1/* 2 * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions 3 * Copyright (c) 2008 Justin Ruggles 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file libavcodec/flac.h 24 * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions 25 */ 26 27#ifndef AVCODEC_FLAC_H 28#define AVCODEC_FLAC_H 29 30#include "avcodec.h" 31 32#define FLAC_STREAMINFO_SIZE 34 33 34enum { 35 FLAC_METADATA_TYPE_STREAMINFO = 0, 36 FLAC_METADATA_TYPE_PADDING, 37 FLAC_METADATA_TYPE_APPLICATION, 38 FLAC_METADATA_TYPE_SEEKTABLE, 39 FLAC_METADATA_TYPE_VORBIS_COMMENT, 40 FLAC_METADATA_TYPE_CUESHEET, 41 FLAC_METADATA_TYPE_PICTURE, 42 FLAC_METADATA_TYPE_INVALID = 127 43}; 44 45enum FLACExtradataFormat { 46 FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, 47 FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 48}; 49 50/** 51 * Data needed from the Streaminfo header for use by the raw FLAC demuxer 52 * and/or the FLAC decoder. 53 */ 54#define FLACSTREAMINFO \ 55 int min_blocksize; /**< minimum block size, in samples */\ 56 int max_blocksize; /**< maximum block size, in samples */\ 57 int max_framesize; /**< maximum frame size, in bytes */\ 58 int samplerate; /**< sample rate */\ 59 int channels; /**< number of channels */\ 60 int bps; /**< bits-per-sample */\ 61 int64_t samples; /**< total number of samples */\ 62 63typedef struct FLACStreaminfo { 64 FLACSTREAMINFO 65} FLACStreaminfo; 66 67/** 68 * Parse the Streaminfo metadata block 69 * @param[out] avctx codec context to set basic stream parameters 70 * @param[out] s where parsed information is stored 71 * @param[in] buffer pointer to start of 34-byte streaminfo data 72 */ 73void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, 74 const uint8_t *buffer); 75 76/** 77 * Validate the FLAC extradata. 78 * @param[in] avctx codec context containing the extradata. 79 * @param[out] format extradata format. 80 * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data. 81 * @return 1 if valid, 0 if not valid. 82 */ 83int ff_flac_is_extradata_valid(AVCodecContext *avctx, 84 enum FLACExtradataFormat *format, 85 uint8_t **streaminfo_start); 86 87#endif /* AVCODEC_FLAC_H */ 88