Folder fixes

.vscode/launch.json

@@ -1,89 +1,6 @@
 {
   "version": "0.2.0",
   "configurations": [
-    {
-      "name": "Debug LoopThroughWithOpenGLCompositing",
-      "type": "cppvsdbg",
-      "request": "launch",
-      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\LoopThroughWithOpenGLCompositing.exe",
-      "args": [],
-      "stopAtEntry": false,
-      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "environment": [
-        {
-          "name": "VST_DISABLE_INPUT_CAPTURE",
-          "value": "1"
-        }
-      ],
-      "console": "internalConsole",
-      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "requireExactSource": true,
-      "logging": {
-        "moduleLoad": true
-      },
-      "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
-    },
-    {
-      "name": "Debug LoopThroughWithOpenGLCompositing - sync readback experiment",
-      "type": "cppvsdbg",
-      "request": "launch",
-      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\LoopThroughWithOpenGLCompositing.exe",
-      "args": [],
-      "stopAtEntry": false,
-      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "environment": [
-        {
-          "name": "VST_OUTPUT_READBACK_MODE",
-          "value": "sync"
-        }
-      ],
-      "console": "internalConsole",
-      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "requireExactSource": true,
-      "logging": {
-        "moduleLoad": true
-      },
-      "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
-    },
-    {
-      "name": "Debug LoopThroughWithOpenGLCompositing - cached output experiment",
-      "type": "cppvsdbg",
-      "request": "launch",
-      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\LoopThroughWithOpenGLCompositing.exe",
-      "args": [],
-      "stopAtEntry": false,
-      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "environment": [
-        {
-          "name": "VST_OUTPUT_READBACK_MODE",
-          "value": "cached_only"
-        }
-      ],
-      "console": "internalConsole",
-      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "requireExactSource": true,
-      "logging": {
-        "moduleLoad": true
-      },
-      "preLaunchTask": "Build LoopThroughWithOpenGLCompositing Debug x64"
-    },
-    {
-      "name": "Debug DeckLinkRenderCadenceProbe",
-      "type": "cppvsdbg",
-      "request": "launch",
-      "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\DeckLinkRenderCadenceProbe.exe",
-      "args": [],
-      "stopAtEntry": false,
-      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "environment": [],
-      "console": "externalTerminal",
-      "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
-      "requireExactSource": true,
-      "logging": {
-        "moduleLoad": true
-      },
-      "preLaunchTask": "Build DeckLinkRenderCadenceProbe Debug x64"
-    },
     {
       "name": "Debug RenderCadenceCompositor",
       "type": "cppvsdbg",
@@ -91,7 +8,7 @@
       "program": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug\\RenderCadenceCompositor.exe",
       "args": [],
       "stopAtEntry": false,
-      "cwd": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",
+      "cwd": "${workspaceFolder}",
       "environment": [],
       "console": "externalTerminal",
       "symbolSearchPath": "${workspaceFolder}\\build\\vs2022-x64-debug\\Debug",

.vscode/tasks.json

@@ -2,60 +2,19 @@
   "version": "2.0.0",
   "tasks": [
     {
-      "label": "Build LoopThroughWithOpenGLCompositing Debug x64",
+      "label": "Configure Debug x64",
       "type": "process",
-      "command": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\CMake\\CMake\\bin\\cmake.exe",
+      "command": "cmake",
       "args": [
-        "--build",
-        "${workspaceFolder}\\build\\vs2022-x64-debug",
-        "--config",
-        "Debug",
-        "--target",
-        "LoopThroughWithOpenGLCompositing",
-        "--parallel"
+        "--preset",
+        "vs2022-x64-debug"
       ],
-      "group": {
-        "kind": "build",
-        "isDefault": true
-      },
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "Build LoopThroughWithOpenGLCompositing Release x64",
-      "type": "process",
-      "command": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\CMake\\CMake\\bin\\cmake.exe",
-      "args": [
-        "--build",
-        "${workspaceFolder}\\build\\vs2022-x64-release",
-        "--config",
-        "Release",
-        "--target",
-        "LoopThroughWithOpenGLCompositing",
-        "--parallel"
-      ],
-      "group": "build",
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "Build DeckLinkRenderCadenceProbe Debug x64",
-      "type": "process",
-      "command": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\CMake\\CMake\\bin\\cmake.exe",
-      "args": [
-        "--build",
-        "${workspaceFolder}\\build\\vs2022-x64-debug",
-        "--config",
-        "Debug",
-        "--target",
-        "DeckLinkRenderCadenceProbe",
-        "--parallel"
-      ],
-      "group": "build",
       "problemMatcher": "$msCompile"
     },
     {
       "label": "Build RenderCadenceCompositor Debug x64",
       "type": "process",
-      "command": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\CMake\\CMake\\bin\\cmake.exe",
+      "command": "cmake",
       "args": [
         "--build",
         "${workspaceFolder}\\build\\vs2022-x64-debug",
@@ -65,13 +24,50 @@
         "RenderCadenceCompositor",
         "--parallel"
       ],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "dependsOn": "Configure Debug x64",
+      "problemMatcher": "$msCompile"
+    },
+    {
+      "label": "Build RenderCadenceCompositor Release x64",
+      "type": "process",
+      "command": "cmake",
+      "args": [
+        "--build",
+        "${workspaceFolder}\\build\\vs2022-x64-release",
+        "--config",
+        "Release",
+        "--target",
+        "RenderCadenceCompositor",
+        "--parallel"
+      ],
       "group": "build",
       "problemMatcher": "$msCompile"
     },
     {
-      "label": "Clean LoopThroughWithOpenGLCompositing Debug x64",
+      "label": "Run Native Tests Debug x64",
       "type": "process",
-      "command": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\Common7\\IDE\\CommonExtensions\\Microsoft\\CMake\\CMake\\bin\\cmake.exe",
+      "command": "cmake",
+      "args": [
+        "--build",
+        "${workspaceFolder}\\build\\vs2022-x64-debug",
+        "--config",
+        "Debug",
+        "--target",
+        "RUN_TESTS",
+        "--parallel"
+      ],
+      "group": "test",
+      "dependsOn": "Configure Debug x64",
+      "problemMatcher": "$msCompile"
+    },
+    {
+      "label": "Clean Debug x64",
+      "type": "process",
+      "command": "cmake",
       "args": [
         "--build",
         "${workspaceFolder}\\build\\vs2022-x64-debug",

src/platform/NativeHandles.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <windows.h>
+
+class UniqueHandle
+{
+public:
+	explicit UniqueHandle(HANDLE handle = NULL) : mHandle(handle) {}
+	~UniqueHandle() { reset(); }
+
+	UniqueHandle(const UniqueHandle&) = delete;
+	UniqueHandle& operator=(const UniqueHandle&) = delete;
+
+	UniqueHandle(UniqueHandle&& other) noexcept : mHandle(other.release()) {}
+
+	UniqueHandle& operator=(UniqueHandle&& other) noexcept
+	{
+		if (this != &other)
+			reset(other.release());
+		return *this;
+	}
+
+	HANDLE get() const { return mHandle; }
+	bool valid() const { return mHandle != NULL && mHandle != INVALID_HANDLE_VALUE; }
+
+	HANDLE release()
+	{
+		HANDLE handle = mHandle;
+		mHandle = NULL;
+		return handle;
+	}
+
+	void reset(HANDLE handle = NULL)
+	{
+		if (valid())
+			CloseHandle(mHandle);
+		mHandle = handle;
+	}
+
+private:
+	HANDLE mHandle;
+};

src/platform/NativeSockets.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <winsock2.h>
+
+class UniqueSocket
+{
+public:
+	explicit UniqueSocket(SOCKET socket = INVALID_SOCKET) : mSocket(socket) {}
+	~UniqueSocket() { reset(); }
+
+	UniqueSocket(const UniqueSocket&) = delete;
+	UniqueSocket& operator=(const UniqueSocket&) = delete;
+
+	UniqueSocket(UniqueSocket&& other) noexcept : mSocket(other.release()) {}
+
+	UniqueSocket& operator=(UniqueSocket&& other) noexcept
+	{
+		if (this != &other)
+			reset(other.release());
+		return *this;
+	}
+
+	SOCKET get() const { return mSocket; }
+	bool valid() const { return mSocket != INVALID_SOCKET; }
+
+	SOCKET release()
+	{
+		SOCKET socket = mSocket;
+		mSocket = INVALID_SOCKET;
+		return socket;
+	}
+
+	void reset(SOCKET socket = INVALID_SOCKET)
+	{
+		if (valid())
+			closesocket(mSocket);
+		mSocket = socket;
+	}
+
+private:
+	SOCKET mSocket;
+};

src/render/GLExtensions.cpp

@@ -0,0 +1,212 @@
+/* -LICENSE-START-
+ ** Copyright (c) 2012 Blackmagic Design
+ **  
+ ** Permission is hereby granted, free of charge, to any person or organization 
+ ** obtaining a copy of the software and accompanying documentation (the 
+ ** "Software") to use, reproduce, display, distribute, sub-license, execute, 
+ ** and transmit the Software, and to prepare derivative works of the Software, 
+ ** and to permit third-parties to whom the Software is furnished to do so, in 
+ ** accordance with:
+ ** 
+ ** (1) if the Software is obtained from Blackmagic Design, the End User License 
+ ** Agreement for the Software Development Kit ("EULA") available at 
+ ** https://www.blackmagicdesign.com/EULA/DeckLinkSDK; or
+ ** 
+ ** (2) if the Software is obtained from any third party, such licensing terms 
+ ** as notified by that third party,
+ ** 
+ ** and all subject to the following:
+ ** 
+ ** (3) the copyright notices in the Software and this entire statement, 
+ ** including the above license grant, this restriction and the following 
+ ** disclaimer, must be included in all copies of the Software, in whole or in 
+ ** part, and all derivative works of the Software, unless such copies or 
+ ** derivative works are solely in the form of machine-executable object code 
+ ** generated by a source language processor.
+ ** 
+ ** (4) THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+ ** OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ ** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 
+ ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 
+ ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 
+ ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ ** DEALINGS IN THE SOFTWARE.
+ ** 
+ ** A copy of the Software is available free of charge at 
+ ** https://www.blackmagicdesign.com/desktopvideo_sdk under the EULA.
+ ** 
+ ** -LICENSE-END-
+ */
+//
+//  GLExtensions.cpp
+//  LoopThroughWithOpenGLCompositing
+//
+
+#include "GLExtensions.h"
+
+PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers;
+PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers;
+PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer;
+PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage;
+PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers;
+PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers;
+PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer;
+PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D;
+PFNGLFRAMEBUFFERRENDERBUFFERPROC glFramebufferRenderbuffer;
+PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus;
+PFNGLBLITFRAMEBUFFERPROC glBlitFramebuffer;
+PFNGLFENCESYNCPROC glFenceSync;
+PFNGLCLIENTWAITSYNCPROC glClientWaitSync;
+PFNGLDELETESYNCPROC glDeleteSync;
+PFNGLGENBUFFERSPROC glGenBuffers;
+PFNGLDELETEBUFFERSPROC glDeleteBuffers;
+PFNGLBINDBUFFERPROC glBindBuffer;
+PFNGLBUFFERDATAPROC glBufferData;
+PFNGLMAPBUFFERPROC glMapBuffer;
+PFNGLUNMAPBUFFERPROC glUnmapBuffer;
+PFNGLBUFFERSUBDATAPROC glBufferSubData;
+PFNGLBINDBUFFERBASEPROC glBindBufferBase;
+PFNGLACTIVETEXTUREPROC glActiveTexture;
+PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
+PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;
+PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
+PFNGLCREATESHADERPROC glCreateShader;
+PFNGLDELETESHADERPROC glDeleteShader;
+PFNGLDELETEPROGRAMPROC glDeleteProgram;
+PFNGLSHADERSOURCEPROC glShaderSource;
+PFNGLCOMPILESHADERPROC glCompileShader;
+PFNGLGETSHADERIVPROC glGetShaderiv;
+PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
+PFNGLCREATEPROGRAMPROC glCreateProgram;
+PFNGLATTACHSHADERPROC glAttachShader;
+PFNGLLINKPROGRAMPROC glLinkProgram;
+PFNGLGETPROGRAMIVPROC glGetProgramiv;
+PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
+PFNGLUSEPROGRAMPROC glUseProgram;
+PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
+PFNGLGETUNIFORMBLOCKINDEXPROC glGetUniformBlockIndex;
+PFNGLUNIFORMBLOCKBINDINGPROC glUniformBlockBinding;
+PFNGLUNIFORM1IPROC glUniform1i;
+PFNGLUNIFORM1FPROC glUniform1f;
+PFNGLUNIFORM2FPROC glUniform2f;
+PFNGLUNIFORM4FPROC glUniform4f;
+
+bool ResolveGLExtensions()
+{
+	glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC) wglGetProcAddress("glGenFramebuffers");
+	if (!glGenFramebuffers)
+		glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC) wglGetProcAddress("glGenFramebuffersEXT");
+	glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC) wglGetProcAddress("glGenRenderbuffers");
+	if (!glGenRenderbuffers)
+		glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC) wglGetProcAddress("glGenRenderbuffersEXT");
+	glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC) wglGetProcAddress("glBindRenderbuffer");
+	if (!glBindRenderbuffer)
+		glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC) wglGetProcAddress("glBindRenderbufferEXT");
+	glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC) wglGetProcAddress("glRenderbufferStorage");
+	if (!glRenderbufferStorage)
+		glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC) wglGetProcAddress("glRenderbufferStorageEXT");
+	glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC) wglGetProcAddress("glDeleteFramebuffers");
+	if (!glDeleteFramebuffers)
+		glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC) wglGetProcAddress("glDeleteFramebuffersEXT");
+	glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC) wglGetProcAddress("glDeleteRenderbuffers");
+	if (!glDeleteRenderbuffers)
+		glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC) wglGetProcAddress("glDeleteRenderbuffersEXT");
+	glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC) wglGetProcAddress("glBindFramebuffer");
+	if (!glBindFramebuffer)
+		glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC) wglGetProcAddress("glBindFramebufferEXT");
+	glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC) wglGetProcAddress("glFramebufferTexture2D");
+	if (!glFramebufferTexture2D)
+		glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC) wglGetProcAddress("glFramebufferTexture2DEXT");
+	glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC) wglGetProcAddress("glFramebufferRenderbuffer");
+	if (!glFramebufferRenderbuffer)
+		glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC) wglGetProcAddress("glFramebufferRenderbufferEXT");
+	glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC) wglGetProcAddress("glCheckFramebufferStatus");
+	if (!glCheckFramebufferStatus)
+		glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC) wglGetProcAddress("glCheckFramebufferStatusEXT");
+	glBlitFramebuffer = (PFNGLBLITFRAMEBUFFERPROC) wglGetProcAddress("glBlitFramebuffer");
+	if (!glBlitFramebuffer)
+		glBlitFramebuffer = (PFNGLBLITFRAMEBUFFERPROC) wglGetProcAddress("glBlitFramebufferEXT");
+	glFenceSync = (PFNGLFENCESYNCPROC) wglGetProcAddress("glFenceSync");
+	glClientWaitSync = (PFNGLCLIENTWAITSYNCPROC) wglGetProcAddress("glClientWaitSync");
+	glDeleteSync = (PFNGLDELETESYNCPROC) wglGetProcAddress("glDeleteSync");
+	glGenBuffers = (PFNGLGENBUFFERSPROC) wglGetProcAddress("glGenBuffers");
+	glDeleteBuffers = (PFNGLDELETEBUFFERSPROC) wglGetProcAddress("glDeleteBuffers");
+	glBindBuffer = (PFNGLBINDBUFFERPROC) wglGetProcAddress("glBindBuffer");
+	glBufferData = (PFNGLBUFFERDATAPROC) wglGetProcAddress("glBufferData");
+	glMapBuffer = (PFNGLMAPBUFFERPROC) wglGetProcAddress("glMapBuffer");
+	glUnmapBuffer = (PFNGLUNMAPBUFFERPROC) wglGetProcAddress("glUnmapBuffer");
+	glBufferSubData = (PFNGLBUFFERSUBDATAPROC) wglGetProcAddress("glBufferSubData");
+	glBindBufferBase = (PFNGLBINDBUFFERBASEPROC) wglGetProcAddress("glBindBufferBase");
+	glActiveTexture = (PFNGLACTIVETEXTUREPROC) wglGetProcAddress("glActiveTexture");
+	glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC) wglGetProcAddress("glGenVertexArrays");
+	glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSPROC) wglGetProcAddress("glDeleteVertexArrays");
+	glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC) wglGetProcAddress("glBindVertexArray");
+	glCreateShader = (PFNGLCREATESHADERPROC) wglGetProcAddress("glCreateShader");
+	glDeleteShader = (PFNGLDELETESHADERPROC) wglGetProcAddress("glDeleteShader");
+	glDeleteProgram = (PFNGLDELETEPROGRAMPROC) wglGetProcAddress("glDeleteProgram");
+	glShaderSource = (PFNGLSHADERSOURCEPROC) wglGetProcAddress("glShaderSource");
+	glCompileShader = (PFNGLCOMPILESHADERPROC) wglGetProcAddress("glCompileShader");
+	glGetShaderiv = (PFNGLGETSHADERIVPROC) wglGetProcAddress("glGetShaderiv");
+	glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC) wglGetProcAddress("glGetShaderInfoLog");
+	glCreateProgram = (PFNGLCREATEPROGRAMPROC) wglGetProcAddress("glCreateProgram");
+	glAttachShader = (PFNGLATTACHSHADERPROC) wglGetProcAddress("glAttachShader");
+	glLinkProgram = (PFNGLLINKPROGRAMPROC) wglGetProcAddress("glLinkProgram");
+	glGetProgramiv = (PFNGLGETPROGRAMIVPROC) wglGetProcAddress("glGetProgramiv");
+	glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC) wglGetProcAddress("glGetProgramInfoLog");
+	glUseProgram = (PFNGLUSEPROGRAMPROC) wglGetProcAddress("glUseProgram");
+	glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) wglGetProcAddress("glGetUniformLocation");
+	glGetUniformBlockIndex = (PFNGLGETUNIFORMBLOCKINDEXPROC) wglGetProcAddress("glGetUniformBlockIndex");
+	glUniformBlockBinding = (PFNGLUNIFORMBLOCKBINDINGPROC) wglGetProcAddress("glUniformBlockBinding");
+	glUniform1i = (PFNGLUNIFORM1IPROC) wglGetProcAddress("glUniform1i");
+	glUniform1f = (PFNGLUNIFORM1FPROC) wglGetProcAddress("glUniform1f");
+	glUniform2f = (PFNGLUNIFORM2FPROC) wglGetProcAddress("glUniform2f");
+	glUniform4f = (PFNGLUNIFORM4FPROC) wglGetProcAddress("glUniform4f");
+
+	return	glGenFramebuffers
+			&& glGenRenderbuffers
+			&& glBindRenderbuffer
+			&& glRenderbufferStorage
+			&& glDeleteFramebuffers
+			&& glDeleteRenderbuffers
+			&& glBindFramebuffer
+			&& glFramebufferTexture2D
+			&& glFramebufferRenderbuffer
+			&& glCheckFramebufferStatus
+			&& glBlitFramebuffer
+			&& glFenceSync
+			&& glClientWaitSync
+			&& glDeleteSync
+			&& glGenBuffers
+			&& glDeleteBuffers
+			&& glBindBuffer
+			&& glBufferData
+			&& glMapBuffer
+			&& glUnmapBuffer
+			&& glBufferSubData
+			&& glBindBufferBase
+			&& glActiveTexture
+			&& glGenVertexArrays
+			&& glDeleteVertexArrays
+			&& glBindVertexArray
+			&& glCreateShader
+			&& glDeleteShader
+			&& glDeleteProgram
+			&& glShaderSource
+			&& glCompileShader
+			&& glGetShaderiv
+			&& glGetShaderInfoLog
+			&& glCreateProgram
+			&& glAttachShader
+			&& glLinkProgram
+			&& glGetProgramiv
+			&& glGetProgramInfoLog
+			&& glUseProgram
+			&& glGetUniformLocation
+			&& glGetUniformBlockIndex
+			&& glUniformBlockBinding
+			&& glUniform1i
+			&& glUniform1f
+			&& glUniform2f
+			&& glUniform4f
+			;
+}

src/render/GLExtensions.h

@@ -0,0 +1,201 @@
+/* -LICENSE-START-
+ ** Copyright (c) 2012 Blackmagic Design
+ **  
+ ** Permission is hereby granted, free of charge, to any person or organization 
+ ** obtaining a copy of the software and accompanying documentation (the 
+ ** "Software") to use, reproduce, display, distribute, sub-license, execute, 
+ ** and transmit the Software, and to prepare derivative works of the Software, 
+ ** and to permit third-parties to whom the Software is furnished to do so, in 
+ ** accordance with:
+ ** 
+ ** (1) if the Software is obtained from Blackmagic Design, the End User License 
+ ** Agreement for the Software Development Kit ("EULA") available at 
+ ** https://www.blackmagicdesign.com/EULA/DeckLinkSDK; or
+ ** 
+ ** (2) if the Software is obtained from any third party, such licensing terms 
+ ** as notified by that third party,
+ ** 
+ ** and all subject to the following:
+ ** 
+ ** (3) the copyright notices in the Software and this entire statement, 
+ ** including the above license grant, this restriction and the following 
+ ** disclaimer, must be included in all copies of the Software, in whole or in 
+ ** part, and all derivative works of the Software, unless such copies or 
+ ** derivative works are solely in the form of machine-executable object code 
+ ** generated by a source language processor.
+ ** 
+ ** (4) THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+ ** OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ ** FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 
+ ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 
+ ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 
+ ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ ** DEALINGS IN THE SOFTWARE.
+ ** 
+ ** A copy of the Software is available free of charge at 
+ ** https://www.blackmagicdesign.com/desktopvideo_sdk under the EULA.
+ ** 
+ ** -LICENSE-END-
+ */
+//
+//  GLExtensions.h
+//  LoopThroughWithOpenGLCompositing
+//
+
+#ifndef __GLEXTENSIONS_H__
+#define __GLEXTENSIONS_H__
+
+#include <windows.h>
+#include <gl/gl.h>
+
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+
+#define GL_BGRA									0x80E1
+#define GL_UNSIGNED_INT_8_8_8_8_REV				0x8367
+#define GL_STREAM_DRAW							0x88E0
+#define GL_STREAM_READ							0x88E1
+#define GL_STREAM_COPY							0x88E2
+#define GL_DYNAMIC_DRAW							0x88E8
+#define GL_UNIFORM_BUFFER						0x8A11
+#define GL_RGBA8								0x8058
+#define GL_RGBA16F								0x881A
+#define GL_TEXTURE0								0x84C0
+#define GL_ACTIVE_TEXTURE						0x84E0
+#define GL_ARRAY_BUFFER							0x8892
+#define GL_PIXEL_PACK_BUFFER					0x88EB
+#define GL_PIXEL_UNPACK_BUFFER					0x88EC
+#define GL_PIXEL_UNPACK_BUFFER_BINDING			0x88EF
+#define GL_FRAGMENT_SHADER						0x8B30
+#define GL_VERTEX_SHADER						0x8B31
+#define GL_COMPILE_STATUS						0x8B81
+#define GL_LINK_STATUS							0x8B82
+#define GL_INVALID_INDEX						0xFFFFFFFFu
+#define GL_MAX_TEXTURE_IMAGE_UNITS				0x8872
+#define GL_RENDERBUFFER_EXT						0x8D41
+#define GL_FRAMEBUFFER_EXT						0x8D40
+#define GL_FRAMEBUFFER_COMPLETE_EXT				0x8CD5
+#define GL_COLOR_ATTACHMENT0_EXT				0x8CE0
+#define GL_READ_FRAMEBUFFER						0x8CA8
+#define GL_DRAW_FRAMEBUFFER						0x8CA9
+#define GL_RENDERBUFFER							0x8D41
+#define GL_FRAMEBUFFER							0x8D40
+#define GL_FRAMEBUFFER_COMPLETE					0x8CD5
+#define GL_COLOR_ATTACHMENT0					0x8CE0
+#define GL_DEPTH_COMPONENT24					0x81A6
+#define GL_CLAMP_TO_EDGE						0x812F
+#define GL_DEPTH_ATTACHMENT_EXT					0x8D00
+#define GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD	0x9160
+#define GL_SYNC_GPU_COMMANDS_COMPLETE			0x9117
+#define GL_SYNC_FLUSH_COMMANDS_BIT				0x00000001
+#define GL_ALREADY_SIGNALED						0x911A
+#define GL_TIMEOUT_EXPIRED						0x911B
+#define GL_CONDITION_SATISFIED					0x911C
+#define GL_WAIT_FAILED							0x911D
+#define GL_READ_ONLY							0x88B8
+
+typedef struct __GLsync *GLsync;
+typedef unsigned __int64 GLuint64;
+typedef ptrdiff_t GLintptr;
+typedef ptrdiff_t GLsizeiptr;
+typedef char GLchar;
+
+typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
+typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage);
+typedef GLvoid* (APIENTRYP PFNGLMAPBUFFERPROC) (GLenum target, GLenum access);
+typedef GLboolean (APIENTRYP PFNGLUNMAPBUFFERPROC) (GLenum target);
+typedef void (APIENTRYP PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
+typedef void (APIENTRYP PFNGLCOMPILESHADERPROC) (GLuint shader);
+typedef GLuint (APIENTRYP PFNGLCREATEPROGRAMPROC) (void);
+typedef GLuint (APIENTRYP PFNGLCREATESHADERPROC) (GLenum type);
+typedef void (APIENTRYP PFNGLDELETESHADERPROC) (GLuint shader);
+typedef void (APIENTRYP PFNGLDELETEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef void (APIENTRYP PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef GLint (APIENTRYP PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const GLchar *name);
+typedef void (APIENTRYP PFNGLLINKPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const GLchar* *string, const GLint *length);
+typedef void (APIENTRYP PFNGLUSEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLUNIFORM1FPROC) (GLint location, GLfloat v0);
+typedef void (APIENTRYP PFNGLUNIFORM1IPROC) (GLint location, GLint v0);
+typedef void (APIENTRYP PFNGLUNIFORM2FPROC) (GLint location, GLfloat v0, GLfloat v1);
+typedef void (APIENTRYP PFNGLUNIFORM4FPROC) (GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);
+typedef GLuint (APIENTRYP PFNGLGETUNIFORMBLOCKINDEXPROC) (GLuint program, const GLchar* uniformBlockName);
+typedef void (APIENTRYP PFNGLUNIFORMBLOCKBINDINGPROC) (GLuint program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
+typedef void (APIENTRYP PFNGLACTIVETEXTUREPROC) (GLenum texture);
+typedef void (APIENTRYP PFNGLBINDBUFFERBASEPROC) (GLenum target, GLuint index, GLuint buffer);
+typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid* data);
+typedef void (APIENTRYP PFNGLBINDVERTEXARRAYPROC) (GLuint array);
+typedef void (APIENTRYP PFNGLDELETEVERTEXARRAYSPROC) (GLsizei n, const GLuint* arrays);
+typedef void (APIENTRYP PFNGLGENVERTEXARRAYSPROC) (GLsizei n, GLuint* arrays);
+typedef GLsync (APIENTRYP PFNGLFENCESYNCPROC) (GLenum condition, GLbitfield flags);
+typedef void (APIENTRYP PFNGLDELETESYNCPROC) (GLsync sync);
+typedef GLenum (APIENTRYP PFNGLCLIENTWAITSYNCPROC) (GLsync sync, GLbitfield flags, GLuint64 timeout);
+typedef void (APIENTRYP PFNGLBINDRENDERBUFFERPROC) (GLenum target, GLuint renderbuffer);
+typedef void (APIENTRYP PFNGLDELETERENDERBUFFERSPROC) (GLsizei n, const GLuint *renderbuffers);
+typedef void (APIENTRYP PFNGLGENRENDERBUFFERSPROC) (GLsizei n, GLuint *renderbuffers);
+typedef void (APIENTRYP PFNGLRENDERBUFFERSTORAGEPROC) (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+typedef void (APIENTRYP PFNGLBINDFRAMEBUFFERPROC) (GLenum target, GLuint framebuffer);
+typedef void (APIENTRYP PFNGLDELETEFRAMEBUFFERSPROC) (GLsizei n, const GLuint *framebuffers);
+typedef void (APIENTRYP PFNGLGENFRAMEBUFFERSPROC) (GLsizei n, GLuint *framebuffers);
+typedef GLenum (APIENTRYP PFNGLCHECKFRAMEBUFFERSTATUSPROC) (GLenum target);
+typedef void (APIENTRYP PFNGLFRAMEBUFFERTEXTURE2DPROC) (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
+typedef void (APIENTRYP PFNGLFRAMEBUFFERRENDERBUFFERPROC) (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+typedef void (APIENTRYP PFNGLBLITFRAMEBUFFERPROC) (GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+
+extern PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers;
+extern PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers;
+extern PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer;
+extern PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage;
+extern PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers;
+extern PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers;
+extern PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer;
+extern PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D;
+extern PFNGLFRAMEBUFFERRENDERBUFFERPROC glFramebufferRenderbuffer;
+extern PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus;
+extern PFNGLBLITFRAMEBUFFERPROC glBlitFramebuffer;
+extern PFNGLFENCESYNCPROC glFenceSync;
+extern PFNGLCLIENTWAITSYNCPROC glClientWaitSync;
+extern PFNGLDELETESYNCPROC glDeleteSync;
+extern PFNGLGENBUFFERSPROC glGenBuffers;
+extern PFNGLDELETEBUFFERSPROC glDeleteBuffers;
+extern PFNGLBINDBUFFERPROC glBindBuffer;
+extern PFNGLBUFFERDATAPROC glBufferData;
+extern PFNGLMAPBUFFERPROC glMapBuffer;
+extern PFNGLUNMAPBUFFERPROC glUnmapBuffer;
+extern PFNGLBUFFERSUBDATAPROC glBufferSubData;
+extern PFNGLBINDBUFFERBASEPROC glBindBufferBase;
+extern PFNGLACTIVETEXTUREPROC glActiveTexture;
+extern PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
+extern PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;
+extern PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
+extern PFNGLCREATESHADERPROC glCreateShader;
+extern PFNGLDELETESHADERPROC glDeleteShader;
+extern PFNGLDELETEPROGRAMPROC glDeleteProgram;
+extern PFNGLSHADERSOURCEPROC glShaderSource;
+extern PFNGLCOMPILESHADERPROC glCompileShader;
+extern PFNGLGETSHADERIVPROC glGetShaderiv;
+extern PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
+extern PFNGLCREATEPROGRAMPROC glCreateProgram;
+extern PFNGLATTACHSHADERPROC glAttachShader;
+extern PFNGLLINKPROGRAMPROC glLinkProgram;
+extern PFNGLGETPROGRAMIVPROC glGetProgramiv;
+extern PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
+extern PFNGLUSEPROGRAMPROC glUseProgram;
+extern PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
+extern PFNGLGETUNIFORMBLOCKINDEXPROC glGetUniformBlockIndex;
+extern PFNGLUNIFORMBLOCKBINDINGPROC glUniformBlockBinding;
+extern PFNGLUNIFORM1IPROC glUniform1i;
+extern PFNGLUNIFORM1FPROC glUniform1f;
+extern PFNGLUNIFORM2FPROC glUniform2f;
+extern PFNGLUNIFORM4FPROC glUniform4f;
+
+bool ResolveGLExtensions();
+
+#endif // __GLEXTENSIONS_H__
+

