Re: [fluid-dev] FS 1.1.2 alpha sound rendering issue

[David Henningsson]

 Okay, cool that things appear fixed. But may I ask - what OS are you 
jOrgan guys running? It could be that the thread synchronisation 
overhead varies much between operating systems. As for now, I've just 
set it to "8" which means that if there is less that 8 active voices, 
there is no use waking up all the threads, so it just runs a 
single-threaded loop. One might want to experiment with this some time 
in the future.

As for future planning, we might want to roll out a 1.1.3 release with 
just these fixes in. We have fixed ladspa, doxygen (credits to plcl), 
and now this. What do you think of that?

In the meantime, I'm glad to see that (thanks to Sven Meier and Alessio 
Treglia) that 1.1.2 of FluidSynth will reach Ubuntu Maverick! (And yes, 
it will build with CMake :-) )

// David

On 2010-09-14 16:58, Bernd Casper wrote:
> Hi David,
> you hit the point exactly. After Sven compiled the latest svn, all the 
> crackling has gone completely, as confirmed from both the other 
> testers who had the crackles too. Also memory usage and latency seem 
> much improved. So much thanks for the changes. So far, it seems not to 
> have something to do with cpu-cores.
> I take the liberty to forward their answers to the fluid-dev list. 
> Great work, Gents.
> Many thanks again
> Bernd.
> ****************************
> This works great! The single-note crackling problem is fixed!. I am
> also able to reduce the buffer size X count to 512 X 3 with no sound
> breakup! This gives very good latency as well.
>
> CLW
> ****************************
>   Hello Bernd
>
> Thank you for distributing this. I have just tested it and didn't want
> to stop playing. The touch performance and the tonal clarity are just
> sensational. I took buffers down to 4 and suspect I could go lower.
> This plays like an electronic organ there is no delay. I was not able
> to detect any polyphony limit or drop out even on heavy registrations
> with couplers and many notes held. I had polyphony set at 1024 on each
> of 3x instances of Fluidsynth.
>
> Regards
> Rick
> ****************************
>
>
>     ----- Folgende Nachricht wurde empfangen -----
>
>     *Absender:* David Henningsson <mailto:address@hidden>
>     *Empfänger:* fluid-dev <mailto:address@hidden>
>     *Zeit:* 2010-09-12, 22:14:27
>     *Betreff:* Re: [fluid-dev] FS 1.1.2 alpha sound rendering issue
>     2010-09-12 18:32, Bernd Casper skrev:
>     > Hi David,
>     >
>     > some days ago I reported about strange crackling effects using
>     single waveforms. With the new jOrgan release (containing FS 1.1.2
>     final) the effect appears on other machines, too. Please have a
>     look at the thread in the jOrgan user list:
>     >
>     
> http://jorgan.999862.n4.nabble.com/jOrgan-3-11-first-beta-td2535918.html#a2535918
>
>     Right, so I fixed ticket 86 and I've done a small optimization (svn
>     revision 369) by not starting threads if they are not likely to be
>     used.
>     That optimization could have as side effect that this problem is now
>     solved, but I'm not certain as I don't really understand how it
>     appears.
>
>     Could you check if it is fixed in the latest svn, and if it is not,
>     report whether the synth.cpu-cores option has any effect on
>     whether the
>     bug appears or not?
>
>     Thanks,
>       // David
>
>
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