libv4l: whitebalance fix divide by 0 and avoid abrupt changes

From: Hans de Goede <hdegoede@redhat.com>

libv4l: whitebalance fix divide by 0 and avoid abrupt changes

Priority: normal

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/v4l2-apps/libv4l/libv4lconvert/processing/libv4lprocessing.c b/v4l2-apps/libv4l/libv4lconvert/processing/libv4lprocessing.c
index cbbcca73c..af0056e94 100644
--- a/v4l2-apps/libv4l/libv4lconvert/processing/libv4lprocessing.c
+++ b/v4l2-apps/libv4l/libv4lconvert/processing/libv4lprocessing.c
@@ -62,6 +62,8 @@ int v4lprocessing_pre_processing(struct v4lprocessing_data *data)
       data->do_process = 1;
   }
 
+  data->controls_changed |= v4lcontrol_controls_changed(data->control);
+
   return data->do_process;
 }
 
@@ -167,9 +169,10 @@ void v4lprocessing_processing(struct v4lprocessing_data *data,
       return; /* Non supported pix format */
   }
 
-  if (v4lcontrol_controls_changed(data->control) ||
+  if (data->controls_changed ||
       data->lookup_table_update_counter == V4L2PROCESSING_UPDATE_RATE) {
     v4lprocessing_update_lookup_tables(data, buf, fmt);
+    data->controls_changed = 0;
     data->lookup_table_update_counter = 0;
   } else
     data->lookup_table_update_counter++;