src/render/Std140Buffer.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <cstddef>
+#include <cstring>
+#include <vector>
+
+inline std::size_t AlignStd140(std::size_t offset, std::size_t alignment)
+{
+	const std::size_t mask = alignment - 1;
+	return (offset + mask) & ~mask;
+}
+
+template <typename TValue>
+inline void AppendStd140Value(std::vector<unsigned char>& buffer, std::size_t alignment, const TValue& value)
+{
+	const std::size_t offset = AlignStd140(buffer.size(), alignment);
+	if (buffer.size() < offset + sizeof(TValue))
+		buffer.resize(offset + sizeof(TValue), 0);
+	std::memcpy(buffer.data() + offset, &value, sizeof(TValue));
+}
+
+inline void AppendStd140Float(std::vector<unsigned char>& buffer, float value)
+{
+	AppendStd140Value(buffer, 4, value);
+}
+
+inline void AppendStd140Int(std::vector<unsigned char>& buffer, int value)
+{
+	AppendStd140Value(buffer, 4, value);
+}
+
+inline void AppendStd140Vec2(std::vector<unsigned char>& buffer, float x, float y)
+{
+	const std::size_t offset = AlignStd140(buffer.size(), 8);
+	if (buffer.size() < offset + sizeof(float) * 2)
+		buffer.resize(offset + sizeof(float) * 2, 0);
+	float values[2] = { x, y };
+	std::memcpy(buffer.data() + offset, values, sizeof(values));
+}
+
+inline void AppendStd140Vec4(std::vector<unsigned char>& buffer, float x, float y, float z, float w)
+{
+	const std::size_t offset = AlignStd140(buffer.size(), 16);
+	if (buffer.size() < offset + sizeof(float) * 4)
+		buffer.resize(offset + sizeof(float) * 4, 0);
+	float values[4] = { x, y, z, w };
+	std::memcpy(buffer.data() + offset, values, sizeof(values));
+}

src/runtime/RuntimeJson.cpp

@@ -0,0 +1,674 @@
+#include "stdafx.h"
+#include "RuntimeJson.h"
+
+#include <cerrno>
+#include <cctype>
+#include <cmath>
+#include <cstring>
+#include <iomanip>
+#include <limits>
+#include <sstream>
+
+namespace
+{
+int HexDigitValue(char ch)
+{
+	if (ch >= '0' && ch <= '9')
+		return ch - '0';
+	if (ch >= 'a' && ch <= 'f')
+		return ch - 'a' + 10;
+	if (ch >= 'A' && ch <= 'F')
+		return ch - 'A' + 10;
+	return -1;
+}
+
+bool IsHighSurrogate(unsigned int codePoint)
+{
+	return codePoint >= 0xD800 && codePoint <= 0xDBFF;
+}
+
+bool IsLowSurrogate(unsigned int codePoint)
+{
+	return codePoint >= 0xDC00 && codePoint <= 0xDFFF;
+}
+
+void AppendUtf8(unsigned int codePoint, std::ostringstream& output)
+{
+	if (codePoint <= 0x7F)
+	{
+		output << static_cast<char>(codePoint);
+	}
+	else if (codePoint <= 0x7FF)
+	{
+		output << static_cast<char>(0xC0 | ((codePoint >> 6) & 0x1F));
+		output << static_cast<char>(0x80 | (codePoint & 0x3F));
+	}
+	else if (codePoint <= 0xFFFF)
+	{
+		output << static_cast<char>(0xE0 | ((codePoint >> 12) & 0x0F));
+		output << static_cast<char>(0x80 | ((codePoint >> 6) & 0x3F));
+		output << static_cast<char>(0x80 | (codePoint & 0x3F));
+	}
+	else
+	{
+		output << static_cast<char>(0xF0 | ((codePoint >> 18) & 0x07));
+		output << static_cast<char>(0x80 | ((codePoint >> 12) & 0x3F));
+		output << static_cast<char>(0x80 | ((codePoint >> 6) & 0x3F));
+		output << static_cast<char>(0x80 | (codePoint & 0x3F));
+	}
+}
+
+void AppendControlEscape(unsigned char ch, std::ostringstream& output)
+{
+	const char* digits = "0123456789ABCDEF";
+	output << "\\u00" << digits[(ch >> 4) & 0x0F] << digits[ch & 0x0F];
+}
+
+class JsonParser
+{
+public:
+	JsonParser(const std::string& text, std::string& error)
+		: mText(text), mError(error), mPosition(0)
+	{
+	}
+
+	bool parse(JsonValue& value)
+	{
+		skipWhitespace();
+		if (!parseValue(value))
+			return false;
+
+		skipWhitespace();
+		if (mPosition != mText.size())
+		{
+			setError("Unexpected trailing characters in JSON input.");
+			return false;
+		}
+
+		return true;
+	}
+
+private:
+	bool parseValue(JsonValue& value)
+	{
+		if (mPosition >= mText.size())
+		{
+			setError("Unexpected end of JSON input.");
+			return false;
+		}
+
+		char ch = mText[mPosition];
+		if (ch == '{')
+			return parseObject(value);
+		if (ch == '[')
+			return parseArray(value);
+		if (ch == '"')
+		{
+			std::string stringValue;
+			if (!parseString(stringValue))
+				return false;
+			value = JsonValue(stringValue);
+			return true;
+		}
+		if (ch == 't')
+			return parseLiteral("true", JsonValue(true), value);
+		if (ch == 'f')
+			return parseLiteral("false", JsonValue(false), value);
+		if (ch == 'n')
+			return parseLiteral("null", JsonValue(), value);
+		if (ch == '-' || std::isdigit(static_cast<unsigned char>(ch)))
+			return parseNumber(value);
+
+		setError("Unexpected token while parsing JSON.");
+		return false;
+	}
+
+	bool parseObject(JsonValue& value)
+	{
+		value = JsonValue::MakeObject();
+		++mPosition;
+		skipWhitespace();
+		if (consume('}'))
+			return true;
+
+		while (mPosition < mText.size())
+		{
+			std::string key;
+			if (!parseString(key))
+				return false;
+
+			skipWhitespace();
+			if (!consume(':'))
+			{
+				setError("Expected ':' after JSON object key.");
+				return false;
+			}
+
+			skipWhitespace();
+			JsonValue item;
+			if (!parseValue(item))
+				return false;
+
+			value.set(key, item);
+
+			skipWhitespace();
+			if (consume('}'))
+				return true;
+			if (!consume(','))
+			{
+				setError("Expected ',' or '}' in JSON object.");
+				return false;
+			}
+			skipWhitespace();
+		}
+
+		setError("Unexpected end of JSON object.");
+		return false;
+	}
+
+	bool parseArray(JsonValue& value)
+	{
+		value = JsonValue::MakeArray();
+		++mPosition;
+		skipWhitespace();
+		if (consume(']'))
+			return true;
+
+		while (mPosition < mText.size())
+		{
+			JsonValue item;
+			if (!parseValue(item))
+				return false;
+
+			value.pushBack(item);
+
+			skipWhitespace();
+			if (consume(']'))
+				return true;
+			if (!consume(','))
+			{
+				setError("Expected ',' or ']' in JSON array.");
+				return false;
+			}
+			skipWhitespace();
+		}
+
+		setError("Unexpected end of JSON array.");
+		return false;
+	}
+
+	bool parseString(std::string& value)
+	{
+		if (!consume('"'))
+		{
+			setError("Expected string literal.");
+			return false;
+		}
+
+		std::ostringstream result;
+		while (mPosition < mText.size())
+		{
+			char ch = mText[mPosition++];
+			if (ch == '"')
+			{
+				value = result.str();
+				return true;
+			}
+
+			if (ch == '\\')
+			{
+				if (mPosition >= mText.size())
+				{
+					setError("Unexpected end of escaped JSON string.");
+					return false;
+				}
+
+				char escaped = mText[mPosition++];
+				switch (escaped)
+				{
+				case '"': result << '"'; break;
+				case '\\': result << '\\'; break;
+				case '/': result << '/'; break;
+				case 'b': result << '\b'; break;
+				case 'f': result << '\f'; break;
+				case 'n': result << '\n'; break;
+				case 'r': result << '\r'; break;
+				case 't': result << '\t'; break;
+				case 'u':
+					if (!parseUnicodeEscape(result))
+						return false;
+					break;
+				default:
+					setError("Invalid escape sequence in JSON string.");
+					return false;
+				}
+			}
+			else
+			{
+				if (static_cast<unsigned char>(ch) < 0x20)
+				{
+					setError("Unescaped control character in JSON string.");
+					return false;
+				}
+				result << ch;
+			}
+		}
+
+		setError("Unexpected end of JSON string.");
+		return false;
+	}
+
+	bool parseHexCodePoint(unsigned int& codePoint)
+	{
+		if (mPosition + 4 > mText.size())
+		{
+			setError("Unexpected end of Unicode escape sequence.");
+			return false;
+		}
+
+		codePoint = 0;
+		for (int i = 0; i < 4; ++i)
+		{
+			const int digit = HexDigitValue(mText[mPosition + i]);
+			if (digit < 0)
+			{
+				setError("Invalid Unicode escape sequence in JSON string.");
+				return false;
+			}
+			codePoint = (codePoint << 4) | static_cast<unsigned int>(digit);
+		}
+
+		mPosition += 4;
+		return true;
+	}
+
+	bool parseUnicodeEscape(std::ostringstream& result)
+	{
+		unsigned int codePoint = 0;
+		if (!parseHexCodePoint(codePoint))
+			return false;
+
+		if (IsHighSurrogate(codePoint))
+		{
+			if (mPosition + 2 > mText.size() || mText[mPosition] != '\\' || mText[mPosition + 1] != 'u')
+			{
+				setError("High surrogate Unicode escape must be followed by a low surrogate.");
+				return false;
+			}
+
+			mPosition += 2;
+			unsigned int lowSurrogate = 0;
+			if (!parseHexCodePoint(lowSurrogate))
+				return false;
+			if (!IsLowSurrogate(lowSurrogate))
+			{
+				setError("High surrogate Unicode escape must be followed by a low surrogate.");
+				return false;
+			}
+
+			codePoint = 0x10000 + (((codePoint - 0xD800) << 10) | (lowSurrogate - 0xDC00));
+		}
+		else if (IsLowSurrogate(codePoint))
+		{
+			setError("Low surrogate Unicode escape without preceding high surrogate.");
+			return false;
+		}
+
+		AppendUtf8(codePoint, result);
+		return true;
+	}
+
+	bool parseNumber(JsonValue& value)
+	{
+		std::size_t start = mPosition;
+
+		if (mText[mPosition] == '-')
+			++mPosition;
+
+		if (mPosition >= mText.size())
+		{
+			setError("Invalid JSON number.");
+			return false;
+		}
+
+		if (mText[mPosition] == '0')
+		{
+			++mPosition;
+			if (mPosition < mText.size() && std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+			{
+				setError("JSON numbers must not contain leading zeroes.");
+				return false;
+			}
+		}
+		else if (mText[mPosition] >= '1' && mText[mPosition] <= '9')
+		{
+			while (mPosition < mText.size() && std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+				++mPosition;
+		}
+		else
+		{
+			setError("Invalid JSON number.");
+			return false;
+		}
+
+		if (mPosition < mText.size() && mText[mPosition] == '.')
+		{
+			++mPosition;
+			if (mPosition >= mText.size() || !std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+			{
+				setError("JSON number fraction must contain at least one digit.");
+				return false;
+			}
+			while (mPosition < mText.size() && std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+				++mPosition;
+		}
+
+		if (mPosition < mText.size() && (mText[mPosition] == 'e' || mText[mPosition] == 'E'))
+		{
+			++mPosition;
+			if (mPosition < mText.size() && (mText[mPosition] == '+' || mText[mPosition] == '-'))
+				++mPosition;
+			if (mPosition >= mText.size() || !std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+			{
+				setError("JSON number exponent must contain at least one digit.");
+				return false;
+			}
+			while (mPosition < mText.size() && std::isdigit(static_cast<unsigned char>(mText[mPosition])))
+				++mPosition;
+		}
+
+		std::string token = mText.substr(start, mPosition - start);
+		char* endPtr = nullptr;
+		errno = 0;
+		double parsed = strtod(token.c_str(), &endPtr);
+		if (endPtr == token.c_str() || *endPtr != '\0' || errno == ERANGE || !std::isfinite(parsed))
+		{
+			setError("Invalid JSON number.");
+			return false;
+		}
+
+		value = JsonValue(parsed);
+		return true;
+	}
+
+	bool parseLiteral(const char* literal, const JsonValue& literalValue, JsonValue& value)
+	{
+		std::size_t length = strlen(literal);
+		if (mText.compare(mPosition, length, literal) != 0)
+		{
+			setError("Invalid JSON literal.");
+			return false;
+		}
+
+		mPosition += length;
+		value = literalValue;
+		return true;
+	}
+
+	void skipWhitespace()
+	{
+		while (mPosition < mText.size() && std::isspace(static_cast<unsigned char>(mText[mPosition])))
+			++mPosition;
+	}
+
+	bool consume(char expected)
+	{
+		if (mPosition < mText.size() && mText[mPosition] == expected)
+		{
+			++mPosition;
+			return true;
+		}
+		return false;
+	}
+
+	void setError(const std::string& error)
+	{
+		if (mError.empty())
+			mError = error;
+	}
+
+	const std::string& mText;
+	std::string& mError;
+	std::size_t mPosition;
+};
+
+void SerializeJsonImpl(const JsonValue& value, std::ostringstream& output, bool pretty, int indentLevel)
+{
+	auto indent = [&](int level) {
+		if (!pretty)
+			return;
+		for (int i = 0; i < level; ++i)
+			output << "  ";
+	};
+
+	switch (value.type())
+	{
+	case JsonValue::Type::Null:
+		output << "null";
+		break;
+	case JsonValue::Type::Boolean:
+		output << (value.asBoolean() ? "true" : "false");
+		break;
+	case JsonValue::Type::Number:
+	{
+		double number = value.asNumber();
+		if (std::isfinite(number))
+		{
+			output << std::setprecision(15) << number;
+		}
+		else
+		{
+			output << "0";
+		}
+		break;
+	}
+	case JsonValue::Type::String:
+	{
+		output << '"';
+		for (char ch : value.asString())
+		{
+			switch (ch)
+			{
+			case '"': output << "\\\""; break;
+			case '\\': output << "\\\\"; break;
+			case '\b': output << "\\b"; break;
+			case '\f': output << "\\f"; break;
+			case '\n': output << "\\n"; break;
+			case '\r': output << "\\r"; break;
+			case '\t': output << "\\t"; break;
+			default:
+				if (static_cast<unsigned char>(ch) < 0x20)
+					AppendControlEscape(static_cast<unsigned char>(ch), output);
+				else
+					output << ch;
+				break;
+			}
+		}
+		output << '"';
+		break;
+	}
+	case JsonValue::Type::Array:
+	{
+		output << "[";
+		const std::vector<JsonValue>& array = value.asArray();
+		if (!array.empty())
+		{
+			if (pretty)
+				output << "\n";
+			for (std::size_t i = 0; i < array.size(); ++i)
+			{
+				indent(indentLevel + 1);
+				SerializeJsonImpl(array[i], output, pretty, indentLevel + 1);
+				if (i + 1 != array.size())
+					output << ",";
+				if (pretty)
+					output << "\n";
+			}
+			indent(indentLevel);
+		}
+		output << "]";
+		break;
+	}
+	case JsonValue::Type::Object:
+	{
+		output << "{";
+		const std::map<std::string, JsonValue>& object = value.asObject();
+		if (!object.empty())
+		{
+			if (pretty)
+				output << "\n";
+			std::size_t index = 0;
+			for (const auto& item : object)
+			{
+				indent(indentLevel + 1);
+				SerializeJsonImpl(JsonValue(item.first), output, pretty, indentLevel + 1);
+				output << (pretty ? ": " : ":");
+				SerializeJsonImpl(item.second, output, pretty, indentLevel + 1);
+				if (++index != object.size())
+					output << ",";
+				if (pretty)
+					output << "\n";
+			}
+			indent(indentLevel);
+		}
+		output << "}";
+		break;
+	}
+	}
+}
+}
+
+JsonValue::JsonValue()
+	: mType(Type::Null), mBooleanValue(false), mNumberValue(0.0)
+{
+}
+
+JsonValue::JsonValue(bool value)
+	: mType(Type::Boolean), mBooleanValue(value), mNumberValue(0.0)
+{
+}
+
+JsonValue::JsonValue(double value)
+	: mType(Type::Number), mBooleanValue(false), mNumberValue(value)
+{
+}
+
+JsonValue::JsonValue(const char* value)
+	: mType(Type::String), mBooleanValue(false), mNumberValue(0.0), mStringValue(value ? value : "")
+{
+}
+
+JsonValue::JsonValue(const std::string& value)
+	: mType(Type::String), mBooleanValue(false), mNumberValue(0.0), mStringValue(value)
+{
+}
+
+JsonValue JsonValue::MakeArray()
+{
+	JsonValue value;
+	value.reset(Type::Array);
+	return value;
+}
+
+JsonValue JsonValue::MakeObject()
+{
+	JsonValue value;
+	value.reset(Type::Object);
+	return value;
+}
+
+bool JsonValue::asBoolean(bool fallback) const
+{
+	return mType == Type::Boolean ? mBooleanValue : fallback;
+}
+
+double JsonValue::asNumber(double fallback) const
+{
+	return mType == Type::Number ? mNumberValue : fallback;
+}
+
+const std::string& JsonValue::asString() const
+{
+	static const std::string emptyString;
+	return mType == Type::String ? mStringValue : emptyString;
+}
+
+const std::vector<JsonValue>& JsonValue::asArray() const
+{
+	static const std::vector<JsonValue> emptyArray;
+	return mType == Type::Array ? mArrayValue : emptyArray;
+}
+
+const std::map<std::string, JsonValue>& JsonValue::asObject() const
+{
+	static const std::map<std::string, JsonValue> emptyObject;
+	return mType == Type::Object ? mObjectValue : emptyObject;
+}
+
+std::vector<JsonValue>& JsonValue::array()
+{
+	if (mType != Type::Array)
+		reset(Type::Array);
+	return mArrayValue;
+}
+
+std::map<std::string, JsonValue>& JsonValue::object()
+{
+	if (mType != Type::Object)
+		reset(Type::Object);
+	return mObjectValue;
+}
+
+void JsonValue::pushBack(const JsonValue& value)
+{
+	array().push_back(value);
+}
+
+void JsonValue::set(const std::string& key, const JsonValue& value)
+{
+	object()[key] = value;
+}
+
+const JsonValue* JsonValue::find(const std::string& key) const
+{
+	if (mType != Type::Object)
+		return nullptr;
+
+	auto iterator = mObjectValue.find(key);
+	return iterator != mObjectValue.end() ? &iterator->second : nullptr;
+}
+
+void JsonValue::reset(Type type)
+{
+	mType = type;
+	mBooleanValue = false;
+	mNumberValue = 0.0;
+	mStringValue.clear();
+	mArrayValue.clear();
+	mObjectValue.clear();
+}
+
+bool ParseJson(const std::string& text, JsonValue& value, std::string& error)
+{
+	error.clear();
+	JsonParser parser(text, error);
+	return parser.parse(value);
+}
+
+std::string SerializeJson(const JsonValue& value, bool pretty)
+{
+	std::ostringstream output;
+	SerializeJsonImpl(value, output, pretty, 0);
+	return output.str();
+}
+
+std::vector<double> JsonArrayToNumbers(const JsonValue& value)
+{
+	std::vector<double> numbers;
+	for (const JsonValue& item : value.asArray())
+	{
+		if (item.isNumber())
+			numbers.push_back(item.asNumber());
+	}
+	return numbers;
+}

src/runtime/RuntimeJson.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+class JsonValue
+{
+public:
+	enum class Type
+	{
+		Null,
+		Boolean,
+		Number,
+		String,
+		Array,
+		Object
+	};
+
+	JsonValue();
+	explicit JsonValue(bool value);
+	explicit JsonValue(double value);
+	explicit JsonValue(const char* value);
+	explicit JsonValue(const std::string& value);
+
+	static JsonValue MakeArray();
+	static JsonValue MakeObject();
+
+	Type type() const { return mType; }
+
+	bool isNull() const { return mType == Type::Null; }
+	bool isBoolean() const { return mType == Type::Boolean; }
+	bool isNumber() const { return mType == Type::Number; }
+	bool isString() const { return mType == Type::String; }
+	bool isArray() const { return mType == Type::Array; }
+	bool isObject() const { return mType == Type::Object; }
+
+	bool asBoolean(bool fallback = false) const;
+	double asNumber(double fallback = 0.0) const;
+	const std::string& asString() const;
+	const std::vector<JsonValue>& asArray() const;
+	const std::map<std::string, JsonValue>& asObject() const;
+
+	std::vector<JsonValue>& array();
+	std::map<std::string, JsonValue>& object();
+
+	void pushBack(const JsonValue& value);
+	void set(const std::string& key, const JsonValue& value);
+
+	const JsonValue* find(const std::string& key) const;
+
+private:
+	void reset(Type type);
+
+	Type mType;
+	bool mBooleanValue;
+	double mNumberValue;
+	std::string mStringValue;
+	std::vector<JsonValue> mArrayValue;
+	std::map<std::string, JsonValue> mObjectValue;
+};
+
+bool ParseJson(const std::string& text, JsonValue& value, std::string& error);
+std::string SerializeJson(const JsonValue& value, bool pretty = false);
+std::vector<double> JsonArrayToNumbers(const JsonValue& value);

src/runtime/RuntimeParameterUtils.cpp

@@ -0,0 +1,196 @@
+#include "stdafx.h"
+#include "RuntimeParameterUtils.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cctype>
+#include <vector>
+
+namespace
+{
+std::string TrimText(const std::string& text)
+{
+	std::size_t start = 0;
+	while (start < text.size() && std::isspace(static_cast<unsigned char>(text[start])))
+		++start;
+
+	std::size_t end = text.size();
+	while (end > start && std::isspace(static_cast<unsigned char>(text[end - 1])))
+		--end;
+
+	return text.substr(start, end - start);
+}
+
+bool IsFiniteNumber(double value)
+{
+	return std::isfinite(value) != 0;
+}
+
+std::string NormalizeTextValue(const std::string& text, unsigned maxLength)
+{
+	std::string normalized;
+	normalized.reserve(std::min<std::size_t>(text.size(), maxLength));
+	for (unsigned char ch : text)
+	{
+		if (ch < 32 || ch > 126)
+			continue;
+		if (normalized.size() >= maxLength)
+			break;
+		normalized.push_back(static_cast<char>(ch));
+	}
+	return normalized;
+}
+}
+
+std::string MakeSafePresetFileStem(const std::string& presetName)
+{
+	std::string trimmed = TrimText(presetName);
+	std::string safe;
+	safe.reserve(trimmed.size());
+
+	for (unsigned char ch : trimmed)
+	{
+		if (std::isalnum(ch))
+			safe.push_back(static_cast<char>(std::tolower(ch)));
+		else if (ch == ' ' || ch == '-' || ch == '_')
+		{
+			if (safe.empty() || safe.back() == '-')
+				continue;
+			safe.push_back('-');
+		}
+	}
+
+	while (!safe.empty() && safe.back() == '-')
+		safe.pop_back();
+
+	return safe;
+}
+
+ShaderParameterValue DefaultValueForDefinition(const ShaderParameterDefinition& definition)
+{
+	ShaderParameterValue value;
+	switch (definition.type)
+	{
+	case ShaderParameterType::Float:
+		value.numberValues = definition.defaultNumbers.empty() ? std::vector<double>{ 0.0 } : definition.defaultNumbers;
+		break;
+	case ShaderParameterType::Vec2:
+		value.numberValues = definition.defaultNumbers.size() == 2 ? definition.defaultNumbers : std::vector<double>{ 0.0, 0.0 };
+		break;
+	case ShaderParameterType::Color:
+		value.numberValues = definition.defaultNumbers.size() == 4 ? definition.defaultNumbers : std::vector<double>{ 1.0, 1.0, 1.0, 1.0 };
+		break;
+	case ShaderParameterType::Boolean:
+		value.booleanValue = definition.defaultBoolean;
+		break;
+	case ShaderParameterType::Enum:
+		value.enumValue = definition.defaultEnumValue;
+		break;
+	case ShaderParameterType::Text:
+		value.textValue = NormalizeTextValue(definition.defaultTextValue, definition.maxLength);
+		break;
+	case ShaderParameterType::Trigger:
+		value.numberValues = { 0.0, -1000000.0 };
+		break;
+	}
+	return value;
+}
+
+bool NormalizeAndValidateParameterValue(const ShaderParameterDefinition& definition, const JsonValue& value, ShaderParameterValue& normalizedValue, std::string& error)
+{
+	normalizedValue = DefaultValueForDefinition(definition);
+
+	switch (definition.type)
+	{
+	case ShaderParameterType::Float:
+	{
+		if (!value.isNumber())
+		{
+			error = "Expected numeric value for float parameter '" + definition.id + "'.";
+			return false;
+		}
+		double number = value.asNumber();
+		if (!IsFiniteNumber(number))
+		{
+			error = "Float parameter '" + definition.id + "' must be finite.";
+			return false;
+		}
+		if (!definition.minNumbers.empty())
+			number = std::max(number, definition.minNumbers.front());
+		if (!definition.maxNumbers.empty())
+			number = std::min(number, definition.maxNumbers.front());
+		normalizedValue.numberValues = { number };
+		return true;
+	}
+	case ShaderParameterType::Vec2:
+	case ShaderParameterType::Color:
+	{
+		std::vector<double> numbers = JsonArrayToNumbers(value);
+		const std::size_t expectedSize = definition.type == ShaderParameterType::Vec2 ? 2 : 4;
+		if (numbers.size() != expectedSize)
+		{
+			error = "Expected array value of size " + std::to_string(expectedSize) + " for parameter '" + definition.id + "'.";
+			return false;
+		}
+		for (std::size_t index = 0; index < numbers.size(); ++index)
+		{
+			if (!IsFiniteNumber(numbers[index]))
+			{
+				error = "Parameter '" + definition.id + "' contains a non-finite value.";
+				return false;
+			}
+			if (index < definition.minNumbers.size())
+				numbers[index] = std::max(numbers[index], definition.minNumbers[index]);
+			if (index < definition.maxNumbers.size())
+				numbers[index] = std::min(numbers[index], definition.maxNumbers[index]);
+		}
+		normalizedValue.numberValues = numbers;
+		return true;
+	}
+	case ShaderParameterType::Boolean:
+		if (!value.isBoolean())
+		{
+			error = "Expected boolean value for parameter '" + definition.id + "'.";
+			return false;
+		}
+		normalizedValue.booleanValue = value.asBoolean();
+		return true;
+	case ShaderParameterType::Enum:
+	{
+		if (!value.isString())
+		{
+			error = "Expected string value for enum parameter '" + definition.id + "'.";
+			return false;
+		}
+		const std::string selectedValue = value.asString();
+		for (const ShaderParameterOption& option : definition.enumOptions)
+		{
+			if (option.value == selectedValue)
+			{
+				normalizedValue.enumValue = selectedValue;
+				return true;
+			}
+		}
+		error = "Enum parameter '" + definition.id + "' received unsupported option '" + selectedValue + "'.";
+		return false;
+	}
+	case ShaderParameterType::Text:
+		if (!value.isString())
+		{
+			error = "Expected string value for text parameter '" + definition.id + "'.";
+			return false;
+		}
+		normalizedValue.textValue = NormalizeTextValue(value.asString(), definition.maxLength);
+		return true;
+	case ShaderParameterType::Trigger:
+		if (!value.isNumber() && !value.isBoolean())
+		{
+			error = "Expected numeric or boolean value for trigger parameter '" + definition.id + "'.";
+			return false;
+		}
+		normalizedValue.numberValues = { value.isNumber() ? std::max(0.0, std::floor(value.asNumber())) : 0.0, -1000000.0 };
+		return true;
+	}
+
+	return false;
+}

