GNU Radio 3.4.2 C++ API
gr_scrambler_bb.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2008 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 #ifndef INCLUDED_GR_SCRAMBLER_BB_H
00023 #define INCLUDED_GR_SCRAMBLER_BB_H
00024 
00025 #include <gr_sync_block.h>
00026 #include "gri_lfsr.h"
00027 
00028 class gr_scrambler_bb;
00029 typedef boost::shared_ptr<gr_scrambler_bb> gr_scrambler_bb_sptr;
00030 
00031 gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
00032 
00033 /*!
00034  * Scramble an input stream using an LFSR.  This block works on the LSB only
00035  * of the input data stream, i.e., on an "unpacked binary" stream, and 
00036  * produces the same format on its output.
00037  * 
00038  * \param mask     Polynomial mask for LFSR
00039  * \param seed     Initial shift register contents
00040  * \param len      Shift register length
00041  *
00042  * \ingroup coding_blk
00043  */
00044 
00045 class gr_scrambler_bb : public gr_sync_block
00046 {
00047   friend gr_scrambler_bb_sptr gr_make_scrambler_bb(int mask, int seed, int len);
00048 
00049   gri_lfsr d_lfsr;
00050 
00051   gr_scrambler_bb(int mask, int seed, int len);
00052 
00053 public:
00054   int work(int noutput_items,
00055            gr_vector_const_void_star &input_items,
00056            gr_vector_void_star &output_items);
00057 };
00058 
00059 #endif /* INCLUDED_GR_SCRAMBLER_BB_H */