diff segmentino/Segmentino.cpp @ 48:69251e11a913

Rename SongParts/songpartitioner to Segmentino throughout

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/segmentino/Segmentino.cpp	Thu Jun 13 09:43:01 2013 +0100
@@ -0,0 +1,1930 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Segmentino
+
+    Code by Massimiliano Zanoni and Matthias Mauch
+    Centre for Digital Music, Queen Mary, University of London
+
+    Copyright 2009-2013 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.
+*/
+
+#include "Segmentino.h"
+
+#include <base/Window.h>
+#include <dsp/onsets/DetectionFunction.h>
+#include <dsp/onsets/PeakPicking.h>
+#include <dsp/transforms/FFT.h>
+#include <dsp/tempotracking/TempoTrackV2.h>
+#include <dsp/tempotracking/DownBeat.h>
+#include <chromamethods.h>
+#include <maths/MathUtilities.h>
+#include <boost/numeric/ublas/matrix.hpp>
+#include <boost/numeric/ublas/io.hpp>
+#include <boost/math/distributions/normal.hpp>
+#include "armadillo"
+#include <fstream>
+#include <sstream>
+#include <cmath>
+#include <vector>
+
+#include <vamp-sdk/Plugin.h>
+
+using namespace boost::numeric;
+using namespace arma;
+using std::string;
+using std::vector;
+using std::cerr;
+using std::cout;
+using std::endl;
+
+
+#ifndef __GNUC__
+#include <alloca.h>
+#endif
+
+
+// Result Struct
+typedef struct Part {
+    int n;
+    vector<int> indices;
+    string letter;
+    int value;
+    int level;
+    int nInd;
+}Part;
+
+
+
+/* ------------------------------------ */
+/* ----- BEAT DETECTOR CLASS ---------- */
+/* ------------------------------------ */
+
+class BeatTrackerData
+{
+    /* --- ATTRIBUTES --- */
+public:
+    DFConfig dfConfig;
+    DetectionFunction *df;
+    DownBeat *downBeat;
+    vector<double> dfOutput;
+    Vamp::RealTime origin;
+    
+    
+    /* --- METHODS --- */
+    
+    /* --- Constructor --- */
+public:
+    BeatTrackerData(float rate, const DFConfig &config) : dfConfig(config) {
+        
+        df = new DetectionFunction(config);
+        // decimation factor aims at resampling to c. 3KHz; must be power of 2
+        int factor = MathUtilities::nextPowerOfTwo(rate / 3000);
+        // std::cerr << "BeatTrackerData: factor = " << factor << std::endl;
+        downBeat = new DownBeat(rate, factor, config.stepSize);
+    }
+    
+    /* --- Desctructor --- */
+    ~BeatTrackerData() {
+        delete df;
+        delete downBeat;
+    }
+    
+    void reset() {
+        delete df;
+        df = new DetectionFunction(dfConfig);
+        dfOutput.clear();
+        downBeat->resetAudioBuffer();
+        origin = Vamp::RealTime::zeroTime;
+    }
+};
+
+
+/* --------------------------------------- */
+/* ----- CHROMA EXTRACTOR CLASS ---------- */
+/* --------------------------------------- */
+
+class ChromaData
+{
+    
+     /* --- ATTRIBUTES --- */
+    
+public:
+    int frameCount;
+    int nBPS;
+    Vamp::Plugin::FeatureList logSpectrum;
+    int blockSize;
+    int lengthOfNoteIndex;
+    vector<float> meanTunings;
+    vector<float> localTunings;
+    float whitening;
+    float preset;
+    float useNNLS;
+    vector<float> localTuning;
+    vector<float> kernelValue;
+    vector<int> kernelFftIndex;
+    vector<int> kernelNoteIndex;
+    float *dict;
+    bool tuneLocal;
+    float doNormalizeChroma;
+    float rollon;
+    float s;
+    vector<float> hw;
+    vector<float> sinvalues;
+    vector<float> cosvalues;
+    Window<float> window;
+    FFTReal fft;
+    int inputSampleRate;
+    
+    /* --- METHODS --- */
+    
+    /* --- Constructor --- */
+    
+public:
+    ChromaData(float inputSampleRate, size_t block_size) :
+        frameCount(0),
+        nBPS(3),
+        logSpectrum(0),
+        blockSize(0),
+        lengthOfNoteIndex(0),
+        meanTunings(0),
+        localTunings(0),
+        whitening(1.0),
+        preset(0.0),
+        useNNLS(1.0),
+        localTuning(0.0),
+        kernelValue(0),
+        kernelFftIndex(0),
+        kernelNoteIndex(0),
+        dict(0),
+        tuneLocal(0.0),
+        doNormalizeChroma(0),
+        rollon(0.0),
+        s(0.7),
+        sinvalues(0),
+        cosvalues(0),
+        window(HanningWindow, block_size),
+        fft(block_size),
+        inputSampleRate(inputSampleRate)
+    {
+        // make the *note* dictionary matrix
+        dict = new float[nNote * 84];
+        for (int i = 0; i < nNote * 84; ++i) dict[i] = 0.0;
+        blockSize = block_size;
+    }
+    
+    
+    /* --- Desctructor --- */
+    
+    ~ChromaData() {
+        delete [] dict;
+    }
+    
+    /* --- Public Methods --- */
+    
+    void reset() {
+        frameCount = 0;
+        logSpectrum.clear();
+        for (int iBPS = 0; iBPS < 3; ++iBPS) {
+            meanTunings[iBPS] = 0;
+            localTunings[iBPS] = 0;
+        }
+        localTuning.clear();
+    }
+    
+    void baseProcess(float *inputBuffers, Vamp::RealTime timestamp)
+    {   
+                
+        frameCount++;   
+        float *magnitude = new float[blockSize/2];
+        double *fftReal = new double[blockSize];
+        double *fftImag = new double[blockSize];
+
+        // FFTReal wants doubles, so we need to make a local copy of inputBuffers
+        double *inputBuffersDouble = new double[blockSize];
+        for (int i = 0; i < blockSize; i++) inputBuffersDouble[i] = inputBuffers[i];
+        
+        fft.process(false, inputBuffersDouble, fftReal, fftImag);
+        
+        float energysum = 0;
+        // make magnitude
+        float maxmag = -10000;
+        for (int iBin = 0; iBin < static_cast<int>(blockSize/2); iBin++) {
+            magnitude[iBin] = sqrt(fftReal[iBin] * fftReal[iBin] + 
+                                   fftImag[iBin] * fftImag[iBin]);
+            if (magnitude[iBin]>blockSize*1.0) magnitude[iBin] = blockSize; 
+            // a valid audio signal (between -1 and 1) should not be limited here.
