gstreamer: Manually implement Allocator::register()

Due to a bug it causes use-after-free in versions < 1.20.5, so work
around that here.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1147>

gstreamer/Gir.toml

@@ -394,6 +394,10 @@ status = "generate"
 [[object]]
 name = "Gst.Allocator"
 status = "generate"
+    [[object.function]]
+    name = "register"
+    # Steals the string name in < 1.20.5
+    manual = true
 
     [[object.function]]
     name = "alloc"

gstreamer/src/allocator.rs

@@ -0,0 +1,23 @@
+// Take a look at the license at the top of the repository in the LICENSE file.
+
+use crate::Allocator;
+use glib::translate::*;
+use glib::IsA;
+
+impl Allocator {
+    #[doc(alias = "gst_allocator_register")]
+    pub fn register(name: &str, allocator: &impl IsA<Allocator>) {
+        skip_assert_initialized!();
+        unsafe {
+            // See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3364
+            if crate::version() < (1, 20, 5, 0) {
+                ffi::gst_allocator_register(name.to_glib_full(), allocator.as_ref().to_glib_full());
+            } else {
+                ffi::gst_allocator_register(
+                    name.to_glib_none().0,
+                    allocator.as_ref().to_glib_full(),
+                );
+            }
+        }
+    }
+}

gstreamer/src/auto/allocator.rs

@@ -26,14 +26,6 @@ impl Allocator {
         assert_initialized_main_thread!();
         unsafe { from_glib_full(ffi::gst_allocator_find(name.to_glib_none().0)) }
     }
-
-    #[doc(alias = "gst_allocator_register")]
-    pub fn register(name: &str, allocator: &impl IsA<Allocator>) {
-        skip_assert_initialized!();
-        unsafe {
-            ffi::gst_allocator_register(name.to_glib_none().0, allocator.as_ref().to_glib_full());
-        }
-    }
 }
 
 unsafe impl Send for Allocator {}

gstreamer/src/lib.rs

@@ -153,6 +153,7 @@ mod pipeline;
 
 mod allocation_params;
 pub use self::allocation_params::AllocationParams;
+mod allocator;
 
 mod element_factory_type;
 pub use element_factory_type::*;