@protocol JWLevelsEvent <NSObject>
The JWLevelsEvent is emitted when the quality levels or audio tracks information become available.
The full array of quality levels in the case of onLevels. The full array of audio tracks in the case of onAudioTracks. Returns nil in the case of an HLS stream.
@property (nonatomic, assign, unsafe_unretained, readwrite) NSArray *_Nonnull levels;