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/*
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 * Matroska file demuxer (no muxer yet)
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 * Copyright (c) 2003-2004 The ffmpeg Project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 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"
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/* For codec_get_id(). */
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#include "riff.h"
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#include "intfloat_readwrite.h"
35

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

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

    
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/* general EBML types */
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#define EBML_ID_VOID               0xEC
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54
/*
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 * Matroska element IDs. max. 32-bit.
56
 */
57

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

    
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/* matroska top-level master IDs */
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#define MATROSKA_ID_INFO       0x1549A966
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#define MATROSKA_ID_TRACKS     0x1654AE6B
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#define MATROSKA_ID_CUES       0x1C53BB6B
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#define MATROSKA_ID_TAGS       0x1254C367
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#define MATROSKA_ID_SEEKHEAD   0x114D9B74
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#define MATROSKA_ID_CLUSTER    0x1F43B675
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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
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/* ID in the tracks master */
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#define MATROSKA_ID_TRACKENTRY 0xAE
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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
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#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
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100
/* IDs in the trackvideo master */
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#define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3
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#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
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/* ID in the cues master */
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#define MATROSKA_ID_POINTENTRY 0xBB
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/* 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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/* IDs in the cuetrackposition master */
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#define MATROSKA_ID_CUETRACK   0xF7
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#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
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/* IDs in the tags master */
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/* TODO */
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/* IDs in the seekhead master */
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#define MATROSKA_ID_SEEKENTRY  0x4DBB
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/* IDs in the seekpoint master */
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#define MATROSKA_ID_SEEKID     0x53AB
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#define MATROSKA_ID_SEEKPOSITION 0x53AC
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/* 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
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/* 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 {
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  MATROSKA_TRACK_TYPE_VIDEO    = 0x1,
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  MATROSKA_TRACK_TYPE_AUDIO    = 0x2,
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  MATROSKA_TRACK_TYPE_COMPLEX  = 0x3,
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  MATROSKA_TRACK_TYPE_LOGO     = 0x10,
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  MATROSKA_TRACK_TYPE_SUBTITLE = 0x11,
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  MATROSKA_TRACK_TYPE_CONTROL  = 0x20,
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} MatroskaTrackType;
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158
typedef enum {
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  MATROSKA_EYE_MODE_MONO  = 0x0,
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  MATROSKA_EYE_MODE_RIGHT = 0x1,
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  MATROSKA_EYE_MODE_LEFT  = 0x2,
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  MATROSKA_EYE_MODE_BOTH  = 0x3,
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} MatroskaEyeMode;
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165
typedef enum {
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  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,
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} MatroskaAspectRatioMode;
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/*
172
 * These aren't in any way "matroska-form" things,
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 * it's just something I use in the muxer/demuxer.
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 */
175

    
176
typedef enum {
177
  MATROSKA_TRACK_ENABLED = (1<<0),
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  MATROSKA_TRACK_DEFAULT = (1<<1),
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  MATROSKA_TRACK_LACING  = (1<<2),
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  MATROSKA_TRACK_REAL_V  = (1<<4),
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  MATROSKA_TRACK_SHIFT   = (1<<16)
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} MatroskaTrackFlags;
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184
typedef enum {
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  MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
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} MatroskaVideoTrackFlags;
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188
/*
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 * Matroska Codec IDs. Strings.
190
 */
191

    
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typedef struct CodecTags{
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    const char *str;
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    enum CodecID id;
195
}CodecTags;
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#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC   "V_MS/VFW/FOURCC"
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#define MATROSKA_CODEC_ID_AUDIO_ACM          "A_MS/ACM"
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static CodecTags codec_tags[]={
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//    {"V_MS/VFW/FOURCC"  , CODEC_ID_NONE},
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    {"V_UNCOMPRESSED"   , CODEC_ID_RAWVIDEO},
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    {"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},
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    {"V_MPEG2"          , CODEC_ID_MPEG2VIDEO},
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    {"V_MJPEG"          , CODEC_ID_MJPEG},
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    {"V_REAL/RV10"      , CODEC_ID_RV10},
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    {"V_REAL/RV20"      , CODEC_ID_RV20},
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    {"V_REAL/RV30"      , CODEC_ID_RV30},
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    {"V_REAL/RV40"      , CODEC_ID_RV40},
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/* TODO: Real/Quicktime */
216

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

    
235
/* max. depth in the EBML tree structure */
236
#define EBML_MAX_DEPTH 16
237

    
238
typedef struct Track {
239
    MatroskaTrackType type;
240

    
241
    /* Unique track number and track ID. stream_index is the index that
242
     * the calling app uses for this track. */
243
    uint32_t num,
244
        uid,
245
        stream_index;
246

    
247
    char *name,
248
        *language;
249

    
250
    char *codec_id,
251
        *codec_name;
252

    
253
    unsigned char *codec_priv;
254
    int codec_priv_size;
255

    
256
    int64_t default_duration;
257
    MatroskaTrackFlags flags;
258
} MatroskaTrack;
259

    
260
typedef struct MatroskaVideoTrack {
261
    MatroskaTrack track;
262

    
263
    int pixel_width,
264
        pixel_height,
265
        display_width,
266
        display_height;
267

    
268
    uint32_t fourcc;
269

    
270
    MatroskaAspectRatioMode ar_mode;
271
    MatroskaEyeMode eye_mode;
272

    
273
    //..
274
} MatroskaVideoTrack;
275

    
276
typedef struct MatroskaAudioTrack {
277
    MatroskaTrack track;
278

    
279
    int channels,
280
        bitdepth,
281
        internal_samplerate,
282
        samplerate;
283
    //..
284
} MatroskaAudioTrack;
285

    
286
typedef struct MatroskaSubtitleTrack {
287
    MatroskaTrack track;
288

    
289
    //..
290
} MatroskaSubtitleTrack;
291

    
292
#define MAX_TRACK_SIZE (FFMAX(FFMAX(sizeof(MatroskaVideoTrack), \
293
                                    sizeof(MatroskaAudioTrack)), \
294
                                    sizeof(MatroskaSubtitleTrack)))
295

    
296
typedef struct MatroskaLevel {
297
    uint64_t start, length;
298
} MatroskaLevel;
299

    
300
typedef struct MatroskaDemuxIndex {
301
  uint64_t        pos;   /* of the corresponding *cluster*! */
302
  uint16_t        track; /* reference to 'num' */
303
  uint64_t        time;  /* in nanoseconds */
304
} MatroskaDemuxIndex;
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306
typedef struct MatroskaDemuxContext {
307
    AVFormatContext *ctx;
308

    
309
    /* ebml stuff */
310
    int num_levels;
311
    MatroskaLevel levels[EBML_MAX_DEPTH];
312
    int level_up;
313

    
314
    /* matroska stuff */
315
    char *writing_app,
316
        *muxing_app;
317
    int64_t created;
318

    
319
    /* timescale in the file */
320
    int64_t time_scale;
321

    
322
    /* position (time, ns) */
323
    int64_t pos;
324

    
325
    /* num_streams is the number of streams that av_new_stream() was called
326
     * for ( = that are available to the calling program). */
327
    int num_tracks, num_streams;
328
    MatroskaTrack *tracks[MAX_STREAMS];
329

    
330
    /* cache for ID peeking */
331
    uint32_t peek_id;
332

    
333
    /* byte position of the segment inside the stream */
334
    offset_t segment_start;
335

    
336
    /* The packet queue. */
337
    AVPacket **packets;
338
    int num_packets;
339

    
340
    /* have we already parse metadata/cues/clusters? */
341
    int metadata_parsed,
342
        index_parsed,
343
        done;
344

    
345
    /* The index for seeking. */
346
    int num_indexes;
347
    MatroskaDemuxIndex *index;
348
} MatroskaDemuxContext;
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350
/*
351
 * The first few functions handle EBML file parsing. The rest
352
 * is the document interpretation. Matroska really just is a
353
 * EBML file.
354
 */
355

    
356
/*
357
 * Return: the amount of levels in the hierarchy that the
358
 * current element lies higher than the previous one.
359
 * The opposite isn't done - that's auto-done using master
360
 * element reading.
361
 */
362

    
363
static int
364
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
365
{
366
    ByteIOContext *pb = &matroska->ctx->pb;
367
    offset_t pos = url_ftell(pb);
368
    int num = 0;
369

    
370
    while (matroska->num_levels > 0) {
371
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
372

    
373
        if (pos >= level->start + level->length) {
374
            matroska->num_levels--;
375
            num++;
376
        } else {
377
            break;
378
        }
379
    }
380

