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1
/*
2
 * Matroska file demuxer (no muxer yet)
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 * Copyright (c) 2003-2004 The ffmpeg Project
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 *
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 * This library is free software; you can redistribute it and/or
6
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
19

    
20
/**
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 * @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. */
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#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.
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 */
54

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

    
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/* 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
65

    
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
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#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
83
#define MATROSKA_ID_CODECPRIVATE 0x63A2
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#define MATROSKA_ID_CODECNAME  0x258688
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#define MATROSKA_ID_CODECINFOURL 0x3B4040
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#define MATROSKA_ID_CODECDOWNLOADURL 0x26B240
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#define MATROSKA_ID_TRACKNAME  0x536E
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#define MATROSKA_ID_TRACKLANGUAGE 0x22B59C
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#define MATROSKA_ID_TRACKFLAGENABLED 0xB9
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#define MATROSKA_ID_TRACKFLAGDEFAULT 0x88
91
#define MATROSKA_ID_TRACKFLAGLACING 0x9C
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#define MATROSKA_ID_TRACKMINCACHE 0x6DE7
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#define MATROSKA_ID_TRACKMAXCACHE 0x6DF8
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#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
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#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
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#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
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#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
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#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
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107
/* IDs in the trackaudio master */
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#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
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#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
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#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 */
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#define MATROSKA_ID_CUETIME    0xB3
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#define MATROSKA_ID_CUETRACKPOSITION 0xB7
118

    
119
/* IDs in the cuetrackposition master */
120
#define MATROSKA_ID_CUETRACK   0xF7
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#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
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#define MATROSKA_ID_BLOCKDURATION 0x9B
140
#define MATROSKA_ID_BLOCKREFERENCE 0xFB
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142
typedef enum {
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  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
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  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,
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  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
149
} MatroskaTrackType;
150

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

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

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

    
169
typedef enum {
170
  MATROSKA_TRACK_ENABLED = (1<<0),
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  MATROSKA_TRACK_DEFAULT = (1<<1),
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  MATROSKA_TRACK_LACING  = (1<<2),
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  MATROSKA_TRACK_SHIFT   = (1<<16)
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} 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"
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#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"
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#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"
192
#define MATROSKA_CODEC_ID_VIDEO_MPEG2        "V_MPEG2"
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#define MATROSKA_CODEC_ID_VIDEO_MJPEG        "V_MJPEG"
194
/* 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"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2     "A_MPEG/L2"
199
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3     "A_MPEG/L3"
200
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE   "A_PCM/INT/BIG"
201
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE   "A_PCM/INT/LIT"
202
#define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT    "A_PCM/FLOAT/IEEE"
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#define MATROSKA_CODEC_ID_AUDIO_AC3          "A_AC3"
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#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. %"PRIu64" (0x%"PRIx64")\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 %"PRIu64" (0x%"PRIx64")\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 %"PRId64" (0x%"PRIx64")\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 %"PRId64" (0x%"PRIx64")\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 %"PRIu64" (0x%"PRIx64")\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. %"PRIu64" (0x%"PRIx64")\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. %"PRIu64" (0x%"PRIx64")\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 (read == num_ffs)
800
        *num = (uint64_t)-1;
801
    else
802
        *num = total;
803

    
804
    return read;
805
}
806

    
807
/*
808
 * Same as above, but signed.
809
 */
810

    
811
static int
812
matroska_ebmlnum_sint (uint8_t  *data,
813
                       uint32_t  size,
814
                       int64_t  *num)
815
{
816
    uint64_t unum;
817
    int res;
818

    
819
    /* read as unsigned number first */
820
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
821
        return res;
822

    
823
    /* make signed (weird way) */
824
    if (unum == (uint64_t)-1)
825
        *num = INT64_MAX;
826
    else
827
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
828

    
829
    return res;
830
}
831

    
832
/*
833
 * Read an EBML header.
834
 * 0 is success, < 0 is failure.
835
 */
836

    
837
static int
838
ebml_read_header (MatroskaDemuxContext *matroska,
839
                  char                **doctype,
840
                  int                  *version)
841
{
842
    uint32_t id;
843
    int level_up, res = 0;
844

    
845
    /* default init */
846
    if (doctype)
847
        *doctype = NULL;
848
    if (version)
849
        *version = 1;
850

    
851
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
852
        level_up != 0 || id != EBML_ID_HEADER) {
853
        av_log(matroska->ctx, AV_LOG_ERROR,
854
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
855
        return AVERROR_INVALIDDATA;
856
    }
857
    if ((res = ebml_read_master(matroska, &id)) < 0)
858
        return res;
859

    
860
    while (res == 0) {
861
        if (!(id = ebml_peek_id(matroska, &level_up)))
862
            return AVERROR_IO;
863

    
864
        /* end-of-header */
865
        if (level_up)
866
            break;
867

    
868
        switch (id) {
869
            /* is our read version uptodate? */
870
            case EBML_ID_EBMLREADVERSION: {
871
                uint64_t num;
872

    
873
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
874
                    return res;
875
                if (num > EBML_VERSION) {
876
                    av_log(matroska->ctx, AV_LOG_ERROR,
877
                           "EBML version %"PRIu64" (> %d) is not supported\n",
878
                           num, EBML_VERSION);
879
                    return AVERROR_INVALIDDATA;
880
                }
881
                break;
882
            }
883

    
884
            /* we only handle 8 byte lengths at max */
885
            case EBML_ID_EBMLMAXSIZELENGTH: {
886
                uint64_t num;
887

    
888
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
889
                    return res;
890
                if (num > sizeof(uint64_t)) {
891
                    av_log(matroska->ctx, AV_LOG_ERROR,
892
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
893
                           num, sizeof(uint64_t));
894
                    return AVERROR_INVALIDDATA;
895
                }
896
                break;
897
            }
898

    
899
            /* we handle 4 byte IDs at max */
900
            case EBML_ID_EBMLMAXIDLENGTH: {
901
                uint64_t num;
902

    
903
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
904
                    return res;
905
                if (num > sizeof(uint32_t)) {
906
                    av_log(matroska->ctx, AV_LOG_ERROR,
907
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
908
                            num, sizeof(uint32_t));
909
                    return AVERROR_INVALIDDATA;
910
                }
911
                break;
912
            }
913

    
914
            case EBML_ID_DOCTYPE: {
915
                char *text;
916

    
917
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
918
                    return res;
919
                if (doctype) {
920
                    if (*doctype)
921
                        av_free(*doctype);
922
                    *doctype = text;
923
                } else
924
                    av_free(text);
925
                break;
926
            }
927

    
928
            case EBML_ID_DOCTYPEREADVERSION: {
929
                uint64_t num;
930

    
931
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
932
                    return res;
933
                if (version)
934
                    *version = num;
935
                break;
936
            }
937

    
938
            default:
939
                av_log(matroska->ctx, AV_LOG_INFO,
940
                       "Unknown data type 0x%x in EBML header", id);
941
                /* pass-through */
942

    
943
            case EBML_ID_VOID:
944
            /* we ignore these two, as they don't tell us anything we
945
             * care about */
946
            case EBML_ID_EBMLVERSION:
947
            case EBML_ID_DOCTYPEVERSION:
948
                res = ebml_read_skip (matroska);
949
                break;
950
        }
951
    }
952

    
953
    return 0;
954
}
955

    
956
/*
957
 * Put one packet in an application-supplied AVPacket struct.
958
 * Returns 0 on success or -1 on failure.
959
 */
960

    
961
static int
962
matroska_deliver_packet (MatroskaDemuxContext *matroska,
963
                         AVPacket             *pkt)
964
{
965
    if (matroska->num_packets > 0) {
966
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
967
        av_free(matroska->packets[0]);
968
        if (matroska->num_packets > 1) {
969
            memmove(&matroska->packets[0], &matroska->packets[1],
970
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
971
            matroska->packets =
972
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
973
                           sizeof(AVPacket *));
974
        } else {
975
            av_free(matroska->packets);
976
            matroska->packets = NULL;
977
        }
978
        matroska->num_packets--;
979
        return 0;
980
    }
981