src/runtime/RuntimeParameterUtils.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include "RuntimeJson.h"
+#include "ShaderTypes.h"
+
+#include <string>
+
+std::string MakeSafePresetFileStem(const std::string& presetName);
+ShaderParameterValue DefaultValueForDefinition(const ShaderParameterDefinition& definition);
+bool NormalizeAndValidateParameterValue(const ShaderParameterDefinition& definition, const JsonValue& value, ShaderParameterValue& normalizedValue, std::string& error);

src/shader/ShaderCompiler.cpp

@@ -0,0 +1,326 @@
+#include "stdafx.h"
+#include "ShaderCompiler.h"
+
+#include "NativeHandles.h"
+
+#include <fstream>
+#include <cctype>
+#include <regex>
+#include <sstream>
+#include <vector>
+
+namespace
+{
+std::string ReplaceAll(std::string text, const std::string& from, const std::string& to)
+{
+	std::size_t offset = 0;
+	while ((offset = text.find(from, offset)) != std::string::npos)
+	{
+		text.replace(offset, from.length(), to);
+		offset += to.length();
+	}
+	return text;
+}
+
+std::string SlangCBufferTypeForParameter(ShaderParameterType type)
+{
+	switch (type)
+	{
+	case ShaderParameterType::Float: return "float";
+	case ShaderParameterType::Vec2: return "float2";
+	case ShaderParameterType::Color: return "float4";
+	case ShaderParameterType::Boolean: return "bool";
+	case ShaderParameterType::Enum: return "int";
+	case ShaderParameterType::Text: return "";
+	case ShaderParameterType::Trigger: return "int";
+	}
+	return "float";
+}
+
+std::string CapitalizeIdentifier(const std::string& identifier)
+{
+	if (identifier.empty())
+		return identifier;
+	std::string text = identifier;
+	text[0] = static_cast<char>(std::toupper(static_cast<unsigned char>(text[0])));
+	return text;
+}
+
+std::string BuildParameterUniforms(const std::vector<ShaderParameterDefinition>& parameters)
+{
+	std::ostringstream source;
+	for (const ShaderParameterDefinition& definition : parameters)
+	{
+		if (definition.type == ShaderParameterType::Text)
+			continue;
+		if (definition.type == ShaderParameterType::Trigger)
+		{
+			source << "\tint " << definition.id << ";\n";
+			source << "\tfloat " << definition.id << "Time;\n";
+			continue;
+		}
+		source << "\t" << SlangCBufferTypeForParameter(definition.type) << " " << definition.id << ";\n";
+	}
+	return source.str();
+}
+
+std::string BuildHistorySamplerDeclarations(const std::string& samplerPrefix, unsigned historyLength)
+{
+	std::ostringstream source;
+	for (unsigned index = 0; index < historyLength; ++index)
+		source << "Sampler2D<float4> " << samplerPrefix << index << ";\n";
+	return source.str();
+}
+
+std::string BuildTextureSamplerDeclarations(const std::vector<ShaderTextureAsset>& textureAssets)
+{
+	std::ostringstream source;
+	for (const ShaderTextureAsset& textureAsset : textureAssets)
+		source << "Sampler2D<float4> " << textureAsset.id << ";\n";
+	if (!textureAssets.empty())
+		source << "\n";
+	return source.str();
+}
+
+std::string BuildTextSamplerDeclarations(const std::vector<ShaderParameterDefinition>& parameters)
+{
+	std::ostringstream source;
+	for (const ShaderParameterDefinition& definition : parameters)
+	{
+		if (definition.type != ShaderParameterType::Text)
+			continue;
+		source << "Sampler2D<float4> " << definition.id << "Texture;\n";
+	}
+	if (source.tellp() > 0)
+		source << "\n";
+	return source.str();
+}
+
+std::string BuildTextHelpers(const std::vector<ShaderParameterDefinition>& parameters)
+{
+	std::ostringstream source;
+	for (const ShaderParameterDefinition& definition : parameters)
+	{
+		if (definition.type != ShaderParameterType::Text)
+			continue;
+		const std::string suffix = CapitalizeIdentifier(definition.id);
+		source
+			<< "float sample" << suffix << "(float2 uv)\n"
+			<< "{\n"
+			<< "\tif (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0)\n"
+			<< "\t\treturn 0.0;\n"
+			<< "\treturn " << definition.id << "Texture.Sample(uv).r;\n"
+			<< "}\n\n"
+			<< "float4 draw" << suffix << "(float2 uv, float4 fillColor)\n"
+			<< "{\n"
+			<< "\tfloat alpha = sample" << suffix << "(uv) * fillColor.a;\n"
+			<< "\treturn float4(fillColor.rgb * alpha, alpha);\n"
+			<< "}\n\n";
+	}
+	return source.str();
+}
+
+std::string BuildHistorySwitchCases(const std::string& samplerPrefix, unsigned historyLength)
+{
+	std::ostringstream source;
+	for (unsigned index = 0; index < historyLength; ++index)
+		source << "\tcase " << index << ": return " << samplerPrefix << index << ".Sample(tc);\n";
+	return source.str();
+}
+}
+
+ShaderCompiler::ShaderCompiler(
+	const std::filesystem::path& repoRoot,
+	const std::filesystem::path& wrapperPath,
+	const std::filesystem::path& generatedGlslPath,
+	const std::filesystem::path& patchedGlslPath,
+	unsigned maxTemporalHistoryFrames)
+	: mRepoRoot(repoRoot),
+	mWrapperPath(wrapperPath),
+	mGeneratedGlslPath(generatedGlslPath),
+	mPatchedGlslPath(patchedGlslPath),
+	mMaxTemporalHistoryFrames(maxTemporalHistoryFrames)
+{
+}
+
+bool ShaderCompiler::BuildPassFragmentShaderSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& fragmentShaderSource, std::string& error) const
+{
+	std::string wrapperSource;
+	if (!BuildWrapperSlangSource(shaderPackage, pass, wrapperSource, error))
+		return false;
+	if (!WriteTextFile(mWrapperPath, wrapperSource, error))
+		return false;
+
+	if (!RunSlangCompiler(mWrapperPath, mGeneratedGlslPath, error))
+		return false;
+
+	fragmentShaderSource = ReadTextFile(mGeneratedGlslPath, error);
+	if (fragmentShaderSource.empty())
+		return false;
+
+	if (!PatchGeneratedGlsl(fragmentShaderSource, error))
+		return false;
+
+	if (!WriteTextFile(mPatchedGlslPath, fragmentShaderSource, error))
+		return false;
+
+	return true;
+}
+
+bool ShaderCompiler::BuildWrapperSlangSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& wrapperSource, std::string& error) const
+{
+	const std::filesystem::path templatePath = mRepoRoot / "runtime" / "templates" / "shader_wrapper.slang.in";
+	wrapperSource = ReadTextFile(templatePath, error);
+	if (wrapperSource.empty())
+		return false;
+
+	wrapperSource = ReplaceAll(wrapperSource, "{{PARAMETER_UNIFORMS}}", BuildParameterUniforms(shaderPackage.parameters));
+	const unsigned historySamplerCount = shaderPackage.temporal.enabled ? mMaxTemporalHistoryFrames : 0;
+	wrapperSource = ReplaceAll(wrapperSource, "{{SOURCE_HISTORY_SAMPLERS}}", BuildHistorySamplerDeclarations("gSourceHistory", historySamplerCount));
+	wrapperSource = ReplaceAll(wrapperSource, "{{TEMPORAL_HISTORY_SAMPLERS}}", BuildHistorySamplerDeclarations("gTemporalHistory", historySamplerCount));
+	wrapperSource = ReplaceAll(wrapperSource, "{{FEEDBACK_SAMPLER}}", shaderPackage.feedback.enabled ? "Sampler2D<float4> gFeedbackState;\n" : "");
+	wrapperSource = ReplaceAll(wrapperSource, "{{FEEDBACK_HELPER}}",
+		shaderPackage.feedback.enabled
+			? "float4 sampleFeedback(float2 tc)\n{\n\tif (gFeedbackAvailable <= 0)\n\t\treturn float4(0.0, 0.0, 0.0, 0.0);\n\treturn gFeedbackState.Sample(tc);\n}\n"
+			: "float4 sampleFeedback(float2 tc)\n{\n\treturn float4(0.0, 0.0, 0.0, 0.0);\n}\n");
+	wrapperSource = ReplaceAll(wrapperSource, "{{TEXTURE_SAMPLERS}}", BuildTextureSamplerDeclarations(shaderPackage.textureAssets));
+	wrapperSource = ReplaceAll(wrapperSource, "{{TEXT_SAMPLERS}}", BuildTextSamplerDeclarations(shaderPackage.parameters));
+	wrapperSource = ReplaceAll(wrapperSource, "{{TEXT_HELPERS}}", BuildTextHelpers(shaderPackage.parameters));
+	wrapperSource = ReplaceAll(wrapperSource, "{{SOURCE_HISTORY_SWITCH_CASES}}", BuildHistorySwitchCases("gSourceHistory", historySamplerCount));
+	wrapperSource = ReplaceAll(wrapperSource, "{{TEMPORAL_HISTORY_SWITCH_CASES}}", BuildHistorySwitchCases("gTemporalHistory", historySamplerCount));
+	wrapperSource = ReplaceAll(wrapperSource, "{{USER_SHADER_INCLUDE}}", pass.sourcePath.generic_string());
+	wrapperSource = ReplaceAll(wrapperSource, "{{ENTRY_POINT_CALL}}", pass.entryPoint + "(context)");
+	return true;
+}
+
+bool ShaderCompiler::FindSlangCompiler(std::filesystem::path& compilerPath, std::string& error) const
+{
+	char slangRootBuffer[MAX_PATH] = {};
+	const DWORD slangRootLength = GetEnvironmentVariableA("SLANG_ROOT", slangRootBuffer, static_cast<DWORD>(sizeof(slangRootBuffer)));
+	if (slangRootLength > 0 && slangRootLength < sizeof(slangRootBuffer))
+	{
+		std::filesystem::path candidate = std::filesystem::path(slangRootBuffer) / "bin" / "slangc.exe";
+		if (std::filesystem::exists(candidate))
+		{
+			compilerPath = candidate;
+			return true;
+		}
+	}
+
+	std::filesystem::path thirdPartyRoot = mRepoRoot / "3rdParty";
+	if (!std::filesystem::exists(thirdPartyRoot))
+	{
+		error = "3rdParty directory was not found under the repository root.";
+		return false;
+	}
+
+	for (const auto& entry : std::filesystem::directory_iterator(thirdPartyRoot))
+	{
+		if (!entry.is_directory())
+			continue;
+		std::filesystem::path candidate = entry.path() / "bin" / "slangc.exe";
+		if (std::filesystem::exists(candidate))
+		{
+			compilerPath = candidate;
+			return true;
+		}
+	}
+
+	error = "Could not find slangc.exe under 3rdParty.";
+	return false;
+}
+
+bool ShaderCompiler::RunSlangCompiler(const std::filesystem::path& wrapperPath, const std::filesystem::path& outputPath, std::string& error) const
+{
+	std::filesystem::path compilerPath;
+	if (!FindSlangCompiler(compilerPath, error))
+		return false;
+
+	std::string commandLine = "\"" + compilerPath.string() + "\" \"" + wrapperPath.string()
+		+ "\" -target glsl -profile glsl_430 -entry fragmentMain -stage fragment -o \"" + outputPath.string() + "\"";
+
+	STARTUPINFOA startupInfo = {};
+	PROCESS_INFORMATION processInfo = {};
+	startupInfo.cb = sizeof(startupInfo);
+	std::vector<char> mutableCommandLine(commandLine.begin(), commandLine.end());
+	mutableCommandLine.push_back('\0');
+
+	if (!CreateProcessA(NULL, mutableCommandLine.data(), NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, mRepoRoot.string().c_str(), &startupInfo, &processInfo))
+	{
+		error = "Failed to launch slangc.exe.";
+		return false;
+	}
+
+	UniqueHandle processHandle(processInfo.hProcess);
+	UniqueHandle threadHandle(processInfo.hThread);
+
+	WaitForSingleObject(processHandle.get(), INFINITE);
+
+	DWORD exitCode = 0;
+	GetExitCodeProcess(processHandle.get(), &exitCode);
+
+	if (exitCode != 0)
+	{
+		error = "slangc.exe returned a non-zero exit code while compiling the active shader package.";
+		return false;
+	}
+
+	return true;
+}
+
+bool ShaderCompiler::PatchGeneratedGlsl(std::string& shaderText, std::string& error) const
+{
+	if (shaderText.find("#version 450") == std::string::npos)
+	{
+		error = "Generated GLSL did not include the expected version header.";
+		return false;
+	}
+
+	shaderText = ReplaceAll(shaderText, "#version 450", "#version 430 core");
+	shaderText = std::regex_replace(shaderText, std::regex(R"(#extension GL_EXT_samplerless_texture_functions : require\r?\n)"), "");
+	shaderText = std::regex_replace(shaderText, std::regex(R"(layout\(row_major\) uniform;\r?\n)"), "");
+	shaderText = std::regex_replace(shaderText, std::regex(R"(layout\(row_major\) buffer;\r?\n)"), "");
+	shaderText = std::regex_replace(shaderText, std::regex(R"(layout\(location = 0\)\s*in vec2 ([A-Za-z0-9_]+);)"), "in vec2 vTexCoord;");
+	shaderText = ReplaceAll(shaderText, "input_texCoord_0", "vTexCoord");
+
+	std::smatch match;
+	std::regex outRegex(R"(layout\(location = 0\)\s*out vec4 ([A-Za-z0-9_]+);)");
+	if (std::regex_search(shaderText, match, outRegex))
+	{
+		const std::string outputName = match[1].str();
+		shaderText = std::regex_replace(shaderText, outRegex, "layout(location = 0) out vec4 fragColor;");
+		shaderText = ReplaceAll(shaderText, outputName + " =", "fragColor =");
+	}
+
+	return true;
+}
+
+std::string ShaderCompiler::ReadTextFile(const std::filesystem::path& path, std::string& error) const
+{
+	std::ifstream input(path, std::ios::binary);
+	if (!input)
+	{
+		error = "Could not open file: " + path.string();
+		return std::string();
+	}
+
+	std::ostringstream buffer;
+	buffer << input.rdbuf();
+	return buffer.str();
+}
+
+bool ShaderCompiler::WriteTextFile(const std::filesystem::path& path, const std::string& contents, std::string& error) const
+{
+	std::error_code fsError;
+	std::filesystem::create_directories(path.parent_path(), fsError);
+
+	std::ofstream output(path, std::ios::binary);
+	if (!output)
+	{
+		error = "Could not write file: " + path.string();
+		return false;
+	}
+
+	output << contents;
+	return output.good();
+}

src/shader/ShaderCompiler.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "ShaderTypes.h"
+
+#include <filesystem>
+#include <string>
+
+class ShaderCompiler
+{
+public:
+	ShaderCompiler(
+		const std::filesystem::path& repoRoot,
+		const std::filesystem::path& wrapperPath,
+		const std::filesystem::path& generatedGlslPath,
+		const std::filesystem::path& patchedGlslPath,
+		unsigned maxTemporalHistoryFrames);
+
+	bool BuildPassFragmentShaderSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& fragmentShaderSource, std::string& error) const;
+
+private:
+	bool BuildWrapperSlangSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& wrapperSource, std::string& error) const;
+	bool FindSlangCompiler(std::filesystem::path& compilerPath, std::string& error) const;
+	bool RunSlangCompiler(const std::filesystem::path& wrapperPath, const std::filesystem::path& outputPath, std::string& error) const;
+	bool PatchGeneratedGlsl(std::string& shaderText, std::string& error) const;
+	std::string ReadTextFile(const std::filesystem::path& path, std::string& error) const;
+	bool WriteTextFile(const std::filesystem::path& path, const std::string& contents, std::string& error) const;
+
+private:
+	std::filesystem::path mRepoRoot;
+	std::filesystem::path mWrapperPath;
+	std::filesystem::path mGeneratedGlslPath;
+	std::filesystem::path mPatchedGlslPath;
+	unsigned mMaxTemporalHistoryFrames;
+};

