RandomPhase.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 "RandomPhase.hxx"
#include "ProcessingFactory.hxx"

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


bool RandomPhase::Do(const Spectrum& in, Spectrum& out)
{
        srand(time(0));

        out = in; 

        float amount = mAmount.GetLastValue() * 0.01;
        float invAmount = 1. - amount;
        DataArray& oPhase = out.GetPhaseBuffer();
        
        int spectrumSize = in.GetSize();
        
        int k = TWO_PI / RAND_MAX;
        for(int i = 0; i<spectrumSize; i++)
        {
                oPhase[i] = oPhase[i]*invAmount + rand()* k * amount;
        }
        return true;
}



}