GNU Radio Manual and C++ API Reference  3.7.9.2
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throttle.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2005-2011,2013 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
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)
10  * any later version.
11  *
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.
16  *
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,
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21  */
22 
23 #ifndef INCLUDED_GR_THROTTLE_H
24 #define INCLUDED_GR_THROTTLE_H
25 
26 #include <gnuradio/blocks/api.h>
27 #include <gnuradio/sync_block.h>
28 
29 namespace gr {
30  namespace blocks {
31 
32  /*!
33  * \brief throttle flow of samples such that the average rate does
34  * not exceed samples_per_sec.
35  * \ingroup misc_blk
36  *
37  * \details
38  * input: one stream of itemsize; output: one stream of itemsize
39  *
40  * N.B. this should only be used in GUI apps where there is no
41  * other rate limiting block. It is not intended nor effective at
42  * precisely controlling the rate of samples. That should be
43  * controlled by a source or sink tied to sample clock. E.g., a
44  * USRP or audio card.
45  */
46  class BLOCKS_API throttle : virtual public sync_block
47  {
48  public:
49  typedef boost::shared_ptr<throttle> sptr;
50 
51  static sptr make(size_t itemsize, double samples_per_sec, bool ignore_tags=true);
52 
53  //! Sets the sample rate in samples per second.
54  virtual void set_sample_rate(double rate) = 0;
55 
56  //! Get the sample rate in samples per second.
57  virtual double sample_rate() const = 0;
58  };
59 
60  } /* namespace blocks */
61 } /* namespace gr */
62 
63 #endif /* INCLUDED_GR_THROTTLE_H */
boost::shared_ptr< throttle > sptr
Definition: throttle.h:49
Include this header to use the message passing features.
Definition: logger.h:131
#define BLOCKS_API
Definition: gr-blocks/include/gnuradio/blocks/api.h:30
synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...
Definition: sync_block.h:37
throttle flow of samples such that the average rate does not exceed samples_per_sec.
Definition: throttle.h:46
BLOCKS_API size_t itemsize(vector_type type)