AudioBufferSourceNode.buffer - Web API 接口参考 编辑

AudioBufferSourceNode 接口的 buffer 属性提供了重复播放音频的能力，该音频使用 AudioBuffer 作为声音文件的来源。

如果 buffer 属性的值为 null, 节点会自动生成一个单声道的无声文件（所有采样均为0）。

语法

AudioBufferSourceNode.buffer = soundBuffer;

返回值

AudioBuffer，包含了节点将要播放的声音数据。

示例

完整的示例请查看  this code running live，或  view the source。

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;
   }
  }

  // Get an AudioBufferSourceNode.
  // This is the AudioNode to use when we want to play an AudioBuffer
  var source = audioCtx.createBufferSource();
  // set the buffer in the AudioBufferSourceNode
  source.buffer = myArrayBuffer;

规范

Specification	Status	Comment
Web Audio API buffer	Working Draft	Initial definition

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相关链接

• Using the Web Audio API
• Web Audio API