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/*
2
 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 The ffmpeg Project
4
 *
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 * This file is part of FFmpeg.
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 *
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 * 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.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

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

    
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#include "avformat.h"
32
/* For codec_get_bmp_id and codec_get_wav_id. */
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#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 */
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#define EBML_ID_EBMLVERSION        0x4286
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#define EBML_ID_EBMLREADVERSION    0x42F7
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#define EBML_ID_EBMLMAXIDLENGTH    0x42F2
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#define EBML_ID_EBMLMAXSIZELENGTH  0x42F3
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#define EBML_ID_DOCTYPE            0x4282
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#define EBML_ID_DOCTYPEVERSION     0x4287
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#define EBML_ID_DOCTYPEREADVERSION 0x4285
50

    
51
/* general EBML types */
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#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 */
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#define MATROSKA_ID_INFO       0x1549A966
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#define MATROSKA_ID_TRACKS     0x1654AE6B
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#define MATROSKA_ID_CUES       0x1C53BB6B
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#define MATROSKA_ID_TAGS       0x1254C367
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#define MATROSKA_ID_SEEKHEAD   0x114D9B74
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#define MATROSKA_ID_CLUSTER    0x1F43B675
68

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

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

    
80
/* IDs in the trackentry master */
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#define MATROSKA_ID_TRACKNUMBER 0xD7
82
#define MATROSKA_ID_TRACKUID   0x73C5
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#define MATROSKA_ID_TRACKTYPE  0x83
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#define MATROSKA_ID_TRACKAUDIO 0xE1
85
#define MATROSKA_ID_TRACKVIDEO 0xE0
86
#define MATROSKA_ID_CODECID    0x86
87
#define MATROSKA_ID_CODECPRIVATE 0x63A2
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#define MATROSKA_ID_CODECNAME  0x258688
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#define MATROSKA_ID_CODECINFOURL 0x3B4040
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#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
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#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
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#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
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#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
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#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
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#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
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#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
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#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
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#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
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111
/* IDs in the trackaudio master */
112
#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
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#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
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#define MATROSKA_ID_BLOCKGROUP 0xA0
142

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

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

    
157
typedef enum {
158
  MATROSKA_EYE_MODE_MONO  = 0x0,
159
  MATROSKA_EYE_MODE_RIGHT = 0x1,
160
  MATROSKA_EYE_MODE_LEFT  = 0x2,
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  MATROSKA_EYE_MODE_BOTH  = 0x3,
162
} MatroskaEyeMode;
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164
typedef enum {
165
  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
166
  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
167
  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
168
} MatroskaAspectRatioMode;
169

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

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

    
182
typedef enum {
183
  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
184
} MatroskaVideoTrackFlags;
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186
/*
187
 * Matroska Codec IDs. Strings.
188
 */
189

    
190
typedef struct CodecTags{
191
    const char *str;
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    enum CodecID id;
193
}CodecTags;
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195
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
196
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
197

    
198
static CodecTags codec_tags[]={
199
//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
200
    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
201
    {"V_MPEG4/ISO/SP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/ASP"  , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AVC"  , CODEC_ID_H264},
205
    {"V_MPEG4/MS/V3"    , CODEC_ID_MSMPEG4V3},
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    {"V_MPEG1"          , CODEC_ID_MPEG1VIDEO},
207
    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
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    {"V_MJPEG"          , CODEC_ID_MJPEG},
209
    {"V_REAL/RV10"      , CODEC_ID_RV10},
210
    {"V_REAL/RV20"      , CODEC_ID_RV20},
211
    {"V_REAL/RV30"      , CODEC_ID_RV30},
212
    {"V_REAL/RV40"      , CODEC_ID_RV40},
213
/* TODO: Real/Quicktime */
214

    
215
//    {"A_MS/ACM"         , CODEC_ID_NONE},
216
    {"A_MPEG/L1"        , CODEC_ID_MP3},
217
    {"A_MPEG/L2"        , CODEC_ID_MP3},
218
    {"A_MPEG/L3"        , CODEC_ID_MP3},
219
    {"A_PCM/INT/BIG"    , CODEC_ID_PCM_U16BE},
220
    {"A_PCM/INT/LIT"    , CODEC_ID_PCM_U16LE},
221
//    {"A_PCM/FLOAT/IEEE" , CODEC_ID_NONE},
222
    {"A_AC3"            , CODEC_ID_AC3},
223
    {"A_DTS"            , CODEC_ID_DTS},
224
    {"A_VORBIS"         , CODEC_ID_VORBIS},
225
    {"A_AAC/MPEG2/"     , CODEC_ID_AAC},
226
    {"A_AAC/MPEG4/"     , CODEC_ID_MPEG4AAC},
227
    {"A_WAVPACK4"       , CODEC_ID_WAVPACK},
228
    {NULL               , CODEC_ID_NONE}
229
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
230
};
231

    
232
/* max. depth in the EBML tree structure */
233
#define EBML_MAX_DEPTH 16
234

    
235
typedef struct Track {
236
    MatroskaTrackType type;
237

    
238
    /* Unique track number and track ID. stream_index is the index that
239
     * the calling app uses for this track. */
240
    uint32_t num,
241
        uid,
242
        stream_index;
243

    
244
    char *name,
245
        *language;
246

    
247
    char *codec_id,
248
        *codec_name;
249

    
250
    unsigned char *codec_priv;
251
    int codec_priv_size;
252

    
253
    int64_t default_duration;
254
    MatroskaTrackFlags flags;
255
} MatroskaTrack;
256

    
257
typedef struct MatroskaVideoTrack {
258
    MatroskaTrack track;
259

    
260
    int pixel_width,
261
        pixel_height,
262
        display_width,
263
        display_height;
264

    
265
    uint32_t fourcc;
266

    
267
    MatroskaAspectRatioMode ar_mode;
268
    MatroskaEyeMode eye_mode;
269

    
270
    //..
271
} MatroskaVideoTrack;
272

    
273
typedef struct MatroskaAudioTrack {
274
    MatroskaTrack track;
275

    
276
    int channels,
277
        bitdepth,
278
        internal_samplerate,
279
        samplerate;
280
    //..
281
} MatroskaAudioTrack;
282

    
283
typedef struct MatroskaSubtitleTrack {
284
    MatroskaTrack track;
285

    
286
    //..
287
} MatroskaSubtitleTrack;
288

    
289
typedef struct MatroskaLevel {
290
    uint64_t start, length;
291
} MatroskaLevel;
292

