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1
/*
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 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 The ffmpeg Project
4
 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
19

    
20
/**
21
 * @file matroska.c
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 * Matroska file demuxer
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 * 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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 */
28

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

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

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

    
39
/* 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
47

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

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

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

    
58
/* 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
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66
/* IDs in the info master */
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#define MATROSKA_ID_TIMECODESCALE 0x2AD7B1
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#define MATROSKA_ID_DURATION   0x4489
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#define MATROSKA_ID_WRITINGAPP 0x5741
70
#define MATROSKA_ID_MUXINGAPP  0x4D80
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#define MATROSKA_ID_DATEUTC    0x4461
72

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

    
76
/* IDs in the trackentry master */
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#define MATROSKA_ID_TRACKNUMBER 0xD7
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#define MATROSKA_ID_TRACKUID   0x73C5
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#define MATROSKA_ID_TRACKTYPE  0x83
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#define MATROSKA_ID_TRACKAUDIO 0xE1
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#define MATROSKA_ID_TRACKVIDEO 0xE0
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#define MATROSKA_ID_CODECID    0x86
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#define MATROSKA_ID_CODECPRIVATE 0x63A2
84
#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
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#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
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#define MATROSKA_ID_TRACKFLAGENABLED 0xB9
90
#define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
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#define MATROSKA_ID_TRACKFLAGLACING 0x9C
92
#define MATROSKA_ID_TRACKMINCACHE 0x6DE7
93
#define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
94
#define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383
95

    
96
/* IDs in the trackvideo master */
97
#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
98
#define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
99
#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
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#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
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#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
102
#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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107
/* IDs in the trackaudio master */
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#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
109
#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
110
#define MATROSKA_ID_AUDIOCHANNELS 0x9F
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112
/* ID in the cues master */
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#define MATROSKA_ID_POINTENTRY 0xBB
114

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
184
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
185
#define MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED "V_UNCOMPRESSED"
186
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_SP     "V_MPEG4/ISO/SP"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP    "V_MPEG4/ISO/ASP"
188
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AP     "V_MPEG4/ISO/AP"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC    "V_MPEG4/ISO/AVC"
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#define MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3    "V_MPEG4/MS/V3"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG1        "V_MPEG1"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG2        "V_MPEG2"
193
#define MATROSKA_CODEC_ID_VIDEO_MJPEG        "V_MJPEG"
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/* TODO: Real/Quicktime */
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196
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
197
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L1     "A_MPEG/L1"
198
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2     "A_MPEG/L2"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3     "A_MPEG/L3"
200
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE   "A_PCM/INT/BIG"
201
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE   "A_PCM/INT/LIT"
202
#define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT    "A_PCM/FLOAT/IEEE"
203
#define MATROSKA_CODEC_ID_AUDIO_AC3          "A_AC3"
204
#define MATROSKA_CODEC_ID_AUDIO_DTS          "A_DTS"
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#define MATROSKA_CODEC_ID_AUDIO_VORBIS       "A_VORBIS"
206
#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG2        "A_AAC/MPEG2/"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG4        "A_AAC/MPEG4/"
209
/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
210

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

    
214
typedef struct Track {
215
    MatroskaTrackType type;
216

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

    
223
    char *name,
224
        *language;
225

    
226
    char *codec_id,
227
        *codec_name;
228

    
229
    unsigned char *codec_priv;
230
    int codec_priv_size;
231

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

    
236
typedef struct MatroskaVideoTrack {
237
    MatroskaTrack track;
238

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

    
244
    uint32_t fourcc;
245

    
246
    MatroskaAspectRatioMode ar_mode;
247
    MatroskaEyeMode eye_mode;
248

    
249
    //..
250
} MatroskaVideoTrack;
251

    
252
typedef struct MatroskaAudioTrack {
253
    MatroskaTrack track;
254

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

    
261
typedef struct MatroskaSubtitleTrack {
262
    MatroskaTrack track;
263

    
264
    //..
265
} MatroskaSubtitleTrack;
266

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

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

    
277
typedef struct MatroskaDemuxContext {
278
    AVFormatContext *ctx;
279

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
353
    return num;
354
}
355

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

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

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

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

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

    
406
    *number = total;
407

    
408
    return read;
409
}
410

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

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

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

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

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

    
441
    return read;
442
}
443

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

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

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

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

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

    
472
    assert(level_up != NULL);
473

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

    
477
    return id;
478
}
479

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

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

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

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

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

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

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

    
514
    url_fskip(pb, length);
515

    
516
    return 0;
517
}
518

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

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

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

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

    
550
    return 0;
551
}
552

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

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

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

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

    
590
    return 0;
591
}
592

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

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

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

    
612
    if (size == 4) {
613
        *num= av_int2flt(get_be32(pb));
614
    } else if(size==8){
615
        *num= av_int2dbl(get_be64(pb));
616
    } else if(size==10){
617
        av_log(matroska->ctx, AV_LOG_ERROR,
618
               "FIXME! 10-byte floats unimplemented\n");
619
        return AVERROR_UNKNOWN;
620
    } else{
621
        offset_t pos = url_ftell(pb);
622
        av_log(matroska->ctx, AV_LOG_ERROR,
623
               "Invalid float element size %d at position %llu (0x%llx)\n",
624
               size, pos, pos);
625
        return AVERROR_INVALIDDATA;
626
    }
627

    
628
    return 0;
629
}
630

    
631
/*
632
 * Read the next element as an ASCII string.
633
 * 0 is success, < 0 is failure.
634
 */
635

    
636
static int
637
ebml_read_ascii (MatroskaDemuxContext *matroska,
638
                 uint32_t             *id,
639
                 char                **str)
640
{
641
    ByteIOContext *pb = &matroska->ctx->pb;
642
    int size, res;
643
    uint64_t rlength;
644

    
645
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
646
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
647
        return res;
648
    size = rlength;
649

    
650
    /* ebml strings are usually not 0-terminated, so we allocate one
651
     * byte more, read the string and NULL-terminate it ourselves. */
652
    if (size < 0 || !(*str = av_malloc(size + 1))) {
653
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
654
        return AVERROR_NOMEM;
655
    }
656
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
657
        offset_t pos = url_ftell(pb);
658
        av_log(matroska->ctx, AV_LOG_ERROR,
659
               "Read error at pos. %llu (0x%llx)\n", pos, pos);
660
        return AVERROR_IO;
661
    }
662
    (*str)[size] = '\0';
663

    
664
    return 0;
665
}
666

    
667
/*
668
 * Read the next element as a UTF-8 string.
669
 * 0 is success, < 0 is failure.
670
 */
671

    
672
static int
673
ebml_read_utf8 (MatroskaDemuxContext *matroska,
674
                uint32_t             *id,
675
                char                **str)
676
{
677
  return ebml_read_ascii(matroska, id, str);
678
}
679

    
680
/*
681
 * Read the next element as a date (nanoseconds since 1/1/2000).
682
 * 0 is success, < 0 is failure.
683
 */
684

    
685
static int
686
ebml_read_date (MatroskaDemuxContext *matroska,
687
                uint32_t             *id,
688
                int64_t              *date)
689
{
690
  return ebml_read_sint(matroska, id, date);
691
}
692

    
693
/*
694
 * Read the next element, but only the header. The contents
695
 * are supposed to be sub-elements which can be read separately.
696
 * 0 is success, < 0 is failure.
697
 */
698

    
699
static int
700
ebml_read_master (MatroskaDemuxContext *matroska,
701
                  uint32_t             *id)
702
{
703
    ByteIOContext *pb = &matroska->ctx->pb;
704
    uint64_t length;
705
    MatroskaLevel *level;
706
    int res;
707

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

    
712
    /* protect... (Heaven forbids that the '>' is true) */
713
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
714
        av_log(matroska->ctx, AV_LOG_ERROR,
715
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
716
        return AVERROR_NOTSUPP;
717
    }
718

    
719
    /* remember level */
720
    level = &matroska->levels[matroska->num_levels++];
721
    level->start = url_ftell(pb);
722
    level->length = length;
723

    
724
    return 0;
725
}
726

    
727
/*
728
 * Read the next element as binary data.
729
 * 0 is success, < 0 is failure.
730
 */
731

    
732
static int
733
ebml_read_binary (MatroskaDemuxContext *matroska,
734
                  uint32_t             *id,
735
                  uint8_t             **binary,
736
                  int                  *size)
737
{
738
    ByteIOContext *pb = &matroska->ctx->pb;
739
    uint64_t rlength;
740
    int res;
741

    
742
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
743
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
744
        return res;
745
    *size = rlength;
746

    
747
    if (!(*binary = av_malloc(*size))) {
748
        av_log(matroska->ctx, AV_LOG_ERROR,
749
               "Memory allocation error\n");
750
        return AVERROR_NOMEM;
751
    }
752

