Port threadshare plugin to new subclassing API

7 files changed, 1088 insertions, 990 deletions

diff --git a/gst-plugin-threadshare/Cargo.toml b/gst-plugin-threadshare/Cargo.toml
index 961ac0f60..967c1b823 100644
--- a/gst-plugin-threadshare/Cargo.toml
+++ b/gst-plugin-threadshare/Cargo.toml
@@ -12,10 +12,8 @@ gio-sys = { git = "https://github.com/gtk-rs/sys" }
 gstreamer-sys = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs-sys" }
 glib = { git = "https://github.com/gtk-rs/glib", features = ["subclassing"] }
 gio = { git = "https://github.com/gtk-rs/gio" }
-gstreamer = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
+gstreamer = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", features = ["subclassing"] }
 gstreamer-check = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
-gobject-subclass = { git = "https://github.com/gtk-rs/gobject-subclass" }
-gst-plugin = { path = "../gst-plugin" }
 tokio = "0.1"
 tokio-reactor = "0.1"
 tokio-executor = "0.1"
diff --git a/gst-plugin-threadshare/src/appsrc.rs b/gst-plugin-threadshare/src/appsrc.rs
index d08df87be..32e4e9732 100644
--- a/gst-plugin-threadshare/src/appsrc.rs
+++ b/gst-plugin-threadshare/src/appsrc.rs
@@ -17,11 +17,11 @@
 
 use glib;
 use glib::prelude::*;
+use glib::subclass;
+use glib::subclass::prelude::*;
 use gst;
 use gst::prelude::*;
-
-use gobject_subclass::object::*;
-use gst_plugin::element::*;
+use gst::subclass::prelude::*;
 
 use std::sync::Mutex;
 use std::u32;
@@ -63,44 +63,56 @@ impl Default for Settings {
     }
 }
 
-static PROPERTIES: [Property; 5] = [
-    Property::String(
-        "context",
-        "Context",
-        "Context name to share threads with",
-        Some(DEFAULT_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "context-wait",
-        "Context Wait",
-        "Throttle poll loop to run at most once every this many ms",
-        (0, 1000),
-        DEFAULT_CONTEXT_WAIT,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "max-buffers",
-        "Max Buffers",
-        "Maximum number of buffers to queue up",
-        (1, u32::MAX),
-        DEFAULT_MAX_BUFFERS,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Boxed(
-        "caps",
-        "Caps",
-        "Caps to use",
-        gst::Caps::static_type,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Boolean(
-        "do-timestamp",
-        "Do Timestamp",
-        "Timestamp buffers with the current running time on arrival",
-        DEFAULT_DO_TIMESTAMP,
-        PropertyMutability::ReadWrite,
-    ),
+static PROPERTIES: [subclass::Property; 5] = [
+    subclass::Property("context", || {
+        glib::ParamSpec::string(
+            "context",
+            "Context",
+            "Context name to share threads with",
+            Some(DEFAULT_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context-wait", || {
+        glib::ParamSpec::uint(
+            "context-wait",
+            "Context Wait",
+            "Throttle poll loop to run at most once every this many ms",
+            0,
+            1000,
+            DEFAULT_CONTEXT_WAIT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("max-buffers", || {
+        glib::ParamSpec::uint(
+            "max-buffers",
+            "Max Buffers",
+            "Maximum number of buffers to queue up",
+            1,
+            u32::MAX,
+            DEFAULT_MAX_BUFFERS,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("caps", || {
+        glib::ParamSpec::boxed(
+            "caps",
+            "Caps",
+            "Caps to use",
+            gst::Caps::static_type(),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("do-timestamp", || {
+        glib::ParamSpec::boolean(
+            "do-timestamp",
+            "Do Timestamp",
+            "Timestamp buffers with the current running time on arrival",
+            DEFAULT_DO_TIMESTAMP,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
 ];
 
 struct State {
@@ -133,88 +145,6 @@ struct AppSrc {
 }
 
 impl AppSrc {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing app source",
-            "Source/Generic",
-            "Thread-sharing app source",
-            "Sebastian Dröge <sebastian@centricular.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(src_pad_template);
-
-        klass.install_properties(&PROPERTIES);
-
-        klass.add_action_signal(
-            "push-buffer",
-            &[gst::Buffer::static_type()],
-            bool::static_type(),
-            |args| {
-                let element = args[0]
-                    .get::<gst::Element>()
-                    .unwrap()
-                    .downcast::<Element>()
-                    .unwrap();
-                let buffer = args[1].get::<gst::Buffer>().unwrap();
-                let appsrc = element.get_impl().downcast_ref::<AppSrc>().unwrap();
-
-                Some(appsrc.push_buffer(&element, buffer).to_value())
-            },
-        );
-
-        klass.add_action_signal("end-of-stream", &[], bool::static_type(), |args| {
-            let element = args[0]
-                .get::<gst::Element>()
-                .unwrap()
-                .downcast::<Element>()
-                .unwrap();
-            let appsrc = element.get_impl().downcast_ref::<AppSrc>().unwrap();
-            Some(appsrc.end_of_stream(&element).to_value())
-        });
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("src").unwrap();
-        let src_pad = gst::Pad::new_from_template(&templ, "src");
-
-        src_pad.set_event_function(|pad, parent, event| {
-            AppSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_event(pad, element, event),
-            )
-        });
-        src_pad.set_query_function(|pad, parent, query| {
-            AppSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_query(pad, element, query),
-            )
-        });
-        element.add_pad(&src_pad).unwrap();
-
-        ::set_element_flags(element, gst::ElementFlags::SOURCE);
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-appsrc",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing app source",
-            ),
-            src_pad: src_pad,
-            state: Mutex::new(State::default()),
-            settings: Mutex::new(Settings::default()),
-        })
-    }
-
     fn create_io_context_event(state: &State) -> Option<gst::Event> {
         if let (&Some(ref pending_future_id), &Some(ref io_context)) =
             (&state.pending_future_id, &state.io_context)
@@ -232,7 +162,7 @@ impl AppSrc {
         }
     }
 
-    fn src_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -265,7 +195,12 @@ impl AppSrc {
         ret
     }
 
-    fn src_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn src_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         use gst::QueryView;
 
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
@@ -306,7 +241,7 @@ impl AppSrc {
         ret
     }
 
-    fn push_buffer(&self, element: &Element, mut buffer: gst::Buffer) -> bool {
+    fn push_buffer(&self, element: &gst::Element, mut buffer: gst::Buffer) -> bool {
         let settings = self.settings.lock().unwrap().clone();
 
         if settings.do_timestamp {
@@ -337,7 +272,7 @@ impl AppSrc {
         }
     }
 
-    fn end_of_stream(&self, element: &Element) -> bool {
+    fn end_of_stream(&self, element: &gst::Element) -> bool {
         let mut state = self.state.lock().unwrap();
         if let Some(ref mut channel) = state.channel {
             match channel.try_send(Either::Right(gst::Event::new_eos().build())) {
@@ -354,7 +289,7 @@ impl AppSrc {
 
     fn push_item(
         &self,
-        element: &Element,
+        element: &gst::Element,
         item: Either<gst::Buffer, gst::Event>,
     ) -> future::Either<
         Box<Future<Item = (), Error = ()> + Send + 'static>,
@@ -449,7 +384,7 @@ impl AppSrc {
         }
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         gst_debug!(self.cat, obj: element, "Preparing");
 
         let settings = self.settings.lock().unwrap().clone();
@@ -480,7 +415,7 @@ impl AppSrc {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         let mut state = self.state.lock().unwrap();
@@ -498,7 +433,7 @@ impl AppSrc {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let settings = self.settings.lock().unwrap().clone();
         let mut state = self.state.lock().unwrap();
@@ -515,7 +450,7 @@ impl AppSrc {
 
         let element_clone = element.clone();
         let future = channel_receiver.for_each(move |item| {
-            let appsrc = element_clone.get_impl().downcast_ref::<AppSrc>().unwrap();
+            let appsrc = Self::from_instance(&element_clone);
             appsrc.push_item(&element_clone, item)
         });
         io_context.spawn(future);
@@ -526,7 +461,7 @@ impl AppSrc {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let mut state = self.state.lock().unwrap();
 
