[Webkit-unassigned] [Bug 199674] New: AudioContext audio level reported as zero when tab loses and regains focus

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199674

            Bug ID: 199674
           Summary: AudioContext audio level reported as zero when tab
                    loses and regains focus
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Kongpheng.Nanthavongsa at vonage.com

In desktop Safari 12, the audio levels reported by the analyzer (via getByteTimeDomainData) remain stuck at zero when the focus shifts to another tab and returns to the original tab.  Sample code here: https://codepen.io/v-kpheng/pen/EBGreB.

To reproduce:
* Open link in Safari
* Notice that audio level changes
* In another tab, visit another site and click on an area on the site
* Go back to the original tab
* Notice that the audio level doesn't change anymore and it stuck at 0

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