[maemo-developers] [maemo-developers] libxv status?

[From: Daniel Stone]

On Wed, Jul 26, 2006 at 09:07:57AM +0300, ext Siarhei Siamashka wrote:
> On Tuesday 25 July 2006 09:01, you wrote:
> > > http://www.internettablettalk.com/forums/showthread.php?t=2405
> > >
> > > Actually mplayer works surprisingly fast and has performance not much
> > > inferior to default video player on Nokia 770 that is using DSP. And
> > > that all is even without hardware colorspace conversion support!
> > >
> > > So is it possible to have an accelerated version of libxv on Nokia 770
> > > that would support colorspace conversion and scaling (no matter whether
> > > using video controller capabilities or relay this task to DSP)? So that
> > > a more universal and well supported ARM core could deal only with video
> > > stream decoding.
> >
> > We don't have any plans to do this for the 770.
> 
> Thanks for your reply.
> 
> In order not to take much of your time, just a few more questions which
> require only yes/no/maybe answers :)
> 
> Does Nokia 770 hardware really support YUV colorspace?

My understanding is that the only support we have right now is through
the DSP.

> Is it technically possible (I'm not asking whether it is planned by Nokia now)
> to have some simple API for YUV colorspaces support added probably as part of
> libxsp?

Having some sort of wrapper around the DSP access would be desirable,
yes.  It's theoretically possible to do with Xv as well, if someone's
sufficiently motivated: there's no necessary tie between Xv and actually
using the GPU.

> Is Nokia interested in getting any assistance from the community (from me
> for example) in improving performance and capabilities of the software
> and libraries preinstalled on the device?

I can't speak for the company as a whole, but I'd hazard a guess at the
answer to that one generally being yes. :)

> I'm interested in good video support and also game development (official
> support for twice lower resolution in SDL using pixel doubling, support for
> portrait/landscape screen orientation modes, background music playback
> utilizing DSP core, virtual keyboard for X11 applications and SDL in
> particular, etc.). So I don't mind contributing some of my free time to do
> some work in order to get all this real.

To be honest, I haven't played with the SDL stuff at all, and it's not
really in my area, so I'd have to defer to someone else here.

Cheers,
Daniel
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