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  • Committer: tuehaste
  • Date: 2002-02-26 11:12:07 UTC
  • Revision ID: vcs-imports@canonical.com-20020226111207-5rly26cj9gdd19ba
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mixxx/mixxx/engineIIRfilter.cpp
 
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#include "engineIIRfilter.h"
 
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EngineIIRfilter::EngineIIRfilter(int potmeter_midi, int button_midi,
 
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                                 int button_bit, MidiObject *midi, const double *_coefs) {
 
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  //  Initialize the buttons:
 
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  killbutton = new ControlPushButton("kill", simulated_latching, button_midi,
 
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                                     button_bit, midi);
 
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  connect(killbutton, SIGNAL(valueChanged(valueType)), this, SLOT(slotUpdate()));
 
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  filterpot = new ControlPotmeter("filterpot", potmeter_midi, midi, 0., 2.);
 
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  connect(filterpot, SIGNAL(valueChanged(FLOAT)), this, SLOT(slotUpdate()));
 
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  coefs = _coefs;
 
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}
 
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EngineIIRfilter::~EngineIIRfilter() {
 
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  delete killbutton;
 
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  delete filterpot;
 
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}
 
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void EngineIIRfilter::process(CSAMPLE *source, CSAMPLE *destination, int buf_size) {
 
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  double GAIN =  coefs[0];
 
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  for (int i=0; i<buf_size; i++) {
 
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    xv[0] = xv[1]; xv[1] = xv[2]; xv[2] = xv[3]; xv[3] = xv[4];
 
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    xv[4] = xv[5]; xv[5] = xv[6]; xv[6] = xv[7]; xv[7] = xv[8]; 
 
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    xv[8] = source[i] / GAIN;
 
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    yv[0] = yv[1]; yv[1] = yv[2]; yv[2] = yv[3]; yv[3] = yv[4];
 
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    yv[4] = yv[5]; yv[5] = yv[6]; yv[6] = yv[7]; yv[7] = yv[8]; 
 
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    yv[8] =   (xv[0] + xv[8]) + coefs[1] * (xv[1] + xv[7]) + 
 
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        coefs[2] * (xv[2] + xv[6])
 
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        + coefs[3] * (xv[3] + xv[5]) + coefs[4] * xv[4]
 
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        + (coefs[5] * yv[0]) + ( coefs[6] * yv[1])
 
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        + (coefs[7] * yv[2]) + ( coefs[8] * yv[3])
 
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        + (coefs[9] * yv[4]) + ( coefs[10] * yv[5])
 
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        + (coefs[11] * yv[6]) + ( coefs[12] * yv[7]);
 
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    destination[i] += (gain-1)*yv[8];
 
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  }
 
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}
 
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void EngineIIRfilter::slotUpdate() {
 
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  // We've been called when either the killbutton or the potmeter has
 
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  // been touched. We have to check both.
 
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  if (killbutton->getValue()==down)
 
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    gain = 0;
 
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  else
 
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    gain = filterpot->getValue();
 
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}