    
293
typedef struct MatroskaDemuxIndex {
294
  uint64_t        pos;   /* of the corresponding *cluster*! */
295
  uint16_t        track; /* reference to 'num' */
296
  uint64_t        time;  /* in nanoseconds */
297
} MatroskaDemuxIndex;
298

    
299
typedef struct MatroskaDemuxContext {
300
    AVFormatContext *ctx;
301

    
302
    /* ebml stuff */
303
    int num_levels;
304
    MatroskaLevel levels[EBML_MAX_DEPTH];
305
    int level_up;
306

    
307
    /* matroska stuff */
308
    char *writing_app,
309
        *muxing_app;
310
    int64_t created;
311

    
312
    /* timescale in the file */
313
    int64_t time_scale;
314

    
315
    /* position (time, ns) */
316
    int64_t pos;
317

    
318
    /* num_streams is the number of streams that av_new_stream() was called
319
     * for ( = that are available to the calling program). */
320
    int num_tracks, num_streams;
321
    MatroskaTrack *tracks[MAX_STREAMS];
322

    
323
    /* cache for ID peeking */
324
    uint32_t peek_id;
325

    
326
    /* byte position of the segment inside the stream */
327
    offset_t segment_start;
328

    
329
    /* The packet queue. */
330
    AVPacket **packets;
331
    int num_packets;
332

    
333
    /* have we already parse metadata/cues/clusters? */
334
    int metadata_parsed,
335
        index_parsed,
336
        done;
337

    
338
    /* The index for seeking. */
339
    int num_indexes;
340
    MatroskaDemuxIndex *index;
341
} MatroskaDemuxContext;
342

    
343
/*
344
 * The first few functions handle EBML file parsing. The rest
345
 * is the document interpretation. Matroska really just is a
346
 * EBML file.
347
 */
348

    
349
/*
350
 * Return: the amount of levels in the hierarchy that the
351
 * current element lies higher than the previous one.
352
 * The opposite isn't done - that's auto-done using master
353
 * element reading.
354
 */
355

    
356
static int
357
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
358
{
359
    ByteIOContext *pb = &matroska->ctx->pb;
360
    offset_t pos = url_ftell(pb);
361
    int num = 0;
362

    
363
    while (matroska->num_levels > 0) {
364
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
365

    
366
        if (pos >= level->start + level->length) {
367
            matroska->num_levels--;
368
            num++;
369
        } else {
370
            break;
371
        }
372
    }
373

    
374
    return num;
375
}
376

    
377
/*
378
 * Read: an "EBML number", which is defined as a variable-length
379
 * array of bytes. The first byte indicates the length by giving a
380
 * number of 0-bits followed by a one. The position of the first
381
 * "one" bit inside the first byte indicates the length of this
382
 * number.
383
 * Returns: num. of bytes read. < 0 on error.
384
 */
385

    
386
static int
387
ebml_read_num (MatroskaDemuxContext *matroska,
388
               int                   max_size,
389
               uint64_t             *number)
390
{
391
    ByteIOContext *pb = &matroska->ctx->pb;
392
    int len_mask = 0x80, read = 1, n = 1;
393
    int64_t total = 0;
394

    
395
    /* the first byte tells us the length in bytes - get_byte() can normally
396
     * return 0, but since that's not a valid first ebmlID byte, we can
397
     * use it safely here to catch EOS. */
398
    if (!(total = get_byte(pb))) {
399
        /* we might encounter EOS here */
400
        if (!url_feof(pb)) {
401
            offset_t pos = url_ftell(pb);
402
            av_log(matroska->ctx, AV_LOG_ERROR,
403
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
404
                   pos, pos);
405
        }
406
        return AVERROR_IO; /* EOS or actual I/O error */
407
    }
408

    
409
    /* get the length of the EBML number */
410
    while (read <= max_size && !(total & len_mask)) {
411
        read++;
412
        len_mask >>= 1;
413
    }
414
    if (read > max_size) {
415
        offset_t pos = url_ftell(pb) - 1;
416
        av_log(matroska->ctx, AV_LOG_ERROR,
417
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
418
               (uint8_t) total, pos, pos);
419
        return AVERROR_INVALIDDATA;
420
    }
421

    
422
    /* read out length */
423
    total &= ~len_mask;
424
    while (n++ < read)
425
        total = (total << 8) | get_byte(pb);
426

    
427
    *number = total;
428

    
429
    return read;
430
}
431

    
432
/*
433
 * Read: the element content data ID.
434
 * Return: the number of bytes read or < 0 on error.
435
 */
436

    
437
static int
438
ebml_read_element_id (MatroskaDemuxContext *matroska,
439
                      uint32_t             *id,
440
                      int                  *level_up)
441
{
442
    int read;
443
    uint64_t total;
444

    
445
    /* if we re-call this, use our cached ID */
446
    if (matroska->peek_id != 0) {
447
        if (level_up)
448
            *level_up = 0;
449
        *id = matroska->peek_id;
450
        return 0;
451
    }
452

    
453
    /* read out the "EBML number", include tag in ID */
454
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
455
        return read;
456
    *id = matroska->peek_id  = total | (1 << (read * 7));
457

    
458
    /* level tracking */
459
    if (level_up)
460
        *level_up = ebml_read_element_level_up(matroska);
461

    
462
    return read;
463
}
464

    
465
/*
466
 * Read: element content length.
467
 * Return: the number of bytes read or < 0 on error.
468
 */
469

    
470
static int
471
ebml_read_element_length (MatroskaDemuxContext *matroska,
472
                          uint64_t             *length)
473
{
474
    /* clear cache since we're now beyond that data point */
475
    matroska->peek_id = 0;
476

    
477
    /* read out the "EBML number", include tag in ID */
478
    return ebml_read_num(matroska, 8, length);
479
}
480

    
481
/*
482
 * Return: the ID of the next element, or 0 on error.
483
 * Level_up contains the amount of levels that this
484
 * next element lies higher than the previous one.
485
 */
486

    
487
static uint32_t
488
ebml_peek_id (MatroskaDemuxContext *matroska,
489
              int                  *level_up)
490
{
491
    uint32_t id;
492

    
493
    assert(level_up != NULL);
494

    
495
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
496
        return 0;
497

    
498
    return id;
499
}
500

    
501
/*
502
 * Seek to a given offset.
503
 * 0 is success, -1 is failure.
504
 */
505

    
506
static int
507
ebml_read_seek (MatroskaDemuxContext *matroska,
508
                offset_t              offset)
509
{
510
    ByteIOContext *pb = &matroska->ctx->pb;
511

