[Webkit-unassigned] [Bug 230950] New: Web Audio panner node quality deteriorates over time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230950

            Bug ID: 230950
           Summary: Web Audio panner node quality deteriorates over time
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com
                CC: cdumez at apple.com

Repro URL: https://downloads.scirra.com/labs/bugs/safaripannerquality/

Steps to reproduce: Load the URL, wait for it to finish loading, then when instructed tap the screen to initiate audio playback.
Keep the screen on (e.g. by occasionally touching the screen) and keep the audio playback going for ~5 minutes (when the displayed time reaches ~300 seconds).

Observed result: after some time, the audio quality noticeably deteriorates. This reproduces for me on an iPad Pro with Safari 15, and becomes obvious around the 300 second mark, with clear buzzing/distortion sounds around that time.

Expected result: audio playback quality to remain good throughout.

The demo uses the Web Audio AP, with panner nodes and a listener set up for positioned sounds. (You can hear that each sound is panned to match the location of the square that appears on screen simultaneously.) It appears the audio deterioration is specific to panner nodes.

This demo is made in Construct 3 and the issue was originally reported to us by a Construct 3 user: https://github.com/Scirra/Construct-3-bugs/issues/5063
They state that it did not reproduce in iOS 12, but does in iOS 14.7.1. This means it appears to be a regression. Perhaps this is related to the new standards-complaint non-prefixed Web Audio API that was new in Safari 14.1.

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