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

doc/filters.texi

@@ -5813,9 +5813,7 @@ At each new frame a new row in the video is filled with the result of
 the cellular automaton next generation. The behavior when the whole
 frame is filled is defined by the @option{scroll} option.
 
-This source accepts a list of options in the form of
-@var{key}=@var{value} pairs separated by ":". A description of the
-accepted options follows.
+This source accepts the following options:
 
 @table @option
 @item filename, f

libavfilter/avfilter.c

@@ -660,6 +660,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         !strcmp(filter->filter->name,  "ass")     ||
         !strcmp(filter->filter->name,  "blackframe") ||
         !strcmp(filter->filter->name,  "boxblur"   ) ||
+        !strcmp(filter->filter->name,  "cellauto") ||
         !strcmp(filter->filter->name,  "colormatrix") ||
         !strcmp(filter->filter->name,  "crop"      ) ||
         !strcmp(filter->filter->name,  "cropdetect") ||

libavfilter/vsrc_cellauto.c

@@ -164,12 +164,6 @@ static int init(AVFilterContext *ctx, const char *args)
     CellAutoContext *cellauto = ctx->priv;
     int ret;
 
-    cellauto->class = &cellauto_class;
-    av_opt_set_defaults(cellauto);
-
-    if ((ret = av_set_options_string(cellauto, args, "=", ":")) < 0)
-        return ret;
-
     if (!cellauto->w && !cellauto->filename && !cellauto->pattern)
         av_opt_set(cellauto, "size", "320x518", 0);