GNU Radio 3.6.1 C++ API
gri_fft_filter_fff_sse.h
Go to the documentation of this file.
1 /* -*- c++ -*- */
2 /*
3  * Copyright 2010 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef INCLUDED_GRI_FFT_FILTER_FFF_SSE_H
24 #define INCLUDED_GRI_FFT_FILTER_FFF_SSE_H
25 
26 #include <gr_core_api.h>
27 #include <gr_complex.h>
28 #include <vector>
29 
30 class gri_fft_real_fwd;
31 class gri_fft_real_rev;
32 
34 {
35  private:
36  int d_ntaps;
37  int d_nsamples;
38  int d_fftsize; // fftsize = ntaps + nsamples - 1
39  int d_decimation;
40  gri_fft_real_fwd *d_fwdfft; // forward "plan"
41  gri_fft_real_rev *d_invfft; // inverse "plan"
42  std::vector<float> d_tail; // state carried between blocks for overlap-add
43  //std::vector<gr_complex> d_xformed_taps; // Fourier xformed taps
44  gr_complex *d_xformed_taps;
45  std::vector<float> d_new_taps;
46 
47 
48  void compute_sizes(int ntaps);
49  int tailsize() const { return d_ntaps - 1; }
50 
51  public:
52  /*!
53  * \brief Construct a FFT filter for float vectors with the given taps and decimation rate.
54  *
55  * This is the basic implementation for performing FFT filter for fast convolution
56  * in other blocks for floating point vectors (such as gr_fft_filter_fff).
57  * \param decimation The decimation rate of the filter (int)
58  * \param taps The filter taps (float)
59  */
60  gri_fft_filter_fff_sse (int decimation, const std::vector<float> &taps);
62 
63  /*!
64  * \brief Set new taps for the filter.
65  *
66  * Sets new taps and resets the class properties to handle different sizes
67  * \param taps The filter taps (float)
68  */
69  int set_taps (const std::vector<float> &taps);
70 
71  /*!
72  * \brief Perform the filter operation
73  *
74  * \param nitems The number of items to produce
75  * \param input The input vector to be filtered
76  * \param output The result of the filter operation
77  */
78  int filter (int nitems, const float *input, float *output);
79 
80 };
81 
82 #endif /* INCLUDED_GRI_FFT_FILTER_FFF_SSE_H */