+            if (maxmag < magnitude[iBin]) maxmag = magnitude[iBin];
+            if (rollon > 0) {
+                energysum += pow(magnitude[iBin],2);
+            }
+        }
+    
+        float cumenergy = 0;
+        if (rollon > 0) {
+            for (int iBin = 2; iBin < static_cast<int>(blockSize/2); iBin++) {
+                cumenergy +=  pow(magnitude[iBin],2);
+                if (cumenergy < energysum * rollon / 100) magnitude[iBin-2] = 0;
+                else break;
+            }
+        }
+    
+        if (maxmag < 2) {
+            // cerr << "timestamp " << timestamp << ": very low magnitude, setting magnitude to all zeros" << endl;
+            for (int iBin = 0; iBin < static_cast<int>(blockSize/2); iBin++) {
+                magnitude[iBin] = 0;
+            }
+        }
+        
+        // cerr << magnitude[200] << endl;
+        
+        // note magnitude mapping using pre-calculated matrix
+        float *nm  = new float[nNote]; // note magnitude
+        for (int iNote = 0; iNote < nNote; iNote++) {
+            nm[iNote] = 0; // initialise as 0
+        }
+        int binCount = 0;
+        for (vector<float>::iterator it = kernelValue.begin(); it != kernelValue.end(); ++it) {
+            nm[kernelNoteIndex[binCount]] += magnitude[kernelFftIndex[binCount]] * kernelValue[binCount];
+            binCount++;  
+        }
+    
+        float one_over_N = 1.0/frameCount;
+        // update means of complex tuning variables
+        for (int iBPS = 0; iBPS < nBPS; ++iBPS) meanTunings[iBPS] *= float(frameCount-1)*one_over_N;
+    
+        for (int iTone = 0; iTone < round(nNote*0.62/nBPS)*nBPS+1; iTone = iTone + nBPS) {
+            for (int iBPS = 0; iBPS < nBPS; ++iBPS) meanTunings[iBPS] += nm[iTone + iBPS]*one_over_N;
+            float ratioOld = 0.997;
+            for (int iBPS = 0; iBPS < nBPS; ++iBPS) {
+                localTunings[iBPS] *= ratioOld; 
+                localTunings[iBPS] += nm[iTone + iBPS] * (1 - ratioOld);
+            }
+        }
+    
+        float localTuningImag = 0;
+        float localTuningReal = 0;
+        for (int iBPS = 0; iBPS < nBPS; ++iBPS) {
+            localTuningReal += localTunings[iBPS] * cosvalues[iBPS];
+            localTuningImag += localTunings[iBPS] * sinvalues[iBPS];
+        }
+    
+        float normalisedtuning = atan2(localTuningImag, localTuningReal)/(2*M_PI);
+        localTuning.push_back(normalisedtuning);
+    
+        Vamp::Plugin::Feature f1; // logfreqspec
+        f1.hasTimestamp = true;
+        f1.timestamp = timestamp;
+        for (int iNote = 0; iNote < nNote; iNote++) {
+            f1.values.push_back(nm[iNote]);
+        }
+    
+        // deletes
+        delete[] inputBuffersDouble;
+        delete[] magnitude;
+        delete[] fftReal;
+        delete[] fftImag;
+        delete[] nm;
+    
+        logSpectrum.push_back(f1); // remember note magnitude
+    }
+    
+    bool initialise()
+    {
+        dictionaryMatrix(dict, s);
+        
+        // make things for tuning estimation
+        for (int iBPS = 0; iBPS < nBPS; ++iBPS) {
+            sinvalues.push_back(sin(2*M_PI*(iBPS*1.0/nBPS)));
+            cosvalues.push_back(cos(2*M_PI*(iBPS*1.0/nBPS)));
+        }
+    
+        
+        // make hamming window of length 1/2 octave
+        int hamwinlength = nBPS * 6 + 1;
+        float hamwinsum = 0;
+        for (int i = 0; i < hamwinlength; ++i) { 
+            hw.push_back(0.54 - 0.46 * cos((2*M_PI*i)/(hamwinlength-1)));    
+            hamwinsum += 0.54 - 0.46 * cos((2*M_PI*i)/(hamwinlength-1));
+        }
+        for (int i = 0; i < hamwinlength; ++i) hw[i] = hw[i] / hamwinsum;
+    
+    
+        // initialise the tuning
+        for (int iBPS = 0; iBPS < nBPS; ++iBPS) {
+            meanTunings.push_back(0);
+            localTunings.push_back(0);
+        }
+        
+        blockSize = blockSize;
+        frameCount = 0;
+        int tempn = nNote * blockSize/2;
+        // cerr << "length of tempkernel : " <<  tempn << endl;
+        float *tempkernel;
+
+        tempkernel = new float[tempn];
+
+        logFreqMatrix(inputSampleRate, blockSize, tempkernel);
+        kernelValue.clear();
+        kernelFftIndex.clear();
+        kernelNoteIndex.clear();
+        int countNonzero = 0;
+        for (int iNote = 0; iNote < nNote; ++iNote) { 
+            // I don't know if this is wise: manually making a sparse matrix
+            for (int iFFT = 0; iFFT < static_cast<int>(blockSize/2); ++iFFT) {
+                if (tempkernel[iFFT + blockSize/2 * iNote] > 0) {
+                    kernelValue.push_back(tempkernel[iFFT + blockSize/2 * iNote]);
+                    if (tempkernel[iFFT + blockSize/2 * iNote] > 0) {
+                        countNonzero++;
+                    }
+                    kernelFftIndex.push_back(iFFT);
+                    kernelNoteIndex.push_back(iNote);
+                }
+            }
+        }
+        delete [] tempkernel;
+
+        return true;
+    }    
+};
+
+
+/* --------------------------------- */
+/* ----- SONG PARTITIONER ---------- */
+/* --------------------------------- */
+
+
+/* --- ATTRIBUTES --- */
+
+float Segmentino::m_stepSecs = 0.01161;            // 512 samples at 44100
+int Segmentino::m_chromaFramesizeFactor = 16;   // 16 times as long as beat tracker's
+int Segmentino::m_chromaStepsizeFactor = 4;     // 4 times as long as beat tracker's
+
+
+/* --- METHODS --- */
+
+/* --- Constructor --- */
+Segmentino::Segmentino(float inputSampleRate) :
+    Vamp::Plugin(inputSampleRate),
+    m_d(0),
+    m_chromadata(0),
+    m_bpb(4),
+    m_pluginFrameCount(0)
+{
+}
+
+
+/* --- Desctructor --- */
+Segmentino::~Segmentino()
+{
+    delete m_d;
+    delete m_chromadata;
+}
+
+
+/* --- Methods --- */
+string Segmentino::getIdentifier() const
+{
+    return "qm-songpartitioner";
+}
+
+string Segmentino::getName() const
+{
+    return "Song Partitioner";
+}
+
+string Segmentino::getDescription() const
+{
+    return "Estimate contiguous segments pertaining to song parts such as verse and chorus.";
+}
+
+string Segmentino::getMaker() const
+{
+    return "Queen Mary, University of London";
+}
+
+int Segmentino::getPluginVersion() const
+{
+    return 2;
+}
+
+string Segmentino::getCopyright() const
+{
+    return "Plugin by Matthew Davies, Christian Landone, Chris Cannam, Matthias Mauch and Massimiliano Zanoni  Copyright (c) 2006-2012 QMUL - All Rights Reserved";
+}
+
+Segmentino::ParameterList Segmentino::getParameterDescriptors() const
+{
+    ParameterList list;
+
+    ParameterDescriptor desc;
+
+    // desc.identifier = "bpb";
+    // desc.name = "Beats per Bar";
+    // desc.description = "The number of beats in each bar";
+    // desc.minValue = 2;
+    // desc.maxValue = 16;
+    // desc.defaultValue = 4;
+    // desc.isQuantized = true;
+    // desc.quantizeStep = 1;
+    // list.push_back(desc);
+
+    return list;
+}
+
+float Segmentino::getParameter(std::string name) const
+{
+    if (name == "bpb") return m_bpb;
+    return 0.0;
+}
+
+void Segmentino::setParameter(std::string name, float value)
+{
+    if (name == "bpb") m_bpb = lrintf(value);
+}
+
+
+// Return the StepSize for Chroma Extractor 
+size_t Segmentino::getPreferredStepSize() const
+{
+    size_t step = size_t(m_inputSampleRate * m_stepSecs + 0.0001);
+    if (step < 1) step = 1;
+
+    return step;
+}
+
+// Return the BlockSize for Chroma Extractor 
+size_t Segmentino::getPreferredBlockSize() const
+{
+    size_t theoretical = getPreferredStepSize() * 2;
+    theoretical *= m_chromaFramesizeFactor; 
+
+    return theoretical;
+}
+
+
+// Initialize the plugin and define Beat Tracker and Chroma Extractor Objects
+bool Segmentino::initialise(size_t channels, size_t stepSize, size_t blockSize)
+{
+    if (m_d) {
+        delete m_d;
+        m_d = 0;
+    }
+    if (m_chromadata) {
+        delete m_chromadata;
+        m_chromadata = 0;
+    }
+
+    if (channels < getMinChannelCount() ||
+        channels > getMaxChannelCount()) {
+        std::cerr << "Segmentino::initialise: Unsupported channel count: "
+                  << channels << std::endl;
+        return false;
+    }
+
+    if (stepSize != getPreferredStepSize()) {
+        std::cerr << "ERROR: Segmentino::initialise: Unsupported step size for this sample rate: "
+                  << stepSize << " (wanted " << (getPreferredStepSize()) << ")" << std::endl;
+        return false;
+    }
+
+    if (blockSize != getPreferredBlockSize()) {
+        std::cerr << "WARNING: Segmentino::initialise: Sub-optimal block size for this sample rate: "
+                  << blockSize << " (wanted " << getPreferredBlockSize() << ")" << std::endl;
+    }
+
+    // Beat tracker and Chroma extractor has two different configuration parameters 
