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diff --git a/src/filter/plugins/TwoFilters.hxx b/src/filter/plugins/TwoFilters.hxx
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+++ b/src/filter/plugins/TwoFilters.hxx
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+/*
+ * Copyright 2003-2020 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_WITH_CONVERT_FILTER_HXX
+#define MPD_WITH_CONVERT_FILTER_HXX
+
+#include "filter/Filter.hxx"
+
+#include <memory>
+
+/**
+ * A #Filter implementation which chains two other filters.
+ */
+class TwoFilters final : public Filter {
+	std::unique_ptr<Filter> first, second;
+
+public:
+	template<typename F, typename S>
+	TwoFilters(F &&_first, S &&_second) noexcept
+		:Filter(_second->GetOutAudioFormat()),
+		 first(std::forward<F>(_first)),
+		 second(std::forward<S>(_second)) {}
+
+	void Reset() noexcept override {
+		first->Reset();
+		second->Reset();
+	}
+
+	ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
+	ConstBuffer<void> Flush() override;
+};
+
+#endif