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IQualProp Interface

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Microsoft DirectShow 9.0

IQualProp Interface

The IQualProp interface provides methods for retrieving performance information from video renderers. The values returned through the interface are reset each time the filter is stopped. The Video Renderer filter and the Full Screen Renderer filter expose this interface.

Applications can use this interface to retrieve video performance information.

In addition to the methods inherited from IUnknown, the IQualProp interface exposes the following methods.

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 actually 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 actually 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.

Requirements

Header: Declared in Amvideo.h; include Dshow.h.

Library: Use Strmiids.lib.