+    
+    // Configuration Parameters for Beat Tracker
+    DFConfig dfConfig;
+    dfConfig.DFType = DF_COMPLEXSD;
+    dfConfig.stepSize = stepSize;
+    dfConfig.frameLength = blockSize / m_chromaFramesizeFactor;
+    dfConfig.dbRise = 3;
+    dfConfig.adaptiveWhitening = false;
+    dfConfig.whiteningRelaxCoeff = -1;
+    dfConfig.whiteningFloor = -1;
+    
+    // Initialise Beat Tracker
+    m_d = new BeatTrackerData(m_inputSampleRate, dfConfig);
+    m_d->downBeat->setBeatsPerBar(m_bpb);
+    
+    // Initialise Chroma Extractor
+    m_chromadata = new ChromaData(m_inputSampleRate, blockSize);
+    m_chromadata->initialise();
+    
+    return true;
+}
+
+void Segmentino::reset()
+{
+    if (m_d) m_d->reset();
+    if (m_chromadata) m_chromadata->reset();
+    m_pluginFrameCount = 0;
+}
+
+Segmentino::OutputList Segmentino::getOutputDescriptors() const
+{
+    OutputList list;
+    int outputCounter = 0;
+
+    OutputDescriptor beat;
+    beat.identifier = "beats";
+    beat.name = "Beats";
+    beat.description = "Beat locations labelled with metrical position";
+    beat.unit = "";
+    beat.hasFixedBinCount = true;
+    beat.binCount = 0;
+    beat.sampleType = OutputDescriptor::VariableSampleRate;
+    beat.sampleRate = 1.0 / m_stepSecs;
+    m_beatOutputNumber = outputCounter++;
+
+    OutputDescriptor bars;
+    bars.identifier = "bars";
+    bars.name = "Bars";
+    bars.description = "Bar locations";
+    bars.unit = "";
+    bars.hasFixedBinCount = true;
+    bars.binCount = 0;
+    bars.sampleType = OutputDescriptor::VariableSampleRate;
+    bars.sampleRate = 1.0 / m_stepSecs;
+    m_barsOutputNumber = outputCounter++;
+
+    OutputDescriptor beatcounts;
+    beatcounts.identifier = "beatcounts";
+    beatcounts.name = "Beat Count";
+    beatcounts.description = "Beat counter function";
+    beatcounts.unit = "";
+    beatcounts.hasFixedBinCount = true;
+    beatcounts.binCount = 1;
+    beatcounts.sampleType = OutputDescriptor::VariableSampleRate;
+    beatcounts.sampleRate = 1.0 / m_stepSecs;
+    m_beatcountsOutputNumber = outputCounter++;
+
+    OutputDescriptor beatsd;
+    beatsd.identifier = "beatsd";
+    beatsd.name = "Beat Spectral Difference";
+    beatsd.description = "Beat spectral difference function used for bar-line detection";
+    beatsd.unit = "";
+    beatsd.hasFixedBinCount = true;
+    beatsd.binCount = 1;
+    beatsd.sampleType = OutputDescriptor::VariableSampleRate;
+    beatsd.sampleRate = 1.0 / m_stepSecs;
+    m_beatsdOutputNumber = outputCounter++;
+    
+    OutputDescriptor logscalespec;
+    logscalespec.identifier = "logscalespec";
+    logscalespec.name = "Log-Frequency Spectrum";
+    logscalespec.description = "Spectrum with linear frequency on a log scale.";
+    logscalespec.unit = "";
+    logscalespec.hasFixedBinCount = true;
+    logscalespec.binCount = nNote;
+    logscalespec.hasKnownExtents = false;
+    logscalespec.isQuantized = false;
+    logscalespec.sampleType = OutputDescriptor::FixedSampleRate;
+    logscalespec.hasDuration = false;
+    logscalespec.sampleRate = m_inputSampleRate/2048;
+    m_logscalespecOutputNumber = outputCounter++;
+    
+    OutputDescriptor bothchroma;
+    bothchroma.identifier = "bothchroma";
+    bothchroma.name = "Chromagram and Bass Chromagram";
+    bothchroma.description = "Tuning-adjusted chromagram and bass chromagram (stacked on top of each other) from NNLS approximate transcription.";
+    bothchroma.unit = "";
+    bothchroma.hasFixedBinCount = true;
+    bothchroma.binCount = 24;
+    bothchroma.hasKnownExtents = false;
+    bothchroma.isQuantized = false;
+    bothchroma.sampleType = OutputDescriptor::FixedSampleRate;
+    bothchroma.hasDuration = false;
+    bothchroma.sampleRate = m_inputSampleRate/2048;
+    m_bothchromaOutputNumber = outputCounter++;
+    
+    OutputDescriptor qchromafw;
+    qchromafw.identifier = "qchromafw";
+    qchromafw.name = "Pseudo-Quantised Chromagram and Bass Chromagram";
+    qchromafw.description = "Pseudo-Quantised Chromagram and Bass Chromagram (frames between two beats are identical).";
+    qchromafw.unit = "";
+    qchromafw.hasFixedBinCount = true;
+    qchromafw.binCount = 24;
+    qchromafw.hasKnownExtents = false;
+    qchromafw.isQuantized = false;
+    qchromafw.sampleType = OutputDescriptor::FixedSampleRate;
+    qchromafw.hasDuration = false;
+    qchromafw.sampleRate = m_inputSampleRate/2048;
+    m_qchromafwOutputNumber = outputCounter++;    
+    
+    OutputDescriptor qchroma;
+    qchroma.identifier = "qchroma";
+    qchroma.name = "Quantised Chromagram and Bass Chromagram";
+    qchroma.description = "Quantised Chromagram and Bass Chromagram.";
+    qchroma.unit = "";
+    qchroma.hasFixedBinCount = true;
+    qchroma.binCount = 24;
+    qchroma.hasKnownExtents = false;
+    qchroma.isQuantized = false;
+    qchroma.sampleType = OutputDescriptor::FixedSampleRate;
+    qchroma.hasDuration = true;
+    qchroma.sampleRate = m_inputSampleRate/2048;
+    m_qchromaOutputNumber = outputCounter++;
+
+    OutputDescriptor segm;
+    segm.identifier = "segmentation";
+    segm.name = "Segmentation";
+    segm.description = "Segmentation";
+    segm.unit = "segment-type";
+    segm.hasFixedBinCount = true;
+    //segm.binCount = 24;
+    segm.binCount = 1;
+    segm.hasKnownExtents = true;
+    segm.minValue = 1;
+    segm.maxValue = 5;
+    segm.isQuantized = true;
+    segm.quantizeStep = 1;
+    segm.sampleType = OutputDescriptor::VariableSampleRate;
+    segm.sampleRate = 1.0 / m_stepSecs;
+    segm.hasDuration = true;
+    m_segmOutputNumber = outputCounter++;
+    
+    
+   /* 
+    OutputList list;
+    OutputDescriptor segmentation;
+    segmentation.identifier = "segmentation";
+    segmentation.name = "Segmentation";
+    segmentation.description = "Segmentation";
+    segmentation.unit = "segment-type";
+    segmentation.hasFixedBinCount = true;
+    segmentation.binCount = 1;
+    segmentation.hasKnownExtents = true;
+    segmentation.minValue = 1;
+    segmentation.maxValue = nSegmentTypes;
+    segmentation.isQuantized = true;
+    segmentation.quantizeStep = 1;
+    segmentation.sampleType = OutputDescriptor::VariableSampleRate;
+    segmentation.sampleRate = m_inputSampleRate / getPreferredStepSize();
+    list.push_back(segmentation);
+    return list;
+    */
+    
+    
+    list.push_back(beat);
+    list.push_back(bars);
+    list.push_back(beatcounts);
+    list.push_back(beatsd);
+    list.push_back(logscalespec);
+    list.push_back(bothchroma);
+    list.push_back(qchromafw);
+    list.push_back(qchroma);
+    list.push_back(segm);
+
+    return list;
+}
+
+// Executed for each frame - called from the host  
+
+// We use time domain input, because DownBeat requires it -- so we
+// use the time-domain version of DetectionFunction::process which
+// does its own FFT.  It requires doubles as input, so we need to
+// make a temporary copy
+
+// We only support a single input channel
+Segmentino::FeatureSet Segmentino::process(const float *const *inputBuffers,Vamp::RealTime timestamp)
+{
+    if (!m_d) {
+        cerr << "ERROR: Segmentino::process: "
+             << "Segmentino has not been initialised"
+             << endl;
+        return FeatureSet();
+    }
+
+    const int fl = m_d->dfConfig.frameLength;
+#ifndef __GNUC__
+    double *dfinput = (double *)alloca(fl * sizeof(double));
+#else
+    double dfinput[fl];
+#endif
+    int sampleOffset = ((m_chromaFramesizeFactor-1) * fl) / 2;
+    
+    // Since chroma needs a much longer frame size, we only ever use the very
+    // beginning of the frame for beat tracking.
+    for (int i = 0; i < fl; ++i) dfinput[i] = inputBuffers[0][i];
+    double output = m_d->df->process(dfinput);
+
+    if (m_d->dfOutput.empty()) m_d->origin = timestamp;
+
+//    std::cerr << "df[" << m_d->dfOutput.size() << "] is " << output << std::endl;
+    m_d->dfOutput.push_back(output);
+
+    // Downsample and store the incoming audio block.
+    // We have an overlap on the incoming audio stream (step size is
+    // half block size) -- this function is configured to take only a
+    // step size's worth, so effectively ignoring the overlap.  Note
+    // however that this means we omit the last blocksize - stepsize
+    // samples completely for the purposes of barline detection
+    // (hopefully not a problem)
+    m_d->downBeat->pushAudioBlock(inputBuffers[0]);
+
+    // The following is not done every time, but only every m_chromaFramesizeFactor times,
+    // because the chroma does not need dense time frames.
+    
+    if (m_pluginFrameCount % m_chromaStepsizeFactor == 0)
+    {    
+        
+        // Window the full time domain, data, FFT it and process chroma stuff.
