From 1699d1498489d2494e11cb3c78872241c660b462 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <zhangsongcui3371@sina.com>
Date: Wed, 14 Jan 2026 10:03:51 +0800
Subject: [PATCH] Common: ensures thread safety of `ffTimeInitQpcMultiplier`

---
 src/common/impl/time.c | 8 ++++++++
 src/common/time.h      | 6 ------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/common/impl/time.c b/src/common/impl/time.c
index 40bd9b6ff..2927f9784 100644
--- a/src/common/impl/time.c
+++ b/src/common/impl/time.c
@@ -84,4 +84,12 @@ FFTimeGetAgeResult ffTimeGetAge(uint64_t birthMs, uint64_t nowMs)
 
 #ifdef _WIN32
     double ffQpcMultiplier;
+
+    __attribute__((constructor))
+    static void ffTimeInitQpcMultiplier(void)
+    {
+        LARGE_INTEGER frequency;
+        QueryPerformanceFrequency(&frequency);
+        ffQpcMultiplier = 1000. / (double) frequency.QuadPart;
+    }
 #endif
diff --git a/src/common/time.h b/src/common/time.h
index de32bb843..d8506d3b8 100644
--- a/src/common/time.h
+++ b/src/common/time.h
@@ -25,12 +25,6 @@ static inline double ffTimeGetTick(void) //In msec
 {
     #ifdef _WIN32
         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 * ffQpcMultiplier;