[vdr] Re: unique channel id

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

"Rienecker, Fa. Evenio, ITS P, M" wrote:
> 
> > -----Original Message-----
> > From: Klaus Schmidinger [mailto:Klaus.Schmidinger@cadsoft.de]
> > Sent: Thursday, November 21, 2002 1:58 PM
> > To: vdr@linuxtv.org
> > Subject: [vdr] Re: unique channel id
> >
> >
> > Régis Bossut wrote:
> > >
> > > Klaus Schmidinger writes:
> > >
> > > [...]
> >
> > Well, in that case we could set up the channel ID as
> >
> >   SRC-NID-TID-SID-RID
> >
> > where RID is the Radio ID and is 0 or even left out for video channels.
> > That would get us back to having  an ID that consists only of data that
> > is _not_ used for the actual tuning process.
> >
> > What about that?
> 
> I don't want to uniquely identify a set of 'tuning parameters'.
> I do want to uniquely identify a 'channel'.
> 
> The relation is: 'channel' is tuned to by using the 'tuning parameters'
> 
> The point is, and that's why I reiterated the issue, that the above relation between channel and tuning parameters actualy vary with time. Especially APIDs.
> 
> And that's why you need an ID that expresses this relationship.
> In theory your choice is fine, but users identify channels by name not by tuning parameters. Since I agree upon the fact that the unique channel ID must be deductable for everyone I would suggest the 'channel name' as transmitted in the transport stream (or a hash value of the name) is used.

But who guarantees that no two channels will have the same name?
I guess it could easily happen that (even on the same SRC, i.e. satellite,
for instance) there are two channels on the same or different transponders
that have the exact same name. There's nothing that would prevent that from
happening.

Of course the _user_ will never have to identify channels by their channel ID.
The user will always be presented the channel name and/or the channel number
as it results from his/her channel setup.

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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