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/* -*- c++ -*- */
/*
* Copyright 2006,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_DIFF_ENCODER_BB_H
#define INCLUDED_GR_DIFF_ENCODER_BB_H
#include <digital_api.h>
#include <gr_sync_block.h>
class digital_diff_encoder_bb;
typedef boost::shared_ptr<digital_diff_encoder_bb> digital_diff_encoder_bb_sptr;
DIGITAL_API digital_diff_encoder_bb_sptr
digital_make_diff_encoder_bb(unsigned int modulus);
/*!
* \brief y[0] = (x[0] + y[-1]) % M
* \ingroup coding_blk
*
* Uses current and previous symbols and the alphabet modulus to
* perform differential encoding.
*/
class DIGITAL_API digital_diff_encoder_bb : public gr_sync_block
{
friend DIGITAL_API digital_diff_encoder_bb_sptr
digital_make_diff_encoder_bb(unsigned int modulus);
digital_diff_encoder_bb(unsigned int modulus);
unsigned int d_last_out;
unsigned int d_modulus;
public:
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif
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