I need to combine two HDSPe MADI FX cards to one virtual device. I have a
working driver, which is alsa-compatible. I can select each single card in
any alsa-compatible application and all channels work flawless.
For combining the MADI FX cards to one virtual device, I created an
.asoundrc with 194 inputs for each card. When I start that virtual device
jackd -R -d alsa -C madifx_record_all -P madifx_playback_all
I get this error:
> creating alsa driver ...
> jackd: pcm_multi.c:1060: snd_pcm_multi_open: Assertion
However, it works when I reduce the amount from 194 to 64 channels per
card. I tried to use 128 channels per card, but that fails the same way.
See my alsa-info attached, which also includes the .asoundrc content.
I also found this, which might be related:
To me, this looks like a bug. What do you think?
0.12% doesn't sound like much, but this consistently brings it up in 'top'.
If jackd doesn't have any connections, why does it wake up and do something?
It should be purely event driven, and the idle CPU use should be
disappearingly low. I think it does something redundant.
As a comparison, mpv player playing an audio mpeg stream consumes only