kfisher at rim.net
Tue Aug 18 12:52:13 UTC 1998
First I just want to thank Ian Piumarta for making Squeak 2.1 for UNIX
available...thanks! It works great!
Has anyone been working with the sqUnixSound.c patch for Linux systems? I
compiled the patch into Squeak and found some strange results. If I open a
Morphic project and bring up something that makes sounds (like the parts bin)
I get sporadic sound behaviour. Specifically, if I 'flip' a page in the parts
bin, I will get the flipping sound. If I flip it again, I get an error:
'subscript is out of bounds: 8817'.
This occurs during the critical section in the SoundPlayer class>>
PlayerSemaphore critical: [
"insert as many samples as possible into the sound driver's buffers"
1 to 2 * leftover do:
[:dst | Buffer at: dst put: (buf at: (src := src + 1))].
Specifically the out-of-bounds condition happens during the Buffer at:put:
in the above block, dst is the variable in question going out of bounds.
Finally, a third flip will cause the VM to hang waiting for a semaphore (which
can be stopped with alt-. ).
I'm going to try to debug this, but before I jump headlong into it I was
wondering if anyone else had seen this / debugged it already. I'm going to
look at the sqUnixSound.c as well, perhaps the problem isn't even in
Smalltalk! I'm not much of an OSS/Lite sound guru, but I guess you gotta start
(PS--have any Linux Squeakers out there considered trying ALSA instead of
the OSS/Lite drivers?)
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