1 files changed, 69 insertions, 0 deletions
diff --git a/src/common/timing.c b/src/common/timing.c
new file mode 100644
index 0000000..b5e342f
--- /dev/null
+++ b/src/common/timing.c
@@ -0,0 +1,69 @@
+#include "yasl/timing.h"
+
+uint64_t yasl_clock_extend_ms(uint32_t ms, uint64_t now_ns)
+{
+    uint64_t now_ms = now_ns / 1000000;
+    int64_t ahead = (int32_t)(ms - (uint32_t)now_ms);
+    if (ahead < 0 && (uint64_t)-ahead > now_ms)
+        return (uint64_t)ms * 1000000;
+    return (now_ms + (uint64_t)ahead) * 1000000;
+}
+
+void yasl_clock_presented(struct yasl_frame_clock *c, uint64_t now, bool sample)
+{
+    if (c->last_present_ns) {
+        double dt = (double)(now - c->last_present_ns);
+        if (sample && dt < 250e6)
+            c->refresh_ns += 0.125 * (dt - c->refresh_ns);
+    }
+    c->last_present_ns = now;
+}
+
+void yasl_clock_note_resize(struct yasl_frame_clock *c, uint64_t dt_ns)
+{
+    c->resize_count++;
+    c->resize_sum_ns += dt_ns;
+    if (dt_ns > c->resize_max_ns)
+        c->resize_max_ns = dt_ns;
+}
+
+void yasl_clock_resize_stats(const struct yasl_frame_clock *c,
+                             struct yasl_resize_stats *out)
+{
+    out->count = c->resize_count;
+    out->avg_us = c->resize_count
+            ? (double)c->resize_sum_ns / 1e3 / (double)c->resize_count
+            : 0.0;
+    out->max_us = (double)c->resize_max_ns / 1e3;
+    out->minflt = c->resize_minflt;
+}
+
+double yasl_clock_refresh_ms(const struct yasl_frame_clock *c)
+{
+    return c->refresh_ns / 1e6;
+}
+
+uint64_t yasl_clock_next_present_ns(const struct yasl_frame_clock *c)
+{
+    return c->last_present_ns
+            ? c->last_present_ns + (uint64_t)c->refresh_ns
+            : 0;
+}
+
+uint64_t yasl_clock_frame_timestamp_ns(struct yasl_frame_clock *c, uint64_t now)
+{
+    if (!c->last_present_ns || c->refresh_ns <= 0.0) {
+        c->frame_time_ns = now;
+        return now;
+    }
+    double k = ((double)now - (double)c->last_present_ns) / c->refresh_ns + 0.5;
+    uint64_t grid = c->last_present_ns +
+        (uint64_t)((uint64_t)(k > 0.0 ? k : 0.0) * c->refresh_ns);
+    if (!c->frame_time_ns) {
+        c->frame_time_ns = grid;
+        return grid;
+    }
+    uint64_t t = grid > c->frame_time_ns ? grid : c->frame_time_ns;
+    c->frame_time_ns = t;
+    return t;
+}