    
512
    /* clear ID cache, if any */
513
    matroska->peek_id = 0;
514

    
515
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
516
}
517

    
518
/*
519
 * Skip the next element.
520
 * 0 is success, -1 is failure.
521
 */
522

    
523
static int
524
ebml_read_skip (MatroskaDemuxContext *matroska)
525
{
526
    ByteIOContext *pb = &matroska->ctx->pb;
527
    uint32_t id;
528
    uint64_t length;
529
    int res;
530

    
531
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
532
        (res = ebml_read_element_length(matroska, &length)) < 0)
533
        return res;
534

    
535
    url_fskip(pb, length);
536

    
537
    return 0;
538
}
539

    
540
/*
541
 * Read the next element as an unsigned int.
542
 * 0 is success, < 0 is failure.
543
 */
544

    
545
static int
546
ebml_read_uint (MatroskaDemuxContext *matroska,
547
                uint32_t             *id,
548
                uint64_t             *num)
549
{
550
    ByteIOContext *pb = &matroska->ctx->pb;
551
    int n = 0, size, res;
552
    uint64_t rlength;
553

    
554
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
555
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
556
        return res;
557
    size = rlength;
558
    if (size < 1 || size > 8) {
559
        offset_t pos = url_ftell(pb);
560
        av_log(matroska->ctx, AV_LOG_ERROR,
561
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
562
                size, pos, pos);
563
        return AVERROR_INVALIDDATA;
564
    }
565

    
566
    /* big-endian ordening; build up number */
567
    *num = 0;
568
    while (n++ < size)
569
        *num = (*num << 8) | get_byte(pb);
570

    
571
    return 0;
572
}
573

    
574
/*
575
 * Read the next element as a signed int.
576
 * 0 is success, < 0 is failure.
577
 */
578

    
579
static int
580
ebml_read_sint (MatroskaDemuxContext *matroska,
581
                uint32_t             *id,
582
                int64_t              *num)
583
{
584
    ByteIOContext *pb = &matroska->ctx->pb;
585
    int size, n = 1, negative = 0, res;
586
    uint64_t rlength;
587

    
588
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
589
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
590
        return res;
591
    size = rlength;
592
    if (size < 1 || size > 8) {
593
        offset_t pos = url_ftell(pb);
594
        av_log(matroska->ctx, AV_LOG_ERROR,
595
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
596
                size, pos, pos);
597
        return AVERROR_INVALIDDATA;
598
    }
599
    if ((*num = get_byte(pb)) & 0x80) {
600
        negative = 1;
601
        *num &= ~0x80;
602
    }
603
    *num = 0;
604
    while (n++ < size)
605
        *num = (*num << 8) | get_byte(pb);
606

    
607
    /* make signed */
608
    if (negative)
609
        *num = *num - (1LL << ((8 * size) - 1));
610

    
611
    return 0;
612
}
613

    
614
/*
615
 * Read the next element as a float.
616
 * 0 is success, < 0 is failure.
617
 */
618

    
619
static int
620
ebml_read_float (MatroskaDemuxContext *matroska,
621
                 uint32_t             *id,
622
                 double               *num)
623
{
624
    ByteIOContext *pb = &matroska->ctx->pb;
625
    int size, res;
626
    uint64_t rlength;
627

    
628
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
629
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
630
        return res;
631
    size = rlength;
632

    
633
    if (size == 4) {
634
        *num= av_int2flt(get_be32(pb));
635
    } else if(size==8){
636
        *num= av_int2dbl(get_be64(pb));
637
    } else{
638
        offset_t pos = url_ftell(pb);
639
        av_log(matroska->ctx, AV_LOG_ERROR,
640
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
641
               size, pos, pos);
642
        return AVERROR_INVALIDDATA;
643
    }
644

    
645
    return 0;
646
}
647

    
648
/*
649
 * Read the next element as an ASCII string.
650
 * 0 is success, < 0 is failure.
651
 */
652

    
653
static int
654
ebml_read_ascii (MatroskaDemuxContext *matroska,
655
                 uint32_t             *id,
656
                 char                **str)
657
{
658
    ByteIOContext *pb = &matroska->ctx->pb;
659
    int size, res;
660
    uint64_t rlength;
661

    
662
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
663
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
664
        return res;
665
    size = rlength;
666

    
667
    /* ebml strings are usually not 0-terminated, so we allocate one
668
     * byte more, read the string and NULL-terminate it ourselves. */
669
    if (size < 0 || !(*str = av_malloc(size + 1))) {
670
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
671
        return AVERROR_NOMEM;
672
    }
673
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
674
        offset_t pos = url_ftell(pb);
675
        av_log(matroska->ctx, AV_LOG_ERROR,
676
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
677
        return AVERROR_IO;
678
    }
679
    (*str)[size] = '\0';
680

    
681
    return 0;
682
}
683

    
684
/*
685
 * Read the next element as a UTF-8 string.
686
 * 0 is success, < 0 is failure.
687
 */
688

    
689
static int
690
ebml_read_utf8 (MatroskaDemuxContext *matroska,
691
                uint32_t             *id,
692
                char                **str)
693
{
694
  return ebml_read_ascii(matroska, id, str);
695
}
696

    
697
/*
698
 * Read the next element as a date (nanoseconds since 1/1/2000).
699
 * 0 is success, < 0 is failure.
700
 */
701

    
702
static int
703
ebml_read_date (MatroskaDemuxContext *matroska,
704
                uint32_t             *id,
705
                int64_t              *date)
706
{
707
  return ebml_read_sint(matroska, id, date);
708
}
709

    
710
/*
711
 * Read the next element, but only the header. The contents
712
 * are supposed to be sub-elements which can be read separately.
713
 * 0 is success, < 0 is failure.
714
 */
715

    
716
static int
717
ebml_read_master (MatroskaDemuxContext *matroska,
718
                  uint32_t             *id)
719
{
720
    ByteIOContext *pb = &matroska->ctx->pb;
721
    uint64_t length;
722
    MatroskaLevel *level;
723
    int res;
724

    
725
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
726
        (res = ebml_read_element_length(matroska, &length)) < 0)
727
        return res;
728

    
729
    /* protect... (Heaven forbids that the '>' is true) */
730
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
731
        av_log(matroska->ctx, AV_LOG_ERROR,
732
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
733
        return AVERROR_NOTSUPP;
734
    }
735

    
736
    /* remember level */
737
    level = &matroska->levels[matroska->num_levels++];
738
    level->start = url_ftell(pb);
739
    level->length = length;
740

    
741
    return 0;
742
}
743

    
744
/*
745
 * Read the next element as binary data.
746
 * 0 is success, < 0 is failure.
747
 */
748

