GNU Radio 3.4.0 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2010 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_GRI_FFT_FILTER_FFF_SSE_H 00024 #define INCLUDED_GRI_FFT_FILTER_FFF_SSE_H 00025 00026 #include <gr_complex.h> 00027 #include <vector> 00028 00029 class gri_fft_real_fwd; 00030 class gri_fft_real_rev; 00031 00032 class gri_fft_filter_fff_sse 00033 { 00034 private: 00035 int d_ntaps; 00036 int d_nsamples; 00037 int d_fftsize; // fftsize = ntaps + nsamples - 1 00038 int d_decimation; 00039 gri_fft_real_fwd *d_fwdfft; // forward "plan" 00040 gri_fft_real_rev *d_invfft; // inverse "plan" 00041 std::vector<float> d_tail; // state carried between blocks for overlap-add 00042 //std::vector<gr_complex> d_xformed_taps; // Fourier xformed taps 00043 gr_complex *d_xformed_taps; 00044 std::vector<float> d_new_taps; 00045 00046 00047 void compute_sizes(int ntaps); 00048 int tailsize() const { return d_ntaps - 1; } 00049 00050 public: 00051 /*! 00052 * \brief Construct a FFT filter for float vectors with the given taps and decimation rate. 00053 * 00054 * This is the basic implementation for performing FFT filter for fast convolution 00055 * in other blocks for floating point vectors (such as gr_fft_filter_fff). 00056 * \param decimation The decimation rate of the filter (int) 00057 * \param taps The filter taps (float) 00058 */ 00059 gri_fft_filter_fff_sse (int decimation, const std::vector<float> &taps); 00060 ~gri_fft_filter_fff_sse (); 00061 00062 /*! 00063 * \brief Set new taps for the filter. 00064 * 00065 * Sets new taps and resets the class properties to handle different sizes 00066 * \param taps The filter taps (float) 00067 */ 00068 int set_taps (const std::vector<float> &taps); 00069 00070 /*! 00071 * \brief Perform the filter operation 00072 * 00073 * \param nitems The number of items to produce 00074 * \param input The input vector to be filtered 00075 * \param output The result of the filter operation 00076 */ 00077 int filter (int nitems, const float *input, float *output); 00078 00079 }; 00080 00081 #endif /* INCLUDED_GRI_FFT_FILTER_FFF_SSE_H */