CircularPeaksToPCP.hxx

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/*
 * Copyright (c) 2001-2006 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
 *
 */

#ifndef CircularPeaksToPCP_hxx
#define CircularPeaksToPCP_hxx
#include <list>
#include <vector>
#include <cmath>

namespace Simac
{

class CircularPeaksToPCP
{
public:
        typedef std::vector<std::pair<double, double> > PeakList;
        typedef std::vector<double> PCP;
private:
        PCP _output;
        bool _windowingActivated;
        static const unsigned nSemitones=12;
public:
        CircularPeaksToPCP()
        {
                _output.resize(nSemitones);
                _windowingActivated=false;
        }
        ~CircularPeaksToPCP()
        {
        }
        void activateWindowing()
        {
                _windowingActivated=true;
        }
        static double windowedValue(double position, double value)
        {
                return value* (0.54 - 0.46*std::cos(2*M_PI*(position+.5)));
        }
        void doIt(const PeakList & peaks)
        {
                for (unsigned i=0; i<nSemitones; i++)
                        _output[i]=0;
                const unsigned nPeaks=peaks.size();
                for (unsigned i=0; i<nPeaks; i++)
                {
                        int quantizedSemitone = int(peaks[i].first + .5);
                        unsigned semitone = (quantizedSemitone+nSemitones)%nSemitones;
                        if (_windowingActivated)
                                _output[semitone] += windowedValue(peaks[i].first,peaks[i].second);
                        else
                                _output[semitone] += peaks[i].second;
                }
        }

        const PCP & output() const
        {
                return _output;
        }
};

} // namespace Simac

#endif// CircularPeaksToPCP_hxx