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diff --git a/src/engine/EventSource.hpp b/src/engine/EventSource.hpp
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+++ b/src/engine/EventSource.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 EVENTSOURCE_H
+#define EVENTSOURCE_H
+
+#include "types.hpp"
+
+namespace Ingen {
+
+class Event;
+class QueuedEvent;
+class PostProcessor;
+
+
+/** Source for events to run in the audio thread.
+ *
+ * The AudioDriver gets events from an EventSource in the process callback
+ * (realtime audio thread) and executes them, then they are sent to the
+ * PostProcessor and finalised (post-processing thread).
+ *
+ * There are two distinct classes of events - "queued" and "stamped".  Queued
+ * events are events that require non-realtime pre-processing before being
+ * executed in the process thread.  Stamped events are timestamped realtime
+ * events that require no pre-processing and can be executed immediately
+ * (with sample accuracy).
+ */
+class EventSource
+{
+public:
+	virtual ~EventSource() {}
+
+	virtual void activate()   = 0;
+	virtual void deactivate() = 0;
+
+	virtual void process(PostProcessor& dest, ProcessContext& context) = 0;
+
+protected:
+	size_t _capacity;
+};
+
+
+} // namespace Ingen
+
+#endif // EVENTSOURCE_H
+