public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
FFT fft = new FFT(1024, 44100);
float[] samples = new float[1024];
float[] spectrum = new float[1024 / 2 + 1];
float[] lastSpectrum = new float[1024 / 2 + 1];
List <float> spectralFlux = new List <float>();
while (decoder.Read(samples, 0, samples.Length) > 0)
{
fft.Forward(samples);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
System.Array.Copy(fft.GetSpectrum(), 0, spectrum, 0, spectrum.Length);
float flux = 0;
for (int i = 0; i < spectrum.Length; i++)
{
flux += (spectrum[i] - lastSpectrum[i]);
}
spectralFlux.Add(flux);
}
Plot plot = new Plot("Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, 1024, FILE);
//new PlaybackVisualizer(plot, spectralFlux.Count, FILE);
}
public static void Main(string[] argv)
{
ISampleProvider reader = new AudioFileReader("samples/sample.wav");
List <float> allSamples = new List <float>();
float[] samples = new float[1024];
while (reader.Read(samples, 0, samples.Length) > 0)
{
for (int i = 0; i < samples.Length; i++)
{
allSamples.Add(samples[i]);
}
}
samples = new float[allSamples.Count];
for (int i = 0; i < samples.Length; i++)
{
samples[i] = allSamples[i];
}
Plot plot = new Plot("Wave Plot", 512, 512);
plot.plot(samples, 44100 / 1000, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
SpectrumProvider spectrumProvider = new SpectrumProvider(decoder, 1024, HOP_SIZE, true);
float[] spectrum = spectrumProvider.nextSpectrum();
float[] lastSpectrum = new float[spectrum.Length];
List<float> spectralFlux = new List<float>();
do
{
float flux = 0;
for(int i = 0; i < spectrum.Length; i++)
{
float @value = (spectrum[i] - lastSpectrum[i]);
flux += @value < 0 ? 0 : @value;
}
spectralFlux.Add(flux);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
} while((spectrum = spectrumProvider.nextSpectrum()) != null);
Plot plot = new Plot("Hopping Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, HOP_SIZE, FILE);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
SpectrumProvider spectrumProvider = new SpectrumProvider(decoder, 1024, HOP_SIZE, true);
float[] spectrum = spectrumProvider.nextSpectrum();
float[] lastSpectrum = new float[spectrum.Length];
List <float> spectralFlux = new List <float>();
do
{
float flux = 0;
for (int i = 0; i < spectrum.Length; i++)
{
float @value = (spectrum[i] - lastSpectrum[i]);
flux += @value < 0 ? 0 : @value;
}
spectralFlux.Add(flux);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
} while((spectrum = spectrumProvider.nextSpectrum()) != null);
Plot plot = new Plot("Hopping Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, HOP_SIZE, FILE);
}
public static void Main(string[] argv)
{
float[] samples = ReadInAllSamples(FILE);
Plot plot = new Plot("Wave Plot", 1024, 512);
plot.plot(samples, SAMPLE_WINDOW_SIZE, Color.Red);
plot.Shown += new EventHandler(PlotShown);
Application.Run(plot);
}
public static void Main(string[] argv)
{
float[] samples = ReadInAllSamples(FILE);
Plot plot = new Plot("Wave Plot", 1024, 512);
plot.plot(samples, SAMPLE_WINDOW_SIZE, Color.Red);
plot.Shown += new EventHandler(PlotShown);
Application.Run(plot);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
SpectrumProvider spectrumProvider = new SpectrumProvider(decoder, 1024, HOP_SIZE, true);
float[] spectrum = spectrumProvider.nextSpectrum();
float[] lastSpectrum = new float[spectrum.Length];
List <List <float> > spectralFlux = new List <List <float> >();
for (int i = 0; i < bands.Length / 2; i++)
{
spectralFlux.Add(new List <float>());
}
do
{
for (int i = 0; i < bands.Length; i += 2)
{
int startFreq = spectrumProvider.getFFT().FreqToIndex(bands[i]);
int endFreq = spectrumProvider.getFFT().FreqToIndex(bands[i + 1]);
float flux = 0;
for (int j = startFreq; j <= endFreq; j++)
{
float @value = (spectrum[j] - lastSpectrum[j]);
@value = (@value + Math.Abs(@value)) / 2;
flux += @value;
}
spectralFlux[i / 2].Add(flux);
}
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
} while((spectrum = spectrumProvider.nextSpectrum()) != null);
List <List <float> > thresholds = new List <List <float> >();
for (int i = 0; i < bands.Length / 2; i++)
{
