[mythtv] DVB SI rework - Help needed

[roger]

Hello list,

I think am getting near to having a beta test version ready. But I have 
one major problem outstanding.

This relates to System Description Tables. The are (should?) only be 
used when channel scanning. However there is a strange piece of code in 
dvbstreamdata.cpp that refernces them:

void DVBStreamData::SetDesiredService(uint netid, uint tsid, int serviceid)
{
     bool reset = true;

/*    if (HasAllSDTSections(netid, tsid, TableID::SDT))
     {
     	// TODO Not sure why this is needed RFJ
		reset = false;
		_desired_netid = netid;
		_desired_tsid = tsid;
		SetDesiredProgram(serviceid);
     }*/

     if (reset)
         Reset(netid, tsid, serviceid);
}

As you can see I have commented it out in my test version. It is called 
from here:

void DTVSignalMonitor::SetDVBService(uint netid, uint tsid, int serviceid)


Which is called from here:

bool TVRec::SetupDTVSignalMonitor(bool EITscan)


The only thing I can think of is that it is trying avoid retuning 
everything if it  is already tuned to the correct multiplex. But what 
having a complete SD table has to do with that is not clear.

Does anybody know or care to speculate on what this lump of code is 
trying to achieve?

Roger