GNU Radio 3.6.5 C++ API

digital_diff_encoder_bb.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006,2012 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 
00023 #ifndef INCLUDED_GR_DIFF_ENCODER_BB_H
00024 #define INCLUDED_GR_DIFF_ENCODER_BB_H
00025 
00026 #include <digital_api.h>
00027 #include <gr_sync_block.h>
00028 
00029 class digital_diff_encoder_bb;
00030 typedef boost::shared_ptr<digital_diff_encoder_bb> digital_diff_encoder_bb_sptr;
00031 
00032 DIGITAL_API digital_diff_encoder_bb_sptr
00033 digital_make_diff_encoder_bb(unsigned int modulus);
00034 
00035 /*!
00036  * \brief y[0] = (x[0] + y[-1]) % M
00037  * \ingroup symbol_coding_blk
00038  *
00039  * \details
00040  * Uses current and previous symbols and the alphabet modulus to
00041  * perform differential encoding.
00042  */
00043 class DIGITAL_API digital_diff_encoder_bb : public gr_sync_block
00044 {
00045   friend DIGITAL_API digital_diff_encoder_bb_sptr
00046     digital_make_diff_encoder_bb(unsigned int modulus);
00047   digital_diff_encoder_bb(unsigned int modulus);
00048 
00049   unsigned int  d_last_out;
00050   unsigned int  d_modulus;
00051 
00052  public:
00053   int work(int noutput_items,
00054            gr_vector_const_void_star &input_items,
00055            gr_vector_void_star &output_items);
00056 };
00057 
00058 #endif