/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001             *
 * by the XIPHOPHORUS Company http://www.xiph.org/                  *

 ********************************************************************

  function: Direct Form I, II IIR filters, plus some specializations
  last mod: $Id: iir.h,v 1.7 2001/02/26 03:50:41 xiphmont Exp $

 ********************************************************************/

#ifndef _V_IIR_H_
#define _V_IIR_H_

typedef struct {
  int stages;
  float *coeff_A;
  float *coeff_B;
  float *z_A;
  int ring;
  float gain;
} IIR_state;

extern void IIR_init(IIR_state *s,int stages,float gain, float *A, float *B);
extern void IIR_clear(IIR_state *s);
extern float IIR_filter(IIR_state *s,float in);
extern float IIR_filter_Band(IIR_state *s,float in);
extern void IIR_reset(IIR_state *s);

#endif