atrac.h File Reference

ATRAC common header. More...

Go to the source code of this file.

Classes
struct	AtracGainInfo
	Gain control parameters for one subband. More...
struct	AtracGCContext
	Gain compensation context structure. More...

Typedefs
typedef struct AtracGainInfo	AtracGainInfo
	Gain control parameters for one subband.
typedef struct AtracGCContext	AtracGCContext
	Gain compensation context structure.

Functions
void	ff_atrac_generate_tables (void)
	Generate common tables.
void	ff_atrac_init_gain_compensation (AtracGCContext *gctx, int id2exp_offset, int loc_scale)
	Initialize gain compensation context. More...
void	ff_atrac_gain_compensation (AtracGCContext *gctx, float *in, float *prev, AtracGainInfo *gc_now, AtracGainInfo *gc_next, int num_samples, float *out)
	Apply gain compensation and perform the MDCT overlapping part. More...
void	ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
	Quadrature mirror synthesis filter. More...

Variables
float	ff_atrac_sf_table [64]

Detailed Description

ATRAC common header.

Function Documentation

ff_atrac_gain_compensation()

void ff_atrac_gain_compensation	(	AtracGCContext *	gctx,
		float *	in,
		float *	prev,
		AtracGainInfo *	gc_now,
		AtracGainInfo *	gc_next,
		int	num_samples,
		float *	out
	)

Apply gain compensation and perform the MDCT overlapping part.

Parameters

gctx	pointer to gain compensation context
in	input buffer
prev	previous buffer to perform overlap against
gc_now	gain control information for current frame
gc_next	gain control information for next frame
num_samples	number of samples to process
out	output data goes here

ff_atrac_init_gain_compensation()

void ff_atrac_init_gain_compensation	(	AtracGCContext *	gctx,
		int	id2exp_offset,
		int	loc_scale
	)

Initialize gain compensation context.

Parameters

gctx	pointer to gain compensation context to initialize
id2exp_offset	offset for converting level index into level exponent
loc_scale	location size factor

ff_atrac_iqmf()

void ff_atrac_iqmf	(	float *	inlo,
		float *	inhi,
		unsigned int	nIn,
		float *	pOut,
		float *	delayBuf,
		float *	temp
	)

Quadrature mirror synthesis filter.

Parameters

inlo	lower part of spectrum
inhi	higher part of spectrum
nIn	size of spectrum buffer
pOut	out buffer
delayBuf	delayBuf buffer
temp	temp buffer