    
982
    return -1;
983
}
984

    
985
/*
986
 * Put a packet into our internal queue. Will be delivered to the
987
 * user/application during the next get_packet() call.
988
 */
989

    
990
static void
991
matroska_queue_packet (MatroskaDemuxContext *matroska,
992
                       AVPacket             *pkt)
993
{
994
    matroska->packets =
995
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
996
                   sizeof(AVPacket *));
997
    matroska->packets[matroska->num_packets] = pkt;
998
    matroska->num_packets++;
999
}
1000

    
1001
/*
1002
 * Autodetecting...
1003
 */
1004

    
1005
static int
1006
matroska_probe (AVProbeData *p)
1007
{
1008
    uint64_t total = 0;
1009
    int len_mask = 0x80, size = 1, n = 1;
1010
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1011

    
1012
    if (p->buf_size < 5)
1013
        return 0;
1014

    
1015
    /* ebml header? */
1016
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1017
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1018
        return 0;
1019

    
1020
    /* length of header */
1021
    total = p->buf[4];
1022
    while (size <= 8 && !(total & len_mask)) {
1023
        size++;
1024
        len_mask >>= 1;
1025
    }
1026
    if (size > 8)
1027
      return 0;
1028
    total &= (len_mask - 1);
1029
    while (n < size)
1030
        total = (total << 8) | p->buf[4 + n++];
1031

    
1032
    /* does the probe data contain the whole header? */
1033
    if (p->buf_size < 4 + size + total)
1034
      return 0;
1035

    
1036
    /* the header must contain the document type 'matroska'. For now,
1037
     * we don't parse the whole header but simply check for the
1038
     * availability of that array of characters inside the header.
1039
     * Not fully fool-proof, but good enough. */
1040
    for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
1041
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1042
            return AVPROBE_SCORE_MAX;
1043

    
1044
    return 0;
1045
}
1046

    
1047
/*
1048
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1049
 */
1050

    
1051
static int
1052
matroska_parse_info (MatroskaDemuxContext *matroska)
1053
{
1054
    int res = 0;
1055
    uint32_t id;
1056

    
1057
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1058

    
1059
    while (res == 0) {
1060
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1061
            res = AVERROR_IO;
1062
            break;
1063
        } else if (matroska->level_up) {
1064
            matroska->level_up--;
1065
            break;
1066
        }
1067

    
1068
        switch (id) {
1069
            /* cluster timecode */
1070
            case MATROSKA_ID_TIMECODESCALE: {
1071
                uint64_t num;
1072
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1073
                    break;
1074
                matroska->time_scale = num;
1075
                break;
1076
            }
1077

    
1078
            case MATROSKA_ID_DURATION: {
1079
                double num;
1080
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1081
                    break;
1082
                matroska->duration = num * matroska->time_scale;
1083
                break;
1084
            }
1085

    
1086
            case MATROSKA_ID_WRITINGAPP: {
1087
                char *text;
1088
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1089
                    break;
1090
                matroska->writing_app = text;
1091
                break;
1092
            }
1093

    
1094
            case MATROSKA_ID_MUXINGAPP: {
1095
                char *text;
1096
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1097
                    break;
1098
                matroska->muxing_app = text;
1099
                break;
1100
            }
1101

    
1102
            case MATROSKA_ID_DATEUTC: {
1103
                int64_t time;
1104
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1105
                    break;
1106
                matroska->created = time;
1107
                break;
1108
            }
1109

    
1110
            default:
1111
                av_log(matroska->ctx, AV_LOG_INFO,
1112
                       "Unknown entry 0x%x in info header\n", id);
1113
                /* fall-through */
1114

    
1115
            case EBML_ID_VOID:
1116
                res = ebml_read_skip(matroska);
1117
                break;
1118
        }
1119

    
1120
        if (matroska->level_up) {
1121
            matroska->level_up--;
1122
            break;
1123
        }
1124
    }
1125

    
1126
    return res;
1127
}
1128

    
1129
static int
1130
matroska_add_stream (MatroskaDemuxContext *matroska)
1131
{
1132
    int res = 0;
1133
    uint32_t id;
1134
    MatroskaTrack *track;
1135

    
1136
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1137

    
1138
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1139
    track = av_mallocz(sizeof(MatroskaTrack));
1140
    matroska->num_tracks++;
1141

    
1142
    /* start with the master */
1143
    if ((res = ebml_read_master(matroska, &id)) < 0)
1144
        return res;
1145

    
1146
    /* try reading the trackentry headers */
1147
    while (res == 0) {
1148
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1149
            res = AVERROR_IO;
1150
            break;
1151
        } else if (matroska->level_up > 0) {
1152
            matroska->level_up--;
1153
            break;
1154
        }
1155

    
1156
        switch (id) {
1157
            /* track number (unique stream ID) */
1158
            case MATROSKA_ID_TRACKNUMBER: {
1159
                uint64_t num;
1160
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1161
                    break;
1162
                track->num = num;
1163
                break;
1164
            }
1165

    
1166
            /* track UID (unique identifier) */
1167
            case MATROSKA_ID_TRACKUID: {
1168
                uint64_t num;
1169
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1170
                    break;
1171
                track->uid = num;
1172
                break;
1173
            }
1174

    
1175
            /* track type (video, audio, combined, subtitle, etc.) */
1176
            case MATROSKA_ID_TRACKTYPE: {
1177
                uint64_t num;
1178
                if (track->type != 0) {
1179
                    av_log(matroska->ctx, AV_LOG_INFO,
1180
                           "More than one tracktype in an entry - skip\n");
1181
                    break;
1182
                }
1183
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1184
                    break;
1185
                track->type = num;
1186

    
1187
                /* ok, so we're actually going to reallocate this thing */
1188
                switch (track->type) {
1189
                    case MATROSKA_TRACK_TYPE_VIDEO:
1190
                        track = (MatroskaTrack *)
1191
                            av_realloc(track, sizeof(MatroskaVideoTrack));
1192
                        break;
1193
                    case MATROSKA_TRACK_TYPE_AUDIO:
1194
                        track = (MatroskaTrack *)
1195
                            av_realloc(track, sizeof(MatroskaAudioTrack));
1196
                        ((MatroskaAudioTrack *)track)->channels = 1;
1197
                        ((MatroskaAudioTrack *)track)->samplerate = 8000;
1198
                        break;
1199
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1200
                        track = (MatroskaTrack *)
1201
                            av_realloc(track, sizeof(MatroskaSubtitleTrack));
1202
                        break;
1203
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1204
                    case MATROSKA_TRACK_TYPE_LOGO:
1205
                    case MATROSKA_TRACK_TYPE_CONTROL:
1206
                    default:
1207
                        av_log(matroska->ctx, AV_LOG_INFO,
1208
                               "Unknown or unsupported track type 0x%x\n",
1209
                               track->type);
1210
                        track->type = 0;
1211
                        break;
1212
                }
1213
                matroska->tracks[matroska->num_tracks - 1] = track;
1214
                break;
1215
            }
1216

    
1217
            /* tracktype specific stuff for video */
1218
            case MATROSKA_ID_TRACKVIDEO: {
1219
                MatroskaVideoTrack *videotrack;
1220
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1221
                    av_log(matroska->ctx, AV_LOG_INFO,
1222
                           "video data in non-video track - ignoring\n");
1223
                    res = AVERROR_INVALIDDATA;
1224
                    break;
1225
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1226
                    break;
1227
                videotrack = (MatroskaVideoTrack *)track;
1228

    
1229
                while (res == 0) {
1230
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1231
                        res = AVERROR_IO;
1232
                        break;
1233
                    } else if (matroska->level_up > 0) {
1234
                        matroska->level_up--;
1235
                        break;
1236
                    }
1237

