private void timer1_Tick(object sender, EventArgs e)
{
double[] newAudio = listener.GetNewAudio();
spec.Add(newAudio, process: false);
double multiplier = tbBrightness.Value / 20.0;
if (spec.FftsToProcess > 0)
{
Stopwatch sw = Stopwatch.StartNew();
spec.Process();
spec.SetFixedWidth(pbSpectrogram.Width);
Bitmap bmpSpec = new Bitmap(spec.Width, spec.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
using (var bmpSpecIndexed = spec.GetBitmap(multiplier, cbDecibels.Checked, roll: cbRoll.Checked))
using (var gfx = Graphics.FromImage(bmpSpec))
using (var pen = new Pen(Color.White))
{
gfx.DrawImage(bmpSpecIndexed, 0, 0);
if (cbRoll.Checked)
{
gfx.DrawLine(pen, spec.NextColumnIndex, 0, spec.NextColumnIndex, pbSpectrogram.Height);
}
}
sw.Stop();
pbSpectrogram.Image?.Dispose();
pbSpectrogram.Image = bmpSpec;
lblStatus3.Text = $"Render time: {sw.ElapsedMilliseconds:D2} ms";
lblStatus4.Text = $"Peak (Hz): {spec.GetPeak().freqHz:N0}";
}
lblStatus1.Text = $"Time: {listener.TotalTimeSec:N3} sec";
lblStatus2.Text = $"FFTs processed: {spec.FftsProcessed:N0}";
pbAmplitude.Value = (int)(listener.AmplitudeFrac * pbAmplitude.Maximum);
}
public void Test_MelSpectrogram_MelScale()
{
(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");
int fftSize = 4096;
var sg = new SpectrogramGenerator(sampleRate, fftSize, stepSize: 500);
sg.Add(audio);
Bitmap bmpMel = sg.GetBitmapMel(250);
bmpMel.Save("../../../../../dev/graphics/halMel-MelScale.png", ImageFormat.Png);
Bitmap bmpRaw = sg.GetBitmap();
Bitmap bmpCropped = new Bitmap(bmpRaw.Width, bmpMel.Height);
using (Graphics gfx = Graphics.FromImage(bmpCropped))
{
gfx.DrawImage(bmpRaw, 0, bmpMel.Height - bmpRaw.Height);
}
bmpCropped.Save("../../../../../dev/graphics/halMel-LinearCropped.png", ImageFormat.Png);
}
