Hi,
I'm a developer for ALSA firewire stack.
On Tue, Jun 16, 2020 at 10:11:57AM +0200, m.eik michalke wrote:
i'm trying to get a presonus StudioLive 24.4.2 up and running:
https://www.presonus.com/products/studiolive-24.4.2
so far i'm partly successful -- looks like the board is automatically detected and supported by the firewire dice module.
Thanks for your trial to the device. For my information, would you show your kernel version?
however, i'm only offered 16 of the 24 supported audio channels. in the list of soundcards it is merely shown as "studiolive" without further info on the model. i wasn't able to find further info on this board's status with regards to alsa, so if there's documentation on this somewhere, could someone please point me to it?
I guess that Dice ASIC in your device can process two pairs of isochronous packet streams. In the case, the driver adds two PCM devices to system. I think you saw the first PCM device and it can handle 16 PCM channels. Another can handle the rest 8 channels.
Would you find below procfs nodes and dump their contents?
* /proc/asound/cardX/firewire/dice * /proc/asound/cardX/firewire/formation
Here, the 'X' should be replaced with the one in your system.
in case that as of now the studiolive isn't officially supported or the above behavior is due to the fact that so far only the 16.4.2 is known to the module, i'm willing to help as far as i can ;) i hope that already seeing 16 channels is a good point to start and that it's not too hard to make the remaining 8 show up as well...
Would you get output from '/proc/asound/pcm'?
For example, in the case of M-Audio Profire 610:
$ cat /proc/asound/pcm ... 02-00: DICE : FW610 : playback 1 : capture 1 02-01: DICE : FW610 : playback 1
We can see two PCM devices in the above for playback PCM substream.
Thanks
Takashi Sakamoto