@@ -539,28 +474,114 @@ impl AppSrc {
     }
 }
 
-impl ObjectImpl<Element> for AppSrc {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES[id as usize];
+impl ObjectSubclass for AppSrc {
+    const NAME: &'static str = "RsTsAppSrc";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing app source",
+            "Source/Generic",
+            "Thread-sharing app source",
+            "Sebastian Dröge <sebastian@centricular.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+
+        let src_pad_template = gst::PadTemplate::new(
+            "src",
+            gst::PadDirection::Src,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES);
+
+        klass.add_action_signal(
+            "push-buffer",
+            &[gst::Buffer::static_type()],
+            bool::static_type(),
+            |args| {
+                let element = args[0].get::<gst::Element>().unwrap();
+                let buffer = args[1].get::<gst::Buffer>().unwrap();
+                let appsrc = Self::from_instance(&element);
+
+                Some(appsrc.push_buffer(&element, buffer).to_value())
+            },
+        );
+
+        klass.add_action_signal("end-of-stream", &[], bool::static_type(), |args| {
+            let element = args[0].get::<gst::Element>().unwrap();
+            let appsrc = Self::from_instance(&element);
+            Some(appsrc.end_of_stream(&element).to_value())
+        });
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("src").unwrap();
+        let src_pad = gst::Pad::new_from_template(&templ, "src");
+
+        src_pad.set_event_function(|pad, parent, event| {
+            AppSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_event(pad, element, event),
+            )
+        });
+        src_pad.set_query_function(|pad, parent, query| {
+            AppSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-appsrc",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing app source",
+            ),
+            src_pad: src_pad,
+            state: Mutex::new(State::default()),
+            settings: Mutex::new(Settings::default()),
+        }
+    }
+}
+
+impl ObjectImpl for AppSrc {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context = value.get().unwrap_or_else(|| "".into());
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context_wait = value.get().unwrap();
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.caps = value.get();
             }
-            Property::UInt("max-buffers", ..) => {
+            subclass::Property("max-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_buffers = value.get().unwrap();
             }
-            Property::Boolean("do-timestamp", ..) => {
+            subclass::Property("do-timestamp", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.do_timestamp = value.get().unwrap();
             }
@@ -568,39 +589,48 @@ impl ObjectImpl<Element> for AppSrc {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context.to_value())
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context_wait.to_value())
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.caps.to_value())
             }
-            Property::UInt("max-buffers", ..) => {
+            subclass::Property("max-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_buffers.to_value())
             }
-            Property::Boolean("do-timestamp", ..) => {
+            subclass::Property("do-timestamp", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.do_timestamp.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.src_pad).unwrap();
+
+        ::set_element_flags(element, gst::ElementFlags::SOURCE);
+    }
 }
 
-impl ElementImpl<Element> for AppSrc {
+impl ElementImpl for AppSrc {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -624,7 +654,7 @@ impl ElementImpl<Element> for AppSrc {
             _ => (),
         }
 
-        let mut ret = element.parent_change_state(transition);
+        let mut ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -648,23 +678,6 @@ impl ElementImpl<Element> for AppSrc {
     }
 }
 
-struct AppSrcStatic;
-
-impl ImplTypeStatic<Element> for AppSrcStatic {
-    fn get_name(&self) -> &str {
-        "AppSrc"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        AppSrc::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        AppSrc::class_init(klass);
-    }
-}
-
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    let type_ = register_type(AppSrcStatic);
-    gst::Element::register(plugin, "ts-appsrc", 0, type_)
+    gst::Element::register(plugin, "ts-appsrc", 0, AppSrc::get_type())
 }
diff --git a/gst-plugin-threadshare/src/lib.rs b/gst-plugin-threadshare/src/lib.rs
index 65f8fd302..47d8e5746 100644
--- a/gst-plugin-threadshare/src/lib.rs
+++ b/gst-plugin-threadshare/src/lib.rs
@@ -27,9 +27,6 @@ extern crate gstreamer_sys as gst_ffi;
 extern crate gio;
 #[macro_use]
 extern crate glib;
-extern crate gobject_subclass;
-#[macro_use]
-extern crate gst_plugin;
 #[macro_use]
 extern crate gstreamer as gst;
 
@@ -73,16 +70,16 @@ fn plugin_init(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
     Ok(())
 }
 
-plugin_define!(
-    b"threadshare\0",
-    b"Threadshare Plugin\0",
+gst_plugin_define!(
+    "threadshare",
+    "Threadshare Plugin",
     plugin_init,
-    b"0.1.0\0",
-    b"LGPL\0",
-    b"threadshare\0",
-    b"threadshare\0",
-    b"https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs\0",
-    b"2018-03-01\0"
+    "0.1.0",
+    "LGPL",
+    "threadshare",
+    "threadshare",
+    "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs",
+    "2018-03-01"
 );
 
 pub fn set_element_flags<T: glib::IsA<gst::Object> + glib::IsA<gst::Element>>(
diff --git a/gst-plugin-threadshare/src/proxy.rs b/gst-plugin-threadshare/src/proxy.rs
index 93ce47aab..08fac9a79 100644
--- a/gst-plugin-threadshare/src/proxy.rs
+++ b/gst-plugin-threadshare/src/proxy.rs
@@ -17,11 +17,11 @@
 
 use glib;
 use glib::prelude::*;
+use glib::subclass;
+use glib::subclass::prelude::*;
 use gst;
 use gst::prelude::*;
-
-use gobject_subclass::object::*;
-use gst_plugin::element::*;
+use gst::subclass::prelude::*;
 
 use std::collections::HashMap;
 use std::collections::VecDeque;
@@ -87,62 +87,80 @@ impl Default for SettingsSrc {
     }
 }
 
-static PROPERTIES_SRC: [Property; 6] = [
-    Property::UInt(
-        "max-size-buffers",
-        "Max Size Buffers",
-        "Maximum number of buffers to queue (0=unlimited)",
-        (0, u32::MAX),
-        DEFAULT_MAX_SIZE_BUFFERS,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "max-size-bytes",
-        "Max Size Bytes",
-        "Maximum number of bytes to queue (0=unlimited)",
-        (0, u32::MAX),
-        DEFAULT_MAX_SIZE_BYTES,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt64(
-        "max-size-time",
-        "Max Size Time",
-        "Maximum number of nanoseconds to queue (0=unlimited)",
-        (0, u64::MAX - 1),
-        DEFAULT_MAX_SIZE_TIME,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::String(
-        "context",
-        "Context",
-        "Context name to share threads with",
-        Some(DEFAULT_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "context-wait",
-        "Context Wait",
-        "Throttle poll loop to run at most once every this many ms",
-        (0, 1000),
-        DEFAULT_CONTEXT_WAIT,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::String(
+static PROPERTIES_SRC: [subclass::Property; 6] = [
+    subclass::Property("max-size-buffers", || {
+        glib::ParamSpec::uint(
+            "max-size-buffers",
+            "Max Size Buffers",
+            "Maximum number of buffers to queue (0=unlimited)",
+            0,
+            u32::MAX,
+            DEFAULT_MAX_SIZE_BUFFERS,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("max-size-bytes", || {
+        glib::ParamSpec::uint(
+            "max-size-bytes",
+            "Max Size Bytes",
+            "Maximum number of bytes to queue (0=unlimited)",
+            0,
+            u32::MAX,
+            DEFAULT_MAX_SIZE_BYTES,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("max-size-time", || {
+        glib::ParamSpec::uint64(
+            "max-size-time",
+            "Max Size Time",
+            "Maximum number of nanoseconds to queue (0=unlimited)",
+            0,
+            u64::MAX - 1,
+            DEFAULT_MAX_SIZE_TIME,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context", || {
+        glib::ParamSpec::string(
+            "context",
+            "Context",
+            "Context name to share threads with",
+            Some(DEFAULT_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context-wait", || {
+        glib::ParamSpec::uint(
+            "context-wait",
+            "Context Wait",
+            "Throttle poll loop to run at most once every this many ms",
+            0,
+            1000,
+            DEFAULT_CONTEXT_WAIT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("proxy-context", || {
+        glib::ParamSpec::string(
+            "proxy-context",
+            "Proxy Context",
+            "Context name of the proxy to share with",
+            Some(DEFAULT_PROXY_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+];
+
+static PROPERTIES_SINK: [subclass::Property; 1] = [subclass::Property("proxy-context", || {
+    glib::ParamSpec::string(
         "proxy-context",
         "Proxy Context",
         "Context name of the proxy to share with",
         Some(DEFAULT_PROXY_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-];
-
-static PROPERTIES_SINK: [Property; 1] = [Property::String(
-    "proxy-context",
-    "Proxy Context",
-    "Context name of the proxy to share with",
-    Some(DEFAULT_PROXY_CONTEXT),
-    PropertyMutability::ReadWrite,
-)];
+        glib::ParamFlags::READWRITE,
+    )
+})];
 
