SpectralSpread.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 "SpectralSpread.hxx"
#include "ProcessingFactory.hxx"

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

bool SpectralSpread::Do(const Spectrum& 
                        inSpec,Spectrum& outSpec)
{

        if (!mConfig.GetPreserveOuts())
        {
                outSpec = inSpec; //TODO big cludge for streaming
        }
        
        int spectrumSize = inSpec.GetSize();
        TData spectralResolution = spectrumSize/inSpec.GetSpectralRange();
        
        int centerPoint = Round (mCenterFreqCtl.GetLastValue()*spectralResolution);
        int amount= Round(mAmount.GetLastValue()*spectralResolution);
        
        mBPFSpectrum.SetSize(spectrumSize);
        
        
        //Shift spectral shape
        Array<Point>& magBPF=mBPFSpectrum.GetMagBPF().GetPointArray();
        //magBPF.SetIntpType(EInterpolation::eLinear);
        Array<Point>& phaseBPF=mBPFSpectrum.GetPhaseBPF().GetPointArray();
        //phaseBPF.SetIntpType(EInterpolation::eLinear);
        
        magBPF.SetSize(0);
        phaseBPF.SetSize(0);
        
        DataArray& inMag = inSpec.GetMagBuffer();
        DataArray& inPhase = inSpec.GetPhaseBuffer();
        
        TData binWidth = 1./spectralResolution;
        int i;
        TData freq = 0;
        TData mag;
        TData phase;
        int nPoints = 0;
        for (i=0; i<centerPoint-amount; i++)
        {
                mag = inMag[i+amount]; 
                phase = inPhase[i+amount];
                magBPF.AddElem(Point(freq,mag));
                phaseBPF.AddElem(Point(freq, phase));
                freq += binWidth;
                nPoints++;
        }
        
        freq = centerPoint * binWidth;
        magBPF.AddElem(Point(freq, inMag[centerPoint]));
        phaseBPF.AddElem(Point(freq, inPhase[centerPoint]));
        nPoints++;
        
        freq = (centerPoint+amount)*binWidth;
        
        for (i=centerPoint+amount ; i<spectrumSize; i++)
        {
                mag = inMag[i-amount]; 
                phase = inPhase[i-amount];
                magBPF.AddElem(Point(freq,mag));
                phaseBPF.AddElem(Point(freq, phase));
                freq += binWidth;
                nPoints++;
        }
        
        mBPFSpectrum.SetBPFSize(nPoints);
        mBPFSpectrum.SynchronizeTo(mFlag);
        outSpec.SetMagBuffer(mBPFSpectrum.GetMagBuffer());
        outSpec.SetPhaseBuffer(mBPFSpectrum.GetPhaseBuffer());
        
        return true;
}


}