AVAudioMixerNode平移或AVAudioUnitSampler立体声平移属性无法更改AVAudioEngine的声音输出的左右平衡 [英] AVAudioMixerNode pan or AVAudioUnitSampler stereoPan properties not working to change left/right balance of sound output for AVAudioEngine

问题描述

我有以下代码，只演奏一个中音，但我希望能够调整平衡/声像，使其仅在左扬声器或右扬声器或某些组合之外播放.我认为更改"sampler.stereoPan"或"engine.mainMixerNode.pan"会达到目的，但似乎没有效果.有什么想法我做错了吗?

I have the following code, which plays a single midi note, but I want to be able to adjust the balance/pan so that it only plays out of the left speaker or the right speaker or perhaps some combination. I thought changing "sampler.stereoPan" or perhaps "engine.mainMixerNode.pan" would do the trick but it seems to have no effect. Any ideas what I'm doing wrong?

engine = AVAudioEngine()
sampler = AVAudioUnitSampler()

sampler.stereoPan = -1.0 // doesn't work
//engine.mainMixerNode.pan = -1.0 // doesn't work

engine.attachNode(sampler)
engine.connect(sampler, to: engine.mainMixerNode, format: engine.mainMixerNode.outputFormatForBus(0))

var error: NSError?
engine.startAndReturnError(&error)

sampler.startNote(65, withVelocity: 64, onChannel: 1)

推荐答案

根据 Apple开发者论坛 stereopan 的范围是-100到100.

According to Apple Developer Forum the range of stereopan is -100 to 100.

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