Initial implementation

revid/config/config.go

@@ -265,7 +265,7 @@ type Config struct {
 
 	HorizontalFlip bool  // HorizontalFlip flips video horizontally for Raspivid input.
 	VerticalFlip   bool  // VerticalFlip flips video vertically for Raspivid input.
-	Filter         int  // Defines the method of filtering to be used in between lexing and encoding.
+	Filters        []int // Defines the methods of filtering to be used in between lexing and encoding.
 	PSITime        int   // Sets the time between a packet being sent
 
 	// RTMP ring buffer parameters.

revid/revid.go

@@ -129,8 +129,8 @@ type Revid struct {
 	// lexTo, encoder and packer handle transcoding the input stream.
 	lexTo func(dest io.Writer, src io.Reader, delay time.Duration) error
 
-	// filter will hold the filter interface that will write to the chosen filter from the lexer.
-	filter filter.Filter
+	// filters will hold the filter interface that will write to the chosen filter from the lexer.
+	filters []filter.Filter
 
 	// encoders will hold the multiWriteCloser that writes to encoders from the filter.
 	encoders io.WriteCloser
@@ -346,19 +346,29 @@ func (r *Revid) setupPipeline(mtsEnc func(dst io.WriteCloser, rate float64) (io.
 
 	r.encoders = multiWriter(encoders...)
 
-	switch r.cfg.Filter {
-	case config.FilterNoOp:
-		r.filter = filter.NewNoOp(r.encoders)
-	case config.FilterMOG:
-		r.filter = filter.NewMOGFilter(r.encoders, mogMinArea, mogThreshold, mogHistory, r.cfg.ShowWindows)
-	case config.FilterVariableFPS:
-		r.filter = filter.NewVariableFPSFilter(r.encoders, minFPS, filter.NewMOGFilter(r.encoders, mogMinArea, mogThreshold, mogHistory, r.cfg.ShowWindows))
-	case config.FilterKNN:
-		r.filter = filter.NewKNNFilter(r.encoders, knnMinArea, knnThreshold, knnHistory, knnKernel, r.cfg.ShowWindows)
+	l := len(r.cfg.Filters)
+	r.filters = []filter.Filter{filter.NewNoOp(r.encoders)}
+	if l != 0 {
+		r.filters = make([]filter.Filter, l)
+		dst := r.encoders
 
+		for i := l - 1; i >= 0; i-- {
+			switch r.cfg.Filters[i] {
+			case config.FilterNoOp:
+				r.filters[i] = filter.NewNoOp(dst)
+			case config.FilterMOG:
+				r.filters[i] = filter.NewMOGFilter(dst, mogMinArea, mogThreshold, mogHistory, r.cfg.ShowWindows)
+			case config.FilterVariableFPS:
+				r.filters[i] = filter.NewVariableFPSFilter(dst, minFPS, filter.NewMOGFilter(dst, mogMinArea, mogThreshold, mogHistory, r.cfg.ShowWindows))
+			case config.FilterKNN:
+				r.filters[i] = filter.NewKNNFilter(dst, knnMinArea, knnThreshold, knnHistory, knnKernel, r.cfg.ShowWindows)
 			default:
 				panic("Undefined Filter")
 			}
+			dst = r.filters[i]
+		}
+
+	}
 
 	switch r.cfg.Input {
 	case config.InputRaspivid:
@@ -474,7 +484,7 @@ func (r *Revid) Stop() {
 		r.cfg.Logger.Log(logger.Error, pkg+"failed to close pipeline", "error", err.Error())
 	}
 
-	err = r.filter.Close()
+	//err = r.filter.Close()
 	if err != nil {
 		r.cfg.Logger.Log(logger.Error, pkg+"failed to close pipeline", "error", err.Error())
 	}
@@ -667,13 +677,17 @@ func (r *Revid) Update(vars map[string]string) error {
 			default:
 				r.cfg.Logger.Log(logger.Warning, pkg+"invalid VerticalFlip param", "value", value)
 			}
-		case "Filter":
+		case "Filters":
+			filters := strings.Split(value, ",")
 			m := map[string]int{"NoOp": config.FilterNoOp, "MOG": config.FilterMOG, "VariableFPS": config.FilterVariableFPS, "KNN": config.FilterKNN}
-			v, ok := m[value]
+			r.cfg.Filters = make([]int, len(filters))
+			for i, filter := range filters {
+				v, ok := m[filter]
 				if !ok {
-				r.cfg.Logger.Log(logger.Warning, pkg+"invalid FilterMethod param", "value", value)
+					r.cfg.Logger.Log(logger.Warning, pkg+"invalid Filters param", "value", value)
+				}
+				r.cfg.Filters[i] = v
 			}
-			r.cfg.Filter = v
 		case "PSITime":
 			v, err := strconv.Atoi(value)
 			if err != nil || v < 0 {
@@ -792,7 +806,7 @@ func (r *Revid) Update(vars map[string]string) error {
 // processFrom is run as a routine to read from a input data source, lex and
 // then send individual access units to revid's encoders.
 func (r *Revid) processFrom(read io.Reader, delay time.Duration) {
-	r.err <- r.lexTo(r.filter, read, delay)
+	r.err <- r.lexTo(r.filters[0], read, delay)
 	r.cfg.Logger.Log(logger.Info, pkg+"finished lexing")
 	r.wg.Done()
 }