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IMFVideoMixerBitmap interface

Alpha-blends a static bitmap image with the video displayed by the Enhanced Video Renderer (EVR).

The EVR mixer implements this interface. To get a pointer to the interface, call IMFGetService::GetService. The service identifier GUID is MR_VIDEO_MIXER_SERVICE. Call GetService on any of the following objects:

  • The Media Session, if the topology contains an instance of the EVR.
  • The EVR media sink.
  • The DirectShow EVR filter.
  • The EVR mixer.

If you implement a custom mixer for the EVR, the mixer can optionally expose this interface as a service.

Members

The IMFVideoMixerBitmap interface inherits from the IUnknown interface. IMFVideoMixerBitmap also has these types of members:

Methods

The IMFVideoMixerBitmap interface has these methods.

MethodDescription
ClearAlphaBitmap

Removes the current bitmap and releases any resources associated with it.

GetAlphaBitmapParameters

Retrieves the current settings that the EVR uses to alpha-blend the bitmap with the video.

SetAlphaBitmap

Sets a bitmap image for the EVR to alpha-blend with the video.

UpdateAlphaBitmapParameters

Updates the current alpha-blending settings.

 

Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Evr9.h

Library

Strmiids.lib

See also

Media Foundation Interfaces
Enhanced Video Renderer

 

 

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