V2 working

apps/RenderCadenceCompositor/app/RenderCadenceApp.h

@@ -0,0 +1,148 @@
+#pragma once
+
+#include "AppConfig.h"
+#include "../telemetry/TelemetryPrinter.h"
+#include "../video/DeckLinkOutput.h"
+#include "../video/DeckLinkOutputThread.h"
+
+#include <chrono>
+#include <string>
+#include <thread>
+#include <type_traits>
+
+namespace RenderCadenceCompositor
+{
+namespace detail
+{
+template <typename RenderThread>
+auto StartRenderThread(RenderThread& renderThread, std::string& error, int) -> decltype(renderThread.Start(error), bool())
+{
+	return renderThread.Start(error);
+}
+
+template <typename RenderThread>
+bool StartRenderThreadWithoutError(RenderThread& renderThread, std::true_type)
+{
+	return renderThread.Start();
+}
+
+template <typename RenderThread>
+bool StartRenderThreadWithoutError(RenderThread& renderThread, std::false_type)
+{
+	renderThread.Start();
+	return true;
+}
+
+template <typename RenderThread>
+auto StartRenderThread(RenderThread& renderThread, std::string&, long) -> decltype(renderThread.Start(), bool())
+{
+	return StartRenderThreadWithoutError(renderThread, std::is_same<decltype(renderThread.Start()), bool>());
+}
+}
+
+template <typename RenderThread, typename SystemFrameExchange>
+class RenderCadenceApp
+{
+public:
+	RenderCadenceApp(RenderThread& renderThread, SystemFrameExchange& frameExchange, AppConfig config = DefaultAppConfig()) :
+		mRenderThread(renderThread),
+		mFrameExchange(frameExchange),
+		mConfig(config),
+		mOutputThread(mOutput, mFrameExchange, mConfig.outputThread),
+		mTelemetry(mConfig.telemetry)
+	{
+	}
+
+	RenderCadenceApp(const RenderCadenceApp&) = delete;
+	RenderCadenceApp& operator=(const RenderCadenceApp&) = delete;
+
+	~RenderCadenceApp()
+	{
+		Stop();
+	}
+
+	bool Start(std::string& error)
+	{
+		if (!mOutput.Initialize(
+			mConfig.deckLink,
+			[this](const VideoIOCompletion& completion) {
+				mFrameExchange.ReleaseScheduledByBytes(completion.outputFrameBuffer);
+			},
+			error))
+		{
+			return false;
+		}
+
+		if (!detail::StartRenderThread(mRenderThread, error, 0))
+		{
+			Stop();
+			return false;
+		}
+
+		if (!mFrameExchange.WaitForCompletedDepth(mConfig.warmupCompletedFrames, mConfig.warmupTimeout))
+		{
+			error = "Timed out waiting for rendered warmup frames.";
+			Stop();
+			return false;
+		}
+
+		if (!mOutputThread.Start())
+		{
+			error = "DeckLink output thread failed to start.";
+			Stop();
+			return false;
+		}
+
+		if (!WaitForPreroll())
+		{
+			error = "Timed out waiting for DeckLink preroll frames.";
+			Stop();
+			return false;
+		}
+
+		if (!mOutput.StartScheduledPlayback(error))
+		{
+			Stop();
+			return false;
+		}
+
+		mTelemetry.Start(mFrameExchange, mOutput, mOutputThread);
+		mStarted = true;
+		return true;
+	}
+
+	void Stop()
+	{
+		mTelemetry.Stop();
+		mOutputThread.Stop();
+		mOutput.Stop();
+		mRenderThread.Stop();
+		mOutput.ReleaseResources();
+		mStarted = false;
+	}
+
+	bool Started() const { return mStarted; }
+	const DeckLinkOutput& Output() const { return mOutput; }
+
+private:
+	bool WaitForPreroll() const
+	{
+		const auto deadline = std::chrono::steady_clock::now() + mConfig.prerollTimeout;
+		while (std::chrono::steady_clock::now() < deadline)
+		{
+			if (mFrameExchange.Metrics().scheduledCount >= mConfig.outputThread.targetBufferedFrames)
+				return true;
+			std::this_thread::sleep_for(mConfig.prerollPoll);
+		}
+		return false;
+	}
+
+	RenderThread& mRenderThread;
+	SystemFrameExchange& mFrameExchange;
+	AppConfig mConfig;
+	DeckLinkOutput mOutput;
+	DeckLinkOutputThread<SystemFrameExchange> mOutputThread;
+	TelemetryPrinter mTelemetry;
+	bool mStarted = false;
+};
+}