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

/*

 * Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gr_iir_filter_ffd.h>

#include <gr_io_signature.h>

#include <stdio.h>

gr_iir_filter_ffd_sptr 

gr_make_iir_filter_ffd (const std::vector<double> &fftaps,

                        const std::vector<double> &fbtaps) throw (std::invalid_argument)

{

  return gr_iir_filter_ffd_sptr (new gr_iir_filter_ffd (fftaps, fbtaps));

}

gr_iir_filter_ffd::gr_iir_filter_ffd (const std::vector<double> &fftaps,

                                      const std::vector<double> &fbtaps) throw (std::invalid_argument)

  : gr_sync_block ("iir_filter_ffd",

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

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

    d_iir (fftaps, fbtaps),

    d_updated (false)

{

  // fprintf (stderr, "gr_iir_filter_ffd::ctor\n");

}

gr_iir_filter_ffd::~gr_iir_filter_ffd ()

{

  // nop

}

void

gr_iir_filter_ffd::set_taps (const std::vector<double> &fftaps,

                             const std::vector<double> &fbtaps) throw (std::invalid_argument)

{

  if (fftaps.size () != fbtaps.size ()){

    fprintf (stderr,

     "gr_iir_filter_ffd::set_taps: fftaps and fbtaps must have the same number of elements.\n");

    throw std::invalid_argument ("gr_iir_filter_ffd::set_taps");

  }

  d_new_fftaps = fftaps;

  d_new_fbtaps = fbtaps;

  d_updated = true;

}

int

gr_iir_filter_ffd::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];

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

  // fprintf (stderr, "gr_iir_filter_ffd::work noutput_items = %d\n", noutput_items);

  if (d_updated){

    d_iir.set_taps (d_new_fftaps, d_new_fbtaps);

    d_updated = false;

  }

  d_iir.filter_n (out, in, noutput_items);

  return noutput_items;

};