src/shader/ShaderPackageRegistry.cpp

@@ -0,0 +1,818 @@
+#include "stdafx.h"
+#include "ShaderPackageRegistry.h"
+
+#include "RuntimeJson.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cctype>
+#include <fstream>
+#include <sstream>
+
+namespace
+{
+std::string Trim(const std::string& text)
+{
+	std::size_t start = 0;
+	while (start < text.size() && std::isspace(static_cast<unsigned char>(text[start])))
+		++start;
+
+	std::size_t end = text.size();
+	while (end > start && std::isspace(static_cast<unsigned char>(text[end - 1])))
+		--end;
+
+	return text.substr(start, end - start);
+}
+
+bool IsFiniteNumber(double value)
+{
+	return std::isfinite(value) != 0;
+}
+
+bool ParseShaderParameterType(const std::string& typeName, ShaderParameterType& type)
+{
+	if (typeName == "float")
+	{
+		type = ShaderParameterType::Float;
+		return true;
+	}
+	if (typeName == "vec2")
+	{
+		type = ShaderParameterType::Vec2;
+		return true;
+	}
+	if (typeName == "color")
+	{
+		type = ShaderParameterType::Color;
+		return true;
+	}
+	if (typeName == "bool")
+	{
+		type = ShaderParameterType::Boolean;
+		return true;
+	}
+	if (typeName == "enum")
+	{
+		type = ShaderParameterType::Enum;
+		return true;
+	}
+	if (typeName == "text")
+	{
+		type = ShaderParameterType::Text;
+		return true;
+	}
+	if (typeName == "trigger")
+	{
+		type = ShaderParameterType::Trigger;
+		return true;
+	}
+	return false;
+}
+
+bool ParseTemporalHistorySource(const std::string& sourceName, TemporalHistorySource& source)
+{
+	if (sourceName == "source")
+	{
+		source = TemporalHistorySource::Source;
+		return true;
+	}
+	if (sourceName == "preLayerInput")
+	{
+		source = TemporalHistorySource::PreLayerInput;
+		return true;
+	}
+	if (sourceName == "none")
+	{
+		source = TemporalHistorySource::None;
+		return true;
+	}
+	return false;
+}
+
+std::string ReadTextFile(const std::filesystem::path& path, std::string& error)
+{
+	std::ifstream input(path, std::ios::binary);
+	if (!input)
+	{
+		error = "Could not open file: " + path.string();
+		return std::string();
+	}
+
+	std::ostringstream buffer;
+	buffer << input.rdbuf();
+	return buffer.str();
+}
+
+std::string ManifestPathMessage(const std::filesystem::path& manifestPath)
+{
+	return manifestPath.string();
+}
+
+bool RequireStringField(const JsonValue& object, const char* fieldName, std::string& value, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* fieldValue = object.find(fieldName);
+	if (!fieldValue || !fieldValue->isString())
+	{
+		error = "Shader manifest is missing required string '" + std::string(fieldName) + "' field: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	value = fieldValue->asString();
+	return true;
+}
+
+bool RequireNonEmptyStringField(const JsonValue& object, const char* fieldName, std::string& value, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (!RequireStringField(object, fieldName, value, manifestPath, error))
+		return false;
+	if (Trim(value).empty())
+	{
+		error = "Shader manifest string '" + std::string(fieldName) + "' must not be empty: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+	return true;
+}
+
+bool OptionalStringField(const JsonValue& object, const char* fieldName, std::string& value, const std::string& fallback, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* fieldValue = object.find(fieldName);
+	if (!fieldValue)
+	{
+		value = fallback;
+		return true;
+	}
+	if (!fieldValue->isString())
+	{
+		error = "Shader manifest field '" + std::string(fieldName) + "' must be a string in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+	value = fieldValue->asString();
+	return true;
+}
+
+bool OptionalArrayField(const JsonValue& object, const char* fieldName, const JsonValue*& value, const std::filesystem::path& manifestPath, std::string& error)
+{
+	value = object.find(fieldName);
+	if (!value)
+		return true;
+	if (!value->isArray())
+	{
+		error = "Shader manifest '" + std::string(fieldName) + "' field must be an array in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+	return true;
+}
+
+bool OptionalObjectField(const JsonValue& object, const char* fieldName, const JsonValue*& value, const std::filesystem::path& manifestPath, std::string& error)
+{
+	value = object.find(fieldName);
+	if (!value)
+		return true;
+	if (!value->isObject())
+	{
+		error = "Shader manifest '" + std::string(fieldName) + "' field must be an object in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+	return true;
+}
+
+bool NumberListFromJsonValue(const JsonValue& value, std::vector<double>& numbers, const std::string& fieldName, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (value.isNumber())
+	{
+		numbers.push_back(value.asNumber());
+		return true;
+	}
+	if (value.isArray())
+	{
+		numbers = JsonArrayToNumbers(value);
+		if (numbers.size() != value.asArray().size())
+		{
+			error = "Shader parameter field '" + fieldName + "' must contain only numbers in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		return true;
+	}
+
+	error = "Shader parameter field '" + fieldName + "' must be a number or array of numbers in: " + ManifestPathMessage(manifestPath);
+	return false;
+}
+
+bool ValidateShaderIdentifier(const std::string& identifier, const std::string& fieldName, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (identifier.empty() || !(std::isalpha(static_cast<unsigned char>(identifier.front())) || identifier.front() == '_'))
+	{
+		error = "Shader manifest field '" + fieldName + "' must be a valid shader identifier in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	for (char ch : identifier)
+	{
+		const unsigned char unsignedCh = static_cast<unsigned char>(ch);
+		if (!(std::isalnum(unsignedCh) || ch == '_'))
+		{
+			error = "Shader manifest field '" + fieldName + "' must be a valid shader identifier in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+bool ParseShaderMetadata(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (!RequireStringField(manifestJson, "id", shaderPackage.id, manifestPath, error) ||
+		!RequireStringField(manifestJson, "name", shaderPackage.displayName, manifestPath, error) ||
+		!OptionalStringField(manifestJson, "description", shaderPackage.description, "", manifestPath, error) ||
+		!OptionalStringField(manifestJson, "category", shaderPackage.category, "", manifestPath, error) ||
+		!OptionalStringField(manifestJson, "entryPoint", shaderPackage.entryPoint, "shadeVideo", manifestPath, error))
+	{
+		return false;
+	}
+
+	if (!ValidateShaderIdentifier(shaderPackage.entryPoint, "entryPoint", manifestPath, error))
+		return false;
+
+	shaderPackage.directoryPath = manifestPath.parent_path();
+	shaderPackage.shaderPath = shaderPackage.directoryPath / "shader.slang";
+	shaderPackage.manifestPath = manifestPath;
+	return true;
+}
+
+bool ParsePassDefinitions(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* passesValue = nullptr;
+	if (!OptionalArrayField(manifestJson, "passes", passesValue, manifestPath, error))
+		return false;
+
+	if (!passesValue)
+	{
+		// Existing shader packages are treated as a single implicit pass, so
+		// multipass support does not require manifest churn.
+		ShaderPassDefinition pass;
+		pass.id = "main";
+		pass.entryPoint = shaderPackage.entryPoint;
+		pass.sourcePath = shaderPackage.shaderPath;
+		pass.outputName = "layerOutput";
+		if (!std::filesystem::exists(pass.sourcePath))
+		{
+			error = "Shader source not found for package " + shaderPackage.id + ": " + pass.sourcePath.string();
+			return false;
+		}
+		pass.sourceWriteTime = std::filesystem::last_write_time(pass.sourcePath);
+		shaderPackage.passes.push_back(pass);
+		return true;
+	}
+
+	if (passesValue->asArray().empty())
+	{
+		error = "Shader manifest 'passes' field must not be empty in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	for (const JsonValue& passJson : passesValue->asArray())
+	{
+		if (!passJson.isObject())
+		{
+			error = "Shader pass entry must be an object in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+
+		std::string passId;
+		std::string sourcePath;
+		if (!RequireNonEmptyStringField(passJson, "id", passId, manifestPath, error) ||
+			!RequireNonEmptyStringField(passJson, "source", sourcePath, manifestPath, error))
+		{
+			error = "Shader pass is missing required 'id' or 'source' in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		if (!ValidateShaderIdentifier(passId, "passes[].id", manifestPath, error))
+			return false;
+
+		for (const ShaderPassDefinition& existingPass : shaderPackage.passes)
+		{
+			if (existingPass.id == passId)
+			{
+				error = "Duplicate shader pass id '" + passId + "' in: " + ManifestPathMessage(manifestPath);
+				return false;
+			}
+		}
+
+		ShaderPassDefinition pass;
+		pass.id = passId;
+		pass.sourcePath = shaderPackage.directoryPath / sourcePath;
+		if (!OptionalStringField(passJson, "entryPoint", pass.entryPoint, shaderPackage.entryPoint, manifestPath, error) ||
+			!OptionalStringField(passJson, "output", pass.outputName, passId, manifestPath, error))
+		{
+			return false;
+		}
+		if (!ValidateShaderIdentifier(pass.entryPoint, "passes[].entryPoint", manifestPath, error))
+			return false;
+
+		const JsonValue* inputsValue = nullptr;
+		if (!OptionalArrayField(passJson, "inputs", inputsValue, manifestPath, error))
+			return false;
+		if (inputsValue)
+		{
+			for (const JsonValue& inputValue : inputsValue->asArray())
+			{
+				if (!inputValue.isString())
+				{
+					error = "Shader pass inputs must be strings in: " + ManifestPathMessage(manifestPath);
+					return false;
+				}
+				pass.inputNames.push_back(inputValue.asString());
+			}
+		}
+
+		// Keep source validation in the registry. Bad pass declarations then
+		// appear as unavailable shaders instead of failing at render time.
+		if (!std::filesystem::exists(pass.sourcePath))
+		{
+			error = "Shader pass source not found for package " + shaderPackage.id + ": " + pass.sourcePath.string();
+			return false;
+		}
+		pass.sourceWriteTime = std::filesystem::last_write_time(pass.sourcePath);
+		shaderPackage.passes.push_back(pass);
+	}
+
+	shaderPackage.shaderPath = shaderPackage.passes.front().sourcePath;
+	return true;
+}
+
+bool ParseTextureAssets(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* texturesValue = nullptr;
+	if (!OptionalArrayField(manifestJson, "textures", texturesValue, manifestPath, error))
+		return false;
+	if (!texturesValue)
+		return true;
+
+	for (const JsonValue& textureJson : texturesValue->asArray())
+	{
+		if (!textureJson.isObject())
+		{
+			error = "Shader texture entry must be an object in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+
+		std::string textureId;
+		std::string texturePath;
+		if (!RequireNonEmptyStringField(textureJson, "id", textureId, manifestPath, error) ||
+			!RequireNonEmptyStringField(textureJson, "path", texturePath, manifestPath, error))
+		{
+			error = "Shader texture is missing required 'id' or 'path' in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		if (!ValidateShaderIdentifier(textureId, "textures[].id", manifestPath, error))
+			return false;
+
+		ShaderTextureAsset textureAsset;
+		textureAsset.id = textureId;
+		textureAsset.path = shaderPackage.directoryPath / texturePath;
+		if (!std::filesystem::exists(textureAsset.path))
+		{
+			error = "Shader texture asset not found for package " + shaderPackage.id + ": " + textureAsset.path.string();
+			return false;
+		}
+
+		textureAsset.writeTime = std::filesystem::last_write_time(textureAsset.path);
+		shaderPackage.textureAssets.push_back(textureAsset);
+	}
+
+	return true;
+}
+
+bool ParseFontAssets(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* fontsValue = nullptr;
+	if (!OptionalArrayField(manifestJson, "fonts", fontsValue, manifestPath, error))
+		return false;
+	if (!fontsValue)
+		return true;
+
+	for (const JsonValue& fontJson : fontsValue->asArray())
+	{
+		if (!fontJson.isObject())
+		{
+			error = "Shader font entry must be an object in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+
+		std::string fontId;
+		std::string fontPath;
+		if (!RequireNonEmptyStringField(fontJson, "id", fontId, manifestPath, error) ||
+			!RequireNonEmptyStringField(fontJson, "path", fontPath, manifestPath, error))
+		{
+			error = "Shader font is missing required 'id' or 'path' in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		if (!ValidateShaderIdentifier(fontId, "fonts[].id", manifestPath, error))
+			return false;
+
+		ShaderFontAsset fontAsset;
+		fontAsset.id = fontId;
+		fontAsset.path = shaderPackage.directoryPath / fontPath;
+		if (!std::filesystem::exists(fontAsset.path))
+		{
+			error = "Shader font asset not found for package " + shaderPackage.id + ": " + fontAsset.path.string();
+			return false;
+		}
+
+		fontAsset.writeTime = std::filesystem::last_write_time(fontAsset.path);
+		shaderPackage.fontAssets.push_back(fontAsset);
+	}
+
+	return true;
+}
+
+bool ParseTemporalSettings(const JsonValue& manifestJson, ShaderPackage& shaderPackage, unsigned maxTemporalHistoryFrames, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* temporalValue = nullptr;
+	if (!OptionalObjectField(manifestJson, "temporal", temporalValue, manifestPath, error))
+		return false;
+	if (!temporalValue)
+		return true;
+
+	const JsonValue* enabledValue = temporalValue->find("enabled");
+	if (!enabledValue || !enabledValue->asBoolean(false))
+		return true;
+
+	std::string historySourceName;
+	if (!RequireNonEmptyStringField(*temporalValue, "historySource", historySourceName, manifestPath, error))
+	{
+		error = "Temporal shader is missing required 'historySource' in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	const JsonValue* historyLengthValue = temporalValue->find("historyLength");
+	if (!historyLengthValue || !historyLengthValue->isNumber())
+	{
+		error = "Temporal shader is missing required numeric 'historyLength' in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	TemporalHistorySource historySource = TemporalHistorySource::None;
+	if (!ParseTemporalHistorySource(historySourceName, historySource))
+	{
+		error = "Unsupported temporal historySource '" + historySourceName + "' in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	const double requestedHistoryLength = historyLengthValue->asNumber();
+	if (!IsFiniteNumber(requestedHistoryLength) || requestedHistoryLength <= 0.0 || std::floor(requestedHistoryLength) != requestedHistoryLength)
+	{
+		error = "Temporal shader 'historyLength' must be a positive integer in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	shaderPackage.temporal.enabled = true;
+	shaderPackage.temporal.historySource = historySource;
+	shaderPackage.temporal.requestedHistoryLength = static_cast<unsigned>(requestedHistoryLength);
+	shaderPackage.temporal.effectiveHistoryLength = std::min(shaderPackage.temporal.requestedHistoryLength, maxTemporalHistoryFrames);
+	return true;
+}
+
+bool ParseFeedbackSettings(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* feedbackValue = nullptr;
+	if (!OptionalObjectField(manifestJson, "feedback", feedbackValue, manifestPath, error))
+		return false;
+	if (!feedbackValue)
+		return true;
+
+	const JsonValue* enabledValue = feedbackValue->find("enabled");
+	if (!enabledValue || !enabledValue->asBoolean(false))
+		return true;
+
+	shaderPackage.feedback.enabled = true;
+	if (!OptionalStringField(*feedbackValue, "writePass", shaderPackage.feedback.writePassId, "", manifestPath, error))
+		return false;
+
+	if (shaderPackage.feedback.writePassId.empty())
+	{
+		if (shaderPackage.passes.empty())
+		{
+			error = "Feedback-enabled shader has no passes to target in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		shaderPackage.feedback.writePassId = shaderPackage.passes.back().id;
+	}
+
+	if (!ValidateShaderIdentifier(shaderPackage.feedback.writePassId, "feedback.writePass", manifestPath, error))
+		return false;
+
+	const auto passIt = std::find_if(shaderPackage.passes.begin(), shaderPackage.passes.end(),
+		[&shaderPackage](const ShaderPassDefinition& pass) { return pass.id == shaderPackage.feedback.writePassId; });
+	if (passIt == shaderPackage.passes.end())
+	{
+		error = "Feedback writePass '" + shaderPackage.feedback.writePassId + "' does not match any declared pass in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	return true;
+}
+
+bool ParseParameterNumberField(const JsonValue& parameterJson, const char* fieldName, std::vector<double>& values, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (const JsonValue* fieldValue = parameterJson.find(fieldName))
+		return NumberListFromJsonValue(*fieldValue, values, fieldName, manifestPath, error);
+	return true;
+}
+
+bool ParseParameterDefault(const JsonValue& parameterJson, ShaderParameterDefinition& definition, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* defaultValue = parameterJson.find("default");
+	if (!defaultValue)
+		return true;
+
+	if (definition.type == ShaderParameterType::Boolean)
+	{
+		if (!defaultValue->isBoolean())
+		{
+			error = "Boolean parameter default must be a boolean for: " + definition.id;
+			return false;
+		}
+		definition.defaultBoolean = defaultValue->asBoolean(false);
+		return true;
+	}
+
+	if (definition.type == ShaderParameterType::Enum)
+	{
+		if (!defaultValue->isString())
+		{
+			error = "Enum parameter default must be a string for: " + definition.id;
+			return false;
+		}
+		definition.defaultEnumValue = defaultValue->asString();
+		return true;
+	}
+
+	if (definition.type == ShaderParameterType::Text)
+	{
+		if (!defaultValue->isString())
+		{
+			error = "Text parameter default must be a string for: " + definition.id;
+			return false;
+		}
+		definition.defaultTextValue = defaultValue->asString();
+		return true;
+	}
+
+	return NumberListFromJsonValue(*defaultValue, definition.defaultNumbers, "default", manifestPath, error);
+}
+
+bool ParseParameterOptions(const JsonValue& parameterJson, ShaderParameterDefinition& definition, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* optionsValue = nullptr;
+	if (!OptionalArrayField(parameterJson, "options", optionsValue, manifestPath, error) || !optionsValue)
+	{
+		error = "Enum parameter is missing 'options' in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	for (const JsonValue& optionJson : optionsValue->asArray())
+	{
+		if (!optionJson.isObject())
+		{
+			error = "Enum parameter option must be an object in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+
+		ShaderParameterOption option;
+		if (!RequireStringField(optionJson, "value", option.value, manifestPath, error) ||
+			!RequireStringField(optionJson, "label", option.label, manifestPath, error))
+		{
+			error = "Enum parameter option is missing 'value' or 'label' in: " + ManifestPathMessage(manifestPath);
+			return false;
+		}
+		definition.enumOptions.push_back(option);
+	}
+
+	bool defaultFound = definition.defaultEnumValue.empty();
+	for (const ShaderParameterOption& option : definition.enumOptions)
+	{
+		if (option.value == definition.defaultEnumValue)
+		{
+			defaultFound = true;
+			break;
+		}
+	}
+
+	if (!defaultFound)
+	{
+		error = "Enum parameter default is not present in its option list for: " + definition.id;
+		return false;
+	}
+
+	return true;
+}
+
+bool ParseParameterDefinition(const JsonValue& parameterJson, ShaderParameterDefinition& definition, const std::filesystem::path& manifestPath, std::string& error)
+{
+	if (!parameterJson.isObject())
+	{
+		error = "Shader parameter entry must be an object in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	std::string typeName;
+	if (!RequireStringField(parameterJson, "id", definition.id, manifestPath, error) ||
+		!RequireStringField(parameterJson, "label", definition.label, manifestPath, error) ||
+		!RequireStringField(parameterJson, "type", typeName, manifestPath, error))
+	{
+		error = "Shader parameter is missing required fields in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+
+	if (!ParseShaderParameterType(typeName, definition.type))
+	{
+		error = "Unsupported parameter type '" + typeName + "' in: " + ManifestPathMessage(manifestPath);
+		return false;
+	}
+	if (!ValidateShaderIdentifier(definition.id, "parameters[].id", manifestPath, error))
+		return false;
+
+	if (!OptionalStringField(parameterJson, "description", definition.description, "", manifestPath, error))
+		return false;
+
+	if (!ParseParameterDefault(parameterJson, definition, manifestPath, error) ||
+		!ParseParameterNumberField(parameterJson, "min", definition.minNumbers, manifestPath, error) ||
+		!ParseParameterNumberField(parameterJson, "max", definition.maxNumbers, manifestPath, error) ||
+		!ParseParameterNumberField(parameterJson, "step", definition.stepNumbers, manifestPath, error))
+	{
+		return false;
+	}
+
+	if (definition.type == ShaderParameterType::Text)
+	{
+		if (const JsonValue* fontValue = parameterJson.find("font"))
+		{
+			if (!fontValue->isString())
+			{
+				error = "Text parameter 'font' must be a string for: " + definition.id;
+				return false;
+			}
+			definition.fontId = fontValue->asString();
+			if (!definition.fontId.empty() && !ValidateShaderIdentifier(definition.fontId, "parameters[].font", manifestPath, error))
+				return false;
+		}
+		if (const JsonValue* maxLengthValue = parameterJson.find("maxLength"))
+		{
+			if (!maxLengthValue->isNumber() || maxLengthValue->asNumber() < 1.0 || maxLengthValue->asNumber() > 256.0)
+			{
+				error = "Text parameter 'maxLength' must be a number from 1 to 256 for: " + definition.id;
+				return false;
+			}
+			definition.maxLength = static_cast<unsigned>(maxLengthValue->asNumber());
+		}
+	}
+
+	if (definition.type == ShaderParameterType::Enum)
+		return ParseParameterOptions(parameterJson, definition, manifestPath, error);
+
+	return true;
+}
+
+bool ParseParameterDefinitions(const JsonValue& manifestJson, ShaderPackage& shaderPackage, const std::filesystem::path& manifestPath, std::string& error)
+{
+	const JsonValue* parametersValue = nullptr;
+	if (!OptionalArrayField(manifestJson, "parameters", parametersValue, manifestPath, error))
+		return false;
+	if (!parametersValue)
+		return true;
+
+	for (const JsonValue& parameterJson : parametersValue->asArray())
+	{
+		ShaderParameterDefinition definition;
+		if (!ParseParameterDefinition(parameterJson, definition, manifestPath, error))
+			return false;
+		shaderPackage.parameters.push_back(definition);
+	}
+
+	return true;
+}
+
+std::string UniqueUnavailableShaderId(const std::filesystem::path& manifestPath, const std::string& parsedId)
+{
+	const std::string fallbackId = manifestPath.parent_path().filename().string();
+	const std::string baseId = parsedId.empty() ? fallbackId : parsedId;
+	return baseId + "@invalid:" + fallbackId;
+}
+
+ShaderPackageStatus BuildUnavailableStatus(const std::filesystem::path& manifestPath, const ShaderPackage& partialPackage, const std::string& packageError)
+{
+	ShaderPackageStatus status;
+	status.id = UniqueUnavailableShaderId(manifestPath, partialPackage.id);
+	status.displayName = !partialPackage.displayName.empty() ? partialPackage.displayName : manifestPath.parent_path().filename().string();
+	status.description = partialPackage.description;
+	status.category = !partialPackage.category.empty() ? partialPackage.category : "Unavailable";
+	status.available = false;
+	status.error = packageError;
+	return status;
+}
+
+ShaderPackageStatus BuildAvailableStatus(const ShaderPackage& shaderPackage)
+{
+	ShaderPackageStatus status;
+	status.id = shaderPackage.id;
+	status.displayName = shaderPackage.displayName;
+	status.description = shaderPackage.description;
+	status.category = shaderPackage.category;
+	status.available = true;
+	return status;
+}
+}
+
+ShaderPackageRegistry::ShaderPackageRegistry(unsigned maxTemporalHistoryFrames)
+	: mMaxTemporalHistoryFrames(maxTemporalHistoryFrames)
+{
+}
+
+bool ShaderPackageRegistry::Scan(
+	const std::filesystem::path& shaderRoot,
+	std::map<std::string, ShaderPackage>& packagesById,
+	std::vector<std::string>& packageOrder,
+	std::vector<ShaderPackageStatus>& packageStatuses,
+	std::string& error) const
+{
+	packagesById.clear();
+	packageOrder.clear();
+	packageStatuses.clear();
+
+	if (!std::filesystem::exists(shaderRoot))
+	{
+		error = "Shader library directory does not exist: " + shaderRoot.string();
+		return false;
+	}
+
+	for (const auto& entry : std::filesystem::directory_iterator(shaderRoot))
+	{
+		if (!entry.is_directory())
+			continue;
+
+		std::filesystem::path manifestPath = entry.path() / "shader.json";
+		if (!std::filesystem::exists(manifestPath))
+			continue;
+
+		ShaderPackage shaderPackage;
+		if (!ParseManifest(manifestPath, shaderPackage, error))
+		{
+			packageStatuses.push_back(BuildUnavailableStatus(manifestPath, shaderPackage, error));
+			error.clear();
+			continue;
+		}
+
+		if (packagesById.find(shaderPackage.id) != packagesById.end())
+		{
+			packageStatuses.push_back(BuildUnavailableStatus(manifestPath, shaderPackage, "Duplicate shader id found: " + shaderPackage.id));
+			continue;
+		}
+
+		packageOrder.push_back(shaderPackage.id);
+		packageStatuses.push_back(BuildAvailableStatus(shaderPackage));
+		packagesById[shaderPackage.id] = shaderPackage;
+	}
+
+	std::sort(packageOrder.begin(), packageOrder.end());
+	std::sort(packageStatuses.begin(), packageStatuses.end(), [](const ShaderPackageStatus& left, const ShaderPackageStatus& right) {
+		return left.displayName < right.displayName;
+	});
+	return true;
+}
+
+bool ShaderPackageRegistry::ParseManifest(const std::filesystem::path& manifestPath, ShaderPackage& shaderPackage, std::string& error) const
+{
+	const std::string manifestText = ReadTextFile(manifestPath, error);
+	if (manifestText.empty())
+		return false;
+
+	JsonValue manifestJson;
+	if (!ParseJson(manifestText, manifestJson, error))
+		return false;
+	if (!manifestJson.isObject())
+	{
+		error = "Shader manifest root must be an object: " + manifestPath.string();
+		return false;
+	}
+
+	if (!ParseShaderMetadata(manifestJson, shaderPackage, manifestPath, error))
+		return false;
+
+	if (!ParsePassDefinitions(manifestJson, shaderPackage, manifestPath, error))
+		return false;
+
+	shaderPackage.shaderWriteTime = shaderPackage.passes.front().sourceWriteTime;
+	for (const ShaderPassDefinition& pass : shaderPackage.passes)
+	{
+		if (pass.sourceWriteTime > shaderPackage.shaderWriteTime)
+			shaderPackage.shaderWriteTime = pass.sourceWriteTime;
+	}
+	shaderPackage.manifestWriteTime = std::filesystem::last_write_time(shaderPackage.manifestPath);
+
+	return ParseTextureAssets(manifestJson, shaderPackage, manifestPath, error) &&
+		ParseFontAssets(manifestJson, shaderPackage, manifestPath, error) &&
+		ParseTemporalSettings(manifestJson, shaderPackage, mMaxTemporalHistoryFrames, manifestPath, error) &&
+		ParseFeedbackSettings(manifestJson, shaderPackage, manifestPath, error) &&
+		ParseParameterDefinitions(manifestJson, shaderPackage, manifestPath, error);
+}

src/shader/ShaderPackageRegistry.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "ShaderTypes.h"
+
+#include <filesystem>
+#include <map>
+#include <string>
+#include <vector>
+
+class ShaderPackageRegistry
+{
+public:
+	explicit ShaderPackageRegistry(unsigned maxTemporalHistoryFrames);
+
+	bool Scan(
+		const std::filesystem::path& shaderRoot,
+		std::map<std::string, ShaderPackage>& packagesById,
+		std::vector<std::string>& packageOrder,
+		std::vector<ShaderPackageStatus>& packageStatuses,
+		std::string& error) const;
+	bool ParseManifest(const std::filesystem::path& manifestPath, ShaderPackage& shaderPackage, std::string& error) const;
+
+private:
+	unsigned mMaxTemporalHistoryFrames;
+};

src/shader/ShaderTypes.h

@@ -0,0 +1,159 @@
+#pragma once
+
+#include <filesystem>
+#include <map>
+#include <string>
+#include <vector>
+
+enum class ShaderParameterType
+{
+	Float,
+	Vec2,
+	Color,
+	Boolean,
+	Enum,
+	Text,
+	Trigger
+};
+
+struct ShaderParameterOption
+{
+	std::string value;
+	std::string label;
+};
+
+struct ShaderParameterDefinition
+{
+	std::string id;
+	std::string label;
+	std::string description;
+	ShaderParameterType type = ShaderParameterType::Float;
+	std::vector<double> defaultNumbers;
+	std::vector<double> minNumbers;
+	std::vector<double> maxNumbers;
+	std::vector<double> stepNumbers;
+	bool defaultBoolean = false;
+	std::string defaultEnumValue;
+	std::string defaultTextValue;
+	std::string fontId;
+	unsigned maxLength = 64;
+	std::vector<ShaderParameterOption> enumOptions;
+};
+
+struct ShaderParameterValue
+{
+	std::vector<double> numberValues;
+	bool booleanValue = false;
+	std::string enumValue;
+	std::string textValue;
+};
+
+enum class TemporalHistorySource
+{
+	None,
+	Source,
+	PreLayerInput
+};
+
+struct TemporalSettings
+{
+	bool enabled = false;
+	TemporalHistorySource historySource = TemporalHistorySource::None;
+	unsigned requestedHistoryLength = 0;
+	unsigned effectiveHistoryLength = 0;
+};
+
+struct FeedbackSettings
+{
+	bool enabled = false;
+	std::string writePassId;
+};
+
+struct ShaderTextureAsset
+{
+	std::string id;
+	std::filesystem::path path;
+	std::filesystem::file_time_type writeTime;
+};
+
+struct ShaderFontAsset
+{
+	std::string id;
+	std::filesystem::path path;
+	std::filesystem::file_time_type writeTime;
+};
+
+struct ShaderPassDefinition
+{
+	std::string id;
+	std::string entryPoint;
+	std::filesystem::path sourcePath;
+	std::filesystem::file_time_type sourceWriteTime;
+	std::vector<std::string> inputNames;
+	std::string outputName;
+};
+
+struct ShaderPassBuildSource
+{
+	std::string passId;
+	std::string fragmentShaderSource;
+	std::vector<std::string> inputNames;
+	std::string outputName;
+};
+
+struct ShaderPackage
+{
+	std::string id;
+	std::string displayName;
+	std::string description;
+	std::string category;
+	std::string entryPoint;
+	std::filesystem::path directoryPath;
+	std::filesystem::path shaderPath;
+	std::filesystem::path manifestPath;
+	std::vector<ShaderPassDefinition> passes;
+	std::vector<ShaderParameterDefinition> parameters;
+	std::vector<ShaderTextureAsset> textureAssets;
+	std::vector<ShaderFontAsset> fontAssets;
+	TemporalSettings temporal;
+	FeedbackSettings feedback;
+	std::filesystem::file_time_type shaderWriteTime;
+	std::filesystem::file_time_type manifestWriteTime;
+};
+
+struct ShaderPackageStatus
+{
+	std::string id;
+	std::string displayName;
+	std::string description;
+	std::string category;
+	bool available = false;
+	std::string error;
+};
+
+struct RuntimeRenderState
+{
+	std::string layerId;
+	std::string shaderId;
+	std::string shaderName;
+	std::vector<ShaderParameterDefinition> parameterDefinitions;
+	std::map<std::string, ShaderParameterValue> parameterValues;
+	std::vector<ShaderTextureAsset> textureAssets;
+	std::vector<ShaderFontAsset> fontAssets;
+	double timeSeconds = 0.0;
+	double utcTimeSeconds = 0.0;
+	double utcOffsetSeconds = 0.0;
+	double startupRandom = 0.0;
+	double frameCount = 0.0;
+	double mixAmount = 1.0;
+	double bypass = 0.0;
+	unsigned inputWidth = 0;
+	unsigned inputHeight = 0;
+	unsigned outputWidth = 0;
+	unsigned outputHeight = 0;
+	bool isTemporal = false;
+	TemporalHistorySource temporalHistorySource = TemporalHistorySource::None;
+	unsigned requestedTemporalHistoryLength = 0;
+	unsigned effectiveTemporalHistoryLength = 0;
+	FeedbackSettings feedback;
+};

src/stdafx.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>

src/video/DeckLinkAPI_i.c

@@ -0,0 +1,486 @@
+
+
+/* this ALWAYS GENERATED file contains the IIDs and CLSIDs */
+
+/* link this file in with the server and any clients */
+
+
+ /* File created by MIDL compiler version 8.01.0628 */
+/* at Tue Jan 19 14:14:07 2038
+ */
+/* Compiler settings for ..\..\3rdParty\Blackmagic DeckLink SDK 16.0\Win\include\DeckLinkAPI.idl:
+    Oicf, W1, Zp8, env=Win64 (32b run), target_arch=AMD64 8.01.0628 
+    protocol : all , ms_ext, c_ext, robust
+    error checks: allocation ref bounds_check enum stub_data 
+    VC __declspec() decoration level: 
+         __declspec(uuid()), __declspec(selectany), __declspec(novtable)
+         DECLSPEC_UUID(), MIDL_INTERFACE()
+*/
+/* @@MIDL_FILE_HEADING(  ) */
+
+
+
+#ifdef __cplusplus
+extern "C"{
+#endif 
+
+
+#include <rpc.h>
+#include <rpcndr.h>
+
+#ifdef _MIDL_USE_GUIDDEF_
+
+#ifndef INITGUID
+#define INITGUID
+#include <guiddef.h>
+#undef INITGUID
+#else
+#include <guiddef.h>
+#endif
+
+#define MIDL_DEFINE_GUID(type,name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) \
+        DEFINE_GUID(name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8)
+
+#else // !_MIDL_USE_GUIDDEF_
+
+#ifndef __IID_DEFINED__
+#define __IID_DEFINED__
+
+typedef struct _IID
+{
+    unsigned long x;
+    unsigned short s1;
+    unsigned short s2;
+    unsigned char  c[8];
+} IID;
+
+#endif // __IID_DEFINED__
+
+#ifndef CLSID_DEFINED
+#define CLSID_DEFINED
+typedef IID CLSID;
+#endif // CLSID_DEFINED
+
+#define MIDL_DEFINE_GUID(type,name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) \
+        EXTERN_C __declspec(selectany) const type name = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
+
+#endif // !_MIDL_USE_GUIDDEF_
+
+MIDL_DEFINE_GUID(IID, LIBID_DeckLinkAPI,0xD864517A,0xEDD5,0x466D,0x86,0x7D,0xC8,0x19,0xF1,0xC0,0x52,0xBB);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkTimecode,0xBC6CFBD3,0x8317,0x4325,0xAC,0x1C,0x12,0x16,0x39,0x1E,0x93,0x40);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDisplayModeIterator,0x9C88499F,0xF601,0x4021,0xB8,0x0B,0x03,0x2E,0x4E,0xB4,0x1C,0x35);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDisplayMode,0x3EB2C1AB,0x0A3D,0x4523,0xA3,0xAD,0xF4,0x0D,0x7F,0xB1,0x4E,0x78);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLink,0xC418FBDD,0x0587,0x48ED,0x8F,0xE5,0x64,0x0F,0x0A,0x14,0xAF,0x91);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration,0x5a68ffd4,0x1c12,0x4ede,0xa6,0xd2,0x45,0x45,0x1d,0x38,0x5f,0xc1);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderConfiguration,0x138050E5,0xC60A,0x4552,0xBF,0x3F,0x0F,0x35,0x80,0x49,0x32,0x7E);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDeckControlStatusCallback,0x53436FFB,0xB434,0x4906,0xBA,0xDC,0xAE,0x30,0x60,0xFF,0xE8,0xEF);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDeckControl,0x8E1C3ACE,0x19C7,0x4E00,0x8B,0x92,0xD8,0x04,0x31,0xD9,0x58,0xBE);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingDeviceNotificationCallback,0xF9531D64,0x3305,0x4B29,0xA3,0x87,0x7F,0x74,0xBB,0x0D,0x0E,0x84);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingH264InputCallback,0x823C475F,0x55AE,0x46F9,0x89,0x0C,0x53,0x7C,0xC5,0xCE,0xDC,0xCA);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingDiscovery,0x2C837444,0xF989,0x4D87,0x90,0x1A,0x47,0xC8,0xA3,0x6D,0x09,0x6D);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingVideoEncodingMode,0x1AB8035B,0xCD13,0x458D,0xB6,0xDF,0x5E,0x8F,0x7C,0x21,0x41,0xD9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingMutableVideoEncodingMode,0x19BF7D90,0x1E0A,0x400D,0xB2,0xC6,0xFF,0xC4,0xE7,0x8A,0xD4,0x9D);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingVideoEncodingModePresetIterator,0x7AC731A3,0xC950,0x4AD0,0x80,0x4A,0x83,0x77,0xAA,0x51,0xC6,0xC4);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingDeviceInput,0x24B6B6EC,0x1727,0x44BB,0x98,0x18,0x34,0xFF,0x08,0x6A,0xCF,0x98);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingH264NALPacket,0xE260E955,0x14BE,0x4395,0x97,0x75,0x9F,0x02,0xCC,0x0A,0x9D,0x89);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingAudioPacket,0xD9EB5902,0x1AD2,0x43F4,0x9E,0x2C,0x3C,0xFA,0x50,0xB5,0xEE,0x19);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingMPEG2TSPacket,0x91810D1C,0x4FB3,0x4AAA,0xAE,0x56,0xFA,0x30,0x1D,0x3D,0xFA,0x4C);
+
+
+MIDL_DEFINE_GUID(IID, IID_IBMDStreamingH264NALParser,0x5867F18C,0x5BFA,0x4CCC,0xB2,0xA7,0x9D,0xFD,0x14,0x04,0x17,0xD2);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CBMDStreamingDiscovery,0x23A4EDF5,0xA0E5,0x432C,0x94,0xEF,0x3B,0xAB,0xB5,0xF8,0x1C,0x82);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CBMDStreamingH264NALParser,0x7753EFBD,0x951C,0x407C,0x97,0xA5,0x23,0xC7,0x37,0xB7,0x3B,0x52);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoOutputCallback,0x5BE6DF26,0x02CE,0x433E,0x99,0xD9,0x9A,0x87,0xC3,0xAC,0x17,0x1F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInputCallback,0x3A94F075,0xC37D,0x4BA8,0xBC,0xC0,0x1D,0x77,0x8C,0x8F,0x88,0x1B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderInputCallback,0xACF13E61,0xF4A0,0x4974,0xA6,0xA7,0x59,0xAF,0xF6,0x26,0x8B,0x31);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBufferAllocator,0xF35DFA8D,0x9078,0x4622,0x95,0xBB,0x56,0x89,0x40,0x54,0xEB,0x0F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBufferAllocatorProvider,0x6DF6F20A,0xD8DF,0x45D2,0x89,0x14,0x38,0x3C,0xE7,0xE6,0x24,0x3F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAudioOutputCallback,0x403C681B,0x7F46,0x4A12,0xB9,0x93,0x2B,0xB1,0x27,0x08,0x4E,0xE6);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIterator,0x50FB36CD,0x3063,0x4B73,0xBD,0xBB,0x95,0x80,0x87,0xF2,0xD8,0xBA);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAPIInformation,0x7BEA3C68,0x730D,0x4322,0xAF,0x34,0x8A,0x71,0x52,0xB5,0x32,0xA4);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPFlowAttributes,0xCDA938DA,0x6479,0x40C6,0xB2,0xEC,0xA3,0x57,0x9B,0x3A,0xEE,0xCD);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPFlowStatus,0x31C41656,0x4992,0x4396,0xBB,0xE9,0x5F,0x84,0x06,0xAA,0xB5,0xAF);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPFlowSetting,0x86DD9174,0x27D3,0x4032,0xB2,0xAD,0x60,0x67,0xC3,0xBB,0x24,0x24);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPFlow,0xC5FC83C7,0x5B8E,0x42A7,0x9A,0x40,0x7C,0x06,0x59,0x55,0xD4,0xE1);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPFlowIterator,0xBD296AB2,0xA5C5,0x4153,0x88,0x8F,0xAA,0xB1,0xFD,0xBD,0x8A,0x5C);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkOutput,0x5F227C95,0x39D7,0x46C7,0x8B,0x7D,0x9C,0x81,0x79,0x5F,0xBB,0xE4);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput,0x6A515F8A,0xFBCE,0x4853,0xB0,0xF7,0x2A,0x09,0xDB,0x1E,0xCA,0x0B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkIPExtensions,0x46CF7903,0xA9FD,0x4D0B,0x8F,0xFC,0x01,0x03,0x72,0x2A,0xB4,0x42);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkHDMIInputEDID,0xABBBACBC,0x45BC,0x4665,0x9D,0x92,0xAC,0xE6,0xE5,0xA9,0x79,0x02);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderInput,0x46C1332E,0x6FD9,0x472A,0x85,0x91,0xFE,0x59,0xC2,0x21,0x92,0xE1);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBuffer,0x81F03D70,0xDE13,0x4B17,0x87,0x3A,0xC8,0xAC,0x96,0x89,0xC6,0x82);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrame,0x6502091C,0x615F,0x4F51,0xBA,0xF6,0x45,0xC4,0x25,0x6D,0xD5,0xB0);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkMutableVideoFrame,0xCF9EB134,0x0374,0x4C5B,0x95,0xFA,0x1E,0xC1,0x48,0x19,0xFF,0x62);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrame3DExtensions,0xD4DBE9C6,0xB4D2,0x49D3,0xAB,0xF2,0xB4,0xE8,0x6C,0x73,0x91,0xB0);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameMetadataExtensions,0xE232A5B7,0x4DB4,0x44C9,0x91,0x52,0xF4,0x7C,0x12,0xE5,0xF0,0x51);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameMutableMetadataExtensions,0xCC198FC6,0x8298,0x4419,0x94,0x2D,0x83,0x57,0xEC,0x35,0x5E,0x58);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoInputFrame,0xC9ADD3D2,0xBE52,0x488D,0xAB,0x2D,0x7F,0xDE,0xF7,0xAF,0x0C,0x95);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAncillaryPacket,0xF5C0D498,0x5CD3,0x4C77,0x97,0x73,0x8E,0xFA,0x20,0xBB,0x33,0x4B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAncillaryPacketIterator,0x10F1AA88,0x54BE,0x42F7,0xB9,0xF8,0xEC,0x2F,0x5F,0x09,0x95,0x51);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameAncillaryPackets,0x8A72D630,0x8070,0x4D05,0x8A,0x93,0xE6,0x0C,0x40,0xEE,0x08,0x8A);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameAncillary,0x732E723C,0xD1A4,0x4E29,0x9E,0x8E,0x4A,0x88,0x79,0x7A,0x00,0x04);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderPacket,0xB693F36C,0x316E,0x4AF1,0xB6,0xC2,0xF3,0x89,0xA4,0xBC,0xA6,0x20);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderVideoPacket,0x4E7FD944,0xE8C7,0x4EAC,0xB8,0xC0,0x7B,0x77,0xF8,0x0F,0x5A,0xE0);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderAudioPacket,0x49E8EDC8,0x693B,0x4E14,0x8E,0xF6,0x12,0xC6,0x58,0xF5,0xA0,0x7A);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkH265NALPacket,0x639C8E0B,0x68D5,0x4BDE,0xA6,0xD4,0x95,0xF3,0xAE,0xAF,0xF2,0xE7);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAudioInputPacket,0xE43D5870,0x2894,0x11DE,0x8C,0x30,0x08,0x00,0x20,0x0C,0x9A,0x66);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkScreenPreviewCallback,0xD4FA2345,0x9FBA,0x4497,0x95,0xC3,0xC0,0xC3,0xCE,0xD3,0xCD,0xA8);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkGLScreenPreviewHelper,0xCEB778E2,0xC202,0x4EC8,0x90,0x85,0x0C,0xD2,0x85,0xCC,0x55,0x22);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDX9ScreenPreviewHelper,0xF2DD78CA,0x2921,0x4AC2,0xB5,0xBC,0xBF,0xDC,0xC2,0x03,0x5A,0x1F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkWPFDX9ScreenPreviewHelper,0xC59346CD,0x9326,0x4266,0xAC,0x2D,0x5C,0x19,0x0F,0x57,0x99,0xEE);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkNotificationCallback,0xb002a1ec,0x070d,0x4288,0x82,0x89,0xbd,0x5d,0x36,0xe5,0xff,0x0d);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkNotification,0x1d70faac,0xfd27,0x4866,0x9d,0xe6,0x09,0x39,0xd1,0xe4,0xc7,0xf1);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfileAttributes,0xF47551D7,0xAD22,0x47AF,0xBC,0xFD,0x6B,0xE8,0x8A,0xA8,0x79,0xD9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfileIterator,0x29E5A8C0,0x8BE4,0x46EB,0x93,0xAC,0x31,0xDA,0xAB,0x5B,0x7B,0xF2);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfile,0x16093466,0x674A,0x432B,0x9D,0xA0,0x1A,0xC2,0xC5,0xA8,0x24,0x1C);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfileCallback,0xA4F9341E,0x97AA,0x4E04,0x89,0x35,0x15,0xF8,0x09,0x89,0x8C,0xEA);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfileManager,0x30D41429,0x3998,0x4B6D,0x84,0xF8,0x78,0xC9,0x4A,0x79,0x7C,0x6E);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkStatistics,0x21CB2ED1,0x4429,0x42BE,0xAA,0xF3,0x22,0xA3,0xB1,0xDD,0x3A,0xE0);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkStatus,0x2A04A635,0xED42,0x41EF,0x93,0x42,0x0E,0x11,0xF8,0xCF,0x6B,0x5E);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkKeyer,0x89AFCAF5,0x65F8,0x421E,0x98,0xF7,0x96,0xFE,0x5F,0x5B,0xFB,0xA3);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoConversion,0x94C536D6,0xC821,0x42F5,0xA6,0x00,0xC6,0x66,0x29,0x95,0x51,0x01);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDeviceNotificationCallback,0x4997053B,0x0ADF,0x4CC8,0xAC,0x70,0x7A,0x50,0xC4,0xBE,0x72,0x8F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDiscovery,0xCDBF631C,0xBC76,0x45FA,0xB4,0x4D,0xC5,0x50,0x59,0xBC,0x61,0x01);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkIterator,0xBA6C6F44,0x6DA5,0x4DCE,0x94,0xAA,0xEE,0x2D,0x13,0x72,0xA6,0x76);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkAPIInformation,0x263CA19F,0xED09,0x482E,0x9F,0x9D,0x84,0x00,0x57,0x83,0xA2,0x37);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkGLScreenPreviewHelper,0x1E332DAE,0x0D04,0x49EB,0xB8,0xA1,0xB6,0xE0,0x0B,0x2B,0x6B,0xD0);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkGL3ScreenPreviewHelper,0x166804E4,0x15EF,0x4BFD,0xB6,0x23,0xB5,0xBA,0x92,0x16,0x67,0xC5);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkDX9ScreenPreviewHelper,0x0EB111ED,0xADA6,0x43A6,0x8B,0x16,0xCA,0x5D,0x27,0xEE,0xA1,0x5E);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkWPFDX9ScreenPreviewHelper,0x5E64496D,0x4BB2,0x45D5,0x9B,0x63,0xBF,0x1B,0x46,0x3B,0x18,0xAF);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkVideoConversion,0x771AD62D,0x671F,0x4442,0xAC,0x90,0xB0,0x70,0xC5,0x41,0x09,0x0A);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkDiscovery,0x22FBFC33,0x8D07,0x495C,0xA5,0xBF,0xDA,0xB5,0xEA,0x9B,0x82,0xDB);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkVideoFrameAncillaryPackets,0x6F47097E,0xB390,0x4650,0xBC,0xB6,0xC4,0xD5,0x2F,0xAA,0x16,0x43);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkStatus_v15_3_1,0x5F558200,0x4028,0x49BC,0xBE,0xAC,0xDB,0x3F,0xA4,0xA9,0x6E,0x46);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration_v15_3_1,0x912F634B,0x2D4E,0x40A4,0x8A,0xAB,0x8D,0x80,0xB7,0x3F,0x12,0x89);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBuffer_v15_3_1,0xCCB4B64A,0x5C86,0x4E02,0xB7,0x78,0x88,0x5D,0x35,0x27,0x09,0xFE);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBufferAllocator_v15_3_1,0x3481A4DF,0x2B11,0x4E55,0xAC,0x61,0x83,0x6B,0x87,0x98,0x5E,0x9A);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoBufferAllocatorProvider_v15_3_1,0x08B80403,0xBFF2,0x49D0,0xB4,0x48,0x8C,0x90,0x8B,0x9E,0x9F,0xC9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput_v15_3_1,0x4095DB82,0xE294,0x4B8C,0xAA,0xA8,0x3B,0x9E,0x80,0xC4,0x93,0x36);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkOutput_v15_3_1,0x1A8077F1,0x9FE2,0x4533,0x81,0x47,0x22,0x94,0x30,0x5E,0x25,0x3F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoConversion_v15_3_1,0xA48755D9,0x8BD5,0x4727,0xA1,0xE9,0x06,0x9F,0xDE,0xDB,0xA6,0xE9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkNotification_v15_3_1,0xB85DF4C8,0xBDF5,0x47C1,0x80,0x64,0x28,0x16,0x2E,0xBD,0xD4,0xEB);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkVideoConversion_v15_3_1,0x89BA47BD,0x1FE2,0x4D76,0x9B,0xFE,0xDE,0x85,0x04,0x9C,0x49,0x87);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkProfileAttributes_v15_3_1,0x17D4BF8E,0x4911,0x473A,0x80,0xA0,0x73,0x1C,0xF6,0xFF,0x34,0x5B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoOutputCallback_v14_2_1,0x20AA5225,0x1958,0x47CB,0x82,0x0B,0x80,0xA8,0xD5,0x21,0xA6,0xEE);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInputCallback_v14_2_1,0xC6FCE4C9,0xC4E4,0x4047,0x82,0xFB,0x5D,0x23,0x82,0x32,0xA9,0x02);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkMemoryAllocator_v14_2_1,0xB36EB6E7,0x9D29,0x4AA8,0x92,0xEF,0x84,0x3B,0x87,0xA2,0x89,0xE8);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkOutput_v14_2_1,0xBE2D9020,0x461E,0x442F,0x84,0xB7,0xE9,0x49,0xCB,0x95,0x3B,0x9D);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput_v14_2_1,0xC21CDB6E,0xF414,0x46E4,0xA6,0x36,0x80,0xA5,0x66,0xE0,0xED,0x37);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderInput_v14_2_1,0xF222551D,0x13DF,0x4FD8,0xB5,0x87,0x9D,0x4F,0x19,0xEC,0x12,0xC9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrame_v14_2_1,0x3F716FE0,0xF023,0x4111,0xBE,0x5D,0xEF,0x44,0x14,0xC0,0x5B,0x17);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkMutableVideoFrame_v14_2_1,0x69E2639F,0x40DA,0x4E19,0xB6,0xF2,0x20,0xAC,0xE8,0x15,0xC3,0x90);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrame3DExtensions_v14_2_1,0xDA0F7E4A,0xEDC7,0x48A8,0x9C,0xDD,0x2D,0xB5,0x1C,0x72,0x9C,0xD7);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoInputFrame_v14_2_1,0x05CFE374,0x537C,0x4094,0x9A,0x57,0x68,0x05,0x25,0x11,0x8F,0x44);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkScreenPreviewCallback_v14_2_1,0xB1D3F49A,0x85FE,0x4C5D,0x95,0xC8,0x0B,0x5D,0x5D,0xCC,0xD4,0x38);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkGLScreenPreviewHelper_v14_2_1,0x504E2209,0xCAC7,0x4C1A,0x9F,0xB4,0xC5,0xBB,0x62,0x74,0xD2,0x2F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkDX9ScreenPreviewHelper_v14_2_1,0x2094B522,0xD1A1,0x40C0,0x9A,0xC7,0x1C,0x01,0x22,0x18,0xEF,0x02);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkWPFDX9ScreenPreviewHelper_v14_2_1,0xAD8EC84A,0x7DDE,0x11E9,0x8F,0x9E,0x2A,0x86,0xE4,0x08,0x5A,0x59);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoConversion_v14_2_1,0x3BBCB8A2,0xDA2C,0x42D9,0xB5,0xD8,0x88,0x08,0x36,0x44,0xE9,0x9A);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkGLScreenPreviewHelper_v14_2_1,0xF63E77C7,0xB655,0x4A4A,0x9A,0xD0,0x3C,0xA8,0x5D,0x39,0x43,0x43);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkGL3ScreenPreviewHelper_v14_2_1,0x00696A71,0xEBC7,0x491F,0xAC,0x02,0x18,0xD3,0x39,0x3F,0x33,0xF0);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkDX9ScreenPreviewHelper_v14_2_1,0xCC010023,0xE01D,0x4525,0x9D,0x59,0x80,0xC8,0xAB,0x3D,0xC7,0xA0);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkWPFDX9ScreenPreviewHelper_v14_2_1,0xEF2A8478,0x7DDF,0x11E9,0x8F,0x9E,0x2A,0x86,0xE4,0x08,0x5A,0x59);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkVideoConversion_v14_2_1,0x7DBBBB11,0x5B7B,0x467D,0xAE,0xA4,0xCE,0xA4,0x68,0xFD,0x36,0x8C);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInputCallback_v11_5_1,0xDD04E5EC,0x7415,0x42AB,0xAE,0x4A,0xE8,0x0C,0x4D,0xFC,0x04,0x4A);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput_v11_5_1,0x9434C6E4,0xB15D,0x4B1C,0x97,0x9E,0x66,0x1E,0x3D,0xDC,0xB4,0xB9);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration_v10_11,0xEF90380B,0x4AE5,0x4346,0x90,0x77,0xE2,0x88,0xE1,0x49,0xF1,0x29);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAttributes_v10_11,0xABC11843,0xD966,0x44CB,0x96,0xE2,0xA1,0xCB,0x5D,0x31,0x35,0xC4);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkNotification_v10_11,0x0A1FB207,0xE215,0x441B,0x9B,0x19,0x6F,0xA1,0x57,0x59,0x46,0xC5);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkOutput_v10_11,0xCC5C8A6E,0x3F2F,0x4B3A,0x87,0xEA,0xFD,0x78,0xAF,0x30,0x05,0x64);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput_v10_11,0xAF22762B,0xDFAC,0x4846,0xAA,0x79,0xFA,0x88,0x83,0x56,0x09,0x95);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderInput_v10_11,0x270587DA,0x6B7D,0x42E7,0xA1,0xF0,0x6D,0x85,0x3F,0x58,0x11,0x85);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkIterator_v10_11,0x87D2693F,0x8D4A,0x45C7,0xB4,0x3F,0x10,0xAC,0xBA,0x25,0xE6,0x8F);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkDiscovery_v10_11,0x652615D4,0x26CD,0x4514,0xB1,0x61,0x2F,0xD5,0x07,0x2E,0xD0,0x08);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration_v10_9,0xCB71734A,0xFE37,0x4E8D,0x8E,0x13,0x80,0x21,0x33,0xA1,0xC3,0xF2);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CBMDStreamingDiscovery_v10_8,0x0CAA31F6,0x8A26,0x40B0,0x86,0xA4,0xBF,0x58,0xDC,0xCA,0x71,0x0C);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration_v10_4,0x1E69FCF6,0x4203,0x4936,0x80,0x76,0x2A,0x9F,0x4C,0xFD,0x50,0xCB);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkConfiguration_v10_2,0xC679A35B,0x610C,0x4D09,0xB7,0x48,0x1D,0x04,0x78,0x10,0x0F,0xC0);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAncillaryPacket_v15_2,0xCC5BBF7E,0x029C,0x4D3B,0x91,0x58,0x60,0x00,0xEF,0x5E,0x36,0x70);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkAncillaryPacketIterator_v15_2,0x3FC8994B,0x88FB,0x4C17,0x96,0x8F,0x9A,0xAB,0x69,0xD9,0x64,0xA7);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameAncillaryPackets_v15_2,0x6C186C0F,0x459E,0x41D8,0xAE,0xE2,0x48,0x12,0xD8,0x1A,0xEE,0x68);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkVideoFrameAncillaryPackets_v15_2,0xF891AD29,0xD0C2,0x46E9,0xA9,0x26,0x4E,0x2D,0x0D,0xD8,0xCF,0xAD);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkVideoFrameMetadataExtensions_v11_5,0xD5973DC9,0x6432,0x46D0,0x8F,0x0B,0x24,0x96,0xF8,0xA1,0x23,0x8F);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkOutput_v11_4,0x065A0F6C,0xC508,0x4D0D,0xB9,0x19,0xF5,0xEB,0x0E,0xBF,0xC9,0x6B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkInput_v11_4,0x2A88CF76,0xF494,0x4216,0xA7,0xEF,0xDC,0x74,0xEE,0xB8,0x38,0x82);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkIterator_v10_8,0x1F2E109A,0x8F4F,0x49E4,0x92,0x03,0x13,0x55,0x95,0xCB,0x6F,0xA5);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CDeckLinkDiscovery_v10_8,0x1073A05C,0xD885,0x47E9,0xB3,0xC6,0x12,0x9B,0x3F,0x9F,0x64,0x8B);
+
+
+MIDL_DEFINE_GUID(IID, IID_IDeckLinkEncoderConfiguration_v10_5,0x67455668,0x0848,0x45DF,0x8D,0x8E,0x35,0x0A,0x77,0xC9,0xA0,0x28);
+
+#undef MIDL_DEFINE_GUID
+
+#ifdef __cplusplus
+}
+#endif
+
+
+

src/video/DeckLinkDisplayMode.cpp

@@ -0,0 +1,146 @@
+#include "DeckLinkDisplayMode.h"
+
+#include <cctype>
+
+std::string NormalizeModeToken(const std::string& value)
+{
+	std::string normalized;
+	for (unsigned char ch : value)
+	{
+		if (std::isalnum(ch))
+			normalized.push_back(static_cast<char>(std::tolower(ch)));
+	}
+	return normalized;
+}
+
+bool ResolveConfiguredDisplayMode(const std::string& videoFormat, const std::string& frameRate, BMDDisplayMode& displayMode, std::string& displayModeName)
+{
+	VideoFormat videoMode;
+	if (!ResolveConfiguredVideoFormat(videoFormat, frameRate, videoMode))
+		return false;
+
+	displayMode = videoMode.displayMode;
+	displayModeName = videoMode.displayName;
+	return true;
+}
+
+bool ResolveConfiguredVideoFormat(const std::string& videoFormat, const std::string& frameRate, VideoFormat& videoMode)
+{
+	const std::string formatToken = NormalizeModeToken(videoFormat);
+	const std::string frameToken = NormalizeModeToken(frameRate);
+	const std::string combinedToken = formatToken + frameToken;
+
+	struct ModeOption
+	{
+		const char* token;
+		BMDDisplayMode mode;
+		const char* displayName;
+	};
+
+	static const ModeOption options[] =
+	{
+		{ "720p50", bmdModeHD720p50, "720p50" },
+		{ "hd720p50", bmdModeHD720p50, "720p50" },
+		{ "720p5994", bmdModeHD720p5994, "720p59.94" },
+		{ "hd720p5994", bmdModeHD720p5994, "720p59.94" },
+		{ "720p60", bmdModeHD720p60, "720p60" },
+		{ "hd720p60", bmdModeHD720p60, "720p60" },
+		{ "1080i50", bmdModeHD1080i50, "1080i50" },
+		{ "hd1080i50", bmdModeHD1080i50, "1080i50" },
+		{ "1080i5994", bmdModeHD1080i5994, "1080i59.94" },
+		{ "hd1080i5994", bmdModeHD1080i5994, "1080i59.94" },
+		{ "1080i60", bmdModeHD1080i6000, "1080i60" },
+		{ "hd1080i60", bmdModeHD1080i6000, "1080i60" },
+		{ "1080p2398", bmdModeHD1080p2398, "1080p23.98" },
+		{ "hd1080p2398", bmdModeHD1080p2398, "1080p23.98" },
+		{ "1080p24", bmdModeHD1080p24, "1080p24" },
+		{ "hd1080p24", bmdModeHD1080p24, "1080p24" },
+		{ "1080p25", bmdModeHD1080p25, "1080p25" },
+		{ "hd1080p25", bmdModeHD1080p25, "1080p25" },
+		{ "1080p2997", bmdModeHD1080p2997, "1080p29.97" },
+		{ "hd1080p2997", bmdModeHD1080p2997, "1080p29.97" },
+		{ "1080p30", bmdModeHD1080p30, "1080p30" },
+		{ "hd1080p30", bmdModeHD1080p30, "1080p30" },
+		{ "1080p50", bmdModeHD1080p50, "1080p50" },
+		{ "hd1080p50", bmdModeHD1080p50, "1080p50" },
+		{ "1080p5994", bmdModeHD1080p5994, "1080p59.94" },
+		{ "hd1080p5994", bmdModeHD1080p5994, "1080p59.94" },
+		{ "1080p60", bmdModeHD1080p6000, "1080p60" },
+		{ "hd1080p60", bmdModeHD1080p6000, "1080p60" },
+		{ "2160p2398", bmdMode4K2160p2398, "2160p23.98" },
+		{ "4k2160p2398", bmdMode4K2160p2398, "2160p23.98" },
+		{ "2160p24", bmdMode4K2160p24, "2160p24" },
+		{ "4k2160p24", bmdMode4K2160p24, "2160p24" },
+		{ "2160p25", bmdMode4K2160p25, "2160p25" },
+		{ "4k2160p25", bmdMode4K2160p25, "2160p25" },
+		{ "2160p2997", bmdMode4K2160p2997, "2160p29.97" },
+		{ "4k2160p2997", bmdMode4K2160p2997, "2160p29.97" },
+		{ "2160p30", bmdMode4K2160p30, "2160p30" },
+		{ "4k2160p30", bmdMode4K2160p30, "2160p30" },
+		{ "2160p50", bmdMode4K2160p50, "2160p50" },
+		{ "4k2160p50", bmdMode4K2160p50, "2160p50" },
+		{ "2160p5994", bmdMode4K2160p5994, "2160p59.94" },
+		{ "4k2160p5994", bmdMode4K2160p5994, "2160p59.94" },
+		{ "2160p60", bmdMode4K2160p60, "2160p60" },
+		{ "4k2160p60", bmdMode4K2160p60, "2160p60" }
+	};
+
+	for (const ModeOption& option : options)
+	{
+		if (combinedToken == option.token || (frameToken.empty() && formatToken == option.token))
+		{
+			videoMode.displayMode = option.mode;
+			videoMode.displayName = option.displayName;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool ResolveConfiguredVideoFormats(
+	const std::string& inputVideoFormat,
+	const std::string& inputFrameRate,
+	const std::string& outputVideoFormat,
+	const std::string& outputFrameRate,
+	VideoFormatSelection& videoModes,
+	std::string& error)
+{
+	if (!ResolveConfiguredVideoFormat(inputVideoFormat, inputFrameRate, videoModes.input))
+	{
+		error = "Unsupported DeckLink inputVideoFormat/inputFrameRate in config/runtime-host.json: " +
+			inputVideoFormat + " / " + inputFrameRate;
+		return false;
+	}
+
+	if (!ResolveConfiguredVideoFormat(outputVideoFormat, outputFrameRate, videoModes.output))
+	{
+		error = "Unsupported DeckLink outputVideoFormat/outputFrameRate in config/runtime-host.json: " +
+			outputVideoFormat + " / " + outputFrameRate;
+		return false;
+	}
+
+	return true;
+}
+
+bool FindDeckLinkDisplayMode(IDeckLinkDisplayModeIterator* iterator, BMDDisplayMode targetMode, IDeckLinkDisplayMode** foundMode)
+{
+	if (!iterator || !foundMode)
+		return false;
+
+	*foundMode = NULL;
+	IDeckLinkDisplayMode* candidate = NULL;
+	while (iterator->Next(&candidate) == S_OK)
+	{
+		if (candidate->GetDisplayMode() == targetMode)
+		{
+			*foundMode = candidate;
+			return true;
+		}
+
+		candidate->Release();
+		candidate = NULL;
+	}
+
+	return false;
+}

src/video/DeckLinkDisplayMode.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include "DeckLinkAPI_h.h"
+
+#include <string>
+
+struct FrameSize
+{
+	unsigned width = 0;
+	unsigned height = 0;
+
+	bool IsEmpty() const { return width == 0 || height == 0; }
+};
+
+inline bool operator==(const FrameSize& left, const FrameSize& right)
+{
+	return left.width == right.width && left.height == right.height;
+}
+
+inline bool operator!=(const FrameSize& left, const FrameSize& right)
+{
+	return !(left == right);
+}
+
+struct VideoFormat
+{
+	BMDDisplayMode displayMode = bmdModeHD1080p5994;
+	std::string displayName = "1080p59.94";
+};
+
+struct VideoFormatSelection
+{
+	VideoFormat input;
+	VideoFormat output;
+};
+
+std::string NormalizeModeToken(const std::string& value);
+bool ResolveConfiguredDisplayMode(const std::string& videoFormat, const std::string& frameRate, BMDDisplayMode& displayMode, std::string& displayModeName);
+bool ResolveConfiguredVideoFormat(const std::string& videoFormat, const std::string& frameRate, VideoFormat& videoMode);
+bool ResolveConfiguredVideoFormats(
+	const std::string& inputVideoFormat,
+	const std::string& inputFrameRate,
+	const std::string& outputVideoFormat,
+	const std::string& outputFrameRate,
+	VideoFormatSelection& videoModes,
+	std::string& error);
+bool FindDeckLinkDisplayMode(IDeckLinkDisplayModeIterator* iterator, BMDDisplayMode targetMode, IDeckLinkDisplayMode** foundMode);

src/video/DeckLinkFrameTransfer.cpp

@@ -0,0 +1,100 @@
+#include "DeckLinkFrameTransfer.h"
+
+#include "DeckLinkSession.h"
+
+////////////////////////////////////////////
+// DeckLink Capture Delegate Class
+////////////////////////////////////////////
+CaptureDelegate::CaptureDelegate(DeckLinkSession* pOwner) :
+	m_pOwner(pOwner),
+	mRefCount(1)
+{
+}
+
+HRESULT CaptureDelegate::QueryInterface(REFIID, LPVOID* ppv)
+{
+	*ppv = NULL;
+	return E_NOINTERFACE;
+}
+
+ULONG CaptureDelegate::AddRef()
+{
+	return InterlockedIncrement(&mRefCount);
+}
+
+ULONG CaptureDelegate::Release()
+{
+	int newCount = InterlockedDecrement(&mRefCount);
+	if (newCount == 0)
+		delete this;
+	return newCount;
+}
+
+HRESULT CaptureDelegate::VideoInputFrameArrived(IDeckLinkVideoInputFrame* inputFrame, IDeckLinkAudioInputPacket*)
+{
+	if (!inputFrame)
+	{
+		// It's possible to receive a NULL inputFrame, but a valid audioPacket. Ignore audio-only frame.
+		return S_OK;
+	}
+
+	bool hasNoInputSource = (inputFrame->GetFlags() & bmdFrameHasNoInputSource) == bmdFrameHasNoInputSource;
+	m_pOwner->HandleVideoInputFrame(inputFrame, hasNoInputSource);
+	return S_OK;
+}
+
+HRESULT CaptureDelegate::VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags)
+{
+	return S_OK;
+}
+
+////////////////////////////////////////////
+// DeckLink Playout Delegate Class
+////////////////////////////////////////////
+PlayoutDelegate::PlayoutDelegate(DeckLinkSession* pOwner) :
+	m_pOwner(pOwner),
+	mRefCount(1)
+{
+}
+
+HRESULT PlayoutDelegate::QueryInterface(REFIID, LPVOID* ppv)
+{
+	*ppv = NULL;
+	return E_NOINTERFACE;
+}
+
+ULONG PlayoutDelegate::AddRef()
+{
+	return InterlockedIncrement(&mRefCount);
+}
+
+ULONG PlayoutDelegate::Release()
+{
+	int newCount = InterlockedDecrement(&mRefCount);
+	if (newCount == 0)
+		delete this;
+	return newCount;
+}
+
+HRESULT PlayoutDelegate::ScheduledFrameCompleted(IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult result)
+{
+	switch (result)
+	{
+	case bmdOutputFrameDisplayedLate:
+	case bmdOutputFrameDropped:
+	case bmdOutputFrameCompleted:
+	case bmdOutputFrameFlushed:
+		// Late/drop counts are recorded by VideoBackend; keep this callback lean.
+		break;
+	default:
+		OutputDebugStringA("ScheduledFrameCompleted() frame did not complete: Unknown error\n");
+	}
+
+	m_pOwner->HandlePlayoutFrameCompleted(completedFrame, result);
+	return S_OK;
+}
+
+HRESULT PlayoutDelegate::ScheduledPlaybackHasStopped()
+{
+	return S_OK;
+}

