[haiku-development] Re: MediaKit encoding support GSoG
- From: "Michael Lotz" <mmlr@xxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Mon, 15 Mar 2010 22:35:22 +0000
> François Revol wrote:
> > VirtualBox seems to present both an OHCI and EHCI though, and is
> > able
> > to provide raw usb access on host devices, so it should be usable
> > to
> > test an builtin iSight or an external UVC cam.
> >
> External should work, builtin iSight might be USB2 and therefore
> automagically be coupled to EHCI....
>
> Anyway, there are ways to develop the UVC part without having to have
> UHCI/EHCI iso. support, though ofcourse, for end-users UHCI/EHCI iso
> support would be great!
Nope, actually UHCI isochronous support is implemented, although it
isn't really tested and therefore may or may not work. OHCI and EHCI
isochronous support is missing. Note as well that for EHCI there are
actually two types of isochronous transfers due to split transactions
for transaction translators (i.e. fullspeed devices behind hubs) which
makes things especially complicated. I'm still planning on implementing
these eventually, though it's hard to come up with the motivation to do
so seeing that there aren't any users for that functionality right now.
Regards
Michael
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