29 Oct
2002
29 Oct
'02
11:17 a.m.
Hi,
Fundamental question - Does alsa support multiple applications generating
audio all at the same time?
Specifically, is it possible to run one or more OSS applications, with
one or more Alsa applications, and jack enabled applications all at the same
time?
I think possibly not, but if not, is there some combination that does
work, like 1 Alsa + all the jack apps, etc?
Thanks very much,
Mark
29 Oct
29 Oct
1:03 p.m.
Mark Knecht wrote:
Hi,
Fundamental question - Does alsa support multiple applications generating
audio all at the same time?
Yes. But the code is not written. JACK is the only option for low
latency. There are plans to make artsd jackified but noone has started
on it ASFAIK.
Specifically, is it possible to run one or more OSS
applications, with
one or more Alsa applications, and jack enabled applications all at the same
time?
Not unless the oss apps can connect through jack which is possible but
the code has not been written
I think possibly not, but if not, is there some
combination that does
work, like 1 Alsa + all the jack apps, etc?
Thanks very much,
Mark
--
Patrick Shirkey - Boost Hardware Ltd.
For the discerning hardware connoisseur
Http://www.boosthardware.com
Http://www.djcj.org - The Linux Audio Users guide
========================================
"Um...symbol_get and symbol_put... They're
kindof like does anyone remember like get_symbol
and put_symbol I think we used to have..."
- Rusty Russell in his talk on the module subsystem
2:10 p.m.
On Wed, Oct 30, 2002 at 01:59:09AM +0900, Patrick Shirkey wrote:
Or your hardware supports multiple open, eg. the soundblaser live and
Maestro3 - though both these cards are pretty lousy in other ways.
- Steve
Specifically, is it possible to run one or more OSS applications, with
one or more Alsa applications, and jack enabled applications all at the
same
time?
Not unless the oss apps can connect through jack which is possible but
the code has not been written
2:36 p.m.
Steve,
My hardware is an RME Hammerfall Light. I don't know how to determine if
the hardware supports multiple open. Is this easy to figure out? Even if it
does, my understanding is that it doesn't have a mixer, so am I any further
forward? I'm not sure...
I think the 'best' solution is to get all the soft synths set up to use
jack, correct? If so, then I guess my job is to lobby the developers to make
this a priority. Whether they do it soon is yet to be seen.
But even having done that, I need to mix the outputs of all these synths
into a single stereo signal. As I understand jack it doesn't do this for me,
correct? (Actually, I sort of have a hard time sometimes understanding what
jack is doing, other than addressing the latency issue, which is important
unto itself.) This mixing could be done in Ardour, or possibly in Rosegarden
itself where I'm doing the MIDI work in the first place.
I still, as you can tell, do not have a very clear picture of how all the
audio is being routed between all these apps.
Thanks very much,
Mark
-----Original Message-----
From: linux-audio-user-admin(a)music.columbia.edu
[mailto:linux-audio-user-admin@music.columbia.edu]On Behalf Of Steve
Harris
Sent: Tuesday, October 29, 2002 10:07 AM
To: linux-audio-user(a)music.columbia.edu
Subject: Re: [linux-audio-user] All at the same time?
On Wed, Oct 30, 2002 at 01:59:09AM +0900, Patrick Shirkey wrote:
Or your hardware supports multiple open, eg. the soundblaser live and
Maestro3 - though both these cards are pretty lousy in other ways.
- Steve
Specifically, is it possible to run one or more OSS applications, with
one or more Alsa applications, and jack enabled applications all at the
same
time?
Not unless the oss apps can connect through jack which is possible but
the code has not been written 
7:21 p.m.
On Tue, Oct 29, 2002 at 10:28:25AM -0800, Mark Knecht wrote:
But even having done that, I need to mix the
outputs of all these synths
into a single stereo signal. As I understand jack it doesn't do this for me,
correct?
Incorrect. Jack will mix any number of sources attached to the same
port. So just attach all the synths to the same 2 jack ports.
(e.g. alsa_pcm:out_1 and alsa_pcm:out_2 ... soon to be renamed
alsa_pcm:playback_1, alsa_pcm:playback_2 or something like that)
--PW
--
Paul Winkler
http://www.slinkp.com
"Welcome to Muppet Labs, where the future is made - today!"
7:51 p.m.
Very cool Paul. I did not understand that.
Thanks!
-----Original Message-----
From: linux-audio-user-admin(a)music.columbia.edu
[mailto:linux-audio-user-admin@music.columbia.edu]On Behalf Of Paul
Winkler
Sent: Tuesday, October 29, 2002 3:18 PM
To: linux-audio-user(a)music.columbia.edu
Subject: Re: [linux-audio-user] All at the same time?
On Tue, Oct 29, 2002 at 10:28:25AM -0800, Mark Knecht wrote:
But even having done that, I need to mix the
outputs of all these
synths
into a single stereo signal. As I understand jack it
doesn't do this for
me,
correct?
Incorrect. Jack will mix any number of sources attached to the same
port. So just attach all the synths to the same 2 jack ports.
(e.g. alsa_pcm:out_1 and alsa_pcm:out_2 ... soon to be renamed
alsa_pcm:playback_1, alsa_pcm:playback_2 or something like that)
--PW
--
Paul Winkler
http://www.slinkp.com
"Welcome to Muppet Labs, where the future is made - today!"
8101
days inactive
8101
days old
linux-audio-user@lists.linuxaudio.org
5 comments
4 participants
participants (4)
-
Mark Knecht -
Patrick Shirkey -
Paul Winkler -
Steve Harris