filter/plugins/null: move code to src/filter/NullFilter.hxx

src/filter/NullFilter.hxx

+/*
+ * Copyright 2003-2019 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_NULL_FILTER_HXX
+#define MPD_NULL_FILTER_HXX
+
+#include "filter/Filter.hxx"
+#include "util/ConstBuffer.hxx"
+
+class NullFilter final : public Filter {
+public:
+	explicit NullFilter(const AudioFormat &af):Filter(af) {}
+
+	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override {
+		return src;
+	}
+};
+
+#endif

src/filter/plugins/NullFilterPlugin.cxx

@@ -26,20 +26,10 @@
 
 #include "NullFilterPlugin.hxx"
 #include "filter/FilterPlugin.hxx"
-#include "filter/Filter.hxx"
+#include "filter/NullFilter.hxx"
 #include "filter/Prepared.hxx"
 #include "AudioFormat.hxx"
 #include "util/Compiler.h"
-#include "util/ConstBuffer.hxx"
-
-class NullFilter final : public Filter {
-public:
-	explicit NullFilter(const AudioFormat &af):Filter(af) {}
-
-	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override {
-		return src;
-	}
-};
 
 class PreparedNullFilter final : public PreparedFilter {
 public: