flac.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/log.h"
#include "bytestream.h"
#include "get_bits.h"
#include "flac.h"
#include "flacdata.h"

Go to the source code of this file.

Functions
static int64_t	get_utf8 (GetBitContext *gb)
int	ff_flac_decode_frame_header (AVCodecContext *avctx, GetBitContext *gb, FLACFrameInfo *fi, int log_level_offset)
	Validate and decode a frame 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	avpriv_flac_is_extradata_valid (AVCodecContext *avctx, enum FLACExtradataFormat *format, uint8_t **streaminfo_start)
	Validate the FLAC extradata.
void	ff_flac_set_channel_layout (AVCodecContext *avctx)
void	avpriv_flac_parse_streaminfo (AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer)
	Parse the Streaminfo metadata block.
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.

Variables
static const int8_t	sample_size_table [] = { 0, 8, 12, 0, 16, 20, 24, 0 }
static const int64_t	flac_channel_layouts [6]

Function Documentation

static int64_t get_utf8 ( GetBitContext *  gb )

static

Definition at line 41 of file flac.c.

Referenced by ff_flac_decode_frame_header().

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 48 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 146 of file flac.c.

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

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 167 of file flac.c.

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

void ff_flac_set_channel_layout

(

AVCodecContext *

avctx

)

Definition at line 194 of file flac.c.

Referenced by avpriv_flac_parse_streaminfo(), decode_frame(), and get_best_header().

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 202 of file flac.c.

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

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 234 of file flac.c.

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

Variable Documentation

const int8_t sample_size_table[] = { 0, 8, 12, 0, 16, 20, 24, 0 }

static

Definition at line 30 of file flac.c.

Referenced by ff_flac_decode_frame_header().

const int64_t flac_channel_layouts[6]

static

Initial value:

= {
    AV_CH_LAYOUT_MONO,
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_SURROUND,
    AV_CH_LAYOUT_QUAD,
    AV_CH_LAYOUT_5POINT0,
    AV_CH_LAYOUT_5POINT1
}

Definition at line 32 of file flac.c.

Referenced by ff_flac_set_channel_layout().