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# FFTRealFixLen.h Example File

demos/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 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/