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diff --git a/gr-msdd6000/src/msdd_source_s.h b/gr-msdd6000/src/msdd_source_s.h
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+++ b/gr-msdd6000/src/msdd_source_s.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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.
+ */
+
+#ifndef INCLUDED_MSDD_SOURCE_S_H
+#define INCLUDED_MSDD_SOURCE_S_H
+
+#include <msdd_source_base.h>
+#include <stdexcept>
+#include <msdd_buffer_copy_behaviors.h>
+
+class usrp_standard_rx;
+
+
+class msdd_source_s;
+typedef boost::shared_ptr<msdd_source_s> msdd_source_s_sptr;
+
+
+// public shared_ptr constructor
+
+msdd_source_s_sptr
+msdd_make_source_s (int which_board, 
+		     unsigned int decim_rate,
+		     unsigned int fft_points,
+		     double initial_rx_freq,
+		     int opp_mode,
+		     const char *src, 
+		     unsigned short port_src
+		     ) throw (std::runtime_error);
+
+/*!
+ * \brief interface to MSDD Rx path
+ *
+ * output: 1 stream of short
+ */
+class msdd_source_s : public msdd_source_base {
+ private:
+  friend msdd_source_s_sptr
+  msdd_make_source_s (int which_board, 
+		       unsigned int decim_rate,
+		       unsigned int fft_points,
+		       double initial_rx_freq,
+		       int opp_mode,
+               const char *src, 
+               unsigned short port_src
+		       ) throw (std::runtime_error);
+
+  std::auto_ptr<msdd::BufferCopyBehavior> d_buffer_copy_behavior;
+  
+ protected:
+  msdd_source_s (int which_board, 
+		  unsigned int decim_rate,
+		  unsigned int fft_points,
+		  double initial_rx_freq,
+		  int opp_mode,
+          const char *src, 
+          unsigned short port_src
+		  ) throw (std::runtime_error);
+
+  int ninput_bytes_reqd_for_noutput_items (int noutput_items);
+
+  virtual void copy_from_msdd_buffer (gr_vector_void_star &output_items,
+				      int output_index,
+				      int output_items_available,
+				      int &output_items_produced,
+				      const void *msdd_buffer,
+				      int buffer_length,
+				      int &bytes_read);
+ public:
+  ~msdd_source_s ();
+};
+
+#endif /* INCLUDED_MSDD_SOURCE_S_H */