* Re: Fwd: [was Re: [linux-audio-user] Multiple (three) RME Hammerfalls... any experience]
2003-11-29 12:32 ` Fwd: [was Re: [linux-audio-user] Multiple (three) RME Hammerfalls... any experience] Patrick Shirkey
@ 2003-11-29 15:10 ` Paul Davis
2003-11-29 15:13 ` Jeremy Hall
1 sibling, 0 replies; 3+ messages in thread
From: Paul Davis @ 2003-11-29 15:10 UTC (permalink / raw)
To: Patrick Shirkey; +Cc: A list for linux audio users, alsa-devel
>> I can't help you much, however, unless JACK has
>> recently been worked on I think there's a 32 track
>> limitation. It's known to be technically trivial.
still in place at this time. there is a simple 1-2 line solution; i'm
not sure if its the right one, since it simply substitutes a 64
channel limit.
>> Midi Time Code syncronization in Ardour could also be
>> problematic, it doesn't work with my Tascam DM-24.
>> Even though transport location is accurate, the
>> automation system can't interpret Ardour mtc. Paul has
>> announced his intention to implement SMPTE but I'm not
>> sure if that's been done yet.
yes, to repeat a familiar refrain these days, being an MTC master
on an unpatched linux system is, to the best of my knowledge,
fundamentally impossible. your other systems will chase the linux
master, but will not lock to it.
>> I wonder what the status of 96kHz adat is with the
>> hammerfall drivers.
for the hdsp, its know to work fine. the digi9652 works, but it may
require some work to configure the device properly. sorry i don't
remember more (and i'm the author .. :)
>>>The problem is that we have to transfer a few hours
>>>of 72-channel music
>>>from three synced Mackie SDR24/96's to a harddisk. I
>>>don't really know
>>>what format the music is recorded in.
>>>
>>>As my colleague is unable to use three RME
>>>Hammerfall DSP card's in his
>>>dual G4 powermac with OSX (don't know exact
>>>version), I wondered if I
>>>could use Linux to capture the music to harddisk.
>>>
>>>If anybody has any experience, please let me know.
>>>Otherwise we will
>>>proceed with one card and thus 24 channels at a
>>>time, which does work.
i personally think you will have a much easier time doing it one card
at a time. there is nothing about ALSA that will stop you from trying
this, assuming as ron noted that you wordclock-sync all 3 cards. but
you will also be streaming a large amount of data to disk (on the
order of 13MB/sec at 48kHz, twice that at 96kHz), and you will need a
pretty robust disk subsystem to manage this flawlessly.
--p
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Fwd: [was Re: [linux-audio-user] Multiple (three) RME Hammerfalls... any experience]
2003-11-29 12:32 ` Fwd: [was Re: [linux-audio-user] Multiple (three) RME Hammerfalls... any experience] Patrick Shirkey
2003-11-29 15:10 ` Paul Davis
@ 2003-11-29 15:13 ` Jeremy Hall
1 sibling, 0 replies; 3+ messages in thread
From: Jeremy Hall @ 2003-11-29 15:13 UTC (permalink / raw)
To: Patrick Shirkey; +Cc: A list for linux audio users, alsa-devel
You're actually going to want 6 RME9652's if you want 72 channels at 96.
In jackd/engine.c, change engine->port_max to 512. I think you won't need
all of those, I think you'll need 304.
You can slave them together using pcm_multi as long as they're all linked
with a master clock, alsa won't do it for you. Look for pcm.rme9652_96 in
the archives, and if it's not there, I'll send it again. Be sure to use
recent alsa, because syncing multiple cards kicked off a code change that
prevented lockups. I'd be interested to know how low you could set your
latency before jack kicks something out.
_J
In the new year, Patrick Shirkey wrote:
> I have forwarded this to alsa-devel as there is probably more luck
> finding the answer here and it would be a valuable thread to have as a
> resource.
>
> R Parker wrote:
> > Hi,
> >
> > I can't help you much, however, unless JACK has
> > recently been worked on I think there's a 32 track
> > limitation. It's known to be technically trivial.
> > Otherwise I don't believe alsa would be a problem,
> > assuming you've got wordclock i/o on the hammerfall
> > cards.
> >
> > Midi Time Code syncronization in Ardour could also be
> > problematic, it doesn't work with my Tascam DM-24.
> > Even though transport location is accurate, the
> > automation system can't interpret Ardour mtc. Paul has
> > announced his intention to implement SMPTE but I'm not
> > sure if that's been done yet.
> >
> > I wonder what the status of 96kHz adat is with the
> > hammerfall drivers.
> >
> > Anyway, that's not much help. Sorry.
> >
> > ron
> >
> > --- Ronald van Engelen <ronalde@xs4all.nl> wrote:
> >
> >>Hi,
> >>
> >>After rereading my message, I saw too many
> >>unclarities and typos, so
> >>I'll try again.
> >>
> >>The problem is that we have to transfer a few hours
> >>of 72-channel music
> >>from three synced Mackie SDR24/96's to a harddisk. I
> >>don't really know
> >>what format the music is recorded in.
> >>
> >>As my colleague is unable to use three RME
> >>Hammerfall DSP card's in his
> >>dual G4 powermac with OSX (don't know exact
> >>version), I wondered if I
> >>could use Linux to capture the music to harddisk.
> >>
> >>If anybody has any experience, please let me know.
> >>Otherwise we will
> >>proceed with one card and thus 24 channels at a
> >>time, which does work.
> >>
> >>Thanks,
> >>Ronald van Engelen
> >>
> >>
> >>Op vr 28-11-2003, om 20:06 schreef Ronald van
> >>Engelen:
> >>
> >>>Hi there,
> >>>
> >>>A colleague of mine is having major problems using
> >>
> >>multiple (three) RME
> >>
> >>>Hammerfall cards using Mac OS 9 and X and
> >>
> >>consulted me for help.
> >>
> >>>The problem is that he has to transfer a few hours
> >>
> >>of 72-channel music
> >>
> >>>(recorded with Mackie HDR's) to his harddisk for
> >>
> >>further mixing and
> >>
> >>>processing.
> >>>
> >>>I only have experience with (single and dual)
> >>
> >>stereo cards using alsa,
> >>
> >>>jack, ardour and ladspa. I wonder if anybody have
> >>
> >>experience with
> >>
> >>>multiple RME cards using alsa, and particullary
> >>
> >>experience doing such a
> >>
> >>>task with mentioned tools?
> >>>
> >>>I haven't had the chance to examine his
> >>
> >>(Mac-related) problem but it
> >>
> >>>sounds like he might suffering from problems
> >>
> >>related to his
> >>
> >>>power-supply?
> >>>
> >>>Regards,
> >>>Ronald van Engelen
> >>>
> >>>
>
>
> --
> Patrick Shirkey - Boost Hardware Ltd.
> Http://www.boosthardware.com
> Http://www.djcj.org - The Linux Audio Users guide
> ========================================
>
>
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^ permalink raw reply [flat|nested] 3+ messages in thread