15 Jan
2018
15 Jan
'18
9:28 a.m.
On Mon, January 15, 2018 10:13 am, Benny Alexandar wrote:
I want both PC and USB sound card ports to be accessed
at the same time.
The design of jackd (really any sound server) requires it to be
synchronized to the sampling clock of the interface, and since your two
interfaces are not synchronized to each other then jackd cannot use both
at the same time without some intervention.
Using two at the same time requires choosing one card to the be the main
backend device, then loading a sample rate converter to make the sample
stream rate to and from the secondary card(s) match exactly that of the
main card.
The packages you want are zita-alsa2jack and zita-jack2alsa, in Fedora
both come together in a package named zita-ajbridge.
This is covered in the jack FAQ, which needs to be updated, the section
describing alsa_in and alsa_out bridges is the relevant section, but those
older implementations had some problems, the zita bridges are higher
quality replacements.
http://jackaudio.org/faq/multiple_devices.html
The zita tools are included in the audio aware distributions, if you are
using a distribution which does not package them for some reason you can
get them along with the other zita applications here:
https://kokkinizita.linuxaudio.org/linuxaudio/
The jackd v1 implementation includes the equivalent of the zita bridges
internally, they need to be enabled from the command line but not loaded
as an external component. The jackd v2 implementation (I think you said
you were using jackd 1.9.12, that is considered jackd v2) does not yet
include the zita bridges as part of the server, you will need to load them
externally.
--
Chris Caudle
16 Jan
16 Jan
9:36 a.m.
New subject: [Jack-Devel] Using USB sound card with Jack
Hi,
I want to test how zita-ajbridge behaves when there is a drift in clock.
Any idea how to artificially create clock drift for testing purpose.
Any test code available in Jack audio.
-ben
________________________________
From: Jack-Devel <jack-devel-bounces(a)lists.jackaudio.org> on behalf of Chris Caudle
<chris(a)chriscaudle.org>
Sent: Monday, January 15, 2018 9:58 PM
To: jack-devel(a)lists.jackaudio.org
Subject: Re: [Jack-Devel] Using USB sound card with Jack
On Mon, January 15, 2018 10:13 am, Benny Alexandar wrote:
I want both PC and USB sound card ports to be accessed
at the same time.
The design of jackd (really any sound server) requires it to be
synchronized to the sampling clock of the interface, and since your two
interfaces are not synchronized to each other then jackd cannot use both
at the same time without some intervention.
Using two at the same time requires choosing one card to the be the main
backend device, then loading a sample rate converter to make the sample
stream rate to and from the secondary card(s) match exactly that of the
main card.
The packages you want are zita-alsa2jack and zita-jack2alsa, in Fedora
both come together in a package named zita-ajbridge.
This is covered in the jack FAQ, which needs to be updated, the section
describing alsa_in and alsa_out bridges is the relevant section, but those
older implementations had some problems, the zita bridges are higher
quality replacements.
http://jackaudio.org/faq/multiple_devices.html
The zita tools are included in the audio aware distributions, if you are
using a distribution which does not package them for some reason you can
get them along with the other zita applications here:
https://kokkinizita.linuxaudio.org/linuxaudio/
The jackd v1 implementation includes the equivalent of the zita bridges
internally, they need to be enabled from the command line but not loaded
as an external component. The jackd v2 implementation (I think you said
you were using jackd 1.9.12, that is considered jackd v2) does not yet
include the zita bridges as part of the server, you will need to load them
externally.
--
Chris Caudle
_______________________________________________
Jack-Devel mailing list
Jack-Devel(a)lists.jackaudio.org
http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
2:44 p.m.
New subject: [Jack-Devel] Using USB sound card with Jack
On Tue, Jan 16, 2018 at 04:36:54PM +0000, Benny Alexandar wrote:
Hi,
I want to test how zita-ajbridge behaves when there is a drift in clock.
Any idea how to artificially create clock drift for testing purpose.
Just try it with two unsynchronised sound cards. There will be drift
between the two clocks. It may even be possible to try it with the two
cards set to different rates (I haven't tried it).
You can disable the resampling in zita-ajbridge with the -S option to
compare behaviour without it.
John
2:53 p.m.
New subject: [Jack-Devel] Using USB sound card with Jack
On Tue, Jan 16, 2018 at 04:36:54PM +0000, Benny Alexandar wrote:
I want to test how zita-ajbridge behaves when there is
a drift in clock.
