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/*
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 * Matroska file demuxer (no muxer yet)
3
 * Copyright (c) 2003-2004 The ffmpeg Project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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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 FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
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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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 */
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#include "avformat.h"
32
/* For codec_get_id(). */
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#include "riff.h"
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#include "intfloat_readwrite.h"
35

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

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

    
42
/* IDs in the HEADER master */
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#define EBML_ID_EBMLVERSION        0x4286
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#define EBML_ID_EBMLREADVERSION    0x42F7
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#define EBML_ID_EBMLMAXIDLENGTH    0x42F2
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#define EBML_ID_EBMLMAXSIZELENGTH  0x42F3
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#define EBML_ID_DOCTYPE            0x4282
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#define EBML_ID_DOCTYPEVERSION     0x4287
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#define EBML_ID_DOCTYPEREADVERSION 0x4285
50

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

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

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

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

    
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/* 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_TITLE      0x7BA9
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#define MATROSKA_ID_WRITINGAPP 0x5741
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#define MATROSKA_ID_MUXINGAPP  0x4D80
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#define MATROSKA_ID_DATEUTC    0x4461
76

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

    
80
/* IDs in the trackentry master */
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#define MATROSKA_ID_TRACKNUMBER 0xD7
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#define MATROSKA_ID_TRACKUID   0x73C5
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#define MATROSKA_ID_TRACKTYPE  0x83
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#define MATROSKA_ID_TRACKAUDIO 0xE1
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#define MATROSKA_ID_TRACKVIDEO 0xE0
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#define MATROSKA_ID_CODECID    0x86
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#define MATROSKA_ID_CODECPRIVATE 0x63A2
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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
95
#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
99

    
100
/* IDs in the trackvideo master */
101
#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
102
#define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0
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#define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA
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#define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0
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#define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA
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#define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A
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#define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9
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#define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3
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#define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524
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/* IDs in the trackaudio master */
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#define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5
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#define MATROSKA_ID_AUDIOOUTSAMPLINGFREQ 0x78B5
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#define MATROSKA_ID_AUDIOBITDEPTH 0x6264
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#define MATROSKA_ID_AUDIOCHANNELS 0x9F
117

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

    
121
/* IDs in the pointentry master */
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#define MATROSKA_ID_CUETIME    0xB3
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#define MATROSKA_ID_CUETRACKPOSITION 0xB7
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125
/* IDs in the cuetrackposition master */
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#define MATROSKA_ID_CUETRACK   0xF7
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#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
128

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

    
132
/* IDs in the seekhead master */
133
#define MATROSKA_ID_SEEKENTRY  0x4DBB
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135
/* IDs in the seekpoint master */
136
#define MATROSKA_ID_SEEKID     0x53AB
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#define MATROSKA_ID_SEEKPOSITION 0x53AC
138

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

    
144
/* IDs in the blockgroup master */
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#define MATROSKA_ID_BLOCK      0xA1
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#define MATROSKA_ID_BLOCKDURATION 0x9B
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#define MATROSKA_ID_BLOCKREFERENCE 0xFB
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149
typedef enum {
150
  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,
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} MatroskaTrackType;
157

    
158
typedef enum {
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  MATROSKA_EYE_MODE_MONO  = 0x0,
160
  MATROSKA_EYE_MODE_RIGHT = 0x1,
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  MATROSKA_EYE_MODE_LEFT  = 0x2,
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  MATROSKA_EYE_MODE_BOTH  = 0x3,
163
} MatroskaEyeMode;
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165
typedef enum {
166
  MATROSKA_ASPECT_RATIO_MODE_FREE  = 0x0,
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  MATROSKA_ASPECT_RATIO_MODE_KEEP  = 0x1,
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  MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2,
169
} MatroskaAspectRatioMode;
170

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

    
176
typedef enum {
177
  MATROSKA_TRACK_ENABLED = (1<<0),
178
  MATROSKA_TRACK_DEFAULT = (1<<1),
179
  MATROSKA_TRACK_LACING  = (1<<2),
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  MATROSKA_TRACK_REAL_V  = (1<<4),
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  MATROSKA_TRACK_SHIFT   = (1<<16)
182
} MatroskaTrackFlags;
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184
typedef enum {
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  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
186
} MatroskaVideoTrackFlags;
187

    
188
/*
189
 * Matroska Codec IDs. Strings.
190
 */
191

    
192
typedef struct CodecTags{
193
    const char *str;
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    enum CodecID id;
195
}CodecTags;
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197
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
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#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
199

    
200
static CodecTags codec_tags[]={
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//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
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    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
203
    {"V_MPEG4/ISO/SP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/ASP"  , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AP"   , CODEC_ID_MPEG4},
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    {"V_MPEG4/ISO/AVC"  , CODEC_ID_H264},
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    {"V_MPEG4/MS/V3"    , CODEC_ID_MSMPEG4V3},
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    {"V_MPEG1"          , CODEC_ID_MPEG1VIDEO},
209
    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
210
    {"V_MJPEG"          , CODEC_ID_MJPEG},
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    {"V_REAL/RV10"      , CODEC_ID_RV10},
212
    {"V_REAL/RV20"      , CODEC_ID_RV20},
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    {"V_REAL/RV30"      , CODEC_ID_RV30},
214
    {"V_REAL/RV40"      , CODEC_ID_RV40},
215
    {"V_THEORA"         , CODEC_ID_THEORA},
216
/* TODO: Real/Quicktime */
217

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

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

    
239
typedef struct Track {
240
    MatroskaTrackType type;
241

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

    
248
    char *name,
249
        *language;
250

    
251
    char *codec_id,
252
        *codec_name;
253

    
254
    unsigned char *codec_priv;
255
    int codec_priv_size;
256

    
257
    uint64_t default_duration;
258
    MatroskaTrackFlags flags;
259
} MatroskaTrack;
260

    
261
typedef struct MatroskaVideoTrack {
262
    MatroskaTrack track;
263

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

    
269
    uint32_t fourcc;
270

    
271
    MatroskaAspectRatioMode ar_mode;
272
    MatroskaEyeMode eye_mode;
273

    
274
    //..
275
} MatroskaVideoTrack;
276

    
277
typedef struct MatroskaAudioTrack {
278
    MatroskaTrack track;
279

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

    
287
typedef struct MatroskaSubtitleTrack {
288
    MatroskaTrack track;
289

    
290
    //..
291
} MatroskaSubtitleTrack;
292

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

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

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

    
307
typedef struct MatroskaDemuxContext {
308
    AVFormatContext *ctx;
309

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

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

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

    
323
    /* num_streams is the number of streams that av_new_stream() was called
324
     * for ( = that are available to the calling program). */
325
    int num_tracks, num_streams;
326
    MatroskaTrack *tracks[MAX_STREAMS];
327

    
328
    /* cache for ID peeking */
329
    uint32_t peek_id;
330

    
331
    /* byte position of the segment inside the stream */
332
    offset_t segment_start;
333

    
334
    /* The packet queue. */
335
    AVPacket **packets;
336
    int num_packets;
337

    
338
    /* have we already parse metadata/cues/clusters? */
339
    int metadata_parsed,
340
        index_parsed,
341
        done;
342

    
343
    /* The index for seeking. */
344
    int num_indexes;
345
    MatroskaDemuxIndex *index;
346
} MatroskaDemuxContext;
347

    
348
/*
349
 * The first few functions handle EBML file parsing. The rest
350
 * is the document interpretation. Matroska really just is a
351
 * EBML file.
352
 */
353

    
354
/*
355
 * Return: the amount of levels in the hierarchy that the
356
 * current element lies higher than the previous one.
357
 * The opposite isn't done - that's auto-done using master
358
 * element reading.
359
 */
360

    
361
static int
362
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
363
{
364
    ByteIOContext *pb = &matroska->ctx->pb;
365
    offset_t pos = url_ftell(pb);
366
    int num = 0;
367

    
368
    while (matroska->num_levels > 0) {
369
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
370

    
371
        if (pos >= level->start + level->length) {
372
            matroska->num_levels--;
373
            num++;
374
        } else {
375
            break;
376
        }
377
    }
378

    
379
    return num;
380
}
381

    
382
/*
383
 * Read: an "EBML number", which is defined as a variable-length
384
 * array of bytes. The first byte indicates the length by giving a
385
 * number of 0-bits followed by a one. The position of the first
386
 * "one" bit inside the first byte indicates the length of this
387
 * number.
388
 * Returns: num. of bytes read. < 0 on error.
389
 */
390

    
391
static int
392
ebml_read_num (MatroskaDemuxContext *matroska,
393
               int                   max_size,
394
               uint64_t             *number)
395
{
396
    ByteIOContext *pb = &matroska->ctx->pb;
397
    int len_mask = 0x80, read = 1, n = 1;
398
    int64_t total = 0;
399

    
400
    /* the first byte tells us the length in bytes - get_byte() can normally
401
     * return 0, but since that's not a valid first ebmlID byte, we can
402
     * use it safely here to catch EOS. */
403
    if (!(total = get_byte(pb))) {
404
        /* we might encounter EOS here */
405
        if (!url_feof(pb)) {
406
            offset_t pos = url_ftell(pb);
407
            av_log(matroska->ctx, AV_LOG_ERROR,
408
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
409
                   pos, pos);
410
        }
411
        return AVERROR_IO; /* EOS or actual I/O error */
412
    }
413

    
414
    /* get the length of the EBML number */
415
    while (read <= max_size && !(total & len_mask)) {
416
        read++;
417
        len_mask >>= 1;
418
    }
419
    if (read > max_size) {
420
        offset_t pos = url_ftell(pb) - 1;
421
        av_log(matroska->ctx, AV_LOG_ERROR,
422
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
423
               (uint8_t) total, pos, pos);
424
        return AVERROR_INVALIDDATA;
425
    }
426

    
427
    /* read out length */
428
    total &= ~len_mask;
429
    while (n++ < read)
430
        total = (total << 8) | get_byte(pb);
431

    
432
    *number = total;
433

    
434
    return read;
435
}
436

    
437
/*
438
 * Read: the element content data ID.
439
 * Return: the number of bytes read or < 0 on error.
440
 */
441

    
442
static int
443
ebml_read_element_id (MatroskaDemuxContext *matroska,
444
                      uint32_t             *id,
445
                      int                  *level_up)
446
{
447
    int read;
448
    uint64_t total;
449

