src/mt32/AReverbModel.h

/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
 * Copyright (C) 2011, 2012, 2013 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MT32EMU_A_REVERB_MODEL_H
#define MT32EMU_A_REVERB_MODEL_H

namespace MT32Emu {

struct AReverbSettings {
        const Bit32u * const allpassSizes;
        const Bit32u * const combSizes;
        const Bit32u * const outLPositions;
        const Bit32u * const outRPositions;
        const Bit32u * const filterFactor;
        const Bit32u * const decayTimes;
        const Bit32u * const wetLevels;
        const Bit32u lpfAmp;
};

class RingBuffer {
protected:
        float *buffer;
        const Bit32u size;
        Bit32u index;

public:
        RingBuffer(const Bit32u newsize);
        virtual ~RingBuffer();
        float next();
        bool isEmpty() const;
        void mute();
};

class AllpassFilter : public RingBuffer {
public:
        AllpassFilter(const Bit32u useSize);
        float process(const float in);
};

class CombFilter : public RingBuffer {
        float feedbackFactor;
        float filterFactor;

public:
        CombFilter(const Bit32u useSize);
        void process(const float in);
        float getOutputAt(const Bit32u outIndex) const;
        void setFeedbackFactor(const float useFeedbackFactor);
        void setFilterFactor(const float useFilterFactor);
};

class AReverbModel : public ReverbModel {
        AllpassFilter **allpasses;
        CombFilter **combs;

        const AReverbSettings &currentSettings;
        float lpfAmp;
        float wetLevel;
        void mute();

public:
        AReverbModel(const ReverbMode mode);
        ~AReverbModel();
        void open();
        void close();
        void setParameters(Bit8u time, Bit8u level);
        void process(const float *inLeft, const float *inRight, float *outLeft, float *outRight, unsigned long numSamples);
        bool isActive() const;
};

}

#endif