atrac.c File Reference

#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include "avcodec.h"
#include "atrac.h"

Functions
av_cold void	ff_atrac_generate_tables (void)
	Generate common tables.
av_cold 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]

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()

av_cold 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