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 - 15:49:05 EEST
--- James Tappin <sjt_AT_star.sr.bham.ac.uk> wrote:
>On Monday 15 Apr 2002 13:16, Patrick Shirkey wrote:
>> --- 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.
>
>I think a more exact description of the gphoto approach is:
>application<->gphoto-lib<->usb-lib<->low-level-generic-USB driver.
>
>Only the low-level kernel USB drivers and the usbdevfs filesystem are in
>kernel space, beyond that the hardware driving is done via the user-space
>libusb. I'm not sure whether this would have low-enough latency for audio
>use, after all, digital cameras aren't timing-critical for the sort of things
>that gphoto aims to do.
>
>
I think that there is support in gphoto for capturing video streams but I haven't used it so I don't know if that is correct. Anyway if I am correct then latency issues would have been solved already.
I will query with someone from their list and report back unless someone else knows for certain.
-- Patrick Shirkey - Boost Hardware Ltd For the discerning hardware connoisseur http://www.boosthardware.com http://www.boosthardware.com/LAU/Linux_Audio_Users_Guide/>-- >+------------------------+-------------------------------+---------+ >| James Tappin | School of Physics & Astronomy | O__ | >| sjt_AT_star.sr.bham.ac.uk | University of Birmingham | -- \/` | >| Ph: 0121-414-6462. Fax: 0121-414-3722 | | >+--------------------------------------------------------+---------+ > >_______________________________________________ >Alsa-devel mailing list >Alsa-devel_AT_lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/alsa-devel
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