我正在做一个项目，包括记录西瓜的重击声，并通过它发出的声音来预测它的甜度。我使用AVAudioRecorder来记录和保存音频。但是当我试图打开并读取文件时，它给了我一个错误(这个错误只发生在我在实际的iPhone Xr上测试应用程序时，而不是当我使用xcode模拟器时)，错误代码是:
"基础。_genericobjerror错误0".
下面是录音功能和提取音频功能:
private func startRecording() {
do {
if self.record{
// recording already started
recorder.stop()
self.record.toggle()
// updating data for every recording
self.getAudios()
return
}
// record audio
// store audio in document directory
// var highPassFilter = AVAudioUnitEQFilterType.highPass
// var lowPassFilter = AVAudioUnitEQFilterType.lowPass
let fileURL: URL = {
let src = "thump.wav"
return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0].appendingPathComponent(src)
}()
// let fileURL : URL = {
// return Bundle.main.url(forResource: "thump", withExtension: "wav")
// }()!
let recordSettings: [String : Any] = [AVFormatIDKey: Int(kAudioFormatLinearPCM),
AVSampleRateKey: 44100.0,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue ]
self.recorder = try AVAudioRecorder(url: fileURL, settings: recordSettings)
print(fileURL)
self.recorder.record()
print("Recording started")
self.record.toggle()
} catch {
print(error.localizedDescription)
}
}
func getAudios() {
do {
let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
// Fetch all data from document directory
let result = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil, options: .producesRelativePathURLs)
self.audios.removeAll()
for i in result {
self.audios.append(i)
}
}
catch {
print(error.localizedDescription)
}
}
这就是我在文件中得到错误的函数。read(into:buf):
func readAudioIntoFloats(fname: String, ext: String) -> [Float] {
let interleaved: Bool = false
let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let fileName = url.appendingPathComponent("(fname).(ext)")
// let fileName = Bundle.main.url(forResource: "thump", withExtension: "wav")
print(fileName)
let file = try! AVAudioFile(forReading: fileName)
let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: file.fileFormat.channelCount, interleaved: interleaved)!
let buf = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: 4096*24)!
do {
try file.read(into: buf)
} catch {
print(error.localizedDescription)
}
var floatArray: [Float] = []
if (Int(file.fileFormat.channelCount) == 2) {
let leftArray = Array(UnsafeBufferPointer(start: buf.floatChannelData?[0], count:Int(buf.frameLength)))
let rightArray = Array(UnsafeBufferPointer(start: buf.floatChannelData?[1], count:Int(buf.frameLength)))
for i in 0..<leftArray.count {
floatArray.append((leftArray[i]+rightArray[i])/Float(2))
}
} else {
floatArray = Array(UnsafeBufferPointer(start: buf.floatChannelData?[0], count:Int(buf.frameLength)))
}
print(floatArray.count)
return floatArray
}
更新:我通过将会话的类别设置为playandRecord
修复了这个问题