    
753
    if (get_buffer(pb, *binary, *size) != *size) {
754
        offset_t pos = url_ftell(pb);
755
        av_log(matroska->ctx, AV_LOG_ERROR,
756
               "Read error at pos. %llu (0x%llx)\n", pos, pos);
757
        return AVERROR_IO;
758
    }
759

    
760
    return 0;
761
}
762

    
763
/*
764
 * Read signed/unsigned "EBML" numbers.
765
 * Return: number of bytes processed, < 0 on error.
766
 * XXX: use ebml_read_num().
767
 */
768

    
769
static int
770
matroska_ebmlnum_uint (uint8_t  *data,
771
                       uint32_t  size,
772
                       uint64_t *num)
773
{
774
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
775
    uint64_t total;
776

    
777
    if (size <= 0)
778
        return AVERROR_INVALIDDATA;
779

    
780
    total = data[0];
781
    while (read <= 8 && !(total & len_mask)) {
782
        read++;
783
        len_mask >>= 1;
784
    }
785
    if (read > 8)
786
        return AVERROR_INVALIDDATA;
787

    
788
    if ((total &= (len_mask - 1)) == len_mask - 1)
789
        num_ffs++;
790
    if (size < read)
791
        return AVERROR_INVALIDDATA;
792
    while (n < read) {
793
        if (data[n] == 0xff)
794
            num_ffs++;
795
        total = (total << 8) | data[n];
796
        n++;
797
    }
798

    
799
    if (!total)
800
        return AVERROR_INVALIDDATA;
801

    
802
    if (read == num_ffs)
803
        *num = (uint64_t)-1;
804
    else
805
        *num = total;
806

    
807
    return read;
808
}
809

    
810
/*
811
 * Same as above, but signed.
812
 */
813

    
814
static int
815
matroska_ebmlnum_sint (uint8_t  *data,
816
                       uint32_t  size,
817
                       int64_t  *num)
818
{
819
    uint64_t unum;
820
    int res;
821

    
822
    /* read as unsigned number first */
823
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
824
        return res;
825

    
826
    /* make signed (weird way) */
827
    if (unum == (uint64_t)-1)
828
        *num = INT64_MAX;
829
    else
830
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
831

    
832
    return res;
833
}
834

    
835
/*
836
 * Read an EBML header.
837
 * 0 is success, < 0 is failure.
838
 */
839

    
840
static int
841
ebml_read_header (MatroskaDemuxContext *matroska,
842
                  char                **doctype,
843
                  int                  *version)
844
{
845
    uint32_t id;
846
    int level_up, res = 0;
847

    
848
    /* default init */
849
    if (doctype)
850
        *doctype = NULL;
851
    if (version)
852
        *version = 1;
853

    
854
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
855
        level_up != 0 || id != EBML_ID_HEADER) {
856
        av_log(matroska->ctx, AV_LOG_ERROR,
857
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
858
        return AVERROR_INVALIDDATA;
859
    }
860
    if ((res = ebml_read_master(matroska, &id)) < 0)
861
        return res;
862

    
863
    while (res == 0) {
864
        if (!(id = ebml_peek_id(matroska, &level_up)))
865
            return AVERROR_IO;
866

    
867
        /* end-of-header */
868
        if (level_up)
869
            break;
870

    
871
        switch (id) {
872
            /* is our read version uptodate? */
873
            case EBML_ID_EBMLREADVERSION: {
874
                uint64_t num;
875

    
876
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
877
                    return res;
878
                if (num > EBML_VERSION) {
879
                    av_log(matroska->ctx, AV_LOG_ERROR,
880
                           "EBML version %llu (> %d) is not supported\n",
881
                           num, EBML_VERSION);
882
                    return AVERROR_INVALIDDATA;
883
                }
884
                break;
885
            }
886

    
887
            /* we only handle 8 byte lengths at max */
888
            case EBML_ID_EBMLMAXSIZELENGTH: {
889
                uint64_t num;
890

    
891
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
892
                    return res;
893
                if (num > sizeof(uint64_t)) {
894
                    av_log(matroska->ctx, AV_LOG_ERROR,
895
                           "Integers of size %llu (> %d) not supported\n",
896
                           num, sizeof(uint64_t));
897
                    return AVERROR_INVALIDDATA;
898
                }
899
                break;
900
            }
901

    
902
            /* we handle 4 byte IDs at max */
903
            case EBML_ID_EBMLMAXIDLENGTH: {
904
                uint64_t num;
905

    
906
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
907
                    return res;
908
                if (num > sizeof(uint32_t)) {
909
                    av_log(matroska->ctx, AV_LOG_ERROR,
910
                           "IDs of size %llu (> %u) not supported\n",
911
                            num, sizeof(uint32_t));
912
                    return AVERROR_INVALIDDATA;
913
                }
914
                break;
915
            }
916

    
917
            case EBML_ID_DOCTYPE: {
918
                char *text;
919

    
920
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
921
                    return res;
922
                if (doctype) {
923
                    if (*doctype)
924
                        av_free(*doctype);
925
                    *doctype = text;
926
                } else
927
                    av_free(text);
928
                break;
929
            }
930

    
931
            case EBML_ID_DOCTYPEREADVERSION: {
932
                uint64_t num;
933

    
934
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
935
                    return res;
936
                if (version)
937
                    *version = num;
938
                break;
939
            }
940

    
941
            default:
942
                av_log(matroska->ctx, AV_LOG_INFO,
943
                       "Unknown data type 0x%x in EBML header", id);
944
                /* pass-through */
945

    
946
            case EBML_ID_VOID:
947
            /* we ignore these two, as they don't tell us anything we
948
             * care about */
949
            case EBML_ID_EBMLVERSION:
950
            case EBML_ID_DOCTYPEVERSION:
951
                res = ebml_read_skip (matroska);
952
                break;
953
        }
954
    }
955

    
956
    return 0;
957
}
958

    
959
/*
960
 * Put one packet in an application-supplied AVPacket struct.
961
 * Returns 0 on success or -1 on failure.
962
 */
963

    
964
static int
965
matroska_deliver_packet (MatroskaDemuxContext *matroska,
966
                         AVPacket             *pkt)
967
{
968
    if (matroska->num_packets > 0) {
969
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
970
        av_free(matroska->packets[0]);
971
        if (matroska->num_packets > 1) {
972
            memmove(&matroska->packets[0], &matroska->packets[1],
973
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
974
            matroska->packets =
975
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
976
                           sizeof(AVPacket *));
977
        } else {
978
            av_free(matroska->packets);
979
            matroska->packets = NULL;
980
        }
981
        matroska->num_packets--;
982
        return 0;
983
    }
984

    
985
    return -1;
986
}
987

    
988
/*
989
 * Put a packet into our internal queue. Will be delivered to the
990
 * user/application during the next get_packet() call.
991
 */
992

    
993
static void
994
matroska_queue_packet (MatroskaDemuxContext *matroska,
995
                       AVPacket             *pkt)
996
{
997
    matroska->packets =
998
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
999
                   sizeof(AVPacket *));
1000
    matroska->packets[matroska->num_packets] = pkt;
1001
    matroska->num_packets++;
1002
}
1003

    
1004
/*
1005
 * Autodetecting...
1006
 */
1007

    
1008
static int
1009
matroska_probe (AVProbeData *p)
1010
{
1011
    uint64_t total = 0;
1012
    int len_mask = 0x80, size = 1, n = 1;
1013
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1014

    
1015
    if (p->buf_size < 5)
1016
        return 0;
1017

    
1018
    /* ebml header? */
1019
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1020
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1021
        return 0;
1022

    
1023
    /* length of header */
1024
    total = p->buf[4];
1025
    while (size <= 8 && !(total & len_mask)) {
1026
        size++;
1027
        len_mask >>= 1;
1028
    }
1029
    if (size > 8)
1030
      return 0;
1031
    total &= (len_mask - 1);
1032
    while (n < size)
1033
        total = (total << 8) | p->buf[4 + n++];
1034

    
1035
    /* does the probe data contain the whole header? */
1036
    if (p->buf_size < 4 + size + total)
1037
      return 0;
1038

    
1039
    /* the header must contain the document type 'matroska'. For now,
1040
     * we don't parse the whole header but simply check for the
1041
     * availability of that array of characters inside the header.
1042
     * Not fully fool-proof, but good enough. */
1043
    for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
1044
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1045
            return AVPROBE_SCORE_MAX;
1046

    
1047
    return 0;
1048
}
1049

    
1050
/*
1051
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1052
 */
1053

    
1054
static int
1055
matroska_parse_info (MatroskaDemuxContext *matroska)
1056
{
1057
    int res = 0;
1058
    uint32_t id;
1059

    
1060
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1061

    
1062
    while (res == 0) {
1063
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1064
            res = AVERROR_IO;
1065
            break;
1066
        } else if (matroska->level_up) {
1067
            matroska->level_up--;
1068
            break;
1069
        }
1070

