Cepstral Pitch Tracker

    return "cepstral-pitchtracker";

    return "Cepstral Pitch Tracker";

//        std::cerr << "magmean = " << magmean << ", confidence = " << confidence << std::endl;

LDFLAGS		:= $(LDFLAGS) -lvamp-sdk

	   NoteHypothesis.h \

	   PeakInterpolator.h

	   PeakInterpolator.cpp \

		$(MAKE) -C test

		rm -f $(OBJECTS)

		$(MAKE) -C test clean

		rm -f $(PLUGIN)

		$(MAKE) -C test distclean

CepstralPitchTracker.o:	$(HEADERS) $(SOURCES)

NoteHypothesis.o:	$(HEADERS) $(SOURCES)

PeakInterpolator.o:	$(HEADERS) $(SOURCES)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*

    This file is Copyright (c) 2012 Chris Cannam

    Permission is hereby granted, free of charge, to any person

    obtaining a copy of this software and associated documentation

    files (the "Software"), to deal in the Software without

    restriction, including without limitation the rights to use, copy,

    modify, merge, publish, distribute, sublicense, and/or sell copies

    of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be

    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR

    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#include "PeakInterpolator.h"

static double cubicInterpolate(const double y[4], double x)

{

    double a0 = y[3] - y[2] - y[0] + y[1];

    double a1 = y[0] - y[1] - a0;

    double a2 = y[2] - y[0];

    double a3 = y[1];

    return

        a0 * x * x * x +

        a1 * x * x +

        a2 * x +

        a3;

}

double

PeakInterpolator::findPeakLocation(const double *data, int size, int peakIndex)

{

    if (peakIndex < 2 || peakIndex > size - 3) {

        return peakIndex;

    }

    double maxval = 0.0;

    double location = peakIndex;

    const int divisions = 10;

    double y[4];

    y[0] = data[peakIndex-1];

    y[1] = data[peakIndex];

    y[2] = data[peakIndex+1];

    y[3] = data[peakIndex+2];

    for (int i = 0; i < divisions; ++i) {

        double probe = double(i) / double(divisions);

        double value = cubicInterpolate(y, probe);

        if (value > maxval) {

            maxval = value; 

            location = peakIndex + probe;

        }

    }

    y[3] = y[2];

    y[2] = y[1];

    y[1] = y[0];

    y[0] = data[peakIndex-2];

    for (int i = 0; i < divisions; ++i) {

        double probe = double(i) / double(divisions);

        double value = cubicInterpolate(y, probe);

        if (value > maxval) {

            maxval = value; 

            location = peakIndex - 1 + probe;

        }

    }

    return location;

}

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*

    This file is Copyright (c) 2012 Chris Cannam

    Permission is hereby granted, free of charge, to any person

    obtaining a copy of this software and associated documentation

    files (the "Software"), to deal in the Software without

    restriction, including without limitation the rights to use, copy,

    modify, merge, publish, distribute, sublicense, and/or sell copies

    of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be

    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR

    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#ifndef _PEAK_INTERPOLATOR_H_

#define _PEAK_INTERPOLATOR_H_

class PeakInterpolator

{

public:

    PeakInterpolator() { } 

    ~PeakInterpolator() { }

    /**

     * Return the interpolated location (i.e. between sample point

     * indices) of the peak whose sample is found at peakIndex in a

     * series of size samples.

     */

    double findPeakLocation(const double *data, int size, int peakIndex);

};

#endif

    case  0: return cepitchPluginAdapter.getDescriptor();

SUPER_OBJECTS	:= ../NoteHypothesis.o ../PeakInterpolator.o

OBJECTS		:= TestNoteHypothesis.o TestPeakInterpolator.o

TESTS		:= test-notehypothesis test-peakinterpolator

all:	run-tests

test-notehypothesis:	TestNoteHypothesis.o

test-peakinterpolator:	TestPeakInterpolator.o

	$(CXX) -o $@ $^ $(SUPER_OBJECTS) $(LDFLAGS)

run-tests:	$(TESTS)

		for t in $(TESTS); do ./"$$t" || exit 1; done

clean:	

	rm -f $(OBJECTS)

distclean:	clean

	rm -f $(TESTS)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*

    This file is Copyright (c) 2012 Chris Cannam

    Permission is hereby granted, free of charge, to any person

    obtaining a copy of this software and associated documentation

    files (the "Software"), to deal in the Software without

    restriction, including without limitation the rights to use, copy,

    modify, merge, publish, distribute, sublicense, and/or sell copies

    of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be

    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR

    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#include "PeakInterpolator.h"

#define BOOST_TEST_DYN_LINK

#define BOOST_TEST_MAIN

#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_SUITE(TestPeakInterpolator)

BOOST_AUTO_TEST_CASE(peakAtSample_N3)

{

    double data[] = { 0.0, 1.0, 0.0 };

    PeakInterpolator p;

    double result = p.findPeakLocation(data, 3, 1);

    BOOST_CHECK_EQUAL(result, 1.0);

}

BOOST_AUTO_TEST_CASE(peakAtSample_N4)

{

    double data[] = { 0.0, 1.0, 2.0, 0.0 };

    PeakInterpolator p;

    double result = p.findPeakLocation(data, 4, 2);

    //!!! Actually, this isn't certain at all I think? It could quite

    //!!! reasonably be smaller than 2.0

    BOOST_CHECK_EQUAL(result, 2.0);

}

BOOST_AUTO_TEST_CASE(peakAtSample_N5)

{

    double data[] = { 0.0, 1.0, 2.0, 1.0, 0.0 };

    PeakInterpolator p;

    double result = p.findPeakLocation(data, 5, 2);

    BOOST_CHECK_EQUAL(result, 2.0);

}

BOOST_AUTO_TEST_CASE(flat)

{

    double data[] = { 1.0, 1.0, 1.0, 1.0, 1.0 };

    PeakInterpolator p;

    double result = p.findPeakLocation(data, 5, 2);

    BOOST_CHECK_EQUAL(result, 2.0);

}

BOOST_AUTO_TEST_CASE(multiPeak)

{

    double data[] = { 1.0, 2.0, 1.0, 2.0, 1.0 };

    PeakInterpolator p;

    double result = p.findPeakLocation(data, 5, 3);

    BOOST_CHECK_EQUAL(result, 3.0);

}

BOOST_AUTO_TEST_SUITE_END()