diff --git a/Gir_GstGL.toml b/Gir_GstGL.toml
index f99325414..896f31b08 100644
--- a/Gir_GstGL.toml
+++ b/Gir_GstGL.toml
@@ -152,6 +152,10 @@ status = "generate"
        [object.function.return]
        nullable = false
 
+    [[object.function]]
+    name = "set_window"
+        [object.function.return]
+        bool_return_is_error = "Failed to set window"
 
 [[object]]
 name = "GstGL.GLDisplay"
@@ -217,6 +221,11 @@ status = "generate"
     # callback
     ignore = true
 
+    [[object.function]]
+    name = "set_render_rectangle"
+        [object.function.return]
+        bool_return_is_error = "Failed to set the specified region"
+
     [[object.function]]
     name = "set_resize_callback"
     # callback
@@ -242,6 +251,11 @@ name = "GstGL.GLColorConvert"
 status = "generate"
 final_type = true
 
+    [[object.function]]
+    name = "set_caps"
+        [object.function.return]
+        bool_return_is_error = "Failed to set caps"
+
     [[object.function]]
     name = "decide_allocation"
     # correct mutability
@@ -272,11 +286,26 @@ name = "GstGL.GLSLStage"
 status = "generate"
 final_type = true
 
+    [[object.function]]
+    name = "set_strings"
+        [object.function.return]
+        bool_return_is_error = "Failed to attach stage to set strings"
+
 [[object]]
 name = "GstGL.GLShader"
 status = "generate"
 final_type = true
 
+    [[object.function]]
+    name = "attach"
+        [object.function.return]
+        bool_return_is_error = "Failed to attach stage to shader"
+
+    [[object.function]]
+    name = "attach_unlocked"
+        [object.function.return]
+        bool_return_is_error = "Failed to attach stage to shader"
+
     [[object.function]]
     name = "set_uniform_matrix_2fv"
     # array with size
@@ -327,6 +356,11 @@ name = "GstGL.GLUpload"
 status = "generate"
 final_type = true
 
+    [[object.function]]
+    name = "set_caps"
+        [object.function.return]
+        bool_return_is_error = "Failed to set caps"
+
     [[object.function]]
     name = "perform_with_buffer"
     # Result<Buffer, GLUploadReturn>
@@ -347,6 +381,11 @@ name = "GstGL.GLViewConvert"
 status = "generate"
 final_type = true
 
+    [[object.function]]
+    name = "set_caps"
+        [object.function.return]
+        bool_return_is_error = "Failed to set caps"
+
     [[object.function]]
     name = "fixate_caps"
     # correct reference ownership
diff --git a/Gir_GstRtspServer.toml b/Gir_GstRtspServer.toml
index 6a0717a4c..4e048ccdb 100644
--- a/Gir_GstRtspServer.toml
+++ b/Gir_GstRtspServer.toml
@@ -110,6 +110,16 @@ status = "generate"
     name = "attach"
     ignore = true
 
+    [[object.function]]
+    name = "io_func"
+        [object.function.return]
+        bool_return_is_error = "Failed to connect the source"
+
+    [[object.function]]
+    name = "transfer_connection"
+        [object.function.return]
+        bool_return_is_error = "Failed to transfer to the connection"
+
 [[object]]
 name = "GstRtspServer.RTSPClient"
 status = "generate"
@@ -160,6 +170,21 @@ status = "generate"
         [object.function.return]
         bool_return_is_error = "Failed to leave bin"
 
+    [[object.function]]
+    name = "set_blocked"
+        [object.function.return]
+        bool_return_is_error = "Failed to block/unblock the dataflow"
+
+    [[object.function]]
+    name = "unblock_linked"
+        [object.function.return]
+        bool_return_is_error = "Failed to unblock the dataflow"
+
+    [[object.function]]
+    name = "update_crypto"
+        [object.function.return]
+        bool_return_is_error = "Failed to update crypto"
+
 [[object]]
 name = "GstRtspServer.RTSPAddress"
 status = "generate"
@@ -258,6 +283,16 @@ status = "generate"
 name="GstRtspServer.RTSPAuth"
 status="generate"
 