    
450
    /* if we re-call this, use our cached ID */
451
    if (matroska->peek_id != 0) {
452
        if (level_up)
453
            *level_up = 0;
454
        *id = matroska->peek_id;
455
        return 0;
456
    }
457

    
458
    /* read out the "EBML number", include tag in ID */
459
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
460
        return read;
461
    *id = matroska->peek_id  = total | (1 << (read * 7));
462

    
463
    /* level tracking */
464
    if (level_up)
465
        *level_up = ebml_read_element_level_up(matroska);
466

    
467
    return read;
468
}
469

    
470
/*
471
 * Read: element content length.
472
 * Return: the number of bytes read or < 0 on error.
473
 */
474

    
475
static int
476
ebml_read_element_length (MatroskaDemuxContext *matroska,
477
                          uint64_t             *length)
478
{
479
    /* clear cache since we're now beyond that data point */
480
    matroska->peek_id = 0;
481

    
482
    /* read out the "EBML number", include tag in ID */
483
    return ebml_read_num(matroska, 8, length);
484
}
485

    
486
/*
487
 * Return: the ID of the next element, or 0 on error.
488
 * Level_up contains the amount of levels that this
489
 * next element lies higher than the previous one.
490
 */
491

    
492
static uint32_t
493
ebml_peek_id (MatroskaDemuxContext *matroska,
494
              int                  *level_up)
495
{
496
    uint32_t id;
497

    
498
    assert(level_up != NULL);
499

    
500
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
501
        return 0;
502

    
503
    return id;
504
}
505

    
506
/*
507
 * Seek to a given offset.
508
 * 0 is success, -1 is failure.
509
 */
510

    
511
static int
512
ebml_read_seek (MatroskaDemuxContext *matroska,
513
                offset_t              offset)
514
{
515
    ByteIOContext *pb = &matroska->ctx->pb;
516

    
517
    /* clear ID cache, if any */
518
    matroska->peek_id = 0;
519

    
520
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
521
}
522

    
523
/*
524
 * Skip the next element.
525
 * 0 is success, -1 is failure.
526
 */
527

    
528
static int
529
ebml_read_skip (MatroskaDemuxContext *matroska)
530
{
531
    ByteIOContext *pb = &matroska->ctx->pb;
532
    uint32_t id;
533
    uint64_t length;
534
    int res;
535

    
536
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
537
        (res = ebml_read_element_length(matroska, &length)) < 0)
538
        return res;
539

    
540
    url_fskip(pb, length);
541

    
542
    return 0;
543
}
544

    
545
/*
546
 * Read the next element as an unsigned int.
547
 * 0 is success, < 0 is failure.
548
 */
549

    
550
static int
551
ebml_read_uint (MatroskaDemuxContext *matroska,
552
                uint32_t             *id,
553
                uint64_t             *num)
554
{
555
    ByteIOContext *pb = &matroska->ctx->pb;
556
    int n = 0, size, res;
557
    uint64_t rlength;
558

    
559
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
560
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
561
        return res;
562
    size = rlength;
563
    if (size < 1 || size > 8) {
564
        offset_t pos = url_ftell(pb);
565
        av_log(matroska->ctx, AV_LOG_ERROR,
566
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
567
                size, pos, pos);
568
        return AVERROR_INVALIDDATA;
569
    }
570

    
571
    /* big-endian ordening; build up number */
572
    *num = 0;
573
    while (n++ < size)
574
        *num = (*num << 8) | get_byte(pb);
575

    
576
    return 0;
577
}
578

    
579
/*
580
 * Read the next element as a signed int.
581
 * 0 is success, < 0 is failure.
582
 */
583

    
584
static int
585
ebml_read_sint (MatroskaDemuxContext *matroska,
586
                uint32_t             *id,
587
                int64_t              *num)
588
{
589
    ByteIOContext *pb = &matroska->ctx->pb;
590
    int size, n = 1, negative = 0, res;
591
    uint64_t rlength;
592

    
593
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
594
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
595
        return res;
596
    size = rlength;
597
    if (size < 1 || size > 8) {
598
        offset_t pos = url_ftell(pb);
599
        av_log(matroska->ctx, AV_LOG_ERROR,
600
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
601
                size, pos, pos);
602
        return AVERROR_INVALIDDATA;
603
    }
604
    if ((*num = get_byte(pb)) & 0x80) {
605
        negative = 1;
606
        *num &= ~0x80;
607
    }
608
    while (n++ < size)
609
        *num = (*num << 8) | get_byte(pb);
610

    
611
    /* make signed */
612
    if (negative)
613
        *num = *num - (1LL << ((8 * size) - 1));
614

    
615
    return 0;
616
}
617

    
618
/*
619
 * Read the next element as a float.
620
 * 0 is success, < 0 is failure.
621
 */
622

    
623
static int
624
ebml_read_float (MatroskaDemuxContext *matroska,
625
                 uint32_t             *id,
626
                 double               *num)
627
{
628
    ByteIOContext *pb = &matroska->ctx->pb;
629
    int size, res;
630
    uint64_t rlength;
631

    
632
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
633
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
634
        return res;
635
    size = rlength;
636

    
637
    if (size == 4) {
638
        *num= av_int2flt(get_be32(pb));
639
    } else if(size==8){
640
        *num= av_int2dbl(get_be64(pb));
641
    } else{
642
        offset_t pos = url_ftell(pb);
643
        av_log(matroska->ctx, AV_LOG_ERROR,
644
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
645
               size, pos, pos);
646
        return AVERROR_INVALIDDATA;
647
    }
648

    
649
    return 0;
650
}
651

    
652
/*
653
 * Read the next element as an ASCII string.
654
 * 0 is success, < 0 is failure.
655
 */
656

    
657
static int
658
ebml_read_ascii (MatroskaDemuxContext *matroska,
659
                 uint32_t             *id,
660
                 char                **str)
661
{
662
    ByteIOContext *pb = &matroska->ctx->pb;
663
    int size, res;
664
    uint64_t rlength;
665

    
666
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
667
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
668
        return res;
669
    size = rlength;
670

    
671
    /* ebml strings are usually not 0-terminated, so we allocate one
672
     * byte more, read the string and NULL-terminate it ourselves. */
673
    if (size < 0 || !(*str = av_malloc(size + 1))) {
674
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
675
        return AVERROR_NOMEM;
676
    }
677
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
678
        offset_t pos = url_ftell(pb);
679
        av_log(matroska->ctx, AV_LOG_ERROR,
680
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
681
        return AVERROR_IO;
682
    }
683
    (*str)[size] = '\0';
684

    
685
    return 0;
686
}
687

    
688
/*
689
 * Read the next element as a UTF-8 string.
690
 * 0 is success, < 0 is failure.
691
 */
692

    
693
static int
694
ebml_read_utf8 (MatroskaDemuxContext *matroska,
695
                uint32_t             *id,
696
                char                **str)
697
{
698
  return ebml_read_ascii(matroska, id, str);
699
}
700

    
701
/*
702
 * Read the next element as a date (nanoseconds since 1/1/2000).
703
 * 0 is success, < 0 is failure.
704
 */
705

    
706
static int
707
ebml_read_date (MatroskaDemuxContext *matroska,
708
                uint32_t             *id,
709
                int64_t              *date)
710
{
711
  return ebml_read_sint(matroska, id, date);
712
}
713

    
714
/*
715
 * Read the next element, but only the header. The contents
716
 * are supposed to be sub-elements which can be read separately.
717
 * 0 is success, < 0 is failure.
718
 */
719

    
720
static int
721
ebml_read_master (MatroskaDemuxContext *matroska,
722
                  uint32_t             *id)
723
{
724
    ByteIOContext *pb = &matroska->ctx->pb;
725
    uint64_t length;
726
    MatroskaLevel *level;
727
    int res;
728

    
729
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
730
        (res = ebml_read_element_length(matroska, &length)) < 0)
731
        return res;
732

    
733
    /* protect... (Heaven forbids that the '>' is true) */
734
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
735
        av_log(matroska->ctx, AV_LOG_ERROR,
736
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
737
        return AVERROR_NOTSUPP;
738
    }
739

    
740
    /* remember level */
741
    level = &matroska->levels[matroska->num_levels++];
742
    level->start = url_ftell(pb);
743
    level->length = length;
744

    
745
    return 0;
746
}
747

    
748
/*
749
 * Read the next element as binary data.
750
 * 0 is success, < 0 is failure.
751
 */
752

    
753
static int
754
ebml_read_binary (MatroskaDemuxContext *matroska,
755
                  uint32_t             *id,
756
                  uint8_t             **binary,
757
                  int                  *size)
758
{
759
    ByteIOContext *pb = &matroska->ctx->pb;
760
    uint64_t rlength;
761
    int res;
762

    
763
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
764
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
765
        return res;
766
    *size = rlength;
767

    
768
    if (!(*binary = av_malloc(*size))) {
769
        av_log(matroska->ctx, AV_LOG_ERROR,
770
               "Memory allocation error\n");
771
        return AVERROR_NOMEM;
772
    }
773

    
774
    if (get_buffer(pb, *binary, *size) != *size) {
775
        offset_t pos = url_ftell(pb);
776
        av_log(matroska->ctx, AV_LOG_ERROR,
777
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
778
        return AVERROR_IO;
779
    }
780

    
781
    return 0;
782
}
783

    
784
/*
785
 * Read signed/unsigned "EBML" numbers.
786
 * Return: number of bytes processed, < 0 on error.
787
 * XXX: use ebml_read_num().
788
 */
789

    
790
static int
791
matroska_ebmlnum_uint (uint8_t  *data,
792
                       uint32_t  size,
793
                       uint64_t *num)
794
{
795
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
796
    uint64_t total;
797

    
798
    if (size <= 0)
799
        return AVERROR_INVALIDDATA;
800

    
801
    total = data[0];
802
    while (read <= 8 && !(total & len_mask)) {
803
        read++;
804
        len_mask >>= 1;
805
    }
806
    if (read > 8)
807
        return AVERROR_INVALIDDATA;
808

    
809
    if ((total &= (len_mask - 1)) == len_mask - 1)
810
        num_ffs++;
811
    if (size < read)
812
        return AVERROR_INVALIDDATA;
813
    while (n < read) {
814
        if (data[n] == 0xff)
815
            num_ffs++;
816
        total = (total << 8) | data[n];
817
        n++;
818
    }
819

    
820
    if (read == num_ffs)
821
        *num = (uint64_t)-1;
822
    else
823
        *num = total;
824

