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/******************************************************************************
*
* Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* Contact: Nokia Corporation (qt-info@nokia.com)
*
* $QT_BEGIN_LICENSE:BSD$
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the author organization nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $QT_END_LICENSE$
*
*****************************************************************************/
#ifndef FASTFOURIERTRANSFORM_H
#define FASTFOURIERTRANSFORM_H
#include <QObject>
#include <QList>
class FastFourierTransformer : public QObject
{
Q_OBJECT
public:
FastFourierTransformer(QObject *parent = 0);
~FastFourierTransformer();
void reserve(int n);
void calculateFFT(QList<qint16> wave);
int getMaximumDensityIndex();
void setCutOffForDensity(float cutoff);
private:
float *m_waveFloat;
float *m_workingArray;
int *m_ifac;
int m_last_n;
float m_cutOffForDensitySquared;
};
#endif // FASTFOURIERTRANSFORM_H
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