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.
72 lines
2.0 KiB
72 lines
2.0 KiB
/*
|
|
|
|
Copyright (C) 2000 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., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA.
|
|
|
|
*/
|
|
|
|
#include "artsmodulessynth.h"
|
|
#include "stdsynthmodule.h"
|
|
#include "c_filter_stuff.h"
|
|
|
|
using namespace Arts;
|
|
|
|
class Synth_SHELVE_CUTOFF_impl : virtual public Synth_SHELVE_CUTOFF_skel,
|
|
virtual public StdSynthModule
|
|
{
|
|
protected:
|
|
filter f;
|
|
public:
|
|
void streamInit();
|
|
void calculateBlock(unsigned long samples);
|
|
};
|
|
|
|
REGISTER_IMPLEMENTATION(Synth_SHELVE_CUTOFF_impl);
|
|
|
|
void Synth_SHELVE_CUTOFF_impl::streamInit()
|
|
{
|
|
initfilter(&f);
|
|
}
|
|
|
|
void Synth_SHELVE_CUTOFF_impl::calculateBlock(unsigned long samples)
|
|
{
|
|
float filterfrequency = frequency[0];
|
|
|
|
// the shelve-lowpass-filter is extremely sensitive to frequencies which
|
|
// are out of it's range (it produces NaN's then) so we'll be careful ;)
|
|
if(filterfrequency > 22000.0) filterfrequency = 22000.0;
|
|
if(filterfrequency < 1.0) filterfrequency = 1.0;
|
|
setfilter_shelvelowpass(&f,filterfrequency,80.0);
|
|
|
|
unsigned long i;
|
|
|
|
for(i=0;i<samples;i++)
|
|
{
|
|
// better paste applyfilter here instead of:
|
|
// *outsig++ = 0.95 * applyfilter(&f,*insig++);
|
|
f.x = invalue[i];
|
|
f.y = f.cx * f.x + f.cx1 * f.x1 + f.cx2 * f.x2
|
|
+ f.cy1 * f.y1 + f.cy2 * f.y2;
|
|
f.x2 = f.x1;
|
|
f.x1 = f.x;
|
|
f.y2 = f.y1;
|
|
f.y1 = f.y;
|
|
outvalue[i] = 0.95 * f.y;
|
|
}
|
|
}
|