    
749
static int
750
ebml_read_binary (MatroskaDemuxContext *matroska,
751
                  uint32_t             *id,
752
                  uint8_t             **binary,
753
                  int                  *size)
754
{
755
    ByteIOContext *pb = &matroska->ctx->pb;
756
    uint64_t rlength;
757
    int res;
758

    
759
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
760
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
761
        return res;
762
    *size = rlength;
763

    
764
    if (!(*binary = av_malloc(*size))) {
765
        av_log(matroska->ctx, AV_LOG_ERROR,
766
               "Memory allocation error\n");
767
        return AVERROR_NOMEM;
768
    }
769

    
770
    if (get_buffer(pb, *binary, *size) != *size) {
771
        offset_t pos = url_ftell(pb);
772
        av_log(matroska->ctx, AV_LOG_ERROR,
773
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
774
        return AVERROR_IO;
775
    }
776

    
777
    return 0;
778
}
779

    
780
/*
781
 * Read signed/unsigned "EBML" numbers.
782
 * Return: number of bytes processed, < 0 on error.
783
 * XXX: use ebml_read_num().
784
 */
785

    
786
static int
787
matroska_ebmlnum_uint (uint8_t  *data,
788
                       uint32_t  size,
789
                       uint64_t *num)
790
{
791
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
792
    uint64_t total;
793

    
794
    if (size <= 0)
795
        return AVERROR_INVALIDDATA;
796

    
797
    total = data[0];
798
    while (read <= 8 && !(total & len_mask)) {
799
        read++;
800
        len_mask >>= 1;
801
    }
802
    if (read > 8)
803
        return AVERROR_INVALIDDATA;
804

    
805
    if ((total &= (len_mask - 1)) == len_mask - 1)
806
        num_ffs++;
807
    if (size < read)
808
        return AVERROR_INVALIDDATA;
809
    while (n < read) {
810
        if (data[n] == 0xff)
811
            num_ffs++;
812
        total = (total << 8) | data[n];
813
        n++;
814
    }
815

    
816
    if (read == num_ffs)
817
        *num = (uint64_t)-1;
818
    else
819
        *num = total;
820

    
821
    return read;
822
}
823

    
824
/*
825
 * Same as above, but signed.
826
 */
827

    
828
static int
829
matroska_ebmlnum_sint (uint8_t  *data,
830
                       uint32_t  size,
831
                       int64_t  *num)
832
{
833
    uint64_t unum;
834
    int res;
835

    
836
    /* read as unsigned number first */
837
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
838
        return res;
839

    
840
    /* make signed (weird way) */
841
    if (unum == (uint64_t)-1)
842
        *num = INT64_MAX;
843
    else
844
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
845

    
846
    return res;
847
}
848

    
849
/*
850
 * Read an EBML header.
851
 * 0 is success, < 0 is failure.
852
 */
853

    
854
static int
855
ebml_read_header (MatroskaDemuxContext *matroska,
856
                  char                **doctype,
857
                  int                  *version)
858
{
859
    uint32_t id;
860
    int level_up, res = 0;
861

    
862
    /* default init */
863
    if (doctype)
864
        *doctype = NULL;
865
    if (version)
866
        *version = 1;
867

    
868
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
869
        level_up != 0 || id != EBML_ID_HEADER) {
870
        av_log(matroska->ctx, AV_LOG_ERROR,
871
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
872
        return AVERROR_INVALIDDATA;
873
    }
874
    if ((res = ebml_read_master(matroska, &id)) < 0)
875
        return res;
876

    
877
    while (res == 0) {
878
        if (!(id = ebml_peek_id(matroska, &level_up)))
879
            return AVERROR_IO;
880

    
881
        /* end-of-header */
882
        if (level_up)
883
            break;
884

    
885
        switch (id) {
886
            /* is our read version uptodate? */
887
            case EBML_ID_EBMLREADVERSION: {
888
                uint64_t num;
889

    
890
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
891
                    return res;
892
                if (num > EBML_VERSION) {
893
                    av_log(matroska->ctx, AV_LOG_ERROR,
894
                           "EBML version %"PRIu64" (> %d) is not supported\n",
895
                           num, EBML_VERSION);
896
                    return AVERROR_INVALIDDATA;
897
                }
898
                break;
899
            }
900

    
901
            /* we only handle 8 byte lengths at max */
902
            case EBML_ID_EBMLMAXSIZELENGTH: {
903
                uint64_t num;
904

    
905
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
906
                    return res;
907
                if (num > sizeof(uint64_t)) {
908
                    av_log(matroska->ctx, AV_LOG_ERROR,
909
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
910
                           num, sizeof(uint64_t));
911
                    return AVERROR_INVALIDDATA;
912
                }
913
                break;
914
            }
915

    
916
            /* we handle 4 byte IDs at max */
917
            case EBML_ID_EBMLMAXIDLENGTH: {
918
                uint64_t num;
919

    
920
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
921
                    return res;
922
                if (num > sizeof(uint32_t)) {
923
                    av_log(matroska->ctx, AV_LOG_ERROR,
924
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
925
                            num, sizeof(uint32_t));
926
                    return AVERROR_INVALIDDATA;
927
                }
928
                break;
929
            }
930

    
931
            case EBML_ID_DOCTYPE: {
932
                char *text;
933

    
934
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
935
                    return res;
936
                if (doctype) {
937
                    if (*doctype)
938
                        av_free(*doctype);
939
                    *doctype = text;
940
                } else
941
                    av_free(text);
942
                break;
943
            }
944

    
945
            case EBML_ID_DOCTYPEREADVERSION: {
946
                uint64_t num;
947

    
948
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
949
                    return res;
950
                if (version)
951
                    *version = num;
952
                break;
953
            }
954

    
955
            default:
956
                av_log(matroska->ctx, AV_LOG_INFO,
957
                       "Unknown data type 0x%x in EBML header", id);
958
                /* pass-through */
959

    
960
            case EBML_ID_VOID:
961
            /* we ignore these two, as they don't tell us anything we
962
             * care about */
963
            case EBML_ID_EBMLVERSION:
964
            case EBML_ID_DOCTYPEVERSION:
965
                res = ebml_read_skip (matroska);
966
                break;
967
        }
968
    }
969

    
970
    return 0;
971
}
972

    
973
/*
974
 * Put one packet in an application-supplied AVPacket struct.
975
 * Returns 0 on success or -1 on failure.
976
 */
977

