flac.c File Reference

---

Detailed Description

FLAC (Free Lossless Audio Codec) decoder.

Author:

Alex Beregszaszi

For more information on the FLAC format, visit: http://flac.sourceforge.net/

This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed through, starting from the initial 'fLaC' signature; or by passing the 34-byte streaminfo structure through avctx->extradata[_size] followed by data starting with the 0xFFF8 marker.

Definition in file flac.c.

Go to the source code of this file.

Classes
struct	FLACContext
Enumerations
enum	decorrelation_type { INDEPENDENT, LEFT_SIDE, RIGHT_SIDE, MID_SIDE }
Functions
static int64_t	get_utf8 (GetBitContext *gb)
static void	metadata_streaminfo (FLACContext *s)
static void	allocate_buffers (FLACContext *s)
static int	metadata_parse (FLACContext *s)
	Parse a list of metadata blocks.
static int	flac_decode_init (AVCodecContext *avctx)
static void	dump_headers (FLACContext *s)
static int	decode_residuals (FLACContext *s, int channel, int pred_order)
static int	decode_subframe_fixed (FLACContext *s, int channel, int pred_order)
static int	decode_subframe_lpc (FLACContext *s, int channel, int pred_order)
static int	decode_subframe (FLACContext *s, int channel)
static int	decode_frame (FLACContext *s, int alloc_data_size)
static int	flac_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
static int	flac_decode_close (AVCodecContext *avctx)
static void	flac_flush (AVCodecContext *avctx)
Variables
static int	sample_rate_table []
static int	sample_size_table []
static int	blocksize_table []
AVCodec	flac_decoder

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Enumeration Type Documentation

enum decorrelation_type

Enumerator:

INDEPENDENT
LEFT_SIDE
RIGHT_SIDE
MID_SIDE

Definition at line 51 of file flac.c.

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Function Documentation

static int64_t get_utf8

(

GetBitContext *

gb

)

[static]

Definition at line 91 of file flac.c.

Referenced by decode_frame().

static void metadata_streaminfo

(

FLACContext *

s

)

[static]

Definition at line 146 of file flac.c.

Referenced by flac_decode_init(), and metadata_parse().

static void allocate_buffers

(

FLACContext *

s

)

[static]

Definition at line 129 of file flac.c.

static int metadata_parse

(

FLACContext *

s

)

[static]

Parse a list of metadata blocks.

This list of blocks must begin with the fLaC marker.

Parameters:

s

the flac decoding context containing the gb bit reader used to parse metadata

Returns:

1 if some metadata was read, 0 if no fLaC marker was found

Definition at line 177 of file flac.c.

Referenced by flac_decode_frame(), and flac_decode_init().

static int flac_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 101 of file flac.c.

static void dump_headers

(

FLACContext *

s

)

[static]

Definition at line 120 of file flac.c.

Referenced by metadata_streaminfo().

static int decode_residuals	(	FLACContext *	s,
		int	channel,
		int	pred_order
	)			[static]

Definition at line 214 of file flac.c.

Referenced by decode_subframe_fixed(), and decode_subframe_lpc().

static int decode_subframe_fixed	(	FLACContext *	s,
		int	channel,
		int	pred_order
	)			[static]

Definition at line 260 of file flac.c.

Referenced by decode_subframe().

static int decode_subframe_lpc	(	FLACContext *	s,
		int	channel,
		int	pred_order
	)			[static]

Definition at line 313 of file flac.c.

Referenced by decode_subframe(), and shorten_decode_frame().

static int decode_subframe	(	FLACContext *	s,
		int	channel
	)			[inline, static]

Definition at line 394 of file flac.c.

Referenced by decode_frame().

static int decode_frame	(	FLACContext *	s,
		int	alloc_data_size
	)			[static]

Definition at line 480 of file flac.c.

static int flac_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 590 of file flac.c.

static int flac_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 739 of file flac.c.

static void flac_flush

(

AVCodecContext *

avctx

)

[static]

Definition at line 753 of file flac.c.

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Variable Documentation

int sample_rate_table[] [static]

Initial value:

{ 0, 0, 0, 0,
  8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
  0, 0, 0, 0 }

Definition at line 78 of file flac.c.

Referenced by decode_frame().

int sample_size_table[] [static]

Initial value:

{ 0, 8, 12, 0, 16, 20, 24, 0 }

Definition at line 83 of file flac.c.

Referenced by decode_frame().

int blocksize_table[] [static]

Initial value:

 {
     0,    192, 576<<0, 576<<1, 576<<2, 576<<3,      0,      0,
256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
}

Definition at line 86 of file flac.c.

Referenced by decode_frame().

AVCodec flac_decoder

Initial value:

 {
    "flac",
    CODEC_TYPE_AUDIO,
    CODEC_ID_FLAC,
    sizeof(FLACContext),
    flac_decode_init,
    NULL,
    flac_decode_close,
    flac_decode_frame,
    .flush= flac_flush,
}

Definition at line 760 of file flac.c.