AVStream filters support clocks on pins.
To make clock requests, use the methods defined on the IKsReferenceClock interface. You can acquire an IKsReferenceClock interface by calling KsPinGetReferenceClockInterface. The AVStream minidriver is responsible for releasing the interface when finished.
Note that the clock never appears in GraphEdit, even if the clock has been selected.
To verify that the clock has been selected, verify that calls to IKsReferenceClock methods generate calls to dispatch routines specified in KSCLOCK_DISPATCH.
The filter graph manager selects a clock when a graph transitions into the pause state. Any filter that is a push source, for instance a capture filter, is given preference as a clock provider.