3 * Copyright 2004,2008 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
23 #ifndef INCLUDED_GR_SYNC_INTERPOLATOR_H
24 #define INCLUDED_GR_SYNC_INTERPOLATOR_H
26 #include <gr_sync_block.h>
29 * \brief synchronous 1:N input to output with history
32 * Override work to provide the signal processing implementation.
34 class gr_sync_interpolator : public gr_sync_block
37 unsigned d_interpolation;
40 gr_sync_interpolator (const std::string &name,
41 gr_io_signature_sptr input_signature,
42 gr_io_signature_sptr output_signature,
43 unsigned interpolation);
46 unsigned interpolation () const { return d_interpolation; }
47 void set_interpolation (unsigned interpolation)
49 d_interpolation = interpolation;
50 set_relative_rate (1.0 * interpolation);
51 set_output_multiple (interpolation);
54 // gr_sync_interpolator overrides these to assist work
55 void forecast (int noutput_items, gr_vector_int &ninput_items_required);
56 int general_work (int noutput_items,
57 gr_vector_int &ninput_items,
58 gr_vector_const_void_star &input_items,
59 gr_vector_void_star &output_items);
61 // derived classes should override work
63 int fixed_rate_ninput_to_noutput(int ninput);
64 int fixed_rate_noutput_to_ninput(int noutput);
68 #endif /* INCLUDED_GR_SYNC_INTERPOLATOR_H */