    
825
    return read;
826
}
827

    
828
/*
829
 * Same as above, but signed.
830
 */
831

    
832
static int
833
matroska_ebmlnum_sint (uint8_t  *data,
834
                       uint32_t  size,
835
                       int64_t  *num)
836
{
837
    uint64_t unum;
838
    int res;
839

    
840
    /* read as unsigned number first */
841
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
842
        return res;
843

    
844
    /* make signed (weird way) */
845
    if (unum == (uint64_t)-1)
846
        *num = INT64_MAX;
847
    else
848
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
849

    
850
    return res;
851
}
852

    
853
/*
854
 * Read an EBML header.
855
 * 0 is success, < 0 is failure.
856
 */
857

    
858
static int
859
ebml_read_header (MatroskaDemuxContext *matroska,
860
                  char                **doctype,
861
                  int                  *version)
862
{
863
    uint32_t id;
864
    int level_up, res = 0;
865

    
866
    /* default init */
867
    if (doctype)
868
        *doctype = NULL;
869
    if (version)
870
        *version = 1;
871

    
872
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
873
        level_up != 0 || id != EBML_ID_HEADER) {
874
        av_log(matroska->ctx, AV_LOG_ERROR,
875
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
876
        return AVERROR_INVALIDDATA;
877
    }
878
    if ((res = ebml_read_master(matroska, &id)) < 0)
879
        return res;
880

    
881
    while (res == 0) {
882
        if (!(id = ebml_peek_id(matroska, &level_up)))
883
            return AVERROR_IO;
884

    
885
        /* end-of-header */
886
        if (level_up)
887
            break;
888

    
889
        switch (id) {
890
            /* is our read version uptodate? */
891
            case EBML_ID_EBMLREADVERSION: {
892
                uint64_t num;
893

    
894
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
895
                    return res;
896
                if (num > EBML_VERSION) {
897
                    av_log(matroska->ctx, AV_LOG_ERROR,
898
                           "EBML version %"PRIu64" (> %d) is not supported\n",
899
                           num, EBML_VERSION);
900
                    return AVERROR_INVALIDDATA;
901
                }
902
                break;
903
            }
904

    
905
            /* we only handle 8 byte lengths at max */
906
            case EBML_ID_EBMLMAXSIZELENGTH: {
907
                uint64_t num;
908

    
909
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
910
                    return res;
911
                if (num > sizeof(uint64_t)) {
912
                    av_log(matroska->ctx, AV_LOG_ERROR,
913
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
914
                           num, sizeof(uint64_t));
915
                    return AVERROR_INVALIDDATA;
916
                }
917
                break;
918
            }
919

    
920
            /* we handle 4 byte IDs at max */
921
            case EBML_ID_EBMLMAXIDLENGTH: {
922
                uint64_t num;
923

    
924
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
925
                    return res;
926
                if (num > sizeof(uint32_t)) {
927
                    av_log(matroska->ctx, AV_LOG_ERROR,
928
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
929
                            num, sizeof(uint32_t));
930
                    return AVERROR_INVALIDDATA;
931
                }
932
                break;
933
            }
934

    
935
            case EBML_ID_DOCTYPE: {
936
                char *text;
937

    
938
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
939
                    return res;
940
                if (doctype) {
941
                    if (*doctype)
942
                        av_free(*doctype);
943
                    *doctype = text;
944
                } else
945
                    av_free(text);
946
                break;
947
            }
948

    
949
            case EBML_ID_DOCTYPEREADVERSION: {
950
                uint64_t num;
951

    
952
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
953
                    return res;
954
                if (version)
955
                    *version = num;
956
                break;
957
            }
958

    
959
            default:
960
                av_log(matroska->ctx, AV_LOG_INFO,
961
                       "Unknown data type 0x%x in EBML header", id);
962
                /* pass-through */
963

    
964
            case EBML_ID_VOID:
965
            /* we ignore these two, as they don't tell us anything we
966
             * care about */
967
            case EBML_ID_EBMLVERSION:
968
            case EBML_ID_DOCTYPEVERSION:
969
                res = ebml_read_skip (matroska);
970
                break;
971
        }
972
    }
973

    
974
    return 0;
975
}
976

    
977
/*
978
 * Put one packet in an application-supplied AVPacket struct.
979
 * Returns 0 on success or -1 on failure.
980
 */
981

    
982
static int
983
matroska_deliver_packet (MatroskaDemuxContext *matroska,
984
                         AVPacket             *pkt)
985
{
986
    if (matroska->num_packets > 0) {
987
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
988
        av_free(matroska->packets[0]);
989
        if (matroska->num_packets > 1) {
990
            memmove(&matroska->packets[0], &matroska->packets[1],
991
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
992
            matroska->packets =
993
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
994
                           sizeof(AVPacket *));
995
        } else {
996
            av_freep(&matroska->packets);
997
        }
998
        matroska->num_packets--;
999
        return 0;
1000
    }
1001

    
1002
    return -1;
1003
}
1004

    
1005
/*
1006
 * Put a packet into our internal queue. Will be delivered to the
1007
 * user/application during the next get_packet() call.
1008
 */
1009

    
1010
static void
1011
matroska_queue_packet (MatroskaDemuxContext *matroska,
1012
                       AVPacket             *pkt)
1013
{
1014
    matroska->packets =
1015
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1016
                   sizeof(AVPacket *));
1017
    matroska->packets[matroska->num_packets] = pkt;
1018
    matroska->num_packets++;
1019
}
1020

    
1021

    
1022
/*
1023
 * Autodetecting...
1024
 */
1025

    
1026
static int
1027
matroska_probe (AVProbeData *p)
1028
{
1029
    uint64_t total = 0;
1030
    int len_mask = 0x80, size = 1, n = 1;
1031
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1032

    
1033
    /* ebml header? */
1034
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1035
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1036
        return 0;
1037

    
1038
    /* length of header */
1039
    total = p->buf[4];
1040
    while (size <= 8 && !(total & len_mask)) {
1041
        size++;
1042
        len_mask >>= 1;
1043
    }
1044
    if (size > 8)
1045
      return 0;
1046
    total &= (len_mask - 1);
1047
    while (n < size)
1048
        total = (total << 8) | p->buf[4 + n++];
1049

    
1050
    /* does the probe data contain the whole header? */
1051
    if (p->buf_size < 4 + size + total)
1052
      return 0;
1053

    
1054
    /* the header must contain the document type 'matroska'. For now,
1055
     * we don't parse the whole header but simply check for the
1056
     * availability of that array of characters inside the header.
1057
     * Not fully fool-proof, but good enough. */
1058
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
1059
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1060
            return AVPROBE_SCORE_MAX;
1061

    
1062
    return 0;
1063
}
1064

    
1065
/*
1066
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1067
 */
1068

    
1069
static int
1070
matroska_parse_info (MatroskaDemuxContext *matroska)
1071
{
1072
    int res = 0;
1073
    uint32_t id;
1074

    
1075
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1076

    
1077
    while (res == 0) {
1078
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1079
            res = AVERROR_IO;
1080
            break;
1081
        } else if (matroska->level_up) {
1082
            matroska->level_up--;
1083
            break;
1084
        }
1085

    
1086
        switch (id) {
1087
            /* cluster timecode */
1088
            case MATROSKA_ID_TIMECODESCALE: {
1089
                uint64_t num;
1090
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1091
                    break;
1092
                matroska->time_scale = num;
1093
                break;
1094
            }
1095

    
1096
            case MATROSKA_ID_DURATION: {
1097
                double num;
1098
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1099
                    break;
1100
                matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
1101
                break;
1102
            }
1103

    
1104
            case MATROSKA_ID_TITLE: {
1105
                char *text;
1106
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1107
                    break;
1108
                strncpy(matroska->ctx->title, text,
1109
                        sizeof(matroska->ctx->title)-1);
1110
                av_free(text);
1111
                break;
1112
            }
1113

    
1114
            case MATROSKA_ID_WRITINGAPP: {
1115
                char *text;
1116
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1117
                    break;
1118
                matroska->writing_app = text;
1119
                break;
1120
            }
1121

    
1122
            case MATROSKA_ID_MUXINGAPP: {
1123
                char *text;
1124
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1125
                    break;
1126
                matroska->muxing_app = text;
1127
                break;
1128
            }
1129

    
1130
            case MATROSKA_ID_DATEUTC: {
1131
                int64_t time;
1132
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1133
                    break;
1134
                matroska->created = time;
1135
                break;
1136
            }
1137

    
1138
            default:
1139
                av_log(matroska->ctx, AV_LOG_INFO,
1140
                       "Unknown entry 0x%x in info header\n", id);
1141
                /* fall-through */
1142

    
1143
            case EBML_ID_VOID:
1144
                res = ebml_read_skip(matroska);
1145
                break;
1146
        }
1147

    
1148
        if (matroska->level_up) {
1149
            matroska->level_up--;
1150
            break;
1151
        }
1152
    }
1153

    
1154
    return res;
1155
}
1156

    
1157
static int
1158
matroska_add_stream (MatroskaDemuxContext *matroska)
1159
{
1160
    int res = 0;
1161
    uint32_t id;
1162
    MatroskaTrack *track;
1163

    
1164
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1165

    
1166
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1167
    track = av_mallocz(MAX_TRACK_SIZE);
1168
    matroska->num_tracks++;
1169

    
1170
    /* start with the master */
1171
    if ((res = ebml_read_master(matroska, &id)) < 0)
1172
        return res;
1173

    
1174
    /* try reading the trackentry headers */
1175
    while (res == 0) {
1176
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1177
            res = AVERROR_IO;
1178
            break;
1179
        } else if (matroska->level_up > 0) {
1180
            matroska->level_up--;
1181
            break;
1182
        }
1183

    
1184
        switch (id) {
1185
            /* track number (unique stream ID) */
1186
            case MATROSKA_ID_TRACKNUMBER: {
1187
                uint64_t num;
1188
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1189
                    break;
1190
                track->num = num;
1191
                break;
1192
            }
1193

    
1194
            /* track UID (unique identifier) */
1195
            case MATROSKA_ID_TRACKUID: {
1196
                uint64_t num;
1197
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1198
                    break;
1199
                track->uid = num;
1200
                break;
1201
            }
1202

    
1203
            /* track type (video, audio, combined, subtitle, etc.) */
1204
            case MATROSKA_ID_TRACKTYPE: {
1205
                uint64_t num;
1206
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1207
                    break;
1208
                if (track->type && track->type != num) {
1209
                    av_log(matroska->ctx, AV_LOG_INFO,
1210
                           "More than one tracktype in an entry - skip\n");
1211
                    break;
1212
                }
1213
                track->type = num;
1214

