encoder/vorbis: add wrapper class for vorbis_comment

src/lib/xiph/VorbisComment.hxx

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2003-2016 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_VORBIS_COMMENT_HXX
+#define MPD_VORBIS_COMMENT_HXX
+
+#include "check.h"
+
+#include <vorbis/codec.h>
+
+/**
+ * OO wrapper for a #vorbis_comment instance.
+ */
+class VorbisComment {
+	vorbis_comment vc;
+
+public:
+	VorbisComment() {
+		vorbis_comment_init(&vc);
+	}
+
+	~VorbisComment() {
+		vorbis_comment_clear(&vc);
+	}
+
+	VorbisComment(const VorbisComment &) = delete;
+	VorbisComment &operator=(const VorbisComment &) = delete;
+
+	operator vorbis_comment &() {
+		return vc;
+	}
+
+	operator vorbis_comment *() {
+		return &vc;
+	}
+
+	void AddTag(const char *tag, const char *contents) {
+		vorbis_comment_add_tag(&vc, tag, contents);
+	}
+};
+
+#endif