 // TODO: Refactor into a Sender and Receiver instead of the have_ booleans
 
@@ -273,80 +291,10 @@ struct ProxySink {
 }
 
 impl ProxySink {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing proxy sink",
-            "Sink/Generic",
-            "Thread-sharing proxy sink",
-            "Sebastian Dröge <sebastian@centricular.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-
-        let sink_pad_template = gst::PadTemplate::new(
-            "sink",
-            gst::PadDirection::Sink,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(sink_pad_template);
-
-        klass.install_properties(&PROPERTIES_SINK);
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("sink").unwrap();
-        let sink_pad = gst::Pad::new_from_template(&templ, "sink");
-
-        sink_pad.set_chain_function(|pad, parent, buffer| {
-            ProxySink::catch_panic_pad_function(
-                parent,
-                || gst::FlowReturn::Error,
-                |queue, element| queue.sink_chain(pad, element, buffer),
-            )
-        });
-        sink_pad.set_chain_list_function(|pad, parent, list| {
-            ProxySink::catch_panic_pad_function(
-                parent,
-                || gst::FlowReturn::Error,
-                |queue, element| queue.sink_chain_list(pad, element, list),
-            )
-        });
-        sink_pad.set_event_function(|pad, parent, event| {
-            ProxySink::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.sink_event(pad, element, event),
-            )
-        });
-        sink_pad.set_query_function(|pad, parent, query| {
-            ProxySink::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.sink_query(pad, element, query),
-            )
-        });
-
-        element.add_pad(&sink_pad).unwrap();
-
-        ::set_element_flags(element, gst::ElementFlags::SINK);
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-proxysink",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing proxy sink",
-            ),
-            sink_pad: sink_pad,
-            state: Mutex::new(StateSink::default()),
-            settings: Mutex::new(SettingsSink::default()),
-        })
-    }
-
     fn enqueue_item(
         &self,
         _pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         item: DataQueueItem,
     ) -> gst::FlowReturn {
         let wait_future = {
@@ -426,10 +374,7 @@ impl ProxySink {
 
                         let element_clone = element.clone();
                         let future = future::poll_fn(move || {
-                            let sink = element_clone
-                                .get_impl()
-                                .downcast_ref::<ProxySink>()
-                                .unwrap();
+                            let sink = Self::from_instance(&element_clone);
                             let state = sink.state.lock().unwrap();
 
                             gst_log!(
@@ -549,7 +494,7 @@ impl ProxySink {
     fn sink_chain(
         &self,
         pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         buffer: gst::Buffer,
     ) -> gst::FlowReturn {
         gst_log!(self.cat, obj: pad, "Handling buffer {:?}", buffer);
@@ -559,14 +504,14 @@ impl ProxySink {
     fn sink_chain_list(
         &self,
         pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         list: gst::BufferList,
     ) -> gst::FlowReturn {
         gst_log!(self.cat, obj: pad, "Handling buffer list {:?}", list);
         self.enqueue_item(pad, element, DataQueueItem::BufferList(list))
     }
 
-    fn sink_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn sink_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -612,13 +557,18 @@ impl ProxySink {
         true
     }
 
-    fn sink_query(&self, pad: &gst::Pad, element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn sink_query(
+        &self,
+        pad: &gst::Pad,
+        element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
 
         pad.query_default(element, query)
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         gst_debug!(self.cat, obj: element, "Preparing");
 
         let settings = self.settings.lock().unwrap().clone();
@@ -640,7 +590,7 @@ impl ProxySink {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         let mut state = self.state.lock().unwrap();
@@ -650,7 +600,7 @@ impl ProxySink {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let state = self.state.lock().unwrap();
 
@@ -662,7 +612,7 @@ impl ProxySink {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let mut state = self.state.lock().unwrap();
 
@@ -682,12 +632,93 @@ impl ProxySink {
     }
 }
 
-impl ObjectImpl<Element> for ProxySink {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES_SINK[id as usize];
+impl ObjectSubclass for ProxySink {
+    const NAME: &'static str = "RsTsProxySink";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing proxy sink",
+            "Sink/Generic",
+            "Thread-sharing proxy sink",
+            "Sebastian Dröge <sebastian@centricular.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+
+        let sink_pad_template = gst::PadTemplate::new(
+            "sink",
+            gst::PadDirection::Sink,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(sink_pad_template);
+
+        klass.install_properties(&PROPERTIES_SINK);
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("sink").unwrap();
+        let sink_pad = gst::Pad::new_from_template(&templ, "sink");
+
+        sink_pad.set_chain_function(|pad, parent, buffer| {
+            ProxySink::catch_panic_pad_function(
+                parent,
+                || gst::FlowReturn::Error,
+                |queue, element| queue.sink_chain(pad, element, buffer),
+            )
+        });
+        sink_pad.set_chain_list_function(|pad, parent, list| {
+            ProxySink::catch_panic_pad_function(
+                parent,
+                || gst::FlowReturn::Error,
+                |queue, element| queue.sink_chain_list(pad, element, list),
+            )
+        });
+        sink_pad.set_event_function(|pad, parent, event| {
+            ProxySink::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.sink_event(pad, element, event),
+            )
+        });
+        sink_pad.set_query_function(|pad, parent, query| {
+            ProxySink::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.sink_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-proxysink",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing proxy sink",
+            ),
+            sink_pad: sink_pad,
+            state: Mutex::new(StateSink::default()),
+            settings: Mutex::new(SettingsSink::default()),
+        }
+    }
+}
+
+impl ObjectImpl for ProxySink {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES_SINK[id];
 
         match *prop {
-            Property::String("proxy-context", ..) => {
+            subclass::Property("proxy-context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.proxy_context = value.get().unwrap_or_else(|| "".into());
             }
@@ -695,23 +726,32 @@ impl ObjectImpl<Element> for ProxySink {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES_SINK[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES_SINK[id];
 
         match *prop {
-            Property::String("proxy-context", ..) => {
+            subclass::Property("proxy-context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.proxy_context.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.sink_pad).unwrap();
+
+        ::set_element_flags(element, gst::ElementFlags::SINK);
+    }
 }
 
-impl ElementImpl<Element> for ProxySink {
+impl ElementImpl for ProxySink {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -735,7 +775,7 @@ impl ElementImpl<Element> for ProxySink {
             _ => (),
         }
 
-        let ret = element.parent_change_state(transition);
+        let ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -760,71 +800,6 @@ struct ProxySrc {
 }
 
 impl ProxySrc {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing proxy source",
-            "Source/Generic",
-            "Thread-sharing proxy source",
-            "Sebastian Dröge <sebastian@centricular.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(src_pad_template);
-
-        klass.install_properties(&PROPERTIES_SRC);
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("src").unwrap();
-        let src_pad = gst::Pad::new_from_template(&templ, "src");
-
-        src_pad.set_event_function(|pad, parent, event| {
-            ProxySrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_event(pad, element, event),
-            )
-        });
-        src_pad.set_query_function(|pad, parent, query| {
-            ProxySrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_query(pad, element, query),
-            )
-        });
-        element.add_pad(&src_pad).unwrap();
-
-        ::set_element_flags(element, gst::ElementFlags::SOURCE);
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-proxysrc",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing proxy source",
-            ),
-            src_pad: src_pad,
-            state: Mutex::new(StateSrc::default()),
-            settings: Mutex::new(SettingsSrc::default()),
-        })
-    }
-
-    fn catch_panic_pad_function<T, F: FnOnce(&Self, &Element) -> T, G: FnOnce() -> T>(
-        parent: &Option<gst::Object>,
-        fallback: G,
-        f: F,
-    ) -> T {
-        let element = parent.as_ref().unwrap().downcast_ref::<Element>().unwrap();
-        let src = element.get_impl().downcast_ref::<ProxySrc>().unwrap();
-        element.catch_panic(fallback, |element| f(src, element))
-    }
-
     fn create_io_context_event(state: &StateSrc) -> Option<gst::Event> {
         if let (&Some(ref pending_future_id), &Some(ref io_context)) =
             (&state.pending_future_id, &state.io_context)
@@ -842,7 +817,7 @@ impl ProxySrc {
         }
     }
 
-    fn src_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -875,7 +850,12 @@ impl ProxySrc {
         ret
     }
 
-    fn src_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn src_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         use gst::QueryView;
 
