[Webkit-unassigned] [Bug 243260] New: When a bluetooth headset is attached, the internal mic gain is very low

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243260

            Bug ID: 243260
           Summary: When a bluetooth headset is attached, the internal mic
                    gain is very low
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jesmith at kaon.com
                CC: youennf at gmail.com

In Safari 15.6, the internal mic gets very quiet when a bluetooth headset is attached. I've created this simple test page to demonstrate:

https://kaontest.s3.amazonaws.com/mictest/index.html

It starts with the default mic (showing a level meter and a DB estimate). If you click a button to select a different mic, it will reload the page and use that mic instead.

Test 1:

With no bluetooth headset attached, the levels from the internal mic are strong.

Test 2:

Attach a bluetooth headset and reload the page.
Click the button to select the bluetooth headset.
The levels from the headset mic will be strong.
Click the button to select the internal mic.
The levels from the internal mic barely register.

Notes:

- In a video-conferencing application, you can hear that internal mic works. It is just extremely soft.
- I checked that this isn't a system preferences issue; cranking internal mic gain there does not help.
- Using the same test page in Firefox 103, everything works correctly, so this appears to be a Safari issue, not a Mac OS issue

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