MODE_TOGGLE        51 libavfilter/f_perms.c         { "toggle", "switch permissions",               0, AV_OPT_TYPE_CONST, {.i64 = MODE_TOGGLE},     INT_MIN, INT_MAX, FLAGS, "mode" },
MODE_TOGGLE        87 libavfilter/f_perms.c     case MODE_TOGGLE:   out_perm = in_perm == RO ? RW : RO;                 break;