[mythtv] Myth DVB Diseqc

[julian furnell]

I am located in the UK using two LNBs with a 4 to 1 switch off a Nova 
DVB-S budget card. Using Myth 0.17 and cvs from a week ago I have been 
unable to get any signal from my second sat LNB into myth - setup scan 
and live tv only feed from first sat LNB. VDR happily receives from both 
sat so equipment is OK. The cause seems to be the following lines from 
line 243 in dvbdiseqc.cpp

   if (ioctl(fd_frontend, FE_DISEQC_SEND_BURST, SEC_MINI_A ) == -1)
   {
       ERRNO("FE_DISEQC_SEND_BURST failed");
       return false;
   }

The sending of this command follows the sending of the correct Diseqc 
command and causes my switch to revert to the A input. According to 
diseqc specs equipment  should ignore backwards compatible bursts after 
valid diseqc command but mine certainly doesn't and it is a common type 
in the UK  claiming Diseqc and mini-diseqc comptability. With this 
commented out Live Tv now works and I can see channels from both sats. 
Unfortunately it does not cause the setup scan to work - this appears to 
be a further problem where dvbdiseqc.cpp is being called from the 
scanning program with the diseqc type set to 0 - forgive me but my c++ 
isn't quite up to following where in the scanning software this is not 
being properly setup. With dvbdiseqc.cpp hard coded to type 4 scan seems 
work ok. I hope this helps those I have seen on lists saying diseqc is 
not working for them. I also noted another  bug in DVBDiSEqC::ToneSwitch 
which seems to be expecting tuning.diseqc_port to be set to 1 or 2 
rather than the 0 or 1 it is currently being set to. The attached patch 
corrects both of these issues for me.

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