Open Bug 1541425 Opened 1 year ago Updated 2 months ago

Implement audio capture for getDisplayMedia


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

66 Branch




(Reporter: wilhelm.wanecek, Unassigned)


User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

Attempted requesting screen capture with audio constraints, e.g. { video: true, audio: true }.

Actual results:

No audio tracks are obtained (i.e. MediaStream#getAudioTracks() returns an empty list), since the feature is not implemented yet.

Expected results:

Firefox should implement the part of the Screen Capture specification[1] describing audio capture. AFAIU, Chromium will implement this as of Chrome 68 [2]. There's some discussion about this feature-set in bug #1321221 [3].

Type: defect → task
Component: Untriaged → WebRTC: Audio/Video
Product: Firefox → Core

Can you help me triage this one?

Flags: needinfo?(jib)

I think this is low priority for us at the moment. This is a MAY in the spec, i.e. it's not mandatory to implement, so we are spec compliant without this feature.

While we do have some old disabled audio-capture code in the tree that we might be able to revive from the Firefox Hello days, I believe that code specifically exposed tab audio, and we don't currently expose tab sharing, which is what it was designed to go along with.

Flags: needinfo?(jib)
Priority: -- → P3
Ever confirmed: true
Type: task → enhancement

Ok, thanks a lot for explaining the situation :) Chromium is in different position since they already had audio capture in their previous, non-standard implementation (although only for tabs on Mac & Linux).

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