    
1215
                switch (track->type) {
1216
                    case MATROSKA_TRACK_TYPE_VIDEO:
1217
                    case MATROSKA_TRACK_TYPE_AUDIO:
1218
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1219
                        break;
1220
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1221
                    case MATROSKA_TRACK_TYPE_LOGO:
1222
                    case MATROSKA_TRACK_TYPE_CONTROL:
1223
                    default:
1224
                        av_log(matroska->ctx, AV_LOG_INFO,
1225
                               "Unknown or unsupported track type 0x%x\n",
1226
                               track->type);
1227
                        track->type = 0;
1228
                        break;
1229
                }
1230
                matroska->tracks[matroska->num_tracks - 1] = track;
1231
                break;
1232
            }
1233

    
1234
            /* tracktype specific stuff for video */
1235
            case MATROSKA_ID_TRACKVIDEO: {
1236
                MatroskaVideoTrack *videotrack;
1237
                if (!track->type)
1238
                    track->type = MATROSKA_TRACK_TYPE_VIDEO;
1239
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1240
                    av_log(matroska->ctx, AV_LOG_INFO,
1241
                           "video data in non-video track - ignoring\n");
1242
                    res = AVERROR_INVALIDDATA;
1243
                    break;
1244
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1245
                    break;
1246
                videotrack = (MatroskaVideoTrack *)track;
1247

    
1248
                while (res == 0) {
1249
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1250
                        res = AVERROR_IO;
1251
                        break;
1252
                    } else if (matroska->level_up > 0) {
1253
                        matroska->level_up--;
1254
                        break;
1255
                    }
1256

    
1257
                    switch (id) {
1258
                        /* fixme, this should be one-up, but I get it here */
1259
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1260
                            uint64_t num;
1261
                            if ((res = ebml_read_uint (matroska, &id,
1262
                                                       &num)) < 0)
1263
                                break;
1264
                            track->default_duration = num/matroska->time_scale;
1265
                            break;
1266
                        }
1267

    
1268
                        /* video framerate */
1269
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1270
                            double num;
1271
                            if ((res = ebml_read_float(matroska, &id,
1272
                                                       &num)) < 0)
1273
                                break;
1274
                            track->default_duration = 1000000000/(matroska->time_scale*num);
1275
                            break;
1276
                        }
1277

    
1278
                        /* width of the size to display the video at */
1279
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1280
                            uint64_t num;
1281
                            if ((res = ebml_read_uint(matroska, &id,
1282
                                                      &num)) < 0)
1283
                                break;
1284
                            videotrack->display_width = num;
1285
                            break;
1286
                        }
1287

    
1288
                        /* height of the size to display the video at */
1289
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1290
                            uint64_t num;
1291
                            if ((res = ebml_read_uint(matroska, &id,
1292
                                                      &num)) < 0)
1293
                                break;
1294
                            videotrack->display_height = num;
1295
                            break;
1296
                        }
1297

    
1298
                        /* width of the video in the file */
1299
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1300
                            uint64_t num;
1301
                            if ((res = ebml_read_uint(matroska, &id,
1302
                                                      &num)) < 0)
1303
                                break;
1304
                            videotrack->pixel_width = num;
1305
                            break;
1306
                        }
1307

    
1308
                        /* height of the video in the file */
1309
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1310
                            uint64_t num;
1311
                            if ((res = ebml_read_uint(matroska, &id,
1312
                                                      &num)) < 0)
1313
                                break;
1314
                            videotrack->pixel_height = num;
1315
                            break;
1316
                        }
1317

    
1318
                        /* whether the video is interlaced */
1319
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1320
                            uint64_t num;
1321
                            if ((res = ebml_read_uint(matroska, &id,
1322
                                                      &num)) < 0)
1323
                                break;
1324
                            if (num)
1325
                                track->flags |=
1326
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1327
                            else
1328
                                track->flags &=
1329
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1330
                            break;
1331
                        }
1332

    
1333
                        /* stereo mode (whether the video has two streams,
1334
                         * where one is for the left eye and the other for
1335
                         * the right eye, which creates a 3D-like
1336
                         * effect) */
1337
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1338
                            uint64_t num;
1339
                            if ((res = ebml_read_uint(matroska, &id,
1340
                                                      &num)) < 0)
1341
                                break;
1342
                            if (num != MATROSKA_EYE_MODE_MONO &&
1343
                                num != MATROSKA_EYE_MODE_LEFT &&
1344
                                num != MATROSKA_EYE_MODE_RIGHT &&
1345
                                num != MATROSKA_EYE_MODE_BOTH) {
1346
                                av_log(matroska->ctx, AV_LOG_INFO,
1347
                                       "Ignoring unknown eye mode 0x%x\n",
1348
                                       (uint32_t) num);
1349
                                break;
1350
                            }
1351
                            videotrack->eye_mode = num;
1352
                            break;
1353
                        }
1354

    
1355
                        /* aspect ratio behaviour */
1356
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1357
                            uint64_t num;
1358
                            if ((res = ebml_read_uint(matroska, &id,
1359
                                                      &num)) < 0)
1360
                                break;
1361
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1362
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1363
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1364
                                av_log(matroska->ctx, AV_LOG_INFO,
1365
                                       "Ignoring unknown aspect ratio 0x%x\n",
1366
                                       (uint32_t) num);
1367
                                break;
1368
                            }
1369
                            videotrack->ar_mode = num;
1370
                            break;
1371
                        }
1372

    
1373
                        /* colourspace (only matters for raw video)
1374
                         * fourcc */
1375
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1376
                            uint64_t num;
1377
                            if ((res = ebml_read_uint(matroska, &id,
1378
                                                      &num)) < 0)
1379
                                break;
1380
                            videotrack->fourcc = num;
1381
                            break;
1382
                        }
1383

    
1384
                        default:
1385
                            av_log(matroska->ctx, AV_LOG_INFO,
1386
                                   "Unknown video track header entry "
1387
                                   "0x%x - ignoring\n", id);
1388
                            /* pass-through */
1389

    
1390
                        case EBML_ID_VOID:
1391
                            res = ebml_read_skip(matroska);
1392
                            break;
1393
                    }
1394

    
1395
                    if (matroska->level_up) {
1396
                        matroska->level_up--;
1397
                        break;
1398
                    }
1399
                }
1400
                break;
1401
            }
1402

    
1403
            /* tracktype specific stuff for audio */
1404
            case MATROSKA_ID_TRACKAUDIO: {
1405
                MatroskaAudioTrack *audiotrack;
1406
                if (!track->type)
1407
                    track->type = MATROSKA_TRACK_TYPE_AUDIO;
1408
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1409
                    av_log(matroska->ctx, AV_LOG_INFO,
1410
                           "audio data in non-audio track - ignoring\n");
1411
                    res = AVERROR_INVALIDDATA;
1412
                    break;
1413
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1414
                    break;
1415
                audiotrack = (MatroskaAudioTrack *)track;
1416
                audiotrack->channels = 1;
1417
                audiotrack->samplerate = 8000;
1418

    
1419
                while (res == 0) {
1420
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1421
                        res = AVERROR_IO;
1422
                        break;
1423
                    } else if (matroska->level_up > 0) {
1424
                        matroska->level_up--;
1425
                        break;
1426
                    }
1427

    
1428
                    switch (id) {
1429
                        /* samplerate */
1430
                        case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
1431
                            double num;
1432
                            if ((res = ebml_read_float(matroska, &id,
1433
                                                       &num)) < 0)
1434
                                break;
1435
                            audiotrack->internal_samplerate =
1436
                            audiotrack->samplerate = num;
1437
                            break;
1438
                        }
1439

    
1440
                        case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: {
1441
                            double num;
1442
                            if ((res = ebml_read_float(matroska, &id,
1443
                                                       &num)) < 0)
1444
                                break;
1445
                            audiotrack->samplerate = num;
1446
                            break;
1447
                        }
1448

    
1449
                            /* bitdepth */
1450
                        case MATROSKA_ID_AUDIOBITDEPTH: {
1451
                            uint64_t num;
1452
                            if ((res = ebml_read_uint(matroska, &id,
1453
                                                      &num)) < 0)
1454
                                break;
1455
                            audiotrack->bitdepth = num;
1456
                            break;
1457
                        }
1458

    
1459
                            /* channels */
1460
                        case MATROSKA_ID_AUDIOCHANNELS: {
1461
                            uint64_t num;
1462
                            if ((res = ebml_read_uint(matroska, &id,
1463
                                                      &num)) < 0)
1464
                                break;
1465
                            audiotrack->channels = num;
1466
                            break;
1467
                        }
1468

    
1469
                        default:
1470
                            av_log(matroska->ctx, AV_LOG_INFO,
1471
                                   "Unknown audio track header entry "
1472
                                   "0x%x - ignoring\n", id);
1473
                            /* pass-through */
1474

    
1475
                        case EBML_ID_VOID:
1476
                            res = ebml_read_skip(matroska);
1477
                            break;
1478
                    }
1479

    
1480
                    if (matroska->level_up) {
1481
                        matroska->level_up--;
1482
                        break;
1483
                    }
1484
                }
1485
                break;
1486
            }
1487

    
1488
                /* codec identifier */
1489
            case MATROSKA_ID_CODECID: {
1490
                char *text;
1491
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
1492
                    break;
1493
                track->codec_id = text;
1494
                break;
1495
            }
1496

    
1497
                /* codec private data */
1498
            case MATROSKA_ID_CODECPRIVATE: {
1499
                uint8_t *data;
1500
                int size;
1501
                if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
1502
                    break;
1503
                track->codec_priv = data;
1504
                track->codec_priv_size = size;
1505
                break;
1506
            }
1507

    
1508
                /* name of the codec */
1509
            case MATROSKA_ID_CODECNAME: {
1510
                char *text;
1511
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1512
                    break;
1513
                track->codec_name = text;
1514
                break;
1515
            }
1516

    
1517
                /* name of this track */
1518
            case MATROSKA_ID_TRACKNAME: {
1519
                char *text;
1520
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1521
                    break;
1522
                track->name = text;
1523
                break;
1524
            }
1525

    
1526
                /* language (matters for audio/subtitles, mostly) */
1527
            case MATROSKA_ID_TRACKLANGUAGE: {
1528
                char *text;
1529
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1530
                    break;
1531
                track->language = text;
1532
                break;
1533
            }
1534

