为什么Dolby Audio Bridge没有出现在Core Audio的选项中？
自 MacOS 10.13.6以后，Apple公司会要求用户授权安装内核扩展（ Kernel Extensions）的权限。
在Dolby Audio Bridge 安装过程中，您可以看到“系统扩展被阻止 System Extension Blocked dialog”的对话框，无论是否出现该提示，您都有30分钟的时间从系统偏好设置>安全和隐私中批准（“Allow 允许”）该扩展
如果超过了30分钟，您需要手动到/Macintosh/Library/Extensions路径下手动删除DolbyAudioBridge.kext文件，然后重新运行安装包。
“Allow 允许”的对话框会再次出现。极少情况下，你需要在High Sierra系统中关闭这个功能。终端窗口中的spctl功能可以关闭获取权限来加载.kext，这个功能需要稍后重新开启，因为这和您的Mac安全有很大关系。
Why don’t I see Dolby Audio Bridge as a core audio option?
Since the introduction of MacOS 10.13.6 Apple has required users to give permission to install kernel extensions.
During the initial Dolby Audio Bridge installation you should see a System Extension Blocked dialog. Whether or not that appears you have 30 minutes from the installation to approve (“allow”) the extension from System Preferences>Security and Privacy.
If more than 30 minutes elapses, you will need to manually remove the DolbyAudioBridge.kext file from Macintosh HD ▸ Library ▸ Extensions and re-run the installers.
The ability to “allow” the extension should appear. In rare cases you may need to disable this feature of High Sierra.
The spctl function can be used from the terminal window to disable the need to grant permissions to load a .kext. This should be re-enabled later as it has security implications for your MAC.
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