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- /*
- * FLAC (Free Lossless Audio Codec) decoder/demuxer 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 libavcodec/flac.h
- * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
- */
- #ifndef AVCODEC_FLAC_H
- #define AVCODEC_FLAC_H
- #include "avcodec.h"
- #define FLAC_STREAMINFO_SIZE 34
- 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
- };
- enum FLACExtradataFormat {
- FLAC_EXTRADATA_FORMAT_STREAMINFO = 0,
- FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1
- };
- /**
- * Data needed from the Streaminfo header for use by the raw FLAC demuxer
- * and/or the FLAC decoder.
- */
- #define FLACSTREAMINFO \
- int min_blocksize; /**< minimum block size, in samples */\
- int max_blocksize; /**< maximum block size, in samples */\
- int max_framesize; /**< maximum frame size, in bytes */\
- int samplerate; /**< sample rate */\
- int channels; /**< number of channels */\
- int bps; /**< bits-per-sample */\
- int64_t samples; /**< total number of samples */\
- typedef struct FLACStreaminfo {
- FLACSTREAMINFO
- } FLACStreaminfo;
- /**
- * 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
- */
- void 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,
- enum FLACExtradataFormat *format,
- uint8_t **streaminfo_start);
- #endif /* AVCODEC_FLAC_H */
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