public ICanvasImage Render(string selectedFile, IPeakProvider peakProvider, WaveFormRendererSettings settings)
{
using (var reader = new MediaFoundationReader(selectedFile))
{
int bytesPerSample = (reader.WaveFormat.BitsPerSample / 8);
var samples = reader.Length / (bytesPerSample);
var samplesPerPixel = (int)(samples / settings.Width);
var stepSize = settings.PixelsPerPeak + settings.SpacerPixels;
peakProvider.Init(reader.ToSampleProvider(), samplesPerPixel * stepSize);
return(Render(peakProvider, settings));
}
}
private static ICanvasImage Render(IPeakProvider peakProvider, WaveFormRendererSettings settings)
{
if (settings.DecibelScale)
{
peakProvider = new DecibelPeakProvider(peakProvider, 48);
}
var b = new CanvasRenderTarget(settings.Device, settings.Width, settings.TopHeight + settings.BottomHeight, 96);
using (var ds = b.CreateDrawingSession())
{
if (settings.BackgroundColor == Colors.Transparent)
{
ds.Clear(Colors.Transparent);
}
ds.FillRectangle(0, 0, (float)b.Bounds.Width, (float)b.Bounds.Height, settings.BackgroundBrush);
var midPoint = settings.TopHeight;
int x = 0;
var currentPeak = peakProvider.GetNextPeak();
while (x < settings.Width)
{
var nextPeak = peakProvider.GetNextPeak();
for (int n = 0; n < settings.PixelsPerPeak; n++)
{
var lineHeight = settings.TopHeight * currentPeak.Max;
ds.DrawPen(settings.TopPeakPen, x, midPoint, x, midPoint - lineHeight);
lineHeight = settings.BottomHeight * currentPeak.Min;
ds.DrawPen(settings.BottomPeakPen, x, midPoint, x, midPoint - lineHeight);
x++;
}
for (int n = 0; n < settings.SpacerPixels; n++)
{
// 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;
ds.DrawPen(settings.TopSpacerPen, x, midPoint, x, midPoint - lineHeight);
lineHeight = settings.BottomHeight * min;
ds.DrawPen(settings.BottomSpacerPen, x, midPoint, x, midPoint - lineHeight);
x++;
}
currentPeak = nextPeak;
}
}
return(b);
}
public async Task <ICanvasImage> RenderAsync(StorageFile selectedFile, IPeakProvider peakProvider, WaveFormRendererSettings settings)
{
var randomAcessStream = await selectedFile.OpenReadAsync();
using (var reader = new StreamMediaFoundationReader(randomAcessStream.AsStream()))
{
int bytesPerSample = (reader.WaveFormat.BitsPerSample / 8);
var samples = reader.Length / (bytesPerSample);
var samplesPerPixel = (int)(samples / settings.Width);
var stepSize = settings.PixelsPerPeak + settings.SpacerPixels;
peakProvider.Init(reader.ToSampleProvider(), samplesPerPixel * stepSize);
return(Render(peakProvider, settings));
}
}
public Task <ICanvasImage> RenderAsync(StorageFile selectedFile, WaveFormRendererSettings settings)
{
return(RenderAsync(selectedFile, new MaxPeakProvider(), settings));
}
public ICanvasImage Render(string selectedFile, WaveFormRendererSettings settings)
{
return(Render(selectedFile, new MaxPeakProvider(), settings));
}
