InstantTunningEstimator.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 InstantTunningEstimator_hxx
#define InstantTunningEstimator_hxx
#include <list>
#include <vector>
#include <cmath>

namespace Simac
{

class InstantTunningEstimator
{
public:
        typedef std::vector<std::pair<double, double> > PeakList;
private:
        double _fasorX;
        double _fasorY;
        double _instantX;
        double _instantY;
        double _inertia;
public:
        InstantTunningEstimator(double inertia=0.0)
                : _inertia(inertia)
        {
                _fasorX=1.0;
                _fasorY=0.0;
        }
        ~InstantTunningEstimator()
        {
        }
        void setInertia(double inertia)
        {
                _inertia=inertia;
        }
        // TODO: This function is taken by S&R of the previous one, no test!!
        void doIt(const std::vector<std::pair<double, double> >& peaks)
        {
                _fasorX*=_inertia;
                _fasorY*=_inertia;
                _instantX=0;
                _instantY=0;
                for (unsigned int peak=0; peak<peaks.size(); peak++)
                {
                        double radiantTunning=peaks[peak].first*2*M_PI;
                        _instantX+=cos(radiantTunning)*peaks[peak].second;
                        _instantY+=sin(radiantTunning)*peaks[peak].second;
                }
                _fasorX += _instantX;
                _fasorY += _instantY;
        }
        std::pair<double,double> output() const
        {
                double tunning=std::atan2(_fasorY,_fasorX)/2/M_PI;
                double strength=std::sqrt(_fasorY*_fasorY+_fasorX*_fasorX);
                return std::make_pair(tunning, strength);
        }
        std::pair<double,double> instantTunning() const
        {
                double tunning=std::atan2(_instantY,_instantX)/2/M_PI;
                double strength=std::sqrt(_instantY*_instantY+_instantX*_instantX);
                return std::make_pair(tunning, strength);
        }
};

} // namespace Simac

#endif// InstantTunningEstimator_hxx