2692 lines
86 KiB
C
2692 lines
86 KiB
C
/*
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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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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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_bmp_id and codec_get_wav_id. */
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#include "avi.h"
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/* EBML version supported */
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#define EBML_VERSION 1
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/* 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
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/* general EBML types */
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#define EBML_ID_VOID 0xEC
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/*
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* Matroska element IDs. max. 32-bit.
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*/
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/* toplevel segment */
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#define MATROSKA_ID_SEGMENT 0x18538067
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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_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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/* 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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/* 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_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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/* 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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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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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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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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/*
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* 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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*/
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typedef enum {
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MATROSKA_TRACK_ENABLED = (1<<0),
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MATROSKA_TRACK_DEFAULT = (1<<1),
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MATROSKA_TRACK_LACING = (1<<2),
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MATROSKA_TRACK_SHIFT = (1<<16)
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} MatroskaTrackFlags;
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typedef enum {
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MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0)
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} MatroskaVideoTrackFlags;
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/*
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* Matroska Codec IDs. Strings.
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*/
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#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC "V_MS/VFW/FOURCC"
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#define MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED "V_UNCOMPRESSED"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG4_SP "V_MPEG4/ISO/SP"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP "V_MPEG4/ISO/ASP"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AP "V_MPEG4/ISO/AP"
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#define MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3 "V_MPEG4/MS/V3"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG1 "V_MPEG1"
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#define MATROSKA_CODEC_ID_VIDEO_MPEG2 "V_MPEG2"
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#define MATROSKA_CODEC_ID_VIDEO_MJPEG "V_MJPEG"
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/* TODO: Real/Quicktime */
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#define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L1 "A_MPEG/L1"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2 "A_MPEG/L2"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3 "A_MPEG/L3"
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#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE "A_PCM/INT/BIG"
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#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE "A_PCM/INT/LIT"
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#define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT "A_PCM/FLOAT/IEEE"
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#define MATROSKA_CODEC_ID_AUDIO_AC3 "A_AC3"
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#define MATROSKA_CODEC_ID_AUDIO_DTS "A_DTS"
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#define MATROSKA_CODEC_ID_AUDIO_VORBIS "A_VORBIS"
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#define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG2 "A_AAC/MPEG2/"
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#define MATROSKA_CODEC_ID_AUDIO_MPEG4 "A_AAC/MPEG4/"
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/* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */
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/* max. depth in the EBML tree structure */
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#define EBML_MAX_DEPTH 16
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typedef struct Track {
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MatroskaTrackType type;
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/* Unique track number and track ID. stream_index is the index that
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* the calling app uses for this track. */
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uint32_t num,
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uid,
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stream_index;
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char *name,
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*language;
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char *codec_id,
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*codec_name;
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unsigned char *codec_priv;
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int codec_priv_size;
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int64_t default_duration;
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MatroskaTrackFlags flags;
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} MatroskaTrack;
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typedef struct MatroskaVideoTrack {
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MatroskaTrack track;
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int pixel_width,
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pixel_height,
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display_width,
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display_height;
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uint32_t fourcc;
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MatroskaAspectRatioMode ar_mode;
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MatroskaEyeMode eye_mode;
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//..
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} MatroskaVideoTrack;
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typedef struct MatroskaAudioTrack {
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MatroskaTrack track;
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int channels,
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bitdepth,
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samplerate;
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//..
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} MatroskaAudioTrack;
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typedef struct MatroskaSubtitleTrack {
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MatroskaTrack track;
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//..
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} MatroskaSubtitleTrack;
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typedef struct MatroskaLevel {
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uint64_t start, length;
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} MatroskaLevel;
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typedef struct MatroskaDemuxIndex {
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uint64_t pos; /* of the corresponding *cluster*! */
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uint16_t track; /* reference to 'num' */
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uint64_t time; /* in nanoseconds */
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} MatroskaDemuxIndex;
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typedef struct MatroskaDemuxContext {
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AVFormatContext *ctx;
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/* ebml stuff */
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int num_levels;
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MatroskaLevel levels[EBML_MAX_DEPTH];
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int level_up;
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/* matroska stuff */
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char *writing_app,
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*muxing_app;
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int64_t created;
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/* timescale in the file */
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int64_t time_scale;
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/* length, position (time, ns) */
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int64_t duration,
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pos;
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/* num_streams is the number of streams that av_new_stream() was called
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* for ( = that are available to the calling program). */
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int num_tracks, num_streams;
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MatroskaTrack *tracks[MAX_STREAMS];
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/* cache for ID peeking */
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uint32_t peek_id;
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/* byte position of the segment inside the stream */
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offset_t segment_start;
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/* The packet queue. */
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AVPacket **packets;
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int num_packets;
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/* have we already parse metadata/cues/clusters? */
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int metadata_parsed,
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index_parsed,
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done;
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/* The index for seeking. */
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int num_indexes;
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MatroskaDemuxIndex *index;
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} MatroskaDemuxContext;
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/*
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* The first few functions handle EBML file parsing. The rest
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* is the document interpretation. Matroska really just is a
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* EBML file.
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*/
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/*
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* Return: the amount of levels in the hierarchy that the
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* current element lies higher than the previous one.
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* The opposite isn't done - that's auto-done using master
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* element reading.
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*/
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static int
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ebml_read_element_level_up (MatroskaDemuxContext *matroska)
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{
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ByteIOContext *pb = &matroska->ctx->pb;
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offset_t pos = url_ftell(pb);
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int num = 0;
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while (matroska->num_levels > 0) {
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MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
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if (pos >= level->start + level->length) {
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matroska->num_levels--;
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num++;
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} else {
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break;
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}
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}
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return num;
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}
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/*
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* Read: an "EBML number", which is defined as a variable-length
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* array of bytes. The first byte indicates the length by giving a
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* number of 0-bits followed by a one. The position of the first
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* "one" bit inside the first byte indicates the length of this
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* number.
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* Returns: num. of bytes read. < 0 on error.
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*/
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static int
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ebml_read_num (MatroskaDemuxContext *matroska,
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int max_size,
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uint64_t *number)
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{
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ByteIOContext *pb = &matroska->ctx->pb;
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int len_mask = 0x80, read = 1, n = 1;
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int64_t total = 0;
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/* the first byte tells us the length in bytes - get_byte() can normally
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* return 0, but since that's not a valid first ebmlID byte, we can
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* use it safely here to catch EOS. */
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if (!(total = get_byte(pb))) {
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/* we might encounter EOS here */
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if (!url_feof(pb)) {
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offset_t pos = url_ftell(pb);
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av_log(matroska->ctx, AV_LOG_ERROR,
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"Read error at pos. %llu (0x%llx)\n",
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pos, pos);
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}
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return AVERROR_IO; /* EOS or actual I/O error */
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}
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/* get the length of the EBML number */
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while (read <= max_size && !(total & len_mask)) {
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read++;
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len_mask >>= 1;
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}
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if (read > max_size) {
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offset_t pos = url_ftell(pb) - 1;
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av_log(matroska->ctx, AV_LOG_ERROR,
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"Invalid EBML number size tag 0x%02x at pos %llu (0x%llx)\n",
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(uint8_t) total, pos, pos);
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return AVERROR_INVALIDDATA;
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}
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/* read out length */
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total &= ~len_mask;
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while (n++ < read)
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total = (total << 8) | get_byte(pb);
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*number = total;
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return read;
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}
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/*
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* Read: the element content data ID.
