public override IObservable <Mat> Process(IObservable <Mat> source)
{
return(Observable.Create <Mat>(observer =>
{
var skipCount = 0;
var count = Count;
var skip = Skip.GetValueOrDefault(count);
var activeBuffers = new List <SampleBuffer>();
return source.Subscribe(input =>
{
try
{
// Update pending windows
activeBuffers.RemoveAll(buffer =>
{
buffer.Update(input, 0);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
return true;
}
return false;
});
var index = 0;
while ((index + skipCount) < input.Cols)
{
// Create new window and reset skip counter
index += skipCount;
skipCount = skip;
var buffer = new SampleBuffer(input, count, index);
buffer.Update(input, index);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
}
// Window is missing data, add to list
else
{
activeBuffers.Add(buffer);
}
}
// Remove remainder of input samples from skip counter
skipCount -= input.Cols - index;
}
catch (Exception ex)
{
observer.OnError(ex);
}
},
error => observer.OnError(error),
() => observer.OnCompleted());
}));
}
static SampleBuffer UpdateBuffer(SampleBuffer buffer, Mat source, int index, int delay, double threshold)
{
var samplesTaken = buffer.Update(source, index);
if (buffer.Completed && !buffer.Refined)
{
double min, max;
Point minLoc, maxLoc;
var waveform = buffer.Samples;
CV.MinMaxLoc(waveform, out min, out max, out minLoc, out maxLoc);
var offset = threshold > 0 ? maxLoc.X - delay : minLoc.X - delay;
if (offset > 0)
{
var offsetBuffer = new SampleBuffer(waveform, waveform.Cols, buffer.SampleIndex + offset);
offsetBuffer.Refined = true;
offsetBuffer.Update(waveform, offset);
offsetBuffer.Update(source, index + samplesTaken + offset);
return(offsetBuffer);
}
}
return(buffer);
}
public override IObservable <Mat> Process(IObservable <Tuple <Mat, Mat> > source)
{
return(Observable.Create <Mat>(observer =>
{
bool active = false;
var activeBuffers = new List <SampleBuffer>();
return source.Subscribe(input =>
{
try
{
var data = input.Item1;
var trigger = input.Item2;
// Update pending windows
activeBuffers.RemoveAll(buffer =>
{
buffer.Update(data, 0);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
return true;
}
return false;
});
// Check if new triggers have arrived
var nonZero = CV.CountNonZero(trigger);
if (nonZero <= 0)
{
active = false;
}
else
{
var triggerBuffer = new byte[trigger.Cols];
var triggerHandle = GCHandle.Alloc(triggerBuffer, GCHandleType.Pinned);
using (var triggerHeader = new Mat(1, triggerBuffer.Length, Depth.U8, 1, triggerHandle.AddrOfPinnedObject()))
{
CV.Convert(trigger, triggerHeader);
triggerHandle.Free();
}
for (int i = 0; i < triggerBuffer.Length; i++)
{
var triggerHigh = triggerBuffer[i] > 0;
if (triggerHigh && !active)
{
var buffer = new SampleBuffer(data, Count, i);
buffer.Update(data, i);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
}
// Window is missing data, add to list
else
{
activeBuffers.Add(buffer);
}
}
active = triggerHigh;
}
}
}
catch (Exception ex)
{
observer.OnError(ex);
}
},
error => observer.OnError(error),
() => observer.OnCompleted());
}));
}