[LAU] No more PCI!

[Arnold Krille]

Hi,

On Saturday 23 January 2010 23:05:16 Pieter Palmers wrote:
> PS: An ALSA driver for firewire devices will solve quite some issues
> with respect to user experience and compatibility. Nevertheless I'm
> personally still inclined to maintain and improve the userspace jack
> streaming engine, and also port it to the new firewire stack. I'm not
> convinced that things like hot-plugging, device aggregation and
> sample-accurate midi will be easy to implement using
> jack->ALSA->firewire. So maybe you should worry more about the confusion
> that might cause...

I once started thinking about this:

 - Does alsa support devices where channels are added and removed during 
runtime? If yes, firewire would be one big device and the channels are added 
when the stream is established (and the sync is stable). If not, things will 
get nasty...

 - Users are already confused when they have to start special mixer apps to 
get their detected card running, doing the detection in some userspace to get 
the device is probably more confusing for the entry-level. But that detection 
app can probably be run by udev like the firmware loaders for some usb-devices. 
But if alsa doesn't support adding channels at runtime, a complex configuration 
app is needed...

 - Why can't each firewire-device be one alsa-device? fw allows very easy 
syncing of multiple cards (two ways for sync are already in the firewire 
protocol), so this is widely used. When each device has its own alsa-device, 
apps would need to open several devices and still get all their callbacks 
combined at once (or as one callback). I don't know about the alsa internals, 
but I think its easier to open one device instead of opening several and keep 
track of the sync.

Have fun,

Arnold
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