add support to passthough mjpeg images

webcam.h

@@ -18,7 +18,7 @@ class Webcam {
 public:
     Webcam(const std::string& device = "/dev/video0", 
            int width = 640, 
-           int height = 480, bool mjpeg = false);
+           int height = 480, bool mjpeg = false, bool passthrough = false);
 
     ~Webcam();
 
@@ -60,6 +60,7 @@ private:
     size_t stride;
 
     bool force_format = true;
+    bool passthrough_format;
     uint32_t format;
 };