public void Compare_Access_Patterns()
{
int runs = 1000;
var stopWatch = new Stopwatch();
var numSamples = 1024;
var fixture = new AudioSampleBuffer(1, numSamples);
stopWatch.Start();
for (int i = 0; i != runs; ++i)
{
for (int j = 0; j < numSamples; j++)
{
if (_testBuffer[0][j] != 0)
{
Assert.Fail();
}
}
}
stopWatch.Stop();
var arrayTime = stopWatch.ElapsedTicks;
stopWatch.Restart();
for (int i = 0; i != runs; ++i)
{
var readPtr = fixture.GetReadPointer(0);
for (int j = 0; j < numSamples; j++)
{
if (*(readPtr++) != 0)
{
Assert.Fail();
}
}
}
stopWatch.Stop();
var pointerTime = stopWatch.ElapsedTicks;
stopWatch.Restart();
for (int i = 0; i != runs; ++i)
{
for (int j = 0; j < numSamples; j++)
{
if (fixture.GetSample(0, j) != 0)
{
Assert.Fail();
}
}
}
stopWatch.Stop();
var accessorTime = stopWatch.ElapsedTicks;
fixture.Dispose();
Console.WriteLine("Pointer: {0} vs Accessor: {1} vs Array: {2}", pointerTime, accessorTime, arrayTime);
}
public void Can_Write_And_Read_Back()
{
var fixture = new AudioSampleBuffer(2, 1024);
var writePtr = fixture.GetWritePointer(0);
(*writePtr) = 126.0f;
Assert.AreEqual(126.0f, *fixture.GetReadPointer(0));
fixture.Dispose();
}
public void Initial_Buffer_Is_Zeroed_Out()
{
var numSamples = 1024;
using (var fixture = new AudioSampleBuffer(2, numSamples))
{
var readPtr = fixture.GetReadPointer(0);
while (numSamples-- > 0)
{
Assert.AreEqual(0, *(readPtr++));
}
numSamples = 1024;
readPtr = fixture.GetReadPointer(1);
while (numSamples-- > 0)
{
Assert.AreEqual(0, *(readPtr++));
}
}
}
public void Set_Sample_Stores_Value()
{
using (var fixture = new AudioSampleBuffer(2, 1024))
{
var readPtr = fixture.GetReadPointer(1);
fixture.SetSample(1, 20, 127);
Assert.AreEqual(127.0f, *(readPtr + 20));
}
}
public void Add_Sample_Updates_Prior_Value()
{
using (var fixture = new AudioSampleBuffer(2, 1024))
{
var readPtr = fixture.GetReadPointer(1);
fixture.SetSample(1, 20, 127.0f);
fixture.AddSample(1, 20, 23.0f);
Assert.AreEqual(127.0f + 23.0f, *(readPtr + 20));
}
}
public void Can_Clear_Single_Channel()
{
var numSamples = 1024;
using (var fixture = new AudioSampleBuffer(3, numSamples))
{
var readPtr = fixture.GetReadPointer(1);
var writePtr = fixture.GetWritePointer(0);
for (var i = 0; i < 3 * 1024; ++i)
{
*writePtr++ = 127.0f;
}
Assert.AreEqual(127.0f, *readPtr);
fixture.ClearChannel(1);
Assert.AreEqual(0f, *readPtr);
}
}