2 * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
3 * Copyright (c) 2008 Justin Ruggles
5 * This file is part of FFmpeg.
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.
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.
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
23 * @file libavcodec/flac.h
24 * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
27 #ifndef AVCODEC_FLAC_H
28 #define AVCODEC_FLAC_H
32 #define FLAC_STREAMINFO_SIZE 34
33 #define FLAC_MAX_CHANNELS 8
34 #define FLAC_MIN_BLOCKSIZE 16
35 #define FLAC_MAX_BLOCKSIZE 65535
38 FLAC_CHMODE_INDEPENDENT
= 0,
39 FLAC_CHMODE_LEFT_SIDE
= 8,
40 FLAC_CHMODE_RIGHT_SIDE
= 9,
41 FLAC_CHMODE_MID_SIDE
= 10,
45 FLAC_METADATA_TYPE_STREAMINFO
= 0,
46 FLAC_METADATA_TYPE_PADDING
,
47 FLAC_METADATA_TYPE_APPLICATION
,
48 FLAC_METADATA_TYPE_SEEKTABLE
,
49 FLAC_METADATA_TYPE_VORBIS_COMMENT
,
50 FLAC_METADATA_TYPE_CUESHEET
,
51 FLAC_METADATA_TYPE_PICTURE
,
52 FLAC_METADATA_TYPE_INVALID
= 127
55 enum FLACExtradataFormat
{
56 FLAC_EXTRADATA_FORMAT_STREAMINFO
= 0,
57 FLAC_EXTRADATA_FORMAT_FULL_HEADER
= 1
61 * Data needed from the Streaminfo header for use by the raw FLAC demuxer
62 * and/or the FLAC decoder.
64 #define FLACSTREAMINFO \
65 int max_blocksize; /**< maximum block size, in samples */\
66 int max_framesize; /**< maximum frame size, in bytes */\
67 int samplerate; /**< sample rate */\
68 int channels; /**< number of channels */\
69 int bps; /**< bits-per-sample */\
70 int64_t samples; /**< total number of samples */\
72 typedef struct FLACStreaminfo {
77 * Parse the Streaminfo metadata block
78 * @param[out] avctx codec context to set basic stream parameters
79 * @param[out] s where parsed information is stored
80 * @param[in] buffer pointer to start of 34-byte streaminfo data
82 void ff_flac_parse_streaminfo(AVCodecContext
*avctx
, struct FLACStreaminfo
*s
,
83 const uint8_t *buffer
);
86 * Validate the FLAC extradata.
87 * @param[in] avctx codec context containing the extradata.
88 * @param[out] format extradata format.
89 * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
90 * @return 1 if valid, 0 if not valid.
92 int ff_flac_is_extradata_valid(AVCodecContext
*avctx
,
93 enum FLACExtradataFormat
*format
,
94 uint8_t **streaminfo_start
);
97 * Parse the metadata block parameters from the header.
98 * @param[in] block_header header data, at least 4 bytes
99 * @param[out] last indicator for last metadata block
100 * @param[out] type metadata block type
101 * @param[out] size metadata block size
103 void ff_flac_parse_block_header(const uint8_t *block_header
,
104 int *last
, int *type
, int *size
);
107 * Calculate an estimate for the maximum frame size based on verbatim mode.
108 * @param blocksize block size, in samples
109 * @param ch number of channels
110 * @param bps bits-per-sample
112 int ff_flac_get_max_frame_size(int blocksize
, int ch
, int bps
);
114 #endif /* AVCODEC_FLAC_H */