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Full Discussion: udev rule + script for setting webcam's mic as audio input
Operating Systems Linux udev rule + script for setting webcam's mic as audio input Post 302696329 by MojoDodo on Tuesday 4th of September 2012 08:02:50 PM
Old 09-04-2012
udev rule + script for setting webcam's mic as audio input
Hello,
whenever I plugin my webcam, I want to use its microphone instead of the one integrated in my laptop.
I therefore created a udev rule:
Code:
SUBSYSTEM=="usb", ATTR{idVendor}=="046d", ATTR{idProduct}=="0807", RUN+="/usr/local/bin/webcammic"

This rule works, I've tested it with a testscript (the testscript works when I plugin my webcam).

For changing the microphone I use the following script.
Code:
#!/bin/bash
echo "set-default-source alsa_input.usb-046d_0807_83CCA370-02-U0x46d0x807.analog-mono" | pacmd

This works as well if I execute it in my comand line like this:
Code:
jo@jo-P53E:~$ sh /usr/local/bin/webcammic
Welcome to PulseAudio! Use "help" for usage information.

However udev seems to execute as root and therefore the script in combination with the udev rule doesn't work (→ nothing happens when I plug in my webcam).
I therefore changed the script to:
Code:
#!/bin/bash
su jo -c "echo \"set-default-source alsa_input.usb-046d_0807_83CCA370-02-U0x46d0x807.analog-mono\" | pacmd"

But if I plugin the webcam, nothing happens. If I execute the script in the command line, I get the following error:
Code:
jo@jo-P53E:~$ sh /usr/local/bin/webcammic
Passwort: 
Welcome to PulseAudio! Use "help" for usage information.
>>> >>> Sessions still open, not unmounting
jo@jo-P53E:~$

Does anybody know what's wrong with my script or has any suggestions what to try else?
Thanks in advance!


Just for Information: I'm using Ubuntu 12.04
 

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LEARN ABOUT LINUX

dh_installudev

DH_INSTALLUDEV(1)						     Debhelper							 DH_INSTALLUDEV(1)

NAME

       dh_installudev - install udev rules files

SYNOPSIS

       dh_installudev [debhelperoptions] [-n] [--name=name] [--priority=priority]

DESCRIPTION

       dh_installudev is a debhelper program that is responsible for installing udev rules files.

       Code is added to the preinst and postinst to handle the upgrade from the old udev rules file location.

FILES

       debian/package.udev
	   Installed into lib/udev/rules.d/ in the package build directory.

OPTIONS

       --name=name
	   When this parameter is used, dh_installudev looks for and installs files named debian/package.name.udev instead of the usual
	   debian/package.udev.

       --priority=priority
	   Sets the priority string of the rules.d symlink. Default is 40.

       -n, --noscripts
	   Do not modify preinst/postinst scripts.

NOTES

       Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command. Otherwise, it may cause multiple
       instances of the same text to be added to maintainer scripts.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

8.9.0ubuntu2.1							    2012-06-12							 DH_INSTALLUDEV(1)
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