+    [[object.function]]
+    name = "check"
+        [object.function.return]
+        bool_return_is_error = "Check failed"
+
+    [[object.function]]
+    name = "connect_accept_certificate"
+    # Use Result<(), LoggableError>
+    ignore = true
+
     [[object.function]]
     name = "make_basic"
         [object.function.return]
diff --git a/gstreamer-check/src/auto/test_clock.rs b/gstreamer-check/src/auto/test_clock.rs
index a28edafc5..c69a90df9 100644
--- a/gstreamer-check/src/auto/test_clock.rs
+++ b/gstreamer-check/src/auto/test_clock.rs
@@ -45,9 +45,12 @@ impl TestClock {
         }
     }
 
-    pub fn crank(&self) -> bool {
+    pub fn crank(&self) -> Result<(), glib::BoolError> {
         unsafe {
-            from_glib(ffi::gst_test_clock_crank(self.to_glib_none().0))
+            glib_result_from_gboolean!(
+                ffi::gst_test_clock_crank(self.to_glib_none().0),
+                "Failed to crank"
+            )
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_color_convert.rs b/gstreamer-gl/src/auto/gl_color_convert.rs
index 9a8f4875c..292aaccbd 100644
--- a/gstreamer-gl/src/auto/gl_color_convert.rs
+++ b/gstreamer-gl/src/auto/gl_color_convert.rs
@@ -4,6 +4,7 @@
 
 use GLContext;
 use ffi;
+use glib;
 use glib::object::IsA;
 use glib::translate::*;
 use gst;
@@ -24,9 +25,9 @@ impl GLColorConvert {
         }
     }
 
-    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> bool {
+    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_color_convert_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_gl_color_convert_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0), "Failed to set caps")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_context.rs b/gstreamer-gl/src/auto/gl_context.rs
index 326e8226a..b65f66250 100644
--- a/gstreamer-gl/src/auto/gl_context.rs
+++ b/gstreamer-gl/src/auto/gl_context.rs
@@ -93,7 +93,7 @@ pub trait GLContextExt: 'static {
 
     fn set_shared_with<P: IsA<GLContext>>(&self, share: &P);
 
-    fn set_window<P: IsA<GLWindow>>(&self, window: &P) -> bool;
+    fn set_window<P: IsA<GLWindow>>(&self, window: &P) -> Result<(), glib::error::BoolError>;
 
     fn supports_glsl_profile_version(&self, version: GLSLVersion, profile: GLSLProfile) -> bool;
 
@@ -220,9 +220,9 @@ impl<O: IsA<GLContext>> GLContextExt for O {
         }
     }
 
-    fn set_window<P: IsA<GLWindow>>(&self, window: &P) -> bool {
+    fn set_window<P: IsA<GLWindow>>(&self, window: &P) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_context_set_window(self.as_ref().to_glib_none().0, window.as_ref().to_glib_full()))
+            glib_result_from_gboolean!(ffi::gst_gl_context_set_window(self.as_ref().to_glib_none().0, window.as_ref().to_glib_full()), "Failed to set window")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_shader.rs b/gstreamer-gl/src/auto/gl_shader.rs
index 4b8a5bd51..422ddf453 100644
--- a/gstreamer-gl/src/auto/gl_shader.rs
+++ b/gstreamer-gl/src/auto/gl_shader.rs
@@ -6,6 +6,7 @@ use Error;
 use GLContext;
 use GLSLStage;
 use ffi;
+use glib;
 use glib::StaticType;
 use glib::Value;
 use glib::object::IsA;
@@ -53,15 +54,15 @@ impl GLShader {
     //    unsafe { TODO: call ffi::gst_gl_shader_new_with_stages() }
     //}
 
