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

[Steven Brown <steven.w.j.brown@xxxxxxxxxx>]

I think I found the problem and I've updated the ticket:   
http://www.pulseaudio.org/ticket/133

It seems that Allegro requests unsigned formats, which are not supported 
by PulseAudio.  (See the ticket for more details.)  Adding support to 
PulseAudio has been discussed briefly, but I'm not sure when (or if) it 
will happen.


Elias Pschernig wrote:
> On 10/4/07, Steven Brown <steven.w.j.brown@xxxxxxxxxx> wrote:
>   
> > Hey all,
> >
> > FYI: Pulseaudio, formerly Polypaudio, is a sound server meant as an
> > replacement for ESD.  It's gaining a lot of ground in the linux desktop
> > space.
> >
> >     http://pulseaudio.org/wiki/AboutPulseAudio
> >
> > Anyways, I was testing a game that uses Allegro the other day, and
> > discovered that it fails to initialize sound.  Allegro detects and tries
> > to initialize using ALSA, which is fine, as Pulseaudio has an ALSA
> > plugin.  But it fails, which is less fine.  :P
> >
> > I've filed a bug with the Pulseaudio people here:
> >
> >     http://www.pulseaudio.org/ticket/133
> >
> > (It includes a simple sound initialization application and output from
> > my computer.)
> >
> > After talking with someone from #pulseaudio, he said that it may have
> > something to do with Allegro requesting ALSA in MMAP mode, which the
> > ALSA plugin for Pulseaudio does not support.  Also, forcing Allegro to
> > initialize with ESD works with Pulseaudio, but it is *much* too laggy
> > and certainly unusable in any game.
> >
> > I just thought I should let you know, if anyone here has an idea to the
> > problem.  :)
> >     
>
> The source code for our alsa driver is here:
> https://alleg.svn.sourceforge.net/svnroot/alleg/allegro/branches/4.3.10plus/src/unix/alsa9.c
>
> I can't see anything which requires MMAP mode, but I wouldn't know for
> sure. There's one single call to snd_pcm_hw_params_set_format. Maybe
> you could figure out which parameters make it fail? It's possible we
> ask for something too strict or something like that..
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
>