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

/*
 * Copyright 2010 KA1RBI
 * 
 * This file is part of OP25.
 * 
 * OP25 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 2, or (at your option)
 * any later version.
 * 
 * OP25 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 OP25; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef INCLUDED_OP25_FSK4_SLICER_FB_H
#define INCLUDED_OP25_FSK4_SLICER_FB_H

#include <gr_sync_block.h>

/**
 * We use boost::shared_ptr's instead of raw pointers for all access
 * to gr_blocks (and many other data structures).  The shared_ptr gets
 * us transparent reference counting, which greatly simplifies storage
 * management issues.  This is especially helpful in our hybrid
 * C++ / Python system.
 *
 * See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
 *
 * As a convention, the _sptr suffix indicates a boost::shared_ptr
 */
typedef boost::shared_ptr<class op25_fsk4_slicer_fb> op25_fsk4_slicer_fb_sptr;

/**
 * Return a shared_ptr to a new instance of op25_fsk4_slicer_fb.  To
 * avoid accidental use of raw pointers, op25_fsk4_slicer_fb's
 * constructor is private.  op25_make_fsk4_slicer_fb is the public
 * interface for creating new instances.
 */
op25_fsk4_slicer_fb_sptr op25_make_fsk4_slicer_fb (const std::vector<float> &slice_levels);

/**
 * Produce a stream of dibits, given a stream of floats in [-3,-1,1,3].
 * \ingroup block
 *
 * This uses the preferred technique: subclassing gr_sync_block.
 */
class op25_fsk4_slicer_fb : public gr_sync_block
{

public:

   virtual ~op25_fsk4_slicer_fb ();

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

private:

   /**
    * The friend declaration allows op25_make_fsk4_slicer_fb to access
    * the private constructor.
    */
   friend op25_fsk4_slicer_fb_sptr op25_make_fsk4_slicer_fb (const std::vector<float> &slice_levels);

   op25_fsk4_slicer_fb (const std::vector<float> &slice_levels);

   float d_slice_levels[4];

};

#endif /* INCLUDED_OP25_FSK4_SLICER_FB_H */