Think I've finished the actual code, just need to write some testing utilities

bitrate/BitrateCalculator.go

@@ -6,36 +6,33 @@ import (
 )
 
 type BitrateCalculator struct {
-  Delay int
+  Delay int // sec
   now
   prev
   isFirstTime bool
-  elapsedTime time
+  elapsedTime time.Time
 }
 
 // The bitrate calculator
 func (bc *BitrateCalculator) Start() {
-  if isFirstTime {
+  if bc.isFirstTime {
     if Delay == nil {
-      Delay = 5 * time.Second
+      bc.Delay = 5 * time.Second
     }
-    now = time.Now()
-    prev = now
-    isFirstTime = false
-    elapsedTime = time.Duration(0)
+    bc.now = time.Now()
+    bc.prev = now
+    bc.isFirstTime = false
+    bc.elapsedTime = time.Duration(0)
   }
-  now := time.Now()
+  bc.now = time.Now()
 }
 
-func (bc *BitrateCalculator) Stop(noOfKB int, printOption bool) (bitrate int) {
+func (bc *BitrateCalculator) Stop(noOfKB int) (bitrate int) {
   deltaTime := now.Sub(prevTime)
-  elapsedTime += deltaTime
-  if elapsedTime > bitrateOutputDelay*time.Second {
-    bitrate = int64(noOfKB/float64(deltaTime/1e9))
-    if printOption {
-      fmt.Printf("Bitrate: %d kbps\n", bitrate)
+  bc.elapsedTime += deltaTime
+  if bc.elapsedTime > bc.Delay*time.Second {
+    fmt.Printf("Bitrate: %d kbps\n", int64(noOfKB/float64(deltaTime/1e9)))
+    bc.elapsedTime = time.Duration(0)
   }
-    elapsedTime = time.Duration(0)
-  }
-  prevTime = now
+  bc.prev = now
 }