Re: [hatari-devel] Re: PortAudio replaced

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Thomas,


Can you try

#define FRAMES_PER_BUFFER 4096  // instead of 512

to see if the sound with SDL2 is better (I see this value very often in 
examples).

Regards

Laurent



Le 11/01/2022 à 19:13, Laurent Sallafranque a écrit :
> Hi thomas,
>
>
> I've done many tries yesterday evening without success for now.
>
> I've forced the microphone in hard in the code, I've forced 
> frequencies, added some printf, read about SDL sound recording, ...
>
>
> There must be a little something, but I still haven't found what.
>
> I continue to investigate.
>
> Regards
>
> Laurent
>
>
>
> Le 11/01/2022 à 17:49, Thomas Huth a écrit :
> > Am Mon, 10 Jan 2022 00:11:51 +0100
> > schrieb Laurent Sallafranque <laurent.sallafranque@xxxxxxx>:
> >
> > > Hi,
> > >
> > > I'll try to complete my reply:
> > >
> > > > 1) Which Linux distro and which SDL version are you using?
> > > Distro: Ubuntu 20.04.3 LTS
> > > sdl :     using SDL2 v2.0.10
> > Ok, thanks, so that should be fine, I guess. I read somewhere about
> > problems with microphone input in SDL versions < 2.0.5, but I don't
> > think that these versions are still in use these days (i.e. in
> > maintained distros).
> >
> > > > 2) Do you have multiple microphone inputs on your computer? E.g. a
> > > > direct mic on the Laptop and one in the dock? If so, could it be
> > > > that SDL uses a different default mic than PortAudio?
> > > Yes, at least 1 mic in front and another one at the rear of the
> > > computer.
> > >
> > > And the headphone I use for my tests is an USB one with a microphone.
> > Could you please check whether the input now comses from one of these
> > other inputs? Maybe we need to add an input selector now...
> >
> > > > are these freely available somewhere?
> > > You can find them here (I don't know if it's free or not, but at
> > > least, it's for testing purpose).
> > >
> > > If you test with AFM, just stop the equalizer (it makes a very
> > > glitchy sound, I've never found why).
> > >
> > > http://christophe.bray.free.fr/informatique/falcon/archives/atari_falcon_musique.htm 
> > Thanks! I've checked them now, and for me they work with both, SDL and
> > PortAudio. However, sound quality seems to be a bit worse with SDL, so
> > that needs some more fine tuning at least...
> >
> > > I can record the sound (tomorrow) if you want.
> > Thanks, but that likely does not help much to debug this issue... I
> > guess I'll better revert the patch for now until the problem is
> > understood...
> >
> >   Thomas