    
978
static int
979
matroska_deliver_packet (MatroskaDemuxContext *matroska,
980
                         AVPacket             *pkt)
981
{
982
    if (matroska->num_packets > 0) {
983
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
984
        av_free(matroska->packets[0]);
985
        if (matroska->num_packets > 1) {
986
            memmove(&matroska->packets[0], &matroska->packets[1],
987
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
988
            matroska->packets =
989
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
990
                           sizeof(AVPacket *));
991
        } else {
992
            av_free(matroska->packets);
993
            matroska->packets = NULL;
994
        }
995
        matroska->num_packets--;
996
        return 0;
997
    }
998

    
999
    return -1;
1000
}
1001

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

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

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

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

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

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

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

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

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

    
1061
    return 0;
1062
}
1063

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1153
    return res;
1154
}
1155

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1606
    return res;
1607
}
1608

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

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

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

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

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

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

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

    
1648
    return res;
1649
}
1650

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1755
                            break;
1756

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

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

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

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

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

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

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

    
1806
    return res;
1807
}
1808

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

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

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

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

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

    
1842
    return res;
1843
}
1844

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1956
                        /* read master + parse */
1957
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1958
                            break;
1959
                        switch (id) {
1960
                            case MATROSKA_ID_CUES:
1961
                                if (!(res = matroska_parse_index(matroska)) ||
1962
                                    url_feof(&matroska->ctx->pb)) {
1963
                                    matroska->index_parsed = 1;
1964
                                    res = 0;
1965
                                }
1966
                                break;
1967
                            case MATROSKA_ID_TAGS:
1968
                                if (!(res = matroska_parse_metadata(matroska)) ||
1969
                                   url_feof(&matroska->ctx->pb)) {
1970
                                    matroska->metadata_parsed = 1;
1971
                                    res = 0;
1972
                                }
1973
                                break;
1974
                        }
1975
                        if (res < 0)
1976
                            break;
1977

    
1978
                    finish:
1979
                        /* remove dummy level */
1980
                        while (matroska->num_levels) {
1981
                            matroska->num_levels--;
1982
                            length =
1983
                                matroska->levels[matroska->num_levels].length;
1984
                            if (length == (uint64_t)-1)
1985
                                break;
1986
                        }
1987

    
1988
                        /* seek back */
1989
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1990
                            return res;
1991
                        matroska->peek_id = peek_id_cache;
1992
                        matroska->level_up = level_up;
1993
                        break;
1994
                    }
1995

    
1996
                    default:
1997
                        av_log(matroska->ctx, AV_LOG_INFO,
1998
                               "Ignoring seekhead entry for ID=0x%x\n",
1999
                               seek_id);
2000
                        break;
2001
                }
2002

    
2003
                break;
2004
            }
2005

    
2006
            default:
2007
                av_log(matroska->ctx, AV_LOG_INFO,
2008
                       "Unknown seekhead ID 0x%x\n", id);
2009
                /* fall-through */
2010

    
2011
            case EBML_ID_VOID:
2012
                res = ebml_read_skip(matroska);
2013
                break;
2014
        }
2015

    
2016
        if (matroska->level_up) {
2017
            matroska->level_up--;
2018
            break;
2019
        }
2020
    }
2021

    
2022
    return res;
2023
}
2024

    
2025
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2026

    
2027
static int
2028
matroska_aac_profile (char *codec_id)
2029
{
2030
    static const char *aac_profiles[] = {
2031
        "MAIN", "LC", "SSR"
2032
    };
2033
    int profile;
2034

    
2035
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2036
        if (strstr(codec_id, aac_profiles[profile]))
2037
            break;
2038
    return profile + 1;
2039
}
2040

    
2041
static int
2042
matroska_aac_sri (int samplerate)
2043
{
2044
    static const int aac_sample_rates[] = {
2045
        96000, 88200, 64000, 48000, 44100, 32000,
2046
        24000, 22050, 16000, 12000, 11025,  8000,
2047
    };
2048
    int sri;
2049

    
2050
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2051
        if (aac_sample_rates[sri] == samplerate)
2052
            break;
2053
    return sri;
2054
}
2055

    
2056
static int
2057
matroska_read_header (AVFormatContext    *s,
2058
                      AVFormatParameters *ap)
2059
{
2060
    MatroskaDemuxContext *matroska = s->priv_data;
2061
    char *doctype;
2062
    int version, last_level, res = 0;
2063
    uint32_t id;
2064

    
2065
    matroska->ctx = s;
2066

    
2067
    /* First read the EBML header. */
2068
    doctype = NULL;
2069
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2070
        return res;
2071
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2072
        av_log(matroska->ctx, AV_LOG_ERROR,
2073
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2074
               doctype ? doctype : "(none)");
2075
        if (doctype)
2076
            av_free(doctype);
2077
        return AVERROR_NOFMT;
2078
    }
2079
    av_free(doctype);
2080
    if (version != 1) {
2081
        av_log(matroska->ctx, AV_LOG_ERROR,
2082
               "Matroska demuxer version 1 too old for file version %d\n",
2083
               version);
2084
        return AVERROR_NOFMT;
2085
    }
2086

    
2087
    /* The next thing is a segment. */
2088
    while (1) {
2089
        if (!(id = ebml_peek_id(matroska, &last_level)))
2090
            return AVERROR_IO;
2091
        if (id == MATROSKA_ID_SEGMENT)
2092
            break;
2093

    
2094
        /* oi! */
2095
        av_log(matroska->ctx, AV_LOG_INFO,
2096
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2097
               MATROSKA_ID_SEGMENT, id);
2098
        if ((res = ebml_read_skip(matroska)) < 0)
2099
            return res;
2100
    }
2101

    
2102
    /* We now have a Matroska segment.
2103
     * Seeks are from the beginning of the segment,
2104
     * after the segment ID/length. */
2105
    if ((res = ebml_read_master(matroska, &id)) < 0)
2106
        return res;
2107
    matroska->segment_start = url_ftell(&s->pb);
2108

    
2109
    matroska->time_scale = 1000000;
2110
    /* we've found our segment, start reading the different contents in here */
2111
    while (res == 0) {
2112
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2113
            res = AVERROR_IO;
2114
            break;
2115
        } else if (matroska->level_up) {
2116
            matroska->level_up--;
2117
            break;
2118
        }
2119

    
2120
        switch (id) {
2121
            /* stream info */
2122
            case MATROSKA_ID_INFO: {
2123
                if ((res = ebml_read_master(matroska, &id)) < 0)
2124
                    break;
2125
                res = matroska_parse_info(matroska);
2126
                break;
2127
            }
2128

