jackaudio
No audio when replacing zita-a2j with internal zalsa client
Describe the bug
I'm trying to move from the zita-ajbridge over to the new internal client. I am using zita-a2j successfully in order to read from a alsa loopback device, but when replacing it with zalsa_in I'm unable to hear any audio.
Environment
-
JACK Version: Which version of jack2 are you using? (e.g. the output of
jackd --versionor a git commit checksum)$ jackd --version jackdmp version 1.9.18 tmpdir /dev/shm protocol 8 - Operating System: What operating system or distribution in which version are you using? (e.g. Linux, macOS, Windows) Gentoo Linux
- Installation: How did you install jack2? (e.g. package manager, from source) Package manager
Steps To Reproduce
I have a script like this to setup everything:
/usr/bin/jackd -R -ddummy -r48000 -p1024 &
jack_wait -w
jack_load zalsa_in -i "-j alsa -d hw:Loopback,1,0 -L"
jack_load zalsa_out -i "-j dock -d hw:Dock"
jack_connect zalsa_in:capture_1 zalsa_out:playback_1
jack_connect zalsa_in:capture_2 zalsa_out:playback_2
Expected vs. actual behavior
Actual behavior is there is no audio. (Jack aware application are working with zalsa_out)
Expected behavior is to hear audio on the device hooked to zalsa_out.
Here is the output:
jackdmp 1.9.18
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2021 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
`default' server already active
Failed to open server
server is available
zalsa_in is running.
client name = zalsa_in
zalsa_out is running.
client name = zalsa_out
Extra Info
This is the script I use currently with zita-ajbridge and it is working without issue.
/usr/bin/jackd -R -ddummy -r48000 -p1024 &
jack_wait -w
zita-a2j -j alsa -d hw:Loopback,1,0 -L &
zita-j2a -j dock -d hw:Dock &
zita-j2a -j laptop -d hw:Laptop &
sleep 2
jack_connect alsa:capture_1 laptop:playback_1
jack_connect alsa:capture_2 laptop:playback_2
One extra question, the -j option does not appear to be working either, is this expected?
One extra question, the
-joption does not appear to be working either, is this expected?
That is correct, use the jack_load client name option to set that. Example:
jack_load alsa zalsa_in -i "-d hw:Loopback,1,0 -L"
Also, something is wrong here:
jackdmp 1.9.18
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2021 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
`default' server already active
Failed to open server
That is correct, use the jack_load client name option to set that.
Awesome, thank you!
Also, something is wrong here
Ugh, sorry about that, I must have not cleaned up before running it, here is a rerun. Pretty sure most of the noise here is from jack_wait:
jackdmp 1.9.18
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2021 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
server is available
No jack_get_descriptor entry-point for zalsa_in
zalsa_in is running.
client name = zalsa_in
No jack_get_descriptor entry-point for zalsa_out
zalsa_out is running.
client name = zalsa_out
Running this again I discovered that if I'm already sending audio to the loopback when I start zalsa_in then it does work. However, if there is no audio going to the loopback when I load zalsa_in then there is no sound. I recall that I had a similar problem with zita-a2j, but it went away when I added the -L option.
worth checking if connections are being done properly. maybe everything is working fine, but jack_load returns before the client finishes activation?
I fixed the client names as you showed above, and I switched the jack_wait command to just be sleep. I also added a -v to the initialization string:
/usr/bin/jackd -R -ddummy -r48000 -p1024 &
sleep 5
jack_load alsa zalsa_in -i "-d hw:Loopback,1,0 -L -v"
jack_load dock zalsa_out -i "-d hw:Dock"
jack_connect alsa:capture_1 dock:playback_1
jack_connect alsa:capture_2 dock:playback_2
The connections appear to be made correctly:
$ jack_lsp -c
system:capture_1
system:capture_2
system:playback_1
system:playback_2
alsa:capture_1
dock:playback_1
alsa:capture_2
dock:playback_2
dock:playback_1
alsa:capture_1
dock:playback_2
alsa:capture_2
I may have spoken too soon about the -L option, I can't reproduce it working when starting with audio playing.
With the new -v option, I get the following output from jackd:
No jack_get_descriptor entry-point for zalsa_in
playback : not enabled
capture :
nchan : 2
fsamp : 48000
fsize : 128
nfrag : 2
format : S16_LE
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
Alsa_pcmi: error on capture pollfd.
...snip...
Here is the working output from zita-a2j
$ zita-a2j -j alsa -d hw:Loopback,1,0 -L -v
playback : not enabled
capture :
nchan : 2
fsamp : 48000
fsize : 256
nfrag : 2
format : S16_LE
Starting synchronisation.
0.011 0.999999 0
-0.131 1.000044 430
0.029 1.000013 431
0.069 0.999989 431
-0.002 0.999989 431
-0.047 1.000018 431
0.100 0.999979 431
0.032 0.999970 430
0.045 0.999984 430
0.044 0.999954 430
-0.041 0.999985 430
0.090 0.999926 429
0.005 0.999962 428
-0.160 1.000009 428
I changed my jack_load command to this, it looks like everything works now!:
jack_load alsa zalsa_in -i "-d hw:Loopback,1,0 -L -v -p 256"