public void FadeDurationCanBeLongerThanOneRead()
{
var source = new TestSampleProvider(10, 1); // 10 samples per second
source.UseConstValue = true;
source.ConstValue = 100;
var fade = new FadeInOutSampleProvider(source);
fade.BeginFadeIn(1000);
float[] buffer = new float[4];
int read = fade.Read(buffer, 0, 4);
Assert.AreEqual(4, read);
Assert.AreEqual(0, buffer[0]); // start of fade-in
Assert.AreEqual(10, buffer[1]);
Assert.AreEqual(20, buffer[2], 0.0001);
Assert.AreEqual(30, buffer[3], 0.0001);
read = fade.Read(buffer, 0, 4);
Assert.AreEqual(4, read);
Assert.AreEqual(40, buffer[0], 0.0001);
Assert.AreEqual(50, buffer[1], 0.0001);
Assert.AreEqual(60, buffer[2], 0.0001);
Assert.AreEqual(70, buffer[3], 0.0001);
read = fade.Read(buffer, 0, 4);
Assert.AreEqual(4, read);
Assert.AreEqual(80, buffer[0], 0.0001);
Assert.AreEqual(90, buffer[1], 0.0001);
Assert.AreEqual(100, buffer[2], 0.0001);
Assert.AreEqual(100, buffer[3]);
}
public void BufferIsZeroedAfterFadeOut()
{
var source = new TestSampleProvider(10, 1); // 10 samples per second
source.UseConstValue = true;
source.ConstValue = 100;
var fade = new FadeInOutSampleProvider(source);
fade.BeginFadeOut(1000);
float[] buffer = new float[20];
int read = fade.Read(buffer, 0, 20);
Assert.AreEqual(20, read);
Assert.AreEqual(100, buffer[0]); // start of fade-in
Assert.AreEqual(50, buffer[5]); // half-way
Assert.AreEqual(0, buffer[10]); // half-way
read = fade.Read(buffer, 0, 20);
Assert.AreEqual(20, read);
Assert.AreEqual(0, buffer[0]);
}
public void FadeWorksOverSamplePairs()
{
var source = new TestSampleProvider(10, 2); // 10 samples per second
source.UseConstValue = true;
source.ConstValue = 100;
var fade = new FadeInOutSampleProvider(source);
fade.BeginFadeIn(1000);
float[] buffer = new float[20];
int read = fade.Read(buffer, 0, 20);
Assert.AreEqual(20, read);
Assert.AreEqual(0, buffer[0]); // start of fade-in
Assert.AreEqual(0, buffer[1]); // start of fade-in
Assert.AreEqual(50, buffer[10]); // half-way
Assert.AreEqual(50, buffer[11]); // half-way
Assert.AreEqual(90, buffer[18], 0.0001); // fully fade in
Assert.AreEqual(90, buffer[19], 0.0001); // fully fade in
}