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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

addSourceBuffer() 方法在 MediaSource interface creates a new SourceBuffer 为给定 MIME 类型 and adds it to the MediaSource 's sourceBuffers list. The new SourceBuffer is also returned.

句法

var sourceBuffer = mediaSource.addSourceBuffer(mimeType);
					

参数

mimeType

DOMString specifying the MIME type of the SourceBuffer to create and add to the MediaSource .

返回值

A SourceBuffer object representing the new source buffer that has been created and added to the media source.

异常

InvalidAccessError

The value specified for mimeType is an empty string rather than a valid MIME type.

InvalidStateError

MediaSource is not in the "open" readyState .

NotSupportedError

指定 mimeType isn't supported by the 用户代理 , or is not compatible with the MIME types of other SourceBuffer objects that are already included in the media source's sourceBuffers 列表。

QuotaExceededError

The user agent can't handle any more SourceBuffer objects, or creating a new SourceBuffer 使用给定 mimeType would result in an unsupported configuration of SourceBuffer s .

范例

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

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);
}
function sourceOpen (_) {
  //console.log(this.readyState); // open
  var mediaSource = this;
  var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  fetchAB(assetURL, function (buf) {
    sourceBuffer.addEventListener('updateend', function (_) {
      mediaSource.endOfStream();
      video.play();
      //console.log(mediaSource.readyState); // ended
    });
    sourceBuffer.appendBuffer(buf);
  });
};
					

规范

规范	状态	注释
媒体源扩展 The definition of 'addSourceBuffer()' in that specification.	推荐	初始定义。

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
addSourceBuffer	Chrome 23	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 25	Firefox Android 41	Opera Android 14	Safari iOS 不支持 No	Samsung Internet Android 1.5

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。

另请参阅

• SourceBuffer
• SourceBufferList

元数据

• 最后修改： Jan 31, 2020

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