update components

dashboard-ui/bower_components/hls.js/src/utils/ewma.js

@@ -0,0 +1,37 @@
+/*
+ * compute an Exponential Weighted moving average
+ * - https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
+ *  - heavily inspired from shaka-player
+ */
+
+class EWMA {
+
+ //  About half of the estimated value will be from the last |halfLife| samples by weight.
+  constructor(halfLife) {
+    // Larger values of alpha expire historical data more slowly.
+    this.alpha_ = halfLife ? Math.exp(Math.log(0.5) / halfLife) : 0;
+    this.estimate_ = 0;
+    this.totalWeight_ = 0;
+  }
+
+  sample(weight,value) {
+    var adjAlpha = Math.pow(this.alpha_, weight);
+    this.estimate_ = value * (1 - adjAlpha) + adjAlpha * this.estimate_;
+    this.totalWeight_ += weight;
+  }
+
+  getTotalWeight() {
+    return this.totalWeight_;
+  }
+
+  getEstimate() {
+    if (this.alpha_) {
+      var zeroFactor = 1 - Math.pow(this.alpha_, this.totalWeight_);
+      return this.estimate_ / zeroFactor;
+    } else {
+      return this.estimate_;
+    }
+  }
+}
+
+export default EWMA;