尽管在 Swift 中使用 prepareToPlay() ，AVAudioPlayer 仍会产生延迟 [英] AVAudioPlayer produces lag despite prepareToPlay() in Swift

问题描述

在我用 Swift 编程的 SpriteKit iOS 游戏中，播放很短的声音(~0.5 秒)会产生打嗝(如延迟).在其他问题中，我读到我应该 prepareToPlay() 声音，我做到了.

Playing a very short sound (~0.5s) produces a hiccup (like a lag) in my SpriteKit iOS game programmed in Swift. In other questions, I read that I should prepareToPlay() the sound, which I did.

我什至使用了一个变量 (soundReady) 来检查在播放之前是否准备好声音.我还会在播放结束时重新准备声音 (audioPlayerDidFinishPlaying()).以下是代码的相关部分:

I even used a variable (soundReady) to check if the sound is prepared before playing it. I also re-prepare the sound whenever it is finished playing (audioPlayerDidFinishPlaying()). Here are the relevant parts of the code:

class GameScene: SKScene, AVAudioPlayerDelegate {

   var splashSound = NSURL()
   var audioPlayer = AVAudioPlayer()
   var soundReady = false

   override func didMoveToView(view: SKView) {
      let path = NSBundle.mainBundle().pathForResource("plopSound", ofType: "m4a")
      splashSound = NSURL(fileURLWithPath: path)
      audioPlayer = AVAudioPlayer(contentsOfURL: splashSound, error: nil)
      audioPlayer.delegate = self
      soundReady = audioPlayer.prepareToPlay()
   }

   func playSound(){
      if(soundReady){
         audioPlayer.play()
         soundReady = false
      }
   }

   func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool){
      //Prepare to play after Sound finished playing
      soundReady = audioPlayer.prepareToPlay()
   }
}

我不知道我在这个问题上哪里出了问题.我觉得我什么都试过了(包括但不限于:只准备一次，玩完就准备，不使用变量，只是prepareToPlay()).

I have no idea where I've gone wrong on this one. I feel like I have tried everything (including, but not limited to: only preparing once, preparing right after playing, not using a variable, but just prepareToPlay()).

附加信息:

• 声音立即播放.
• 最后完成后播放声音的速度似乎不会影响延迟.

推荐答案

我遇到了同样的问题，并在 backgroundQueue 中播放了声音.

I ran into this same problem and played the sound in the backgroundQueue.

这是一个很好的例子:https://stackoverflow.com/a/25070476/586204.

This is a good example: https://stackoverflow.com/a/25070476/586204.

let qualityOfServiceClass = QOS_CLASS_BACKGROUND
let backgroundQueue = dispatch_get_global_queue(qualityOfServiceClass, 0)
dispatch_async(backgroundQueue, {
    audioPlayer.play()
})

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