Carla/source/backend/native/zynaddsubfx/Effects/Chorus.h

/*
  ZynAddSubFX - a software synthesizer

  Chorus.h - Chorus and Flange effects
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program 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.

  This program 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 (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef CHORUS_H
#define CHORUS_H
#include "Effect.h"
#include "EffectLFO.h"
#include "../Misc/Stereo.h"

#define MAX_CHORUS_DELAY 250.0f //ms

/**Chorus and Flange effects*/
class Chorus:public Effect
{
    public:
        Chorus(bool insertion_, float *efxoutl_, float *efxoutr_);
        /**Destructor*/
        ~Chorus();
        void out(const Stereo<float *> &input);
        void setpreset(unsigned char npreset);
        /**
         * Sets the value of the chosen variable
         *
         * The possible parameters are:
         *   -# Volume
         *   -# Panning
         *   -# LFO Frequency
         *   -# LFO Randomness
         *   -# LFO Type
         *   -# LFO stereo
         *   -# Depth
         *   -# Delay
         *   -# Feedback
         *   -# Flange Mode
         *   -# Subtractive
         * @param npar number of chosen parameter
         * @param value the new value
         */
        void changepar(int npar, unsigned char value);
        /**
         * Gets the value of the chosen variable
         *
         * The possible parameters are:
         *   -# Volume
         *   -# Panning
         *   -# LFO Frequency
         *   -# LFO Randomness
         *   -# LFO Type
         *   -# LFO stereo
         *   -# Depth
         *   -# Delay
         *   -# Feedback
         *   -# Flange Mode
         *   -# Subtractive
         * @param npar number of chosen parameter
         * @return the value of the parameter
         */
        unsigned char getpar(int npar) const;
        void cleanup(void);

    private:
        //Chorus Parameters
        unsigned char Pvolume;
        unsigned char Pdepth;      //the depth of the Chorus(ms)
        unsigned char Pdelay;      //the delay (ms)
        unsigned char Pfb;         //feedback
        unsigned char Pflangemode; //how the LFO is scaled, to result chorus or flange
        unsigned char Poutsub;     //if I wish to substract the output instead of the adding it
        EffectLFO     lfo;         //lfo-ul chorus


        //Parameter Controls
        void setvolume(unsigned char _Pvolume);
        void setdepth(unsigned char _Pdepth);
        void setdelay(unsigned char _Pdelay);
        void setfb(unsigned char _Pfb);

        //Internal Values
        float depth, delay, fb;
        float dl1, dl2, dr1, dr2, lfol, lfor;
        int   maxdelay;
        Stereo<float *> delaySample;
        int dlk, drk, dlhi;
        float getdelay(float xlfo);
};

#endif