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
@@ -917,7 +897,7 @@ impl ProxySrc {
 
     fn push_item(
         &self,
-        element: &Element,
+        element: &gst::Element,
         item: DataQueueItem,
     ) -> future::Either<
         Box<Future<Item = (), Error = gst::FlowError> + Send + 'static>,
@@ -1045,7 +1025,7 @@ impl ProxySrc {
         }
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         gst_debug!(self.cat, obj: element, "Preparing");
 
         let settings = self.settings.lock().unwrap().clone();
@@ -1095,14 +1075,11 @@ impl ProxySrc {
             .schedule(
                 &io_context,
                 move |item| {
-                    let src = element_clone.get_impl().downcast_ref::<ProxySrc>().unwrap();
+                    let src = Self::from_instance(&element_clone);
                     src.push_item(&element_clone, item)
                 },
                 move |err| {
-                    let src = element_clone2
-                        .get_impl()
-                        .downcast_ref::<ProxySrc>()
-                        .unwrap();
+                    let src = Self::from_instance(&element_clone2);
                     gst_error!(src.cat, obj: &element_clone2, "Got error {}", err);
                     match err {
                         gst::FlowError::CustomError => (),
@@ -1143,7 +1120,7 @@ impl ProxySrc {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         // FIXME: The IO Context has to be alive longer than the queue,
@@ -1181,7 +1158,7 @@ impl ProxySrc {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let state = self.state.lock().unwrap();
         let queue = state.queue.as_ref().unwrap().0.lock().unwrap();
@@ -1195,7 +1172,7 @@ impl ProxySrc {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let state = self.state.lock().unwrap();
         let mut queue = state.queue.as_ref().unwrap().0.lock().unwrap();
@@ -1212,32 +1189,99 @@ impl ProxySrc {
     }
 }
 
-impl ObjectImpl<Element> for ProxySrc {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES_SRC[id as usize];
+impl ObjectSubclass for ProxySrc {
+    const NAME: &'static str = "RsTsProxySrc";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing proxy source",
+            "Source/Generic",
+            "Thread-sharing proxy source",
+            "Sebastian Dröge <sebastian@centricular.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+
+        let src_pad_template = gst::PadTemplate::new(
+            "src",
+            gst::PadDirection::Src,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES_SRC);
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("src").unwrap();
+        let src_pad = gst::Pad::new_from_template(&templ, "src");
+
+        src_pad.set_event_function(|pad, parent, event| {
+            ProxySrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_event(pad, element, event),
+            )
+        });
+        src_pad.set_query_function(|pad, parent, query| {
+            ProxySrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-proxysrc",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing proxy source",
+            ),
+            src_pad: src_pad,
+            state: Mutex::new(StateSrc::default()),
+            settings: Mutex::new(SettingsSrc::default()),
+        }
+    }
+}
+
+impl ObjectImpl for ProxySrc {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES_SRC[id];
 
         match *prop {
-            Property::UInt("max-size-buffers", ..) => {
+            subclass::Property("max-size-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_buffers = value.get().unwrap();
             }
-            Property::UInt("max-size-bytes", ..) => {
+            subclass::Property("max-size-bytes", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_bytes = value.get().unwrap();
             }
-            Property::UInt64("max-size-time", ..) => {
+            subclass::Property("max-size-time", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_time = value.get().unwrap();
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context = value.get().unwrap_or_else(|| "".into());
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context_wait = value.get().unwrap();
             }
-            Property::String("proxy-context", ..) => {
+            subclass::Property("proxy-context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.proxy_context = value.get().unwrap_or_else(|| "".into());
             }
@@ -1245,43 +1289,52 @@ impl ObjectImpl<Element> for ProxySrc {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES_SRC[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES_SRC[id];
 
         match *prop {
-            Property::UInt("max-size-buffers", ..) => {
+            subclass::Property("max-size-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_buffers.to_value())
             }
-            Property::UInt("max-size-bytes", ..) => {
+            subclass::Property("max-size-bytes", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_bytes.to_value())
             }
-            Property::UInt64("max-size-time", ..) => {
+            subclass::Property("max-size-time", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_time.to_value())
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context.to_value())
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context_wait.to_value())
             }
-            Property::String("proxy-context", ..) => {
+            subclass::Property("proxy-context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.proxy_context.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.src_pad).unwrap();
+
+        ::set_element_flags(element, gst::ElementFlags::SOURCE);
+    }
 }
 
-impl ElementImpl<Element> for ProxySrc {
+impl ElementImpl for ProxySrc {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -1305,7 +1358,7 @@ impl ElementImpl<Element> for ProxySrc {
             _ => (),
         }
 
-        let mut ret = element.parent_change_state(transition);
+        let mut ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -1325,42 +1378,7 @@ impl ElementImpl<Element> for ProxySrc {
     }
 }
 
-struct ProxySinkStatic;
-
-impl ImplTypeStatic<Element> for ProxySinkStatic {
-    fn get_name(&self) -> &str {
-        "ProxySink"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        ProxySink::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        ProxySink::class_init(klass);
-    }
-}
-
-struct ProxySrcStatic;
-
-impl ImplTypeStatic<Element> for ProxySrcStatic {
-    fn get_name(&self) -> &str {
-        "ProxySrc"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        ProxySrc::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        ProxySrc::class_init(klass);
-    }
-}
-
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    let type_ = register_type(ProxySinkStatic);
-    gst::Element::register(plugin, "ts-proxysink", 0, type_)?;
-
-    let type_ = register_type(ProxySrcStatic);
-    gst::Element::register(plugin, "ts-proxysrc", 0, type_)
+    gst::Element::register(plugin, "ts-proxysink", 0, ProxySink::get_type())?;
+    gst::Element::register(plugin, "ts-proxysrc", 0, ProxySrc::get_type())
 }
diff --git a/gst-plugin-threadshare/src/queue.rs b/gst-plugin-threadshare/src/queue.rs
index 540879fc3..8122e6236 100644
--- a/gst-plugin-threadshare/src/queue.rs
+++ b/gst-plugin-threadshare/src/queue.rs
@@ -17,11 +17,11 @@
 
 use glib;
 use glib::prelude::*;
+use glib::subclass;
+use glib::subclass::prelude::*;
 use gst;
 use gst::prelude::*;
-
-use gobject_subclass::object::*;
-use gst_plugin::element::*;
+use gst::subclass::prelude::*;
 
 use std::collections::VecDeque;
 use std::sync::Mutex;
@@ -64,46 +64,60 @@ impl Default for Settings {
     }
 }
 
-static PROPERTIES: [Property; 5] = [
-    Property::UInt(
-        "max-size-buffers",
-        "Max Size Buffers",
-        "Maximum number of buffers to queue (0=unlimited)",
-        (0, u32::MAX),
-        DEFAULT_MAX_SIZE_BUFFERS,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "max-size-bytes",
-        "Max Size Bytes",
-        "Maximum number of bytes to queue (0=unlimited)",
-        (0, u32::MAX),
-        DEFAULT_MAX_SIZE_BYTES,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt64(
-        "max-size-time",
-        "Max Size Time",
-        "Maximum number of nanoseconds to queue (0=unlimited)",
-        (0, u64::MAX - 1),
-        DEFAULT_MAX_SIZE_TIME,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::String(
-        "context",
-        "Context",
-        "Context name to share threads with",
-        Some(DEFAULT_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "context-wait",
-        "Context Wait",
-        "Throttle poll loop to run at most once every this many ms",
-        (0, 1000),
-        DEFAULT_CONTEXT_WAIT,
-        PropertyMutability::ReadWrite,
-    ),
+static PROPERTIES: [subclass::Property; 5] = [
+    subclass::Property("max-size-buffers", || {
+        glib::ParamSpec::uint(
+            "max-size-buffers",
+            "Max Size Buffers",
+            "Maximum number of buffers to queue (0=unlimited)",
+            0,
+            u32::MAX,
+            DEFAULT_MAX_SIZE_BUFFERS,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("max-size-bytes", || {
+        glib::ParamSpec::uint(
+            "max-size-bytes",
+            "Max Size Bytes",
+            "Maximum number of bytes to queue (0=unlimited)",
+            0,
+            u32::MAX,
+            DEFAULT_MAX_SIZE_BYTES,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("max-size-time", || {
+        glib::ParamSpec::uint64(
+            "max-size-time",
+            "Max Size Time",
+            "Maximum number of nanoseconds to queue (0=unlimited)",
+            0,
+            u64::MAX - 1,
+            DEFAULT_MAX_SIZE_TIME,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context", || {
+        glib::ParamSpec::string(
+            "context",
+            "Context",
+            "Context name to share threads with",
+            Some(DEFAULT_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context-wait", || {
+        glib::ParamSpec::uint(
+            "context-wait",
+            "Context Wait",
+            "Throttle poll loop to run at most once every this many ms",
+            0,
+            1000,
+            DEFAULT_CONTEXT_WAIT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
 ];
 
