Statistics
| Branch: | Revision:

ffmpeg / libavformat / matroskadec.c @ 8ecdab8f

History | View | Annotate | Download (76.1 KB)

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

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

    
31
#include "avformat.h"
32
/* For codec_get_id(). */
33
#include "riff.h"
34
#include "isom.h"
35
#include "matroska.h"
36
#include "libavcodec/mpeg4audio.h"
37
#include "libavutil/intfloat_readwrite.h"
38
#include "libavutil/avstring.h"
39
#include "libavutil/lzo.h"
40
#ifdef CONFIG_ZLIB
41
#include <zlib.h>
42
#endif
43
#ifdef CONFIG_BZLIB
44
#include <bzlib.h>
45
#endif
46

    
47
typedef enum {
48
    EBML_NONE,
49
    EBML_UINT,
50
    EBML_FLOAT,
51
    EBML_STR,
52
    EBML_UTF8,
53
    EBML_BIN,
54
    EBML_NEST,
55
    EBML_PASS,
56
    EBML_STOP,
57
} EbmlType;
58

    
59
typedef const struct EbmlSyntax {
60
    uint32_t id;
61
    EbmlType type;
62
    int list_elem_size;
63
    int data_offset;
64
    union {
65
        uint64_t    u;
66
        double      f;
67
        const char *s;
68
        const struct EbmlSyntax *n;
69
    } def;
70
} EbmlSyntax;
71

    
72
typedef struct {
73
    int nb_elem;
74
    void *elem;
75
} EbmlList;
76

    
77
typedef struct {
78
    int      size;
79
    uint8_t *data;
80
    int64_t  pos;
81
} EbmlBin;
82

    
83
typedef struct {
84
    uint64_t version;
85
    uint64_t max_size;
86
    uint64_t id_length;
87
    char    *doctype;
88
    uint64_t doctype_version;
89
} Ebml;
90

    
91
typedef struct {
92
    uint64_t algo;
93
    EbmlBin  settings;
94
} MatroskaTrackCompression;
95

    
96
typedef struct {
97
    uint64_t scope;
98
    uint64_t type;
99
    MatroskaTrackCompression compression;
100
} MatroskaTrackEncoding;
101

    
102
typedef struct {
103
    double   frame_rate;
104
    uint64_t display_width;
105
    uint64_t display_height;
106
    uint64_t pixel_width;
107
    uint64_t pixel_height;
108
    uint64_t fourcc;
109
} MatroskaTrackVideo;
110

    
111
typedef struct {
112
    double   samplerate;
113
    double   out_samplerate;
114
    uint64_t bitdepth;
115
    uint64_t channels;
116

    
117
    /* real audio header (extracted from extradata) */
118
    int      coded_framesize;
119
    int      sub_packet_h;
120
    int      frame_size;
121
    int      sub_packet_size;
122
    int      sub_packet_cnt;
123
    int      pkt_cnt;
124
    uint8_t *buf;
125
} MatroskaTrackAudio;
126

    
127
typedef struct {
128
    uint64_t num;
129
    uint64_t type;
130
    char    *codec_id;
131
    EbmlBin  codec_priv;
132
    char    *language;
133
    double time_scale;
134
    uint64_t default_duration;
135
    uint64_t flag_default;
136
    MatroskaTrackVideo video;
137
    MatroskaTrackAudio audio;
138
    EbmlList encodings;
139

    
140
    AVStream *stream;
141
} MatroskaTrack;
142

    
143
typedef struct {
144
    char *filename;
145
    char *mime;
146
    EbmlBin bin;
147
} MatroskaAttachement;
148

    
149
typedef struct {
150
    uint64_t start;
151
    uint64_t end;
152
    uint64_t uid;
153
    char    *title;
154
} MatroskaChapter;
155

    
156
typedef struct {
157
    uint64_t track;
158
    uint64_t pos;
159
} MatroskaIndexPos;
160

    
161
typedef struct {
162
    uint64_t time;
163
    EbmlList pos;
164
} MatroskaIndex;
165

    
166
typedef struct MatroskaLevel {
167
    uint64_t start;
168
    uint64_t length;
169
} MatroskaLevel;
170

    
171
typedef struct MatroskaDemuxContext {
172
    AVFormatContext *ctx;
173

    
174
    /* ebml stuff */
175
    int num_levels;
176
    MatroskaLevel levels[EBML_MAX_DEPTH];
177
    int level_up;
178

    
179
    /* timescale in the file */
180
    uint64_t time_scale;
181
    double   duration;
182
    char    *title;
183
    EbmlList tracks;
184
    EbmlList attachments;
185
    EbmlList chapters;
186
    EbmlList index;
187

    
188
    /* num_streams is the number of streams that av_new_stream() was called
189
     * for ( = that are available to the calling program). */
190
    int num_streams;
191

    
192
    /* cache for ID peeking */
193
    uint32_t peek_id;
194

    
195
    /* byte position of the segment inside the stream */
196
    offset_t segment_start;
197

    
198
    /* The packet queue. */
199
    AVPacket **packets;
200
    int num_packets;
201

    
202
    /* have we already parse metadata/cues/clusters? */
203
    int metadata_parsed;
204
    int index_parsed;
205
    int done;
206

    
207
    /* What to skip before effectively reading a packet. */
208
    int skip_to_keyframe;
209
    AVStream *skip_to_stream;
210
} MatroskaDemuxContext;
211

    
212
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
213

    
214
static EbmlSyntax ebml_header[] = {
215
    { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
216
    { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
217
    { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
218
    { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
219
    { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
220
    { EBML_ID_EBMLVERSION,            EBML_NONE },
221
    { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
222
    { EBML_ID_VOID,                   EBML_NONE },
223
    { 0 }
224
};
225

    
226
static EbmlSyntax ebml_syntax[] = {
227
    { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
228
    { 0 }
229
};
230

    
231
static EbmlSyntax matroska_info[] = {
232
    { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
233
    { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
234
    { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
235
    { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
236
    { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
237
    { MATROSKA_ID_DATEUTC,            EBML_NONE },
238
    { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
239
    { EBML_ID_VOID,                   EBML_NONE },
240
    { 0 }
241
};
242

    
243
static EbmlSyntax matroska_track_video[] = {
244
    { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
245
    { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
246
    { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
247
    { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
248
    { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
249
    { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
250
    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
251
    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
252
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
253
    { EBML_ID_VOID,                   EBML_NONE },
254
    { 0 }
255
};
256

    
257
static EbmlSyntax matroska_track_audio[] = {
258
    { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
259
    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
260
    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
261
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
262
    { EBML_ID_VOID,                   EBML_NONE },
263
    { 0 }
264
};
265

    
266
static EbmlSyntax matroska_track_encoding_compression[] = {
267
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
268
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
269
    { EBML_ID_VOID,                   EBML_NONE },
270
    { 0 }
271
};
272

    
273
static EbmlSyntax matroska_track_encoding[] = {
274
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
275
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
276
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
277
    { EBML_ID_VOID,                   EBML_NONE },
278
    { 0 }
279
};
280

    
281
static EbmlSyntax matroska_track_encodings[] = {
282
    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
283
    { EBML_ID_VOID,                   EBML_NONE },
284
    { 0 }
285
};
286

    
287
static EbmlSyntax matroska_track[] = {
288
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
289
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
290
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
291
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
292
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
293
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
294
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
295
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
296
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
297
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
298
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
299
    { MATROSKA_ID_TRACKUID,             EBML_NONE },
300
    { MATROSKA_ID_TRACKNAME,            EBML_NONE },
301
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
302
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
303
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
304
    { MATROSKA_ID_CODECNAME,            EBML_NONE },
305
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
306
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
307
    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
308
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
309
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
310
    { EBML_ID_VOID,                     EBML_NONE },
311
    { 0 }
312
};
313

    
314
static EbmlSyntax matroska_tracks[] = {
315
    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
316
    { EBML_ID_VOID,                   EBML_NONE },
317
    { 0 }
318
};
319

    
320
static EbmlSyntax matroska_attachment[] = {
321
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
322
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
323
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
324
    { MATROSKA_ID_FILEUID,            EBML_NONE },
325
    { EBML_ID_VOID,                   EBML_NONE },
326
    { 0 }
327
};
328

    
329
static EbmlSyntax matroska_attachments[] = {
330
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
331
    { EBML_ID_VOID,                   EBML_NONE },
332
    { 0 }
333
};
334

    
335
static EbmlSyntax matroska_chapter_display[] = {
336
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
337
    { EBML_ID_VOID,                   EBML_NONE },
338
    { 0 }
339
};
340

    
341
static EbmlSyntax matroska_chapter_entry[] = {
342
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
343
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
344
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
345
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
346
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
347
    { EBML_ID_VOID,                   EBML_NONE },
348
    { 0 }
349
};
350

    
351
static EbmlSyntax matroska_chapter[] = {
352
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
353
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
354
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
355
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
356
    { EBML_ID_VOID,                   EBML_NONE },
357
    { 0 }
358
};
359

    
360
static EbmlSyntax matroska_chapters[] = {
361
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
362
    { EBML_ID_VOID,                   EBML_NONE },
363
    { 0 }
364
};
365

    
366
static EbmlSyntax matroska_index_pos[] = {
367
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
368
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
369
    { EBML_ID_VOID,                   EBML_NONE },
370
    { 0 }
371
};
372

