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https://github.com/alsa-project/alsa-utils
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169 lines
4.5 KiB
Groff
169 lines
4.5 KiB
Groff
.TH AMIXER 1 "11 Aug 2000"
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.SH NAME
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amixer \- command-line mixer for ALSA soundcard driver
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.SH SYNOPSIS
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\fBamixer\fP [\fI\-option\fP] [\fIcmd\fP]
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.SH DESCRIPTION
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\fBamixer\fP allows command\-line control of the mixer for the ALSA
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soundcard driver.
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\fBamixer\fP supports multiple soundcards.
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\fBamixer\fR with no arguments will display the current mixer settings
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for the default soundcard and device. This is a good way to see a list
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of the simple mixer controls you can use.
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.SH COMMANDS
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.TP
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\fIhelp\fP
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Shows syntax.
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.TP
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\fIinfo\fP
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Shows the information about a mixer device.
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.TP
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\fIscontrols\fP
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Shows a complete list of simple mixer controls.
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.TP
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\fIscontents\fP
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Shows a complete list of simple mixer controls with their contents.
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.TP
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\fIset\fP or \fIsset\fP <\fISCONTROL\fP> <\fIPARAMETER\fP> ...
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Sets the simple mixer control contents. The parameter can be the volume
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either as a percentage from 0% to 100% with \fI%\fP suffix,
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a dB gain with \fIdB\fP suffix (like \-12.5dB), or an exact hardware value.
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The dB gain can be used only for the mixer elements with available
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dB information.
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When plus(+) or minus(\-) letter is appended after
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volume value, the volume is incremented or decremented from the current
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value, respectively.
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The parameters \fIcap, nocap, mute, unmute, toggle\fP are used to
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change capture (recording) and muting for the group specified.
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The optional modifiers can be put as extra parameters before the value to
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specify the stream direction or channels to apply.
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The modifiers \fIplayback\fP and \fIcapture\fP specify the stream,
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and the modifiers \fIfront, frontleft, frontright, frontcenter, center,
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rear, rearright, rearleft, woofer\fP are used to specify channels to be
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changed.
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A simple mixer control must be specified. Only one device can be controlled
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at a time.
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.TP
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\fIget\fP or \fIsget\fP <\fISCONTROL\fP>
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Shows the simple mixer control contents.
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A simple mixer control must be specified. Only one device can be controlled
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at a time.
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.TP
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\fIcontrols\fP
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Shows a complete list of card controls.
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.TP
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\fIcontents\fP
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Shows a complete list of card controls with their contents.
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.TP
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\fIcset\fP <\fICONTROL\fP> <\fIPARAMETER\fP> ...
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Sets the card control contents. The identifier has these components: iface,
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name, index, device, subdevice, numid. The next argument specifies the value
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of control.
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.TP
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\fIcget\fP <\fICONTROL\fP>
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Shows the card control contents. The identifier has same syntax as for
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the \fIcset\fP command.
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.SH ADVANCED COMMANDS
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.TP
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\fIsevents\fP
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Shows the events for the simple mixer controls.
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.TP
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\fIevents\fP
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Shows the events for the mixer controls.
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.SH OPTIONS
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.TP
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\fI\-c\fP card
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Select the card number to control. The device name created from this
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parameter has syntax 'hw:N' where N is specified card number.
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.TP
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\fI\-D\fP device
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Select the device name to control. The default control name is 'default'.
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.TP
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\fI\-s\fP | \fI\-\-stdin\fP
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Read from stdin and execute the command on each line sequentially.
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When this option is given, the command in command\-line arguments is ignored.
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Only sset and cset are accepted. Other commands are ignored.
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The commands to unmatched ids are ignored without errors too.
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.TP
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\fI\-h\fP
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Help: show syntax.
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.TP
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\fI\-q\fP
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Quiet mode. Do not show results of changes.
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.TP
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\fI\-R\fP
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Use the raw value for evaluating the percentage representation.
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This is the default mode.
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.TP
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\fI\-M\fP
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Use the mapped volume for evaluating the percentage representation
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like \fBalsamixer\fR, to be more natural for human ear.
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.SH EXAMPLES
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.TP
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\fBamixer \-c 1 sset Line,0 80%,40% unmute cap\fR
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will set the second soundcard's left line input volume to 80% and
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right line input to 40%, unmute it, and select it as a source for
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capture (recording).\fR
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.TP
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\fBamixer \-c 1 \-\- sset Master playback \-20dB\fR
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will set the master volume of the second card to \-20dB. If the master
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has multiple channels, all channels are set to the same value.
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.TP
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\fBamixer \-c 1 set PCM 2dB+\fR
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will increase the PCM volume of the second card with 2dB. When both
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playback and capture volumes exist, this is applied to both volumes.
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.TP
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\fBamixer \-c 2 cset iface=MIXER,name='Line Playback Volume",index=1 40%\fR
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will set the third soundcard's second line playback volume(s) to 40%
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.TP
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\fBamixer \-c 2 cset numid=34 40%\fR
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will set the 34th soundcard element to 40%
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.SH SEE ALSO
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\fB
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alsamixer(1)
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\fP
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.SH BUGS
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None known.
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.SH AUTHOR
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\fBamixer\fP is by Jaroslav Kysela <perex@perex.cz>.
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This document is by Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@perex.cz>.
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