author | Wuzzy <Wuzzy2@mail.ru> |
Wed, 15 May 2019 04:06:47 +0200 | |
changeset 14974 | 6c17ef373079 |
parent 12872 | 00215a7ec5f5 |
permissions | -rw-r--r-- |
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// MXAudioPlayerFadeOperation.m |
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// |
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// Created by Andrew Mackenzie-Ross on 30/11/10. |
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// mackross.net. |
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// |
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#import "MXAudioPlayerFadeOperation.h" |
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#import <AVFoundation/AVFoundation.h> |
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#define SKVolumeChangesPerSecond 15 |
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@interface MXAudioPlayerFadeOperation () |
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@property (nonatomic, strong, readwrite) AVAudioPlayer *audioPlayer; |
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- (void)beginFadeOperation; |
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- (void)finishFadeOperation; |
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@end |
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@implementation MXAudioPlayerFadeOperation |
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#pragma mark - |
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#pragma mark Properties |
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@synthesize audioPlayer = _audioPlayer; |
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@synthesize fadeDuration = _fadeDuration; |
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@synthesize finishVolume = _finishVolume; |
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@synthesize playBeforeFade = _playBeforeFade; |
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@synthesize pauseAfterFade = _pauseAfterFade; |
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@synthesize stopAfterFade = _stopAfterFade; |
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@synthesize delay = _delay; |
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#pragma mark - |
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#pragma mark Accessors |
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- (AVAudioPlayer *)audioPlayer { |
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AVAudioPlayer *result; |
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@synchronized(self) { |
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result = _audioPlayer; |
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} |
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return result; |
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} |
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- (void)setAudioPlayer:(AVAudioPlayer *)anAudioPlayer { |
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@synchronized(self) { |
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if (_audioPlayer != anAudioPlayer) { |
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_audioPlayer = anAudioPlayer; |
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} |
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} |
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} |
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#pragma mark - |
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#pragma mark NSOperation |
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- (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume overDuration:(NSTimeInterval)duration withDelay:(NSTimeInterval)timeDelay { |
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if ((self = [super init])) { |
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self.audioPlayer = player; |
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[player prepareToPlay]; |
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_fadeDuration = duration; |
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_finishVolume = volume; |
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_playBeforeFade = YES; |
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_stopAfterFade = NO; |
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_pauseAfterFade = (volume == 0.0) ? YES : NO; |
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_delay = timeDelay; |
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} |
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return self; |
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} |
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- (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume overDuration:(NSTimeInterval)duration { |
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return [self initFadeWithAudioPlayer:player toVolume:volume overDuration:duration withDelay:0.0]; |
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} |
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- (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player toVolume:(float)volume { |
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return [self initFadeWithAudioPlayer:player toVolume:volume overDuration:1.0]; |
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} |
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- (id)initFadeWithAudioPlayer:(AVAudioPlayer*)player { |
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return [self initFadeWithAudioPlayer:player toVolume:0.0]; |
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} |
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- (id) init { |
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ALog(@"Failed to init class (%@) with AVAudioPlayer instance, use initFadeWithAudioPlayer:",[self class]); |
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return nil; |
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} |
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- (void)main { |
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@autoreleasepool { |
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[NSThread sleepForTimeInterval:_delay]; |
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if ([self.audioPlayer isKindOfClass:[AVAudioPlayer class]]) { |
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[self beginFadeOperation]; |
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} |
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else { |
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ALog(@"AudioPlayerFadeOperation began with invalid AVAudioPlayer"); |
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} |
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} |
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} |
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- (void)beginFadeOperation { |
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if (![self.audioPlayer isPlaying] && _playBeforeFade) [self.audioPlayer play]; |
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if (_fadeDuration != 0.0) { |
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NSTimeInterval sleepInterval = (1.0 / SKVolumeChangesPerSecond); |
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NSTimeInterval startTime = [[NSDate date] timeIntervalSinceReferenceDate]; |
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NSTimeInterval now = startTime; |
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float startVolume = [self.audioPlayer volume]; |
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while (now < (startTime + _fadeDuration)) { |
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float ratioOfFadeCompleted = (now - startTime)/_fadeDuration; |
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float volume = (_finishVolume * ratioOfFadeCompleted) + (startVolume * (1-ratioOfFadeCompleted)); |
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[self.audioPlayer setVolume:volume]; |
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[NSThread sleepForTimeInterval:sleepInterval]; |
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now = [[NSDate date] timeIntervalSinceReferenceDate]; |
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} |
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[self.audioPlayer setVolume:_finishVolume]; |
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[self finishFadeOperation]; |
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} |
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else { |
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[self.audioPlayer setVolume:_finishVolume]; |
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[self finishFadeOperation]; |
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} |
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} |
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- (void)finishFadeOperation { |
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if ([self.audioPlayer isPlaying] && _pauseAfterFade) [self.audioPlayer pause]; |
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if ([self.audioPlayer isPlaying] && _stopAfterFade) [self.audioPlayer stop]; |
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} |
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@end |
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