-    pub fn attach(&self, stage: &GLSLStage) -> bool {
+    pub fn attach(&self, stage: &GLSLStage) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_shader_attach(self.to_glib_none().0, stage.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_gl_shader_attach(self.to_glib_none().0, stage.to_glib_none().0), "Failed to attach stage to shader")
         }
     }
 
-    pub fn attach_unlocked(&self, stage: &GLSLStage) -> bool {
+    pub fn attach_unlocked(&self, stage: &GLSLStage) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_shader_attach_unlocked(self.to_glib_none().0, stage.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_gl_shader_attach_unlocked(self.to_glib_none().0, stage.to_glib_none().0), "Failed to attach stage to shader")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_upload.rs b/gstreamer-gl/src/auto/gl_upload.rs
index f1714d5f7..faa54a42c 100644
--- a/gstreamer-gl/src/auto/gl_upload.rs
+++ b/gstreamer-gl/src/auto/gl_upload.rs
@@ -4,6 +4,7 @@
 
 use GLContext;
 use ffi;
+use glib;
 use glib::object::IsA;
 use glib::translate::*;
 use gst;
@@ -34,9 +35,9 @@ impl GLUpload {
         }
     }
 
-    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> bool {
+    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_upload_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_gl_upload_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0), "Failed to set caps")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_view_convert.rs b/gstreamer-gl/src/auto/gl_view_convert.rs
index c96124ba7..5532683f8 100644
--- a/gstreamer-gl/src/auto/gl_view_convert.rs
+++ b/gstreamer-gl/src/auto/gl_view_convert.rs
@@ -5,6 +5,7 @@
 use GLContext;
 use GLStereoDownmix;
 use ffi;
+use glib;
 use glib::StaticType;
 use glib::Value;
 use glib::object::IsA;
@@ -47,9 +48,9 @@ impl GLViewConvert {
         }
     }
 
-    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> bool {
+    pub fn set_caps(&self, in_caps: &gst::Caps, out_caps: &gst::Caps) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_view_convert_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_gl_view_convert_set_caps(self.to_glib_none().0, in_caps.to_glib_none().0, out_caps.to_glib_none().0), "Failed to set caps")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/gl_window.rs b/gstreamer-gl/src/auto/gl_window.rs
index 182174e81..25ab4a1f9 100644
--- a/gstreamer-gl/src/auto/gl_window.rs
+++ b/gstreamer-gl/src/auto/gl_window.rs
@@ -5,6 +5,7 @@
 use GLContext;
 use GLDisplay;
 use ffi;
+use glib;
 use glib::GString;
 use glib::object::Cast;
 use glib::object::IsA;
@@ -63,7 +64,7 @@ pub trait GLWindowExt: 'static {
 
     fn set_preferred_size(&self, width: i32, height: i32);
 
-    fn set_render_rectangle(&self, x: i32, y: i32, width: i32, height: i32) -> bool;
+    fn set_render_rectangle(&self, x: i32, y: i32, width: i32, height: i32) -> Result<(), glib::error::BoolError>;
 
     fn show(&self);
 
@@ -142,9 +143,9 @@ impl<O: IsA<GLWindow>> GLWindowExt for O {
         }
     }
 
-    fn set_render_rectangle(&self, x: i32, y: i32, width: i32, height: i32) -> bool {
+    fn set_render_rectangle(&self, x: i32, y: i32, width: i32, height: i32) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_gl_window_set_render_rectangle(self.as_ref().to_glib_none().0, x, y, width, height))
+            glib_result_from_gboolean!(ffi::gst_gl_window_set_render_rectangle(self.as_ref().to_glib_none().0, x, y, width, height), "Failed to set the specified region")
         }
     }
 
diff --git a/gstreamer-gl/src/auto/glsl_stage.rs b/gstreamer-gl/src/auto/glsl_stage.rs
index 8cb41433b..e33589083 100644
--- a/gstreamer-gl/src/auto/glsl_stage.rs
+++ b/gstreamer-gl/src/auto/glsl_stage.rs
@@ -7,6 +7,7 @@ use GLContext;
 use GLSLProfile;
 use GLSLVersion;
 use ffi;
+use glib;
 use glib::GString;
 use glib::object::IsA;
 use glib::translate::*;
@@ -90,10 +91,10 @@ impl GLSLStage {
         }
     }
 
