Intent to Implement and Ship: MediaStreamTrackEvent constructor
Philip Jägenstedt
Contact emails
Spec
https://w3c.github.io/mediacapture-main/#mediastreamtrackevent
Summary
Expose the MediaStreamTrackEvent interface and constructor, so that new MediaStreamTrackEvent('type', { track: aMediaStreamTrack }) works.
Motivation
The MediaStreamTrackEvent interface currently has [NoInterfaceObject], which is why it showed up in Web features in 2 major browser, but not Chrome. The other two are Firefox and Edge. While WebKit has the IDL file it's not enabled in Safari.The constructor isn't really useful, but event interfaces have them.
Interoperability and Compatibility Risk
Improves interop by bringing supporting engines from 2 to 3, and if MediaStream ships in Safari this will come along for the ride.
Compat risk is virtually none. There's little reason to use the constructor at all, and the only (7) results in HTTP Archive are from compiled dart code, which for some reason has a list of event interfaces in one place.
Ongoing technical constraints
None. There was an IDL compiler bug that I had to fix first, and if that is reverted, this constructor will need to be as well.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
OWP launch tracking bug
Link to entry on the feature dashboard
https://www.chromestatus.com/features/5005114376978432
Requesting approval to ship?
Yes.
Chris Harrelson
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TAMURA, Kent
Software Engineer, Google
