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72 lines
2.0 KiB
72 lines
2.0 KiB
15 years ago
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/*
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Copyright (C) 2000 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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include "artsmodulessynth.h"
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#include "stdsynthmodule.h"
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#include "c_filter_stuff.h"
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using namespace Arts;
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class Synth_SHELVE_CUTOFF_impl : virtual public Synth_SHELVE_CUTOFF_skel,
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virtual public StdSynthModule
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{
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protected:
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filter f;
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public:
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void streamInit();
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void calculateBlock(unsigned long samples);
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};
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REGISTER_IMPLEMENTATION(Synth_SHELVE_CUTOFF_impl);
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void Synth_SHELVE_CUTOFF_impl::streamInit()
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{
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initfilter(&f);
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}
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void Synth_SHELVE_CUTOFF_impl::calculateBlock(unsigned long samples)
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{
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float filterfrequency = frequency[0];
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// the shelve-lowpass-filter is extremely sensitive to frequencies which
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// are out of it's range (it produces NaN's then) so we'll be careful ;)
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if(filterfrequency > 22000.0) filterfrequency = 22000.0;
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if(filterfrequency < 1.0) filterfrequency = 1.0;
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setfilter_shelvelowpass(&f,filterfrequency,80.0);
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unsigned long i;
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for(i=0;i<samples;i++)
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{
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// better paste applyfilter here instead of:
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// *outsig++ = 0.95 * applyfilter(&f,*insig++);
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f.x = invalue[i];
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f.y = f.cx * f.x + f.cx1 * f.x1 + f.cx2 * f.x2
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+ f.cy1 * f.y1 + f.cy2 * f.y2;
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f.x2 = f.x1;
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f.x1 = f.x;
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f.y2 = f.y1;
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f.y1 = f.y;
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outvalue[i] = 0.95 * f.y;
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}
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}
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