+    
+        #ifndef __GNUC__
+            float *windowedBuffers = (float *)alloca(m_chromadata->blockSize * sizeof(float));
+        #else
+            float windowedBuffers[m_chromadata->blockSize];
+        #endif
+        m_chromadata->window.cut(&inputBuffers[0][0], &windowedBuffers[0]);
+    
+        // adjust timestamp (we want the middle of the frame)
+        timestamp = timestamp + Vamp::RealTime::frame2RealTime(sampleOffset, lrintf(m_inputSampleRate));
+
+        m_chromadata->baseProcess(&windowedBuffers[0], timestamp);
+        
+    }
+    m_pluginFrameCount++;
+    
+    FeatureSet fs;
+    fs[m_logscalespecOutputNumber].push_back(
+        m_chromadata->logSpectrum.back());
+    return fs;
+}
+
+Segmentino::FeatureSet Segmentino::getRemainingFeatures()
+{
+    if (!m_d) {
+        cerr << "ERROR: Segmentino::getRemainingFeatures: "
+             << "Segmentino has not been initialised"
+             << endl;
+        return FeatureSet();
+    }
+
+    FeatureSet masterFeatureset = beatTrack();
+    Vamp::RealTime last_beattime = masterFeatureset[m_beatOutputNumber][masterFeatureset[m_beatOutputNumber].size()-1].timestamp;
+    masterFeatureset[m_beatOutputNumber].clear();
+    Vamp::RealTime beattime = Vamp::RealTime::fromSeconds(1.0);
+    while (beattime < last_beattime)
+    {
+        Feature beatfeature;
+        beatfeature.hasTimestamp = true;
+        beatfeature.timestamp = beattime;
+        masterFeatureset[m_beatOutputNumber].push_back(beatfeature);
+        beattime = beattime + Vamp::RealTime::fromSeconds(0.5);
+    }
+    
+    
+    FeatureList chromaList = chromaFeatures();
+    
+    for (int i = 0; i < (int)chromaList.size(); ++i)
+    {
+        masterFeatureset[m_bothchromaOutputNumber].push_back(chromaList[i]);
+    }
+    
+    // quantised and pseudo-quantised (beat-wise) chroma
+    std::vector<FeatureList> quantisedChroma = beatQuantiser(chromaList, masterFeatureset[m_beatOutputNumber]);
+
+    if (quantisedChroma.empty()) return masterFeatureset;
+    
+    masterFeatureset[m_qchromafwOutputNumber] = quantisedChroma[0];
+    masterFeatureset[m_qchromaOutputNumber] = quantisedChroma[1];
+    
+    // Segmentation
+    try {
+        masterFeatureset[m_segmOutputNumber] = runSegmenter(quantisedChroma[1]);
+    } catch (std::bad_alloc &a) {
+        cerr << "ERROR: Segmentino::getRemainingFeatures: Failed to run segmenter, not enough memory (song too long?)" << endl;
+    }
+    
+    return(masterFeatureset);
+}
+
+/* ------ Beat Tracker ------ */
+
+Segmentino::FeatureSet Segmentino::beatTrack()
+{
+    vector<double> df;
+    vector<double> beatPeriod;
+    vector<double> tempi;
+    
+    for (int i = 2; i < (int)m_d->dfOutput.size(); ++i) { // discard first two elts
+        df.push_back(m_d->dfOutput[i]);
+        beatPeriod.push_back(0.0);
+    }
+    if (df.empty()) return FeatureSet();
+
+    TempoTrackV2 tt(m_inputSampleRate, m_d->dfConfig.stepSize);
+    tt.calculateBeatPeriod(df, beatPeriod, tempi);
+
+    vector<double> beats;
+    tt.calculateBeats(df, beatPeriod, beats);
+
+    vector<int> downbeats;
+    size_t downLength = 0;
+    const float *downsampled = m_d->downBeat->getBufferedAudio(downLength);
+    m_d->downBeat->findDownBeats(downsampled, downLength, beats, downbeats);
+
+    vector<double> beatsd;
+    m_d->downBeat->getBeatSD(beatsd);
+    
+    /*std::cout << "BeatTracker: found downbeats at: ";
+    for (int i = 0; i < downbeats.size(); ++i) std::cout << downbeats[i] << " " << std::endl;*/
+    
+    FeatureSet returnFeatures;
+
+    char label[20];
+
+    int dbi = 0;
+    int beat = 0;
+    int bar = 0;
+
+    if (!downbeats.empty()) {
+        // get the right number for the first beat; this will be
+        // incremented before use (at top of the following loop)
+        int firstDown = downbeats[0];
+        beat = m_bpb - firstDown - 1;
+        if (beat == m_bpb) beat = 0;
+    }
+
+    for (int i = 0; i < (int)beats.size(); ++i) {
+        
+        int frame = beats[i] * m_d->dfConfig.stepSize;
+        
+        if (dbi < (int)downbeats.size() && i == downbeats[dbi]) {
+            beat = 0;
+            ++bar;
+            ++dbi;
+        } else {
+            ++beat;
+        }
+        
+        /* Ooutput Section */
+        
+        // outputs are:
+        //
+        // 0 -> beats
+        // 1 -> bars
+        // 2 -> beat counter function
+        
+        Feature feature;
+        feature.hasTimestamp = true;
+        feature.timestamp = m_d->origin + Vamp::RealTime::frame2RealTime (frame, lrintf(m_inputSampleRate));
+        
+        sprintf(label, "%d", beat + 1);
+        feature.label = label;
+        returnFeatures[m_beatOutputNumber].push_back(feature);          // labelled beats
+        
+        feature.values.push_back(beat + 1);
+        returnFeatures[m_beatcountsOutputNumber].push_back(feature);    // beat function
+        
+        if (i > 0 && i <= (int)beatsd.size()) {
+            feature.values.clear();
+            feature.values.push_back(beatsd[i-1]);
+            feature.label = "";
+            returnFeatures[m_beatsdOutputNumber].push_back(feature);    // beat spectral difference
+        }
+        
+        if (beat == 0) {
+            feature.values.clear();
+            sprintf(label, "%d", bar);
+            feature.label = label;
+            returnFeatures[m_barsOutputNumber].push_back(feature);      // bars
+        }
+    }
+
+    return returnFeatures;
+}
+
+
+/* ------ Chroma Extractor ------ */
+
+Segmentino::FeatureList Segmentino::chromaFeatures()
+{
+        
+    FeatureList returnFeatureList;
+    FeatureList tunedlogfreqspec;
+    
+    if (m_chromadata->logSpectrum.size() == 0) return returnFeatureList;
+
+    /**  Calculate Tuning
+         calculate tuning from (using the angle of the complex number defined by the 
+         cumulative mean real and imag values)
+    **/
+    float meanTuningImag = 0;
+    float meanTuningReal = 0;
+    for (int iBPS = 0; iBPS < nBPS; ++iBPS) {
+        meanTuningReal += m_chromadata->meanTunings[iBPS] * m_chromadata->cosvalues[iBPS];
+        meanTuningImag += m_chromadata->meanTunings[iBPS] * m_chromadata->sinvalues[iBPS];
+    }
+    float cumulativetuning = 440 * pow(2,atan2(meanTuningImag, meanTuningReal)/(24*M_PI));
+    float normalisedtuning = atan2(meanTuningImag, meanTuningReal)/(2*M_PI);
+    int intShift = floor(normalisedtuning * 3);
+    float floatShift = normalisedtuning * 3 - intShift; // floatShift is a really bad name for this
+     
+    char buffer0 [50];
+ 
+    sprintf(buffer0, "estimated tuning: %0.1f Hz", cumulativetuning);
+                 
+    /** Tune Log-Frequency Spectrogram
+        calculate a tuned log-frequency spectrogram (f2): use the tuning estimated above (kinda f0) to 
+        perform linear interpolation on the existing log-frequency spectrogram (kinda f1).
+    **/
+    cerr << endl << "[NNLS Chroma Plugin] Tuning Log-Frequency Spectrogram ... ";
+             
+    float tempValue = 0;
+
+    int count = 0;
+    
+    for (FeatureList::iterator i = m_chromadata->logSpectrum.begin(); i != m_chromadata->logSpectrum.end(); ++i) 
+    {
+        
+        Feature f1 = *i;
+        Feature f2; // tuned log-frequency spectrum
+        
+        f2.hasTimestamp = true;
+        f2.timestamp = f1.timestamp;
+        
+        f2.values.push_back(0.0); 
+        f2.values.push_back(0.0); // set lower edge to zero
+
+        if (m_chromadata->tuneLocal) {
+            intShift = floor(m_chromadata->localTuning[count] * 3);
+            floatShift = m_chromadata->localTuning[count] * 3 - intShift; 
+            // floatShift is a really bad name for this
+        }
+
+        for (int k = 2; k < (int)f1.values.size() - 3; ++k) 
+        { // interpolate all inner bins
+            tempValue = f1.values[k + intShift] * (1-floatShift) + f1.values[k+intShift+1] * floatShift;
+            f2.values.push_back(tempValue);
+        }
+         
+        f2.values.push_back(0.0); 
+        f2.values.push_back(0.0); 
+        f2.values.push_back(0.0); // upper edge
+
+        vector<float> runningmean = SpecialConvolution(f2.values,m_chromadata->hw);
+        vector<float> runningstd;
+        for (int i = 0; i < nNote; i++) { // first step: squared values into vector (variance)
+            runningstd.push_back((f2.values[i] - runningmean[i]) * (f2.values[i] - runningmean[i]));
+        }
+        runningstd = SpecialConvolution(runningstd,m_chromadata->hw); // second step convolve
+        for (int i = 0; i < nNote; i++) 
+        { 
+            
+            runningstd[i] = sqrt(runningstd[i]); 
+            // square root to finally have running std
+            
+            if (runningstd[i] > 0) 
+            {
+                f2.values[i] = (f2.values[i] - runningmean[i]) > 0 ?
