_IO;
1726
                        break;
1727
                    } else if (matroska->level_up) {
1728
                        matroska->level_up--;
1729
                        break;
1730
                    }
1731

    
1732
                    switch (id) {
1733
                        /* one single index entry ('point') */
1734
                        case MATROSKA_ID_CUETIME: {
1735
                            uint64_t time;
1736
                            if ((res = ebml_read_uint(matroska, &id,
1737
                                                      &time)) < 0)
1738
                                break;
1739
                            idx.time = time * matroska->time_scale;
1740
                            break;
1741
                        }
1742

    
1743
                        /* position in the file + track to which it
1744
                         * belongs */
1745
                        case MATROSKA_ID_CUETRACKPOSITION:
1746
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1747
                                break;
1748

    
1749
                            while (res == 0) {
1750
                                if (!(id = ebml_peek_id (matroska,
1751
                                                    &matroska->level_up))) {
1752
                                    res = AVERROR_IO;
1753
                                    break;
1754
                                } else if (matroska->level_up) {
1755
                                    matroska->level_up--;
1756
                                    break;
1757
                                }
1758

    
1759
                                switch (id) {
1760
                                    /* track number */
1761
                                    case MATROSKA_ID_CUETRACK: {
1762
                                        uint64_t num;
1763
                                        if ((res = ebml_read_uint(matroska,
1764
                                                          &id, &num)) < 0)
1765
                                            break;
1766
                                        idx.track = num;
1767
                                        break;
1768
                                    }
1769

    
1770
                                        /* position in file */
1771
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1772
                                        uint64_t num;
1773
                                        if ((res = ebml_read_uint(matroska,
1774
                                                          &id, &num)) < 0)
1775
                                            break;
1776
                                        idx.pos = num;
1777
                                        break;
1778
                                    }
1779

    
1780
                                    default:
1781
                                        av_log(matroska->ctx, AV_LOG_INFO,
1782
                                               "Unknown entry 0x%x in "
1783
                                               "CuesTrackPositions\n", id);
1784
                                        /* fall-through */
1785

    
1786
                                    case EBML_ID_VOID:
1787
                                        res = ebml_read_skip(matroska);
1788
                                        break;
1789
                                }
1790

    
1791
                                if (matroska->level_up) {
1792
                                    matroska->level_up--;
1793
                                    break;
1794
                                }
1795
                            }
1796

    
1797
                            break;
1798

    
1799
                        default:
1800
                            av_log(matroska->ctx, AV_LOG_INFO,
1801
                                   "Unknown entry 0x%x in cuespoint "
1802
                                   "index\n", id);
1803
                            /* fall-through */
1804

    
1805
                        case EBML_ID_VOID:
1806
                            res = ebml_read_skip(matroska);
1807
                            break;
1808
                    }
1809

    
1810
                    if (matroska->level_up) {
1811
                        matroska->level_up--;
1812
                        break;
1813
                    }
1814
                }
1815

    
1816
                /* so let's see if we got what we wanted */
1817
                if (idx.pos   != (uint64_t) -1 &&
1818
                    idx.time  != (uint64_t) -1 &&
1819
                    idx.track != (uint16_t) -1) {
1820
                    if (matroska->num_indexes % 32 == 0) {
1821
                        /* re-allocate bigger index */
1822
                        matroska->index =
1823
                            av_realloc(matroska->index,
1824
                                       (matroska->num_indexes + 32) *
1825
                                       sizeof(MatroskaDemuxIndex));
1826
                    }
1827
                    matroska->index[matroska->num_indexes] = idx;
1828
                    matroska->num_indexes++;
1829
                }
1830
                break;
1831

    
1832
            default:
1833
                av_log(matroska->ctx, AV_LOG_INFO,
1834
                       "Unknown entry 0x%x in cues header\n", id);
1835
                /* fall-through */
1836

    
1837
            case EBML_ID_VOID:
1838
                res = ebml_read_skip(matroska);
1839
                break;
1840
        }
1841

    
1842
        if (matroska->level_up) {
1843
            matroska->level_up--;
1844
            break;
1845
        }
1846
    }
1847

    
1848
    return res;
1849
}
1850

    
1851
static int
1852
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1853
{
1854
    int res = 0;
1855
    uint32_t id;
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
            /* Hm, this is unsupported... */
1868
            default:
1869
                av_log(matroska->ctx, AV_LOG_INFO,
1870
                       "Unknown entry 0x%x in metadata header\n", id);
1871
                /* fall-through */
1872

    
1873
            case EBML_ID_VOID:
1874
                res = ebml_read_skip(matroska);
1875
                break;
1876
        }
1877

    
1878
        if (matroska->level_up) {
1879
            matroska->level_up--;
1880
            break;
1881
        }
1882
    }
1883

