GNU Radio 3.6.4 C++ API
gr_keep_m_in_n.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2012 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,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef INCLUDED_GR_KEEP_M_IN_N_H
24 #define INCLUDED_GR_KEEP_M_IN_N_H
25 
26 #include <gr_core_api.h>
27 #include <gr_block.h>
28 
29 class gr_keep_m_in_n;
31 
33 gr_make_keep_m_in_n (size_t item_size, int m, int n, int offset);
34 
35 
36 /*!
37  * \brief decimate a stream, keeping one item out of every n.
38  * \ingroup slicedice_blk
39  */
41 {
43  gr_make_keep_m_in_n (size_t item_size, int m, int n, int offset);
44 
45  int d_n;
46  int d_m;
47  int d_count;
48  int d_offset;
49  int d_itemsize;
50 
51  protected:
52  gr_keep_m_in_n (size_t item_size, int m, int n, int offset);
53  void forecast (int noutput_items, gr_vector_int &ninput_items_required);
54 
55  public:
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);
60 
61  void set_offset(int offset);
62  void set_n(int n){ d_n = n; }
63  void set_m(int m){ d_m = m; }
64 
65 };
66 
67 #endif /* INCLUDED_GR_KEEP_M_IN_N_H */