gr_fft_filter_fff.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2005 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 #ifndef INCLUDED_GR_FFT_FILTER_FFF_H
00023 #define INCLUDED_GR_FFT_FILTER_FFF_H
00024 
00025 #include <gr_sync_decimator.h>
00026 
00027 class gr_fft_filter_fff;
00028 typedef boost::shared_ptr<gr_fft_filter_fff> gr_fft_filter_fff_sptr;
00029 gr_fft_filter_fff_sptr gr_make_fft_filter_fff (int decimation, const std::vector<float> &taps);
00030 
00031 class gr_fir_fff;
00032 class gri_fft_real_fwd;
00033 class gri_fft_real_rev;
00034 
00039 class gr_fft_filter_fff : public gr_sync_decimator
00040 {
00041  private:
00042   friend gr_fft_filter_fff_sptr gr_make_fft_filter_fff (int decimation, const std::vector<float> &taps);
00043 
00044   int                      d_ntaps;
00045   int                      d_nsamples;
00046   int                      d_fftsize;           // fftsize = ntaps + nsamples - 1
00047   gri_fft_real_fwd        *d_fwdfft;            // forward "plan"
00048   gri_fft_real_rev        *d_invfft;            // inverse "plan"
00049   std::vector<float>       d_tail;              // state carried between blocks for overlap-add
00050   std::vector<gr_complex>  d_xformed_taps;      // Fourier xformed taps
00051 
00058   gr_fft_filter_fff (int decimation, const std::vector<float> &taps);
00059 
00060   void compute_sizes(int ntaps);
00061   int tailsize() const { return d_ntaps - 1; }
00062   
00063  public:
00064   ~gr_fft_filter_fff ();
00065 
00066   void set_taps (const std::vector<float> &taps);
00067 
00068   int work (int noutput_items,
00069             gr_vector_const_void_star &input_items,
00070             gr_vector_void_star &output_items);
00071 };
00072 
00073 #endif /* INCLUDED_GR_FFT_FILTER_FFF_H */

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