Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / general / gr_squash_ff.cc

diff --git a/gnuradio-core/src/lib/general/gr_squash_ff.cc b/gnuradio-core/src/lib/general/gr_squash_ff.cc
new file mode 100644 (file)
index 0000000..05ad4a7
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_squash_ff.cc
@@ -0,0 +1,93 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 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 <stdexcept>
+#include <gr_squash_ff.h>
+#include <gr_io_signature.h>
+
+// expect input vector of igrid.size y-values,
+// produce output vector of ogrid.size y-values
+
+gr_squash_ff_sptr
+gr_make_squash_ff(const std::vector<float> &igrid,
+                 const std::vector<float> &ogrid)
+{
+  return gr_squash_ff_sptr(new gr_squash_ff(igrid, ogrid));
+}
+
+gr_squash_ff::gr_squash_ff(const std::vector<float> &igrid,
+                          const std::vector<float> &ogrid)
+  : gr_sync_block("squash_ff",
+                 gr_make_io_signature(1, 1, sizeof(float) * igrid.size()),
+                 gr_make_io_signature(1, 1, sizeof(float) * ogrid.size()))
+{
+  d_inum  = igrid.size();
+  d_onum  = ogrid.size();
+  d_igrid = (double *) malloc(d_inum * sizeof(double));
+  d_iwork = (double *) malloc(d_inum * sizeof(double));
+  d_ogrid = (double *) malloc(d_onum * sizeof(double));
+  for (unsigned int i = 0; i < d_inum; i++)
+    d_igrid[i] = igrid[i];
+  for (unsigned int i = 0; i < d_onum; i++)
+    d_ogrid[i] = ogrid[i];
+
+  d_accel = gsl_interp_accel_alloc();
+  d_spline = gsl_spline_alloc(gsl_interp_cspline, d_inum);     // FIXME check w/ Frank
+}
+
+gr_squash_ff::~gr_squash_ff()
+{
+  free((char *) d_igrid);
+  free((char *) d_iwork);
+  free((char *) d_ogrid);
+  gsl_interp_accel_free(d_accel);
+  gsl_spline_free(d_spline);
+}
+
+int
+gr_squash_ff::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];
+
+  for (int count = 0; count < noutput_items; count++) {
+
+    for (unsigned int i = 0; i < d_inum; i++)
+      d_iwork[i] = in[i];
+
+    gsl_spline_init(d_spline, d_igrid, d_iwork, d_inum);
+    
+    for (unsigned int i = 0; i < d_onum; i++)
+      out[i] = gsl_spline_eval(d_spline, d_ogrid[i], d_accel);
+
+    in  += d_inum;
+    out += d_onum;
+  }
+
+  return noutput_items;
+}