private unsafe void SdrSamplesAvailable(object sender, CaptureEventArgs e)
{
/*GCHandle gcHandle = this._gcHandle;
* if (!gcHandle.IsAllocated)
* return;*/
//CyCaptureDevice target = (CyCaptureDevice) gcHandle.Target;
CyCaptureDevice target = this;
int length = (int)e.BytesCaptures;
if (target._iqBuffer == null || target._iqBuffer.Length != length)
{
target._iqBuffer = UnsafeBuffer.Create(length, sizeof(Complex));
target._iqPtr = (Complex *)(void *)target._iqBuffer;
}
float iavg = target._iavg;
float qavg = target._qavg;
float alpha = target._alpha;
Complex *iqPtr = target._iqPtr;
for (int index = 0; index < length; index++)
{
//iqPtr->Real = CyCaptureDevice._lutPtr[*buf++];
//iqPtr->Imag = CyCaptureDevice._lutPtr[*buf++];
iqPtr->Real = captureDevice.ResultBuffer[index];
iqPtr->Imag = captureDevice.ResultBuffer[index];
iavg += alpha * (iqPtr->Real - iavg);
qavg += alpha * (iqPtr->Imag - qavg);
iqPtr->Real -= iavg;
iqPtr->Imag -= qavg;
++iqPtr;
}
target._iavg = iavg;
target._qavg = qavg;
target.ComplexSamplesAvailable(target._iqPtr, target._iqBuffer.Length);
}
public void SelectDevice()
{
this.CloseDevice();
this._device = new CyCaptureDevice();
this._device.Frequency = this._frequency;
this._gui.Device = this._device;
this._device.SamplesAvailable += new SamplesAvailableDelegate(this.captDevice_SamplesAvailable);
this._device.SampleRateChanged += new EventHandler(this.captDevice_SampleRateChanged);
}
private void CloseDevice()
{
if (this._device == null)
{
return;
}
this._device.Stop();
this._device.SamplesAvailable -= new SamplesAvailableDelegate(this.captDevice_SamplesAvailable);
this._device.SampleRateChanged -= new EventHandler(this.captDevice_SampleRateChanged);
this._device.Dispose();
this._device = (CyCaptureDevice)null;
}