1 files changed, 85 insertions, 0 deletions
diff --git a/gr-dtv/lib/atsc_derandomizer_impl.cc b/gr-dtv/lib/atsc_derandomizer_impl.cc
new file mode 100644
index 0000000000..f62580b238
--- /dev/null
+++ b/gr-dtv/lib/atsc_derandomizer_impl.cc
@@ -0,0 +1,85 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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_impl.h"
+#include "gnuradio/dtv/atsc_consts.h"
+#include <gnuradio/io_signature.h>
+
+namespace gr {
+  namespace dtv {
+
+    atsc_derandomizer::sptr
+    atsc_derandomizer::make()
+    {
+      return gnuradio::get_initial_sptr
+	(new atsc_derandomizer_impl());
+    }
+
+    atsc_derandomizer_impl::atsc_derandomizer_impl()
+      : gr::sync_block("dtv_atsc_derandomizer",
+                  io_signature::make(1, 1, sizeof(atsc_mpeg_packet_no_sync)),
+                  io_signature::make(1, 1, sizeof(atsc_mpeg_packet)))
+    {
+      reset();
+    }
+
+    void
+    atsc_derandomizer_impl::reset()
+    {
+      d_rand.reset();
+    }
+
+    int
+    atsc_derandomizer_impl::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;
+    }
+
+  } /* namespace dtv */
+} /* namespace gr */