- Qt 5.5
- Qt Multimedia
- Spectrum Example
- fftreal_wrapper.h Example File
- Qt 5.5.1 Reference Documentation

# fftreal_wrapper.h Example File

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