使用AVAudioEngine录制音频文件

Question

我想使用AVAudioEngine录制音频文件.所以它将从麦克风到输出文件.稍后我会添加一些效果.但就目前而言,我只想让它发挥作用.

任何人都可以向我提供步骤或示例代码,以便我可以开始吗？

Answer 1

这是我的简单解决方案.输出文件将在文档目录中.请注意,为简洁起见,我删除了错误处理.

var engine = AVAudioEngine()
var file: AVAudioFile?
var player = AVAudioPlayerNode() // if you need play record later

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    file = AVAudioFile(forWriting: URLFor("my_file.caf")!, settings: engine.inputNode.inputFormatForBus(0).settings, error: nil)
    engine.attachNode(player)
    engine.connect(player, to: engine.mainMixerNode, format: engine.mainMixerNode.outputFormatForBus(0)) //configure graph
    engine.startAndReturnError(nil)
}

@IBAction func record(sender: AnyObject) {
    engine.inputNode.installTapOnBus(0, bufferSize: 1024, format: engine.mainMixerNode.outputFormatForBus(0)) { (buffer, time) -> Void in
        self.file?.writeFromBuffer(buffer, error: nil)
        return
    }
}

@IBAction func stop(sender: AnyObject) {
    engine.inputNode.removeTapOnBus(0)
}


func URLFor(filename: String) -> NSURL? {
    if let dirs : [String] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String] {
        let dir = dirs[0] //documents directory
        let path = dir.stringByAppendingPathComponent(filename)
        return NSURL(fileURLWithPath: path)
    }
    return nil
}