    
1071
        switch (id) {
1072
            /* cluster timecode */
1073
            case MATROSKA_ID_TIMECODESCALE: {
1074
                uint64_t num;
1075
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1076
                    break;
1077
                matroska->time_scale = num;
1078
                break;
1079
            }
1080

    
1081
            case MATROSKA_ID_DURATION: {
1082
                double num;
1083
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1084
                    break;
1085
                matroska->duration = num * matroska->time_scale;
1086
                break;
1087
            }
1088

    
1089
            case MATROSKA_ID_WRITINGAPP: {
1090
                char *text;
1091
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1092
                    break;
1093
                matroska->writing_app = text;
1094
                break;
1095
            }
1096

    
1097
            case MATROSKA_ID_MUXINGAPP: {
1098
                char *text;
1099
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1100
                    break;
1101
                matroska->muxing_app = text;
1102
                break;
1103
            }
1104

    
1105
            case MATROSKA_ID_DATEUTC: {
1106
                int64_t time;
1107
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1108
                    break;
1109
                matroska->created = time;
1110
                break;
1111
            }
1112

    
1113
            default:
1114
                av_log(matroska->ctx, AV_LOG_INFO,
1115
                       "Unknown entry 0x%x in info header\n", id);
1116
                /* fall-through */
1117

    
1118
            case EBML_ID_VOID:
1119
                res = ebml_read_skip(matroska);
1120
                break;
1121
        }
1122

    
1123
        if (matroska->level_up) {
1124
            matroska->level_up--;
1125
            break;
1126
        }
1127
    }
1128

    
1129
    return res;
1130
}
1131

    
1132
static int
1133
matroska_add_stream (MatroskaDemuxContext *matroska)
1134
{
1135
    int res = 0;
1136
    uint32_t id;
1137
    MatroskaTrack *track;
1138

    
1139
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1140

    
1141
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1142
    track = av_mallocz(sizeof(MatroskaTrack));
1143
    matroska->num_tracks++;
1144

    
1145
    /* start with the master */
1146
    if ((res = ebml_read_master(matroska, &id)) < 0)
1147
        return res;
1148

    
1149
    /* try reading the trackentry headers */
1150
    while (res == 0) {
1151
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1152
            res = AVERROR_IO;
1153
            break;
1154
        } else if (matroska->level_up > 0) {
1155
            matroska->level_up--;
1156
            break;
1157
        }
1158

    
1159
        switch (id) {
1160
            /* track number (unique stream ID) */
1161
            case MATROSKA_ID_TRACKNUMBER: {
1162
                uint64_t num;
1163
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1164
                    break;
1165
                track->num = num;
1166
                break;
1167
            }
1168

    
1169
            /* track UID (unique identifier) */
1170
            case MATROSKA_ID_TRACKUID: {
1171
                uint64_t num;
1172
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1173
                    break;
1174
                track->uid = num;
1175
                break;
1176
            }
1177

    
1178
            /* track type (video, audio, combined, subtitle, etc.) */
1179
            case MATROSKA_ID_TRACKTYPE: {
1180
                uint64_t num;
1181
                if (track->type != 0) {
1182
                    av_log(matroska->ctx, AV_LOG_INFO,
1183
                           "More than one tracktype in an entry - skip\n");
1184
                    break;
1185
                }
1186
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1187
                    break;
1188
                track->type = num;
1189

    
1190
                /* ok, so we're actually going to reallocate this thing */
1191
                switch (track->type) {
1192
                    case MATROSKA_TRACK_TYPE_VIDEO:
1193
                        track = (MatroskaTrack *)
1194
                            av_realloc(track, sizeof(MatroskaVideoTrack));
1195
                        break;
1196
                    case MATROSKA_TRACK_TYPE_AUDIO:
1197
                        track = (MatroskaTrack *)
1198
                            av_realloc(track, sizeof(MatroskaAudioTrack));
1199
                        ((MatroskaAudioTrack *)track)->channels = 1;
1200
                        ((MatroskaAudioTrack *)track)->samplerate = 8000;
1201
                        break;
1202
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1203
                        track = (MatroskaTrack *)
1204
                            av_realloc(track, sizeof(MatroskaSubtitleTrack));
1205
                        break;
1206
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1207
                    case MATROSKA_TRACK_TYPE_LOGO:
1208
                    case MATROSKA_TRACK_TYPE_CONTROL:
1209
                    default:
1210
                        av_log(matroska->ctx, AV_LOG_INFO,
1211
                               "Unknown or unsupported track type 0x%x\n",
1212
                               track->type);
1213
                        track->type = 0;
1214
                        break;
1215
                }
1216
                matroska->tracks[matroska->num_tracks - 1] = track;
1217
                break;
1218
            }
1219

    
1220
            /* tracktype specific stuff for video */
1221
            case MATROSKA_ID_TRACKVIDEO: {
1222
                MatroskaVideoTrack *videotrack;
1223
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1224
                    av_log(matroska->ctx, AV_LOG_INFO,
1225
                           "video data in non-video track - ignoring\n");
1226
                    res = AVERROR_INVALIDDATA;
1227
                    break;
1228
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1229
                    break;
1230
                videotrack = (MatroskaVideoTrack *)track;
1231

    
1232
                while (res == 0) {
1233
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1234
                        res = AVERROR_IO;
1235
                        break;
1236
                    } else if (matroska->level_up > 0) {
1237
                        matroska->level_up--;
1238
                        break;
1239
                    }
1240

    
1241
                    switch (id) {
1242
                        /* fixme, this should be one-up, but I get it here */
1243
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1244
                            uint64_t num;
1245
                            if ((res = ebml_read_uint (matroska, &id,
1246
                                                       &num)) < 0)
1247
                                break;
1248
                            track->default_duration = num;
1249
                            break;
1250
                        }
1251

    
1252
                        /* video framerate */
1253
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1254
                            double num;
1255
                            if ((res = ebml_read_float(matroska, &id,
1256
                                                       &num)) < 0)
1257
                                break;
1258
                            track->default_duration = 1000000000 * (1. / num);
1259
                            break;
1260
                        }
1261

    
1262
                        /* width of the size to display the video at */
1263
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1264
                            uint64_t num;
1265
                            if ((res = ebml_read_uint(matroska, &id,
1266
                                                      &num)) < 0)
1267
                                break;
1268
                            videotrack->display_width = num;
1269
                            break;
1270
                        }
1271

    
1272
                        /* height of the size to display the video at */
1273
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1274
                            uint64_t num;
1275
                            if ((res = ebml_read_uint(matroska, &id,
1276
                                                      &num)) < 0)
1277
                                break;
1278
                            videotrack->display_height = num;
1279
                            break;
1280
                        }
1281

    
1282
                        /* width of the video in the file */
1283
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1284
                            uint64_t num;
1285
                            if ((res = ebml_read_uint(matroska, &id,
1286
                                                      &num)) < 0)
1287
                                break;
1288
                            videotrack->pixel_width = num;
1289
                            break;
1290
                        }
1291

    
1292
                        /* height of the video in the file */
1293
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1294
                            uint64_t num;
1295
                            if ((res = ebml_read_uint(matroska, &id,
1296
                                                      &num)) < 0)
1297
                                break;
1298
                            videotrack->pixel_height = num;
1299
                            break;
1300
                        }
1301

    
1302
                        /* whether the video is interlaced */
1303
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1304
                            uint64_t num;
1305
                            if ((res = ebml_read_uint(matroska, &id,
1306
                                                      &num)) < 0)
1307
                                break;
1308
                            if (num)
1309
                                track->flags |=
1310
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1311
                            else
1312
                                track->flags &=
1313
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1314
                            break;
1315
                        }
1316

    
1317
                        /* stereo mode (whether the video has two streams,
1318
                         * where one is for the left eye and the other for
1319
                         * the right eye, which creates a 3D-like
1320
                         * effect) */
1321
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1322
                            uint64_t num;
1323
                            if ((res = ebml_read_uint(matroska, &id,
1324
                                                      &num)) < 0)
1325
                                break;
1326
                            if (num != MATROSKA_EYE_MODE_MONO &&
1327
                                num != MATROSKA_EYE_MODE_LEFT &&
1328
                                num != MATROSKA_EYE_MODE_RIGHT &&
1329
                                num != MATROSKA_EYE_MODE_BOTH) {
1330
                                av_log(matroska->ctx, AV_LOG_INFO,
1331
                                       "Ignoring unknown eye mode 0x%x\n",
1332
                                       (uint32_t) num);
1333
                                break;
1334
                            }
1335
                            videotrack->eye_mode = num;
1336
                            break;
1337
                        }
1338

