| Microsoft DirectX 8.1 (C++) |
This topic applies to Windows XP Home Edition and Windows XP Professional only.
The IVMRMixerControl interface is exposed on the VMR filter and contains methods that applications use to manipulate the incoming video streams in various ways. Although this interface is implemented on the filter, it is actually the mixer component that is being configured. For this reason, this interface is only available when the mixer has been loaded through a call to IVMRFilterConfig::SetNumberOfStreams. This interface is intended for use by applications only; it should not be used by upstream filters.
In addition to the methods inherited from IUnknown, the IVMRMixerControl interface exposes the following methods:
| Method | Description |
| GetAlpha | Retrieves the constant alpha value that is applie to this video stream. |
| GetBackgroundClr | Retrieves the background color of the output rectangle. |
| GetMixingPrefs | Retrieves the mixing preferences for the stream. |
| GetOutputRect | Retrieves the position of this stream's video rectangle within the composition rectangle. |
| GetZOrder | Retrieves this video stream's position in the Z order. |
| SetAlpha | Sets a constant alpha value that is applied to this video stream. |
| SetBackgroundClr | Sets the background color of the output rectangle. |
| SetMixingPrefs | Sets the mixing preferences for the stream. |
| SetOutputRect | Sets the position of this stream within the composition rectangle. |
| SetZOrder | Sets this video stream's position in the Z-order. |