76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* FLAC (Free Lossless Audio Codec) common stuff
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* Copyright (c) 2008 Justin Ruggles
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* FLAC (Free Lossless Audio Codec) common stuff
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*/
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#ifndef AVCODEC_FLAC_H
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#define AVCODEC_FLAC_H
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#include "libavutil/intreadwrite.h"
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#define FLAC_STREAMINFO_SIZE 34
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#define FLAC_MAX_CHANNELS 8
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#define FLAC_MIN_BLOCKSIZE 16
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#define FLAC_MAX_BLOCKSIZE 65535
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#define FLAC_MIN_FRAME_SIZE 10
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enum {
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FLAC_CHMODE_INDEPENDENT = 0,
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FLAC_CHMODE_LEFT_SIDE = 1,
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FLAC_CHMODE_RIGHT_SIDE = 2,
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FLAC_CHMODE_MID_SIDE = 3,
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};
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enum {
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FLAC_METADATA_TYPE_STREAMINFO = 0,
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FLAC_METADATA_TYPE_PADDING,
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FLAC_METADATA_TYPE_APPLICATION,
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FLAC_METADATA_TYPE_SEEKTABLE,
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FLAC_METADATA_TYPE_VORBIS_COMMENT,
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FLAC_METADATA_TYPE_CUESHEET,
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FLAC_METADATA_TYPE_PICTURE,
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FLAC_METADATA_TYPE_INVALID = 127
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};
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/**
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* Parse the metadata block parameters from the header.
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* @param[in] block_header header data, at least 4 bytes
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* @param[out] last indicator for last metadata block
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* @param[out] type metadata block type
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* @param[out] size metadata block size
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*/
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static av_always_inline void flac_parse_block_header(const uint8_t *block_header,
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int *last, int *type, int *size)
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{
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int tmp = *block_header;
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if (last)
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*last = tmp & 0x80;
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if (type)
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*type = tmp & 0x7F;
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if (size)
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*size = AV_RB24(block_header + 1);
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}
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#endif /* AVCODEC_FLAC_H */
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