GNU Radio 3.6.1 C++ API
gr_scrambler_bb.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2008 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 #ifndef INCLUDED_GR_SCRAMBLER_BB_H
23 #define INCLUDED_GR_SCRAMBLER_BB_H
24 
25 #include <gr_core_api.h>
26 #include <gr_sync_block.h>
27 #include "gri_lfsr.h"
28 
29 class gr_scrambler_bb;
31 
32 GR_CORE_API gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
33 
34 /*!
35  * Scramble an input stream using an LFSR. This block works on the LSB only
36  * of the input data stream, i.e., on an "unpacked binary" stream, and
37  * produces the same format on its output.
38  *
39  * \param mask Polynomial mask for LFSR
40  * \param seed Initial shift register contents
41  * \param len Shift register length
42  *
43  * \ingroup coding_blk
44  */
45 
47 {
48  friend GR_CORE_API gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
49 
50  gri_lfsr d_lfsr;
51 
52  gr_scrambler_bb(int mask, int seed, int len);
53 
54 public:
55  int work(int noutput_items,
56  gr_vector_const_void_star &input_items,
57  gr_vector_void_star &output_items);
58 };
59 
60 #endif /* INCLUDED_GR_SCRAMBLER_BB_H */