Deesser.cxx

Go to the documentation of this file.

/*
 * 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 "Deesser.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

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

bool Deesser::Do(const Spectrum& in, Spectrum& out)
{
        out = in; //even if out needs to be preserved, we need to copy content
        
        DataArray& oMag = out.GetMagBuffer();
        DataArray& iMag = in.GetMagBuffer();
        
        int spectrumSize = in.GetSize();
        
        TData spectralResolution = spectrumSize/in.GetSpectralRange();
        
        int lowCutoff = Round(mLowCutoffFreqCtl.GetLastValue()* spectralResolution);
        int highCutoff =        Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution);
        
        TData midFreq = mLowCutoffFreqCtl.GetLastValue()+(mHighCutoffFreqCtl.GetLastValue()-mLowCutoffFreqCtl.GetLastValue())*0.5;
        SendFloatToInControl(mNotch,"Amount",midFreq);
        SendFloatToInControl(mNotch,"Bandwidth",mHighCutoffFreqCtl.GetLastValue()-mLowCutoffFreqCtl.GetLastValue());

        //note: control is supposed to be sent as dB's
        TData threshold =       log2lin(mThresholdCtl.GetLastValue());
        
        int i;
        TData maxMag = 0;
        for( i = lowCutoff; i<highCutoff; i++)
        {
                if(iMag[i]>threshold) oMag[i] = threshold;
                /*if(iMag[i]>threshold && iMag[i]>maxMag)
                //use difference from the threshold to control gain of the Notch
                        maxMag = iMag[i];*/
        }
        /*if (maxMag>0) {
                mNotch.GetInControl("Gain").DoControl(DB(threshold/maxMag));
                mNotch.Do(out,out);
        }*/
        return true;
}


}