![]() The algorithm will identify the endpoint with the newest timestamp property as the default endpoint. In Windows 7, an endpoint's timestamp property is created or updated when it is set as the default audio endpoint through the Control Panel Sound application.Ī timestamp property is associated to each role, and the timestamp property is used by the default selection algorithm to identify which endpoints have been set as the preferred default by the user for that role. The endpoint timestamp property is a property key containing the system time. ![]() The Endpoint Timestamp Property In Windows 7 In response to such operations, the Windows audio subsystem runs the default audio endpoint heuristic algorithm to determine the new default audio endpoint. Such events include inserting an audio device, unplugging a device, and installing a new audio device. ![]() Any events that cause an endpoint's state to change from or to the ACTIVE state can potentially affect the current default audio endpoint. The audio subsystem considers only ACTIVE endpoints (in the present and enabled state) when it determines the default audio endpoint. There are four endpoint states: ACTIVE, UNPLUGGED, DISABLED, and NOT PRESENT, that are defined in DEVICE_STATE_XXX Constants.
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