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libavcodec/flac.h

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00001 /*
00002  * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
00003  * Copyright (c) 2008 Justin Ruggles
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #ifndef AVCODEC_FLAC_H
00028 #define AVCODEC_FLAC_H
00029 
00030 #include "avcodec.h"
00031 
00032 #define FLAC_STREAMINFO_SIZE   34
00033 #define FLAC_MAX_CHANNELS       8
00034 #define FLAC_MIN_BLOCKSIZE     16
00035 #define FLAC_MAX_BLOCKSIZE  65535
00036 
00037 enum {
00038     FLAC_CHMODE_INDEPENDENT =  0,
00039     FLAC_CHMODE_LEFT_SIDE   =  8,
00040     FLAC_CHMODE_RIGHT_SIDE  =  9,
00041     FLAC_CHMODE_MID_SIDE    = 10,
00042 };
00043 
00044 enum {
00045     FLAC_METADATA_TYPE_STREAMINFO = 0,
00046     FLAC_METADATA_TYPE_PADDING,
00047     FLAC_METADATA_TYPE_APPLICATION,
00048     FLAC_METADATA_TYPE_SEEKTABLE,
00049     FLAC_METADATA_TYPE_VORBIS_COMMENT,
00050     FLAC_METADATA_TYPE_CUESHEET,
00051     FLAC_METADATA_TYPE_PICTURE,
00052     FLAC_METADATA_TYPE_INVALID = 127
00053 };
00054 
00055 enum FLACExtradataFormat {
00056     FLAC_EXTRADATA_FORMAT_STREAMINFO  = 0,
00057     FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1
00058 };
00059 
00060 #define FLACCOMMONINFO \
00061     int samplerate;         \
00062     int channels;           \
00063     int bps;                \
00064 
00065 
00069 #define FLACSTREAMINFO \
00070     FLACCOMMONINFO \
00071     int max_blocksize;      \
00072     int max_framesize;      \
00073     int64_t samples;        \
00074 
00075 typedef struct FLACStreaminfo {
00076     FLACSTREAMINFO
00077 } FLACStreaminfo;
00078 
00079 typedef struct FLACFrameInfo {
00080     FLACCOMMONINFO
00081     int blocksize;          
00082     int ch_mode;            
00083 } FLACFrameInfo;
00084 
00091 void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
00092                               const uint8_t *buffer);
00093 
00101 int ff_flac_is_extradata_valid(AVCodecContext *avctx,
00102                                enum FLACExtradataFormat *format,
00103                                uint8_t **streaminfo_start);
00104 
00112 void ff_flac_parse_block_header(const uint8_t *block_header,
00113                                 int *last, int *type, int *size);
00114 
00121 int ff_flac_get_max_frame_size(int blocksize, int ch, int bps);
00122 
00123 #endif /* AVCODEC_FLAC_H */

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