[Bug 203745] A2DP Support for Bluetooth Headphone Audio

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 11 Dec 2021 05:10:31 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203745

--- Comment #65 from Alexey Dokuchaev <danfe@FreeBSD.org> ---
(In reply to Hans Petter Selasky from comment #64)
> usage: virtual_oss_ctl -f /dev/vdsp.ctl
> 
> Then you can change the volume and do some other stuff as needed.
Thanks, that helped indeed!  It's a tad inconvenient that there's no one big
master volume knob, one can only adjust Ch0 and Ch1 separately.  But with that
tool I can finally start using a BT speaker without hardware volume buttons and
not waking up all neighbors. :-)

> Virtual OSS also supports the volume IOCTLs on the dsp devices, but these
> must be invoked from the application itself.
Interesting: I can adjust volume in mpg123, but not in MPlayer for some reason.
 Need to check which IOCTLs exactly both are using.

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