[Linux] 8-point inter. sound + GUI freeze

Demon Lord · Post by **Demon Lord** » Sun Jul 31, 2005 5:45 pm

Aloha!

As a programmer, I'll try to be as precise as I can.

On Linux (zsnes 2005-07-31 CVS), when 8-point interpolated sound is enabled, when a game is running and the GUI has been opened, returning from the GUI to the game often freezes the emu (>25%), at least on my PC.

The most probable origin of this bug is a change made on 2004-10-18 in src/linux/sdllink.c (change 1.145) to save CPU usage, as the bug did not happen on the 2004-10-18 branch but it does on 2004-10-19. This seems to concur when running through a debugger as it seems to be stuck in an infinite loop in the Check60hz function (or maybe that's a main function or something and I am mistaken as I don't really know zsnes' internals).

This bug occurs with every game I tried, and it doesn't happen in Windows or with other sound settings (like cubic-spline or gaussian interpolation). Other sound settings (sampling rate, lowpass, etc.) do not play a role in this bug, nor do any video settings.

Why this happens only with 8-point interpolation I haven't really looked.

--
Eric

Relevant system info:
SourceMage GNU/Linux (Linux 2.6.12-ck4)
SDL 1.2.8
X.org 6.8.2
Toshiba Satellite 5100 laptop
Intel(R) Pentium(R) 4 Mobile CPU 1.70GHz stepping 04

BaD.BoY · Post by **BaD.BoY** » Sun Jul 31, 2005 6:13 pm

http://zsnes.ownsjoo.info/bugzilla/show_bug.cgi?id=21

Demon Lord · Post by **Demon Lord** » Sun Jul 31, 2005 6:17 pm

BaD.BoY wrote:http://zsnes.ownsjoo.info/bugzilla/show_bug.cgi?id=21

I don't think it is related, this is a crash, mine's a freeze, and it does not occur in the same context.

CyberBotX · Post by **CyberBotX** » Sun Jul 31, 2005 6:21 pm

I remember mentioning this a while back, but I use FreeBSD and not Linux. Although I am using the Linux version since it does compile under FreeBSD. But this same problem comes up for me as well. I found that the only sound interpolation modes that work for me are Gaussian and Cubic Spine, but if I try to use 8-Point or any of the lowpass filters, it'll freeze on me when i try to reenter the game from the GUI. If it still freezes for you, I'd just try leaving interpolation off.

Demon Lord · Post by **Demon Lord** » Sun Jul 31, 2005 6:32 pm

CyberBotX wrote:I remember mentioning this a while back, but I use FreeBSD and not Linux. Although I am using the Linux version since it does compile under FreeBSD. But this same problem comes up for me as well. I found that the only sound interpolation modes that work for me are Gaussian and Cubic Spine, but if I try to use 8-Point or any of the lowpass filters, it'll freeze on me when i try to reenter the game from the GUI. If it still freezes for you, I'd just try leaving interpolation off.

This seems indeed related to your bug (link). I don't have problem with lowpass, however.

BaD.BoY · Post by **BaD.BoY** » Sun Jul 31, 2005 6:46 pm

Yes, It is a related bug, only a variant. When devs fix major problem with sound interpolation enabled during game, if your zsnes still freezing, just report again.