    
1238
                    switch (id) {
1239
                        /* fixme, this should be one-up, but I get it here */
1240
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1241
                            uint64_t num;
1242
                            if ((res = ebml_read_uint (matroska, &id,
1243
                                                       &num)) < 0)
1244
                                break;
1245
                            track->default_duration = num;
1246
                            break;
1247
                        }
1248

    
1249
                        /* video framerate */
1250
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1251
                            double num;
1252
                            if ((res = ebml_read_float(matroska, &id,
1253
                                                       &num)) < 0)
1254
                                break;
1255
                            track->default_duration = 1000000000 * (1. / num);
1256
                            break;
1257
                        }
1258

    
1259
                        /* width of the size to display the video at */
1260
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1261
                            uint64_t num;
1262
                            if ((res = ebml_read_uint(matroska, &id,
1263
                                                      &num)) < 0)
1264
                                break;
1265
                            videotrack->display_width = num;
1266
                            break;
1267
                        }
1268

    
1269
                        /* height of the size to display the video at */
1270
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1271
                            uint64_t num;
1272
                            if ((res = ebml_read_uint(matroska, &id,
1273
                                                      &num)) < 0)
1274
                                break;
1275
                            videotrack->display_height = num;
1276
                            break;
1277
                        }
1278

    
1279
                        /* width of the video in the file */
1280
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1281
                            uint64_t num;
1282
                            if ((res = ebml_read_uint(matroska, &id,
1283
                                                      &num)) < 0)
1284
                                break;
1285
                            videotrack->pixel_width = num;
1286
                            break;
1287
                        }
1288

    
1289
                        /* height of the video in the file */
1290
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1291
                            uint64_t num;
1292
                            if ((res = ebml_read_uint(matroska, &id,
1293
                                                      &num)) < 0)
1294
                                break;
1295
                            videotrack->pixel_height = num;
1296
                            break;
1297
                        }
1298

    
1299
                        /* whether the video is interlaced */
1300
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1301
                            uint64_t num;
1302
                            if ((res = ebml_read_uint(matroska, &id,
1303
                                                      &num)) < 0)
1304
                                break;
1305
                            if (num)
1306
                                track->flags |=
1307
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1308
                            else
1309
                                track->flags &=
1310
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1311
                            break;
1312
                        }
1313

    
1314
                        /* stereo mode (whether the video has two streams,
1315
                         * where one is for the left eye and the other for
1316
                         * the right eye, which creates a 3D-like
1317
                         * effect) */
1318
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1319
                            uint64_t num;
1320
                            if ((res = ebml_read_uint(matroska, &id,
1321
                                                      &num)) < 0)
1322
                                break;
1323
                            if (num != MATROSKA_EYE_MODE_MONO &&
1324
                                num != MATROSKA_EYE_MODE_LEFT &&
1325
                                num != MATROSKA_EYE_MODE_RIGHT &&
1326
                                num != MATROSKA_EYE_MODE_BOTH) {
1327
                                av_log(matroska->ctx, AV_LOG_INFO,
1328
                                       "Ignoring unknown eye mode 0x%x\n",
1329
                                       (uint32_t) num);
1330
                                break;
1331
                            }
1332
                            videotrack->eye_mode = num;
1333
                            break;
1334
                        }
1335

    
1336
                        /* aspect ratio behaviour */
1337
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1338
                            uint64_t num;
1339
                            if ((res = ebml_read_uint(matroska, &id,
1340
                                                      &num)) < 0)
1341
                                break;
1342
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1343
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1344
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1345
                                av_log(matroska->ctx, AV_LOG_INFO,
1346
                                       "Ignoring unknown aspect ratio 0x%x\n",
1347
                                       (uint32_t) num);
1348
                                break;
1349
                            }
1350
                            videotrack->ar_mode = num;
1351
                            break;
1352
                        }
1353

    
1354
                        /* colourspace (only matters for raw video)
1355
                         * fourcc */
1356
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1357
                            uint64_t num;
1358
                            if ((res = ebml_read_uint(matroska, &id,
1359
                                                      &num)) < 0)
1360
                                break;
1361
                            videotrack->fourcc = num;
1362
                            break;
1363
                        }
1364

    
1365
                        default:
1366
                            av_log(matroska->ctx, AV_LOG_INFO,
1367
                                   "Unknown video track header entry "
1368
                                   "0x%x - ignoring\n", id);
1369
                            /* pass-through */
1370

    
1371
                        case EBML_ID_VOID:
1372
                            res = ebml_read_skip(matroska);
1373
                            break;
1374
                    }
1375

    
1376
                    if (matroska->level_up) {
1377
                        matroska->level_up--;
1378
                        break;
1379
                    }
1380
                }
1381
                break;
1382
            }
1383

    
1384
            /* tracktype specific stuff for audio */
1385
            case MATROSKA_ID_TRACKAUDIO: {
1386
                MatroskaAudioTrack *audiotrack;
1387
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1388
                    av_log(matroska->ctx, AV_LOG_INFO,
1389
                           "audio data in non-audio track - ignoring\n");
1390
                    res = AVERROR_INVALIDDATA;
1391
                    break;
1392
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1393
                    break;
1394
                audiotrack = (MatroskaAudioTrack *)track;
1395

    
1396
                while (res == 0) {
1397
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1398
                        res = AVERROR_IO;
1399
                        break;
1400
                    } else if (matroska->level_up > 0) {
1401
                        matroska->level_up--;
1402
                        break;
1403
                    }
1404

    
1405
                    switch (id) {
1406
                        /* samplerate */
1407
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1408
                            double num;
1409
                            if ((res = ebml_read_float(matroska, &id,
1410
                                                       &num)) < 0)
1411
                                break;
1412
                            audiotrack->samplerate = num;
1413
                            break;
1414
                        }
1415

    
1416
                            /* bitdepth */
1417
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1418
                            uint64_t num;
1419
                            if ((res = ebml_read_uint(matroska, &id,
1420
                                                      &num)) < 0)
1421
                                break;
1422
                            audiotrack->bitdepth = num;
1423
                            break;
1424
                        }
1425

    
1426
                            /* channels */
1427
                        case MATROSKA_ID_AUDIOCHANNELS: {
1428
                            uint64_t num;
1429
                            if ((res = ebml_read_uint(matroska, &id,
1430
                                                      &num)) < 0)
1431
                                break;
1432
                            audiotrack->channels = num;
1433
                            break;
1434
                        }
1435

    
1436
                        default:
1437
                            av_log(matroska->ctx, AV_LOG_INFO,
1438
                                   "Unknown audio track header entry "
1439
                                   "0x%x - ignoring\n", id);
1440
                            /* pass-through */
1441

    
1442
                        case EBML_ID_VOID:
1443
                            res = ebml_read_skip(matroska);
1444
                            break;
1445
                    }
1446

    
1447
                    if (matroska->level_up) {
1448
                        matroska->level_up--;
1449
                        break;
1450
                    }
1451
                }
1452
                break;
1453
            }
1454

    
1455
                /* codec identifier */
1456
            case MATROSKA_ID_CODECID: {
1457
                char *text;
1458
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1459
                    break;
1460
                track->codec_id = text;
1461
                break;
1462
            }
1463

    
1464
                /* codec private data */
1465
            case MATROSKA_ID_CODECPRIVATE: {
1466
                uint8_t *data;
1467
                int size;
1468
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1469
                    break;
1470
                track->codec_priv = data;
1471
                track->codec_priv_size = size;
1472
                break;
1473
            }
1474

    
1475
                /* name of the codec */
1476
            case MATROSKA_ID_CODECNAME: {
1477
                char *text;
1478
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1479
                    break;
1480
                track->codec_name = text;
1481
                break;
1482
            }
1483

    
1484
                /* name of this track */
1485
            case MATROSKA_ID_TRACKNAME: {
1486
                char *text;
1487
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1488
                    break;
1489
                track->name = text;
1490
                break;
1491
            }
1492

    
1493
                /* language (matters for audio/subtitles, mostly) */
1494
            case MATROSKA_ID_TRACKLANGUAGE: {
1495
                char *text;
1496
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1497
                    break;
1498
                track->language = text;
1499
                break;
1500
            }
1501

