[PATCH] v4l2-ctl: print delta to current clock in verbose mode

[Max Schulze <max.schulze@xxxxxxxxx>]

If the Buffer Timestamp Clock is _MONOTONIC, print the delta
to the current clock time. Useful for debugging / insights.


Signed-off-by: Max Schuze <max.schulze@xxxxxxxxx>
---
 utils/v4l2-ctl/v4l2-ctl-streaming.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp 
b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
index a3580595..d024f925 100644
--- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
@@ -556,9 +556,15 @@ static void print_concise_buffer(FILE *f, 
cv4l_buffer &buf, cv4l_fmt &fmt,
         double ts = buf.g_timestamp().tv_sec + 
buf.g_timestamp().tv_usec / 1000000.0;
         fprintf(f, " ts: %.06f", ts);
         if (last_ts <= 0.0)
-            fprintf(f, " delta: %.03f ms", (ts - last_ts) * 1000.0);
+            fprintf(f, " delta last: %.03f ms", (ts - last_ts) * 1000.0);
         last_ts = ts;

+        if ((buf.g_flags() & V4L2_BUF_FLAG_TIMESTAMP_MASK) == 
V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC) {
+            timespec ts_clock;
+            clock_gettime(CLOCK_MONOTONIC, &ts_clock);
+            fprintf(f, " delta now: %+.03f ms", ((ts_clock.tv_sec + 
ts_clock.tv_nsec / 1000000000.0) - ts) * 1000.0);
+        }
+
         if (fps_ts.has_fps(true))
             fprintf(stderr, " fps: %.02f", fps_ts.fps());

--
2.29.0