[mythtv] [exp. patch] xv xvmc merge

[Daniel Kristjansson]

Ok, this is a big patch.

It merges the XVideo and XvMC video output implementations.

This allows is fallback from XvMC to XVideo to X w/shared memory,
down to X without shared memory. I've added a "NO_XVMC" environment
variable to go with the "NO_XV" and "NO_SHM" environment variables,
so you can disable XvMC from the command line.

Of course, this also reduces redundancy since XvMC is just a special
case of XVideo.

There are a couple bug fixes:
  1/ If we run out of frames when blending the OSD in XvMC's
     ProcessFrame call we no longer deadlock, but instead 
     simply don't render the OSD. (and print an error message.)
  2/ If you change the letterbox mode to one that clips
     the frame at the top, it no longer results in extra
     vigorous bobbing.
  3/ If you don't have "GuiSizeForTV" set and resolution
     switching is enabled, the wrong size buffers were 
     allocated. This has been fixed.
Some features:
  A/ More fine grained locking. We now have a per-frame lock
     which allows ffmpeg to call DrawSlice to send packets
     to the video card, while an unrelated frame is being
     shown on the screen. (This also allows removal of
     "XXX Ugly hack" in the XvMC Show method).
  B/ Fall back mentioned before. i.e. if you have XvMC
     enabled, but no available adapter capable of it,
     then MythTV will try to fall back to a less efficient
     method instead of bailing.
Some possible/probable new bugs:
  a/ I've not yet added locking to the Init and tear-down rutines.
     This may cause problems due to InputChanged() method.
  b/ Some sections aren't finished and some changes tested and
     those are marked with "// TODO"
  c/ I may have missed a needed lock somewhere, or added a lock in
     the wrong order. (See top of videoout_xv.h for proper lock order.)
  d/ In avformatdecoder, I could not reset the stream completely I
     started it with a CODEC_ID_MPEG2VIDEO codec. So instead I
     start it with CODEC_ID_MPEG2VIDEO_XVMC[_VLD] and reset to
     the normal CODEC_ID_MPEG2VIDEO later if XVMC mode is not
     requested. This results in some "bad stream" messages, but
     is otherwise harmless.
  e/ something else...
Some unfixed bugs
  i/ Sometimes on "studder" when OSD is on screen.

Please test, especially on Epia and eith HDTV content, or if you are
currently experiencing lockups with the XvMC code in CVS.

This is a first draft, so there are probably unneeded changes, ugly
bits, etc.

-- Daniel
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