src/video/DeckLinkFrameTransfer.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <windows.h>
+
+#include <atomic>
+
+#include "DeckLinkAPI_h.h"
+
+class DeckLinkSession;
+
+////////////////////////////////////////////
+// Capture Delegate Class
+////////////////////////////////////////////
+class CaptureDelegate : public IDeckLinkInputCallback
+{
+	DeckLinkSession* m_pOwner;
+	LONG mRefCount;
+
+public:
+	CaptureDelegate(DeckLinkSession* pOwner);
+
+	// IUnknown needs only a dummy implementation
+	virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID* ppv);
+	virtual ULONG STDMETHODCALLTYPE AddRef();
+	virtual ULONG STDMETHODCALLTYPE Release();
+
+	virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame* videoFrame, IDeckLinkAudioInputPacket* audioPacket);
+	virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents notificationEvents, IDeckLinkDisplayMode* newDisplayMode, BMDDetectedVideoInputFormatFlags detectedSignalFlags);
+};
+
+////////////////////////////////////////////
+// Render Delegate Class
+////////////////////////////////////////////
+class PlayoutDelegate : public IDeckLinkVideoOutputCallback
+{
+	DeckLinkSession* m_pOwner;
+	LONG mRefCount;
+
+public:
+	PlayoutDelegate(DeckLinkSession* pOwner);
+
+	// IUnknown needs only a dummy implementation
+	virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID* ppv);
+	virtual ULONG STDMETHODCALLTYPE AddRef();
+	virtual ULONG STDMETHODCALLTYPE Release();
+
+	virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult result);
+	virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped();
+};

src/video/DeckLinkSession.cpp

@@ -0,0 +1,933 @@
+#include "DeckLinkSession.h"
+
+#include <atlbase.h>
+#include <atomic>
+#include <chrono>
+#include <cstdio>
+#include <cstring>
+#include <new>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+namespace
+{
+constexpr int64_t kMinimumHealthyScheduleLeadFrames = 4;
+constexpr int64_t kProactiveScheduleLeadFloorFrames = 1;
+
+class SystemMemoryDeckLinkVideoBuffer : public IDeckLinkVideoBuffer
+{
+public:
+	SystemMemoryDeckLinkVideoBuffer(void* bytes, unsigned long long sizeBytes) :
+		mBytes(bytes),
+		mSizeBytes(sizeBytes),
+		mRefCount(1)
+	{
+	}
+
+	HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID* ppv) override
+	{
+		if (ppv == nullptr)
+			return E_POINTER;
+		if (iid == IID_IUnknown || iid == IID_IDeckLinkVideoBuffer)
+		{
+			*ppv = static_cast<IDeckLinkVideoBuffer*>(this);
+			AddRef();
+			return S_OK;
+		}
+		*ppv = nullptr;
+		return E_NOINTERFACE;
+	}
+
+	ULONG STDMETHODCALLTYPE AddRef() override
+	{
+		return ++mRefCount;
+	}
+
+	ULONG STDMETHODCALLTYPE Release() override
+	{
+		const ULONG refCount = --mRefCount;
+		if (refCount == 0)
+			delete this;
+		return refCount;
+	}
+
+	HRESULT STDMETHODCALLTYPE GetBytes(void** buffer) override
+	{
+		if (buffer == nullptr)
+			return E_POINTER;
+		*buffer = mBytes;
+		return mBytes != nullptr ? S_OK : E_FAIL;
+	}
+
+	HRESULT STDMETHODCALLTYPE GetSize(unsigned long long* bufferSize) override
+	{
+		if (bufferSize == nullptr)
+			return E_POINTER;
+		*bufferSize = mSizeBytes;
+		return S_OK;
+	}
+
+	HRESULT STDMETHODCALLTYPE StartAccess(BMDBufferAccessFlags) override
+	{
+		return S_OK;
+	}
+
+	HRESULT STDMETHODCALLTYPE EndAccess(BMDBufferAccessFlags) override
+	{
+		return S_OK;
+	}
+
+private:
+	void* mBytes = nullptr;
+	unsigned long long mSizeBytes = 0;
+	std::atomic<ULONG> mRefCount;
+};
+
+std::string BstrToUtf8(BSTR value)
+{
+	if (value == nullptr)
+		return std::string();
+
+	const int requiredBytes = WideCharToMultiByte(CP_UTF8, 0, value, -1, NULL, 0, NULL, NULL);
+	if (requiredBytes <= 1)
+		return std::string();
+
+	std::vector<char> utf8Name(static_cast<std::size_t>(requiredBytes), '\0');
+	if (WideCharToMultiByte(CP_UTF8, 0, value, -1, utf8Name.data(), requiredBytes, NULL, NULL) <= 0)
+		return std::string();
+
+	return std::string(utf8Name.data());
+}
+
+bool InputSupportsFormat(IDeckLinkInput* input, BMDDisplayMode displayMode, BMDPixelFormat pixelFormat)
+{
+	if (input == nullptr)
+		return false;
+
+	BOOL supported = FALSE;
+	BMDDisplayMode actualMode = bmdModeUnknown;
+	const HRESULT result = input->DoesSupportVideoMode(
+		bmdVideoConnectionUnspecified,
+		displayMode,
+		pixelFormat,
+		bmdNoVideoInputConversion,
+		bmdSupportedVideoModeDefault,
+		&actualMode,
+		&supported);
+	return result == S_OK && supported != FALSE;
+}
+
+bool OutputSupportsFormat(IDeckLinkOutput* output, BMDDisplayMode displayMode, BMDPixelFormat pixelFormat)
+{
+	if (output == nullptr)
+		return false;
+
+	BOOL supported = FALSE;
+	BMDDisplayMode actualMode = bmdModeUnknown;
+	const HRESULT result = output->DoesSupportVideoMode(
+		bmdVideoConnectionUnspecified,
+		displayMode,
+		pixelFormat,
+		bmdNoVideoOutputConversion,
+		bmdSupportedVideoModeDefault,
+		&actualMode,
+		&supported);
+	return result == S_OK && supported != FALSE;
+}
+}
+
+DeckLinkSession::~DeckLinkSession()
+{
+	ReleaseResources();
+}
+
+void DeckLinkSession::ReleaseResources()
+{
+	if (input != nullptr)
+		input->SetCallback(nullptr);
+	captureDelegate.Release();
+	input.Release();
+
+	if (output != nullptr)
+		output->SetScheduledFrameCompletionCallback(nullptr);
+
+	if (keyer != nullptr)
+	{
+		keyer->Disable();
+		mState.externalKeyingActive = false;
+	}
+	keyer.Release();
+
+	playoutDelegate.Release();
+	outputVideoFrameQueue.clear();
+	output.Release();
+}
+
+bool DeckLinkSession::DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error)
+{
+	CComPtr<IDeckLinkIterator> deckLinkIterator;
+	CComPtr<IDeckLinkDisplayMode> inputMode;
+	CComPtr<IDeckLinkDisplayMode> outputMode;
+
+	mState.inputDisplayModeName = videoModes.input.displayName;
+	mState.outputDisplayModeName = videoModes.output.displayName;
+
+	HRESULT result = CoCreateInstance(CLSID_CDeckLinkIterator, nullptr, CLSCTX_ALL, IID_IDeckLinkIterator, reinterpret_cast<void**>(&deckLinkIterator));
+	if (FAILED(result))
+	{
+		error = "Please install the Blackmagic DeckLink drivers to use the features of this application.";
+		return false;
+	}
+
+	CComPtr<IDeckLink> deckLink;
+	while (deckLinkIterator->Next(&deckLink) == S_OK)
+	{
+		int64_t duplexMode;
+		bool deviceSupportsInternalKeying = false;
+		bool deviceSupportsExternalKeying = false;
+		std::string modelName;
+		CComPtr<IDeckLinkProfileAttributes> deckLinkAttributes;
+
+		if (deckLink->QueryInterface(IID_IDeckLinkProfileAttributes, (void**)&deckLinkAttributes) != S_OK)
+		{
+			printf("Could not obtain the IDeckLinkProfileAttributes interface\n");
+			deckLink.Release();
+			continue;
+		}
+
+		result = deckLinkAttributes->GetInt(BMDDeckLinkDuplex, &duplexMode);
+		BOOL attributeFlag = FALSE;
+		if (deckLinkAttributes->GetFlag(BMDDeckLinkSupportsInternalKeying, &attributeFlag) == S_OK)
+			deviceSupportsInternalKeying = (attributeFlag != FALSE);
+		attributeFlag = FALSE;
+		if (deckLinkAttributes->GetFlag(BMDDeckLinkSupportsExternalKeying, &attributeFlag) == S_OK)
+			deviceSupportsExternalKeying = (attributeFlag != FALSE);
+		CComBSTR modelNameBstr;
+		if (deckLinkAttributes->GetString(BMDDeckLinkModelName, &modelNameBstr) == S_OK)
+			modelName = BstrToUtf8(modelNameBstr);
+
+		if (result != S_OK || duplexMode == bmdDuplexInactive)
+		{
+			deckLink.Release();
+			continue;
+		}
+
+		bool inputUsed = false;
+		if (!input && deckLink->QueryInterface(IID_IDeckLinkInput, (void**)&input) == S_OK)
+			inputUsed = true;
+
+		if (!output && (!inputUsed || (duplexMode == bmdDuplexFull)))
+		{
+			if (deckLink->QueryInterface(IID_IDeckLinkOutput, (void**)&output) != S_OK)
+				output.Release();
+			else
+			{
+				mState.outputModelName = modelName;
+				mState.supportsInternalKeying = deviceSupportsInternalKeying;
+				mState.supportsExternalKeying = deviceSupportsExternalKeying;
+			}
+		}
+
+		deckLink.Release();
+
+		if (output && input)
+			break;
+	}
+
+	if (!output)
+	{
+		error = "Expected an Output DeckLink device";
+		ReleaseResources();
+		return false;
+	}
+
+	CComPtr<IDeckLinkDisplayModeIterator> inputDisplayModeIterator;
+	if (input && input->GetDisplayModeIterator(&inputDisplayModeIterator) != S_OK)
+	{
+		error = "Cannot get input Display Mode Iterator.";
+		ReleaseResources();
+		return false;
+	}
+
+	if (input && !FindDeckLinkDisplayMode(inputDisplayModeIterator, videoModes.input.displayMode, &inputMode))
+	{
+		error = "Cannot get specified input BMDDisplayMode for configured mode: " + videoModes.input.displayName;
+		ReleaseResources();
+		return false;
+	}
+	inputDisplayModeIterator.Release();
+
+	CComPtr<IDeckLinkDisplayModeIterator> outputDisplayModeIterator;
+	if (output->GetDisplayModeIterator(&outputDisplayModeIterator) != S_OK)
+	{
+		error = "Cannot get output Display Mode Iterator.";
+		ReleaseResources();
+		return false;
+	}
+
+	if (!FindDeckLinkDisplayMode(outputDisplayModeIterator, videoModes.output.displayMode, &outputMode))
+	{
+		error = "Cannot get specified output BMDDisplayMode for configured mode: " + videoModes.output.displayName;
+		ReleaseResources();
+		return false;
+	}
+
+	mState.outputFrameSize = { static_cast<unsigned>(outputMode->GetWidth()), static_cast<unsigned>(outputMode->GetHeight()) };
+	mState.inputFrameSize = inputMode
+		? FrameSize{ static_cast<unsigned>(inputMode->GetWidth()), static_cast<unsigned>(inputMode->GetHeight()) }
+		: mState.outputFrameSize;
+	if (!input)
+		mState.inputDisplayModeName = "No input - black frame";
+	BMDTimeValue frameDuration = 0;
+	BMDTimeScale frameTimescale = 0;
+	outputMode->GetFrameRate(&frameDuration, &frameTimescale);
+	mScheduler.Configure(frameDuration, frameTimescale, mPlayoutPolicy);
+	mState.frameBudgetMilliseconds = mScheduler.FrameBudgetMilliseconds();
+
+	mState.inputFrameRowBytes = mState.inputFrameSize.width * 2u;
+	mState.outputFrameRowBytes = mState.outputFrameSize.width * 4u;
+	mState.captureTextureWidth = mState.inputFrameSize.width / 2u;
+	mState.outputPackTextureWidth = mState.outputFrameSize.width;
+	mState.hasInputDevice = input != nullptr;
+	mState.hasInputSource = false;
+
+	return true;
+}
+
+bool DeckLinkSession::SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error)
+{
+	if (!output)
+	{
+		error = "Expected an Output DeckLink device";
+		return false;
+	}
+
+	mState.formatStatusMessage.clear();
+
+	const bool inputTenBitSupported = input != nullptr && InputSupportsFormat(input, videoModes.input.displayMode, bmdFormat10BitYUV);
+	mState.inputPixelFormat = input != nullptr ? ChoosePreferredVideoIOFormat(inputTenBitSupported) : VideoIOPixelFormat::Uyvy8;
+	if (input != nullptr && !inputTenBitSupported)
+		mState.formatStatusMessage += "DeckLink input does not report 10-bit YUV support for the configured mode; using 8-bit capture. ";
+
+	const bool outputTenBitSupported = OutputSupportsFormat(output, videoModes.output.displayMode, bmdFormat10BitYUV);
+	const bool outputTenBitYuvaSupported = OutputSupportsFormat(output, videoModes.output.displayMode, bmdFormat10BitYUVA);
+	mState.outputPixelFormat = outputAlphaRequired
+		? (outputTenBitYuvaSupported ? VideoIOPixelFormat::Yuva10 : VideoIOPixelFormat::Bgra8)
+		: (outputTenBitSupported ? VideoIOPixelFormat::V210 : VideoIOPixelFormat::Bgra8);
+	if (outputAlphaRequired && outputTenBitYuvaSupported)
+		mState.formatStatusMessage += "External keying requires alpha; using 10-bit YUVA output. ";
+	else if (outputAlphaRequired)
+		mState.formatStatusMessage += "External keying requires alpha, but DeckLink output does not report 10-bit YUVA support for the configured mode; using 8-bit BGRA output. ";
+	else if (!outputTenBitSupported)
+		mState.formatStatusMessage += "DeckLink output does not report 10-bit YUV support for the configured mode; using 8-bit BGRA output. ";
+
+	int deckLinkOutputRowBytes = 0;
+	if (output->RowBytesForPixelFormat(DeckLinkPixelFormatForVideoIO(mState.outputPixelFormat), mState.outputFrameSize.width, &deckLinkOutputRowBytes) != S_OK)
+	{
+		error = "DeckLink output setup failed while calculating output row bytes.";
+		return false;
+	}
+	mState.outputFrameRowBytes = static_cast<unsigned>(deckLinkOutputRowBytes);
+	mState.outputPackTextureWidth = OutputIsTenBit()
+		? PackedTextureWidthFromRowBytes(mState.outputFrameRowBytes)
+		: mState.outputFrameSize.width;
+
+	if (InputIsTenBit())
+	{
+		int deckLinkInputRowBytes = 0;
+		if (output->RowBytesForPixelFormat(bmdFormat10BitYUV, mState.inputFrameSize.width, &deckLinkInputRowBytes) == S_OK)
+			mState.inputFrameRowBytes = static_cast<unsigned>(deckLinkInputRowBytes);
+		else
+			mState.inputFrameRowBytes = MinimumV210RowBytes(mState.inputFrameSize.width);
+	}
+	else
+	{
+		mState.inputFrameRowBytes = mState.inputFrameSize.width * 2u;
+	}
+	mState.captureTextureWidth = InputIsTenBit()
+		? PackedTextureWidthFromRowBytes(mState.inputFrameRowBytes)
+		: mState.inputFrameSize.width / 2u;
+
+	std::ostringstream status;
+	status << "DeckLink formats: capture " << (input ? VideoIOPixelFormatName(mState.inputPixelFormat) : "none")
+		<< ", output " << VideoIOPixelFormatName(mState.outputPixelFormat) << ".";
+	if (!mState.formatStatusMessage.empty())
+		status << " " << mState.formatStatusMessage;
+	mState.formatStatusMessage = status.str();
+	return true;
+}
+
+bool DeckLinkSession::ConfigureInput(InputFrameCallback callback, const VideoFormat& inputVideoMode, std::string& error)
+{
+	mInputFrameCallback = std::move(callback);
+
+	if (!input)
+	{
+		mState.hasInputSource = false;
+		mState.inputDisplayModeName = "No input - black frame";
+		return true;
+	}
+
+	const BMDPixelFormat deckLinkInputPixelFormat = DeckLinkPixelFormatForVideoIO(mState.inputPixelFormat);
+	if (input->EnableVideoInput(inputVideoMode.displayMode, deckLinkInputPixelFormat, bmdVideoInputFlagDefault) != S_OK)
+	{
+		if (mState.inputPixelFormat == VideoIOPixelFormat::V210)
+		{
+			OutputDebugStringA("DeckLink 10-bit input could not be enabled; falling back to 8-bit capture.\n");
+			mState.inputPixelFormat = VideoIOPixelFormat::Uyvy8;
+			mState.inputFrameRowBytes = mState.inputFrameSize.width * 2u;
+			mState.captureTextureWidth = mState.inputFrameSize.width / 2u;
+			if (input->EnableVideoInput(inputVideoMode.displayMode, bmdFormat8BitYUV, bmdVideoInputFlagDefault) == S_OK)
+			{
+				std::ostringstream status;
+				status << "DeckLink formats: capture " << VideoIOPixelFormatName(mState.inputPixelFormat)
+					<< ", output " << VideoIOPixelFormatName(mState.outputPixelFormat)
+					<< ". DeckLink 10-bit input enable failed; using 8-bit capture.";
+				mState.formatStatusMessage = status.str();
+				goto input_enabled;
+			}
+		}
+
+		OutputDebugStringA("DeckLink input could not be enabled; continuing in output-only black-frame mode.\n");
+		input.Release();
+		mState.hasInputDevice = false;
+		mState.hasInputSource = false;
+		mState.inputDisplayModeName = "No input - black frame";
+		return true;
+	}
+
+input_enabled:
+	captureDelegate.Attach(new (std::nothrow) CaptureDelegate(this));
+	if (captureDelegate == nullptr)
+	{
+		error = "DeckLink input setup failed while creating the capture callback.";
+		return false;
+	}
+	if (input->SetCallback(captureDelegate) != S_OK)
+	{
+		error = "DeckLink input setup failed while installing the capture callback.";
+		return false;
+	}
+
+	return true;
+}
+
+bool DeckLinkSession::ConfigureOutput(OutputFrameCallback callback, const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error)
+{
+	mOutputFrameCallback = std::move(callback);
+
+	if (output->EnableVideoOutput(outputVideoMode.displayMode, bmdVideoOutputFlagDefault) != S_OK)
+	{
+		error = "DeckLink output setup failed while enabling video output.";
+		return false;
+	}
+
+	if (output->QueryInterface(IID_IDeckLinkKeyer, (void**)&keyer) == S_OK && keyer != NULL)
+		mState.keyerInterfaceAvailable = true;
+
+	if (externalKeyingEnabled)
+	{
+		if (!mState.supportsExternalKeying)
+		{
+			mState.statusMessage = "External keying was requested, but the selected DeckLink output does not report external keying support.";
+		}
+		else if (!mState.keyerInterfaceAvailable)
+		{
+			mState.statusMessage = "External keying was requested, but the selected DeckLink output does not expose the IDeckLinkKeyer interface.";
+		}
+		else if (keyer->Enable(TRUE) != S_OK || keyer->SetLevel(255) != S_OK)
+		{
+			mState.statusMessage = "External keying was requested, but enabling the DeckLink keyer failed.";
+		}
+		else
+		{
+			mState.externalKeyingActive = true;
+			mState.statusMessage = "External keying is active on the selected DeckLink output.";
+		}
+	}
+	else if (mState.supportsExternalKeying)
+	{
+		mState.statusMessage = "Selected DeckLink output supports external keying. Set enableExternalKeying to true in runtime-host.json to request it.";
+	}
+
+	const VideoPlayoutPolicy policy = NormalizeVideoPlayoutPolicy(mPlayoutPolicy);
+	mPlayoutPolicy = policy;
+	for (unsigned i = 0; i < policy.outputFramePoolSize; i++)
+	{
+		CComPtr<IDeckLinkMutableVideoFrame> outputFrame;
+
+		const BMDPixelFormat deckLinkOutputPixelFormat = DeckLinkPixelFormatForVideoIO(mState.outputPixelFormat);
+		if (output->CreateVideoFrame(mState.outputFrameSize.width, mState.outputFrameSize.height, mState.outputFrameRowBytes, deckLinkOutputPixelFormat, bmdFrameFlagFlipVertical, &outputFrame) != S_OK)
+		{
+			error = "DeckLink output setup failed while creating an output video frame.";
+			return false;
+		}
+
+		outputVideoFrameQueue.push_back(outputFrame);
+	}
+
+	playoutDelegate.Attach(new (std::nothrow) PlayoutDelegate(this));
+	if (playoutDelegate == nullptr)
+	{
+		error = "DeckLink output setup failed while creating the playout callback.";
+		return false;
+	}
+
+	if (output->SetScheduledFrameCompletionCallback(playoutDelegate) != S_OK)
+	{
+		error = "DeckLink output setup failed while installing the scheduled-frame callback.";
+		return false;
+	}
+
+	if (!mState.formatStatusMessage.empty())
+		mState.statusMessage = mState.statusMessage.empty() ? mState.formatStatusMessage : mState.formatStatusMessage + " " + mState.statusMessage;
+
+	return true;
+}
+
+double DeckLinkSession::FrameBudgetMilliseconds() const
+{
+	return mScheduler.FrameBudgetMilliseconds();
+}
+
+bool DeckLinkSession::AcquireNextOutputVideoFrame(CComPtr<IDeckLinkMutableVideoFrame>& outputVideoFrame)
+{
+	if (outputVideoFrameQueue.empty())
+		return false;
+
+	outputVideoFrame = outputVideoFrameQueue.front();
+	outputVideoFrameQueue.pop_front();
+	return outputVideoFrame != nullptr;
+}
+
+bool DeckLinkSession::PopulateOutputFrame(IDeckLinkMutableVideoFrame* outputVideoFrame, VideoIOOutputFrame& frame)
+{
+	if (outputVideoFrame == nullptr)
+		return false;
+
+	CComPtr<IDeckLinkVideoBuffer> outputVideoFrameBuffer;
+	if (outputVideoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&outputVideoFrameBuffer) != S_OK)
+		return false;
+
+	if (outputVideoFrameBuffer->StartAccess(bmdBufferAccessWrite) != S_OK)
+		return false;
+
+	void* pFrame = nullptr;
+	outputVideoFrameBuffer->GetBytes(&pFrame);
+
+	frame.bytes = pFrame;
+	frame.rowBytes = outputVideoFrame->GetRowBytes();
+	frame.width = mState.outputFrameSize.width;
+	frame.height = mState.outputFrameSize.height;
+	frame.pixelFormat = mState.outputPixelFormat;
+	outputVideoFrame->AddRef();
+	frame.nativeFrame = outputVideoFrame;
+	frame.nativeBuffer = outputVideoFrameBuffer.Detach();
+	return true;
+}
+
+bool DeckLinkSession::ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame)
+{
+	if (outputVideoFrame == nullptr || output == nullptr)
+	{
+		++mState.deckLinkScheduleFailureCount;
+		return false;
+	}
+
+	if (mScheduleRealignmentPending)
+	{
+		RealignScheduleCursorToPlayback();
+		mScheduleRealignmentPending = false;
+	}
+
+	UpdateScheduleLeadTelemetry();
+	MaybeRealignScheduleCursorForLowLead();
+	const VideoIOScheduleTime scheduleTime = mScheduler.NextScheduleTime();
+	const auto scheduleStart = std::chrono::steady_clock::now();
+	const HRESULT result = output->ScheduleVideoFrame(outputVideoFrame, scheduleTime.streamTime, scheduleTime.duration, scheduleTime.timeScale);
+	const auto scheduleEnd = std::chrono::steady_clock::now();
+	mState.deckLinkScheduleCallMilliseconds = std::chrono::duration_cast<std::chrono::duration<double, std::milli>>(scheduleEnd - scheduleStart).count();
+	if (result != S_OK)
+		++mState.deckLinkScheduleFailureCount;
+	RefreshBufferedVideoFrameCount();
+	return result == S_OK;
+}
+
+void DeckLinkSession::UpdateScheduleLeadTelemetry()
+{
+	if (output == nullptr)
+	{
+		mState.deckLinkScheduleLeadAvailable = false;
+		return;
+	}
+
+	BMDTimeValue streamTime = 0;
+	double playbackSpeed = 0.0;
+	if (output->GetScheduledStreamTime(mScheduler.TimeScale(), &streamTime, &playbackSpeed) != S_OK || playbackSpeed <= 0.0)
+	{
+		mState.deckLinkScheduleLeadAvailable = false;
+		return;
+	}
+
+	const uint64_t playbackFrameIndex = streamTime >= 0 && mScheduler.FrameDuration() > 0
+		? static_cast<uint64_t>(streamTime / mScheduler.FrameDuration())
+		: 0;
+	const uint64_t nextScheduleFrameIndex = mScheduler.ScheduledFrameIndex();
+	mState.deckLinkScheduleLeadAvailable = true;
+	mState.deckLinkPlaybackStreamTime = streamTime;
+	mState.deckLinkPlaybackFrameIndex = playbackFrameIndex;
+	mState.deckLinkNextScheduleFrameIndex = nextScheduleFrameIndex;
+	mState.deckLinkScheduleLeadFrames = static_cast<int64_t>(nextScheduleFrameIndex) - static_cast<int64_t>(playbackFrameIndex);
+}
+
+void DeckLinkSession::MaybeRealignScheduleCursorForLowLead()
+{
+	if (!mState.deckLinkScheduleLeadAvailable)
+		return;
+
+	if (mState.deckLinkScheduleLeadFrames >= kMinimumHealthyScheduleLeadFrames)
+	{
+		mProactiveScheduleRealignmentArmed = true;
+		return;
+	}
+
+	if (!mProactiveScheduleRealignmentArmed || mState.deckLinkScheduleLeadFrames > kProactiveScheduleLeadFloorFrames)
+		return;
+
+	RealignScheduleCursorToPlayback();
+	mProactiveScheduleRealignmentArmed = false;
+}
+
+void DeckLinkSession::RealignScheduleCursorToPlayback()
+{
+	if (output == nullptr)
+		return;
+
+	BMDTimeValue streamTime = 0;
+	double playbackSpeed = 0.0;
+	if (output->GetScheduledStreamTime(mScheduler.TimeScale(), &streamTime, &playbackSpeed) != S_OK || playbackSpeed <= 0.0)
+		return;
+
+	const VideoPlayoutPolicy policy = NormalizeVideoPlayoutPolicy(mPlayoutPolicy);
+	mScheduler.AlignNextScheduleTimeToPlayback(streamTime, policy.targetPrerollFrames);
+	++mState.deckLinkScheduleRealignmentCount;
+	UpdateScheduleLeadTelemetry();
+}
+
+bool DeckLinkSession::ScheduleSystemMemoryFrame(const VideoIOOutputFrame& frame)
+{
+	if (output == nullptr || frame.bytes == nullptr || frame.rowBytes <= 0 || frame.height == 0)
+		return false;
+
+	CComPtr<IDeckLinkVideoBuffer> videoBuffer;
+	videoBuffer.Attach(new (std::nothrow) SystemMemoryDeckLinkVideoBuffer(
+		frame.bytes,
+		static_cast<unsigned long long>(frame.rowBytes) * static_cast<unsigned long long>(frame.height)));
+	if (videoBuffer == nullptr)
+		return false;
+
+	CComPtr<IDeckLinkMutableVideoFrame> outputVideoFrame;
+	const BMDPixelFormat pixelFormat = DeckLinkPixelFormatForVideoIO(frame.pixelFormat);
+	if (output->CreateVideoFrameWithBuffer(
+		frame.width,
+		frame.height,
+		frame.rowBytes,
+		pixelFormat,
+		bmdFrameFlagFlipVertical,
+		videoBuffer,
+		&outputVideoFrame) != S_OK)
+	{
+		return false;
+	}
+
+	IDeckLinkVideoFrame* scheduledFrame = outputVideoFrame;
+	{
+		std::lock_guard<std::mutex> lock(mScheduledSystemFrameMutex);
+		mScheduledSystemFrameBuffers[scheduledFrame] = frame.bytes;
+	}
+
+	if (ScheduleFrame(outputVideoFrame))
+		return true;
+
+	{
+		std::lock_guard<std::mutex> lock(mScheduledSystemFrameMutex);
+		mScheduledSystemFrameBuffers.erase(scheduledFrame);
+	}
+	return false;
+}
+
+bool DeckLinkSession::ScheduleBlackFrame(IDeckLinkMutableVideoFrame* outputVideoFrame)
+{
+	if (outputVideoFrame == nullptr)
+		return false;
+
+	CComPtr<IDeckLinkVideoBuffer> outputVideoFrameBuffer;
+	if (outputVideoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&outputVideoFrameBuffer) != S_OK)
+		return false;
+
+	if (outputVideoFrameBuffer->StartAccess(bmdBufferAccessWrite) != S_OK)
+		return false;
+
+	void* pFrame = nullptr;
+	outputVideoFrameBuffer->GetBytes((void**)&pFrame);
+	memset(pFrame, 0, outputVideoFrame->GetRowBytes() * mState.outputFrameSize.height);
+
+	outputVideoFrameBuffer->EndAccess(bmdBufferAccessWrite);
+	return ScheduleFrame(outputVideoFrame);
+}
+
+void DeckLinkSession::RefreshBufferedVideoFrameCount()
+{
+	if (output == nullptr)
+	{
+		mState.actualDeckLinkBufferedFramesAvailable = false;
+		return;
+	}
+
+	unsigned int bufferedFrameCount = 0;
+	if (output->GetBufferedVideoFrameCount(&bufferedFrameCount) == S_OK)
+	{
+		mState.actualDeckLinkBufferedFrames = bufferedFrameCount;
+		mState.actualDeckLinkBufferedFramesAvailable = true;
+	}
+	else
+	{
+		mState.actualDeckLinkBufferedFramesAvailable = false;
+	}
+}
+
+bool DeckLinkSession::BeginOutputFrame(VideoIOOutputFrame& frame)
+{
+	CComPtr<IDeckLinkMutableVideoFrame> outputVideoFrame;
+	return AcquireNextOutputVideoFrame(outputVideoFrame) && PopulateOutputFrame(outputVideoFrame, frame);
+}
+
+void DeckLinkSession::EndOutputFrame(VideoIOOutputFrame& frame)
+{
+	IDeckLinkVideoBuffer* outputVideoFrameBuffer = static_cast<IDeckLinkVideoBuffer*>(frame.nativeBuffer);
+	if (outputVideoFrameBuffer != nullptr)
+	{
+		outputVideoFrameBuffer->EndAccess(bmdBufferAccessWrite);
+		outputVideoFrameBuffer->Release();
+	}
+	frame.nativeBuffer = nullptr;
+	frame.bytes = nullptr;
+}
+
+VideoPlayoutRecoveryDecision DeckLinkSession::AccountForCompletionResult(VideoIOCompletionResult completionResult, uint64_t readyQueueDepth)
+{
+	return mScheduler.AccountForCompletionResult(completionResult, readyQueueDepth);
+}
+
+bool DeckLinkSession::ScheduleOutputFrame(const VideoIOOutputFrame& frame)
+{
+	if (frame.nativeFrame == nullptr)
+		return ScheduleSystemMemoryFrame(frame);
+
+	IDeckLinkMutableVideoFrame* outputVideoFrame = static_cast<IDeckLinkMutableVideoFrame*>(frame.nativeFrame);
+	const bool scheduled = ScheduleFrame(outputVideoFrame);
+	if (outputVideoFrame != nullptr)
+		outputVideoFrame->Release();
+	return scheduled;
+}
+
+bool DeckLinkSession::PrepareOutputSchedule()
+{
+	mScheduler.Reset();
+	RefreshBufferedVideoFrameCount();
+	return output != nullptr;
+}
+
+bool DeckLinkSession::StartInputStreams()
+{
+	if (!input)
+		return true;
+
+	if (input->StartStreams() != S_OK)
+	{
+		MessageBoxA(NULL, "Could not start the DeckLink input stream.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+	return true;
+}
+
+bool DeckLinkSession::StartScheduledPlayback()
+{
+	if (!output)
+	{
+		MessageBoxA(NULL, "Cannot start playout because no DeckLink output device is available.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+
+	if (output->StartScheduledPlayback(0, mScheduler.TimeScale(), 1.0) != S_OK)
+	{
+		MessageBoxA(NULL, "Could not start DeckLink scheduled playback.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+	RefreshBufferedVideoFrameCount();
+	return true;
+}
+
+bool DeckLinkSession::Start()
+{
+	if (!output)
+	{
+		MessageBoxA(NULL, "Cannot start playout because no DeckLink output device is available.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+	if (outputVideoFrameQueue.empty())
+	{
+		MessageBoxA(NULL, "Cannot start playout because the output frame queue is empty.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+		return false;
+	}
+
+	const VideoPlayoutPolicy policy = NormalizeVideoPlayoutPolicy(mPlayoutPolicy);
+	mPlayoutPolicy = policy;
+	if (!PrepareOutputSchedule())
+		return false;
+
+	for (unsigned i = 0; i < policy.targetPrerollFrames; i++)
+	{
+		CComPtr<IDeckLinkMutableVideoFrame> outputVideoFrame;
+		if (!AcquireNextOutputVideoFrame(outputVideoFrame))
+		{
+			MessageBoxA(NULL, "Could not acquire a preroll output frame.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+			return false;
+		}
+		if (!ScheduleBlackFrame(outputVideoFrame))
+		{
+			MessageBoxA(NULL, "Could not schedule a preroll output frame.", "DeckLink start failed", MB_OK | MB_ICONERROR);
+			return false;
+		}
+	}
+
+	return StartInputStreams() && StartScheduledPlayback();
+}
+
+bool DeckLinkSession::Stop()
+{
+	if (keyer != nullptr)
+	{
+		keyer->Disable();
+		mState.externalKeyingActive = false;
+	}
+
+	if (input)
+	{
+		input->StopStreams();
+		input->DisableVideoInput();
+	}
+
+	if (output)
+	{
+		output->StopScheduledPlayback(0, NULL, 0);
+		output->DisableVideoOutput();
+	}
+
+	return true;
+}
+
+void DeckLinkSession::HandleVideoInputFrame(IDeckLinkVideoInputFrame* inputFrame, bool hasNoInputSource)
+{
+	mState.hasInputSource = !hasNoInputSource;
+	if (hasNoInputSource || mInputFrameCallback == nullptr)
+	{
+		VideoIOFrame frame;
+		frame.width = mState.inputFrameSize.width;
+		frame.height = mState.inputFrameSize.height;
+		frame.pixelFormat = mState.inputPixelFormat;
+		frame.hasNoInputSource = hasNoInputSource;
+		if (mInputFrameCallback)
+			mInputFrameCallback(frame);
+		return;
+	}
+
+	CComPtr<IDeckLinkVideoBuffer> inputFrameBuffer;
+	void* videoPixels = nullptr;
+	if (inputFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&inputFrameBuffer) != S_OK)
+		return;
+	if (inputFrameBuffer->StartAccess(bmdBufferAccessRead) != S_OK)
+		return;
+
+	inputFrameBuffer->GetBytes(&videoPixels);
+
+	VideoIOFrame frame;
+	frame.bytes = videoPixels;
+	frame.rowBytes = inputFrame->GetRowBytes();
+	frame.width = static_cast<unsigned>(inputFrame->GetWidth());
+	frame.height = static_cast<unsigned>(inputFrame->GetHeight());
+	frame.pixelFormat = mState.inputPixelFormat;
+	frame.hasNoInputSource = hasNoInputSource;
+	mInputFrameCallback(frame);
+
+	inputFrameBuffer->EndAccess(bmdBufferAccessRead);
+}
+
+void DeckLinkSession::HandlePlayoutFrameCompleted(IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completionResult)
+{
+	RefreshBufferedVideoFrameCount();
+
+	void* completedSystemBuffer = nullptr;
+	if (completedFrame != nullptr)
+	{
+		bool externalSystemFrame = false;
+		{
+			std::lock_guard<std::mutex> lock(mScheduledSystemFrameMutex);
+			auto externalFrame = mScheduledSystemFrameBuffers.find(completedFrame);
+			if (externalFrame != mScheduledSystemFrameBuffers.end())
+			{
+				completedSystemBuffer = externalFrame->second;
+				mScheduledSystemFrameBuffers.erase(externalFrame);
+				externalSystemFrame = true;
+			}
+		}
+
+		if (!externalSystemFrame)
+		{
+			CComPtr<IDeckLinkMutableVideoFrame> reusableFrame;
+			if (completedFrame->QueryInterface(IID_IDeckLinkMutableVideoFrame, reinterpret_cast<void**>(&reusableFrame)) == S_OK &&
+				reusableFrame != nullptr)
+			{
+				outputVideoFrameQueue.push_back(reusableFrame);
+			}
+		}
+	}
+
+	if (!mOutputFrameCallback)
+		return;
+
+	VideoIOCompletion completion;
+	completion.result = TranslateCompletionResult(completionResult);
+	if (completion.result == VideoIOCompletionResult::DisplayedLate || completion.result == VideoIOCompletionResult::Dropped)
+	{
+		if (mScheduleRealignmentArmed)
+		{
+			mScheduleRealignmentPending = true;
+			mScheduleRealignmentArmed = false;
+		}
+	}
+	else if (completion.result == VideoIOCompletionResult::Completed)
+	{
+		mScheduleRealignmentArmed = true;
+	}
+	completion.outputFrameBuffer = completedSystemBuffer;
+	mOutputFrameCallback(completion);
+}
+
+VideoIOCompletionResult DeckLinkSession::TranslateCompletionResult(BMDOutputFrameCompletionResult completionResult)
+{
+	switch (completionResult)
+	{
+	case bmdOutputFrameDisplayedLate:
+		return VideoIOCompletionResult::DisplayedLate;
+	case bmdOutputFrameDropped:
+		return VideoIOCompletionResult::Dropped;
+	case bmdOutputFrameFlushed:
+		return VideoIOCompletionResult::Flushed;
+	case bmdOutputFrameCompleted:
+		return VideoIOCompletionResult::Completed;
+	default:
+		return VideoIOCompletionResult::Unknown;
+	}
+}

