![]() ![]() ![]() The audio driver then calls another instance of IOCTL_BTHHFP_DEVICE_GET_CONNECTION_STATUS_UPDATE to receive the next status change. If the status has changed, the audio driver raises the KSEVENT_PINCAPS_JACKINFOCHANGE event, causing the audio system to reevaluate the connection state. When IOCTL_BTHHFP_DEVICE_GET_CONNECTION_STATUS_UPDATE completes successfully, the audio driver updates IsConnected with the new connection status. The driver uses this value when handling the KSPROPERTY_JACK_DESCRIPTION property. The audio driver must support KSPROPERTY_JACK_DESCRIPTION and maintain an IsConnected field in the filter factory context. This article discusses how the audio system determines and handles connection status information for a Bluetooth hands-free profile (HFP) device. ![]()
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