withAudioOutputDevice

This backend, with its audio bound to the device that id names, one of audioOutputDevices.

On macOS the player then plays through that device, whatever the system default does. When the device has gone away, opening media fails with PlaybackError.AudioDeviceUnavailable rather than falling back to the default. When the device goes away while media is open, the player fails with the same error. On iOS only an output of the current route is accepted, and it changes nothing, because the audio session chooses the route.