Merge commit 'v3.3.0' into upstream

[debian/gnuradio] / gr-atsc / src / lib / atsc_equalizer.cc

diff --git a/gr-atsc/src/lib/atsc_equalizer.cc b/gr-atsc/src/lib/atsc_equalizer.cc
new file mode 100644 (file)
index 0000000..3053c00
--- /dev/null
+++ b/gr-atsc/src/lib/atsc_equalizer.cc
@@ -0,0 +1,105 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006 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 <atsc_equalizer.h>
+#include <create_atsci_equalizer.h>
+#include <gr_io_signature.h>
+#include <atsc_consts.h>
+#include <atsci_syminfo.h>
+
+
+atsc_equalizer_sptr
+atsc_make_equalizer()
+{
+  return atsc_equalizer_sptr(new atsc_equalizer());
+}
+
+// had atsc_equalizer(atsci_equalizer *equalizer)
+atsc_equalizer::atsc_equalizer()
+  : gr_sync_block("atsc_equalizer",
+                 gr_make_io_signature(2, 2, sizeof(float)),
+                 gr_make_io_signature(2, 2, sizeof(float)))
+{
+  d_equalizer = create_atsci_equalizer_lms();
+}
+
+atsc_equalizer::~atsc_equalizer ()
+{
+  // Anything that isn't automatically cleaned up...
+
+  delete d_equalizer;
+}
+
+
+void
+atsc_equalizer::forecast (int noutput_items, gr_vector_int &ninput_items_required)
+{
+
+  int ntaps = d_equalizer->ntaps ();
+
+  unsigned ninputs = ninput_items_required.size();
+  for (unsigned i = 0; i < ninputs; i++)
+    ninput_items_required[i] = fixed_rate_noutput_to_ninput (noutput_items + ntaps);
+
+
+}
+
+
+
+int
+atsc_equalizer::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];
+  const atsc::syminfo *in_tags = (const atsc::syminfo *) input_items[1];
+  float *out = (float *) output_items[0];
+  atsc::syminfo *out_tags = (atsc::syminfo *) output_items[1];
+
+  assert(sizeof(float) == sizeof(atsc::syminfo));
+
+  int ntaps = d_equalizer->ntaps ();
+  int npretaps = d_equalizer->npretaps ();
+
+  assert (ntaps >= 1);
+  assert (npretaps >= 0 && npretaps < ntaps);
+
+  int offset = ntaps - npretaps - 1;
+  assert (offset >= 0 && offset < ntaps);
+
+
+  // peform the actual equalization
+
+  d_equalizer->filter (in, in_tags + offset,
+                       out, noutput_items);
+
+  // write the output tags
+
+  for (int i = 0; i < noutput_items; i++)
+    out_tags[i] = in_tags[i + offset];
+
+  return noutput_items;
+}