private static void Controller_SamplesAvailable(object sender, SamplesAvailableEventArgs samps)
{
// IF RX Mode
if (iqStream == null)
{
iqStream = new ComplexFifoStream(BlockMode.None);
}
if (iqStream.Length < SampleRate)
{
iqStream.Write(samps.Buffer, samps.Length);
}
else
{
_droppedBuffers++;
}
if (iqStream != null)
{
iqStream.Read(_rxBufferPtr, (int)SampleRate);
for (int i = 0; i < SampleRate; i++)
{
Console.WriteLine(String.Format("{0:0.000000}\t{1:0.000000}", _rxBufferPtr[i].Real, _rxBufferPtr[i].Imag));
//Console.WriteLine($"{_bufferPtr[i].Imag} {_bufferPtr[i].Real}");
}
}
// TO DO if TX Mode
//if (TXmode)
//{
// samps.Buffer =
//}
}
private void ProcessFFT(object parameter)
{
while (_control.IsPlaying && _fftThreadRunning)
{
#region Configure
if (_sampleRate == 0.0)
{
// WTF???
Thread.Sleep(1);
continue;
}
var fftRate = _fftBins / (_fftTimer.Interval * 0.001);
_fftOverlapRatio = _sampleRate / fftRate;
var samplesToConsume = (int)(_fftBins * _fftOverlapRatio);
_fftSamplesPerFrame = Math.Min(samplesToConsume, _fftBins);
var excessSamples = samplesToConsume - _fftSamplesPerFrame;
_maxIQSamples = (int)(samplesToConsume / (double)_fftTimer.Interval * 100 * /*_streamControl.BufferSizeInMs **/ 1.5);
#endregion
#region Shift data for overlapped mode)
if (_fftSamplesPerFrame < _fftBins)
{
Utils.Memcpy(_iqPtr, _iqPtr + _fftSamplesPerFrame, (_fftBins - _fftSamplesPerFrame) * sizeof(Complex));
}
#endregion
#region Read IQ data
var targetLength = _fftSamplesPerFrame;
var total = 0;
while (_control.IsPlaying && total < targetLength && _fftThreadRunning)
{
var len = targetLength - total;
total += _iqStream.Read(_iqPtr, _fftBins - targetLength + total, len);
}
_iqStream.Advance(excessSamples);
#endregion
if (!_fftSpectrumAvailable)
{
#region Process FFT gain
// http://www.designnews.com/author.asp?section_id=1419&doc_id=236273&piddl_msgid=522392
var fftGain = (float)(10.0 * Math.Log10((double)_fftBins / 2));
var compensation = 24.0f - fftGain + _fftOffset;
#endregion
#region Calculate FFT
Utils.Memcpy(_fftPtr, _iqPtr, _fftBins * sizeof(Complex));
Fourier.ApplyFFTWindow(_fftPtr, _fftWindowPtr, _fftBins);
Fourier.ForwardTransform(_fftPtr, _fftBins);
Fourier.SpectrumPower((Complex *)_fftPtr, (float *)_fftSpectrumPtr, (int)_fftBins, (float)compensation);
#endregion
_fftSpectrumAvailable = true;
}
if (_iqStream.Length <= _maxIQSamples)
{
_fftBufferIsWaiting = true;
_fftEvent.WaitOne();
}
}
_iqStream.Flush();
}