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* Return: the number of bytes read or < 0 on error.
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*/
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static int
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ebml_read_element_id (MatroskaDemuxContext *matroska,
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uint32_t *id,
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int *level_up)
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{
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int read;
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uint64_t total;
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/* if we re-call this, use our cached ID */
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if (matroska->peek_id != 0) {
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if (level_up)
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*level_up = 0;
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*id = matroska->peek_id;
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return 0;
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}
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/* read out the "EBML number", include tag in ID */
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if ((read = ebml_read_num(matroska, 4, &total)) < 0)
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return read;
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*id = matroska->peek_id = total | (1 << (read * 7));
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/* level tracking */
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if (level_up)
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*level_up = ebml_read_element_level_up(matroska);
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return read;
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}
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/*
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* Read: element content length.
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* Return: the number of bytes read or < 0 on error.
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*/
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static int
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ebml_read_element_length (MatroskaDemuxContext *matroska,
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uint64_t *length)
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{
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/* clear cache since we're now beyond that data point */
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matroska->peek_id = 0;
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/* read out the "EBML number", include tag in ID */
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return ebml_read_num(matroska, 8, length);
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}
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/*
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* Return: the ID of the next element, or 0 on error.
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* Level_up contains the amount of levels that this
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* next element lies higher than the previous one.
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*/
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static uint32_t
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ebml_peek_id (MatroskaDemuxContext *matroska,
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int *level_up)
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{
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uint32_t id;
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assert(level_up != NULL);
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if (ebml_read_element_id(matroska, &id, level_up) < 0)
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return 0;
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return id;
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}
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/*
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* Seek to a given offset.
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* 0 is success, -1 is failure.
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*/
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static int
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ebml_read_seek (MatroskaDemuxContext *matroska,
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offset_t offset)
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{
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ByteIOContext *pb = &matroska->ctx->pb;
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/* clear ID cache, if any */
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matroska->peek_id = 0;
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return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
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}
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/*
|
|
* Skip the next element.
|
|
* 0 is success, -1 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_skip (MatroskaDemuxContext *matroska)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
uint32_t id;
|
|
uint64_t length;
|
|
int res;
|
|
|
|
if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &length)) < 0)
|
|
return res;
|
|
|
|
url_fskip(pb, length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as an unsigned int.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_uint (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
uint64_t *num)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
int n = 0, size, res;
|
|
uint64_t rlength;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &rlength)) < 0)
|
|
return res;
|
|
size = rlength;
|
|
if (size < 1 || size > 8) {
|
|
offset_t pos = url_ftell(pb);
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Invalid uint element size %d at position %lld (0x%llx)\n",
|
|
size, pos, pos);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* big-endian ordening; build up number */
|
|
*num = 0;
|
|
while (n++ < size)
|
|
*num = (*num << 8) | get_byte(pb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as a signed int.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_sint (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
int64_t *num)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
int size, n = 1, negative = 0, res;
|
|
uint64_t rlength;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &rlength)) < 0)
|
|
return res;
|
|
size = rlength;
|
|
if (size < 1 || size > 8) {
|
|
offset_t pos = url_ftell(pb);
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Invalid sint element size %d at position %lld (0x%llx)\n",
|
|
size, pos, pos);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if ((*num = get_byte(pb)) & 0x80) {
|
|
negative = 1;
|
|
*num &= ~0x80;
|
|
}
|
|
*num = 0;
|
|
while (n++ < size)
|
|
*num = (*num << 8) | get_byte(pb);
|
|
|
|
/* make signed */
|
|
if (negative)
|
|
*num = *num - (1LL << ((8 * size) - 1));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as a float.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_float (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
double *num)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
int size, res;
|
|
uint64_t rlength;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &rlength)) < 0)
|
|
return res;
|
|
size = rlength;
|
|
|
|
if (size != 4 && size != 8 && size != 10) {
|
|
offset_t pos = url_ftell(pb);
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Invalid float element size %d at position %llu (0x%llx)\n",
|
|
size, pos, pos);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (size == 10) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"FIXME! 10-byte floats unimplemented\n");
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
|
|
if (size == 4) {
|
|
float f;
|
|
|
|
while (size-- > 0)
|
|
#ifdef WORDS_BIGENDIAN
|
|
((uint8_t *) &f)[3 - size] = get_byte(pb);
|
|
#else
|
|
((uint8_t *) &f)[size] = get_byte(pb);
|
|
#endif
|
|
|
|
*num = f;
|
|
} else {
|
|
double d;
|
|
|
|
while (size-- > 0)
|
|
#ifdef WORDS_BIGENDIAN
|
|
((uint8_t *) &d)[7 - size] = get_byte(pb);
|
|
#else
|
|
((uint8_t *) &d)[size] = get_byte(pb);
|
|
#endif
|
|
|
|
*num = d;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as an ASCII string.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_ascii (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
char **str)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
int size, res;
|
|
uint64_t rlength;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &rlength)) < 0)
|
|
return res;
|
|
size = rlength;
|
|
|
|
/* ebml strings are usually not 0-terminated, so we allocate one
|
|
* byte more, read the string and NULL-terminate it ourselves. */
|
|
if (!(*str = av_malloc(size + 1))) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
|
|
return AVERROR_NOMEM;
|
|
}
|
|
if (get_buffer(pb, (uint8_t *) *str, size) != size) {
|
|
offset_t pos = url_ftell(pb);
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Read error at pos. %llu (0x%llx)\n", pos, pos);
|
|
return AVERROR_IO;
|
|
}
|
|
(*str)[size] = '\0';
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as a UTF-8 string.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_utf8 (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
char **str)
|
|
{
|
|
return ebml_read_ascii(matroska, id, str);
|
|
}
|
|
|
|
/*
|
|
* Read the next element as a date (nanoseconds since 1/1/2000).