    
1535
                /* whether this is actually used */
1536
            case MATROSKA_ID_TRACKFLAGENABLED: {
1537
                uint64_t num;
1538
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1539
                    break;
1540
                if (num)
1541
                    track->flags |= MATROSKA_TRACK_ENABLED;
1542
                else
1543
                    track->flags &= ~MATROSKA_TRACK_ENABLED;
1544
                break;
1545
            }
1546

    
1547
                /* whether it's the default for this track type */
1548
            case MATROSKA_ID_TRACKFLAGDEFAULT: {
1549
                uint64_t num;
1550
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1551
                    break;
1552
                if (num)
1553
                    track->flags |= MATROSKA_TRACK_DEFAULT;
1554
                else
1555
                    track->flags &= ~MATROSKA_TRACK_DEFAULT;
1556
                break;
1557
            }
1558

    
1559
                /* lacing (like MPEG, where blocks don't end/start on frame
1560
                 * boundaries) */
1561
            case MATROSKA_ID_TRACKFLAGLACING: {
1562
                uint64_t num;
1563
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1564
                    break;
1565
                if (num)
1566
                    track->flags |= MATROSKA_TRACK_LACING;
1567
                else
1568
                    track->flags &= ~MATROSKA_TRACK_LACING;
1569
                break;
1570
            }
1571

    
1572
                /* default length (in time) of one data block in this track */
1573
            case MATROSKA_ID_TRACKDEFAULTDURATION: {
1574
                uint64_t num;
1575
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1576
                    break;
1577
                track->default_duration = num / matroska->time_scale;
1578
                break;
1579
            }
1580

    
1581
            default:
1582
                av_log(matroska->ctx, AV_LOG_INFO,
1583
                       "Unknown track header entry 0x%x - ignoring\n", id);
1584
                /* pass-through */
1585

    
1586
            case EBML_ID_VOID:
1587
            /* we ignore these because they're nothing useful. */
1588
            case MATROSKA_ID_CODECINFOURL:
1589
            case MATROSKA_ID_CODECDOWNLOADURL:
1590
            case MATROSKA_ID_TRACKMINCACHE:
1591
            case MATROSKA_ID_TRACKMAXCACHE:
1592
                res = ebml_read_skip(matroska);
1593
                break;
1594
        }
1595

    
1596
        if (matroska->level_up) {
1597
            matroska->level_up--;
1598
            break;
1599
        }
1600
    }
1601

    
1602
    return res;
1603
}
1604

    
1605
static int
1606
matroska_parse_tracks (MatroskaDemuxContext *matroska)
1607
{
1608
    int res = 0;
1609
    uint32_t id;
1610

    
1611
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
1612

    
1613
    while (res == 0) {
1614
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1615
            res = AVERROR_IO;
1616
            break;
1617
        } else if (matroska->level_up) {
1618
            matroska->level_up--;
1619
            break;
1620
        }
1621

    
1622
        switch (id) {
1623
            /* one track within the "all-tracks" header */
1624
            case MATROSKA_ID_TRACKENTRY:
1625
                res = matroska_add_stream(matroska);
1626
                break;
1627

    
1628
            default:
1629
                av_log(matroska->ctx, AV_LOG_INFO,
1630
                       "Unknown entry 0x%x in track header\n", id);
1631
                /* fall-through */
1632

    
1633
            case EBML_ID_VOID:
1634
                res = ebml_read_skip(matroska);
1635
                break;
1636
        }
1637

    
1638
        if (matroska->level_up) {
1639
            matroska->level_up--;
1640
            break;
1641
        }
1642
    }
1643

    
1644
    return res;
1645
}
1646

    
1647
static int
1648
matroska_parse_index (MatroskaDemuxContext *matroska)
1649
{
1650
    int res = 0;
1651
    uint32_t id;
1652
    MatroskaDemuxIndex idx;
1653

    
1654
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
1655

    
1656
    while (res == 0) {
1657
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1658
            res = AVERROR_IO;
1659
            break;
1660
        } else if (matroska->level_up) {
1661
            matroska->level_up--;
1662
            break;
1663
        }
1664

    
1665
        switch (id) {
1666
            /* one single index entry ('point') */
1667
            case MATROSKA_ID_POINTENTRY:
1668
                if ((res = ebml_read_master(matroska, &id)) < 0)
1669
                    break;
1670

    
1671
                /* in the end, we hope to fill one entry with a
1672
                 * timestamp, a file position and a tracknum */
1673
                idx.pos   = (uint64_t) -1;
1674
                idx.time  = (uint64_t) -1;
1675
                idx.track = (uint16_t) -1;
1676

    
1677
                while (res == 0) {
1678
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1679
                        res = AVERROR_IO;
1680
                        break;
1681
                    } else if (matroska->level_up) {
1682
                        matroska->level_up--;
1683
                        break;
1684
                    }
1685

    
1686
                    switch (id) {
1687
                        /* one single index entry ('point') */
1688
                        case MATROSKA_ID_CUETIME: {
1689
                            uint64_t time;
1690
                            if ((res = ebml_read_uint(matroska, &id,
1691
                                                      &time)) < 0)
1692
                                break;
1693
                            idx.time = time * matroska->time_scale;
1694
                            break;
1695
                        }
1696

    
1697
                        /* position in the file + track to which it
1698
                         * belongs */
1699
                        case MATROSKA_ID_CUETRACKPOSITION:
1700
                            if ((res = ebml_read_master(matroska, &id)) < 0)
1701
                                break;
1702

    
1703
                            while (res == 0) {
1704
                                if (!(id = ebml_peek_id (matroska,
1705
                                                    &matroska->level_up))) {
1706
                                    res = AVERROR_IO;
1707
                                    break;
1708
                                } else if (matroska->level_up) {
1709
                                    matroska->level_up--;
1710
                                    break;
1711
                                }
1712

    
1713
                                switch (id) {
1714
                                    /* track number */
1715
                                    case MATROSKA_ID_CUETRACK: {
1716
                                        uint64_t num;
1717
                                        if ((res = ebml_read_uint(matroska,
1718
                                                          &id, &num)) < 0)
1719
                                            break;
1720
                                        idx.track = num;
1721
                                        break;
1722
                                    }
1723

    
1724
                                        /* position in file */
1725
                                    case MATROSKA_ID_CUECLUSTERPOSITION: {
1726
                                        uint64_t num;
1727
                                        if ((res = ebml_read_uint(matroska,
1728
                                                          &id, &num)) < 0)
1729
                                            break;
1730
                                        idx.pos = num;
1731
                                        break;
1732
                                    }
1733

    
1734
                                    default:
1735
                                        av_log(matroska->ctx, AV_LOG_INFO,
1736
                                               "Unknown entry 0x%x in "
1737
                                               "CuesTrackPositions\n", id);
1738
                                        /* fall-through */
1739

    
1740
                                    case EBML_ID_VOID:
1741
                                        res = ebml_read_skip(matroska);
1742
                                        break;
1743
                                }
1744

    
1745
                                if (matroska->level_up) {
1746
                                    matroska->level_up--;
1747
                                    break;
1748
                                }
1749
                            }
1750

    
1751
                            break;
1752

    
1753
                        default:
1754
                            av_log(matroska->ctx, AV_LOG_INFO,
1755
                                   "Unknown entry 0x%x in cuespoint "
1756
                                   "index\n", id);
1757
                            /* fall-through */
1758

    
1759
                        case EBML_ID_VOID:
1760
                            res = ebml_read_skip(matroska);
1761
                            break;
1762
                    }
1763

    
1764
                    if (matroska->level_up) {
1765
                        matroska->level_up--;
1766
                        break;
1767
                    }
1768
                }
1769

    
1770
                /* so let's see if we got what we wanted */
1771
                if (idx.pos   != (uint64_t) -1 &&
1772
                    idx.time  != (uint64_t) -1 &&
1773
                    idx.track != (uint16_t) -1) {
1774
                    if (matroska->num_indexes % 32 == 0) {
1775
                        /* re-allocate bigger index */
1776
                        matroska->index =
1777
                            av_realloc(matroska->index,
1778
                                       (matroska->num_indexes + 32) *
1779
                                       sizeof(MatroskaDemuxIndex));
1780
                    }
1781
                    matroska->index[matroska->num_indexes] = idx;
1782
                    matroska->num_indexes++;
1783
                }
1784
                break;
1785

    
1786
            default:
1787
                av_log(matroska->ctx, AV_LOG_INFO,
1788
                       "Unknown entry 0x%x in cues header\n", id);
1789
                /* fall-through */
1790

    
1791
            case EBML_ID_VOID:
1792
                res = ebml_read_skip(matroska);
1793
                break;
1794
        }
1795

    
1796
        if (matroska->level_up) {
1797
            matroska->level_up--;
1798
            break;
1799
        }
1800
    }
1801

    
1802
    return res;
1803
}
1804

    
1805
static int
1806
matroska_parse_metadata (MatroskaDemuxContext *matroska)
1807
{
1808
    int res = 0;
1809
    uint32_t id;
1810

    
1811
    while (res == 0) {
1812
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1813
            res = AVERROR_IO;
1814
            break;
1815
        } else if (matroska->level_up) {
1816
            matroska->level_up--;
1817
            break;
1818
        }
1819

    
1820
        switch (id) {
1821
            /* Hm, this is unsupported... */
1822
            default:
1823
                av_log(matroska->ctx, AV_LOG_INFO,
1824
                       "Unknown entry 0x%x in metadata header\n", id);
1825
                /* fall-through */
1826

    
1827
            case EBML_ID_VOID:
1828
                res = ebml_read_skip(matroska);
1829
                break;
1830
        }
1831

    
1832
        if (matroska->level_up) {
1833
            matroska->level_up--;
1834
            break;
1835
        }
1836
    }
1837

    
1838
    return res;
1839
}
1840

    
1841
static int
1842
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
1843
{
1844
    int res = 0;
1845
    uint32_t id;
1846

    
1847
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
1848

    
1849
    while (res == 0) {
1850
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1851
            res = AVERROR_IO;
1852
            break;
1853
        } else if (matroska->level_up) {
1854
            matroska->level_up--;
1855
            break;
1856
        }
1857

    
1858
        switch (id) {
1859
            case MATROSKA_ID_SEEKENTRY: {
1860
                uint32_t seek_id = 0, peek_id_cache = 0;
1861
                uint64_t seek_pos = (uint64_t) -1, t;
1862

