[alsa-devel] Userspace Device Driver
klaus_zimmermann at gmx.de
Thu May 31 00:03:02 CEST 2007
on various places on the alsa site I read about the possibility of
writing a userspace device driver.
I am interested thatin, since I have a nice Edirol FA-66 ieee1394
interface which works nicely under jack with the ffado
(http://ffado.org , former freebob) driver.
>From what I read it seems I could either write an external plugin to the
alsa-lib, which would be truly userspace and fine except I it would
always have to be configured from .asoundrc and would probably not be
found by legacy programs like ekiga.
Or I could get really messy and have a userspace daemon relay audio data
between the ffado library, i.e. librawieee1394, and a yet to be written
This would at least yield the advantage, that the driver was
indistinguishable from a true hardware driver.
So: Is it possible to write a userspace driver that is indistinguishable
from a hardware driver?
P.S.: I am aware of the jackplug plugin. However even with very
conservative buffer settings I get underruns and x-runs quickly leading
to a failing jack :(
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