GNU Radio 3.6.2 C++ API
gr_delay.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2007,2012 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
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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.
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22 
23 #ifndef INCLUDED_GR_DELAY_H
24 #define INCLUDED_GR_DELAY_H
25 
26 #include <gr_core_api.h>
27 #include <gr_block.h>
28 #include <gruel/thread.h>
29 
30 class gr_delay;
32 
33 GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
34 
35 /*!
36  * \brief delay the input by a certain number of samples
37  * \ingroup misc_blk
38  */
40 {
41  friend GR_CORE_API gr_delay_sptr gr_make_delay (size_t itemsize, int delay);
42 
43  gr_delay (size_t itemsize, int delay);
44 
45  void forecast (int noutput_items, gr_vector_int &ninput_items_required);
46 
47  size_t d_itemsize;
48  int d_delta;
49  gruel::mutex d_mutex_delay;
50 
51  public:
52  int delay () const { return history()-1; }
53  void set_delay (int delay);
54 
55  int general_work (int noutput_items,
56  gr_vector_int &ninput_items,
57  gr_vector_const_void_star &input_items,
58  gr_vector_void_star &output_items);
59 };
60 
61 #endif