/** computes the estimated event rate for a packet of events */
private void computeEstimatedEventRate(AEPacketRaw events) {
if (events == null || events.getNumEvents() < 2) {
estimatedEventRate = 0;
} else {
int[] ts = events.getTimestamps();
int n = events.getNumEvents();
int dt = ts[n - 1] - ts[0];
estimatedEventRate = (int) (1e6f * (float) n / (float) dt);
}
}
/**
* extracts the meaning of the raw events.
*
* @param in the raw events, can be null
* @return out the processed events. these are partially processed in-place. empty packet is
* returned if null is supplied as in.
*/
@Override
public synchronized EventPacket extractPacket(AEPacketRaw in) {
if (out == null) {
out = new EventPacket<PolarityEvent>(chip.getEventClass());
} else {
out.clear();
}
if (in == null) {
return out;
}
int n = in.getNumEvents(); // addresses.length;
int skipBy = 1;
if (isSubSamplingEnabled()) {
while (n / skipBy > getSubsampleThresholdEventCount()) {
skipBy++;
}
}
int[] a = in.getAddresses();
int[] timestamps = in.getTimestamps();
OutputEventIterator outItr = out.outputIterator();
for (int i = 0; i < n; i += skipBy) { // bug here
int addr = a[i];
PolarityEvent e = (PolarityEvent) outItr.nextOutput();
e.address = addr;
e.timestamp = (timestamps[i]);
e.x = (short) (((addr & XMASK) >>> XSHIFT));
e.y = (short) ((addr & YMASK) >>> YSHIFT);
e.type = (byte) (addr & 1);
e.polarity = e.type == 1 ? PolarityEvent.Polarity.Off : PolarityEvent.Polarity.On;
if (e.x < 0 || e.x >= sizeX || e.y < 0 || e.y >= sizeY) {
log.warning(
e.toString()
+ " is outside size of chip"); // TODO should remove for speed once problems with
// y address outside legal range are sorted out
}
}
return out;
}
