@interface GroupActivities.PlaybackSyncer : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ localParticipantState;
    void /* unknown type, empty encoding */ transportControlStates;
    void /* unknown type, empty encoding */ messageEncoder;
    void /* unknown type, empty encoding */ messageDecoder;
    void /* unknown type, empty encoding */ cancellables;
    void /* unknown type, empty encoding */ reloadCompletion;
    void /* unknown type, empty encoding */ hasReceivedTransportState;
    void /* unknown type, empty encoding */ transportStateTakeoverWorkItem;
    void /* unknown type, empty encoding */ waitingForCatchupResponseFromParticipants;
    void /* unknown type, empty encoding */ queue;
    void /* unknown type, empty encoding */ avMediumDelegate;
    void /* unknown type, empty encoding */ coordinator;
    void /* unknown type, empty encoding */ link;
    void /* unknown type, empty encoding */ syncerDelegate;
    void /* unknown type, empty encoding */ defaultTransportStateTakeoverInterval;
    void /* unknown type, empty encoding */ initiatorTransportStateTakeoverInterval;
}

@end