来自UnsafePointer< UnsafePointer< CFloat>>.到Swift中的浮动数组? [英] From UnsafePointer<UnsafePointer<CFloat>> to an array of floats in Swift?

问题描述

我正在尝试使用Swift访问AVAudioPCMBuffer.floatChannelData，但是它的类型是UnsafePointer<UnsafePointer<CFloat>>(在Objective-C中，@property(nonatomic, readonly) float *const *floatChannelData)，我进行的任何尝试都导致执行失败.

I'm trying to access AVAudioPCMBuffer.floatChannelData using Swift but it is of type UnsafePointer<UnsafePointer<CFloat>> (in Objective-C, @property(nonatomic, readonly) float *const *floatChannelData) and any attempt I make to access it results in execution failed.

在先前的问题中包含了在Swift Playground中设置快速AVAudioPCMBuffer的示例代码:

Sample code to set-up a quick AVAudioPCMBuffer in a Swift Playground is included in a previous question:

使AVAudioPCMBuffer正常工作(AVAudioFile.mm错误代码-50)

推荐答案

这项工作有效吗?

let channels = UnsafeBufferPointer(start: myAudioBuffer.floatChannelData, count: Int(myAudioBuffer.format.channelCount))
let floats = UnsafeBufferPointer(start: channels[0], count: Int(myAudioBuffer.frameLength))

这篇关于来自UnsafePointer< UnsafePointer< CFloat>>.到Swift中的浮动数组?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！