Partializer.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 "Partializer.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

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

bool Partializer::Do(const Spectrum& in, Spectrum& out)
{
        if (!mConfig.GetPreserveOuts())
        {
                out = in; //TODO big cludge for streaming
        }
        DataArray& inMag = in.GetMagBuffer();
        DataArray& outMag = out.GetMagBuffer();
        
        int spectrumSize = in.GetSize();
        mMag.Resize(spectrumSize);
        mMag.SetSize(spectrumSize);
        
        TData spectralResolution = spectrumSize/in.GetSpectralRange();
        TData freqFactor = mFreqSpaceFactorCtl.GetLastValue();
        int fundamental = Round(mFundamentalCtl.GetLastValue()* spectralResolution);
        TData overallFactor = log2lin(mAmount.GetLastValue());
        int i;
        TData n;
        //first we set everything to 0 (it could be done more efficiently)
        for(i = 0; i<spectrumSize; i++)
        {
                mMag[i] = 0.;
        }
        n = 1.;
        for(i = 0; i<spectrumSize; i++)
        {
                if(i == int (TData(fundamental) * n))
                {
                        mMag[i] = inMag[i]*overallFactor;
                        n*=freqFactor;
                }
        }
        out.SetMagBuffer(mMag);
        return true;
}




}