[linux-audio-dev] Re: [Alsa-devel] Fwd: Re: USB Quattro Linux support

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Subject: [linux-audio-dev] Re: [Alsa-devel] Fwd: Re: USB Quattro Linux support
From: Patrick Shirkey (kotau_AT_firstlinux.net)
Date: Mon Apr 15 2002 - 15:16:17 EEST

--- Paul Davis <pbd_AT_op.net> wrote:
>>>framework for ALSA worked out, which is even more of a problem. Its
>>>still unclear at this point whether the ALSA framework will be:
>>>
>>> application<->alsa-lib<->alsa-driver<->low-level-ALSA-USB-class-driver
>>>
>>>OR
>>>
>>> application<->alsa-lib<->low-level-non-ALSA-USB-class-driver
>>>
>>>the first one is easier to write, the second one is more flexible.
>>>

I think a good example of how ALSA should work with USB devices is the gphoto approach. From what I know of their framework it is along the same lines as the first option.

>
>the problem i alluded to is just one of making an architectural
>decision. do you consider USB Audio devices to be best supported by a
>kernel driver with a USB focus, or an ALSA focus? alsa-lib can handle
>either, but in the former case (USB focus), more code has to be
>written in user space, and the existing USB audio driver for OSS has
>to be moved out of OSS and made more generic.
>

I'm pretty sure that we would have the means currently to see the device through the usb port. (I'll need to test that out) The problem I see is how does ALSA access the kernels USB modules and once that is sorted out we need the specs for the devices.

So how do we go about writing a "low-level-ALSA-USB-class-driver"? 

--
Patrick Shirkey - Boost Hardware Ltd
For the discerning hardware connoisseur
http://www.boosthardware.com
http://www.boosthardware.com/LAU/Linux_Audio_Users_Guide/

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