Video backend

apps/LoopThroughWithOpenGLCompositing/gl/OpenGLComposite.cpp

@@ -1,5 +1,3 @@
-#include "DeckLinkDisplayMode.h"
-#include "DeckLinkSession.h"
 #include "OpenGLComposite.h"
 #include "GLExtensions.h"
 #include "GlRenderConstants.h"
@@ -10,6 +8,7 @@
 #include "PngScreenshotWriter.h"
 #include "RuntimeServices.h"
 #include "ShaderBuildQueue.h"
+#include "VideoIOBackendFactory.h"
 
 #include <algorithm>
 #include <chrono>
@@ -23,7 +22,6 @@
 
 OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
 	hGLWnd(hWnd), hGLDC(hDC), hGLRC(hRC),
-	mVideoIO(std::make_unique<DeckLinkSession>()),
 	mRenderer(std::make_unique<OpenGLRenderer>()),
 	mUseCommittedLayerStates(false),
 	mScreenshotRequested(false)
@@ -37,7 +35,7 @@ OpenGLComposite::OpenGLComposite(HWND hWnd, HDC hDC, HGLRC hRC) :
 		[this]() { ProcessScreenshotRequest(); },
 		[this]() { paintGL(); });
 	mVideoIOBridge = std::make_unique<OpenGLVideoIOBridge>(
-		*mVideoIO,
+		nullptr,
 		*mRenderer,
 		*mRenderPipeline,
 		*mRuntimeHost,
@@ -56,20 +54,15 @@ OpenGLComposite::~OpenGLComposite()
 		mRuntimeServices->Stop();
 	if (mShaderBuildQueue)
 		mShaderBuildQueue->Stop();
-	mVideoIO->ReleaseResources();
+	if (mVideoIO)
+		mVideoIO->ReleaseResources();
 	mRenderer->DestroyResources();
 
 	DeleteCriticalSection(&pMutex);
 }
 
-bool OpenGLComposite::InitDeckLink()
+bool OpenGLComposite::InitializeVideoIO()
 {
-	return InitVideoIO();
-}
-
-bool OpenGLComposite::InitVideoIO()
-{
-	VideoFormatSelection		videoModes;
 	std::string						initFailureReason;
 
 	if (mRuntimeHost && mRuntimeHost->GetRepoRoot().empty())
@@ -82,31 +75,31 @@ bool OpenGLComposite::InitVideoIO()
 		}
 	}
 
-	if (mRuntimeHost)
+	if (!mRuntimeHost)
 	{
-		if (!ResolveConfiguredVideoFormats(
-			mRuntimeHost->GetInputVideoFormat(),
-			mRuntimeHost->GetInputFrameRate(),
-			mRuntimeHost->GetOutputVideoFormat(),
-			mRuntimeHost->GetOutputFrameRate(),
-			videoModes,
-			initFailureReason))
-		{
-			MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink mode configuration error", MB_OK);
-			return false;
-		}
+		initFailureReason = "Runtime host is not available.";
+		MessageBoxA(NULL, initFailureReason.c_str(), "Video I/O initialization failed", MB_OK | MB_ICONERROR);
+		return false;
 	}
 
-	if (!mVideoIO->DiscoverDevicesAndModes(videoModes, initFailureReason))
+	const VideoIOConfiguration videoIOConfig = mRuntimeHost->GetVideoIOConfiguration();
+	mVideoIO = CreateVideoIODevice(videoIOConfig.backendId, initFailureReason);
+	if (!mVideoIO)
+	{
+		MessageBoxA(NULL, initFailureReason.c_str(), "Video I/O initialization failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+	mVideoIOBridge->SetVideoIODevice(mVideoIO.get());
+
+	if (!mVideoIO->DiscoverDevicesAndModes(videoIOConfig, initFailureReason))
 	{
 		const char* title = initFailureReason == "Please install the Blackmagic DeckLink drivers to use the features of this application."
-			? "This application requires the DeckLink drivers installed."
-			: "DeckLink initialization failed";
+			? "This application requires the selected video I/O drivers installed."
+			: "Video I/O initialization failed";
 		MessageBoxA(NULL, initFailureReason.c_str(), title, MB_OK | MB_ICONERROR);
 		return false;
 	}
-	const bool outputAlphaRequired = mRuntimeHost && mRuntimeHost->ExternalKeyingEnabled();
-	if (!mVideoIO->SelectPreferredFormats(videoModes, outputAlphaRequired, initFailureReason))
+	if (!mVideoIO->SelectPreferredFormats(videoIOConfig, initFailureReason))
 		goto error;
 
 	if (! CheckOpenGLExtensions())
@@ -121,9 +114,9 @@ bool OpenGLComposite::InitVideoIO()
 		goto error;
 	}
 
