Merge branch 'dfsg-orig'

[debian/gnuradio] / gr-atsc / src / lib / GrAtscRSDecoder.cc

diff --git a/gr-atsc/src/lib/GrAtscRSDecoder.cc b/gr-atsc/src/lib/GrAtscRSDecoder.cc
new file mode 100644 (file)
index 0000000..c9092a2
--- /dev/null
+++ b/gr-atsc/src/lib/GrAtscRSDecoder.cc
@@ -0,0 +1,81 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2002 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.
+ */
+
+#include <GrAtscRSDecoder.h>
+
+// typedefs for fundamental i/o types
+
+typedef atsc_mpeg_packet_rs_encoded    iType;
+typedef atsc_mpeg_packet_no_sync       oType;
+
+static const int NUMBER_OF_OUTPUTS = 1;        // # of output streams (almost always one)
+
+
+GrAtscRSDecoder::GrAtscRSDecoder ()
+  : VrHistoryProc<iType,oType> (NUMBER_OF_OUTPUTS)
+{
+  // 1 + number of extra input elements at which we look.  This is
+  // used by the superclass's forecast routine to get us the correct
+  // range on our inputs.
+  // We're one-to-one input-to-output so set it to 1.
+  history = 1; 
+
+  // any other init here.
+}
+
+GrAtscRSDecoder::~GrAtscRSDecoder ()
+{
+  // Anything that isn't automatically cleaned up...
+}
+
+/*
+ * This is the real work horse.  In general this interface can handle
+ * multiple streams of input and output, but we almost always
+ * use a single input and output stream.
+ */
+
+int 
+GrAtscRSDecoder::work (VrSampleRange output, void *ao[],
+                         VrSampleRange inputs[], void *ai[])
+{
+  // construct some nicer i/o pointers to work with.
+
+  iType *in  = ((iType **) ai)[0];
+  oType *out = ((oType **) ao)[0];
+
+
+  // We must produce output.size units of output.
+
+  for (unsigned int i = 0; i < output.size; i++){
+    assert (in[i].pli.regular_seg_p ());
+    out[i].pli = in[i].pli;            // copy pipeline info
+
+    int nerrors_not_corrected = rs_decoder.decode (out[i], in[i]);
+    out[i].pli.set_transport_error (nerrors_not_corrected == -1);
+  }
+
+  // Return the number of units we produced.
+  // Note that for all intents and purposes, it is an error to
+  // produce less than you are asked for.
+
+  return output.size;  
+}