使用AVCaptureSession读取音频文件

let captureSession = AVCaptureSession()

guard let audioURL = Bundle.main.url(forResource: "audio", withExtension: "mp3") else { return }
let audioInput = try AVCaptureDeviceInput(device: AVCaptureDevice(url: audioURL))
captureSession.addInput(audioInput)

let audioOutput = AVCaptureAudioDataOutput()
captureSession.addOutput(audioOutput)

audioOutput.setSampleBufferDelegate(self, queue: DispatchQueue.main)

captureSession.startRunning()

extension ViewController: AVCaptureAudioDataOutputSampleBufferDelegate {
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        // 在这里处理音频数据
    }
}