3 * Copyright 2005 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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8 * it under the terms of the GNU General Public License as published by
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
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19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
22 #ifndef INCLUDED_GR_FFT_FILTER_CCC_H
23 #define INCLUDED_GR_FFT_FILTER_CCC_H
25 #include <gr_sync_decimator.h>
27 class gr_fft_filter_ccc;
28 typedef boost::shared_ptr<gr_fft_filter_ccc> gr_fft_filter_ccc_sptr;
29 gr_fft_filter_ccc_sptr gr_make_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);
32 class gri_fft_complex;
35 * \brief Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps
38 class gr_fft_filter_ccc : public gr_sync_decimator
41 friend gr_fft_filter_ccc_sptr gr_make_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);
45 int d_fftsize; // fftsize = ntaps + nsamples - 1
46 gri_fft_complex *d_fwdfft; // forward "plan"
47 gri_fft_complex *d_invfft; // inverse "plan"
48 std::vector<gr_complex> d_tail; // state carried between blocks for overlap-add
49 std::vector<gr_complex> d_xformed_taps; // Fourier xformed taps
50 std::vector<gr_complex> d_new_taps;
54 * Construct a FFT filter with the given taps
56 * \param decimation >= 1
57 * \param taps complex filter taps
59 gr_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);
61 void compute_sizes(int ntaps);
62 int tailsize() const { return d_ntaps - 1; }
63 void actual_set_taps (const std::vector<gr_complex> &taps);
66 ~gr_fft_filter_ccc ();
68 void set_taps (const std::vector<gr_complex> &taps);
70 int work (int noutput_items,
71 gr_vector_const_void_star &input_items,
72 gr_vector_void_star &output_items);
77 #endif /* INCLUDED_GR_FFT_FILTER_CCC_H */