Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 97 insertions, 0 deletions

diff --git a/gr-atsc/src/lib/GrAtscSymbolMapper.h b/gr-atsc/src/lib/GrAtscSymbolMapper.h
new file mode 100644
index 000000000..061f4aa72
--- /dev/null
+++ b/gr-atsc/src/lib/GrAtscSymbolMapper.h
@@ -0,0 +1,97 @@
+/* -*- 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.
+ */
+
+#ifndef _GRATSCSYMBOLMAPPER_H_
+#define _GRATSCSYMBOLMAPPER_H_
+
+
+#include <VrInterpolatingSigProcNoWork.h>
+#include <atsc_types.h>
+#include <gr_nco.h>
+
+/*!
+ * \brief take atsc_data_segments and map them to symbols.
+ *
+ * Input is a stream of atsc_data_segments.
+ * Output is a stream of symbols at 1x the symbol rate
+ *
+ * This module performs the signal mapping & pilot addition.
+ */
+
+template<class oType>
+class GrAtscSymbolMapper
+  : public VrInterpolatingSigProcNoWork<atsc_data_segment, oType> {
+
+public:
+  GrAtscSymbolMapper ()
+    : VrInterpolatingSigProcNoWork<atsc_data_segment, oType>(1, INTERP_FACTOR) {};
+
+  ~GrAtscSymbolMapper () {};
+
+  const char *name () { return "GrAtscSymbolMapper"; }
+
+  int work (VrSampleRange output, void *ao[],
+	    VrSampleRange inputs[], void *ai[]);
+
+protected:
+  static const int	INTERP_FACTOR = ATSC_DATA_SEGMENT_LENGTH;
+};
+
+
+template<class oType>
+int 
+GrAtscSymbolMapper<oType>::work (VrSampleRange output, void *ao[],
+				 VrSampleRange inputs[], void *ai[])
+{
+  atsc_data_segment	*in =  ((atsc_data_segment **) ai)[0];
+  oType  		*out = ((oType **) ao)[0];
+  
+  assert ((output.size % INTERP_FACTOR) == 0);
+  
+  static const float pilot_add = 1.25;
+  static const float map[8] = {
+    -7 + pilot_add,
+    -5 + pilot_add,
+    -3 + pilot_add,
+    -1 + pilot_add,
+     1 + pilot_add,
+     3 + pilot_add,
+     5 + pilot_add,
+     7 + pilot_add
+  };
+
+  unsigned int	oo = 0;
+  unsigned int	nsegs = output.size / INTERP_FACTOR;
+
+  for (unsigned int n = 0; n < nsegs; n++){
+    unsigned char *symbol = in[n].data;
+
+    for (int i = 0; i < ATSC_DATA_SEGMENT_LENGTH; i++){
+      out[oo++] = (oType) map[symbol[i] & 0x7];
+    }
+  }
+
+  assert (oo == output.size);
+  return output.size;
+}
+
+#endif /* _GRATSCSYMBOLMAPPER_H_ */