1 files changed, 79 insertions, 0 deletions
diff --git a/gr-atsc/lib/atsc_derandomizer.cc b/gr-atsc/lib/atsc_derandomizer.cc
new file mode 100644
index 0000000000..79b3612af4
--- /dev/null
+++ b/gr-atsc/lib/atsc_derandomizer.cc
@@ -0,0 +1,79 @@
+/* -*- 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/derandomizer.h>
+#include <gr_io_signature.h>
+#include <atsc/consts.h>
+
+
+atsc_derandomizer_sptr
+atsc_make_derandomizer()
+{
+  return gnuradio::get_initial_sptr(new atsc_derandomizer());
+}
+
+atsc_derandomizer::atsc_derandomizer()
+  : gr_sync_block("atsc_derandomizer",
+		  gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet_no_sync)),
+		  gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet)))
+{
+  reset();
+}
+
+void
+atsc_derandomizer::reset()
+{
+  d_rand.reset();
+}
+
+int
+atsc_derandomizer::work (int noutput_items,
+			 gr_vector_const_void_star &input_items,
+			 gr_vector_void_star &output_items)
+{
+  const atsc_mpeg_packet_no_sync *in = (const atsc_mpeg_packet_no_sync *) input_items[0];
+  atsc_mpeg_packet *out = (atsc_mpeg_packet *) output_items[0];
+
+  for (int i = 0; i < noutput_items; i++){
+
+    assert(in[i].pli.regular_seg_p());
+
+    if (in[i].pli.first_regular_seg_p())
+      d_rand.reset();
+
+    d_rand.derandomize(out[i], in[i]);
+
+    // Check the pipeline info for error status and and set the
+    // corresponding bit in transport packet header.
+
+    if (in[i].pli.transport_error_p())
+      out[i].data[1] |= MPEG_TRANSPORT_ERROR_BIT;
+    else
+      out[i].data[1] &= ~MPEG_TRANSPORT_ERROR_BIT;
+  }
+
+  return noutput_items;
+}