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diff --git a/src/engine/RaulJackDriver.hpp b/src/engine/RaulJackDriver.hpp
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+/* This file is part of Raul.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Raul 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.
+ * 
+ * Raul 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 RAUL_JACK_DRIVER_HPP
+#define RAUL_JACK_DRIVER_HPP
+
+#include <iostream>
+#include <string>
+#include <jack/jack.h>
+#include <jack/statistics.h>
+
+namespace Raul {
+
+
+/** Jack based driver for an audio context.
+ *
+ * Apps can override the  on_* methods of this class to implement reactions
+ * to Jack events (e.g. new port, process callback, etc).
+ */
+class JackDriver
+{
+public:
+	JackDriver();
+	virtual ~JackDriver();
+	
+	void attach(const std::string& client_name, std::string server_name="");
+	void detach();
+
+	void activate();
+	void deactivate();
+
+	bool is_activated() const { return _is_activated; }
+	bool is_attached()  const { return (_client != NULL); }
+	bool is_realtime()  const { return _client && jack_is_realtime(_client); }
+	
+	void start_transport() { jack_transport_start(_client); }
+	void stop_transport()  { jack_transport_stop(_client); }
+	
+	void rewind_transport() {
+		jack_position_t zero;
+		zero.frame = 0;
+		zero.valid = (jack_position_bits_t)0;
+		jack_transport_reposition(_client, &zero);
+	}
+	
+	jack_nframes_t buffer_size();
+	bool           set_buffer_size(jack_nframes_t size);
+
+	inline jack_nframes_t sample_rate() { return jack_get_sample_rate(_client); }
+
+	inline size_t xruns() { return _xruns; }
+	void          reset_xruns();
+
+	inline float max_delay()   { return jack_get_max_delayed_usecs(_client); }
+	inline void  reset_delay() { jack_reset_max_delayed_usecs(_client); }
+
+	jack_client_t* jack_client() { return _client; }
+
+
+protected:
+	/** Process callback.  Derived classes should do all audio processing here. */
+	virtual void on_process(jack_nframes_t /*nframes*/) {}
+
+	/** Graph order change callback. */
+	virtual void on_graph_order_changed() {}
+
+	/** Buffer size changed callback.
+	 * At the time this is called, buffer_size() will still return the old
+	 * size.  Immediately afterwards, it will be set to the new value.
+	 */
+	virtual void on_buffer_size_changed(jack_nframes_t /*size*/) {}
+
+	virtual void on_xrun()     {}
+	virtual void on_shutdown() {}
+	virtual void on_error()    {}
+
+protected:
+	jack_client_t* _client;
+
+private:
+
+	static void error_cb(const char* msg);
+
+	void destroy_all_ports();
+
+	void update_time();
+
+	static void jack_port_registration_cb(jack_port_id_t port_id, int registered, void* me);
+	static int  jack_graph_order_cb(void* me);
+	static int  jack_xrun_cb(void* me);
+	static int  jack_buffer_size_cb(jack_nframes_t buffer_size, void* me);
+	static int  jack_process_cb(jack_nframes_t nframes, void* me);
+
+	static void jack_shutdown_cb(void* me);
+
+	bool            _is_activated;
+	jack_position_t _last_pos;
+	jack_nframes_t  _buffer_size;
+	size_t          _xruns;
+	float           _xrun_delay;
+};
+
+
+} // namespace Raul
+
+#endif // RAUL_JACK_DRIVER_HPP