    
381
    return num;
382
}
383

    
384
/*
385
 * Read: an "EBML number", which is defined as a variable-length
386
 * array of bytes. The first byte indicates the length by giving a
387
 * number of 0-bits followed by a one. The position of the first
388
 * "one" bit inside the first byte indicates the length of this
389
 * number.
390
 * Returns: num. of bytes read. < 0 on error.
391
 */
392

    
393
static int
394
ebml_read_num (MatroskaDemuxContext *matroska,
395
               int                   max_size,
396
               uint64_t             *number)
397
{
398
    ByteIOContext *pb = &matroska->ctx->pb;
399
    int len_mask = 0x80, read = 1, n = 1;
400
    int64_t total = 0;
401

    
402
    /* the first byte tells us the length in bytes - get_byte() can normally
403
     * return 0, but since that's not a valid first ebmlID byte, we can
404
     * use it safely here to catch EOS. */
405
    if (!(total = get_byte(pb))) {
406
        /* we might encounter EOS here */
407
        if (!url_feof(pb)) {
408
            offset_t pos = url_ftell(pb);
409
            av_log(matroska->ctx, AV_LOG_ERROR,
410
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
411
                   pos, pos);
412
        }
413
        return AVERROR_IO; /* EOS or actual I/O error */
414
    }
415

    
416
    /* get the length of the EBML number */
417
    while (read <= max_size && !(total & len_mask)) {
418
        read++;
419
        len_mask >>= 1;
420
    }
421
    if (read > max_size) {
422
        offset_t pos = url_ftell(pb) - 1;
423
        av_log(matroska->ctx, AV_LOG_ERROR,
424
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
425
               (uint8_t) total, pos, pos);
426
        return AVERROR_INVALIDDATA;
427
    }
428

    
429
    /* read out length */
430
    total &= ~len_mask;
431
    while (n++ < read)
432
        total = (total << 8) | get_byte(pb);
433

    
434
    *number = total;
435

    
436
    return read;
437
}
438

    
439
/*
440
 * Read: the element content data ID.
441
 * Return: the number of bytes read or < 0 on error.
442
 */
443

    
444
static int
445
ebml_read_element_id (MatroskaDemuxContext *matroska,
446
                      uint32_t             *id,
447
                      int                  *level_up)
448
{
449
    int read;
450
    uint64_t total;
451

    
452
    /* if we re-call this, use our cached ID */
453
    if (matroska->peek_id != 0) {
454
        if (level_up)
455
            *level_up = 0;
456
        *id = matroska->peek_id;
457
        return 0;
458
    }
459

    
460
    /* read out the "EBML number", include tag in ID */
461
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
462
        return read;
463
    *id = matroska->peek_id  = total | (1 << (read * 7));
464

    
465
    /* level tracking */
466
    if (level_up)
467
        *level_up = ebml_read_element_level_up(matroska);
468

    
469
    return read;
470
}
471

    
472
/*
473
 * Read: element content length.
474
 * Return: the number of bytes read or < 0 on error.
475
 */
476

    
477
static int
478
ebml_read_element_length (MatroskaDemuxContext *matroska,
479
                          uint64_t             *length)
480
{
481
    /* clear cache since we're now beyond that data point */
482
    matroska->peek_id = 0;
483

    
484
    /* read out the "EBML number", include tag in ID */
485
    return ebml_read_num(matroska, 8, length);
486
}
487

    
488
/*
489
 * Return: the ID of the next element, or 0 on error.
490
 * Level_up contains the amount of levels that this
491
 * next element lies higher than the previous one.
492
 */
493

    
494
static uint32_t
495
ebml_peek_id (MatroskaDemuxContext *matroska,
496
              int                  *level_up)
497
{
498
    uint32_t id;
499

    
500
    assert(level_up != NULL);
501

    
502
    if (ebml_read_element_id(matroska, &id, level_up) < 0)
503
        return 0;
504

    
505
    return id;
506
}
507

    
508
/*
509
 * Seek to a given offset.
510
 * 0 is success, -1 is failure.
511
 */
512

    
513
static int
514
ebml_read_seek (MatroskaDemuxContext *matroska,
515
                offset_t              offset)
516
{
517
    ByteIOContext *pb = &matroska->ctx->pb;
518

    
519
    /* clear ID cache, if any */
520
    matroska->peek_id = 0;
521

    
522
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
523
}
524

    
525
/*
526
 * Skip the next element.
527
 * 0 is success, -1 is failure.
528
 */
529

    
530
static int
531
ebml_read_skip (MatroskaDemuxContext *matroska)
532
{
533
    ByteIOContext *pb = &matroska->ctx->pb;
534
    uint32_t id;
535
    uint64_t length;
536
    int res;
537

    
538
    if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
539
        (res = ebml_read_element_length(matroska, &length)) < 0)
540
        return res;
541

    
542
    url_fskip(pb, length);
543

    
544
    return 0;
545
}
546

    
547
/*
548
 * Read the next element as an unsigned int.
549
 * 0 is success, < 0 is failure.
550
 */
551

    
552
static int
553
ebml_read_uint (MatroskaDemuxContext *matroska,
554
                uint32_t             *id,
555
                uint64_t             *num)
556
{
557
    ByteIOContext *pb = &matroska->ctx->pb;
558
    int n = 0, size, res;
559
    uint64_t rlength;
560

    
561
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
562
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
563
        return res;
564
    size = rlength;
565
    if (size < 1 || size > 8) {
566
        offset_t pos = url_ftell(pb);
567
        av_log(matroska->ctx, AV_LOG_ERROR,
568
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
569
                size, pos, pos);
570
        return AVERROR_INVALIDDATA;
571
    }
572

    
573
    /* big-endian ordening; build up number */
574
    *num = 0;
575
    while (n++ < size)
576
        *num = (*num << 8) | get_byte(pb);
577

    
578
    return 0;
579
}
580

    
581
/*
582
 * Read the next element as a signed int.
583
 * 0 is success, < 0 is failure.
584
 */
585

    
586
static int
587
ebml_read_sint (MatroskaDemuxContext *matroska,
588
                uint32_t             *id,
589
                int64_t              *num)
590
{
591
    ByteIOContext *pb = &matroska->ctx->pb;
592
    int size, n = 1, negative = 0, res;
593
    uint64_t rlength;
594

    
595
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
596
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
597
        return res;
598
    size = rlength;
599
    if (size < 1 || size > 8) {
600
        offset_t pos = url_ftell(pb);
601
        av_log(matroska->ctx, AV_LOG_ERROR,
602
               "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
603
                size, pos, pos);
604
        return AVERROR_INVALIDDATA;
605
    }
606
    if ((*num = get_byte(pb)) & 0x80) {
607
        negative = 1;
608
        *num &= ~0x80;
609
    }
610
    while (n++ < size)
611
        *num = (*num << 8) | get_byte(pb);
612

    
613
    /* make signed */
614
    if (negative)
615
        *num = *num - (1LL << ((8 * size) - 1));
616

    
617
    return 0;
618
}
619

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

    
625
static int
626
ebml_read_float (MatroskaDemuxContext *matroska,
627
                 uint32_t             *id,
628
                 double               *num)
629
{
630
    ByteIOContext *pb = &matroska->ctx->pb;
631
    int size, res;
632
    uint64_t rlength;
633

    
634
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
635
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
636
        return res;
637
    size = rlength;
638

    
639
    if (size == 4) {
640
        *num= av_int2flt(get_be32(pb));
641
    } else if(size==8){
642
        *num= av_int2dbl(get_be64(pb));
643
    } else{
644
        offset_t pos = url_ftell(pb);
645
        av_log(matroska->ctx, AV_LOG_ERROR,
646
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
647
               size, pos, pos);
648
        return AVERROR_INVALIDDATA;
649
    }
650

    
651
    return 0;
652
}
653

    
654
/*
655
 * Read the next element as an ASCII string.
656
 * 0 is success, < 0 is failure.
657
 */
658

    
659
static int
660
ebml_read_ascii (MatroskaDemuxContext *matroska,
661
                 uint32_t             *id,
662
                 char                **str)
663
{
664
    ByteIOContext *pb = &matroska->ctx->pb;
665
    int size, res;
666
    uint64_t rlength;
667

    
668
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
669
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
670
        return res;
671
    size = rlength;
672

    
673
    /* ebml strings are usually not 0-terminated, so we allocate one
674
     * byte more, read the string and NULL-terminate it ourselves. */
675
    if (size < 0 || !(*str = av_malloc(size + 1))) {
676
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
677
        return AVERROR_NOMEM;
678
    }
679
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
680
        offset_t pos = url_ftell(pb);
681
        av_log(matroska->ctx, AV_LOG_ERROR,
682
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
683
        return AVERROR_IO;
684
    }
685
    (*str)[size] = '\0';
686

