Prepare multi cluster tag parsing

src/metadata/AvFormat.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Emeric Poupon
+ * Copyright (C) 2018 Emeric Poupon
  *
  * This file is part of LMS.
  *
@@ -17,8 +17,10 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef METADATA_AVFORMAT_HPP
-#define METADATA_AVFORMAT_HPP
+#pragma once
+
+#include <map>
+#include <string>
 
 #include "MetaData.hpp"
 
@@ -30,13 +32,19 @@ class AvFormat : public Parser
 {
 	public:
 
-		bool parse(const boost::filesystem::path& p, Items& items);
+		AvFormat(const std::map<std::string, std::string>& clusterMap
+				= {
+				{"GENRE", "Genre" },
+				{"ALBUMGROUPING", "Group" }
+				});
+
+
+		boost::optional<Items> parse(const boost::filesystem::path& p);
 
 	private:
 
+		std::map<std::string,std::string> _clusterMap;
 };
 
-
 } // namespace MetaData
 
-#endif