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diff --git a/avmedia/source/macavf/macavfcommon.hxx b/avmedia/source/macavf/macavfcommon.hxx
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index 0000000000..b031f1ecc5
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+++ b/avmedia/source/macavf/macavfcommon.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <premac.h>
+#import <Cocoa/Cocoa.h>
+#import <AVFoundation/AVFoundation.h>
+#include <postmac.h>
+
+#include <unordered_map>
+
+#include <osl/mutex.hxx>
+#include <rtl/ustring.hxx>
+#include <tools/stream.hxx>
+#include <tools/urlobj.hxx>
+#include <cppuhelper/weak.hxx>
+#include <cppuhelper/factory.hxx>
+
+#include <com/sun/star/uno/Reference.h>
+#include <com/sun/star/uno/RuntimeException.hpp>
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+#include <com/sun/star/registry/XRegistryKey.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/awt/Rectangle.hpp>
+#include <com/sun/star/awt/KeyModifier.hpp>
+#include <com/sun/star/awt/MouseButton.hpp>
+#include <com/sun/star/media/XManager.hpp>
+
+
+#define AVMEDIA_MACAVF_PLAYER_IMPLEMENTATIONNAME "com.sun.star.comp.avmedia.Player_MacAVF"
+#define AVMEDIA_MACAVF_PLAYER_SERVICENAME "com.sun.star.media.Player_MacAVF"
+
+#define AVMEDIA_MACAVF_WINDOW_IMPLEMENTATIONNAME "com.sun.star.comp.avmedia.Window_MacAVF"
+#define AVMEDIA_MACAVF_WINDOW_SERVICENAME "com.sun.star.media.Window_MacAVF"
+
+#define AVMEDIA_MACAVF_FRAMEGRABBER_IMPLEMENTATIONNAME "com.sun.star.comp.avmedia.FrameGrabber_MacAVF"
+#define AVMEDIA_MACAVF_FRAMEGRABBER_SERVICENAME "com.sun.star.media.FrameGrabber_MacAVF"
+
+
+// MacAVObserver handles the notifications used in the AVFoundation framework
+
+namespace avmedia::macavf { class MacAVObserverHandler; }
+
+typedef std::unordered_map<NSObject*,avmedia::macavf::MacAVObserverHandler*> HandlersForObject;
+
+@interface MacAVObserverObject : NSObject
+{
+    HandlersForObject maHandlersForObject;
+}
+- (void)observeValueForKeyPath:(NSString*)pKeyPath ofObject:(id)pObject change:(NSDictionary*)pChangeDict context:(void*)pContext;
+- (void)onNotification:(NSNotification*)pNotification;
+@end
+
+namespace avmedia::macavf {
+
+class MacAVObserverHandler
+{
+private:
+    static MacAVObserverObject* mpMacAVObserverObject;
+public:
+    virtual ~MacAVObserverHandler() {}
+    static MacAVObserverObject* getObserver();
+    virtual bool handleObservation( NSString* pKeyPath ) = 0;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */