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