IDDrawExclModeVideoCallback interface

The IDDrawExclModeVideoCallback interface is a callback interface for the IDDrawExclModeVideo interface.

This callback interface enables applications to get synchronous notification about changes to the overlay position, size, visibility, and so on, so that the application can adjust its video visibility, size, and position. This avoids any color key flash at the beginning, end, or during playback. The application must implement the interface. It is important that none of the methods block or slow down the video processing, because this will cause problems with playback.

Use this interface if you are writing a filter that supports IDDrawExclModeVideo or needs to generate callbacks to enable an application to draw color keys at the right time.

Members

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

Methods

The IDDrawExclModeVideoCallback interface has these methods.

MethodDescription
OnUpdateColorKey

Informs the application that the color key has changed so that the application can use the new color key to overlay graphics on the video.

OnUpdateOverlay

Informs the application when the overlay surface for the video is about to change.

OnUpdateSize

Informs the application when the size of the video rectangle is about to change.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Strmif.h (include Dshow.h)

Library

Strmiids.lib

 

 

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