public void Test16BitSingleChannelRoundTrip()
{
const int samplesPerSecond = 44_100;
const double delta = 1.0 / samplesPerSecond;
Func <double, double> func = (double t) => Math.Cos(2.0 * Math.PI * t);
short[] data = new short[samplesPerSecond];
for (int i = 0; i < samplesPerSecond; ++i)
{
data[i] = (short)(short.MaxValue * func(i * delta));
}
using var ms = new MemoryStream();
var writer = new WaveWriter(ms, samplesPerSecond);
writer.Write(data.Length, data);
ms.Position = 0;
var reader = new WaveReader(ms);
Assert.AreEqual(reader.Format.Channels, 1);
Assert.AreEqual(reader.Format.SamplesPerSecond, samplesPerSecond);
Assert.AreEqual(reader.Format.BitsPerSample, 16);
var channel = reader.GetChannelInt16(0);
int h = 0;
var e = channel.GetEnumerator();
while (e.MoveNext())
{
Assert.AreEqual(data[h++], e.Current, $"Index: {h}");
}
}
public WaveFormView2(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
InitializeComponent();
_Reader = new WaveReader(stream);
for (short i = 0; i < _Reader.Format.Channels; ++i)
{
switch (_Reader.Format.BitsPerSample)
{
case 8: this.wavePlot.plt.PlotSignalConst(_Reader.GetChannelInt8(i).Select(x => (float)x).ToArray()); break;
case 16: this.wavePlot.plt.PlotSignalConst(_Reader.GetChannelInt16(i).Select(x => (float)x).ToArray()); break;
case 32: this.wavePlot.plt.PlotSignalConst(_Reader.GetChannelFloat(i).ToArray()); break;
default:
throw new NotSupportedException($"Invalid sample size: {_Reader.Format.BitsPerSample}.");
}
;
}
this.wavePlot.MouseWheel += WavePlot_MouseWheel;
this.wavePlot.plt.AxisAuto(horizontalMargin: 0, verticalMargin: 0);
}