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