    
2129
            /* track info headers */
2130
            case MATROSKA_ID_TRACKS: {
2131
                if ((res = ebml_read_master(matroska, &id)) < 0)
2132
                    break;
2133
                res = matroska_parse_tracks(matroska);
2134
                break;
2135
            }
2136

    
2137
            /* stream index */
2138
            case MATROSKA_ID_CUES: {
2139
                if (!matroska->index_parsed) {
2140
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2141
                        break;
2142
                    res = matroska_parse_index(matroska);
2143
                } else
2144
                    res = ebml_read_skip(matroska);
2145
                break;
2146
            }
2147

    
2148
            /* metadata */
2149
            case MATROSKA_ID_TAGS: {
2150
                if (!matroska->metadata_parsed) {
2151
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2152
                        break;
2153
                    res = matroska_parse_metadata(matroska);
2154
                } else
2155
                    res = ebml_read_skip(matroska);
2156
                break;
2157
            }
2158

    
2159
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2160
            case MATROSKA_ID_SEEKHEAD: {
2161
                if ((res = ebml_read_master(matroska, &id)) < 0)
2162
                    break;
2163
                res = matroska_parse_seekhead(matroska);
2164
                break;
2165
            }
2166

    
2167
            case MATROSKA_ID_CLUSTER: {
2168
                /* Do not read the master - this will be done in the next
2169
                 * call to matroska_read_packet. */
2170
                res = 1;
2171
                break;
2172
            }
2173

    
2174
            default:
2175
                av_log(matroska->ctx, AV_LOG_INFO,
2176
                       "Unknown matroska file header ID 0x%x\n", id);
2177
            /* fall-through */
2178

    
2179
            case EBML_ID_VOID:
2180
                res = ebml_read_skip(matroska);
2181
                break;
2182
        }
2183

    
2184
        if (matroska->level_up) {
2185
            matroska->level_up--;
2186
            break;
2187
        }
2188
    }
2189

    
2190
    /* Have we found a cluster? */
2191
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2192
        int i, j;
2193
        MatroskaTrack *track;
2194
        AVStream *st;
2195

    
2196
        for (i = 0; i < matroska->num_tracks; i++) {
2197
            enum CodecID codec_id = CODEC_ID_NONE;
2198
            uint8_t *extradata = NULL;
2199
            int extradata_size = 0;
2200
            track = matroska->tracks[i];
2201

    
2202
            /* libavformat does not really support subtitles.
2203
             * Also apply some sanity checks. */
2204
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2205
                (track->codec_id == NULL))
2206
                continue;
2207

    
2208
            for(j=0; codec_tags[j].str; j++){
2209
                if(!strncmp(codec_tags[j].str, track->codec_id,
2210
                            strlen(codec_tags[j].str))){
2211
                    codec_id= codec_tags[j].id;
2212
                    break;
2213
                }
2214
            }
2215

    
2216
            /* Set the FourCC from the CodecID. */
2217
            /* This is the MS compatibility mode which stores a
2218
             * BITMAPINFOHEADER in the CodecPrivate. */
2219
            if (!strcmp(track->codec_id,
2220
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2221
                (track->codec_priv_size >= 40) &&
2222
                (track->codec_priv != NULL)) {
2223
                unsigned char *p;
2224

    
2225
                /* Offset of biCompression. Stored in LE. */
2226
                p = (unsigned char *)track->codec_priv + 16;
2227
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2228
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2229
                codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2230

    
2231
            }
2232

    
2233
            /* This is the MS compatibility mode which stores a
2234
             * WAVEFORMATEX in the CodecPrivate. */
2235
            else if (!strcmp(track->codec_id,
2236
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2237
                (track->codec_priv_size >= 18) &&
2238
                (track->codec_priv != NULL)) {
2239
                unsigned char *p;
2240
                uint16_t tag;
2241

    
2242
                /* Offset of wFormatTag. Stored in LE. */
2243
                p = (unsigned char *)track->codec_priv;
2244
                tag = (p[1] << 8) | p[0];
2245
                codec_id = codec_get_wav_id(tag);
2246

    
2247
            }
2248

    
2249
            if (codec_id==CODEC_ID_AAC || codec_id==CODEC_ID_MPEG4AAC) {
2250
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2251
                int profile = matroska_aac_profile(track->codec_id);
2252
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2253
                extradata = av_malloc(5);
2254
                if (extradata == NULL)
2255
                    return AVERROR_NOMEM;
2256
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2257
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2258
                if (strstr(track->codec_id, "SBR")) {
2259
                    sri = matroska_aac_sri(audiotrack->samplerate);
2260
                    extradata[2] = 0x56;
2261
                    extradata[3] = 0xE5;
2262
                    extradata[4] = 0x80 | (sri<<3);
2263
                    extradata_size = 5;
2264
                } else {
2265
                    extradata_size = 2;
2266
                }
2267
            }
2268

    
2269
            if (codec_id == CODEC_ID_NONE) {
2270
                av_log(matroska->ctx, AV_LOG_INFO,
2271
                       "Unknown/unsupported CodecID %s.\n",
2272
                       track->codec_id);
2273
            }
2274

    
2275
            track->stream_index = matroska->num_streams;
2276

    
2277
            matroska->num_streams++;
2278
            st = av_new_stream(s, track->stream_index);
2279
            if (st == NULL)
2280
                return AVERROR_NOMEM;
2281
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2282

    
2283
            st->codec->codec_id = codec_id;
2284

    
2285
            if (track->default_duration)
2286
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2287
                          track->default_duration, 1000000000, 30000);
2288

    
2289
            if(extradata){
2290
                st->codec->extradata = extradata;
2291
                st->codec->extradata_size = extradata_size;
2292
            } else if(track->codec_priv && track->codec_priv_size > 0){
2293
                st->codec->extradata = av_malloc(track->codec_priv_size);
2294
                if(st->codec->extradata == NULL)
2295
                    return AVERROR_NOMEM;
2296
                st->codec->extradata_size = track->codec_priv_size;
2297
                memcpy(st->codec->extradata, track->codec_priv,
2298
                       track->codec_priv_size);
2299
            }
2300

    
2301
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2302
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2303

    
2304
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2305
                st->codec->codec_tag = videotrack->fourcc;
2306
                st->codec->width = videotrack->pixel_width;
2307
                st->codec->height = videotrack->pixel_height;
2308
                if (videotrack->display_width == 0)
2309
                    videotrack->display_width= videotrack->pixel_width;
2310
                if (videotrack->display_height == 0)
2311
                    videotrack->display_height= videotrack->pixel_height;
2312
                av_reduce(&st->codec->sample_aspect_ratio.num,
2313
                          &st->codec->sample_aspect_ratio.den,
2314
                          st->codec->height * videotrack->display_width,
2315
                          st->codec-> width * videotrack->display_height,
2316
                          255);
2317
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2318
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2319

