public static async Task<WaveFile> Create(StorageFile file)
{
WaveFile w = new WaveFile();
await w.Initialize(file);
w.SmoothSamples(200);
return w;
}
public async Task<bool> DrawWaveform(Canvas canvas)
{
if (this.WaveFile == null)
{
this.WaveFile = await WaveFile.Create(AudioFile);
}
double W = canvas.ActualWidth;
double H = canvas.ActualHeight;
double y_c = H / 2.0;
canvas.Children.Clear();
double dseconds = (1.0 / 16000.0);
double dpixels = PixelsPerSecond * dseconds;
canvas.Width = this.WaveFile.SmoothedSamples.Count * dpixels;
Path path = new Path();
path.Stroke = new SolidColorBrush(Windows.UI.Colors.DeepSkyBlue);
path.StrokeThickness = 2.0;
GeometryGroup geomGroup = new GeometryGroup();
for (int i = 0; i < Samples.Count; ++i)
{
double f = Samples[i];
Point a = new Point((i * dpixels) + 0.5, y_c - f * y_c);
Point b = new Point((i * dpixels) + 0.5, y_c + f * y_c);
LineGeometry line = new LineGeometry();
line.StartPoint = a;
line.EndPoint = b;
geomGroup.Children.Add(line);
}
path.Data = geomGroup;
canvas.Children.Add(path);
return true;
}