FFTRealFixLen.h Example File

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

         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 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/