GNU Radio 3.6.4 C++ API
gri_fft_filter_ccc_sse.h
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1 /* -*- c++ -*- */
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3  * Copyright 2010 Free Software Foundation, Inc.
4  *
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22 
23 #ifndef INCLUDED_GRI_FFT_FILTER_CCC_SSE_H
24 #define INCLUDED_GRI_FFT_FILTER_CCC_SSE_H
25 
26 #include <gr_core_api.h>
27 #include <gr_complex.h>
28 #include <vector>
29 
30 class gri_fft_complex;
31 
32 /*!
33  * \brief Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps
34  * \ingroup filter_blk
35  */
37 {
38  private:
39  int d_ntaps;
40  int d_nsamples;
41  int d_fftsize; // fftsize = ntaps + nsamples - 1
42  int d_decimation;
43  gri_fft_complex *d_fwdfft; // forward "plan"
44  gri_fft_complex *d_invfft; // inverse "plan"
45  std::vector<gr_complex> d_tail; // state carried between blocks for overlap-add
46  gr_complex *d_xformed_taps;
47  std::vector<gr_complex> d_new_taps;
48 
49  void compute_sizes(int ntaps);
50  int tailsize() const { return d_ntaps - 1; }
51 
52  public:
53  /*!
54  * \brief Construct an FFT filter for complex vectors with the given taps and decimation rate.
55  *
56  * This is the basic implementation for performing FFT filter for fast convolution
57  * in other blocks for complex vectors (such as gr_fft_filter_ccc).
58  * \param decimation The decimation rate of the filter (int)
59  * \param taps The filter taps (complex)
60  */
61  gri_fft_filter_ccc_sse (int decimation, const std::vector<gr_complex> &taps);
63 
64  /*!
65  * \brief Set new taps for the filter.
66  *
67  * Sets new taps and resets the class properties to handle different sizes
68  * \param taps The filter taps (complex)
69  */
70  int set_taps (const std::vector<gr_complex> &taps);
71 
72  /*!
73  * \brief Perform the filter operation
74  *
75  * \param nitems The number of items to produce
76  * \param input The input vector to be filtered
77  * \param output The result of the filter operation
78  */
79  int filter (int nitems, const gr_complex *input, gr_complex *output);
80 
81 };
82 
83 #endif /* INCLUDED_GRI_FFT_FILTER_CCC_SSE_H */