    
1863
                if ((res = ebml_read_master(matroska, &id)) < 0)
1864
                    break;
1865

    
1866
                while (res == 0) {
1867
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1868
                        res = AVERROR_IO;
1869
                        break;
1870
                    } else if (matroska->level_up) {
1871
                        matroska->level_up--;
1872
                        break;
1873
                    }
1874

    
1875
                    switch (id) {
1876
                        case MATROSKA_ID_SEEKID:
1877
                            res = ebml_read_uint(matroska, &id, &t);
1878
                            seek_id = t;
1879
                            break;
1880

    
1881
                        case MATROSKA_ID_SEEKPOSITION:
1882
                            res = ebml_read_uint(matroska, &id, &seek_pos);
1883
                            break;
1884

    
1885
                        default:
1886
                            av_log(matroska->ctx, AV_LOG_INFO,
1887
                                   "Unknown seekhead ID 0x%x\n", id);
1888
                            /* fall-through */
1889

    
1890
                        case EBML_ID_VOID:
1891
                            res = ebml_read_skip(matroska);
1892
                            break;
1893
                    }
1894

    
1895
                    if (matroska->level_up) {
1896
                        matroska->level_up--;
1897
                        break;
1898
                    }
1899
                }
1900

    
1901
                if (!seek_id || seek_pos == (uint64_t) -1) {
1902
                    av_log(matroska->ctx, AV_LOG_INFO,
1903
                           "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
1904
                           seek_id, seek_pos);
1905
                    break;
1906
                }
1907

    
1908
                switch (seek_id) {
1909
                    case MATROSKA_ID_CUES:
1910
                    case MATROSKA_ID_TAGS: {
1911
                        uint32_t level_up = matroska->level_up;
1912
                        offset_t before_pos;
1913
                        uint64_t length;
1914
                        MatroskaLevel level;
1915

    
1916
                        /* remember the peeked ID and the current position */
1917
                        peek_id_cache = matroska->peek_id;
1918
                        before_pos = url_ftell(&matroska->ctx->pb);
1919

    
1920
                        /* seek */
1921
                        if ((res = ebml_read_seek(matroska, seek_pos +
1922
                                               matroska->segment_start)) < 0)
1923
                            return res;
1924

    
1925
                        /* we don't want to lose our seekhead level, so we add
1926
                         * a dummy. This is a crude hack. */
1927
                        if (matroska->num_levels == EBML_MAX_DEPTH) {
1928
                            av_log(matroska->ctx, AV_LOG_INFO,
1929
                                   "Max EBML element depth (%d) reached, "
1930
                                   "cannot parse further.\n", EBML_MAX_DEPTH);
1931
                            return AVERROR_UNKNOWN;
1932
                        }
1933

    
1934
                        level.start = 0;
1935
                        level.length = (uint64_t)-1;
1936
                        matroska->levels[matroska->num_levels] = level;
1937
                        matroska->num_levels++;
1938

    
1939
                        /* check ID */
1940
                        if (!(id = ebml_peek_id (matroska,
1941
                                                 &matroska->level_up)))
1942
                            goto finish;
1943
                        if (id != seek_id) {
1944
                            av_log(matroska->ctx, AV_LOG_INFO,
1945
                                   "We looked for ID=0x%x but got "
1946
                                   "ID=0x%x (pos=%"PRIu64")",
1947
                                   seek_id, id, seek_pos +
1948
                                   matroska->segment_start);
1949
                            goto finish;
1950
                        }
1951

    
1952
                        /* read master + parse */
1953
                        if ((res = ebml_read_master(matroska, &id)) < 0)
1954
                            goto finish;
1955
                        switch (id) {
1956
                            case MATROSKA_ID_CUES:
1957
                                if (!(res = matroska_parse_index(matroska)) ||
1958
                                    url_feof(&matroska->ctx->pb)) {
1959
                                    matroska->index_parsed = 1;
1960
                                    res = 0;
1961
                                }
1962
                                break;
1963
                            case MATROSKA_ID_TAGS:
1964
                                if (!(res = matroska_parse_metadata(matroska)) ||
1965
                                   url_feof(&matroska->ctx->pb)) {
1966
                                    matroska->metadata_parsed = 1;
1967
                                    res = 0;
1968
                                }
1969
                                break;
1970
                        }
1971

    
1972
                    finish:
1973
                        /* remove dummy level */
1974
                        while (matroska->num_levels) {
1975
                            matroska->num_levels--;
1976
                            length =
1977
                                matroska->levels[matroska->num_levels].length;
1978
                            if (length == (uint64_t)-1)
1979
                                break;
1980
                        }
1981

    
1982
                        /* seek back */
1983
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1984
                            return res;
1985
                        matroska->peek_id = peek_id_cache;
1986
                        matroska->level_up = level_up;
1987
                        break;
1988
                    }
1989

    
1990
                    default:
1991
                        av_log(matroska->ctx, AV_LOG_INFO,
1992
                               "Ignoring seekhead entry for ID=0x%x\n",
1993
                               seek_id);
1994
                        break;
1995
                }
1996

    
1997
                break;
1998
            }
1999

    
2000
            default:
2001
                av_log(matroska->ctx, AV_LOG_INFO,
2002
                       "Unknown seekhead ID 0x%x\n", id);
2003
                /* fall-through */
2004

    
2005
            case EBML_ID_VOID:
2006
                res = ebml_read_skip(matroska);
2007
                break;
2008
        }
2009

    
2010
        if (matroska->level_up) {
2011
            matroska->level_up--;
2012
            break;
2013
        }
2014
    }
2015

    
2016
    return res;
2017
}
2018

    
2019
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2020

    
2021
static int
2022
matroska_aac_profile (char *codec_id)
2023
{
2024
    static const char *aac_profiles[] = {
2025
        "MAIN", "LC", "SSR"
2026
    };
2027
    int profile;
2028

    
2029
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2030
        if (strstr(codec_id, aac_profiles[profile]))
2031
            break;
2032
    return profile + 1;
2033
}
2034

    
2035
static int
2036
matroska_aac_sri (int samplerate)
2037
{
2038
    static const int aac_sample_rates[] = {
2039
        96000, 88200, 64000, 48000, 44100, 32000,
2040
        24000, 22050, 16000, 12000, 11025,  8000,
2041
    };
2042
    int sri;
2043

    
2044
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2045
        if (aac_sample_rates[sri] == samplerate)
2046
            break;
2047
    return sri;
2048
}
2049

    
2050
static int
2051
matroska_read_header (AVFormatContext    *s,
2052
                      AVFormatParameters *ap)
2053
{
2054
    MatroskaDemuxContext *matroska = s->priv_data;
2055
    char *doctype;
2056
    int version, last_level, res = 0;
2057
    uint32_t id;
2058

    
2059
    matroska->ctx = s;
2060

    
2061
    /* First read the EBML header. */
2062
    doctype = NULL;
2063
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2064
        return res;
2065
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2066
        av_log(matroska->ctx, AV_LOG_ERROR,
2067
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2068
               doctype ? doctype : "(none)");
2069
        if (doctype)
2070
            av_free(doctype);
2071
        return AVERROR_NOFMT;
2072
    }
2073
    av_free(doctype);
2074
    if (version > 2) {
2075
        av_log(matroska->ctx, AV_LOG_ERROR,
2076
               "Matroska demuxer version 2 too old for file version %d\n",
2077
               version);
2078
        return AVERROR_NOFMT;
2079
    }
2080

    
2081
    /* The next thing is a segment. */
2082
    while (1) {
2083
        if (!(id = ebml_peek_id(matroska, &last_level)))
2084
            return AVERROR_IO;
2085
        if (id == MATROSKA_ID_SEGMENT)
2086
            break;
2087

    
2088
        /* oi! */
2089
        av_log(matroska->ctx, AV_LOG_INFO,
2090
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2091
               MATROSKA_ID_SEGMENT, id);
2092
        if ((res = ebml_read_skip(matroska)) < 0)
2093
            return res;
2094
    }
2095

    
2096
    /* We now have a Matroska segment.
2097
     * Seeks are from the beginning of the segment,
2098
     * after the segment ID/length. */
2099
    if ((res = ebml_read_master(matroska, &id)) < 0)
2100
        return res;
2101
    matroska->segment_start = url_ftell(&s->pb);
2102

    
2103
    matroska->time_scale = 1000000;
2104
    /* we've found our segment, start reading the different contents in here */
2105
    while (res == 0) {
2106
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2107
            res = AVERROR_IO;
2108
            break;
2109
        } else if (matroska->level_up) {
2110
            matroska->level_up--;
2111
            break;
2112
        }
2113

    
2114
        switch (id) {
2115
            /* stream info */
2116
            case MATROSKA_ID_INFO: {
2117
                if ((res = ebml_read_master(matroska, &id)) < 0)
2118
                    break;
2119
                res = matroska_parse_info(matroska);
2120
                break;
2121
            }
2122

    
2123
            /* track info headers */
2124
            case MATROSKA_ID_TRACKS: {
2125
                if ((res = ebml_read_master(matroska, &id)) < 0)
2126
                    break;
2127
                res = matroska_parse_tracks(matroska);
2128
                break;
2129
            }
2130

    
2131
            /* stream index */
2132
            case MATROSKA_ID_CUES: {
2133
                if (!matroska->index_parsed) {
2134
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2135
                        break;
2136
                    res = matroska_parse_index(matroska);
2137
                } else
2138
                    res = ebml_read_skip(matroska);
2139
                break;
2140
            }
2141

    
2142
            /* metadata */
2143
            case MATROSKA_ID_TAGS: {
2144
                if (!matroska->metadata_parsed) {
2145
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2146
                        break;
2147
                    res = matroska_parse_metadata(matroska);
2148
                } else
2149
                    res = ebml_read_skip(matroska);
2150
                break;
2151
            }
2152

    
2153
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2154
            case MATROSKA_ID_SEEKHEAD: {
2155
                if ((res = ebml_read_master(matroska, &id)) < 0)
2156
                    break;
2157
                res = matroska_parse_seekhead(matroska);
2158
                break;
2159
            }
2160

    
2161
            case MATROSKA_ID_CLUSTER: {
2162
                /* Do not read the master - this will be done in the next
2163
                 * call to matroska_read_packet. */
2164
                res = 1;
2165
                break;
2166
            }
2167

