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

/*

 * Copyright 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.

 */

#ifndef INCLUDED_GRI_FFT_FILTER_CCC_SSE_H

#define INCLUDED_GRI_FFT_FILTER_CCC_SSE_H

#include <gr_core_api.h>

#include <gr_complex.h>

#include <vector>

class gri_fft_complex;

/*!

 * \brief Fast FFT filter with gr_complex input, gr_complex output and gr_complex taps

 * \ingroup filter_blk

 */

class GR_CORE_API gri_fft_filter_ccc_sse

{

 private:

  int                           d_ntaps;

  int                           d_nsamples;

  int                           d_fftsize;                // fftsize = ntaps + nsamples - 1

  int                      d_decimation;

  gri_fft_complex          *d_fwdfft;                // forward "plan"

  gri_fft_complex          *d_invfft;                // inverse "plan"

  std::vector<gr_complex>  d_tail;                // state carried between blocks for overlap-add

  gr_complex              *d_xformed_taps;

  std::vector<gr_complex>  d_new_taps;

  void compute_sizes(int ntaps);

  int tailsize() const { return d_ntaps - 1; }

 public:

  /*!

   * \brief Construct an FFT filter for complex vectors with the given taps and decimation rate.

   *

   * This is the basic implementation for performing FFT filter for fast convolution

   * in other blocks for complex vectors (such as gr_fft_filter_ccc).

   * \param decimation The decimation rate of the filter (int)

   * \param taps       The filter taps (complex)

   */

  gri_fft_filter_ccc_sse (int decimation, const std::vector<gr_complex> &taps);

  ~gri_fft_filter_ccc_sse ();

  /*!

   * \brief Set new taps for the filter.

   *

   * Sets new taps and resets the class properties to handle different sizes

   * \param taps       The filter taps (complex)

   */

  int set_taps (const std::vector<gr_complex> &taps);

  /*!

   * \brief Perform the filter operation

   *

   * \param nitems  The number of items to produce

   * \param input   The input vector to be filtered

   * \param output  The result of the filter operation

   */

  int filter (int nitems, const gr_complex *input, gr_complex *output);

};

#endif /* INCLUDED_GRI_FFT_FILTER_CCC_SSE_H */