diff --git a/gstreamer-base/src/base_sink.rs b/gstreamer-base/src/base_sink.rs
new file mode 100644
index 000000000..661e5fb2d
--- /dev/null
+++ b/gstreamer-base/src/base_sink.rs
@@ -0,0 +1,28 @@
+// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use ffi;
+use glib::IsA;
+use glib::translate::*;
+use gst;
+use BaseSink;
+
+pub trait BaseSinkExtManual {
+    fn get_segment(&self) -> gst::Segment;
+}
+
+impl<O: IsA<BaseSink>> BaseSinkExtManual for O {
+    fn get_segment(&self) -> gst::Segment {
+        unsafe {
+            let stash = self.to_glib_none();
+            let sink: &ffi::GstBaseSink = &*stash.0;
+            ::utils::MutexGuard::lock(&sink.element.object.lock);
+            from_glib_none(&sink.segment as *const _)
+        }
+    }
+}
diff --git a/gstreamer-base/src/base_src.rs b/gstreamer-base/src/base_src.rs
new file mode 100644
index 000000000..17640cefc
--- /dev/null
+++ b/gstreamer-base/src/base_src.rs
@@ -0,0 +1,28 @@
+// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use ffi;
+use glib::IsA;
+use glib::translate::*;
+use gst;
+use BaseSrc;
+
+pub trait BaseSrcExtManual {
+    fn get_segment(&self) -> gst::Segment;
+}
+
+impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
+    fn get_segment(&self) -> gst::Segment {
+        unsafe {
+            let stash = self.to_glib_none();
+            let src: &ffi::GstBaseSrc = &*stash.0;
+            ::utils::MutexGuard::lock(&src.element.object.lock);
+            from_glib_none(&src.segment as *const _)
+        }
+    }
+}
diff --git a/gstreamer-base/src/base_transform.rs b/gstreamer-base/src/base_transform.rs
new file mode 100644
index 000000000..361f7dc39
--- /dev/null
+++ b/gstreamer-base/src/base_transform.rs
@@ -0,0 +1,28 @@
+// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use ffi;
+use glib::IsA;
+use glib::translate::*;
+use gst;
+use BaseTransform;
+
+pub trait BaseTransformExtManual {
+    fn get_segment(&self) -> gst::Segment;
+}
+
+impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {
+    fn get_segment(&self) -> gst::Segment {
+        unsafe {
+            let stash = self.to_glib_none();
+            let trans: &ffi::GstBaseTransform = &*stash.0;
+            ::utils::MutexGuard::lock(&trans.element.object.lock);
+            from_glib_none(&trans.segment as *const _)
+        }
+    }
+}
diff --git a/gstreamer-base/src/lib.rs b/gstreamer-base/src/lib.rs
index 5e0318392..8cd32f656 100644
--- a/gstreamer-base/src/lib.rs
+++ b/gstreamer-base/src/lib.rs
@@ -45,6 +45,9 @@ pub use functions::*;
 mod adapter;
 mod flow_combiner;
 pub use flow_combiner::*;
+mod base_src;
+mod base_sink;
+mod base_transform;
 
 // Re-export all the traits in a prelude module, so that applications
 // can always "use gst::prelude::*" without getting conflicts
@@ -53,4 +56,9 @@ pub mod prelude {
     pub use gst::prelude::*;
 
     pub use auto::traits::*;
+    pub use base_src::BaseSrcExtManual;
+    pub use base_sink::BaseSinkExtManual;
+    pub use base_transform::BaseTransformExtManual;
 }
+
+mod utils;
diff --git a/gstreamer-base/src/utils.rs b/gstreamer-base/src/utils.rs
new file mode 100644
index 000000000..f4b3a292d
--- /dev/null
+++ b/gstreamer-base/src/utils.rs
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use glib::translate::mut_override;
+use glib_ffi;
+
+pub struct MutexGuard<'a>(&'a glib_ffi::GMutex);
+
+impl<'a> MutexGuard<'a> {
+    pub fn lock(mutex: &'a glib_ffi::GMutex) -> Self {
+        unsafe {
+            glib_ffi::g_mutex_lock(mut_override(mutex));
+        }
+        MutexGuard(mutex)
+    }
+}
+
+impl<'a> Drop for MutexGuard<'a> {
+    fn drop(&mut self) {
+        unsafe {
+            glib_ffi::g_mutex_unlock(mut_override(self.0));
+        }
+    }
+}