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_date (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
int64_t *date)
|
|
{
|
|
return ebml_read_sint(matroska, id, date);
|
|
}
|
|
|
|
/*
|
|
* Read the next element, but only the header. The contents
|
|
* are supposed to be sub-elements which can be read separately.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_master (MatroskaDemuxContext *matroska,
|
|
uint32_t *id)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
uint64_t length;
|
|
MatroskaLevel *level;
|
|
int res;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &length)) < 0)
|
|
return res;
|
|
|
|
/* protect... (Heaven forbids that the '>' is true) */
|
|
if (matroska->num_levels >= EBML_MAX_DEPTH) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
|
|
return AVERROR_NOTSUPP;
|
|
}
|
|
|
|
/* remember level */
|
|
level = &matroska->levels[matroska->num_levels++];
|
|
level->start = url_ftell(pb);
|
|
level->length = length;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read the next element as binary data.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_binary (MatroskaDemuxContext *matroska,
|
|
uint32_t *id,
|
|
uint8_t **binary,
|
|
int *size)
|
|
{
|
|
ByteIOContext *pb = &matroska->ctx->pb;
|
|
uint64_t rlength;
|
|
int res;
|
|
|
|
if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
|
|
(res = ebml_read_element_length(matroska, &rlength)) < 0)
|
|
return res;
|
|
*size = rlength;
|
|
|
|
if (!(*binary = av_malloc(*size))) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Memory allocation error\n");
|
|
return AVERROR_NOMEM;
|
|
}
|
|
|
|
if (get_buffer(pb, *binary, *size) != *size) {
|
|
offset_t pos = url_ftell(pb);
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Read error at pos. %llu (0x%llx)\n", pos, pos);
|
|
return AVERROR_IO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read signed/unsigned "EBML" numbers.
|
|
* Return: number of bytes processed, < 0 on error.
|
|
* XXX: use ebml_read_num().
|
|
*/
|
|
|
|
static int
|
|
matroska_ebmlnum_uint (uint8_t *data,
|
|
uint32_t size,
|
|
uint64_t *num)
|
|
{
|
|
int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
|
|
uint64_t total;
|
|
|
|
if (size <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
total = data[0];
|
|
while (read <= 8 && !(total & len_mask)) {
|
|
read++;
|
|
len_mask >>= 1;
|
|
}
|
|
if (read > 8)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if ((total &= (len_mask - 1)) == len_mask - 1)
|
|
num_ffs++;
|
|
if (size < read)
|
|
return AVERROR_INVALIDDATA;
|
|
while (n < read) {
|
|
if (data[n] == 0xff)
|
|
num_ffs++;
|
|
total = (total << 8) | data[n];
|
|
n++;
|
|
}
|
|
|
|
if (!total)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (read == num_ffs)
|
|
*num = (uint64_t)-1;
|
|
else
|
|
*num = total;
|
|
|
|
return read;
|
|
}
|
|
|
|
/*
|
|
* Same as above, but signed.
|
|
*/
|
|
|
|
static int
|
|
matroska_ebmlnum_sint (uint8_t *data,
|
|
uint32_t size,
|
|
int64_t *num)
|
|
{
|
|
uint64_t unum;
|
|
int res;
|
|
|
|
/* read as unsigned number first */
|
|
if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
|
|
return res;
|
|
|
|
/* make signed (weird way) */
|
|
if (unum == (uint64_t)-1)
|
|
*num = INT64_MAX;
|
|
else
|
|
*num = unum - ((1LL << ((7 * res) - 1)) - 1);
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Read an EBML header.
|
|
* 0 is success, < 0 is failure.
|
|
*/
|
|
|
|
static int
|
|
ebml_read_header (MatroskaDemuxContext *matroska,
|
|
char **doctype,
|
|
int *version)
|
|
{
|
|
uint32_t id;
|
|
int level_up, res = 0;
|
|
|
|
/* default init */
|
|
if (doctype)
|
|
*doctype = NULL;
|
|
if (version)
|
|
*version = 1;
|
|
|
|
if (!(id = ebml_peek_id(matroska, &level_up)) ||
|
|
level_up != 0 || id != EBML_ID_HEADER) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
return res;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &level_up)))
|
|
return AVERROR_IO;
|
|
|
|
/* end-of-header */
|
|
if (level_up)
|
|
break;
|
|
|
|
switch (id) {
|
|
/* is our read version uptodate? */
|
|
case EBML_ID_EBMLREADVERSION: {
|
|
uint64_t num;
|
|
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
return res;
|
|
if (num > EBML_VERSION) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"EBML version %llu (> %d) is not supported\n",
|
|
num, EBML_VERSION);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* we only handle 8 byte lengths at max */
|
|
case EBML_ID_EBMLMAXSIZELENGTH: {
|
|
uint64_t num;
|
|
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
return res;
|
|
if (num > sizeof(uint64_t)) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Integers of size %llu (> %d) not supported\n",
|
|
num, sizeof(uint64_t));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* we handle 4 byte IDs at max */
|
|
case EBML_ID_EBMLMAXIDLENGTH: {
|
|
uint64_t num;
|
|
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
return res;
|
|
if (num > sizeof(uint32_t)) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"IDs of size %llu (> %u) not supported\n",
|
|
num, sizeof(uint32_t));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case EBML_ID_DOCTYPE: {
|
|
char *text;
|
|
|
|
if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
|
|
return res;
|
|
if (doctype) {
|
|
if (*doctype)
|
|
av_free(*doctype);
|
|
*doctype = text;
|
|
} else
|
|
av_free(text);
|
|
break;
|
|
}
|
|
|
|
case EBML_ID_DOCTYPEREADVERSION: {
|
|
uint64_t num;
|
|
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
return res;
|
|
if (version)
|
|
*version = num;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown data type 0x%x in EBML header", id);
|
|
/* pass-through */
|
|
|
|
case EBML_ID_VOID:
|
|
/* we ignore these two, as they don't tell us anything we
|
|
* care about */
|
|
case EBML_ID_EBMLVERSION:
|
|
case EBML_ID_DOCTYPEVERSION:
|
|
res = ebml_read_skip (matroska);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Put one packet in an application-supplied AVPacket struct.
|
|
* Returns 0 on success or -1 on failure.
|
|
*/
|
|
|
|
static int
|
|
matroska_deliver_packet (MatroskaDemuxContext *matroska,
|
|
AVPacket *pkt)
|
|
{
|
|
if (matroska->num_packets > 0) {
|
|
memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
|
|
av_free(matroska->packets[0]);
|
|
if (matroska->num_packets > 1) {
|
|
memmove(&matroska->packets[0], &matroska->packets[1],
|
|
(matroska->num_packets - 1) * sizeof(AVPacket *));
|
|
matroska->packets =
|
|
av_realloc(matroska->packets, (matroska->num_packets - 1) *
|
|
sizeof(AVPacket *));
|
|
} else {
|
|
av_free(matroska->packets);
|
|
matroska->packets = NULL;
|
|
}
|
|
matroska->num_packets--;
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Put a packet into our internal queue. Will be delivered to the
|
|
* user/application during the next get_packet() call.
|
|
*/
|
|
|
|
static void
|
|
matroska_queue_packet (MatroskaDemuxContext *matroska,
|
|
AVPacket *pkt)
|
|
{
|
|
matroska->packets =
|
|
av_realloc(matroska->packets, (matroska->num_packets + 1) *
|
|
sizeof(AVPacket *));
|
|
matroska->packets[matroska->num_packets] = pkt;
|
|
matroska->num_packets++;
|
|
}
|
|
|
|
/*
|
|
* Autodetecting...
