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diff --git a/libs/ardour/ardour/midi_util.h b/libs/ardour/ardour/midi_util.h
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+++ b/libs/ardour/ardour/midi_util.h
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+/*
+    Copyright (C) 2006 Paul Davis
+	Written by Dave Robillard, 2006
+
+    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 __ardour_midi_util_h__ 
+#define __ardour_midi_util_h__
+
+#include <midi++/events.h>
+
+namespace ARDOUR {
+
+/** Return the size of the given event NOT including the status byte,
+ * or -1 if unknown (eg sysex)
+ */
+static inline int
+midi_event_size(unsigned char status)
+{
+	// if we have a channel event
+	if (status >= 0x80 && status < 0xF0) {
+		status &= 0xF0; // mask off the channel
+	}
+
+	switch (status) {
+		case MIDI_CMD_NOTE_OFF:
+		case MIDI_CMD_NOTE_ON:
+		case MIDI_CMD_NOTE_PRESSURE:
+		case MIDI_CMD_CONTROL:
+		case MIDI_CMD_BENDER:
+		case MIDI_CMD_COMMON_SONG_POS:
+			return 2;
+
+		case MIDI_CMD_PGM_CHANGE:
+		case MIDI_CMD_CHANNEL_PRESSURE:
+		case MIDI_CMD_COMMON_MTC_QUARTER:
+		case MIDI_CMD_COMMON_SONG_SELECT:
+			return 1;
+
+		case MIDI_CMD_COMMON_TUNE_REQUEST:
+		case MIDI_CMD_COMMON_SYSEX_END:
+		case MIDI_CMD_COMMON_CLOCK:
+		case MIDI_CMD_COMMON_START:
+		case MIDI_CMD_COMMON_CONTINUE:
+		case MIDI_CMD_COMMON_STOP:
+		case MIDI_CMD_COMMON_SENSING:
+		case MIDI_CMD_COMMON_RESET:
+			return 0;
+		
+		case MIDI_CMD_COMMON_SYSEX:
+			return -1;
+	}
+
+	return -1;
+}
+
+} // namespace ARDOUR
+
+#endif /* __ardour_midi_util_h__ */