MediaStreamTrackAudioSourceNode()

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Web 音频 API 's MediaStreamTrackAudioSourceNode() constructor creates and returns a new MediaStreamTrackAudioSourceNode object whose audio is taken from the MediaStreamTrack specified in the given options object.

Another way to create a MediaStreamTrackAudioSourceNode is to call the AudioContext.createMediaStreamTrackSource() method, specifying the MediaStreamTrack from which you want to obtain audio.

句法

audioTrackNode = new MediaStreamTrackAudioSourceNode(context, options);

参数

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

mediaStreamTrack: MediaStreamTrack from which to take audio data for this node's output.

返回值

新的 MediaStreamTrackAudioSourceNode object representing the audio node whose media is obtained from the specified media track.

异常

NotSupportedError: 指定 context is not an AudioContext .
InvalidStateError: 指定 MediaStreamTrack isn't an audio track (that is, its kind property isn't audio .

范例

此范例使用 getUserMedia() to obtain access to the user's camera, then creates a new MediaStreamAudioSourceNode from the first audio track provided by the device.

let audioCtx = new (window.AudioContext || window.webkitAudioContext)();
if (navigator.mediaDevices.getUserMedia) {
  navigator.mediaDevices.getUserMedia (
    {
      audio: true,
      video: false
    }).then(function(stream) {
      let options = {
        mediaStreamTrack: stream.getAudioTracks()[0];
      }
      let source = new MediaStreamTrackAudioSourceNode(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 'MediaStreamTrackAudioSourceNode()' 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
`MediaStreamTrackAudioSourceNode()` 构造函数	Chrome No	Edge No	Firefox 68 68 Firefox 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 68 68 Firefox 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.	Opera Android No	Safari iOS No	Samsung Internet Android No

图例

完整支持
不支持

元数据

最后修改： Jun 24, 2019

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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

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