Re: cannot adjust audio balance with OSS on old iBook
On Saturday 19 July 2003 9:34, Frank Murphy wrote:
> > > Others seeing this? Any ideas where this problem might lie? Because it
> > > happens in two audio apps, I imagine it's a lower-level problem. Anyone
> > > seeing the same thing with ALSA?
> >
> > Is this one of the round clamshell-style iBooks? I don't think I was
> > able to discern from the DACA mixer-control code I used as a reference
> > how to do it, so I just never took separate channels into account for
> > the DACA mixer-control code when I wrote that stuff. (Frankly, I was so
> > happy to have mixer control at the time, balance control didn't really
> > cross my mind.) I'm guessing no one's played with it since then.
>
> Yeah, it's one of the grey-and-white 1 1/2 generation iBooks. Most of the
> hardware is the same, just a slightly faster processor and bigger HD.
>
> So I started messing around to get ALSA on this box. Took a while, and the
> sound was not very good (pops and things). However, I installed alsaplayer,
> and when using it with oss, the balance controls work properly. It seems
> that both aumix and xmms have the same bug. But the device works like it
> should.
Some new info here, for anyone interested. Seems that this balance problem
*is* a problem with the hardware mixer driver. Both xmms and aumix show the
problem because they open /dev/mixer directly. alsaplayer does not, so must
be doing its balance adjustment in software, and so doesn't see the problem.
I suspect that this doesn't matter because ALSA is the audio driver for the
2.6 kernel, though the balance for ALSA on PPC doesn't seem perfect either.
Anyway, FYI.
Frank
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