Updates the value of the master output plug (simulating a lock transaction).
Mac Catalyst 13.0+Beta
Pointer to IOFireWireAVCLibProtocolInterface.
Value returned by readOutputMasterPlug.
New value to store in plug if its current value is oldVal.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.