ALSA troubles.

[Nox Deleo]

It seems I've gotten really unlucky with my choice of sound card, and run
into a bug in ALSA.


Nox Deleo wrote:
> I've got a USB2 sound card which should be capable of full duplex in the
> configuration I've been using.
>
> I did some digging, and it seems to be related to hw parameters being set
> when the pcm's are opened. I get a kernel message: "Unable to change format
> on ep #81: already in use" whenever I try to open capture and playback
> pcm's at the same time.

This is a known bug in the driver; it works for this device in full duplex
only when both streams are opened before they are started.  So nothing but
Jack will work.


Regards,
Clemens


I'm trying to keep Jack out of the audio stack for my project (keeping
things as simple as I can for reliability). I'm not sure on the details of
how alsasrc/sink function in GStreamer, so I'm wondering if there's any way
I can get them to function as Clemens says?
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