Calculate the limit delay once and for all

[experiments/fps-limit.git] / fps-limit.h

diff --git a/fps-limit.h b/fps-limit.h
index 376fb77..d19df1c 100644 (file)
--- a/fps-limit.h
+++ b/fps-limit.h
@@ -50,7 +50,7 @@
 struct fps_limit_stats {
        struct timespec time_start;
        struct timespec time_end;
 struct fps_limit_stats {
        struct timespec time_start;
        struct timespec time_end;

-       unsigned int fps;
+       unsigned int delay;

 };
 
 static void fps_limit_init(struct fps_limit_stats *stats, unsigned int fps)
 };
 
 static void fps_limit_init(struct fps_limit_stats *stats, unsigned int fps)


@@ -60,7 +60,7 @@ static void fps_limit_init(struct fps_limit_stats *stats, unsigned int fps)
        clock_gettime(CLOCK_MONOTONIC, &stats->time_start);
        fps_limit_dbg("Init time: s: %ld, ns: %ld", stats->time_start.tv_sec, stats->time_start.tv_nsec);
 
        clock_gettime(CLOCK_MONOTONIC, &stats->time_start);
        fps_limit_dbg("Init time: s: %ld, ns: %ld", stats->time_start.tv_sec, stats->time_start.tv_nsec);
 

-       stats->fps = fps;
+       stats->delay = NSEC_PER_SEC / fps;

 }
 
 static void fps_limit_sleep(struct fps_limit_stats *stats)
 }
 
 static void fps_limit_sleep(struct fps_limit_stats *stats)


@@ -75,11 +75,11 @@ static void fps_limit_sleep(struct fps_limit_stats *stats)
        fps_limit_timespecsub(&stats->time_end, &stats->time_start, &elapsed);
        fps_limit_dbg("Elapsed s: %ld ns: %ld", elapsed.tv_sec, elapsed.tv_nsec);
 
        fps_limit_timespecsub(&stats->time_end, &stats->time_start, &elapsed);
        fps_limit_dbg("Elapsed s: %ld ns: %ld", elapsed.tv_sec, elapsed.tv_nsec);
 

-       if (elapsed.tv_sec == 0 && elapsed.tv_nsec < NSEC_PER_SEC / stats->fps) {
+       if (elapsed.tv_sec == 0 && elapsed.tv_nsec < stats->delay) {

                struct timespec remaining = {0, 0};
 
                /* remaining delay, _relative_ to time_end */
                struct timespec remaining = {0, 0};
 
                /* remaining delay, _relative_ to time_end */

-               remaining.tv_nsec = (NSEC_PER_SEC / stats->fps) - elapsed.tv_nsec;
+               remaining.tv_nsec = stats->delay - elapsed.tv_nsec;

                fps_limit_dbg("Sleeping for: ns: %ld", remaining.tv_nsec);
 
                clock_nanosleep(CLOCK_MONOTONIC, 0, &remaining, NULL);
                fps_limit_dbg("Sleeping for: ns: %ld", remaining.tv_nsec);
 
                clock_nanosleep(CLOCK_MONOTONIC, 0, &remaining, NULL);