mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 10:52:20 +00:00
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
|
|
* FLAC (Free Lossless Audio Codec) common stuff
|
|
* Copyright (c) 2008 Justin Ruggles
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* FLAC (Free Lossless Audio Codec) common stuff
|
|
*/
|
|
|
|
#ifndef AVCODEC_FLAC_H
|
|
#define AVCODEC_FLAC_H
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#define FLAC_STREAMINFO_SIZE 34
|
|
#define FLAC_MAX_CHANNELS 8
|
|
#define FLAC_MIN_BLOCKSIZE 16
|
|
#define FLAC_MAX_BLOCKSIZE 65535
|
|
#define FLAC_MIN_FRAME_SIZE 10
|
|
|
|
enum {
|
|
FLAC_CHMODE_INDEPENDENT = 0,
|
|
FLAC_CHMODE_LEFT_SIDE = 1,
|
|
FLAC_CHMODE_RIGHT_SIDE = 2,
|
|
FLAC_CHMODE_MID_SIDE = 3,
|
|
};
|
|
|
|
enum {
|
|
FLAC_METADATA_TYPE_STREAMINFO = 0,
|
|
FLAC_METADATA_TYPE_PADDING,
|
|
FLAC_METADATA_TYPE_APPLICATION,
|
|
FLAC_METADATA_TYPE_SEEKTABLE,
|
|
FLAC_METADATA_TYPE_VORBIS_COMMENT,
|
|
FLAC_METADATA_TYPE_CUESHEET,
|
|
FLAC_METADATA_TYPE_PICTURE,
|
|
FLAC_METADATA_TYPE_INVALID = 127
|
|
};
|
|
|
|
/**
|
|
* Parse the metadata block parameters from the header.
|
|
* @param[in] block_header header data, at least 4 bytes
|
|
* @param[out] last indicator for last metadata block
|
|
* @param[out] type metadata block type
|
|
* @param[out] size metadata block size
|
|
*/
|
|
static av_always_inline void flac_parse_block_header(const uint8_t *block_header,
|
|
int *last, int *type, int *size)
|
|
{
|
|
int tmp = *block_header;
|
|
if (last)
|
|
*last = tmp & 0x80;
|
|
if (type)
|
|
*type = tmp & 0x7F;
|
|
if (size)
|
|
*size = AV_RB24(block_header + 1);
|
|
}
|
|
|
|
#endif /* AVCODEC_FLAC_H */
|