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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
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 TEST_WAVEFORM_OVERSAMPLER_H
#define TEST_WAVEFORM_OVERSAMPLER_H
#include "../WaveformOversampler.h"
#include "../WritableWaveFileModel.h"
#include "../../../base/BaseTypes.h"
#include <QObject>
#include <QtTest>
using namespace sv;
class TestWaveformOversampler : public QObject
{
Q_OBJECT
public:
TestWaveformOversampler() {
m_source = floatvec_t(5000, 0.f);
m_source[0] = 1.f;
m_source[2500] = 0.5f;
m_source[2501] = -0.5f;
m_source[4999] = -1.f;
for (int i = 3000; i < 3900; ++i) {
m_source[i] = float(sin(double(i - 3000) * M_PI / 50.0));
}
m_sourceModel = new WritableWaveFileModel(8000, 1);
const float *d = m_source.data();
QVERIFY(m_sourceModel->addSamples(&d, m_source.size()));
m_sourceModel->writeComplete();
}
~TestWaveformOversampler() {
delete m_sourceModel;
}
private:
floatvec_t m_source;
WritableWaveFileModel *m_sourceModel;
void compareStrided(floatvec_t obtained, floatvec_t expected, int stride) {
QCOMPARE(obtained.size(), expected.size() * stride);
float threshold = 1e-10f;
#ifdef WITHOUT_LIBSNDFILE
// We don't have full-precision floating-point WAVs backing
// our test models (they're 24-bit)
threshold = 1.f / float(1 << 23);
#endif
for (int i = 0; in_range_for(expected, i); ++i) {
float diff = fabsf(obtained[i * stride] - expected[i]);
if (diff > threshold) {
std::cerr << "At position " << i * stride << ": "
<< obtained[i * stride] << " != " << expected[i]
<< " (diff = " << diff << ", > threshold " << threshold
<< ")" << std::endl;
QCOMPARE(obtained, expected);
}
}
}
void compareVecs(floatvec_t obtained, floatvec_t expected) {
compareStrided(obtained, expected, 1);
}
floatvec_t get(sv_frame_t sourceStartFrame,
sv_frame_t sourceFrameCount,
int oversampleBy) {
return WaveformOversampler::getOversampledData
(*m_sourceModel, 0,
sourceStartFrame, sourceFrameCount, oversampleBy);
}
void testVerbatim(sv_frame_t sourceStartFrame,
sv_frame_t sourceFrameCount,
int oversampleBy,
floatvec_t expected) {
floatvec_t output =
get(sourceStartFrame, sourceFrameCount, oversampleBy);
compareVecs(output, expected);
}
void testStrided(sv_frame_t sourceStartFrame,
sv_frame_t sourceFrameCount,
int oversampleBy,
floatvec_t expected) {
// check only the values that are expected to be precisely the
// original samples
floatvec_t output =
get(sourceStartFrame, sourceFrameCount, oversampleBy);
compareStrided(output, expected, oversampleBy);
}
floatvec_t sourceSubset(sv_frame_t start, sv_frame_t length) {
return floatvec_t(m_source.begin() + start,
m_source.begin() + start + length);
}
private slots:
void testWholeVerbatim() {
testVerbatim(0, 5000, 1, m_source);
}
void testSubsetsVerbatim() {
testVerbatim(0, 500, 1, sourceSubset(0, 500));
testVerbatim(4500, 500, 1, sourceSubset(4500, 500));
testVerbatim(2000, 1000, 1, sourceSubset(2000, 1000));
}
void testOverlapsVerbatim() {
// overlapping the start -> result should be zero-padded to
// preserve start frame
floatvec_t expected = sourceSubset(0, 400);
expected.insert(expected.begin(), 100, 0.f);
testVerbatim(-100, 500, 1, expected);
// overlapping the end -> result should be truncated to
// preserve source length
expected = sourceSubset(4600, 400);
testVerbatim(4600, 500, 1, expected);
}
void testWhole2x() {
testStrided(0, 5000, 2, m_source);
// check for windowed sinc values between the original samples
floatvec_t output = get(0, 5000, 2);
QVERIFY(output[1] - 0.6358 < 0.0001);
QVERIFY(output[3] + 0.2099 < 0.0001);
}
void testWhole3x() {
testStrided(0, 5000, 3, m_source);
// check for windowed sinc values between the original samples
floatvec_t output = get(0, 5000, 3);
QVERIFY(output[1] > 0.7);
QVERIFY(output[2] > 0.4);
QVERIFY(output[4] < -0.1);
QVERIFY(output[5] < -0.1);
}
void testWhole4x() {
testStrided(0, 5000, 4, m_source);
// check for windowed sinc values between the original samples
floatvec_t output = get(0, 5000, 4);
QVERIFY(output[1] - 0.9000 < 0.0001);
QVERIFY(output[2] - 0.6358 < 0.0001);
QVERIFY(output[3] - 0.2993 < 0.0001);
QVERIFY(output[5] + 0.1787 < 0.0001);
QVERIFY(output[6] + 0.2099 < 0.0001);
QVERIFY(output[7] + 0.1267 < 0.0001);
// alternate values at 2n should equal all values at n
output = get(0, 5000, 4);
floatvec_t half = get(0, 5000, 2);
compareStrided(output, half, 2);
}
void testWhole8x() {
testStrided(0, 5000, 8, m_source);
// alternate values at 2n should equal all values at n
floatvec_t output = get(0, 5000, 8);
floatvec_t half = get(0, 5000, 4);
compareStrided(output, half, 2);
}
void testWhole10x() {
testStrided(0, 5000, 10, m_source);
// alternate values at 2n should equal all values at n
floatvec_t output = get(0, 5000, 10);
floatvec_t half = get(0, 5000, 5);
compareStrided(output, half, 2);
}
void testWhole16x() {
testStrided(0, 5000, 16, m_source);
// alternate values at 2n should equal all values at n
floatvec_t output = get(0, 5000, 16);
floatvec_t half = get(0, 5000, 8);
compareStrided(output, half, 2);
}
void testSubsets4x() {
testStrided(0, 500, 4, sourceSubset(0, 500));
testStrided(4500, 500, 4, sourceSubset(4500, 500));
testStrided(2000, 1000, 4, sourceSubset(2000, 1000));
// check for windowed sinc values between the original
// samples, even when the original sample that was the source
// of this sinc kernel is not within the requested range
floatvec_t output = get(1, 10, 4);
QVERIFY(output[0] < 0.0001);
QVERIFY(output[1] + 0.1787 < 0.0001);
QVERIFY(output[2] + 0.2099 < 0.0001);
QVERIFY(output[3] + 0.1267 < 0.0001);
// and again at the end
output = get(4989, 10, 4);
QVERIFY(output[39] + 0.9000 < 0.0001);
QVERIFY(output[38] + 0.6358 < 0.0001);
QVERIFY(output[37] + 0.2993 < 0.0001);
QVERIFY(output[35] - 0.1787 < 0.0001);
QVERIFY(output[34] - 0.2099 < 0.0001);
QVERIFY(output[33] - 0.1267 < 0.0001);
}
void testOverlaps4x() {
// overlapping the start -> result should be zero-padded to
// preserve start frame
floatvec_t expected = sourceSubset(0, 400);
expected.insert(expected.begin(), 100, 0.f);
testStrided(-100, 500, 4, expected);
// overlapping the end -> result should be truncated to
// preserve source length
expected = sourceSubset(4600, 400);
testStrided(4600, 500, 4, expected);
}
void testSubsets15x() {
testStrided(0, 500, 15, sourceSubset(0, 500));
testStrided(4500, 500, 15, sourceSubset(4500, 500));
testStrided(2000, 1000, 15, sourceSubset(2000, 1000));
}
void testOverlaps15x() {
// overlapping the start -> result should be zero-padded to
// preserve start frame
floatvec_t expected = sourceSubset(0, 400);
expected.insert(expected.begin(), 100, 0.f);
testStrided(-100, 500, 15, expected);
// overlapping the end -> result should be truncated to
// preserve source length
expected = sourceSubset(4600, 400);
testStrided(4600, 500, 15, expected);
}
};
#endif
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