 struct State {
@@ -141,100 +155,6 @@ struct Queue {
 }
 
 impl Queue {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing queue",
-            "Generic",
-            "Simple data queue",
-            "Sebastian Dröge <sebastian@centricular.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-
-        let sink_pad_template = gst::PadTemplate::new(
-            "sink",
-            gst::PadDirection::Sink,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(sink_pad_template);
-
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(src_pad_template);
-
-        klass.install_properties(&PROPERTIES);
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("sink").unwrap();
-        let sink_pad = gst::Pad::new_from_template(&templ, "sink");
-        let templ = element.get_pad_template("src").unwrap();
-        let src_pad = gst::Pad::new_from_template(&templ, "src");
-
-        sink_pad.set_chain_function(|pad, parent, buffer| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || gst::FlowReturn::Error,
-                |queue, element| queue.sink_chain(pad, element, buffer),
-            )
-        });
-        sink_pad.set_chain_list_function(|pad, parent, list| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || gst::FlowReturn::Error,
-                |queue, element| queue.sink_chain_list(pad, element, list),
-            )
-        });
-        sink_pad.set_event_function(|pad, parent, event| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.sink_event(pad, element, event),
-            )
-        });
-        sink_pad.set_query_function(|pad, parent, query| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.sink_query(pad, element, query),
-            )
-        });
-
-        src_pad.set_event_function(|pad, parent, event| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_event(pad, element, event),
-            )
-        });
-        src_pad.set_query_function(|pad, parent, query| {
-            Queue::catch_panic_pad_function(
-                parent,
-                || false,
-                |queue, element| queue.src_query(pad, element, query),
-            )
-        });
-        element.add_pad(&sink_pad).unwrap();
-        element.add_pad(&src_pad).unwrap();
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-queue",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing queue",
-            ),
-            sink_pad: sink_pad,
-            src_pad: src_pad,
-            state: Mutex::new(State::default()),
-            settings: Mutex::new(Settings::default()),
-        })
-    }
-
     fn create_io_context_event(state: &State) -> Option<gst::Event> {
         if let (&Some(ref pending_future_id), &Some(ref io_context)) =
             (&state.pending_future_id, &state.io_context)
@@ -255,7 +175,7 @@ impl Queue {
     fn enqueue_item(
         &self,
         _pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         item: DataQueueItem,
     ) -> gst::FlowReturn {
         let wait_future = {
@@ -325,7 +245,7 @@ impl Queue {
 
                         let element_clone = element.clone();
                         let future = future::poll_fn(move || {
-                            let queue = element_clone.get_impl().downcast_ref::<Queue>().unwrap();
+                            let queue = Self::from_instance(&element_clone);
                             let mut state = queue.state.lock().unwrap();
 
                             let State {
@@ -430,7 +350,7 @@ impl Queue {
     fn sink_chain(
         &self,
         pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         buffer: gst::Buffer,
     ) -> gst::FlowReturn {
         gst_log!(self.cat, obj: pad, "Handling buffer {:?}", buffer);
@@ -440,14 +360,14 @@ impl Queue {
     fn sink_chain_list(
         &self,
         pad: &gst::Pad,
-        element: &Element,
+        element: &gst::Element,
         list: gst::BufferList,
     ) -> gst::FlowReturn {
         gst_log!(self.cat, obj: pad, "Handling buffer list {:?}", list);
         self.enqueue_item(pad, element, DataQueueItem::BufferList(list))
     }
 
-    fn sink_event(&self, pad: &gst::Pad, element: &Element, mut event: gst::Event) -> bool {
+    fn sink_event(&self, pad: &gst::Pad, element: &gst::Element, mut event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -505,7 +425,12 @@ impl Queue {
         }
     }
 
-    fn sink_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn sink_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
 
         if query.is_serialized() {
@@ -518,7 +443,7 @@ impl Queue {
         }
     }
 
-    fn src_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -542,7 +467,12 @@ impl Queue {
         self.sink_pad.push_event(event)
     }
 
-    fn src_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn src_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         use gst::QueryView;
 
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
@@ -578,7 +508,7 @@ impl Queue {
 
     fn push_item(
         &self,
-        element: &Element,
+        element: &gst::Element,
         item: DataQueueItem,
     ) -> future::Either<
         Box<Future<Item = (), Error = gst::FlowError> + Send + 'static>,
@@ -679,7 +609,7 @@ impl Queue {
         }
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         gst_debug!(self.cat, obj: element, "Preparing");
 
         let settings = self.settings.lock().unwrap().clone();
@@ -719,11 +649,11 @@ impl Queue {
             .schedule(
                 &io_context,
                 move |item| {
-                    let queue = element_clone.get_impl().downcast_ref::<Queue>().unwrap();
+                    let queue = Self::from_instance(&element_clone);
                     queue.push_item(&element_clone, item)
                 },
                 move |err| {
-                    let queue = element_clone2.get_impl().downcast_ref::<Queue>().unwrap();
+                    let queue = Self::from_instance(&element_clone2);
                     gst_error!(queue.cat, obj: &element_clone2, "Got error {}", err);
                     match err {
                         gst::FlowError::CustomError => (),
@@ -762,7 +692,7 @@ impl Queue {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         // FIXME: The IO Context has to be alive longer than the queue,
@@ -792,7 +722,7 @@ impl Queue {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let mut state = self.state.lock().unwrap();
 
@@ -806,7 +736,7 @@ impl Queue {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let mut state = self.state.lock().unwrap();
 
@@ -826,28 +756,135 @@ impl Queue {
     }
 }
 
-impl ObjectImpl<Element> for Queue {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES[id as usize];
+impl ObjectSubclass for Queue {
+    const NAME: &'static str = "RsTsQueue";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing queue",
+            "Generic",
+            "Simple data queue",
+            "Sebastian Dröge <sebastian@centricular.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+
+        let sink_pad_template = gst::PadTemplate::new(
+            "sink",
+            gst::PadDirection::Sink,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(sink_pad_template);
+
+        let src_pad_template = gst::PadTemplate::new(
+            "src",
+            gst::PadDirection::Src,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES);
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("sink").unwrap();
+        let sink_pad = gst::Pad::new_from_template(&templ, "sink");
+        let templ = klass.get_pad_template("src").unwrap();
+        let src_pad = gst::Pad::new_from_template(&templ, "src");
+
+        sink_pad.set_chain_function(|pad, parent, buffer| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || gst::FlowReturn::Error,
+                |queue, element| queue.sink_chain(pad, element, buffer),
+            )
+        });
+        sink_pad.set_chain_list_function(|pad, parent, list| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || gst::FlowReturn::Error,
+                |queue, element| queue.sink_chain_list(pad, element, list),
+            )
+        });
+        sink_pad.set_event_function(|pad, parent, event| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.sink_event(pad, element, event),
+            )
+        });
+        sink_pad.set_query_function(|pad, parent, query| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.sink_query(pad, element, query),
+            )
+        });
+
+        src_pad.set_event_function(|pad, parent, event| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_event(pad, element, event),
+            )
+        });
+        src_pad.set_query_function(|pad, parent, query| {
+            Queue::catch_panic_pad_function(
+                parent,
+                || false,
+                |queue, element| queue.src_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-queue",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing queue",
+            ),
+            sink_pad: sink_pad,
+            src_pad: src_pad,
+            state: Mutex::new(State::default()),
+            settings: Mutex::new(Settings::default()),
+        }
+    }
+}
+
+impl ObjectImpl for Queue {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::UInt("max-size-buffers", ..) => {
+            subclass::Property("max-size-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_buffers = value.get().unwrap();
             }
-            Property::UInt("max-size-bytes", ..) => {
+            subclass::Property("max-size-bytes", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_bytes = value.get().unwrap();
             }
-            Property::UInt64("max-size-time", ..) => {
+            subclass::Property("max-size-time", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.max_size_time = value.get().unwrap();
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context = value.get().unwrap_or_else(|| "".into());
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context_wait = value.get().unwrap();
             }
@@ -855,39 +892,47 @@ impl ObjectImpl<Element> for Queue {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::UInt("max-size-buffers", ..) => {
+            subclass::Property("max-size-buffers", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_buffers.to_value())
             }
-            Property::UInt("max-size-bytes", ..) => {
+            subclass::Property("max-size-bytes", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_bytes.to_value())
             }
-            Property::UInt64("max-size-time", ..) => {
+            subclass::Property("max-size-time", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.max_size_time.to_value())
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context.to_value())
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context_wait.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.sink_pad).unwrap();
+        element.add_pad(&self.src_pad).unwrap();
+    }
 }
 
-impl ElementImpl<Element> for Queue {
+impl ElementImpl for Queue {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -911,7 +956,7 @@ impl ElementImpl<Element> for Queue {
             _ => (),
         }
 
