[FFADO-user] Device aggregation and FireWire controllers

[Stefan R. <st...@s5...>]

Hi,

today I did a quick test with a few different FireWire controllers and two
audio devices attached, to be aggregated by FFADO into a single audio
device from jackd's POV.  Here is the result:

Work:
	Agere FW643 rev 07
	Texas Instruments TSB43AB22(A)
	Texas Instruments TSB82AA2
	Texas Instruments XIO2213(A)

Do not work:
	JMicron JMB381
	NEC OrangeLink
	VIA VT6306

The failure mode of these latter controllers is that jackd's startup is
aborted with ffado logging that it could not align streams.  I retried
several times on each controller with consistent results.  The NEC and VIA
cards generally work for me with a /single/ audio device attached.  The
JMicron card not so much; at best it gives audio with glitches.

Sometimes startup of jack/ffado on the four working controllers may fail
too for other reasons; then the best approach seems to power-cycle the
audio devices and try again.  But once jackd runs, it works just as stable
for me as with only a single audio device.

Audio devices used in the test:
	Focusrite Saffire PRO 24
	Terratec Phase X24FW

Command line used in all tests:
	jackd -P66 -dfirewire -r96000 -p256 -n3 -v2

I also ran a few unsuccessful -r44100 attempts on the VIA card.

Software versions:
	linux 2.6.38.2
	libraw1394 2.0.7
	libffado 2.999.0-1958
	jackd 0.120.1

I don't think I am reporting something utterly surprising here but perhaps
this information is useful to some.
-- 
Stefan Richter
-=====-==-== -=-- ==--=
http://arcgraph.de/sr/