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-rw-r--r--gr-atsc/lib/atsc_equalizer.cc105
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diff --git a/gr-atsc/lib/atsc_equalizer.cc b/gr-atsc/lib/atsc_equalizer.cc
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2010 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <atsc/equalizer.h>
+#include <atsc/create_atsci_equalizer.h>
+#include <gr_io_signature.h>
+#include <atsc/consts.h>
+#include <atsc/syminfo_impl.h>
+
+
+atsc_equalizer_sptr
+atsc_make_equalizer()
+{
+ return gnuradio::get_initial_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;
+}