1 files changed, 88 insertions, 0 deletions
diff --git a/dom/media/platforms/apple/AppleUtils.h b/dom/media/platforms/apple/AppleUtils.h
new file mode 100644
index 0000000000..96bf079b0c
--- /dev/null
+++ b/dom/media/platforms/apple/AppleUtils.h
@@ -0,0 +1,88 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Utility functions to help with Apple API calls.
+
+#ifndef mozilla_AppleUtils_h
+#define mozilla_AppleUtils_h
+
+#include "mozilla/Attributes.h"
+#include <CoreFoundation/CFBase.h>  // For CFRelease()
+#include <CoreVideo/CVBuffer.h>     // For CVBufferRelease()
+
+namespace mozilla {
+
+// Wrapper class to call CFRelease/CVBufferRelease on reference types
+// when they go out of scope.
+template <class T, class F, F relFunc>
+class AutoObjRefRelease {
+ public:
+  MOZ_IMPLICIT AutoObjRefRelease(T aRef) : mRef(aRef) {}
+  ~AutoObjRefRelease() {
+    if (mRef) {
+      relFunc(mRef);
+    }
+  }
+  // Return the wrapped ref so it can be used as an in parameter.
+  operator T() { return mRef; }
+  // Return a pointer to the wrapped ref for use as an out parameter.
+  T* receive() { return &mRef; }
+
+ private:
+  // Copy operator isn't supported and is not implemented.
+  AutoObjRefRelease<T, F, relFunc>& operator=(
+      const AutoObjRefRelease<T, F, relFunc>&);
+  T mRef;
+};
+
+template <typename T>
+using AutoCFRelease = AutoObjRefRelease<T, decltype(&CFRelease), &CFRelease>;
+template <typename T>
+using AutoCVBufferRelease =
+    AutoObjRefRelease<T, decltype(&CVBufferRelease), &CVBufferRelease>;
+
+// CFRefPtr: A CoreFoundation smart pointer.
+template <class T>
+class CFRefPtr {
+ public:
+  explicit CFRefPtr(T aRef) : mRef(aRef) {
+    if (mRef) {
+      CFRetain(mRef);
+    }
+  }
+  // Copy constructor.
+  CFRefPtr(const CFRefPtr<T>& aCFRefPtr) : mRef(aCFRefPtr.mRef) {
+    if (mRef) {
+      CFRetain(mRef);
+    }
+  }
+  // Copy operator
+  CFRefPtr<T>& operator=(const CFRefPtr<T>& aCFRefPtr) {
+    if (mRef == aCFRefPtr.mRef) {
+      return;
+    }
+    if (mRef) {
+      CFRelease(mRef);
+    }
+    mRef = aCFRefPtr.mRef;
+    if (mRef) {
+      CFRetain(mRef);
+    }
+    return *this;
+  }
+  ~CFRefPtr() {
+    if (mRef) {
+      CFRelease(mRef);
+    }
+  }
+  // Return the wrapped ref so it can be used as an in parameter.
+  operator T() { return mRef; }
+
+ private:
+  T mRef;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_AppleUtils_h