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

# FFTRealFixLen.h Example File

spectrum/3rdparty/fftreal/FFTRealFixLen.h

    /*****************************************************************************

            FFTRealFixLen.h
            Copyright (c) 2005 Laurent de Soras

    --- Legal stuff ---

    This library 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 of the License, or (at your option) any later version.

    This 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    *Tab=3***********************************************************************/

    #if ! defined (FFTRealFixLen_HEADER_INCLUDED)
    #define FFTRealFixLen_HEADER_INCLUDED

    #if defined (_MSC_VER)
            #pragma once
            #pragma warning (4 : 4250) // "Inherits via dominance."
    #endif

    /*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

    #include        "Array.h"
    #include        "DynArray.h"
    #include        "FFTRealFixLenParam.h"
    #include        "OscSinCos.h"

    template <int LL2>
    class FFTRealFixLen
    {
            typedef int     CompileTimeCheck1 [(LL2 >=  0) ? 1 : -1];
            typedef int     CompileTimeCheck2 [(LL2 <= 30) ? 1 : -1];

    /*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

    public:

       typedef      FFTRealFixLenParam::DataType   DataType;
            typedef OscSinCos <DataType>    OscType;

            enum {                  FFT_LEN_L2      = LL2   };
            enum {                  FFT_LEN         = 1 << FFT_LEN_L2       };

                                                    FFTRealFixLen ();

            inline long             get_length () const;
            void                            do_fft (DataType f [], const DataType x []);
            void                            do_ifft (const DataType f [], DataType x []);
            void                            rescale (DataType x []) const;

    /*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

    protected:

    /*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

    private:

            enum {                  TRIGO_BD_LIMIT  = FFTRealFixLenParam::TRIGO_BD_LIMIT    };

            enum {                  BR_ARR_SIZE_L2  = ((FFT_LEN_L2 - 3) < 0) ? 0 : (FFT_LEN_L2 - 2) };
            enum {                  BR_ARR_SIZE             = 1 << BR_ARR_SIZE_L2   };

       enum {                       TRIGO_BD                        =   ((FFT_LEN_L2 - TRIGO_BD_LIMIT) < 0)
                                                                                              ? (int)FFT_LEN_L2
                                                                                              : (int)TRIGO_BD_LIMIT };
            enum {                  TRIGO_TABLE_ARR_SIZE_L2 = (LL2 < 4) ? 0 : (TRIGO_BD - 2)        };
            enum {                  TRIGO_TABLE_ARR_SIZE    = 1 << TRIGO_TABLE_ARR_SIZE_L2  };

            enum {                  NBR_TRIGO_OSC                   = FFT_LEN_L2 - TRIGO_BD };
            enum {                  TRIGO_OSC_ARR_SIZE      =       (NBR_TRIGO_OSC > 0) ? NBR_TRIGO_OSC : 1 };

            void                            build_br_lut ();
            void                            build_trigo_lut ();
            void                            build_trigo_osc ();

            DynArray <DataType>
                                                    _buffer;
            DynArray <long>
                                                    _br_data;
            DynArray <DataType>
                                                    _trigo_data;
       Array <OscType, TRIGO_OSC_ARR_SIZE>
                                                    _trigo_osc;

    /*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/

    private:

                                                    FFTRealFixLen (const FFTRealFixLen &other);
            FFTRealFixLen&  operator = (const FFTRealFixLen &other);
            bool                            operator == (const FFTRealFixLen &other);
            bool                            operator != (const FFTRealFixLen &other);

    };      // class FFTRealFixLen

    #include        "FFTRealFixLen.hpp"

    #endif  // FFTRealFixLen_HEADER_INCLUDED

    /*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/