|
|
*/
|
|
|
|
static int
|
|
matroska_probe (AVProbeData *p)
|
|
{
|
|
uint64_t total = 0;
|
|
int len_mask = 0x80, size = 1, n = 1;
|
|
uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
|
|
|
|
if (p->buf_size < 5)
|
|
return 0;
|
|
|
|
/* ebml header? */
|
|
if ((p->buf[0] << 24 | p->buf[1] << 16 |
|
|
p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
|
|
return 0;
|
|
|
|
/* length of header */
|
|
total = p->buf[4];
|
|
while (size <= 8 && !(total & len_mask)) {
|
|
size++;
|
|
len_mask >>= 1;
|
|
}
|
|
if (size > 8)
|
|
return 0;
|
|
total &= (len_mask - 1);
|
|
while (n < size)
|
|
total = (total << 8) | p->buf[4 + n++];
|
|
|
|
/* does the probe data contain the whole header? */
|
|
if (p->buf_size < 4 + size + total)
|
|
return 0;
|
|
|
|
/* the header must contain the document type 'matroska'. For now,
|
|
* we don't parse the whole header but simply check for the
|
|
* availability of that array of characters inside the header.
|
|
* Not fully fool-proof, but good enough. */
|
|
for (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++)
|
|
if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* From here on, it's all XML-style DTD stuff... Needs no comments.
|
|
*/
|
|
|
|
static int
|
|
matroska_parse_info (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* cluster timecode */
|
|
case MATROSKA_ID_TIMECODESCALE: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
matroska->time_scale = num;
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_DURATION: {
|
|
double num;
|
|
if ((res = ebml_read_float(matroska, &id, &num)) < 0)
|
|
break;
|
|
matroska->duration = num * matroska->time_scale;
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_WRITINGAPP: {
|
|
char *text;
|
|
if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
|
|
break;
|
|
matroska->writing_app = text;
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_MUXINGAPP: {
|
|
char *text;
|
|
if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
|
|
break;
|
|
matroska->muxing_app = text;
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_DATEUTC: {
|
|
int64_t time;
|
|
if ((res = ebml_read_date(matroska, &id, &time)) < 0)
|
|
break;
|
|
matroska->created = time;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in info header\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_add_stream (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
MatroskaTrack *track;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
|
|
|
|
/* Allocate a generic track. As soon as we know its type we'll realloc. */
|
|
track = av_mallocz(sizeof(MatroskaTrack));
|
|
matroska->num_tracks++;
|
|
|
|
/* start with the master */
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
return res;
|
|
|
|
/* try reading the trackentry headers */
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up > 0) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* track number (unique stream ID) */
|
|
case MATROSKA_ID_TRACKNUMBER: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
track->num = num;
|
|
break;
|
|
}
|
|
|
|
/* track UID (unique identifier) */
|
|
case MATROSKA_ID_TRACKUID: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
track->uid = num;
|
|
break;
|
|
}
|
|
|
|
/* track type (video, audio, combined, subtitle, etc.) */
|
|
case MATROSKA_ID_TRACKTYPE: {
|
|
uint64_t num;
|
|
if (track->type != 0) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"More than one tracktype in an entry - skip\n");
|
|
break;
|
|
}
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
track->type = num;
|
|
|
|
/* ok, so we're actually going to reallocate this thing */
|
|
switch (track->type) {
|
|
case MATROSKA_TRACK_TYPE_VIDEO:
|
|
track = (MatroskaTrack *)
|
|
av_realloc(track, sizeof(MatroskaVideoTrack));
|
|
break;
|
|
case MATROSKA_TRACK_TYPE_AUDIO:
|
|
track = (MatroskaTrack *)
|
|
av_realloc(track, sizeof(MatroskaAudioTrack));
|
|
((MatroskaAudioTrack *)track)->channels = 1;
|
|
((MatroskaAudioTrack *)track)->samplerate = 8000;
|
|
break;
|
|
case MATROSKA_TRACK_TYPE_SUBTITLE:
|
|
track = (MatroskaTrack *)
|
|
av_realloc(track, sizeof(MatroskaSubtitleTrack));
|
|
break;
|
|
case MATROSKA_TRACK_TYPE_COMPLEX:
|
|
case MATROSKA_TRACK_TYPE_LOGO:
|
|
case MATROSKA_TRACK_TYPE_CONTROL:
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown or unsupported track type 0x%x\n",
|
|
track->type);
|
|
track->type = 0;
|
|
break;
|
|
}
|
|
matroska->tracks[matroska->num_tracks - 1] = track;
|
|
break;
|
|
}
|
|
|
|
/* tracktype specific stuff for video */
|
|
case MATROSKA_ID_TRACKVIDEO: {
|
|
MatroskaVideoTrack *videotrack;
|
|
if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"video data in non-video track - ignoring\n");
|
|
res = AVERROR_INVALIDDATA;
|
|
break;
|
|
} else if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
videotrack = (MatroskaVideoTrack *)track;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up > 0) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* fixme, this should be one-up, but I get it here */
|
|
case MATROSKA_ID_TRACKDEFAULTDURATION: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint (matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
track->default_duration = num;
|
|
break;
|
|
}
|
|
|
|
/* video framerate */
|
|
case MATROSKA_ID_VIDEOFRAMERATE: {
|
|
double num;
|
|
if ((res = ebml_read_float(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
track->default_duration = 1000000000 * (1. / num);
|
|
break;
|
|
}
|
|
|
|
/* width of the size to display the video at */
|
|
case MATROSKA_ID_VIDEODISPLAYWIDTH: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
videotrack->display_width = num;
|
|
break;
|
|
}
|
|
|
|
/* height of the size to display the video at */
|
|
case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
videotrack->display_height = num;
|
|
break;
|
|
}
|
|
|
|
/* width of the video in the file */
|
|
case MATROSKA_ID_VIDEOPIXELWIDTH: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
videotrack->pixel_width = num;
|
|
break;
|
|
}
|
|
|
|
/* height of the video in the file */
|
|
case MATROSKA_ID_VIDEOPIXELHEIGHT: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
videotrack->pixel_height = num;
|
|
break;
|
|
}
|
|
|
|
/* whether the video is interlaced */
|
|
case MATROSKA_ID_VIDEOFLAGINTERLACED: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
if (num)
|
|
track->flags |=
|
|
MATROSKA_VIDEOTRACK_INTERLACED;
|
|
else
|
|
track->flags &=
|
|
~MATROSKA_VIDEOTRACK_INTERLACED;
|
|
break;
|
|
}
|
|
|
|
/* stereo mode (whether the video has two streams,
|
|
* where one is for the left eye and the other for
|
|
* the right eye, which creates a 3D-like
|
|
* effect) */
|
|
case MATROSKA_ID_VIDEOSTEREOMODE: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
if (num != MATROSKA_EYE_MODE_MONO &&
|
