Gets the status of the audio device watcher

• None

• A boolean, true if the watcher is running, false if not

Sets the callback function for the audio device watcher

• fn - A callback function, or nil to remove a previously set callback. The callback function should accept a single argument (see Notes below)

• None

• This watcher will call the callback when various audio device related events occur (e.g. an audio device appears/disappears, a system default audio device setting changes, etc)
• To watch for changes within an audio device, see hs.audiodevice:newWatcher()
• The callback function argument is a string which may be one of the following strings, but might also be a different string entirely:
• dIn - Default audio input device setting changed (Note that there is a space character after dIn, because these values always have to be four characters long)
• dOut - Default audio output device setting changed
• sOut - Default system audio output setting changed (i.e. the device that system sound effects use. This may also be triggered by dOut, depending on the user's settings)
• dev# - An audio device appeared or disappeared
• The callback will be called for each individual audio device event received from the OS, so you may receive multiple events for a single physical action (e.g. unplugging the default audio device will cause dOut and dev# events, and possibly sOut too)
• Passing nil will cause the watcher to stop if it is already running

Starts the audio device watcher

• None

• None

Stops the audio device watcher

• None

• The hs.audiodevice.watcher object