    
1884
    return res;
1885
}
1886

    
1887
static int
1888
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1889
{
1890
    int res = 0;
1891
    uint32_t id;
1892

    
1893
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1894

    
1895
    while (res == 0) {
1896
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1897
            res = AVERROR_IO;
1898
            break;
1899
        } else if (matroska->level_up) {
1900
            matroska->level_up--;
1901
            break;
1902
        }
1903

    
1904
        switch (id) {
1905
            case MATROSKA_ID_SEEKENTRY: {
1906
                uint32_t seek_id = 0, peek_id_cache = 0;
1907
                uint64_t seek_pos = (uint64_t) -1, t;
1908

    
1909
                if ((res = ebml_read_master(matroska, &id)) < 0)
1910
                    break;
1911

    
1912
                while (res == 0) {
1913
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1914
                        res = AVERROR_IO;
1915
                        break;
1916
                    } else if (matroska->level_up) {
1917
                        matroska->level_up--;
1918
                        break;
1919
                    }
1920

    
1921
                    switch (id) {
1922
                        case MATROSKA_ID_SEEKID:
1923
                            res = ebml_read_uint(matroska, &id, &t);
1924
                            seek_id = t;
1925
                            break;
1926

    
1927
                        case MATROSKA_ID_SEEKPOSITION:
1928
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1929
                            break;
1930

    
1931
                        default:
1932
                            av_log(matroska->ctx, AV_LOG_INFO,
1933
                                   "Unknown seekhead ID 0x%x\n", id);
1934
                            /* fall-through */
1935

    
1936
                        case EBML_ID_VOID:
1937
                            res = ebml_read_skip(matroska);
1938
                            break;
1939
                    }
1940

    
1941
                    if (matroska->level_up) {
1942
                        matroska->level_up--;
1943
                        break;
1944
                    }
1945
                }
1946

    
1947
                if (!seek_id || seek_pos == (uint64_t) -1) {
1948
                    av_log(matroska->ctx, AV_LOG_INFO,
1949
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1950
                           seek_id, seek_pos);
1951
                    break;
1952
                }
1953

    
1954
                switch (seek_id) {
1955
                    case MATROSKA_ID_CUES:
1956
                    case MATROSKA_ID_TAGS: {
1957
                        uint32_t level_up = matroska->level_up;
1958
                        offset_t before_pos;
1959
                        uint64_t length;
1960
                        MatroskaLevel level;
1961

    
1962
                        /* remember the peeked ID and the current position */
1963
                        peek_id_cache = matroska->peek_id;
1964
                        before_pos = url_ftell(&matroska->ctx->pb);
1965

    
1966
                        /* seek */
1967
                        if ((res = ebml_read_seek(matroska, seek_pos +
1968
                                               matroska->segment_start)) < 0)
1969
                            return res;
1970

    
1971
                        /* we don't want to lose our seekhead level, so we add
1972
                         * a dummy. This is a crude hack. */
1973
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1974
                            av_log(matroska->ctx, AV_LOG_INFO,
1975
                                   "Max EBML element depth (%d) reached, "
1976
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1977
                            return AVERROR_UNKNOWN;
1978
                        }
1979

    
1980
                        level.start = 0;
1981
                        level.length = (uint64_t)-1;
1982
                        matroska->levels[matroska->num_levels] = level;
1983
                        matroska->num_levels++;
1984

    
1985
                        /* check ID */
1986
                        if (!(id = ebml_peek_id (matroska,
1987
                                                 &matroska->level_up)))
1988
                            goto finish;
1989
                        if (id != seek_id) {
1990
                            av_log(matroska->ctx, AV_LOG_INFO,
1991
                                   "We looked for ID=0x%x but got "
1992
                                   "ID=0x%x (pos=%"PRIu64")",
1993
                                   seek_id, id, seek_pos +
1994
                                   matroska->segment_start);
1995
                            goto finish;
1996
                        }
1997

    
1998
                        /* read master + parse */
1999
                        if ((res = ebml_read_master(matroska, &id)) < 0)
2000
                            goto finish;
2001
                        switch (id) {
2002
                            case MATROSKA_ID_CUES:
2003
                                if (!(res = matroska_parse_index(matroska)) ||
2004
                                    url_feof(&matroska->ctx->pb)) {
2005
                                    matroska->index_parsed = 1;
2006
                                    res = 0;
2007
                                }
2008
                                break;
2009
                            case MATROSKA_ID_TAGS:
2010
                                if (!(res = matroska_parse_metadata(matroska)) ||
2011
                                   url_feof(&matroska->ctx->pb)) {
2012
                                    matroska->metadata_parsed = 1;
2013
                                    res = 0;
2014
                                }
2015
                                break;
2016
                        }
2017

