Libav 0.7.1
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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 Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 #include "get_bits.h" 00032 00033 #define FLAC_STREAMINFO_SIZE 34 00034 #define FLAC_MAX_CHANNELS 8 00035 #define FLAC_MIN_BLOCKSIZE 16 00036 #define FLAC_MAX_BLOCKSIZE 65535 00037 #define FLAC_MIN_FRAME_SIZE 11 00038 00039 enum { 00040 FLAC_CHMODE_INDEPENDENT = 0, 00041 FLAC_CHMODE_LEFT_SIDE = 8, 00042 FLAC_CHMODE_RIGHT_SIDE = 9, 00043 FLAC_CHMODE_MID_SIDE = 10, 00044 }; 00045 00046 enum { 00047 FLAC_METADATA_TYPE_STREAMINFO = 0, 00048 FLAC_METADATA_TYPE_PADDING, 00049 FLAC_METADATA_TYPE_APPLICATION, 00050 FLAC_METADATA_TYPE_SEEKTABLE, 00051 FLAC_METADATA_TYPE_VORBIS_COMMENT, 00052 FLAC_METADATA_TYPE_CUESHEET, 00053 FLAC_METADATA_TYPE_PICTURE, 00054 FLAC_METADATA_TYPE_INVALID = 127 00055 }; 00056 00057 enum FLACExtradataFormat { 00058 FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, 00059 FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 00060 }; 00061 00062 #define FLACCOMMONINFO \ 00063 int samplerate; \ 00064 int channels; \ 00065 int bps; \ 00066 00067 00071 #define FLACSTREAMINFO \ 00072 FLACCOMMONINFO \ 00073 int max_blocksize; \ 00074 int max_framesize; \ 00075 int64_t samples; \ 00076 00077 typedef struct FLACStreaminfo { 00078 FLACSTREAMINFO 00079 } FLACStreaminfo; 00080 00081 typedef struct FLACFrameInfo { 00082 FLACCOMMONINFO 00083 int blocksize; 00084 int ch_mode; 00085 int64_t frame_or_sample_num; 00086 int is_var_size; 00090 } FLACFrameInfo; 00091 00098 void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, 00099 const uint8_t *buffer); 00100 00108 int ff_flac_is_extradata_valid(AVCodecContext *avctx, 00109 enum FLACExtradataFormat *format, 00110 uint8_t **streaminfo_start); 00111 00119 void ff_flac_parse_block_header(const uint8_t *block_header, 00120 int *last, int *type, int *size); 00121 00128 int ff_flac_get_max_frame_size(int blocksize, int ch, int bps); 00129 00138 int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, 00139 FLACFrameInfo *fi, int log_level_offset); 00140 #endif /* AVCODEC_FLAC_H */