/usr/include/mffm/complexFFT.H is in mffm-fftw-dev 1.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /* Copyright 2001,2002 Matt Flax <flatmax@ieee.org>
This file is part of the MFFM FFTw Wrapper library.
MFFM MFFM FFTw Wrapper library 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.
MFFM FFTw Wrapper library 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 have received a copy of the GNU General Public License
along with the MFFM FFTw Wrapper library
*/
#ifndef COMPLEXFFT_H_
#define COMPLEXFFT_H_
#include <fftw3.h>
#ifndef fftw_real
#define fftw_real double
#endif
#define c_re(c) ((c)[0])
#define c_im(c) ((c)[1])
#include <iomanip>
using namespace std;
#define PLANTYPE FFTW_ESTIMATE
/// class complexFFTData controls and manipulates complex fft data
class complexFFTData {
public:
/// Specifies the size of the data array
int size;
/// the input and output arrays
fftw_complex *in, *out;
/// the power_spectrum array
fftw_real *power_spectrum;
/// The total power (summed) of the power spectrum as used in the method compPowerSpec
double totalPower;
/// Constructor with all memory to be allocated internally
complexFFTData(int sz);
/// Deconstructor
~complexFFTData(void);
/// Use this to change associated fft data (for fft'ing)
void switchData(complexFFTData *d);
/// Limits the maximum to 'lim' and returns the last fft bin with max
int limitHalfPowerSpec(double lim);
/// Returns the number of elements in the input and output arrays
int getSize(){return size;}
// int getHalfSize(){ if (!(size%2)) return size/2; else return size/2+1;}
/// This function computes the power spectrum and returns the max bin
int compPowerSpec();
// int powerSpecDeriv(); // Find the derivative of the power spectrum
};
///class complexFFT controls fftw plans and executes fwd/inv transforms
class complexFFT {
/// The fwd/inv plans
fftw_plan fwdPlan, invPlan;
/// Method to create the plans
void createPlan(void);
/// Method to destroy the plans
void destroyPlan(void);
protected:
// int size;
/// The pointer to the relevant data
complexFFTData *data;
public:
// complexFFT(int sz, char *ws=NULL);
/// fft init ... data pointed to by 'd'
complexFFT(complexFFTData *d);
/// fft deconstructor
~complexFFT();
/// Use this to change associated fft data (for fft'ing)
void switchData(complexFFTData *d);
/// Forward transform the data (in to out)
void fwdTransform(); // Forward fft
/// Inverse transform the data (out to in)
void invTransform(); // Inverse fft
};
/** \example complexFFTExample.cc
* This is an example of how to use the class.
*/
#endif // COMPLEXFFT_H_
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