base: Manually implement AggregatorPad::current-level-time bindings to get correct type

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1729>

gstreamer-base/Gir.toml

@@ -238,6 +238,10 @@ manual_traits = ["AggregatorExtManual"]
 name = "GstBase.AggregatorPad"
 status = "generate"
 manual_traits = ["AggregatorPadExtManual"]
+    [[object.property]]
+    name = "current-level-time"
+    # ClockTime
+    manual = true
 
 [[object]]
 name = "GstBase.BaseParse"

gstreamer-base/src/aggregator_pad.rs

@@ -14,6 +14,44 @@ pub trait AggregatorPadExtManual: IsA<AggregatorPad> + 'static {
             from_glib_none(&ptr.segment as *const gst::ffi::GstSegment)
         }
     }
+
+    #[cfg(feature = "v1_28")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "v1_28")))]
+    #[doc(alias = "current-level-time")]
+    fn current_level_time(&self) -> Option<gst::ClockTime> {
+        ObjectExt::property(self.as_ref(), "current-level-time")
+    }
+
+    #[cfg(feature = "v1_28")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "v1_28")))]
+    #[doc(alias = "current-level-time")]
+    fn connect_current_level_time_notify<F: Fn(&Self) + Send + Sync + 'static>(
+        &self,
+        f: F,
+    ) -> glib::SignalHandlerId {
+        unsafe extern "C" fn notify_current_level_time_trampoline<
+            P: IsA<AggregatorPad>,
+            F: Fn(&P) + Send + Sync + 'static,
+        >(
+            this: *mut ffi::GstAggregatorPad,
+            _param_spec: glib::ffi::gpointer,
+            f: glib::ffi::gpointer,
+        ) {
+            let f: &F = &*(f as *const F);
+            f(AggregatorPad::from_glib_borrow(this).unsafe_cast_ref())
+        }
+        unsafe {
+            let f: Box<F> = Box::new(f);
+            glib::signal::connect_raw(
+                self.as_ptr() as *mut _,
+                c"notify::current-level-time".as_ptr() as *const _,
+                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
+                    notify_current_level_time_trampoline::<Self, F> as *const (),
+                )),
+                Box::into_raw(f),
+            )
+        }
+    }
 }
 
 impl<O: IsA<AggregatorPad>> AggregatorPadExtManual for O {}