public void CreateLogSpectrogramTest()
{
var configuration = new CustomFingerprintConfiguration {
NormalizeSignal = true
};
float[] samples = TestUtilities.GenerateRandomFloatArray((configuration.Overlap * configuration.WdftSize) + configuration.WdftSize); // 64 * 2048
audioSamplesNormalizer.Setup(service => service.NormalizeInPlace(samples));
logUtility.Setup(utility => utility.GenerateLogFrequenciesRanges(configuration)).Returns(new int[33]);
fftService.Setup(service => service.FFTForward(samples, It.IsAny <int>(), configuration.WdftSize))
.Returns(TestUtilities.GenerateRandomFloatArray(2048));
float[][] result = spectrumService.CreateLogSpectrogram(samples, configuration);
audioSamplesNormalizer.Verify(service => service.NormalizeInPlace(samples), Times.Once());
logUtility.Verify(utility => utility.GenerateLogFrequenciesRanges(configuration), Times.Once());
Assert.AreEqual(configuration.WdftSize, result.Length);
Assert.AreEqual(32, result[0].Length);
}
public void FingerprintConfigurationInheritsDefaultValues()
{
var customConfiguration = new CustomFingerprintConfiguration();
var defaultConfiguration = new DefaultFingerprintConfiguration();
Assert.AreEqual(defaultConfiguration.FingerprintLength, customConfiguration.FingerprintLength);
Assert.AreEqual(defaultConfiguration.LogBase, customConfiguration.LogBase);
Assert.AreEqual(defaultConfiguration.LogBins, customConfiguration.LogBins);
Assert.AreEqual(defaultConfiguration.MaxFrequency, customConfiguration.MaxFrequency);
Assert.AreEqual(defaultConfiguration.MinFrequency, customConfiguration.MinFrequency);
Assert.AreEqual(defaultConfiguration.NormalizeSignal, customConfiguration.NormalizeSignal);
Assert.AreEqual(defaultConfiguration.NumberOfLSHTables, customConfiguration.NumberOfLSHTables);
Assert.AreEqual(defaultConfiguration.NumberOfMinHashesPerTable, customConfiguration.NumberOfMinHashesPerTable);
Assert.AreEqual(defaultConfiguration.Overlap, customConfiguration.Overlap);
Assert.AreEqual(defaultConfiguration.SampleRate, customConfiguration.SampleRate);
Assert.AreEqual(defaultConfiguration.SamplesPerFingerprint, customConfiguration.SamplesPerFingerprint);
Assert.IsTrue(defaultConfiguration.Stride.GetType() == customConfiguration.Stride.GetType());
Assert.AreEqual(defaultConfiguration.TopWavelets, customConfiguration.TopWavelets);
Assert.AreEqual(defaultConfiguration.UseDynamicLogBase, customConfiguration.UseDynamicLogBase);
Assert.AreEqual(defaultConfiguration.WdftSize, customConfiguration.WdftSize);
}
public void GenerateLogFrequenciesRangesTest()
{
var defaultConfig = new CustomFingerprintConfiguration {
UseDynamicLogBase = false, LogBase = 10
};
float[] logSpacedFrequencies = new[] // generated in matlab with logspace(2.50242712, 3.3010299957, 33)
{
318.00f, 336.81f, 356.73f, 377.83f, 400.18f, 423.85f, 448.92f, 475.47f, 503.59f, 533.38f, 564.92f,
598.34f, 633.73f, 671.21f, 710.91f, 752.96f, 797.50f, 844.67f, 894.63f, 947.54f, 1003.58f, 1062.94f,
1125.81f, 1192.40f, 1262.93f, 1337.63f, 1416.75f, 1500.54f, 1589.30f, 1683.30f, 1782.86f, 1888.31f,
2000f
};
int[] indexes = logUtility.GenerateLogFrequenciesRanges(defaultConfig);
for (int i = 0; i < logSpacedFrequencies.Length; i++)
{
var logSpacedFrequency = logSpacedFrequencies[i];
int index = logUtility.FrequencyToSpectrumIndex(logSpacedFrequency, defaultConfig.SampleRate, defaultConfig.WdftSize);
Assert.AreEqual(index, indexes[i]);
}
}
public void CustomValuesAreSetOnFingerprintConfiguration()
{
var staticStride = new StaticStride(2048);
var customConfiguration = new CustomFingerprintConfiguration
{
FingerprintLength = 256,
LogBase = 4,
LogBins = 46,
MaxFrequency = 22050,
MinFrequency = 5512,
NormalizeSignal = true,
NumberOfLSHTables = 30,
NumberOfMinHashesPerTable = 4,
Overlap = 32,
SampleRate = 10024,
Stride = staticStride,
TopWavelets = 250,
UseDynamicLogBase = true,
WdftSize = 4048
};
Assert.AreEqual(256, customConfiguration.FingerprintLength);
Assert.AreEqual(4, customConfiguration.LogBase);
Assert.AreEqual(46, customConfiguration.LogBins);
Assert.AreEqual(22050, customConfiguration.MaxFrequency);
Assert.AreEqual(5512, customConfiguration.MinFrequency);
Assert.IsTrue(customConfiguration.NormalizeSignal);
Assert.AreEqual(30, customConfiguration.NumberOfLSHTables);
Assert.AreEqual(4, customConfiguration.NumberOfMinHashesPerTable);
Assert.AreEqual(32, customConfiguration.Overlap);
Assert.AreEqual(10024, customConfiguration.SampleRate);
Assert.AreEqual(staticStride, customConfiguration.Stride);
Assert.AreEqual(250, customConfiguration.TopWavelets);
Assert.IsTrue(customConfiguration.UseDynamicLogBase);
Assert.AreEqual(4048, customConfiguration.WdftSize);
}