    
373
static EbmlSyntax matroska_index_entry[] = {
374
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
375
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
376
    { EBML_ID_VOID,                   EBML_NONE },
377
    { 0 }
378
};
379

    
380
static EbmlSyntax matroska_index[] = {
381
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
382
    { EBML_ID_VOID,                   EBML_NONE },
383
    { 0 }
384
};
385

    
386
static EbmlSyntax matroska_tags[] = {
387
    { EBML_ID_VOID,                   EBML_NONE },
388
    { 0 }
389
};
390

    
391
/*
392
 * The first few functions handle EBML file parsing. The rest
393
 * is the document interpretation. Matroska really just is a
394
 * EBML file.
395
 */
396

    
397
/*
398
 * Return: the amount of levels in the hierarchy that the
399
 * current element lies higher than the previous one.
400
 * The opposite isn't done - that's auto-done using master
401
 * element reading.
402
 */
403

    
404
static int
405
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
406
{
407
    ByteIOContext *pb = matroska->ctx->pb;
408
    offset_t pos = url_ftell(pb);
409
    int num = 0;
410

    
411
    while (matroska->num_levels > 0) {
412
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
413

    
414
        if (pos >= level->start + level->length) {
415
            matroska->num_levels--;
416
            num++;
417
        } else {
418
            break;
419
        }
420
    }
421

    
422
    return num;
423
}
424

    
425
/*
426
 * Read: an "EBML number", which is defined as a variable-length
427
 * array of bytes. The first byte indicates the length by giving a
428
 * number of 0-bits followed by a one. The position of the first
429
 * "one" bit inside the first byte indicates the length of this
430
 * number.
431
 * Returns: num. of bytes read. < 0 on error.
432
 */
433

    
434
static int
435
ebml_read_num (MatroskaDemuxContext *matroska,
436
               int                   max_size,
437
               uint64_t             *number)
438
{
439
    ByteIOContext *pb = matroska->ctx->pb;
440
    int len_mask = 0x80, read = 1, n = 1;
441
    int64_t total = 0;
442

    
443
    /* the first byte tells us the length in bytes - get_byte() can normally
444
     * return 0, but since that's not a valid first ebmlID byte, we can
445
     * use it safely here to catch EOS. */
446
    if (!(total = get_byte(pb))) {
447
        /* we might encounter EOS here */
448
        if (!url_feof(pb)) {
449
            offset_t pos = url_ftell(pb);
450
            av_log(matroska->ctx, AV_LOG_ERROR,
451
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
452
                   pos, pos);
453
        }
454
        return AVERROR(EIO); /* EOS or actual I/O error */
455
    }
456

    
457
    /* get the length of the EBML number */
458
    while (read <= max_size && !(total & len_mask)) {
459
        read++;
460
        len_mask >>= 1;
461
    }
462
    if (read > max_size) {
463
        offset_t pos = url_ftell(pb) - 1;
464
        av_log(matroska->ctx, AV_LOG_ERROR,
465
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
466
               (uint8_t) total, pos, pos);
467
        return AVERROR_INVALIDDATA;
468
    }
469

    
470
    /* read out length */
471
    total &= ~len_mask;
472
    while (n++ < read)
473
        total = (total << 8) | get_byte(pb);
474

    
475
    *number = total;
476

    
477
    return read;
478
}
479

    
480
/*
481
 * Read: the element content data ID.
482
 * Return: the number of bytes read or < 0 on error.
483
 */
484

    
485
static int
486
ebml_read_element_id (MatroskaDemuxContext *matroska,
487
                      uint32_t             *id,
488
                      int                  *level_up)
489
{
490
    int read;
491
    uint64_t total;
492

    
493
    /* if we re-call this, use our cached ID */
494
    if (matroska->peek_id != 0) {
495
        if (level_up)
496
            *level_up = 0;
497
        *id = matroska->peek_id;
498
        return 0;
499
    }
500

    
501
    /* read out the "EBML number", include tag in ID */
502
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
503
        return read;
504
    *id = matroska->peek_id  = total | (1 << (read * 7));
505

    
506
    /* level tracking */
507
    if (level_up)
508
        *level_up = ebml_read_element_level_up(matroska);
509

    
510
    return read;
511
}
512

    
513
/*
514
 * Read: element content length.
515
 * Return: the number of bytes read or < 0 on error.
516
 */
517

    
518
static int
519
ebml_read_element_length (MatroskaDemuxContext *matroska,
520
                          uint64_t             *length)
521
{
522
    /* clear cache since we're now beyond that data point */
523
    matroska->peek_id = 0;
524

    
525
    /* read out the "EBML number", include tag in ID */
526
    return ebml_read_num(matroska, 8, length);
527
}
528

    
529
/*
530
 * Return: the ID of the next element, or 0 on error.
531
 * Level_up contains the amount of levels that this
532
 * next element lies higher than the previous one.
533
 */
534

    
535
static uint32_t
536
ebml_peek_id (MatroskaDemuxContext *matroska,
537
              int                  *level_up)
538
{
539
    uint32_t id;
540

    
541
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
542
        return 0;
543

    
544
    return id;
545
}
546

    
547
/*
548
 * Seek to a given offset.
549
 * 0 is success, -1 is failure.
550
 */
551

    
552
static int
553
ebml_read_seek (MatroskaDemuxContext *matroska,
554
                offset_t              offset)
555
{
556
    ByteIOContext *pb = matroska->ctx->pb;
557

    
558
    /* clear ID cache, if any */
559
    matroska->peek_id = 0;
560

    
561
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
562
}
563

    
564
/*
565
 * Skip the next element.
566
 * 0 is success, -1 is failure.
567
 */
568

    
569
static int
570
ebml_read_skip (MatroskaDemuxContext *matroska)
571
{
572
    ByteIOContext *pb = matroska->ctx->pb;
573
    uint32_t id;
574
    uint64_t length;
575
    int res;
576

    
577
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
578
        (res = ebml_read_element_length(matroska, &length)) < 0)
579
        return res;
580

    
581
    url_fskip(pb, length);
582

    
583
    return 0;
584
}
585

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

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

    
600
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
601
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
602
        return res;
603
    size = rlength;
604
    if (size < 1 || size > 8) {
605
        offset_t pos = url_ftell(pb);
606
        av_log(matroska->ctx, AV_LOG_ERROR,
607
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
608
                size, pos, pos);
609
        return AVERROR_INVALIDDATA;
610
    }
611

    
612
    /* big-endian ordening; build up number */
613
    *num = 0;
614
    while (n++ < size)
615
        *num = (*num << 8) | get_byte(pb);
616

    
617
    return 0;
618
}
619

    
620
/*
621
 * Read the next element as a signed int.
622
 * 0 is success, < 0 is failure.
623
 */
624

    
625
static int
626
ebml_read_sint (MatroskaDemuxContext *matroska,
627
                uint32_t             *id,
628
                int64_t              *num)
629
{
630
    ByteIOContext *pb = matroska->ctx->pb;
631
    int size, n = 1, negative = 0, res;
632
    uint64_t rlength;
633

    
634
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
635
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
636
        return res;
637
    size = rlength;
638
    if (size < 1 || size > 8) {
639
        offset_t pos = url_ftell(pb);
640
        av_log(matroska->ctx, AV_LOG_ERROR,
641
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
642
                size, pos, pos);
643
        return AVERROR_INVALIDDATA;
644
    }
645
    if ((*num = get_byte(pb)) & 0x80) {
646
        negative = 1;
647
        *num &= ~0x80;
648
    }
649
    while (n++ < size)
650
        *num = (*num << 8) | get_byte(pb);
651

    
652
    /* make signed */
653
    if (negative)
654
        *num = *num - (1LL << ((8 * size) - 1));
655

    
656
    return 0;
657
}
658

    
659
/*
660
 * Read the next element as a float.
661
 * 0 is success, < 0 is failure.
662
 */
663

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

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

    
678
    if (size == 4) {
679
        *num= av_int2flt(get_be32(pb));
680
    } else if(size==8){
681
        *num= av_int2dbl(get_be64(pb));
682
    } else{
683
        offset_t pos = url_ftell(pb);
684
        av_log(matroska->ctx, AV_LOG_ERROR,
685
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
686
               size, pos, pos);
687
        return AVERROR_INVALIDDATA;
688
    }
689

    
690
    return 0;
691
}
692

    
693
/*
694
 * Read the next element as an ASCII string.
695
 * 0 is success, < 0 is failure.
696
 */
697

    
698
static int
699
ebml_read_ascii (MatroskaDemuxContext *matroska,
700
                 uint32_t             *id,
701
                 char                **str)
702
{
703
    ByteIOContext *pb = matroska->ctx->pb;
704
    int size, res;
705
    uint64_t rlength;
706

    
707
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
708
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
709
        return res;
710
    size = rlength;
711

    
712
    /* ebml strings are usually not 0-terminated, so we allocate one
713
     * byte more, read the string and NULL-terminate it ourselves. */
714
    if (size < 0 || !(*str = av_malloc(size + 1))) {
715
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
716
        return AVERROR(ENOMEM);
717
    }
718
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
719
        offset_t pos = url_ftell(pb);
720
        av_log(matroska->ctx, AV_LOG_ERROR,
721
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
722
        av_free(*str);
723
        return AVERROR(EIO);
724
    }
725
    (*str)[size] = '\0';
726

