3 * Copyright 2005 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.
22 #ifndef INCLUDED_GR_THROTTLE_H
23 #define INCLUDED_GR_THROTTLE_H
25 #include <gr_sync_block.h>
26 #ifdef HAVE_SYS_TIME_H
31 typedef boost::shared_ptr<gr_throttle> gr_throttle_sptr;
34 gr_throttle_sptr gr_make_throttle(size_t itemsize, double samples_per_sec);
37 * \brief throttle flow of samples such that the average rate does not exceed samples_per_sec.
40 * input: one stream of itemsize; output: one stream of itemsize
42 * N.B. this should only be used in GUI apps where there is no other
43 * rate limiting block. It is not intended nor effective at precisely
44 * controlling the rate of samples. That should be controlled by a
45 * source or sink tied to sample clock. E.g., a USRP or audio card.
47 class gr_throttle : public gr_sync_block
49 friend gr_throttle_sptr gr_make_throttle(size_t itemsize, double samples_per_sec);
51 double d_samples_per_sec;
52 double d_total_samples;
53 #ifdef HAVE_SYS_TIME_H
54 struct timeval d_start;
57 gr_throttle(size_t itemsize, double samples_per_sec);
62 int work (int noutput_items,
63 gr_vector_const_void_star &input_items,
64 gr_vector_void_star &output_items);
68 #endif /* INCLUDED_GR_THROTTLE_H */