|Microsoft DirectShow 9.0|
The IQualityControl interface provides support for quality control. An object exposes this interface if it can generate or receive quality-control messages. This includes renderer filters (which typically generate quality control messages), pins (which receive them), and external quality managers (which also receive them).
A renderer filter generates a quality-control message by calling the IQualityControl::Notify method on the output pin of the upstream filter. The upstream filter either handles the message or passes it upstream.
An application can implement its own quality-control manager. Call IQualityControl::SetSink on the renderer to designate the quality-control manager as the recipient for quality-control messages. Calling this method overrides the default handling of quality-control messages.
However, most applications will not implement their own quality-control managers; and aside from this special case, applications typically do not use this interface. For more information, see Quality-Control Management
In addition to the methods inherited from IUnknown, the IQualityControl interface exposes the following methods.
|Notify||Notifies the recipient that a quality change is requested.|
|SetSink||Sets the IQualityControl object that will receive quality messages.|
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.