[Webkit-unassigned] [Bug 213390] New: On-screen volume controls do not work when microphone is active

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213390

            Bug ID: 213390
           Summary: On-screen volume controls do not work when microphone
                    is active
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dustin.greif at gmail.com

In iOS safari, if a web page has both audio playing and a microphone active, the on-screen volume controls do not work.  You can control the volume with the hardware buttons on the side of the iPad, but not with the software volume slider that is accessible by pulling down from the top right corner of the screen.  If the microphone is not active, the on-screen volume control works fine.  It seems like the iPad is switching audio codecs when the microphone is started (something like when AirPods switch to SCO when their mic is activated), and this second codec has its own separate volume level that is only controlled by the hardware volume buttons.  Here is a codepen which demonstrates the issue:

https://codepen.io/dgreif/pen/pogRJBg

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