    
2018
                    finish:
2019
                        /* remove dummy level */
2020
                        while (matroska->num_levels) {
2021
                            matroska->num_levels--;
2022
                            length =
2023
                                matroska->levels[matroska->num_levels].length;
2024
                            if (length == (uint64_t)-1)
2025
                                break;
2026
                        }
2027

    
2028
                        /* seek back */
2029
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
2030
                            return res;
2031
                        matroska->peek_id = peek_id_cache;
2032
                        matroska->level_up = level_up;
2033
                        break;
2034
                    }
2035

    
2036
                    default:
2037
                        av_log(matroska->ctx, AV_LOG_INFO,
2038
                               "Ignoring seekhead entry for ID=0x%x\n",
2039
                               seek_id);
2040
                        break;
2041
                }
2042

    
2043
                break;
2044
            }
2045

    
2046
            default:
2047
                av_log(matroska->ctx, AV_LOG_INFO,
2048
                       "Unknown seekhead ID 0x%x\n", id);
2049
                /* fall-through */
2050

    
2051
            case EBML_ID_VOID:
2052
                res = ebml_read_skip(matroska);
2053
                break;
2054
        }
2055

    
2056
        if (matroska->level_up) {
2057
            matroska->level_up--;
2058
            break;
2059
        }
2060
    }
2061

    
2062
    return res;
2063
}
2064

    
2065
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2066

    
2067
static int
2068
matroska_aac_profile (char *codec_id)
2069
{
2070
    static const char *aac_profiles[] = {
2071
        "MAIN", "LC", "SSR"
2072
    };
2073
    int profile;
2074

    
2075
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2076
        if (strstr(codec_id, aac_profiles[profile]))
2077
            break;
2078
    return profile + 1;
2079
}
2080

    
2081
static int
2082
matroska_aac_sri (int samplerate)
2083
{
2084
    static const int aac_sample_rates[] = {
2085
        96000, 88200, 64000, 48000, 44100, 32000,
2086
        24000, 22050, 16000, 12000, 11025,  8000,
2087
    };
2088
    int sri;
2089

    
2090
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2091
        if (aac_sample_rates[sri] == samplerate)
2092
            break;
2093
    return sri;
2094
}
2095

    
2096
static int
2097
matroska_read_header (AVFormatContext    *s,
2098
                      AVFormatParameters *ap)
2099
{
2100
    MatroskaDemuxContext *matroska = s->priv_data;
2101
    char *doctype;
2102
    int version, last_level, res = 0;
2103
    uint32_t id;
2104

    
2105
    matroska->ctx = s;
2106

    
2107
    /* First read the EBML header. */
2108
    doctype = NULL;
2109
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2110
        return res;
2111
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2112
        av_log(matroska->ctx, AV_LOG_ERROR,
2113
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2114
               doctype ? doctype : "(none)");
2115
        if (doctype)
2116
            av_free(doctype);
2117
        return AVERROR_NOFMT;
2118
    }
2119
    av_free(doctype);
2120
    if (version > 2) {
2121
        av_log(matroska->ctx, AV_LOG_ERROR,
2122
               "Matroska demuxer version 2 too old for file version %d\n",
2123
               version);
2124
        return AVERROR_NOFMT;
2125
    }
2126

    
2127
    /* The next thing is a segment. */
2128
    while (1) {
2129
        if (!(id = ebml_peek_id(matroska, &last_level)))
2130
            return AVERROR_IO;
2131
        if (id == MATROSKA_ID_SEGMENT)
2132
            break;
2133

    
2134
        /* oi! */
2135
        av_log(matroska->ctx, AV_LOG_INFO,
2136
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2137
               MATROSKA_ID_SEGMENT, id);
2138
        if ((res = ebml_read_skip(matroska)) < 0)
2139
            return res;
2140
    }
2141

    
2142
    /* We now have a Matroska segment.
2143
     * Seeks are from the beginning of the segment,
2144
     * after the segment ID/length. */
2145
    if ((res = ebml_read_master(matroska, &id)) < 0)
2146
        return res;
2147
    matroska->segment_start = url_ftell(&s->pb);
2148

    
2149
    matroska->time_scale = 1000000;
2150
    /* we've found our segment, start reading the different contents in here */
2151
    while (res == 0) {
2152
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2153
            res = AVERROR_IO;
2154
            break;
2155
        } else if (matroska->level_up) {
2156
            matroska->level_up--;
2157
            break;
2158
        }
2159

    
2160
        switch (id) {
2161
            /* stream info */
2162
            case MATROSKA_ID_INFO: {
2163
                if ((res = ebml_read_master(matroska, &id)) < 0)
2164
                    break;
2165
                res = matroska_parse_info(matroska);
2166
                break;
2167
            }
2168