It will just track the drift and compensate for it.
Any idea how to artificially create clock drift for
testing purpose.
You don't need to, no two sound cards will have exactly the
same sample rate if they are not synced.
The simple way to test ajbridge is to measure the delay
of a loop through both soundcards, using e.g. jack_delay.
There are some test results in the LAC paper as well.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
23 Jan
23 Jan
9:12 a.m.
New subject: [Jack-Devel] Using USB sound card with Jack
> The simple way to test ajbridge is to measure the
delay
of a loop through both soundcards, using e.g. jack_delay.
How to measure the delay between two sound cards ?
What does the jack_delay measures, the delay between
what and what ?
Any documentation on how to use the jack_delay for measuring ?
-ben
________________________________
From: Jack-Devel <jack-devel-bounces(a)lists.jackaudio.org> on behalf of Fons
Adriaensen <fons(a)linuxaudio.org>
Sent: Wednesday, January 17, 2018 3:23 AM
To: jack-devel(a)lists.jackaudio.org
Subject: Re: [Jack-Devel] Using USB sound card with Jack
On Tue, Jan 16, 2018 at 04:36:54PM +0000, Benny Alexandar wrote:
I want to test how zita-ajbridge behaves when there is
a drift in clock.
It will just track the drift and compensate for it.
Any idea how to artificially create clock drift for
testing purpose.
You don't need to, no two sound cards will have exactly the
same sample rate if they are not synced.
The simple way to test ajbridge is to measure the delay
of a loop through both soundcards, using e.g. jack_delay.
There are some test results in the LAC paper as well.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
_______________________________________________
Jack-Devel mailing list
Jack-Devel(a)lists.jackaudio.org
http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
12:41 p.m.
New subject: [Jack-Devel] Using USB sound card with Jack
On Tue, Jan 23, 2018 at 04:12:16PM +0000, Benny Alexandar wrote:
1. Read available documentation.
2. Think.
3. If after (1) and (2) some things remain unclear proceed to (4).
4. Ask questions on mailing lists.
You have a habit of skipping the first three. That is getting
on my nerves, and not only on mine.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
> The simple way to test ajbridge is to measure
the delay
of a loop through both soundcards, using e.g. jack_delay.
How to measure the delay between two sound cards ?
What does the jack_delay measures, the delay between
what and what ? 
24 Jan
24 Jan
4:56 a.m.
New subject: [Jack-Devel] Using USB sound card with Jack
Fons Adriaensen <fons(a)linuxaudio.org> writes:
On Tue, Jan 23, 2018 at 04:12:16PM +0000, Benny
Alexandar wrote:
1. Read available documentation.
2. Think.
3. If after (1) and (2) some things remain unclear proceed to (4).
4. Ask questions on mailing lists.
You have a habit of skipping the first three. That is getting
on my nerves, and not only on mine.
Well, to be fair it is hard to interpret the results of just trying, and
"available documentation" could be better in many cases. It's pretty
exhaustive in the case of jack_delay's man page I'll admit (though the
need to differentiate between JACK1 and JACK2 and various behaviors is
really good for a head ache, requiring more of 2. than users might have
readily available, probably hard for an insider to the program to
fathom).
On the LilyPond (batch music typesetter with plain text input language)
user list I often get puzzled at requests of the "can I do this" kind of
questions where one wants to shout "why don't you ask LilyPond?". Some
people seem more comfortable risking annoying another human rather than
annoying a program.
At least with regard to latencies it is rather tricky to "just try".
--
David Kastrup
> The simple way to test ajbridge is to measure
the delay
of a loop through both soundcards, using e.g. jack_delay.
How to measure the delay between two sound cards ?
What does the jack_delay measures, the delay between
what and what ?
28 Jan
28 Jan
8:34 a.m.
New subject: [Jack-Devel] Using USB sound card with Jack
Hi,
I downloaded ajbridge (zita-ajbridge-0.7.0.tar.bz2 )
<https://kokkinizita.linuxaudio.org/linuxaudio/downloads/zita-ajbridge-0.7.0.tar.bz2>
, resampler version 1.6 and alsa-pcmi version 0.2.0
and built all successfully.
However while running zita-a2j I got the following error.