    
727
    return 0;
728
}
729

    
730
/*
731
 * Read the next element as a UTF-8 string.
732
 * 0 is success, < 0 is failure.
733
 */
734

    
735
static int
736
ebml_read_utf8 (MatroskaDemuxContext *matroska,
737
                uint32_t             *id,
738
                char                **str)
739
{
740
  return ebml_read_ascii(matroska, id, str);
741
}
742

    
743
/*
744
 * Read the next element, but only the header. The contents
745
 * are supposed to be sub-elements which can be read separately.
746
 * 0 is success, < 0 is failure.
747
 */
748

    
749
static int
750
ebml_read_master (MatroskaDemuxContext *matroska,
751
                  uint32_t             *id)
752
{
753
    ByteIOContext *pb = matroska->ctx->pb;
754
    uint64_t length;
755
    MatroskaLevel *level;
756
    int res;
757

    
758
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
759
        (res = ebml_read_element_length(matroska, &length)) < 0)
760
        return res;
761

    
762
    /* protect... (Heaven forbids that the '>' is true) */
763
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
764
        av_log(matroska->ctx, AV_LOG_ERROR,
765
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
766
        return AVERROR(ENOSYS);
767
    }
768

    
769
    /* remember level */
770
    level = &matroska->levels[matroska->num_levels++];
771
    level->start = url_ftell(pb);
772
    level->length = length;
773

    
774
    return 0;
775
}
776

    
777
/*
778
 * Read the next element as binary data.
779
 * 0 is success, < 0 is failure.
780
 */
781

    
782
static int
783
ebml_read_binary (MatroskaDemuxContext *matroska,
784
                  uint32_t             *id,
785
                  uint8_t             **binary,
786
                  int                  *size)
787
{
788
    ByteIOContext *pb = matroska->ctx->pb;
789
    uint64_t rlength;
790
    int res;
791

    
792
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
793
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
794
        return res;
795
    *size = rlength;
796

    
797
    if (!(*binary = av_malloc(*size))) {
798
        av_log(matroska->ctx, AV_LOG_ERROR,
799
               "Memory allocation error\n");
800
        return AVERROR(ENOMEM);
801
    }
802

    
803
    if (get_buffer(pb, *binary, *size) != *size) {
804
        offset_t pos = url_ftell(pb);
805
        av_log(matroska->ctx, AV_LOG_ERROR,
806
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
807
        return AVERROR(EIO);
808
    }
809

    
810
    return 0;
811
}
812

    
813
/*
814
 * Read signed/unsigned "EBML" numbers.
815
 * Return: number of bytes processed, < 0 on error.
816
 * XXX: use ebml_read_num().
817
 */
818

    
819
static int
820
matroska_ebmlnum_uint (uint8_t  *data,
821
                       uint32_t  size,
822
                       uint64_t *num)
823
{
824
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
825
    uint64_t total;
826

    
827
    if (size <= 0)
828
        return AVERROR_INVALIDDATA;
829

    
830
    total = data[0];
831
    while (read <= 8 && !(total & len_mask)) {
832
        read++;
833
        len_mask >>= 1;
834
    }
835
    if (read > 8)
836
        return AVERROR_INVALIDDATA;
837

    
838
    if ((total &= (len_mask - 1)) == len_mask - 1)
839
        num_ffs++;
840
    if (size < read)
841
        return AVERROR_INVALIDDATA;
842
    while (n < read) {
843
        if (data[n] == 0xff)
844
            num_ffs++;
845
        total = (total << 8) | data[n];
846
        n++;
847
    }
848

    
849
    if (read == num_ffs)
850
        *num = (uint64_t)-1;
851
    else
852
        *num = total;
853

    
854
    return read;
855
}
856

    
857
/*
858
 * Same as above, but signed.
859
 */
860

    
861
static int
862
matroska_ebmlnum_sint (uint8_t  *data,
863
                       uint32_t  size,
864
                       int64_t  *num)
865
{
866
    uint64_t unum;
867
    int res;
868

    
869
    /* read as unsigned number first */
870
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
871
        return res;
872

    
873
    /* make signed (weird way) */
874
    if (unum == (uint64_t)-1)
875
        *num = INT64_MAX;
876
    else
877
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
878

    
879
    return res;
880
}
881

    
882

    
883
static MatroskaTrack *
884
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
885
                            int                   num)
886
{
887
    MatroskaTrack *tracks = matroska->tracks.elem;
888
    int i;
889

    
890
    for (i=0; i < matroska->tracks.nb_elem; i++)
891
        if (tracks[i].num == num)
892
            return &tracks[i];
893

    
894
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
895
    return NULL;
896
}
897

    
898

    
899
/*
900
 * Put one packet in an application-supplied AVPacket struct.
901
 * Returns 0 on success or -1 on failure.
902
 */
903

    
904
static int
905
matroska_deliver_packet (MatroskaDemuxContext *matroska,
906
                         AVPacket             *pkt)
907
{
908
    if (matroska->num_packets > 0) {
909
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
910
        av_free(matroska->packets[0]);
911
        if (matroska->num_packets > 1) {
912
            memmove(&matroska->packets[0], &matroska->packets[1],
913
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
914
            matroska->packets =
915
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
916
                           sizeof(AVPacket *));
917
        } else {
918
            av_freep(&matroska->packets);
919
        }
920
        matroska->num_packets--;
921
        return 0;
922
    }
923

    
924
    return -1;
925
}
926

    
927
/*
928
 * Put a packet into our internal queue. Will be delivered to the
929
 * user/application during the next get_packet() call.
930
 */
931

    
932
static void
933
matroska_queue_packet (MatroskaDemuxContext *matroska,
934
                       AVPacket             *pkt)
935
{
936
    matroska->packets =
937
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
938
                   sizeof(AVPacket *));
939
    matroska->packets[matroska->num_packets] = pkt;
940
    matroska->num_packets++;
941
}
942

    
943
/*
944
 * Free all packets in our internal queue.
945
 */
946
static void
947
matroska_clear_queue (MatroskaDemuxContext *matroska)
948
{
949
    if (matroska->packets) {
950
        int n;
951
        for (n = 0; n < matroska->num_packets; n++) {
952
            av_free_packet(matroska->packets[n]);
953
            av_free(matroska->packets[n]);
954
        }
955
        av_free(matroska->packets);
956
        matroska->packets = NULL;
957
        matroska->num_packets = 0;
958
    }
959
}
960

    
961

    
962
/*
963
 * Autodetecting...
964
 */
965

    
966
static int
967
matroska_probe (AVProbeData *p)
968
{
969
    uint64_t total = 0;
970
    int len_mask = 0x80, size = 1, n = 1;
971
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
972

    
973
    /* ebml header? */
974
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
975
        return 0;
976

    
977
    /* length of header */
978
    total = p->buf[4];
979
    while (size <= 8 && !(total & len_mask)) {
980
        size++;
981
        len_mask >>= 1;
982
    }
983
    if (size > 8)
984
      return 0;
985
    total &= (len_mask - 1);
986
    while (n < size)
987
        total = (total << 8) | p->buf[4 + n++];
988

    
989
    /* does the probe data contain the whole header? */
990
    if (p->buf_size < 4 + size + total)
991
      return 0;
992

    
993
    /* the header must contain the document type 'matroska'. For now,
994
     * we don't parse the whole header but simply check for the
995
     * availability of that array of characters inside the header.
996
     * Not fully fool-proof, but good enough. */
997
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
998
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
999
            return AVPROBE_SCORE_MAX;
1000

    
1001
    return 0;
1002
}
1003

    
1004
/*
1005
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1006
 */
1007

    
1008
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1009
                      void *data, uint32_t expected_id, int once);
1010

    
1011
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
1012
                           EbmlSyntax *syntax, void *data)
1013
{
1014
    uint32_t id = syntax->id;
1015
    EbmlBin *bin;
1016
    int res;
1017

    
1018
    data = (char *)data + syntax->data_offset;
1019
    if (syntax->list_elem_size) {
1020
        EbmlList *list = data;
1021
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
1022
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
1023
        memset(data, 0, syntax->list_elem_size);
1024
        list->nb_elem++;
1025
    }
1026
    bin = data;
1027

    
1028
    switch (syntax->type) {
1029
    case EBML_UINT:  return ebml_read_uint (matroska, &id, data);
1030
    case EBML_FLOAT: return ebml_read_float(matroska, &id, data);
1031
    case EBML_STR:
1032
    case EBML_UTF8:  av_free(*(char **)data);
1033
                     return ebml_read_ascii(matroska, &id, data);
1034
    case EBML_BIN:   av_free(bin->data);
1035
                     bin->pos = url_ftell(matroska->ctx->pb);
1036
                     return ebml_read_binary(matroska, &id, &bin->data,
1037
                                                            &bin->size);
1038
    case EBML_NEST:  if ((res=ebml_read_master(matroska, &id)) < 0)
1039
                         return res;
1040
                     if (id == MATROSKA_ID_SEGMENT)
1041
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
1042
                     return ebml_parse(matroska, syntax->def.n, data, 0, 0);
1043
    case EBML_PASS:  return ebml_parse(matroska, syntax->def.n, data, 0, 1);
1044
    case EBML_STOP:  *(int *)data = 1;      return 1;
1045
    default:         return ebml_read_skip(matroska);
1046
    }
1047
}
1048

