Merge branch 'upstream' into dfsg-orig

[debian/gnuradio] / gnuradio-core / src / lib / filter / gri_fft_filter_ccc_generic.h

diff --git a/gnuradio-core/src/lib/filter/gri_fft_filter_ccc_generic.h b/gnuradio-core/src/lib/filter/gri_fft_filter_ccc_generic.h
new file mode 100644 (file)
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+++ b/gnuradio-core/src/lib/filter/gri_fft_filter_ccc_generic.h
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+/* -*- 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_GENERIC_H
+#define INCLUDED_GRI_FFT_FILTER_CCC_GENERIC_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 gri_fft_filter_ccc_generic
+{
+ 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
+  std::vector<gr_complex>  d_xformed_taps;     // Fourier 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_generic (int decimation, const std::vector<gr_complex> &taps);
+  ~gri_fft_filter_ccc_generic ();
+
+  /*!
+   * \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_GENERIC_H */