|
num != MATROSKA_EYE_MODE_LEFT &&
|
|
num != MATROSKA_EYE_MODE_RIGHT &&
|
|
num != MATROSKA_EYE_MODE_BOTH) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Ignoring unknown eye mode 0x%x\n",
|
|
(uint32_t) num);
|
|
break;
|
|
}
|
|
videotrack->eye_mode = num;
|
|
break;
|
|
}
|
|
|
|
/* aspect ratio behaviour */
|
|
case MATROSKA_ID_VIDEOASPECTRATIO: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
|
|
num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
|
|
num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Ignoring unknown aspect ratio 0x%x\n",
|
|
(uint32_t) num);
|
|
break;
|
|
}
|
|
videotrack->ar_mode = num;
|
|
break;
|
|
}
|
|
|
|
/* colourspace (only matters for raw video)
|
|
* fourcc */
|
|
case MATROSKA_ID_VIDEOCOLOURSPACE: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
videotrack->fourcc = num;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown video track header entry "
|
|
"0x%x - ignoring\n", id);
|
|
/* pass-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* tracktype specific stuff for audio */
|
|
case MATROSKA_ID_TRACKAUDIO: {
|
|
MatroskaAudioTrack *audiotrack;
|
|
if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"audio data in non-audio track - ignoring\n");
|
|
res = AVERROR_INVALIDDATA;
|
|
break;
|
|
} else if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
audiotrack = (MatroskaAudioTrack *)track;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up > 0) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* samplerate */
|
|
case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
|
|
double num;
|
|
if ((res = ebml_read_float(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
audiotrack->samplerate = num;
|
|
break;
|
|
}
|
|
|
|
/* bitdepth */
|
|
case MATROSKA_ID_AUDIOBITDEPTH: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
audiotrack->bitdepth = num;
|
|
break;
|
|
}
|
|
|
|
/* channels */
|
|
case MATROSKA_ID_AUDIOCHANNELS: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&num)) < 0)
|
|
break;
|
|
audiotrack->channels = num;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown audio track header entry "
|
|
"0x%x - ignoring\n", id);
|
|
/* pass-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* codec identifier */
|
|
case MATROSKA_ID_CODECID: {
|
|
char *text;
|
|
if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
|
|
break;
|
|
track->codec_id = text;
|
|
break;
|
|
}
|
|
|
|
/* codec private data */
|
|
case MATROSKA_ID_CODECPRIVATE: {
|
|
uint8_t *data;
|
|
int size;
|
|
if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
|
|
break;
|
|
track->codec_priv = data;
|
|
track->codec_priv_size = size;
|
|
break;
|
|
}
|
|
|
|
/* name of the codec */
|
|
case MATROSKA_ID_CODECNAME: {
|
|
char *text;
|
|
if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
|
|
break;
|
|
track->codec_name = text;
|
|
break;
|
|
}
|
|
|
|
/* name of this track */
|
|
case MATROSKA_ID_TRACKNAME: {
|
|
char *text;
|
|
if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
|
|
break;
|
|
track->name = text;
|
|
break;
|
|
}
|
|
|
|
/* language (matters for audio/subtitles, mostly) */
|
|
case MATROSKA_ID_TRACKLANGUAGE: {
|
|
char *text;
|
|
if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
|
|
break;
|
|
track->language = text;
|
|
break;
|
|
}
|
|
|
|
/* whether this is actually used */
|
|
case MATROSKA_ID_TRACKFLAGENABLED: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
if (num)
|
|
track->flags |= MATROSKA_TRACK_ENABLED;
|
|
else
|
|
track->flags &= ~MATROSKA_TRACK_ENABLED;
|
|
break;
|
|
}
|
|
|
|
/* whether it's the default for this track type */
|
|
case MATROSKA_ID_TRACKFLAGDEFAULT: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
if (num)
|
|
track->flags |= MATROSKA_TRACK_DEFAULT;
|
|
else
|
|
track->flags &= ~MATROSKA_TRACK_DEFAULT;
|
|
break;
|
|
}
|
|
|
|
/* lacing (like MPEG, where blocks don't end/start on frame
|
|
* boundaries) */
|
|
case MATROSKA_ID_TRACKFLAGLACING: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
if (num)
|
|
track->flags |= MATROSKA_TRACK_LACING;
|
|
else
|
|
track->flags &= ~MATROSKA_TRACK_LACING;
|
|
break;
|
|
}
|
|
|
|
/* default length (in time) of one data block in this track */
|
|
case MATROSKA_ID_TRACKDEFAULTDURATION: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
track->default_duration = num;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown track header entry 0x%x - ignoring\n", id);
|
|
/* pass-through */
|
|
|
|
case EBML_ID_VOID:
|
|
/* we ignore these because they're nothing useful. */
|
|
case MATROSKA_ID_CODECINFOURL:
|
|
case MATROSKA_ID_CODECDOWNLOADURL:
|
|
case MATROSKA_ID_TRACKMINCACHE:
|
|
case MATROSKA_ID_TRACKMAXCACHE:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_tracks (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* one track within the "all-tracks" header */
|
|
case MATROSKA_ID_TRACKENTRY:
|
|
res = matroska_add_stream(matroska);
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in track header\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_index (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
MatroskaDemuxIndex idx;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* one single index entry ('point') */
|
|
case MATROSKA_ID_POINTENTRY:
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
|
|
/* in the end, we hope to fill one entry with a
|
|
* timestamp, a file position and a tracknum */
|
|
idx.pos = (uint64_t) -1;
|
|
idx.time = (uint64_t) -1;
|
|
idx.track = (uint16_t) -1;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* one single index entry ('point') */
|
|
case MATROSKA_ID_CUETIME: {
|
|
int64_t time;
|
|
if ((res = ebml_read_uint(matroska, &id,
|
|
&time)) < 0)
|
|
break;
|
|
idx.time = time * matroska->time_scale;
|
|
break;
|
|
}
|
|
|
|
/* position in the file + track to which it
|
|
* belongs */
|
|
case MATROSKA_ID_CUETRACKPOSITION:
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id (matroska,
|
|
&matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* track number */
|
|
case MATROSKA_ID_CUETRACK: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska,
|
|
&id, &num)) < 0)
|
|
break;
|
|
idx.track = num;
|
|
break;
|
|
}
|
|
|
|
/* position in file */
|
|
case MATROSKA_ID_CUECLUSTERPOSITION: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska,
|
|
&id, &num)) < 0)
|
|
break;
|
|
idx.pos = num;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in "
|
|
"CuesTrackPositions\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in cuespoint "
|
|
"index\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* so let's see if we got what we wanted */
|
|
if (idx.pos != (uint64_t) -1 &&
|
|
idx.time != (uint64_t) -1 &&
|
|
idx.track != (uint16_t) -1) {
|
|
if (matroska->num_indexes % 32 == 0) {
|
|
/* re-allocate bigger index */
