@class NSObject;
@protocol OS_dispatch_queue, OS_dispatch_source;
@interface OKAudioDucker : NSObject {
float _currentVolume;
float _fadeToVolume;
float _fadeFromVolume;
float _duckLevel;
double _startFadeTime;
long long _duckState;
double _fadeDuration;
double _duckDuration;
NSObject<OS_dispatch_queue> *_queue;
NSObject<OS_dispatch_source> *_timer;
id /* block */ _setVolumeBlock;
}
@property (nonatomic) float volume;
- (id)init;
- (void)dealloc;
- (void)cancel;
- (void)_handleTimerEvent;
- (void)beginDuckingToLevel:(double)a0 fadeDuration:(double)a1;
- (void)beginFadingWithDuration:(double)a0;
- (void)endDucking;
- (void)endFading;
- (void)endFading:(BOOL)a0;
- (void)setSetVolumeBlock:(id /* block */)a0;
@end