Re: snd-powermac produces only low quality dirty so

[Olaf Hering <olh@suse.de>]

 On Wed, Dec 15, danny@mailmij.org wrote:

> On Wed, 15 Dec 2004, Giuliano Pochini wrote:
> 
> > 
> > On 14-Dec-2004 Olaf Hering wrote:
> > 
> > > All 2.6 versions I tried so far produce only "dirty" low quality sound
> > > when playing mp3 with xmms with either the alsa or oss plugin.
> > > But it works as expected when I use dmasound_pmac and the liboss plugin.
> > >
> > > Any ideas how to debug it?
> > 
> > It seems that the chip is not happy with some period/buffer sizes.
> > Someone was trying to find the right constraints to set for those
> > parameters. Maybe the attached patch fixes it (untested).
> > 
> O yes, I forgot to send it. Will do later tonight. It doesn't have to be a 
> power of 2 though, at least not on my Snapper.
> However, the problem never occured with oss emulation, so I doubt above 
> problem is the same. Low quality sound was happening a few versions ago, 
> but latest ALSA produces very reasonable sound, only distortion when 
> I turn up PCM too much (and DRC Range is set high).

You are right, reducing the volume to 80% in xmms fixes it and the mp3
sounds ok.


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