/* -*- Mode: 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 3, 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., 51 Franklin Street, Boston, MA
 * 02110-1301, USA.
 */

/*
 * config.h is generated by configure.  It contains the results
 * of probing for features, options etc.  It should be the first
 * file included in your .cc file.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <op25_fsk4_slicer_fb.h>
#include <gr_io_signature.h>
#include <stdio.h>

/*
 * Create a new instance of op25_fsk4_slicer_fb and return
 * a boost shared_ptr.  This is effectively the public constructor.
 */
op25_fsk4_slicer_fb_sptr 
op25_make_fsk4_slicer_fb(const std::vector<float> &slice_levels)
{
  return op25_fsk4_slicer_fb_sptr(new op25_fsk4_slicer_fb (slice_levels));
}

/*
 * Specify constraints on number of input and output streams.
 * This info is used to construct the input and output signatures
 * (2nd & 3rd args to gr_block's constructor).  The input and
 * output signatures are used by the runtime system to
 * check that a valid number and type of inputs and outputs
 * are connected to this block.  In this case, we accept
 * only 1 input and 1 output.
 */
static const int MIN_IN = 1;	// mininum number of input streams
static const int MAX_IN = 1;	// maximum number of input streams
static const int MIN_OUT = 1;	// minimum number of output streams
static const int MAX_OUT = 1;	// maximum number of output streams

/*
 * The private constructor
 */
op25_fsk4_slicer_fb::op25_fsk4_slicer_fb(const std::vector<float> &slice_levels)
  : gr_sync_block("fsk4_slicer_fb",
		   gr_make_io_signature(MIN_IN, MAX_IN, sizeof(float)),
		   gr_make_io_signature(MIN_OUT, MAX_OUT, sizeof(unsigned char)))
{
	d_slice_levels[0] = slice_levels[0];
	d_slice_levels[1] = slice_levels[1];
	d_slice_levels[2] = slice_levels[2];
	d_slice_levels[3] = slice_levels[3];
}

/*
 * Our virtual destructor.
 */
op25_fsk4_slicer_fb::~op25_fsk4_slicer_fb()
{
  // nothing else required in this example
}

int 
op25_fsk4_slicer_fb::work(int noutput_items,
			gr_vector_const_void_star &input_items,
			gr_vector_void_star &output_items)
{
  const float *in = (const float *) input_items[0];
  unsigned char *out = (unsigned char *) output_items[0];

  for(int i = 0; i < noutput_items; i++){
#if 0
    if(in[i] < -2.0) {
      out[i] = 3;
    } else if(in[i] < 0.0) {
      out[i] = 2;
    } else if(in[i] <  2.0) {
      out[i] = 0;
    } else {
      out[i] = 1;
    }
#endif
    uint8_t dibit;
    float sym = in[i];
    if(d_slice_levels[3] < 0) {
      dibit = 1;
      if(d_slice_levels[3] <= sym && sym < d_slice_levels[0])
        dibit = 3;
    } else {
      dibit = 3;
      if(d_slice_levels[2] <= sym && sym < d_slice_levels[3])
        dibit = 1;
    }
    if(d_slice_levels[0] <= sym && sym < d_slice_levels[1])
      dibit = 2;
    if(d_slice_levels[1] <= sym && sym < d_slice_levels[2])
      dibit = 0;
    out[i] = dibit;
  }

  // Tell runtime system how many output items we produced.
  return noutput_items;
}