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89 lines
3.7 KiB
89 lines
3.7 KiB
/* |
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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 avctx AVCodecContext to use as av_log() context |
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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(AVCodecContext *avctx, 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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