9 Mar
2003
9 Mar
'03
8:23 p.m.
Hi all,
I would like to route audio streams coming from different (software) sources to the
outputs of my different sound cards (1 card multichannel and 2 cards 2-channel). The
outputs are connected to different rooms in my house.
For the moment, I'm using Alsa with different 'routing-profiles' in my
.asoundrc settings, for instance one profile that will address all my different channels
of my multichannel card (this would cover the living room, kitchen, bathroom and study,
but not the bedroom). I can use this profile with aplay to play a soundfile in all these
rooms.
However I would now like to switch to different rooms _while_ playing a soundfile with
aplay. I am dreaming of some sort of interface that has different audio sources on one end
(mp3, television, radio, ...) and outputs on the other side (kitchen, living room,
bathroom, ...). Using this interface, one would be able to switch any source to any
output. Preferable, also with different volume-settings per channel, per source.
I allready looked at Jack and aRtsd, but I can't seem to figure out if they are the
holy grail.
Has anyone encountered such routing issues ? Is there any program out there that already
does more or less what I described ? Any thoughts or comments are greatly appreciated !
Ciaos,
Kristof
9 Mar
9 Mar
10:43 p.m.
Kristof Pelckmans wrote:
Has anyone encountered such routing issues ? Is there
any program out there that already does more or less what I described ? Any thoughts or
comments are greatly appreciated !
To the best of my knowledge I cannot recall anything specifically
designed for this purpose.
I assume that when you talk about using the .asoundrc you are using the
pcm copy function.
If you have all your outputs connected to the multi channel card then
JACK will allow you to route to multiple outputs. You would have to find
a way to name them bedroom, kitchen... though.
Using multiple cards as one is not gauranteed to work very well unless
their wordclocks can be linked together. If this is not done the samples
will start to get out of sync and in my experience become unlistenable.
I wonder if it is now possible to make aRTsd use the pcm_jack plugin?
That would allow you to use all sound apps through aRTsd and JACK at one
time.
--
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://www.djcj.org - The Linux Audio Users guide
========================================
Being on stage with the band in front of crowds shouting, "Get off! No!
We want normal music!", I think that was more like acting than anything
I've ever done.
Goldie, 8 Nov, 2002
The Scotsman
10 Mar
10 Mar
3:54 a.m.
Quoting Patrick Shirkey <pshirkey(a)boosthardware.com>om>:
I assume that when you talk about using the .asoundrc
you are using the
pcm copy function.
For the moment I'm only using my multichannel card, so there
was no need yet to copy streams.
An excerpt of the .asoundrc file :
pcm.d410ch12 {
type plug
ttable.0.0 1
ttable.0.1 1
slave.pcm ice1712
}
plays on the first two channels (living room), while
pcm.d410ch1234 {
type plug
ttable.0.0 1
ttable.0.1 1
ttable.0.2 1
ttable.0.3 1
slave.pcm ice1712
}
would play on 4 channels. (living room + bathroom).
Using multiple cards as one is not gauranteed to work
very well unless
their wordclocks can be linked together. If this is not done the samples
will start to get out of sync and in my experience become unlistenable.
Is this
also true when you are not mixing different sound cards in one room ? For instance playing
an mp3 on two channels of my multichannel card (first room) and on two channels of another
card (second room). When trying to do Dolby 7.1 in my living room, only a multichannel
card can prevent clock problems.
I wonder if it is now possible to make aRTsd use the
pcm_jack plugin?
That would allow you to use all sound apps through aRTsd and JACK at one
time.
As I understand, using all these frameworks introduces a third layer :
- player (connects to jack, artsd, ...)
- connector (eg jack that connects to the real device)
- driver (for instance alsa)
Is there a way to influence the behavior of the second layer (I would name it the
connector) while playing a sound ? This is what I need in order to perform 'live'
routing.
Initially I was thinking of avoiding jack and just creating some 'virtual oss
devices', one for each source. For instance /dev/mp3_out, /dev/tv_out, /dev/radio_out.
Then I would have to write some software that connects the different incoming streams of
these devices to the real devices. However, I'm afraid that this would mean a lot of
overhead (copying raw streams) and latency problems. The great advantage would be that any
application that knows how to talk to oss can be integrated.
Just my thoughts...
-K-
5:50 a.m.
On Mon, Mar 10, 2003 at 08:46:12 +0100, Kristof Pelckmans wrote:
Yes, you can rewire jack connections on the fly using jackconnect
(commandline), or qjackconnect (QT). There are probably other things that
can do it as well.
There is an ALSA-JACK plugin that can route the output of any ALSA program
to JACK, but I expect you can everything you need with native jack apps.
- Steve
I wonder if it
is now possible to make aRTsd use the pcm_jack plugin?
That would allow you to use all sound apps through aRTsd and JACK at one
time.
As I understand, using all these frameworks introduces a third layer :
- player (connects to jack, artsd, ...)
- connector (eg jack that connects to the real device)
- driver (for instance alsa)
Is there a way to influence the behavior of the second layer (I would name it the
connector) while playing a sound ? This is what I need in order to perform 'live'
routing. 
9 Mar
9 Mar
11:49 p.m.
Has anyone encountered such routing issues ? Is
there any program out there that already does more
or less what I described ? Any thoughts or comments
are greatly appreciated !
Kristof -
On room at the studio I administrate has three
machines (three OS's, actually...IRIX, Linux,
Windoze), as well as external hardware, some of which
wired out of the room for quiet recording, etc.
Every signal to and from the various harware is
controllable and independently routable 'per channel'
with a software mixer called TotalMix which runs on my
"DSP host" machine with a Hammerfall HDSP card
(running windows for now, I'm afraid). Any input can
be routed to any output, or any input can be routed to
all outputs simultaneously, etc.
There was talk on this list of a TotalMix port to
Linux, but I have not seen anything just yet. Here's
hoping!
Kevin
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4 comments
4 participants
participants (4)
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kevin ernste -
Kristof Pelckmans -
Patrick Shirkey -
Steve Harris