CODEWITHSUNDEEP
macos
vego
vego

Reputation: 1059

What is the difference between defaultSystemOutputDevice and defautOutputdevice in MacOS?

What is the difference between defaultSystemOutputDevice and defautOutputdevice?

kAudioHardwarePropertyDefaultSystemOutputDevice vs kAudioHardwarePropertyDefaultOutputDevice?

Upvotes: 1

Views: 393

Answers (1)

Ken Thomases
Ken Thomases

Reputation: 90671

From the documentation in the header ($SDKROOT/System/Library/Frameworks/CoreAudio.framework/Versions/A/Headers/AudioHardware.h):

@constant       kAudioHardwarePropertyDefaultOutputDevice
                    The AudioObjectID of the default output AudioDevice.
@constant       kAudioHardwarePropertyDefaultSystemOutputDevice
                    The AudioObjectID of the output AudioDevice to use for system related sound
                    from the alert sound to digital call progress.

I think this has to do with a setting in the Sound pane of System Preferences. On the Sound Effects tab, there's a pop-up for "Play sound effects through:". You can configure it to follow the selected output device on the Output tab or specify a particular device. I believe this setting corresponds to kAudioHardwarePropertyDefaultSystemOutputDevice because of the mention of the alert sound in its description. kAudioHardwarePropertyDefaultOutputDevice would correspond to the setting on the Output tab.

Upvotes: 3

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