device/raspivid: implement IsRunning method for raspivid

device/raspivid/raspivid.go

@@ -112,6 +112,7 @@ type Raspivid struct {
 	out       io.ReadCloser
 	log       config.Logger
 	done      chan struct{}
+	isRunning bool
 }
 
 // New returns a new Raspivid.
@@ -287,6 +288,7 @@ func (r *Raspivid) Start() error {
 	if err != nil {
 		return fmt.Errorf("could not start raspivid command: %w", err)
 	}
+	r.isRunning = true
 
 	return nil
 }
@@ -310,11 +312,11 @@ func (r *Raspivid) Stop() error {
 	if err != nil {
 		return fmt.Errorf("could not kill raspivid process: %w", err)
 	}
+	r.isRunning = false
 	return r.out.Close()
 }
 
 // IsRunning is used to determine if the pi's camera is running.
 func (r *Raspivid) IsRunning() bool {
-	panic("not implemented")
-	return false
+	return r.isRunning
 }