public unsafe void Write(int position, void *pBuffer, int length, DSBLOCK flags)
{
IntPtr pvAudioPtr1;
int dwAudioBytes1;
IntPtr pvAudioPtr2;
int dwAudioBytes2;
this.Lock(
position,
length,
out pvAudioPtr1,
out dwAudioBytes1,
out pvAudioPtr2,
out dwAudioBytes2,
flags);
try
{
int count1 = Math.Min(dwAudioBytes1, length);
int count2 = length - count1;
NativeHelper.CPBLK((void *)pvAudioPtr1, (void *)pBuffer, count1);
if (count2 > 0)
{
NativeHelper.CPBLK((void *)(pvAudioPtr1 + count1), (void *)((byte *)pBuffer + count1), count2);
}
}
finally
{
this.Unlock(pvAudioPtr1, dwAudioBytes1, pvAudioPtr2, dwAudioBytes2);
}
}
private bool OnBufferRequest(uint *pBuffer, int sampleCount)
{
uint[] source;
if (!_playQueue.TryDequeue(out source))
{
var sample = _lastSample.HasValue ? _lastSample.Value : _zeroValue;
// TODO: native optimization?
for (var i = 0; i < sampleCount; i++)
{
pBuffer[i] = sample;
}
return(true);
}
try
{
fixed(uint *psrc = source)
{
NativeHelper.CPBLK(pBuffer, psrc, sampleCount * 4);
//NativeMethods.CopyMemory(pBuffer, psrc, sampleCount * 4);
_lastSample = pBuffer[sampleCount - 1];
}
return(true);
}
finally
{
_fillQueue.Enqueue(source);
_frameEvent.Set();
}
}
public unsafe byte[] GetButtons()
{
var offset = 8 * 4 + 4 * 4; // rgbButtons0 offset
var length = sizeof(DIJOYSTATE) - offset;
var button = new byte[length];
fixed(void *pStruct = &this)
fixed(void *pButton = button)
{
NativeHelper.CPBLK(pButton, (byte *)pStruct + offset, length);
}
return(button);
}
public unsafe void SetStringAnsi(string value)
{
if (string.IsNullOrEmpty(value))
{
fixed(void *pDst = &this)
{
*(byte *)pDst = (byte)0;
}
return;
}
var maxLength = Marshal.SizeOf(this);
var length = Math.Min(value.Length, maxLength);
var pSrc = Marshal.StringToHGlobalAnsi(value);
fixed(void *pDst = &this)
{
NativeHelper.CPBLK(pDst, (void *)pSrc, length);
}
Marshal.FreeHGlobal(pSrc);
}