Bug 295888 – (iOS) getUserMedia() incorrectly emit 'devicechange' listener

• Component: Media
• Status: RESOLVED FIXED

[Ronan Chi]

When I test getUserMedia() API in iOS, it incorrectly emit 'devicechange' listener.
And I call getUserMedia() again in my web app, it will cause <strong>infinite</strong> 'devicechange' listener loop.
It's ok in Chrome or PC Browser.

Online Link: https://bug.qer.im/ios-getUserMedia-incorrectly-emit-devicechange-listener/index.html

```js
navigator.mediaDevices.addEventListener('devicechange', () => {
  requestDevice();
});
async function requestDevice() {
  log('log', 'getUserMedia');
  const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
  stream.getTracks().forEach(track => {
    track.stop();
  });
}
requestDevice();
```

[Ronan Chi]

Created attachment 475973 [details]
Reproduction Code

[Ronan Chi]

*** Bug 295887 has been marked as a duplicate of this bug. ***

[Ronan Chi]

Created attachment 475975 [details]
Reproduction Video

[Ronan Chi]

Created attachment 475976 [details]
Reproduction Video 2

[Radar WebKit Bug Importer]

<rdar://problem/156311847>

[youenn fablet]

I am able to reproduce.
It appears that stopping the tracks triggers the devicechange event, I am not yet sure why: https://codepen.io/youennf/pen/ogjYjZP
Also, it appears that the devicechange event is fired twice after getUserMedia({audio:true}) while it should be fired only once I think.

[youenn fablet]

Pull request: https://github.com/WebKit/WebKit/pull/48716

[EWS]

Committed 298074@main (913a59298c3e): <https://commits.webkit.org/298074@main>

Reviewed commits have been landed. Closing PR #48716 and removing active labels.