-        let ret = element.parent_change_state(transition);
+        let ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -928,24 +973,6 @@ impl ElementImpl<Element> for Queue {
     }
 }
 
-struct QueueStatic;
-
-impl ImplTypeStatic<Element> for QueueStatic {
-    fn get_name(&self) -> &str {
-        "Queue"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        Queue::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        Queue::class_init(klass);
-    }
-}
-
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    let queue_static = QueueStatic;
-    let type_ = register_type(queue_static);
-    gst::Element::register(plugin, "ts-queue", 0, type_)
+    gst::Element::register(plugin, "ts-queue", 0, Queue::get_type())
 }
diff --git a/gst-plugin-threadshare/src/tcpclientsrc.rs b/gst-plugin-threadshare/src/tcpclientsrc.rs
index 212f7a513..0817cbcab 100644
--- a/gst-plugin-threadshare/src/tcpclientsrc.rs
+++ b/gst-plugin-threadshare/src/tcpclientsrc.rs
@@ -18,11 +18,11 @@
 
 use glib;
 use glib::prelude::*;
+use glib::subclass;
+use glib::subclass::prelude::*;
 use gst;
 use gst::prelude::*;
-
-use gobject_subclass::object::*;
-use gst_plugin::element::*;
+use gst::subclass::prelude::*;
 
 use std::io;
 use std::sync::Mutex;
@@ -71,52 +71,67 @@ impl Default for Settings {
     }
 }
 
-static PROPERTIES: [Property; 6] = [
-    Property::String(
-        "address",
-        "Address",
-        "Address to receive packets from",
-        DEFAULT_ADDRESS,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "port",
-        "Port",
-        "Port to receive packets from",
-        (0, u16::MAX as u32),
-        DEFAULT_PORT,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Boxed(
-        "caps",
-        "Caps",
-        "Caps to use",
-        gst::Caps::static_type,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "chunk-size",
-        "Chunk Size",
-        "Chunk Size",
-        (0, u16::MAX as u32),
-        DEFAULT_CHUNK_SIZE,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::String(
-        "context",
-        "Context",
-        "Context name to share threads with",
-        Some(DEFAULT_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "context-wait",
-        "Context Wait",
-        "Throttle poll loop to run at most once every this many ms",
-        (0, 1000),
-        DEFAULT_CONTEXT_WAIT,
-        PropertyMutability::ReadWrite,
-    ),
+static PROPERTIES: [subclass::Property; 6] = [
+    subclass::Property("address", || {
+        glib::ParamSpec::string(
+            "address",
+            "Address",
+            "Address to receive packets from",
+            DEFAULT_ADDRESS,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("port", || {
+        glib::ParamSpec::uint(
+            "port",
+            "Port",
+            "Port to receive packets from",
+            0,
+            u16::MAX as u32,
+            DEFAULT_PORT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("caps", || {
+        glib::ParamSpec::boxed(
+            "caps",
+            "Caps",
+            "Caps to use",
+            gst::Caps::static_type(),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("chunk-size", || {
+        glib::ParamSpec::uint(
+            "chunk-size",
+            "Chunk Size",
+            "Chunk Size",
+            0,
+            u16::MAX as u32,
+            DEFAULT_CHUNK_SIZE,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context", || {
+        glib::ParamSpec::string(
+            "context",
+            "Context",
+            "Context name to share threads with",
+            Some(DEFAULT_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context-wait", || {
+        glib::ParamSpec::uint(
+            "context-wait",
+            "Context Wait",
+            "Throttle poll loop to run at most once every this many ms",
+            0,
+            1000,
+            DEFAULT_CONTEXT_WAIT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
 ];
 
 pub struct TcpClientReader {
@@ -185,61 +200,7 @@ struct TcpClientSrc {
 }
 
 impl TcpClientSrc {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing TCP client source",
-            "Source/Network",
-            "Receives data over the network via TCP",
-            "Sebastian Dröge <sebastian@centricular.com>, LEE Dongjun <redongjun@gmail.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(src_pad_template);
-
-        klass.install_properties(&PROPERTIES);
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("src").unwrap();
-        let src_pad = gst::Pad::new_from_template(&templ, "src");
-
-        src_pad.set_event_function(|pad, parent, event| {
-            TcpClientSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |tcpclientsrc, element| tcpclientsrc.src_event(pad, element, event),
-            )
-        });
-        src_pad.set_query_function(|pad, parent, query| {
-            TcpClientSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |tcpclientsrc, element| tcpclientsrc.src_query(pad, element, query),
-            )
-        });
-        element.add_pad(&src_pad).unwrap();
-
-        ::set_element_flags(element, gst::ElementFlags::SOURCE);
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-tcpclientsrc",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing TCP Client source",
-            ),
-            src_pad: src_pad,
-            state: Mutex::new(State::default()),
-            settings: Mutex::new(Settings::default()),
-        })
-    }
-
-    fn src_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -271,7 +232,12 @@ impl TcpClientSrc {
         ret
     }
 
-    fn src_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn src_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         use gst::QueryView;
 
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
@@ -331,7 +297,7 @@ impl TcpClientSrc {
 
     fn push_buffer(
         &self,
-        element: &Element,
+        element: &gst::Element,
         buffer: gst::Buffer,
     ) -> future::Either<
         Box<Future<Item = (), Error = gst::FlowError> + Send + 'static>,
@@ -431,7 +397,7 @@ impl TcpClientSrc {
         }
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         use std::net::{IpAddr, SocketAddr};
 
         gst_debug!(self.cat, obj: element, "Preparing");
@@ -493,17 +459,11 @@ impl TcpClientSrc {
             .schedule(
                 &io_context,
                 move |buffer| {
-                    let tcpclientsrc = element_clone
-                        .get_impl()
-                        .downcast_ref::<TcpClientSrc>()
-                        .unwrap();
+                    let tcpclientsrc = Self::from_instance(&element_clone);
                     tcpclientsrc.push_buffer(&element_clone, buffer)
                 },
                 move |err| {
-                    let tcpclientsrc = element_clone2
-                        .get_impl()
-                        .downcast_ref::<TcpClientSrc>()
-                        .unwrap();
+                    let tcpclientsrc = Self::from_instance(&element_clone2);
                     gst_error!(tcpclientsrc.cat, obj: &element_clone2, "Got error {}", err);
                     match err {
                         Either::Left(gst::FlowError::CustomError) => (),
@@ -547,7 +507,7 @@ impl TcpClientSrc {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         // FIXME: The IO Context has to be alive longer than the queue,
@@ -576,7 +536,7 @@ impl TcpClientSrc {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let state = self.state.lock().unwrap();
 
@@ -589,7 +549,7 @@ impl TcpClientSrc {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let mut state = self.state.lock().unwrap();
 
@@ -604,32 +564,98 @@ impl TcpClientSrc {
     }
 }
 
-impl ObjectImpl<Element> for TcpClientSrc {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES[id as usize];
+impl ObjectSubclass for TcpClientSrc {
+    const NAME: &'static str = "RsTsTcpClientSrc";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing TCP client source",
+            "Source/Network",
+            "Receives data over the network via TCP",
+            "Sebastian Dröge <sebastian@centricular.com>, LEE Dongjun <redongjun@gmail.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+        let src_pad_template = gst::PadTemplate::new(
+            "src",
+            gst::PadDirection::Src,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES);
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("src").unwrap();
+        let src_pad = gst::Pad::new_from_template(&templ, "src");
+
+        src_pad.set_event_function(|pad, parent, event| {
+            TcpClientSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |tcpclientsrc, element| tcpclientsrc.src_event(pad, element, event),
+            )
+        });
+        src_pad.set_query_function(|pad, parent, query| {
+            TcpClientSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |tcpclientsrc, element| tcpclientsrc.src_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-tcpclientsrc",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing TCP Client source",
+            ),
+            src_pad: src_pad,
+            state: Mutex::new(State::default()),
+            settings: Mutex::new(Settings::default()),
+        }
+    }
+}
+
+impl ObjectImpl for TcpClientSrc {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("address", ..) => {
+            subclass::Property("address", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.address = value.get();
             }
-            Property::UInt("port", ..) => {
+            subclass::Property("port", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.port = value.get().unwrap();
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.caps = value.get();
             }
-            Property::UInt("chunk-size", ..) => {
+            subclass::Property("chunk-size", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.chunk_size = value.get().unwrap();
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context = value.get().unwrap_or_else(|| "".into());
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context_wait = value.get().unwrap();
             }
@@ -637,43 +663,52 @@ impl ObjectImpl<Element> for TcpClientSrc {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("address", ..) => {
+            subclass::Property("address", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.address.to_value())
             }
-            Property::UInt("port", ..) => {
+            subclass::Property("port", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.port.to_value())
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.caps.to_value())
             }
-            Property::UInt("chunk-size", ..) => {
+            subclass::Property("chunk-size", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.chunk_size.to_value())
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context.to_value())
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context_wait.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.src_pad).unwrap();
+
+        ::set_element_flags(element, gst::ElementFlags::SOURCE);
+    }
 }
 
