usr.sbin/mixer/mixer.8

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.\" $FreeBSD$
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.Dd March 18, 2022
.Dt MIXER 8
.Os
.Sh NAME
.Nm mixer
.Nd manipulate soundcard mixer controls
.Sh SYNOPSIS
.Nm
.Op Fl f Ar device
.Op Fl d Ar unit
.Op Fl os
.Op Ar dev Ns Op Cm \&. Ns Ar control Ns Op Cm \&= Ns Ar value
.Ar ...
.Nm
.Op Fl d Ar unit
.Op Fl os
.Fl a
.Nm
.Fl h
.Sh DESCRIPTION
The
.Nm
utility is used to set and display soundcard mixer device controls.
.Pp
The options are as follows:
.Bl -tag -width "-f device"
.It Fl a
Print the values for all mixer devices available in the system
.Pq see Sx FILES .
.It Fl d Ar unit
Change the default audio card to
.Ar unit .
The unit has to be an integer value.
To see what unit values are available, look at the number each mixer device has by running
.Nm .
.It Fl f Ar device
Open
.Ar device
as the mixer device
.Pq see Sx FILES .
.It Fl h
Print a help message.
.It Fl o
Print mixer values in a format suitable for use inside scripts.
The mixer's header (name, audio card name, ...) will not be printed.
.It Fl s
Print only the recording source(s) of the mixer device.
.El
.Pp
The list of mixer devices that may be modified are:
.Bd -ragged -offset indent
.Cm vol , bass , treble , synth , pcm , speaker , line , mic , cd , mix ,
.Cm pcm2 , rec ,
.Cm igain , ogain ,
.Cm line1 , line2 , line3 ,
.Cm dig1 , dig2 , dig3 ,
.Cm phin , phout , video , radio ,
and
.Cm monitor .
.Ed
.Pp
Not all mixer devices are available.
.Pp
Without any arguments,
.Nm
displays all information for each one of the mixer's supported devices to
.Ar stdout .
If the
.Ar dev
argument is specified,
.Nm
displays only the values for
.Ar dev .
More than one device may be specified.
.Pp
Commands use the following format:
.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent
.It Sy Name Ta Sy Action
.It Ar dev Ta Display all controls
.It Ar dev Ns Cm \&. Ns Ar control Ta Display only the specified control
.It Ar dev Ns Cm \&. Ns Ar control Ns Cm \&= Ns Ar value Ta Set control value
.El
.Pp
The available controls are as follows (replace
.Ar dev
with one of the available devices):
.Sm off
.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent
.It Sy Name Ta Sy Value
.It Ar dev Cm .volume Ta Xo
.Ar vol |
.Oo Cm \&+ | Cm \&- Oc Ar lvol
.Oo Cm \&: Oo Cm \&+ | Cm \&- Oc Ar rvol Oc
.Xc
.It Ar dev Cm .mute Ta Cm 0 | 1 | ^
.It Ar dev Cm .recsrc Ta Cm ^ | + | - | =
.El
.Sm on
.Pp
The
.Ar dev Ns Cm .volume
control modifies a device's volume.
The optional
.Ar lvol
and/or
.Ar rvol
values have to be specified.
The values have to be normalized 32-bit floats, from 0.0 to 1.0 inclusively.
If no
.Ql \&.
character is present, the value is treated like a percentage, for backwards compatibility.
If the left or right volume values are prefixed with
.Cm +
or
.Cm - ,
the value following will be used as a relative adjustment, modifying the
current settings by the amount specified.
.Pp
The
.Ar dev Ns Cm .mute
control (un)mutes a device.
The following values are available:
.Bl -tag -width = -offset indent
.It Cm 0
unmutes
.Ar dev
.It Cm 1
mutes
.Ar dev
.It Cm ^
toggles the mute of
.Ar dev
.El
.Pp
The
.Ar dev Ns Cm .recsrc
control modifies the recording sources of a mixer.
.Nm
marks devices which can be used as a recording source with
.Sy rec .
Recording sources are marked with
.Sy src .
To modify the recording source you can use one of the following modifiers
on a
.Sy rec
device:
.Bl -tag -width = -offset indent
.It Cm ^
toggles
.Ar dev
of possible recording devices
.It Cm +
adds
.Ar dev
to possible recording devices
.It Cm -
removes
.Ar dev
from possible recording devices
.It Cm =
sets the recording device to
.Ar dev
.El
.Sh FILES
.Bl -tag -width /dev/mixerN -compact
.It Pa /dev/mixerN
The mixer device, where
.Ar N
is the number of that device, for example
.Ar /dev/mixer0 .
PCM cards and mixers have a 1:1 relationship, which means that
.Pa /dev/mixer0
is the mixer for
.Pa /dev/pcm0
and so on.
By default,
.Nm
prints both the audio card's number and the mixer associated with it
in the form of
.Ar pcmN:mixer .
The
.Pa /dev/mixer
file, although it does not exist in the filesystem, points to the default
mixer device and is the file
.Nm
opens when the
.Fl f Ar device
option has not been specified.
.El
.Sh EXAMPLES
Change the volume for the
.Cm vol
device of the
.Pa /dev/mixer0
mixer device to 0.65:
.Bd -literal -offset indent
$ mixer -f /dev/mixer0 vol.volume=0.65
.Ed
.Pp
Increase the
.Cm mic
device's left volume by 0.10 and decrease the right
volume by 0.05:
.Bd -literal -offset indent
$ mixer mic.volume=+0.10:-0.05
.Ed
.Pp
Toggle the mute for
.Cm vol :
.Bd -literal -offset indent
$ mixer vol.mute=^
.Ed
.Pp
Set
.Cm mic
and toggle
.Cm line
recording sources:
.Bd -literal -offset indent
$ mixer mic.recsrc=+ line.recsrc=^
.Ed
.Pp
Dump
.Pa /dev/mixer0
information to a file and retrieve back later:
.Bd -literal -offset indent
$ mixer -f /dev/mixer0 -o > info
\&...
$ mixer -f /dev/mixer0 `cat info`
.Ed
.Sh SEE ALSO
.Xr mixer 3 ,
.Xr sound 4 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 2.0.5
and was rewritten completely in
.Fx 14.0 .
.Sh AUTHORS
.An Christos Margiolis Aq Mt christos@FreeBSD.org