3 * Copyright 2007 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_DELAY_H
24 #define INCLUDED_GR_DELAY_H
26 #include <gr_sync_block.h>
29 typedef boost::shared_ptr<gr_delay> gr_delay_sptr;
31 gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
34 * \brief delay the input by a certain number of samples
37 class gr_delay : public gr_sync_block
39 friend gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
41 gr_delay (size_t itemsize, int delay);
46 int delay () const { return history()-1; }
47 void set_delay (int delay) { set_history(delay+1); }
49 int work (int noutput_items,
50 gr_vector_const_void_star &input_items,
51 gr_vector_void_star &output_items);