使AVAudioPCMBuffer工作(AVAudioFile.mm错误代码-50) [英] Getting AVAudioPCMBuffer working (AVAudioFile.mm error code -50)

问题描述

我正在尝试在Swift游乐场(下面的代码)中建立一个基本示例，但也已使用Objective-C进行了尝试，获得了相同的结果.

I'm trying to set up a basic example in a Swift playground (code below) but have also tried it with Objective-C with the same result.

import AVFoundation

let fileURL = ... // have tried a wav file and a aiff file
let myAudioFile = AVAudioFile(forReading: fileURL, error: nil)
let myAudioFormat = myAudioFile.fileFormat
let myAudioFrameCount = UInt32(myAudioFile.length)
var myAudioBuffer = AVAudioPCMBuffer(PCMFormat: myAudioFormat, frameCapacity: myAudioFrameCount)
// have also tried a smaller frameCapacity

到目前为止，它仍然可以正常工作，但是在此终止:

It works fine up to this point, but then terminates with this:

var myError: NSError?
myAudioFile.readIntoBuffer(myAudioBuffer, error:&myError)

我也尝试用buffer:myAudioBuffer命名该参数，但这会导致外部参数"错误.

I have also tried naming the argument with buffer:myAudioBuffer but that gives an "extraneous argument" error.

最终，我想从缓冲区中获取原始的PCM数据，作为Swift的float数组.

Ultimately, I want to get out raw PCM data from the buffer as a Swift array of floats.

推荐答案

必须将AVAudioPCMBuffer的PCMFormat设置为AVAudioFile的.processingFormat，而 not .fileFormat:我认为这些是相同的，但事实并非如此！

The AVAudioPCMBuffer's PCMFormat has to be set as the AVAudioFile's .processingFormat and not its .fileFormat: I thought these were the same, but that's not the case!

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