Line-In
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When using speakers that have Line-In support, you can set controllers to play them like so:
$office = $sonos->getSpeakerByRoom("Office");
$bedroom = $sonos->getControllerByRoom("Bedroom");
$bedroom->useLineIn($office)->play();
Line-In usage is technically a stream, so Controller::isStreaming() will return true.
The useLineIn() parameter is optional if you want the controller to play its own Line-In, however this might not have the desired effect if speakers are grouped, as the speaker with the Line-In option might not be the controller, so it’s recommended that you always pass a speaker instance.
$sonos->getControllerByRoom("Bedroom")->useLineIn()->play();