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IDMOQualityControl::SetNow

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Microsoft DirectShow 9.0

IDMOQualityControl::SetNow

The SetNow method specifies the earliest time stamp that the DMO will deliver.

Syntax

  HRESULT SetNow(
    REFERENCE_TIME rtNow
);

Parameters

rtNow

[in] Reference time specifying the earliest time stamp to deliver.

Return Value

Returns an HRESULT value. Possible values include those in the following table.

Return Code Description
E_FAIL Failure
S_OK Success

Remarks

If quality control is enabled, the DMO discards any samples whose time stamp is less than rtNow. Samples whose time stamp is rtNow or later are processed as efficiently as possible. Depending on the implementation, the DMO might drop some samples to keep pace.

If quality control is disabled, this method has no immediate effect. However, the DMO stores the specified reference time. It uses this value if quality control is enabled at a later time. To enable quality control, call the IDMOQualityControl::SetNow method.

If incoming samples are not time-stamped, the DMO never performs quality control. The application sets the time stamp in the IMediaObject::ProcessInput method.

See Also

Requirements

  Header: Declared in Mediaobj.h; include Dmo.h
  Library: Dmoguids.lib.