getVolume

The groupVolume event in the groupVolume namespace indicates changes to group volume, the group mute state and whether the group volume is fixed or can be changed.

When your app subscribes to the groupVolume namespace and receives this event, it can update its user interface to reflect the latest group volume and group mute state. For example, if a user configures a CONNECT to have a fixed line-out volume, your app will receive a groupVolume event with the fixed parameter value of true. Your app should then disable its volume slider so users know that volume adjustments are not permitted.

Your app can expect to receive one or multiple groupVolume events associated with a single setVolume command. This is because the individual player volume changes become effective at different times, and groupVolume events may or may not be generated for each of the individual player volume changes. Your app is guaranteed to receive a final groupVolume event when all individual player volume changes are stable. See setVolume for more information on how group volume works.

The group mute state is independent of the group volume value, so your app can have a separate mute button and update its state based on the muted parameter in the groupVolume event. The group coordinator also calculates the group mute state by taking into account all the individual player mute states. If all of the players in a group are muted, the muted state for the group is true. If at least one player in a group is not muted then the muted state for the group is false. See setMute for more information on the group mute state.