USB microphones with FreeBSD-CURRENT

[Graham Perrin]

I can't get web browsers to recognise USB microphones.

USB output (e.g. to my headphones) is OK.

USB input (e.g. from the microphone part of the headphones) is not.

Any suggestions?

 From <https://redd.it/fmwy9x>:

grahamperrin at momh167-gjp4-8570p:~ % date ; uname -v
Sun 22 Mar 2020 08:49:07 GMT
FreeBSD 13.0-CURRENT #0 r359068: Wed Mar 18 21:14:12 GMT 2020 
root at momh167-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
grahamperrin at momh167-gjp4-8570p:~ % cat /dev/sndstat
Installed devices:
pcm0: <ATI R6xx (HDMI)> (play)
pcm1: <IDT 92HD81B1X (Analog 2.0+HP/2.0)> (play/rec)
pcm2: <IDT 92HD81B1X (Analog)> (play/rec)
pcm3: <USB audio> (play/rec) default
pcm4: <USB audio> (rec)
No devices installed from userspace.
grahamperrin at momh167-gjp4-8570p:~ % sysctl hw.snd.default_unit
hw.snd.default_unit: 3
grahamperrin at momh167-gjp4-8570p:~ % pkg query '%o %v %R' firefox
www/firefox 74.0_5,1 FreeBSD
grahamperrin at momh167-gjp4-8570p:~ %