S. Gongola wrote:
I mostly pipe everything through SDL. mplayer works through SDL, and most games use SDL. Like when I'm playing a shooting game when I press fire, I hear the shooting sound about a second later. Can I do anything to SDL to give it realtime priority?
I had similar issue when i switched from oss to alsa (via mobo with onboard sound, 2.4.22-1.2174.nptl kernel). Look at the logs, there sould be a few lines at the sound card initialization that asks you to set an option for the driver. I tried one and now there are no more delays. (I'm not at my box now so i can't tell you exact name and value of the option)
And what about artsd. When I click the run with realtime priority check-box it doesn't do much?
On Sun March 21 2004 05:59 am, Tom 'Needs A Hat' Mitchell wrote:
On Sat, Mar 20, 2004 at 09:04:10PM -0500, S. Gongola wrote:
It seems like I can only get real time sound without a delay when I'm logged in only as root. How can I get real time sound when I'm logged in as a user. What device permissions do I need to change, or adding the user to a certain group can solve the problem.
If the delays are not an issue for 'root' and they are for you when you are a normal 'user' then the issue is real time scheduling (or are you doing more stuff).
You did not indicate which player you are working with.
For xmms there is a config option "Use realtime priority when available". But "realtime priority" is restricted to root. N.B. with real time scheduling it is possible to apparently lock up a system.
Anyhow RTS it is not available to mortals. So....
First increase the buffer size.
Next perhaps open a window for a "su/su -" shell and run it there.
If 'root' is not an option the next trick is a bit more complicated. Since xmms can browse, read and write files there are risks!
If you know, understand and trust xmms AND it's plugins build a helper... If you try marking xmms SUID=root and run it from a shell prompt you will see this helpful hint that might apply to any player that has RTS system calls coded in it:
Gtk-WARNING **: This process is currently running setuid or setgid. This is not a supported use of GTK+. You must create a helper program instead. For further details, see:
http://www.gtk.org/setuid.html
Refusing to initialize GTK+.
Good luck. mitch
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