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diff --git a/src/server/InputPort.hpp b/src/server/InputPort.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_INPUTPORT_HPP
+#define INGEN_ENGINE_INPUTPORT_HPP
+
+#include <cassert>
+#include <cstdlib>
+
+#include <boost/intrusive/slist.hpp>
+
+#include "ingen/types.hpp"
+
+#include "ArcImpl.hpp"
+#include "PortImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class ArcImpl;
+class BlockImpl;
+class RunContext;
+
+/** An input port on a Block or Graph.
+ *
+ * All ports have a Buffer, but the actual contents (data) of that buffer may be
+ * set directly to the incoming arc's buffer if there's only one inbound
+ * arc, to eliminate the need to copy/mix.
+ *
+ * If a port has multiple arcs, they will be mixed down into the local
+ * buffer and it will be used.
+ *
+ * \ingroup engine
+ */
+class InputPort : public PortImpl
+{
+public:
+	InputPort(BufferFactory&      bufs,
+	          BlockImpl*          parent,
+	          const Raul::Symbol& symbol,
+	          uint32_t            index,
+	          uint32_t            poly,
+	          PortType            type,
+	          LV2_URID            buffer_type,
+	          const Atom&         value,
+	          size_t              buffer_size = 0);
+
+	typedef boost::intrusive::slist<ArcImpl,
+	                                boost::intrusive::constant_time_size<true>
+	                                > Arcs;
+
+	/** Return the maximum polyphony of an output connected to this input. */
+	virtual uint32_t max_tail_poly(RunContext& context) const;
+
+	bool apply_poly(RunContext& context, uint32_t poly);
+
+	/** Add an arc.  Realtime safe.
+	 *
+	 * The buffer of this port will be set directly to the arc's buffer
+	 * if there is only one arc, since no copying/mixing needs to take place.
+	 *
+	 * setup_buffers() must be called later for the change to take effect.
+	 */
+	void add_arc(RunContext& context, ArcImpl& c);
+
+	/** Remove an arc.  Realtime safe.
+	 *
+	 * setup_buffers() must be called later for the change to take effect.
+	 */
+	void remove_arc(ArcImpl& arc);
+
+	/** Like `get_buffers`, but for the pre-process thread.
+	 *
+	 * This uses the "current" number of arcs fromthe perspective of the
+	 * pre-process thread to allocate buffers for application of a
+	 * connection/disconnection/etc in the next process cycle.
+	 */
+	bool pre_get_buffers(BufferFactory& bufs,
+	                     MPtr<Voices>&  voices,
+	                     uint32_t       poly) const;
+
+	bool setup_buffers(RunContext& ctx, BufferFactory& bufs, uint32_t poly);
+
+	/** Set up buffer pointers. */
+	void pre_process(RunContext& context);
+
+	/** Prepare buffer for access, mixing if necessary. */
+	void pre_run(RunContext& context);
+
+	/** Prepare buffer for next process cycle. */
+	void post_process(RunContext& context);
+
+	SampleCount next_value_offset(SampleCount offset, SampleCount end) const;
+
+	size_t num_arcs() const     { return _num_arcs; }
+	void   increment_num_arcs() { ++_num_arcs; }
+	void   decrement_num_arcs() { --_num_arcs; }
+
+	bool direct_connect() const;
+
+protected:
+	bool get_buffers(BufferFactory&      bufs,
+	                 PortImpl::GetFn     get,
+	                 const MPtr<Voices>& voices,
+	                 uint32_t            poly,
+	                 size_t              num_in_arcs) const;
+
+	size_t _num_arcs;  ///< Pre-process thread
+	Arcs   _arcs;      ///< Audio thread
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_INPUTPORT_HPP