Re: [hatari-devel] MIDI slowness issue in Atari forum?

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

Thanks for the video!

Are you using PortMidi or raw MIDI device file build of Hatari?

(I.e. do you give Hatari a device name, or device file path?)

And which Hatari, SDL2 and PortMidi version is being used?


	- Eero

On 1.5.2025 8.07, D C wrote:
> Haven't been following hatari these days but noticed this in my junk email and haven't been on the forum for a while (can't login anymore for some reason).
>
> But I was curious and tested it out on a real machine at the same time as hatari on android and the timing seems to be in sync for me.
>
> Falcon -> usb midi -> linux (fluidsynth)
>
> I turn off the volume on the tablet every now so it's easier to hear that it's in sync.
> (there's an occasional random note from linux-fluidsynth maybe caused by linux on my laptop)
>
> https://mega.nz/file/GxU1CD4Q#GuIdhHdoozwWC8ZqrzMIaHlp_KrGScfs7c5aDNzJndQ
>
>
> ________________________________
> From: Nicolas Pomarède <npomarede@xxxxxxxxxxxx>
> Sent: Tuesday, 22 April 2025 6:34 AM
> To: hatari-devel@xxxxxxxxxxxxxxxxxxx <hatari-devel@xxxxxxxxxxxxxxxxxxx>
> Subject: Re: [hatari-devel] MIDI slowness issue in Atari forum?
>
> Le 21/04/2025 à 19:43, Eero Tamminen a écrit :
> > Hi,
> >
> > Does anybody have any idea about the possible reasons why MIDI from
> > Hatari would be _consistently_ too slow on some setups:
> > https://www.atari-forum.com/viewtopic.php?p=477795#p477795
> >
> > ?
>
> Hi
>
> I saw this thread, but I don't really know what could cause this. I
> barely use midi myself, so I can't compare with my own experience. On
> the other hand some users are reporting correct MIDI when using hatari.
>
> So,
>    - either his setup is too slow somehow and he needs a more powerful PC,
>    - or there's an issue with some of the libs he uses on his RPi5 that
> creates problem when writing to the emulated midi port
> - or there's a very specific use of the acia register at fffc04/06 that
> would not be correctly emulated (there were some very low level timings
> fixed a long time ago to make 'Notator' works, but since then no one
> reported any problem). And the problem was it was loosing some bytes,
> not playing everything too slow.
>
> What could be interesting would be to run the same test as he does but
> on a "normal" Linux PC and see if the same slow down can be observed,
> (with someone doing this test having a midi setup known to work
> correctly already with Hatari)
>
> Nicolas