    
1049
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1050
                         uint32_t id, void *data)
1051
{
1052
    int i;
1053
    for (i=0; syntax[i].id; i++)
1054
        if (id == syntax[i].id)
1055
            break;
1056
    if (!syntax[i].id)
1057
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
1058
    return ebml_parse_elem(matroska, &syntax[i], data);
1059
}
1060

    
1061
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1062
                      void *data, uint32_t expected_id, int once)
1063
{
1064
    int i, res = 0;
1065
    uint32_t id = 0;
1066

    
1067
    for (i=0; syntax[i].id; i++)
1068
        switch (syntax[i].type) {
1069
        case EBML_UINT:
1070
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
1071
            break;
1072
        case EBML_FLOAT:
1073
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
1074
            break;
1075
        case EBML_STR:
1076
        case EBML_UTF8:
1077
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
1078
            break;
1079
        }
1080

    
1081
    if (expected_id) {
1082
        res = ebml_read_master(matroska, &id);
1083
        if (id != expected_id)
1084
            return AVERROR_INVALIDDATA;
1085
        if (id == MATROSKA_ID_SEGMENT)
1086
            matroska->segment_start = url_ftell(matroska->ctx->pb);
1087
    }
1088

    
1089
    while (!res) {
1090
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1091
            res = AVERROR(EIO);
1092
            break;
1093
        } else if (matroska->level_up) {
1094
            matroska->level_up--;
1095
            break;
1096
        }
1097

    
1098
        res = ebml_parse_id(matroska, syntax, id, data);
1099
        if (once)
1100
            break;
1101

    
1102

    
1103
        if (matroska->level_up) {
1104
            matroska->level_up--;
1105
            break;
1106
        }
1107
    }
1108

    
1109
    return res;
1110
}
1111

    
1112
static void ebml_free(EbmlSyntax *syntax, void *data)
1113
{
1114
    int i, j;
1115
    for (i=0; syntax[i].id; i++) {
1116
        void *data_off = (char *)data + syntax[i].data_offset;
1117
        switch (syntax[i].type) {
1118
        case EBML_STR:
1119
        case EBML_UTF8:  av_freep(data_off);                      break;
1120
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
1121
        case EBML_NEST:
1122
            if (syntax[i].list_elem_size) {
1123
                EbmlList *list = data_off;
1124
                char *ptr = list->elem;
1125
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
1126
                    ebml_free(syntax[i].def.n, ptr);
1127
                av_free(list->elem);
1128
            } else
1129
                ebml_free(syntax[i].def.n, data_off);
1130
        default:  break;
1131
        }
1132
    }
1133
}
1134

    
1135
static int
1136
matroska_parse_info (MatroskaDemuxContext *matroska)
1137
{
1138
    int res = ebml_parse(matroska, matroska_info, matroska, MATROSKA_ID_INFO, 0);
1139

    
1140
    if (matroska->duration)
1141
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1142
                                  * 1000 / AV_TIME_BASE;
1143
    if (matroska->title)
1144
        strncpy(matroska->ctx->title, matroska->title,
1145
                sizeof(matroska->ctx->title)-1);
1146

    
1147
    return res;
1148
}
1149

    
1150
static int
1151
matroska_decode_buffer(uint8_t** buf, int* buf_size, MatroskaTrack *track)
1152
{
1153
    MatroskaTrackEncoding *encodings = track->encodings.elem;
1154
    uint8_t* data = *buf;
1155
    int isize = *buf_size;
1156
    uint8_t* pkt_data = NULL;
1157
    int pkt_size = isize;
1158
    int result = 0;
1159
    int olen;
1160

    
1161
    switch (encodings[0].compression.algo) {
1162
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1163
        return encodings[0].compression.settings.size;
1164
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
1165
        do {
1166
            olen = pkt_size *= 3;
1167
            pkt_data = av_realloc(pkt_data,
1168
                                  pkt_size+LZO_OUTPUT_PADDING);
1169
            result = lzo1x_decode(pkt_data, &olen, data, &isize);
1170
        } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
1171
        if (result)
1172
            goto failed;
1173
        pkt_size -= olen;
1174
        break;
1175
#ifdef CONFIG_ZLIB
1176
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
1177
        z_stream zstream = {0};
1178
        if (inflateInit(&zstream) != Z_OK)
1179
            return -1;
1180
        zstream.next_in = data;
1181
        zstream.avail_in = isize;
1182
        do {
1183
            pkt_size *= 3;
1184
            pkt_data = av_realloc(pkt_data, pkt_size);
1185
            zstream.avail_out = pkt_size - zstream.total_out;
1186
            zstream.next_out = pkt_data + zstream.total_out;
1187
            result = inflate(&zstream, Z_NO_FLUSH);
1188
        } while (result==Z_OK && pkt_size<10000000);
1189
        pkt_size = zstream.total_out;
1190
        inflateEnd(&zstream);
1191
        if (result != Z_STREAM_END)
1192
            goto failed;
1193
        break;
1194
    }
1195
#endif
1196
#ifdef CONFIG_BZLIB
1197
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
1198
        bz_stream bzstream = {0};
1199
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1200
            return -1;
1201
        bzstream.next_in = data;
1202
        bzstream.avail_in = isize;
1203
        do {
1204
            pkt_size *= 3;
1205
            pkt_data = av_realloc(pkt_data, pkt_size);
1206
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1207
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1208
            result = BZ2_bzDecompress(&bzstream);
1209
        } while (result==BZ_OK && pkt_size<10000000);
1210
        pkt_size = bzstream.total_out_lo32;
1211
        BZ2_bzDecompressEnd(&bzstream);
1212
        if (result != BZ_STREAM_END)
1213
            goto failed;
1214
        break;
1215
    }
1216
#endif
1217
    }
1218

    
1219
    *buf = pkt_data;
1220
    *buf_size = pkt_size;
1221
    return 0;
1222
 failed:
1223
    av_free(pkt_data);
1224
    return -1;
1225
}
1226

    
1227
static int
1228
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1229
{
1230
    MatroskaTrack *tracks;
1231
    int i, res;
1232

    
1233
    res = ebml_parse(matroska, matroska_tracks, matroska, MATROSKA_ID_TRACKS, 0);
1234

    
1235
    tracks = matroska->tracks.elem;
1236
    for (i=0; i<matroska->tracks.nb_elem; i++) {
1237
        MatroskaTrack *track = &tracks[i];
1238
        EbmlList *encodings_list = &tracks->encodings;
1239
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1240

    
1241
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1242
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1243
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1244
            av_log(matroska->ctx, AV_LOG_INFO,
1245
                   "Unknown or unsupported track type %"PRIu64"\n",
1246
                   track->type);
1247
            continue;
1248
        }
1249

    
1250
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1251
            if (!track->default_duration)
1252
                track->default_duration = 1000000000/track->video.frame_rate;
1253
            if (!track->video.display_width)
1254
                track->video.display_width = track->video.pixel_width;
1255
            if (!track->video.display_height)
1256
                track->video.display_height = track->video.pixel_height;
1257
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1258
            if (!track->audio.out_samplerate)
1259
                track->audio.out_samplerate = track->audio.samplerate;
1260
        }
1261
        if (encodings_list->nb_elem > 1) {
1262
            av_log(matroska->ctx, AV_LOG_ERROR,
1263
                   "Multiple combined encodings no supported");
1264
        } else if (encodings_list->nb_elem == 1) {
1265
            if (encodings[0].type ||
1266
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1267
#ifdef CONFIG_ZLIB
1268
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1269
#endif
1270
#ifdef CONFIG_BZLIB
1271
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1272
#endif
1273
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1274
                encodings[0].scope = 0;
1275
                av_log(matroska->ctx, AV_LOG_ERROR,
1276
                       "Unsupported encoding type");
1277
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1278
                uint8_t *codec_priv = track->codec_priv.data;
1279
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1280
                                                    &track->codec_priv.size,
1281
                                                    track);
1282
                if (offset < 0) {
1283
                    track->codec_priv.data = NULL;
1284
                    track->codec_priv.size = 0;
1285
                    av_log(matroska->ctx, AV_LOG_ERROR,
1286
                           "Failed to decode codec private data\n");
1287
                } else if (offset > 0) {
1288
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1289
                    memcpy(track->codec_priv.data,
1290
                           encodings[0].compression.settings.data, offset);
1291
                    memcpy(track->codec_priv.data+offset, codec_priv,
1292
                           track->codec_priv.size);
1293
                    track->codec_priv.size += offset;
1294
                }
1295
                if (codec_priv != track->codec_priv.data)
1296
                    av_free(codec_priv);
1297
            }
1298
        }
1299
    }
1300

    
1301
    return res;
1302
}
1303

    
1304
static int
1305
matroska_parse_index (MatroskaDemuxContext *matroska)
1306
{
1307
    return ebml_parse(matroska, matroska_index, matroska, MATROSKA_ID_CUES, 0);
1308
}
1309

    
1310
static int
1311
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1312
{
1313
    return ebml_parse(matroska, matroska_tags, matroska, MATROSKA_ID_TAGS, 0);
1314
}
1315

