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