/* -*- c++ -*- */

/*

 * Copyright 2006 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_DECODER_BB_H

#define INCLUDED_GR_DIFF_DECODER_BB_H

#include <gr_sync_block.h>

class gr_diff_decoder_bb;

typedef boost::shared_ptr<gr_diff_decoder_bb> gr_diff_decoder_bb_sptr;

gr_diff_decoder_bb_sptr gr_make_diff_decoder_bb (unsigned int modulus);

/*!

 * \brief y[0] = (x[0] - x[-1]) % M

 * \ingroup block

 *

 * Differential decoder

 */

class gr_diff_decoder_bb : public gr_sync_block

{

  friend gr_diff_decoder_bb_sptr gr_make_diff_decoder_bb (unsigned int modulus);

  gr_diff_decoder_bb(unsigned int modulus);

  unsigned int        d_modulus;

 public:

  int work (int noutput_items,

            gr_vector_const_void_star &input_items,

            gr_vector_void_star &output_items);

};

#endif