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23 #ifndef INCLUDED_GRI_FFT_FILTER_CCC_GENERIC_H
24 #define INCLUDED_GRI_FFT_FILTER_CCC_GENERIC_H
26 #include <gr_complex.h>
29 class gri_fft_complex;
32 * \brief Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps
35 class gri_fft_filter_ccc_generic
40 int d_fftsize; // fftsize = ntaps + nsamples - 1
42 gri_fft_complex *d_fwdfft; // forward "plan"
43 gri_fft_complex *d_invfft; // inverse "plan"
44 std::vector<gr_complex> d_tail; // state carried between blocks for overlap-add
45 std::vector<gr_complex> d_xformed_taps; // Fourier xformed taps
46 std::vector<gr_complex> d_new_taps;
48 void compute_sizes(int ntaps);
49 int tailsize() const { return d_ntaps - 1; }
53 * \brief Construct an FFT filter for complex vectors with the given taps and decimation rate.
55 * This is the basic implementation for performing FFT filter for fast convolution
56 * in other blocks for complex vectors (such as gr_fft_filter_ccc).
57 * \param decimation The decimation rate of the filter (int)
58 * \param taps The filter taps (complex)
60 gri_fft_filter_ccc_generic (int decimation, const std::vector<gr_complex> &taps);
61 ~gri_fft_filter_ccc_generic ();
64 * \brief Set new taps for the filter.
66 * Sets new taps and resets the class properties to handle different sizes
67 * \param taps The filter taps (complex)
69 int set_taps (const std::vector<gr_complex> &taps);
72 * \brief Perform the filter operation
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
78 int filter (int nitems, const gr_complex *input, gr_complex *output);
82 #endif /* INCLUDED_GRI_FFT_FILTER_CCC_GENERIC_H */