web,video: Add H264 decoding using the WebCodecs API #16794
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Rebased on top of #17878. |
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A continuation of #14654.
Not really done yet, just pushing for visibility, and so that it doesn't get forgotten.
(Just look at the commit history lol.)Due to this API being based on callbacks, this currently adds at least one additional (video) frame of delay as compared to a synchronous decoder, such as OpenH264 on desktop. I think this should be acceptable.
It would be possible to wire the callback straight from the browser through the video backend to the renderer backend, to update the texture immediately (off the regular frame pacing schedule), but I think that would be a bit too complicated, and could potentially result in less smooth playback.
Mostly works, in Chrome and in Firefox 129+.
I don't think this could be problematic at all from a patents/licensing/royalty standpoint.
Advances #8891.