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-rw-r--r--yavta.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/yavta.c b/yavta.c
index 2a166c6..8e9ecc4 100644
--- a/yavta.c
+++ b/yavta.c
@@ -25,6 +25,7 @@
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
+#include <sched.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/select.h>
@@ -1012,6 +1013,7 @@ static void usage(const char *argv0)
printf("-p, --pause Pause before starting the video stream\n");
printf("-q, --quality n MJPEG quality (0-100)\n");
printf("-r, --get-control ctrl Get control 'ctrl'\n");
+ printf("-R, --realtime=[priority] Enable realtime RR scheduling\n");
printf("-s, --size WxH Set the frame size\n");
printf("-t, --time-per-frame num/denom Set the time per frame (eg. 1/25 = 25 fps)\n");
printf("-u, --userptr Use the user pointers streaming method\n");
@@ -1050,6 +1052,7 @@ static struct option opts[] = {
{"quality", 1, 0, 'q'},
{"get-control", 1, 0, 'r'},
{"requeue-last", 0, 0, OPT_REQUEUE_LAST},
+ {"realtime", 2, 0, 'R'},
{"size", 1, 0, 's'},
{"set-control", 1, 0, 'w'},
{"skip", 1, 0, OPT_SKIP_FRAMES},
@@ -1061,6 +1064,7 @@ static struct option opts[] = {
int main(int argc, char *argv[])
{
+ struct sched_param sched;
struct device dev;
int ret;
@@ -1071,6 +1075,7 @@ int main(int argc, char *argv[])
int do_enum_inputs = 0, do_set_input = 0;
int do_list_controls = 0, do_get_control = 0, do_set_control = 0;
int do_sleep_forever = 0, do_requeue_last = 0;
+ int do_rt = 0;
int no_query = 0;
char *endptr;
int c;
@@ -1095,8 +1100,10 @@ int main(int argc, char *argv[])
unsigned int delay = 0, nframes = (unsigned int)-1;
const char *filename = "frame";
+ unsigned int rt_priority = 1;
+
opterr = 0;
- while ((c = getopt_long(argc, argv, "c::d:f:F::hi:ln:pq:r:s:t:uw:", opts, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "c::d:f:F::hi:ln:pq:r:R::s:t:uw:", opts, NULL)) != -1) {
switch (c) {
case 'c':
@@ -1149,6 +1156,11 @@ int main(int argc, char *argv[])
}
do_get_control = 1;
break;
+ case 'R':
+ do_rt = 1;
+ if (optarg)
+ rt_priority = atoi(optarg);
+ break;
case 's':
do_set_format = 1;
width = strtol(optarg, &endptr, 10);
@@ -1308,6 +1320,14 @@ int main(int argc, char *argv[])
getchar();
}
+ if (do_rt) {
+ memset(&sched, 0, sizeof sched);
+ sched.sched_priority = rt_priority;
+ ret = sched_setscheduler(0, SCHED_RR, &sched);
+ if (ret < 0)
+ printf("Failed to select RR scheduler (%d)\n", errno);
+ }
+
if (video_do_capture(&dev, nframes, skip, delay, filename, do_requeue_last) < 0) {
video_close(&dev);
return 1;