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7a9bc09176
It more directly shows that ff_flac_decode_frame_header() does not modify the AVCodecContext given to it at all; and it would not be allowed to do so, given that it is used by the parser when it is still unknown whether said frame header is even valid. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
/*
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* FLAC (Free Lossless Audio Codec) decoder/parser common functions
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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) decoder/parser common functions
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*/
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#ifndef AVCODEC_FLAC_PARSE_H
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#define AVCODEC_FLAC_PARSE_H
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#include "avcodec.h"
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#include "get_bits.h"
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typedef struct FLACStreaminfo {
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int samplerate; /**< sample rate */
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int channels; /**< number of channels */
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int bps; /**< bits-per-sample */
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int max_blocksize; /**< maximum block size, in samples */
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int max_framesize; /**< maximum frame size, in bytes */
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int64_t samples; /**< total number of samples */
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} FLACStreaminfo;
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typedef struct FLACFrameInfo {
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int samplerate; /**< sample rate */
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int channels; /**< number of channels */
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int bps; /**< bits-per-sample */
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int blocksize; /**< block size of the frame */
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int ch_mode; /**< channel decorrelation mode */
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int64_t frame_or_sample_num; /**< frame number or sample number */
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int is_var_size; /**< specifies if the stream uses variable
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block sizes or a fixed block size;
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also determines the meaning of
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frame_or_sample_num */
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} FLACFrameInfo;
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/**
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* Parse the Streaminfo metadata block
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* @param[out] avctx codec context to set basic stream parameters
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* @param[out] s where parsed information is stored
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* @param[in] buffer pointer to start of 34-byte streaminfo data
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*
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* @return negative error code on faiure or >= 0 on success
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*/
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int ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
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const uint8_t *buffer);
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/**
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* Validate the FLAC extradata.
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* @param[in] avctx codec context containing the extradata.
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* @param[out] format extradata format.
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* @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
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* @return 1 if valid, 0 if not valid.
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*/
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int ff_flac_is_extradata_valid(AVCodecContext *avctx,
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uint8_t **streaminfo_start);
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/**
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* Validate and decode a frame header.
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* @param logctx context for logging
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* @param gb GetBitContext from which to read frame header
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* @param[out] fi frame information
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* @param log_level_offset log level offset. can be used to silence error messages.
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* @return non-zero on error, 0 if ok
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*/
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int ff_flac_decode_frame_header(void *logctx, GetBitContext *gb,
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FLACFrameInfo *fi, int log_level_offset);
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void ff_flac_set_channel_layout(AVCodecContext *avctx, int channels);
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#endif /* AVCODEC_FLAC_PARSE_H */
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