[linux-dvb] Re: dvb/cvs (2.4 mdk), modparm dvb_shutdown_timeoutweirdness

[Holger Waechtler <holger@convergence.de>]

Guido Draheim wrote:
> Tomi Ollila schrieb:
>
> > Wednesday Jun 4 12:57:52 +0200 2003 Guido Draheim 
> > <guidod-2003-@gmx.de> wrote:
> >
> > > Well Tomi,
> > >
> > > it's actually "annoying" - of course the /dev/video viewer
> >
> > ...
> >
> > that is.
> >
> > This article maybe explains the situation...:
> >
> > http://www.linuxtv.org/mailinglists/linux-dvb/2003/01-2003/msg00500.html
> and that thread has a different target being some dvb tools which
> access a device in /dev/dvb/*/* - it can be justified somehow to
> mandate a protocol that all applications to open a ./frontend*
> device (and to keep it open) when accessing a dvb/* device. However,
> I am speaking of the usual v4l device where applications do not
> expect to follow a certain protocol. That's subtly different, one
> can not just say "fix your applications".
:) yes, you can!
see below.

> Theoretically, the v4l/ devices even allow to tune (_FLAG_TUNER),
> exposing themselves as the frontend device to the videodev per se.
> (well, _frequency is not all there is a dvb stream). Therefore, and
> from the same theory, one might say that opening a v4l device
> must be registered internally as a frontend counter increment.
no, since an application can e.g. play back MPEG streams from hard disks 
you don't need to keep your frontend powered when acessing the demux or 
video devices.

This would for example prevent other receivers connected via loopthrough 
from getting the RF signal and control over the DiSEqC switch and LNB.

> Perhaps one could go the other way round: to disallow to open()
> the videodev unless a frontend* is open (e.g. some szap panel),
> so the user is not confused about the status. Naaaah, me not
> like it. Anyone...
just keep szap running in another console when you use szp/xawtv. On the 
long run just use a 'real' DVB application. Or develop your own one.

Holger



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