[linux-dvb] Re: How to use the drivers from 2.5.x kernels?

[Benjamin Forgeau <forgeau@tu-harburg.de>]

	Hi Holger,

	Thanks for the quick answer. Ok, so basically, like before, a source  
file should have something like:

#include<linux/dvb/frontend.h>

And the makefile should add an additional include directory pointing on 
the drivers include dir. It would just be good to have it auto-detected 
if the actual kernel has such a directory. But ok, in the case someone 
wants to use a development version of the drivers, it is good to leave 
it as option.

	I'm just confused no known DVB application does try to identify the 
DVB include dir in the kernel. Maybe the latest VDR (I looked in 
vdr-1.1.18).

> The API documentation is right now only in the old DVB module. We'll 
> have to clean it up and then submit it to the kernel Documentation 
tree.

	All right.

> > 	Another thing, there is no "version.h" in the kernel include 
files. 
> > Why?? Will it disappear??
> 
> This one was omitted by accident, I sent it again to Alan Cox. You 
> should find it in the kernel release which includes the next patchset.

	Ok, but what is the purpose of it? Pre-compiled programs won't have 
the chance to determine the version of the API then (an old debate I 
think). If the purpose is to determine the name of the right device, it 
is strange to have it in the kernel, because either you use a devfs, 
and then the names are ok, or you use (ok, in the future) a file system 
set up by a linux distribution, and I don't know why the names should 
be in the old fashion.

	The FrontendCapabilities is sufficient to know what the frontend is 
able to do.

	Anyway, is there a good reason why it is necessary to support the API 
version 1??? For backward compatibility maybe, but the number of 
programs using DVB is still reasonnable.

> 
> 
> > 	And what is the status of OSD in the future releases?? There is a 
> > remark in the help message saying that it may not be supported 
later.
> 
> That's correct. Don't rely on it - this interface is very tight bound 
to 
> the AV7110 based DVB cards. Use e.g. DirectFB, SDL, XRender or any 
other 
> portable graphics API when you create a DVB video application.

	I don't quite understand. So you mean we have to forget about OSD??? 
Or a Frame Buffer device will come in the near future for OSD??

	By the way, maybe I missed something, but what is the status of 
sending raw data to the DVB display (you, know, in order to see DivX 
films on the DVB tv-out)??

	thanks for your enlightments.


		ben




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