|
|
matroska->index =
|
|
av_realloc(matroska->index,
|
|
(matroska->num_indexes + 32) *
|
|
sizeof(MatroskaDemuxIndex));
|
|
}
|
|
matroska->index[matroska->num_indexes] = idx;
|
|
matroska->num_indexes++;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in cues header\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_metadata (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* Hm, this is unsupported... */
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in metadata header\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
case MATROSKA_ID_SEEKENTRY: {
|
|
uint32_t seek_id = 0, peek_id_cache = 0;
|
|
uint64_t seek_pos = (uint64_t) -1, t;
|
|
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
case MATROSKA_ID_SEEKID:
|
|
res = ebml_read_uint(matroska, &id, &t);
|
|
seek_id = t;
|
|
break;
|
|
|
|
case MATROSKA_ID_SEEKPOSITION:
|
|
res = ebml_read_uint(matroska, &id, &seek_pos);
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown seekhead ID 0x%x\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!seek_id || seek_pos == (uint64_t) -1) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Incomplete seekhead entry (0x%x/%llu)\n",
|
|
seek_id, seek_pos);
|
|
break;
|
|
}
|
|
|
|
switch (seek_id) {
|
|
case MATROSKA_ID_CUES:
|
|
case MATROSKA_ID_TAGS: {
|
|
uint32_t level_up = matroska->level_up;
|
|
offset_t before_pos;
|
|
uint64_t length;
|
|
MatroskaLevel level;
|
|
|
|
/* remember the peeked ID and the current position */
|
|
peek_id_cache = matroska->peek_id;
|
|
before_pos = url_ftell(&matroska->ctx->pb);
|
|
|
|
/* seek */
|
|
if ((res = ebml_read_seek(matroska, seek_pos +
|
|
matroska->segment_start)) < 0)
|
|
return res;
|
|
|
|
/* we don't want to lose our seekhead level, so we add
|
|
* a dummy. This is a crude hack. */
|
|
if (matroska->num_levels == EBML_MAX_DEPTH) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Max EBML element depth (%d) reached, "
|
|
"cannot parse further.\n", EBML_MAX_DEPTH);
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
|
|
level.start = 0;
|
|
level.length = (uint64_t)-1;
|
|
matroska->levels[matroska->num_levels] = level;
|
|
matroska->num_levels++;
|
|
|
|
/* check ID */
|
|
if (!(id = ebml_peek_id (matroska,
|
|
&matroska->level_up)))
|
|
break;
|
|
if (id != seek_id) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"We looked for ID=0x%x but got "
|
|
"ID=0x%x (pos=%llu)",
|
|
seek_id, id, seek_pos +
|
|
matroska->segment_start);
|
|
goto finish;
|
|
}
|
|
|
|
/* read master + parse */
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
switch (id) {
|
|
case MATROSKA_ID_CUES:
|
|
if (!(res = matroska_parse_index(matroska)) ||
|
|
url_feof(&matroska->ctx->pb)) {
|
|
matroska->index_parsed = 1;
|
|
res = 0;
|
|
}
|
|
break;
|
|
case MATROSKA_ID_TAGS:
|
|
if (!(res = matroska_parse_metadata(matroska)) ||
|
|
url_feof(&matroska->ctx->pb)) {
|
|
matroska->metadata_parsed = 1;
|
|
res = 0;
|
|
}
|
|
break;
|
|
}
|
|
if (res < 0)
|
|
break;
|
|
|
|
finish:
|
|
/* remove dummy level */
|
|
while (matroska->num_levels) {
|
|
matroska->num_levels--;
|
|
length =
|
|
matroska->levels[matroska->num_levels].length;
|
|
if (length == (uint64_t)-1)
|
|
break;
|
|
}
|
|
|
|
/* seek back */
|
|
if ((res = ebml_read_seek(matroska, before_pos)) < 0)
|
|
return res;
|
|
matroska->peek_id = peek_id_cache;
|
|
matroska->level_up = level_up;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Ignoring seekhead entry for ID=0x%x\n",
|
|
seek_id);
|
|
break;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown seekhead ID 0x%x\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_read_header (AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
MatroskaDemuxContext *matroska = s->priv_data;
|
|
char *doctype;
|
|
int version, last_level, res = 0;
|
|
uint32_t id;
|
|
|
|
matroska->ctx = s;
|
|
|
|
/* First read the EBML header. */
|
|
doctype = NULL;
|
|
if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
|
|
return res;
|
|
if ((doctype == NULL) || strcmp(doctype, "matroska")) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Wrong EBML doctype ('%s' != 'matroska').\n",
|
|
doctype ? doctype : "(none)");
|
|
if (doctype)
|
|
av_free(doctype);
|
|
return AVERROR_NOFMT;
|
|
}
|
|
av_free(doctype);
|
|
if (version != 1) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"Matroska demuxer version 1 too old for file version %d\n",
|
|
version);
|
|
return AVERROR_NOFMT;
|
|
}
|
|
|
|
/* The next thing is a segment. */
|
|
while (1) {
|
|
if (!(id = ebml_peek_id(matroska, &last_level)))
|
|
return AVERROR_IO;
|
|
if (id == MATROSKA_ID_SEGMENT)
|
|
break;
|
|
|
|
/* oi! */
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Expected a Segment ID (0x%x), but received 0x%x!\n",
|
|
MATROSKA_ID_SEGMENT, id);
|
|
if ((res = ebml_read_skip(matroska)) < 0)
|
|
return res;
|
|
}
|
|
|
|
/* We now have a Matroska segment.
|
|
* Seeks are from the beginning of the segment,
|
|
* after the segment ID/length. */
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
return res;
|
|
matroska->segment_start = url_ftell(&s->pb);
|
|
|
|
matroska->time_scale = 1000000;
|
|
/* we've found our segment, start reading the different contents in here */
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* stream info */
|
|
case MATROSKA_ID_INFO: {
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_info(matroska);
|
|
break;
|
|
}
|
|
|
|
/* track info headers */
|
|
case MATROSKA_ID_TRACKS: {
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_tracks(matroska);
|
|
break;
|
|
}
|
|
|
|
/* stream index */
|
|
case MATROSKA_ID_CUES: {
|
|
if (!matroska->index_parsed) {
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_index(matroska);
|
|
} else
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
/* metadata */
|
|
case MATROSKA_ID_TAGS: {
|
|
if (!matroska->metadata_parsed) {
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_metadata(matroska);
|
|
} else
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
/* file index (if seekable, seek to Cues/Tags to parse it) */
|
|
case MATROSKA_ID_SEEKHEAD: {
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_seekhead(matroska);
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_CLUSTER: {
|
|
/* Do not read the master - this will be done in the next
|
|
* call to matroska_read_packet. */
|
|
res = 1;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown matroska file header ID 0x%x\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (res < 0)
|
|
return res;
|
|
|
|
/* Have we found a cluster? */
|
|
if (res == 1) {
|
|
int i;
|
|
enum CodecID codec_id;
|
|
MatroskaTrack *track;
|
|
AVStream *st;
|
|
|
|
for (i = 0; i < matroska->num_tracks; i++) {
|
|
track = matroska->tracks[i];
|
|
|
|
/* libavformat does not really support subtitles.