    
1339
                        /* aspect ratio behaviour */
1340
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1341
                            uint64_t num;
1342
                            if ((res = ebml_read_uint(matroska, &id,
1343
                                                      &num)) < 0)
1344
                                break;
1345
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1346
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1347
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1348
                                av_log(matroska->ctx, AV_LOG_INFO,
1349
                                       "Ignoring unknown aspect ratio 0x%x\n",
1350
                                       (uint32_t) num);
1351
                                break;
1352
                            }
1353
                            videotrack->ar_mode = num;
1354
                            break;
1355
                        }
1356

    
1357
                        /* colourspace (only matters for raw video)
1358
                         * fourcc */
1359
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1360
                            uint64_t num;
1361
                            if ((res = ebml_read_uint(matroska, &id,
1362
                                                      &num)) < 0)
1363
                                break;
1364
                            videotrack->fourcc = num;
1365
                            break;
1366
                        }
1367

    
1368
                        default:
1369
                            av_log(matroska->ctx, AV_LOG_INFO,
1370
                                   "Unknown video track header entry "
1371
                                   "0x%x - ignoring\n", id);
1372
                            /* pass-through */
1373

    
1374
                        case EBML_ID_VOID:
1375
                            res = ebml_read_skip(matroska);
1376
                            break;
1377
                    }
1378

    
1379
                    if (matroska->level_up) {
1380
                        matroska->level_up--;
1381
                        break;
1382
                    }
1383
                }
1384
                break;
1385
            }
1386

    
1387
            /* tracktype specific stuff for audio */
1388
            case MATROSKA_ID_TRACKAUDIO: {
1389
                MatroskaAudioTrack *audiotrack;
1390
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1391
                    av_log(matroska->ctx, AV_LOG_INFO,
1392
                           "audio data in non-audio track - ignoring\n");
1393
                    res = AVERROR_INVALIDDATA;
1394
                    break;
1395
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1396
                    break;
1397
                audiotrack = (MatroskaAudioTrack *)track;
1398

    
1399
                while (res == 0) {
1400
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1401
                        res = AVERROR_IO;
1402
                        break;
1403
                    } else if (matroska->level_up > 0) {
1404
                        matroska->level_up--;
1405
                        break;
1406
                    }
1407

    
1408
                    switch (id) {
1409
                        /* samplerate */
1410
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1411
                            double num;
1412
                            if ((res = ebml_read_float(matroska, &id,
1413
                                                       &num)) < 0)
1414
                                break;
1415
                            audiotrack->samplerate = num;
1416
                            break;
1417
                        }
1418

    
1419
                            /* bitdepth */
1420
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1421
                            uint64_t num;
1422
                            if ((res = ebml_read_uint(matroska, &id,
1423
                                                      &num)) < 0)
1424
                                break;
1425
                            audiotrack->bitdepth = num;
1426
                            break;
1427
                        }
1428

    
1429
                            /* channels */
1430
                        case MATROSKA_ID_AUDIOCHANNELS: {
1431
                            uint64_t num;
1432
                            if ((res = ebml_read_uint(matroska, &id,
1433
                                                      &num)) < 0)
1434
                                break;
1435
                            audiotrack->channels = num;
1436
                            break;
1437
                        }
1438

    
1439
                        default:
1440
                            av_log(matroska->ctx, AV_LOG_INFO,
1441
                                   "Unknown audio track header entry "
1442
                                   "0x%x - ignoring\n", id);
1443
                            /* pass-through */
1444

    
1445
                        case EBML_ID_VOID:
1446
                            res = ebml_read_skip(matroska);
1447
                            break;
1448
                    }
1449

    
1450
                    if (matroska->level_up) {
1451
                        matroska->level_up--;
1452
                        break;
1453
                    }
1454
                }
1455
                break;
1456
            }
1457

    
1458
                /* codec identifier */
1459
            case MATROSKA_ID_CODECID: {
1460
                char *text;
1461
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1462
                    break;
1463
                track->codec_id = text;
1464
                break;
1465
            }
1466

    
1467
                /* codec private data */
1468
            case MATROSKA_ID_CODECPRIVATE: {
1469
                uint8_t *data;
1470
                int size;
1471
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1472
                    break;
1473
                track->codec_priv = data;
1474
                track->codec_priv_size = size;
1475
                break;
1476
            }
1477

    
1478
                /* name of the codec */
1479
            case MATROSKA_ID_CODECNAME: {
1480
                char *text;
1481
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1482
                    break;
1483
                track->codec_name = text;
1484
                break;
1485
            }
1486

    
1487
                /* name of this track */
1488
            case MATROSKA_ID_TRACKNAME: {
1489
                char *text;
1490
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1491
                    break;
1492
                track->name = text;
1493
                break;
1494
            }
1495

    
1496
                /* language (matters for audio/subtitles, mostly) */
1497
            case MATROSKA_ID_TRACKLANGUAGE: {
1498
                char *text;
1499
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1500
                    break;
1501
                track->language = text;
1502
                break;
1503
            }
1504

    
1505
                /* whether this is actually used */
1506
            case MATROSKA_ID_TRACKFLAGENABLED: {
1507
                uint64_t num;
1508
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1509
                    break;
1510
                if (num)
1511
                    track->flags |= MATROSKA_TRACK_ENABLED;
1512
                else
1513
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1514
                break;
1515
            }
1516

    
1517
                /* whether it's the default for this track type */
1518
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1519
                uint64_t num;
1520
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1521
                    break;
1522
                if (num)
1523
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1524
                else
1525
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1526
                break;
1527
            }
1528

    
1529
                /* lacing (like MPEG, where blocks don't end/start on frame
1530
                 * boundaries) */
1531
            case MATROSKA_ID_TRACKFLAGLACING: {
1532
                uint64_t num;
1533
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1534
                    break;
1535
                if (num)
1536
                    track->flags |= MATROSKA_TRACK_LACING;
1537
                else
1538
                    track->flags &= ~MATROSKA_TRACK_LACING;
1539
                break;
1540
            }
1541

    
1542
                /* default length (in time) of one data block in this track */
1543
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1544
                uint64_t num;
1545
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1546
                    break;
1547
                track->default_duration = num;
1548
                break;
1549
            }
1550

    
1551
            default:
1552
                av_log(matroska->ctx, AV_LOG_INFO,
1553
                       "Unknown track header entry 0x%x - ignoring\n", id);
1554
                /* pass-through */
1555

    
1556
            case EBML_ID_VOID:
1557
            /* we ignore these because they're nothing useful. */
1558
            case MATROSKA_ID_CODECINFOURL:
1559
            case MATROSKA_ID_CODECDOWNLOADURL:
1560
            case MATROSKA_ID_TRACKMINCACHE:
1561
            case MATROSKA_ID_TRACKMAXCACHE:
1562
                res = ebml_read_skip(matroska);
1563
                break;
1564
        }
1565

    
1566
        if (matroska->level_up) {
1567
            matroska->level_up--;
1568
            break;
1569
        }
1570
    }
1571

    
1572
    return res;
1573
}
1574

    
1575
static int
1576
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1577
{
1578
    int res = 0;
1579
    uint32_t id;
1580

    
1581
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1582

    
1583
    while (res == 0) {
1584
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1585
            res = AVERROR_IO;
1586
            break;
1587
        } else if (matroska->level_up) {
1588
            matroska->level_up--;
1589
            break;
1590
        }
1591

    
1592
        switch (id) {
1593
            /* one track within the "all-tracks" header */
1594
            case MATROSKA_ID_TRACKENTRY:
1595
                res = matroska_add_stream(matroska);
1596
                break;
1597

    
1598
            default:
1599
                av_log(matroska->ctx, AV_LOG_INFO,
1600
                       "Unknown entry 0x%x in track header\n", id);
1601
                /* fall-through */
1602

    
1603
            case EBML_ID_VOID:
1604
                res = ebml_read_skip(matroska);
1605
                break;
1606
        }
1607

    
1608
        if (matroska->level_up) {
1609
            matroska->level_up--;
1610
            break;
1611
        }
1612
    }
1613

    
1614
    return res;
1615
}
1616

    
1617
static int
1618
matroska_parse_index (MatroskaDemuxContext *matroska)
1619
{
1620
    int res = 0;
1621
    uint32_t id;
1622
    MatroskaDemuxIndex idx;
1623

    
1624
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1625

    
1626
    while (res == 0) {
1627
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1628
            res = AVERROR_IO;
1629
            break;
1630
        } else if (matroska->level_up) {
1631
            matroska->level_up--;
1632
            break;
1633
        }
1634

    
1635
        switch (id) {
1636
            /* one single index entry ('point') */
1637
            case MATROSKA_ID_POINTENTRY:
1638
                if ((res = ebml_read_master(matroska, &id)) < 0)
1639
                    break;
1640

    
1641
                /* in the end, we hope to fill one entry with a
1642
                 * timestamp, a file position and a tracknum */
1643
                idx.pos   = (uint64_t) -1;
1644
                idx.time  = (uint64_t) -1;
1645
                idx.track = (uint16_t) -1;
1646

