GNU Radio Manual and C++ API Reference  3.7.9.2
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sync_decimator.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004, 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
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10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
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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
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22 
23 #ifndef INCLUDED_GR_RUNTIME_SYNC_DECIMATOR_H
24 #define INCLUDED_GR_RUNTIME_SYNC_DECIMATOR_H
25 
26 #include <gnuradio/api.h>
27 #include <gnuradio/sync_block.h>
28 
29 namespace gr {
30 
31  /*!
32  * \brief synchronous N:1 input to output with history
33  * \ingroup base_blk
34  *
35  * Override work to provide the signal processing implementation.
36  */
38  {
39  private:
40  unsigned d_decimation;
41 
42  protected:
43  sync_decimator(void) {} // allows pure virtual interface sub-classes
44  sync_decimator(const std::string &name,
45  gr::io_signature::sptr input_signature,
46  gr::io_signature::sptr output_signature,
47  unsigned decimation);
48 
49  public:
50  unsigned decimation() const { return d_decimation; }
51  void set_decimation(unsigned decimation)
52  {
53  d_decimation = decimation;
54  set_relative_rate(1.0 / decimation);
55  }
56 
57  // gr::sync_decimator overrides these to assist work
58  void forecast(int noutput_items, gr_vector_int &ninput_items_required);
59  int general_work(int noutput_items,
60  gr_vector_int &ninput_items,
61  gr_vector_const_void_star &input_items,
62  gr_vector_void_star &output_items);
63 
64  // derived classes should override work
65 
66  int fixed_rate_ninput_to_noutput(int ninput);
67  int fixed_rate_noutput_to_ninput(int noutput);
68  };
69 
70 } /* namespace gr */
71 
72 #endif /* INCLUDED_GR_RUNTIME_SYNC_DECIMATOR_H */
boost::shared_ptr< io_signature > sptr
Definition: io_signature.h:45
std::vector< const void * > gr_vector_const_void_star
Definition: gnuradio-runtime/include/gnuradio/types.h:38
void set_decimation(unsigned decimation)
Definition: sync_decimator.h:51
#define GR_RUNTIME_API
Definition: gnuradio-runtime/include/gnuradio/api.h:30
std::vector< void * > gr_vector_void_star
Definition: gnuradio-runtime/include/gnuradio/types.h:37
std::vector< int > gr_vector_int
Definition: gnuradio-runtime/include/gnuradio/types.h:33
Include this header to use the message passing features.
Definition: logger.h:131
synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...
Definition: sync_block.h:37
synchronous N:1 input to output with historyOverride work to provide the signal processing implementa...
Definition: sync_decimator.h:37
sync_decimator(void)
Definition: sync_decimator.h:43
unsigned decimation() const
Definition: sync_decimator.h:50