[linux-dvb] Some thoughts about Framebuffer

[Harald Lipphaus <Harald@lipphaus.com>]

hi,
it seems for me, that we reached a point in the developement of the 
driver and the applications, where we have to talk about another way of 
displaying the OSD for the following reasons:

1: we can not expect a enhancement of the current OSD. (the various 
reasons are already discussed her...) the current driver is developed 
with external FrameBuffer in mind.
2: we are dealing with more than a singel TV-Application. I cannot 
imagine how to present a DVD-Menu on the DVB-OSD for example. (the first 
free player, that can do DVD-Menu with Linux should be available as i read)

so i did some experimenting with DirectFB and using a TV-Set as a 
display.(without an TV-Out on the VGA! all over VGA-Out! I used my old 
Matrox Millenium I/PCI)

I found a very simple solution for using a TV-Set as Display, with the 
following limitations:

You have to use a fully conected SCART-Cable on your TV. The signal to 
the TV is NOT!!! an FBAS signal. It uses separate RGB and an Composite 
Sync Signal.
Also your Graphic board should have an free programmable 
Clock-Generator. (Matrox(prefered by DirectFB), NVidia....)

You have to build a small interface (very less parts, only 1 TTL-IC as a 
Sync-Combiner) from your SUB-HD15 connector to Scart. The Sync combiner 
may be integrated in the Connector.

The resulting picture-quality with this kind of connection is realy 
good, because we donīt have to convert our Signal to PAL and back to 
RGB(in the TV-Set itself).

The only Software-thing you have to do, is to write the right modelines 
in "/etc/fb.set".

If anyone is interessted in my solution, mail me and i will post the 
settings and the circuit-diagramm.

ciaou
	Harry



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