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.\" $OpenBSD: sndioctl.1,v 1.8 2020/04/21 13:13:16 ratchov Exp $
.\"
.\" Copyright (c) 2014-2020 Alexandre Ratchov <alex@caoua.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: April 21 2020 $
.Dt SNDIOCTL 1
.Os
.Sh NAME
.Nm sndioctl
.Nd control audio parameters
.Sh SYNOPSIS
.Nm
.Bk -words
.Op Fl dimnqv
.Op Fl f Ar device
.Op Ar command ...
.Ek
.Sh DESCRIPTION
The
.Nm
utility can display or change parameters of
.Xr sndio 7
audio devices.
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Dump the raw list of available parameters and exit.
Useful as a debugging tool.
.It Fl f Ar device
Use this
.Xr sndio 7
audio device.
.It Fl i
Display characteristics of requested parameters
instead of their values.
.It Fl m
Monitor and display audio parameter changes.
.It Fl n
Suppress printing of the variable name.
.It Fl q
Suppress all printing when setting a variable.
.It Fl v
Enable verbose mode, a.k.a. multi-channel mode.
By default parameters affecting different channels
of the same stream are disguised as a single mono
parameter to hide details that are not essential.
.El
.Pp
If no commands are specified all valid parameters are displayed on
.Em stdout .
Unless
.Fl d ,
.Fl m ,
.Fl n ,
or
.Fl i
are used, displayed parameters are valid commands.
The set of available controls depends on the control device.
.Pp
Commands use the following two formats to display and set
parameters respectively:
.Pp
.Dl group/stream[channel].function
.Dl group/stream[channel].function=value
.Pp
On the left-hand side are specified the optional parameter group,
the affected stream name, and the optional channel number.
Examples of left-hand side terms:
.Pp
.Dl output.level
.Dl output[0].level
.Pp
Values are numbers between 0 and 1.
Two-state controls (switches) take either 0 or 1 as value,
typically corresponding to the
.Em off
and
.Em on
states respectively.
.Pp
If a decimal is prefixed by the plus (minus) sign then
the given value is added to (subtracted from) the
current value of the control.
If
.Qq \&!
is used instead of a number, then the switch is toggled.
.Sh EXAMPLES
The following will set all
.Ar output
channels
.Ar level
control to zero:
.Pp
.Dl $ sndioctl output.level=0
.Pp
The following set all
.Ar output
channels
.Ar mute
control:
.Pp
.Dl $ sndioctl output.mute=0
.Sh SEE ALSO
.Xr sioctl_open 3
|
