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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 Web Feature ID No information provided 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 No information provided 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? No information provided Goals for experimentation No information provided Reason this experiment is being extended Since the previous extension, we have presented the API to the Audio WG, where it was agreed that we should land the API in the WebAudio spec. The PR[1] has had a number of rounds of review, and is now close to landing (as discussed at TPAC 2025) [2]. Since the requested changes to the API include naming changes, applications using the Origin Trial version of the API will not be compatible with the new version of the API out of the box. To give us time to land the spec and to give applications time to migrate to the new version, we are requesting an extension of 3 milestones until 145. [1] https://github.com/WebAudio/web-audio-api/pull/2645 [2] https://docs.google.com/document/d/15bLL2UujSW4OdSa0Kv66wziXBTq34jWOntNDbs2pPek/edit?tab=t.dpp97ymwtdhx#heading=h.m9ld885gturz Reason this experiment is being extended Since the last extension, the Privacy WG have reviewed the API, and noted some security concerns[1]. We have discussed them and agreed on a set of mitigations, given which the Privacy WG have indicated that they will approve the API[2]. If you don't have access to the slack thread, you can read the relevant messages here (shared with Blink API-owners)[3] We have updated the spec with a formal algorithm which includes the mitigations as well as a Privacy & Security considerations section discussing the concerns. [4] We are requesting this Origin Trial extension to give us time to get the Privacy WG's final approval on the new version of the spec, and present it to the Audio WG (who are positive towards the API when it was presented at TPAC but want approval from the Privacy WG before adopting it). [1] https://github.com/WICG/web_audio_playout/issues/4 [2] https://w3ccommunity.slack.com/archives/C06BB1JR528/p1747683821732619?thread_ts=1744909746.069129&cid=C06BB1JR528 [3] https://docs.google.com/document/d/1Mg-O-YX4xiFJ2qtvjRDL_F5SbKf74TJFYYQnTCE5QrU/edit?tab=t.0 [4] https://wicg.github.io/web_audio_playout/ 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? Yes 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 No information provided 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 145 Origin trial extension 2 end milestone 142 Origin trial extension 3 end milestone 139 DevTrial on desktop 129 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5172818344148992?gate=6552352408600576 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 Intent to Extend Experiment 2: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/686d135c.2b0a0220.3a1521.0081.GAE%40google.com Intent to Extend Experiment 3: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACazmWVkWb8DJM_aCRGOFpskBs-7h%3DO_yggKc3YBUkiieEO-UA%40mail.gmail.com This intent message was generated by Chrome Platform Status. -- 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 [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/691455eb.2b0a0220.e30ce.7e1f.GAE%40google.com.
