[mythtv] Adding RunningStatus information to DVB EIT processing

[roger]

On 31/08/16 08:36, David Matthews wrote:
> On 24/08/2016 18:23, Roger James wrote:
>> I had quick look at David's patch. Has has added EIT parsing to tv_rec.
>> My feeling is that the maintenance of our copy of the EIT table object
>> should be kept in eitscanner and that should pass on internal EIT status
>> changes to the scheduler and if required to the active recorders as 
>> well.
>>
>> The EIT stuff is complex already and spreading it further seems to me a
>> bad design decision.
>>
>> My thinking at the moment is a two stage implementation firstly to sort
>> out handling of running status information in the EIT table object
>> itself. Then at a later stage add parsing of the running status table to
>> get more timely running status information.
>
> I'd consider my patch as a proof-of-concept rather than anything else. 
> I'd be the first to agree that it could be done better but I wanted to 
> minimise the changes.  I've been using this for a number of years and 
> wouldn't do without it.  The "bookmark on start" means that playback 
> almost always starts exactly at the start of the programme and the 
> "extend until finished" means the end of a programme isn't lost if it 
> overruns.
>
> I did find a few problems with the EIT collection and I don't think 
> all of them are fixed by my patch.  In some circumstances, 
> particularly with channel changes, EIT collection stops.  That's 
> obviously not an issue if it's just being used to populate the listing 
> information but would need to be fixed for continuous running status.
>
> The other issue with "extend until finished" that I never really 
> addressed is that affects scheduling since there's always the 
> possibility that the scheduler might have lined up a recording on 
> another channel for that tuner.
>
> Let me know if I can be of any help.  It would be lovely to be able to 
> ditch my patch in favour of having it done properly in Myth.
>
> Regards,
> David
>
Hi David,

Thanks for the response. My brain starts hurting every time I look at 
the EIT code! I had some discussions with Stuart and dekarl about EIT 
handling a while back (bug #11399) and I eventually made the the same 
decision that you made and went with my own cleanup patch.  I have some 
time now to tackle the issues again. I think I will attempt to clean up 
the DVB EIT handling first. The later issues of ETSI EN 300 468 and ETSI 
ETR 211 have clarified things a bit. Some of the things we are doing are 
just plain wrong, but fortunately harmless.

Are you using DVB eit tables or one of the of the other variants (ATSC 
etc.)? If you are using DVB does your network transmit the Running 
Status Table. I have yet to catch one here in the UK ( however my 
antenna on my test system is a piece of wet string hanging out of the 
window!).

Roger