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

    
1656
                    switch (id) {
1657
                        /* one single index entry ('point') */
1658
                        case MATROSKA_ID_CUETIME: {
1659
                            int64_t time;
1660
                            if ((res = ebml_read_uint(matroska, &id,
1661
                                                      &time)) < 0)
1662
                                break;
1663
                            idx.time = time * matroska->time_scale;
1664
                            break;
1665
                        }
1666

    
1667
                        /* position in the file + track to which it 
1668
                         * belongs */
1669
                        case MATROSKA_ID_CUETRACKPOSITION:
1670
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1671
                                break;
1672

    
1673
                            while (res == 0) {
1674
                                if (!(id = ebml_peek_id (matroska,
1675
                                                    &matroska->level_up))) {
1676
                                    res = AVERROR_IO;
1677
                                    break;
1678
                                } else if (matroska->level_up) {
1679
                                    matroska->level_up--;
1680
                                    break;
1681
                                }
1682

    
1683
                                switch (id) {
1684
                                    /* track number */
1685
                                    case MATROSKA_ID_CUETRACK: {
1686
                                        uint64_t num;
1687
                                        if ((res = ebml_read_uint(matroska,
1688
                                                          &id, &num)) < 0)
1689
                                            break;
1690
                                        idx.track = num;
1691
                                        break;
1692
                                    }
1693

    
1694
                                        /* position in file */
1695
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1696
                                        uint64_t num;
1697
                                        if ((res = ebml_read_uint(matroska,
1698
                                                          &id, &num)) < 0)
1699
                                            break;
1700
                                        idx.pos = num;
1701
                                        break;
1702
                                    }
1703

    
1704
                                    default:
1705
                                        av_log(matroska->ctx, AV_LOG_INFO,
1706
                                               "Unknown entry 0x%x in "
1707
                                               "CuesTrackPositions\n", id);
1708
                                        /* fall-through */
1709

    
1710
                                    case EBML_ID_VOID:
1711
                                        res = ebml_read_skip(matroska);
1712
                                        break;
1713
                                }
1714

    
1715
                                if (matroska->level_up) {
1716
                                    matroska->level_up--;
1717
                                    break;
1718
                                }
1719
                            }
1720

    
1721
                            break;
1722

    
1723
                        default:
1724
                            av_log(matroska->ctx, AV_LOG_INFO,
1725
                                   "Unknown entry 0x%x in cuespoint "
1726
                                   "index\n", id);
1727
                            /* fall-through */
1728

    
1729
                        case EBML_ID_VOID:
1730
                            res = ebml_read_skip(matroska);
1731
                            break;
1732
                    }
1733

    
1734
                    if (matroska->level_up) {
1735
                        matroska->level_up--;
1736
                        break;
1737
                    }
1738
                }
1739

    
1740
                /* so let's see if we got what we wanted */
1741
                if (idx.pos   != (uint64_t) -1 &&
1742
                    idx.time  != (uint64_t) -1 &&
1743
                    idx.track != (uint16_t) -1) {
1744
                    if (matroska->num_indexes % 32 == 0) {
1745
                        /* re-allocate bigger index */
1746
                        matroska->index =
1747
                            av_realloc(matroska->index,
1748
                                       (matroska->num_indexes + 32) *
1749
                                       sizeof(MatroskaDemuxIndex));
1750
                    }
1751
                    matroska->index[matroska->num_indexes] = idx;
1752
                    matroska->num_indexes++;
1753
                }
1754
                break;
1755

    
1756
            default:
1757
                av_log(matroska->ctx, AV_LOG_INFO,
1758
                       "Unknown entry 0x%x in cues header\n", id);
1759
                /* fall-through */
1760

    
1761
            case EBML_ID_VOID:
1762
                res = ebml_read_skip(matroska);
1763
                break;
1764
        }
1765

    
1766
        if (matroska->level_up) {
1767
            matroska->level_up--;
1768
            break;
1769
        }
1770
    }
1771

    
1772
    return res;
1773
}
1774

    
1775
static int
1776
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1777
{
1778
    int res = 0;
1779
    uint32_t id;
1780

    
1781
    while (res == 0) {
1782
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1783
            res = AVERROR_IO;
1784
            break;
1785
        } else if (matroska->level_up) {
1786
            matroska->level_up--;
1787
            break;
1788
        }
1789

    
1790
        switch (id) {
1791
            /* Hm, this is unsupported... */
1792
            default:
1793
                av_log(matroska->ctx, AV_LOG_INFO,
1794
                       "Unknown entry 0x%x in metadata header\n", id);
1795
                /* fall-through */
1796

    
1797
            case EBML_ID_VOID:
1798
                res = ebml_read_skip(matroska);
1799
                break;
1800
        }
1801

    
1802
        if (matroska->level_up) {
1803
            matroska->level_up--;
1804
            break;
1805
        }
1806
    }
1807

    
1808
    return res;
1809
}
1810

    
1811
static int
1812
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1813
{
1814
    int res = 0;
1815
    uint32_t id;
1816

    
1817
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1818

    
1819
    while (res == 0) {
1820
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1821
            res = AVERROR_IO;
1822
            break;
1823
        } else if (matroska->level_up) {
1824
            matroska->level_up--;
1825
            break;
1826
        }
1827

    
1828
        switch (id) {
1829
            case MATROSKA_ID_SEEKENTRY: {
1830
                uint32_t seek_id = 0, peek_id_cache = 0;
1831
                uint64_t seek_pos = (uint64_t) -1, t;
1832

    
1833
                if ((res = ebml_read_master(matroska, &id)) < 0)
1834
                    break;
1835

    
1836
                while (res == 0) {
1837
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1838
                        res = AVERROR_IO;
1839
                        break;
1840
                    } else if (matroska->level_up) {
1841
                        matroska->level_up--;
1842
                        break;
1843
                    }
1844

    
1845
                    switch (id) {
1846
                        case MATROSKA_ID_SEEKID:
1847
                            res = ebml_read_uint(matroska, &id, &t);
1848
                            seek_id = t;
1849
                            break;
1850

    
1851
                        case MATROSKA_ID_SEEKPOSITION:
1852
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1853
                            break;
1854

    
1855
                        default:
1856
                            av_log(matroska->ctx, AV_LOG_INFO,
1857
                                   "Unknown seekhead ID 0x%x\n", id);
1858
                            /* fall-through */
1859

    
1860
                        case EBML_ID_VOID:
1861
                            res = ebml_read_skip(matroska);
1862
                            break;
1863
                    }
1864

    
1865
                    if (matroska->level_up) {
1866
                        matroska->level_up--;
1867
                        break;
1868
                    }
1869
                }
1870

    
1871
                if (!seek_id || seek_pos == (uint64_t) -1) {
1872
                    av_log(matroska->ctx, AV_LOG_INFO,
1873
                           "Incomplete seekhead entry (0x%x/%llu)\n",
1874
                           seek_id, seek_pos);
1875
                    break;
1876
                }
1877

    
1878
                switch (seek_id) {
1879
                    case MATROSKA_ID_CUES:
1880
                    case MATROSKA_ID_TAGS: {
1881
                        uint32_t level_up = matroska->level_up;
1882
                        offset_t before_pos;
1883
                        uint64_t length;
1884
                        MatroskaLevel level;
1885

    
1886
                        /* remember the peeked ID and the current position */
1887
                        peek_id_cache = matroska->peek_id;
1888
                        before_pos = url_ftell(&matroska->ctx->pb);
1889

    
1890
                        /* seek */
1891
                        if ((res = ebml_read_seek(matroska, seek_pos +
1892
                                               matroska->segment_start)) < 0)
1893
                            return res;
1894

    
1895
                        /* we don't want to lose our seekhead level, so we add
1896
                         * a dummy. This is a crude hack. */
1897
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1898
                            av_log(matroska->ctx, AV_LOG_INFO,
1899
                                   "Max EBML element depth (%d) reached, "
1900
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1901
                            return AVERROR_UNKNOWN;
1902
                        }
1903
                            
1904
                        level.start = 0;
1905
                        level.length = (uint64_t)-1;
1906
                        matroska->levels[matroska->num_levels] = level;
1907
                        matroska->num_levels++;
1908

    
1909
                        /* check ID */
1910
                        if (!(id = ebml_peek_id (matroska,
1911
                                                 &matroska->level_up)))
1912
                            break;
1913
                        if (id != seek_id) {
1914
                            av_log(matroska->ctx, AV_LOG_INFO,
1915
                                   "We looked for ID=0x%x but got "
1916
                                   "ID=0x%x (pos=%llu)",
1917
                                   seek_id, id, seek_pos +
1918
                                   matroska->segment_start);
1919
                            goto finish;
1920
                        }
1921