    
687
    return 0;
688
}
689

    
690
/*
691
 * Read the next element as a UTF-8 string.
692
 * 0 is success, < 0 is failure.
693
 */
694

    
695
static int
696
ebml_read_utf8 (MatroskaDemuxContext *matroska,
697
                uint32_t             *id,
698
                char                **str)
699
{
700
  return ebml_read_ascii(matroska, id, str);
701
}
702

    
703
/*
704
 * Read the next element as a date (nanoseconds since 1/1/2000).
705
 * 0 is success, < 0 is failure.
706
 */
707

    
708
static int
709
ebml_read_date (MatroskaDemuxContext *matroska,
710
                uint32_t             *id,
711
                int64_t              *date)
712
{
713
  return ebml_read_sint(matroska, id, date);
714
}
715

    
716
/*
717
 * Read the next element, but only the header. The contents
718
 * are supposed to be sub-elements which can be read separately.
719
 * 0 is success, < 0 is failure.
720
 */
721

    
722
static int
723
ebml_read_master (MatroskaDemuxContext *matroska,
724
                  uint32_t             *id)
725
{
726
    ByteIOContext *pb = &matroska->ctx->pb;
727
    uint64_t length;
728
    MatroskaLevel *level;
729
    int res;
730

    
731
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
732
        (res = ebml_read_element_length(matroska, &length)) < 0)
733
        return res;
734

    
735
    /* protect... (Heaven forbids that the '>' is true) */
736
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
737
        av_log(matroska->ctx, AV_LOG_ERROR,
738
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
739
        return AVERROR_NOTSUPP;
740
    }
741

    
742
    /* remember level */
743
    level = &matroska->levels[matroska->num_levels++];
744
    level->start = url_ftell(pb);
745
    level->length = length;
746

    
747
    return 0;
748
}
749

    
750
/*
751
 * Read the next element as binary data.
752
 * 0 is success, < 0 is failure.
753
 */
754

    
755
static int
756
ebml_read_binary (MatroskaDemuxContext *matroska,
757
                  uint32_t             *id,
758
                  uint8_t             **binary,
759
                  int                  *size)
760
{
761
    ByteIOContext *pb = &matroska->ctx->pb;
762
    uint64_t rlength;
763
    int res;
764

    
765
    if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
766
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
767
        return res;
768
    *size = rlength;
769

    
770
    if (!(*binary = av_malloc(*size))) {
771
        av_log(matroska->ctx, AV_LOG_ERROR,
772
               "Memory allocation error\n");
773
        return AVERROR_NOMEM;
774
    }
775

    
776
    if (get_buffer(pb, *binary, *size) != *size) {
777
        offset_t pos = url_ftell(pb);
778
        av_log(matroska->ctx, AV_LOG_ERROR,
779
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
780
        return AVERROR_IO;
781
    }
782

    
783
    return 0;
784
}
785

    
786
/*
787
 * Read signed/unsigned "EBML" numbers.
788
 * Return: number of bytes processed, < 0 on error.
789
 * XXX: use ebml_read_num().
790
 */
791

    
792
static int
793
matroska_ebmlnum_uint (uint8_t  *data,
794
                       uint32_t  size,
795
                       uint64_t *num)
796
{
797
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
798
    uint64_t total;
799

    
800
    if (size <= 0)
801
        return AVERROR_INVALIDDATA;
802

    
803
    total = data[0];
804
    while (read <= 8 && !(total & len_mask)) {
805
        read++;
806
        len_mask >>= 1;
807
    }
808
    if (read > 8)
809
        return AVERROR_INVALIDDATA;
810

    
811
    if ((total &= (len_mask - 1)) == len_mask - 1)
812
        num_ffs++;
813
    if (size < read)
814
        return AVERROR_INVALIDDATA;
815
    while (n < read) {
816
        if (data[n] == 0xff)
817
            num_ffs++;
818
        total = (total << 8) | data[n];
819
        n++;
820
    }
821

    
822
    if (read == num_ffs)
823
        *num = (uint64_t)-1;
824
    else
825
        *num = total;
826

    
827
    return read;
828
}
829

    
830
/*
831
 * Same as above, but signed.
832
 */
833

    
834
static int
835
matroska_ebmlnum_sint (uint8_t  *data,
836
                       uint32_t  size,
837
                       int64_t  *num)
838
{
839
    uint64_t unum;
840
    int res;
841

    
842
    /* read as unsigned number first */
843
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
844
        return res;
845

    
846
    /* make signed (weird way) */
847
    if (unum == (uint64_t)-1)
848
        *num = INT64_MAX;
849
    else
850
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
851

    
852
    return res;
853
}
854

    
855
/*
856
 * Read an EBML header.
857
 * 0 is success, < 0 is failure.
858
 */
859

    
860
static int
861
ebml_read_header (MatroskaDemuxContext *matroska,
862
                  char                **doctype,
863
                  int                  *version)
864
{
865
    uint32_t id;
866
    int level_up, res = 0;
867

    
868
    /* default init */
869
    if (doctype)
870
        *doctype = NULL;
871
    if (version)
872
        *version = 1;
873

    
874
    if (!(id = ebml_peek_id(matroska, &level_up)) ||
875
        level_up != 0 || id != EBML_ID_HEADER) {
876
        av_log(matroska->ctx, AV_LOG_ERROR,
877
               "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
878
        return AVERROR_INVALIDDATA;
879
    }
880
    if ((res = ebml_read_master(matroska, &id)) < 0)
881
        return res;
882

    
883
    while (res == 0) {
884
        if (!(id = ebml_peek_id(matroska, &level_up)))
885
            return AVERROR_IO;
886

    
887
        /* end-of-header */
888
        if (level_up)
889
            break;
890

    
891
        switch (id) {
892
            /* is our read version uptodate? */
893
            case EBML_ID_EBMLREADVERSION: {
894
                uint64_t num;
895

    
896
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
897
                    return res;
898
                if (num > EBML_VERSION) {
899
                    av_log(matroska->ctx, AV_LOG_ERROR,
900
                           "EBML version %"PRIu64" (> %d) is not supported\n",
901
                           num, EBML_VERSION);
902
                    return AVERROR_INVALIDDATA;
903
                }
904
                break;
905
            }
906

    
907
            /* we only handle 8 byte lengths at max */
908
            case EBML_ID_EBMLMAXSIZELENGTH: {
909
                uint64_t num;
910

    
911
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
912
                    return res;
913
                if (num > sizeof(uint64_t)) {
914
                    av_log(matroska->ctx, AV_LOG_ERROR,
915
                           "Integers of size %"PRIu64" (> %zd) not supported\n",
916
                           num, sizeof(uint64_t));
917
                    return AVERROR_INVALIDDATA;
918
                }
919
                break;
920
            }
921

    
922
            /* we handle 4 byte IDs at max */
923
            case EBML_ID_EBMLMAXIDLENGTH: {
924
                uint64_t num;
925

    
926
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
927
                    return res;
928
                if (num > sizeof(uint32_t)) {
929
                    av_log(matroska->ctx, AV_LOG_ERROR,
930
                           "IDs of size %"PRIu64" (> %zu) not supported\n",
931
                            num, sizeof(uint32_t));
932
                    return AVERROR_INVALIDDATA;
933
                }
934
                break;
935
            }
936

    
937
            case EBML_ID_DOCTYPE: {
938
                char *text;
939

    
940
                if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
941
                    return res;
942
                if (doctype) {
943
                    if (*doctype)
944
                        av_free(*doctype);
945
                    *doctype = text;
946
                } else
947
                    av_free(text);
948
                break;
949
            }
950

    
951
            case EBML_ID_DOCTYPEREADVERSION: {
952
                uint64_t num;
953

    
954
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
955
                    return res;
956
                if (version)
957
                    *version = num;
958
                break;
959
            }
960

    
961
            default:
962
                av_log(matroska->ctx, AV_LOG_INFO,
963
                       "Unknown data type 0x%x in EBML header", id);
964
                /* pass-through */
965

    
966
            case EBML_ID_VOID:
967
            /* we ignore these two, as they don't tell us anything we
968
             * care about */
969
            case EBML_ID_EBMLVERSION:
970
            case EBML_ID_DOCTYPEVERSION:
971
                res = ebml_read_skip (matroska);
972
                break;
973
        }
974
    }
975

