+extern void start_batch_converter (boost::filesystem::path dcpomatic);
+extern void start_player (boost::filesystem::path dcpomatic);
+extern uint64_t thread_id ();
+extern int avio_open_boost (AVIOContext** s, boost::filesystem::path file, int flags);
+
+/** @class Waker
+ * @brief A class which tries to keep the computer awake on various operating systems.
+ *
+ * Create a Waker to prevent sleep, and call nudge() every so often (every minute or so).
+ * Destroy the Waker to allow sleep again.
+ */
+class Waker
+{
+public:
+ Waker ();
+ ~Waker ();
+
+ void nudge ();
+
+private:
+#ifdef DCPOMATIC_OSX
+ IOPMAssertionID _assertion_id;
+#endif
+};
+
+#endif