fix: debug display buffer index

Author: florian6973

Plugins/LfpDisplayNode/LfpDisplayCanvas.cpp

@@ -1584,15 +1584,28 @@ float LfpDisplaySplitter::getStd(int chan)
     // use 0.1s of sample to compute Mean and Std
     float totalPoints = 0.1 * sampleRate;
 
+    //LOGD("DisplayBufferIndex ", displayBufferIndex[chan], " - ", totalPoints, " points required");
+
     // avoid crash if no signal
-    if ((displayBufferIndex[chan] - totalPoints) <= 0)
-        return 0;
+    //if ((displayBufferIndex[chan] - totalPoints) <= 0) {
+    //    LOGD("\tReturning ", 0);
+    //    return 0;
+    //}
 
     for (int samp = displayBufferIndex[chan] - totalPoints; samp < displayBufferIndex[chan]; samp += 1)
     {
-        std += pow((*displayBuffer->getReadPointer(chan, samp) - mean),2);
+        float value = 0;
+
+        if (samp >= 0)
+            value = *displayBuffer->getReadPointer(chan, samp);
+        else
+            value = *displayBuffer->getReadPointer(chan, displayBuffer->getNumSamples() - samp);
+
+        std += pow((value - mean),2);
+        //LOGD("\tval ", *displayBuffer->getReadPointer(chan, samp));
         numPts++;
     }
+    LOGD("\tReturning ", sqrt(std / numPts));
 
     return sqrt(std / numPts);