AudioWorkletNode.port

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句法
范例
规范
浏览器兼容性
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这是实验性技术
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只读 port 特性为 AudioWorkletNode interface returns the associated MessagePort . It can be used to communicate between the node and its associated AudioWorkletProcessor .

注意 : The port at the other end of the channel is available under the port property of the processor.

句法

audioWorkletNodeInstance.port;

值

MessagePort object that is connecting the AudioWorkletNode and its associated AudioWorkletProcessor .

范例

To demonstrate bidirectional communication capabilities, we'll create an AudioWorkletProcessor , which will output silence and respond to ping requests from its AudioWorkletNode .

First, we need to define a custom AudioWorkletProcessor , and register it. Note that that this should be done in a separate file.

// ping-pong-processor.js
class PingPongProcessor extends AudioWorkletProcessor {
  constructor (...args) {
    super(...args)
    this.port.onmessage = (e) => {
      console.log(e.data)
      this.port.postMessage('pong')
    }
  }
  process (inputs, outputs, parameters) {
    return true
  }
}
registerProcessor('ping-pong-processor', PingPongProcessor)

Now in our main scripts file we'll load the processor, create an instance of AudioWorkletNode passing the name of the processor, and connect the node to an audio graph.

const audioContext = new AudioContext()
await audioContext.audioWorklet.addModule('ping-pong-processor.js')
const pingPongNode = new AudioWorkletNode(audioContext, 'ping-pong-processor')
// send the message containing 'ping' string
// to the AudioWorkletProcessor from the AudioWorkletNode every second
setInterval(() => pingPongNode.port.postMessage('ping'), 1000)
pingPongNode.port.onmessage = (e) => console.log(e.data)
pingPongNode.connect(audioContext.destination)

This will output "ping" and "pong" strings to the console every second.

规范

规范	状态	注释
Web 音频 API The definition of 'port' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`port`	Chrome 66	Edge 79	Firefox 76	IE 不支持 No	Opera Yes	Safari 不支持 No	WebView Android 66	Chrome Android 66	Firefox Android 不支持 No	Opera Android Yes	Safari iOS 不支持 No	Samsung Internet Android 9.0

图例

完整支持
不支持

另请参阅

元数据

最后修改： Jul 17, 2019

Web 音频 API
AudioWorkletNode
构造函数
1. AudioWorkletNode()
特性
1. onprocessorerror
2. 参数
3. port
Related pages for Web Audio API

在此页

句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题