    
1316
static int
1317
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1318
{
1319
    int res = 0;
1320
    uint32_t id;
1321

    
1322
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1323

    
1324
    while (res == 0) {
1325
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1326
            res = AVERROR(EIO);
1327
            break;
1328
        } else if (matroska->level_up) {
1329
            matroska->level_up--;
1330
            break;
1331
        }
1332

    
1333
        switch (id) {
1334
            case MATROSKA_ID_SEEKENTRY: {
1335
                uint32_t seek_id = 0, peek_id_cache = 0;
1336
                uint64_t seek_pos = (uint64_t) -1, t;
1337
                int dummy_level = 0;
1338

    
1339
                if ((res = ebml_read_master(matroska, &id)) < 0)
1340
                    break;
1341

    
1342
                while (res == 0) {
1343
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1344
                        res = AVERROR(EIO);
1345
                        break;
1346
                    } else if (matroska->level_up) {
1347
                        matroska->level_up--;
1348
                        break;
1349
                    }
1350

    
1351
                    switch (id) {
1352
                        case MATROSKA_ID_SEEKID:
1353
                            res = ebml_read_uint(matroska, &id, &t);
1354
                            seek_id = t;
1355
                            break;
1356

    
1357
                        case MATROSKA_ID_SEEKPOSITION:
1358
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1359
                            break;
1360

    
1361
                        default:
1362
                            av_log(matroska->ctx, AV_LOG_INFO,
1363
                                   "Unknown seekhead ID 0x%x\n", id);
1364
                            /* fall-through */
1365

    
1366
                        case EBML_ID_VOID:
1367
                            res = ebml_read_skip(matroska);
1368
                            break;
1369
                    }
1370

    
1371
                    if (matroska->level_up) {
1372
                        matroska->level_up--;
1373
                        break;
1374
                    }
1375
                }
1376

    
1377
                if (!seek_id || seek_pos == (uint64_t) -1) {
1378
                    av_log(matroska->ctx, AV_LOG_INFO,
1379
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1380
                           seek_id, seek_pos);
1381
                    break;
1382
                }
1383

    
1384
                switch (seek_id) {
1385
                    case MATROSKA_ID_CUES:
1386
                    case MATROSKA_ID_TAGS: {
1387
                        uint32_t level_up = matroska->level_up;
1388
                        offset_t before_pos;
1389
                        MatroskaLevel level;
1390

    
1391
                        /* remember the peeked ID and the current position */
1392
                        peek_id_cache = matroska->peek_id;
1393
                        before_pos = url_ftell(matroska->ctx->pb);
1394

    
1395
                        /* seek */
1396
                        if ((res = ebml_read_seek(matroska, seek_pos +
1397
                                               matroska->segment_start)) < 0)
1398
                            goto finish;
1399

    
1400
                        /* we don't want to lose our seekhead level, so we add
1401
                         * a dummy. This is a crude hack. */
1402
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1403
                            av_log(matroska->ctx, AV_LOG_INFO,
1404
                                   "Max EBML element depth (%d) reached, "
1405
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1406
                            return AVERROR_UNKNOWN;
1407
                        }
1408

    
1409
                        level.start = 0;
1410
                        level.length = (uint64_t)-1;
1411
                        matroska->levels[matroska->num_levels] = level;
1412
                        matroska->num_levels++;
1413
                        dummy_level = 1;
1414

    
1415
                        /* check ID */
1416
                        if (!(id = ebml_peek_id (matroska,
1417
                                                 &matroska->level_up)))
1418
                            goto finish;
1419
                        if (id != seek_id) {
1420
                            av_log(matroska->ctx, AV_LOG_INFO,
1421
                                   "We looked for ID=0x%x but got "
1422
                                   "ID=0x%x (pos=%"PRIu64")",
1423
                                   seek_id, id, seek_pos +
1424
                                   matroska->segment_start);
1425
                            goto finish;
1426
                        }
1427

    
1428
                        /* read master + parse */
1429
                        switch (id) {
1430
                            case MATROSKA_ID_CUES:
1431
                                if (!(res = matroska_parse_index(matroska)) ||
1432
                                    url_feof(matroska->ctx->pb)) {
1433
                                    matroska->index_parsed = 1;
1434
                                    res = 0;
1435
                                }
1436
                                break;
1437
                            case MATROSKA_ID_TAGS:
1438
                                if (!(res = matroska_parse_metadata(matroska)) ||
1439
                                   url_feof(matroska->ctx->pb)) {
1440
                                    matroska->metadata_parsed = 1;
1441
                                    res = 0;
1442
                                }
1443
                                break;
1444
                        }
1445

    
1446
                    finish:
1447
                        /* remove dummy level */
1448
                        if (dummy_level)
1449
                            while (matroska->num_levels) {
1450
                                uint64_t length = matroska->levels[--matroska->num_levels].length;
1451
                                if (length == (uint64_t)-1)
1452
                                    break;
1453
                            }
1454

    
1455
                        /* seek back */
1456
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1457
                            return res;
1458
                        matroska->peek_id = peek_id_cache;
1459
                        matroska->level_up = level_up;
1460
                        break;
1461
                    }
1462

    
1463
                    default:
1464
                        av_log(matroska->ctx, AV_LOG_INFO,
1465
                               "Ignoring seekhead entry for ID=0x%x\n",
1466
                               seek_id);
1467
                        break;
1468
                }
1469

    
1470
                break;
1471
            }
1472

    
1473
            default:
1474
                av_log(matroska->ctx, AV_LOG_INFO,
1475
                       "Unknown seekhead ID 0x%x\n", id);
1476
                /* fall-through */
1477

    
1478
            case EBML_ID_VOID:
1479
                res = ebml_read_skip(matroska);
1480
                break;
1481
        }
1482

    
1483
        if (matroska->level_up) {
1484
            matroska->level_up--;
1485
            break;
1486
        }
1487
    }
1488

    
1489
    return res;
1490
}
1491

    
1492
static int
1493
matroska_parse_attachments(AVFormatContext *s)
1494
{
1495
    MatroskaDemuxContext *matroska = s->priv_data;
1496
    EbmlList *attachements_list = &matroska->attachments;
1497
    MatroskaAttachement *attachements;
1498
    int i, j, res;
1499

    
1500
    res = ebml_parse(matroska, matroska_attachments, matroska, MATROSKA_ID_ATTACHMENTS, 0);
1501

    
1502
    attachements = attachements_list->elem;
1503
    for (j=0; j<attachements_list->nb_elem; j++) {
1504
        if (!(attachements[j].filename && attachements[j].mime &&
1505
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1506
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1507
        } else {
1508
            AVStream *st = av_new_stream(s, matroska->num_streams++);
1509
            if (st == NULL)
1510
                break;
1511
            st->filename          = av_strdup(attachements[j].filename);
1512
            st->codec->codec_id = CODEC_ID_NONE;
1513
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1514
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1515
            if(st->codec->extradata == NULL)
1516
                break;
1517
            st->codec->extradata_size = attachements[j].bin.size;
1518
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1519

    
1520
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1521
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1522
                             strlen(ff_mkv_mime_tags[i].str))) {
1523
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1524
                    break;
1525
                }
1526
            }
1527
        }
1528
    }
1529

    
1530
    return res;
1531
}
1532

    
1533
static int
1534
matroska_parse_chapters(AVFormatContext *s)
1535
{
1536
    MatroskaDemuxContext *matroska = s->priv_data;
1537
    EbmlList *chapters_list = &matroska->chapters;
1538
    MatroskaChapter *chapters;
1539
    int i, res;
1540

    
1541
    res = ebml_parse(matroska, matroska_chapters, matroska, MATROSKA_ID_CHAPTERS, 0);
1542

    
1543
    chapters = chapters_list->elem;
1544
    for (i=0; i<chapters_list->nb_elem; i++)
1545
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1546
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1547
                           chapters[i].start, chapters[i].end,
1548
                           chapters[i].title);
1549

    
1550
    return res;
1551
}
1552

    
1553
static int
1554
matroska_aac_profile (char *codec_id)
1555
{
1556
    static const char *aac_profiles[] = {
1557
        "MAIN", "LC", "SSR"
1558
    };
1559
    int profile;
1560

    
1561
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
1562
        if (strstr(codec_id, aac_profiles[profile]))
1563
            break;
1564
    return profile + 1;
1565
}
1566

    
1567
static int
1568
matroska_aac_sri (int samplerate)
1569
{
1570
    int sri;
1571

    
1572
    for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
1573
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1574
            break;
1575
    return sri;
1576
}
1577

    
1578
static int
1579
matroska_read_header (AVFormatContext    *s,
1580
                      AVFormatParameters *ap)
1581
{
1582
    MatroskaDemuxContext *matroska = s->priv_data;
1583
    EbmlList *index_list;
1584
    MatroskaIndex *index;
1585
    int i, j, last_level, res = 0;
1586
    Ebml ebml = { 0 };
1587
    uint32_t id;
1588

    
1589
    matroska->ctx = s;
1590

    
1591
    /* First read the EBML header. */
1592
    if (ebml_parse(matroska, ebml_syntax, &ebml, 0, 1)
1593
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1594
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1595
        || ebml.doctype_version > 2) {
1596
        av_log(matroska->ctx, AV_LOG_ERROR,
1597
               "EBML header using unsupported features\n"
1598
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1599
               ebml.version, ebml.doctype, ebml.doctype_version);
1600
        return AVERROR_NOFMT;
1601
    }
1602
    ebml_free(ebml_syntax, &ebml);
1603

    
1604
    /* The next thing is a segment. */
1605
    while (1) {
1606
        if (!(id = ebml_peek_id(matroska, &last_level)))
1607
            return AVERROR(EIO);
1608
        if (id == MATROSKA_ID_SEGMENT)
1609
            break;
1610

    
1611
        /* oi! */
1612
        av_log(matroska->ctx, AV_LOG_INFO,
1613
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
1614
               MATROSKA_ID_SEGMENT, id);
1615
        if ((res = ebml_read_skip(matroska)) < 0)
1616
            return res;
1617
    }
1618

    
1619
    /* We now have a Matroska segment.
1620
     * Seeks are from the beginning of the segment,
1621
     * after the segment ID/length. */
1622
    if ((res = ebml_read_master(matroska, &id)) < 0)
1623
        return res;
1624
    matroska->segment_start = url_ftell(s->pb);
1625

    
1626
    matroska->time_scale = 1000000;
1627
    /* we've found our segment, start reading the different contents in here */
1628
    while (res == 0) {
1629
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1630
            res = AVERROR(EIO);
1631
            break;
1632
        } else if (matroska->level_up) {
1633
            matroska->level_up--;
1634
            break;
1635
        }
1636

    
1637
        switch (id) {
1638
            /* stream info */
1639
            case MATROSKA_ID_INFO: {
1640
                res = matroska_parse_info(matroska);
1641
                break;
1642
            }
1643

    
1644
            /* track info headers */
1645
            case MATROSKA_ID_TRACKS: {
1646
                res = matroska_parse_tracks(matroska);
1647
                break;
1648
            }
1649

    
1650
            /* stream index */
1651
            case MATROSKA_ID_CUES: {
1652
                if (!matroska->index_parsed) {
1653
                    res = matroska_parse_index(matroska);
1654
                } else
1655
                    res = ebml_read_skip(matroska);
1656
                break;
1657
            }
1658

    
1659
            /* metadata */
1660
            case MATROSKA_ID_TAGS: {
1661
                if (!matroska->metadata_parsed) {
1662
                    res = matroska_parse_metadata(matroska);
1663
                } else
1664
                    res = ebml_read_skip(matroska);
1665
                break;
1666
            }
1667

    
1668
            /* file index (if seekable, seek to Cues/Tags to parse it) */
1669
            case MATROSKA_ID_SEEKHEAD: {
1670
                if ((res = ebml_read_master(matroska, &id)) < 0)
1671
                    break;
1672
                res = matroska_parse_seekhead(matroska);
1673
                break;
1674
            }
1675

    
1676
            case MATROSKA_ID_ATTACHMENTS: {
1677
                res = matroska_parse_attachments(s);
1678
                break;
1679
            }
1680

    
1681
            case MATROSKA_ID_CLUSTER: {
1682
                /* Do not read the master - this will be done in the next
1683
                 * call to matroska_read_packet. */
1684
                res = 1;
1685
                break;
1686
            }
1687

    
1688
            case MATROSKA_ID_CHAPTERS: {
1689
                res = matroska_parse_chapters(s);
1690
                break;
1691
            }
1692

    
1693
            default:
1694
                av_log(matroska->ctx, AV_LOG_INFO,
1695
                       "Unknown matroska file header ID 0x%x\n", id);
1696
            /* fall-through */
1697

    
1698
            case EBML_ID_VOID:
1699
                res = ebml_read_skip(matroska);
1700
                break;
1701
        }
1702

    
1703
        if (matroska->level_up) {
1704
            matroska->level_up--;
1705
            break;
1706
        }
1707
    }
1708

    
1709
    /* Have we found a cluster? */
1710
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
1711
        MatroskaTrack *tracks = matroska->tracks.elem;
1712
        int i, j;
1713
        AVStream *st;
1714

    
1715
        for (i=0; i < matroska->tracks.nb_elem; i++) {
1716
            MatroskaTrack *track = &tracks[i];
1717
            enum CodecID codec_id = CODEC_ID_NONE;
1718
            uint8_t *extradata = NULL;
1719
            int extradata_size = 0;
1720
            int extradata_offset = 0;
1721

    
1722
            /* Apply some sanity checks. */
1723
            if (track->codec_id == NULL)
1724
                continue;
1725

    
1726
            for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1727
                if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1728
                            strlen(ff_mkv_codec_tags[j].str))){
1729
                    codec_id= ff_mkv_codec_tags[j].id;
1730
                    break;
1731
                }
1732
            }
1733

    
1734
            st = track->stream = av_new_stream(s, matroska->num_streams++);
1735
            if (st == NULL)
1736
                return AVERROR(ENOMEM);
1737

    
1738
            /* Set the FourCC from the CodecID. */
1739
            /* This is the MS compatibility mode which stores a
1740
             * BITMAPINFOHEADER in the CodecPrivate. */
1741
            if (!strcmp(track->codec_id,
1742
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
1743
                (track->codec_priv.size >= 40) &&
1744
                (track->codec_priv.data != NULL)) {
1745
                /* Offset of biCompression. Stored in LE. */
1746
                track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1747
                codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1748

    
1749
            }
1750

    
1751
            /* This is the MS compatibility mode which stores a
1752
             * WAVEFORMATEX in the CodecPrivate. */
1753
            else if (!strcmp(track->codec_id,
1754
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
1755
                (track->codec_priv.size >= 18) &&
1756
                (track->codec_priv.data != NULL)) {
1757
                /* Offset of wFormatTag. Stored in LE. */
1758
                uint16_t tag = AV_RL16(track->codec_priv.data);
1759
                codec_id = codec_get_id(codec_wav_tags, tag);
1760

    
1761
            }
1762

    
1763
            if (!strcmp(track->codec_id, "V_QUICKTIME") &&
1764
                (track->codec_priv.size >= 86) &&
1765
                (track->codec_priv.data != NULL)) {
1766
                track->video.fourcc = AV_RL32(track->codec_priv.data);
1767
                codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1768
            }
1769

    
1770
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1771
                int profile = matroska_aac_profile(track->codec_id);
1772
                int sri = matroska_aac_sri(track->audio.samplerate);
1773
                extradata = av_malloc(5);
1774
                if (extradata == NULL)
1775
                    return AVERROR(ENOMEM);
1776
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1777
                extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1778
                if (strstr(track->codec_id, "SBR")) {
1779
                    sri = matroska_aac_sri(track->audio.out_samplerate);
1780
                    extradata[2] = 0x56;
1781
                    extradata[3] = 0xE5;
1782
                    extradata[4] = 0x80 | (sri<<3);
1783
                    extradata_size = 5;
1784
                } else {
1785
                    extradata_size = 2;
1786
                }
1787
            }
1788

    
1789
            else if (codec_id == CODEC_ID_TTA) {
1790
                ByteIOContext b;
1791
                extradata_size = 30;
1792
                extradata = av_mallocz(extradata_size);
1793
                if (extradata == NULL)
1794
                    return AVERROR(ENOMEM);
1795
                init_put_byte(&b, extradata, extradata_size, 1,
1796
                              NULL, NULL, NULL, NULL);
1797
                put_buffer(&b, "TTA1", 4);
1798
                put_le16(&b, 1);
1799
                put_le16(&b, track->audio.channels);
1800
                put_le16(&b, track->audio.bitdepth);
1801
                put_le32(&b, track->audio.out_samplerate);
1802
                put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1803
            }
1804

    
1805
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1806
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1807
                extradata_offset = 26;
1808
                track->codec_priv.size -= extradata_offset;
1809
            }
1810

    
1811
            else if (codec_id == CODEC_ID_RA_144) {
1812
                track->audio.out_samplerate = 8000;
1813
                track->audio.channels = 1;
1814
            }
1815

    
1816
            else if (codec_id == CODEC_ID_RA_288 ||
1817
                     codec_id == CODEC_ID_COOK ||
1818
                     codec_id == CODEC_ID_ATRAC3) {
1819
                ByteIOContext b;
1820

    
1821
                init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1822
                              0, NULL, NULL, NULL, NULL);
1823
                url_fskip(&b, 24);
1824
                track->audio.coded_framesize = get_be32(&b);
1825
                url_fskip(&b, 12);
1826
                track->audio.sub_packet_h    = get_be16(&b);
1827
                track->audio.frame_size      = get_be16(&b);
1828
                track->audio.sub_packet_size = get_be16(&b);
1829
                track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1830
                if (codec_id == CODEC_ID_RA_288) {
1831
                    st->codec->block_align = track->audio.coded_framesize;
1832
                    track->codec_priv.size = 0;
1833
                } else {
1834
                    st->codec->block_align = track->audio.sub_packet_size;
1835
                    extradata_offset = 78;
1836
                    track->codec_priv.size -= extradata_offset;
1837
                }
1838
            }
1839

    
1840
            if (codec_id == CODEC_ID_NONE) {
1841
                av_log(matroska->ctx, AV_LOG_INFO,
1842
                       "Unknown/unsupported CodecID %s.\n",
1843
                       track->codec_id);
1844
            }
1845

