1 files changed, 98 insertions, 0 deletions
diff --git a/dom/media/platforms/apple/AppleUtils.h b/dom/media/platforms/apple/AppleUtils.h
new file mode 100644
index 000000000..9e30aff86
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+++ b/dom/media/platforms/apple/AppleUtils.h
@@ -0,0 +1,98 @@
+/* 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"
+
+namespace mozilla {
+
+// Wrapper class to call CFRelease on reference types
+// when they go out of scope.
+template <class T>
+class AutoCFRelease {
+public:
+  MOZ_IMPLICIT AutoCFRelease(T aRef)
+    : mRef(aRef)
+  {
+  }
+  ~AutoCFRelease()
+  {
+    if (mRef) {
+      CFRelease(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.
+  AutoCFRelease<T>& operator=(const AutoCFRelease<T>&);
+  T mRef;
+};
+
+// 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