Also put frame_average into util

Not yet needed by other tools than cuttime,
but its really just a utility function.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/util.h b/src/util.h
index bc926b6..4666b06 100644
--- a/src/util.h
+++ b/src/util.h
@@ -26,6 +26,9 @@ frame_mix(struct video_frame *frame_a, struct video_frame *frame_b);
 double
 frame_diff(struct video_frame *frame_a, struct video_frame *frame_b);
 
+double
+frame_average(struct video_frame *frame);
+
 void
 print_time(int64_t msec);