[Webkit-unassigned] [Bug 260412] New: Playing audio from a `MediaElementAudioSourceNode` silently fails in the iOS 17 Beta

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260412

            Bug ID: 260412
           Summary: Playing audio from a `MediaElementAudioSourceNode`
                    silently fails in the iOS 17 Beta
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jordan at jordaneldredge.com
                CC: cdumez at apple.com

## Repro

Open the repro link (below) and click “Play”.

**Expected:** An audio sample plays (this happens on iOS 16)

**Actual:** No audio plays (this happens on iOS 17 Beta)

- Repro: [https://captbaritone.github.io/safari-17-element-source-bug/](https://captbaritone.github.io/safari-17-element-source-bug/)
- Repro code: [https://github.com/captbaritone/safari-17-element-source-bug](https://github.com/captbaritone/safari-17-element-source-bug)

### Impact

- This issue was discovered when [webamp.org](http://webamp.org) broke ([issue](https://github.com/captbaritone/webamp/issues/1223))
- The Webamp audio player is also used as an [optional audio player](https://blog.archive.org/2018/10/02/dont-click-on-the-llama/) on the Internet Archive [archive.org](https://archive.org), and the bug manifests there as well
- I’ve also discovered a few other project which worked on Safari 16, but seems to be broken on iOS by this beta release:
    - [https://visicality.derekwolpert.com](https://visicality.derekwolpert.com/) It also uses `MediaElementAudioSourceNode` ([source](https://github.com/derekwolpert/Visicality/blob/25518a682bbbfd55d9abd74fae38f6fce8e158e6/src/index.js#L217))
    - [https://saturn.fm](https://saturn.fm) (sound effects still work, but music does not play)

## Observations

- The issue reproduces on iOS 17.0 (21a5312c)
- The issue does *not* reproduce on iOS 16.3 (20D47)
- The issue does *not* reproduce on Safari 17 on MacOS. Tested on version 17.0 (18616.1.27.101.1, 18616)
- [Some projects](https://github.com/mrdoob/three.js/commit/1c07c8a9868f85f99fb098c82da946e7a7945d07) seem to avoid using `MediaElementAudioSourceNode` on iOS devices, going back to at least May 2020
- There have been a few previous WebKit bugs that look similar: [Bug 211394](https://bugs.webkit.org/show_bug.cgi?id=211394) and [Bug 203435](https://bugs.webkit.org/show_bug.cgi?id=203435)

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