INput

apps/RenderCadenceCompositor/frames/InputFrameMailbox.h

@@ -0,0 +1,87 @@
+#pragma once
+
+#include "VideoIOFormat.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+enum class InputFrameSlotState
+{
+	Free,
+	Ready,
+	Reading
+};
+
+struct InputFrameMailboxConfig
+{
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Bgra8;
+	unsigned rowBytes = 0;
+	std::size_t capacity = 0;
+};
+
+struct InputFrame
+{
+	const void* bytes = nullptr;
+	long rowBytes = 0;
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Bgra8;
+	std::size_t index = 0;
+	uint64_t generation = 0;
+	uint64_t frameIndex = 0;
+};
+
+struct InputFrameMailboxMetrics
+{
+	std::size_t capacity = 0;
+	std::size_t freeCount = 0;
+	std::size_t readyCount = 0;
+	std::size_t readingCount = 0;
+	uint64_t submittedFrames = 0;
+	uint64_t consumedFrames = 0;
+	uint64_t droppedReadyFrames = 0;
+	uint64_t submitMisses = 0;
+	uint64_t consumeMisses = 0;
+	uint64_t latestFrameIndex = 0;
+};
+
+class InputFrameMailbox
+{
+public:
+	InputFrameMailbox() = default;
+	explicit InputFrameMailbox(const InputFrameMailboxConfig& config);
+
+	void Configure(const InputFrameMailboxConfig& config);
+	InputFrameMailboxConfig Config() const;
+
+	bool SubmitFrame(const void* bytes, unsigned rowBytes, uint64_t frameIndex);
+	bool TryAcquireLatest(InputFrame& frame);
+	bool Release(const InputFrame& frame);
+	void Clear();
+	InputFrameMailboxMetrics Metrics() const;
+
+private:
+	struct Slot
+	{
+		std::vector<unsigned char> bytes;
+		InputFrameSlotState state = InputFrameSlotState::Free;
+		uint64_t frameIndex = 0;
+		uint64_t generation = 0;
+	};
+
+	bool IsValidLocked(const InputFrame& frame) const;
+	void FillFrameLocked(std::size_t index, InputFrame& frame) const;
+	bool DropOldestReadyLocked();
+	std::size_t FrameByteCount() const;
+
+	mutable std::mutex mMutex;
+	InputFrameMailboxConfig mConfig;
+	std::vector<Slot> mSlots;
+	std::deque<std::size_t> mReadyIndices;
+	InputFrameMailboxMetrics mCounters;
+};