1.\"- 2.\" Copyright (c) 2021 Christos Margiolis <christos@FreeBSD.org> 3.\" 4.\" Permission is hereby granted, free of charge, to any person obtaining a copy 5.\" of this software and associated documentation files (the "Software"), to deal 6.\" in the Software without restriction, including without limitation the rights 7.\" to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8.\" copies of the Software, and to permit persons to whom the Software is 9.\" furnished to do so, subject to the following conditions: 10.\" 11.\" The above copyright notice and this permission notice shall be included in 12.\" all copies or substantial portions of the Software. 13.\" 14.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17.\" AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19.\" OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 20.\" THE SOFTWARE. 21.\" 22.\" $FreeBSD$ 23.\" 24.Dd March 13, 2022 25.Dt MIXER 8 26.Os 27.Sh NAME 28.Nm mixer 29.Nd manipulate soundcard mixer controls 30.Sh SYNOPSIS 31.Nm 32.Op Fl f Ar device 33.Op Fl d Ar unit 34.Op Fl os 35.Op Ar dev Ns Op Cm \&. Ns Ar control Ns Op Cm \&= Ns Ar value 36.Ar ... 37.Nm 38.Op Fl d Ar unit 39.Op Fl os 40.Fl a 41.Nm 42.Fl h 43.Sh DESCRIPTION 44The 45.Nm 46utility is used to set and display soundcard mixer device controls. 47.Pp 48The options are as follows: 49.Bl -tag -width "-f device" 50.It Fl a 51Print the values for all mixer devices available in the system 52.Pq see Sx FILES . 53.It Fl d Ar unit 54Change the default audio card to 55.Ar unit . 56The unit has to be an integer value. 57To see what unit values are available, look 58at the number each mixer device has by running 59.Nm . 60.It Fl f Ar device 61Open 62.Ar device 63as the mixer device 64.Pq see Sx FILES . 65.It Fl h 66Print a help message. 67.It Fl o 68Print mixer values in a format suitable for use inside scripts. 69The mixer's header (name, audio card name, ...) will not be printed. 70.It Fl s 71Print only the recording source(s) of the mixer device. 72.El 73.Pp 74The list of mixer devices that may be modified are: 75.Bd -ragged -offset indent 76.Cm vol , bass , treble , synth , pcm , speaker , line , mic , cd , mix , 77.Cm pcm2 , rec , 78.Cm igain , ogain , 79.Cm line1 , line2 , line3 , 80.Cm dig1 , dig2 , dig3 , 81.Cm phin , phout , video , radio , 82and 83.Cm monitor . 84.Ed 85.Pp 86Not all mixer devices are available. 87.Pp 88Without any arguments, 89.Nm 90displays all information for each one of the mixer's supported devices to 91.Ar stdout . 92If the 93.Ar dev 94argument is specified, 95.Nm 96displays only the values for 97.Ar dev . 98More than one device may be specified. 99.Pp 100Commands use the following format: 101.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent 102.It Sy Name Ta Sy Action 103.It Ar dev Ta Display all controls 104.It Ar dev Ns Cm \&. Ns Ar control Ta Display only the specified control 105.It Ar dev Ns Cm \&. Ns Ar control Ns Cm \&= Ns Ar value Ta Set control value 106.El 107.Pp 108The available controls are as follows (replace 109.Ar dev 110with one of the available devices): 111.Sm off 112.Bl -column xxxxxxxxxxxxxxxxxxxxxxxx -offset indent 113.It Sy Name Ta Sy Value 114.It Ar dev Cm .volume Ta Xo 115.Ar vol | 116.Oo Cm \&+ | Cm \&- Oc Ar lvol 117.Oo Cm \&: Oo Cm \&+ | Cm \&- Oc Ar rvol Oc 118.Xc 119.It Ar dev Cm .mute Ta Cm 0 | 1 | ^ 120.It Ar dev Cm .recsrc Ta Cm ^ | + | - | = 121.El 122.Sm on 123.Pp 124The 125.Ar dev Ns Cm .volume 126control modifies a device's volume. 