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/* 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_B_REVERB_MODEL_H
#define MT32EMU_B_REVERB_MODEL_H
namespace MT32Emu {
struct BReverbSettings {
const Bit32u numberOfAllpasses;
const Bit32u * const allpassSizes;
const Bit32u numberOfCombs;
const Bit32u * const combSizes;
const Bit32u * const outLPositions;
const Bit32u * const outRPositions;
const Bit32u * const filterFactors;
const Bit32u * const feedbackFactors;
const Bit32u * const dryAmps;
const Bit32u * const wetLevels;
const Bit32u lpfAmp;
};
class RingBuffer {
protected:
Sample *buffer;
const Bit32u size;
Bit32u index;
public:
RingBuffer(const Bit32u size);
virtual ~RingBuffer();
Sample next();
bool isEmpty() const;
void mute();
};
class AllpassFilter : public RingBuffer {
public:
AllpassFilter(const Bit32u size);
Sample process(const Sample in);
};
class CombFilter : public RingBuffer {
protected:
const Bit32u filterFactor;
Bit32u feedbackFactor;
public:
CombFilter(const Bit32u size, const Bit32u useFilterFactor);
virtual void process(const Sample in);
Sample getOutputAt(const Bit32u outIndex) const;
void setFeedbackFactor(const Bit32u useFeedbackFactor);
};
class DelayWithLowPassFilter : public CombFilter {
Bit32u amp;
public:
DelayWithLowPassFilter(const Bit32u useSize, const Bit32u useFilterFactor, const Bit32u useAmp);
void process(const Sample in);
void setFeedbackFactor(const Bit32u) {}
};
class TapDelayCombFilter : public CombFilter {
Bit32u outL;
Bit32u outR;
public:
TapDelayCombFilter(const Bit32u useSize, const Bit32u useFilterFactor);
void process(const Sample in);
Sample getLeftOutput() const;
Sample getRightOutput() const;
void setOutputPositions(const Bit32u useOutL, const Bit32u useOutR);
};
class BReverbModel {
AllpassFilter **allpasses;
CombFilter **combs;
const BReverbSettings ¤tSettings;
const bool tapDelayMode;
Bit32u dryAmp;
Bit32u wetLevel;
void mute();
public:
BReverbModel(const ReverbMode mode);
~BReverbModel();
// After construction or a close(), open() must be called at least once before any other call (with the exception of close()).
void open();
// May be called multiple times without an open() in between.
void close();
void setParameters(Bit8u time, Bit8u level);
void process(const Sample *inLeft, const Sample *inRight, Sample *outLeft, Sample *outRight, unsigned long numSamples);
bool isActive() const;
};
}
#endif
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