FFTRealFixLen.h Example File | Qt Multimedia 5.9

Qt 5.9 | Qt Multimedia | Spectrum Example | FFTRealFixLen.h Example File

Qt 5.9.2 Reference Documentation

# FFTRealFixLen.h Example File

multimedia/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 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/