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

/*

 * Copyright 2004,2010 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gr_filter_delay_fc.h>

#include <gr_fir_fff.h>

#include <gr_fir_util.h>

// public constructor

gr_filter_delay_fc_sptr 

gr_make_filter_delay_fc (const std::vector<float> &taps) 

{

  return gnuradio::get_initial_sptr(new gr_filter_delay_fc (taps));

}

gr_filter_delay_fc::gr_filter_delay_fc (const std::vector<float> &taps)

  : gr_sync_block ("filter_delay_fc",

                   gr_make_io_signature (1, 2, sizeof (float)),

                   gr_make_io_signature (1, 1, sizeof (gr_complex)))

{

  d_fir = gr_fir_util::create_gr_fir_fff (taps);

  d_delay = d_fir->ntaps () / 2;

  set_history (d_fir->ntaps ());

}

gr_filter_delay_fc::~gr_filter_delay_fc ()

{

  delete d_fir;

}

int

gr_filter_delay_fc::work (int noutput_items,

                     gr_vector_const_void_star &input_items,

                     gr_vector_void_star &output_items)

{

  float *in0  = (float *) input_items[0];

  float *in1  = (float *) input_items[1];

  gr_complex *out = (gr_complex *) output_items[0];

  switch (input_items.size ()){

  case 1:

    for (int i = 0; i < noutput_items; i++)

      out[i] = gr_complex (in0[i + d_delay], 

                           d_fir->filter (&in0[i]));

    break;

  case 2:

    for (int j = 0; j < noutput_items; j++)

      out[j] = gr_complex (in0[j + d_delay],

                                d_fir->filter (&in1[j]));

    break;

  default:

    assert (0);

  }

  return noutput_items;

}