-    pub fn set_strings(&self, version: GLSLVersion, profile: GLSLProfile, str: &[&str]) -> bool {
+    pub fn set_strings(&self, version: GLSLVersion, profile: GLSLProfile, str: &[&str]) -> Result<(), glib::error::BoolError> {
         let n_strings = str.len() as i32;
         unsafe {
-            from_glib(ffi::gst_glsl_stage_set_strings(self.to_glib_none().0, version.to_glib(), profile.to_glib(), n_strings, str.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_glsl_stage_set_strings(self.to_glib_none().0, version.to_glib(), profile.to_glib(), n_strings, str.to_glib_none().0), "Failed to attach stage to set strings")
         }
     }
 }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_auth.rs b/gstreamer-rtsp-server/src/auto/rtsp_auth.rs
index 39f3f328d..bc7aef5c9 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_auth.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_auth.rs
@@ -6,6 +6,7 @@ use RTSPToken;
 use ffi;
 use gio;
 use gio_ffi;
+use glib;
 use glib::GString;
 use glib::object::Cast;
 use glib::object::IsA;
@@ -34,10 +35,10 @@ impl RTSPAuth {
         }
     }
 
-    pub fn check(check: &str) -> bool {
+    pub fn check(check: &str) -> Result<(), glib::error::BoolError> {
         assert_initialized_main_thread!();
         unsafe {
-            from_glib(ffi::gst_rtsp_auth_check(check.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_rtsp_auth_check(check.to_glib_none().0), "Check failed")
         }
     }
 
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_server.rs b/gstreamer-rtsp-server/src/auto/rtsp_server.rs
index 03a491282..a0fed793b 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_server.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_server.rs
@@ -38,10 +38,10 @@ impl RTSPServer {
         }
     }
 
-    pub fn io_func<P: IsA<gio::Socket>, Q: IsA<RTSPServer>>(socket: &P, condition: glib::IOCondition, server: &Q) -> bool {
+    pub fn io_func<P: IsA<gio::Socket>, Q: IsA<RTSPServer>>(socket: &P, condition: glib::IOCondition, server: &Q) -> Result<(), glib::error::BoolError> {
         skip_assert_initialized!();
         unsafe {
-            from_glib(ffi::gst_rtsp_server_io_func(socket.as_ref().to_glib_none().0, condition.to_glib(), server.as_ref().to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_rtsp_server_io_func(socket.as_ref().to_glib_none().0, condition.to_glib(), server.as_ref().to_glib_none().0), "Failed to connect the source")
         }
     }
 }
@@ -94,7 +94,7 @@ pub trait RTSPServerExt: 'static {
 
     fn set_thread_pool<'a, P: IsA<RTSPThreadPool> + 'a, Q: Into<Option<&'a P>>>(&self, pool: Q);
 
-    fn transfer_connection<'a, P: IsA<gio::Socket>, Q: Into<Option<&'a str>>>(&self, socket: &P, ip: &str, port: i32, initial_buffer: Q) -> bool;
+    fn transfer_connection<'a, P: IsA<gio::Socket>, Q: Into<Option<&'a str>>>(&self, socket: &P, ip: &str, port: i32, initial_buffer: Q) -> Result<(), glib::error::BoolError>;
 
     fn connect_client_connected<F: Fn(&Self, &RTSPClient) + Send + Sync + 'static>(&self, f: F) -> SignalHandlerId;
 
@@ -228,10 +228,10 @@ impl<O: IsA<RTSPServer>> RTSPServerExt for O {
         }
     }
 
