atrac.c File Reference

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

Go to the source code of this file.

Functions
void	ff_atrac_generate_tables (void)
	Generate common tables.
void	ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
	Quadrature mirror synthesis filter.

Variables
float	ff_atrac_sf_table [64]
static float	qmf_window [48]
static const float	qmf_48tap_half [24]

Function Documentation

void ff_atrac_generate_tables

(

void

)

Generate common tables.

Definition at line 51 of file atrac.c.

Referenced by atrac1_decode_init(), and atrac3_init_static_data().

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

Definition at line 82 of file atrac.c.

Referenced by at1_subband_synthesis(), and decode_frame().

Variable Documentation

float ff_atrac_sf_table[64]

Definition at line 35 of file atrac.c.

Referenced by at1_unpack_dequant(), decode_spectrum(), decode_tonal_components(), and ff_atrac_generate_tables().

float qmf_window[48]

static

Definition at line 36 of file atrac.c.

Referenced by ff_atrac_generate_tables(), and ff_atrac_iqmf().

const float qmf_48tap_half[24]

static

Initial value:

= {
   -0.00001461907, -0.00009205479,-0.000056157569,0.00030117269,
    0.0002422519,  -0.00085293897,-0.0005205574,  0.0020340169,
    0.00078333891, -0.0042153862, -0.00075614988, 0.0078402944,
   -0.000061169922,-0.01344162,    0.0024626821,  0.021736089,
   -0.007801671,   -0.034090221,   0.01880949,    0.054326009,
   -0.043596379,   -0.099384367,   0.13207909,    0.46424159
}

Definition at line 38 of file atrac.c.

Referenced by ff_atrac_generate_tables().