    
1846
            av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1847

    
1848
            st->codec->codec_id = codec_id;
1849
            st->start_time = 0;
1850
            if (strcmp(track->language, "und"))
1851
                av_strlcpy(st->language, track->language, 4);
1852

    
1853
            if (track->flag_default)
1854
                st->disposition |= AV_DISPOSITION_DEFAULT;
1855

    
1856
            if (track->default_duration)
1857
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1858
                          track->default_duration, 1000000000, 30000);
1859

    
1860
            if(extradata){
1861
                st->codec->extradata = extradata;
1862
                st->codec->extradata_size = extradata_size;
1863
            } else if(track->codec_priv.data && track->codec_priv.size > 0){
1864
                st->codec->extradata = av_malloc(track->codec_priv.size);
1865
                if(st->codec->extradata == NULL)
1866
                    return AVERROR(ENOMEM);
1867
                st->codec->extradata_size = track->codec_priv.size;
1868
                memcpy(st->codec->extradata,
1869
                       track->codec_priv.data + extradata_offset,
1870
                       track->codec_priv.size);
1871
            }
1872

    
1873
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1874
                st->codec->codec_type = CODEC_TYPE_VIDEO;
1875
                st->codec->codec_tag  = track->video.fourcc;
1876
                st->codec->width  = track->video.pixel_width;
1877
                st->codec->height = track->video.pixel_height;
1878
                av_reduce(&st->codec->sample_aspect_ratio.num,
1879
                          &st->codec->sample_aspect_ratio.den,
1880
                          st->codec->height * track->video.display_width,
1881
                          st->codec-> width * track->video.display_height,
1882
                          255);
1883
                st->need_parsing = AVSTREAM_PARSE_HEADERS;
1884
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1885
                st->codec->codec_type = CODEC_TYPE_AUDIO;
1886
                st->codec->sample_rate = track->audio.out_samplerate;
1887
                st->codec->channels = track->audio.channels;
1888
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1889
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1890
            }
1891

    
1892
            /* What do we do with private data? E.g. for Vorbis. */
1893
        }
1894
        res = 0;
1895
    }
1896

    
1897
    index_list = &matroska->index;
1898
    index = index_list->elem;
1899
    for (i=0; i<index_list->nb_elem; i++) {
1900
        EbmlList *pos_list = &index[i].pos;
1901
        MatroskaIndexPos *pos = pos_list->elem;
1902
        for (j=0; j<pos_list->nb_elem; j++) {
1903
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1904
                                                              pos[j].track);
1905
            if (track && track->stream)
1906
                av_add_index_entry(track->stream,
1907
                                   pos[j].pos + matroska->segment_start,
1908
                                   index[i].time*matroska->time_scale/AV_TIME_BASE,
1909
                                   0, 0, AVINDEX_KEYFRAME);
1910
        }
1911
    }
1912

    
1913
    return res;
1914
}
1915

    
1916
static int
1917
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
1918
                     int64_t pos, uint64_t cluster_time, uint64_t duration,
1919
                     int is_keyframe)
1920
{
1921
    MatroskaTrack *track;
1922
    int res = 0;
1923
    AVStream *st;
1924
    AVPacket *pkt;
1925
    uint8_t *origdata = data;
1926
    int16_t block_time;
1927
    uint32_t *lace_size = NULL;
1928
    int n, flags, laces = 0;
1929
    uint64_t num;
1930

    
1931
    /* first byte(s): tracknum */
1932
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
1933
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1934
        av_free(origdata);
1935
        return res;
1936
    }
1937
    data += n;
1938
    size -= n;
1939

    
1940
    /* fetch track from num */
1941
    track = matroska_find_track_by_num(matroska, num);
1942
    if (size <= 3 || !track || !track->stream) {
1943
        av_log(matroska->ctx, AV_LOG_INFO,
1944
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1945
        av_free(origdata);
1946
        return res;
1947
    }
1948
    st = track->stream;
1949
    if (st->discard >= AVDISCARD_ALL) {
1950
        av_free(origdata);
1951
        return res;
1952
    }
1953
    if (duration == AV_NOPTS_VALUE)
1954
        duration = track->default_duration / matroska->time_scale;
1955

    
1956
    /* block_time (relative to cluster time) */
1957
    block_time = AV_RB16(data);
1958
    data += 2;
1959
    flags = *data++;
1960
    size -= 3;
1961
    if (is_keyframe == -1)
1962
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1963

    
1964
    if (matroska->skip_to_keyframe) {
1965
        if (!is_keyframe || st != matroska->skip_to_stream) {
1966
            av_free(origdata);
1967
            return res;
1968
        }
1969
        matroska->skip_to_keyframe = 0;
1970
    }
1971

    
1972
    switch ((flags & 0x06) >> 1) {
1973
        case 0x0: /* no lacing */
1974
            laces = 1;
1975
            lace_size = av_mallocz(sizeof(int));
1976
            lace_size[0] = size;
1977
            break;
1978

    
1979
        case 0x1: /* xiph lacing */
1980
        case 0x2: /* fixed-size lacing */
1981
        case 0x3: /* EBML lacing */
1982
            assert(size>0); // size <=3 is checked before size-=3 above
1983
            laces = (*data) + 1;
1984
            data += 1;
1985
            size -= 1;
1986
            lace_size = av_mallocz(laces * sizeof(int));
1987

    
1988
            switch ((flags & 0x06) >> 1) {
1989
                case 0x1: /* xiph lacing */ {
1990
                    uint8_t temp;
1991
                    uint32_t total = 0;
1992
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1993
                        while (1) {
1994
                            if (size == 0) {
1995
                                res = -1;
1996
                                break;
1997
                            }
1998
                            temp = *data;
1999
                            lace_size[n] += temp;
2000
                            data += 1;
2001
                            size -= 1;
2002
                            if (temp != 0xff)
2003
                                break;
2004
                        }
2005
                        total += lace_size[n];
2006
                    }
2007
                    lace_size[n] = size - total;
2008
                    break;
2009
                }
2010

    
2011
                case 0x2: /* fixed-size lacing */
2012
                    for (n = 0; n < laces; n++)
2013
                        lace_size[n] = size / laces;
2014
                    break;
2015

    
2016
                case 0x3: /* EBML lacing */ {
2017
                    uint32_t total;
2018
                    n = matroska_ebmlnum_uint(data, size, &num);
2019
                    if (n < 0) {
2020
                        av_log(matroska->ctx, AV_LOG_INFO,
2021
                               "EBML block data error\n");
2022
                        break;
2023
                    }
2024
                    data += n;
2025
                    size -= n;
2026
                    total = lace_size[0] = num;
2027
                    for (n = 1; res == 0 && n < laces - 1; n++) {
2028
                        int64_t snum;
2029
                        int r;
2030
                        r = matroska_ebmlnum_sint (data, size, &snum);
2031
                        if (r < 0) {
2032
                            av_log(matroska->ctx, AV_LOG_INFO,
2033
                                   "EBML block data error\n");
2034
                            break;
2035
                        }
2036
                        data += r;
2037
                        size -= r;
2038
                        lace_size[n] = lace_size[n - 1] + snum;
2039
                        total += lace_size[n];
2040
                    }
2041
                    lace_size[n] = size - total;
2042
                    break;
2043
                }
2044
            }
2045
            break;
2046
    }
2047

    
2048
    if (res == 0) {
2049
        uint64_t timecode = AV_NOPTS_VALUE;
2050

    
2051
        if (cluster_time != (uint64_t)-1
2052
            && (block_time >= 0 || cluster_time >= -block_time))
2053
            timecode = cluster_time + block_time;
2054

    
2055
        for (n = 0; n < laces; n++) {
2056
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
2057
                st->codec->codec_id == CODEC_ID_COOK ||
2058
                st->codec->codec_id == CODEC_ID_ATRAC3) {
2059
                int a = st->codec->block_align;
2060
                int sps = track->audio.sub_packet_size;
2061
                int cfs = track->audio.coded_framesize;
2062
                int h = track->audio.sub_packet_h;
2063
                int y = track->audio.sub_packet_cnt;
2064
                int w = track->audio.frame_size;
2065
                int x;
2066

    
2067
                if (!track->audio.pkt_cnt) {
2068
                    if (st->codec->codec_id == CODEC_ID_RA_288)
2069
                        for (x=0; x<h/2; x++)
2070
                            memcpy(track->audio.buf+x*2*w+y*cfs,
2071
                                   data+x*cfs, cfs);
2072
                    else
2073
                        for (x=0; x<w/sps; x++)
2074
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
2075

    
2076
                    if (++track->audio.sub_packet_cnt >= h) {
2077
                        track->audio.sub_packet_cnt = 0;
2078
                        track->audio.pkt_cnt = h*w / a;
2079
                    }
2080
                }
2081
                while (track->audio.pkt_cnt) {
2082
                    pkt = av_mallocz(sizeof(AVPacket));
2083
                    av_new_packet(pkt, a);
2084
                    memcpy(pkt->data, track->audio.buf
2085
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
2086
                    pkt->pos = pos;
2087
                    pkt->stream_index = st->index;
2088
                    matroska_queue_packet(matroska, pkt);
2089
                }
2090
            } else {
2091
                MatroskaTrackEncoding *encodings = track->encodings.elem;
2092
                int offset = 0, pkt_size = lace_size[n];
2093
                uint8_t *pkt_data = data;
2094

