ShelfFilterI.h

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/*
 * Copyright (C) 2013 David McGriffy, all rights reserved
 */

#ifndef SHELFFILTERI_H_INCLUDED
#define SHELFFILTERI_H_INCLUDED

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "IIRFilter.h"

class CShelfFilterI : public CIIRFilter  
{
public:
    CShelfFilterI();                                    
    CShelfFilterI(float dCenterFreq, float dBGain);     
    virtual ~CShelfFilterI();                           
    void setSamplingRate(float sr);                     
    void doFilter(float *node, long sampleFrames);      
    void setCenterFreq(float dCenterFreq);              
    void setHighBandGain(float dBGain);                 
protected:
    void init();
    void updateCoefficients();

    float m_dCenterFreq;
    float m_dBGain;

    double a1, b0, b1, y0, x0, x1;
    double a1z, b0z, b1z;
    double a1d, b0d, b1d;
    bool firstBlock;
};

#endif // !defined(AFX_SHELFFILTERI_H__72425CC7_65F2_42D2_BE62_253D0D373277__INCLUDED_)