    
1922
                        /* read master + parse */
1923
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1924
                            break;
1925
                        switch (id) {
1926
                            case MATROSKA_ID_CUES:
1927
                                if (!(res = matroska_parse_index(matroska)) ||
1928
                                    url_feof(&matroska->ctx->pb)) {
1929
                                    matroska->index_parsed = 1;
1930
                                    res = 0;
1931
                                }
1932
                                break;
1933
                            case MATROSKA_ID_TAGS:
1934
                                if (!(res = matroska_parse_metadata(matroska)) ||
1935
                                   url_feof(&matroska->ctx->pb)) {
1936
                                    matroska->metadata_parsed = 1;
1937
                                    res = 0;
1938
                                }
1939
                                break;
1940
                        }
1941
                        if (res < 0)
1942
                            break;
1943

    
1944
                    finish:
1945
                        /* remove dummy level */
1946
                        while (matroska->num_levels) {
1947
                            matroska->num_levels--;
1948
                            length =
1949
                                matroska->levels[matroska->num_levels].length;
1950
                            if (length == (uint64_t)-1)
1951
                                break;
1952
                        }
1953

    
1954
                        /* seek back */
1955
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1956
                            return res;
1957
                        matroska->peek_id = peek_id_cache;
1958
                        matroska->level_up = level_up;
1959
                        break;
1960
                    }
1961

    
1962
                    default:
1963
                        av_log(matroska->ctx, AV_LOG_INFO,
1964
                               "Ignoring seekhead entry for ID=0x%x\n",
1965
                               seek_id);
1966
                        break;
1967
                }
1968

    
1969
                break;
1970
            }
1971

    
1972
            default:
1973
                av_log(matroska->ctx, AV_LOG_INFO,
1974
                       "Unknown seekhead ID 0x%x\n", id);
1975
                /* fall-through */
1976

    
1977
            case EBML_ID_VOID:
1978
                res = ebml_read_skip(matroska);
1979
                break;
1980
        }
1981

    
1982
        if (matroska->level_up) {
1983
            matroska->level_up--;
1984
            break;
1985
        }
1986
    }
1987

    
1988
    return res;
1989
}
1990

    
1991
static int
1992
matroska_read_header (AVFormatContext    *s,
1993
                      AVFormatParameters *ap)
1994
{
1995
    MatroskaDemuxContext *matroska = s->priv_data;
1996
    char *doctype;
1997
    int version, last_level, res = 0;
1998
    uint32_t id;
1999

    
2000
    matroska->ctx = s;
2001

    
2002
    /* First read the EBML header. */
2003
    doctype = NULL;
2004
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2005
        return res;
2006
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2007
        av_log(matroska->ctx, AV_LOG_ERROR,
2008
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2009
               doctype ? doctype : "(none)");
2010
        if (doctype)
2011
            av_free(doctype);
2012
        return AVERROR_NOFMT;
2013
    }
2014
    av_free(doctype);
2015
    if (version != 1) {
2016
        av_log(matroska->ctx, AV_LOG_ERROR,
2017
               "Matroska demuxer version 1 too old for file version %d\n",
2018
               version);
2019
        return AVERROR_NOFMT;
2020
    }
2021

    
2022
    /* The next thing is a segment. */
2023
    while (1) {
2024
        if (!(id = ebml_peek_id(matroska, &last_level)))
2025
            return AVERROR_IO;
2026
        if (id == MATROSKA_ID_SEGMENT)
2027
            break;
2028

    
2029
        /* oi! */
2030
        av_log(matroska->ctx, AV_LOG_INFO,
2031
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2032
               MATROSKA_ID_SEGMENT, id);
2033
        if ((res = ebml_read_skip(matroska)) < 0)
2034
            return res;
2035
    }
2036

    
2037
    /* We now have a Matroska segment.
2038
     * Seeks are from the beginning of the segment,
2039
     * after the segment ID/length. */
2040
    if ((res = ebml_read_master(matroska, &id)) < 0)
2041
        return res;
2042
    matroska->segment_start = url_ftell(&s->pb);
2043

    
2044
    matroska->time_scale = 1000000;
2045
    /* we've found our segment, start reading the different contents in here */
2046
    while (res == 0) {
2047
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2048
            res = AVERROR_IO;
2049
            break;
2050
        } else if (matroska->level_up) {
2051
            matroska->level_up--;
2052
            break;
2053
        }
2054

    
2055
        switch (id) {
2056
            /* stream info */
2057
            case MATROSKA_ID_INFO: {
2058
                if ((res = ebml_read_master(matroska, &id)) < 0)
2059
                    break;
2060
                res = matroska_parse_info(matroska);
2061
                break;
2062
            }
2063

    
2064
            /* track info headers */
2065
            case MATROSKA_ID_TRACKS: {
2066
                if ((res = ebml_read_master(matroska, &id)) < 0)
2067
                    break;
2068
                res = matroska_parse_tracks(matroska);
2069
                break;
2070
            }
2071

    
2072
            /* stream index */
2073
            case MATROSKA_ID_CUES: {
2074
                if (!matroska->index_parsed) {
2075
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2076
                        break;
2077
                    res = matroska_parse_index(matroska);
2078
                } else
2079
                    res = ebml_read_skip(matroska);
2080
                break;
2081
            }
2082

    
2083
            /* metadata */
2084
            case MATROSKA_ID_TAGS: {
2085
                if (!matroska->metadata_parsed) {
2086
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2087
                        break;
2088
                    res = matroska_parse_metadata(matroska);
2089
                } else
2090
                    res = ebml_read_skip(matroska);
2091
                break;
2092
            }
2093

    
2094
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2095
            case MATROSKA_ID_SEEKHEAD: {
2096
                if ((res = ebml_read_master(matroska, &id)) < 0)
2097
                    break;
2098
                res = matroska_parse_seekhead(matroska);
2099
                break;
2100
            }
2101

    
2102
            case MATROSKA_ID_CLUSTER: {
2103
                /* Do not read the master - this will be done in the next
2104
                 * call to matroska_read_packet. */
2105
                res = 1;
2106
                break;
2107
            }
2108

    
2109
            default:
2110
                av_log(matroska->ctx, AV_LOG_INFO,
2111
                       "Unknown matroska file header ID 0x%x\n", id);
2112
            /* fall-through */
2113

    
2114
            case EBML_ID_VOID:
2115
                res = ebml_read_skip(matroska);
2116
                break;
2117
        }
2118

    
2119
        if (matroska->level_up) {
2120
            matroska->level_up--;
2121
            break;
2122
        }
2123
    }
2124

    
2125
    if (res < 0)
2126
        return res;
2127

    
2128
    /* Have we found a cluster? */
2129
    if (res == 1) {
2130
        int i;
2131
        enum CodecID codec_id;
2132
        MatroskaTrack *track;
2133
        AVStream *st;
2134
        void *extradata = NULL;
2135
        int extradata_size = 0;
2136

    
2137
        for (i = 0; i < matroska->num_tracks; i++) {
2138
            track = matroska->tracks[i];
2139

    
2140
            /* libavformat does not really support subtitles.
2141
             * Also apply some sanity checks. */
2142
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2143
                (track->codec_id == NULL))
2144
                continue;
2145

    
2146
            /* Set the FourCC from the CodecID. */
2147
            /* This is the MS compatibility mode which stores a
2148
             * BITMAPINFOHEADER in the CodecPrivate. */
2149
            if (!strcmp(track->codec_id,
2150
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2151
                (track->codec_priv_size >= 40) &&
2152
                (track->codec_priv != NULL)) {
2153
                unsigned char *p;
2154

    
2155
                /* Offset of biCompression. Stored in LE. */
2156
                p = (unsigned char *)track->codec_priv + 16;
2157
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2158
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2159
                codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2160

    
2161
            } else if (!strcmp(track->codec_id,
2162
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
2163
                       !strcmp(track->codec_id,
2164
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
2165
                       !strcmp(track->codec_id,
2166
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
2167
                codec_id = CODEC_ID_MPEG4;
2168
            else if (!strcmp(track->codec_id,
2169
                             MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC))
2170
                codec_id = CODEC_ID_H264;
2171
/*             else if (!strcmp(track->codec_id, */
2172
/*                              MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
2173
/*                 codec_id = CODEC_ID_???; */
2174
            else if (!strcmp(track->codec_id,
2175
                             MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
2176
                codec_id = CODEC_ID_MSMPEG4V3;
2177
            else if (!strcmp(track->codec_id,
2178
                             MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
2179
                     !strcmp(track->codec_id,
2180
                             MATROSKA_CODEC_ID_VIDEO_MPEG2))
2181
                codec_id = CODEC_ID_MPEG2VIDEO;
2182

    
2183
            /* This is the MS compatibility mode which stores a
2184
             * WAVEFORMATEX in the CodecPrivate. */
2185
            else if (!strcmp(track->codec_id, 
2186
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2187
                (track->codec_priv_size >= 18) &&
2188
                (track->codec_priv != NULL)) {
2189
                unsigned char *p;
2190
                uint16_t tag;
2191

