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[mediacapture-main] Redefine groupId to be more narrow and useful (#899)

From: Jan-Ivar Bruaroey via GitHub <sysbot+gh@w3.org>
Date: Mon, 22 Aug 2022 21:45:08 +0000
To: public-webrtc@w3.org
Message-ID: <issues.opened-1347024442-1661204706-sysbot+gh@w3.org>
jan-ivar has just created a new issue for https://github.com/w3c/mediacapture-main:

== Redefine groupId to be more narrow and useful ==
The undisputed use case for [groupId](https://w3c.github.io/mediacapture-main/#dom-mediadeviceinfo-groupid) is to find devices a user might want to use together in a video call. E.g. [headset switching](https://jsfiddle.net/jib1/yvj4narc/).

But the current definition: _"Two devices have the same group identifier if they belong to the same physical device"_, is too broad.

Because on linux, Firefox exposes virtual microphones from monitored output devices, with matching groupId (behind a pref). But using these together (in a video call or anywhere else) would always be a mistake as it short-circuits.

I propose we redefine it to: _"Two devices have the same group identifier if they belong to the same physical device, and are useful together in a video conferencing call."_

Happy to bikeshed.

Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/899 using your GitHub account


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