SMSOddEvenHarmonicRatio.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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 "SMSOddEvenHarmonicRatio.hxx"
#include "ProcessingFactory.hxx"



namespace CLAM
{

namespace Hidden
{
        static const char * metadata[] = {
                "key", "SMSOddEvenHarmonicRatio",
                "category", "SMS Transformations",
                "description", "SMSOddEvenHarmonicRatio",
                0
        };
        static FactoryRegistrator<ProcessingFactory, SMSOddEvenHarmonicRatio> reg = metadata;
}


bool SMSOddEvenHarmonicRatio::Do(const SpectralPeakArray& in, SpectralPeakArray& out)
{
        out = in; // TODO big cludge for streaming refactoring
        DataArray& iMagArray=in.GetMagBuffer();
        DataArray& oMagArray=out.GetMagBuffer();
        TSize nPeaks=in.GetnPeaks();
        TData oddFactor=mOddFactor.GetLastValue()*0.5;
        TData evenFactor=-oddFactor;

        for(int i=0;i<nPeaks-1;i+=2)
        {
                oMagArray[i]=std::min(iMagArray[i]+oddFactor,TData(0));
                oMagArray[i+1]=std::min(iMagArray[i+1]+evenFactor,TData(0));
        }
        return true;
}

}