From 2f1e37bb7cad2284f52dcef1377e9eebbabc35d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <zhangsongcui3371@sina.com>
Date: Mon, 12 Jan 2026 14:29:49 +0800
Subject: [PATCH] Common (Windows): improves performance of `ffTimeGetTick`

---
 src/common/impl/time.c |  4 ++++
 src/common/time.h      | 11 ++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/common/impl/time.c b/src/common/impl/time.c
index b49dd0aee..40bd9b6ff 100644
--- a/src/common/impl/time.c
+++ b/src/common/impl/time.c
@@ -81,3 +81,7 @@ FFTimeGetAgeResult ffTimeGetAge(uint64_t birthMs, uint64_t nowMs)
 
     return result;
 }
+
+#ifdef _WIN32
+    double ffQpcMultiplier;
+#endif
diff --git a/src/common/time.h b/src/common/time.h
index cdb345d3c..867980f12 100644
--- a/src/common/time.h
+++ b/src/common/time.h
@@ -15,11 +15,16 @@
 static inline double ffTimeGetTick(void) //In msec
 {
     #ifdef _WIN32
-        LARGE_INTEGER frequency;
-        QueryPerformanceFrequency(&frequency);
+        extern double ffQpcMultiplier;
+        if (ffQpcMultiplier == 0)
+        {
+            LARGE_INTEGER frequency;
+            QueryPerformanceFrequency(&frequency);
+            ffQpcMultiplier = 1000. / (double) frequency.QuadPart;
+        }
         LARGE_INTEGER start;
         QueryPerformanceCounter(&start);
-        return (double) start.QuadPart * 1000 / (double) frequency.QuadPart;
+        return (double) start.QuadPart * ffQpcMultiplier;
     #elif defined(__HAIKU__)
         return (double) system_time() / 1000.;
     #else