1 files changed, 60 insertions, 0 deletions
diff --git a/src/filter/plugins/NullFilterPlugin.cxx b/src/filter/plugins/NullFilterPlugin.cxx
new file mode 100644
index 000000000..ebd8e4ec5
--- /dev/null
+++ b/src/filter/plugins/NullFilterPlugin.cxx
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+/** \file
+ *
+ * This filter plugin does nothing.  That is not quite useful, except
+ * for testing the filter core, or as a template for new filter
+ * plugins.
+ */
+
+#include "config.h"
+#include "filter/FilterPlugin.hxx"
+#include "filter/FilterInternal.hxx"
+#include "filter/FilterRegistry.hxx"
+#include "AudioFormat.hxx"
+#include "Compiler.h"
+#include "util/ConstBuffer.hxx"
+
+class NullFilter final : public Filter {
+public:
+	virtual AudioFormat Open(AudioFormat &af,
+				 gcc_unused Error &error) override {
+		return af;
+	}
+
+	virtual void Close() override {}
+
+	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
+					    gcc_unused Error &error) override {
+		return src;
+	}
+};
+
+static Filter *
+null_filter_init(gcc_unused const config_param &param,
+		 gcc_unused Error &error)
+{
+	return new NullFilter();
+}
+
+const struct filter_plugin null_filter_plugin = {
+	"null",
+	null_filter_init,
+};