1 files changed, 87 insertions, 0 deletions
diff --git a/gr-atsc/lib/atsc_randomizer.cc b/gr-atsc/lib/atsc_randomizer.cc
new file mode 100644
index 0000000000..8f88c51a26
--- /dev/null
+++ b/gr-atsc/lib/atsc_randomizer.cc
@@ -0,0 +1,87 @@
+/* -*- 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/randomizer.h>
+#include <gr_io_signature.h>
+#include <atsc/consts.h>
+
+
+atsc_randomizer_sptr
+atsc_make_randomizer()
+{
+  return gnuradio::get_initial_sptr(new atsc_randomizer());
+}
+
+atsc_randomizer::atsc_randomizer()
+  : gr_sync_block("atsc_randomizer",
+		  gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet)),
+		  gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet_no_sync)))
+{
+  reset();
+}
+
+void
+atsc_randomizer::reset()
+{
+  d_rand.reset();
+  d_field2 = false;
+  d_segno = 0;
+}
+
+int
+atsc_randomizer::work (int noutput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items)
+{
+  const atsc_mpeg_packet *in = (const atsc_mpeg_packet *) input_items[0];
+  atsc_mpeg_packet_no_sync *out = (atsc_mpeg_packet_no_sync *) output_items[0];
+
+  for (int i = 0; i < noutput_items; i++){
+
+    // sanity check incoming data.
+    assert((in[i].data[0] == MPEG_SYNC_BYTE));
+    assert((in[i].data[1] & MPEG_TRANSPORT_ERROR_BIT) == 0);
+
+    // initialize plinfo for downstream
+    //
+    // We do this here because the randomizer is effectively
+    // the head of the tx processing chain
+    //
+    out[i].pli.set_regular_seg(d_field2, d_segno);
+    d_segno++;
+    if (d_segno == 312){
+      d_segno = 0;
+      d_field2 = !d_field2;
+    }
+
+    if (out[i].pli.first_regular_seg_p())
+      d_rand.reset();
+
+    d_rand.randomize(out[i], in[i]);
+  }
+
+  return noutput_items;
+}