gr_fft_filter_ccc.h

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/* -*- c++ -*- */
/*
 * Copyright 2005 Free Software Foundation, Inc.
 * 
 * This file is part of GNU Radio
 * 
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#ifndef INCLUDED_GR_FFT_FILTER_CCC_H
#define INCLUDED_GR_FFT_FILTER_CCC_H

#include <gr_sync_decimator.h>

class gr_fft_filter_ccc;
typedef boost::shared_ptr<gr_fft_filter_ccc> gr_fft_filter_ccc_sptr;
gr_fft_filter_ccc_sptr gr_make_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);

class gr_fir_ccc;
class gri_fft_complex;

class gr_fft_filter_ccc : public gr_sync_decimator
{
 private:
  friend gr_fft_filter_ccc_sptr gr_make_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);

  int                      d_ntaps;
  int                      d_nsamples;
  int                      d_fftsize;           // fftsize = ntaps + nsamples - 1
  gri_fft_complex         *d_fwdfft;            // forward "plan"
  gri_fft_complex         *d_invfft;            // inverse "plan"
  std::vector<gr_complex>  d_tail;              // state carried between blocks for overlap-add
  std::vector<gr_complex>  d_xformed_taps;      // Fourier xformed taps
  std::vector<gr_complex>  d_new_taps;
  bool                     d_updated;

  gr_fft_filter_ccc (int decimation, const std::vector<gr_complex> &taps);

  void compute_sizes(int ntaps);
  int tailsize() const { return d_ntaps - 1; }
  void actual_set_taps (const std::vector<gr_complex> &taps);

 public:
  ~gr_fft_filter_ccc ();

  void set_taps (const std::vector<gr_complex> &taps);

  int work (int noutput_items,
            gr_vector_const_void_star &input_items,
            gr_vector_void_star &output_items);
};



#endif /* INCLUDED_GR_FFT_FILTER_CCC_H */

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