20 Feb
2016
20 Feb
'16
4:10 a.m.
The device driver for these cards is broken. At least arguably.
On Fri, Feb 19, 2016 at 9:46 PM, Markus Seeber <
markus.seeber(a)spectralbird.de> wrote:
On 02/19/2016 11:46 PM, Robin Gareus wrote:
[...]
That is correct, the AIO, same as the RayDAT has a fixed buffer of 16K.
This means that regardless of the requested number of periods and frame
size, it will always report a buffer size of 16K and a number of periods
equal to buffersize divided by framesize. Never the less, if requested 2
periods with framesize of 64 samples, the card will still work correctly
and have a latency that corresponds to 2 frames of 64 samples.
As said before, there are applications that make (most likely too many)
assumptions about these numbers and therefor break with these cards.
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> Usually I use 48KHz p256 n2:
> [rocketmouse@archlinux ~]$ jackd -dalsa -dhw:0 -r48000 -p256 -n2
> jackdmp 1.9.10
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2014 Grame.
> jackdmp 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
> no message buffer overruns
> no message buffer overruns
> JACK server starting in realtime mode with priority 10
> self-connect-mode is "Don't restrict self connect requests"
> audio_reservation_init
> Acquire audio card Audio0
> creating alsa driver ... hw:0|hw:0|256|2|48000|0|0|nomon|swmeter|-|32bit
> configuring for 48000Hz, period = 256 frames (5.3 ms), buffer = 2
periods
> ALSA: final selected sample format for
capture: 32bit integer
little-endian
> ALSA: use 64 periods for capture
> ALSA: final selected sample format for playback: 32bit integer
little-endian
ALSA: use
64 periods for playback
and 64.
I dimly recall seeing some message on LAU fly by about some RME devices
requiring 16K buffers.
If you have such a kernel/card, Ardour/ALSA won't currently support it
directly, sorry.