Thanks for the updates on progress.
LGTM to extend from M137 to M139 inclusive.
On 5/9/25 10:27 AM, 'Fredrik Hernqvist' via blink-dev wrote:
Contact emails
fhernqv...@google.com, o...@google.com, hongc...@google.com,
agpa...@google.com, gui...@google.com
Explainer
https://github.com/WICG/web_audio_playout
Specification
https://wicg.github.io/web_audio_playout
Summary
The AudioContext.playoutStats API allows an application to measure the
quality and latency of audio playout using WebAudio.
Blink component
Blink>WebAudio
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebAudio%22>
TAG review
Early TAG review request:
https://github.com/w3ctag/design-reviews/issues/939
TAG review status
Issues addressed
Origin Trial Name
Playout Statistics API for WebAudio
Chromium Trial Name
AudioContextPlayoutStats
Origin Trial documentation link
https://github.com/WICG/web_audio_playout
WebFeature UseCounter name
kAudioContextPlayoutStats
Risks
Interoperability and Compatibility
None
/Gecko/: No signal
/WebKit/: No signal
/Web developers/: Positive
(https://github.com/WICG/proposals/issues/142#issuecomment-1981012486)
/Other signals/:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
None
Goals for experimentation
Reason this experiment is being extended
We need additional time to work with Privacy WG to address their
concerns. Since the origin trial started, we have made the following
progress: * The API was presented at TPAC, and got a positive reaction
from Audio WG. However, they wanted to hear the Privacy WG's input,
and that we should ask the internal privacy/security reviewers why the
API is ok while the similar RenderCapacity API was not ok. (
https://docs.google.com/document/d/1QiBmVZb51ATyai_TTbkMnq25zaQOzVNxNIsPJZ8sdUE/edit?tab=t.0#heading=h.el9c5z4prh05
) * We have presented the API to the Privacy WG and they have
discussed it
(https://github.com/w3c/privacywg/blob/main/minutes/privacywg-20250417.md#webaudio)
. We are now having an active discussion with them about how we can
address their concerns. * Google-internal privacy/security reviewers
have reaffirmed that the API is ok, and safer than the RenderCapacity
API. * We have added wpt tests for the API.
Ongoing technical constraints
None.
Debuggability
Can be tested by creating an AudioContext and evaluating
context.playoutStats in the console.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
https://wpt.fyi/results/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-playoutstats.html?label=experimental&label=master&aligned
<https://wpt.fyi/results/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-playoutstats.html?label=experimental&label=master&aligned>
These will be updated if the API shape changes.
Flag name on about://flags
None
Finch feature name
AudioContextPlayoutStats
Requires code in //chrome?
False
Estimated milestones
Origin trial desktop first 131
Origin trial desktop last 136
Origin trial extension 1 end milestone 139
DevTrial on desktop 129
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5172818344148992?gate=5074057867034624
Links to previous Intent discussions
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACazmWW4MYVa_iGjN%3DK4O9B1DE3rt4_2Vkqnq6sKswHFjn6BzQ%40mail.gmail.com
Intent to Experiment:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACazmWWV6S6Ba%3Dd%3DgvjhERm1OnPyBMRJx5fbkP%3Df9zb3k%3DrNDA%40mail.gmail.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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