+                    (f2.values[i] - runningmean[i]) / pow(runningstd[i],m_chromadata->whitening) : 0;
+            }
+            
+            if (f2.values[i] < 0) {
+                
+                cerr << "ERROR: negative value in logfreq spectrum" << endl;
+                
+            }
+        }
+        tunedlogfreqspec.push_back(f2);
+        count++;
+    }
+    cerr << "done." << endl;    
+    /** Semitone spectrum and chromagrams
+        Semitone-spaced log-frequency spectrum derived 
+        from the tuned log-freq spectrum above. the spectrum
+        is inferred using a non-negative least squares algorithm.
+        Three different kinds of chromagram are calculated, "treble", "bass", and "both" (which means 
+        bass and treble stacked onto each other).
+    **/
+    if (m_chromadata->useNNLS == 0) {
+        cerr << "[NNLS Chroma Plugin] Mapping to semitone spectrum and chroma ... ";
+    } else {
+        cerr << "[NNLS Chroma Plugin] Performing NNLS and mapping to chroma ... ";
+    }
+    
+    vector<float> oldchroma = vector<float>(12,0);
+    vector<float> oldbasschroma = vector<float>(12,0);
+    count = 0;
+
+    for (FeatureList::iterator it = tunedlogfreqspec.begin(); it != tunedlogfreqspec.end(); ++it) {
+        Feature logfreqsp = *it; // logfreq spectrum
+        Feature bothchroma; // treble and bass chromagram
+                            
+        bothchroma.hasTimestamp = true;
+        bothchroma.timestamp = logfreqsp.timestamp;
+        
+        float b[nNote];
+
+        bool some_b_greater_zero = false;
+        float sumb = 0;
+        for (int i = 0; i < nNote; i++) {
+            b[i] = logfreqsp.values[i];
+            sumb += b[i];
+            if (b[i] > 0) {
+                some_b_greater_zero = true;
+            }            
+        }
+    
+        // here's where the non-negative least squares algorithm calculates the note activation x
+
+        vector<float> chroma = vector<float>(12, 0);
+        vector<float> basschroma = vector<float>(12, 0);
+        float currval;
+        int iSemitone = 0;
+     
+        if (some_b_greater_zero) {
+            if (m_chromadata->useNNLS == 0) {
+                for (int iNote = nBPS/2 + 2; iNote < nNote - nBPS/2; iNote += nBPS) {
+                    currval = 0;
+                    for (int iBPS = -nBPS/2; iBPS < nBPS/2+1; ++iBPS) {
+                        currval += b[iNote + iBPS] * (1-abs(iBPS*1.0/(nBPS/2+1)));                       
+                    }
+                    chroma[iSemitone % 12] += currval * treblewindow[iSemitone];
+                    basschroma[iSemitone % 12] += currval * basswindow[iSemitone];
+                    iSemitone++;
+                }
+         
+            } else {
+                float x[84+1000];
+                for (int i = 1; i < 1084; ++i) x[i] = 1.0;
+                vector<int> signifIndex;
+                int index=0;
+                sumb /= 84.0;
+                for (int iNote = nBPS/2 + 2; iNote < nNote - nBPS/2; iNote += nBPS) {
+                    float currval = 0;
+                    for (int iBPS = -nBPS/2; iBPS < nBPS/2+1; ++iBPS) {
+                        currval += b[iNote + iBPS]; 
+                    }
+                    if (currval > 0) signifIndex.push_back(index);
+                    index++;
+                }
+                float rnorm;
+                float w[84+1000];
+                float zz[84+1000];
+                int indx[84+1000];
+                int mode;
+                int dictsize = nNote*signifIndex.size();
+
+                float *curr_dict = new float[dictsize];
+                for (int iNote = 0; iNote < (int)signifIndex.size(); ++iNote) {
+                    for (int iBin = 0; iBin < nNote; iBin++) {
+                        curr_dict[iNote * nNote + iBin] = 
+                            1.0 * m_chromadata->dict[signifIndex[iNote] * nNote + iBin];
+                    }
+                }
+                nnls(curr_dict, nNote, nNote, signifIndex.size(), b, x, &rnorm, w, zz, indx, &mode);
+                delete [] curr_dict;
+                for (int iNote = 0; iNote < (int)signifIndex.size(); ++iNote) {
+                    // cerr << mode << endl;
+                    chroma[signifIndex[iNote] % 12] += x[iNote] * treblewindow[signifIndex[iNote]];
+                    basschroma[signifIndex[iNote] % 12] += x[iNote] * basswindow[signifIndex[iNote]];
+                }
+            }    
+        }
+ 
+        chroma.insert(chroma.begin(), basschroma.begin(), basschroma.end()); 
+        // just stack the both chromas 
+        
+        bothchroma.values = chroma; 
+        returnFeatureList.push_back(bothchroma);
+        count++;
+    }
+    cerr << "done." << endl;
+
+    return returnFeatureList;     
+}
+
+/* ------ Beat Quantizer ------ */
+
+std::vector<Vamp::Plugin::FeatureList>
+Segmentino::beatQuantiser(Vamp::Plugin::FeatureList chromagram, Vamp::Plugin::FeatureList beats)
+{
+    std::vector<FeatureList> returnVector;
+    
+    FeatureList fwQchromagram; // frame-wise beat-quantised chroma
+    FeatureList bwQchromagram; // beat-wise beat-quantised chroma
+
+
+    size_t nChromaFrame = chromagram.size();
+    size_t nBeat = beats.size();
+    
+    if (nBeat == 0 && nChromaFrame == 0) return returnVector;
+    
+    int nBin = chromagram[0].values.size();
+    
+    vector<float> tempChroma = vector<float>(nBin);
+    
+    Vamp::RealTime beatTimestamp = Vamp::RealTime::zeroTime;
+    int currBeatCount = -1; // start before first beat
+    int framesInBeat = 0;
+    
+    for (size_t iChroma = 0; iChroma < nChromaFrame; ++iChroma)
+    {
+        Vamp::RealTime frameTimestamp = chromagram[iChroma].timestamp;
+        Vamp::RealTime newBeatTimestamp;
+                
+        if (currBeatCount != (int)beats.size() - 1) {
+            newBeatTimestamp = beats[currBeatCount+1].timestamp;
+        } else {
+            newBeatTimestamp = chromagram[nChromaFrame-1].timestamp;
+        }
+                
+        if (frameTimestamp > newBeatTimestamp ||
+            iChroma == nChromaFrame-1)
+        {
+            // new beat (or last chroma frame)
+            // 1. finish all the old beat processing
+            if (framesInBeat > 0)
+            {
+                for (int i = 0; i < nBin; ++i) tempChroma[i] /= framesInBeat; // average
+            }
+            
+            Feature bwQchromaFrame;
+            bwQchromaFrame.hasTimestamp = true;
+            bwQchromaFrame.timestamp = beatTimestamp;
+            bwQchromaFrame.values = tempChroma;
+            bwQchromaFrame.duration = newBeatTimestamp - beatTimestamp;
+            bwQchromagram.push_back(bwQchromaFrame);
+            
+            for (int iFrame = -framesInBeat; iFrame < 0; ++iFrame)
+            {
+                Feature fwQchromaFrame;
+                fwQchromaFrame.hasTimestamp = true;
+                fwQchromaFrame.timestamp = chromagram[iChroma+iFrame].timestamp;
+                fwQchromaFrame.values = tempChroma; // all between two beats get the same
+                fwQchromagram.push_back(fwQchromaFrame);
+            }
+            
+            // 2. increments / resets for current (new) beat
+            currBeatCount++;
+            beatTimestamp = newBeatTimestamp;
+            for (int i = 0; i < nBin; ++i) tempChroma[i] = 0; // average
+            framesInBeat = 0;
+        }
+        framesInBeat++;
+        for (int i = 0; i < nBin; ++i) tempChroma[i] += chromagram[iChroma].values[i];
+    }
+    returnVector.push_back(fwQchromagram);
+    returnVector.push_back(bwQchromagram);
+    return returnVector;
+}
+
+
+
+/* -------------------------------- */
+/* ------ Support Functions  ------ */
+/* -------------------------------- */
+
+// one-dimesion median filter
+arma::vec medfilt1(arma::vec v, int medfilt_length)
+{    
+    // TODO: check if this works with odd and even medfilt_length !!!
