[Webkit-unassigned] [Bug 213723] New: Echo cancellation doesn't work in WebRTC calls when using external microphone

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213723

            Bug ID: 213723
           Summary: Echo cancellation doesn't work in WebRTC calls when
                    using external microphone
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mawojtcz at cisco.com
                CC: youennf at gmail.com

Steps to reproduce:

1. Connect a usb microphone (or a webcam with a microphone) to a Macbook
2. Use Cisco Meeting WebRTC app to join a call with Safari

Expected behaviour:
There should be no echo

Actual behaviour:
All other participants can hear an echo - basically the echo cancellation on Safari when using external microphone is not working correctly.

Further info:
We've double checked that the echo cancellation is enabled on the audio track. The same call works perfectly fine when using Chrome with the same equipment and our app, so it does seem that it's a Safari/Webkit issue. Also it seems to work fine on Safari when using internal microphone.

If you contact me directly I can provide a link to reproduce the issue with the Cisco WebRTC app.

The usb webcam with microphone that I was using in testing is Microsoft Lifecam HD-3000.

Same issue exists in Safari Technology Preview.

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