设置AVAudioEngine输入和输出设备

问题描述

我一直在使用Apple闪亮的新AVFoundation库，但是到目前为止，我还无法设置AVAudioEngine使用的输入或输出设备(例如USB声卡)，我可以似乎在文档中找不到任何东西说甚至有可能.

I've been playing around with Apple's shiny new AVFoundation library, but so far I've unable to set the input or output devices (e.g. a USB sound card) used by an AVAudioEngine, and I can't seem to find anything in the documentation to say it's even possible.

有人对此有任何经验吗?

Does anyone have any experience with this?

推荐答案

好，在第十次重新阅读文档之后，我注意到AVAudioEngine具有成员 inputNode 和 outputNode (不确定如何我错过了！).

Ok, after re-reading the docs for the 10th time, I noticed AVAudioEngine has members inputNode and outputNode (not sure how I missed that!).

以下代码似乎可以完成这项工作:

The following code seems to do the job:

AudioDeviceID inputDeviceID = 53; // get this using AudioObjectGetPropertyData
AVAudioEngine *engine = [[AVAudioEngine alloc] init];
AudioUnit audioUnit = [[engine inputNode] audioUnit];

OSStatus error = AudioUnitSetProperty(audioUnit,
                                      kAudioOutputUnitProperty_CurrentDevice,
                                      kAudioUnitScope_Global,
                                      0,
                                      &inputDeviceID,
                                      sizeof(inputDeviceID));

我从 CAPlayThrough 示例.

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