+    int halfWin = medfilt_length/2;
+    
+    // result vector
+    arma::vec res = arma::zeros<arma::vec>(v.size());
+    
+    // padding 
+    arma::vec padV = arma::zeros<arma::vec>(v.size()+medfilt_length-1);
+    
+    for (int i=medfilt_length/2; i < medfilt_length/2+(int)v.size(); ++ i)
+    {
+        padV(i) = v(i-medfilt_length/2);
+    }
+    
+    // the above loop leaves the boundaries at 0, 
+    // the two loops below fill them with the start or end values of v at start and end
+    for (int i = 0; i < halfWin; ++i) padV(i) = v(0);
+    for (int i = halfWin+(int)v.size(); i < (int)v.size()+2*halfWin; ++i) padV(i) = v(v.size()-1);
+    
+    
+    
+    // Median filter
+    arma::vec win = arma::zeros<arma::vec>(medfilt_length);
+    
+    for (int i=0; i < (int)v.size(); ++i)
+    {
+        win = padV.subvec(i,i+halfWin*2);
+        win = sort(win);
+        res(i) = win(halfWin);
+    }
+    
+    return res;
+}
+
+
+// Quantile
+double quantile(arma::vec v, double p)
+{
+    arma::vec sortV = arma::sort(v);
+    int n = sortV.size();
+    arma::vec x = arma::zeros<vec>(n+2);
+    arma::vec y = arma::zeros<vec>(n+2);
+    
+    x(0) = 0;
+    x(n+1) = 100; 
+    
+    for (int i=1; i<n+1; ++i)
+        x(i) = 100*(0.5+(i-1))/n;
+        
+    y(0) = sortV(0);
+    y.subvec(1,n) = sortV;
+    y(n+1) = sortV(n-1);
+    
+    arma::uvec x2index = find(x>=p*100);
+    
+    // Interpolation
+    double x1 = x(x2index(0)-1);
+    double x2 = x(x2index(0));
+    double y1 = y(x2index(0)-1);
+    double y2 = y(x2index(0));
+    
+    double res = (y2-y1)/(x2-x1)*(p*100-x1)+y1;
+    
+    return res;
+}
+
+// Max Filtering
+arma::mat maxfilt1(arma::mat inmat, int len)
+{
+    arma::mat outmat = inmat;
+    
+    for (int i=0; i < (int)inmat.n_rows; ++i)
+    {
+        if (arma::sum(inmat.row(i)) > 0)
+        {
+            // Take a window of rows
+            int startWin;
+            int endWin;
+            
+            if (0 > i-len)
+                startWin = 0;
+            else
+                startWin = i-len;
+            
+            if ((int)inmat.n_rows-1 < i+len-1)
+                endWin = inmat.n_rows-1;
+            else
+                endWin = i+len-1;
+    
+            outmat(i,span::all) = arma::max(inmat(span(startWin,endWin),span::all));
+        }
+    }
+    
+    return outmat;
+    
+}
+
+// Null Parts
+Part nullpart(vector<Part> parts, arma::vec barline)
+{
+    arma::uvec nullindices = arma::ones<arma::uvec>(barline.size());
+    for (int iPart=0; iPart<(int)parts.size(); ++iPart)
+    {
+        //for (int iIndex=0; iIndex < parts[0].indices.size(); ++iIndex) 
+        for (int iIndex=0; iIndex < (int)parts[iPart].indices.size(); ++iIndex) 
+            for (int i=0; i<parts[iPart].n; ++i) 
+            {
+                int ind = parts[iPart].indices[iIndex]+i;
+                nullindices(ind) = 0;
+            }
+    }
+
+    Part newPart;
+    newPart.n = 1;
+    uvec q = find(nullindices > 0);
+    
+    for (int i=0; i<(int)q.size();++i) 
+        newPart.indices.push_back(q(i));
+
+    newPart.letter = '-';
+    newPart.value = 0;
+    newPart.level = 0;
+    
+    return newPart;    
+}
+
+
+// Merge Nulls
+void mergenulls(vector<Part> &parts)
+{
+    for (int iPart=0; iPart<(int)parts.size(); ++iPart)
+    {
+        
+        vector<Part> newVectorPart;
+        
+        if (parts[iPart].letter.compare("-")==0)
+        {
+            sort (parts[iPart].indices.begin(), parts[iPart].indices.end());
+            int newpartind = -1;
+            
+            vector<int> indices;
+            indices.push_back(-2);
+            
+            for (int iIndex=0; iIndex<(int)parts[iPart].indices.size(); ++iIndex) 
+                indices.push_back(parts[iPart].indices[iIndex]);
+            
+            for (int iInd=1; iInd < (int)indices.size(); ++iInd)
+            { 
+                if (indices[iInd] - indices[iInd-1] > 1)
+                {
+                    newpartind++;
+
+                    Part newPart;
+                    newPart.letter = 'N';
+                    std::stringstream out;
+                    out << newpartind+1;
+                    newPart.letter.append(out.str());
+                    // newPart.value = 20+newpartind+1;
+                    newPart.value = 0;
+                    newPart.n = 1;
+                    newPart.indices.push_back(indices[iInd]);
+                    newPart.level = 0;   
+                    
+                    newVectorPart.push_back(newPart);
+                }
+                else
+                {
+                    newVectorPart[newpartind].n = newVectorPart[newpartind].n+1;
+                }
+            }
+            parts.erase (parts.end());
+            
+            for (int i=0; i<(int)newVectorPart.size(); ++i)
+                parts.push_back(newVectorPart[i]);
+        }
+    }
+}
+
+/* ------ Segmentation ------ */
+
+vector<Part> songSegment(Vamp::Plugin::FeatureList quantisedChromagram)
+{
+    
+    
+    /* ------ Parameters ------ */
+    double thresh_beat = 0.85;
+    double thresh_seg = 0.80;
+    int medfilt_length = 5; 
+    int minlength = 28;
+    int maxlength = 2*128;
+    double quantilePerc = 0.1;
+    /* ------------------------ */
+    
+    
+    // Collect Info
+    int nBeat = quantisedChromagram.size();                      // Number of feature vector
+    int nFeatValues = quantisedChromagram[0].values.size();      // Number of values for each feature vector
+    
+    if (nBeat < minlength) {
+        // return a single part
+        vector<Part> parts;
+        Part newPart;
+        newPart.n = 1;
+        newPart.indices.push_back(0);
+        newPart.letter = "n1";
+        newPart.value = 20;
+        newPart.level = 0;
+        parts.push_back(newPart);
+        return parts;
+    }
+
+    arma::irowvec timeStamp = arma::zeros<arma::imat>(1,nBeat);       // Vector of Time Stamps
+    
+    // Save time stamp as a Vector
+    if (quantisedChromagram[0].hasTimestamp)
+    {
+        for (int i = 0; i < nBeat; ++ i)
+            timeStamp[i] = quantisedChromagram[i].timestamp.nsec;
+    }
+    
+    
+    // Build a ObservationTOFeatures Matrix
+    arma::mat featVal = arma::zeros<mat>(nBeat,nFeatValues/2);
+    
+    for (int i = 0; i < nBeat; ++ i)
+        for (int j = 0; j < nFeatValues/2; ++ j)
+        {
+            featVal(i,j) = 0.8 * quantisedChromagram[i].values[j] + quantisedChromagram[i].values[j+12]; // bass attenuated
+        }
+    
+    // Set to arbitrary value to feature vectors with low std
+    arma::mat a = stddev(featVal,1,1);
+    
+    // Feature Correlation Matrix
+    arma::mat simmat0 = 1-arma::cor(arma::trans(featVal));
+    
+
+    for (int i = 0; i < nBeat; ++ i)
+    {
+        if (a(i)<0.000001)
+        {
+            featVal(i,1) = 1000;  // arbitrary  
+            
+            for (int j = 0; j < nFeatValues/2; ++j)
+            {
+                simmat0(i,j) = 1;
+                simmat0(j,i) = 1;
+            }
+        }
+    }
+    
+    arma::mat simmat = 1-simmat0/2;
+    
+    // -------- To delate when the proble with the add of beat will be solved -------
+    for (int i = 0; i < nBeat; ++ i)
+     for (int j = 0; j < nBeat; ++ j)
+         if (!std::isfinite(simmat(i,j)))
+             simmat(i,j)=0;
+    // ------------------------------------------------------------------------------
+    
+    // Median Filtering applied to the Correlation Matrix
+    // The median filter is for each diagonal of the Matrix
+    arma::mat median_simmat = arma::zeros<arma::mat>(nBeat,nBeat);
+    
+    for (int i = 0; i < nBeat; ++ i)
+    {
+        arma::vec temp = medfilt1(simmat.diag(i),medfilt_length);
+        median_simmat.diag(i) = temp;
+        median_simmat.diag(-i) = temp;
+    }
+
+    for (int i = 0; i < nBeat; ++ i)
+        for (int j = 0; j < nBeat; ++ j)
+            if (!std::isfinite(median_simmat(i,j)))
+                median_simmat(i,j) = 0;
+    
+    // -------------- NOT CONVERTED -------------------------------------    
+    //    if param.seg.standardise
+    //        med_median_simmat = repmat(median(median_simmat),nBeat,1);