-    fn transfer_connection<'a, P: IsA<gio::Socket>, Q: Into<Option<&'a str>>>(&self, socket: &P, ip: &str, port: i32, initial_buffer: Q) -> bool {
+    fn transfer_connection<'a, P: IsA<gio::Socket>, Q: Into<Option<&'a str>>>(&self, socket: &P, ip: &str, port: i32, initial_buffer: Q) -> Result<(), glib::error::BoolError> {
         let initial_buffer = initial_buffer.into();
         unsafe {
-            from_glib(ffi::gst_rtsp_server_transfer_connection(self.as_ref().to_glib_none().0, socket.as_ref().to_glib_full(), ip.to_glib_none().0, port, initial_buffer.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_rtsp_server_transfer_connection(self.as_ref().to_glib_none().0, socket.as_ref().to_glib_full(), ip.to_glib_none().0, port, initial_buffer.to_glib_none().0), "Failed to transfer to the connection")
         }
     }
 
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_stream.rs b/gstreamer-rtsp-server/src/auto/rtsp_stream.rs
index 501569a14..0cf69bebe 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_stream.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_stream.rs
@@ -136,7 +136,7 @@ pub trait RTSPStreamExt: 'static {
 
     fn set_address_pool<'a, P: IsA<RTSPAddressPool> + 'a, Q: Into<Option<&'a P>>>(&self, pool: Q);
 
-    fn set_blocked(&self, blocked: bool) -> bool;
+    fn set_blocked(&self, blocked: bool) -> Result<(), glib::error::BoolError>;
 
     fn set_buffer_size(&self, size: u32);
 
@@ -166,9 +166,9 @@ pub trait RTSPStreamExt: 'static {
 
     //fn transport_filter(&self, func: /*Unimplemented*/Fn(&RTSPStream, &RTSPStreamTransport) -> /*Ignored*/RTSPFilterResult, user_data: /*Unimplemented*/Option<Fundamental: Pointer>) -> Vec<RTSPStreamTransport>;
 
-    fn unblock_linked(&self) -> bool;
+    fn unblock_linked(&self) -> Result<(), glib::error::BoolError>;
 
-    fn update_crypto<'a, P: Into<Option<&'a gst::Caps>>>(&self, ssrc: u32, crypto: P) -> bool;
+    fn update_crypto<'a, P: Into<Option<&'a gst::Caps>>>(&self, ssrc: u32, crypto: P) -> Result<(), glib::error::BoolError>;
 
     fn connect_new_rtcp_encoder<F: Fn(&Self, &gst::Element) + Send + Sync + 'static>(&self, f: F) -> SignalHandlerId;
 
@@ -453,9 +453,9 @@ impl<O: IsA<RTSPStream>> RTSPStreamExt for O {
         }
     }
 
-    fn set_blocked(&self, blocked: bool) -> bool {
+    fn set_blocked(&self, blocked: bool) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_rtsp_stream_set_blocked(self.as_ref().to_glib_none().0, blocked.to_glib()))
+            glib_result_from_gboolean!(ffi::gst_rtsp_stream_set_blocked(self.as_ref().to_glib_none().0, blocked.to_glib()), "Failed to block/unblock the dataflow")
         }
     }
 
@@ -543,16 +543,16 @@ impl<O: IsA<RTSPStream>> RTSPStreamExt for O {
     //    unsafe { TODO: call ffi::gst_rtsp_stream_transport_filter() }
     //}
 
-    fn unblock_linked(&self) -> bool {
+    fn unblock_linked(&self) -> Result<(), glib::error::BoolError> {
         unsafe {
-            from_glib(ffi::gst_rtsp_stream_unblock_linked(self.as_ref().to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_rtsp_stream_unblock_linked(self.as_ref().to_glib_none().0), "Failed to unblock the dataflow")
         }
     }
 
