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Microsoft DirectShow implements full-screen support in a number of ways that depend on what hardware resources are available. An application can support full-screen video playback through the IVideoWindowinterface provided by the filter graph manager. An application can have its own implementation of full-screen playback, but it can probably make better use of resources by using the IVideoWindowimplementation.
The IVideoWindowplug-in distributor (PID) tries three different options for implementing full-screen support when an application requests full-screen mode. The option is typically chosen the first time the filter graph enters full-screen mode. While in full-screen mode, no IVideoWindowmethods can be called (apart from accessing the full-screen property). Any attempts to do so will return the VFW_E_IN_FULLSCREEN_MODEmessage. The PID searches in the following order for a filter that supports IVideoWindowand that has one of these characteristics:
- The filter supplies full-screen mode directly.
- The filter allows its window to be stretched to full screen without penalty.
- The filter can be replaced by a full-screen renderer.
If none of these three options are found, the default is to simply stretch the video of a filter that supports IVideoWindowto full-screen, ignoring the performance penalties.
Last updated on Tuesday, May 18, 2004