X11 Display and Jack

5 replies [Last post]
celesteh
User offline. Last seen 2 years 16 weeks ago. Offline
Joined: 2007-02-08
Posts:

I have an intel macmini, which has no monitor or keyboard and which I control with VNC remote desktop. This is kind of slow and laggy, so I'd like to just do a remote X11 display. I tried invoking ardour from the command line via /Applications/Ardour.app/Contents/MacOS/Ardour -DISPLAY $DISPLAY , but it ignored my argument (and environment variable) and opened on Display :0.0 . So I tried instead to open it via /Applications/Ardour.app/Contents/Resources/bin/exporter . This worked fine except for it had Jack errors:

allocate_mach_clientport: can't find mach server port
Can't allocate mach port

My questions: what's going on in /Applications/Ardour.app/Contents/MacOS/Ardour ? It's a binary file, so I can't read it. Is it in the source tarball? What's it's relative path there? What goes on so that it finds jack correctly?

paul
paul's picture
User offline. Last seen 5 hours 43 min ago. Offline
Joined: 2006-03-16
Posts:

X applications don't take an argument to specify the display, they use an environment variable. So try:

DISPLAY=wherever:0.0 /Applications/Ardour.app/Contents/MacOS/Ardour

is JACK already running when you get the mach server port error message?

celesteh
User offline. Last seen 2 years 16 weeks ago. Offline
Joined: 2007-02-08
Posts:

Yeah, I set the display variable via ssh tunneling ( ssh -X me@macmini.local ) and that makes no difference. If I have the display set and I invoke /Applications/Ardour.app/Contents/MacOS/Ardour , it opens in 0:0.

I get the mach error when jack is already running. I get the same error when I try running /usr/local/bin/jack_lsp. But I don't get it when I double click the icon for Ardour.app.

If I let Ardour start jack, I don't get a mach error, but it still doesn't produce sounds. I think this is related to running intel. I suspect that jackd needs special arguments to tell it to use an aggregate device instead of the "built in." I have not yet determined what those arguments are or where they lurk in a configuration file for Ardour.

Which is why I'm asking about the contents of /Applications/Ardour.app/Contents/MacOS/Ardour , since it does the right thing, I just need to modify it slightly to use the $DISPLAY variable.

taybin
User offline. Last seen 41 weeks 4 hours ago. Offline
Joined: 2006-03-15
Posts:

You want to modify /Applications/Ardour.app/Contents/Resources/script. The Ardour binary actually just calls that script which sets things up and then launches the real binary.

That script file is setting DISPLAY.

celesteh
User offline. Last seen 2 years 16 weeks ago. Offline
Joined: 2007-02-08
Posts:

Does the code that calls jack look at the $DISPLAY?

When I try this from the command line, it can't find jack. Then I double click on the icon, it seems to work.

Maybe this setup is not fated to be.

taybin
User offline. Last seen 41 weeks 4 hours ago. Offline
Joined: 2006-03-15
Posts:

Not that I know of.