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An audio or video renderer is losing or gaining activation. The audio or video renderer sends this event notification.
Parameters
- lParam1
- Set to 1 if activation gained, or 0 if lost.
- lParam2
- Pointer to the
IBaseFilterinterface
that is sending the event notification.
Remarks
This event notification is not sent to the application. This notification is used for sound-follows-focus and full-screen switching. To interact in full-screen protocols, a video renderer should send an EC_ACTIVATEnotification whenever its window is either activated or deactivated. In other words, an EC_ACTIVATEnotification should be sent for each WM_ACTIVATEAPP message received by a renderer.
For information on how to use this event code, see CBaseFilter::NotifyEvent.