Re: [FFADO-user] Jack/FFADO high samplerates

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

On Apr 20 Clemens Ladisch wrote:
> Rolf Anderegg wrote:
> > However in the long run it would be better to know what is hindering
> > FFADO to build up a regular 192kHz stream to the DICE. Are you saying
> > that higher rate streams work fine with other non-DICE devices?
> 
> From what I've heard, yes.
> 
> With the snd-dice driver, my Desktop Konnekt 6 runs playback at all
> frequencies, although with somewhat mixed-up channels at 192 kHz.
> (I expect to have capturing running by next week.)  FFADO works with
> rates up to 96 kHz; at 192 kHz, it aborts immediately with an assertion
> failure because the packet headers of the capture stream contain
> unexpected values.  The latter implies that your FFADO problem is caused
> by something else.

I have no idea whether it contributes anything to the subject, but here is
what I see with a non-DICE device; a Terratec Phase X24FW which is based on
DM1100 according to my notes.

$ jackd -P66 -dfirewire -r192000 -p1024 -n3 -v3
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

no message buffer overruns
JACK compiled with System V SHM support.
loading driver ..
484149638914:  (ffado.cpp)[  92] ffado_streaming_init: libffado 2.999.0-1958 built Feb 26 2011 16:08:18
484149811612: Warning (ieee1394service.cpp)[ 375] initialize: Could not set SPLIT_TIMEOUT to min requested (1000000)                                                                                        
484149811648: Warning (ieee1394service.cpp)[ 379] initialize: Set SPLIT_TIMEOUT to min requested (1000000) did not succeed                                                                                  
484149826088: Warning (cycletimer.h)[ 120] wrapAtMinTicks: insufficient wrapping: -4097677260898540168
484152653051: Warning (StreamProcessor.cpp)[ 707] getPacket: Instantanous samplerate more than 1% off nominal. [Nom fs: 192000.000000, Instantanous fs: 96000.000000, diff: 96000.000000 (    0.500000)]    

I.e. ffado's BeBoB driver seemingly succeeds to configure a 192k stream but
actually gets a 96k stream.  The Phase X24FW remains silent when a jackd
client plays back.
-- 
Stefan Richter
-=====-==-== -=-- =-==-
http://arcgraph.de/sr/