added 'MotionInterval' that is used instead of 'Interval' when motion is detected on a Stream

stream.go

@@ -22,8 +22,10 @@ type Stream struct {
 	URL            string      `json:"url"`
 	Base64         string      `json:"base64"`
 	Interval       int         `json:"interval"`
+	MotionInterval int         `json:"motionInterval"`
 	WatchAreas     []WatchArea `json:"watchAreas"`
 	Timeouts       float64     `json:"-"`
+	MotionDetected bool        `json:"-"`
 	FileLock       sync.Mutex  `json:"-"`
 }
 
@@ -36,8 +38,10 @@ func NewStream(Name string, URL string) *Stream {
 		URL:            URL,
 		Base64:         base64,
 		Interval:       5000,
+		MotionInterval: 500,
 		WatchAreas:     make([]WatchArea, 0),
 		Timeouts:       0,
+		MotionDetected: false,
 	}
 	stream.WriteStreamJSON()
 	return &stream
@@ -48,6 +52,7 @@ func StreamFromJSON(path string) *Stream {
 	streamJSONFile, _ := ioutil.ReadFile(path)
 	stream := Stream{
 		Timeouts:       0,
+		MotionDetected: false,
 	}
 	json.Unmarshal([]byte(streamJSONFile), &stream)
 	return &stream
@@ -95,13 +100,15 @@ func (s *Stream) Update() {
 	gocv.CvtColor(debug, &debug, gocv.ColorGrayToBGRA)
 
 	contours := gocv.FindContours(diff, gocv.RetrievalExternal, gocv.ChainApproxSimple)
+	s.MotionDetected = false
 	for _, watchArea := range s.WatchAreas {
 		gocv.Rectangle(&debug, watchArea.Area, watchArea.Color, 10)
 		if s.CheckWatchAreas(watchArea.Area, contours) {
+			s.MotionDetected = true
 			go watchArea.CopyInstant(s.GetCurrentColorInstantPath(), *s)
 		}
 	}
-	go gocv.IMWrite(s.GetDebugInstantPath(), debug)
+	gocv.IMWrite(s.GetDebugInstantPath(), debug)
 }
 
 // CheckWatchAreas unexported
@@ -119,12 +126,16 @@ func (s *Stream) CheckWatchAreas(area image.Rectangle, contours [][]image.Point)
 // UpdateInterval calls Update() every interval
 func (s *Stream) UpdateInterval() {
 	for {
-		go s.Update()
+		s.Update()
+		if s.MotionDetected {
+			time.Sleep(time.Duration(s.MotionInterval) * time.Millisecond)
+		} else {
 			expTimeout := math.Pow(2, s.Timeouts)
 			maxExpTimeout := (int)(math.Min(12, expTimeout))
 			time.Sleep(time.Duration(s.Interval*maxExpTimeout) * time.Millisecond)
 		}
 	}
+}
 
 // SaveStreamInstant writes the img to the CurrentStreamInstantPath, moves existing instant to PreviousStreamInstantPath
 func (s *Stream) SaveStreamInstant(mat gocv.Mat) {