[Alsa-user] custom controls for alsamixer

[Stefan Sauer]

Hi,

for a raspberry pi i2s audio addon we use this snippet in the asoundrc:

pcm.micboost {
type route
slave.pcm dsnoop
ttable {
0.0 30.0
1.1 30.0
}
}

The hardware has no mixer. Now we'd like to make the "30.0" a value to
be exposed as a control, so that e.g. alsamixer would show it. If seen
that there is a control { } block, but I can't find docs for it. Any
pointers.

Stefan

[Clemens Ladisch]

Post by Stefan Sauer
pcm.micboost {
type route
slave.pcm dsnoop
ttable {
0.0 30.0
1.1 30.0
}
}
The hardware has no mixer. Now we'd like to make the "30.0" a value to
be exposed as a control, so that e.g. alsamixer would show it. If seen
that there is a control { } block, but I can't find docs for it.

Only the softvol plugin has the ability to change the volumn dynamically.


Regards,
Clemens

[Stefan Sauer]

Post by Clemens Ladisch

Post by Stefan Sauer
pcm.micboost {
type route
slave.pcm dsnoop
ttable {
0.0 30.0
1.1 30.0
}
}
The hardware has no mixer. Now we'd like to make the "30.0" a value to
be exposed as a control, so that e.g. alsamixer would show it. If seen
that there is a control { } block, but I can't find docs for it.

Only the softvol plugin has the ability to change the volumn dynamically.

Can I apply softvol to an input?

Stefan

Post by Clemens Ladisch
Regards,
Clemens
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[Clemens Ladisch]

Post by Stefan Sauer
Can I apply softvol to an input?

Yes.


Regards,
Clemens