    
976
    return 0;
977
}
978

    
979
/*
980
 * Put one packet in an application-supplied AVPacket struct.
981
 * Returns 0 on success or -1 on failure.
982
 */
983

    
984
static int
985
matroska_deliver_packet (MatroskaDemuxContext *matroska,
986
                         AVPacket             *pkt)
987
{
988
    if (matroska->num_packets > 0) {
989
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
990
        av_free(matroska->packets[0]);
991
        if (matroska->num_packets > 1) {
992
            memmove(&matroska->packets[0], &matroska->packets[1],
993
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
994
            matroska->packets =
995
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
996
                           sizeof(AVPacket *));
997
        } else {
998
            av_freep(&matroska->packets);
999
        }
1000
        matroska->num_packets--;
1001
        return 0;
1002
    }
1003

    
1004
    return -1;
1005
}
1006

    
1007
/*
1008
 * Put a packet into our internal queue. Will be delivered to the
1009
 * user/application during the next get_packet() call.
1010
 */
1011

    
1012
static void
1013
matroska_queue_packet (MatroskaDemuxContext *matroska,
1014
                       AVPacket             *pkt)
1015
{
1016
    matroska->packets =
1017
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
1018
                   sizeof(AVPacket *));
1019
    matroska->packets[matroska->num_packets] = pkt;
1020
    matroska->num_packets++;
1021
}
1022

    
1023
/*
1024
 * Autodetecting...
1025
 */
1026

    
1027
static int
1028
matroska_probe (AVProbeData *p)
1029
{
1030
    uint64_t total = 0;
1031
    int len_mask = 0x80, size = 1, n = 1;
1032
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
1033

    
1034
    if (p->buf_size < 5)
1035
        return 0;
1036

    
1037
    /* ebml header? */
1038
    if ((p->buf[0] << 24 | p->buf[1] << 16 |
1039
         p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
1040
        return 0;
1041

    
1042
    /* length of header */
1043
    total = p->buf[4];
1044
    while (size <= 8 && !(total & len_mask)) {
1045
        size++;
1046
        len_mask >>= 1;
1047
    }
1048
    if (size > 8)
1049
      return 0;
1050
    total &= (len_mask - 1);
1051
    while (n < size)
1052
        total = (total << 8) | p->buf[4 + n++];
1053

    
1054
    /* does the probe data contain the whole header? */
1055
    if (p->buf_size < 4 + size + total)
1056
      return 0;
1057

    
1058
    /* the header must contain the document type 'matroska'. For now,
1059
     * we don't parse the whole header but simply check for the
1060
     * availability of that array of characters inside the header.
1061
     * Not fully fool-proof, but good enough. */
1062
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
1063
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
1064
            return AVPROBE_SCORE_MAX;
1065

    
1066
    return 0;
1067
}
1068

    
1069
/*
1070
 * From here on, it's all XML-style DTD stuff... Needs no comments.
1071
 */
1072

    
1073
static int
1074
matroska_parse_info (MatroskaDemuxContext *matroska)
1075
{
1076
    int res = 0;
1077
    uint32_t id;
1078

    
1079
    av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
1080

    
1081
    while (res == 0) {
1082
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1083
            res = AVERROR_IO;
1084
            break;
1085
        } else if (matroska->level_up) {
1086
            matroska->level_up--;
1087
            break;
1088
        }
1089

    
1090
        switch (id) {
1091
            /* cluster timecode */
1092
            case MATROSKA_ID_TIMECODESCALE: {
1093
                uint64_t num;
1094
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1095
                    break;
1096
                matroska->time_scale = num;
1097
                break;
1098
            }
1099

    
1100
            case MATROSKA_ID_DURATION: {
1101
                double num;
1102
                if ((res = ebml_read_float(matroska, &id, &num)) < 0)
1103
                    break;
1104
                matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
1105
                break;
1106
            }
1107

    
1108
            case MATROSKA_ID_TITLE: {
1109
                char *text;
1110
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1111
                    break;
1112
                strncpy(matroska->ctx->title, text,
1113
                        sizeof(matroska->ctx->title)-1);
1114
                av_free(text);
1115
                break;
1116
            }
1117

    
1118
            case MATROSKA_ID_WRITINGAPP: {
1119
                char *text;
1120
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1121
                    break;
1122
                matroska->writing_app = text;
1123
                break;
1124
            }
1125

    
1126
            case MATROSKA_ID_MUXINGAPP: {
1127
                char *text;
1128
                if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
1129
                    break;
1130
                matroska->muxing_app = text;
1131
                break;
1132
            }
1133

    
1134
            case MATROSKA_ID_DATEUTC: {
1135
                int64_t time;
1136
                if ((res = ebml_read_date(matroska, &id, &time)) < 0)
1137
                    break;
1138
                matroska->created = time;
1139
                break;
1140
            }
1141

    
1142
            default:
1143
                av_log(matroska->ctx, AV_LOG_INFO,
1144
                       "Unknown entry 0x%x in info header\n", id);
1145
                /* fall-through */
1146

    
1147
            case EBML_ID_VOID:
1148
                res = ebml_read_skip(matroska);
1149
                break;
1150
        }
1151

    
1152
        if (matroska->level_up) {
1153
            matroska->level_up--;
1154
            break;
1155
        }
1156
    }
1157

    
1158
    return res;
1159
}
1160

    
1161
static int
1162
matroska_add_stream (MatroskaDemuxContext *matroska)
1163
{
1164
    int res = 0;
1165
    uint32_t id;
1166
    MatroskaTrack *track;
1167

    
1168
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
1169

    
1170
    /* Allocate a generic track. As soon as we know its type we'll realloc. */
1171
    track = av_mallocz(MAX_TRACK_SIZE);
1172
    matroska->num_tracks++;
1173

    
1174
    /* start with the master */
1175
    if ((res = ebml_read_master(matroska, &id)) < 0)
1176
        return res;
1177

    
1178
    /* try reading the trackentry headers */
1179
    while (res == 0) {
1180
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1181
            res = AVERROR_IO;
1182
            break;
1183
        } else if (matroska->level_up > 0) {
1184
            matroska->level_up--;
1185
            break;
1186
        }
1187

    
1188
        switch (id) {
1189
            /* track number (unique stream ID) */
1190
            case MATROSKA_ID_TRACKNUMBER: {
1191
                uint64_t num;
1192
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1193
                    break;
1194
                track->num = num;
1195
                break;
1196
            }
1197

    
1198
            /* track UID (unique identifier) */
1199
            case MATROSKA_ID_TRACKUID: {
1200
                uint64_t num;
1201
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1202
                    break;
1203
                track->uid = num;
1204
                break;
1205
            }
1206

    
1207
            /* track type (video, audio, combined, subtitle, etc.) */
1208
            case MATROSKA_ID_TRACKTYPE: {
1209
                uint64_t num;
1210
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
1211
                    break;
1212
                if (track->type && track->type != num) {
1213
                    av_log(matroska->ctx, AV_LOG_INFO,
1214
                           "More than one tracktype in an entry - skip\n");
1215
                    break;
1216
                }
1217
                track->type = num;
1218

    
1219
                switch (track->type) {
1220
                    case MATROSKA_TRACK_TYPE_VIDEO:
1221
                    case MATROSKA_TRACK_TYPE_AUDIO:
1222
                    case MATROSKA_TRACK_TYPE_SUBTITLE:
1223
                        break;
1224
                    case MATROSKA_TRACK_TYPE_COMPLEX:
1225
                    case MATROSKA_TRACK_TYPE_LOGO:
1226
                    case MATROSKA_TRACK_TYPE_CONTROL:
1227
                    default:
1228
                        av_log(matroska->ctx, AV_LOG_INFO,
1229
                               "Unknown or unsupported track type 0x%x\n",
1230
                               track->type);
1231
                        track->type = 0;
1232
                        break;
1233
                }
1234
                matroska->tracks[matroska->num_tracks - 1] = track;
1235
                break;
1236
            }
1237

    
1238
            /* tracktype specific stuff for video */
1239
            case MATROSKA_ID_TRACKVIDEO: {
1240
                MatroskaVideoTrack *videotrack;
1241
                if (!track->type)
1242
                    track->type = MATROSKA_TRACK_TYPE_VIDEO;
1243
                if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
1244
                    av_log(matroska->ctx, AV_LOG_INFO,
1245
                           "video data in non-video track - ignoring\n");
1246
                    res = AVERROR_INVALIDDATA;
1247
                    break;
1248
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1249
                    break;
1250
                videotrack = (MatroskaVideoTrack *)track;
1251

