view test/TestCQFrequency.cpp @ 132:c188cade44f8

Tests (not quite correct yet)

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

#include "cq/CQSpectrogram.h"

#include "dsp/Window.h"

#include <cmath>
#include <vector>
#include <iostream>

using std::vector;
using std::cerr;
using std::endl;

#define BOOST_TEST_DYN_LINK
#define BOOST_TEST_MAIN

#include <boost/test/unit_test.hpp>

BOOST_AUTO_TEST_SUITE(TestCQFrequency)

// The principle here is to feed a single windowed sinusoid into a
// small CQ transform and check that the output has its peak bin at
// the correct frequency. We can repeat for different frequencies both
// inside and outside the frequency range supported by the CQ. We
// should also repeat for CQSpectrogram outputs as well as the raw CQ.

// Set up fs/2 = 50, frequency range 10 -> 40 i.e. 2 octaves, fixed
// duration of 2 seconds
static const double sampleRate = 100;
static const double cqmin = 10;
static const double cqmax = 40;
static const double bpo = 4;
static const int duration = sampleRate * 2;

// Threshold below which to ignore a column completely
static const double threshold = 0.08;

int
binForFrequency(double freq)
{
    int bin = (2 * bpo) - round(bpo * log2(freq / cqmin));
    cerr << "binForFrequency: " << freq << " -> " << bin << endl;
    return bin;
}

void
checkCQFreqColumn(int i, vector<double> column, double freq)
{
    double maxval = 0.0;
    int maxidx = -1;
    int height = column.size();
    for (int j = 0; j < height; ++j) {
        if (j == 0 || column[j] > maxval) {
            maxval = column[j];
            maxidx = j;
        }
    }
    cerr << "maxval = " << maxval << " at " << maxidx << endl;
    int expected = binForFrequency(freq);
    if (maxval < threshold) {
        return; // ignore these columns at start and end
    } else if (expected < 0 || expected >= height) {
        cerr << "maxval = " << maxval << endl;
        BOOST_CHECK(maxval < threshold);
    } else {
        BOOST_CHECK_EQUAL(maxidx, expected);
    }
}

void
testCQFrequency(double freq)
{
    CQParameters params(sampleRate, cqmin, cqmax, bpo);
    CQSpectrogram cq(params, CQSpectrogram::InterpolateLinear);

    BOOST_CHECK_EQUAL(cq.getBinsPerOctave(), bpo);
    BOOST_CHECK_EQUAL(cq.getOctaves(), 2);

    vector<double> input;
    for (int i = 0; i < duration; ++i) {
        input.push_back(sin((i * 2 * M_PI * freq) / sampleRate));
    }
    Window<double>(HanningWindow, duration).cut(input.data());

    CQSpectrogram::RealBlock output = cq.process(input);
    CQSpectrogram::RealBlock rest = cq.getRemainingOutput();
    output.insert(output.end(), rest.begin(), rest.end());

    BOOST_CHECK_EQUAL(output[0].size(), cq.getBinsPerOctave() * cq.getOctaves());

    for (int i = 0; i < int(output.size()); ++i) {
        checkCQFreqColumn(i, output[i], freq);
    }
}

BOOST_AUTO_TEST_CASE(freq_5) { testCQFrequency(5); }
BOOST_AUTO_TEST_CASE(freq_10) { testCQFrequency(10); }
BOOST_AUTO_TEST_CASE(freq_15) { testCQFrequency(15); }
BOOST_AUTO_TEST_CASE(freq_20) { testCQFrequency(20); }
BOOST_AUTO_TEST_CASE(freq_25) { testCQFrequency(25); }
BOOST_AUTO_TEST_CASE(freq_30) { testCQFrequency(30); }
BOOST_AUTO_TEST_CASE(freq_35) { testCQFrequency(35); }
BOOST_AUTO_TEST_CASE(freq_40) { testCQFrequency(40); }
BOOST_AUTO_TEST_CASE(freq_45) { testCQFrequency(45); }
BOOST_AUTO_TEST_CASE(freq_50) { testCQFrequency(50); }

BOOST_AUTO_TEST_SUITE_END()