On Fri, Nov 12, 2021 at 5:33 PM 'Ajay Rahatekar' via blink-dev < blink-dev@chromium.org> wrote:
> Contact emails > > hongc...@chromium.org, ajayrahate...@google.com > > Explainer > > N/A - the specification (W3C Recommendation) is already published. > Regardless, could you add a few sentences explaining what use cases the feature targets and how developers are expected to use it? > > Specification > > https://www.w3.org/TR/webaudio/#dom-audiocontext-outputlatency > > Summary > > AudioContext.outputLatency property is the estimation in seconds of audio > output latency. > > Technically, this is the interval between the time the UA requests the > host system to play a buffer and the time at which the first sample in the > buffer is actually processed by the audio output device. For devices such > as speakers or headphones that produce an acoustic signal, this latter time > refers to the time when a sample’s sound is produced. > > > Blink component > > Blink>WebAudio > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EWebAudio> > > TAG review > > Completed: Web Audio API specification is W3C Recommendation. > Link to the TAG review? > > 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 <miketa...@chromium.org> > > Interoperability and Compatibility > > Gecko: Shipped/Shipping > Link? > > WebKit: No signal > Have we reached out? https://bit.ly/blink-signals > > Web developers: Positive ( > https://github.com/WebAudio/web-audio-api/issues/12) > > Other signals: A WebCodecs demo application needs this feature. > > > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> > ? > > No - this property represents a platform-provided output latency value of > a selected audio device. It does not work properly without an actual audio > device. > I'm guessing it is tested using browser tests or unit tests without an audio device, right? Have y'all filed bugs against WPT to enable testing it similarly? > Flag name > > N/A > > Requires code in //chrome? > > False > > Tracking bug > > http://crbug.com/785409 > > Launch bug > > http://crbug.com/1258109 > > Estimated milestones > > 98 > > > Link to entry on the Chrome Platform Status > > https://chromestatus.com/feature/5682265146261504 > > This intent message was generated by Chrome Platform Status > <https://www.chromestatus.com/>. > > > -- > Ajay Rahatekar | Technical Program Manager | ajayrahate...@google.com | > 650-797-1279 <(650)%20650-797-1279> > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to blink-dev+unsubscr...@chromium.org. > To view this discussion on the web visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHB%2BDAgeEo86rN4TrL4n8DutRczgXAogTwYLTo%2BPZco84aMq%3Dg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHB%2BDAgeEo86rN4TrL4n8DutRczgXAogTwYLTo%2BPZco84aMq%3Dg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfVTyRSTN6vR2jvcjkSih891HyfzmkjUMQ1Doszej8qQSg%40mail.gmail.com.
