MediaSource: activeSourceBuffers property
Note: This feature is available in Dedicated Web Workers.
The activeSourceBuffers
read-only property of the
MediaSource
interface returns a SourceBufferList
object
containing a subset of the SourceBuffer
objects contained within
sourceBuffers
— the list of objects
providing the selected video track, enabled audio tracks, and shown/hidden text tracks.
Value
A SourceBufferList
containing the SourceBuffer
objects
for each of the active tracks.
Examples
The following snippet is based on a simple example written by Nick Desaulniers (view the full demo live, or download the source for further investigation). The function getMediaSource()
, which is not defined here, returns a MediaSource
.
js
const mediaSource = getMediaSource();
function sourceOpen() {
console.log(mediaSource.readyState); // open
const sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
fetchAB(assetURL, (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);
});
}
// …
Specifications
Specification |
---|
Media Source Extensions™ # dom-mediasource-activesourcebuffers |
Browser compatibility
BCD tables only load in the browser