From 16e9a63eb6628b01bf0f71297c1643c46ad80c9e Mon Sep 17 00:00:00 2001
From: wiiiii123 <hong95402@st.vimaru.edu.vn>
Date: Sun, 19 Apr 2026 20:20:06 +0700
Subject: [PATCH] fix(windows): normalize WGC sample timestamps

---
 electron/native/wgc-capture/src/main.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/electron/native/wgc-capture/src/main.cpp b/electron/native/wgc-capture/src/main.cpp
index c949e8a2..ae0a50a0 100644
--- a/electron/native/wgc-capture/src/main.cpp
+++ b/electron/native/wgc-capture/src/main.cpp
@@ -19,6 +19,7 @@ static std::atomic<bool> g_stopRequested{false};
 static std::atomic<bool> g_pauseRequested{false};
 static std::atomic<bool> g_resumePending{false};
 static std::atomic<int64_t> g_lastFrameTimestampHns{0};
+static std::atomic<int64_t> g_firstFrameTimestampHns{-1};
 static std::atomic<int64_t> g_pauseStartTimestampHns{0};
 static std::atomic<int64_t> g_accumulatedPausedHns{0};
 static std::mutex g_stopMutex;
@@ -257,6 +258,16 @@ int main(int argc, char* argv[]) {
 
         if (g_pauseRequested) return;
 
+        int64_t firstFrameTimestampHns = g_firstFrameTimestampHns.load();
+        if (firstFrameTimestampHns < 0) {
+            int64_t expected = -1;
+            if (g_firstFrameTimestampHns.compare_exchange_strong(expected, timestampHns)) {
+                firstFrameTimestampHns = timestampHns;
+            } else {
+                firstFrameTimestampHns = g_firstFrameTimestampHns.load();
+            }
+        }
+
         int64_t adjustedTimestampHns = timestampHns;
         if (g_resumePending.exchange(false)) {
             const int64_t pauseStart = g_pauseStartTimestampHns.load();
@@ -265,6 +276,7 @@ int main(int argc, char* argv[]) {
             }
         }
 
+        adjustedTimestampHns -= firstFrameTimestampHns;
         adjustedTimestampHns -= g_accumulatedPausedHns.load();
         if (adjustedTimestampHns < 0) {
             adjustedTimestampHns = 0;