<commit_before>extern NSString *const _AVSystemController_HeadphoneJackIsConnectedDidChangeNotification;
extern NSString *const _AVSystemController_HeadphoneJackIsConnectedAttribute;

@interface AVSystemController : NSObject

+ (instancetype)sharedAVSystemController;

- (id)attributeForKey:(id)key;

@end<commit_msg>[Celestial] Add setAttribute: method to AVSystemController, fix extern symbol names<commit_after>extern NSString *const AVSystemController_HeadphoneJackIsConnectedDidChangeNotification;
extern NSString *const AVSystemController_HeadphoneJackIsConnectedAttribute;

@interface AVSystemController : NSObject

+ (instancetype)sharedAVSystemController;

- (id)attributeForKey:(NSString *)key;
- (BOOL)setAttribute:(id)value forKey:(NSString *)key error:(NSError **)error;

@end
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