Phase 7 step 2

apps/LoopThroughWithOpenGLCompositing/videoio/VideoPlayoutPolicy.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <cstdint>
+
+enum class VideoUnderrunBehavior
+{
+	ReuseLastCompletedFrame,
+	BlackFrame
+};
+
+struct VideoPlayoutPolicy
+{
+	unsigned outputFramePoolSize = 10;
+	unsigned targetPrerollFrames = 12;
+	unsigned targetReadyFrames = 2;
+	unsigned maxReadyFrames = 4;
+	unsigned minimumSpareDeviceFrames = 1;
+	uint64_t lateOrDropCatchUpFrames = 2;
+	VideoUnderrunBehavior underrunBehavior = VideoUnderrunBehavior::ReuseLastCompletedFrame;
+	bool adaptiveHeadroomEnabled = false;
+};
+
+inline VideoPlayoutPolicy NormalizeVideoPlayoutPolicy(VideoPlayoutPolicy policy)
+{
+	if (policy.outputFramePoolSize == 0)
+		policy.outputFramePoolSize = 1;
+	if (policy.targetPrerollFrames == 0)
+		policy.targetPrerollFrames = 1;
+	if (policy.targetReadyFrames == 0)
+		policy.targetReadyFrames = 1;
+	if (policy.maxReadyFrames < policy.targetReadyFrames)
+		policy.maxReadyFrames = policy.targetReadyFrames;
+	return policy;
+}