[webkit-dev] Request for position on AudioContext.outputLatency

youenn fablet youennf at gmail.com
Mon Dec 13 01:15:36 PST 2021

Looking at https://www.w3.org/TR/webaudio/#dom-audiocontext-outputlatency,
it states that:
> If the audio output device is changed the outputLatency
<https://www.w3.org/TR/webaudio/#dom-audiocontext-outputlatency> attribute
value will be updated accordingly.

The use case seems ok, but I worry about fingerprinting if it means this
allows a web page to passively identify user speakers.
Say I switch from builtin speakers to Bluetooth headset using MacOS system

If so, the spec should identify this as potential fingerprinting and should
provide mitigations.
And we should evaluate fingerprinting-free alternatives.
What does PING WG think about this?

Le lun. 13 déc. 2021 à 09:39, Yoav Weiss via webkit-dev <
webkit-dev at lists.webkit.org> a écrit :

> (Sent on behalf of Hongchan Choi, who failed to subscribe to this mailing
> list)
> Hey folks!
> AudioContext.outputLatency is to inform the time at which the first sample
> in the buffer is actually processed by the audio output device. This is
> useful when synchronizing the audio generated by Web Audio to other audio
> or video sources or to visual cues [1].
> This is already implemented in FireFox and we're looking to ship it in
> Chrome soon [2][3]. Would you all be interested in this feature?
> Thanks,
> Hongchan
> [1] https://www.w3.org/TR/webaudio/#dom-audiocontext-outputlatency
> [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1324552
> [3]
> https://groups.google.com/a/chromium.org/g/blink-dev/c/dTQniJNVVMY/m/hPFwY1fbBQAJ
> _______________________________________________
> webkit-dev mailing list
> webkit-dev at lists.webkit.org
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