71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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Rubber Band
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An audio time-stretching and pitch-shifting library.
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Copyright 2007 Chris Cannam.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#ifndef _RUBBERBAND_FFT_H_
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#define _RUBBERBAND_FFT_H_
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class FFTImpl;
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/**
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* Provide the basic FFT computations we need, using one of a set of
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* candidate FFT implementations (depending on compile flags).
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*
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* Implements real->complex FFTs of power-of-two sizes only. Note
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* that only the first half of the output signal is returned (the
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* complex conjugates half is omitted), so the "complex" arrays need
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* room for size/2+1 elements.
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*
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* Not thread safe: use a separate instance per thread.
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*/
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class FFT
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{
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public:
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enum Exception { InvalidSize };
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FFT(unsigned int size); // may throw InvalidSize
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~FFT();
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void forward(double *realIn, double *realOut, double *imagOut);
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void forwardPolar(double *realIn, double *magOut, double *phaseOut);
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void forwardMagnitude(double *realIn, double *magOut);
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void forward(float *realIn, float *realOut, float *imagOut);
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void forwardPolar(float *realIn, float *magOut, float *phaseOut);
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void forwardMagnitude(float *realIn, float *magOut);
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void inverse(double *realIn, double *imagIn, double *realOut);
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void inversePolar(double *magIn, double *phaseIn, double *realOut);
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void inverse(float *realIn, float *imagIn, float *realOut);
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void inversePolar(float *magIn, float *phaseIn, float *realOut);
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// Calling one or both of these is optional -- if neither is
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// called, the first call to a forward or inverse method will call
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// init(). You only need call these if you don't want to risk
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// expensive allocations etc happening in forward or inverse.
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void initFloat();
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void initDouble();
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static void tune();
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protected:
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FFTImpl *d;
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static int m_method;
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};
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#endif
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