Swift中的AURenderCallbackStruct [英] AURenderCallbackStruct in Swift

问题描述

我有一个AURenderCallbackStruct的Objective-C示例，我想快速地做一个。我读过这是不可能的，对吗？

I have an Objective-C example to an AURenderCallbackStruct, and I would like to do one in swift. I read it's not possible, is that correct?

谢谢。

推荐答案

您可以在Swift 4中格式化回调函数，如下所示。

You can format a callback function in Swift 4 like the following.

func recordingCallback(
  inRefCon:UnsafeMutableRawPointer,
  ioActionFlags:UnsafeMutablePointer<AudioUnitRenderActionFlags>,
  inTimeStamp:UnsafePointer<AudioTimeStamp>,
  inBusNumber:UInt32,
  inNumberFrames:UInt32,
  ioData:UnsafeMutablePointer<AudioBufferList>?) -> OSStatus {


  return noErr
}

请注意，这必须是全局函数，并且不是在类内部。

Note this must be a global function and not inside of a class.

然后，您可以使用以下代码设置回调函数：

You can then set your callback function with the following code:

var callbackStruct = AURenderCallbackStruct()
callbackStruct.inputProc = recordingCallback
callbackStruct.inputProcRefCon = nil
status = AudioUnitSetProperty(remoteIOUnit!,
                                  kAudioOutputUnitProperty_SetInputCallback,
                                  kAudioUnitScope_Global,
                                  bus1,
                                  &callbackStruct,
                                  UInt32(MemoryLayout<AURenderCallbackStruct>.size));
if (status != noErr) {
  return status // Do something with the error
}

来源

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