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diff --git a/libs/vamp-pyin/Yin.h b/libs/vamp-pyin/Yin.h
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+++ b/libs/vamp-pyin/Yin.h
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    pYIN - A fundamental frequency estimator for monophonic audio
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _YIN_H_
+#define _YIN_H_
+
+#include "vamp-sdk/FFT.h"
+#include "MeanFilter.h"
+
+#include <cmath>
+
+#include <iostream>
+#include <vector>
+#include <exception>
+
+using std::vector;
+using std::pair;
+
+
+
+class Yin
+{
+public:
+    Yin(size_t frameSize, size_t inputSampleRate, double thresh = 0.2, bool fast = true);
+    virtual ~Yin();
+
+    struct YinOutput {
+        double f0;
+        double periodicity;
+        double rms;
+        vector<double> salience;
+        vector<pair<double, double> > freqProb;
+        YinOutput() :  f0(0), periodicity(0), rms(0), 
+            salience(vector<double>(0)), freqProb(vector<pair<double, double> >(0)) { }
+        YinOutput(double _f, double _p, double _r) :
+            f0(_f), periodicity(_p), rms(_r), 
+            salience(vector<double>(0)), freqProb(vector<pair<double, double> >(0)) { }
+        YinOutput(double _f, double _p, double _r, vector<double> _salience) :
+            f0(_f), periodicity(_p), rms(_r), salience(_salience), 
+            freqProb(vector<pair<double, double> >(0)) { }
+    };
+    
+    int setThreshold(double parameter);
+    int setThresholdDistr(float parameter);
+    int setFrameSize(size_t frameSize);
+    int setFast(bool fast);
+    // int setRemoveUnvoiced(bool frameSize);
+    YinOutput process(const double *in) const;
+    YinOutput processProbabilisticYin(const double *in) const;
+
+private:
+    mutable size_t m_frameSize;
+    mutable size_t m_inputSampleRate;
+    mutable double m_thresh;
+    mutable size_t m_threshDistr;
+    mutable size_t m_yinBufferSize;
+    mutable bool   m_fast;
+    // mutable bool m_removeUnvoiced;
+};
+
+#endif