public void ReadSpectrogramFrame()
{
double curAudioPos = app.AudioSource.AudioStream.CurrentTime.TotalMilliseconds;
SpectrogramFrame curFrame = SpectrogramHandler.Spectrogram.Frames.Aggregate((x, y) => Math.Abs(x.Timestamp - curAudioPos) < Math.Abs(y.Timestamp - curAudioPos) ? x : y); // Gets the frame with a timestamp closest to curAudioPos
// Converts byte valued spectrogram data to double valued spectrum data
double[] doubleData = new double[curFrame.SpectrumData.Length];
for (int i = 0; i < doubleData.Length; i++)
{
doubleData[i] = curFrame.SpectrumData[i];
}
spectrumData = doubleData;
foreach (Note note in curFrame.Notes)
{
Analyser.BufferNote(note.NoteIndex);
Analyser.GetMusic().CountNote(note.Name + "0");
}
// Directly assigns analyser properties from current spectrogram frame
Analyser.Notes = curFrame.Notes.ToList();
Analyser.Chords = curFrame.Chords.ToList();
Analyser.CurrentKey = curFrame.KeySignature;
Analyser.CalculateNotePercentages();
FrequencyAnalysisToSpectrum(SpectrogramHandler.Spectrogram.FrequencyScale);
curFrame = null;
doubleData = null;
spectrumData = null;
GC.Collect();
}
private void GenerateSpectrogramImage()
{
if (MySpectrogramHandler == null)
{
return;
}
spectrogramImage = new Bitmap(MySpectrogramHandler.Spectrogram.Frames.Count, MySpectrogramHandler.Spectrogram.FrequencyBins);
projectionRect = new RectangleF(0, 0, spectrogramImage.Width, spectrogramImage.Height);
binsPerPixel = (float)spectrogramImage.Height / this.Height;
framesPerPixel = (float)spectrogramImage.Width / this.Width;
byte pixelVal;
for (int i = 0; i < MySpectrogramHandler.Spectrogram.Frames.Count; i++)
{
SpectrogramFrame frame = MySpectrogramHandler.Spectrogram.Frames[i];
for (int j = 0; j < MySpectrogramHandler.Spectrogram.FrequencyBins; j++)
{
pixelVal = frame.SpectrumData[j];
spectrogramImage.SetPixel(i, MySpectrogramHandler.Spectrogram.FrequencyBins - 1 - j, Color.FromArgb(pixelVal, pixelVal, pixelVal));
}
}
}
