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96 lines
3.3 KiB
96 lines
3.3 KiB
/* |
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* FLAC (Free Lossless Audio Codec) decoder/demuxer 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 libavcodec/flac.h |
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* FLAC (Free Lossless Audio Codec) decoder/demuxer common functions |
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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 "avcodec.h" |
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#define FLAC_STREAMINFO_SIZE 34 |
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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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enum FLACExtradataFormat { |
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FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, |
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FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 |
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}; |
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/** |
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* Data needed from the Streaminfo header for use by the raw FLAC demuxer |
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* and/or the FLAC decoder. |
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*/ |
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#define FLACSTREAMINFO \ |
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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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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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int64_t samples; /**< total number of samples */\ |
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typedef struct FLACStreaminfo { |
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FLACSTREAMINFO |
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} FLACStreaminfo; |
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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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void 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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enum FLACExtradataFormat *format, |
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uint8_t **streaminfo_start); |
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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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void ff_flac_parse_block_header(const uint8_t *block_header, |
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int *last, int *type, int *size); |
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#endif /* AVCODEC_FLAC_H */
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