1 files changed, 70 insertions, 0 deletions
diff --git a/gnuradio-runtime/lib/gr_sync_interpolator.cc b/gnuradio-runtime/lib/gr_sync_interpolator.cc
new file mode 100644
index 0000000000..ece873c14a
--- /dev/null
+++ b/gnuradio-runtime/lib/gr_sync_interpolator.cc
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2008 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 <gr_sync_interpolator.h>
+
+gr_sync_interpolator::gr_sync_interpolator (const std::string &name,
+					    gr_io_signature_sptr input_signature,
+					    gr_io_signature_sptr output_signature,
+					    unsigned interpolation)
+  : gr_sync_block (name, input_signature, output_signature)
+{
+  set_interpolation (interpolation);
+}
+
+void
+gr_sync_interpolator::forecast (int noutput_items, gr_vector_int &ninput_items_required)
+{
+  unsigned ninputs = ninput_items_required.size ();
+  for (unsigned i = 0; i < ninputs; i++)
+    ninput_items_required[i] = fixed_rate_noutput_to_ninput(noutput_items);
+}
+
+int
+gr_sync_interpolator::fixed_rate_noutput_to_ninput(int noutput_items)
+{
+  return noutput_items / interpolation() + history() - 1;
+}
+
+int
+gr_sync_interpolator::fixed_rate_ninput_to_noutput(int ninput_items)
+{
+  return std::max(0, ninput_items - (int)history() + 1) * interpolation();
+}
+
+int
+gr_sync_interpolator::general_work (int noutput_items,
+				    gr_vector_int &ninput_items,
+				    gr_vector_const_void_star &input_items,
+				    gr_vector_void_star &output_items)
+{
+  int	r = work (noutput_items, input_items, output_items);
+  if (r > 0)
+    consume_each (r / interpolation ());
+  return r;
+}
+
+