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diff --git a/Src/external_dependencies/libmp4v2/mp4descriptor.h b/Src/external_dependencies/libmp4v2/mp4descriptor.h
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+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (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.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is MPEG4IP.
+ * 
+ * The Initial Developer of the Original Code is Cisco Systems Inc.
+ * Portions created by Cisco Systems Inc. are
+ * Copyright (C) Cisco Systems Inc. 2001.  All Rights Reserved.
+ * 
+ * Contributor(s): 
+ *		Dave Mackie		dmackie@cisco.com
+ */
+
+#ifndef __MP4_DESCRIPTOR_INCLUDED__
+#define __MP4_DESCRIPTOR_INCLUDED__
+
+class MP4Descriptor {
+public:
+	MP4Descriptor(u_int8_t tag = 0);
+
+	virtual ~MP4Descriptor();
+
+	u_int8_t GetTag() {
+		return m_tag;
+	}
+	void SetTag(u_int8_t tag) {
+		m_tag = tag;
+	}
+
+	void SetParentAtom(MP4Atom* pParentAtom) {
+		m_pParentAtom = pParentAtom;
+		for (u_int32_t i = 0; i < m_pProperties.Size(); i++) {
+			m_pProperties[i]->SetParentAtom(pParentAtom);
+		}
+	}
+
+	void AddProperty(MP4Property* pProperty);
+
+	virtual void Generate();
+	virtual void Read(MP4File* pFile);
+	virtual void Write(MP4File* pFile);
+
+	MP4Property* GetProperty(u_int32_t index) {
+		return m_pProperties[index];
+	}
+
+	// use with extreme caution
+	void SetProperty(u_int32_t index, MP4Property* pProperty) {
+		m_pProperties[index] = pProperty;
+	}
+
+	bool FindProperty(const char* name, 
+	  MP4Property** ppProperty, u_int32_t* pIndex = NULL) {
+		return FindContainedProperty(name, ppProperty, pIndex);
+	}
+
+	void WriteToMemory(MP4File* pFile,
+		 u_int8_t** ppBytes, u_int64_t* pNumBytes);
+
+protected:
+	void SetReadMutate(u_int32_t propIndex) {
+		m_readMutatePoint = propIndex;
+	}
+
+	void ReadHeader(MP4File* pFile);
+	void ReadProperties(MP4File* pFile,
+		u_int32_t startIndex = 0, u_int32_t count = 0xFFFFFFFF);
+
+	virtual void Mutate() {
+		// default is a no-op
+	};
+
+	bool FindContainedProperty(const char* name,
+		MP4Property** ppProperty, u_int32_t* pIndex);
+
+	u_int8_t GetDepth();
+
+protected:
+	MP4Atom*			m_pParentAtom;
+	u_int8_t			m_tag;
+	u_int64_t			m_start;
+	u_int32_t			m_size;
+	MP4PropertyArray	m_pProperties;
+	u_int32_t			m_readMutatePoint;
+};
+
+#endif /* __MP4_DESCRIPTOR_INCLUDED__ */