public Image Render(string selectedFile, IPeakProvider peakProvider, WaveFormRendererSettings settings, CancellationToken?ct = null)
{
ct?.ThrowIfCancellationRequested();
using (var reader = new AudioFileReader(selectedFile))
{
int bytesPerSample = (reader.WaveFormat.BitsPerSample / 8);
var samples = reader.Length / (bytesPerSample);
var samplesPerPixel = (int)(samples / settings.Width);
var stepSize = settings.PixelsPerPeak + settings.SpacerPixels;
ct?.ThrowIfCancellationRequested();
peakProvider.Init(reader, samplesPerPixel * stepSize);
return(Render(peakProvider, settings, ct));
}
}
public Image Render(string selectedFile, WaveFormRendererSettings settings)
{
return(Render(selectedFile, new MaxPeakProvider(), settings));
}
private static Image Render(IPeakProvider peakProvider, WaveFormRendererSettings settings, CancellationToken?ct = null)
{
ct?.ThrowIfCancellationRequested();
if (settings.DecibelScale)
{
peakProvider = new DecibelPeakProvider(peakProvider, 48);
}
var b = new Bitmap(settings.Width, settings.TopHeight + settings.BottomHeight);
if (settings.BackgroundColor == Color.Transparent)
{
b.MakeTransparent();
}
ct?.ThrowIfCancellationRequested();
using (var g = Graphics.FromImage(b))
{
g.FillRectangle(settings.BackgroundBrush, 0, 0, b.Width, b.Height);
var midPoint = settings.TopHeight;
int x = 0;
var currentPeak = peakProvider.GetNextPeak();
while (x < settings.Width)
{
ct?.ThrowIfCancellationRequested();
var nextPeak = peakProvider.GetNextPeak();
for (int n = 0; n < settings.PixelsPerPeak; n++)
{
ct?.ThrowIfCancellationRequested();
var lineHeight = settings.TopHeight * currentPeak.Max;
if (settings.TopPeakPen != null)
{
g.DrawLine(settings.TopPeakPen, x, midPoint, x, midPoint - lineHeight);
}
lineHeight = settings.BottomHeight * currentPeak.Min;
if (settings.BottomPeakPen != null)
{
g.DrawLine(settings.BottomPeakPen, x, midPoint, x, midPoint - lineHeight);
}
x++;
}
for (int n = 0; n < settings.SpacerPixels; n++)
{
ct?.ThrowIfCancellationRequested();
// spacer bars are always the lower of the
var max = Math.Min(currentPeak.Max, nextPeak.Max);
var min = Math.Max(currentPeak.Min, nextPeak.Min);
var lineHeight = settings.TopHeight * max;
if (settings.TopSpacerPen != null)
{
g.DrawLine(settings.TopSpacerPen, x, midPoint, x, midPoint - lineHeight);
}
lineHeight = settings.BottomHeight * min;
if (settings.BottomSpacerPen != null)
{
g.DrawLine(settings.BottomSpacerPen, x, midPoint, x, midPoint - lineHeight);
}
x++;
}
currentPeak = nextPeak;
}
}
return(b);
}
