TEST (LowPassFilterTest, WorksOnRepetitiveWaves) {
// make two sine waves, but this time, several seconds long
unsigned int samples = frameRate * 5;
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(samples);
for (unsigned int i = 0; i < samples; i++) {
float sample = 0.0;
sample += sine_wave(i, highFrequency, frameRate, magnitude); // high freq
sample += sine_wave(i, lowFrequency, frameRate, magnitude); // low freq
a.setSample(i, sample);
// ensure repetition of sine waves is perfect...
if (i >= frameRate) {
ASSERT_NEAR(a.getSample(i), a.getSample(i - frameRate), tolerance);
}
}
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
lpf->filter(a, w);
delete lpf;
// test for lower wave only
for (unsigned int i = 0; i < samples; i++) {
float expected = sine_wave(i, lowFrequency, frameRate, magnitude);
ASSERT_NEAR(expected, a.getSample(i), tolerance);
}
}
TEST (AudioDataTest, SampleInitialisation) {
KeyFinder::AudioData a;
a.addToSampleCount(100);
ASSERT_EQ(100, a.getSampleCount());
// init values
for (int i = 0; i < 100; i++) {
ASSERT_FLOAT_EQ(0.0, a.getSample(i));
}
}
TEST (AudioDataTest, DownsamplerInsistsOnMonophonicAudio) {
KeyFinder::AudioData a;
a.setChannels(2);
a.setFrameRate(100);
a.addToSampleCount(10);
ASSERT_THROW(a.downsample(5), KeyFinder::Exception);
a.reduceToMono();
ASSERT_NO_THROW(a.downsample(5));
}
TEST(AudioDataTest, SamplesBasic){
KeyFinder::AudioData a;
a.addToSampleCount(100);
ASSERT_EQ(100, a.getSampleCount());
// init values
for(int i=0; i<100; i++){
ASSERT_EQ(0.0, a.getSample(i));
}
a.setSample(0, 10.0);
ASSERT_EQ(10.0, a.getSample(0));
}
TEST (AudioDataTest, SampleMutatorBounds) {
KeyFinder::AudioData a;
a.addToSampleCount(5);
ASSERT_THROW(a.getSample(-1), KeyFinder::Exception);
ASSERT_THROW(a.getSample(5), KeyFinder::Exception);
ASSERT_THROW(a.setSample(-1, 1.0), KeyFinder::Exception);
ASSERT_THROW(a.setSample(5, 1.0), KeyFinder::Exception);
ASSERT_THROW(a.setSample(0, INFINITY), KeyFinder::Exception);
ASSERT_THROW(a.setSample(0, NAN), KeyFinder::Exception);
}
TEST (LowPassFilterTest, InsistsOnMonophonicAudio) {
KeyFinder::AudioData a;
a.setChannels(2);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
ASSERT_THROW(lpf->filter(a, w), KeyFinder::Exception);
a.reduceToMono();
ASSERT_NO_THROW(lpf->filter(a, w));
delete lpf;
}
TEST (LowPassFilterTest, InitialisesNullBuffer) {
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
std::vector<double>* nullPtr = NULL;
ASSERT_EQ(nullPtr, w.lpfBuffer);
lpf->filter(a, w);
ASSERT_NE(nullPtr, w.lpfBuffer);
}
TEST (AudioDataTest, MakeMono) {
KeyFinder::AudioData a;
a.setChannels(2);
a.addToSampleCount(20);
for (int i = 0; i < 10; i++) {
a.setSample(i * 2, 100.0);
}
a.reduceToMono();
ASSERT_EQ(10, a.getSampleCount());
for (int i = 0; i < 10; i++) {
ASSERT_FLOAT_EQ(50.0, a.getSample(i));
}
}
TEST (LowPassFilterTest, DoesntAlterAudioMetadata) {
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
lpf->filter(a, w);
delete lpf;
ASSERT_EQ(1, a.getChannels());
ASSERT_EQ(frameRate, a.getFrameRate());
ASSERT_EQ(frameRate, a.getSampleCount());
}
TEST (AudioDataTest, DownsamplerResamplesIntegralRelationship) {
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(100);
a.addToSampleCount(10);
for (unsigned int i = 0; i < 5; i++)
a.setSample(i, 100.0);
for (unsigned int i = 5; i < 10; i++)
a.setSample(i, 500.0);
a.downsample(5);
ASSERT_EQ(20, a.getFrameRate());
ASSERT_EQ(2, a.getSampleCount());
ASSERT_FLOAT_EQ(100.0, a.getSample(0));
ASSERT_FLOAT_EQ(500.0, a.getSample(1));
}
TEST (AudioDataTest, DownsamplerResamplesNonintegralRelationship) {
