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diff --git a/src/content_asset.h b/src/content_asset.h
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+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef LIBDCP_ASSET_H
+#define LIBDCP_ASSET_H
+
+#include <string>
+#include <list>
+#include <boost/filesystem.hpp>
+#include <boost/function.hpp>
+#include <libxml++/libxml++.h>
+#include "types.h"
+
+namespace ASDCP {
+	class WriterInfo;
+}
+
+namespace xmlpp {
+	class Element;
+}
+
+namespace dcp
+{
+
+/** XXX */
+class ContentAsset
+{
+public:
+	/** Construct a ContentAsset.
+	 *  @param directory Directory where our XML or MXF file is.
+	 *  @param file_name Name of our file within directory, or empty to make one up based on UUID.
+	 */
+	ContentAsset (boost::filesystem::path directory, boost::filesystem::path file_name = "");
+
+	virtual ~ContentAsset() {}
+
+	/** Write details of the asset to a CPL AssetList node.
+	 *  @param p Parent element.
+	 */
+	virtual void write_to_cpl (xmlpp::Element* p) const = 0;
+
+	/** Write details of the asset to a PKL AssetList node.
+	 *  @param p Parent node.
+	 */
+	void write_to_pkl (xmlpp::Node *) const;
+
+	/** Write details of the asset to a ASSETMAP stream.
+	 *  @param s Stream.
+	 */
+	void write_to_assetmap (xmlpp::Node *) const;
+
+	/** Compute the digest for this asset.  Calling this is optional: if
+	 *  it is not called, the digest will be computed when required.  However,
+	 *  calling this method allows the caller to see the progress of the
+	 *  computation, which can be long for large assets.
+	 *  @param Called with progress between 0 and 1.
+	 */
+	void compute_digest (boost::function<void (float)> progress);
+
+	std::string uuid () const {
+		return _uuid;
+	}
+
+	boost::filesystem::path path () const;
+
+	void set_directory (boost::filesystem::path d) {
+		_directory = d;
+	}
+
+	void set_file_name (boost::filesystem::path f) {
+		_file_name = f;
+	}
+
+	int entry_point () const {
+		return _entry_point;
+	}
+
+	int duration () const {
+		return _duration;
+	}
+	
+	int intrinsic_duration () const {
+		return _intrinsic_duration;
+	}
+	
+	int edit_rate () const {
+		return _edit_rate;
+	}
+
+	void set_entry_point (int e) {
+		_entry_point = e;
+	}
+	
+	void set_duration (int d) {
+		_duration = d;
+	}
+
+	void set_intrinsic_duration (int d) {
+		_intrinsic_duration = d;
+	}
+
+	void set_edit_rate (int r) {
+		_edit_rate = r;
+	}
+
+	virtual bool equals (boost::shared_ptr<const ContentAsset> other, EqualityOptions opt, boost::function<void (NoteType, std::string)>) const;
+
+protected:
+	
+	std::string digest () const;
+
+	/** Directory that our MXF or XML file is in */
+	boost::filesystem::path _directory;
+	/** Name of our MXF or XML file */
+	boost::filesystem::path _file_name;
+	/** Our UUID */
+	std::string _uuid;
+	/** The edit rate; this is normally equal to the number of video frames per second */
+	int _edit_rate;
+	/** Start point to present in frames */
+	int _entry_point;
+	/** Total length in frames */
+	int _intrinsic_duration;
+	/** Length to present in frames */
+	int _duration;
+
+private:	
+	/** Digest of our MXF or XML file */
+	mutable std::string _digest;
+};
+
+}
+
+#endif