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# fftreal_wrapper.h Example File

demos/spectrum/3rdparty/fftreal/fftreal_wrapper.h

     /***************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** This program is free software: you can redistribute it and/or modify
     ** it under the terms of the GNU Lesser General Public License as
     ** published by the Free Software Foundation, either version 2.1. This
     ** program 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 should have received a copy of the GNU General
     ** Public License along with this program. If not, see
     ** <http://www.gnu.org/licenses/>.
     **
     ***************************************************************************/

     #ifndef FFTREAL_WRAPPER_H
     #define FFTREAL_WRAPPER_H

     #include <QtCore/QtGlobal>

     #if defined(FFTREAL_LIBRARY)
     #  define FFTREAL_EXPORT Q_DECL_EXPORT
     #else
     #  define FFTREAL_EXPORT Q_DECL_IMPORT
     #endif

     class FFTRealWrapperPrivate;

     // Each pass of the FFT processes 2^X samples, where X is the
     // number below.
     static const int FFTLengthPowerOfTwo = 12;

     /**
      * Wrapper around the FFTRealFixLen template provided by the FFTReal
      * library
      *
      * This class instantiates a single instance of FFTRealFixLen, using
      * FFTLengthPowerOfTwo as the template parameter.  It then exposes
      * FFTRealFixLen<FFTLengthPowerOfTwo>::do_fft via the calculateFFT
      * function, thereby allowing an application to dynamically link
      * against the FFTReal implementation.
      *
      * See http://ldesoras.free.fr/prod.html
      */
     class FFTREAL_EXPORT FFTRealWrapper
     {
     public:
         FFTRealWrapper();
         ~FFTRealWrapper();

         typedef float DataType;
         void calculateFFT(DataType in[], const DataType out[]);

     private:
         FFTRealWrapperPrivate*  m_private;
     };

     #endif // FFTREAL_WRAPPER_H