    
1252
                while (res == 0) {
1253
                    if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
1254
                        res = AVERROR_IO;
1255
                        break;
1256
                    } else if (matroska->level_up > 0) {
1257
                        matroska->level_up--;
1258
                        break;
1259
                    }
1260

    
1261
                    switch (id) {
1262
                        /* fixme, this should be one-up, but I get it here */
1263
                        case MATROSKA_ID_TRACKDEFAULTDURATION: {
1264
                            uint64_t num;
1265
                            if ((res = ebml_read_uint (matroska, &id,
1266
                                                       &num)) < 0)
1267
                                break;
1268
                            track->default_duration = num;
1269
                            break;
1270
                        }
1271

    
1272
                        /* video framerate */
1273
                        case MATROSKA_ID_VIDEOFRAMERATE: {
1274
                            double num;
1275
                            if ((res = ebml_read_float(matroska, &id,
1276
                                                       &num)) < 0)
1277
                                break;
1278
                            track->default_duration = 1000000000 * (1. / num);
1279
                            break;
1280
                        }
1281

    
1282
                        /* width of the size to display the video at */
1283
                        case MATROSKA_ID_VIDEODISPLAYWIDTH: {
1284
                            uint64_t num;
1285
                            if ((res = ebml_read_uint(matroska, &id,
1286
                                                      &num)) < 0)
1287
                                break;
1288
                            videotrack->display_width = num;
1289
                            break;
1290
                        }
1291

    
1292
                        /* height of the size to display the video at */
1293
                        case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
1294
                            uint64_t num;
1295
                            if ((res = ebml_read_uint(matroska, &id,
1296
                                                      &num)) < 0)
1297
                                break;
1298
                            videotrack->display_height = num;
1299
                            break;
1300
                        }
1301

    
1302
                        /* width of the video in the file */
1303
                        case MATROSKA_ID_VIDEOPIXELWIDTH: {
1304
                            uint64_t num;
1305
                            if ((res = ebml_read_uint(matroska, &id,
1306
                                                      &num)) < 0)
1307
                                break;
1308
                            videotrack->pixel_width = num;
1309
                            break;
1310
                        }
1311

    
1312
                        /* height of the video in the file */
1313
                        case MATROSKA_ID_VIDEOPIXELHEIGHT: {
1314
                            uint64_t num;
1315
                            if ((res = ebml_read_uint(matroska, &id,
1316
                                                      &num)) < 0)
1317
                                break;
1318
                            videotrack->pixel_height = num;
1319
                            break;
1320
                        }
1321

    
1322
                        /* whether the video is interlaced */
1323
                        case MATROSKA_ID_VIDEOFLAGINTERLACED: {
1324
                            uint64_t num;
1325
                            if ((res = ebml_read_uint(matroska, &id,
1326
                                                      &num)) < 0)
1327
                                break;
1328
                            if (num)
1329
                                track->flags |=
1330
                                    MATROSKA_VIDEOTRACK_INTERLACED;
1331
                            else
1332
                                track->flags &=
1333
                                    ~MATROSKA_VIDEOTRACK_INTERLACED;
1334
                            break;
1335
                        }
1336

    
1337
                        /* stereo mode (whether the video has two streams,
1338
                         * where one is for the left eye and the other for
1339
                         * the right eye, which creates a 3D-like
1340
                         * effect) */
1341
                        case MATROSKA_ID_VIDEOSTEREOMODE: {
1342
                            uint64_t num;
1343
                            if ((res = ebml_read_uint(matroska, &id,
1344
                                                      &num)) < 0)
1345
                                break;
1346
                            if (num != MATROSKA_EYE_MODE_MONO &&
1347
                                num != MATROSKA_EYE_MODE_LEFT &&
1348
                                num != MATROSKA_EYE_MODE_RIGHT &&
1349
                                num != MATROSKA_EYE_MODE_BOTH) {
1350
                                av_log(matroska->ctx, AV_LOG_INFO,
1351
                                       "Ignoring unknown eye mode 0x%x\n",
1352
                                       (uint32_t) num);
1353
                                break;
1354
                            }
1355
                            videotrack->eye_mode = num;
1356
                            break;
1357
                        }
1358

    
1359
                        /* aspect ratio behaviour */
1360
                        case MATROSKA_ID_VIDEOASPECTRATIO: {
1361
                            uint64_t num;
1362
                            if ((res = ebml_read_uint(matroska, &id,
1363
                                                      &num)) < 0)
1364
                                break;
1365
                            if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
1366
                                num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
1367
                                num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
1368
                                av_log(matroska->ctx, AV_LOG_INFO,
1369
                                       "Ignoring unknown aspect ratio 0x%x\n",
1370
                                       (uint32_t) num);
1371
                                break;
1372
                            }
1373
                            videotrack->ar_mode = num;
1374
                            break;
1375
                        }
1376

    
1377
                        /* colourspace (only matters for raw video)
1378
                         * fourcc */
1379
                        case MATROSKA_ID_VIDEOCOLOURSPACE: {
1380
                            uint64_t num;
1381
                            if ((res = ebml_read_uint(matroska, &id,
1382
                                                      &num)) < 0)
1383
                                break;
1384
                            videotrack->fourcc = num;
1385
                            break;
1386
                        }
1387

    
1388
                        default:
1389
                            av_log(matroska->ctx, AV_LOG_INFO,
1390
                                   "Unknown video track header entry "
1391
                                   "0x%x - ignoring\n", id);
1392
                            /* pass-through */
1393

    
1394
                        case EBML_ID_VOID:
1395
                            res = ebml_read_skip(matroska);
1396
                            break;
1397
                    }
1398

    
1399
                    if (matroska->level_up) {
1400
                        matroska->level_up--;
1401
                        break;
1402
                    }
1403
                }
1404
                break;
1405
            }
1406

    
1407
            /* tracktype specific stuff for audio */
1408
            case MATROSKA_ID_TRACKAUDIO: {
1409
                MatroskaAudioTrack *audiotrack;
1410
                if (!track->type)
1411
                    track->type = MATROSKA_TRACK_TYPE_AUDIO;
1412
                if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
1413
                    av_log(matroska->ctx, AV_LOG_INFO,
1414
                           "audio data in non-audio track - ignoring\n");
1415
                    res = AVERROR_INVALIDDATA;
1416
                    break;
1417
                } else if ((res = ebml_read_master(matroska, &id)) < 0)
1418
                    break;
1419
                audiotrack = (MatroskaAudioTrack *)track;
1420
                audiotrack->channels = 1;
1421
                audiotrack->samplerate = 8000;
1422

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1606
    return res;
1607
}
1608

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

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

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

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

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

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

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

    
1648
    return res;
1649
}
1650

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1755
                            break;
1756

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

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

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

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

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

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

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

    
1806
    return res;
1807
}
1808

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

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

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

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

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

    
1842
    return res;
1843
}
1844

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
1976
                    finish:
1977
                        /* remove dummy level */
1978
                        while (matroska->num_levels) {
1979
                            matroska->num_levels--;
1980
                            length =
1981
                                matroska->levels[matroska->num_levels].length;
1982
                            if (length == (uint64_t)-1)
1983
                                break;
1984
                        }
1985

    
1986
                        /* seek back */
1987
                        if ((res = ebml_read_seek(matroska, before_pos)) < 0)
1988
                            return res;
1989
                        matroska->peek_id = peek_id_cache;
1990
                        matroska->level_up = level_up;
1991
                        break;
1992
                    }
1993

    
1994
                    default:
1995
                        av_log(matroska->ctx, AV_LOG_INFO,
1996
                               "Ignoring seekhead entry for ID=0x%x\n",
1997
                               seek_id);
1998
                        break;
1999
                }
2000

    
2001
                break;
2002
            }
2003

    
2004
            default:
2005
                av_log(matroska->ctx, AV_LOG_INFO,
2006
                       "Unknown seekhead ID 0x%x\n", id);
2007
                /* fall-through */
2008

    
2009
            case EBML_ID_VOID:
2010
                res = ebml_read_skip(matroska);
2011
                break;
2012
        }
2013

    
2014
        if (matroska->level_up) {
2015
            matroska->level_up--;
2016
            break;
2017
        }
2018
    }
2019

    
2020
    return res;
2021
}
2022

    
2023
#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
2024

    
2025
static int
2026
matroska_aac_profile (char *codec_id)
2027
{
2028
    static const char *aac_profiles[] = {
2029
        "MAIN", "LC", "SSR"
2030
    };
2031
    int profile;
2032

    
2033
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
2034
        if (strstr(codec_id, aac_profiles[profile]))
2035
            break;
2036
    return profile + 1;
2037
}
2038