    
1502
                /* whether this is actually used */
1503
            case MATROSKA_ID_TRACKFLAGENABLED: {
1504
                uint64_t num;
1505
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1506
                    break;
1507
                if (num)
1508
                    track->flags |= MATROSKA_TRACK_ENABLED;
1509
                else
1510
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1511
                break;
1512
            }
1513

    
1514
                /* whether it's the default for this track type */
1515
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1516
                uint64_t num;
1517
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1518
                    break;
1519
                if (num)
1520
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1521
                else
1522
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1523
                break;
1524
            }
1525

    
1526
                /* lacing (like MPEG, where blocks don't end/start on frame
1527
                 * boundaries) */
1528
            case MATROSKA_ID_TRACKFLAGLACING: {
1529
                uint64_t num;
1530
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1531
                    break;
1532
                if (num)
1533
                    track->flags |= MATROSKA_TRACK_LACING;
1534
                else
1535
                    track->flags &= ~MATROSKA_TRACK_LACING;
1536
                break;
1537
            }
1538

    
1539
                /* default length (in time) of one data block in this track */
1540
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1541
                uint64_t num;
1542
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1543
                    break;
1544
                track->default_duration = num;
1545
                break;
1546
            }
1547

    
1548
            default:
1549
                av_log(matroska->ctx, AV_LOG_INFO,
1550
                       "Unknown track header entry 0x%x - ignoring\n", id);
1551
                /* pass-through */
1552

    
1553
            case EBML_ID_VOID:
1554
            /* we ignore these because they're nothing useful. */
1555
            case MATROSKA_ID_CODECINFOURL:
1556
            case MATROSKA_ID_CODECDOWNLOADURL:
1557
            case MATROSKA_ID_TRACKMINCACHE:
1558
            case MATROSKA_ID_TRACKMAXCACHE:
1559
                res = ebml_read_skip(matroska);
1560
                break;
1561
        }
1562

    
1563
        if (matroska->level_up) {
1564
            matroska->level_up--;
1565
            break;
1566
        }
1567
    }
1568

    
1569
    return res;
1570
}
1571

    
1572
static int
1573
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1574
{
1575
    int res = 0;
1576
    uint32_t id;
1577

    
1578
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1579

    
1580
    while (res == 0) {
1581
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1582
            res = AVERROR_IO;
1583
            break;
1584
        } else if (matroska->level_up) {
1585
            matroska->level_up--;
1586
            break;
1587
        }
1588

    
1589
        switch (id) {
1590
            /* one track within the "all-tracks" header */
1591
            case MATROSKA_ID_TRACKENTRY:
1592
                res = matroska_add_stream(matroska);
1593
                break;
1594

    
1595
            default:
1596
                av_log(matroska->ctx, AV_LOG_INFO,
1597
                       "Unknown entry 0x%x in track header\n", id);
1598
                /* fall-through */
1599

    
1600
            case EBML_ID_VOID:
1601
                res = ebml_read_skip(matroska);
1602
                break;
1603
        }
1604

    
1605
        if (matroska->level_up) {
1606
            matroska->level_up--;
1607
            break;
1608
        }
1609
    }
1610

    
1611
    return res;
1612
}
1613

    
1614
static int
1615
matroska_parse_index (MatroskaDemuxContext *matroska)
1616
{
1617
    int res = 0;
1618
    uint32_t id;
1619
    MatroskaDemuxIndex idx;
1620

    
1621
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1622

    
1623
    while (res == 0) {
1624
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1625
            res = AVERROR_IO;
1626
            break;
1627
        } else if (matroska->level_up) {
1628
            matroska->level_up--;
1629
            break;
1630
        }
1631

    
1632
        switch (id) {
1633
            /* one single index entry ('point') */
1634
            case MATROSKA_ID_POINTENTRY:
1635
                if ((res = ebml_read_master(matroska, &id)) < 0)
1636
                    break;
1637

    
1638
                /* in the end, we hope to fill one entry with a
1639
                 * timestamp, a file position and a tracknum */
1640
                idx.pos   = (uint64_t) -1;
1641
                idx.time  = (uint64_t) -1;
1642
                idx.track = (uint16_t) -1;
1643

    
1644
                while (res == 0) {
1645
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1646
                        res = AVERROR_IO;
1647
                        break;
1648
                    } else if (matroska->level_up) {
1649
                        matroska->level_up--;
1650
                        break;
1651
                    }
1652

    
1653
                    switch (id) {
1654
                        /* one single index entry ('point') */
1655
                        case MATROSKA_ID_CUETIME: {
1656
                            int64_t time;
1657
                            if ((res = ebml_read_uint(matroska, &id,
1658
                                                      &time)) < 0)
1659
                                break;
1660
                            idx.time = time * matroska->time_scale;
1661
                            break;
1662
                        }
1663

    
1664
                        /* position in the file + track to which it
1665
                         * belongs */
1666
                        case MATROSKA_ID_CUETRACKPOSITION:
1667
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1668
                                break;
1669

    
1670
                            while (res == 0) {
1671
                                if (!(id = ebml_peek_id (matroska,
1672
                                                    &matroska->level_up))) {
1673
                                    res = AVERROR_IO;
1674
                                    break;
1675
                                } else if (matroska->level_up) {
1676
                                    matroska->level_up--;
1677
                                    break;
1678
                                }
1679

    
1680
                                switch (id) {
1681
                                    /* track number */
1682
                                    case MATROSKA_ID_CUETRACK: {
1683
                                        uint64_t num;
1684
                                        if ((res = ebml_read_uint(matroska,
1685
                                                          &id, &num)) < 0)
1686
                                            break;
1687
                                        idx.track = num;
1688
                                        break;
1689
                                    }
1690

    
1691
                                        /* position in file */
1692
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1693
                                        uint64_t num;
1694
                                        if ((res = ebml_read_uint(matroska,
1695
                                                          &id, &num)) < 0)
1696
                                            break;
1697
                                        idx.pos = num;
1698
                                        break;
1699
                                    }
1700

    
1701
                                    default:
1702
                                        av_log(matroska->ctx, AV_LOG_INFO,
1703
                                               "Unknown entry 0x%x in "
1704
                                               "CuesTrackPositions\n", id);
1705
                                        /* fall-through */
1706

    
1707
                                    case EBML_ID_VOID:
1708
                                        res = ebml_read_skip(matroska);
1709
                                        break;
1710
                                }
1711

    
1712
                                if (matroska->level_up) {
1713
                                    matroska->level_up--;
1714
                                    break;
1715
                                }
1716
                            }
1717

    
1718
                            break;
1719

    
1720
                        default:
1721
                            av_log(matroska->ctx, AV_LOG_INFO,
1722
                                   "Unknown entry 0x%x in cuespoint "
1723
                                   "index\n", id);
1724
                            /* fall-through */
1725

    
1726
                        case EBML_ID_VOID:
1727
                            res = ebml_read_skip(matroska);
1728
                            break;
1729
                    }
1730

    
1731
                    if (matroska->level_up) {
1732
                        matroska->level_up--;
1733
                        break;
1734
                    }
1735
                }
1736

    
1737
                /* so let's see if we got what we wanted */
1738
                if (idx.pos   != (uint64_t) -1 &&
1739
                    idx.time  != (uint64_t) -1 &&
1740
                    idx.track != (uint16_t) -1) {
1741
                    if (matroska->num_indexes % 32 == 0) {
1742
                        /* re-allocate bigger index */
1743
                        matroska->index =
1744
                            av_realloc(matroska->index,
1745
                                       (matroska->num_indexes + 32) *
1746
                                       sizeof(MatroskaDemuxIndex));
1747
                    }
1748
                    matroska->index[matroska->num_indexes] = idx;
1749
                    matroska->num_indexes++;
1750
                }
1751
                break;
1752

