+#define OFFSET(x) offsetof(DrawBoxContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption drawbox_options[] = {
+ { "x", "set the box top-left corner x position", OFFSET(x), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
+ { "y", "set the box top-left corner y position", OFFSET(y), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS },
+ { "w", "set the box width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
+ { "h", "set the box heigth", OFFSET(h), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
+ { "color", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "c", "set the box edge color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(drawbox);
+