27 Feb
2011
27 Feb
'11
2:12 p.m.
*
david wrote:
Hmm, maybe make a script that checks to see if
firewire device is
connected. If true, it starts JACK with the firewire backend, otherwise,
it starts with your ALSA backend. Maybe you could run that script on
startup.*
Thanks David, but as a beginner I have no idea where to write this scipt. I
assume you don't mean that I write such a script in the QjackCtl setup GUI,
right?
*Dominic Sacr? wrote:*
*> The "Execute script on Startup" field is used to run a command before
the JACK server is started (which may or may not be
the same time
QjackCtl is started).
The meta-symbols can be used to pass parameters to the command. For
example, if "alsa" is your active QjackCtl preset, %P would be replaced
with "alsa" when the command is executed.
From your description it sounds like to don't need
a startup script at
all, but what you really want is "qjackctl -p alsa".*
That's very insightful Dominic - thanks! What would "qjackctl -p alsa" do
and where would I enter it? in the QjackCtl settings window? I don't
understand the meta-symbols at all. So "%P alsa" is meaningless in terms of
automatically loading a QjackCtl preset?
Dan
27 Feb
27 Feb
3:48 p.m.
New subject: Help needed with Scripting in QjackCtl
On 02/27/2011 02:12 PM, Dan Capp wrote:
*
david wrote:
The goal you want to achieve is not really "beginner-level". Seamless
JACK Destop integration is sth that even experts have not cleanly
solved. It's mostly historical: AFAIK jack was never really intended as
flexible desktop-sound daemon.
OTOH writing a custom script for one individual use-case is not very hard.
Hmm, maybe make a script that checks to see if
firewire device is
connected. If true, it starts JACK with the firewire backend, otherwise,
it starts with your ALSA backend. Maybe you could run that script on
startup.*
Thanks David, but as a beginner I have no idea where to write this scipt. I assume you don't mean that I write such a script
in the QjackCtl setup GUI,
right?
right.
You do want to control qjackctl.
The qjackctl "setup->scripting" options are intended if you want to
control some other program(s) _from_ qjackctl.
Shell Script is series of command written in plain text file.
You write scripts it in a text editor. Save it to e.g. 'myfile.sh' and
make it executable (right-click-on-file -> Properties -> Permisions ->
"allow executing file as program" or use a Terminal run 'chmod +x
myfile.sh').
"How to write shell script":
http://www.freeos.com/guides/lsst/ch02sec01.html
*Dominic Sacr? wrote:*
*> The "Execute script on Startup" field is used to run a command before
Alas, it's not going to be that easy. AFAIK that will only work if jack
is not yet started.
the JACK server is started (which may or may not
be the same time
QjackCtl is started).
The meta-symbols can be used to pass parameters to the command. For
example, if "alsa" is your active QjackCtl preset, %P would be replaced
with "alsa" when the command is executed.
> From your description it sounds like to don't need a startup script at
> all, but what you really want is "qjackctl -p alsa".* That's very insightful Dominic - thanks! What
would "qjackctl -p alsa" do
and where would I enter it?
It launches qjackctl (if it is not already started) and selects the
preset named "alsa". - Open a terminal and enter the above command.
While you're at it: type "qjackctl --help" (without the quotes) in the
terminal. and "man qjackctl" (manual page - press 'q' to exit the
manual
viewer)..
You'd add that command to the programs to be started after login. On
Gnome you can set those in
Menu -> System -> Preferences -> Startup-Applications
HTH,
robin
4:53 p.m.
New subject: Help needed with Scripting in QjackCtl
Those two messages are really useful Robin! Thank you. I'll need to study
your advice a bit and make sure I can implement it without screwing my
system. Thanks again - great info!
Dan
4811
days inactive
4811
days old
linux-audio-user@lists.linuxaudio.org
2 comments
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participants (2)
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Dan Capp -
Robin Gareus