    
1753
            default:
1754
                av_log(matroska->ctx, AV_LOG_INFO,
1755
                       "Unknown entry 0x%x in cues header\n", id);
1756
                /* fall-through */
1757

    
1758
            case EBML_ID_VOID:
1759
                res = ebml_read_skip(matroska);
1760
                break;
1761
        }
1762

    
1763
        if (matroska->level_up) {
1764
            matroska->level_up--;
1765
            break;
1766
        }
1767
    }
1768

    
1769
    return res;
1770
}
1771

    
1772
static int
1773
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1774
{
1775
    int res = 0;
1776
    uint32_t id;
1777

    
1778
    while (res == 0) {
1779
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1780
            res = AVERROR_IO;
1781
            break;
1782
        } else if (matroska->level_up) {
1783
            matroska->level_up--;
1784
            break;
1785
        }
1786

    
1787
        switch (id) {
1788
            /* Hm, this is unsupported... */
1789
            default:
1790
                av_log(matroska->ctx, AV_LOG_INFO,
1791
                       "Unknown entry 0x%x in metadata header\n", id);
1792
                /* fall-through */
1793

    
1794
            case EBML_ID_VOID:
1795
                res = ebml_read_skip(matroska);
1796
                break;
1797
        }
1798

    
1799
        if (matroska->level_up) {
1800
            matroska->level_up--;
1801
            break;
1802
        }
1803
    }
1804

    
1805
    return res;
1806
}
1807

    
1808
static int
1809
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1810
{
1811
    int res = 0;
1812
    uint32_t id;
1813

    
1814
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1815

    
1816
    while (res == 0) {
1817
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1818
            res = AVERROR_IO;
1819
            break;
1820
        } else if (matroska->level_up) {
1821
            matroska->level_up--;
1822
            break;
1823
        }
1824

    
1825
        switch (id) {
1826
            case MATROSKA_ID_SEEKENTRY: {
1827
                uint32_t seek_id = 0, peek_id_cache = 0;
1828
                uint64_t seek_pos = (uint64_t) -1, t;
1829

    
1830
                if ((res = ebml_read_master(matroska, &id)) < 0)
1831
                    break;
1832

    
1833
                while (res == 0) {
1834
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1835
                        res = AVERROR_IO;
1836
                        break;
1837
                    } else if (matroska->level_up) {
1838
                        matroska->level_up--;
1839
                        break;
1840
                    }
1841

    
1842
                    switch (id) {
1843
                        case MATROSKA_ID_SEEKID:
1844
                            res = ebml_read_uint(matroska, &id, &t);
1845
                            seek_id = t;
1846
                            break;
1847

    
1848
                        case MATROSKA_ID_SEEKPOSITION:
1849
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1850
                            break;
1851

    
1852
                        default:
1853
                            av_log(matroska->ctx, AV_LOG_INFO,
1854
                                   "Unknown seekhead ID 0x%x\n", id);
1855
                            /* fall-through */
1856

    
1857
                        case EBML_ID_VOID:
1858
                            res = ebml_read_skip(matroska);
1859
                            break;
1860
                    }
1861

    
1862
                    if (matroska->level_up) {
1863
                        matroska->level_up--;
1864
                        break;
1865
                    }
1866
                }
1867

    
1868
                if (!seek_id || seek_pos == (uint64_t) -1) {
1869
                    av_log(matroska->ctx, AV_LOG_INFO,
1870
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1871
                           seek_id, seek_pos);
1872
                    break;
1873
                }
1874

    
1875
                switch (seek_id) {
1876
                    case MATROSKA_ID_CUES:
1877
                    case MATROSKA_ID_TAGS: {
1878
                        uint32_t level_up = matroska->level_up;
1879
                        offset_t before_pos;
1880
                        uint64_t length;
1881
                        MatroskaLevel level;
1882

    
1883
                        /* remember the peeked ID and the current position */
1884
                        peek_id_cache = matroska->peek_id;
1885
                        before_pos = url_ftell(&matroska->ctx->pb);
1886

    
1887
                        /* seek */
1888
                        if ((res = ebml_read_seek(matroska, seek_pos +
1889
                                               matroska->segment_start)) < 0)
1890
                            return res;
1891

    
1892
                        /* we don't want to lose our seekhead level, so we add
1893
                         * a dummy. This is a crude hack. */
1894
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1895
                            av_log(matroska->ctx, AV_LOG_INFO,
1896
                                   "Max EBML element depth (%d) reached, "
1897
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1898
                            return AVERROR_UNKNOWN;
1899
                        }
1900

    
1901
                        level.start = 0;
1902
                        level.length = (uint64_t)-1;
1903
                        matroska->levels[matroska->num_levels] = level;
1904
                        matroska->num_levels++;
1905

    
1906
                        /* check ID */
1907
                        if (!(id = ebml_peek_id (matroska,
1908
                                                 &matroska->level_up)))
1909
                            break;
1910
                        if (id != seek_id) {
1911
                            av_log(matroska->ctx, AV_LOG_INFO,
1912
                                   "We looked for ID=0x%x but got "
1913
                                   "ID=0x%x (pos=%"PRIu64")",
1914
                                   seek_id, id, seek_pos +
1915
                                   matroska->segment_start);
1916
                            goto finish;
1917
                        }
1918

    
1919
                        /* read master + parse */
1920
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1921
                            break;
1922
                        switch (id) {
1923
                            case MATROSKA_ID_CUES:
1924
                                if (!(res = matroska_parse_index(matroska)) ||
1925
                                    url_feof(&matroska->ctx->pb)) {
1926
                                    matroska->index_parsed = 1;
1927
                                    res = 0;
1928
                                }
1929
                                break;
1930
                            case MATROSKA_ID_TAGS:
1931
                                if (!(res = matroska_parse_metadata(matroska)) ||
1932
                                   url_feof(&matroska->ctx->pb)) {
1933
                                    matroska->metadata_parsed = 1;
1934
                                    res = 0;
1935
                                }
1936
                                break;
1937
                        }
1938
                        if (res < 0)
1939
                            break;
1940

    
1941
                    finish:
1942
                        /* remove dummy level */
1943
                        while (matroska->num_levels) {
1944
                            matroska->num_levels--;
1945
                            length =
1946
                                matroska->levels[matroska->num_levels].length;
1947
                            if (length == (uint64_t)-1)
1948
                                break;
1949
                        }
1950

    
1951
                        /* seek back */
1952
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1953
                            return res;
1954
                        matroska->peek_id = peek_id_cache;
1955
                        matroska->level_up = level_up;
1956
                        break;
1957
                    }
1958

    
1959
                    default:
1960
                        av_log(matroska->ctx, AV_LOG_INFO,
1961
                               "Ignoring seekhead entry for ID=0x%x\n",
1962
                               seek_id);
1963
                        break;
1964
                }
1965

    
1966
                break;
1967
            }
1968

    
1969
            default:
1970
                av_log(matroska->ctx, AV_LOG_INFO,
1971
                       "Unknown seekhead ID 0x%x\n", id);
1972
                /* fall-through */
1973

    
1974
            case EBML_ID_VOID:
1975
                res = ebml_read_skip(matroska);
1976
                break;
1977
        }
1978

    
1979
        if (matroska->level_up) {
1980
            matroska->level_up--;
1981
            break;
1982
        }
1983
    }
1984

    
1985
    return res;
1986
}
1987

    
1988
static int
1989
matroska_read_header (AVFormatContext    *s,
1990
                      AVFormatParameters *ap)
1991
{
1992
    MatroskaDemuxContext *matroska = s->priv_data;
1993
    char *doctype;
1994
    int version, last_level, res = 0;
1995
    uint32_t id;
1996

    
1997
    matroska->ctx = s;
1998

    
1999
    /* First read the EBML header. */
2000
    doctype = NULL;
2001
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2002
        return res;
2003
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2004
        av_log(matroska->ctx, AV_LOG_ERROR,
2005
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2006
               doctype ? doctype : "(none)");
2007
        if (doctype)
2008
            av_free(doctype);
2009
        return AVERROR_NOFMT;
2010
    }
2011
    av_free(doctype);
2012
    if (version != 1) {
2013
        av_log(matroska->ctx, AV_LOG_ERROR,
2014
               "Matroska demuxer version 1 too old for file version %d\n",
2015
               version);
2016
        return AVERROR_NOFMT;
2017
    }
2018

