MediaStreamAudioSourceNode()

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Web 音频 API 's MediaStreamAudioSourceNode() constructor creates and returns a new MediaStreamAudioSourceNode object which uses the first audio track of a given MediaStream as its source.

注意： Another way to create a MediaStreamAudioSourceNode is to call the AudioContext.createMediaStreamSource() method, specifying the stream from which you want to obtain audio.

句法

audioSourceNode = new MediaStreamAudioSourceNode(context, options);

参数

context: AudioContext representing the audio context you want the node to be associated with.
选项

mediaStream: A required property which specifies the MediaStream from which to obtain audio for the node.

返回值

新的 MediaStreamAudioSourceNode object representing the audio node whose media is obtained from the specified source stream.

异常

InvalidStateError: 指定 MediaStream doesn't have any audio tracks.

范例

此范例使用 getUserMedia() to obtain access to the user's camera, then creates a new MediaStreamAudioSourceNode 从其 MediaStream .

// define variables
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
// getUserMedia block - grab stream
// put it into a MediaStreamAudioSourceNode
if (navigator.mediaDevices.getUserMedia) {
   navigator.mediaDevices.getUserMedia (
      // constraints: audio and video for this app
      {
         audio: true,
         video: false
      }).then(function(stream) {
        var options = {
          mediaStream : stream
        }
        var source = new MediaStreamAudioSourceNode(audioCtx, options);
        source.connect(audioCtx.destination);
      }).catch(function(err) {
       console.log('The following gUM error occured: ' + err);
      });
} else {
  console.log('new getUserMedia not supported on your browser!');
}

规范

规范	状态	注释
Web 音频 API The definition of 'MediaStreamAudioSourceNode()' 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
`MediaStreamAudioSourceNode()` 构造函数	Chrome 55 55 Before Chrome 59, the default values were not supported.	Edge ≤79	Firefox 53	IE No	Opera 42	Safari ?	WebView Android 55 55 Before Chrome 59, the default values were not supported.	Chrome Android 55 55 Before Chrome 59, the default values were not supported.	Firefox Android 53	Opera Android 42	Safari iOS ?	Samsung Internet Android 6.0 6.0 Before Samsung Internet 7.0, the default values were not supported.

图例

完整支持
不支持
兼容性未知 ?

元数据

最后修改： Nov 5, 2019

Web 音频 API
MediaStreamAudioSourceNode
构造函数
1. MediaStreamAudioSourceNode()
继承：
1. AudioNode
2. EventTarget
Related pages for Web Audio API

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句法

参数

返回值

异常

范例

规范

浏览器兼容性

图例

相关话题