/usr/include/CLAM/CircularPeakTunner.hxx is in libclam-dev 1.4.0-5.2.
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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 CircularPeakTunner_hxx
#define CircularPeakTunner_hxx
#include <list>
#include <vector>
#include <cmath>
namespace Simac
{
/**
* This processing takes an array of circular peaks with position
* at pitch units [0,12) and corrects them to be tunned given a
* tunning center and a reference tune.
* The tunning center is the detected tunning center within a single
* semitone [0,1).
* The reference tunning is the reference we take for pitch 0.
* @todo be more explicit on the meaning of reference tunning.
*/
class CircularPeakTunner
{
public:
typedef std::vector<std::pair<double, double> > PeakList;
typedef std::vector<std::pair<double, double> > PitchProfile;
private:
double _referenceTunning;
PeakList _output;
static const unsigned nSemitones = 12;
static const unsigned binsPerSemitone = 3;
public:
CircularPeakTunner(double referenceTunning)
: _referenceTunning(referenceTunning)
{
_output.reserve(nSemitones*binsPerSemitone);
}
~CircularPeakTunner()
{
}
/**
* @todo Migrate this function tests to one bin per semitone
* Given a tunning (in chromogram bins) and a peak position, it
* returns the semitone pitch index being the zero semitone the one
* containing the reference tunning.
* @param tunning is a [0,3) number that indicates the detected
* center of a semitone inside a chromogram semitone triplet.
**/
unsigned chromagramToSemitone(double tunning, double peakPosition)
{
double scaledPosition = peakPosition/binsPerSemitone;
double scaledTunning = tunning/binsPerSemitone;
double scaledReference = _referenceTunning/binsPerSemitone;
double shift = tunningShift(scaledReference, scaledTunning);
double tunnedPosition = tune(scaledPosition, shift);
int quantizedSemitone = int(tunnedPosition + .5);
unsigned refoldedSemitone = (quantizedSemitone+nSemitones)%nSemitones;
return refoldedSemitone;
}
static double tunningShift(double reference, double tunning)
{
return - tunning - std::floor(reference-tunning+0.5);
}
static double tune(double peakPosition, double shift)
{
double tunnedPosition = peakPosition + shift;
while (tunnedPosition<0) tunnedPosition += nSemitones;
while (tunnedPosition>= nSemitones) tunnedPosition -= nSemitones;
return tunnedPosition;
}
void doIt(double center, const PeakList & peaks)
{
_output.resize(0);
const unsigned nPeaks=peaks.size();
double shift= tunningShift(_referenceTunning, center);
for (unsigned i=0; i<nPeaks; i++)
{
double tunnedPosition = tune(peaks[i].first,shift);
_output.push_back(std::make_pair(tunnedPosition,peaks[i].second));
}
}
const PeakList & output() const
{
return _output;
}
};
} // namespace Simac
#endif// CircularPeakTunner_hxx
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