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diff --git a/src/engine/InputPort.hpp b/src/engine/InputPort.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 INPUTPORT_H
+#define INPUTPORT_H
+
+#include <string>
+#include <cstdlib>
+#include <cassert>
+#include <raul/List.hpp>
+#include <raul/SharedPtr.hpp>
+#include "PortImpl.hpp"
+using std::string;
+
+namespace Ingen {
+
+class ConnectionImpl;
+class OutputPort;
+class NodeImpl;
+
+
+/** An input port on a Node or Patch.
+ *
+ * All ports have a Buffer, but the actual contents (data) of that buffer may be
+ * set directly to the incoming connection's buffer if there's only one inbound
+ * connection, to eliminate the need to copy/mix.
+ *
+ * If a port has multiple connections, they will be mixed down into the local
+ * buffer and it will be used.
+ *
+ * \ingroup engine
+ */
+class InputPort : virtual public PortImpl
+{
+public:
+	InputPort(NodeImpl*     parent,
+	          const string& name,
+	          uint32_t      index,
+	          uint32_t      poly,
+	          DataType      type,
+	          const Atom&   value,
+	          size_t        buffer_size);
+
+	virtual ~InputPort() {}
+	
+	typedef Raul::List< SharedPtr<ConnectionImpl> > Connections;
+	
+	void               add_connection(Connections::Node* c);
+	Connections::Node* remove_connection(const OutputPort* src_port);
+
+	const Connections& connections() { return _connections; }
+	
+	bool prepare_poly(uint32_t poly);
+	bool apply_poly(Raul::Maid& maid, uint32_t poly);
+
+	void pre_process(ProcessContext& context);
+	void post_process(ProcessContext& context);
+	
+	bool is_connected() const { return (_connections.size() > 0); }
+	//bool is_connected_to(const OutputPort* port) const;
+	
+	bool is_input()  const { return true; }
+	bool is_output() const { return false; }
+	
+	virtual void set_buffer_size(size_t size);
+	
+private:
+	Connections _connections;
+};
+
+
+} // namespace Ingen
+
+#endif // INPUTPORT_H