On 11/15/21 10:56 AM, Hongchan Choi wrote:
On Mon, Nov 15, 2021 at 6:49 AM Mike Taylor <miketa...@chromium.org>
wrote:
On 11/15/21 1:47 AM, Yoav Weiss wrote:
On Fri, Nov 12, 2021 at 5:33 PM 'Ajay Rahatekar' via blink-dev
<blink-dev@chromium.org> wrote:
TAG review status
Completed: Web Audio API specification is W3C Recommendation.
Risks
There is a risk of the feature being used for fingerprinting.
However outputLatency is the buffer size of the
platform-provided audio callback, so the value is inherently
platform-specific. That said, the majority of the platform
audio buffer size is widely known. (MacOS = 128 frames,
Windows = 10ms, Android = 96 frames, etc)
This feature does not expose more than what you can
query/infer from the UA string.
Would that exposure map cleanly to UA-Platform
<https://wicg.github.io/ua-client-hints/#sec-ch-ua-platform>,
which is considered low-entropy and exposed by default? Or would
it add more than that?
/cc +Mike Taylor <mailto:miketa...@chromium.org>
Looking at
https://www.w3.org/TR/webaudio/#dom-audiocontext-outputlatency, it
states that it depends on the platform _and_ the hardware output
device. If I use an app using outputLatency with speaker A, then
switch to speaker B, will the outputLatency remain the same?
The specification says: If the audio output device is changed the
outputLatency attribute value will be updated accordingly.
So the answer is no. The value will change accordingly.
If that's the case, then outputLatency can reveal more entropy than just
platform alone, right? It would be useful to know what this looks like
in practice, or what mitigations we might be able to apply depending on
the size of these latency differences.
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