[LAD] JACK on Gigaport HD+ at 4800kHz (reduced channel count)
paul at linuxaudiosystems.com
Tue Feb 25 15:09:16 UTC 2014
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
> > > 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.
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