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(100);
a.addToSampleCount(12);
for (unsigned int i = 0; i < 5; i++)
a.setSample(i, 100.0);
for (unsigned int i = 5; i < 10; i++)
a.setSample(i, 500.0);
for (unsigned int i = 10; i < 12; i++)
a.setSample(i, 1000.0);
a.downsample(5);
ASSERT_EQ(3, a.getSampleCount());
ASSERT_FLOAT_EQ(100.0, a.getSample(0));
ASSERT_FLOAT_EQ(500.0, a.getSample(1));
// this doesn't make total mathematical sense but I'm taking a shortcut for performance
ASSERT_FLOAT_EQ(1000.0, a.getSample(2));
}
TEST (LowPassFilterTest, KillsHigherFreqs) {
// make a high frequency sine wave, one second long
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
for (unsigned int i = 0; i < frameRate; i++) {
a.setSample(i, sine_wave(i, highFrequency, frameRate, magnitude));
}
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
lpf->filter(a, w);
delete lpf;
// test for near silence
for (unsigned int i = 0; i < frameRate; i++) {
ASSERT_NEAR(0.0, a.getSample(i), tolerance);
}
}
TEST (LowPassFilterTest, MaintainsLowerFreqs) {
// make a low frequency sine wave, one second long
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
for (unsigned int i = 0; i < frameRate; i++) {
a.setSample(i, sine_wave(i, lowFrequency, frameRate, magnitude));
}
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
lpf->filter(a, w);
delete lpf;
// test for near perfect reproduction
for (unsigned int i = 0; i < frameRate; i++) {
float expected = sine_wave(i, lowFrequency, frameRate, magnitude);
ASSERT_NEAR(expected, a.getSample(i), tolerance);
}
}
TEST (AudioDataTest, Iterators) {
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(1);
a.addToSampleCount(10);
a.setSample(0, 10.0);
a.setSample(1, 20.0);
a.setSample(3, 50.0);
a.resetIterators(); // this is required before each use
ASSERT_FLOAT_EQ(10.0, a.getSampleAtReadIterator());
a.setSampleAtWriteIterator(15.0);
ASSERT_FLOAT_EQ(15.0, a.getSampleAtReadIterator());
a.advanceReadIterator();
a.advanceWriteIterator();
ASSERT_FLOAT_EQ(20.0, a.getSampleAtReadIterator());
a.setSampleAtWriteIterator(25.0);
ASSERT_FLOAT_EQ(25.0, a.getSampleAtReadIterator());
a.advanceReadIterator(2);
a.advanceWriteIterator(2);
ASSERT_FLOAT_EQ(50.0, a.getSampleAtReadIterator());
a.setSampleAtWriteIterator(55.0);
ASSERT_FLOAT_EQ(55.0, a.getSampleAtReadIterator());
a.resetIterators();
ASSERT_FLOAT_EQ(15.0, a.getSampleAtReadIterator());
a.setSampleAtWriteIterator(150.0);
ASSERT_FLOAT_EQ(150.0, a.getSampleAtReadIterator());
ASSERT_TRUE(a.readIteratorWithinUpperBound());
ASSERT_TRUE(a.writeIteratorWithinUpperBound());
a.advanceReadIterator(10);
a.advanceWriteIterator(10);
ASSERT_FALSE(a.readIteratorWithinUpperBound());
ASSERT_FALSE(a.writeIteratorWithinUpperBound());
}
TEST(AudioDataTest, Frames){
KeyFinder::AudioData a;
a.addToSampleCount(4);
ASSERT_THROW(a.getSample(0,0), KeyFinder::Exception);
a.setChannels(2);
ASSERT_EQ(0.0, a.getSample(0,0));
ASSERT_EQ(0.0, a.getSample(0,1));
ASSERT_THROW(a.getSample(-1, 0), KeyFinder::Exception);
ASSERT_THROW(a.getSample(-1, 1), KeyFinder::Exception);
ASSERT_THROW(a.getSample( 2, 0), KeyFinder::Exception);
ASSERT_THROW(a.getSample( 2, 1), KeyFinder::Exception);
ASSERT_THROW(a.getSample( 0,-1), KeyFinder::Exception);
ASSERT_THROW(a.getSample( 0, 2), KeyFinder::Exception);
a.setSample(0,0, 10.0);
ASSERT_EQ(10.0, a.getSample(0,0));
a.setSample(1,0, 20.0);
ASSERT_EQ(20.0, a.getSample(2));
}
TEST (AudioDataTest, DownsamplerResamplesSineWave) {
unsigned int frameRate = 10000;
unsigned int frames = frameRate * 4;
float freq = 20;
float magnitude = 32768.0;
unsigned int factor = 5;
