AudioContext.createMediaStreamTrackSource()

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草案
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createMediaStreamTrackSource() 方法在 AudioContext interface creates and returns a MediaStreamTrackAudioSourceNode which represents an audio source whose data comes from the specified MediaStreamTrack .

This differs from createMediaStreamSource() , which creates a MediaStreamAudioSourceNode whose audio comes from the audio track in a specified MediaStream whose id is first, lexicographically (alphabetically).

句法

var audioCtx = new AudioContext();
var track = audioCtx.createMediaStreamTrackSource(track);

参数

track: MediaStreamTrack to use as the source of all audio data for the new node.

返回值

A MediaStreamTrackAudioSourceNode object which acts as a source for audio data found in the specified audio track.

范例

在此范例中， getUserMedia() is used to request access to the user's microphone. Once that access is attained, an audio context is established and a MediaStreamTrackAudioSourceNode is created using createMediaStreamTrackSource() , taking its audio from the first audio track in the stream returned by getUserMedia() .

Then a BiquadFilterNode is created using createBiquadFilter() , and it's configured as desired to perform a lowshelf filter on the audio coming from the source. The output from the microphone is then routed into the new biquad filter, and the filter's output is in turn routed to the audio context's destination .

navigator.mediaDevices.getUserMedia ({audio: true, video: false})
.then(function(stream) {
  audio.srcObject = stream;
  audio.onloadedmetadata = function(e) {
    audio.play();
    audio.muted = true;
  };
  let audioCtx = new AudioContext();
  let source = audioCtx.createMediaStreamSource(stream);
  let biquadFilter = audioCtx.createBiquadFilter();
  biquadFilter.type = "lowshelf";
  biquadFilter.frequency.value = 3000;
  biquadFilter.gain.value = 20;
  source.connect(biquadFilter);
  biquadFilter.connect(audioCtx.destination);
})
.catch(function(err) {
  // Handle getUserMedia() error
});

规范

规范	状态	注释
Web 音频 API The definition of 'createMediaStreamTrackSource()' 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
`createMediaStreamTrackSource`	Chrome 不支持 No	Edge 不支持 No	Firefox 68 注意事项 68 注意事项 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 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android 不支持 No	Chrome Android 不支持 No	Firefox Android 68 注意事项 68 注意事项 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 不支持 No	Safari iOS 不支持 No	Samsung Internet Android 不支持 No

图例

完整支持
不支持

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元数据

最后修改： Jun 24, 2019

Web 音频 API
AudioContext
构造函数
1. AudioContext()
特性
1. baseLatency
2. outputLatency
方法
1. baseLatency
2. close()
3. ~~createJavaScriptNode()~~
4. createMediaElementSource()
5. createMediaStreamDestination()
6. createMediaStreamSource()
7. createMediaStreamTrackSource()
8. ~~createWaveTable()~~
9. getOutputTimestamp()
10. outputLatency
11. resume()
12. suspend()
继承：
1. EventTarget
Related pages for Web Audio API

在此页

句法

参数

返回值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题