821306 - Expose nsIMediaDevice.id to script

Status: RESOLVED FIXED

(Core :: WebRTC, defect)

Description

[(not currently active) Ted Mielczarek]

Not sure if this actually belongs in the DOM component. Currently MediaDevices have an ID attached, but it's not script-exposed. I'd like to be able to get at this from code with chrome privileges so that we can usefully select the correct device for unit tests.

Comment 1

[(not currently active) Ted Mielczarek]

Attachment: Expose nsIMediaDevice.id to script

Comment 2

[Johnny Stenback (:jst)]

Jesup, is this something we want to expose to webpages, and thus spec etc? If not, we should find a way to expose this only to chrome. That'll be easy down the road, but a bit tricky as of right now given how the media stuff is exposed to JS.

Comment 3

[(not currently active) Ted Mielczarek]

I didn't know it was possible for content to get a hold of these at all, honestly. I don't see anywhere that they're exposed, and there's no classinfo for it.

Comment 4

[Randell Jesup [:jesup] (needinfo me)]

jst: I don't think the spec speaks to this directly.  However, it's possible that as part of the 'constraints' that are given to getUserMedia it could include the 'id' of a device it was using last time as the preferred default device.  The WG has talked about this only in generalities so far (no real attention), saying they'd be selected by asking for front, back, etc.  But we realize on many systems there's no such labeling available.  This would allow an app to adjust to the household.

Comment 5

[(not currently active) Ted Mielczarek]

Can anyone answer my question in comment 3? Is it possible for content script to get to these objects? I don't see any interfaces that expose them, and they're not in domclassinfo.

Comment 6

[Johnny Stenback (:jst)]

Comment on attachment 691813 [details] [diff] [review]
Expose nsIMediaDevice.id to script

Ted's right, there's no way to reach these from content code, the only way that I know of is to call mozGetUserMediaDevices() passing in a callback and once the callback is called, it will be handed references to media device objects. But  mozGetUserMediaDevices() is only callable from chrome...

Comment 7

[(not currently active) Ted Mielczarek]

https://hg.mozilla.org/integration/mozilla-inbound/rev/fd40e91ec703

Comment 8

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/fd40e91ec703