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SVFilter.h

/*
    SVFilter.h - Several state-variable filters

    Original ZynAddSubFX author Nasca Octavian Paul
    Copyright (C) 2002-2005 Nasca Octavian Paul

    This file is part of yoshimi, which is free software: you can redistribute
    it and/or modify it under the terms of version 2 of the GNU General Public
    License as published by the Free Software Foundation.

    yoshimi is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE.   See the GNU General Public License (version 2 or
    later) for more details.

    You should have received a copy of the GNU General Public License along with
    yoshimi; if not, write to the Free Software Foundation, Inc., 51 Franklin
    Street, Fifth Floor, Boston, MA  02110-1301, USA.

    This file is a derivative of the ZynAddSubFX original, modified October 2009
*/

#ifndef SV_FILTER_H
#define SV_FILTER_H

#include "DSP/Filter_.h"

class SVFilter : public Filter_
{
    public:
        SVFilter(unsigned char Ftype, float Ffreq, float Fq,
                 unsigned char Fstages);
        ~SVFilter() { };
        void filterout(float *smp);
        void setfreq(float frequency);
        void setfreq_and_q(float frequency, float q_);
        void setq(float q_);

        void settype(int type_);
        void setgain(float dBgain);
        void setstages(int stages_);
        void cleanup();

    private:
        struct fstage {
            float low, high, band, notch;
        } st[MAX_FILTER_STAGES + 1];

        struct parameters {
            float f, q, q_sqrt;
        } par, ipar;

        void singlefilterout(float *smp, fstage &x, parameters &par);
        void computefiltercoefs(void);
        int type;      // The type of the filter (LPF1,HPF1,LPF2,HPF2...)
        int stages;    // how many times the filter is applied (0->1,1->2,etc.)
        float freq; // Frequency given in Hz
        float q;    // Q factor (resonance or Q factor)
        float gain; // the gain of the filter (if are shelf/peak) filters

        int abovenq;   // this is 1 if the frequency is above the nyquist
        int oldabovenq;
        int needsinterpolation, firsttime;
};

#endif

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