lavfi/setfield: switch to an AVOptions-based system.

doc/filters.texi

@@ -5057,9 +5057,12 @@ output frames. It does not change the input frame, but only sets the
 corresponding property, which affects how the frame is treated by
 following filters (e.g. @code{fieldorder} or @code{yadif}).
 
-This filter accepts a single option @option{mode}, which can be
-specified either by setting @code{mode=VALUE} or setting the value
-alone. Available values are:
+The filter accepts the following options:
+
+@table @option
+
+@item mode
+Available values are:
 
 @table @samp
 @item auto
@@ -5074,6 +5077,7 @@ Mark the frame as top-field-first.
 @item prog
 Mark the frame as progressive.
 @end table
+@end table
 
 @section showinfo
 

libavfilter/avfilter.c

@@ -751,6 +751,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         !strcmp(filter->filter->name, "setpts"       ) ||
         !strcmp(filter->filter->name, "settb"        ) ||
         !strcmp(filter->filter->name, "asettb"       ) ||
+        !strcmp(filter->filter->name, "setfield") ||
         !strcmp(filter->filter->name, "showspectrum") ||
         !strcmp(filter->filter->name, "silencedetect") ||
         !strcmp(filter->filter->name, "sine"     ) ||

libavfilter/vf_setfield.c

@@ -85,8 +85,6 @@ static const AVFilterPad setfield_outputs[] = {
     { NULL }
 };
 
-static const char *const shorthand[] = { "mode", NULL };
-
 AVFilter avfilter_vf_setfield = {
     .name      = "setfield",
     .description = NULL_IF_CONFIG_SMALL("Force field for the output video frame."),
@@ -94,5 +92,4 @@ AVFilter avfilter_vf_setfield = {
     .inputs    = setfield_inputs,
     .outputs   = setfield_outputs,
     .priv_class = &setfield_class,
-    .shorthand  = shorthand,
 };