    
2019
    /* The next thing is a segment. */
2020
    while (1) {
2021
        if (!(id = ebml_peek_id(matroska, &last_level)))
2022
            return AVERROR_IO;
2023
        if (id == MATROSKA_ID_SEGMENT)
2024
            break;
2025

    
2026
        /* oi! */
2027
        av_log(matroska->ctx, AV_LOG_INFO,
2028
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2029
               MATROSKA_ID_SEGMENT, id);
2030
        if ((res = ebml_read_skip(matroska)) < 0)
2031
            return res;
2032
    }
2033

    
2034
    /* We now have a Matroska segment.
2035
     * Seeks are from the beginning of the segment,
2036
     * after the segment ID/length. */
2037
    if ((res = ebml_read_master(matroska, &id)) < 0)
2038
        return res;
2039
    matroska->segment_start = url_ftell(&s->pb);
2040

    
2041
    matroska->time_scale = 1000000;
2042
    /* we've found our segment, start reading the different contents in here */
2043
    while (res == 0) {
2044
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2045
            res = AVERROR_IO;
2046
            break;
2047
        } else if (matroska->level_up) {
2048
            matroska->level_up--;
2049
            break;
2050
        }
2051

    
2052
        switch (id) {
2053
            /* stream info */
2054
            case MATROSKA_ID_INFO: {
2055
                if ((res = ebml_read_master(matroska, &id)) < 0)
2056
                    break;
2057
                res = matroska_parse_info(matroska);
2058
                break;
2059
            }
2060

    
2061
            /* track info headers */
2062
            case MATROSKA_ID_TRACKS: {
2063
                if ((res = ebml_read_master(matroska, &id)) < 0)
2064
                    break;
2065
                res = matroska_parse_tracks(matroska);
2066
                break;
2067
            }
2068

    
2069
            /* stream index */
2070
            case MATROSKA_ID_CUES: {
2071
                if (!matroska->index_parsed) {
2072
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2073
                        break;
2074
                    res = matroska_parse_index(matroska);
2075
                } else
2076
                    res = ebml_read_skip(matroska);
2077
                break;
2078
            }
2079

    
2080
            /* metadata */
2081
            case MATROSKA_ID_TAGS: {
2082
                if (!matroska->metadata_parsed) {
2083
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2084
                        break;
2085
                    res = matroska_parse_metadata(matroska);
2086
                } else
2087
                    res = ebml_read_skip(matroska);
2088
                break;
2089
            }
2090

    
2091
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2092
            case MATROSKA_ID_SEEKHEAD: {
2093
                if ((res = ebml_read_master(matroska, &id)) < 0)
2094
                    break;
2095
                res = matroska_parse_seekhead(matroska);
2096
                break;
2097
            }
2098

    
2099
            case MATROSKA_ID_CLUSTER: {
2100
                /* Do not read the master - this will be done in the next
2101
                 * call to matroska_read_packet. */
2102
                res = 1;
2103
                break;
2104
            }
2105

    
2106
            default:
2107
                av_log(matroska->ctx, AV_LOG_INFO,
2108
                       "Unknown matroska file header ID 0x%x\n", id);
2109
            /* fall-through */
2110

    
2111
            case EBML_ID_VOID:
2112
                res = ebml_read_skip(matroska);
2113
                break;
2114
        }
2115

    
2116
        if (matroska->level_up) {
2117
            matroska->level_up--;
2118
            break;
2119
        }
2120
    }
2121

    
2122
    if (res < 0)
2123
        return res;
2124

    
2125
    /* Have we found a cluster? */
2126
    if (res == 1) {
2127
        int i;
2128
        enum CodecID codec_id;
2129
        MatroskaTrack *track;
2130
        AVStream *st;
2131
        void *extradata = NULL;
2132
        int extradata_size = 0;
2133

    
2134
        for (i = 0; i < matroska->num_tracks; i++) {
2135
            track = matroska->tracks[i];
2136

    
2137
            /* libavformat does not really support subtitles.
2138
             * Also apply some sanity checks. */
2139
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2140
                (track->codec_id == NULL))
2141
                continue;
2142

    
2143
            /* Set the FourCC from the CodecID. */
2144
            /* This is the MS compatibility mode which stores a
2145
             * BITMAPINFOHEADER in the CodecPrivate. */
2146
            if (!strcmp(track->codec_id,
2147
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2148
                (track->codec_priv_size >= 40) &&
2149
                (track->codec_priv != NULL)) {
2150
                unsigned char *p;
2151

    
2152
                /* Offset of biCompression. Stored in LE. */
2153
                p = (unsigned char *)track->codec_priv + 16;
2154
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2155
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2156
                codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
2157

    
2158
            } else if (!strcmp(track->codec_id,
2159
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
2160
                       !strcmp(track->codec_id,
2161
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
2162
                       !strcmp(track->codec_id,
2163
                               MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
2164
                codec_id = CODEC_ID_MPEG4;
2165
            else if (!strcmp(track->codec_id,
2166
                             MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC))
2167
                codec_id = CODEC_ID_H264;
2168
/*             else if (!strcmp(track->codec_id, */
2169
/*                              MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
2170
/*                 codec_id = CODEC_ID_???; */
2171
            else if (!strcmp(track->codec_id,
2172
                             MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
2173
                codec_id = CODEC_ID_MSMPEG4V3;
2174
            else if (!strcmp(track->codec_id,
2175
                             MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
2176
                     !strcmp(track->codec_id,
2177
                             MATROSKA_CODEC_ID_VIDEO_MPEG2))
2178
                codec_id = CODEC_ID_MPEG2VIDEO;
2179

    
2180
            /* This is the MS compatibility mode which stores a
2181
             * WAVEFORMATEX in the CodecPrivate. */
2182
            else if (!strcmp(track->codec_id,
2183
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2184
                (track->codec_priv_size >= 18) &&
2185
                (track->codec_priv != NULL)) {
2186
                unsigned char *p;
2187
                uint16_t tag;
2188

    
2189
                /* Offset of wFormatTag. Stored in LE. */
2190
                p = (unsigned char *)track->codec_priv;
2191
                tag = (p[1] << 8) | p[0];
2192
                codec_id = codec_get_wav_id(tag);
2193

    
2194
            } else if (!strcmp(track->codec_id,
2195
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
2196
                       !strcmp(track->codec_id,
2197
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
2198
                       !strcmp(track->codec_id,
2199
                               MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
2200
                codec_id = CODEC_ID_MP3;
2201
            else if (!strcmp(track->codec_id,
2202
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
2203
                codec_id = CODEC_ID_PCM_U16BE;
2204
            else if (!strcmp(track->codec_id,
2205
                             MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
2206
                codec_id = CODEC_ID_PCM_U16LE;
2207
/*             else if (!strcmp(track->codec_id, */
2208
/*                              MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
2209
/*                 codec_id = CODEC_ID_PCM_???; */
2210
            else if (!strcmp(track->codec_id,
2211
                             MATROSKA_CODEC_ID_AUDIO_AC3))
2212
                codec_id = CODEC_ID_AC3;
2213
            else if (!strcmp(track->codec_id,
2214
                             MATROSKA_CODEC_ID_AUDIO_DTS))
2215
                codec_id = CODEC_ID_DTS;
2216
            /* No such codec id so far. */
2217
/*             else if (!strcmp(track->codec_id, */
2218
/*                              MATROSKA_CODEC_ID_AUDIO_DTS)) */
2219
/*                 codec_id = CODEC_ID_DTS; */
2220
            else if (!strcmp(track->codec_id,
2221
                             MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
2222
                extradata_size = track->codec_priv_size;
2223
                if(extradata_size) {
2224
                    extradata = av_malloc(extradata_size);
2225
                    if(extradata == NULL)
2226
                        return AVERROR_NOMEM;
2227
                    memcpy(extradata, track->codec_priv, extradata_size);
2228
                }
2229
                codec_id = CODEC_ID_VORBIS;
2230
            } else if (!strcmp(track->codec_id,
2231
                               MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
2232
                       !strcmp(track->codec_id,
2233
                               MATROSKA_CODEC_ID_AUDIO_MPEG4))
2234
                codec_id = CODEC_ID_AAC;
2235
            else
2236
                codec_id = CODEC_ID_NONE;
2237

