1541471 - Implement spec-compliant `HTMLMediaElement`.captureStream

Status: NEW

(Core :: Audio/Video: MediaStreamGraph, enhancement, P3)

Description

[Paul Adenot (:padenot)]

We have old and incorrect (per-spec) mozCaptureStream and mozCaptureStreamUntilEnded, that we should adjust and rename to be spec-compliant.

Comment 2

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Fixing title because captureStreamUntilEnded was removed from the spec, since it is trivial to emulate with

video.onended = () => track.stop();

Comment 3

[Andreas Pehrson [:pehrsons]]

(In reply to Jan-Ivar Bruaroey [:jib] (needinfo? me) from comment #2)

Fixing title because captureStreamUntilEnded was removed from the spec, since it is trivial to emulate with

video.onended = () => track.stop();

Well, if the video element ended, there wouldn't be any live track left to stop. If you wanted to cancel the capturing you could probably do something with GC of the MediaStream that was returned from captureStream.

I think the safest way to emulate captureStreamUntilEnded would be to stop using the captured media element and replace it with a pristine one.

Comment 6

[Byoungchan Lee]

Even in some code of webgpu tests check if HTMLMediaElement.captureStream is implemented or not.

https://searchfox.org/mozilla-central/source/testing/web-platform/mozilla/tests/webgpu/webgpu/web_platform/util.js#463
https://github.com/gpuweb/cts/blob/b0f5b1839f40f8f793ec2e4a6eecae41a273e0b3/src/webgpu/web_platform/util.ts#L463