    
2169
            /* track info headers */
2170
            case MATROSKA_ID_TRACKS: {
2171
                if ((res = ebml_read_master(matroska, &id)) < 0)
2172
                    break;
2173
                res = matroska_parse_tracks(matroska);
2174
                break;
2175
            }
2176

    
2177
            /* stream index */
2178
            case MATROSKA_ID_CUES: {
2179
                if (!matroska->index_parsed) {
2180
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2181
                        break;
2182
                    res = matroska_parse_index(matroska);
2183
                } else
2184
                    res = ebml_read_skip(matroska);
2185
                break;
2186
            }
2187

    
2188
            /* metadata */
2189
            case MATROSKA_ID_TAGS: {
2190
                if (!matroska->metadata_parsed) {
2191
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2192
                        break;
2193
                    res = matroska_parse_metadata(matroska);
2194
                } else
2195
                    res = ebml_read_skip(matroska);
2196
                break;
2197
            }
2198

    
2199
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2200
            case MATROSKA_ID_SEEKHEAD: {
2201
                if ((res = ebml_read_master(matroska, &id)) < 0)
2202
                    break;
2203
                res = matroska_parse_seekhead(matroska);
2204
                break;
2205
            }
2206

    
2207
            case MATROSKA_ID_CLUSTER: {
2208
                /* Do not read the master - this will be done in the next
2209
                 * call to matroska_read_packet. */
2210
                res = 1;
2211
                break;
2212
            }
2213

    
2214
            default:
2215
                av_log(matroska->ctx, AV_LOG_INFO,
2216
                       "Unknown matroska file header ID 0x%x\n", id);
2217
            /* fall-through */
2218

    
2219
            case EBML_ID_VOID:
2220
                res = ebml_read_skip(matroska);
2221
                break;
2222
        }
2223

    
2224
        if (matroska->level_up) {
2225
            matroska->level_up--;
2226
            break;
2227
        }
2228
    }
2229

    
2230
    /* Have we found a cluster? */
2231
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2232
        int i, j;
2233
        MatroskaTrack *track;
2234
        AVStream *st;
2235

    
2236
        for (i = 0; i < matroska->num_tracks; i++) {
2237
            enum CodecID codec_id = CODEC_ID_NONE;
2238
            uint8_t *extradata = NULL;
2239
            int extradata_size = 0;
2240
            int extradata_offset = 0;
2241
            track = matroska->tracks[i];
2242

    
2243
            /* libavformat does not really support subtitles.
2244
             * Also apply some sanity checks. */
2245
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2246
                (track->codec_id == NULL))
2247
                continue;
2248

    
2249
            for(j=0; codec_tags[j].str; j++){
2250
                if(!strncmp(codec_tags[j].str, track->codec_id,
2251
                            strlen(codec_tags[j].str))){
2252
                    codec_id= codec_tags[j].id;
2253
                    break;
2254
                }
2255
            }
2256

    
2257
            /* Set the FourCC from the CodecID. */
2258
            /* This is the MS compatibility mode which stores a
2259
             * BITMAPINFOHEADER in the CodecPrivate. */
2260
            if (!strcmp(track->codec_id,
2261
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2262
                (track->codec_priv_size >= 40) &&
2263
                (track->codec_priv != NULL)) {
2264
                unsigned char *p;
2265

    
2266
                /* Offset of biCompression. Stored in LE. */
2267
                p = (unsigned char *)track->codec_priv + 16;
2268
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2269
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2270
                codec_id = codec_get_id(codec_bmp_tags, ((MatroskaVideoTrack *)track)->fourcc);
2271

    
2272
            }
2273

    
2274
            /* This is the MS compatibility mode which stores a
2275
             * WAVEFORMATEX in the CodecPrivate. */
2276
            else if (!strcmp(track->codec_id,
2277
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2278
                (track->codec_priv_size >= 18) &&
2279
                (track->codec_priv != NULL)) {
2280
                unsigned char *p;
2281
                uint16_t tag;
2282

    
2283
                /* Offset of wFormatTag. Stored in LE. */
2284
                p = (unsigned char *)track->codec_priv;
2285
                tag = (p[1] << 8) | p[0];
2286
                codec_id = codec_get_id(codec_wav_tags, tag);
2287

    
2288
            }
2289

    
2290
            else if (codec_id == CODEC_ID_MPEG1VIDEO ||
2291
                     codec_id == CODEC_ID_MPEG2VIDEO ||
2292
                     codec_id == CODEC_ID_MPEG4      ||
2293
                     codec_id == CODEC_ID_MSMPEG4V3  ||
2294
                     codec_id == CODEC_ID_H264) {
2295
                track->flags |= MATROSKA_TRACK_REORDER;
2296
            }
2297

