GNU Radio 3.5.3.1 C++ API
gr_skiphead.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2005 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_SKIPHEAD_H
24 #define INCLUDED_GR_SKIPHEAD_H
25 
26 #include <gr_core_api.h>
27 #include <gr_sync_block.h>
28 #include <stddef.h> // size_t
29 
30 class gr_skiphead;
32 
34 gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);
35 
36 
37 /*!
38  * \brief skips the first N items, from then on copies items to the output
39  * \ingroup slicedice_blk
40  *
41  * Useful for building test cases and sources which have metadata or junk at the start
42  */
43 
45 {
46  friend GR_CORE_API gr_skiphead_sptr gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);
47  gr_skiphead (size_t itemsize, uint64_t nitems_to_skip);
48 
49  uint64_t d_nitems_to_skip;
50  uint64_t d_nitems; // total items seen
51 
52  public:
53 
54  int general_work(int noutput_items,
55  gr_vector_int &ninput_items,
56  gr_vector_const_void_star &input_items,
57  gr_vector_void_star &output_items);
58 };
59 
60 #endif /* INCLUDED_GR_SKIPHEAD_H */