libavcodec/aacpsy.c File Reference

AAC encoder psychoacoustic model. More...

#include "avcodec.h"
#include "aacpsy.h"
#include "aactab.h"

Go to the source code of this file.

Data Structures
struct	Psy3gppBand
	information for single band used by 3GPP TS26.403-inspired psychoacoustic model More...
struct	Psy3gppCoeffs
	psychoacoustic model frame type-dependent coefficients More...
Defines
#define	PSY_3GPP_SPREAD_LOW   1.5f
	constants for 3GPP AAC psychoacoustic model
#define	PSY_3GPP_SPREAD_HI   3.0f
Typedefs
typedef struct Psy3gppBand	Psy3gppBand
	information for single band used by 3GPP TS26.403-inspired psychoacoustic model
typedef struct Psy3gppCoeffs	Psy3gppCoeffs
	psychoacoustic model frame type-dependent coefficients
Functions
static av_always_inline int	quant (float coef, const float Q)
	Quantize one coefficient.
static float	get_approximate_quant_error (float *c, int size, int scale_idx)
static float	calc_bark (float f)
	Calculate Bark value for given line.

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Detailed Description

AAC encoder psychoacoustic model.

Definition in file aacpsy.c.

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Define Documentation

#define PSY_3GPP_SPREAD_HI   3.0f

Definition at line 75 of file aacpsy.c.

#define PSY_3GPP_SPREAD_LOW   1.5f

constants for 3GPP AAC psychoacoustic model

Definition at line 74 of file aacpsy.c.

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Typedef Documentation

typedef struct Psy3gppBand Psy3gppBand

information for single band used by 3GPP TS26.403-inspired psychoacoustic model

typedef struct Psy3gppCoeffs Psy3gppCoeffs

psychoacoustic model frame type-dependent coefficients

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Function Documentation

static float calc_bark

(

float

f

)

[inline, static]

Calculate Bark value for given line.

Definition at line 101 of file aacpsy.c.

static float get_approximate_quant_error	(	float *	c,
		int	size,
		int	scale_idx
	)			[inline, static]

Definition at line 54 of file aacpsy.c.

static av_always_inline int quant	(	float	coef,
		const float	Q
	)			[static]

Quantize one coefficient.

Returns:

absolute value of the quantized coefficient

See also:

3GPP TS26.403 5.6.2 "Scalefactor determination"

Definition at line 49 of file aacpsy.c.