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-/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
-
-/*
- Rubber Band
- An audio time-stretching and pitch-shifting library.
- Copyright 2007-2008 Chris Cannam.
-
- 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. See the file
- COPYING included with this distribution for more information.
-*/
-
-#ifndef _RUBBERBAND_FFT_H_
-#define _RUBBERBAND_FFT_H_
-
-#include "sysutils.h"
-
-namespace RubberBand {
-
-class FFTImpl;
-
-/**
- * Provide the basic FFT computations we need, using one of a set of
- * candidate FFT implementations (depending on compile flags).
- *
- * Implements real->complex FFTs of power-of-two sizes only. Note
- * that only the first half of the output signal is returned (the
- * complex conjugates half is omitted), so the "complex" arrays need
- * room for size/2+1 elements.
- *
- * Not thread safe: use a separate instance per thread.
- */
-
-class FFT
-{
-public:
- enum Exception { InvalidSize };
-
- FFT(int size, int debugLevel = 0); // may throw InvalidSize
- ~FFT();
-
- void forward(const double *R__ realIn, double *R__ realOut, double *R__ imagOut);
- void forwardPolar(const double *R__ realIn, double *R__ magOut, double *R__ phaseOut);
- void forwardMagnitude(const double *R__ realIn, double *R__ magOut);
-
- void forward(const float *R__ realIn, float *R__ realOut, float *R__ imagOut);
- void forwardPolar(const float *R__ realIn, float *R__ magOut, float *R__ phaseOut);
- void forwardMagnitude(const float *R__ realIn, float *R__ magOut);
-
- void inverse(const double *R__ realIn, const double *R__ imagIn, double *R__ realOut);
- void inversePolar(const double *R__ magIn, const double *R__ phaseIn, double *R__ realOut);
- void inverseCepstral(const double *R__ magIn, double *R__ cepOut);
-
- void inverse(const float *R__ realIn, const float *R__ imagIn, float *R__ realOut);
- void inversePolar(const float *R__ magIn, const float *R__ phaseIn, float *R__ realOut);
- void inverseCepstral(const float *R__ magIn, float *R__ cepOut);
-
- // Calling one or both of these is optional -- if neither is
- // called, the first call to a forward or inverse method will call
- // init(). You only need call these if you don't want to risk
- // expensive allocations etc happening in forward or inverse.
- void initFloat();
- void initDouble();
-
- float *getFloatTimeBuffer();
- double *getDoubleTimeBuffer();
-
- static void tune();
-
-protected:
- FFTImpl *d;
- static int m_method;
-};
-
-}
-
-#endif
-