Video backend

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLVideoIOBridge.cpp

@@ -7,7 +7,7 @@
 #include <gl/gl.h>
 
 OpenGLVideoIOBridge::OpenGLVideoIOBridge(
-	VideoIODevice& videoIO,
+	VideoIODevice* videoIO,
 	OpenGLRenderer& renderer,
 	OpenGLRenderPipeline& renderPipeline,
 	RuntimeHost& runtimeHost,
@@ -24,6 +24,11 @@ OpenGLVideoIOBridge::OpenGLVideoIOBridge(
 {
 }
 
+void OpenGLVideoIOBridge::SetVideoIODevice(VideoIODevice* videoIO)
+{
+	mVideoIO = videoIO;
+}
+
 void OpenGLVideoIOBridge::RecordFramePacing(VideoIOCompletionResult completionResult)
 {
 	const auto now = std::chrono::steady_clock::now();
@@ -57,7 +62,10 @@ void OpenGLVideoIOBridge::RecordFramePacing(VideoIOCompletionResult completionRe
 
 void OpenGLVideoIOBridge::VideoFrameArrived(const VideoIOFrame& inputFrame)
 {
-	const VideoIOState& state = mVideoIO.State();
+	if (mVideoIO == nullptr)
+		return;
+
+	const VideoIOState& state = mVideoIO->State();
 	mRuntimeHost.TrySetSignalStatus(!inputFrame.hasNoInputSource, state.inputFrameSize.width, state.inputFrameSize.height, state.inputDisplayModeName);
 
 	if (inputFrame.hasNoInputSource || inputFrame.bytes == nullptr)
@@ -91,17 +99,20 @@ void OpenGLVideoIOBridge::VideoFrameArrived(const VideoIOFrame& inputFrame)
 
 void OpenGLVideoIOBridge::PlayoutFrameCompleted(const VideoIOCompletion& completion)
 {
+	if (mVideoIO == nullptr)
+		return;
+
 	RecordFramePacing(completion.result);
 
 	EnterCriticalSection(&mMutex);
 
 	VideoIOOutputFrame outputFrame;
-	if (!mVideoIO.BeginOutputFrame(outputFrame))
+	if (!mVideoIO->BeginOutputFrame(outputFrame))
 	{
 		LeaveCriticalSection(&mMutex);
 		return;
 	}
-	const VideoIOState& state = mVideoIO.State();
+	const VideoIOState& state = mVideoIO->State();
 	RenderPipelineFrameContext frameContext;
 	frameContext.videoState = state;
 	frameContext.completion = completion;
@@ -111,12 +122,12 @@ void OpenGLVideoIOBridge::PlayoutFrameCompleted(const VideoIOCompletion& complet
 
 	mRenderPipeline.RenderFrame(frameContext, outputFrame);
 
-	mVideoIO.EndOutputFrame(outputFrame);
+	mVideoIO->EndOutputFrame(outputFrame);
 
-	mVideoIO.AccountForCompletionResult(completion.result);
+	mVideoIO->AccountForCompletionResult(completion.result);
 
 	// Schedule the next frame for playout
-	mVideoIO.ScheduleOutputFrame(outputFrame);
+	mVideoIO->ScheduleOutputFrame(outputFrame);
 
 	wglMakeCurrent(NULL, NULL);
 

apps/LoopThroughWithOpenGLCompositing/gl/pipeline/OpenGLVideoIOBridge.h

@@ -13,7 +13,7 @@ class OpenGLVideoIOBridge
 {
 public:
 	OpenGLVideoIOBridge(
-		VideoIODevice& videoIO,
+		VideoIODevice* videoIO,
 		OpenGLRenderer& renderer,
 		OpenGLRenderPipeline& renderPipeline,
 		RuntimeHost& runtimeHost,
@@ -21,13 +21,15 @@ public:
 		HDC hdc,
 		HGLRC hglrc);
 
+	void SetVideoIODevice(VideoIODevice* videoIO);
+
 	void VideoFrameArrived(const VideoIOFrame& inputFrame);
 	void PlayoutFrameCompleted(const VideoIOCompletion& completion);
 
 private:
 	void RecordFramePacing(VideoIOCompletionResult completionResult);
 
-	VideoIODevice& mVideoIO;
+	VideoIODevice* mVideoIO;
 	OpenGLRenderer& mRenderer;
 	OpenGLRenderPipeline& mRenderPipeline;
 	RuntimeHost& mRuntimeHost;