1 files changed, 84 insertions, 0 deletions
diff --git a/gr-atsc/src/lib/atsc_viterbi_decoder.cc b/gr-atsc/src/lib/atsc_viterbi_decoder.cc
new file mode 100644
index 0000000000..394ee5035f
--- /dev/null
+++ b/gr-atsc/src/lib/atsc_viterbi_decoder.cc
@@ -0,0 +1,84 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2006 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <atsc_viterbi_decoder.h>
+#include <gr_io_signature.h>
+#include <atsc_consts.h>
+#include <iostream.h>
+
+
+atsc_viterbi_decoder_sptr
+atsc_make_viterbi_decoder()
+{
+  return atsc_viterbi_decoder_sptr(new atsc_viterbi_decoder());
+}
+
+atsc_viterbi_decoder::atsc_viterbi_decoder()
+  : gr_sync_block("atsc_viterbi_decoder",
+		  gr_make_io_signature(1, 1, sizeof(atsc_soft_data_segment)),
+		  gr_make_io_signature(1, 1, sizeof(atsc_mpeg_packet_rs_encoded))),
+		  last_start(-1)
+{
+  set_output_multiple(atsci_viterbi_decoder::NCODERS);
+  reset();
+}
+
+int
+atsc_viterbi_decoder::work (int noutput_items,
+		       gr_vector_const_void_star &input_items,
+		       gr_vector_void_star &output_items)
+{
+  const atsc_soft_data_segment *in = (const atsc_soft_data_segment *) input_items[0];
+  atsc_mpeg_packet_rs_encoded *out = (atsc_mpeg_packet_rs_encoded *) output_items[0];
+
+  assert (noutput_items % atsci_viterbi_decoder::NCODERS == 0);
+
+  // find the first mod 12 boundary to begin decoding
+  int start;
+  for (start = 0; start < atsci_viterbi_decoder::NCODERS; start++){
+    assert (in[start].pli.regular_seg_p ());
+    if ((in[start].pli.segno () % atsci_viterbi_decoder::NCODERS) == 0)
+      break;
+  }
+
+  if (start == atsci_viterbi_decoder::NCODERS){
+    // we didn't find a mod 12 boundary.  There's some kind of problem
+    // upstream of us (not yet sync'd??)
+    cerr << "!!!atsc_viterbi_decoder: no mod-12 boundary found\7\n";
+    start = 0;
+  }
+  else if (start != last_start){
+    cerr << "atsc_viterbi_decoder: new starting offset = " << start
+         << endl;
+    last_start = start;
+  }
+
+  for (int i = 0; i < atsci_viterbi_decoder::NCODERS; i += atsci_viterbi_decoder::NCODERS){
+    d_viterbi_decoder.decode(&out[i], &in[i + start]);
+  }
+  return atsci_viterbi_decoder::NCODERS;
+}
+