AudioContext.createWaveShaper()

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.

AudioContext 接口的 createWaveShaper() 方法创建了 表示非线性失真的WaveShaperNode。该节点通常被用来给音频添加失真效果

语法

js
var audioCtx = new AudioContext();
var distortion = audioCtx.createWaveShaper();

返回

A WaveShaperNode.

示例

下面的例子展示了 AudioContext 创建一个波形整形器节点的基本用法。有关应用示例/信息，请查看我们的 voice-change-O-matic demo 演示（有关代码，请参阅app.js）。

备注： 实现失真曲线并不是简单的事情，你可能需要到处找资料来找到这样的算法。我们在Stack Overflow上找到了以下的失真曲线代码

js
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var distortion = audioCtx.createWaveShaper();

  ...

function makeDistortionCurve(amount) {
  var k = typeof amount === 'number' ? amount : 50,
    n_samples = 44100,
    curve = new Float32Array(n_samples),
    deg = Math.PI / 180,
    i = 0,
    x;
  for ( ; i < n_samples; ++i ) {
    x = i * 2 / n_samples - 1;
    curve[i] = ( 3 + k ) * x * 20 * deg / ( Math.PI + k * Math.abs(x) );
  }
  return curve;
};

  ...

distortion.curve = makeDistortionCurve(400);
distortion.oversample = '4x';

规范

Specification
Web Audio API
# dom-baseaudiocontext-createwaveshaper

浏览器兼容性

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参见