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diff --git a/src/libs/engine/OutputPort.hpp b/src/libs/engine/OutputPort.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef OUTPUTPORT_H
+#define OUTPUTPORT_H
+
+#include <string>
+#include <cstdlib>
+#include "Port.hpp"
+#include "types.hpp"
+
+namespace Ingen {
+
+
+/** An output port.
+ *
+ * Output ports always have a locally allocated buffer, and buffer() will
+ * always return that buffer.  (This is very different from InputPort)
+ *
+ * This class actually adds no functionality to Port whatsoever right now,
+ * it will in the future when more advanced port types exist, and it makes
+ * things clearer throughout the engine.
+ *
+ * \ingroup engine
+ */
+class OutputPort : virtual public Port
+{
+public:
+	OutputPort(Node*         parent,
+	           const string& name,
+	           size_t        index,
+	           size_t        poly,
+	           DataType      type,
+	           size_t        buffer_size)
+	: Port(parent, name, index, poly, type, buffer_size)
+	{}
+
+	void pre_process(SampleCount nframes, FrameTime start, FrameTime end);
+	void post_process(SampleCount nframes, FrameTime start, FrameTime end);
+	
+	virtual ~OutputPort() {}
+
+	bool is_input()  const { return false; }
+	bool is_output() const { return true; }
+};
+
+
+} // namespace Ingen
+
+#endif // OUTPUTPORT_H