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diff --git a/libs/ardour/ardour/rt_midibuffer.h b/libs/ardour/ardour/rt_midibuffer.h
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+++ b/libs/ardour/ardour/rt_midibuffer.h
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+/*
+ * Copyright (C) 2007-2016 David Robillard <d@drobilla.net>
+ * Copyright (C) 2007-2018 Paul Davis <paul@linuxaudiosystems.com>
+ * Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
+ * Copyright (C) 2009 Hans Baier <hansfbaier@googlemail.com>
+ * Copyright (C) 2014-2016 Robin Gareus <robin@gareus.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 __ardour_rt_midi_buffer_h__
+#define __ardour_rt_midi_buffer_h__
+
+#include <map>
+
+#include "evoral/Event.hpp"
+#include "evoral/EventSink.hpp"
+#include "ardour/types.h"
+
+namespace ARDOUR {
+
+class MidiBuffer;
+
+/**  */
+class LIBARDOUR_API RTMidiBuffer : public Evoral::EventSink<samplepos_t>
+{
+  public:
+	typedef samplepos_t TimeType;
+
+	RTMidiBuffer (size_t capacity);
+	~RTMidiBuffer();
+
+	void clear() { _size = 0; }
+	void resize(size_t);
+	size_t size() const { return _size; }
+
+	uint32_t write (TimeType time, Evoral::EventType type, uint32_t size, const uint8_t* buf);
+	uint32_t read (MidiBuffer& dst, samplepos_t start, samplepos_t end, samplecnt_t offset = 0);
+
+  private:
+	size_t _size;
+	size_t _capacity;
+	uint8_t* _data; ///< event data
+	typedef std::multimap<TimeType,size_t> Map;
+	Map _map;
+};
+
+} // namespace ARDOUR
+
+#endif // __ardour_rt_midi_buffer_h__