Re: [PATCH] snd-via82xx: Support all sample rate conversion capabilities of DXS channels

[Sergey Vlasov <vsu@altlinux.ru>]

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On Mon, Apr 11, 2005 at 04:06:06PM +0200, Takashi Iwai wrote:
> At Sun, 10 Apr 2005 19:53:20 +0400,
> Sergey Vlasov wrote:
> > Add support for full sample rate conversion capabilities of DXS
> > channels present in VIA VT8233/5/7 controllers:
> > 
> > - any sample rate in the 8000 ... 48000 Hz range is supported even if
> >   the AC'97 codec supports only 48000 Hz output;
> > 
> > - different DXS channels can use different sample rates at the same
> >   time (the controller performs required sample rate conversion and
> >   mixing in hardware).
> 
> Thanks.  I applied it to CVS.
> 
> If I understand correctly, this feature should be available on all
> machines with dxs_support=4, but you added a new dxs_support entry
> just to be sure not to break, right?

Yes, it should work, but this driver was broken too many times in the
past (and some Linux distributions still select via82cxxx_audio instead of
snd-via82xx by default because of this).  On the other hand, this means
that many existing entries with VIA_DXS_NO_VRA will just stay that way,
because the driver will not give any messages to try dxs_support=5.

In fact, I wonder how dxs_support=1 could work at all, if the controller
resamples everything to 48000, but the codec is configured to use some
other rate.  Some hardware must be broken to make this work :)

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