[WebRTC] Voice device does not switch until Speak is turned off.

[Dan-Linden]

Environment

Full Environment

Second Life Test 7.2.3.18810343522 (64bit)
Release Notes

You are at 222.1, 24.8, 26.7 in Bug Island located at simhost-0f340ca0324a590c7.agni
SLURL: http://maps.secondlife.com/secondlife/Bug%20Island/222/25/27
(global coordinates 260,318.0, 249,369.0, 26.7)
Second Life Preflight 2025-09-26.18046863877
Release Notes

CPU: Intel(R) Core(TM) i9-14900HX (2419.2 MHz)
Memory: 32472 MB
OS Version: Microsoft Windows 11 64-bit (Build 26200.6899)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA GeForce RTX 4080 Laptop GPU/PCIe/SSE2

Windows Graphics Driver Version: 32.0.15.8129
OpenGL Version: 4.6.0 NVIDIA 581.29

Window size: 2560x1369
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
Bandwidth: 10000kbit/s
LOD factor: 1.5
Render quality: 4
Texture memory: 12282MB
Disk cache: Max size 3494.4 MB (13.4% used)

J2C Decoder Version: KDU v8.4.1
Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.24.2 / OpenAL Community / OpenAL Soft: OpenAL Soft
Dullahan: 1.24.0.202510081738
CEF: 139.0.40+g465474a+chromium-139.0.7258.139
Chromium: 139.0.7258.139
LibVLC Version: 3.0.21
Voice Server Version: Secondlife WebRTC Gateway

Packets Lost: 0/332 (0.0%)
October 27 2025 15:16:42

Description

[WebRTC] Voice device does not switch until Speak is turned off.

Reproduction steps

1. On a Windows laptop that has integrated mic and speakers. (This may repro on other configurations)
2. Unplug any headset.
3. Log into a WebRTC region with the 7.2.3.18810343522 test viewer.
4. Click the Speak button and verify with an observer that you are transmitting voice.
5. Plug in a USB headset
6. Tap the headset mic and verify that the tapping is heard.

Observed: The audio was still transmitted from the integrated mic.

Log file: device didn't switch when USB headset was plugged in SecondLife.log

Expected: The audio should switch when the USB headset is plugged in.

Workaround: Turn the Speak button off then on.

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[Dan-Linden]

Test on vivox and see if it repros there.

[akleshchev]

I tried just force stopping recording and starting it again from a worker thread, multiple variants of it (like resetting mic's gain) but unfortunately nothing worked (ex: webrtc reports that mic is working yet it isn't), so there is no simple solution.