[vdr] Re: Games & etc on DVB

[Matthias Mueller <matthias.mueller@rz.uni-karlsruhe.de>]

Hi,

On Thu, Sep 19, 2002 at 06:15:54PM +0200, Martin Hoffmann wrote:
> > It would be too slow. Why not write driectly into the framebuffer of the
> > dvb-card??
> Of course yes - but afaik the current driver (or maybe the hardware itself) 
> does not allow to directly acces the buffer of the card !
According to a mail to the dvb-mailinglist, it's not possible:

> Peter Seyringer writes:
> > Is it posible with the new firmware to write direct in the framebuffer
> > memory of the mpeg encoder. This would be a great future to implement
> > some programs without any complicat algols (like converting them into 
> > MPEG1 oder MPEG2). That makes it also posible to implement a WEB browser
> > oder same games on the dvb-s card :).

> No, sorry, nothing regarding this was improved in the new firmware.
>
>You are talking about 720x576x2x25 or about 20 MByte/s which 
>you would need for transfering complete pictures in real-time.
>I don't know how high we could really get. Right now we are happy
>about 20 MBit/s.
>It would also create over 5000 Interrupt/s on the PC side even 
>if you use the full 8K dual ported RAM with buffer switching 
>for transfers. 
>
>Ralp

Even if you could use 352x288, that would still need ~40MBit/s. I don't
think this will be possible...

Ciao,
Matthias
-- 
Matthias.Mueller@rz.uni-karlsruhe.de
Rechenzentrum Universitaet Karlsruhe
Abteilung Netze