16 Feb
2011
16 Feb
'11
9:14 p.m.
Is there such thing? It is not my question, it saw it on irc. And really could not find
nothing.
16 Feb
16 Feb
10:28 p.m.
On Wed, Feb 16, 2011 at 11:14:21PM +0300, Mike Cookson wrote:
Is there such thing? It is not my question, it saw it
on irc. And really could not find nothing.
Not sure I understand the question fully.
If you are using JACK-based apps, you will always want
JACK running, whichever audio device is available.
If your apps don't require JACK, then why bother to use it?
It sounds like you want some facility to run
JACK under certain conditions. I believe there
are some hooks in udev that will let you
run a script, for example when a firewire device
is plugged in. That script could start jackd.
You don't mention the type of app; if it's a
recorder/player/mixer thing, Nama (based on Ecasound)
automatically *detects* JACK, falling back to ALSA if
necessary.
cheers,
--
Joel Roth
17 Feb
17 Feb
7:16 a.m.
New subject: [LAU] Jack fallback to alsa when firefire device off?
Wed, 16 Feb 2011 11:27:42 -1000 письмо от Joel Roth <joelz(a)pobox.com>om>:
On Wed, Feb 16, 2011 at 11:14:21PM +0300, Mike Cookson
wrote:
I mean feature, that if
firewire device is off, jack should switch to alsa - like it switches to dummy on
suspend.
Is there such thing? It is not my question, it
saw it on irc. And really
could not find nothing.
Not sure I understand the question fully.
If you are using JACK-based apps, you will always want
JACK running, whichever audio device is available.
If your apps don't require JACK, then why bother to use it?
It sounds like you want some facility to run
JACK under certain conditions. I believe there
are some hooks in udev that will let you
run a script, for example when a firewire device
is plugged in. That script could start jackd.
You don't mention the type of app; if it's a
recorder/player/mixer thing, Nama (based on Ecasound)
automatically *detects* JACK, falling back to ALSA if
necessary.
cheers,
--
Joel Roth
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user 
7:18 a.m.
Hehe jack switch to Alsa .... Funny!
Thnx
Ron
Indamixx
On Thursday, February 17, 2011, Mike Cookson <cook60020tmp(a)mail.ru> wrote:
Wed, 16 Feb 2011 11:27:42 -1000 письмо от Joel Roth <joelz(a)pobox.com>om>:
On Wed, Feb 16, 2011 at 11:14:21PM +0300, Mike
Cookson wrote:
I mean feature, that if
firewire device is off, jack should switch to alsa - like it switches to dummy on
suspend.
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
Is there such thing? It is not my question, it
saw it on irc. And really
could not find nothing.
Not sure I understand the question fully.
If you are using JACK-based apps, you will always want
JACK running, whichever audio device is available.
If your apps don't require JACK, then why bother to use it?
It sounds like you want some facility to run
JACK under certain conditions. I believe there
are some hooks in udev that will let you
run a script, for example when a firewire device
is plugged in. That script could start jackd.
You don't mention the type of app; if it's a
recorder/player/mixer thing, Nama (based on Ecasound)
automatically *detects* JACK, falling back to ALSA if
necessary.
cheers,
--
Joel Roth
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user 
1:23 p.m.
On 02/17/2011 07:16 AM, Mike Cookson wrote:
Wed, 16 Feb 2011 11:27:42 -1000 письмо от Joel Roth
<joelz(a)pobox.com>om>:
> On Wed, Feb 16, 2011 at 11:14:21PM +0300, Mike Cookson wrote:
>> Is there such thing? It is not my question, it saw it on irc. And
>> really
> could not find nothing.
>
> Not sure I understand the question fully.
>
> If you are using JACK-based apps, you will always want JACK
> running, whichever audio device is available. If your apps don't
> require JACK, then why bother to use it?
>
> It sounds like you want some facility to run JACK under certain
> conditions. I believe there are some hooks in udev that will let
> you run a script, for example when a firewire device is plugged in.
> That script could start jackd.
>
> You don't mention the type of app; if it's a recorder/player/mixer
> thing, Nama (based on Ecasound) automatically *detects* JACK,
> falling back to ALSA if necessary.
>
> cheers,
>
>
> -- Joel Roth
I mean feature, that if firewire device is off, jack
should switch to
alsa - like it switches to dummy on suspend.
The problem is that JACK will shut-down or crash when you disconnect the
device, before any HAL (udev) can react and tell JACK to switch back-ends.
Possible options and solutions to this have been discussed on the
JACK-devel list end of 2010 but nothing has been implemented, yet.
The largest concern is that there is no way of knowing how to retain and
map port connections. e.g. the 1394 devices may have 8 in/out while the
build-in ALSA only has two; there are other details too (e.g.
sample-rate, device config, etc)
It may be an option to run JACK on top of pulseaudio, and have
pulseaudio switch the devices, but this is just a kludge and not
recommended in any way.
ciao,
robin
--
Robin Gareus
web: http://gareus.org/ mail: robin(a)gareus.org
lab: http://citu.fr/ chat: xmpp:rgareus@ik.nu
Public Key at http://pgp.mit.edu/ http://gareus.org/public.asc
Fingerprint : 7107 840B 4DC9 C948 076D 6359 7955 24F1 4F95 2B42
8:40 a.m.
On Wed, 2011-02-16 at 23:14 +0300, Mike Cookson wrote:
Is there such thing? It is not my question, it saw it
on irc. And
really could not find nothing.
Jackdbus has the ability to switch backends on command, so you might be
able to cobble something together with udev scripts.
Depends if jackdbus will survive the interval between the device being
removed and the switch being issued.
Peter.
4842
days inactive
4843
days old
linux-audio-user@lists.linuxaudio.org
6 comments
5 participants
participants (5)
-
Joel Roth -
Mike Cookson -
Peter Nelson -
Robin Gareus -
Ronald Stewart