MediaSource.activeSourceBuffers

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

實驗性質: 這是一個實驗中的功能
此功能在某些瀏覽器尚在開發中,請參考兼容表格以得到不同瀏覽器用的前輟。

activeSourceBuffersMediaSource 介面的唯讀屬性,回傳一個 SourceBufferList 物件,含有在 SourceBuffers 之中的 SourceBuffer 物件子集合—物件的串列提供被選擇的影片軌 (video track), 啟用的音軌 (audio tracks), 以及顯示或隱藏的字軌。

語法

js
var myActiveSourceBuffers = mediaSource.activeSourceBuffers;

回傳值

一個 SourceBufferList

範例

以下的片段基於 Nick Desaulniers 所編纂的簡單範例(觀看實際演示,或者下載原始碼 以利更進一步研究。)

js
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();
      console.log(mediaSource.activeSourceBuffers);
      // will contain the source buffer that was added above,
      // as it is selected for playing in the video player
      video.play();
      //console.log(mediaSource.readyState); // ended
    });
    sourceBuffer.appendBuffer(buf);
  });
};

...

規格

Specification
Media Source Extensions™
# dom-mediasource-activesourcebuffers

相容性表格

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
activeSourceBuffers

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
Partial support
Partial support
No support
No support

相關資料