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Viewing changes to arts/modules/synth_shelve_cutoff_impl.cc

  • Committer: Bazaar Package Importer
  • Author(s): Martin Schulze
  • Date: 2003-01-22 15:00:51 UTC
  • Revision ID: james.westby@ubuntu.com-20030122150051-uihwkdoxf15mi1tn
Tags: upstream-2.2.2
Import upstream version 2.2.2

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arts/modules/synth_shelve_cutoff_impl.cc
 
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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 "artsmodules.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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}