Arch Linux

pforcht

Member

Registered: 2011-01-08

Posts: 10

[solved] How to detect inserted audiojack to launch a script

Hello community,

how do i make my computer to execute a short script, when a audiojack is inserted?
I would like to play a short jingle, when i plug in my headphones, just like my old Sony Ericsson mobile some years ago :-)

I'm using Arch Linux 3.3.6-1 on my Thinkpad X201
ALSA or Pulseaudio already notice plugged headphones and store different gains for each output.

Any ideas?

Thank you in advance

Last edited by pforcht (2012-05-23 14:50:16)

brebs

Member

Registered: 2007-04-03

Posts: 3,742

Re: [solved] How to detect inserted audiojack to launch a script

Probably start with CONFIG_SND_HDA_INPUT_JACK in the kernel config.

pforcht

Member

Registered: 2011-01-08

Posts: 10

Re: [solved] How to detect inserted audiojack to launch a script

Hi brebs,

thanks for your reply. How can I find out, if this flag is enabled in my kernel?
I'm not compiling my kernel on my own - I use the precompiled version from Repository.

brebs

Member

Registered: 2007-04-03

Posts: 3,742

Re: [solved] How to detect inserted audiojack to launch a script

To see config of current kernel:

zgrep JACK /proc/config.gz

pforcht

Member

Registered: 2011-01-08

Posts: 10

Re: [solved] How to detect inserted audiojack to launch a script

Very nice - already enabled i guess (?): CONFIG_SND_HDA_INPUT_JACK=y

Anyway I don't know how to capture these events. For ACPI I already know, but the audiojack doesn't create any ACPI events.

I found https://wiki.archlinux.org/index.php/Ja … ner_Daemon but it does not exist in AUR anymore.

Any hints?

Last edited by pforcht (2012-05-21 14:13:55)

masutu

Member

Registered: 2010-01-30

Posts: 40

Re: [solved] How to detect inserted audiojack to launch a script

Hi pforcht,
are you sure about that acpi thing? I searched the mailing list and this is what i found:

alexander.r@gmx.com via archlinux.org
   
Apr 27
       
to aur-general
Please remove following packages:
https://aur.archlinux.org/packages.php?ID=57515 (jackeventcmd-git)
https://aur.archlinux.org/packages.php?ID=57514 (jacklistener-git)
https://aur.archlinux.org/packages.php?ID=57513 (jacknotifier-git)
as jack (un)plug event handling is implemented in the latest acpid version.

For me this is true:

[root@myhost]# acpi_listen 
jack/headphone HEADPHONE plug
jack/headphone HEADPHONE unplug

So it should be possible to create an acpi handler for this event.

If this is for some reason not working, here are some ideas:
1. check (evtest), which input device is used for your headphone jack and write your own listener
2. /proc/asound/card0/codec#0 (in my case) stores the information about the "plug status"

masutu:~$ cat /proc/asound/card0/codec\#0 > unplugged
masutu:~$ cat /proc/asound/card0/codec\#0 > plugged  
masutu:~$ diff unplugged plugged 
139c139
<   Pin-ctls: 0x40: OUT
---
>   Pin-ctls: 0x00:

Maybe you can use this for your event handler
3. the jacklistener repo is still up, did you try it?

pforcht

Member

Registered: 2011-01-08

Posts: 10

Re: [solved] How to detect inserted audiojack to launch a script

YEAH! Than you very much.

You are right, it is implemented by ACPI. I just got used to it to watch for Events in /var/log/acpi or /var/log/everything. I forgot about acpi_listen.
Now I can make these Scripts very easy.

Btw: it also recognizes a pluged/unplugged microphone jack:

jack/microphone MICROPHONE plug
jack/microphone MICROPHONE unplug

Once again - Thank you, and the kind ArchLinux community

Edit: For someone else with this issue, here my acpi scripts:

Add a file (named as you wish) to directory /etc/acpi/events/ with following text:

event=jack/*
action=/PATH/TO/YOUR/CUSTOM/ACPI/SCRIPTS/soundevents.sh %e

After that on every jack/* event the script 'soundevents.sh' is being executed, passing the event as parameter (%e).
My soundevents.sh currently includes:

#!/bin/bash

SndHeadPlug="/path/to/soundfile.mp3"
SndHeadUnplug="/path/to/an/other/sound.wav"
SndMicPlug=""
SndMicUnplug=""

Player="mplayer -really-quiet"

case "$1" in
	jack/headphone)
		case "$3" in
			plug)
				$Player $SndHeadPlug
			;;
			unplug)
				$Player $SndHeadUnplug
			;;
		esac
	;;
	jack/microphone)
		case "$3" in
			plug)
				$Player $SndMicPlug
			;;
			unplug)
				$Player $SndMicUnplug
			;;
		esac
	;;
esac

Last edited by pforcht (2012-05-23 14:49:56)