11 Dec
2009
11 Dec
'09
7:28 a.m.
On Mon, Dec 07, 2009 at 01:48:04AM -0600, Reuben Martin wrote:
On Sun, Dec 6, 2009 at 4:14 AM, Patrick Shirkey
<pshirkey(a)boosthardware.com> wrote:
i fixed an issue with windows in netone.
seems like i can get down to around 26ms roundtrip latency with not many
netxruns.
50ms seems to be stable.
note that i am not running the VM SCHED_FIFO.
these tests are done with win7 in a VirtualBox
the host period size is 256. i guess using 1024 would be better.
these big latencies are not a real problem, when you use sequencers.
netjack1 provides a latency compensated jack Transport on the slave
side.
Note that there is an asio adapter for jack on windows.
so the missing part is getting the jack transport into a windows
app. i have written jack_trans2midi which generates midi clock.
so you just need some virtual midi device.
http://www.youtube.com/watch?v=J0WnR0O-4g8
maybe i should redo this video with bigger console fonts :)
i needed to use a quite big latency due to some bugs and the socket
buffer size of windows being much too small.
these bugs should be fixed now.
i just need to update the celt and then i will roll a jacknone release.
On 12/06/2009 03:20 PM, Reuben Martin wrote:
No problems yet. I'm putting together a new system and had thought of
using Windows and Mac as guest VM systems under KVM for running things
that don't exist for Linux and/or don't work well with WINE. And I
wanted to see if anybody had tried routing the VM audio ins / outs to
JACK rather than directly to an audio sink.
Wanted to see if anybody had seriously tried this before I gave it a go. On Sat, Dec 5, 2009 at 8:39 PM, Paul
Davis<paul(a)linuxaudiosystems.com> wrote:
If KVM already supports those api's then it can be used with jack via
several different methods. What is the problem that you are having exactly?
On Sat, Dec 5, 2009 at 2:51 PM, Reuben
Martin<reuben.m(a)gmail.com> wrote:
> Does anybody know if it is possible to run a guest OS under KVM and
> have the ins and outs of the virtual audio device presented to that
> OS, interface with JACK on the host linux system?
>
> I've done a little googling on this but couldn't find anything.
> (mostly because "jack" is ambiguous, and "KVM" can mean a lot of
> things)
>
unless the VM software that provides fake audio devices to the guest
OS knows about JACK internally or can be configured to use it, this is
not happening.
on the other hand, if the VM software can simply use the ALSA JACK
plugin, that could potentially work (lots and lots of latency though).
In that case I guess my best bet would probably be to petition KVM
development to add support for JACK. Currently I believe it supports
ALSA, OSS, SDL and PulseAudio.
-Reuben
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torben Hohn