src/video/DeckLinkSession.h

@@ -0,0 +1,102 @@
+#pragma once
+
+#include "DeckLinkAPI_h.h"
+#include "DeckLinkDisplayMode.h"
+#include "DeckLinkFrameTransfer.h"
+#include "DeckLinkVideoIOFormat.h"
+#include "VideoIOFormat.h"
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+#include "VideoPlayoutScheduler.h"
+
+#include <atlbase.h>
+#include <deque>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+
+class OpenGLComposite;
+
+class DeckLinkSession : public VideoIODevice
+{
+public:
+	DeckLinkSession() = default;
+	~DeckLinkSession();
+
+	void ReleaseResources() override;
+	bool DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error) override;
+	bool SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error) override;
+	bool ConfigureInput(InputFrameCallback callback, const VideoFormat& inputVideoMode, std::string& error) override;
+	bool ConfigureOutput(OutputFrameCallback callback, const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error) override;
+	bool PrepareOutputSchedule() override;
+	bool StartInputStreams() override;
+	bool StartScheduledPlayback() override;
+	bool Start() override;
+	bool Stop() override;
+
+	bool HasInputDevice() const { return mState.hasInputDevice; }
+	bool HasInputSource() const { return mState.hasInputSource; }
+	void SetInputSourceMissing(bool missing) { mState.hasInputSource = !missing; }
+	bool InputOutputDimensionsDiffer() const { return mState.inputFrameSize != mState.outputFrameSize; }
+	const FrameSize& InputFrameSize() const { return mState.inputFrameSize; }
+	const FrameSize& OutputFrameSize() const { return mState.outputFrameSize; }
+	unsigned InputFrameWidth() const { return mState.inputFrameSize.width; }
+	unsigned InputFrameHeight() const { return mState.inputFrameSize.height; }
+	unsigned OutputFrameWidth() const { return mState.outputFrameSize.width; }
+	unsigned OutputFrameHeight() const { return mState.outputFrameSize.height; }
+	VideoIOPixelFormat InputPixelFormat() const { return mState.inputPixelFormat; }
+	VideoIOPixelFormat OutputPixelFormat() const { return mState.outputPixelFormat; }
+	bool InputIsTenBit() const { return VideoIOPixelFormatIsTenBit(mState.inputPixelFormat); }
+	bool OutputIsTenBit() const { return VideoIOPixelFormatIsTenBit(mState.outputPixelFormat); }
+	unsigned InputFrameRowBytes() const { return mState.inputFrameRowBytes; }
+	unsigned OutputFrameRowBytes() const { return mState.outputFrameRowBytes; }
+	unsigned CaptureTextureWidth() const { return mState.captureTextureWidth; }
+	unsigned OutputPackTextureWidth() const { return mState.outputPackTextureWidth; }
+	const std::string& FormatStatusMessage() const { return mState.formatStatusMessage; }
+	const std::string& InputDisplayModeName() const { return mState.inputDisplayModeName; }
+	const std::string& OutputModelName() const { return mState.outputModelName; }
+	bool SupportsInternalKeying() const { return mState.supportsInternalKeying; }
+	bool SupportsExternalKeying() const { return mState.supportsExternalKeying; }
+	bool KeyerInterfaceAvailable() const { return mState.keyerInterfaceAvailable; }
+	bool ExternalKeyingActive() const { return mState.externalKeyingActive; }
+	const std::string& StatusMessage() const { return mState.statusMessage; }
+	void SetStatusMessage(const std::string& message) { mState.statusMessage = message; }
+	const VideoIOState& State() const override { return mState; }
+	VideoIOState& MutableState() override { return mState; }
+	double FrameBudgetMilliseconds() const;
+	VideoPlayoutRecoveryDecision AccountForCompletionResult(VideoIOCompletionResult completionResult, uint64_t readyQueueDepth) override;
+	bool BeginOutputFrame(VideoIOOutputFrame& frame) override;
+	void EndOutputFrame(VideoIOOutputFrame& frame) override;
+	bool ScheduleOutputFrame(const VideoIOOutputFrame& frame) override;
+	void HandleVideoInputFrame(IDeckLinkVideoInputFrame* inputFrame, bool hasNoInputSource);
+	void HandlePlayoutFrameCompleted(IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completionResult);
+
+private:
+	bool AcquireNextOutputVideoFrame(CComPtr<IDeckLinkMutableVideoFrame>& outputVideoFrame);
+	bool PopulateOutputFrame(IDeckLinkMutableVideoFrame* outputVideoFrame, VideoIOOutputFrame& frame);
+	bool ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame);
+	void UpdateScheduleLeadTelemetry();
+	void MaybeRealignScheduleCursorForLowLead();
+	void RealignScheduleCursorToPlayback();
+	bool ScheduleSystemMemoryFrame(const VideoIOOutputFrame& frame);
+	bool ScheduleBlackFrame(IDeckLinkMutableVideoFrame* outputVideoFrame);
+	void RefreshBufferedVideoFrameCount();
+	static VideoIOCompletionResult TranslateCompletionResult(BMDOutputFrameCompletionResult completionResult);
+
+	CComPtr<CaptureDelegate>				captureDelegate;
+	CComPtr<PlayoutDelegate>				playoutDelegate;
+	CComPtr<IDeckLinkInput>					input;
+	CComPtr<IDeckLinkOutput>				output;
+	CComPtr<IDeckLinkKeyer>					keyer;
+	std::deque<CComPtr<IDeckLinkMutableVideoFrame>> outputVideoFrameQueue;
+	std::mutex								mScheduledSystemFrameMutex;
+	std::unordered_map<IDeckLinkVideoFrame*, void*> mScheduledSystemFrameBuffers;
+	VideoIOState							mState;
+	VideoPlayoutPolicy						mPlayoutPolicy;
+	VideoPlayoutScheduler					mScheduler;
+	bool									mScheduleRealignmentPending = false;
+	bool									mScheduleRealignmentArmed = true;
+	bool									mProactiveScheduleRealignmentArmed = true;
+	InputFrameCallback						mInputFrameCallback;
+	OutputFrameCallback						mOutputFrameCallback;
+};

src/video/DeckLinkVideoIOFormat.cpp

@@ -0,0 +1,28 @@
+#include "DeckLinkVideoIOFormat.h"
+
+BMDPixelFormat DeckLinkPixelFormatForVideoIO(VideoIOPixelFormat format)
+{
+	switch (format)
+	{
+	case VideoIOPixelFormat::V210:
+		return bmdFormat10BitYUV;
+	case VideoIOPixelFormat::Yuva10:
+		return bmdFormat10BitYUVA;
+	case VideoIOPixelFormat::Bgra8:
+		return bmdFormat8BitBGRA;
+	case VideoIOPixelFormat::Uyvy8:
+	default:
+		return bmdFormat8BitYUV;
+	}
+}
+
+VideoIOPixelFormat VideoIOPixelFormatFromDeckLink(BMDPixelFormat format)
+{
+	if (format == bmdFormat10BitYUV)
+		return VideoIOPixelFormat::V210;
+	if (format == bmdFormat10BitYUVA)
+		return VideoIOPixelFormat::Yuva10;
+	if (format == bmdFormat8BitBGRA)
+		return VideoIOPixelFormat::Bgra8;
+	return VideoIOPixelFormat::Uyvy8;
+}

src/video/DeckLinkVideoIOFormat.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "DeckLinkAPI_h.h"
+#include "VideoIOFormat.h"
+
+BMDPixelFormat DeckLinkPixelFormatForVideoIO(VideoIOPixelFormat format);
+VideoIOPixelFormat VideoIOPixelFormatFromDeckLink(BMDPixelFormat format);

src/video/OutputProductionController.cpp

@@ -0,0 +1,89 @@
+#include "OutputProductionController.h"
+
+#include <algorithm>
+
+namespace
+{
+std::size_t ClampReadyLimit(unsigned value, std::size_t capacity)
+{
+	const std::size_t requested = static_cast<std::size_t>(value);
+	if (capacity == 0)
+		return requested;
+	return (std::min)(requested, capacity);
+}
+}
+
+OutputProductionController::OutputProductionController(const VideoPlayoutPolicy& policy) :
+	mPolicy(NormalizeVideoPlayoutPolicy(policy))
+{
+}
+
+void OutputProductionController::Configure(const VideoPlayoutPolicy& policy)
+{
+	mPolicy = NormalizeVideoPlayoutPolicy(policy);
+}
+
+OutputProductionDecision OutputProductionController::Decide(const OutputProductionPressure& pressure) const
+{
+	OutputProductionDecision decision;
+
+	const std::size_t configuredMaxReadyFrames = static_cast<std::size_t>(mPolicy.maxReadyFrames);
+	const std::size_t effectiveMaxReadyFrames = pressure.readyQueueCapacity > 0
+		? (std::min)(configuredMaxReadyFrames, pressure.readyQueueCapacity)
+		: configuredMaxReadyFrames;
+	const std::size_t effectiveTargetReadyFrames = (std::min)(
+		ClampReadyLimit(mPolicy.targetReadyFrames, pressure.readyQueueCapacity),
+		effectiveMaxReadyFrames);
+
+	decision.targetReadyFrames = effectiveTargetReadyFrames;
+	decision.maxReadyFrames = effectiveMaxReadyFrames;
+
+	if (effectiveMaxReadyFrames == 0)
+	{
+		decision.action = OutputProductionAction::Throttle;
+		decision.reason = "no-ready-frame-capacity";
+		return decision;
+	}
+
+	if (pressure.readyQueueDepth >= effectiveMaxReadyFrames)
+	{
+		decision.action = OutputProductionAction::Throttle;
+		decision.reason = "ready-queue-full";
+		return decision;
+	}
+
+	if (pressure.readyQueueDepth < effectiveTargetReadyFrames)
+	{
+		decision.action = OutputProductionAction::Produce;
+		decision.requestedFrames = effectiveTargetReadyFrames - pressure.readyQueueDepth;
+		decision.reason = "ready-queue-below-target";
+		return decision;
+	}
+
+	if ((pressure.lateStreak > 0 || pressure.dropStreak > 0 || pressure.readyQueueUnderrunCount > 0) &&
+		pressure.readyQueueDepth < effectiveMaxReadyFrames)
+	{
+		decision.action = OutputProductionAction::Produce;
+		decision.requestedFrames = 1;
+		decision.reason = "playout-pressure";
+		return decision;
+	}
+
+	decision.action = OutputProductionAction::Wait;
+	decision.reason = "ready-queue-at-target";
+	return decision;
+}
+
+const char* OutputProductionActionName(OutputProductionAction action)
+{
+	switch (action)
+	{
+	case OutputProductionAction::Produce:
+		return "Produce";
+	case OutputProductionAction::Throttle:
+		return "Throttle";
+	case OutputProductionAction::Wait:
+	default:
+		return "Wait";
+	}
+}

src/video/OutputProductionController.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "VideoPlayoutPolicy.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+enum class OutputProductionAction
+{
+	Produce,
+	Wait,
+	Throttle
+};
+
+struct OutputProductionPressure
+{
+	std::size_t readyQueueDepth = 0;
+	std::size_t readyQueueCapacity = 0;
+	uint64_t readyQueueUnderrunCount = 0;
+	uint64_t lateStreak = 0;
+	uint64_t dropStreak = 0;
+};
+
+struct OutputProductionDecision
+{
+	OutputProductionAction action = OutputProductionAction::Wait;
+	std::size_t requestedFrames = 0;
+	std::size_t targetReadyFrames = 0;
+	std::size_t maxReadyFrames = 0;
+	std::string reason;
+};
+
+class OutputProductionController
+{
+public:
+	explicit OutputProductionController(const VideoPlayoutPolicy& policy = VideoPlayoutPolicy());
+
+	void Configure(const VideoPlayoutPolicy& policy);
+	OutputProductionDecision Decide(const OutputProductionPressure& pressure) const;
+
+private:
+	VideoPlayoutPolicy mPolicy;
+};
+
+const char* OutputProductionActionName(OutputProductionAction action);

src/video/RenderCadenceController.cpp

@@ -0,0 +1,102 @@
+#include "RenderCadenceController.h"
+
+#include <algorithm>
+#include <cmath>
+
+void RenderCadenceController::Configure(Duration targetFrameDuration, TimePoint firstRenderTime, const RenderCadencePolicy& policy)
+{
+	mTargetFrameDuration = IsPositive(targetFrameDuration) ? targetFrameDuration : std::chrono::milliseconds(1);
+	mPolicy = policy;
+	if (mPolicy.skipThresholdFrames < 1.0)
+		mPolicy.skipThresholdFrames = 1.0;
+	Reset(firstRenderTime);
+}
+
+void RenderCadenceController::Reset(TimePoint firstRenderTime)
+{
+	mNextRenderTime = firstRenderTime;
+	mNextFrameIndex = 0;
+	mMetrics = RenderCadenceMetrics();
+}
+
+RenderCadenceDecision RenderCadenceController::Tick(TimePoint now)
+{
+	RenderCadenceDecision decision;
+	decision.frameIndex = mNextFrameIndex;
+	decision.renderTargetTime = mNextRenderTime;
+	decision.nextRenderTime = mNextRenderTime;
+
+	if (now < mNextRenderTime)
+	{
+		decision.action = RenderCadenceAction::Wait;
+		decision.waitDuration = mNextRenderTime - now;
+		decision.reason = "waiting-for-next-render-tick";
+		return decision;
+	}
+
+	const Duration lateness = now - mNextRenderTime;
+	const uint64_t skippedTicks = SkippedTicksForLateness(lateness);
+	if (skippedTicks > 0)
+	{
+		decision.skippedTicks = skippedTicks;
+		decision.frameIndex = mNextFrameIndex + skippedTicks;
+		decision.renderTargetTime = mNextRenderTime + (mTargetFrameDuration * skippedTicks);
+		decision.reason = "late-skip-render-ticks";
+		mMetrics.skippedTickCount += skippedTicks;
+	}
+	else
+	{
+		decision.reason = IsPositive(lateness) ? "late-render-now" : "on-time-render";
+	}
+
+	decision.action = RenderCadenceAction::Render;
+	decision.lateness = now > decision.renderTargetTime
+		? now - decision.renderTargetTime
+		: Duration::zero();
+	mNextFrameIndex = decision.frameIndex + 1;
+	mNextRenderTime = decision.renderTargetTime + mTargetFrameDuration;
+	decision.nextRenderTime = mNextRenderTime;
+
+	++mMetrics.renderedFrameCount;
+	mMetrics.nextFrameIndex = mNextFrameIndex;
+	mMetrics.lastLateness = decision.lateness;
+	if (IsPositive(decision.lateness))
+	{
+		++mMetrics.lateFrameCount;
+		mMetrics.maxLateness = (std::max)(mMetrics.maxLateness, decision.lateness);
+	}
+
+	return decision;
+}
+
+uint64_t RenderCadenceController::SkippedTicksForLateness(Duration lateness) const
+{
+	if (!mPolicy.skipLateTicks || !IsPositive(lateness) || !IsPositive(mTargetFrameDuration))
+		return 0;
+
+	const double lateFrames = static_cast<double>(lateness.count()) / static_cast<double>(mTargetFrameDuration.count());
+	if (lateFrames < mPolicy.skipThresholdFrames)
+		return 0;
+
+	const uint64_t elapsedTicks = static_cast<uint64_t>(std::floor(lateFrames));
+	if (elapsedTicks == 0)
+		return 0;
+	return (std::min)(elapsedTicks, mPolicy.maxSkippedTicksPerDecision);
+}
+
+bool RenderCadenceController::IsPositive(Duration duration)
+{
+	return duration > Duration::zero();
+}
+
+const char* RenderCadenceActionName(RenderCadenceAction action)
+{
+	switch (action)
+	{
+	case RenderCadenceAction::Render:
+		return "Render";
+	case RenderCadenceAction::Wait:
+	default:
+		return "Wait";
+	}
+}

src/video/RenderCadenceController.h

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <chrono>
+#include <cstdint>
+
+enum class RenderCadenceAction
+{
+	Wait,
+	Render
+};
+
+struct RenderCadencePolicy
+{
+	bool skipLateTicks = true;
+	uint64_t maxSkippedTicksPerDecision = 4;
+	double skipThresholdFrames = 2.0;
+};
+
+struct RenderCadenceDecision
+{
+	RenderCadenceAction action = RenderCadenceAction::Wait;
+	uint64_t frameIndex = 0;
+	uint64_t skippedTicks = 0;
+	std::chrono::steady_clock::time_point renderTargetTime;
+	std::chrono::steady_clock::time_point nextRenderTime;
+	std::chrono::steady_clock::duration waitDuration = std::chrono::steady_clock::duration::zero();
+	std::chrono::steady_clock::duration lateness = std::chrono::steady_clock::duration::zero();
+	const char* reason = "waiting-for-next-render-tick";
+};
+
+struct RenderCadenceMetrics
+{
+	uint64_t nextFrameIndex = 0;
+	uint64_t renderedFrameCount = 0;
+	uint64_t skippedTickCount = 0;
+	uint64_t lateFrameCount = 0;
+	std::chrono::steady_clock::duration lastLateness = std::chrono::steady_clock::duration::zero();
+	std::chrono::steady_clock::duration maxLateness = std::chrono::steady_clock::duration::zero();
+};
+
+class RenderCadenceController
+{
+public:
+	using Clock = std::chrono::steady_clock;
+	using TimePoint = Clock::time_point;
+	using Duration = Clock::duration;
+
+	void Configure(Duration targetFrameDuration, TimePoint firstRenderTime, const RenderCadencePolicy& policy = RenderCadencePolicy());
+	void Reset(TimePoint firstRenderTime);
+	RenderCadenceDecision Tick(TimePoint now);
+
+	Duration TargetFrameDuration() const { return mTargetFrameDuration; }
+	TimePoint NextRenderTime() const { return mNextRenderTime; }
+	uint64_t NextFrameIndex() const { return mNextFrameIndex; }
+	const RenderCadenceMetrics& Metrics() const { return mMetrics; }
+
+private:
+	uint64_t SkippedTicksForLateness(Duration lateness) const;
+	static bool IsPositive(Duration duration);
+
+	Duration mTargetFrameDuration = std::chrono::milliseconds(16);
+	TimePoint mNextRenderTime;
+	uint64_t mNextFrameIndex = 0;
+	RenderCadencePolicy mPolicy;
+	RenderCadenceMetrics mMetrics;
+};
+
+const char* RenderCadenceActionName(RenderCadenceAction action);

