diff options
Diffstat (limited to 'demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h')
-rw-r--r-- | demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h b/demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h new file mode 100644 index 0000000..0b80266 --- /dev/null +++ b/demos/spectrum/3rdparty/fftreal/FFTRealFixLen.h @@ -0,0 +1,130 @@ +/***************************************************************************** + + 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 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |