Peakalizer.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 "Peakalizer.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

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

bool Peakalizer::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);
        
        //control is supposed to be in dB's
        TData threshold = log2lin(mThresholdCtl.GetLastValue());
        
        TData spectralResolution = spectrumSize/in.GetSpectralRange();
        int bandwidth = Round(mBandWidthCtl.GetLastValue()* spectralResolution*0.5);
        
        int i,n;
        //first we set everything to 0 (it could be done more efficiently)
        for(i = 0; i<spectrumSize; i++)
        {
                mMag[i] = 0.;
        }
        for(i = 0; i<spectrumSize; i++)
        {
                if(inMag[i] > threshold)
                {
                        for(n = i-bandwidth; n < i+bandwidth; n++)
                        {
                                mMag[n] = inMag[n];
                        }
                }
        }
        out.SetMagBuffer(mMag);
        return true;
}



}