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/*
* FLAC (Free Lossless Audio Codec) decoder/parser common functions
* 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) decoder/parser common functions
*/
#ifndef AVCODEC_FLAC_PARSE_H
#define AVCODEC_FLAC_PARSE_H
#include "avcodec.h"
#include "get_bits.h"
typedef struct FLACStreaminfo {
int samplerate; /**< sample rate */
int channels; /**< number of channels */
int bps; /**< bits-per-sample */
int max_blocksize; /**< maximum block size, in samples */
int max_framesize; /**< maximum frame size, in bytes */
int64_t samples; /**< total number of samples */
} FLACStreaminfo;
typedef struct FLACFrameInfo {
int samplerate; /**< sample rate */
int channels; /**< number of channels */
int bps; /**< bits-per-sample */
int blocksize; /**< block size of the frame */
int ch_mode; /**< channel decorrelation mode */
int64_t frame_or_sample_num; /**< frame number or sample number */
int is_var_size; /**< specifies if the stream uses variable
block sizes or a fixed block size;
also determines the meaning of
frame_or_sample_num */
} FLACFrameInfo;
/**
* Parse the Streaminfo metadata block
* @param[out] avctx codec context to set basic stream parameters
* @param[out] s where parsed information is stored
* @param[in] buffer pointer to start of 34-byte streaminfo data
*
* @return negative error code on failure or >= 0 on success
*/
int ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
const uint8_t *buffer);
/**
* Validate the FLAC extradata.
* @param[in] avctx codec context containing the extradata.
* @param[out] format extradata format.
* @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
* @return 1 if valid, 0 if not valid.
*/
int ff_flac_is_extradata_valid(AVCodecContext *avctx,
uint8_t **streaminfo_start);
/**
* Validate and decode a frame header.
* @param logctx context for logging
* @param gb GetBitContext from which to read frame header
* @param[out] fi frame information
* @param log_level_offset log level offset. can be used to silence error messages.
* @return non-zero on error, 0 if ok
*/
int ff_flac_decode_frame_header(void *logctx, GetBitContext *gb,
FLACFrameInfo *fi, int log_level_offset);
void ff_flac_set_channel_layout(AVCodecContext *avctx, int channels);
#endif /* AVCODEC_FLAC_PARSE_H */
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