stutter fix

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLDeckLinkBridge.h

@@ -4,7 +4,9 @@
 
 #include <windows.h>
 
+#include <chrono>
 #include <functional>
+#include <cstdint>
 
 class DeckLinkSession;
 class OpenGLRenderer;
@@ -30,6 +32,8 @@ public:
 	void PlayoutFrameCompleted(IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completionResult);
 
 private:
+	void RecordFramePacing(BMDOutputFrameCompletionResult completionResult);
+
 	DeckLinkSession& mDeckLink;
 	OpenGLRenderer& mRenderer;
 	RuntimeHost& mRuntimeHost;
@@ -38,4 +42,11 @@ private:
 	HGLRC mHglrc;
 	RenderEffectCallback mRenderEffect;
 	PaintCallback mPaint;
+	std::chrono::steady_clock::time_point mLastPlayoutCompletionTime;
+	double mCompletionIntervalMilliseconds = 0.0;
+	double mSmoothedCompletionIntervalMilliseconds = 0.0;
+	double mMaxCompletionIntervalMilliseconds = 0.0;
+	uint64_t mLateFrameCount = 0;
+	uint64_t mDroppedFrameCount = 0;
+	uint64_t mFlushedFrameCount = 0;
 };