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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2011-10-25 10:14:22 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2011-10-25 10:14:22 +0200
commit9aa07bd7bae08345e213c201021c9e29b67627b2 (patch)
tree91ac64790668a473830ce1d45b7cc4dec0611df5 /yavta.c
parent43a7e1cb55a892760200fccc258eac5526314f97 (diff)
Use monotonic clock to retrieve timestamps
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'yavta.c')
-rw-r--r--yavta.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/yavta.c b/yavta.c
index ffb7c1b..893fa4e 100644
--- a/yavta.c
+++ b/yavta.c
@@ -26,6 +26,7 @@
#include <errno.h>
#include <getopt.h>
#include <sched.h>
+#include <time.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/select.h>
@@ -949,9 +950,9 @@ static int video_do_capture(struct device *dev, unsigned int nframes,
int do_requeue_last, enum buffer_fill_mode fill)
{
char *filename = NULL;
- struct timeval start;
+ struct timespec start;
struct timeval last;
- struct timeval ts;
+ struct timespec ts;
struct v4l2_buffer buf;
unsigned int size;
unsigned int i;
@@ -970,8 +971,9 @@ static int video_do_capture(struct device *dev, unsigned int nframes,
video_enable(dev, 1);
size = 0;
- gettimeofday(&start, NULL);
- last = start;
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ last.tv_sec = start.tv_sec;
+ last.tv_usec = start.tv_nsec / 1000;
for (i = 0; i < nframes; ++i) {
/* Dequeue a buffer. */
@@ -1004,11 +1006,11 @@ static int video_do_capture(struct device *dev, unsigned int nframes,
+ buf.timestamp.tv_usec - last.tv_usec;
fps = fps ? 1000000.0 / fps : 0.0;
- gettimeofday(&ts, NULL);
+ clock_gettime(CLOCK_MONOTONIC, &ts);
printf("%u (%u) [%c] %u %u bytes %ld.%06ld %ld.%06ld %.3f fps\n", i, buf.index,
(buf.flags & V4L2_BUF_FLAG_ERROR) ? 'E' : '-',
buf.sequence, buf.bytesused, buf.timestamp.tv_sec,
- buf.timestamp.tv_usec, ts.tv_sec, ts.tv_usec, fps);
+ buf.timestamp.tv_usec, ts.tv_sec, ts.tv_nsec/1000, fps);
last = buf.timestamp;
@@ -1048,21 +1050,21 @@ static int video_do_capture(struct device *dev, unsigned int nframes,
goto done;
}
- if (ts.tv_sec == start.tv_sec && ts.tv_usec == start.tv_usec)
+ if (ts.tv_sec == start.tv_sec && ts.tv_nsec == start.tv_nsec)
goto done;
ts.tv_sec -= start.tv_sec;
- ts.tv_usec -= start.tv_usec;
- if (ts.tv_usec < 0) {
+ ts.tv_nsec -= start.tv_nsec;
+ if (ts.tv_nsec < 0) {
ts.tv_sec--;
- ts.tv_usec += 1000000;
+ ts.tv_nsec += 1000000000;
}
- bps = size/(ts.tv_usec+1000000.0*ts.tv_sec)*1000000.0;
- fps = i/(ts.tv_usec+1000000.0*ts.tv_sec)*1000000.0;
+ bps = size/(ts.tv_nsec/1000.0+1000000.0*ts.tv_sec)*1000000.0;
+ fps = i/(ts.tv_nsec/1000.0+1000000.0*ts.tv_sec)*1000000.0;
printf("Captured %u frames in %lu.%06lu seconds (%f fps, %f B/s).\n",
- i, ts.tv_sec, ts.tv_usec, fps, bps);
+ i, ts.tv_sec, ts.tv_nsec/1000, fps, bps);
done:
free(filename);