/* -*- 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.

 */

#ifndef INCLUDED_GR_FRACTIONAL_INTERPOLATOR_H

#define        INCLUDED_GR_FRACTIONAL_INTERPOLATOR_H

#include <gr_block.h>

class gri_mmse_fir_interpolator;

class gr_fractional_interpolator;

typedef boost::shared_ptr<gr_fractional_interpolator> gr_fractional_interpolator_sptr;

// public constructor

gr_fractional_interpolator_sptr gr_make_fractional_interpolator (float phase_shift, float interp_ratio);

/*!

 * \brief Interpolating mmse filter with float input, float output

 * \ingroup filter

 */

class gr_fractional_interpolator : public gr_block

{

 public:

  ~gr_fractional_interpolator ();

  void forecast(int noutput_items, gr_vector_int &ninput_items_required);

  int general_work (int noutput_items,

                    gr_vector_int &ninput_items,

                    gr_vector_const_void_star &input_items,

                    gr_vector_void_star &output_items);

protected:

  gr_fractional_interpolator (float phase_shift, float interp_ratio);

 private:

  float                         d_mu;

  float                         d_mu_inc;

  gri_mmse_fir_interpolator         *d_interp;

  friend gr_fractional_interpolator_sptr

    gr_make_fractional_interpolator (float phase_shift, float interp_ratio);

};

#endif