    
2039
static int
2040
matroska_aac_sri (int samplerate)
2041
{
2042
    static const int aac_sample_rates[] = {
2043
        96000, 88200, 64000, 48000, 44100, 32000,
2044
        24000, 22050, 16000, 12000, 11025,  8000,
2045
    };
2046
    int sri;
2047

    
2048
    for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
2049
        if (aac_sample_rates[sri] == samplerate)
2050
            break;
2051
    return sri;
2052
}
2053

    
2054
static int
2055
matroska_read_header (AVFormatContext    *s,
2056
                      AVFormatParameters *ap)
2057
{
2058
    MatroskaDemuxContext *matroska = s->priv_data;
2059
    char *doctype;
2060
    int version, last_level, res = 0;
2061
    uint32_t id;
2062

    
2063
    matroska->ctx = s;
2064

    
2065
    /* First read the EBML header. */
2066
    doctype = NULL;
2067
    if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
2068
        return res;
2069
    if ((doctype == NULL) || strcmp(doctype, "matroska")) {
2070
        av_log(matroska->ctx, AV_LOG_ERROR,
2071
               "Wrong EBML doctype ('%s' != 'matroska').\n",
2072
               doctype ? doctype : "(none)");
2073
        if (doctype)
2074
            av_free(doctype);
2075
        return AVERROR_NOFMT;
2076
    }
2077
    av_free(doctype);
2078
    if (version > 2) {
2079
        av_log(matroska->ctx, AV_LOG_ERROR,
2080
               "Matroska demuxer version 2 too old for file version %d\n",
2081
               version);
2082
        return AVERROR_NOFMT;
2083
    }
2084

    
2085
    /* The next thing is a segment. */
2086
    while (1) {
2087
        if (!(id = ebml_peek_id(matroska, &last_level)))
2088
            return AVERROR_IO;
2089
        if (id == MATROSKA_ID_SEGMENT)
2090
            break;
2091

    
2092
        /* oi! */
2093
        av_log(matroska->ctx, AV_LOG_INFO,
2094
               "Expected a Segment ID (0x%x), but received 0x%x!\n",
2095
               MATROSKA_ID_SEGMENT, id);
2096
        if ((res = ebml_read_skip(matroska)) < 0)
2097
            return res;
2098
    }
2099

    
2100
    /* We now have a Matroska segment.
2101
     * Seeks are from the beginning of the segment,
2102
     * after the segment ID/length. */
2103
    if ((res = ebml_read_master(matroska, &id)) < 0)
2104
        return res;
2105
    matroska->segment_start = url_ftell(&s->pb);
2106

    
2107
    matroska->time_scale = 1000000;
2108
    /* we've found our segment, start reading the different contents in here */
2109
    while (res == 0) {
2110
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2111
            res = AVERROR_IO;
2112
            break;
2113
        } else if (matroska->level_up) {
2114
            matroska->level_up--;
2115
            break;
2116
        }
2117

    
2118
        switch (id) {
2119
            /* stream info */
2120
            case MATROSKA_ID_INFO: {
2121
                if ((res = ebml_read_master(matroska, &id)) < 0)
2122
                    break;
2123
                res = matroska_parse_info(matroska);
2124
                break;
2125
            }
2126

    
2127
            /* track info headers */
2128
            case MATROSKA_ID_TRACKS: {
2129
                if ((res = ebml_read_master(matroska, &id)) < 0)
2130
                    break;
2131
                res = matroska_parse_tracks(matroska);
2132
                break;
2133
            }
2134

    
2135
            /* stream index */
2136
            case MATROSKA_ID_CUES: {
2137
                if (!matroska->index_parsed) {
2138
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2139
                        break;
2140
                    res = matroska_parse_index(matroska);
2141
                } else
2142
                    res = ebml_read_skip(matroska);
2143
                break;
2144
            }
2145

    
2146
            /* metadata */
2147
            case MATROSKA_ID_TAGS: {
2148
                if (!matroska->metadata_parsed) {
2149
                    if ((res = ebml_read_master(matroska, &id)) < 0)
2150
                        break;
2151
                    res = matroska_parse_metadata(matroska);
2152
                } else
2153
                    res = ebml_read_skip(matroska);
2154
                break;
2155
            }
2156

    
2157
            /* file index (if seekable, seek to Cues/Tags to parse it) */
2158
            case MATROSKA_ID_SEEKHEAD: {
2159
                if ((res = ebml_read_master(matroska, &id)) < 0)
2160
                    break;
2161
                res = matroska_parse_seekhead(matroska);
2162
                break;
2163
            }
2164

    
2165
            case MATROSKA_ID_CLUSTER: {
2166
                /* Do not read the master - this will be done in the next
2167
                 * call to matroska_read_packet. */
2168
                res = 1;
2169
                break;
2170
            }
2171

    
2172
            default:
2173
                av_log(matroska->ctx, AV_LOG_INFO,
2174
                       "Unknown matroska file header ID 0x%x\n", id);
2175
            /* fall-through */
2176

    
2177
            case EBML_ID_VOID:
2178
                res = ebml_read_skip(matroska);
2179
                break;
2180
        }
2181

    
2182
        if (matroska->level_up) {
2183
            matroska->level_up--;
2184
            break;
2185
        }
2186
    }
2187

    
2188
    /* Have we found a cluster? */
2189
    if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
2190
        int i, j;
2191
        MatroskaTrack *track;
2192
        AVStream *st;
2193

    
2194
        for (i = 0; i < matroska->num_tracks; i++) {
2195
            enum CodecID codec_id = CODEC_ID_NONE;
2196
            uint8_t *extradata = NULL;
2197
            int extradata_size = 0;
2198
            int extradata_offset = 0;
2199
            track = matroska->tracks[i];
2200

    
2201
            /* libavformat does not really support subtitles.
2202
             * Also apply some sanity checks. */
2203
            if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
2204
                (track->codec_id == NULL))
2205
                continue;
2206

    
2207
            for(j=0; codec_tags[j].str; j++){
2208
                if(!strncmp(codec_tags[j].str, track->codec_id,
2209
                            strlen(codec_tags[j].str))){
2210
                    codec_id= codec_tags[j].id;
2211
                    break;
2212
                }
2213
            }
2214

    
2215
            /* Set the FourCC from the CodecID. */
2216
            /* This is the MS compatibility mode which stores a
2217
             * BITMAPINFOHEADER in the CodecPrivate. */
2218
            if (!strcmp(track->codec_id,
2219
                        MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
2220
                (track->codec_priv_size >= 40) &&
2221
                (track->codec_priv != NULL)) {
2222
                unsigned char *p;
2223

    
2224
                /* Offset of biCompression. Stored in LE. */
2225
                p = (unsigned char *)track->codec_priv + 16;
2226
                ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
2227
                                 (p[2] << 16) | (p[1] << 8) | p[0];
2228
                codec_id = codec_get_id(codec_bmp_tags, ((MatroskaVideoTrack *)track)->fourcc);
2229

    
2230
            }
2231

    
2232
            /* This is the MS compatibility mode which stores a
2233
             * WAVEFORMATEX in the CodecPrivate. */
2234
            else if (!strcmp(track->codec_id,
2235
                             MATROSKA_CODEC_ID_AUDIO_ACM) &&
2236
                (track->codec_priv_size >= 18) &&
2237
                (track->codec_priv != NULL)) {
2238
                unsigned char *p;
2239
                uint16_t tag;
2240

    
2241
                /* Offset of wFormatTag. Stored in LE. */
2242
                p = (unsigned char *)track->codec_priv;
2243
                tag = (p[1] << 8) | p[0];
2244
                codec_id = codec_get_id(codec_wav_tags, tag);
2245

    
2246
            }
2247

    
2248
            else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
2249
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2250
                int profile = matroska_aac_profile(track->codec_id);
2251
                int sri = matroska_aac_sri(audiotrack->internal_samplerate);
2252
                extradata = av_malloc(5);
2253
                if (extradata == NULL)
2254
                    return AVERROR_NOMEM;
2255
                extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
2256
                extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
2257
                if (strstr(track->codec_id, "SBR")) {
2258
                    sri = matroska_aac_sri(audiotrack->samplerate);
2259
                    extradata[2] = 0x56;
2260
                    extradata[3] = 0xE5;
2261
                    extradata[4] = 0x80 | (sri<<3);
2262
                    extradata_size = 5;
2263
                } else {
2264
                    extradata_size = 2;
2265
                }
2266
            }
2267

