[linux-audio-user] noise problem with ImproSculpt: solved ! - Linux-audio-user

16 Feb 2004

Greetings:

  I finally resolved the mouse noise problem with ImproSculpt. Here's 
what I did:

    1. Made the csound binary suid root.
    2. Erased the CsOptions for Linux in the ImproSculpt.csd file 
(they're ignored when csound is suid root).
    3. Ran the app so:

        csound --sched -d -i devaudio -o devaudio -b 512 -B 4096 -m6 
ImproSculpt.csd

  Screen redraws are slower, but the mouse noise is gone. I'm still 
confused as to why all this trouble just "suddenly" occurred, but I'm 
glad to have discovered a solution. I also learned a lot about PCI 
latency timing, graphics card priority, hard/software buffering, and 
lots of other stuff that chewed up a bunch of my time.

  Many thanks to all who responded to my dilemma, I appreciate all the 
assistance and advice.

Best regards,

dp

Gabriel Maldonado wrote:

...
  Hi Dave,
 It could depend on the massive CPU resources required by improsculpt, 
 so any movement on the GUI can subtract processor time, causing 
 drop-outs. Have you tried to increase the buffer size? However, try to 
 ask Oeyvind if this could be a possible cause. Notice that in 
 CsoundAV, there is still the original FLTK code, not that modified by 
 Istvan. I still have to study Istvan code, to see if there are 
 substantial differences, besides merging all code in a unique cpp file.

 Gabriel

 Dave Phillips wrote:

  Greetings:

  I've been testing various CSD files to see and hear how the FLTK 
 opcodes are supported in the most recent canonical CVS sources. Many 
 files work fine (e.g., J. M. Comajuncosas' 303 emulator, his Synth 
 Toot, and his Direct Hammond2), but I'm having a problem with Oeyvind 
 Brandtsegg's ImproSculpt. When I move the mouse in this program I 
 hear a nasty ripping noise tracking the mouse movement. Noise occurs 
 when I change window focus or move a window. Note that this noise 
 does not occur with other FLTK-based apps, so I'm wondering what 
 there might be in ImproSculpt to cause this trouble. Steven Yi 
 suggested that the FLTK updating may itself be a problem, but the 
 other apps tested work fine. So I'm at an impasse and can use some 
 suggestions for troubleshooting. Sorry to bother the developer's list 
 but it seemed the better forum to ask in. Could Steven be right about 
 the FLTK opcodes themselves causing the problem ? Would there be any 
 advantage compiling Csound against a static libfltk ?

 Best,

 Dave Phillips