public void TestDbConversionOfZero()
{
Int16 result = 0;
int dbFS;
dbFS = AudioMath.ConvertToDbfs(result);
Assert.AreEqual(-90, dbFS);
}
public void TestRms2()
{
Int16 result = 0;
Int16[] data = new Int16[] { 10, 9, 8, 10, 9, 8, 10, 9, 8 }; // RMS = 9.03696114115064
result = AudioMath.RootMeanSquare(data);
Assert.AreEqual((Int16)9, result);
}
public void TestRms1()
{
Int16 result = 0;
Int16[] data = new Int16[] { 9, 9, 9, 9, 9, 9, 9, 9, 9 }; // RMS = 9
result = AudioMath.RootMeanSquare(data);
Assert.AreEqual((Int16)9, result);
}
public void TestRmsToDbConversion02()
{
Int16 result = 0;
double dbFS;
Int16[] data = new Int16[] { 30000, 20000, 10000, 0, -5000, -10000, 0, 5000, 10000, 15000, 20000, 25000, 30000, 31000, 31500, 26000 };
result = AudioMath.RootMeanSquare(data);
dbFS = AudioMath.ConvertToDbfs(result);
// If you aren't getting the expected -4 dB, instead getting -90, then you probably have an overflow condition in RMSR.
Assert.AreEqual(-4, dbFS);
}
public void TestRmsHandlesMinValueOverflow()
{
Int16 result = 0;
Int16[] data = new Int16[] { Int16.MinValue, Int16.MinValue, Int16.MinValue, Int16.MinValue, Int16.MinValue, Int16.MinValue, Int16.MinValue };
// Int16.MinValue = -32768 and Int16.Max value = 32767. If only -32768 are sent through a regular RMS calculation, it will effectively ABS the number and result
// in 32768, which exceeds the max value that can be put in a (short) / (Int16). I've modified the rootMeanSquare calculation to try to account for that and if it sees the overflow
// situation, it will set the value to Int16.MaxValue instead.
result = AudioMath.RootMeanSquare(data);
Assert.AreEqual((Int16)32767, result);
}
public void TestRmsToDbConversion01()
{
Int16 result = 0;
int dbFS;
Int16[] data = new Int16[] { Int16.MaxValue, Int16.MaxValue, Int16.MaxValue, Int16.MinValue, Int16.MinValue };
result = AudioMath.RootMeanSquare(data);
// Now, convert that to dBFS
dbFS = AudioMath.ConvertToDbfs(result);
Assert.AreEqual(0, dbFS);
}
