FFTRealFixLen.h Example File
demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h
 
 
 #if ! defined (FFTRealFixLen_HEADER_INCLUDED)
 #define FFTRealFixLen_HEADER_INCLUDED
 #if defined (_MSC_VER)
         #pragma once
         #pragma warning (4 : 4250) // "Inherits via dominance."
 #endif
 
 #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:
    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:
 
 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;
 
 private:
                                                 FFTRealFixLen (const FFTRealFixLen &other);
         FFTRealFixLen&  operator = (const FFTRealFixLen &other);
         bool                            operator == (const FFTRealFixLen &other);
         bool                            operator != (const FFTRealFixLen &other);
 };      
 #include        "FFTRealFixLen.hpp"
 #endif  // FFTRealFixLen_HEADER_INCLUDED