|
|
* Also apply some sanity checks. */
|
|
if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
|
|
(track->codec_id == NULL))
|
|
continue;
|
|
|
|
/* Set the FourCC from the CodecID. */
|
|
/* This is the MS compatibility mode which stores a
|
|
* BITMAPINFOHEADER in the CodecPrivate. */
|
|
if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
|
|
(track->codec_priv_size >= 40) &&
|
|
(track->codec_priv != NULL)) {
|
|
unsigned char *p;
|
|
|
|
/* Offset of biCompression. Stored in LE. */
|
|
p = (unsigned char *)track->codec_priv + 16;
|
|
((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
|
|
(p[2] << 16) | (p[1] << 8) | p[0];
|
|
codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc);
|
|
|
|
} else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
|
|
codec_id = CODEC_ID_MPEG4;
|
|
/* else if (!strcmp(track->codec_id, */
|
|
/* MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
|
|
/* codec_id = CODEC_ID_???; */
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
|
|
codec_id = CODEC_ID_MSMPEG4V3;
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_VIDEO_MPEG2))
|
|
codec_id = CODEC_ID_MPEG2VIDEO;
|
|
|
|
/* This is the MS compatibility mode which stores a
|
|
* WAVEFORMATEX in the CodecPrivate. */
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_ACM) &&
|
|
(track->codec_priv_size >= 18) &&
|
|
(track->codec_priv != NULL)) {
|
|
unsigned char *p;
|
|
uint16_t tag;
|
|
|
|
/* Offset of wFormatTag. Stored in LE. */
|
|
p = (unsigned char *)track->codec_priv;
|
|
tag = (p[1] << 8) | p[0];
|
|
codec_id = codec_get_wav_id(tag);
|
|
|
|
} else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
|
|
codec_id = CODEC_ID_MP3;
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
|
|
codec_id = CODEC_ID_PCM_U16BE;
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
|
|
codec_id = CODEC_ID_PCM_U16LE;
|
|
/* else if (!strcmp(track->codec_id, */
|
|
/* MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
|
|
/* codec_id = CODEC_ID_PCM_???; */
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_AC3))
|
|
codec_id = CODEC_ID_AC3;
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_DTS))
|
|
codec_id = CODEC_ID_DTS;
|
|
/* No such codec id so far. */
|
|
/* else if (!strcmp(track->codec_id, */
|
|
/* MATROSKA_CODEC_ID_AUDIO_DTS)) */
|
|
/* codec_id = CODEC_ID_DTS; */
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_VORBIS))
|
|
codec_id = CODEC_ID_VORBIS;
|
|
else if (!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
|
|
!strcmp(track->codec_id,
|
|
MATROSKA_CODEC_ID_AUDIO_MPEG4))
|
|
codec_id = CODEC_ID_AAC;
|
|
else
|
|
codec_id = CODEC_ID_NONE;
|
|
|
|
if (codec_id == CODEC_ID_NONE) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown/unsupported CodecID %s.\n",
|
|
track->codec_id);
|
|
}
|
|
|
|
track->stream_index = matroska->num_streams;
|
|
|
|
matroska->num_streams++;
|
|
st = av_new_stream(s, track->stream_index);
|
|
if (st == NULL)
|
|
return AVERROR_NOMEM;
|
|
av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
|
|
|
|
st->codec.codec_id = codec_id;
|
|
|
|
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
|
|
MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
|
|
|
|
st->codec.codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec.codec_tag = videotrack->fourcc;
|
|
st->codec.width = videotrack->pixel_width;
|
|
st->codec.height = videotrack->pixel_height;
|
|
if (videotrack->display_width == 0)
|
|
st->codec.sample_aspect_ratio.num =
|
|
videotrack->pixel_width;
|
|
else
|
|
st->codec.sample_aspect_ratio.num =
|
|
videotrack->display_width;
|
|
if (videotrack->display_height == 0)
|
|
st->codec.sample_aspect_ratio.num =
|
|
videotrack->pixel_height;
|
|
else
|
|
st->codec.sample_aspect_ratio.num =
|
|
videotrack->display_height;
|
|
|
|
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
|
|
MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
|
|
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec.sample_rate = audiotrack->samplerate;
|
|
st->codec.channels = audiotrack->channels;
|
|
}
|
|
|
|
/* What do we do with private data? E.g. for Vorbis. */
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
|
|
int num)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < matroska->num_tracks; i++)
|
|
if (matroska->tracks[i]->num == num)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
|
|
uint64_t cluster_time)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
AVPacket *pkt;
|
|
int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* one block inside the group. Note, block parsing is one
|
|
* of the harder things, so this code is a bit complicated.
|
|
* See http://www.matroska.org/ for documentation. */
|
|
case MATROSKA_ID_BLOCK: {
|
|
uint8_t *data, *origdata;
|
|
int size;
|
|
uint64_t time;
|
|
uint32_t *lace_size = NULL;
|
|
int n, track, flags, laces = 0;
|
|
uint64_t num;
|
|
|
|
if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
|
|
break;
|
|
origdata = data;
|
|
|
|
/* first byte(s): blocknum */
|
|
if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
|
|
av_log(matroska->ctx, AV_LOG_ERROR,
|
|
"EBML block data error\n");
|
|
av_free(origdata);
|
|
break;
|
|
}
|
|
data += n;
|
|
size -= n;
|
|
|
|
/* fetch track from num */
|
|
track = matroska_find_track_by_num(matroska, num);
|
|
if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Invalid stream %d or size %u\n", track, size);
|
|
av_free(origdata);
|
|
break;
|
|
}
|
|
|
|
/* time (relative to cluster time) */
|
|
time = ((data[0] << 8) | data[1]) * matroska->time_scale;
|
|
data += 2;
|
|
size -= 2;
|
|
flags = *data;
|
|
data += 1;
|
|
size -= 1;
|
|
switch ((flags & 0x06) >> 1) {
|
|
case 0x0: /* no lacing */
|
|
laces = 1;
|
|
lace_size = av_mallocz(sizeof(int));
|
|
lace_size[0] = size;
|
|
break;
|
|
|
|
case 0x1: /* xiph lacing */
|
|
case 0x2: /* fixed-size lacing */
|
|
case 0x3: /* EBML lacing */
|
|
if (size == 0) {
|
|
res = -1;
|
|
break;
|
|
}
|
|
laces = (*data) + 1;
|
|
data += 1;
|
|
size -= 1;
|
|
