[PlanetCCRMA] jack - howto?
Kevin Bowen
kevin at ucsd.edu
Sun Apr 6 18:16:00 PDT 2003
Hello,
I'm new to audio on linux, just started installing bits and pieces of
planetCCRMA... first thing I'm trying to get working is jack-rack, but I
can't get it to actually output any sound. Alsa is set up and working (I can
play and record with aplay and arecord) but I'm not sure what I need to have
in my .asoundrc... I have a soundblaster live. Following the directions on
the alsa site, I put the following in my asoundrc:
pcm.emu10k1 {
type hw
card 0
}
ctl.emu10k1 {
type hw
card 0
}
Now I can start up jackd with 'jackd -d alsa -d emu10k1' and jack-rack will
launch and load a bunch of effects, but no sound ever comes out.
Following the alsa docs further, I see the part about the alsa 'jack
plugin'... it doesn't really explain what this is or if its necessary, but
says to get it working, you need to build alsa with configure --with-jack...
well I didn't build my own alsa, I used the Planet RPMS... I would assume
that they would have been built with the jack plugin if it was necessary,
right? Or am I being overly optimisitc? Assuming so, I went ahead and added
the following lines to my .asoundrc as instructed:
pcm.jackplug {
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
}
}
But this doesn't change anything. If I try to start up jackd with device
'jack' or 'jackplug' it fails with:
ALSA lib dlmisc.c:107:(snd_dlsym_verify) unable to verify version for symbol
_snd_pcm_jack_open
ALSA lib pcm.c:1783:(snd_pcm_open_conf) symbol _snd_pcm_jack_open is not
defined inside (null)
ALSA: Cannot open PCM device alsa_pcm/jack
cannot load driver module alsa
jack main caught signal 15
What am I missing?
Kevin Bowen
kevin at ucsd.edu
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