[X2Go-User] Is it possible to get pulseaudio sound in app mode?

[Edouard Gaulué]

>> I think everything is linked with the fact I try not to use a
>> windows manager, but I'm even not sure pulseaudio can deal with
>> several simultenous users.
>>
>> Any advices/ideas would be really appreciated.
> Maybe I'm misinterpreting your statement, but if you don't want to run
> a window manager on the server side, you should be running one
> locally, and you have to take care of starting pulseaudio on the
> client as well.
Well that's rather true even if you can launch an application that 
supports it directly through xinit without any window manager. But in my 
case, I remembered an old post advising using a minimal window manager 
with Rpi: matchbox. Rpi is so slow with a classical desktop manager.

The reason I use x2go is :
  * X compression
  * should work out of the box

But I also like to understand what is in the engine. After a long 
reading and looking in the code yesterday I understood I was wrong 
regarding what is client and server for X and pulseaudio.

For pulseaudio the server is my Rpi, so that's here I need to launch 
start-pulseaudio-x11. As far as I understand, it will add X properties 
to the X communication between my client (the Rpi) and the application 
server.

I still don't fully understand how it works after you push ssh -X 
aaaa at bbbb.cccc /usr/bin/iceweasel. It looks it starts iceweasel on the 
application server. Iceweasel being pulseaudio compliant (it has a 
client inside), it gets those X properties from the Rpi and understand 
it has to send it's data to the pulseaudio server on the Rpi. I'm maybe 
wrong, but pulseaudio server seems useless on the application server as 
long as applications have a pulseaudio client "inside".

So, with this script launch from xinit in the Rpi, I should hear a sound 
on the Rpi (I say I should because I can't try it right now):

# Start pulseaudio (or check it's allready started) with X11 support
start-pulseaudio-x11
# Leave machines in the local IP network connect to the Rpi pulseaudio 
server
pactl load-module module-native-protocol-tcp 
auth-ip-acl=your_local_network_IP
# Start an ssh X session asking to just play a sound
ssh -X aaaa at bbbb.cccc paplay /usr/share/sounds/beep.wav

And for x2goclient, this should do the trick:

# Help application that need information regarding the window
matchbox-window-manager &
# Start pulseaudio (or check it's allready started) with X11 support
start-pulseaudio-x11
# Start x2go (session launch will load necessary pulseaudio modules)
x2goclient --maximize

Regards, EG