annotate tests/TestChromagram.cpp @ 468:a72d98f8baa3

Revise mechanism for extending chromagram to round number of octaves -
do it only in the chromagram itself, so that we can still create deviant
constant-Q spectrograms if desired

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

#include "dsp/chromagram/Chromagram.h"

#include <iostream>

#include <cmath>

#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_MAIN

#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_SUITE(TestChromagram)

using std::cout;
using std::endl;
using std::string;
using std::vector;

string midiPitchName(int midiPitch)
{
    static string names[] = {
        "C",  "C#", "D",  "D#",
        "E",  "F",  "F#", "G",
        "G#", "A",  "A#", "B"
    };

    return names[midiPitch % 12];
}

vector<double> generateSinusoid(double frequency,
                                double sampleRate,
                                int length)
{
    vector<double> buffer;
    for (int i = 0; i < length; ++i) {
        buffer.push_back(sin((i * M_PI * 2.0 * frequency) / sampleRate));
    }
    return buffer;
}

double frequencyForPitch(int midiPitch, double concertA)
{
    return concertA * pow(2.0, (midiPitch - 69.0) / 12.0);
}

BOOST_AUTO_TEST_CASE(sinusoid_12tET)
{
    double concertA = 440.0;
    double sampleRate = 44100.0;
    int bpo = 60;

    ChromaConfig config {
        sampleRate,
        frequencyForPitch(36, concertA),
        frequencyForPitch(108, concertA),
        bpo,
        0.0054,
        MathUtilities::NormaliseNone
    };
    
    Chromagram chroma(config);
    
    for (int midiPitch = 36; midiPitch < 108; ++midiPitch) {

        cout << endl;

        int blockSize = chroma.getFrameSize();
        int hopSize = chroma.getHopSize();
        cerr << "blockSize = " << blockSize
             << ", hopSize = " << hopSize << endl;

        double frequency = frequencyForPitch(midiPitch, concertA);
        int expectedPeakBin = ((midiPitch - 36) * 5) % bpo;

        cout << "midiPitch = " << midiPitch
             << ", name = " << midiPitchName(midiPitch)
             << ", frequency = " << frequency
             << ", expected peak bin = "
             << expectedPeakBin << endl;
        
        vector<double> signal = generateSinusoid(frequency,
                                                 sampleRate,
                                                 blockSize);

        double *output = chroma.process(signal.data());

        int peakBin = -1;
        double peakValue = 0.0;

        for (int i = 0; i < bpo; ++i) {
            if (i == 0 || output[i] > peakValue) {
                peakValue = output[i];
                peakBin = i;
            }
        }

        cout << "peak value = " << peakValue << " at bin " << peakBin << endl;
        cout << "(neighbouring values are "
             << (peakBin > 0 ? output[peakBin-1] : output[bpo-1])
             << " and "
             << (peakBin+1 < bpo ? output[peakBin+1] : output[0])
             << ")" << endl;

        if (peakBin != expectedPeakBin) {
            cout << "NOTE: peak bin " << peakBin << " does not match expected " << expectedPeakBin << endl;
            cout << "bin values are: ";
            for (int i = 0; i < bpo; ++i) {
                cout << i << ": " << output[i] << "   ";
            }
            cout << endl;
        }
    }
}

BOOST_AUTO_TEST_SUITE_END()