[mythtv] [Experimental PATCH] BIG DVB PATCH V3.2 Released
Stuart Auchterlonie
stuarta at pasiphae.fsnet.co.uk
Mon Dec 20 15:39:31 UTC 2004
On Mon, Dec 20, 2004 at 10:46:41AM +0000, John Pullan wrote:
> On Mon, 2004-12-20 at 10:31 +0000, Tom Hughes wrote:
> >
> > > I wish I knew how STB's really did this kind of stuff. I suspect that
> > > because it's propriety hardware they can do more stuff. or maybe we just
> > > need a better mechanism for detecting lack of lock in the scan case.
> >
> > Well given that the UK muxes transmit a network table you only have
> > to find one frequency by scanning and you can then locate the others
> > using the network table so maybe they do that?
> >
>
> Which is what we do. But the pathological case is still not good. I'll
> have to have a play about with it sometime.
>
Perhaps this can be optimized somewhat.
Initiate a scan of channels 21 thru 69 looking only a carrier.
Then once you find it, look for all the sub channels on that mux.
If in the case of the UK you find a network table that provides
information on the other mux channel locations then just skip to those
channels and scan them.
You can always allow for a fallback case of scanning everything,
maybe call it an exhaustive scan or something...
Stuart
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