+    //    std_median_simmat = repmat(std(median_simmat),nBeat,1);
+    //    median_simmat = (median_simmat - med_median_simmat) ./ std_median_simmat;
+    //    end
+    // --------------------------------------------------------
+    
+    // Retrieve Bar Bounderies
+    arma::uvec dup = find(median_simmat > thresh_beat);
+    arma::mat potential_duplicates = arma::zeros<arma::mat>(nBeat,nBeat);
+    potential_duplicates.elem(dup) = arma::ones<arma::vec>(dup.size());
+    potential_duplicates = trimatu(potential_duplicates);
+    
+    int nPartlengths = round((maxlength-minlength)/4)+1;
+    arma::vec partlengths = zeros<arma::vec>(nPartlengths);
+    
+    for (int i = 0; i < nPartlengths; ++ i)
+        partlengths(i) = (i*4) + minlength;
+    
+    // initialise arrays
+    arma::cube simArray = zeros<arma::cube>(nBeat,nBeat,nPartlengths);
+    arma::cube decisionArray2 = zeros<arma::cube>(nBeat,nBeat,nPartlengths);
+
+    for (int iLength = 0; iLength < nPartlengths; ++ iLength)
+    // for (int iLength = 0; iLength < 20; ++ iLength)
+    {
+        int len = partlengths(iLength);
+        int nUsedBeat = nBeat - len + 1;                   // number of potential rep beginnings: they can't overlap at the end of the song
+
+        if (nUsedBeat < 1) continue;
+        
+        for (int iBeat = 0; iBeat < nUsedBeat; ++ iBeat)   // looping over all columns (arbitrarily chosen columns)
+        {
+            arma::uvec help2 = find(potential_duplicates(span(0,nUsedBeat-1),iBeat)==1);
+            
+            for (int i=0; i < (int)help2.size(); ++i)
+            {
+
+                // measure how well two length len segments go together
+                int kBeat = help2(i);
+                arma::vec distrib = median_simmat(span(iBeat,iBeat+len-1),span(kBeat,kBeat+len-1)).diag(0);
+                simArray(iBeat,kBeat,iLength) = quantile(distrib,quantilePerc);
+            }
+        }
+        
+        arma::mat tempM = simArray(span(0,nUsedBeat-1),span(0,nUsedBeat-1),span(iLength,iLength));
+        simArray.slice(iLength)(span(0,nUsedBeat-1),span(0,nUsedBeat-1)) = tempM + arma::trans(tempM) - (eye<mat>(nUsedBeat,nUsedBeat)%tempM); 
+        
+        // convolution
+        arma::vec K = arma::zeros<vec>(3);
+        K << 0.01 << 0.98 << 0.01;
+        
+        
+        for (int i=0; i < (int)simArray.n_rows; ++i)
+        {
+            arma::rowvec t = arma::conv((arma::rowvec)simArray.slice(iLength).row(i),K);
+            simArray.slice(iLength)(i,span::all) = t.subvec(1,t.size()-2);
+        }
+ 
+        // take only over-average bars that do not overlap
+        
+        arma::mat temp = arma::zeros<mat>(simArray.n_rows, simArray.n_cols);
+        temp(span::all, span(0,nUsedBeat-1)) = simArray.slice(iLength)(span::all,span(0,nUsedBeat-1));
+        
+        for (int i=0; i < (int)temp.n_rows; ++i)
+            for (int j=0; j < nUsedBeat; ++j)
+                if (temp(i,j) < thresh_seg)
+                    temp(i,j) = 0;
+        
+        decisionArray2.slice(iLength) = temp;
+
+        arma::mat maxMat = maxfilt1(decisionArray2.slice(iLength),len-1);
+        
+        for (int i=0; i < (int)decisionArray2.n_rows; ++i)
+            for (int j=0; j < (int)decisionArray2.n_cols; ++j)
+                if (decisionArray2.slice(iLength)(i,j) < maxMat(i,j))
+                    decisionArray2.slice(iLength)(i,j) = 0;
+        
+        decisionArray2.slice(iLength) = decisionArray2.slice(iLength) % arma::trans(decisionArray2.slice(iLength));
+        
+        for (int i=0; i < (int)simArray.n_rows; ++i)
+            for (int j=0; j < (int)simArray.n_cols; ++j)
+                if (simArray.slice(iLength)(i,j) < thresh_seg)
+                    potential_duplicates(i,j) = 0; 
+    }
+    
+    // Milk the data
+    
+    arma::mat bestval;
+    
+    for (int iLength=0; iLength<nPartlengths; ++iLength)
+    {
+        arma::mat temp = arma::zeros<arma::mat>(decisionArray2.n_rows,decisionArray2.n_cols);
+
+       for (int rows=0; rows < (int)decisionArray2.n_rows; ++rows)
+            for (int cols=0; cols < (int)decisionArray2.n_cols; ++cols)
+                if (decisionArray2.slice(iLength)(rows,cols) > 0)
+                    temp(rows,cols) = 1;
+        
+        arma::vec currLogicSum = arma::sum(temp,1);
+        
+        for (int iBeat=0; iBeat < nBeat; ++iBeat)
+            if (currLogicSum(iBeat) > 1)
+            {
+                arma::vec t = decisionArray2.slice(iLength)(span::all,iBeat);
+                double currSum = sum(t);
+                
+                int count = 0;
+                for (int i=0; i < (int)t.size(); ++i)
+                    if (t(i)>0)
+                        count++;
+                
+                currSum = (currSum/count)/2;
+                
+                arma::rowvec t1;
+                t1 << (currLogicSum(iBeat)-1) * partlengths(iLength) << currSum << iLength << iBeat << currLogicSum(iBeat);
+                
+                bestval = join_cols(bestval,t1);
+            }
+    }
+    
+    // Definition of the resulting vector
+    vector<Part> parts;
+    
+    // make a table of all valid sets of parts
+    
+    char partletters[] = {'A','B','C','D','E','F','G', 'H','I','J','K','L','M','N','O','P','Q','R','S'};
+    int partvalues[] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};
+    arma::vec valid_sets = arma::ones<arma::vec>(bestval.n_rows);
+    
+    if (!bestval.is_empty())
+    {
+        
+        // In questo punto viene introdotto un errore alla 3 cifra decimale
+        
+        arma::colvec t = arma::zeros<arma::colvec>(bestval.n_rows);
+        for (int i=0; i < (int)bestval.n_rows; ++i)
+        {
+            t(i) = bestval(i,1)*2;
+        }
+        
+        double m = t.max();
+        
+        bestval(span::all,1) = bestval(span::all,1) / m; 
+        bestval(span::all,0) = bestval(span::all,0) + bestval(span::all,1);
+        
+        arma::mat bestval2;
+        for (int i=0; i < (int)bestval.n_cols; ++i)
+            if (i!=1)
+                bestval2 = join_rows(bestval2,bestval.col(i));
+        
+        for (int kSeg=0; kSeg<6; ++kSeg)
+        {
+            arma::mat currbestvals = arma::zeros<arma::mat>(bestval2.n_rows, bestval2.n_cols);
+            for (int i=0; i < (int)bestval2.n_rows; ++i)
+                for (int j=0; j < (int)bestval2.n_cols; ++j)
+                    if (valid_sets(i))
+                        currbestvals(i,j) = bestval2(i,j);
+            
+            arma::vec t1 = currbestvals.col(0);
+            double ma;
+            uword maIdx;
+            ma = t1.max(maIdx);
+            
+            if ((maIdx == 0)&&(ma == 0))
+                break;
+
+            int bestLength = lrint(partlengths(currbestvals(maIdx,1)));
+            arma::rowvec bestIndices = decisionArray2.slice(currbestvals(maIdx,1))(currbestvals(maIdx,2),span::all);
+                
+            arma::rowvec bestIndicesMap = arma::zeros<arma::rowvec>(bestIndices.size());
+            for (int i=0; i < (int)bestIndices.size(); ++i)
+                if (bestIndices(i)>0)
+                    bestIndicesMap(i) = 1;
+                   
+            arma::rowvec mask = arma::zeros<arma::rowvec>(bestLength*2-1);
+            for (int i=0; i<bestLength; ++i)
+                mask(i+bestLength-1) = 1;
+            
+            arma::rowvec t2 = arma::conv(bestIndicesMap,mask); 
+            arma::rowvec island = t2.subvec(mask.size()/2,t2.size()-1-mask.size()/2);
+            
+            // Save results in the structure
+            Part newPart;
+            newPart.n = bestLength;
+            uvec q1 = find(bestIndices > 0);
+            
+            for (int i=0; i < (int)q1.size();++i)
+                newPart.indices.push_back(q1(i));
+            
+            newPart.letter = partletters[kSeg];
+            newPart.value = partvalues[kSeg];
+            newPart.level = kSeg+1;
+            parts.push_back(newPart);
+            
+            uvec q2 = find(valid_sets==1);
+            
+            for (int i=0; i < (int)q2.size(); ++i)
+            {
+                int iSet = q2(i);
+                int s = partlengths(bestval2(iSet,1));
+                
