[mythtv] [PATCH] New filter API, first patch against CVS.

[Andrew Mahone]

This patch adds the FilterManager and FilterChain classes in libmythtv, and 
makes the necessary changes to NuppelVideoRecorder, NuppelVideoPlayer, and 
all VideoOut classes to use the new filter API.  It also includes an updated 
filters/README for the new interface, and ports to the new API for all 
filters currently in CVS.  The existing filters load and run on my machine, 
and existing filter settings should work without any changes.

There are a few things left to do before it's complete, but it already 
provides all of the filter functionality which existed with the previous 
interfaces.  The capture format selection code is written, but untested, 
because there are currently no filters which will request a format other than 
YV12.  FilterManager expects a filter named "convert" to exist, which it will 
insert when it can not connect the supported formats of two filters.  This 
filter does not yet exist, but it is not yet possible to construct a filter 
chain which needs it.  Filters can not output frames which are larger than 
the input frame, until I add some code to make sure the buffers are large 
enough for the largest frame size and format in the filter chain.

These issues are all on my TODO list, but I'm releasing the patch now because 
it is already complete as a working replacement to the old filter API.  I'll 
try to get the extra features working next.  The patch is attached, bzipped 
for size.
-- 
  Andrew Mahone
  andrewmahone AT eml DOT cc
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