lace_size = av_mallocz(laces * sizeof(int));
|
|
|
|
switch ((flags & 0x06) >> 1) {
|
|
case 0x1: /* xiph lacing */ {
|
|
uint8_t temp;
|
|
uint32_t total = 0;
|
|
for (n = 0; res == 0 && n < laces - 1; n++) {
|
|
while (1) {
|
|
if (size == 0) {
|
|
res = -1;
|
|
break;
|
|
}
|
|
temp = *data;
|
|
lace_size[n] += temp;
|
|
data += 1;
|
|
size -= 1;
|
|
if (temp != 0xff)
|
|
break;
|
|
}
|
|
total += lace_size[n];
|
|
}
|
|
lace_size[n] = size - total;
|
|
break;
|
|
}
|
|
|
|
case 0x2: /* fixed-size lacing */
|
|
for (n = 0; n < laces; n++)
|
|
lace_size[n] = size / laces;
|
|
break;
|
|
|
|
case 0x3: /* EBML lacing */ {
|
|
uint32_t total;
|
|
n = matroska_ebmlnum_uint(data, size, &num);
|
|
if (n < 0) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"EBML block data error\n");
|
|
break;
|
|
}
|
|
data += n;
|
|
size -= n;
|
|
total = lace_size[0] = num;
|
|
for (n = 1; res == 0 && n < laces - 1; n++) {
|
|
int64_t snum;
|
|
int r;
|
|
r = matroska_ebmlnum_sint (data, size,
|
|
&snum);
|
|
if (r < 0) {
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"EBML block data error\n");
|
|
break;
|
|
}
|
|
data += r;
|
|
size -= r;
|
|
lace_size[n] = lace_size[n - 1] + snum;
|
|
total += lace_size[n];
|
|
}
|
|
lace_size[n] = size - total;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (res == 0) {
|
|
for (n = 0; n < laces; n++) {
|
|
uint64_t timecode = 0;
|
|
|
|
pkt = av_mallocz(sizeof(AVPacket));
|
|
/* XXX: prevent data copy... */
|
|
if (av_new_packet(pkt,lace_size[n]) < 0) {
|
|
res = AVERROR_NOMEM;
|
|
break;
|
|
}
|
|
if (cluster_time != (uint64_t)-1) {
|
|
if (time < 0 && (-time) > cluster_time)
|
|
timecode = cluster_time;
|
|
else
|
|
timecode = cluster_time + time;
|
|
}
|
|
/* FIXME: duration */
|
|
|
|
memcpy(pkt->data, data, lace_size[n]);
|
|
data += lace_size[n];
|
|
if (n == 0)
|
|
pkt->flags = is_keyframe;
|
|
pkt->stream_index =
|
|
matroska->tracks[track]->stream_index;
|
|
|
|
pkt->pts = timecode / 1000000; /* ns to ms */
|
|
|
|
matroska_queue_packet(matroska, pkt);
|
|
}
|
|
}
|
|
|
|
av_free(lace_size);
|
|
av_free(origdata);
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_BLOCKDURATION: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"FIXME: implement support for BlockDuration\n");
|
|
break;
|
|
}
|
|
|
|
case MATROSKA_ID_BLOCKREFERENCE:
|
|
/* We've found a reference, so not even the first frame in
|
|
* the lace is a key frame. */
|
|
is_keyframe = 0;
|
|
if (last_num_packets != matroska->num_packets)
|
|
matroska->packets[last_num_packets]->flags = 0;
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in blockgroup data\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_parse_cluster (MatroskaDemuxContext *matroska)
|
|
{
|
|
int res = 0;
|
|
uint32_t id;
|
|
uint64_t cluster_time = 0;
|
|
|
|
av_log(matroska->ctx, AV_LOG_DEBUG,
|
|
"parsing cluster at %lld\n", url_ftell(&matroska->ctx->pb));
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
/* cluster timecode */
|
|
case MATROSKA_ID_CLUSTERTIMECODE: {
|
|
uint64_t num;
|
|
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
|
|
break;
|
|
cluster_time = num * matroska->time_scale;
|
|
break;
|
|
}
|
|
|
|
/* a group of blocks inside a cluster */
|
|
case MATROSKA_ID_BLOCKGROUP:
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
res = matroska_parse_blockgroup(matroska, cluster_time);
|
|
break;
|
|
|
|
default:
|
|
av_log(matroska->ctx, AV_LOG_INFO,
|
|
"Unknown entry 0x%x in cluster data\n", id);
|
|
/* fall-through */
|
|
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
matroska_read_packet (AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MatroskaDemuxContext *matroska = s->priv_data;
|
|
int res = 0;
|
|
uint32_t id;
|
|
|
|
/* Do we still have a packet queued? */
|
|
if (matroska_deliver_packet(matroska, pkt) == 0)
|
|
return 0;
|
|
|
|
/* Have we already reached the end? */
|
|
if (matroska->done)
|
|
return AVERROR_IO;
|
|
|
|
while (res == 0) {
|
|
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
|
|
res = AVERROR_IO;
|
|
break;
|
|
} else if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
|
|
switch (id) {
|
|
case MATROSKA_ID_CLUSTER:
|
|
if ((res = ebml_read_master(matroska, &id)) < 0)
|
|
break;
|
|
if ((res = matroska_parse_cluster(matroska)) == 0)
|
|
res = 1; /* Parsed one cluster, let's get out. */
|
|
break;
|
|
|
|
default:
|
|
case EBML_ID_VOID:
|
|
res = ebml_read_skip(matroska);
|
|
break;
|
|
}
|
|
|
|
if (matroska->level_up) {
|
|
matroska->level_up--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (res == -1)
|
|
matroska->done = 1;
|
|
|
|
return matroska_deliver_packet(matroska, pkt);
|
|
}
|
|
|
|
static int
|
|
matroska_read_close (AVFormatContext *s)
|
|
{
|
|
MatroskaDemuxContext *matroska = s->priv_data;
|
|
int n = 0;
|
|
|
|
if (matroska->writing_app)
|
|
av_free(matroska->writing_app);
|
|
if (matroska->muxing_app)
|
|
av_free(matroska->muxing_app);
|
|
if (matroska->index)
|
|
av_free(matroska->index);
|
|
|
|
if (matroska->packets != NULL) {
|
|
for (n = 0; n < matroska->num_packets; n++) {
|
|
av_free_packet(matroska->packets[n]);
|
|
av_free(matroska->packets[n]);
|
|
}
|
|
av_free(matroska->packets);
|
|
}
|
|
|
|
for (n = 0; n < matroska->num_tracks; n++) {
|
|
MatroskaTrack *track = matroska->tracks[n];
|
|
if (track->codec_id)
|
|
av_free(track->codec_id);
|
|
if (track->codec_name)
|
|
av_free(track->codec_name);
|
|
if (track->codec_priv)
|
|
av_free(track->codec_priv);
|
|
if (track->name)
|
|
av_free(track->name);
|
|
if (track->language)
|
|
av_free(track->language);
|
|
|
|
av_free(track);
|
|
}
|
|
|
|
memset(matroska, 0, sizeof(MatroskaDemuxContext));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat matroska_iformat = {
|
|
"matroska",
|
|
"Matroska file format",
|
|
sizeof(MatroskaDemuxContext),
|
|
matroska_probe,
|
|
matroska_read_header,
|
|
matroska_read_packet,
|
|
matroska_read_close,
|
|
};
|
|
|
|
int
|
|
matroska_init(void)
|
|
{
|
|
av_register_input_format(&matroska_iformat);
|
|
return 0;
|
|
}
|