    
2168
            default:
2169
                av_log(matroska->ctx, AV_LOG_INFO,
2170
                       "Unknown matroska file header ID 0x%x\n", id);
2171
            /* fall-through */
2172

    
2173
            case EBML_ID_VOID:
2174
                res = ebml_read_skip(matroska);
2175
                break;
2176
        }
2177

    
2178
        if (matroska->level_up) {
2179
            matroska->level_up--;
2180
            break;
2181
        }
2182
    }
2183

    
2184
    /* Have we found a cluster? */
2185
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2186
        int i, j;
2187
        MatroskaTrack *track;
2188
        AVStream *st;
2189

    
2190
        for (i = 0; i < matroska->num_tracks; i++) {
2191
            enum CodecID codec_id = CODEC_ID_NONE;
2192
            uint8_t *extradata = NULL;
2193
            int extradata_size = 0;
2194
            int extradata_offset = 0;
2195
            track = matroska->tracks[i];
2196

    
2197
            /* libavformat does not really support subtitles.
2198
             * Also apply some sanity checks. */
2199
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2200
                (track->codec_id == NULL))
2201
                continue;
2202

    
2203
            for(j=0; codec_tags[j].str; j++){
2204
                if(!strncmp(codec_tags[j].str, track->codec_id,
2205
                            strlen(codec_tags[j].str))){
2206
                    codec_id= codec_tags[j].id;
2207
                    break;
2208
                }
2209
            }
2210

    
2211
            /* Set the FourCC from the CodecID. */
2212
            /* This is the MS compatibility mode which stores a
2213
             * BITMAPINFOHEADER in the CodecPrivate. */
2214
            if (!strcmp(track->codec_id,
2215
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2216
                (track->codec_priv_size >= 40) &&
2217
                (track->codec_priv != NULL)) {
2218
                unsigned char *p;
2219

    
2220
                /* Offset of biCompression. Stored in LE. */
2221
                p = (unsigned char *)track->codec_priv + 16;
2222
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2223
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2224
                codec_id = codec_get_id(codec_bmp_tags, ((MatroskaVideoTrack *)track)->fourcc);
2225

    
2226
            }
2227

    
2228
            /* This is the MS compatibility mode which stores a
2229
             * WAVEFORMATEX in the CodecPrivate. */
2230
            else if (!strcmp(track->codec_id,
2231
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2232
                (track->codec_priv_size >= 18) &&
2233
                (track->codec_priv != NULL)) {
2234
                unsigned char *p;
2235
                uint16_t tag;
2236

    
2237
                /* Offset of wFormatTag. Stored in LE. */
2238
                p = (unsigned char *)track->codec_priv;
2239
                tag = (p[1] << 8) | p[0];
2240
                codec_id = codec_get_id(codec_wav_tags, tag);
2241

    
2242
            }
2243

    
2244
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
2245
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2246
                int profile = matroska_aac_profile(track->codec_id);
2247
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2248
                extradata = av_malloc(5);
2249
                if (extradata == NULL)
2250
                    return AVERROR_NOMEM;
2251
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2252
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2253
                if (strstr(track->codec_id, "SBR")) {
2254
                    sri = matroska_aac_sri(audiotrack->samplerate);
2255
                    extradata[2] = 0x56;
2256
                    extradata[3] = 0xE5;
2257
                    extradata[4] = 0x80 | (sri<<3);
2258
                    extradata_size = 5;
2259
                } else {
2260
                    extradata_size = 2;
2261
                }
2262
                track->default_duration = 1024*1000 / audiotrack->internal_samplerate;
2263
            }
2264

    
2265
            else if (codec_id == CODEC_ID_TTA) {
2266
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2267
                ByteIOContext b;
2268
                extradata_size = 30;
2269
                extradata = av_mallocz(extradata_size);
2270
                if (extradata == NULL)
2271
                    return AVERROR_NOMEM;
2272
                init_put_byte(&b, extradata, extradata_size, 1,
2273
                              NULL, NULL, NULL, NULL);
2274
                put_buffer(&b, (uint8_t *) "TTA1", 4);
2275
                put_le16(&b, 1);
2276
                put_le16(&b, audiotrack->channels);
2277
                put_le16(&b, audiotrack->bitdepth);
2278
                put_le32(&b, audiotrack->samplerate);
2279
                put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
2280
            }
2281

    
2282
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
2283
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
2284
                extradata_offset = 26;
2285
                track->codec_priv_size -= extradata_offset;
2286
                track->flags |= MATROSKA_TRACK_REAL_V;
2287
            }
2288

    
2289
            if (codec_id == CODEC_ID_NONE) {
2290
                av_log(matroska->ctx, AV_LOG_INFO,
2291
                       "Unknown/unsupported CodecID %s.\n",
2292
                       track->codec_id);
2293
            }
2294

    
2295
            track->stream_index = matroska->num_streams;
2296

    
2297
            matroska->num_streams++;
2298
            st = av_new_stream(s, track->stream_index);
2299
            if (st == NULL)
2300
                return AVERROR_NOMEM;
2301
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2302

    
2303
            st->codec->codec_id = codec_id;
2304
            st->start_time = 0;
2305

    
2306
            if (track->default_duration)
2307
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2308
                          track->default_duration, 1000, 30000);
2309

    
2310
            if(extradata){
2311
                st->codec->extradata = extradata;
2312
                st->codec->extradata_size = extradata_size;
2313
            } else if(track->codec_priv && track->codec_priv_size > 0){
2314
                st->codec->extradata = av_malloc(track->codec_priv_size);
2315
                if(st->codec->extradata == NULL)
2316
                    return AVERROR_NOMEM;
2317
                st->codec->extradata_size = track->codec_priv_size;
2318
                memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
2319
                       track->codec_priv_size);
2320
            }
2321

    
2322
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2323
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2324

    
2325
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2326
                st->codec->codec_tag = videotrack->fourcc;
2327
                st->codec->width = videotrack->pixel_width;
2328
                st->codec->height = videotrack->pixel_height;
2329
                if (videotrack->display_width == 0)
2330
                    videotrack->display_width= videotrack->pixel_width;
2331
                if (videotrack->display_height == 0)
2332
                    videotrack->display_height= videotrack->pixel_height;
2333
                av_reduce(&st->codec->sample_aspect_ratio.num,
2334
                          &st->codec->sample_aspect_ratio.den,
2335
                          st->codec->height * videotrack->display_width,
2336
                          st->codec-> width * videotrack->display_height,
2337
                          255);
2338
                st->need_parsing = 2;
2339
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2340
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2341

    
2342
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2343
                st->codec->sample_rate = audiotrack->samplerate;
2344
                st->codec->channels = audiotrack->channels;
2345
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2346
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2347
            }
2348

    
2349
            /* What do we do with private data? E.g. for Vorbis. */
2350
        }
2351
        res = 0;
2352
    }
2353

    
2354
    return res;
2355
}
2356

    
2357
static int
2358
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2359
                            int                   num)
2360
{
2361
    int i;
2362

    
2363
    for (i = 0; i < matroska->num_tracks; i++)
2364
        if (matroska->tracks[i]->num == num)
2365
            return i;
2366

    
2367
    return -1;
2368
}
2369

    
2370
static inline int
2371
rv_offset(uint8_t *data, int slice, int slices)
2372
{
2373
    return AV_RL32(data+8*slice+4) + 8*slices;
2374
}
2375

    
2376
static int
2377
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
2378
                     int64_t pos, uint64_t cluster_time, uint64_t duration,
2379
                     int is_keyframe, int is_bframe)
2380
{
2381
    int res = 0;
2382
    int track;
2383
    AVPacket *pkt;
2384
    uint8_t *origdata = data;
2385
    int16_t block_time;
2386
    uint32_t *lace_size = NULL;
2387
    int n, flags, laces = 0;
2388
    uint64_t num;
2389

    
2390
    /* first byte(s): tracknum */
2391
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2392
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2393
        av_free(origdata);
2394
        return res;
2395
    }
2396
    data += n;
2397
    size -= n;
2398

    
2399
    /* fetch track from num */
2400
    track = matroska_find_track_by_num(matroska, num);
2401
    if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2402
        av_log(matroska->ctx, AV_LOG_INFO,
2403
               "Invalid stream %d or size %u\n", track, size);
2404
        av_free(origdata);
2405
        return res;
2406
    }
2407
    if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2408
        av_free(origdata);
2409
        return res;
2410
    }
2411
    if (duration == AV_NOPTS_VALUE)
2412
        duration = matroska->tracks[track]->default_duration;
2413

    
2414
    /* block_time (relative to cluster time) */
2415
    block_time = (data[0] << 8) | data[1];
2416
    data += 2;
2417
    size -= 2;
2418
    flags = *data;
2419
    data += 1;
2420
    size -= 1;
2421
    if (is_keyframe == -1)
2422
        is_keyframe = flags & 1 ? PKT_FLAG_KEY : 0;
2423
    switch ((flags & 0x06) >> 1) {
2424
        case 0x0: /* no lacing */
2425
            laces = 1;
2426
            lace_size = av_mallocz(sizeof(int));
2427
            lace_size[0] = size;
2428
            break;
2429

    
2430
        case 0x1: /* xiph lacing */
2431
        case 0x2: /* fixed-size lacing */
2432
        case 0x3: /* EBML lacing */
2433
            if (size == 0) {
2434
                res = -1;
2435
                break;
2436
            }
2437
            laces = (*data) + 1;
2438
            data += 1;
2439
            size -= 1;
2440
            lace_size = av_mallocz(laces * sizeof(int));
2441

    
2442
            switch ((flags & 0x06) >> 1) {
2443
                case 0x1: /* xiph lacing */ {
2444
                    uint8_t temp;
2445
                    uint32_t total = 0;
2446
                    for (n = 0; res == 0 && n < laces - 1; n++) {
2447
                        while (1) {
2448
                            if (size == 0) {
2449
                                res = -1;
2450
                                break;
2451
                            }
2452
                            temp = *data;
2453
                            lace_size[n] += temp;
2454
                            data += 1;
2455
                            size -= 1;
2456
                            if (temp != 0xff)
2457
                                break;
2458
                        }
2459
                        total += lace_size[n];
2460
                    }
2461
                    lace_size[n] = size - total;
2462
                    break;
2463
                }
2464

    
2465
                case 0x2: /* fixed-size lacing */
2466
                    for (n = 0; n < laces; n++)
2467
                        lace_size[n] = size / laces;
2468
                    break;
2469

