[linux-audio-dev] plug:jack device channel-count

Lee Revell rlrevell at joe-job.com
Fri Aug 25 00:38:55 UTC 2006

On Fri, 2006-08-25 at 00:30 +0000, carmen wrote:
> > Yes, but what would be even more useful is to report this to the
> > sweep developers.
> done.
> as it turns out, theres a divide-by-zero on alsahandle->num_channels
> or similar. ive noticed other ALSA apps will also fail with plug:jack
> (notably Twinkle) with an error very similar (eg, no available
> channels for opening), while others such as Ekiga or those using
> GStreamer, have no problems with plug:jack.
> are these apps working around it by trying to open channels even if
> the number available is reported to be 0? maybe this is a bug in
> jack:plug for not making up a number like at least 2, if alsa_pcm
> devices exist in jack..

I don't know - you failed to mention that you were using plug:jack.
Probably no one ever tested this configuration.

(I don't think plug:jack is well tested in general.  The JACK API is
simpler than ALSA so it's easier for apps to just support JACK.)

You did mention that in your bug report I hope?

Does Sweep really have no JACK support?


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