C-Media 9739 codec - solution found

C-Media 9739 codec - solution found

[David Monniaux]

I found a solution at last...

C-Media proposes a Linux driver at
http://www.cmedia.com.tw/driver/Linux/Ac97/cmaudio-034.tar.gz

This driver works well with 2.4.20.

Who maintains the i810_audio / AC97-related things? I think the C-Media 
driver should be folded into the regular kernel (otherwise it won't get 
maintained).

Regards,
D. Monniaux

Re: C-Media 9739 codec - solution found

[Alan Cox]

On Fri, 2003-02-28 at 03:04, David Monniaux wrote:
> This driver works well with 2.4.20.
> 
> Who maintains the i810_audio / AC97-related things? I think the C-Media 
> driver should be folded into the regular kernel (otherwise it won't get 
> maintained).

A lot of it duplicates existing functionality we have and in a different
way. Nothing wrong with the way they have done it but it does make merging
that kind of thing hard. The Linux ac97 code has digital control ops that
very few codecs use. It should be possible to populate those from this
and this code also has a few oddments about the sis7012/18 that may help
fix some stuff [We don't have SiS docs]

Re: C-Media 9739 codec - solution found

[David Monniaux]

On 28 Feb 2003, Alan Cox wrote:

> > This driver works well with 2.4.20.

Woops. I think I have said this too quickly. There seem to be some weird
behaviors with some applications (sounds like playing a 44.1 kHz buffer at
48 kHz, some cyclical "thud"). More too come when I have time to look at
the matter more closely.

Re: C-Media 9739 codec - solution found

[David Monniaux]

On 28 Feb 2003, Alan Cox wrote:

> > Who maintains the i810_audio / AC97-related things? I think the C-Media 
> > driver should be folded into the regular kernel (otherwise it won't get 
> > maintained).
> A lot of it duplicates existing functionality we have and in a different

I have spoken too fast too soon. The C-Media driver has some issues (some
weird sound glitches), sounding like it plays 48 kHz at while pretending
to use 44.1 kHz, using xmms.

I'll look into it ASAP.

David Monniaux            http://www.di.ens.fr/~monniaux
Laboratoire d'informatique de l'École Normale Supérieure,
Paris, France