Thanks for reviewing the intent, Alex. Regarding unified behavior with RTCAudioSourceStats, I don't believe this API serves the same goal. WebAudio’s stats are centered specifically around audio stream quality, so I am unsure about achieving unified behavior across these different APIs.
As for getting similar stats from the <audio> element or WebRTC contexts, both HTMLAudioElement and WebRTC's audio systems are "push-based." By design, they should not experience audio sample dropouts or glitches in the same way. The WebAudio (pull-based) playback stats are specifically designed to catch dropouts so developers can estimate the user's audio quality and experience. Hopefully this answers your question! Best, Hongchan On Mon, Feb 2, 2026 at 12:14 PM Alex Russell <[email protected]> wrote: > Hey Hongchan, > > This looks extremely useful! > > I'm a little surprised to see that the TAG didn't ask about alignment with > other APIs in the space, e.g.: > > https://developer.mozilla.org/en-US/docs/Web/API/RTCAudioSourceStats > > Will we get unified behaviour here? Will it be possible to get similar > stats from an <audio> element or WebRTC contexts, e.g.? > > Best, > > Alex > > On Friday, January 30, 2026 at 7:27:33 AM UTC-8 Chromestatus wrote: > >> *Contact emails* >> [email protected], [email protected], [email protected] >> >> *Explainer* >> https://github.com/WICG/web_audio_playout >> >> *Specification* >> https://webaudio.github.io/web-audio-api/#AudioPlaybackStats >> >> *Summary* >> This feature adds an AudioContext.playbackStats attribute which returns >> an AudioPlaybackStats object. This object provides audio playback >> statistics such as average latency, minimum/maximum latency, underrun >> duration, and underrun count. This API allows web applications to monitor >> audio playout quality and detect glitches. Note: This feature was >> previously tracked as AudioContext.playoutStats. It has been renamed to >> AudioContext.playbackStats to align with the final Web Audio API >> specification. The old name is supported as a deprecated alias for backward >> compatibility. >> >> *Blink component* >> Blink>WebAudio >> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebAudio%22> >> >> *Web Feature ID* >> web-audio <https://webstatus.dev/features/web-audio> >> >> *Motivation* >> There is currently no way to detect whether WebAudio playout has glitches >> (gaps in the played audio, which typically happens due to underperformance >> in the audio pipeline). There is an existing way to measure the >> instantaneous playout latency using AudioContext.outputLatency, but no >> simple way to measure average/minimum/maximum latency over time. With this >> API, we want to propose a way to be able to measure the delay of that audio >> and the glitchiness of the audio. >> >> *Initial public proposal* >> https://github.com/WICG/proposals/issues/142 >> >> *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*: Positive (https://github.com/WebAudio/web-audio-api/pull/2645) The >> spec PR was reviewed and approved by a Mozilla engineer. >> >> *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. >> >> >> *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 >> These will be updated if the API shape changes. >> >> *Flag name on about://flags* >> *No information provided* >> >> *Finch feature name* >> AudioContextPlayoutStats >> >> *Rollout plan* >> Will ship enabled for all users >> >> *Requires code in //chrome?* >> False >> >> *Tracking bug* >> https://g-issues.chromium.org/issues/475838360 >> >> *Launch bug* >> https://launch.corp.google.com/launch/4308993 >> >> *Availability expectation* >> Feature is available only in Chromium browsers for the foreseeable future. >> >> *Adoption expectation* >> Feature is used by specific partner(s) to provide functionality within 12 >> months of launch in Chrome. >> >> *Adoption plan* >> Nothing specific planned. >> >> *Non-OSS dependencies* >> >> Does the feature depend on any code or APIs outside the Chromium open >> source repository and its open-source dependencies to function? >> None. >> >> *Estimated milestones* >> Shipping on desktop 146 >> 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 >> Shipping on Android 146 >> Shipping on WebView 146 >> >> *Anticipated spec changes* >> >> Open questions about a feature may be a source of future web compat or >> interop issues. Please list open issues (e.g. links to known github issues >> in the project for the feature specification) whose resolution may >> introduce web compat/interop risk (e.g., changing to naming or structure of >> the API in a non-backward-compatible way). >> None. >> >> *Link to entry on the Chrome Platform Status* >> https://chromestatus.com/feature/5172818344148992?gate=5078819495215104 >> >> *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 1: >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/691455eb.2b0a0220.e30ce.7e1f.GAE%40google.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 >> <https://chromestatus.com>. >> > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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