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Determines if the beginning of a sample is a synchronization point.
HRESULT IsSyncPoint(void);
Return Values
Returns S_OK if the sample is a synchronization point and S_FALSE if not; otherwise, returns an HRESULTerror value.
Remarks
If the bTemporalCompressionmember of the AM_MEDIA_TYPEstructure is FALSE, all samples are synchronization points. A filter can begin a stream at any synchronization point.
While calling SetSyncPointwith a value of TRUE (1) sets the synchronization point, calling IsSyncPointon a synchronization point sample returns S_OK (0).