Specifies whether audio I/O is enabled for an I/O unit bus-scope combination.
- iOS 10.0+
- macOS 10.12+
- Mac Catalyst 13.0+
- tvOS 10.0+
An I/O unit’s bus 0 connects to output hardware, such as for playback through a speaker. Output is enabled by default. To disable output, the bus 0 output scope must be disabled, as follows:
An I/O unit’s bus 1 connects to input hardware, such as for recording from a microphone. Input is disabled by default. To enable input, the bus 1 input scope must be enabled, as follows:
UInt32 value valid on the input and output scopes.