    
2298
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
2299
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2300
                int profile = matroska_aac_profile(track->codec_id);
2301
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2302
                extradata = av_malloc(5);
2303
                if (extradata == NULL)
2304
                    return AVERROR_NOMEM;
2305
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2306
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2307
                if (strstr(track->codec_id, "SBR")) {
2308
                    sri = matroska_aac_sri(audiotrack->samplerate);
2309
                    extradata[2] = 0x56;
2310
                    extradata[3] = 0xE5;
2311
                    extradata[4] = 0x80 | (sri<<3);
2312
                    extradata_size = 5;
2313
                } else {
2314
                    extradata_size = 2;
2315
                }
2316
            }
2317

    
2318
            else if (codec_id == CODEC_ID_TTA) {
2319
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2320
                ByteIOContext b;
2321
                extradata_size = 30;
2322
                extradata = av_mallocz(extradata_size);
2323
                if (extradata == NULL)
2324
                    return AVERROR_NOMEM;
2325
                init_put_byte(&b, extradata, extradata_size, 1,
2326
                              NULL, NULL, NULL, NULL);
2327
                put_buffer(&b, (uint8_t *) "TTA1", 4);
2328
                put_le16(&b, 1);
2329
                put_le16(&b, audiotrack->channels);
2330
                put_le16(&b, audiotrack->bitdepth);
2331
                put_le32(&b, audiotrack->samplerate);
2332
                put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
2333
            }
2334

    
2335
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
2336
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
2337
                extradata_offset = 26;
2338
                track->codec_priv_size -= extradata_offset;
2339
                track->flags |= MATROSKA_TRACK_REAL_V;
2340
            }
2341

    
2342
            if (codec_id == CODEC_ID_NONE) {
2343
                av_log(matroska->ctx, AV_LOG_INFO,
2344
                       "Unknown/unsupported CodecID %s.\n",
2345
                       track->codec_id);
2346
            }
2347

    
2348
            track->stream_index = matroska->num_streams;
2349

    
2350
            matroska->num_streams++;
2351
            st = av_new_stream(s, track->stream_index);
2352
            if (st == NULL)
2353
                return AVERROR_NOMEM;
2354
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2355

    
2356
            st->codec->codec_id = codec_id;
2357

    
2358
            if (track->default_duration)
2359
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2360
                          track->default_duration, 1000000000, 30000);
2361

    
2362
            if(extradata){
2363
                st->codec->extradata = extradata;
2364
                st->codec->extradata_size = extradata_size;
2365
            } else if(track->codec_priv && track->codec_priv_size > 0){
2366
                st->codec->extradata = av_malloc(track->codec_priv_size);
2367
                if(st->codec->extradata == NULL)
2368
                    return AVERROR_NOMEM;
2369
                st->codec->extradata_size = track->codec_priv_size;
2370
                memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
2371
                       track->codec_priv_size);
2372
            }
2373

    
2374
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2375
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2376

    
2377
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2378
                st->codec->codec_tag = videotrack->fourcc;
2379
                st->codec->width = videotrack->pixel_width;
2380
                st->codec->height = videotrack->pixel_height;
2381
                if (videotrack->display_width == 0)
2382
                    videotrack->display_width= videotrack->pixel_width;
2383
                if (videotrack->display_height == 0)
2384
                    videotrack->display_height= videotrack->pixel_height;
2385
                av_reduce(&st->codec->sample_aspect_ratio.num,
2386
                          &st->codec->sample_aspect_ratio.den,
2387
                          st->codec->height * videotrack->display_width,
2388
                          st->codec-> width * videotrack->display_height,
2389
                          255);
2390
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2391
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2392

    
2393
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2394
                st->codec->sample_rate = audiotrack->samplerate;
2395
                st->codec->channels = audiotrack->channels;
2396
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2397
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2398
            }
2399

    
2400
            /* What do we do with private data? E.g. for Vorbis. */
2401
        }
2402
        res = 0;
2403
    }
2404

    
2405
    return res;
2406
}
2407

    
2408
static int
2409
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2410
                            int                   num)
2411
{
2412
    int i;
2413

    
2414
    for (i = 0; i < matroska->num_tracks; i++)
2415
        if (matroska->tracks[i]->num == num)
2416
            return i;
2417

    
2418
    return -1;
2419
}
2420

    
2421
static inline int
2422
rv_offset(uint8_t *data, int slice, int slices)
2423
{
2424
    return AV_RL32(data+8*slice+4) + 8*slices;
2425
}
2426

    
2427
static int
2428
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
2429
                     int64_t pos, uint64_t cluster_time,
2430
                     int is_keyframe, int is_bframe,
2431
                     int *ptrack, AVPacket **ppkt)
2432
{
2433
    int res = 0;
2434
    int track;
2435
    AVPacket *pkt;
2436
    uint8_t *origdata = data;
2437
    int16_t block_time;
2438
    uint32_t *lace_size = NULL;
2439
    int n, flags, laces = 0;
2440
    uint64_t num;
2441

