SpectralLimiter.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 "SpectralLimiter.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

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

bool SpectralLimiter::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();
        
        //control is supposed to be in dB's
        TData limit = log2lin(mAmount.GetLastValue());
        int i;  
        for(i = 0; i<spectrumSize; i++)
        {
                if(inMag[i] > limit) outMag[i] = limit;
                else outMag[i] = inMag[i];
        }
        return true;
}


}