[mythtv] [PATCH] pcHDTV - Rewrite PIDs in PMT and PAT tables of recorded streams

[Jason Hoos]

Since I was bound and determined this week to get both of my whopping 2 HDTV 
stations working (I really need to get my condo association to fix the roof 
antenna!), attached is another patch for hdtvrecorder.  This one adds code to 
rewrite the stream PIDs that are in the PAT and PMT tables.  This came about 
because one of the stations I get has 4 substations, and they list them in 
reverse order in the PAT, which caused ffmpeg major headaches.  hdtvrecorder 
stripped out all but program 2 (they were numbered 2-5), and ffmpeg tried to 
grab the first station that was listed in the PAT, which was program 5.  It 
then promptly died with an obscure "avformat error: -1" message.

This patch adds two private methods to hdtvreceiver called RewritePAT and 
RewritePMT.  In addition to changing the PIDs in these tables to match the 
PIDs that are really being written to disk, they also change the program 
number of the output stream to 1.  Most importantly (with regards to the 
above problem), RewritePAT removes mention of the other programs from the PAT 
and leaves only the one that's actually in the file.

I've put this (and my previous patch) through a small battery of 
channel-changing and recording tests, and it seems to be working pretty well 
for the two stations I can test it with.

- Jason