    
2442
    /* first byte(s): tracknum */
2443
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2444
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2445
        av_free(origdata);
2446
        return res;
2447
    }
2448
    data += n;
2449
    size -= n;
2450

    
2451
    /* fetch track from num */
2452
    track = matroska_find_track_by_num(matroska, num);
2453
    if (ptrack)  *ptrack = track;
2454
    if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2455
        av_log(matroska->ctx, AV_LOG_INFO,
2456
               "Invalid stream %d or size %u\n", track, size);
2457
        av_free(origdata);
2458
        return res;
2459
    }
2460
    if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2461
        av_free(origdata);
2462
        return res;
2463
    }
2464

    
2465
    /* block_time (relative to cluster time) */
2466
    block_time = (data[0] << 8) | data[1];
2467
    data += 2;
2468
    size -= 2;
2469
    flags = *data;
2470
    data += 1;
2471
    size -= 1;
2472
    if (is_keyframe == -1)
2473
        is_keyframe = flags & 1 ? PKT_FLAG_KEY : 0;
2474
    switch ((flags & 0x06) >> 1) {
2475
        case 0x0: /* no lacing */
2476
            laces = 1;
2477
            lace_size = av_mallocz(sizeof(int));
2478
            lace_size[0] = size;
2479
            break;
2480

    
2481
        case 0x1: /* xiph lacing */
2482
        case 0x2: /* fixed-size lacing */
2483
        case 0x3: /* EBML lacing */
2484
            if (size == 0) {
2485
                res = -1;
2486
                break;
2487
            }
2488
            laces = (*data) + 1;
2489
            data += 1;
2490
            size -= 1;
2491
            lace_size = av_mallocz(laces * sizeof(int));
2492

    
2493
            switch ((flags & 0x06) >> 1) {
2494
                case 0x1: /* xiph lacing */ {
2495
                    uint8_t temp;
2496
                    uint32_t total = 0;
2497
                    for (n = 0; res == 0 && n < laces - 1; n++) {
2498
                        while (1) {
2499
                            if (size == 0) {
2500
                                res = -1;
2501
                                break;
2502
                            }
2503
                            temp = *data;
2504
                            lace_size[n] += temp;
2505
                            data += 1;
2506
                            size -= 1;
2507
                            if (temp != 0xff)
2508
                                break;
2509
                        }
2510
                        total += lace_size[n];
2511
                    }
2512
                    lace_size[n] = size - total;
2513
                    break;
2514
                }
2515

    
2516
                case 0x2: /* fixed-size lacing */
2517
                    for (n = 0; n < laces; n++)
2518
                        lace_size[n] = size / laces;
2519
                    break;
2520

    
2521
                case 0x3: /* EBML lacing */ {
2522
                    uint32_t total;
2523
                    n = matroska_ebmlnum_uint(data, size, &num);
2524
                    if (n < 0) {
2525
                        av_log(matroska->ctx, AV_LOG_INFO,
2526
                               "EBML block data error\n");
2527
                        break;
2528
                    }
2529
                    data += n;
2530
                    size -= n;
2531
                    total = lace_size[0] = num;
2532
                    for (n = 1; res == 0 && n < laces - 1; n++) {
2533
                        int64_t snum;
2534
                        int r;
2535
                        r = matroska_ebmlnum_sint (data, size, &snum);
2536
                        if (r < 0) {
2537
                            av_log(matroska->ctx, AV_LOG_INFO,
2538
                                   "EBML block data error\n");
2539
                            break;
2540
                        }
2541
                        data += r;
2542
                        size -= r;
2543
                        lace_size[n] = lace_size[n - 1] + snum;
2544
                        total += lace_size[n];
2545
                    }
2546
                    lace_size[n] = size - total;
2547
                    break;
2548
                }
2549
            }
2550
            break;
2551
    }
2552

    
2553
    if (res == 0) {
2554
        int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
2555
        uint64_t timecode = AV_NOPTS_VALUE;
2556

    
2557
        if (cluster_time != (uint64_t)-1 && cluster_time + block_time >= 0)
2558
            timecode = cluster_time + block_time;
2559

    
2560
        for (n = 0; n < laces; n++) {
2561
            int slice, slices = 1;
2562

    
2563
            if (real_v) {
2564
                slices = *data++ + 1;
2565
                lace_size[n]--;
2566
            }
2567
            /* FIXME: duration */
2568

