[mythtv] mythtv blocking/crashing fix

[Daniel Thor Kristjansson]

The frontend is blocking forever when I tune into an off-air hdtv
channel. This patch exits mythtv after about 20 seconds of no input and
returns to mythtvfrontend.

I also have a fix that makes the httv backend a little more robust but
I'm still looking at how to tune it.

Please try this if you have a hdtv card, or you've had this problem
with another capture card.

Also, if someone familiar with the RingBuffer and tv_play has some time,
I'd like it if you look at this, this my first attempt hacking Myth and
I may have missed something.

-- Daniel
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Index: libs/libmythtv/RingBuffer.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/libs/libmythtv/RingBuffer.cpp,v
retrieving revision 1.90
diff -r1.90 RingBuffer.cpp
814a815
>     int readErr=0;
819c820
<         if (!availWait.wait(&availWaitMutex, 2000))
---
>         if (!availWait.wait(&availWaitMutex, 2000)) {
821a823,831
> 	    readErr++;
> 	    if (readErr>5) {
> 	      cerr << "Waited 10 seconds for data to become available, aborting" << endl;
> 	      wanttoread=0;
> 	      stopreads=true;
> 	      availWaitMutex.unlock();
> 	      return 0;
> 	    }
> 	}
Index: libs/libmythtv/tv_play.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/libs/libmythtv/tv_play.cpp,v
retrieving revision 1.149
diff -r1.149 tv_play.cpp
605a606,614
>         if (!activenvp->IsDecoderThreadAlive() && kState_None!=nextState) {
>             cerr<<"panic: decoder not alive and state not None"<<endl;
>             if (kState_WatchingLiveTV==nextState) {
>                 cerr<<"stopping recorder"<<endl;
>                 StopPlayerAndRecorder(false, true);
>                 recorder=false;
>             }
>             tmpInternalState=kState_None;
>         }