如何使用AudioKit保存音频文件？

Question

如何使用AudioKit保存音频文件？

10

我有一个音频文件。我对它进行了一些效果处理。

let pitchshifter = AKPitchShifter(self.audioPlayer)
pitchshifter.shift = 10
AudioKit.output = pitchshifter

如果我在应用程序中播放它，它可以工作，但我想将其保存为新文件以便稍后用作AVAsset。如何实现？

我尝试使用AKNodeRecorder，但这会产生空音轨：

let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("recorded")
let format = AVAudioFormat(commonFormat: .pcmFormatFloat64, sampleRate: 44100, channels: 2, interleaved: false)!
let tape = try! AKAudioFile(forWriting: url, settings: format.settings)
let mixer = AKMixer(self.audioPlayer!, pitchshifter)
AudioKit.output = mixer
self.recorder = try! AKNodeRecorder(node: mixer, file: tape)

try? AudioKit.start()
self.audioPlayer?.play()
self.audioPlayer?.completionHandler = {
    self.recorder?.stop()
    self.selectedAudioURL = tape.url
}

我也尝试了renderToFile方法-它也不起作用并且我得到了这个错误

let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("recorded.m4a")
let format = AVAudioFormat(commonFormat: .pcmFormatFloat64, sampleRate: 44100, channels: 2, interleaved: false)!
let tape = try! AKAudioFile(forWriting: url, settings: format.settings)
try! AudioKit.renderToFile(tape, seconds: Double(CMTimeGetSeconds(self.selectedAudioAsset!.duration)))

这是我如何向AudioKit添加初始文件的方法：

let audioFile = try AKAudioFile(forReading: audioURL, commonFormat: .pcmFormatFloat32, interleaved: true)
let player = AKPlayer(audioFile: audioFile)
self.audioFile = audioFile
self.audioPlayer = player
player.startTime = self.startTime
AKSettings.defaultToSpeaker = true

感谢您提前回答！

- Mikita Kaltsou

1个回答

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- August · Accepted Answer

根据我所了解的，您需要使用预渲染器来“播放”您想要记录的内容：

try AudioKit.renderToFile(outputFileForWriting, duration: sequencerTotalSeconds, prerender: {
    self.sequencer.play()
})

但是，对于我来说...渲染出单个轨道序列会产生一个正弦声音。 :-/

希望这能帮到你！