    
2569
            for (slice=0; slice<slices; slice++) {
2570
                int slice_size, slice_offset = 0;
2571
                if (real_v)
2572
                    slice_offset = rv_offset(data, slice, slices);
2573
                if (slice+1 == slices)
2574
                    slice_size = lace_size[n] - slice_offset;
2575
                else
2576
                    slice_size = rv_offset(data, slice+1, slices) - slice_offset;
2577
                pkt = av_mallocz(sizeof(AVPacket));
2578
                if (ppkt)  *ppkt = pkt;
2579
                /* XXX: prevent data copy... */
2580
                if (av_new_packet(pkt, slice_size) < 0) {
2581
                    res = AVERROR_NOMEM;
2582
                    n = laces-1;
2583
                    break;
2584
                }
2585
                memcpy (pkt->data, data+slice_offset, slice_size);
2586

    
2587
                if (n == 0)
2588
                    pkt->flags = is_keyframe;
2589
                pkt->stream_index = matroska->tracks[track]->stream_index;
2590

    
2591
                pkt->pts = timecode;
2592
                pkt->pos = pos;
2593

    
2594
                if (matroska->tracks[track]->flags & MATROSKA_TRACK_REORDER)
2595
                    matroska_queue_packet_reordered(matroska, pkt, is_bframe);
2596
                else
2597
                    matroska_queue_packet(matroska, pkt);
2598

    
2599
                timecode = AV_NOPTS_VALUE;
2600
            }
2601
            data += lace_size[n];
2602
        }
2603
    }
2604

    
2605
    av_free(lace_size);
2606
    av_free(origdata);
2607
    return res;
2608
}
2609

    
2610
static int
2611
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2612
                           uint64_t              cluster_time)
2613
{
2614
    int res = 0;
2615
    uint32_t id;
2616
    AVPacket *pkt = NULL;
2617
    int is_bframe = 0;
2618
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2619
    uint64_t duration = AV_NOPTS_VALUE;
2620
    int track = -1;
2621
    uint8_t *data;
2622
    int size = 0;
2623
    int64_t pos = 0;
2624

    
2625
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2626

    
2627
    while (res == 0) {
2628
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2629
            res = AVERROR_IO;
2630
            break;
2631
        } else if (matroska->level_up) {
2632
            matroska->level_up--;
2633
            break;
2634
        }
2635

    
2636
        switch (id) {
2637
            /* one block inside the group. Note, block parsing is one
2638
             * of the harder things, so this code is a bit complicated.
2639
             * See http://www.matroska.org/ for documentation. */
2640
            case MATROSKA_ID_BLOCK: {
2641
                pos = url_ftell(&matroska->ctx->pb);
2642
                res = ebml_read_binary(matroska, &id, &data, &size);
2643
                break;
2644
            }
2645

    
2646
            case MATROSKA_ID_BLOCKDURATION: {
2647
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2648
                    break;
2649
                break;
2650
            }
2651

    
2652
            case MATROSKA_ID_BLOCKREFERENCE: {
2653
                int64_t num;
2654
                /* We've found a reference, so not even the first frame in
2655
                 * the lace is a key frame. */
2656
                is_keyframe = 0;
2657
                if (last_num_packets != matroska->num_packets)
2658
                    matroska->packets[last_num_packets]->flags = 0;
2659
                if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
2660
                    break;
2661
                if (num > 0)
2662
                    is_bframe = 1;
2663
                break;
2664
            }
2665

    
2666
            default:
2667
                av_log(matroska->ctx, AV_LOG_INFO,
2668
                       "Unknown entry 0x%x in blockgroup data\n", id);
2669
                /* fall-through */
2670

    
2671
            case EBML_ID_VOID:
2672
                res = ebml_read_skip(matroska);
2673
                break;
2674
        }
2675

    
2676
        if (matroska->level_up) {
2677
            matroska->level_up--;
2678
            break;
2679
        }
2680
    }
2681

    
2682
    if (res)
2683
        return res;
2684

    
2685
    if (size > 0)
2686
        res = matroska_parse_block(matroska, data, size, pos, cluster_time,
2687
                                   is_keyframe, is_bframe, &track, &pkt);
2688

    
2689
    if (pkt)
2690
    {
2691
        if (duration != AV_NOPTS_VALUE)
2692
            pkt->duration = duration;
2693
        else if (track >= 0 && track < matroska->num_tracks)
2694
            pkt->duration = matroska->tracks[track]->default_duration / matroska->time_scale;
2695
    }
2696

    
2697
    return res;
2698
}
2699

    
2700
static int
2701
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2702
{
2703
    int res = 0;
2704
    uint32_t id;
2705
    uint64_t cluster_time = 0;
2706
    uint8_t *data;
2707
    int64_t pos;
2708
    int size;
2709

    
2710
    av_log(matroska->ctx, AV_LOG_DEBUG,
2711
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2712

    
2713
    while (res == 0) {
2714
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2715
            res = AVERROR_IO;
2716
            break;
2717
        } else if (matroska->level_up) {
2718
            matroska->level_up--;
2719
            break;
2720
        }
2721

