[Webkit-unassigned] [Bug 218012] Audio Volume reduces considerably on accepting the mic permissions.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218012

:fippo <philipp.hancke at googlemail.com> changed:

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--- Comment #7 from :fippo <philipp.hancke at googlemail.com> ---
I can reproduce quite reliably after finding out they key is rotating the device somehow.
I can reproduce on an iphone SE (2020) and both in iOS 14.1 and 14.2. Upgrading to 14.2 caused a (hopefullly) unrelated webaudio issue which makes the audio stutter for several seconds.

The minimal sample is at https://fippo.github.io/htmlthings/aadz4a.html
It plays a constant tone using webaudio and visualizes the audio level webrtc sees.

Steps to reproduce low audio volume:
1/ open Safari, put into portrait mode
2/ put phone on the desk, do not hold it
3/ open https://fippo.github.io/htmlthings/aadz4a.html
4/ click "play noise" button. This emits a constant tone.
5/ click "request getusermedia" button. Audio volume usually increases. Note that the graph which shows the audio level webrtc computes stays at 1.0
6/ reload, pick up phone, rotate to portrait mode, put phone on the desk
7/ click "play noise" button. This emits a constant tone roughly the same volume as in step 4.
8/ click "request getusermedia" button". Audio volume drops considerably. Note that the graph which shows the audio level webrtc computes stays at 1.0

For extra fun, continue testing:
9/ pick up phone, put in portrait mode, put down phone
10/ reload
11/ click "play noise" button followed by getUserMedia button
12/ Observe low volume

For even more fun, kill safari, then repeat but starting from landscape mode and switch to portrait mode.

https://bugs.webkit.org/show_bug.cgi?id=198545#c29 suggests rotation fixes *some* issue.
This sounds like some kind of "audio ducking" issue.
This is not detectable from what I can see.

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