Re: [hatari-devel] Bad sound in Monscape demo

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 5.12.2022 23.23, Nicolas Pomarède wrote:
> Le 05/12/2022 à 21:22, Laurent Sallafranque a écrit :
....
> > Under hatari, the sound plays OK, but after some times, it starts to 
> > glitch and crackle, and again, after some time, it becomes good again, 
> > ... It's a cyclic event (maybe a sinusoidal event, when sound goes 
> > from perfect to glitchy).
> >
> >
> > I think some Falcon demos with glitchy sound are using this 0 0 0 
> > technic to mix.
....
> when doing the ym2149 clock improvement with no roundings for 2.4.1
> https://git.tuxfamily.org/hatari/hatari.git/commit/?id=f91714f2903679186431b23a7cf57f91efa37ee8
>
> I fixed some cases where floating point was used to replace them with 
> integer math where errors is accumulated to keep it at the lowest level.
>
> there're still many places in falcon crossbar where floating point math 
> is used, I think they should be replaced too to improve sound quality.
>
> Can't tell if this will fix the problem reported by you en Eero, but 
> it's certainly a needed fix.

Monscape is a TT demo running in TT-high mode, not a Falcon one.


> > Le 05/12/2022 à 20:06, Eero Tamminen a écrit :
> > > I have bad sound in (Sommarhack 2022) "Monscape" demo:
> > > https://www.pouet.net/prod.php?which=91818
> > >
> > > With latest Hatari Git version.
> > >
> > > Drums and bass in the music are very scratchy compared to the clean 
> > > sound in the demo video:
> > > https://www.youtube.com/watch?v=wSk9JtcL4TE
> > >
> > > This is not a regression, I hear same bad sound also with Hatari v2.3.1.


	- Eero