    
2268
            else if (codec_id == CODEC_ID_TTA) {
2269
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
2270
                ByteIOContext b;
2271
                extradata_size = 30;
2272
                extradata = av_mallocz(extradata_size);
2273
                if (extradata == NULL)
2274
                    return AVERROR_NOMEM;
2275
                init_put_byte(&b, extradata, extradata_size, 1,
2276
                              NULL, NULL, NULL, NULL);
2277
                put_buffer(&b, (uint8_t *) "TTA1", 4);
2278
                put_le16(&b, 1);
2279
                put_le16(&b, audiotrack->channels);
2280
                put_le16(&b, audiotrack->bitdepth);
2281
                put_le32(&b, audiotrack->samplerate);
2282
                put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
2283
            }
2284

    
2285
            else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
2286
                     codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
2287
                extradata_offset = 26;
2288
                track->codec_priv_size -= extradata_offset;
2289
                track->flags |= MATROSKA_TRACK_REAL_V;
2290
            }
2291

    
2292
            if (codec_id == CODEC_ID_NONE) {
2293
                av_log(matroska->ctx, AV_LOG_INFO,
2294
                       "Unknown/unsupported CodecID %s.\n",
2295
                       track->codec_id);
2296
            }
2297

    
2298
            track->stream_index = matroska->num_streams;
2299

    
2300
            matroska->num_streams++;
2301
            st = av_new_stream(s, track->stream_index);
2302
            if (st == NULL)
2303
                return AVERROR_NOMEM;
2304
            av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
2305

    
2306
            st->codec->codec_id = codec_id;
2307

    
2308
            if (track->default_duration)
2309
                av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
2310
                          track->default_duration, 1000000000, 30000);
2311

    
2312
            if(extradata){
2313
                st->codec->extradata = extradata;
2314
                st->codec->extradata_size = extradata_size;
2315
            } else if(track->codec_priv && track->codec_priv_size > 0){
2316
                st->codec->extradata = av_malloc(track->codec_priv_size);
2317
                if(st->codec->extradata == NULL)
2318
                    return AVERROR_NOMEM;
2319
                st->codec->extradata_size = track->codec_priv_size;
2320
                memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
2321
                       track->codec_priv_size);
2322
            }
2323

    
2324
            if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2325
                MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
2326

    
2327
                st->codec->codec_type = CODEC_TYPE_VIDEO;
2328
                st->codec->codec_tag = videotrack->fourcc;
2329
                st->codec->width = videotrack->pixel_width;
2330
                st->codec->height = videotrack->pixel_height;
2331
                if (videotrack->display_width == 0)
2332
                    videotrack->display_width= videotrack->pixel_width;
2333
                if (videotrack->display_height == 0)
2334
                    videotrack->display_height= videotrack->pixel_height;
2335
                av_reduce(&st->codec->sample_aspect_ratio.num,
2336
                          &st->codec->sample_aspect_ratio.den,
2337
                          st->codec->height * videotrack->display_width,
2338
                          st->codec-> width * videotrack->display_height,
2339
                          255);
2340
            } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2341
                MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
2342

    
2343
                st->codec->codec_type = CODEC_TYPE_AUDIO;
2344
                st->codec->sample_rate = audiotrack->samplerate;
2345
                st->codec->channels = audiotrack->channels;
2346
            } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2347
                st->codec->codec_type = CODEC_TYPE_SUBTITLE;
2348
            }
2349

    
2350
            /* What do we do with private data? E.g. for Vorbis. */
2351
        }
2352
        res = 0;
2353
    }
2354

    
2355
    return res;
2356
}
2357

    
2358
static int
2359
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
2360
                            int                   num)
2361
{
2362
    int i;
2363

    
2364
    for (i = 0; i < matroska->num_tracks; i++)
2365
        if (matroska->tracks[i]->num == num)
2366
            return i;
2367

    
2368
    return -1;
2369
}
2370

    
2371
static inline int
2372
rv_offset(uint8_t *data, int slice, int slices)
2373
{
2374
    return AV_RL32(data+8*slice+4) + 8*slices;
2375
}
2376

    
2377
static int
2378
matroska_parse_block(MatroskaDemuxContext *matroska, uint64_t cluster_time,
2379
                     int is_keyframe, int *ptrack, AVPacket **ppkt)
2380
{
2381
    int res;
2382
    uint32_t id;
2383
    int track;
2384
    AVPacket *pkt;
2385
    uint8_t *data, *origdata;
2386
    int size;
2387
    int16_t block_time;
2388
    uint32_t *lace_size = NULL;
2389
    int n, flags, laces = 0;
2390
    uint64_t num;
2391
    int64_t pos= url_ftell(&matroska->ctx->pb);
2392

    
2393
    if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
2394
        return res;
2395
    origdata = data;
2396

    
2397
    /* first byte(s): tracknum */
2398
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
2399
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
2400
        av_free(origdata);
2401
        return res;
2402
    }
2403
    data += n;
2404
    size -= n;
2405

    
2406
    /* fetch track from num */
2407
    track = matroska_find_track_by_num(matroska, num);
2408
    if (ptrack)  *ptrack = track;
2409
    if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
2410
        av_log(matroska->ctx, AV_LOG_INFO,
2411
               "Invalid stream %d or size %u\n", track, size);
2412
        av_free(origdata);
2413
        return res;
2414
    }
2415
    if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){
2416
        av_free(origdata);
2417
        return res;
2418
    }
2419

    
2420
    /* block_time (relative to cluster time) */
2421
    block_time = (data[0] << 8) | data[1];
2422
    data += 2;
2423
    size -= 2;
2424
    flags = *data;
2425
    data += 1;
2426
    size -= 1;
2427
    if (is_keyframe == -1)
2428
        is_keyframe = flags & 1 ? PKT_FLAG_KEY : 0;
2429
    switch ((flags & 0x06) >> 1) {
2430
        case 0x0: /* no lacing */
2431
            laces = 1;
2432
            lace_size = av_mallocz(sizeof(int));
2433
            lace_size[0] = size;
2434
            break;
2435

    
2436
        case 0x1: /* xiph lacing */
2437
        case 0x2: /* fixed-size lacing */
2438
        case 0x3: /* EBML lacing */
2439
            if (size == 0) {
2440
                res = -1;
2441
                break;
2442
            }
2443
            laces = (*data) + 1;
2444
            data += 1;
2445
            size -= 1;
2446
            lace_size = av_mallocz(laces * sizeof(int));
2447

    
2448
            switch ((flags & 0x06) >> 1) {
2449
                case 0x1: /* xiph lacing */ {
2450
                    uint8_t temp;
2451
                    uint32_t total = 0;
2452
                    for (n = 0; res == 0 && n < laces - 1; n++) {
2453
                        while (1) {
2454
                            if (size == 0) {
2455
                                res = -1;
2456
                                break;
2457
                            }
2458
                            temp = *data;
2459
                            lace_size[n] += temp;
2460
                            data += 1;
2461
                            size -= 1;
2462
                            if (temp != 0xff)
2463
                                break;
2464
                        }
2465
                        total += lace_size[n];
2466
                    }
2467
                    lace_size[n] = size - total;
2468
                    break;
2469
                }
2470

    
2471
                case 0x2: /* fixed-size lacing */
2472
                    for (n = 0; n < laces; n++)
2473
                        lace_size[n] = size / laces;
2474
                    break;
2475

    
2476
                case 0x3: /* EBML lacing */ {
2477
                    uint32_t total;
2478
                    n = matroska_ebmlnum_uint(data, size, &num);
2479
                    if (n < 0) {
2480
                        av_log(matroska->ctx, AV_LOG_INFO,
2481
                               "EBML block data error\n");
2482
                        break;
2483
                    }
2484
                    data += n;
2485
                    size -= n;
2486
                    total = lace_size[0] = num;
2487
                    for (n = 1; res == 0 && n < laces - 1; n++) {
2488
                        int64_t snum;
2489
                        int r;
2490
                        r = matroska_ebmlnum_sint (data, size, &snum);
2491
                        if (r < 0) {
2492
                            av_log(matroska->ctx, AV_LOG_INFO,
2493
                                   "EBML block data error\n");
2494
                            break;
2495
                        }
2496
                        data += r;
2497
                        size -= r;
2498
                        lace_size[n] = lace_size[n - 1] + snum;
2499
                        total += lace_size[n];
2500
                    }
2501
                    lace_size[n] = size - total;
2502
                    break;
2503
                }
2504
            }
2505
            break;
2506
    }
2507

    
2508
    if (res == 0) {
2509
        int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
2510
        for (n = 0; n < laces; n++) {
2511
            uint64_t timecode = AV_NOPTS_VALUE;
2512
            int slice, slices = 1;
2513

