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