/* -*- 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_PHASOR_CC_H
#define INCLUDED_GR_DIFF_PHASOR_CC_H

#include <digital_api.h>
#include <gr_sync_block.h>

/*!
 * \brief Differential decoding based on phase change.
 * \ingroup coding_blk
 *
 * Uses the phase difference between two symbols to determine the
 * output symbol:
 *
 *     out[i] = in[i] * conj(in[i-1]);
 */
class digital_diff_phasor_cc;
typedef boost::shared_ptr<digital_diff_phasor_cc> digital_diff_phasor_cc_sptr;

DIGITAL_API digital_diff_phasor_cc_sptr digital_make_diff_phasor_cc();


class DIGITAL_API digital_diff_phasor_cc : public gr_sync_block
{
  friend DIGITAL_API digital_diff_phasor_cc_sptr
    digital_make_diff_phasor_cc();

  digital_diff_phasor_cc();  //constructor

 public:
  ~digital_diff_phasor_cc();	//destructor

  int work(int noutput_items,
	   gr_vector_const_void_star &input_items,
	   gr_vector_void_star &output_items);
};

#endif