    
2192
                /* Offset of wFormatTag. Stored in LE. */
2193
                p = (unsigned char *)track->codec_priv;
2194
                tag = (p[1] << 8) | p[0];
2195
                codec_id = codec_get_wav_id(tag);
2196

    
2197
            } else if (!strcmp(track->codec_id,
2198
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
2199
                       !strcmp(track->codec_id,
2200
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
2201
                       !strcmp(track->codec_id,
2202
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
2203
                codec_id = CODEC_ID_MP3;
2204
            else if (!strcmp(track->codec_id,
2205
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
2206
                codec_id = CODEC_ID_PCM_U16BE;
2207
            else if (!strcmp(track->codec_id,
2208
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
2209
                codec_id = CODEC_ID_PCM_U16LE;
2210
/*             else if (!strcmp(track->codec_id, */
2211
/*                              MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
2212
/*                 codec_id = CODEC_ID_PCM_???; */
2213
            else if (!strcmp(track->codec_id,
2214
                             MATROSKA_CODEC_ID_AUDIO_AC3))
2215
                codec_id = CODEC_ID_AC3;
2216
            else if (!strcmp(track->codec_id,
2217
                             MATROSKA_CODEC_ID_AUDIO_DTS))
2218
                codec_id = CODEC_ID_DTS;
2219
            /* No such codec id so far. */
2220
/*             else if (!strcmp(track->codec_id, */
2221
/*                              MATROSKA_CODEC_ID_AUDIO_DTS)) */
2222
/*                 codec_id = CODEC_ID_DTS; */
2223
            else if (!strcmp(track->codec_id,
2224
                             MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
2225
                extradata_size = track->codec_priv_size;
2226
                if(extradata_size) {
2227
                    extradata = av_malloc(extradata_size);
2228
                    if(extradata == NULL)
2229
                        return AVERROR_NOMEM;
2230
                    memcpy(extradata, track->codec_priv, extradata_size);
2231
                }
2232
                codec_id = CODEC_ID_VORBIS;
2233
            } else if (!strcmp(track->codec_id,
2234
                               MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
2235
                       !strcmp(track->codec_id,
2236
                               MATROSKA_CODEC_ID_AUDIO_MPEG4))
2237
                codec_id = CODEC_ID_AAC;
2238
            else
2239
                codec_id = CODEC_ID_NONE;
2240

    
2241
            if (codec_id == CODEC_ID_NONE) {
2242
                av_log(matroska->ctx, AV_LOG_INFO,
2243
                       "Unknown/unsupported CodecID %s.\n",
2244
                       track->codec_id);
2245
            }
2246

    
2247
            track->stream_index = matroska->num_streams;
2248

    
2249
            matroska->num_streams++;
2250
            st = av_new_stream(s, track->stream_index);
2251
            if (st == NULL)
2252
                return AVERROR_NOMEM;
2253
            av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
2254

    
2255
            st->codec->codec_id = codec_id;
2256

    
2257
            if(extradata){
2258
                st->codec->extradata = extradata;
2259
                st->codec->extradata_size = extradata_size;
2260
            } else if(track->codec_priv && track->codec_priv_size > 0){
2261
                st->codec->extradata = av_malloc(track->codec_priv_size);
2262
                if(st->codec->extradata == NULL)
2263
                    return AVERROR_NOMEM;
2264
                st->codec->extradata_size = track->codec_priv_size;
2265
                memcpy(st->codec->extradata, track->codec_priv,
2266
                       track->codec_priv_size);
2267
            }
2268

    
2269
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2270
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2271

    
2272
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2273
                st->codec->codec_tag = videotrack->fourcc;
2274
                st->codec->width = videotrack->pixel_width;
2275
                st->codec->height = videotrack->pixel_height;
2276
                if (videotrack->display_width == 0)
2277
                    st->codec->sample_aspect_ratio.num =
2278
                        videotrack->pixel_width;
2279
                else
2280
                    st->codec->sample_aspect_ratio.num =
2281
                        videotrack->display_width;
2282
                if (videotrack->display_height == 0)
2283
                    st->codec->sample_aspect_ratio.num =
2284
                        videotrack->pixel_height;
2285
                else
2286
                    st->codec->sample_aspect_ratio.num =
2287
                        videotrack->display_height;
2288

    
2289
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2290
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2291

    
2292
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2293
                st->codec->sample_rate = audiotrack->samplerate;
2294
                st->codec->channels = audiotrack->channels;
2295
            }
2296

    
2297
            /* What do we do with private data? E.g. for Vorbis. */
2298
        }
2299
    }
2300

    
2301
    return 0;
2302
}
2303

    
2304
static int
2305
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2306
                            int                   num)
2307
{
2308
    int i;
2309

    
2310
    for (i = 0; i < matroska->num_tracks; i++)
2311
        if (matroska->tracks[i]->num == num)
2312
            return i;
2313

    
2314
    return -1;
2315
}
2316

    
2317
static int
2318
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2319
                           uint64_t              cluster_time)
2320
{
2321
    int res = 0;
2322
    uint32_t id;
2323
    AVPacket *pkt;
2324
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2325

    
2326
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2327

    
2328
    while (res == 0) {
2329
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2330
            res = AVERROR_IO;
2331
            break;
2332
        } else if (matroska->level_up) {
2333
            matroska->level_up--;
2334
            break;
2335
        }
2336

    
2337
        switch (id) {
2338
            /* one block inside the group. Note, block parsing is one
2339
             * of the harder things, so this code is a bit complicated.
2340
             * See http://www.matroska.org/ for documentation. */
2341
            case MATROSKA_ID_BLOCK: {
2342
                uint8_t *data, *origdata;
2343
                int size;
2344
                uint64_t time;
2345
                uint32_t *lace_size = NULL;
2346
                int n, track, flags, laces = 0;
2347
                uint64_t num;
2348
                int64_t pos= url_ftell(&matroska->ctx->pb);
2349

    
2350
                if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2351
                    break;
2352
                origdata = data;
2353

    
2354
                /* first byte(s): blocknum */
2355
                if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2356
                    av_log(matroska->ctx, AV_LOG_ERROR,
2357
                           "EBML block data error\n");
2358
                    av_free(origdata);
2359
                    break;
2360
                }
2361
                data += n;
2362
                size -= n;
2363

    
2364
                /* fetch track from num */
2365
                track = matroska_find_track_by_num(matroska, num);
2366
                if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2367
                    av_log(matroska->ctx, AV_LOG_INFO,
2368
                           "Invalid stream %d or size %u\n", track, size);
2369
                    av_free(origdata);
2370
                    break;
2371
                }
2372
                if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2373
                    av_free(origdata);
2374
                    break;                
2375
                }
2376

    
2377
                /* time (relative to cluster time) */
2378
                time = ((data[0] << 8) | data[1]) * matroska->time_scale;
2379
                data += 2;
2380
                size -= 2;
2381
                flags = *data;
2382
                data += 1;
2383
                size -= 1;
2384
                switch ((flags & 0x06) >> 1) {
2385
                    case 0x0: /* no lacing */
2386
                        laces = 1;
2387
                        lace_size = av_mallocz(sizeof(int));
2388
                        lace_size[0] = size;
2389
                        break;
2390

    
2391
                    case 0x1: /* xiph lacing */
2392
                    case 0x2: /* fixed-size lacing */
2393
                    case 0x3: /* EBML lacing */
2394
                        if (size == 0) {
2395
                            res = -1;
2396
                            break;
2397
                        }
2398
                        laces = (*data) + 1;
2399
                        data += 1;
2400
                        size -= 1;
2401
                        lace_size = av_mallocz(laces * sizeof(int));
2402

    
2403
                        switch ((flags & 0x06) >> 1) {
2404
                            case 0x1: /* xiph lacing */ {
2405
                                uint8_t temp;
2406
                                uint32_t total = 0;
2407
                                for (n = 0; res == 0 && n < laces - 1; n++) {
2408
                                    while (1) {
2409
                                        if (size == 0) {
2410
                                            res = -1;
2411
                                            break;
2412
                                        }
2413
                                        temp = *data;
2414
                                        lace_size[n] += temp;
2415
                                        data += 1;
2416
                                        size -= 1;
2417
                                        if (temp != 0xff)
2418
                                            break;
2419
                                    }
2420
                                    total += lace_size[n];
2421
                                }
2422
                                lace_size[n] = size - total;
2423
                                break;
2424
                            }
2425

    
2426
                            case 0x2: /* fixed-size lacing */
2427
                                for (n = 0; n < laces; n++)
2428
                                    lace_size[n] = size / laces;
2429
                                break;
2430

