[mythtv] Bug fix for DVD navigation.

[Michael O]

There's a couple of bugs in the internal DVD player that could do with 
fixing.

Patch to correct these is attached.


#1. The decoderbase.c:ChangeDVDTrack() has an infinite loop in it in 
some regards. If the result from GetCellStart() is the same for two 
different parts, then it loops forever. (This happens on the disc 2 of 
"The Incredibles" DVD I have).

My solution was to limit the wait to 0.5 seconds.

#2. The previous-chapter, and next-chapter command won't move to 
different titles on the DVD. I ammended the nextTrack()/prevTrack() 
routines to notice if they were at the end of a title, and move to the 
next title if it exits.

As a consequence of this, I moved numTitles into the class to avoid 
having to re-query this from dvdnav.

With this patch, mythtv no longer hangs when I put this DVD in and I can 
navigate the DVD.

(The actual titles still don't work yet becuase they're of type 
'Shuffle' which libdvdnav doesn't support).

M.


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