/home/marsyas/marsyas/src/marsyas/PvConvolve.cpp

/*
** Copyright (C) 1998-2006 George Tzanetakis <gtzan@cs.uvic.ca>
**  
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
** 
** This program 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 General Public License for more details.
** 
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software 
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include "PvConvolve.h"

using std::ostringstream;
using namespace Marsyas;

PvConvolve::PvConvolve(mrs_string name):MarSystem("PvConvolve",name)
{
  //type_ = "PvConvolve";
  //name_ = name;
}


PvConvolve::~PvConvolve()
{
}

MarSystem* 
PvConvolve::clone() const 
{
  return new PvConvolve(*this);
}


void
PvConvolve::myUpdate(MarControlPtr sender)
{
    (void) sender;
  setctrl("mrs_natural/onSamples", getctrl("mrs_natural/inSamples"));
  setctrl("mrs_natural/onObservations", getctrl("mrs_natural/inObservations")->to<mrs_natural>() / 2);
  setctrl("mrs_real/osrate", getctrl("mrs_real/israte")->to<mrs_real>());
}

void 
PvConvolve::myProcess(realvec& in, realvec& out)
{
   //checkFlow(in,out); 


  mrs_natural N2 = onObservations_ / 2;
  mrs_real sqN = (mrs_real)N2 * N2;
  
  mrs_real r1, i1, r2, i2;
  
  for (mrs_natural o=0; o < N2; o++)  
    {
      
      if (o==0) 
    {
      r1 = in(2*o,0);
      i1 = 0.0;
      r2 = in(2*o + onObservations_, 0);
      i2 = 0.0;
      out(2*o, 0) = r1 * r2;
    }
      else if (o == N2) 
    {
      r1 = in(1,0);
      i1 = 0.0;
      r2 = in(1 + onObservations_, 0);
      i2 = 0.0;
      out(1,0) = r1 * r2;
    }
      else
    {
      r1 = in(2*o,0);
      i1 = in(2*o+1,0);
      r2 = in(2*o + onObservations_, 0);
      i2 = in(2*o+1 + onObservations_, 0);
      
      out(2*o,0) = (r1 * r2 - i1 * i2) * sqN;
      out(2*o+1, 0) = (r1 * i2 + r2 * i1) * sqN;
      
      // out(2*o,0) = r1;
      // out(2*o+1, 0) = i1;
      
    }
      


    }
  

  


  
}






    

    

    
    
      
    

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