使用AudioEngine的声音效果 [英] Using sound effects with AudioEngine

问题描述

背景 - 我在Apple最近的WWDC上发布的以下视频列表中看到了一个名为AVAudioEngine in Practice的视频，用于将声音效果应用于音频。
https://developer.apple.com/videos/wwdc/2014/

Background - I saw a video titled "AVAudioEngine in Practice" from the following list of videos published at Apple's recent WWDC to apply sound effects to an audio. https://developer.apple.com/videos/wwdc/2014/

之后，我成功地使用以下代码更改了音频的音高：

After that, I was successfully able to change the pitch of an audio with the following code:

 //Audio Engine is initialized in viewDidLoad()
 audioEngine = AVAudioEngine()
 //The following Action is called on clicking a button
 @IBAction func chipmunkPlayback(sender: UIButton) {
        var pitchPlayer = AVAudioPlayerNode()
        var timePitch = AVAudioUnitTimePitch()
        timePitch.pitch = 1000

        audioEngine.attachNode(pitchPlayer)
        audioEngine.attachNode(timePitch)

        audioEngine.connect(pitchPlayer, to: timePitch, format: myAudioFile.processingFormat)
        audioEngine.connect(timePitch, to: audioEngine.outputNode, format: myAudioFile.processingFormat)

        pitchPlayer.scheduleFile(myAudioFile, atTime: nil, completionHandler: nil)
        audioEngine.startAndReturnError(&er)

        pitchPlayer.play()

    }

根据我的理解，我使用AudioEngine将AudioPlayerNode与AudioEffect连接，而AudioEffect又连接到输出。

From what I understand, I used the AudioEngine to attach the AudioPlayerNode with the AudioEffect, which I in turn attached to the Output.

我现在很想知道为音频添加多种音效。例如，音高变化和混响。我如何为音频添加多个声音效果？

I am now curious about adding multiple sound effects to the audio. For instance, pitch change AND reverb. How would I go about adding multiple sound effects to the audio?

此外，在viewDidLoad中连接和连接节点是否有意义，而不是我在这里完成的方式在IBAction中？

Also, would it make sense to attach and connect the nodes in viewDidLoad rather than how I have done it here in an IBAction ?

推荐答案

只需连接它们。

engine.connect(playerNode, to: reverbNode, format: format)
engine.connect(reverbNode, to: distortionNode, format: format)
engine.connect(distortionNode, to: delayNode, format: format)
engine.connect(delayNode, to: mixer, format: format)

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