Re: [AD] Allegro fails to initialize sound under Pulseaudio

[Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx>]

On Sun October 21 2007, Elias Pschernig wrote:
> On Sun, 2007-10-21 at 03:10 -0600, Thomas Fjellstrom wrote:
> > > It would be easy to add a sign conversion pass to Allegro's mixer as
> > > well of course. Basically, in
> > > https://alleg.svn.sourceforge.net/svnroot/alleg/allegro/branches/4.3.10
> > >plus /src/unix/alsa9.c provide another copy of alsa_mix which has an
> > > extra loop over the
> > > sample buffer and converts to unsigned. On driver initialization, it
> > > could be decided if the normal function or the one with conversion
> > > (slightly slower) should be used. E.g. the jack driver always does a
> > > conversion like that since it only understands signed data.
> >
> > Really? I find it really odd that a sound server, thats meant to pipe and
> > mix many sound streams and formats can only handle signed data.. Just
> > seems wrong to me. :o
>
> Yes, it's because it only supports 32-bit (and 64-bit I think) float
> samples and nothing else - at least from what I remember when writing
> the driver. Their goal was not to support different formats, but to have
> as low latency as possible (e.g. the docs even disallow calling
> pthread_mutex_lock inside the mixer callback - even though I simply call
> _mix_some_samples which does that and it still seems to work).

I still don't get the point of that, force everything else to mix to it? so 
the mixing is bottle necked in the clients instead?

> --
> Elias Pschernig <elias@xxxxxxxxxx>
>
>
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-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx