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diff --git a/src/libs/engine/Ingen.h b/src/libs/engine/Ingen.h
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+/* This file is part of Ingen.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * 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 OMAPP_H
+#define OMAPP_H
+
+#include <cassert>
+
+template<typename T> class Queue;
+class Maid;
+
+namespace Om {
+
+class AudioDriver;
+class MidiDriver;
+class NodeFactory;
+class OSCReceiver;
+class ClientBroadcaster;
+class Patch;
+class ObjectStore;
+class EventSource;
+class PostProcessor;
+class Event;
+class QueuedEvent;
+class LashDriver;
+template <typename T> class Driver;
+
+
+/** The main class for Om, the whole app lives in here
+ *
+ * A singleton, but shouldn't be (FIXME).  Explicitly instantiated singleton
+ * to be exact - call instantiate before instance or suffer horrible death.
+ *
+ * \ingroup engine
+ */
+class Ingen
+{
+public:
+	~Ingen();
+
+	static void   instantiate(const char* port, AudioDriver* audio_driver = 0);
+	static Ingen& instance() { assert(m_instance); return *m_instance; }
+	
+	int main();
+	
+	/** Set the quit flag that should kill all threads and exit cleanly.
+	 * Note that it will take some time. */
+	void quit() { m_quit_flag = true; }
+	
+	void activate();
+	void deactivate();
+
+	AudioDriver*       audio_driver()       const { return m_audio_driver; }
+	OSCReceiver*       osc_receiver()       const { return m_osc_receiver; }
+	MidiDriver*        midi_driver()        const { return m_midi_driver; }
+	PostProcessor*     post_processor()     const { return m_post_processor; }
+	Maid*              maid()               const { return m_maid; }
+	ClientBroadcaster* client_broadcaster() const { return m_client_broadcaster; }
+	ObjectStore*       object_store()       const { return m_object_store; }
+	NodeFactory*       node_factory()       const { return m_node_factory; }
+	LashDriver*        lash_driver()        const { return m_lash_driver; }
+
+
+	/** Return the active driver for the given (template parameter) type.
+	 * This is a hook for BridgeNode.  See Ingen.cpp for specializations. */
+	template<typename T> Driver<T>* driver();
+	
+private:
+	Ingen(const char* port, AudioDriver* audio_driver = 0);
+
+	// Prevent copies
+	Ingen(const Ingen&);
+	Ingen& operator=(const Ingen&);
+
+	static Ingen*      m_instance;
+
+	AudioDriver*       m_audio_driver;
+	OSCReceiver*       m_osc_receiver;
+	MidiDriver*        m_midi_driver;
+	PostProcessor*     m_post_processor;
+	Maid*              m_maid;
+	ClientBroadcaster* m_client_broadcaster;
+	ObjectStore*       m_object_store;
+	NodeFactory*       m_node_factory;
+	LashDriver*        m_lash_driver;
+	
+	bool m_quit_flag;
+	bool m_activated;
+};
+
+
+} // namespace Om
+
+#endif // OMAPP_H