libavcodec/flac.h File Reference

FLAC (Free Lossless Audio Codec) decoder/demuxer common functions. More...

#include "avcodec.h"
#include "get_bits.h"

Go to the source code of this file.

Data Structures

struct  FLACStreaminfo
struct  FLACFrameInfo

Defines

#define FLAC_STREAMINFO_SIZE   34
#define FLAC_MAX_CHANNELS   8
#define FLAC_MIN_BLOCKSIZE   16
#define FLAC_MAX_BLOCKSIZE   65535
#define FLAC_MIN_FRAME_SIZE   11
#define FLACCOMMONINFO
 bits-per-sample
#define FLACSTREAMINFO
 Data needed from the Streaminfo header for use by the raw FLAC demuxer and/or the FLAC decoder.

Enumerations

enum  { FLAC_CHMODE_INDEPENDENT = 0, FLAC_CHMODE_LEFT_SIDE = 1, FLAC_CHMODE_RIGHT_SIDE = 2, FLAC_CHMODE_MID_SIDE = 3 }
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 }

Functions

void avpriv_flac_parse_streaminfo (AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer)
 Parse the Streaminfo metadata block.
int avpriv_flac_is_extradata_valid (AVCodecContext *avctx, enum FLACExtradataFormat *format, uint8_t **streaminfo_start)
 Validate the FLAC extradata.
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.
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.
int ff_flac_decode_frame_header (AVCodecContext *avctx, GetBitContext *gb, FLACFrameInfo *fi, int log_level_offset)
 Validate and decode a frame header.


Detailed Description

FLAC (Free Lossless Audio Codec) decoder/demuxer common functions.

Definition in file flac.h.


Define Documentation

#define FLAC_MAX_BLOCKSIZE   65535

Definition at line 36 of file flac.h.

Referenced by decode_frame(), flac_decode_frame(), and flac_encode_init().

#define FLAC_MAX_CHANNELS   8

#define FLAC_MIN_BLOCKSIZE   16

Definition at line 35 of file flac.h.

Referenced by avpriv_flac_parse_streaminfo(), and flac_encode_init().

#define FLAC_MIN_FRAME_SIZE   11

Definition at line 37 of file flac.h.

Referenced by flac_decode_frame().

#define FLAC_STREAMINFO_SIZE   34

#define FLACCOMMONINFO

Value:

int samplerate;         \
    int channels;           \
    int bps;
bits-per-sample

Definition at line 62 of file flac.h.

#define FLACSTREAMINFO

Value:

FLACCOMMONINFO \
    int max_blocksize;      \
    int max_framesize;      \
    int64_t samples;
Data needed from the Streaminfo header for use by the raw FLAC demuxer and/or the FLAC decoder.

total number of samples

Definition at line 72 of file flac.h.


Enumeration Type Documentation

anonymous enum

Enumerator:
FLAC_CHMODE_INDEPENDENT 
FLAC_CHMODE_LEFT_SIDE 
FLAC_CHMODE_RIGHT_SIDE 
FLAC_CHMODE_MID_SIDE 

Definition at line 39 of file flac.h.

anonymous enum

Enumerator:
FLAC_METADATA_TYPE_STREAMINFO 
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 

Definition at line 46 of file flac.h.

Enumerator:
FLAC_EXTRADATA_FORMAT_STREAMINFO 
FLAC_EXTRADATA_FORMAT_FULL_HEADER 

Definition at line 57 of file flac.h.


Function Documentation

int avpriv_flac_is_extradata_valid ( AVCodecContext avctx,
enum FLACExtradataFormat format,
uint8_t **  streaminfo_start 
)

Validate the FLAC extradata.

Parameters:
[in] avctx codec context containing the extradata.
[out] format extradata format.
[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
Returns:
1 if valid, 0 if not valid.

Definition at line 157 of file flac.c.

Referenced by ff_flac_write_header(), flac_decode_init(), flac_write_trailer(), and ogg_build_flac_headers().

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.

Parameters:
[in] block_header header data, at least 4 bytes
[out] last indicator for last metadata block
[out] type metadata block type
[out] size metadata block size

Definition at line 216 of file flac.c.

Referenced by flac_read_header(), get_metadata_size(), and parse_streaminfo().

void avpriv_flac_parse_streaminfo ( AVCodecContext avctx,
struct FLACStreaminfo s,
const uint8_t buffer 
)

Parse the Streaminfo metadata block.

Parameters:
[out] avctx codec context to set basic stream parameters
[out] s where parsed information is stored
[in] buffer pointer to start of 34-byte streaminfo data

Definition at line 184 of file flac.c.

Referenced by flac_decode_init(), flac_header(), flac_read_header(), and parse_streaminfo().

int ff_flac_decode_frame_header ( AVCodecContext avctx,
GetBitContext gb,
FLACFrameInfo fi,
int  log_level_offset 
)

Validate and decode a frame header.

Parameters:
avctx AVCodecContext to use as av_log() context
gb GetBitContext from which to read frame header
[out] fi frame information
log_level_offset log level offset. can be used to silence error messages.
Returns:
non-zero on error, 0 if ok

Definition at line 38 of file flac.c.

Referenced by decode_frame(), and frame_header_is_valid().

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.

Parameters:
blocksize block size, in samples
ch number of channels
bps bits-per-sample

Definition at line 136 of file flac.c.

Referenced by flac_decode_frame(), flac_encode_frame(), and flac_encode_init().


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