Bug 275801 – Distorted audio when using both getUserMedia and AudioWorklet.addModule

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Web Audio

[Logan]

When performing a specific sequence of actions, all WebAudio output is garbled/distorted:

1. Call navigator.mediaDevices.getUserMedia({audio: true})
2. Create an AudioContext
3. Add any audio worklet using audioContext.audioWorklet.addModule

I have created a test case reduction here: https://loganzartman.github.io/ios-safari-webaudio-bug/

In my reproduction the audio worklet does not do anything at all. The OscillatorNode, which is not connected to the worklet in any way, sounds distorted.

Because of that, I think this is distinct from https://bugs.webkit.org/show_bug.cgi?id=251091

Here are some observations:

- Only reproduces on iOS.
- The order of these steps is important. Creating the AudioContext first seems to resolve the issue.
- Both getUserMedia() and addModule() must be called to reproduce the bug.
- The audio worklet does not have to do anything specific to cause the bug.
- It seems to affect all audio output. The OscillatorNode in this example is just for demonstration.

[Alexey Proskuryakov]

I cannot reproduce with iOS 18 beta, so I'm guessing that this is another manifestation of bug 274507. Could you please re-test with either iOS 18 beta 2 or iOS 17.6 beta?

*** This bug has been marked as a duplicate of bug 274507 ***

[Logan]

Thanks, I was using iOS 18 beta 1, but updating to beta 2 seems to have fixed it.