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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            inputfilter.h
+ *
+ *  Tue Jun 14 20:42:52 CEST 2016
+ *  Copyright 2016 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <event.h>
+
+//! An abstract filter component for the InputProcessor class filter chain.
+class InputFilter
+{
+public:
+	//! Implement to filter a single event.
+	//! \param[in,out] event The event being processed. The filter method
+	//!  might alter any of the event parameters.
+	//! \param pos The absolute position of the buffer in which the event in
+	//!  event was received. Add event.pos to it to get the absolute position of
+	//!  the event in the stream.
+	//! \return true to keep the event, false to discard it.
+	virtual bool filter(event_t& event, std::size_t pos) = 0;
+
+	//! Returns the filter delay in samples.
+	//! Overload if needed.
+	virtual std::size_t getLatency() const
+	{
+		return 0;
+	}
+};