Re: [Alsa-user] Limited access to capture source

[Clemens L. <cl...@la...>]

ce...@op... wrote:
> Have a linux system (Debian) with automatic voice recording (when user log
> in).
> Users should not have impact on that process - do not mute mic, do not
> change capture source nor recording level.
> However audio playback should be unrestricted for all users.

All mixer controls of a card are managed with a single device node
(/dev/snd/controlCx), so it is not possible to use file permissions for
this.

However, in your recording program (or a separate tool), you can call
snd_ctl_elem_lock() for all mixer controls that no other program should
be able to change.


Regards,
Clemens