    
2722
        switch (id) {
2723
            /* cluster timecode */
2724
            case MATROSKA_ID_CLUSTERTIMECODE: {
2725
                uint64_t num;
2726
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2727
                    break;
2728
                cluster_time = num;
2729
                break;
2730
            }
2731

    
2732
                /* a group of blocks inside a cluster */
2733
            case MATROSKA_ID_BLOCKGROUP:
2734
                if ((res = ebml_read_master(matroska, &id)) < 0)
2735
                    break;
2736
                res = matroska_parse_blockgroup(matroska, cluster_time);
2737
                break;
2738

    
2739
            case MATROSKA_ID_SIMPLEBLOCK:
2740
                pos = url_ftell(&matroska->ctx->pb);
2741
                res = ebml_read_binary(matroska, &id, &data, &size);
2742
                if (res == 0)
2743
                    res = matroska_parse_block(matroska, data, size, pos,
2744
                                               cluster_time, -1,0, NULL, NULL);
2745
                break;
2746

    
2747
            default:
2748
                av_log(matroska->ctx, AV_LOG_INFO,
2749
                       "Unknown entry 0x%x in cluster data\n", id);
2750
                /* fall-through */
2751

    
2752
            case EBML_ID_VOID:
2753
                res = ebml_read_skip(matroska);
2754
                break;
2755
        }
2756

    
2757
        if (matroska->level_up) {
2758
            matroska->level_up--;
2759
            break;
2760
        }
2761
    }
2762

    
2763
    return res;
2764
}
2765

    
2766
static int
2767
matroska_read_packet (AVFormatContext *s,
2768
                      AVPacket        *pkt)
2769
{
2770
    MatroskaDemuxContext *matroska = s->priv_data;
2771
    int res = 0;
2772
    uint32_t id;
2773

    
2774
    /* Read stream until we have a packet queued. */
2775
    while (matroska_deliver_packet(matroska, pkt)) {
2776

    
2777
        /* Have we already reached the end? */
2778
        if (matroska->done)
2779
            return AVERROR_IO;
2780

    
2781
        while (res == 0) {
2782
            if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2783
                return AVERROR_IO;
2784
            } else if (matroska->level_up) {
2785
                matroska->level_up--;
2786
                break;
2787
            }
2788

    
2789
            switch (id) {
2790
                case MATROSKA_ID_CLUSTER:
2791
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2792
                        break;
2793
                    if ((res = matroska_parse_cluster(matroska)) == 0)
2794
                        res = 1; /* Parsed one cluster, let's get out. */
2795
                    break;
2796

    
2797
                default:
2798
                case EBML_ID_VOID:
2799
                    res = ebml_read_skip(matroska);
2800
                    break;
2801
            }
2802

    
2803
            if (matroska->level_up) {
2804
                matroska->level_up--;
2805
                break;
2806
            }
2807
        }
2808

    
2809
        if (res == -1)
2810
            matroska->done = 1;
2811
    }
2812

    
2813
    return 0;
2814
}
2815

    
2816
static int
2817
matroska_read_close (AVFormatContext *s)
2818
{
2819
    MatroskaDemuxContext *matroska = s->priv_data;
2820
    int n = 0;
2821

    
2822
    av_free(matroska->writing_app);
2823
    av_free(matroska->muxing_app);
2824
    av_free(matroska->index);
2825

    
2826
    if (matroska->packets != NULL) {
2827
        for (n = 0; n < matroska->num_packets; n++) {
2828
            av_free_packet(matroska->packets[n]);
2829
            av_free(matroska->packets[n]);
2830
        }
2831
        av_free(matroska->packets);
2832
    }
2833
    if (matroska->packets_reorder) {
2834
        for (n = 0; n < matroska->num_packets_reorder; n++) {
2835
            av_free_packet(matroska->packets_reorder[n]);
2836
            av_free(matroska->packets_reorder[n]);
2837
        }
2838
        av_free(matroska->packets_reorder);
2839
    }
2840

    
2841
    for (n = 0; n < matroska->num_tracks; n++) {
2842
        MatroskaTrack *track = matroska->tracks[n];
2843
        av_free(track->codec_id);
2844
        av_free(track->codec_name);
2845
        av_free(track->codec_priv);
2846
        av_free(track->name);
2847
        av_free(track->language);
2848

    
2849
        av_free(track);
2850
    }
2851

    
2852
    return 0;
2853
}
2854

    
2855
AVInputFormat matroska_demuxer = {
2856
    "matroska",
2857
    "Matroska file format",
2858
    sizeof(MatroskaDemuxContext),
2859
    matroska_probe,
2860
    matroska_read_header,
2861
    matroska_read_packet,
2862
    matroska_read_close,
2863
};