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

[Dave Phillips]

Extra note:

  I brought -B to 1024 and still had no noise problem with the mouse. I 
think the suid may have helped most. Also, I ran it with -b 1 and locked 
my machine. Not a good idea, I guess...

Best,

dp




Dave Phillips wrote:

> 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
>>>
>>>
>>
>>
>
>
>