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diff --git a/libs/audiographer/audiographer/general/loudness_reader.h b/libs/audiographer/audiographer/general/loudness_reader.h
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+++ b/libs/audiographer/audiographer/general/loudness_reader.h
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+/*
+ * Copyright (C) 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 AUDIOGRAPHER_LOUDNESS_READER_H
+#define AUDIOGRAPHER_LOUDNESS_READER_H
+
+#include <vamp-hostsdk/PluginLoader.h>
+#include <vamp-sdk/Plugin.h>
+
+#include "audiographer/visibility.h"
+#include "audiographer/sink.h"
+#include "audiographer/routines.h"
+#include "audiographer/utils/listed_source.h"
+
+namespace AudioGrapher
+{
+
+class LIBAUDIOGRAPHER_API LoudnessReader : public ListedSource<float>, public Sink<float>
+{
+  public:
+	LoudnessReader (float sample_rate, unsigned int channels, framecnt_t bufsize);
+	~LoudnessReader ();
+
+	void reset ();
+
+	float get_normalize_gain (float target_lufs, float target_dbtp);
+	float get_peak (float target_lufs = -23.f, float target_dbtp = -1.f) {
+		return 1.f / get_normalize_gain (target_lufs, target_dbtp);
+	}
+
+	virtual void process (ProcessContext<float> const & c);
+
+	using Sink<float>::process;
+
+  protected:
+	Vamp::Plugin*  _ebur_plugin;
+	Vamp::Plugin** _dbtp_plugin;
+
+	float        _sample_rate;
+	unsigned int _channels;
+	framecnt_t   _bufsize;
+	framecnt_t   _pos;
+	float*       _bufs[2];
+};
+
+} // namespace
+
+
+#endif // AUDIOGRAPHER_LOUDNESS_READER_H