flac.h
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1 /*
2  * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
3  * Copyright (c) 2008 Justin Ruggles
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #ifndef AVCODEC_FLAC_H
28 #define AVCODEC_FLAC_H
29 
30 #include "avcodec.h"
31 #include "get_bits.h"
32 
33 #define FLAC_STREAMINFO_SIZE 34
34 #define FLAC_MAX_CHANNELS 8
35 #define FLAC_MIN_BLOCKSIZE 16
36 #define FLAC_MAX_BLOCKSIZE 65535
37 #define FLAC_MIN_FRAME_SIZE 11
38 
39 enum {
44 };
45 
46 enum {
55 };
56 
60 };
61 
62 #define FLACCOMMONINFO \
63  int samplerate; \
64  int channels; \
65  int bps; \
66 
67 
71 #define FLACSTREAMINFO \
72  FLACCOMMONINFO \
73  int max_blocksize; \
74  int max_framesize; \
75  int64_t samples; \
76 
77 typedef struct FLACStreaminfo {
80 
81 typedef struct FLACFrameInfo {
83  int blocksize;
84  int ch_mode;
91 
99  const uint8_t *buffer);
100 
109  enum FLACExtradataFormat *format,
110  uint8_t **streaminfo_start);
111 
119 void avpriv_flac_parse_block_header(const uint8_t *block_header,
120  int *last, int *type, int *size);
121 
128 int ff_flac_get_max_frame_size(int blocksize, int ch, int bps);
129 
139  FLACFrameInfo *fi, int log_level_offset);
140 
142 
143 #endif /* AVCODEC_FLAC_H */
int size
int64_t frame_or_sample_num
frame number or sample number
Definition: flac.h:87
FLACCOMMONINFO int blocksize
block size of the frame
Definition: flac.h:85
int ff_flac_get_max_frame_size(int blocksize, int ch, int bps)
Calculate an estimate for the maximum frame size based on verbatim mode.
Definition: flac.c:146
uint8_t
void ff_flac_set_channel_layout(AVCodecContext *avctx)
Definition: flac.c:194
void avpriv_flac_parse_block_header(const uint8_t *block_header, int *last, int *type, int *size)
Parse the metadata block parameters from the header.
Definition: flac.c:235
bitstream reader API header.
int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, FLACFrameInfo *fi, int log_level_offset)
Validate and decode a frame header.
Definition: flac.c:48
struct FLACFrameInfo FLACFrameInfo
FLACExtradataFormat
Definition: flac.h:57
int ch_mode
channel decorrelation mode
Definition: flac.h:86
#define FLACCOMMONINFO
bits-per-sample
Definition: flac.h:62
#define FLACSTREAMINFO
Data needed from the Streaminfo header for use by the raw FLAC demuxer and/or the FLAC decoder...
Definition: flac.h:72
void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer)
Parse the Streaminfo metadata block.
Definition: flac.c:202
int avpriv_flac_is_extradata_valid(AVCodecContext *avctx, enum FLACExtradataFormat *format, uint8_t **streaminfo_start)
Validate the FLAC extradata.
Definition: flac.c:167
static char buffer[20]
Definition: seek-test.c:31
struct FLACStreaminfo FLACStreaminfo
external API header
main external API structure.
Definition: avcodec.h:1339
unsigned bps
Definition: movenc.c:803
int is_var_size
specifies if the stream uses variable block sizes or a fixed block size; also determines the meaning ...
Definition: flac.h:88