AudioBuffer.sampleRate

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

AudioBuffer 接口的 sampleRate 属性返回一个以浮点数表示的采样率。该采样率是存储在缓冲区的 PCM 数据每秒钟的采样。

语法

js
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
myArrayBuffer.sampleRate;

返回值

一个浮点数，表示缓冲区数据的当前采样率。

示例

js
// Stereo
var channels = 2;

// Create an empty two second stereo buffer at the
// sample rate of the AudioContext
var frameCount = audioCtx.sampleRate * 2.0;
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);

button.onclick = function () {
  // Fill the buffer with white noise;
  // just random values between -1.0 and 1.0
  for (var channel = 0; channel < channels; channel++) {
    // This gives us the actual ArrayBuffer that contains the data
    var nowBuffering = myArrayBuffer.getChannelData(channel);
    for (var i = 0; i < frameCount; i++) {
      // Math.random() is in [0; 1.0]
      // audio needs to be in [-1.0; 1.0]
      nowBuffering[i] = Math.random() * 2 - 1;
    }
  }

  console.log(myArrayBuffer.sampleRate);
};

规范

Specification
Web Audio API
# dom-audiobuffer-samplerate

浏览器兼容性

参见