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diff --git a/libs/midi++2/midi++/port_base.h b/libs/midi++2/midi++/port_base.h
new file mode 100644
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+++ b/libs/midi++2/midi++/port_base.h
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+/*
+    Copyright (C) 1998-2010 Paul Barton-Davis 
+    This program 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.
+
+    This program 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 this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef  __libmidi_port_base_h__
+#define  __libmidi_port_base_h__
+
+#include <string>
+#include <iostream>
+
+#include <jack/types.h>
+
+#include "pbd/xml++.h"
+#include "pbd/crossthread.h"
+#include "pbd/signals.h"
+#include "pbd/ringbuffer.h"
+
+#include "evoral/Event.hpp"
+#include "evoral/EventRingBuffer.hpp"
+
+#include "midi++/types.h"
+#include "midi++/parser.h"
+
+namespace MIDI {
+
+class Channel;
+class PortRequest;
+
+class PortBase {
+  public:
+	enum Flags {
+		IsInput = JackPortIsInput,
+		IsOutput = JackPortIsOutput,
+	};
+	
+	PortBase (std::string const &, Flags);
+	PortBase (const XMLNode&);
+	virtual ~PortBase ();
+
+	XMLNode& get_state () const;
+	void set_state (const XMLNode&);
+
+	// FIXME: make Manager a friend of port so these can be hidden?
+
+	/* Only for use by MidiManager.  Don't ever call this. */
+	virtual void cycle_start (pframes_t nframes) {}
+	/* Only for use by MidiManager.  Don't ever call this. */
+	virtual void cycle_end () {}
+
+	/** Write a message to port.
+	 * @param msg Raw MIDI message to send
+	 * @param msglen Size of @a msg
+	 * @param timestamp Time stamp in frames of this message (relative to cycle start)
+	 * @return number of bytes successfully written
+	 */
+	virtual int write (byte *msg, size_t msglen, timestamp_t timestamp) = 0;
+
+	/** Read raw bytes from a port.
+	 * @param buf memory to store read data in
+	 * @param bufsize size of @a buf
+	 * @return number of bytes successfully read, negative if error
+	 */
+	virtual int read (byte *buf, size_t bufsize) = 0;
+
+	/** block until the output FIFO used by non-process threads
+	 * is empty, checking every @a check_interval_usecs usecs
+	 * for current status. Not to be called by a thread that
+	 * executes any part of a JACK process callback (will 
+	 * simply return immediately in that situation).
+	 */
+	virtual void drain (int check_interval_usecs) {}
+
+	/** Write a message to port.
+	 * @return true on success.
+	 * FIXME: describe semantics here
+	 */
+	int midimsg (byte *msg, size_t len, timestamp_t timestamp) {
+		return !(write (msg, len, timestamp) == (int) len);
+	} 
+
+	bool clock (timestamp_t timestamp);
+
+	/* select(2)/poll(2)-based I/O */
+
+	/** Get the file descriptor for port.
+	 * @return File descriptor, or -1 if not selectable. 
+	 */
+	virtual int selectable () const = 0;
+
+	Channel *channel (channel_t chn) { 
+		return _channel[chn&0x7F];
+	}
+	
+	Parser* parser () {
+		return _parser;
+	}
+	
+	const char *name () const   { return _tagname.c_str(); }
+	bool   ok ()   const        { return _ok; }
+
+	virtual bool centrally_parsed() const;
+	void set_centrally_parsed (bool yn) { _centrally_parsed = yn; }
+
+	bool receives_input () const {
+		return _flags == IsInput;
+	}
+
+	bool sends_output () const {
+		return _flags == IsOutput;
+	}
+
+	struct Descriptor {
+	    std::string tag;
+	    Flags flags;
+
+	    Descriptor (const XMLNode&);
+	    XMLNode& get_state();
+	};
+
+	static std::string state_node_name;
+
+  protected:
+	bool              _ok;
+	std::string       _tagname;
+	Channel*          _channel[16];
+	Parser*           _parser;
+	Flags             _flags;
+	bool              _centrally_parsed;
+
+	virtual void init (std::string const &, Flags);
+};
+
+struct PortSet {
+    PortSet (std::string str) : owner (str) { }
+    
+    std::string owner;
+    std::list<XMLNode> ports;
+};
+
+std::ostream & operator << (std::ostream& os, const PortBase& port);
+
+} // namespace MIDI
+
+#endif // __libmidi_port_base_h__