If you are writing an AVStream minidriver, refer to AVStream Clocks.
A user-mode client can request to be notified when a clock reaches a certain time stamp, or to receive periodic notification that a fixed amount of time on the clock has elapsed. To do so, clients register KSEVENT_CLOCK_POSITION_MARK and KSEVENT_CLOCK_INTERVAL_MARK.
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Build date: 1/22/2014