winealsa: improve sound quality for IDsDriverImpl

[Jerry Jenkins]

> Robert Reif wrote:
> >
> > Here is the patch that addresses the 8 bit mixer problem.  I just
> > cut it out of an old development tree that had a lot of other mixer
> > changes so I doubt it will apply cleanly but it will give you an idea
> > of the problem.
> >
> > This patch and the tests developed for it uncovered the locking
> > issues which I have not fixed yet.  I hope to submit a real fix for
> > all this someday but I hope this partial fix can be of some use
> > until then.
> >
> Seems there are too few EnterCriticalSections to make things better. Hope
> you can complete it soon.
>
> I guess that adding critical sections can synchronize DSOUND, but the
> sound driver - playing thread - remains unchanged,  it still goes its own
> way:-(.
>
Sorry, here is the missing text.

What will happen if the driver access the data we are going to clean or mix?
I wish it would never take place.