Merge commit 'v3.3.0' into upstream

[debian/gnuradio] / gnuradio-core / src / lib / filter / gr_pfb_interpolator_ccf.cc

diff --git a/gnuradio-core/src/lib/filter/gr_pfb_interpolator_ccf.cc b/gnuradio-core/src/lib/filter/gr_pfb_interpolator_ccf.cc
new file mode 100644 (file)
index 0000000..6a9598f
--- /dev/null
+++ b/gnuradio-core/src/lib/filter/gr_pfb_interpolator_ccf.cc
@@ -0,0 +1,143 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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_pfb_interpolator_ccf.h>
+#include <gr_fir_ccf.h>
+#include <gr_fir_util.h>
+#include <gr_io_signature.h>
+#include <cstdio>
+
+gr_pfb_interpolator_ccf_sptr gr_make_pfb_interpolator_ccf (unsigned int interp, 
+                                                          const std::vector<float> &taps)
+{
+  return gr_pfb_interpolator_ccf_sptr (new gr_pfb_interpolator_ccf (interp, taps));
+}
+
+
+gr_pfb_interpolator_ccf::gr_pfb_interpolator_ccf (unsigned int interp, 
+                                                 const std::vector<float> &taps)
+  : gr_sync_interpolator ("pfb_interpolator_ccf",
+                         gr_make_io_signature (1, 1, sizeof(gr_complex)),
+                         gr_make_io_signature (1, 1, sizeof(gr_complex)),
+                         interp),
+    d_updated (false)
+{
+  d_rate = interp;
+  d_filters = std::vector<gr_fir_ccf*>(d_rate);
+
+  // Create an FIR filter for each channel and zero out the taps
+  std::vector<float> vtaps(0, d_rate);
+  for(unsigned int i = 0; i < d_rate; i++) {
+    d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
+  }
+
+  // Now, actually set the filters' taps
+  set_taps(taps);
+}
+
+gr_pfb_interpolator_ccf::~gr_pfb_interpolator_ccf ()
+{
+  for(unsigned int i = 0; i < d_rate; i++) {
+    delete d_filters[i];
+  }
+}
+
+void
+gr_pfb_interpolator_ccf::set_taps (const std::vector<float> &taps)
+{
+  unsigned int i,j;
+
+  unsigned int ntaps = taps.size();
+  d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_rate);
+
+  // Create d_numchan vectors to store each channel's taps
+  //std::vector< std::vector<float> > vtaps(d_rate);
+  d_taps.resize(d_rate);
+
+  // Make a vector of the taps plus fill it out with 0's to fill
+  // each polyphase filter with exactly d_taps_per_filter
+  std::vector<float> tmp_taps;
+  tmp_taps = taps;
+  while((float)(tmp_taps.size()) < d_rate*d_taps_per_filter) {
+    tmp_taps.push_back(0.0);
+  }
+  
+  // Partition the filter
+  for(i = 0; i < d_rate; i++) {
+    // Each channel uses all d_taps_per_filter with 0's if not enough taps to fill out
+    d_taps[i] = std::vector<float>(d_taps_per_filter, 0);
+    for(j = 0; j < d_taps_per_filter; j++) {
+      d_taps[i][j] = tmp_taps[i + j*d_rate];  // add taps to channels in reverse order
+    }
+    
+    // Build a filter for each channel and add it's taps to it
+    d_filters[i]->set_taps(d_taps[i]);
+  }
+
+  // Set the history to ensure enough input items for each filter
+  set_history (d_taps_per_filter);
+
+  d_updated = true;
+}
+
+void
+gr_pfb_interpolator_ccf::print_taps()
+{
+  unsigned int i, j;
+  for(i = 0; i < d_rate; i++) {
+    printf("filter[%d]: [", i);
+    for(j = 0; j < d_taps_per_filter; j++) {
+      printf(" %.4e", d_taps[i][j]);
+    }
+    printf("]\n\n");
+  }
+}
+
+int
+gr_pfb_interpolator_ccf::work (int noutput_items,
+                              gr_vector_const_void_star &input_items,
+                              gr_vector_void_star &output_items)
+{
+  gr_complex *in = (gr_complex *) input_items[0];
+  gr_complex *out = (gr_complex *) output_items[0];
+
+  if (d_updated) {
+    d_updated = false;
+    return 0;               // history requirements may have changed.
+  }
+
+  int i = 0, count = 0;
+
+  while(i < noutput_items) {
+    for(int j = 0; j < d_rate; j++) {
+      out[i] = d_filters[j]->filter(&in[count]);
+      i++;
+    }
+    count++;
+  }
+  
+  return i;
+}