    
2238
            if (codec_id == CODEC_ID_NONE) {
2239
                av_log(matroska->ctx, AV_LOG_INFO,
2240
                       "Unknown/unsupported CodecID %s.\n",
2241
                       track->codec_id);
2242
            }
2243

    
2244
            track->stream_index = matroska->num_streams;
2245

    
2246
            matroska->num_streams++;
2247
            st = av_new_stream(s, track->stream_index);
2248
            if (st == NULL)
2249
                return AVERROR_NOMEM;
2250
            av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
2251

    
2252
            st->codec->codec_id = codec_id;
2253

    
2254
            if(extradata){
2255
                st->codec->extradata = extradata;
2256
                st->codec->extradata_size = extradata_size;
2257
            } else if(track->codec_priv && track->codec_priv_size > 0){
2258
                st->codec->extradata = av_malloc(track->codec_priv_size);
2259
                if(st->codec->extradata == NULL)
2260
                    return AVERROR_NOMEM;
2261
                st->codec->extradata_size = track->codec_priv_size;
2262
                memcpy(st->codec->extradata, track->codec_priv,
2263
                       track->codec_priv_size);
2264
            }
2265

    
2266
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2267
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2268

    
2269
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2270
                st->codec->codec_tag = videotrack->fourcc;
2271
                st->codec->width = videotrack->pixel_width;
2272
                st->codec->height = videotrack->pixel_height;
2273
                if (videotrack->display_width == 0)
2274
                    st->codec->sample_aspect_ratio.num =
2275
                        videotrack->pixel_width;
2276
                else
2277
                    st->codec->sample_aspect_ratio.num =
2278
                        videotrack->display_width;
2279
                if (videotrack->display_height == 0)
2280
                    st->codec->sample_aspect_ratio.num =
2281
                        videotrack->pixel_height;
2282
                else
2283
                    st->codec->sample_aspect_ratio.num =
2284
                        videotrack->display_height;
2285

    
2286
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2287
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2288

    
2289
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2290
                st->codec->sample_rate = audiotrack->samplerate;
2291
                st->codec->channels = audiotrack->channels;
2292
            }
2293

    
2294
            /* What do we do with private data? E.g. for Vorbis. */
2295
        }
2296
    }
2297

    
2298
    return 0;
2299
}
2300

    
2301
static int
2302
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2303
                            int                   num)
2304
{
2305
    int i;
2306

    
2307
    for (i = 0; i < matroska->num_tracks; i++)
2308
        if (matroska->tracks[i]->num == num)
2309
            return i;
2310

    
2311
    return -1;
2312
}
2313

    
2314
static int
2315
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2316
                           uint64_t              cluster_time)
2317
{
2318
    int res = 0;
2319
    uint32_t id;
2320
    AVPacket *pkt;
2321
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2322

    
2323
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2324

    
2325
    while (res == 0) {
2326
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2327
            res = AVERROR_IO;
2328
            break;
2329
        } else if (matroska->level_up) {
2330
            matroska->level_up--;
2331
            break;
2332
        }
2333

    
2334
        switch (id) {
2335
            /* one block inside the group. Note, block parsing is one
2336
             * of the harder things, so this code is a bit complicated.
2337
             * See http://www.matroska.org/ for documentation. */
2338
            case MATROSKA_ID_BLOCK: {
2339
                uint8_t *data, *origdata;
2340
                int size;
2341
                uint64_t time;
2342
                uint32_t *lace_size = NULL;
2343
                int n, track, flags, laces = 0;
2344
                uint64_t num;
2345
                int64_t pos= url_ftell(&matroska->ctx->pb);
2346

    
2347
                if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2348
                    break;
2349
                origdata = data;
2350

    
2351
                /* first byte(s): blocknum */
2352
                if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2353
                    av_log(matroska->ctx, AV_LOG_ERROR,
2354
                           "EBML block data error\n");
2355
                    av_free(origdata);
2356
                    break;
2357
                }
2358
                data += n;
2359
                size -= n;
2360

    
2361
                /* fetch track from num */
2362
                track = matroska_find_track_by_num(matroska, num);
2363
                if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2364
                    av_log(matroska->ctx, AV_LOG_INFO,
2365
                           "Invalid stream %d or size %u\n", track, size);
2366
                    av_free(origdata);
2367
                    break;
2368
                }
2369
                if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2370
                    av_free(origdata);
2371
                    break;
2372
                }
2373

    
2374
                /* time (relative to cluster time) */
2375
                time = ((data[0] << 8) | data[1]) * matroska->time_scale;
2376
                data += 2;
2377
                size -= 2;
2378
                flags = *data;
2379
                data += 1;
2380
                size -= 1;
2381
                switch ((flags & 0x06) >> 1) {
2382
                    case 0x0: /* no lacing */
2383
                        laces = 1;
2384
                        lace_size = av_mallocz(sizeof(int));
2385
                        lace_size[0] = size;
2386
                        break;
2387

    
2388
                    case 0x1: /* xiph lacing */
2389
                    case 0x2: /* fixed-size lacing */
2390
                    case 0x3: /* EBML lacing */
2391
                        if (size == 0) {
2392
                            res = -1;
2393
                            break;
2394
                        }
2395
                        laces = (*data) + 1;
2396
                        data += 1;
2397
                        size -= 1;
2398
                        lace_size = av_mallocz(laces * sizeof(int));
2399

    
2400
                        switch ((flags & 0x06) >> 1) {
2401
                            case 0x1: /* xiph lacing */ {
2402
                                uint8_t temp;
2403
                                uint32_t total = 0;
2404
                                for (n = 0; res == 0 && n < laces - 1; n++) {
2405
                                    while (1) {
2406
                                        if (size == 0) {
2407
                                            res = -1;
2408
                                            break;
2409
                                        }
2410
                                        temp = *data;
2411
                                        lace_size[n] += temp;
2412
                                        data += 1;
2413
                                        size -= 1;
2414
                                        if (temp != 0xff)
2415
                                            break;
2416
                                    }
2417
                                    total += lace_size[n];
2418
                                }
2419
                                lace_size[n] = size - total;
2420
                                break;
2421
                            }
2422

    
2423
                            case 0x2: /* fixed-size lacing */
2424
                                for (n = 0; n < laces; n++)
2425
                                    lace_size[n] = size / laces;
2426
                                break;
2427

    
2428
                            case 0x3: /* EBML lacing */ {
2429
                                uint32_t total;
2430
                                n = matroska_ebmlnum_uint(data, size, &num);
2431
                                if (n < 0) {
2432
                                    av_log(matroska->ctx, AV_LOG_INFO,
2433
                                           "EBML block data error\n");
2434
                                    break;
2435
                                }
2436
                                data += n;
2437
                                size -= n;
2438
                                total = lace_size[0] = num;
2439
                                for (n = 1; res == 0 && n < laces - 1; n++) {
2440
                                    int64_t snum;
2441
                                    int r;
2442
                                    r = matroska_ebmlnum_sint (data, size,
2443
                                                               &snum);
2444
                                    if (r < 0) {
2445
                                        av_log(matroska->ctx, AV_LOG_INFO,
2446
                                               "EBML block data error\n");
2447
                                        break;
2448
                                    }
2449
                                    data += r;
2450
                                    size -= r;
2451
                                    lace_size[n] = lace_size[n - 1] + snum;
2452
                                    total += lace_size[n];
2453
                                }
2454
                                lace_size[n] = size - total;
2455
                                break;
2456
                            }
2457
                        }
2458
                        break;
2459
                }
2460

