|Microsoft DirectX 9.0|
The IAMVideoDecimationProperties interface enables an application to control where video decimation occurs. The Overlay Mixer filter implements this interface.
If a video window is smaller than the native size of the video being displayed, the video renderer must decimate the incoming videothat is, scale the video down to the smaller size. Decimation can be performed in one of the following places.
An application can call methods on this interface to select a particular decimation strategy, in order to optimize performance. However, most applications will have no occasion to use this interface. Unless your application is designed to support particular hardware, there is no reason to modify the Overlay Mixer filter's default behavior for decimation.
In addition to the methods inherited from IUnknown, the IAMVideoDecimationProperties interface exposes the following methods.
|QueryDecimationUsage||Retrieves the current decimation strategy.|
|SetDecimationUsage||Sets the decimation strategy.|