13 Jun
2015
13 Jun
'15
4:01 a.m.
Does anybody know if there is any way to pull up/down with JACK? And if there
is, can ALSA deal with it very gracefully?
-Reuben
13 Jun
13 Jun
4:05 a.m.
On Fri, Jun 12, 2015 at 10:02 PM, Reuben Martin <reuben.m(a)gmail.com> wrote:
Does anybody know if there is any way to pull up/down
with JACK? And if
there
is, can ALSA deal with it very gracefully?
There's no way to do this.
Ardour does pull up/down but it has nothing to do with JACK or ALSA.
6:27 p.m.
On Friday, June 12, 2015 10:05:19 PM Paul Davis wrote:
On Fri, Jun 12, 2015 at 10:02 PM, Reuben Martin
<reuben.m(a)gmail.com> wrote:
How is this achieved? Does it actually work internally at a different sample
rate and then resample the playout to the hardware sink, or does it work at a
standard rate and up/down the sample rate upon export? Or perhaps I completely
misunderstand the mechanics of how this is achieved...
Does anybody know if there is any way to pull
up/down with JACK? And if
there
is, can ALSA deal with it very gracefully?
There's no way to do this.
Ardour does pull up/down but it has nothing to do with JACK or ALSA. 
15 Jun
15 Jun
1:33 p.m.
On 06/13/15 04:02, Reuben Martin wrote:
Does anybody know if there is any way to pull up/down
with JACK? And
if there is, can ALSA deal with it very gracefully?
While you cannot do pull-up/down with jack, you can at least do it on
(most) RME cards on the ALSA side.
If you have a card with a TCO option, the pull controls are directly
exposed to ALSA.
For non-TCO cards, you can set the system sample rate with 1Hz
granularity via the "System Sample Rate" control.
And while jackd blindly believes in the 48000 it originally requested,
you're actually running at whatever you want. ;)
I've implemented it in the HDSPM driver. If you happen to have a card
that uses HDSP instead, I'm somewhat confident it could be ported.
Here's the code in question:
http://lxr.free-electrons.com/source/sound/pci/rme9652/hdspm.c?v=3.19#L2229
Cheers
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participants (3)
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Adrian Knoth -
Paul Davis -
Reuben Martin