AudioContext.createDelay()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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createDelay() 是 AudioContext 的一个方法，作用是将输入音频信号延迟一定时间。（比如可以实现 对着话筒说句话，然后几秒后 这句话从音响里播放出来）

语法

js
var audioCtx = new AudioContext();
var synthDelay = audioCtx.createDelay(maxDelayTime);

参数

maxDelayTime

设置最大允许延迟的时间，以“秒”为单位

返回

A DelayNode. The default DelayNode.delayTime if no parameter is passed to createDelay() is 0 seconds.

以上是原文，大意是返回延时时间，没有设置时默认是 0

示例

我们创建了一个允许你循环播放三个不同样例的简单示例——参阅 create-delay（你也可以查看源代码）。如果你只按下播放按钮，循环将立刻开始；如果你将滑块向右滑动，然后按下播放按钮，则会引入延迟，因此循环的声音不会立刻开始播放。

js
const audioCtx = new AudioContext();

const synthDelay = audioCtx.createDelay(5.0);

// …

let synthSource;

playSynth.onclick = () => {
  synthSource = audioCtx.createBufferSource();
  synthSource.buffer = buffers[2];
  synthSource.loop = true;
  synthSource.start();
  synthSource.connect(synthDelay);
  synthDelay.connect(destination);
  this.setAttribute("disabled", "disabled");
};

stopSynth.onclick = () => {
  synthSource.disconnect(synthDelay);
  synthDelay.disconnect(destination);
  synthSource.stop();
  playSynth.removeAttribute("disabled");
};

// …

let delay1;
rangeSynth.oninput = () => {
  delay1 = rangeSynth.value;
  synthDelay.delayTime.setValueAtTime(delay1, audioCtx.currentTime);
};

规范

Specification
Web Audio API
# dom-baseaudiocontext-createdelay

浏览器兼容性

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参见