You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
2.6 KiB
97 lines
2.6 KiB
15 years ago
|
/*
|
||
|
|
|
||
|
|
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);
|