使用Apple的新AudioEngine更改AudioPlayer声音的音高 [英] Using Apple's new AudioEngine to change Pitch of AudioPlayer sound

问题描述

我目前正在尝试使Apple的新音频引擎与我当前的音频设置一起使用.具体来说，我正在尝试使用音频引擎更改音高，根据

I am currently trying to get Apple's new audio engine working with my current audio setup. Specifically, I am trying to change the pitch with Audio Engine, which apparently is possible according to this post.

我还研究了其他音高变化解决方案，包括Dirac和ObjectAL，但不幸的是，就我正在使用的Swift而言，两者似乎都搞砸了.

I have also looked into other pitch changing solutions including Dirac and ObjectAL, but unfortunately both seem to be pretty messed up in terms of working with Swift, which I am using.

我的问题是如何使用Apple的新音频引擎更改音频文件的音高.我可以使用AVAudioPlayer播放声音，但无法获得如何在audioEngine中引用该文件.链接页面上的代码中有一个格式"，它指向音频文件，但是我没有得到如何创建格式或它的功能.

My question is how do I change the pitch of an audio file using Apple's new audio engine. I am able to play sounds using AVAudioPlayer, but I am not getting how the file is referenced in audioEngine. In the code on the linked page there is a 'format' that refers to audio file, but I am not getting how to create a format, or what it does.

我正在用以下简单代码播放声音:

I am playing sounds with this simple code:

let path = NSBundle.mainBundle().pathForResource(String(randomNumber), ofType:"m4r")
let fileURL = NSURL(fileURLWithPath: path!)
player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
player.prepareToPlay()
player.play()

推荐答案

您使用的是AVAudioPlayerNode，而不是AVAudioPlayer.

You use an AVAudioPlayerNode, not an AVAudioPlayer.

engine = AVAudioEngine()
playerNode = AVAudioPlayerNode()
engine.attachNode(playerNode)

然后，您可以附加一个AVAudioUnitTimePitch.

Then you can attach an AVAudioUnitTimePitch.

var mixer = engine.mainMixerNode;
auTimePitch = AVAudioUnitTimePitch()
auTimePitch.pitch = 1200 // In cents. The default value is 1.0. The range of values is -2400 to 2400
auTimePitch.rate = 2 //The default value is 1.0. The range of supported values is 1/32 to 32.0.
engine.attachNode(auTimePitch)
engine.connect(playerNode, to: auTimePitch, format: mixer.outputFormatForBus(0))
engine.connect(auTimePitch, to: mixer, format: mixer.outputFormatForBus(0))

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