    
2470
                case 0x3: /* EBML lacing */ {
2471
                    uint32_t total;
2472
                    n = matroska_ebmlnum_uint(data, size, &num);
2473
                    if (n < 0) {
2474
                        av_log(matroska->ctx, AV_LOG_INFO,
2475
                               "EBML block data error\n");
2476
                        break;
2477
                    }
2478
                    data += n;
2479
                    size -= n;
2480
                    total = lace_size[0] = num;
2481
                    for (n = 1; res == 0 && n < laces - 1; n++) {
2482
                        int64_t snum;
2483
                        int r;
2484
                        r = matroska_ebmlnum_sint (data, size, &snum);
2485
                        if (r < 0) {
2486
                            av_log(matroska->ctx, AV_LOG_INFO,
2487
                                   "EBML block data error\n");
2488
                            break;
2489
                        }
2490
                        data += r;
2491
                        size -= r;
2492
                        lace_size[n] = lace_size[n - 1] + snum;
2493
                        total += lace_size[n];
2494
                    }
2495
                    lace_size[n] = size - total;
2496
                    break;
2497
                }
2498
            }
2499
            break;
2500
    }
2501

    
2502
    if (res == 0) {
2503
        int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
2504
        uint64_t timecode = AV_NOPTS_VALUE;
2505

    
2506
        if (cluster_time != (uint64_t)-1 && cluster_time + block_time >= 0)
2507
            timecode = cluster_time + block_time;
2508

    
2509
        for (n = 0; n < laces; n++) {
2510
            int slice, slices = 1;
2511

    
2512
            if (real_v) {
2513
                slices = *data++ + 1;
2514
                lace_size[n]--;
2515
            }
2516

    
2517
            for (slice=0; slice<slices; slice++) {
2518
                int slice_size, slice_offset = 0;
2519
                if (real_v)
2520
                    slice_offset = rv_offset(data, slice, slices);
2521
                if (slice+1 == slices)
2522
                    slice_size = lace_size[n] - slice_offset;
2523
                else
2524
                    slice_size = rv_offset(data, slice+1, slices) - slice_offset;
2525
                pkt = av_mallocz(sizeof(AVPacket));
2526
                /* XXX: prevent data copy... */
2527
                if (av_new_packet(pkt, slice_size) < 0) {
2528
                    res = AVERROR_NOMEM;
2529
                    n = laces-1;
2530
                    break;
2531
                }
2532
                memcpy (pkt->data, data+slice_offset, slice_size);
2533

    
2534
                if (n == 0)
2535
                    pkt->flags = is_keyframe;
2536
                pkt->stream_index = matroska->tracks[track]->stream_index;
2537

    
2538
                pkt->pts = timecode;
2539
                pkt->pos = pos;
2540
                pkt->duration = duration;
2541

    
2542
                    matroska_queue_packet(matroska, pkt);
2543

    
2544
                if (timecode != AV_NOPTS_VALUE)
2545
                    timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
2546
            }
2547
            data += lace_size[n];
2548
        }
2549
    }
2550

    
2551
    av_free(lace_size);
2552
    av_free(origdata);
2553
    return res;
2554
}
2555

    
2556
static int
2557
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2558
                           uint64_t              cluster_time)
2559
{
2560
    int res = 0;
2561
    uint32_t id;
2562
    int is_bframe = 0;
2563
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2564
    uint64_t duration = AV_NOPTS_VALUE;
2565
    uint8_t *data;
2566
    int size = 0;
2567
    int64_t pos = 0;
2568

    
2569
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2570

    
2571
    while (res == 0) {
2572
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2573
            res = AVERROR_IO;
2574
            break;
2575
        } else if (matroska->level_up) {
2576
            matroska->level_up--;
2577
            break;
2578
        }
2579

    
2580
        switch (id) {
2581
            /* one block inside the group. Note, block parsing is one
2582
             * of the harder things, so this code is a bit complicated.
2583
             * See http://www.matroska.org/ for documentation. */
2584
            case MATROSKA_ID_BLOCK: {
2585
                pos = url_ftell(&matroska->ctx->pb);
2586
                res = ebml_read_binary(matroska, &id, &data, &size);
2587
                break;
2588
            }
2589

    
2590
            case MATROSKA_ID_BLOCKDURATION: {
2591
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2592
                    break;
2593
                duration /= matroska->time_scale;
2594
                break;
2595
            }
2596

    
2597
            case MATROSKA_ID_BLOCKREFERENCE: {
2598
                int64_t num;
2599
                /* We've found a reference, so not even the first frame in
2600
                 * the lace is a key frame. */
2601
                is_keyframe = 0;
2602
                if (last_num_packets != matroska->num_packets)
2603
                    matroska->packets[last_num_packets]->flags = 0;
2604
                if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
2605
                    break;
2606
                if (num > 0)
2607
                    is_bframe = 1;
2608
                break;
2609
            }
2610

    
2611
            default:
2612
                av_log(matroska->ctx, AV_LOG_INFO,
2613
                       "Unknown entry 0x%x in blockgroup data\n", id);
2614
                /* fall-through */
2615

    
2616
            case EBML_ID_VOID:
2617
                res = ebml_read_skip(matroska);
2618
                break;
2619
        }
2620

    
2621
        if (matroska->level_up) {
2622
            matroska->level_up--;
2623
            break;
2624
        }
2625
    }
2626

    
2627
    if (res)
2628
        return res;
2629

    
2630
    if (size > 0)
2631
        res = matroska_parse_block(matroska, data, size, pos, cluster_time,
2632
                                   duration, is_keyframe, is_bframe);
2633

    
2634
    return res;
2635
}
2636

    
2637
static int
2638
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2639
{
2640
    int res = 0;
2641
    uint32_t id;
2642
    uint64_t cluster_time = 0;
2643
    uint8_t *data;
2644
    int64_t pos;
2645
    int size;
2646

    
2647
    av_log(matroska->ctx, AV_LOG_DEBUG,
2648
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2649

    
2650
    while (res == 0) {
2651
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2652
            res = AVERROR_IO;
2653
            break;
2654
        } else if (matroska->level_up) {
2655
            matroska->level_up--;
2656
            break;
2657
        }
2658

    
2659
        switch (id) {
2660
            /* cluster timecode */
2661
            case MATROSKA_ID_CLUSTERTIMECODE: {
2662
                uint64_t num;
2663
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2664
                    break;
2665
                cluster_time = num;
2666
                break;
2667
            }
2668

    
2669
                /* a group of blocks inside a cluster */
2670
            case MATROSKA_ID_BLOCKGROUP:
2671
                if ((res = ebml_read_master(matroska, &id)) < 0)
2672
                    break;
2673
                res = matroska_parse_blockgroup(matroska, cluster_time);
2674
                break;
2675

    
2676
            case MATROSKA_ID_SIMPLEBLOCK:
2677
                pos = url_ftell(&matroska->ctx->pb);
2678
                res = ebml_read_binary(matroska, &id, &data, &size);
2679
                if (res == 0)
2680
                    res = matroska_parse_block(matroska, data, size, pos,
2681
                                               cluster_time, AV_NOPTS_VALUE,
2682
                                               -1, 0);
2683
                break;
2684

    
2685
            default:
2686
                av_log(matroska->ctx, AV_LOG_INFO,
2687
                       "Unknown entry 0x%x in cluster data\n", id);
2688
                /* fall-through */
2689

    
2690
            case EBML_ID_VOID:
2691
                res = ebml_read_skip(matroska);
2692
                break;
2693
        }
2694

    
2695
        if (matroska->level_up) {
2696
            matroska->level_up--;
2697
            break;
2698
        }
2699
    }
2700

    
2701
    return res;
2702
}
2703

    
2704
static int
2705
matroska_read_packet (AVFormatContext *s,
2706
                      AVPacket        *pkt)
2707
{
2708
    MatroskaDemuxContext *matroska = s->priv_data;
2709
    int res = 0;
2710
    uint32_t id;
2711

    
2712
    /* Read stream until we have a packet queued. */
2713
    while (matroska_deliver_packet(matroska, pkt)) {
2714

    
2715
        /* Have we already reached the end? */
2716
        if (matroska->done)
2717
            return AVERROR_IO;
2718

    
2719
        while (res == 0) {
2720
            if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2721
                return AVERROR_IO;
2722
            } else if (matroska->level_up) {
2723
                matroska->level_up--;
2724
                break;
2725
            }
2726

    
2727
            switch (id) {
2728
                case MATROSKA_ID_CLUSTER:
2729
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2730
                        break;
2731
                    if ((res = matroska_parse_cluster(matroska)) == 0)
2732
                        res = 1; /* Parsed one cluster, let's get out. */
2733
                    break;
2734

    
2735
                default:
2736
                case EBML_ID_VOID:
2737
                    res = ebml_read_skip(matroska);
2738
                    break;
2739
            }
2740

    
2741
            if (matroska->level_up) {
2742
                matroska->level_up--;
2743
                break;
2744
            }
2745
        }
2746

    
2747
        if (res == -1)
2748
            matroska->done = 1;
2749
    }
2750

    
2751
    return 0;
2752
}
2753

    
2754
static int
2755
matroska_read_close (AVFormatContext *s)
2756
{
2757
    MatroskaDemuxContext *matroska = s->priv_data;
2758
    int n = 0;
2759

    
2760
    av_free(matroska->writing_app);
2761
    av_free(matroska->muxing_app);
2762
    av_free(matroska->index);
2763

    
2764
    if (matroska->packets != NULL) {
2765
        for (n = 0; n < matroska->num_packets; n++) {
2766
            av_free_packet(matroska->packets[n]);
2767
            av_free(matroska->packets[n]);
2768
        }
2769
        av_free(matroska->packets);
2770
    }
2771

    
2772
    for (n = 0; n < matroska->num_tracks; n++) {
2773
        MatroskaTrack *track = matroska->tracks[n];
2774
        av_free(track->codec_id);
2775
        av_free(track->codec_name);
2776
        av_free(track->codec_priv);
2777
        av_free(track->name);
2778
        av_free(track->language);
2779

    
2780
        av_free(track);
2781
    }
2782

    
2783
    return 0;
2784
}
2785

    
2786
AVInputFormat matroska_demuxer = {
2787
    "matroska",
2788
    "Matroska file format",
2789
    sizeof(MatroskaDemuxContext),
2790
    matroska_probe,
2791
    matroska_read_header,
2792
    matroska_read_packet,
2793
    matroska_read_close,
2794
};