@interface PKDurationSnapshot : NSObject @property (nonatomic, readonly) void /* unknown type, empty encoding */ snapshotTime; @property (nonatomic, readonly) void /* unknown type, empty encoding */ rate; @property (nonatomic, readonly) void /* unknown type, empty encoding */ elapsedDuration; @property (nonatomic, readonly) void /* unknown type, empty encoding */ duration; - (id)init; - (id)initWithSnapshotTime:(double)a0 rate:(float)a1 elapsedDuration:(double)a2 duration:(double)a3; @end