FFTFilter.h

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/*
 * Copyright (C) 2014-2016 David McGriffy, all rights reserved
 */

#ifndef FFTFILTER_H_INCLUDED
#define FFTFILTER_H_INCLUDED

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

#include "FFTReal.h"
#include "Filter.h"
#include "FilterCoefficients.h"

class CFFTFilter : protected CFilter
{
public:
    CFFTFilter();                   
    CFFTFilter(bool minPhase);      
    virtual ~CFFTFilter();          
    void setCoefficients(CFilterCoefficients *coef);    
    void setSamplingRate(float sr);                     
    bool canProcess();                                  
    void setMinPhase(bool newMinPhase);                 
    bool getMinPhase();                                 
    void doFilter(float *node, long sampleframes);      
    void clearBuffers();                                
protected:
    void init();            

    // filter buffers and such
    CFilterCoefficients *m_coefficients;
    unsigned int m_nFiltSize;
    bool m_bMinPhase;

    FFTReal *m_fft;

// fixed at double the buffer size
#define KSMPS (1024)
#define MAXFFTFILTSIZE (2 * KSMPS)
    FFTReal::flt_t m_fBuffer [MAXFFTFILTSIZE];
    FFTReal::flt_t m_fSaveBuffer [MAXFFTFILTSIZE];
    FFTReal::flt_t m_fOutBuffer [MAXFFTFILTSIZE];
    unsigned int m_nBufPos;

    FFTReal::flt_t m_fFreqCoefs[MAXFFTFILTSIZE];
    FFTReal::flt_t m_fCoefficients[MAXFFTFILTSIZE];
    FFTReal::flt_t m_fFreqBuf[MAXFFTFILTSIZE];
};

#endif