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IQualProp Interface

Windows Mobile 6.5
A version of this page is also available for
4/8/2010

This interface is exposed by renderers, typically a video renderer, to return information about the performance achieved; for example, the number of frames per second (fps).

The values returned through the interface are reset each time the filter is run.

The base classes of the DirectShow SDK have a standard property page that displays the information available from this interface.

The IQualProp interface is implemented by the DirectShow video renderer.

Other video renderers might want to implement this interface as well, although it is optional.

Applications use this interface to retrieve video renderer performance information.

The following table shows the methods that appear in the Vtable beneath the standard COM methods inherited from IUnknown.

Method Description

get_AvgFrameRate

Retrieves the average frame rate achieved.

get_AvgSyncOffset

Retrieves the average time difference between when a frame was due for rendering and when rendering began (this is returned as a value in milliseconds).

get_DevSyncOffset

Retrieves the average time difference between when a frame was due for rendering and when rendering began (this is returned as a standard deviation).

get_FramesDrawn

Retrieves the number of frames drawn since streaming started.

get_FramesDroppedInRenderer

Retrieves the number of frames dropped by the renderer.

get_Jitter

Expresses the average time between successive frames delivered to the video renderer.

Windows Embedded CEWindows CE 2.12 and later
Windows MobilePocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later
NoteMicrosoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment

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