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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 DEBIAN

locale::script

Locale::Script(3perl)					 Perl Programmers Reference Guide				     Locale::Script(3perl)

NAME

       Locale::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. The ones currently supported are:

       alpha
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.

	   This code set is identified with the symbol "LOCALE_SCRIPT_ALPHA".

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       numeric
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

	   This code set is identified with the symbol "LOCALE_SCRIPT_NUMERIC".

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Script::delete_script  ( CODE [,CODESET] )
       Locale::Script::add_script_alias  ( NAME ,NEW_NAME )
       Locale::Script::delete_script_alias  ( NAME )
       Locale::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Script::delete_script_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes man page.

SEE ALSO

       Locale::Codes
       Locale::Constants
       http://www.unicode.org/iso15924/
	   Home page for ISO 15924.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2011 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-09-26						     Locale::Script(3perl)
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