[Webkit-unassigned] [Bug 211394] New: createMediaElementSource not working

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211394

            Bug ID: 211394
           Summary: createMediaElementSource not working
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: luigi at luigipulcini.com

This bug seems to be related to the previous bug #203435, which is currently reported as RESOLVED FIXED.

We asked every user we could get in touch with to test the following player on their iOS devices. Not a single one of the visitors using a device with iOS 13, including the ones who upgraded to the recent iOS 13.4.1, managed to see the player playing back the audio track. The player is stuck as soon as the user hits the play button. No warnings or errors are reported in the browser console.
https://www.staging2.waveplayer.info/

The player uses the `createMediaElementSource` WebAudio function to connect an HTML5 Audio Element as a source for an Analyzer Node so that the audio file can be analyzed and a waveform animated using the Frequency Data coming from the source can be rendered in the player canvas.

Currently, the only alternative we could find is a fallback to the regular Audio Element for all the iOS 13 visitors. A solution that excludes them from seeing the waveform animations.

Please note that this has been working just fine on any other recent versions of iOS until iOS 13 came out.

If needed, I can provide further details about the player.

Thanks.

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