Swift3麦克风音频输入 - 无记录播放

时间:2017-04-27 15:37:29

标签: ios swift3 avfoundation

我正在尝试使用swift3播放麦克风音频输入而不录制。我可以使用以下代码录制音频:

let session = AVAudioSession.sharedInstance()
    try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with:AVAudioSessionCategoryOptions.defaultToSpeaker)

    try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
    audioRecorder.delegate = self
    audioRecorder.isMeteringEnabled = true
    audioRecorder.prepareToRecord()
    audioRecorder.record()

然后在拿起录制的文件后最终播放:

audioPlayerNode.play()

但是我想跳过录音步骤直接从麦克风输入到音频输出(在这种情况下是播放器节点)。它的功能就像一个真正的麦克风。我可以直接执行此操作还是需要存在临时文件?我梳理了AVFoundation文档,但我似乎无法掌握直接路由。任何想法或建议表示赞赏。谢谢!

1 个答案:

答案 0 :(得分:2)

您可以使用AVAudioEngine执行此操作,但您会听到反馈意见:

import AVFoundation

class ViewController: UIViewController {
    let engine = AVAudioEngine()

    override func viewDidLoad() {
        super.viewDidLoad()

        let input = engine.inputNode!
        let player = AVAudioPlayerNode()
        engine.attach(player)

        let bus = 0
        let inputFormat = input.inputFormat(forBus: bus)
        engine.connect(player, to: engine.mainMixerNode, format: inputFormat)

        input.installTap(onBus: bus, bufferSize: 512, format: inputFormat) { (buffer, time) -> Void in
            player.scheduleBuffer(buffer)
        }

        try! engine.start()
        player.play()
    }
}