    
2095
                if (encodings && encodings->scope & 1) {
2096
                    offset = matroska_decode_buffer(&pkt_data, &pkt_size,
2097
                                                    track);
2098
                    if (offset < 0)
2099
                        continue;
2100
                }
2101

    
2102
                pkt = av_mallocz(sizeof(AVPacket));
2103
                /* XXX: prevent data copy... */
2104
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
2105
                    av_free(pkt);
2106
                    res = AVERROR(ENOMEM);
2107
                    n = laces-1;
2108
                    break;
2109
                }
2110
                if (offset)
2111
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
2112
                memcpy (pkt->data+offset, pkt_data, pkt_size);
2113

    
2114
                if (pkt_data != data)
2115
                    av_free(pkt_data);
2116

    
2117
                if (n == 0)
2118
                    pkt->flags = is_keyframe;
2119
                pkt->stream_index = st->index;
2120

    
2121
                pkt->pts = timecode;
2122
                pkt->pos = pos;
2123
                pkt->duration = duration;
2124

    
2125
                matroska_queue_packet(matroska, pkt);
2126
            }
2127

    
2128
            if (timecode != AV_NOPTS_VALUE)
2129
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
2130
            data += lace_size[n];
2131
        }
2132
    }
2133

    
2134
    av_free(lace_size);
2135
    av_free(origdata);
2136
    return res;
2137
}
2138

    
2139
static int
2140
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2141
                           uint64_t              cluster_time)
2142
{
2143
    int res = 0;
2144
    uint32_t id;
2145
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2146
    uint64_t duration = AV_NOPTS_VALUE;
2147
    uint8_t *data;
2148
    int size = 0;
2149
    int64_t pos = 0;
2150

    
2151
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2152

    
2153
    while (res == 0) {
2154
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2155
            res = AVERROR(EIO);
2156
            break;
2157
        } else if (matroska->level_up) {
2158
            matroska->level_up--;
2159
            break;
2160
        }
2161

    
2162
        switch (id) {
2163
            /* one block inside the group. Note, block parsing is one
2164
             * of the harder things, so this code is a bit complicated.
2165
             * See http://www.matroska.org/ for documentation. */
2166
            case MATROSKA_ID_BLOCK: {
2167
                pos = url_ftell(matroska->ctx->pb);
2168
                res = ebml_read_binary(matroska, &id, &data, &size);
2169
                break;
2170
            }
2171

    
2172
            case MATROSKA_ID_BLOCKDURATION: {
2173
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2174
                    break;
2175
                break;
2176
            }
2177

    
2178
            case MATROSKA_ID_BLOCKREFERENCE: {
2179
                int64_t num;
2180
                /* We've found a reference, so not even the first frame in
2181
                 * the lace is a key frame. */
2182
                is_keyframe = 0;
2183
                if (last_num_packets != matroska->num_packets)
2184
                    matroska->packets[last_num_packets]->flags = 0;
2185
                if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
2186
                    break;
2187
                break;
2188
            }
2189

    
2190
            default:
2191
                av_log(matroska->ctx, AV_LOG_INFO,
2192
                       "Unknown entry 0x%x in blockgroup data\n", id);
2193
                /* fall-through */
2194

    
2195
            case EBML_ID_VOID:
2196
                res = ebml_read_skip(matroska);
2197
                break;
2198
        }
2199

    
2200
        if (matroska->level_up) {
2201
            matroska->level_up--;
2202
            break;
2203
        }
2204
    }
2205

    
2206
    if (res)
2207
        return res;
2208

    
2209
    if (size > 0)
2210
        res = matroska_parse_block(matroska, data, size, pos, cluster_time,
2211
                                   duration, is_keyframe);
2212

    
2213
    return res;
2214
}
2215

    
2216
static int
2217
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2218
{
2219
    int res = 0;
2220
    uint32_t id;
2221
    uint64_t cluster_time = 0;
2222
    uint8_t *data;
2223
    int64_t pos;
2224
    int size;
2225

    
2226
    av_log(matroska->ctx, AV_LOG_DEBUG,
2227
           "parsing cluster at %"PRId64"\n", url_ftell(matroska->ctx->pb));
2228

    
2229
    while (res == 0) {
2230
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2231
            res = AVERROR(EIO);
2232
            break;
2233
        } else if (matroska->level_up) {
2234
            matroska->level_up--;
2235
            break;
2236
        }
2237

    
2238
        switch (id) {
2239
            /* cluster timecode */
2240
            case MATROSKA_ID_CLUSTERTIMECODE: {
2241
                uint64_t num;
2242
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2243
                    break;
2244
                cluster_time = num;
2245
                break;
2246
            }
2247

    
2248
                /* a group of blocks inside a cluster */
2249
            case MATROSKA_ID_BLOCKGROUP:
2250
                if ((res = ebml_read_master(matroska, &id)) < 0)
2251
                    break;
2252
                res = matroska_parse_blockgroup(matroska, cluster_time);
2253
                break;
2254

    
2255
            case MATROSKA_ID_SIMPLEBLOCK:
2256
                pos = url_ftell(matroska->ctx->pb);
2257
                res = ebml_read_binary(matroska, &id, &data, &size);
2258
                if (res == 0)
2259
                    res = matroska_parse_block(matroska, data, size, pos,
2260
                                               cluster_time, AV_NOPTS_VALUE,
2261
                                               -1);
2262
                break;
2263

    
2264
            default:
2265
                av_log(matroska->ctx, AV_LOG_INFO,
2266
                       "Unknown entry 0x%x in cluster data\n", id);
2267
                /* fall-through */
2268

    
2269
            case EBML_ID_VOID:
2270
                res = ebml_read_skip(matroska);
2271
                break;
2272
        }
2273

    
2274
        if (matroska->level_up) {
2275
            matroska->level_up--;
2276
            break;
2277
        }
2278
    }
2279

    
2280
    return res;
2281
}
2282

    
2283
static int
2284
matroska_read_packet (AVFormatContext *s,
2285
                      AVPacket        *pkt)
2286
{
2287
    MatroskaDemuxContext *matroska = s->priv_data;
2288
    int res;
2289
    uint32_t id;
2290

    
2291
    /* Read stream until we have a packet queued. */
2292
    while (matroska_deliver_packet(matroska, pkt)) {
2293

    
2294
        /* Have we already reached the end? */
2295
        if (matroska->done)
2296
            return AVERROR(EIO);
2297

    
2298
        res = 0;
2299
        while (res == 0) {
2300
            if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2301
                return AVERROR(EIO);
2302
            } else if (matroska->level_up) {
2303
                matroska->level_up--;
2304
                break;
2305
            }
2306

    
2307
            switch (id) {
2308
                case MATROSKA_ID_CLUSTER:
2309
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2310
                        break;
2311
                    if ((res = matroska_parse_cluster(matroska)) == 0)
2312
                        res = 1; /* Parsed one cluster, let's get out. */
2313
                    break;
2314

    
2315
                default:
2316
                case EBML_ID_VOID:
2317
                    res = ebml_read_skip(matroska);
2318
                    break;
2319
            }
2320

    
2321
            if (matroska->level_up) {
2322
                matroska->level_up--;
2323
                break;
2324
            }
2325
        }
2326

    
2327
        if (res == -1)
2328
            matroska->done = 1;
2329
    }
2330

    
2331
    return 0;
2332
}
2333

    
2334
static int
2335
matroska_read_seek (AVFormatContext *s, int stream_index, int64_t timestamp,
2336
                    int flags)
2337
{
2338
    MatroskaDemuxContext *matroska = s->priv_data;
2339
    AVStream *st = s->streams[stream_index];
2340
    int index;
2341

    
2342
    /* find index entry */
2343
    index = av_index_search_timestamp(st, timestamp, flags);
2344
    if (index < 0)
2345
        return 0;
2346

    
2347
    matroska_clear_queue(matroska);
2348

    
2349
    /* do the seek */
2350
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
2351
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
2352
    matroska->skip_to_stream = st;
2353
    matroska->peek_id = 0;
2354
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
2355
    return 0;
2356
}
2357

    
2358
static int
2359
matroska_read_close (AVFormatContext *s)
2360
{
2361
    MatroskaDemuxContext *matroska = s->priv_data;
2362
    MatroskaTrack *tracks = matroska->tracks.elem;
2363
    int n = 0;
2364

    
2365
    matroska_clear_queue(matroska);
2366

    
2367
    for (n=0; n < matroska->tracks.nb_elem; n++)
2368
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
2369
            av_free(tracks[n].audio.buf);
2370
    ebml_free(matroska_tracks, matroska);
2371
    ebml_free(matroska_index, matroska);
2372

    
2373
    return 0;
2374
}
2375

    
2376
AVInputFormat matroska_demuxer = {
2377
    "matroska",
2378
    NULL_IF_CONFIG_SMALL("Matroska file format"),
2379
    sizeof(MatroskaDemuxContext),
2380
    matroska_probe,
2381
    matroska_read_header,
2382
    matroska_read_packet,
2383
    matroska_read_close,
2384
    matroska_read_seek,
2385
};