127The optional 128.Ar lvol 129and/or 130.Ar rvol 131values have to be specified. 132The values have to be normalized 32-bit floats, 133from 0.0 to 1.0 inclusivly. 134If no 135.Ql \&. 136character is present, the value is treated 137like a percentage, for backwards compatibility. 138If the left or right volume values are prefixed with 139.Cm + 140or 141.Cm - , 142the value following will be used as a relative adjustment, modifying the 143current settings by the amount specified. 144.Pp 145The 146.Ar dev Ns Cm .mute 147control (un)mutes a device. 148The following values are available: 149.Bl -tag -width = -offset indent 150.It Cm 0 151unmutes 152.Ar dev 153.It Cm 1 154mutes 155.Ar dev 156.It Cm ^ 157toggles the mute of 158.Ar dev 159.El 160.Pp 161The 162.Ar dev Ns Cm .recsrc 163control modifies the recording sources of a mixer. 164.Nm 165marks devices which can be used as a recording source with 166.Sy rec . 167Recording sources are marked with 168.Sy src . 169To modify the recording source you can use one of the following modifiers 170on a 171.Sy rec 172device: 173.Bl -tag -width = -offset indent 174.It Cm ^ 175toggles 176.Ar dev 177of possible recording devices 178.It Cm + 179adds 180.Ar dev 181to possible recording devices 182.It Cm - 183removes 184.Ar dev 185from possible recording devices 186.It Cm = 187sets the recording device to 188.Ar dev 189.El 190.Sh FILES 191.Bl -tag -width /dev/mixerN -compact 192.It Pa /dev/mixerN 193The mixer device, where 194.Ar N 195is the number of that device, for example 196.Ar /dev/mixer0 . 197PCM cards and mixers have a 1:1 relationship, which means that 198.Pa /dev/mixer0 199is the mixer for 200.Pa /dev/pcm0 201and so on. 202By default, 203.Nm 204prints both the audio card's number and the mixer associated with it 205in the form of 206.Ar pcmN:mixer . 207The 208.Pa /dev/mixer 209file, although it does not exist in the filesystem, points to the default 210mixer device and is the file 211.Nm 212opens when the 213.Fl f Ar device 214option has not been specified. 215.El 216.Sh EXAMPLES 217Change the volume for the 218.Cm vol 219device of the 220.Pa /dev/mixer0 221mixer device to 0.65: 222.Bd -literal -offset indent 223$ mixer -f /dev/mixer0 vol.volume=0.65 224.Ed 225.Pp 226Increase the 227.Cm mic 228device's left volume by 0.10 and decrease the right 229volume by 0.05: 230.Bd -literal -offset indent 231$ mixer mic.volume=+0.10:-0.05 232.Ed 233.Pp 234Toggle the mute for 235.Cm vol : 236.Bd -literal -offset indent 237$ mixer vol.mute=^ 238.Ed 239.Pp 240Set 241.Cm mic 242and toggle 243.Cm line 244recording sources: 245.Bd -literal -offset indent 246$ mixer mic.recsrc=+ line.recsrc=^ 247.Ed 248.Pp 249Dump 250.Pa /dev/mixer0 251information to a file and retrieve back later: 252.Bd -literal -offset indent 253$ mixer -f /dev/mixer0 -o > info 254\&... 255$ mixer -f /dev/mixer0 `cat info` 256.Ed 257.Sh SEE ALSO 258.Xr mixer 3 , 259.Xr sound 4 , 260.Xr sysctl 8 261.Sh HISTORY 262The 263.Nm 264utility first appeared in 265.Fx 2.0.5 266and was rewritten completely in 267.Fx 14.0 . 268.Sh AUTHORS 269.An Christos Margiolis Aq Mt christos@FreeBSD.org 270