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Diffstat (limited to 'tests/manual/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp')
| -rw-r--r-- | tests/manual/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp | 322 |
1 files changed, 0 insertions, 322 deletions
diff --git a/tests/manual/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp b/tests/manual/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp deleted file mode 100644 index 6defb009..00000000 --- a/tests/manual/spectrum/3rdparty/fftreal/FFTRealFixLen.hpp +++ /dev/null @@ -1,322 +0,0 @@ -/***************************************************************************** - - FFTRealFixLen.hpp - 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_CURRENT_CODEHEADER) - #error Recursive inclusion of FFTRealFixLen code header. -#endif -#define FFTRealFixLen_CURRENT_CODEHEADER - -#if ! defined (FFTRealFixLen_CODEHEADER_INCLUDED) -#define FFTRealFixLen_CODEHEADER_INCLUDED - - - -/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ - -#include "def.h" -#include "FFTRealPassDirect.h" -#include "FFTRealPassInverse.h" -#include "FFTRealSelect.h" - -#include <cassert> -#include <cmath> - -namespace std { } - - - -/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ - - - -template <int LL2> -FFTRealFixLen <LL2>::FFTRealFixLen () -: _buffer (FFT_LEN) -, _br_data (BR_ARR_SIZE) -, _trigo_data (TRIGO_TABLE_ARR_SIZE) -, _trigo_osc () -{ - build_br_lut (); - build_trigo_lut (); - build_trigo_osc (); -} - - - -template <int LL2> -long FFTRealFixLen <LL2>::get_length () const -{ - return (FFT_LEN); -} - - - -// General case -template <int LL2> -void FFTRealFixLen <LL2>::do_fft (DataType f [], const DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - assert (FFT_LEN_L2 >= 3); - - // Do the transform in several passes - const DataType * cos_ptr = &_trigo_data [0]; - const long * br_ptr = &_br_data [0]; - - FFTRealPassDirect <FFT_LEN_L2 - 1>::process ( - FFT_LEN, - f, - &_buffer [0], - x, - cos_ptr, - TRIGO_TABLE_ARR_SIZE, - br_ptr, - &_trigo_osc [0] - ); -} - -// 4-point FFT -template <> -void FFTRealFixLen <2>::do_fft (DataType f [], const DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - - f [1] = x [0] - x [2]; - f [3] = x [1] - x [3]; - - const DataType b_0 = x [0] + x [2]; - const DataType b_2 = x [1] + x [3]; - - f [0] = b_0 + b_2; - f [2] = b_0 - b_2; -} - -// 2-point FFT -template <> -void FFTRealFixLen <1>::do_fft (DataType f [], const DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - - f [0] = x [0] + x [1]; - f [1] = x [0] - x [1]; -} - -// 1-point FFT -template <> -void FFTRealFixLen <0>::do_fft (DataType f [], const DataType x []) -{ - assert (f != 0); - assert (x != 0); - - f [0] = x [0]; -} - - - -// General case -template <int LL2> -void FFTRealFixLen <LL2>::do_ifft (const DataType f [], DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - assert (FFT_LEN_L2 >= 3); - - // Do the transform in several passes - DataType * s_ptr = - FFTRealSelect <FFT_LEN_L2 & 1>::sel_bin (&_buffer [0], x); - DataType * d_ptr = - FFTRealSelect <FFT_LEN_L2 & 1>::sel_bin (x, &_buffer [0]); - const DataType * cos_ptr = &_trigo_data [0]; - const long * br_ptr = &_br_data [0]; - - FFTRealPassInverse <FFT_LEN_L2 - 1>::process ( - FFT_LEN, - d_ptr, - s_ptr, - f, - cos_ptr, - TRIGO_TABLE_ARR_SIZE, - br_ptr, - &_trigo_osc [0] - ); -} - -// 4-point IFFT -template <> -void FFTRealFixLen <2>::do_ifft (const DataType f [], DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - - const DataType b_0 = f [0] + f [2]; - const DataType b_2 = f [0] - f [2]; - - x [0] = b_0 + f [1] * 2; - x [2] = b_0 - f [1] * 2; - x [1] = b_2 + f [3] * 2; - x [3] = b_2 - f [3] * 2; -} - -// 2-point IFFT -template <> -void FFTRealFixLen <1>::do_ifft (const DataType f [], DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - - x [0] = f [0] + f [1]; - x [1] = f [0] - f [1]; -} - -// 1-point IFFT -template <> -void FFTRealFixLen <0>::do_ifft (const DataType f [], DataType x []) -{ - assert (f != 0); - assert (x != 0); - assert (x != f); - - x [0] = f [0]; -} - - - - -template <int LL2> -void FFTRealFixLen <LL2>::rescale (DataType x []) const -{ - assert (x != 0); - - const DataType mul = DataType (1.0 / FFT_LEN); - - if (FFT_LEN < 4) - { - long i = FFT_LEN - 1; - do - { - x [i] *= mul; - --i; - } - while (i >= 0); - } - - else - { - assert ((FFT_LEN & 3) == 0); - - // Could be optimized with SIMD instruction sets (needs alignment check) - long i = FFT_LEN - 4; - do - { - x [i + 0] *= mul; - x [i + 1] *= mul; - x [i + 2] *= mul; - x [i + 3] *= mul; - i -= 4; - } - while (i >= 0); - } -} - - - -/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ - - - -/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ - - - -template <int LL2> -void FFTRealFixLen <LL2>::build_br_lut () -{ - _br_data [0] = 0; - for (long cnt = 1; cnt < BR_ARR_SIZE; ++cnt) - { - long index = cnt << 2; - long br_index = 0; - - int bit_cnt = FFT_LEN_L2; - do - { - br_index <<= 1; - br_index += (index & 1); - index >>= 1; - - -- bit_cnt; - } - while (bit_cnt > 0); - - _br_data [cnt] = br_index; - } -} - - - -template <int LL2> -void FFTRealFixLen <LL2>::build_trigo_lut () -{ - const double mul = (0.5 * PI) / TRIGO_TABLE_ARR_SIZE; - for (long i = 0; i < TRIGO_TABLE_ARR_SIZE; ++ i) - { - using namespace std; - - _trigo_data [i] = DataType (cos (i * mul)); - } -} - - - -template <int LL2> -void FFTRealFixLen <LL2>::build_trigo_osc () -{ - for (int i = 0; i < NBR_TRIGO_OSC; ++i) - { - OscType & osc = _trigo_osc [i]; - - const long len = static_cast <long> (TRIGO_TABLE_ARR_SIZE) << (i + 1); - const double mul = (0.5 * PI) / len; - osc.set_step (mul); - } -} - - - -#endif // FFTRealFixLen_CODEHEADER_INCLUDED - -#undef FFTRealFixLen_CURRENT_CODEHEADER - - - -/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/ |