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frames);
for (unsigned int i = 0; i < frames; i++)
a.setSample(i, sine_wave(i, freq, frameRate, magnitude));
a.downsample(factor);
unsigned int newFrameRate = frameRate / factor;
unsigned int newFrames = frames / factor;
ASSERT_EQ(newFrameRate, a.getFrameRate());
ASSERT_EQ(newFrames, a.getSampleCount());
for (unsigned int i = 0; i < newFrames; i++)
ASSERT_NEAR(sine_wave(i, freq, newFrameRate, magnitude), a.getSample(i), magnitude * 0.05);
}
TEST (LowPassFilterTest, DoesBothAtOnce) {
// make two sine waves, one second long
KeyFinder::AudioData a;
a.setChannels(1);
a.setFrameRate(frameRate);
a.addToSampleCount(frameRate);
for (unsigned int i = 0; i < frameRate; i++) {
float sample = 0.0;
sample += sine_wave(i, highFrequency, frameRate, magnitude); // high freq
sample += sine_wave(i, lowFrequency, frameRate, magnitude); // low freq
a.setSample(i, sample);
}
KeyFinder::LowPassFilter* lpf = new KeyFinder::LowPassFilter(filterOrder, frameRate, cornerFrequency, filterFFT);
KeyFinder::Workspace w;
lpf->filter(a, w);
delete lpf;
// test for lower wave only
for (unsigned int i = 0; i < frameRate; i++) {
float expected = sine_wave(i, lowFrequency, frameRate, magnitude);
ASSERT_NEAR(expected, a.getSample(i), tolerance);
}
}
TEST (AudioDataTest, SampleMutator) {
KeyFinder::AudioData a;
a.addToSampleCount(1);
a.setSample(0, 10.0);
ASSERT_FLOAT_EQ(10.0, a.getSample(0));
}
const char* kfinder_get_key(short signed int *samples,
unsigned int nb_samples,
short unsigned int frame_rate,
short unsigned int nb_channels)
{
// Check input parameter.
if ((samples == NULL) || (nb_samples == 0) || (frame_rate == 0) || (nb_channels == 0))
{
return "";
}
// Build the main computing object.
KeyFinder::KeyFinder k;
// Build an empty audio object
KeyFinder::AudioData a;
// Prepare the object for your audio stream
a.setFrameRate(frame_rate);
a.setChannels(nb_channels);
a.addToSampleCount(nb_samples);
// Copy your audio into the object (as float).
for (unsigned int i = 0; i < nb_samples; i++)
{
a.setSample(i, (float)samples[i]);
}
// Run the analysis
KeyFinder::key_t r;
try
{
r = k.keyOfAudio(a);
}
catch(const std::exception& e)
{
cerr << "libKeyFinder: exception: " << e.what() << endl;
return "";
}
catch(...)
{
cerr << "libKeyFinder: unknown exception" << endl;
return "";
}
// And do something with the result!
switch(r)
{
case KeyFinder::A_MAJOR: return "AM";
case KeyFinder::A_MINOR: return "Am";
case KeyFinder::B_FLAT_MAJOR: return "BbM";
case KeyFinder::B_FLAT_MINOR: return "Bbm";
case KeyFinder::B_MAJOR: return "BM";
case KeyFinder::B_MINOR: return "Bm";
case KeyFinder::C_MAJOR: return "CM";
case KeyFinder::C_MINOR: return "Cm";
case KeyFinder::D_FLAT_MAJOR: return "DbM";
case KeyFinder::D_FLAT_MINOR: return "Dbm";
case KeyFinder::D_MAJOR: return "DM";
case KeyFinder::D_MINOR: return "Dm";
case KeyFinder::E_FLAT_MAJOR: return "EbM";
case KeyFinder::E_FLAT_MINOR: return "Ebm";
case KeyFinder::E_MAJOR: return "EM";
case KeyFinder::E_MINOR: return "Em";
case KeyFinder::F_MAJOR: return "FM";
case KeyFinder::F_MINOR: return "Fm";
case KeyFinder::G_FLAT_MAJOR: return "GbM";
case KeyFinder::G_FLAT_MINOR: return "Gbm";
case KeyFinder::G_MAJOR: return "GM";
case KeyFinder::G_MINOR: return "Gm";
case KeyFinder::A_FLAT_MAJOR: return "AbM";
case KeyFinder::A_FLAT_MINOR: return "Abm";
case KeyFinder::SILENCE: return "";
default: return "";
}
}
TEST (AudioDataTest, FrameAccessBeforeChannelsInitialised) {
KeyFinder::AudioData a;
a.addToSampleCount(4);
ASSERT_THROW(a.getSampleByFrame(0, 0), KeyFinder::Exception);
}