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diff --git a/libs/evoral/evoral/TypeMap.h b/libs/evoral/evoral/TypeMap.h
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+/*
+ * Copyright (C) 2008-2016 David Robillard <d@drobilla.net>
+ *
+ * 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 EVORAL_TYPE_MAP_HPP
+#define EVORAL_TYPE_MAP_HPP
+
+#include <stdint.h>
+
+#include <string>
+
+#include "evoral/visibility.h"
+#include "evoral/types.h"
+
+namespace Evoral {
+
+class Parameter;
+class ParameterDescriptor;
+
+/** The applications passes one of these which provide the implementation
+ * with required information about event types in an opaque, type neutral way
+ */
+class /*LIBEVORAL_API*/ TypeMap {
+public:
+	virtual ~TypeMap() {}
+
+	/** Return true iff the type is a MIDI event.
+	 * The contents of the event will be used for specific ID
+	 */
+	virtual bool type_is_midi(uint32_t type) const = 0;
+
+	/** Return the MIDI type (ie status byte with channel 0) for a
+	 * parameter, or 0 if parameter can not be expressed as a MIDI event
+	 */
+	virtual uint8_t parameter_midi_type(const Parameter& param) const = 0;
+
+	/** The parameter type for the given MIDI event. */
+	virtual ParameterType midi_parameter_type(const uint8_t* buf, uint32_t len) const = 0;
+
+	/** Return the description of a parameter. */
+	virtual ParameterDescriptor descriptor(const Parameter& param) const = 0;
+
+	virtual std::string to_symbol(const Parameter& param) const = 0;
+};
+
+} // namespace Evoral
+
+#endif // EVORAL_TYPE_MAP_HPP