[FFmpeg-devel] [PATCH] libavfilter: add a set of callbacks for null filters

[Bobby Bingham]

This series of patches adds a set of callback functions (start_frame,
draw_slice, etc) that the filters can use.  There is already a default
set of callbacks that get used if the filter specifies NULL for its
callback, but these aren't very good default implementations for those
filters which don't modify the video image data in any way:
- (pixel)aspect, crop, slicify, null, setpts, (no)format

Each of these filters was independently reimplementing most of these
callbacks already.
-- 
Bobby Bingham
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