AVPlayer:无间距校正的变化率?

时间:2016-03-25 16:11:14

标签: ios audio avplayer

我正在使用AVPlayer的 rate 属性来更改音频样本的播放速度。它似乎总是应用音调校正,但我不需要音调校正,因此当它加速时它会像记录或旧的磁带播放器那样变得更高。在AVPLayer中有没有办法完全关闭音高修正?

我目前正在使用Swift 3,但也欢迎Objective C答案。

2 个答案:

答案 0 :(得分:1)

不确定使用AVPlayer是否可行,但是如果仅使用它来播放音频,则可以使用AVAudioEngine轻松实现:

var audioPlayer = AVAudioPlayerNode()
var engine = AVAudioEngine()
var speedControl = AVAudioUnitVarispeed()

// engine setup:

do {

    let file = try AVAudioFile(forReading: "myFile.mp3")

    engine.attach(audioPlayer)
    engine.attach(speedControl)

    engine.connect(audioPlayer, to: speedControl, format: nil)
    engine.connect(speedControl, to: engine.mainMixerNode, format: nil)

    audioPlayer.scheduleFile(file, at: nil)

    try engine.start()

} catch {
    print(error)
}

// changing rate without pitch correction:

speedControl.rate = 0.91

答案 1 :(得分:0)

实际上,使用AVPlayer可以实现-

let player = AVPlayer(url: fileURL)

// to turn off pitch correction:

player.currentItem?.audioTimePitchAlgorithm = .varispeed