Kernel support for 24-bit sound

Kernel support for 24-bit sound

[Pigeon]

I am trying to add support for the 24-bit S/PDIF input mode of my
CMI8738 sound card to the cmpci.c driver of kernel 2.4.20.

I am hindered in this chiefly by lack of documentation.

If someone could supply me with the URL of some documentation
on kernel sound handling it would be much appreciated.

I am also somewhat worried that none of the valid arguments listed for
the SNDCTL_DSP_SETFMT ioctl seem to be for any kind of 24-bit format.
Is there in fact any kernel support for 24-bit sound in general?

Please CC me on replies; I'm on dialup and I can't cope with the
traffic on this list.

Many thanks

Pigeon

Re: Kernel support for 24-bit sound

[Alan Cox]

On Sul, 2003-04-06 at 17:23, Pigeon wrote:
> I am trying to add support for the 24-bit S/PDIF input mode of my
> CMI8738 sound card to the cmpci.c driver of kernel 2.4.20.

2.4.21pre -ac and I think now base trees have 24bit support in the
core code included and support for 24bit USB devices added. OSS 
doesn't really think happily in 24bit mode and the apps don't know
about it either. The ALSA layer in 2.5.x is a rather nicer replacement
without a lot of the limitations

Re: Kernel support for 24-bit sound

[Pigeon]

On Sun, Apr 06, 2003 at 05:29:01PM +0100, Alan Cox wrote:
> On Sul, 2003-04-06 at 17:23, Pigeon wrote:
> > I am trying to add support for the 24-bit S/PDIF input mode of my
> > CMI8738 sound card to the cmpci.c driver of kernel 2.4.20.
> 
> 2.4.21pre -ac and I think now base trees have 24bit support in the
> core code included and support for 24bit USB devices added. OSS 
> doesn't really think happily in 24bit mode and the apps don't know
> about it either. The ALSA layer in 2.5.x is a rather nicer replacement
> without a lot of the limitations

Many thanks, that is extremely useful, have downloaded
2.4.21-pre5-ac3. Nice one!

Pigeon