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diff --git a/src/server/DuplexPort.hpp b/src/server/DuplexPort.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_DUPLEXPORT_HPP
+#define INGEN_ENGINE_DUPLEXPORT_HPP
+
+#include "InputPort.hpp"
+#include "PortImpl.hpp"
+#include "PortType.hpp"
+#include "types.hpp"
+
+#include "ingen/URI.hpp"
+#include "lv2/urid/urid.h"
+
+#include <boost/intrusive/slist_hook.hpp>
+
+#include <cstddef>
+#include <cstdint>
+
+namespace Raul { class Symbol; }
+
+namespace ingen {
+
+class Atom;
+class Properties;
+
+namespace server {
+
+class BufferFactory;
+class Engine;
+class GraphImpl;
+class RunContext;
+
+/** A duplex Port (both an input and output port on a Graph)
+ *
+ * This is used for Graph ports, since they need to appear as both an input and
+ * an output port based on context.  There are no actual duplex ports in Ingen,
+ * a Port is either an Input or Output.  This class only exists to allow Graph
+ * outputs to appear as inputs from within that Graph, and vice versa.
+ *
+ * \ingroup engine
+ */
+class DuplexPort : public InputPort
+                 , public boost::intrusive::slist_base_hook<>  // In GraphImpl
+{
+public:
+	DuplexPort(BufferFactory&      bufs,
+	           GraphImpl*          parent,
+	           const Raul::Symbol& symbol,
+	           uint32_t            index,
+	           bool                polyphonic,
+	           PortType            type,
+	           LV2_URID            buf_type,
+	           size_t              buf_size,
+	           const Atom&         value,
+	           bool                is_output);
+
+	virtual ~DuplexPort();
+
+	DuplexPort* duplicate(Engine&             engine,
+	                      const Raul::Symbol& symbol,
+	                      GraphImpl*          parent);
+
+	void inherit_neighbour(const PortImpl* port,
+	                       Properties&     remove,
+	                       Properties&     add) override;
+
+	void on_property(const URI& uri, const Atom& value) override;
+
+	uint32_t max_tail_poly(RunContext& context) const override;
+
+	bool prepare_poly(BufferFactory& bufs, uint32_t poly) override;
+
+	bool apply_poly(RunContext& context, uint32_t poly) override;
+
+	bool get_buffers(BufferFactory&      bufs,
+	                 PortImpl::GetFn     get,
+	                 const MPtr<Voices>& voices,
+	                 uint32_t            poly,
+	                 size_t              num_in_arcs) const override;
+
+	void set_is_driver_port(BufferFactory& bufs) override;
+
+	/** Set the external driver-provided buffer.
+	 *
+	 * This may only be called in the process thread, after an earlier call to
+	 * prepare_driver_buffer().
+	 */
+	void set_driver_buffer(void* buf, uint32_t capacity);
+
+	bool
+	setup_buffers(RunContext& ctx, BufferFactory& bufs, uint32_t poly) override;
+
+	void pre_process(RunContext& context) override;
+	void post_process(RunContext& context) override;
+
+	SampleCount
+	next_value_offset(SampleCount offset, SampleCount end) const override;
+};
+
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_ENGINE_DUPLEXPORT_HPP