> > ALSA lib pcm_ladspa.c:1283:(snd_pcm_ladspa_parse_ioconfig) Unable to
> > find an audio port (1) for channel 1
> It means that the used LADSPA plugin has no second audio port.
When you say "no second audio port" is that different to processing a
stereo signal? Because it was my understanding that the LADSPA plugin
only processed one channel of sound, and ALSA duplicated this so that if
you had a stereo sound there would be two instances of the LADSPA plugin
running (I think this is what "policy duplicate" is for.)
You can see this problem by adding this to /etc/asound.conf:
pcm.test {
type ladspa;
slave.pcm "plughw:0,0"
path "/usr/local/lib/ladspa"
playback_plugins {
0 {
label delay_5s
policy duplicate
input {
controls [ 0.8 0.3 ]
}
}
}
}
If you then do something like "aplay stereo.wav -Dplug:test" you'll only
get one channel from stereo.wav out of both speakers.
Running "speaker-test -c2 -Dplug:test" only plays the "front right"
audio out of both front speakers.
Cheers,
Adam.
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