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());
}));
}