    
2320
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2321
                st->codec->sample_rate = audiotrack->samplerate;
2322
                st->codec->channels = audiotrack->channels;
2323
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2324
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2325
            }
2326

    
2327
            /* What do we do with private data? E.g. for Vorbis. */
2328
        }
2329
        res = 0;
2330
    }
2331

    
2332
    return res;
2333
}
2334

    
2335
static int
2336
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2337
                            int                   num)
2338
{
2339
    int i;
2340

    
2341
    for (i = 0; i < matroska->num_tracks; i++)
2342
        if (matroska->tracks[i]->num == num)
2343
            return i;
2344

    
2345
    return -1;
2346
}
2347

    
2348
static int
2349
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2350
                           uint64_t              cluster_time)
2351
{
2352
    int res = 0;
2353
    uint32_t id;
2354
    AVPacket *pkt = NULL;
2355
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2356
    uint64_t duration = AV_NOPTS_VALUE;
2357
    int track = -1;
2358

    
2359
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2360

    
2361
    while (res == 0) {
2362
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2363
            res = AVERROR_IO;
2364
            break;
2365
        } else if (matroska->level_up) {
2366
            matroska->level_up--;
2367
            break;
2368
        }
2369

    
2370
        switch (id) {
2371
            /* one block inside the group. Note, block parsing is one
2372
             * of the harder things, so this code is a bit complicated.
2373
             * See http://www.matroska.org/ for documentation. */
2374
            case MATROSKA_ID_BLOCK: {
2375
                uint8_t *data, *origdata;
2376
                int size;
2377
                int16_t block_time;
2378
                uint32_t *lace_size = NULL;
2379
                int n, flags, laces = 0;
2380
                uint64_t num;
2381
                int64_t pos= url_ftell(&matroska->ctx->pb);
2382

    
2383
                if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2384
                    break;
2385
                origdata = data;
2386

    
2387
                /* first byte(s): blocknum */
2388
                if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2389
                    av_log(matroska->ctx, AV_LOG_ERROR,
2390
                           "EBML block data error\n");
2391
                    av_free(origdata);
2392
                    break;
2393
                }
2394
                data += n;
2395
                size -= n;
2396

    
2397
                /* fetch track from num */
2398
                track = matroska_find_track_by_num(matroska, num);
2399
                if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2400
                    av_log(matroska->ctx, AV_LOG_INFO,
2401
                           "Invalid stream %d or size %u\n", track, size);
2402
                    av_free(origdata);
2403
                    break;
2404
                }
2405
                if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2406
                    av_free(origdata);
2407
                    break;
2408
                }
2409

    
2410
                /* block_time (relative to cluster time) */
2411
                block_time = (data[0] << 8) | data[1];
2412
                data += 2;
2413
                size -= 2;
2414
                flags = *data;
2415
                data += 1;
2416
                size -= 1;
2417
                switch ((flags & 0x06) >> 1) {
2418
                    case 0x0: /* no lacing */
2419
                        laces = 1;
2420
                        lace_size = av_mallocz(sizeof(int));
2421
                        lace_size[0] = size;
2422
                        break;
2423

    
2424
                    case 0x1: /* xiph lacing */
2425
                    case 0x2: /* fixed-size lacing */
2426
                    case 0x3: /* EBML lacing */
2427
                        if (size == 0) {
2428
                            res = -1;
2429
                            break;
2430
                        }
2431
                        laces = (*data) + 1;
2432
                        data += 1;
2433
                        size -= 1;
2434
                        lace_size = av_mallocz(laces * sizeof(int));
2435

    
2436
                        switch ((flags & 0x06) >> 1) {
2437
                            case 0x1: /* xiph lacing */ {
2438
                                uint8_t temp;
2439
                                uint32_t total = 0;
2440
                                for (n = 0; res == 0 && n < laces - 1; n++) {
2441
                                    while (1) {
2442
                                        if (size == 0) {
2443
                                            res = -1;
2444
                                            break;
2445
                                        }
2446
                                        temp = *data;
2447
                                        lace_size[n] += temp;
2448
                                        data += 1;
2449
                                        size -= 1;
2450
                                        if (temp != 0xff)
2451
                                            break;
2452
                                    }
2453
                                    total += lace_size[n];
2454
                                }
2455
                                lace_size[n] = size - total;
2456
                                break;
2457
                            }
2458

    
2459
                            case 0x2: /* fixed-size lacing */
2460
                                for (n = 0; n < laces; n++)
2461
                                    lace_size[n] = size / laces;
2462
                                break;
2463

    
2464
                            case 0x3: /* EBML lacing */ {
2465
                                uint32_t total;
2466
                                n = matroska_ebmlnum_uint(data, size, &num);
2467
                                if (n < 0) {
2468
                                    av_log(matroska->ctx, AV_LOG_INFO,
2469
                                           "EBML block data error\n");
2470
                                    break;
2471
                                }
2472
                                data += n;
2473
                                size -= n;
2474
                                total = lace_size[0] = num;
2475
                                for (n = 1; res == 0 && n < laces - 1; n++) {
2476
                                    int64_t snum;
2477
                                    int r;
2478
                                    r = matroska_ebmlnum_sint (data, size,
2479
                                                               &snum);
2480
                                    if (r < 0) {
2481
                                        av_log(matroska->ctx, AV_LOG_INFO,
2482
                                               "EBML block data error\n");
2483
                                        break;
2484
                                    }
2485
                                    data += r;
2486
                                    size -= r;
2487
                                    lace_size[n] = lace_size[n - 1] + snum;
2488
                                    total += lace_size[n];
2489
                                }
2490
                                lace_size[n] = size - total;
2491
                                break;
2492
                            }
2493
                        }
2494
                        break;
2495
                }
2496

    
2497
                if (res == 0) {
2498
                    for (n = 0; n < laces; n++) {
2499
                        uint64_t timecode = AV_NOPTS_VALUE;
2500

    
2501
                        pkt = av_mallocz(sizeof(AVPacket));
2502
                        /* XXX: prevent data copy... */
2503
                        if (av_new_packet(pkt,lace_size[n]) < 0) {
2504
                            res = AVERROR_NOMEM;
2505
                            break;
2506
                        }
2507
                        if (cluster_time != (uint64_t)-1 && n == 0) {
2508
                            if (cluster_time + block_time >= 0)
2509
                                timecode = cluster_time + block_time;
2510
                        }
2511
                        /* FIXME: duration */
2512