+                arma::rowvec mask1 = arma::zeros<arma::rowvec>(s*2-1);
+                for (int i=0; i<s; ++i)
+                    mask1(i+s-1) = 1;
+                
+                arma::rowvec Ind = decisionArray2.slice(bestval2(iSet,1))(bestval2(iSet,2),span::all);
+                arma::rowvec IndMap = arma::zeros<arma::rowvec>(Ind.size());
+                for (int i=0; i < (int)Ind.size(); ++i)
+                    if (Ind(i)>0)
+                        IndMap(i) = 2;
+                
+                arma::rowvec t3 = arma::conv(IndMap,mask1); 
+                arma::rowvec currislands = t3.subvec(mask1.size()/2,t3.size()-1-mask1.size()/2);       
+                arma::rowvec islandsdMult = currislands%island;
+                
+                arma::uvec islandsIndex = find(islandsdMult > 0);
+                
+                if (islandsIndex.size() > 0)
+                    valid_sets(iSet) = 0;
+            }
+        }
+    }
+    else
+    {
+        Part newPart;
+        newPart.n = nBeat;
+        newPart.indices.push_back(0);
+        newPart.letter = 'A';
+        newPart.value = 1;
+        newPart.level = 1;
+        parts.push_back(newPart);
+    }
+   
+    arma::vec bar = linspace(1,nBeat,nBeat);    
+    Part np = nullpart(parts,bar);
+    
+    parts.push_back(np);
+    
+    // -------------- NOT CONVERTED -------------------------------------  
+    // if param.seg.editor
+    //    [pa, ta] = partarray(parts);
+    //    parts = editorssearch(pa, ta, parts);
+    //    parts = [parts, nullpart(parts,1:nBeat)];
+    // end
+    // ------------------------------------------------------------------
+
+    
+    mergenulls(parts);
+    
+    
+    // -------------- NOT CONVERTED -------------------------------------  
+    // if param.seg.editor
+    //    [pa, ta] = partarray(parts);
+    //    parts = editorssearch(pa, ta, parts);
+    //    parts = [parts, nullpart(parts,1:nBeat)];
+    // end
+    // ------------------------------------------------------------------
+    
+    return parts;
+}
+
+
+
+void songSegmentChroma(Vamp::Plugin::FeatureList quantisedChromagram, vector<Part> &parts)
+{
+    // Collect Info
+    int nBeat = quantisedChromagram.size();                      // Number of feature vector
+    int nFeatValues = quantisedChromagram[0].values.size();      // Number of values for each feature vector
+
+    arma::mat synchTreble = arma::zeros<mat>(nBeat,nFeatValues/2);
+    
+    for (int i = 0; i < nBeat; ++ i)
+        for (int j = 0; j < nFeatValues/2; ++ j)
+        {
+            synchTreble(i,j) = quantisedChromagram[i].values[j];
+        }
+    
+    arma::mat synchBass = arma::zeros<mat>(nBeat,nFeatValues/2);
+    
+    for (int i = 0; i < nBeat; ++ i)
+        for (int j = 0; j < nFeatValues/2; ++ j)
+        {
+            synchBass(i,j) = quantisedChromagram[i].values[j+12];
+        }
+
+    // Process
+    
+    arma::mat segTreble = arma::zeros<arma::mat>(quantisedChromagram.size(),quantisedChromagram[0].values.size()/2);
+    arma::mat segBass = arma::zeros<arma::mat>(quantisedChromagram.size(),quantisedChromagram[0].values.size()/2);
+    
+    for (int iPart=0; iPart < (int)parts.size(); ++iPart)
+    {
+        parts[iPart].nInd = parts[iPart].indices.size();
+        
+        for (int kOccur=0; kOccur<parts[iPart].nInd; ++kOccur)
+        {
+            int kStartIndex = parts[iPart].indices[kOccur];
+            int kEndIndex = kStartIndex + parts[iPart].n-1;
+            
+            segTreble.rows(kStartIndex,kEndIndex) = segTreble.rows(kStartIndex,kEndIndex) + synchTreble.rows(kStartIndex,kEndIndex);
+            segBass.rows(kStartIndex,kEndIndex) = segBass.rows(kStartIndex,kEndIndex) + synchBass.rows(kStartIndex,kEndIndex);
+        }
+    }
+}
+
+
+// Segment Integration
+vector<Part> songSegmentIntegration(vector<Part> &parts)
+{
+    // Break up parts (every part will have one instance)
+    vector<Part> newPartVector;
+    vector<int> partindices;
+    
+    for (int iPart=0; iPart < (int)parts.size(); ++iPart)
+    {
+        parts[iPart].nInd = parts[iPart].indices.size();
+        for (int iInstance=0; iInstance<parts[iPart].nInd; ++iInstance)
+        {
+            Part newPart;
+            newPart.n = parts[iPart].n;
+            newPart.letter = parts[iPart].letter;
+            newPart.value = parts[iPart].value;
+            newPart.level = parts[iPart].level;
+            newPart.indices.push_back(parts[iPart].indices[iInstance]);
+            newPart.nInd = 1;
+            partindices.push_back(parts[iPart].indices[iInstance]);
+            
+            newPartVector.push_back(newPart);
+        }
+    }
+    
+    
+    // Sort the parts in order of occurrence
+    sort (partindices.begin(), partindices.end());
+    
+    for (int i=0; i < (int)partindices.size(); ++i)
+    {
+        bool found = false;
+        int in=0;    
+        while (!found)
+        {
+            if (newPartVector[in].indices[0] == partindices[i])
+            {
+                newPartVector.push_back(newPartVector[in]);
+                newPartVector.erase(newPartVector.begin()+in);
+                found = true;
+            }
+            else
+                in++;
+        }  
+    }
+    
+    // Clear the vector
+    for (int iNewpart=1; iNewpart < (int)newPartVector.size(); ++iNewpart)
+    {
+        if (newPartVector[iNewpart].n < 12)
+        {
+            newPartVector[iNewpart-1].n = newPartVector[iNewpart-1].n + newPartVector[iNewpart].n;
+            newPartVector.erase(newPartVector.begin()+iNewpart);
+        }
+    }
+
+    return newPartVector;
+}
+
+// Segmenter
+Vamp::Plugin::FeatureList Segmentino::runSegmenter(Vamp::Plugin::FeatureList quantisedChromagram)
+{
+    /* --- Display Information --- */
+//    int numBeat = quantisedChromagram.size();
+//    int numFeats = quantisedChromagram[0].values.size();
+
+    vector<Part> parts;
+    vector<Part> finalParts;
+    
+    parts = songSegment(quantisedChromagram);
+    songSegmentChroma(quantisedChromagram,parts);
+    
+    finalParts = songSegmentIntegration(parts);
+    
+    
+    // TEMP ----
+    /*for (int i=0;i<finalParts.size(); ++i)
+     {
+     std::cout << "Parts n° " << i << std::endl;
+     std::cout << "n°: " << finalParts[i].n << std::endl;
+     std::cout << "letter: " <<  finalParts[i].letter << std::endl;
+     
+     std::cout << "indices: ";
+     for (int j=0;j<finalParts[i].indices.size(); ++j)
+         std::cout << finalParts[i].indices[j] << " ";
+       
+     std::cout << std::endl;
+     std::cout <<  "level: " << finalParts[i].level << std::endl;
+     }*/
+    
+    // ---------
+    
+    
+    // Output
+
+    Vamp::Plugin::FeatureList results;
+    
+    
+    Feature seg;
+    
+    arma::vec indices;
+//    int idx=0;
+    vector<int> values;
+    vector<string> letters;
+    
+    for (int iPart=0; iPart < (int)finalParts.size()-1; ++iPart)
+    {
+        int iInstance=0;
+        seg.hasTimestamp = true;
+         
+        int ind = finalParts[iPart].indices[iInstance];
+        int ind1 = finalParts[iPart+1].indices[iInstance];
+         
+        seg.timestamp = quantisedChromagram[ind].timestamp;
+        seg.hasDuration = true;
+        seg.duration = quantisedChromagram[ind1].timestamp-quantisedChromagram[ind].timestamp;
+        seg.values.clear();
+        seg.values.push_back(finalParts[iPart].value);
+        seg.label = finalParts[iPart].letter;
+         
+        results.push_back(seg);
+    }
+    
+    if (finalParts.size() > 0) {
+        int ind = finalParts[finalParts.size()-1].indices[0];
+        seg.hasTimestamp = true;
+        seg.timestamp = quantisedChromagram[ind].timestamp;
+        seg.hasDuration = true;
+        seg.duration = quantisedChromagram[quantisedChromagram.size()-1].timestamp-quantisedChromagram[ind].timestamp;
+        seg.values.clear();
+        seg.values.push_back(finalParts[finalParts.size()-1].value);
+        seg.label = finalParts[finalParts.size()-1].letter;
+    
+        results.push_back(seg);
+    }
+
+    return results;    
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
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+