[Vm-dev] Re: [squeak-dev] Building (Linux) VM - with segfaults. that point to audio

Brad Fuller bradallenfuller at gmail.com
Mon Nov 17 23:02:04 UTC 2008

I'm not any further, but this is what I've found:

I seem to get the segfault it SoundPlayer>>playLoop at:

			self primSoundPlaySamples: count from: Buffer startingAt: 1.

But, I don\' know really where to go from here. I checked out
SoundPlugin and sqUnixSoundALSA.c
and they both have the function:

  int snd_PlaySamplesFromAtLength(int frameCount, int arrayIndex, int

which I assume is what is being called from Squeak.

When I run 'configure', the audio section that is sent to the terminal
looks correct:

checking for Advanced Linux Sound Architecture... yes
checking for Mac OS X CoreAudio... no
******** disabling vm-sound-MacOSX
checking for Network Audio System... no
******** disabling vm-sound-NAS
checking for Advanced Linux Sound Architecture... yes
checking for SunOS/Solaris audio... no
******** disabling vm-sound-Sun
checking for custom sound support... no
******** disabling vm-sound-custom

(don't know why ALSA is mentioned twice, though.)

Here's the segfault again:

Segmentation fault

20547312 [] in >playLoop
20547404 [] in Semaphore>critical:
20547220 BlockContext>ensure:
20547128 Semaphore>critical:
20515212 >playLoop
20515028 [] in >startPlayerProcessBufferSize:rate:stereo:sound:
20515120 [] in BlockContext>newProcess

BTW, it didn't matter when I changed the sample rate to 44100, still
had the segfault.

I don't know where to turn from here, short of compiling with debug
flag on and starting up gdb.
Any ideas much appreciated. If someone knows the architecture of what
happens when the primitive is called and what should happen in the
ALSA plugin code that could be helpful.

thanks for reading!

Brad Fuller

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