MediaSource.activeSourceBuffers
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
MediaSource 接口的只读属性 activeSourceBuffers 返回一个 SourceBufferList 对象，该对象包含了 sourceBuffers 中的 SourceBuffer 对象的子集——提供当前所选的视频轨道、启用的音频轨道和显示或者隐藏的字幕轨道的对象列表。
值
一个 SourceBufferList，包含每个活动轨道的 SourceBuffer 对象。
示例
以下片段基于 Nick Desaulniers 编写的一个简单示例（查看完整的在线演示，或者下载源代码进行进一步研究）。
js
function sourceOpen() {
//console.log(this.readyState); // open
const mediaSource = this;
const sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
fetchAB(assetURL, function (buf) {
sourceBuffer.addEventListener("updateend", () => {
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);
});
}
// …
规范
| Specification |
|---|
| Media Source Extensions™ # dom-mediasource-activesourcebuffers |
浏览器兼容性
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