[LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel count)

[Paul Davis]

On Tue, Feb 25, 2014 at 9:41 AM, Fons Adriaensen <fons at linuxaudio.org>wrote:

> On Tue, Feb 25, 2014 at 08:39:14AM -0500, Paul Davis wrote:
> > On Tue, Feb 25, 2014 at 8:25 AM, Jörn Nettingsmeier <
> > nettings at stackingdwarves.net> wrote:
> >
> > >
> > > If the maximum channel count is always fixed by the hardware, what is
> the
> > > point of the corresponding jackd option? As I said, I don't remember if
> > > ever doing something other than throwing the "cannot set channel count"
> > > error...
> >
> >
> > imagine you have an N (where N > 16) channel device but only channels 1-4
> > are connected. the channel count option stops you from having to look at
> > N-4 useless channels on the device all the time.
>
> AFAIK, when using the MMAP access mode, you always get the full channel
> count. Which makes sense, since what gets mapped into user space may
> very well be an actual HW buffer having a fixed layout (which may be
> interleaved, complex-interleaved, etc.)
>

the option doesn't alter what the JACK backend sees from ALSA (or
wherever). it changes which channels get represented by JACK ports.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxaudio.org/pipermail/linux-audio-dev/attachments/20140225/cf819a78/attachment.html>