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97 lines
2.6 KiB
97 lines
2.6 KiB
/*
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Copyright (C) 2000 Jeff Tranter
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tranter@pobox.com
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Stefan Westerfeld
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stefan@space.twc.de
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <math.h>
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#include "artsmodulessynth.h"
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#include "stdsynthmodule.h"
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using namespace Arts;
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class Synth_FX_CFLANGER_impl : virtual public Synth_FX_CFLANGER_skel,
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virtual public StdSynthModule
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{
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protected:
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float _mintime;
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float _maxtime;
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enum { SAMPLINGRATE = 44100, MAXDELAY = 44100 };
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float *dbuffer;
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unsigned long dbpos;
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float center;
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float range;
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public:
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Synth_FX_CFLANGER_impl()
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{
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dbuffer=new float[MAXDELAY];
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}
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~Synth_FX_CFLANGER_impl()
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{
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delete [] dbuffer;
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}
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float mintime() { return _mintime; }
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void mintime(float newMintime) { _mintime = newMintime; }
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float maxtime() { return _maxtime; }
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void maxtime(float newMaxtime) { _maxtime = newMaxtime; }
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void streamInit()
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{
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center = (_maxtime + _mintime) / 2;
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range = _maxtime - center;
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for (int i=0; i<MAXDELAY; i++)
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dbuffer[i] = 0;
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dbpos = 0;
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}
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void calculateBlock(unsigned long samples)
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{
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unsigned long i;
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float delay, floor_delay;
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long start_pos, end_pos;
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float start_val, end_val;
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for(i=0; i<samples; i++)
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{
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dbuffer[dbpos] = invalue[i];
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// Delaytime i.e. = 35ms + (+/- LFO[-1 bis 1] * 15ms) / 1000 * 44100
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delay = ((center + (lfo[i] * range)) / 1000.0) * (float) SAMPLINGRATE;
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floor_delay = floor(delay);
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start_pos = dbpos - (long)(floor_delay);
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end_pos = start_pos-1;
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if (start_pos < 0) start_pos += MAXDELAY; // wrapping exception
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if (end_pos < 0) end_pos += MAXDELAY;
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start_val = dbuffer[start_pos];
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end_val = dbuffer[end_pos];
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outvalue[i] = start_val + ((delay - floor_delay) * (end_val - start_val));
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dbpos++;
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if (dbpos == MAXDELAY) dbpos = 0;
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}
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}
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};
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REGISTER_IMPLEMENTATION(Synth_FX_CFLANGER_impl);
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