1 files changed, 101 insertions, 0 deletions
diff --git a/gr-atsc/src/lib/GrAtscFieldSyncChecker.cc b/gr-atsc/src/lib/GrAtscFieldSyncChecker.cc
new file mode 100644
index 000000000..18b81ac20
--- /dev/null
+++ b/gr-atsc/src/lib/GrAtscFieldSyncChecker.cc
@@ -0,0 +1,101 @@
+/* -*- 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 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.
+ */
+
+#include <GrAtscFieldSyncChecker.h>
+#include <create_atsci_fs_checker.h>
+#include <atsci_fs_checker.h>
+
+// typedefs for fundamental i/o types
+
+typedef float		iDataType;
+typedef atsc::syminfo	iTagType;
+typedef float		oDataType;
+typedef atsc::syminfo	oTagType;
+
+static const int NUMBER_OF_OUTPUTS = 2;	// # of output streams 
+
+
+GrAtscFieldSyncChecker::GrAtscFieldSyncChecker ()
+  : VrHistoryProc<iDataType,oDataType> (NUMBER_OF_OUTPUTS)
+{
+  // tags and data must be same size due to limitation of runtime
+  assert (sizeof (iDataType) == sizeof (iTagType));
+  assert (sizeof (oDataType) == sizeof (oTagType));
+
+  // 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;	
+
+  d_fsc = create_atsci_fs_checker ();
+}
+
+GrAtscFieldSyncChecker::~GrAtscFieldSyncChecker ()
+{
+  // Anything that isn't automatically cleaned up...
+
+  delete d_fsc;
+}
+
+/*
+ * 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 
+GrAtscFieldSyncChecker::work (VrSampleRange output, void *ao[],
+			      VrSampleRange inputs[], void *ai[])
+{
+  // If we have state that persists across invocations (e.g., we have
+  // instance variables that we modify), we must use the sync method
+  // to indicate to the scheduler that our output must be computed in
+  // order.  This doesn't keep other things from being run in
+  // parallel, it just means that at any given time, there is only a
+  // single thread working this code, and that the scheduler will
+  // ensure that we are asked to produce output that is contiguous and
+  // that will be presented to us in order of increasing time.
+
+  // We have state, hence we must use sync.
+
+  sync (output.index);
+
+  // construct some nicer i/o pointers to work with.
+
+  iDataType *sample_in  = ((iDataType **) ai)[0];
+  iTagType  *tag_in     = ((iTagType **)  ai)[1];
+  oDataType *sample_out = ((oDataType **) ao)[0];
+  oTagType  *tag_out    = ((oTagType **)  ao)[1];
+
+  // We must produce output.size units of output.
+
+  for (unsigned int i = 0; i < output.size; i++){
+    d_fsc->filter (sample_in[i], tag_in[i], &sample_out[i], &tag_out[i]);
+  }
+
+  // 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;
+}