    
2514
            if (real_v) {
2515
                slices = *data++ + 1;
2516
                lace_size[n]--;
2517
            }
2518
            if (cluster_time != (uint64_t)-1 && n == 0) {
2519
                if (cluster_time + block_time >= 0)
2520
                    timecode = (cluster_time + block_time) * matroska->time_scale;
2521
            }
2522
            /* FIXME: duration */
2523

    
2524
            for (slice=0; slice<slices; slice++) {
2525
                int slice_size, slice_offset = 0;
2526
                if (real_v)
2527
                    slice_offset = rv_offset(data, slice, slices);
2528
                if (slice+1 == slices)
2529
                    slice_size = lace_size[n] - slice_offset;
2530
                else
2531
                    slice_size = rv_offset(data, slice+1, slices) - slice_offset;
2532
                pkt = av_mallocz(sizeof(AVPacket));
2533
                if (ppkt)  *ppkt = pkt;
2534
                /* XXX: prevent data copy... */
2535
                if (av_new_packet(pkt, slice_size) < 0) {
2536
                    res = AVERROR_NOMEM;
2537
                    n = laces-1;
2538
                    break;
2539
                }
2540
                memcpy (pkt->data, data+slice_offset, slice_size);
2541

    
2542
                if (n == 0)
2543
                    pkt->flags = is_keyframe;
2544
                pkt->stream_index = matroska->tracks[track]->stream_index;
2545

    
2546
                pkt->pts = timecode;
2547
                pkt->pos = pos;
2548

    
2549
                matroska_queue_packet(matroska, pkt);
2550
            }
2551
            data += lace_size[n];
2552
        }
2553
    }
2554

    
2555
    av_free(lace_size);
2556
    av_free(origdata);
2557
    return res;
2558
}
2559

    
2560
static int
2561
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
2562
                           uint64_t              cluster_time)
2563
{
2564
    int res = 0;
2565
    uint32_t id;
2566
    AVPacket *pkt = NULL;
2567
    int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
2568
    uint64_t duration = AV_NOPTS_VALUE;
2569
    int track = -1;
2570

    
2571
    av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
2572

    
2573
    while (res == 0) {
2574
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2575
            res = AVERROR_IO;
2576
            break;
2577
        } else if (matroska->level_up) {
2578
            matroska->level_up--;
2579
            break;
2580
        }
2581

    
2582
        switch (id) {
2583
            /* one block inside the group. Note, block parsing is one
2584
             * of the harder things, so this code is a bit complicated.
2585
             * See http://www.matroska.org/ for documentation. */
2586
            case MATROSKA_ID_BLOCK: {
2587
                res = matroska_parse_block(matroska, cluster_time,
2588
                                           is_keyframe, &track, &pkt);
2589
                break;
2590
            }
2591

    
2592
            case MATROSKA_ID_BLOCKDURATION: {
2593
                if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
2594
                    break;
2595
                break;
2596
            }
2597

    
2598
            case MATROSKA_ID_BLOCKREFERENCE:
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
                res = ebml_read_skip(matroska);
2605
                break;
2606

    
2607
            default:
2608
                av_log(matroska->ctx, AV_LOG_INFO,
2609
                       "Unknown entry 0x%x in blockgroup data\n", id);
2610
                /* fall-through */
2611

    
2612
            case EBML_ID_VOID:
2613
                res = ebml_read_skip(matroska);
2614
                break;
2615
        }
2616

    
2617
        if (matroska->level_up) {
2618
            matroska->level_up--;
2619
            break;
2620
        }
2621
    }
2622

    
2623
    if (pkt)
2624
    {
2625
        if (duration != AV_NOPTS_VALUE)
2626
            pkt->duration = duration;
2627
        else if (track >= 0 && track < matroska->num_tracks)
2628
            pkt->duration = matroska->tracks[track]->default_duration / matroska->time_scale;
2629
    }
2630

    
2631
    return res;
2632
}
2633

    
2634
static int
2635
matroska_parse_cluster (MatroskaDemuxContext *matroska)
2636
{
2637
    int res = 0;
2638
    uint32_t id;
2639
    uint64_t cluster_time = 0;
2640

    
2641
    av_log(matroska->ctx, AV_LOG_DEBUG,
2642
           "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
2643

    
2644
    while (res == 0) {
2645
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2646
            res = AVERROR_IO;
2647
            break;
2648
        } else if (matroska->level_up) {
2649
            matroska->level_up--;
2650
            break;
2651
        }
2652

    
2653
        switch (id) {
2654
            /* cluster timecode */
2655
            case MATROSKA_ID_CLUSTERTIMECODE: {
2656
                uint64_t num;
2657
                if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
2658
                    break;
2659
                cluster_time = num;
2660
                break;
2661
            }
2662

    
2663
                /* a group of blocks inside a cluster */
2664
            case MATROSKA_ID_BLOCKGROUP:
2665
                if ((res = ebml_read_master(matroska, &id)) < 0)
2666
                    break;
2667
                res = matroska_parse_blockgroup(matroska, cluster_time);
2668
                break;
2669

    
2670
            case MATROSKA_ID_SIMPLEBLOCK:
2671
                matroska_parse_block(matroska, cluster_time, -1, NULL, NULL);
2672
                break;
2673

    
2674
            default:
2675
                av_log(matroska->ctx, AV_LOG_INFO,
2676
                       "Unknown entry 0x%x in cluster data\n", id);
2677
                /* fall-through */
2678

    
2679
            case EBML_ID_VOID:
2680
                res = ebml_read_skip(matroska);
2681
                break;
2682
        }
2683

    
2684
        if (matroska->level_up) {
2685
            matroska->level_up--;
2686
            break;
2687
        }
2688
    }
2689

    
2690
    return res;
2691
}
2692

    
2693
static int
2694
matroska_read_packet (AVFormatContext *s,
2695
                      AVPacket        *pkt)
2696
{
2697
    MatroskaDemuxContext *matroska = s->priv_data;
2698
    int res = 0;
2699
    uint32_t id;
2700

    
2701
    /* Read stream until we have a packet queued. */
2702
    while (matroska_deliver_packet(matroska, pkt)) {
2703

    
2704
    /* Have we already reached the end? */
2705
    if (matroska->done)
2706
        return AVERROR_IO;
2707

    
2708
    while (res == 0) {
2709
        if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
2710
            return AVERROR_IO;
2711
        } else if (matroska->level_up) {
2712
            matroska->level_up--;
2713
            break;
2714
        }
2715

    
2716
        switch (id) {
2717
            case MATROSKA_ID_CLUSTER:
2718
                if ((res = ebml_read_master(matroska, &id)) < 0)
2719
                    break;
2720
                if ((res = matroska_parse_cluster(matroska)) == 0)
2721
                    res = 1; /* Parsed one cluster, let's get out. */
2722
                break;
2723

    
2724
            default:
2725
            case EBML_ID_VOID:
2726
                res = ebml_read_skip(matroska);
2727
                break;
2728
        }
2729

    
2730
        if (matroska->level_up) {
2731
            matroska->level_up--;
2732
            break;
2733
        }
2734
    }
2735

    
2736
    if (res == -1)
2737
        matroska->done = 1;
2738
    }
2739

    
2740
    return 0;
2741
}
2742

    
2743
static int
2744
matroska_read_close (AVFormatContext *s)
2745
{
2746
    MatroskaDemuxContext *matroska = s->priv_data;
2747
    int n = 0;
2748

    
2749
    av_free(matroska->writing_app);
2750
    av_free(matroska->muxing_app);
2751
    av_free(matroska->index);
2752

    
2753
    if (matroska->packets != NULL) {
2754
        for (n = 0; n < matroska->num_packets; n++) {
2755
            av_free_packet(matroska->packets[n]);
2756
            av_free(matroska->packets[n]);
2757
        }
2758
        av_free(matroska->packets);
2759
    }
2760

    
2761
    for (n = 0; n < matroska->num_tracks; n++) {
2762
        MatroskaTrack *track = matroska->tracks[n];
2763
        av_free(track->codec_id);
2764
        av_free(track->codec_name);
2765
        av_free(track->codec_priv);
2766
        av_free(track->name);
2767
        av_free(track->language);
2768

    
2769
        av_free(track);
2770
    }
2771

    
2772
    return 0;
2773
}
2774

    
2775
AVInputFormat matroska_demuxer = {
2776
    "matroska",
2777
    "Matroska file format",
2778
    sizeof(MatroskaDemuxContext),
2779
    matroska_probe,
2780
    matroska_read_header,
2781
    matroska_read_packet,
2782
    matroska_read_close,
2783
};