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4014365e42
The current situation is fairly confusing, where an integer is interpreted as a percent until you slap a decimal on it and magically it becomes an absolute value. Let's have a flag day in 14.0 and remove this shim entirely. Setting with percent can still be useful, so allow a trailing '%' to indicate as such. As a side effect, we tighten down the format allowed in the volume a little bit by ensuring there's no trailing garbage after the value once it's separated into left and right components. Reviewed by: christos, hselasky, pauamma_gundo.com (manpages) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D35101
276 lines
6.5 KiB
Groff
276 lines
6.5 KiB
Groff
.\"-
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.\" Copyright (c) 2021 Christos Margiolis <christos@FreeBSD.org>
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a copy
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.\" of this software and associated documentation files (the "Software"), to deal
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.\" in the Software without restriction, including without limitation the rights
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.\" to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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.\" copies of the Software, and to permit persons to whom the Software is
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.\" furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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.\" AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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.\" OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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.\" THE SOFTWARE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 29, 2022
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.Dt MIXER 8
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.Os
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.Sh NAME
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.Nm mixer
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.Nd manipulate soundcard mixer controls
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar device
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.Op Fl d Ar unit
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.Op Fl os
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.Op Ar dev Ns Op Cm \&. Ns Ar control Ns Op Cm \&= Ns Ar value
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.Ar ...
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.Nm
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.Op Fl d Ar unit
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.Op Fl os
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.Fl a
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.Nm
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.Fl h
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to set and display soundcard mixer device controls.
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.Pp
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The options are as follows:
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.Bl -tag -width "-f device"
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.It Fl a
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Print the values for all mixer devices available in the system
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.Pq see Sx FILES .
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.It Fl d Ar unit
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Change the default audio card to
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.Ar unit .
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The unit has to be an integer value.
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To see what unit values are available, look at the number each mixer device has by running
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.Nm .
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.It Fl f Ar device
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Open
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.Ar device
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as the mixer device
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.Pq see Sx FILES .
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.It Fl h
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Print a help message.
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.It Fl o
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Print mixer values in a format suitable for use inside scripts.
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The mixer's header (name, audio card name, ...) will not be printed.
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.It Fl s
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Print only the recording source(s) of the mixer device.
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.El
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.Pp
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The list of mixer devices that may be modified are:
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.Bd -ragged -offset indent
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.Cm vol , bass , treble , synth , pcm , speaker , line , mic , cd , mix ,
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.Cm pcm2 , rec ,
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.Cm igain , ogain ,
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.Cm line1 , line2 , line3 ,
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.Cm dig1 , dig2 , dig3 ,
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.Cm phin , phout , video , radio ,
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and
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.Cm monitor .
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.Ed
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.Pp
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Not all mixer devices are available.
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.Pp
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Without any arguments,
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.Nm
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displays all information for each one of the mixer's supported devices to
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.Ar stdout .
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If the
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.Ar dev
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argument is specified,
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.Nm
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displays only the values for
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.Ar dev .
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More than one device may be specified.
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.Pp
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Commands use the following format:
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.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent
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.It Sy Name Ta Sy Action
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.It Ar dev Ta Display all controls
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.It Ar dev Ns Cm \&. Ns Ar control Ta Display only the specified control
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.It Ar dev Ns Cm \&. Ns Ar control Ns Cm \&= Ns Ar value Ta Set control value
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.El
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.Pp
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The available controls are as follows (replace
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.Ar dev
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with one of the available devices):
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.Sm off
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.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent
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.It Sy Name Ta Sy Value
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.It Ar dev Cm .volume Ta Xo
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.Ar vol |
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.Oo Cm \&+ | Cm \&- Oc Ar lvol Oo % Oc
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.Oo Cm \&: Oo Cm \&+ | Cm \&- Oc Ar rvol Oo % Oc Oc
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.Xc
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.It Ar dev Cm .mute Ta Cm 0 | 1 | ^
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.It Ar dev Cm .recsrc Ta Cm ^ | + | - | =
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.El
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.Sm on
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.Pp
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The
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.Ar dev Ns Cm .volume
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control modifies a device's volume.
