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diff --git a/gr-comedi/include/gnuradio/comedi/source_s.h b/gr-comedi/include/gnuradio/comedi/source_s.h
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+++ b/gr-comedi/include/gnuradio/comedi/source_s.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2012 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_COMEDI_SOURCE_S_H
+#define INCLUDED_COMEDI_SOURCE_S_H
+
+#include <gnuradio/comedi/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+  namespace comedi {
+    
+    /*!
+     * \brief source using COMEDI
+     *
+     * The source has one to many input stream of signed short integers.
+     *
+     * Output samples will be in the range [-32768,32767].
+     */
+    class COMEDI_API source_s : virtual public sync_block
+    {
+    public:
+      // gr::comedi::source_s::sptr
+      typedef boost::shared_ptr<source_s> sptr;
+
+      /*!
+       * \brief make a COMEDI source.
+       *
+       * \param sampling_freq sampling rate in Hz
+       * \param dev COMEDI device name, e.g., "/dev/comedi0"
+       */
+      static sptr make(int sampling_freq,
+		       const std::string dev = "/dev/comedi0");
+    };
+
+  } /* namespace comedi */
+} /* namespace gr */
+
+#endif /* INCLUDED_COMEDI_SOURCE_S_H */