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# realFFT.H

    00001 /* Copyright 2001,2002 Matt Flax <flatmax@ieee.org>
    00002    This file is part of the MFFM FFTw Wrapper library.
    00003
    00004    MFFM MFFM FFTw Wrapper library is free software; you can
    00005    redistribute it and/or modify
    00006    it under the terms of the GNU General Public License as published by
    00007    the Free Software Foundation; either version 2 of the License, or
    00008    (at your option) any later version.
    00009
    00010    MFFM FFTw Wrapper library is distributed in the hope that it will be useful,
    00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013    GNU General Public License for more details.
    00014
    00015    You have received a copy of the GNU General Public License
    00016    along with the MFFM FFTw Wrapper library
    00017 */
    00018 #ifndef REALFFT_H_
    00019 #define REALFFT_H_
    00020
    00021 #include "realFFTData.H"
    00022 #include <fftw3.h>
    00023
    00024 #include <iostream>
    00025 using namespace std;
    00026
    00027 class realFFTData;
    00028
    00029 #define PLANTYPE FFTW_ESTIMATE
    00030
    00031 ///class realFFT controls fftw plans and executes fwd/inv transforms
    00032 class realFFT {
    00033   /// The fwd/inv plans
    00034   fftw_plan fwdPlan, invPlan;
    00035
    00036   /// Method to create the plans
    00037   void createPlan(void);
    00038   /// Method to destroy the plans
    00039   void destroyPlan(void);
    00040 protected:
    00041   /// The pointer to the relevant data
    00042   realFFTData *data;
    00043 public:
    00044   /// fft init ... don't forget to associate data using switchData
    00045   realFFT(void);
    00046   /// fft init ... data pointed to by 'd'
    00047   realFFT(realFFTData *d);
    00048   /// fft deconstructor
    00049   ~realFFT(void);
    00050
    00051   /// Use this to change associated fft data (for fft'ing)
    00052   void switchData(realFFTData *d);
    00053
    00054   /// Forward transform the data (in to out)
    00055   void fwdTransform(); // Forward fft
    00056   /// Inverse transform the data (out to in)
    00057   void invTransform(); // Inverse fft
    00058 };
    00059 /** \example realFFTExample.cc
    00060  * This is an example of how to use the class.
    00061  * It transforms a sine tone stored in the .dat file and saves the
    00062  * in, out, and power_spectrum results of using the class
    00063  */
    00064 #endif // REALFFT_H_