From a26fcaf0adea72581e08bec5a6114b19d102cf00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Thu, 26 Oct 2023 13:39:44 +0300
Subject: [PATCH] gstreamer: meta: Add `upcast_ref()` function to go from a
 specific to a generic meta

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1331>
---
 gstreamer/src/meta.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/gstreamer/src/meta.rs b/gstreamer/src/meta.rs
index 14e3eec64..ebf774bea 100644
--- a/gstreamer/src/meta.rs
+++ b/gstreamer/src/meta.rs
@@ -212,6 +212,11 @@ impl<'a, T> MetaRef<'a, T> {
         }
     }
 
+    #[inline]
+    pub fn upcast_ref(&self) -> &MetaRef<'a, Meta> {
+        unsafe { &*(self as *const MetaRef<'a, T> as *const MetaRef<'a, Meta>) }
+    }
+
     #[inline]
     pub fn as_ptr(&self) -> *const T::GstType
     where
@@ -288,6 +293,16 @@ impl<'a, T, U> MetaRefMut<'a, T, U> {
         }
     }
 
+    #[inline]
+    pub fn upcast_ref(&self) -> &MetaRef<'a, Meta> {
+        unsafe { &*(self as *const MetaRefMut<'a, T, U> as *const MetaRef<'a, Meta>) }
+    }
+
+    #[inline]
+    pub fn upcast_mut(&mut self) -> &MetaRefMut<'a, Meta, U> {
+        unsafe { &mut *(self as *mut MetaRefMut<'a, T, U> as *mut MetaRefMut<'a, Meta, U>) }
+    }
+
     #[inline]
     pub fn as_ptr(&self) -> *const T::GstType
     where