lavfi: port MP il filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index da80ff5356..290c146d6b 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -4648,6 +4648,43 @@ Useful for enlarging pixel art images without reducing sharpness.
 @section swapuv
 Swap U & V plane.
 
+@section il
+Deinterleave or interleave fields.
+
+This filter allows to process interlaced images fields without
+deinterlacing them. Deinterleaving splits the input frame into 2
+fields (so called half pictures). Odd lines are moved to the top
+half of the output image, even lines to the bottom half.
+You can process (filter) them independently and then re-interleave them.
+
+It accepts a list of options in the form of @var{key}=@var{value} pairs
+separated by ":". A description of the accepted options follows.
+
+@table @option
+@item luma_mode, l
+@item chroma_mode, s
+@item alpha_mode, a
+Available values for @var{luma_mode}, @var{chroma_mode} and
+@var{alpha_mode} are:
+
+@table @samp
+@item none
+Do nothing.
+
+@item deinterleave, d
+Deinterleave fields, placing one above the other.
+
+@item interleave, i
+Interleave fields. Reversing effect of deinterleave.
+@end table
+Default value is @code{none}.
+
+@item luma_swap, ls
+@item chroma_swap, cs
+@item alpha_swap, as
+Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is @code{0}.
+@end table
+
 @section thumbnail
 Select the most representative frame in a given sequence of consecutive frames.