$zita-a2j: error while loading shared libraries: libzita-resampler.so.1: cannot open
shared object file: No such file or directory
When checked the installation message, it says it installed under /usr/local/lib64
install -d /usr/local/include/zita-resampler
install -d /usr/local/lib64
install -m 644 zita-resampler/resampler.h zita-resampler/resampler-table.h
zita-resampler/vresampler.h zita-resampler/cresampler.h /usr/local/include/zita-resampler
install -m 644 libzita-resampler.so.1.6.0 /usr/local/lib64
ln -sf libzita-resampler.so.1.6.0 /usr/local/lib64/libzita-resampler.so
ldconfig
So, I modified the /etc/ld.so.conf file and added the path for lib64
/usr/local/lib
/usr/local/lib64
Then, things started to work.
Now, I connected USB sound card and it shows the sound card as follows,
cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf7d30000 irq 35
1 [HD ]: USB-Audio - USB Sound Blaster HD
Creative Technology USB Sound Blaster HD at usb-0000:00:14.0-2, full
speed
After starting jack server using qjackctl, opened terminal and
ran the following cmd
$zita-a2j -d hw:HD -p 1056 -v
Then in qjackctl connected the graph as shown in the attached picture.
USB sound card input (line-in) is connected to an audio output from other PC.
But I can't hear the audio using zita-j2a.
I mean audio was not heard in PC where zita-j2a is running.
Anything wrong in the connections, how to debug and check why
no audio is heard.
-ben
________________________________
From: Jack-Devel <jack-devel-bounces(a)lists.jackaudio.org> on behalf of David Kastrup
<dak(a)gnu.org>
Sent: Wednesday, January 24, 2018 5:26 PM
To: jack-devel(a)lists.jackaudio.org
Subject: Re: [Jack-Devel] Using USB sound card with Jack
Fons Adriaensen <fons(a)linuxaudio.org> writes:
On Tue, Jan 23, 2018 at 04:12:16PM +0000, Benny
Alexandar wrote:
1. Read available documentation.
2. Think.
3. If after (1) and (2) some things remain unclear proceed to (4).
4. Ask questions on mailing lists.
You have a habit of skipping the first three. That is getting
on my nerves, and not only on mine.
Well, to be fair it is hard to interpret the results of just trying, and
"available documentation" could be better in many cases. It's pretty
exhaustive in the case of jack_delay's man page I'll admit (though the
need to differentiate between JACK1 and JACK2 and various behaviors is
really good for a head ache, requiring more of 2. than users might have
readily available, probably hard for an insider to the program to
fathom).
On the LilyPond (batch music typesetter with plain text input language)
user list I often get puzzled at requests of the "can I do this" kind of
questions where one wants to shout "why don't you ask LilyPond?". Some
people seem more comfortable risking annoying another human rather than
annoying a program.
At least with regard to latencies it is rather tricky to "just try".
--
David Kastrup
_______________________________________________
Jack-Devel mailing list
Jack-Devel(a)lists.jackaudio.org
http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
> The simple way to test ajbridge is to measure
the delay
of a loop through both soundcards, using e.g. jack_delay.
How to measure the delay between two sound cards ?
What does the jack_delay measures, the delay between
what and what ? 
29 Jan
29 Jan
3:23 a.m.
New subject: [Jack-Devel] Using USB sound card with Jack
On Sun, Jan 28, 2018 at 03:34:08PM +0000, Benny Alexandar wrote:
Now, I connected USB sound card and it shows the sound
card as follows,
cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf7d30000 irq 35
1 [HD ]: USB-Audio - USB Sound Blaster HD
Creative Technology USB Sound Blaster HD at usb-0000:00:14.0-2,
full speed
After starting jack server using qjackctl, opened terminal and
ran the following cmd
$zita-a2j -d hw:HD -p 1056 -v
Then in qjackctl connected the graph as shown in the attached picture.
USB sound card input (line-in) is connected to an audio output from other PC.
But I can't hear the audio using zita-j2a.
I mean audio was not heard in PC where zita-j2a is running.
Anything wrong in the connections, how to debug and check why
no audio is heard.
Starting jackd from the command line is preferable to qjackctl for debugging.
Use jack_connect to make connections.
Use jack_disconnect to break connections.
Use jack_lsp to show existing jack connections.
Read man pages:
man jackd
man jack_connect
man jack_disconnect
man jack_lsp
John
2278
days inactive
2292
days old
jackaudio@lists.linuxaudio.org
8 comments
5 participants
participants (5)
-
Benny Alexandar -
Chris Caudle -
David Kastrup -
Fons Adriaensen -
John Rigg