public IEnumerable <Frame> Input(double[] samples, int length)
{
int index = 0;
while (InputUntilStep(samples, length, ref index))
{
Debug.Assert(sample % Step == 0);
shortWindow.Process(buffer, bufferPosition);
mediumWindow.Process(buffer, bufferPosition);
longWindow.Process(buffer, bufferPosition);
Debug.Assert(shortWindow.OutputSize == mediumWindow.OutputSize && mediumWindow.OutputSize == longWindow.OutputSize);
double[] frame = new double[shortWindow.OutputSize * 2 + mediumWindow.OutputSize * 2 + longWindow.OutputSize * 2];
shortWindow.PrepareAbsoluteFrame(frame, 0);
shortWindow.PrepareDifferenceFrame(frame, shortWindow.OutputSize);
mediumWindow.PrepareAbsoluteFrame(frame, shortWindow.OutputSize * 2);
mediumWindow.PrepareDifferenceFrame(frame, shortWindow.OutputSize * 2 + mediumWindow.OutputSize);
longWindow.PrepareAbsoluteFrame(frame, shortWindow.OutputSize * 2 + mediumWindow.OutputSize * 2);
longWindow.PrepareDifferenceFrame(frame, shortWindow.OutputSize * 2 + mediumWindow.OutputSize * 2 + longWindow.OutputSize);
double startTime = (sample * 1.0 - Step) / SamplingFrequency;
double endTime = (sample * 1.0) / SamplingFrequency;
yield return(new Frame(startTime, endTime, frame));
}
}
private static double[] CalculateEnergies(TrackInfo trackInfo)
{
using (WaveFile wave = trackInfo.GetWaveFile())
{
wave.Open();
Debug.Assert(wave.SampleRate == 44100);
PreprocessingWindow window = new PreprocessingWindow(512, 44100, AccuracyInSamples);
double[] samples = new double[wave.Length + 512];
double[] result = new double[wave.Length / AccuracyInSamples];
Debug.Assert(wave.Read(samples) == wave.Length);
double[] bands = new double[window.OutputSize];
for (int i = 0; i < result.Length; i++)
{
window.Process(samples, i * AccuracyInSamples);
window.PrepareDifferenceFrame(bands, 0);
result[i] = bands.Sum();
}
return(result);
}
}