在此页

• 句法
• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

MediaSource() constructor of the MediaSource interface constructs and returns a new MediaSource object with no associated source buffers.

句法

var mediaSource = new MediaSource();
					

参数

None.

范例

The following snippet is taken from a simple example written by Nick Desaulniers ( view the full demo live ，或 download the source for further investigation.)

var video = document.querySelector('video');
var assetURL = 'frag_bunny.mp4';
// Need to be specific for Blink regarding codecs
// ./mp4info frag_bunny.mp4 | grep Codec
var mimeCodec = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"';
if ('MediaSource' in window && MediaSource.isTypeSupported(mimeCodec)) {
  var mediaSource = new MediaSource;
  //console.log(mediaSource.readyState); // closed
  video.src = URL.createObjectURL(mediaSource);
  mediaSource.addEventListener('sourceopen', sourceOpen);
} else {
  console.error('Unsupported MIME type or codec: ', mimeCodec);
}
...
					

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
MediaSource() 构造函数	Chrome 31	Edge 12	Firefox 42 42 25 — 42 注意事项 Disabled Limited support to an allowed list of sites, for example YouTube, Netflix, and other popular streaming sites. The limitation was removed when Media Source Extensions was enabled by default in Firefox 42. Disabled preference. To change preferences in Firefox, visit about:config.	IE 11	Opera 15	Safari 8	WebView Android 4.4.3	Chrome Android 33	Firefox Android 41	Opera Android 14	Safari iOS 不支持 No	Samsung Internet Android 2.0

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• SourceBuffer
• SourceBufferList

元数据

• 最后修改： Dec 5, 2019

相关话题

1. Media Source Extensions API
2. MediaSource
3. 构造函数

   1. MediaSource()
4. 特性

   1. activeSourceBuffers
   2. duration
   3. readyState
   4. sourceBuffers
5. 方法

   1. addSourceBuffer()
   2. clearLiveSeekableRange()
   3. endOfStream()
   4. isTypeSupported()
   5. removeSourceBuffer()
   6. setLiveSeekableRange()
6. 继承：

   1. EventTarget
7. Related pages for Media Source Extensions

   1. HTMLVideoElement.getVideoPlaybackQuality()
   2. SourceBuffer
   3. SourceBufferList
   4. TextTrack.sourceBuffer
   5. TrackDefault
   6. TrackDefaultList
   7. URL.createObjectURL()
   8. VideoPlaybackQuality
   9. VideoTrack.sourceBuffer