1 //  MXAudioPlayerFadeOperation.h

     2 //

     3 //  Created by Andrew Mackenzie-Ross on 30/11/10.

     4 //  mackross.net

     5 //

     6 

     7 #import <Foundation/Foundation.h>

     8 

     9 @class AVAudioPlayer;

    10 @interface MXAudioPlayerFadeOperation : NSOperation {

    11   AVAudioPlayer *_audioPlayer;

    12   NSTimeInterval _fadeDuration;

    13   NSTimeInterval _delay;

    14   float _finishVolume;

    15   BOOL _pauseAfterFade;

    16   BOOL _stopAfterFade;

    17   BOOL _playBeforeFade;

    18 }

    19 

    20 // The AVAudioPlayer that the volume fade will be applied to. 

    21 // Retained until the fade is completed.

    22 // Must be set with init method.

    23 @property (nonatomic, retain, readonly) AVAudioPlayer *audioPlayer; 

    24 

    25 // The duration of the volume fade. 

    26 // Default value is 1.0

    27 @property (nonatomic, assign) NSTimeInterval fadeDuration; 

    28 

    29 // The delay before the volume fade begins. 

    30 // Default value is 0.0

    31 @property (nonatomic, assign) NSTimeInterval delay; 

    32 

    33 // The volume that will be faded to. 

    34 // Default value is 0.0

    35 @property (nonatomic, assign) float finishVolume; 

    36 

    37 // If YES, audio player will be sent a pause message when the fade has completed. 

    38 // Default value is NO, however, if finishVolume is 0.0, default is YES

    39 @property (nonatomic, assign) BOOL pauseAfterFade; 

    40 

    41 // If YES, when the fade has completed the audio player will be sent a stop message.

    42 // Default value is NO.

    43 @property (nonatomic, assign) BOOL stopAfterFade;

    44 

    45 // If YES, audio player will be sent a play message after the delay.

    46 // Default value is YES.

    47 @property (nonatomic, assign) BOOL playBeforeFade;

    48 

    49 // Init Methods

    50 - (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume overDuration:(NSTimeInterval)duration withDelay:(NSTimeInterval)timeDelay;

    51 - (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume overDuration:(NSTimeInterval)duration;

    52 - (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume;

    53 - (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player;

    54 

    55 @end