    
2513
                        memcpy(pkt->data, data, lace_size[n]);
2514
                        data += lace_size[n];
2515
                        if (n == 0)
2516
                            pkt->flags = is_keyframe;
2517
                        pkt->stream_index =
2518
                            matroska->tracks[track]->stream_index;
2519

    
2520
                        pkt->pts = timecode;
2521
                        pkt->pos= pos;
2522

    
2523
                        matroska_queue_packet(matroska, pkt);
2524
                    }
2525
                }
2526

    
2527
                av_free(lace_size);
2528
                av_free(origdata);
2529
                break;
2530
            }
2531

    
2532
            case MATROSKA_ID_BLOCKDURATION: {
2533
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2534
                    break;
2535
                break;
2536
            }
2537

    
2538
            case MATROSKA_ID_BLOCKREFERENCE:
2539
                /* We've found a reference, so not even the first frame in
2540
                 * the lace is a key frame. */
2541
                is_keyframe = 0;
2542
                if (last_num_packets != matroska->num_packets)
2543
                    matroska->packets[last_num_packets]->flags = 0;
2544
                res = ebml_read_skip(matroska);
2545
                break;
2546

    
2547
            default:
2548
                av_log(matroska->ctx, AV_LOG_INFO,
2549
                       "Unknown entry 0x%x in blockgroup data\n", id);
2550
                /* fall-through */
2551

    
2552
            case EBML_ID_VOID:
2553
                res = ebml_read_skip(matroska);
2554
                break;
2555
        }
2556

    
2557
        if (matroska->level_up) {
2558
            matroska->level_up--;
2559
            break;
2560
        }
2561
    }
2562

    
2563
    if (pkt)
2564
    {
2565
        if (duration != AV_NOPTS_VALUE)
2566
            pkt->duration = duration;
2567
        else if (track >= 0 && track < matroska->num_tracks)
2568
            pkt->duration = matroska->tracks[track]->default_duration / matroska->time_scale;
2569
    }
2570

    
2571
    return res;
2572
}
2573

    
2574
static int
2575
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2576
{
2577
    int res = 0;
2578
    uint32_t id;
2579
    uint64_t cluster_time = 0;
2580

    
2581
    av_log(matroska->ctx, AV_LOG_DEBUG,
2582
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2583

    
2584
    while (res == 0) {
2585
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2586
            res = AVERROR_IO;
2587
            break;
2588
        } else if (matroska->level_up) {
2589
            matroska->level_up--;
2590
            break;
2591
        }
2592

    
2593
        switch (id) {
2594
            /* cluster timecode */
2595
            case MATROSKA_ID_CLUSTERTIMECODE: {
2596
                uint64_t num;
2597
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2598
                    break;
2599
                cluster_time = num;
2600
                break;
2601
            }
2602

    
2603
                /* a group of blocks inside a cluster */
2604
            case MATROSKA_ID_BLOCKGROUP:
2605
                if ((res = ebml_read_master(matroska, &id)) < 0)
2606
                    break;
2607
                res = matroska_parse_blockgroup(matroska, cluster_time);
2608
                break;
2609

    
2610
            default:
2611
                av_log(matroska->ctx, AV_LOG_INFO,
2612
                       "Unknown entry 0x%x in cluster data\n", id);
2613
                /* fall-through */
2614

    
2615
            case EBML_ID_VOID:
2616
                res = ebml_read_skip(matroska);
2617
                break;
2618
        }
2619

    
2620
        if (matroska->level_up) {
2621
            matroska->level_up--;
2622
            break;
2623
        }
2624
    }
2625

    
2626
    return res;
2627
}
2628

    
2629
static int
2630
matroska_read_packet (AVFormatContext *s,
2631
                      AVPacket        *pkt)
2632
{
2633
    MatroskaDemuxContext *matroska = s->priv_data;
2634
    int res = 0;
2635
    uint32_t id;
2636

    
2637
    /* Do we still have a packet queued? */
2638
    if (matroska_deliver_packet(matroska, pkt) == 0)
2639
        return 0;
2640

    
2641
    /* Have we already reached the end? */
2642
    if (matroska->done)
2643
        return AVERROR_IO;
2644

    
2645
    while (res == 0) {
2646
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2647
            res = AVERROR_IO;
2648
            break;
2649
        } else if (matroska->level_up) {
2650
            matroska->level_up--;
2651
            break;
2652
        }
2653

    
2654
        switch (id) {
2655
            case MATROSKA_ID_CLUSTER:
2656
                if ((res = ebml_read_master(matroska, &id)) < 0)
2657
                    break;
2658
                if ((res = matroska_parse_cluster(matroska)) == 0)
2659
                    res = 1; /* Parsed one cluster, let's get out. */
2660
                break;
2661

    
2662
            default:
2663
            case EBML_ID_VOID:
2664
                res = ebml_read_skip(matroska);
2665
                break;
2666
        }
2667

    
2668
        if (matroska->level_up) {
2669
            matroska->level_up--;
2670
            break;
2671
        }
2672
    }
2673

    
2674
    if (res == -1)
2675
        matroska->done = 1;
2676

    
2677
    return matroska_deliver_packet(matroska, pkt);
2678
}
2679

    
2680
static int
2681
matroska_read_close (AVFormatContext *s)
2682
{
2683
    MatroskaDemuxContext *matroska = s->priv_data;
2684
    int n = 0;
2685

    
2686
    av_free(matroska->writing_app);
2687
    av_free(matroska->muxing_app);
2688
    av_free(matroska->index);
2689

    
2690
    if (matroska->packets != NULL) {
2691
        for (n = 0; n < matroska->num_packets; n++) {
2692
            av_free_packet(matroska->packets[n]);
2693
            av_free(matroska->packets[n]);
2694
        }
2695
        av_free(matroska->packets);
2696
    }
2697

    
2698
    for (n = 0; n < matroska->num_tracks; n++) {
2699
        MatroskaTrack *track = matroska->tracks[n];
2700
        av_free(track->codec_id);
2701
        av_free(track->codec_name);
2702
        av_free(track->codec_priv);
2703
        av_free(track->name);
2704
        av_free(track->language);
2705

    
2706
        av_free(track);
2707
    }
2708

    
2709
    return 0;
2710
}
2711

    
2712
AVInputFormat matroska_demuxer = {
2713
    "matroska",
2714
    "Matroska file format",
2715
    sizeof(MatroskaDemuxContext),
2716
    matroska_probe,
2717
    matroska_read_header,
2718
    matroska_read_packet,
2719
    matroska_read_close,
2720
};