List <float> threshold = new ThresholdFunction(HISTORY_SIZE, multipliers[i]).calculate(spectralFlux[i]);
thresholds.Add(threshold);
}
Plot plot = new Plot("Multiband Spectral Flux", 1024, 512);
for (int i = 0; i < bands.Length / 2; i++)
{
plot.plot(spectralFlux[i], 1, -0.6f * (bands.Length / 2 - 2) + i, false, Color.Red);
plot.plot(thresholds[i], 1, -0.6f * (bands.Length / 2 - 2) + i, true, Color.Green);
}
new PlaybackVisualizer(plot, HOP_SIZE, FILE);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
SpectrumProvider spectrumProvider = new SpectrumProvider(decoder, 1024, HOP_SIZE, true);
float[] spectrum = spectrumProvider.nextSpectrum();
float[] lastSpectrum = new float[spectrum.Length];
List<List<float>> spectralFlux = new List<List<float>>();
for(int i = 0; i < bands.Length / 2; i++) {
spectralFlux.Add(new List<float>());
}
do {
for(int i = 0; i < bands.Length; i+=2) {
int startFreq = spectrumProvider.getFFT().FreqToIndex(bands[i]);
int endFreq = spectrumProvider.getFFT().FreqToIndex(bands[i+1]);
float flux = 0;
for(int j = startFreq; j <= endFreq; j++)
{
float @value = (spectrum[j] - lastSpectrum[j]);
@value = (@value + Math.Abs(@value))/2;
flux += @value;
}
spectralFlux[i/2].Add(flux);
}
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
} while((spectrum = spectrumProvider.nextSpectrum()) != null);
List<List<float>> thresholds = new List<List<float>>();
for(int i = 0; i < bands.Length / 2; i++)
{
List<float> threshold = new ThresholdFunction(HISTORY_SIZE, multipliers[i]).calculate(spectralFlux[i]);
thresholds.Add(threshold);
}
Plot plot = new Plot("Multiband Spectral Flux", 1024, 512);
for(int i = 0; i < bands.Length / 2; i++)
{
plot.plot(spectralFlux[i], 1, -0.6f * (bands.Length / 2 - 2) + i, false, Color.Red);
plot.plot(thresholds[i], 1, -0.6f * (bands.Length / 2 - 2) + i, true, Color.Green);
}
new PlaybackVisualizer(plot, HOP_SIZE, FILE);
}
public static void Main(string[] argv)
{
ISampleProvider reader = new AudioFileReader("samples/sample.wav");
List<float> allSamples = new List<float>();
float[] samples = new float[1024];
while(reader.Read(samples, 0, samples.Length) > 0)
{
for(int i = 0; i < samples.Length; i++)
allSamples.Add(samples[i]);
}
samples = new float[allSamples.Count];
for(int i = 0; i < samples.Length; i++)
samples[i] = allSamples[i];
Plot plot = new Plot("Wave Plot", 512, 512);
plot.plot(samples, 44100 / 1000, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
const float frequency = 440; // Note A
float increment = (float)(2*Math.PI) * frequency / 44100;
float angle = 0;
float[] samples = new float[1024];
FFT fft = new FFT(1024, 44100);
for(int i = 0; i < samples.Length; i++)
{
samples[i] = (float)Math.Sin(angle);
angle += increment;
}
fft.Forward(samples);
Plot plot = new Plot("Note A Spectrum", 512, 512);
plot.plot(fft.GetSpectrum(), 1, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
const float frequency = 440; // Note A
float increment = (float)(2 * Math.PI) * frequency / 44100;
float angle = 0;
float[] samples = new float[1024];
FFT fft = new FFT(1024, 44100);
for (int i = 0; i < samples.Length; i++)
{
samples[i] = (float)Math.Sin(angle);
angle += increment;
}
fft.Forward(samples);
Plot plot = new Plot("Note A Spectrum", 512, 512);
plot.plot(fft.GetSpectrum(), 1, Color.Red);
Application.Run(plot);
}
public static void Main(string[] argv)
{
ISampleProvider decoder = new AudioFileReader(FILE);
FFT fft = new FFT(1024, 44100);
fft.Window(FFT.HAMMING);
float[] samples = new float[1024];
float[] spectrum = new float[1024 / 2 + 1];
float[] lastSpectrum = new float[1024 / 2 + 1];
List<float> spectralFlux = new List<float>();
while(decoder.Read(samples, 0, samples.Length) > 0)
{
fft.Forward(samples);
System.Array.Copy(spectrum, 0, lastSpectrum, 0, spectrum.Length);
System.Array.Copy(fft.GetSpectrum(), 0, spectrum, 0, spectrum.Length);
float flux = 0;
for(int i = 0; i < spectrum.Length; i++)
{
float @value = (spectrum[i] - lastSpectrum[i]);
flux += @value < 0 ? 0 : @value;
}
spectralFlux.Add(flux);
}
Plot plot = new Plot("Hamming Spectral Flux", 1024, 512);
plot.plot(spectralFlux, 1, Color.Red);
new PlaybackVisualizer(plot, 1024, FILE);
}
