原理解析之蓝牙协议栈和语音网关(1)(2)

◆语音网关Audio Gate）

Windows Embedded CE supports Headset Profile and the Hands-Free Profile by providing the Audio Gateway (AG) service that links Bluetooth devices by using the Winsock interface to the Bluetooth Protocol Stack. This service provides the functionality to interface with TAPI to control a cellular phone and route audio to the Bluetooth chip.

The AG service is implemented as a DLL, Btagsvc.dll that resides in Services.exe and can be controlled by external modules through IOCTLs provided by Services.exe.

The AG service supports audio routing by using the audio driver message, WODM_BT_SCO_AUDIO_CONTROL, that routes audio to the Bluetooth chip.

Headset and Hands-free Profiles架构图:

由此可见,微软已经提供了语音网关服务来支持蓝牙耳机,所以,我们要做的也就是将语音网关服务AG）Enable.