libavcodec/atrac.c File Reference

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

Go to the source code of this file.

Functions
void	atrac_generate_tables (void)
	Generate common tables.
void	atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
	Quadrature mirror synthesis filter.
Variables
float	sf_table [64]
float	qmf_window [48]
static const float	qmf_48tap_half [24]

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Detailed Description

Definition in file atrac.c.

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Function Documentation

void atrac_generate_tables

(

void

)

Generate common tables.

Definition at line 51 of file atrac.c.

Referenced by atrac1_decode_init(), and atrac3_decode_init().

void 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 decodeFrame().

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Variable Documentation

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 atrac_generate_tables().

float qmf_window[48]

Definition at line 36 of file atrac.c.

Referenced by atrac_generate_tables(), and atrac_iqmf().

float sf_table[64]

Definition at line 35 of file atrac.c.

Referenced by at1_unpack_dequant(), atrac_generate_tables(), decodeSpectrum(), and decodeTonalComponents().