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AMIXER(1) |
FreeBSD General Commands Manual |
AMIXER(1) |
amixer - command-line mixer for ALSA soundcard driver
amixer allows command-line control of the mixer for the ALSA soundcard
driver. amixer supports multiple soundcards.
amixer with no arguments will display the current mixer
settings for the default soundcard and device. This is a good way to see a
list of the simple mixer controls you can use.
- help
- Shows syntax.
- info
- Shows the information about a mixer device.
- scontrols
- Shows a complete list of simple mixer controls.
- scontents
- Shows a complete list of simple mixer controls with their contents.
- set or sset <SCONTROL> <PARAMETER>
...
- Sets the simple mixer control contents. The parameter can be the volume
either as a percentage from 0% to 100% with % suffix, a dB gain
with dB suffix (like -12.5dB), or an exact hardware value. The dB
gain can be used only for the mixer elements with available dB
information. When plus(+) or minus(-) letter is appended after volume
value, the volume is incremented or decremented from the current value,
respectively.
The parameters cap, nocap, mute, unmute, toggle are
used to change capture (recording) and muting for the group
specified.
The optional modifiers can be put as extra parameters to
specify the stream direction or channels to apply. The modifiers
playback and capture specify the stream, and the modifiers
front, rear, center, woofer are used to specify channels to be
changed.
A simple mixer control must be specified. Only one device can
be controlled at a time.
- get or sget <SCONTROL>
- Shows the simple mixer control contents.
A simple mixer control must be specified. Only one device can
be controlled at a time.
- controls
- Shows a complete list of card controls.
- contents
- Shows a complete list of card controls with their contents.
- cset <CONTROL> <PARAMETER> ...
- Sets the card control contents. The identifier has these components:
iface, name, index, device, subdevice, numid. The next argument specifies
the value of control.
- cget <CONTROL>
- Shows the card control contents. The identifier has same syntax as for the
cset command.
- -c card
-
Select the card number to control. The device name created
from this parameter has syntax 'hw:N' where N is specified card
number.
- -D device
-
Select the device name to control. The default control name is
'default'.
- -s | --stdin
-
Read from stdin and execute the command on each line
sequentially. When this option is given, the command in command-line
arguments is ignored.
Only sset and cset are accepted. Other commands are ignored.
The commands to unmatched ids are ignored without errors too.
- -h
- Help: show syntax.
- -q
- Quiet mode. Do not show results of changes.
- -R
- Use the raw value for evaluating the percentage representation. This is
the default mode.
- -M
- Use the mapped volume for evaluating the percentage representation like
alsamixer, to be more natural for human ear.
- amixer -c 1 sset Line,0 80%,40% unmute cap
- will set the second soundcard's left line input volume to 80% and right
line input to 40%, unmute it, and select it as a source for capture
(recording).
- amixer -c 1 -- sset Master playback -20dB
- will set the master volume of the second card to -20dB. If the master has
multiple channels, all channels are set to the same value.
- amixer -c 1 set PCM 2dB+
- will increase the PCM volume of the second card with 2dB. When both
playback and capture volumes exist, this is applied to both volumes.
- amixer -c 2 cset iface=MIXER,name='Line Playback Volume",index=1
40%
- will set the third soundcard's second line playback volume(s) to 40%
- amixer -c 2 cset numid=34 40%
- will set the 34th soundcard element to 40%
amixer is by Jaroslav Kysela <perex@perex.cz>. This document is by
Paul Winkler <zarmzarm@erols.com> and Jaroslav Kysela
<perex@perex.cz>.
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