-impl ElementImpl<Element> for TcpClientSrc {
+impl ElementImpl for TcpClientSrc {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -699,7 +734,7 @@ impl ElementImpl<Element> for TcpClientSrc {
             _ => (),
         }
 
-        let mut ret = element.parent_change_state(transition);
+        let mut ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -719,24 +754,6 @@ impl ElementImpl<Element> for TcpClientSrc {
     }
 }
 
-struct TcpClientSrcStatic;
-
-impl ImplTypeStatic<Element> for TcpClientSrcStatic {
-    fn get_name(&self) -> &str {
-        "TcpClientSrc"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        TcpClientSrc::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        TcpClientSrc::class_init(klass);
-    }
-}
-
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    let tcpclientsrc_static = TcpClientSrcStatic;
-    let type_ = register_type(tcpclientsrc_static);
-    gst::Element::register(plugin, "ts-tcpclientsrc", 0, type_)
+    gst::Element::register(plugin, "ts-tcpclientsrc", 0, TcpClientSrc::get_type())
 }
diff --git a/gst-plugin-threadshare/src/udpsrc.rs b/gst-plugin-threadshare/src/udpsrc.rs
index 884e98571..596da6b2d 100644
--- a/gst-plugin-threadshare/src/udpsrc.rs
+++ b/gst-plugin-threadshare/src/udpsrc.rs
@@ -17,17 +17,17 @@
 
 use glib;
 use glib::prelude::*;
+use glib::subclass;
+use glib::subclass::prelude::*;
 use gst;
 use gst::prelude::*;
+use gst::subclass::prelude::*;
 
 use gio;
 
 use gio_ffi;
 use gobject_ffi;
 
-use gobject_subclass::object::*;
-use gst_plugin::element::*;
-
 use std::io;
 use std::sync::Mutex;
 use std::u16;
@@ -179,73 +179,94 @@ impl Default for Settings {
     }
 }
 
-static PROPERTIES: [Property; 9] = [
-    Property::String(
-        "address",
-        "Address",
-        "Address/multicast group to listen on",
-        DEFAULT_ADDRESS,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "port",
-        "Port",
-        "Port to listen on",
-        (0, u16::MAX as u32),
-        DEFAULT_PORT,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Boolean(
-        "reuse",
-        "Reuse",
-        "Allow reuse of the port",
-        DEFAULT_REUSE,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Boxed(
-        "caps",
-        "Caps",
-        "Caps to use",
-        gst::Caps::static_type,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "mtu",
-        "MTU",
-        "MTU",
-        (0, u16::MAX as u32),
-        DEFAULT_MTU,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Object(
-        "socket",
-        "Socket",
-        "Socket to use for UDP reception. (None == allocate)",
-        gio::Socket::static_type,
-        PropertyMutability::ReadWrite,
-    ),
-    Property::Object(
-        "used-socket",
-        "Used Socket",
-        "Socket currently in use for UDP reception. (None = no socket)",
-        gio::Socket::static_type,
-        PropertyMutability::Readable,
-    ),
-    Property::String(
-        "context",
-        "Context",
-        "Context name to share threads with",
-        Some(DEFAULT_CONTEXT),
-        PropertyMutability::ReadWrite,
-    ),
-    Property::UInt(
-        "context-wait",
-        "Context Wait",
-        "Throttle poll loop to run at most once every this many ms",
-        (0, 1000),
-        DEFAULT_CONTEXT_WAIT,
-        PropertyMutability::ReadWrite,
-    ),
+static PROPERTIES: [subclass::Property; 9] = [
+    subclass::Property("address", || {
+        glib::ParamSpec::string(
+            "address",
+            "Address",
+            "Address/multicast group to listen on",
+            DEFAULT_ADDRESS,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("port", || {
+        glib::ParamSpec::uint(
+            "port",
+            "Port",
+            "Port to listen on",
+            0,
+            u16::MAX as u32,
+            DEFAULT_PORT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("reuse", || {
+        glib::ParamSpec::boolean(
+            "reuse",
+            "Reuse",
+            "Allow reuse of the port",
+            DEFAULT_REUSE,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("caps", || {
+        glib::ParamSpec::boxed(
+            "caps",
+            "Caps",
+            "Caps to use",
+            gst::Caps::static_type(),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("mtu", || {
+        glib::ParamSpec::uint(
+            "mtu",
+            "MTU",
+            "MTU",
+            0,
+            u16::MAX as u32,
+            DEFAULT_MTU,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("socket", || {
+        glib::ParamSpec::object(
+            "socket",
+            "Socket",
+            "Socket to use for UDP reception. (None == allocate)",
+            gio::Socket::static_type(),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("used-socket", || {
+        glib::ParamSpec::object(
+            "used-socket",
+            "Used Socket",
+            "Socket currently in use for UDP reception. (None = no socket)",
+            gio::Socket::static_type(),
+            glib::ParamFlags::READABLE,
+        )
+    }),
+    subclass::Property("context", || {
+        glib::ParamSpec::string(
+            "context",
+            "Context",
+            "Context name to share threads with",
+            Some(DEFAULT_CONTEXT),
+            glib::ParamFlags::READWRITE,
+        )
+    }),
+    subclass::Property("context-wait", || {
+        glib::ParamSpec::uint(
+            "context-wait",
+            "Context Wait",
+            "Throttle poll loop to run at most once every this many ms",
+            0,
+            1000,
+            DEFAULT_CONTEXT_WAIT,
+            glib::ParamFlags::READWRITE,
+        )
+    }),
 ];
 
 pub struct UdpReader {
@@ -296,61 +317,7 @@ struct UdpSrc {
 }
 
 impl UdpSrc {
-    fn class_init(klass: &mut ElementClass) {
-        klass.set_metadata(
-            "Thread-sharing UDP source",
-            "Source/Network",
-            "Receives data over the network via UDP",
-            "Sebastian Dröge <sebastian@centricular.com>",
-        );
-
-        let caps = gst::Caps::new_any();
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &caps,
-        );
-        klass.add_pad_template(src_pad_template);
-
-        klass.install_properties(&PROPERTIES);
-    }
-
-    fn init(element: &Element) -> Box<ElementImpl<Element>> {
-        let templ = element.get_pad_template("src").unwrap();
-        let src_pad = gst::Pad::new_from_template(&templ, "src");
-
-        src_pad.set_event_function(|pad, parent, event| {
-            UdpSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |udpsrc, element| udpsrc.src_event(pad, element, event),
-            )
-        });
-        src_pad.set_query_function(|pad, parent, query| {
-            UdpSrc::catch_panic_pad_function(
-                parent,
-                || false,
-                |udpsrc, element| udpsrc.src_query(pad, element, query),
-            )
-        });
-        element.add_pad(&src_pad).unwrap();
-
-        ::set_element_flags(element, gst::ElementFlags::SOURCE);
-
-        Box::new(Self {
-            cat: gst::DebugCategory::new(
-                "ts-udpsrc",
-                gst::DebugColorFlags::empty(),
-                "Thread-sharing UDP source",
-            ),
-            src_pad: src_pad,
-            state: Mutex::new(State::default()),
-            settings: Mutex::new(Settings::default()),
-        })
-    }
-
-    fn src_event(&self, pad: &gst::Pad, element: &Element, event: gst::Event) -> bool {
+    fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
         use gst::EventView;
 
         gst_log!(self.cat, obj: pad, "Handling event {:?}", event);
@@ -382,7 +349,12 @@ impl UdpSrc {
         ret
     }
 
-    fn src_query(&self, pad: &gst::Pad, _element: &Element, query: &mut gst::QueryRef) -> bool {
+    fn src_query(
+        &self,
+        pad: &gst::Pad,
+        _element: &gst::Element,
+        query: &mut gst::QueryRef,
+    ) -> bool {
         use gst::QueryView;
 
         gst_log!(self.cat, obj: pad, "Handling query {:?}", query);
@@ -442,7 +414,7 @@ impl UdpSrc {
 
     fn push_buffer(
         &self,
-        element: &Element,
+        element: &gst::Element,
         buffer: gst::Buffer,
     ) -> future::Either<
         Box<Future<Item = (), Error = gst::FlowError> + Send + 'static>,
@@ -537,7 +509,7 @@ impl UdpSrc {
         }
     }
 
