#ifndef _TIMEBASE_H
#define _TIMEBASE_H 1
+#include <ratio>
+
// Common timebase that allows us to represent one frame exactly in all the
// relevant frame rates:
//
// but can do at least 50 and 60 precisely, and months of streaming.
#define COARSE_TIMEBASE 300
+using TimebaseRatio = std::ratio<1, TIMEBASE>;
+
#endif // !defined(_TIMEBASE_H)