-    fn update_crypto<'a, P: Into<Option<&'a gst::Caps>>>(&self, ssrc: u32, crypto: P) -> bool {
+    fn update_crypto<'a, P: Into<Option<&'a gst::Caps>>>(&self, ssrc: u32, crypto: P) -> Result<(), glib::error::BoolError> {
         let crypto = crypto.into();
         unsafe {
-            from_glib(ffi::gst_rtsp_stream_update_crypto(self.as_ref().to_glib_none().0, ssrc, crypto.to_glib_none().0))
+            glib_result_from_gboolean!(ffi::gst_rtsp_stream_update_crypto(self.as_ref().to_glib_none().0, ssrc, crypto.to_glib_none().0), "Failed to update crypto")
         }
     }
 
diff --git a/gstreamer-rtsp-server/src/rtsp_auth.rs b/gstreamer-rtsp-server/src/rtsp_auth.rs
index 214e1822e..4316427ee 100644
--- a/gstreamer-rtsp-server/src/rtsp_auth.rs
+++ b/gstreamer-rtsp-server/src/rtsp_auth.rs
@@ -1,11 +1,33 @@
 use ffi;
+use glib::object::Cast;
 use glib::object::IsA;
+use glib::signal::connect_raw;
+use glib::signal::SignalHandlerId;
 use glib::translate::*;
+
+use std::boxed::Box as Box_;
+use std::mem::transmute;
+
 use RTSPAuth;
 use RTSPToken;
 
 pub trait RTSPAuthExtManual: 'static {
     fn set_default_token<'a, P: Into<Option<&'a mut RTSPToken>>>(&self, token: P);
+
+    fn connect_accept_certificate<
+        F: Fn(
+                &Self,
+                &gio::TlsConnection,
+                &gio::TlsCertificate,
+                gio::TlsCertificateFlags,
+            ) -> Result<(), gst::LoggableError>
+            + Send
+            + Sync
+            + 'static,
+    >(
+        &self,
+        f: F,
+    ) -> SignalHandlerId;
 }
 
 impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {
@@ -18,4 +40,66 @@ impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {
             );
         }
     }
+
+    fn connect_accept_certificate<
+        F: Fn(
+                &Self,
+                &gio::TlsConnection,
+                &gio::TlsCertificate,
+                gio::TlsCertificateFlags,
+            ) -> Result<(), gst::LoggableError>
+            + Send
+            + Sync
+            + 'static,
+    >(
+        &self,
+        f: F,
+    ) -> SignalHandlerId {
+        unsafe {
+            let f: Box_<F> = Box_::new(f);
+            connect_raw(
+                self.as_ptr() as *mut _,
+                b"accept-certificate\0".as_ptr() as *const _,
+                Some(transmute(accept_certificate_trampoline::<Self, F> as usize)),
+                Box_::into_raw(f),
+            )
+        }
+    }
+}
+
+unsafe extern "C" fn accept_certificate_trampoline<
+    P,
+    F: Fn(
+            &P,
+            &gio::TlsConnection,
+            &gio::TlsCertificate,
+            gio::TlsCertificateFlags,
+        ) -> Result<(), gst::LoggableError>
+        + Send
+        + Sync
+        + 'static,
+>(
+    this: *mut ffi::GstRTSPAuth,
+    connection: *mut gio_ffi::GTlsConnection,
+    peer_cert: *mut gio_ffi::GTlsCertificate,
+    errors: gio_ffi::GTlsCertificateFlags,
+    f: glib_ffi::gpointer,
+) -> glib_ffi::gboolean
+where
+    P: IsA<RTSPAuth>,
+{
+    let f: &F = transmute(f);
+    match f(
+        &RTSPAuth::from_glib_borrow(this).unsafe_cast(),
+        &from_glib_borrow(connection),
+        &from_glib_borrow(peer_cert),
+        from_glib(errors),
+    ) {
+        Ok(()) => true,
+        Err(err) => {
+            err.log();
+            false
+        }
+    }
+    .to_glib()
 }