readAttributePlaybackSpeed(completion:)
Declaration
func readAttributePlaybackSpeed(completion: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributePlaybackSpeed() async throws -> NSNumberfunc readAttributePlaybackSpeed(completion: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributePlaybackSpeed() async throws -> NSNumber