Re: [Xbox-linux] Adjusting the video frame position

[David P. <dm...@da...>]

Hi Bjorn,

This is something I have an interest in as well - the correct way to
adjust it on Focus as far as I can see if to position the NVHSYNCSTART and
NVVSYNCSTART properly - however, I cannot fathom the algorithm Conexant
uses to do this - it seems beyond me to work out what it is doing!
So, I hacked something up by pure experimentation to position it as a
fraction of NVTOTAL - however, as you can see this isnt quite right in
many circumstances, and on many TVs...
If you can work out what conexant_calc_blankings() does, and make it
useful for FOCUS (we need only the sync positioning stuff) I believe this
should almost complete the necessary driver work for focus :)
David


> Is there a recommended "best way" to adjust the position of the
> top-left corner of the frame buffer on the TV screen?
>
> I am currently using a kernel patch (Focus-only) that sets the
> position to a fixed value that is adjusted for my TV. Each time
> my software switches to 720x576 for optimal PVR or DVD playback,
> a patch to focus_calc_mode() makes sure the frame gets repositioned
> where I want it. After some slight adjustment of contrast and color
> saturation, I get a picture that is better than my hardware DVD
> player, indistinguishable from live broadcast, and since the software
> is Linux-based it doesn't crash or hang quite as much as standalone
> Xbox software such as XBMC does. So I'm quite happy for my own sake now
> with my little setup...
>
> But in order to make my software useful to other people, I need
> to use a more "mainstream" approach for this screen positioning,
> so I'd appreciate to hear people's thoughts and advice on this.
>
> --
> Bjorn Danielsson  <sf...@da...>
>
>
>
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