-    fn prepare(&self, element: &Element) -> Result<(), gst::ErrorMessage> {
+    fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
         use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
 
         gst_debug!(self.cat, obj: element, "Preparing");
@@ -768,11 +740,11 @@ impl UdpSrc {
             .schedule(
                 &io_context,
                 move |buffer| {
-                    let udpsrc = element_clone.get_impl().downcast_ref::<UdpSrc>().unwrap();
+                    let udpsrc = Self::from_instance(&element_clone);
                     udpsrc.push_buffer(&element_clone, buffer)
                 },
                 move |err| {
-                    let udpsrc = element_clone2.get_impl().downcast_ref::<UdpSrc>().unwrap();
+                    let udpsrc = Self::from_instance(&element_clone2);
                     gst_error!(udpsrc.cat, obj: &element_clone2, "Got error {}", err);
                     match err {
                         Either::Left(gst::FlowError::CustomError) => (),
@@ -819,7 +791,7 @@ impl UdpSrc {
         Ok(())
     }
 
-    fn unprepare(&self, element: &Element) -> Result<(), ()> {
+    fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Unpreparing");
 
         self.settings.lock().unwrap().used_socket = None;
@@ -850,7 +822,7 @@ impl UdpSrc {
         Ok(())
     }
 
-    fn start(&self, element: &Element) -> Result<(), ()> {
+    fn start(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Starting");
         let state = self.state.lock().unwrap();
 
@@ -863,7 +835,7 @@ impl UdpSrc {
         Ok(())
     }
 
-    fn stop(&self, element: &Element) -> Result<(), ()> {
+    fn stop(&self, element: &gst::Element) -> Result<(), ()> {
         gst_debug!(self.cat, obj: element, "Stopping");
         let mut state = self.state.lock().unwrap();
 
@@ -878,45 +850,111 @@ impl UdpSrc {
     }
 }
 
-impl ObjectImpl<Element> for UdpSrc {
-    fn set_property(&self, _obj: &glib::Object, id: u32, value: &glib::Value) {
-        let prop = &PROPERTIES[id as usize];
+impl ObjectSubclass for UdpSrc {
+    const NAME: &'static str = "RsTsUdpSrc";
+    type ParentType = gst::Element;
+    type Instance = gst::subclass::ElementInstanceStruct<Self>;
+    type Class = subclass::simple::ClassStruct<Self>;
+
+    glib_object_subclass!();
+
+    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
+        klass.set_metadata(
+            "Thread-sharing UDP source",
+            "Source/Network",
+            "Receives data over the network via UDP",
+            "Sebastian Dröge <sebastian@centricular.com>",
+        );
+
+        let caps = gst::Caps::new_any();
+        let src_pad_template = gst::PadTemplate::new(
+            "src",
+            gst::PadDirection::Src,
+            gst::PadPresence::Always,
+            &caps,
+        );
+        klass.add_pad_template(src_pad_template);
+
+        klass.install_properties(&PROPERTIES);
+    }
+
+    fn new() -> Self {
+        unreachable!()
+    }
+
+    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
+        let templ = klass.get_pad_template("src").unwrap();
+        let src_pad = gst::Pad::new_from_template(&templ, "src");
+
+        src_pad.set_event_function(|pad, parent, event| {
+            UdpSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |udpsrc, element| udpsrc.src_event(pad, element, event),
+            )
+        });
+        src_pad.set_query_function(|pad, parent, query| {
+            UdpSrc::catch_panic_pad_function(
+                parent,
+                || false,
+                |udpsrc, element| udpsrc.src_query(pad, element, query),
+            )
+        });
+
+        Self {
+            cat: gst::DebugCategory::new(
+                "ts-udpsrc",
+                gst::DebugColorFlags::empty(),
+                "Thread-sharing UDP source",
+            ),
+            src_pad: src_pad,
+            state: Mutex::new(State::default()),
+            settings: Mutex::new(Settings::default()),
+        }
+    }
+}
+
+impl ObjectImpl for UdpSrc {
+    glib_object_impl!();
+
+    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("address", ..) => {
+            subclass::Property("address", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.address = value.get();
             }
-            Property::UInt("port", ..) => {
+            subclass::Property("port", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.port = value.get().unwrap();
             }
-            Property::Boolean("reuse", ..) => {
+            subclass::Property("reuse", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.reuse = value.get().unwrap();
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.caps = value.get();
             }
-            Property::UInt("mtu", ..) => {
+            subclass::Property("mtu", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.mtu = value.get().unwrap();
             }
-            Property::Object("socket", ..) => {
+            subclass::Property("socket", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.socket = value
                     .get::<gio::Socket>()
                     .map(|socket| GioSocketWrapper::new(&socket));
             }
-            Property::Object("used-socket", ..) => {
+            subclass::Property("used-socket", ..) => {
                 unreachable!();
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context = value.get().unwrap_or_else(|| "".into());
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 settings.context_wait = value.get().unwrap();
             }
@@ -924,31 +962,31 @@ impl ObjectImpl<Element> for UdpSrc {
         }
     }
 
-    fn get_property(&self, _obj: &glib::Object, id: u32) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES[id as usize];
+    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
+        let prop = &PROPERTIES[id];
 
         match *prop {
-            Property::String("address", ..) => {
+            subclass::Property("address", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.address.to_value())
             }
-            Property::UInt("port", ..) => {
+            subclass::Property("port", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.port.to_value())
             }
-            Property::Boolean("reuse", ..) => {
+            subclass::Property("reuse", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.reuse.to_value())
             }
-            Property::Boxed("caps", ..) => {
+            subclass::Property("caps", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.caps.to_value())
             }
-            Property::UInt("mtu", ..) => {
+            subclass::Property("mtu", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.mtu.to_value())
             }
-            Property::Object("socket", ..) => {
+            subclass::Property("socket", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings
                     .socket
@@ -956,7 +994,7 @@ impl ObjectImpl<Element> for UdpSrc {
                     .map(GioSocketWrapper::as_socket)
                     .to_value())
             }
-            Property::Object("used-socket", ..) => {
+            subclass::Property("used-socket", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings
                     .used_socket
@@ -964,23 +1002,31 @@ impl ObjectImpl<Element> for UdpSrc {
                     .map(GioSocketWrapper::as_socket)
                     .to_value())
             }
-            Property::String("context", ..) => {
+            subclass::Property("context", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context.to_value())
             }
-            Property::UInt("context-wait", ..) => {
+            subclass::Property("context-wait", ..) => {
                 let mut settings = self.settings.lock().unwrap();
                 Ok(settings.context_wait.to_value())
             }
             _ => unimplemented!(),
         }
     }
+
+    fn constructed(&self, obj: &glib::Object) {
+        self.parent_constructed(obj);
+
+        let element = obj.downcast_ref::<gst::Element>().unwrap();
+        element.add_pad(&self.src_pad).unwrap();
+        ::set_element_flags(element, gst::ElementFlags::SOURCE);
+    }
 }
 
-impl ElementImpl<Element> for UdpSrc {
+impl ElementImpl for UdpSrc {
     fn change_state(
         &self,
-        element: &Element,
+        element: &gst::Element,
         transition: gst::StateChange,
     ) -> gst::StateChangeReturn {
         gst_trace!(self.cat, obj: element, "Changing state {:?}", transition);
@@ -1004,7 +1050,7 @@ impl ElementImpl<Element> for UdpSrc {
             _ => (),
         }
 
-        let mut ret = element.parent_change_state(transition);
+        let mut ret = self.parent_change_state(element, transition);
         if ret == gst::StateChangeReturn::Failure {
             return ret;
         }
@@ -1028,24 +1074,6 @@ impl ElementImpl<Element> for UdpSrc {
     }
 }
 
-struct UdpSrcStatic;
-
-impl ImplTypeStatic<Element> for UdpSrcStatic {
-    fn get_name(&self) -> &str {
-        "UdpSrc"
-    }
-
-    fn new(&self, element: &Element) -> Box<ElementImpl<Element>> {
-        UdpSrc::init(element)
-    }
-
-    fn class_init(&self, klass: &mut ElementClass) {
-        UdpSrc::class_init(klass);
-    }
-}
-
 pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    let udpsrc_static = UdpSrcStatic;
-    let type_ = register_type(udpsrc_static);
-    gst::Element::register(plugin, "ts-udpsrc", 0, type_)
+    gst::Element::register(plugin, "ts-udpsrc", 0, UdpSrc::get_type())
 }