-	PublishVideoIOStatus(mVideoIO->OutputModelName().empty()
-		? "DeckLink output device selected."
-		: ("Selected output device: " + mVideoIO->OutputModelName()));
+	PublishVideoIOStatus(mVideoIO->DeviceName().empty()
+		? "Video I/O output device selected."
+		: ("Selected output device: " + mVideoIO->DeviceName()));
 
 	// Resize window to match output video frame, but scale large formats down by half for viewing.
 	if (mVideoIO->OutputFrameWidth() < 1920)
@@ -131,7 +124,7 @@ bool OpenGLComposite::InitVideoIO()
 	else
 		resizeWindow(mVideoIO->OutputFrameWidth() / 2, mVideoIO->OutputFrameHeight() / 2);
 
-	if (!mVideoIO->ConfigureInput([this](const VideoIOFrame& frame) { mVideoIOBridge->VideoFrameArrived(frame); }, videoModes.input, initFailureReason))
+	if (!mVideoIO->ConfigureInput([this](const VideoIOFrame& frame) { mVideoIOBridge->VideoFrameArrived(frame); }, initFailureReason))
 	{
 		goto error;
 	}
@@ -140,7 +133,7 @@ bool OpenGLComposite::InitVideoIO()
 		mRuntimeHost->SetSignalStatus(false, mVideoIO->InputFrameWidth(), mVideoIO->InputFrameHeight(), mVideoIO->InputDisplayModeName());
 	}
 
-	if (!mVideoIO->ConfigureOutput([this](const VideoIOCompletion& completion) { mVideoIOBridge->PlayoutFrameCompleted(completion); }, videoModes.output, mRuntimeHost && mRuntimeHost->ExternalKeyingEnabled(), initFailureReason))
+	if (!mVideoIO->ConfigureOutput([this](const VideoIOCompletion& completion) { mVideoIOBridge->PlayoutFrameCompleted(completion); }, initFailureReason))
 	{
 		goto error;
 	}
@@ -151,13 +144,16 @@ bool OpenGLComposite::InitVideoIO()
 
 error:
 	if (!initFailureReason.empty())
-		MessageBoxA(NULL, initFailureReason.c_str(), "DeckLink initialization failed", MB_OK | MB_ICONERROR);
+		MessageBoxA(NULL, initFailureReason.c_str(), "Video I/O initialization failed", MB_OK | MB_ICONERROR);
 	mVideoIO->ReleaseResources();
 	return false;
 }
 
 void OpenGLComposite::paintGL()
 {
+	if (!mVideoIO)
+		return;
+
 	if (!TryEnterCriticalSection(&pMutex))
 	{
 		ValidateRect(hGLWnd, NULL);
@@ -187,21 +183,13 @@ void OpenGLComposite::resizeWindow(int width, int height)
 
 void OpenGLComposite::PublishVideoIOStatus(const std::string& statusMessage)
 {
-	if (!mRuntimeHost)
+	if (!mRuntimeHost || !mVideoIO)
 		return;
 
 	if (!statusMessage.empty())
 		mVideoIO->SetStatusMessage(statusMessage);
 
-	mRuntimeHost->SetVideoIOStatus(
-		"decklink",
-		mVideoIO->OutputModelName(),
-		mVideoIO->SupportsInternalKeying(),
-		mVideoIO->SupportsExternalKeying(),
-		mVideoIO->KeyerInterfaceAvailable(),
-		mRuntimeHost->ExternalKeyingEnabled(),
-		mVideoIO->ExternalKeyingActive(),
-		mVideoIO->StatusMessage());
+	mRuntimeHost->SetVideoIOStatus(mVideoIO->State());
 }
 
 bool OpenGLComposite::InitOpenGLState()