    
2461
                if (res == 0) {
2462
                    for (n = 0; n < laces; n++) {
2463
                        uint64_t timecode = 0;
2464

    
2465
                        pkt = av_mallocz(sizeof(AVPacket));
2466
                        /* XXX: prevent data copy... */
2467
                        if (av_new_packet(pkt,lace_size[n]) < 0) {
2468
                            res = AVERROR_NOMEM;
2469
                            break;
2470
                        }
2471
                        if (cluster_time != (uint64_t)-1) {
2472
                            if (time < 0 && (-time) > cluster_time)
2473
                                timecode = cluster_time;
2474
                            else
2475
                                timecode = cluster_time + time;
2476
                        }
2477
                        /* FIXME: duration */
2478

    
2479
                        memcpy(pkt->data, data, lace_size[n]);
2480
                        data += lace_size[n];
2481
                        if (n == 0)
2482
                            pkt->flags = is_keyframe;
2483
                        pkt->stream_index =
2484
                            matroska->tracks[track]->stream_index;
2485

    
2486
                        pkt->pts = timecode / 1000000; /* ns to ms */
2487
                        pkt->pos= pos;
2488

    
2489
                        matroska_queue_packet(matroska, pkt);
2490
                    }
2491
                }
2492

    
2493
                av_free(lace_size);
2494
                av_free(origdata);
2495
                break;
2496
            }
2497

    
2498
            case MATROSKA_ID_BLOCKDURATION: {
2499
                uint64_t num;
2500
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2501
                    break;
2502
                av_log(matroska->ctx, AV_LOG_INFO,
2503
                       "FIXME: implement support for BlockDuration\n");
2504
                break;
2505
            }
2506

    
2507
            case MATROSKA_ID_BLOCKREFERENCE:
2508
                /* We've found a reference, so not even the first frame in
2509
                 * the lace is a key frame. */
2510
                is_keyframe = 0;
2511
                if (last_num_packets != matroska->num_packets)
2512
                    matroska->packets[last_num_packets]->flags = 0;
2513
                res = ebml_read_skip(matroska);
2514
                break;
2515

    
2516
            default:
2517
                av_log(matroska->ctx, AV_LOG_INFO,
2518
                       "Unknown entry 0x%x in blockgroup data\n", id);
2519
                /* fall-through */
2520

    
2521
            case EBML_ID_VOID:
2522
                res = ebml_read_skip(matroska);
2523
                break;
2524
        }
2525

    
2526
        if (matroska->level_up) {
2527
            matroska->level_up--;
2528
            break;
2529
        }
2530
    }
2531

    
2532
    return res;
2533
}
2534

    
2535
static int
2536
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2537
{
2538
    int res = 0;
2539
    uint32_t id;
2540
    uint64_t cluster_time = 0;
2541

    
2542
    av_log(matroska->ctx, AV_LOG_DEBUG,
2543
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2544

    
2545
    while (res == 0) {
2546
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2547
            res = AVERROR_IO;
2548
            break;
2549
        } else if (matroska->level_up) {
2550
            matroska->level_up--;
2551
            break;
2552
        }
2553

    
2554
        switch (id) {
2555
            /* cluster timecode */
2556
            case MATROSKA_ID_CLUSTERTIMECODE: {
2557
                uint64_t num;
2558
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2559
                    break;
2560
                cluster_time = num * matroska->time_scale;
2561
                break;
2562
            }
2563

    
2564
                /* a group of blocks inside a cluster */
2565
            case MATROSKA_ID_BLOCKGROUP:
2566
                if ((res = ebml_read_master(matroska, &id)) < 0)
2567
                    break;
2568
                res = matroska_parse_blockgroup(matroska, cluster_time);
2569
                break;
2570

    
2571
            default:
2572
                av_log(matroska->ctx, AV_LOG_INFO,
2573
                       "Unknown entry 0x%x in cluster data\n", id);
2574
                /* fall-through */
2575

    
2576
            case EBML_ID_VOID:
2577
                res = ebml_read_skip(matroska);
2578
                break;
2579
        }
2580

    
2581
        if (matroska->level_up) {
2582
            matroska->level_up--;
2583
            break;
2584
        }
2585
    }
2586

    
2587
    return res;
2588
}
2589

    
2590
static int
2591
matroska_read_packet (AVFormatContext *s,
2592
                      AVPacket        *pkt)
2593
{
2594
    MatroskaDemuxContext *matroska = s->priv_data;
2595
    int res = 0;
2596
    uint32_t id;
2597

    
2598
    /* Do we still have a packet queued? */
2599
    if (matroska_deliver_packet(matroska, pkt) == 0)
2600
        return 0;
2601

    
2602
    /* Have we already reached the end? */
2603
    if (matroska->done)
2604
        return AVERROR_IO;
2605

    
2606
    while (res == 0) {
2607
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2608
            res = AVERROR_IO;
2609
            break;
2610
        } else if (matroska->level_up) {
2611
            matroska->level_up--;
2612
            break;
2613
        }
2614

    
2615
        switch (id) {
2616
            case MATROSKA_ID_CLUSTER:
2617
                if ((res = ebml_read_master(matroska, &id)) < 0)
2618
                    break;
2619
                if ((res = matroska_parse_cluster(matroska)) == 0)
2620
                    res = 1; /* Parsed one cluster, let's get out. */
2621
                break;
2622

    
2623
            default:
2624
            case EBML_ID_VOID:
2625
                res = ebml_read_skip(matroska);
2626
                break;
2627
        }
2628

    
2629
        if (matroska->level_up) {
2630
            matroska->level_up--;
2631
            break;
2632
        }
2633
    }
2634

    
2635
    if (res == -1)
2636
        matroska->done = 1;
2637

    
2638
    return matroska_deliver_packet(matroska, pkt);
2639
}
2640

    
2641
static int
2642
matroska_read_close (AVFormatContext *s)
2643
{
2644
    MatroskaDemuxContext *matroska = s->priv_data;
2645
    int n = 0;
2646

    
2647
    if (matroska->writing_app)
2648
        av_free(matroska->writing_app);
2649
    if (matroska->muxing_app)
2650
        av_free(matroska->muxing_app);
2651
    if (matroska->index)
2652
        av_free(matroska->index);
2653

    
2654
    if (matroska->packets != NULL) {
2655
        for (n = 0; n < matroska->num_packets; n++) {
2656
            av_free_packet(matroska->packets[n]);
2657
            av_free(matroska->packets[n]);
2658
        }
2659
        av_free(matroska->packets);
2660
    }
2661

    
2662
    for (n = 0; n < matroska->num_tracks; n++) {
2663
        MatroskaTrack *track = matroska->tracks[n];
2664
        if (track->codec_id)
2665
            av_free(track->codec_id);
2666
        if (track->codec_name)
2667
            av_free(track->codec_name);
2668
        if (track->codec_priv)
2669
            av_free(track->codec_priv);
2670
        if (track->name)
2671
            av_free(track->name);
2672
        if (track->language)
2673
            av_free(track->language);
2674

    
2675
        av_free(track);
2676
    }
2677

    
2678
    for (n = 0; n < s->nb_streams; n++) {
2679
        av_free(s->streams[n]->codec->extradata);
2680
    }
2681

    
2682
    memset(matroska, 0, sizeof(MatroskaDemuxContext));
2683

    
2684
    return 0;
2685
}
2686

    
2687
static AVInputFormat matroska_iformat = {
2688
    "matroska",
2689
    "Matroska file format",
2690
    sizeof(MatroskaDemuxContext),
2691
    matroska_probe,
2692
    matroska_read_header,
2693
    matroska_read_packet,
2694
    matroska_read_close,
2695
};
2696

    
2697
int
2698
matroska_init(void)
2699
{
2700
    av_register_input_format(&matroska_iformat);
2701
    return 0;
2702
}