Hide V4L2 controls if not present at the camera

Not all controls are available on all cameras. Be sure to show
only the ones that apply to the camera used.

While here, fix the callback logic for whitebalance

1 files changed, 10 insertions, 0 deletions

diff --git a/src/v4l.c b/src/v4l.c
index f265512..47c0fe6 100644
--- a/src/v4l.c
+++ b/src/v4l.c
@@ -173,30 +173,40 @@ void get_pic_info(cam * cam){
       cam->hue = i;
       if(cam->debug == TRUE)
          printf("hue = %d\n", cam->hue);
+   } else {
+      cam->hue = -1;
    }
    i = v4l2_get_control(cam->dev, V4L2_CID_SATURATION);
    if (i >= 0) {
       cam->colour = i;
       if(cam->debug == TRUE)
          printf("colour = %d\n", cam->colour);
+   } else {
+      cam->colour = -1;
    }
    i = v4l2_get_control(cam->dev, V4L2_CID_CONTRAST);
    if (i >= 0) {
       cam->contrast = i;
       if(cam->debug == TRUE)
          printf("contrast = %d\n", cam->contrast);
+   } else {
+      cam->contrast = -1;
    }
    i = v4l2_get_control(cam->dev, V4L2_CID_WHITENESS);
    if (i >= 0) {
       cam->whiteness = i;
       if(cam->debug == TRUE)
          printf("whiteness = %d\n", cam->whiteness);
+   } else {
+      cam->whiteness = -1;
    }
    i = v4l2_get_control(cam->dev, V4L2_CID_BRIGHTNESS);
    if (i >= 0) {
       cam->brightness = i;
       if(cam->debug == TRUE)
          printf("brightness = %d\n", cam->brightness);
+   } else {
+      cam->brightness = -1;
    }
 }