    
2431
                            case 0x3: /* EBML lacing */ {
2432
                                uint32_t total;
2433
                                n = matroska_ebmlnum_uint(data, size, &num);
2434
                                if (n < 0) {
2435
                                    av_log(matroska->ctx, AV_LOG_INFO,
2436
                                           "EBML block data error\n");
2437
                                    break;
2438
                                }
2439
                                data += n;
2440
                                size -= n;
2441
                                total = lace_size[0] = num;
2442
                                for (n = 1; res == 0 && n < laces - 1; n++) {
2443
                                    int64_t snum;
2444
                                    int r;
2445
                                    r = matroska_ebmlnum_sint (data, size,
2446
                                                               &snum);
2447
                                    if (r < 0) {
2448
                                        av_log(matroska->ctx, AV_LOG_INFO,
2449
                                               "EBML block data error\n");
2450
                                        break;
2451
                                    }
2452
                                    data += r;
2453
                                    size -= r;
2454
                                    lace_size[n] = lace_size[n - 1] + snum;
2455
                                    total += lace_size[n];
2456
                                }
2457
                                lace_size[n] = size - total;
2458
                                break;
2459
                            }
2460
                        }
2461
                        break;
2462
                }
2463

    
2464
                if (res == 0) {
2465
                    for (n = 0; n < laces; n++) {
2466
                        uint64_t timecode = 0;
2467

    
2468
                        pkt = av_mallocz(sizeof(AVPacket));
2469
                        /* XXX: prevent data copy... */
2470
                        if (av_new_packet(pkt,lace_size[n]) < 0) {
2471
                            res = AVERROR_NOMEM;
2472
                            break;
2473
                        }
2474
                        if (cluster_time != (uint64_t)-1) {
2475
                            if (time < 0 && (-time) > cluster_time)
2476
                                timecode = cluster_time;
2477
                            else
2478
                                timecode = cluster_time + time;
2479
                        }
2480
                        /* FIXME: duration */
2481

    
2482
                        memcpy(pkt->data, data, lace_size[n]);
2483
                        data += lace_size[n];
2484
                        if (n == 0)
2485
                            pkt->flags = is_keyframe;
2486
                        pkt->stream_index =
2487
                            matroska->tracks[track]->stream_index;
2488

    
2489
                        pkt->pts = timecode / 1000000; /* ns to ms */
2490
                        pkt->pos= pos;
2491

    
2492
                        matroska_queue_packet(matroska, pkt);
2493
                    }
2494
                }
2495

    
2496
                av_free(lace_size);
2497
                av_free(origdata);
2498
                break;
2499
            }
2500

    
2501
            case MATROSKA_ID_BLOCKDURATION: {
2502
                uint64_t num;
2503
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2504
                    break;
2505
                av_log(matroska->ctx, AV_LOG_INFO,
2506
                       "FIXME: implement support for BlockDuration\n");
2507
                break;
2508
            }
2509

    
2510
            case MATROSKA_ID_BLOCKREFERENCE:
2511
                /* We've found a reference, so not even the first frame in
2512
                 * the lace is a key frame. */
2513
                is_keyframe = 0;
2514
                if (last_num_packets != matroska->num_packets)
2515
                    matroska->packets[last_num_packets]->flags = 0;
2516
                res = ebml_read_skip(matroska);
2517
                break;
2518

    
2519
            default:
2520
                av_log(matroska->ctx, AV_LOG_INFO,
2521
                       "Unknown entry 0x%x in blockgroup data\n", id);
2522
                /* fall-through */
2523

    
2524
            case EBML_ID_VOID:
2525
                res = ebml_read_skip(matroska);
2526
                break;
2527
        }
2528

    
2529
        if (matroska->level_up) {
2530
            matroska->level_up--;
2531
            break;
2532
        }
2533
    }
2534

    
2535
    return res;
2536
}
2537

    
2538
static int
2539
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2540
{
2541
    int res = 0;
2542
    uint32_t id;
2543
    uint64_t cluster_time = 0;
2544

    
2545
    av_log(matroska->ctx, AV_LOG_DEBUG,
2546
           "parsing cluster at %lld\n", url_ftell(&matroska->ctx->pb));
2547

    
2548
    while (res == 0) {
2549
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2550
            res = AVERROR_IO;
2551
            break;
2552
        } else if (matroska->level_up) {
2553
            matroska->level_up--;
2554
            break;
2555
        }
2556

    
2557
        switch (id) {
2558
            /* cluster timecode */
2559
            case MATROSKA_ID_CLUSTERTIMECODE: {
2560
                uint64_t num;
2561
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2562
                    break;
2563
                cluster_time = num * matroska->time_scale;
2564
                break;
2565
            }
2566

    
2567
                /* a group of blocks inside a cluster */
2568
            case MATROSKA_ID_BLOCKGROUP:
2569
                if ((res = ebml_read_master(matroska, &id)) < 0)
2570
                    break;
2571
                res = matroska_parse_blockgroup(matroska, cluster_time);
2572
                break;
2573

    
2574
            default:
2575
                av_log(matroska->ctx, AV_LOG_INFO,
2576
                       "Unknown entry 0x%x in cluster data\n", id);
2577
                /* fall-through */
2578

    
2579
            case EBML_ID_VOID:
2580
                res = ebml_read_skip(matroska);
2581
                break;
2582
        }
2583

    
2584
        if (matroska->level_up) {
2585
            matroska->level_up--;
2586
            break;
2587
        }
2588
    }
2589

    
2590
    return res;
2591
}
2592

    
2593
static int
2594
matroska_read_packet (AVFormatContext *s,
2595
                      AVPacket        *pkt)
2596
{
2597
    MatroskaDemuxContext *matroska = s->priv_data;
2598
    int res = 0;
2599
    uint32_t id;
2600

    
2601
    /* Do we still have a packet queued? */
2602
    if (matroska_deliver_packet(matroska, pkt) == 0)
2603
        return 0;
2604

    
2605
    /* Have we already reached the end? */
2606
    if (matroska->done)
2607
        return AVERROR_IO;
2608

    
2609
    while (res == 0) {
2610
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2611
            res = AVERROR_IO;
2612
            break;
2613
        } else if (matroska->level_up) {
2614
            matroska->level_up--;
2615
            break;
2616
        }
2617

    
2618
        switch (id) {
2619
            case MATROSKA_ID_CLUSTER:
2620
                if ((res = ebml_read_master(matroska, &id)) < 0)
2621
                    break;
2622
                if ((res = matroska_parse_cluster(matroska)) == 0)
2623
                    res = 1; /* Parsed one cluster, let's get out. */
2624
                break;
2625

    
2626
            default:
2627
            case EBML_ID_VOID:
2628
                res = ebml_read_skip(matroska);
2629
                break;
2630
        }
2631

    
2632
        if (matroska->level_up) {
2633
            matroska->level_up--;
2634
            break;
2635
        }
2636
    }
2637

    
2638
    if (res == -1)
2639
        matroska->done = 1;
2640

    
2641
    return matroska_deliver_packet(matroska, pkt);
2642
}
2643

    
2644
static int
2645
matroska_read_close (AVFormatContext *s)
2646
{
2647
    MatroskaDemuxContext *matroska = s->priv_data;
2648
    int n = 0;
2649

    
2650
    if (matroska->writing_app)
2651
        av_free(matroska->writing_app);
2652
    if (matroska->muxing_app)
2653
        av_free(matroska->muxing_app);
2654
    if (matroska->index)
2655
        av_free(matroska->index);
2656

    
2657
    if (matroska->packets != NULL) {
2658
        for (n = 0; n < matroska->num_packets; n++) {
2659
            av_free_packet(matroska->packets[n]);
2660
            av_free(matroska->packets[n]);
2661
        }
2662
        av_free(matroska->packets);
2663
    }
2664

    
2665
    for (n = 0; n < matroska->num_tracks; n++) {
2666
        MatroskaTrack *track = matroska->tracks[n];
2667
        if (track->codec_id)
2668
            av_free(track->codec_id);
2669
        if (track->codec_name)
2670
            av_free(track->codec_name);
2671
        if (track->codec_priv)
2672
            av_free(track->codec_priv);
2673
        if (track->name)
2674
            av_free(track->name);
2675
        if (track->language)
2676
            av_free(track->language);
2677

    
2678
        av_free(track);
2679
    }
2680

    
2681
    for (n = 0; n < s->nb_streams; n++) {
2682
        av_free(s->streams[n]->codec->extradata);
2683
    }
2684

    
2685
    memset(matroska, 0, sizeof(MatroskaDemuxContext));
2686

    
2687
    return 0;
2688
}
2689

    
2690
static AVInputFormat matroska_iformat = {
2691
    "matroska",
2692
    "Matroska file format",
2693
    sizeof(MatroskaDemuxContext),
2694
    matroska_probe,
2695
    matroska_read_header,
2696
    matroska_read_packet,
2697
    matroska_read_close,
2698
};
2699

    
2700
int
2701
matroska_init(void)
2702
{
2703
    av_register_input_format(&matroska_iformat);
2704
    return 0;
2705
}