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diff --git a/src/ocidescriptors.h b/src/ocidescriptors.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 MP4V2_IMPL_OCIDESCRIPTORS_H
+#define MP4V2_IMPL_OCIDESCRIPTORS_H
+
+namespace mp4v2 {
+namespace impl {
+
+///////////////////////////////////////////////////////////////////////////////
+
+const uint8_t MP4OCIDescrTagsStart          = 0x40;
+const uint8_t MP4ContentClassDescrTag       = 0x40;
+const uint8_t MP4KeywordDescrTag            = 0x41;
+const uint8_t MP4RatingDescrTag             = 0x42;
+const uint8_t MP4LanguageDescrTag           = 0x43;
+const uint8_t MP4ShortTextDescrTag          = 0x44;
+const uint8_t MP4ExpandedTextDescrTag       = 0x45;
+const uint8_t MP4ContentCreatorDescrTag = 0x46;
+const uint8_t MP4ContentCreationDescrTag    = 0x47;
+const uint8_t MP4OCICreatorDescrTag     = 0x48;
+const uint8_t MP4OCICreationDescrTag        = 0x49;
+const uint8_t MP4SmpteCameraDescrTag        = 0x4A;
+const uint8_t MP4OCIDescrTagsEnd            = 0x5F;
+
+class MP4ContentClassDescriptor : public MP4Descriptor {
+public:
+    MP4ContentClassDescriptor();
+    void Read(MP4File* pFile);
+};
+
+class MP4KeywordDescriptor : public MP4Descriptor {
+public:
+    MP4KeywordDescriptor();
+protected:
+    void Mutate();
+};
+
+class MP4RatingDescriptor : public MP4Descriptor {
+public:
+    MP4RatingDescriptor();
+    void Read(MP4File* pFile);
+};
+
+class MP4LanguageDescriptor : public MP4Descriptor {
+public:
+    MP4LanguageDescriptor();
+};
+
+class MP4ShortTextDescriptor : public MP4Descriptor {
+public:
+    MP4ShortTextDescriptor();
+protected:
+    void Mutate();
+};
+
+class MP4ExpandedTextDescriptor : public MP4Descriptor {
+public:
+    MP4ExpandedTextDescriptor();
+protected:
+    void Mutate();
+};
+
+class MP4CreatorDescriptor : public MP4Descriptor {
+public:
+    MP4CreatorDescriptor(uint8_t tag);
+};
+
+class MP4CreationDescriptor : public MP4Descriptor {
+public:
+    MP4CreationDescriptor(uint8_t tag);
+};
+
+class MP4SmpteCameraDescriptor : public MP4Descriptor {
+public:
+    MP4SmpteCameraDescriptor();
+};
+
+class MP4UnknownOCIDescriptor : public MP4Descriptor {
+public:
+    MP4UnknownOCIDescriptor();
+    void Read(MP4File* pFile);
+};
+
+
+extern MP4Descriptor *CreateOCIDescriptor(uint8_t tag);
+
+///////////////////////////////////////////////////////////////////////////////
+
+}
+} // namespace mp4v2::impl
+
+#endif // MP4V2_IMPL_OCIDESCRIPTORS_H