On Mon, 2 Jan 2006, Adam Nielsen wrote:
> > > 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.)
Ok, it means that the LADSPA plugin has no second audio port in this
contents. If you use a plugin with one input and one output, you cannot
try to assign more inputs. And the duplicate policy works only for "mono"
LADSPA plugins. For other plugins, you have to use the "none" policy.
> Running "speaker-test -c2 -Dplug:test" only plays the "front right"
> audio out of both front speakers.
Confirmed. It seems that the problem has nothing with the ALSA LADSPA
plugin code but with the latest mmap code optimizations. I'm still
figuring where the real bug is.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs
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