opencv: read the image frames as fast as possible

Signed-off-by: deadprogram <ron@hybridgroup.com>

platforms/opencv/camera_driver.go

@@ -3,8 +3,6 @@ package opencv
 import (
 	"errors"
 
-	"time"
-
 	"github.com/hybridgroup/gocv"
 	"gobot.io/x/gobot"
 )
@@ -20,22 +18,20 @@ const (
 
 // CameraDriver is the Gobot Driver for the OpenCV camera
 type CameraDriver struct {
-	name     string
-	camera   capture
-	interval time.Duration
-	Source   interface{}
-	start    func(*CameraDriver) (err error)
+	name   string
+	camera capture
+	Source interface{}
+	start  func(*CameraDriver) (err error)
 	gobot.Eventer
 }
 
 // NewCameraDriver creates a new driver with specified source.
 // It also creates a start function to either set camera as a File or Camera capture.
-func NewCameraDriver(source interface{}, v ...time.Duration) *CameraDriver {
+func NewCameraDriver(source interface{}) *CameraDriver {
 	c := &CameraDriver{
-		name:     "Camera",
-		Eventer:  gobot.NewEventer(),
-		Source:   source,
-		interval: 10 * time.Millisecond,
+		name:    "Camera",
+		Eventer: gobot.NewEventer(),
+		Source:  source,
 		start: func(c *CameraDriver) (err error) {
 			switch v := c.Source.(type) {
 			case string:
@@ -49,10 +45,6 @@ func NewCameraDriver(source interface{}, v ...time.Duration) *CameraDriver {
 		},
 	}
 
-	if len(v) > 0 {
-		c.interval = v[0]
-	}
-
 	c.AddEvent(Frame)
 
 	return c
@@ -67,8 +59,7 @@ func (c *CameraDriver) SetName(n string) { c.name = n }
 // Connection returns the Driver's connection
 func (c *CameraDriver) Connection() gobot.Connection { return nil }
 
-// Start initializes camera by grabbing a frame
-// every `interval` and publishing an frame event
+// Start initializes camera by grabbing frames
 func (c *CameraDriver) Start() (err error) {
 	if err := c.start(c); err != nil {
 		return err
@@ -79,7 +70,6 @@ func (c *CameraDriver) Start() (err error) {
 			if ok := c.camera.Read(img); ok {
 				c.Publish(Frame, img)
 			}
-			time.Sleep(c.interval)
 		}
 	}()
 	return