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 |
浏览器兼容性
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