project_files/HedgewarsMobile/Classes/MXAudioPlayerFadeOperation.m
author koda
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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, retain, 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 retain];
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  }
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  return [result autorelease];
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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 release];
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      _audioPlayer = [anAudioPlayer retain];
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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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  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
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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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  [pool release];
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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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- (void)dealloc {
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  releaseAndNil(_audioPlayer);
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  [super dealloc];
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}
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@end
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