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/*
Copyright (C) 2000 Jeff Tranter
tranter@pobox.com
Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <math.h>
#include "artsmodulessynth.h"
#include "stdsynthmodule.h"
using namespace Arts;
class Synth_FX_CFLANGER_impl : virtual public Synth_FX_CFLANGER_skel,
virtual public StdSynthModule
{
protected:
float _mintime;
float _maxtime;
enum { SAMPLINGRATE = 44100, MAXDELAY = 44100 };
float *dbuffer;
unsigned long dbpos;
float center;
float range;
public:
Synth_FX_CFLANGER_impl()
{
dbuffer=new float[MAXDELAY];
}
~Synth_FX_CFLANGER_impl()
{
delete [] dbuffer;
}
float mintime() { return _mintime; }
void mintime(float newMintime) { _mintime = newMintime; }
float maxtime() { return _maxtime; }
void maxtime(float newMaxtime) { _maxtime = newMaxtime; }
void streamInit()
{
center = (_maxtime + _mintime) / 2;
range = _maxtime - center;
for (int i=0; i<MAXDELAY; i++)
dbuffer[i] = 0;
dbpos = 0;
}
void calculateBlock(unsigned long samples)
{
unsigned long i;
float delay, floor_delay;
long start_pos, end_pos;
float start_val, end_val;
for(i=0; i<samples; i++)
{
dbuffer[dbpos] = invalue[i];
// Delaytime i.e. = 35ms + (+/- LFO[-1 bis 1] * 15ms) / 1000 * 44100
delay = ((center + (lfo[i] * range)) / 1000.0) * (float) SAMPLINGRATE;
floor_delay = floor(delay);
start_pos = dbpos - (long)(floor_delay);
end_pos = start_pos-1;
if (start_pos < 0) start_pos += MAXDELAY; // wrapping exception
if (end_pos < 0) end_pos += MAXDELAY;
start_val = dbuffer[start_pos];
end_val = dbuffer[end_pos];
outvalue[i] = start_val + ((delay - floor_delay) * (end_val - start_val));
dbpos++;
if (dbpos == MAXDELAY) dbpos = 0;
}
}
};
REGISTER_IMPLEMENTATION(Synth_FX_CFLANGER_impl);
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