Jack (plugin)
From the ALSA wiki
Jump to: navigation, search
In short, you can set up your asoundrc file to specify JACK as the output, like so:
pcm.!default {
type plug
slave { pcm "jack" }
}
pcm.jack {
type jack
playback_ports {
0 alsa_pcm:playback_1
1 alsa_pcm:playback_2
}
capture_ports {
0 alsa_pcm:capture_1
1 alsa_pcm:capture_2
}
}
ctl.mixer0 {
type hw
card 0
}
Then, after starting jackd with the appropriate sample rate for what you're doing, you can use ALSA apps with JACK:
jackd -d alsa -d hw:0 -r 44100
aplay -D pcm.jack <filename>
This will direct the ALSA playback stream (from aplay) visible to your JACK application, rather than sending it directly to the sound card.
\
Non-ALSA JACK audio I/O (e.g. FreeBOB)
If jackd is using an audio driver other than ALSA (as in FreeBOB, for
example), the port names in the pcm.jack definition will be different
from the example above. With jackd running, run jack_lsp to find out
the port names, for example:
$ jack_lsp
system:capture_1
system:capture_2
system:capture_3
system:capture_4
system:capture_5
system:capture_6
system:playback_1
system:playback_2
system:playback_3
system:playback_4
system:playback_5
system:playback_6
system:playback_7
system:playback_8
You can then use the appropriate port names in your .asoundrc, e.g.
pcm.jack {
type jack
playback_ports {
0 system:playback_1
1 system:playback_2
}
capture_ports {
0 system:capture_1
1 system:capture_2
}
}
Retrieved from "http://alsa.opensrc.org/Jack_(plugin)"