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The optional
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.Ar lvol
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and/or
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.Ar rvol
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values have to be specified.
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The values should typically be decimal numbers between 0 and 1 with at most 2
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digits after the decimal point.
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A trailing percent sign indicates that the value should be treated as a
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percentage of 1.0, rather than an absolute value.
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Thus, 70% means the same as 0.7.
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If the left or right volume values are prefixed with
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.Cm +
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or
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.Cm - ,
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the value following will be used as a relative adjustment, modifying the
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current settings by the amount specified.
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Note that relative percentages are still relative to 1.0, not to the current
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value.
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If the volume is currently 0.40 and an adjustment of +20% is specified, then
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thet final volume will be set to 0.60.
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.Pp
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Volume can also be set using the shorthand
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.Ar dev Ns Cm =value .
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This syntax does not apply to other controls.
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.Pp
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The
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.Ar dev Ns Cm .mute
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control (un)mutes a device.
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The following values are available:
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.Bl -tag -width = -offset indent
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.It Cm 0
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unmutes
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.Ar dev
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.It Cm 1
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mutes
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.Ar dev
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.It Cm ^
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toggles the mute of
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.Ar dev
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.El
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.Pp
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The
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.Ar dev Ns Cm .recsrc
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control modifies the recording sources of a mixer.
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.Nm
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marks devices which can be used as a recording source with
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.Sy rec .
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Recording sources are marked with
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.Sy src .
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To modify the recording source you can use one of the following modifiers
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on a
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.Sy rec
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device:
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.Bl -tag -width = -offset indent
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.It Cm ^
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toggles
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.Ar dev
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of possible recording devices
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.It Cm +
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adds
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.Ar dev
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to possible recording devices
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.It Cm -
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removes
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.Ar dev
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from possible recording devices
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.It Cm =
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sets the recording device to
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.Ar dev
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.El
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.Sh FILES
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.Bl -tag -width /dev/mixerN -compact
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.It Pa /dev/mixerN
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The mixer device, where
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.Ar N
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is the number of that device, for example
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.Ar /dev/mixer0 .
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PCM cards and mixers have a 1:1 relationship, which means that
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.Pa /dev/mixer0
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is the mixer for
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.Pa /dev/pcm0
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and so on.
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By default,
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.Nm
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prints both the audio card's number and the mixer associated with it
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in the form of
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.Ar pcmN:mixer .
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The
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.Pa /dev/mixer
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file, although it does not exist in the filesystem, points to the default
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mixer device and is the file
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.Nm
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opens when the
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.Fl f Ar device
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option has not been specified.
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.El
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.Sh EXAMPLES
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Change the volume for the
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.Cm vol
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device of the
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.Pa /dev/mixer0
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mixer device to 0.65:
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.Bd -literal -offset indent
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$ mixer -f /dev/mixer0 vol.volume=0.65
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.Ed
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.Pp
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Increase the
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.Cm mic
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device's left volume by 0.10 and decrease the right
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volume by 0.05:
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.Bd -literal -offset indent
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$ mixer mic.volume=+0.10:-0.05
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.Ed
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.Pp
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Toggle the mute for
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.Cm vol :
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.Bd -literal -offset indent
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$ mixer vol.mute=^
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.Ed
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.Pp
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Set
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.Cm mic
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and toggle
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.Cm line
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recording sources:
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.Bd -literal -offset indent
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$ mixer mic.recsrc=+ line.recsrc=^
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.Ed
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.Pp
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Dump
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.Pa /dev/mixer0
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information to a file and retrieve back later:
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.Bd -literal -offset indent
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$ mixer -f /dev/mixer0 -o > info
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\&...
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$ mixer -f /dev/mixer0 `cat info`
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.Ed
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.Sh SEE ALSO
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.Xr mixer 3 ,
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.Xr sound 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 2.0.5
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and was rewritten completely in
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.Fx 14.0 .
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.Sh AUTHORS
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.An Christos Margiolis Aq Mt christos@FreeBSD.org
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