Select audio and video source fails silently on Chrome/Android for external USB device

[mlnoga]

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• [x ] I have provided steps to reproduce
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Browser affected

Chrome 96.0.4664.45 on Android 11

Description

While external USB audio devices can be enumerated, selecting them fails silently and defaults back to the internal microphone.

Steps to reproduce

Plug in an external class compliant USB audio device
Open the example https://webrtc.github.io/samples/src/content/devices/input-output/
Click on USB audio as the input source.
Tap the internal microphone.
Then cause the USB audio device to transfer sound (eg hit play).

Expected results

The audio output should be silent when tapping the internal mike, and should play back the external sound.

Actual results

The opposite is true.

[Astagor]

I have the same issue, Chrome 104.0.5112.97, Android 12. I have tested with https://webrtc.github.io/samples/src/content/devices/input-output/ and in Chrome audio inputs are listed as outputs and outputs as inputs. So I get as input:

• Standard
• Speakerphone
• Headset earpiece

As output I get:

• Standard

On the same phone in FireFox it works OK. Of course, I cannot choose output as FF does not support it, but the input just lists Standard, as it should.

[Astagor]

I do nothing special, I open the webrtc sample page and the inputs and outputs are switched.