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/********************************************************************
* *
* THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
* THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
* PLEASE READ THESE TERMS DISTRIBUTING. *
* *
* THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
* by Monty <monty@xiph.org> and The XIPHOPHORUS Company *
* http://www.xiph.org/ *
* *
********************************************************************
function: Direct Form I, II IIR filters, plus some specializations
last mod: $Id$
********************************************************************/
#ifndef _V_IIR_H_
#define _V_IIR_H_
typedef struct {
int stages;
double *coeff_A;
double *coeff_B;
double *z_A;
double *z_B;
int ring;
double gain;
} IIR_state;
void IIR_init(IIR_state *s,int stages,double gain, double *A, double *B);
void IIR_clear(IIR_state *s);
double IIR_filter(IIR_state *s,double in);
double IIR_filter_ChebBand(IIR_state *s,double in);
#endif
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