IDMOQualityControl::SetNow method (mediaobj.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The SetNow method specifies the earliest time stamp that the DMO will deliver.
Syntax
HRESULT SetNow(
[in] REFERENCE_TIME rtNow
);
Parameters
[in] rtNow
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 |
|---|---|
|
Failure |
|
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::SetStatus 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.
Requirements
| Target Platform | Windows |
| Header | mediaobj.h (include Dmo.h) |
| Library | Dmoguids.lib |