src/video/RenderOutputQueue.cpp

@@ -0,0 +1,93 @@
+#include "RenderOutputQueue.h"
+
+RenderOutputQueue::RenderOutputQueue(const VideoPlayoutPolicy& policy) :
+	mPolicy(NormalizeVideoPlayoutPolicy(policy))
+{
+}
+
+void RenderOutputQueue::Configure(const VideoPlayoutPolicy& policy)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mPolicy = NormalizeVideoPlayoutPolicy(policy);
+	while (mReadyFrames.size() > CapacityLocked())
+	{
+		ReleaseFrame(mReadyFrames.front());
+		mReadyFrames.pop_front();
+		++mDroppedCount;
+	}
+}
+
+bool RenderOutputQueue::Push(RenderOutputFrame frame)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.size() >= CapacityLocked())
+	{
+		ReleaseFrame(mReadyFrames.front());
+		mReadyFrames.pop_front();
+		++mDroppedCount;
+	}
+
+	mReadyFrames.push_back(frame);
+	++mPushedCount;
+	return true;
+}
+
+bool RenderOutputQueue::TryPop(RenderOutputFrame& frame)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.empty())
+	{
+		++mUnderrunCount;
+		return false;
+	}
+
+	frame = mReadyFrames.front();
+	mReadyFrames.pop_front();
+	++mPoppedCount;
+	return true;
+}
+
+bool RenderOutputQueue::DropOldestFrame()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (mReadyFrames.empty())
+		return false;
+
+	ReleaseFrame(mReadyFrames.front());
+	mReadyFrames.pop_front();
+	++mDroppedCount;
+	return true;
+}
+
+void RenderOutputQueue::Clear()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (RenderOutputFrame& frame : mReadyFrames)
+		ReleaseFrame(frame);
+	mReadyFrames.clear();
+}
+
+RenderOutputQueueMetrics RenderOutputQueue::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	RenderOutputQueueMetrics metrics;
+	metrics.depth = mReadyFrames.size();
+	metrics.capacity = CapacityLocked();
+	metrics.pushedCount = mPushedCount;
+	metrics.poppedCount = mPoppedCount;
+	metrics.droppedCount = mDroppedCount;
+	metrics.underrunCount = mUnderrunCount;
+	return metrics;
+}
+
+std::size_t RenderOutputQueue::CapacityLocked() const
+{
+	return static_cast<std::size_t>(mPolicy.maxReadyFrames);
+}
+
+void RenderOutputQueue::ReleaseFrame(RenderOutputFrame& frame)
+{
+	if (frame.releaseFrame)
+		frame.releaseFrame(frame.frame);
+	frame.releaseFrame = {};
+}

src/video/RenderOutputQueue.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+
+#include <cstdint>
+#include <deque>
+#include <functional>
+#include <mutex>
+
+struct RenderOutputFrame
+{
+	VideoIOOutputFrame frame;
+	uint64_t frameIndex = 0;
+	bool stale = false;
+	std::function<void(VideoIOOutputFrame& frame)> releaseFrame;
+};
+
+struct RenderOutputQueueMetrics
+{
+	std::size_t depth = 0;
+	std::size_t capacity = 0;
+	uint64_t pushedCount = 0;
+	uint64_t poppedCount = 0;
+	uint64_t droppedCount = 0;
+	uint64_t underrunCount = 0;
+};
+
+class RenderOutputQueue
+{
+public:
+	explicit RenderOutputQueue(const VideoPlayoutPolicy& policy = VideoPlayoutPolicy());
+
+	void Configure(const VideoPlayoutPolicy& policy);
+	bool Push(RenderOutputFrame frame);
+	bool TryPop(RenderOutputFrame& frame);
+	bool DropOldestFrame();
+	void Clear();
+	RenderOutputQueueMetrics GetMetrics() const;
+
+private:
+	std::size_t CapacityLocked() const;
+	static void ReleaseFrame(RenderOutputFrame& frame);
+
+	mutable std::mutex mMutex;
+	VideoPlayoutPolicy mPolicy;
+	std::deque<RenderOutputFrame> mReadyFrames;
+	uint64_t mPushedCount = 0;
+	uint64_t mPoppedCount = 0;
+	uint64_t mDroppedCount = 0;
+	uint64_t mUnderrunCount = 0;
+};

src/video/SystemOutputFramePool.cpp

@@ -0,0 +1,260 @@
+#include "SystemOutputFramePool.h"
+
+#include <algorithm>
+
+namespace
+{
+SystemOutputFramePoolConfig NormalizeConfig(SystemOutputFramePoolConfig config)
+{
+	if (config.rowBytes == 0)
+		config.rowBytes = VideoIORowBytes(config.pixelFormat, config.width);
+	return config;
+}
+}
+
+SystemOutputFramePool::SystemOutputFramePool(const SystemOutputFramePoolConfig& config)
+{
+	Configure(config);
+}
+
+void SystemOutputFramePool::Configure(const SystemOutputFramePoolConfig& config)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mConfig = NormalizeConfig(config);
+	mReadySlots.clear();
+	mSlots.clear();
+	mSlots.resize(mConfig.capacity);
+
+	const std::size_t byteCount = FrameByteCount();
+	for (StoredSlot& slot : mSlots)
+	{
+		slot.bytes.resize(byteCount);
+		slot.state = OutputFrameSlotState::Free;
+		++slot.generation;
+	}
+
+	mAcquireMissCount = 0;
+	mReadyUnderrunCount = 0;
+}
+
+SystemOutputFramePoolConfig SystemOutputFramePool::Config() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return mConfig;
+}
+
+bool SystemOutputFramePool::AcquireFreeSlot(OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (mSlots[index].state != OutputFrameSlotState::Free)
+			continue;
+
+		mSlots[index].state = OutputFrameSlotState::Rendering;
+		++mSlots[index].generation;
+		FillOutputSlotLocked(index, slot);
+		return true;
+	}
+
+	slot = OutputFrameSlot();
+	++mAcquireMissCount;
+	return false;
+}
+
+bool SystemOutputFramePool::AcquireRenderingSlot(OutputFrameSlot& slot)
+{
+	return AcquireFreeSlot(slot);
+}
+
+bool SystemOutputFramePool::PublishReadySlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!TransitionSlotLocked(slot, OutputFrameSlotState::Rendering, OutputFrameSlotState::Completed))
+		return false;
+
+	mReadySlots.push_back(slot.index);
+	return true;
+}
+
+bool SystemOutputFramePool::PublishCompletedSlot(const OutputFrameSlot& slot)
+{
+	return PublishReadySlot(slot);
+}
+
+bool SystemOutputFramePool::ConsumeReadySlot(OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	while (!mReadySlots.empty())
+	{
+		const std::size_t index = mReadySlots.front();
+		mReadySlots.pop_front();
+		if (index >= mSlots.size() || mSlots[index].state != OutputFrameSlotState::Completed)
+			continue;
+
+		FillOutputSlotLocked(index, slot);
+		return true;
+	}
+
+	slot = OutputFrameSlot();
+	++mReadyUnderrunCount;
+	return false;
+}
+
+bool SystemOutputFramePool::ConsumeCompletedSlot(OutputFrameSlot& slot)
+{
+	return ConsumeReadySlot(slot);
+}
+
+bool SystemOutputFramePool::MarkScheduled(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!IsValidSlotLocked(slot))
+		return false;
+	if (mSlots[slot.index].state != OutputFrameSlotState::Completed)
+		return false;
+
+	RemoveReadyIndexLocked(slot.index);
+	mSlots[slot.index].state = OutputFrameSlotState::Scheduled;
+	return true;
+}
+
+bool SystemOutputFramePool::MarkScheduledByBuffer(void* bytes)
+{
+	if (bytes == nullptr)
+		return false;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (mSlots[index].bytes.empty() || mSlots[index].bytes.data() != bytes)
+			continue;
+		if (mSlots[index].state != OutputFrameSlotState::Completed)
+			return false;
+
+		RemoveReadyIndexLocked(index);
+		mSlots[index].state = OutputFrameSlotState::Scheduled;
+		return true;
+	}
+	return false;
+}
+
+bool SystemOutputFramePool::ReleaseSlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	if (!IsValidSlotLocked(slot) || mSlots[slot.index].state == OutputFrameSlotState::Free)
+		return false;
+
+	return ReleaseSlotByIndexLocked(slot.index);
+}
+
+bool SystemOutputFramePool::ReleaseScheduledSlot(const OutputFrameSlot& slot)
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	return TransitionSlotLocked(slot, OutputFrameSlotState::Scheduled, OutputFrameSlotState::Free);
+}
+
+bool SystemOutputFramePool::ReleaseSlotByBuffer(void* bytes)
+{
+	if (bytes == nullptr)
+		return false;
+
+	std::lock_guard<std::mutex> lock(mMutex);
+	for (std::size_t index = 0; index < mSlots.size(); ++index)
+	{
+		if (!mSlots[index].bytes.empty() && mSlots[index].bytes.data() == bytes)
+			return ReleaseSlotByIndexLocked(index);
+	}
+	return false;
+}
+
+void SystemOutputFramePool::Clear()
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	mReadySlots.clear();
+	for (StoredSlot& slot : mSlots)
+	{
+		slot.state = OutputFrameSlotState::Free;
+		++slot.generation;
+	}
+}
+
+SystemOutputFramePoolMetrics SystemOutputFramePool::GetMetrics() const
+{
+	std::lock_guard<std::mutex> lock(mMutex);
+	SystemOutputFramePoolMetrics metrics;
+	metrics.capacity = mSlots.size();
+	metrics.readyCount = mReadySlots.size();
+	metrics.acquireMissCount = mAcquireMissCount;
+	metrics.readyUnderrunCount = mReadyUnderrunCount;
+
+	for (const StoredSlot& slot : mSlots)
+	{
+		switch (slot.state)
+		{
+		case OutputFrameSlotState::Free:
+			++metrics.freeCount;
+			break;
+		case OutputFrameSlotState::Rendering:
+			++metrics.renderingCount;
+			++metrics.acquiredCount;
+			break;
+		case OutputFrameSlotState::Completed:
+			++metrics.completedCount;
+			break;
+		case OutputFrameSlotState::Scheduled:
+			++metrics.scheduledCount;
+			break;
+		}
+	}
+
+	return metrics;
+}
+
+bool SystemOutputFramePool::IsValidSlotLocked(const OutputFrameSlot& slot) const
+{
+	return slot.index < mSlots.size() && mSlots[slot.index].generation == slot.generation;
+}
+
+bool SystemOutputFramePool::TransitionSlotLocked(const OutputFrameSlot& slot, OutputFrameSlotState expectedState, OutputFrameSlotState nextState)
+{
+	if (!IsValidSlotLocked(slot) || mSlots[slot.index].state != expectedState)
+		return false;
+
+	mSlots[slot.index].state = nextState;
+	return true;
+}
+
+void SystemOutputFramePool::FillOutputSlotLocked(std::size_t index, OutputFrameSlot& slot)
+{
+	StoredSlot& storedSlot = mSlots[index];
+	slot.index = index;
+	slot.generation = storedSlot.generation;
+	slot.frame.bytes = storedSlot.bytes.empty() ? nullptr : storedSlot.bytes.data();
+	slot.frame.rowBytes = static_cast<long>(mConfig.rowBytes);
+	slot.frame.width = mConfig.width;
+	slot.frame.height = mConfig.height;
+	slot.frame.pixelFormat = mConfig.pixelFormat;
+	slot.frame.nativeFrame = nullptr;
+	slot.frame.nativeBuffer = slot.frame.bytes;
+}
+
+void SystemOutputFramePool::RemoveReadyIndexLocked(std::size_t index)
+{
+	mReadySlots.erase(std::remove(mReadySlots.begin(), mReadySlots.end(), index), mReadySlots.end());
+}
+
+bool SystemOutputFramePool::ReleaseSlotByIndexLocked(std::size_t index)
+{
+	if (index >= mSlots.size() || mSlots[index].state == OutputFrameSlotState::Free)
+		return false;
+
+	RemoveReadyIndexLocked(index);
+	mSlots[index].state = OutputFrameSlotState::Free;
+	return true;
+}
+
+std::size_t SystemOutputFramePool::FrameByteCount() const
+{
+	return static_cast<std::size_t>(mConfig.rowBytes) * static_cast<std::size_t>(mConfig.height);
+}

src/video/SystemOutputFramePool.h

@@ -0,0 +1,94 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <mutex>
+#include <vector>
+
+enum class OutputFrameSlotState
+{
+	Free,
+	Rendering,
+	Completed,
+	Scheduled
+};
+
+struct SystemOutputFramePoolConfig
+{
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Bgra8;
+	unsigned rowBytes = 0;
+	std::size_t capacity = 0;
+};
+
+struct OutputFrameSlot
+{
+	VideoIOOutputFrame frame;
+	std::size_t index = 0;
+	uint64_t generation = 0;
+};
+
+struct SystemOutputFramePoolMetrics
+{
+	std::size_t capacity = 0;
+	std::size_t freeCount = 0;
+	std::size_t renderingCount = 0;
+	std::size_t completedCount = 0;
+	std::size_t scheduledCount = 0;
+	std::size_t acquiredCount = 0;
+	std::size_t readyCount = 0;
+	std::size_t consumedCount = 0;
+	uint64_t acquireMissCount = 0;
+	uint64_t readyUnderrunCount = 0;
+};
+
+class SystemOutputFramePool
+{
+public:
+	SystemOutputFramePool() = default;
+	explicit SystemOutputFramePool(const SystemOutputFramePoolConfig& config);
+
+	void Configure(const SystemOutputFramePoolConfig& config);
+	SystemOutputFramePoolConfig Config() const;
+
+	bool AcquireFreeSlot(OutputFrameSlot& slot);
+	bool AcquireRenderingSlot(OutputFrameSlot& slot);
+	bool PublishReadySlot(const OutputFrameSlot& slot);
+	bool PublishCompletedSlot(const OutputFrameSlot& slot);
+	bool ConsumeReadySlot(OutputFrameSlot& slot);
+	bool ConsumeCompletedSlot(OutputFrameSlot& slot);
+	bool MarkScheduled(const OutputFrameSlot& slot);
+	bool MarkScheduledByBuffer(void* bytes);
+	bool ReleaseSlot(const OutputFrameSlot& slot);
+	bool ReleaseScheduledSlot(const OutputFrameSlot& slot);
+	bool ReleaseSlotByBuffer(void* bytes);
+	void Clear();
+
+	SystemOutputFramePoolMetrics GetMetrics() const;
+
+private:
+	struct StoredSlot
+	{
+		std::vector<unsigned char> bytes;
+		OutputFrameSlotState state = OutputFrameSlotState::Free;
+		uint64_t generation = 1;
+	};
+
+	bool IsValidSlotLocked(const OutputFrameSlot& slot) const;
+	bool TransitionSlotLocked(const OutputFrameSlot& slot, OutputFrameSlotState expectedState, OutputFrameSlotState nextState);
+	void FillOutputSlotLocked(std::size_t index, OutputFrameSlot& slot);
+	void RemoveReadyIndexLocked(std::size_t index);
+	bool ReleaseSlotByIndexLocked(std::size_t index);
+	std::size_t FrameByteCount() const;
+
+	mutable std::mutex mMutex;
+	SystemOutputFramePoolConfig mConfig;
+	std::vector<StoredSlot> mSlots;
+	std::deque<std::size_t> mReadySlots;
+	uint64_t mAcquireMissCount = 0;
+	uint64_t mReadyUnderrunCount = 0;
+};

src/video/VideoBackend.h

@@ -0,0 +1,161 @@
+#pragma once
+
+#include "OutputProductionController.h"
+#include "RenderCadenceController.h"
+#include "RenderOutputQueue.h"
+#include "SystemOutputFramePool.h"
+#include "VideoBackendLifecycle.h"
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+
+#include <chrono>
+#include <condition_variable>
+#include <cstdint>
+#include <deque>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+
+class HealthTelemetry;
+class OpenGLVideoIOBridge;
+class RenderEngine;
+class RuntimeEventDispatcher;
+class VideoIODevice;
+
+class VideoBackend
+{
+public:
+	VideoBackend(RenderEngine& renderEngine, HealthTelemetry& healthTelemetry, RuntimeEventDispatcher& runtimeEventDispatcher);
+	~VideoBackend();
+
+	void ReleaseResources();
+	VideoBackendLifecycleState LifecycleState() const;
+	bool DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error);
+	bool SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error);
+	bool ConfigureInput(const VideoFormat& inputVideoMode, std::string& error);
+	bool ConfigureOutput(const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error);
+	bool Start();
+	bool Stop();
+
+	const VideoIOState& State() const;
+	VideoIOState& MutableState();
+	bool BeginOutputFrame(VideoIOOutputFrame& frame);
+	void EndOutputFrame(VideoIOOutputFrame& frame);
+	bool ScheduleOutputFrame(const VideoIOOutputFrame& frame);
+	VideoPlayoutRecoveryDecision AccountForCompletionResult(VideoIOCompletionResult result, uint64_t readyQueueDepth);
+	void RecordBackendPlayoutHealth(VideoIOCompletionResult result, const VideoPlayoutRecoveryDecision& recoveryDecision);
+
+	bool HasInputDevice() const;
+	bool HasInputSource() const;
+	unsigned InputFrameWidth() const;
+	unsigned InputFrameHeight() const;
+	unsigned OutputFrameWidth() const;
+	unsigned OutputFrameHeight() const;
+	unsigned CaptureTextureWidth() const;
+	unsigned OutputPackTextureWidth() const;
+	VideoIOPixelFormat InputPixelFormat() const;
+	const std::string& InputDisplayModeName() const;
+	const std::string& OutputModelName() const;
+	bool SupportsInternalKeying() const;
+	bool SupportsExternalKeying() const;
+	bool KeyerInterfaceAvailable() const;
+	bool ExternalKeyingActive() const;
+	const std::string& StatusMessage() const;
+	bool ShouldPrioritizeOutputOverPreview() const;
+	void SetStatusMessage(const std::string& message);
+	void PublishStatus(bool externalKeyingConfigured, const std::string& statusMessage = std::string());
+	void ReportNoInputDeviceSignalStatus();
+
+private:
+	void HandleInputFrame(const VideoIOFrame& frame);
+	void HandleOutputFrameCompletion(const VideoIOCompletion& completion);
+	void StartOutputCompletionWorker();
+	void StopOutputCompletionWorker();
+	void OutputCompletionWorkerMain();
+	void StartOutputProducerWorker();
+	void StopOutputProducerWorker();
+	void OutputProducerWorkerMain();
+	void NotifyOutputProducer();
+	bool WarmupOutputPreroll();
+	std::chrono::milliseconds OutputProducerWakeInterval() const;
+	void ProcessOutputFrameCompletion(const VideoIOCompletion& completion);
+	std::size_t ProduceReadyOutputFrames(const VideoIOCompletion& completion, std::size_t maxFrames);
+	OutputProductionPressure BuildOutputProductionPressure(const RenderOutputQueueMetrics& metrics) const;
+	bool RenderReadyOutputFrame(const VideoIOState& state, const VideoIOCompletion& completion);
+	std::size_t ScheduleReadyOutputFramesToTarget();
+	bool ScheduleReadyOutputFrame();
+	bool ScheduleBlackUnderrunFrame();
+	void RecordFramePacing(VideoIOCompletionResult completionResult);
+	void RecordReadyQueueDepthSample(const RenderOutputQueueMetrics& metrics);
+	void RecordDeckLinkBufferTelemetry();
+	void RecordSystemMemoryPlayoutStats();
+	void RecordOutputRenderDuration(double renderMilliseconds, double acquireMilliseconds, double renderRequestMilliseconds, double endAccessMilliseconds);
+	bool ApplyLifecycleTransition(VideoBackendLifecycleState state, const std::string& message);
+	bool ApplyLifecycleFailure(const std::string& message);
+	void PublishBackendStateChanged(const std::string& state, const std::string& message);
+	void PublishInputSignalChanged(const VideoIOFrame& frame, const VideoIOState& state);
+	void PublishInputFrameArrived(const VideoIOFrame& frame);
+	void PublishOutputFrameScheduled(const VideoIOOutputFrame& frame);
+	void PublishOutputFrameCompleted(const VideoIOCompletion& completion);
+	void PublishTimingSample(const std::string& subsystem, const std::string& metric, double value, const std::string& unit);
+	static std::string CompletionResultName(VideoIOCompletionResult result);
+	static std::string PixelFormatName(VideoIOPixelFormat pixelFormat);
+	static bool IsEnvironmentFlagEnabled(const char* name);
+
+	HealthTelemetry& mHealthTelemetry;
+	RuntimeEventDispatcher& mRuntimeEventDispatcher;
+	VideoBackendLifecycle mLifecycle;
+	VideoPlayoutPolicy mPlayoutPolicy;
+	OutputProductionController mOutputProductionController;
+	RenderCadenceController mRenderCadenceController;
+	RenderOutputQueue mReadyOutputQueue;
+	SystemOutputFramePool mSystemOutputFramePool;
+	std::unique_ptr<VideoIODevice> mVideoIODevice;
+	std::unique_ptr<OpenGLVideoIOBridge> mBridge;
+	std::mutex mOutputCompletionMutex;
+	std::condition_variable mOutputCompletionCondition;
+	std::deque<VideoIOCompletion> mPendingOutputCompletions;
+	std::thread mOutputCompletionWorker;
+	std::mutex mOutputProducerMutex;
+	std::condition_variable mOutputProducerCondition;
+	std::thread mOutputProducerWorker;
+	VideoIOCompletion mLastOutputProductionCompletion;
+	std::chrono::steady_clock::time_point mLastOutputProductionTime;
+	std::mutex mOutputProductionMutex;
+	std::mutex mOutputSchedulingMutex;
+	mutable std::mutex mOutputMetricsMutex;
+	bool mOutputCompletionWorkerRunning = false;
+	bool mOutputCompletionWorkerStopping = false;
+	bool mOutputProducerWorkerRunning = false;
+	bool mOutputProducerWorkerStopping = false;
+	bool mInputCaptureDisabled = false;
+	uint64_t mNextReadyOutputFrameIndex = 0;
+	uint64_t mInputFrameIndex = 0;
+	uint64_t mOutputFrameScheduleIndex = 0;
+	uint64_t mOutputFrameCompletionIndex = 0;
+	bool mHasLastInputSignal = false;
+	bool mLastInputSignal = false;
+	unsigned mLastInputSignalWidth = 0;
+	unsigned mLastInputSignalHeight = 0;
+	std::string mLastInputSignalModeName;
+	std::chrono::steady_clock::time_point mLastPlayoutCompletionTime;
+	double mCompletionIntervalMilliseconds = 0.0;
+	double mSmoothedCompletionIntervalMilliseconds = 0.0;
+	double mMaxCompletionIntervalMilliseconds = 0.0;
+	bool mHasReadyQueueDepthBaseline = false;
+	std::size_t mMinReadyQueueDepth = 0;
+	std::size_t mMaxReadyQueueDepth = 0;
+	uint64_t mReadyQueueZeroDepthCount = 0;
+	double mOutputRenderMilliseconds = 0.0;
+	double mSmoothedOutputRenderMilliseconds = 0.0;
+	double mMaxOutputRenderMilliseconds = 0.0;
+	double mOutputFrameAcquireMilliseconds = 0.0;
+	double mOutputFrameRenderRequestMilliseconds = 0.0;
+	double mOutputFrameEndAccessMilliseconds = 0.0;
+	uint64_t mLastLateStreak = 0;
+	uint64_t mLastDropStreak = 0;
+	uint64_t mLateFrameCount = 0;
+	uint64_t mDroppedFrameCount = 0;
+	uint64_t mFlushedFrameCount = 0;
+};

src/video/VideoBackendLifecycle.cpp

@@ -0,0 +1,123 @@
+#include "VideoBackendLifecycle.h"
+
+VideoBackendLifecycleState VideoBackendLifecycle::State() const
+{
+	return mState;
+}
+
+const std::string& VideoBackendLifecycle::FailureReason() const
+{
+	return mFailureReason;
+}
+
+VideoBackendLifecycleTransition VideoBackendLifecycle::TransitionTo(VideoBackendLifecycleState next, const std::string& reason)
+{
+	VideoBackendLifecycleTransition transition;
+	transition.previous = mState;
+	transition.current = next;
+	transition.reason = reason;
+	transition.accepted = CanTransition(mState, next);
+	if (!transition.accepted)
+	{
+		transition.current = mState;
+		transition.errorMessage = std::string("Invalid video backend lifecycle transition from ") +
+			StateName(mState) + " to " + StateName(next) + ".";
+		return transition;
+	}
+
+	mState = next;
+	transition.current = mState;
+	if (mState != VideoBackendLifecycleState::Failed)
+		mFailureReason.clear();
+	return transition;
+}
+
+VideoBackendLifecycleTransition VideoBackendLifecycle::Fail(const std::string& reason)
+{
+	VideoBackendLifecycleTransition transition = TransitionTo(VideoBackendLifecycleState::Failed, reason);
+	if (transition.accepted)
+		mFailureReason = reason;
+	return transition;
+}
+
+bool VideoBackendLifecycle::CanTransition(VideoBackendLifecycleState current, VideoBackendLifecycleState next)
+{
+	if (current == next)
+		return true;
+
+	switch (current)
+	{
+	case VideoBackendLifecycleState::Uninitialized:
+		return next == VideoBackendLifecycleState::Discovering ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Discovering:
+		return next == VideoBackendLifecycleState::Discovered ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Discovered:
+		return next == VideoBackendLifecycleState::Configuring ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Configuring:
+		return next == VideoBackendLifecycleState::Configured ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Configured:
+		return next == VideoBackendLifecycleState::Prerolling ||
+			next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Prerolling:
+		return next == VideoBackendLifecycleState::Running ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Running:
+		return next == VideoBackendLifecycleState::Degraded ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Degraded:
+		return next == VideoBackendLifecycleState::Running ||
+			next == VideoBackendLifecycleState::Stopping ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Stopping:
+		return next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Stopped:
+		return next == VideoBackendLifecycleState::Discovering ||
+			next == VideoBackendLifecycleState::Failed;
+	case VideoBackendLifecycleState::Failed:
+		return next == VideoBackendLifecycleState::Stopped ||
+			next == VideoBackendLifecycleState::Discovering;
+	default:
+		return false;
+	}
+}
+
+const char* VideoBackendLifecycle::StateName(VideoBackendLifecycleState state)
+{
+	switch (state)
+	{
+	case VideoBackendLifecycleState::Uninitialized:
+		return "uninitialized";
+	case VideoBackendLifecycleState::Discovering:
+		return "discovering";
+	case VideoBackendLifecycleState::Discovered:
+		return "discovered";
+	case VideoBackendLifecycleState::Configuring:
+		return "configuring";
+	case VideoBackendLifecycleState::Configured:
+		return "configured";
+	case VideoBackendLifecycleState::Prerolling:
+		return "prerolling";
+	case VideoBackendLifecycleState::Running:
+		return "running";
+	case VideoBackendLifecycleState::Degraded:
+		return "degraded";
+	case VideoBackendLifecycleState::Stopping:
+		return "stopping";
+	case VideoBackendLifecycleState::Stopped:
+		return "stopped";
+	case VideoBackendLifecycleState::Failed:
+		return "failed";
+	default:
+		return "unknown";
+	}
+}

src/video/VideoBackendLifecycle.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <string>
+
+enum class VideoBackendLifecycleState
+{
+	Uninitialized,
+	Discovering,
+	Discovered,
+	Configuring,
+	Configured,
+	Prerolling,
+	Running,
+	Degraded,
+	Stopping,
+	Stopped,
+	Failed
+};
+
+struct VideoBackendLifecycleTransition
+{
+	VideoBackendLifecycleState previous = VideoBackendLifecycleState::Uninitialized;
+	VideoBackendLifecycleState current = VideoBackendLifecycleState::Uninitialized;
+	bool accepted = false;
+	std::string reason;
+	std::string errorMessage;
+};
+
+class VideoBackendLifecycle
+{
+public:
+	VideoBackendLifecycleState State() const;
+	const std::string& FailureReason() const;
+	VideoBackendLifecycleTransition TransitionTo(VideoBackendLifecycleState next, const std::string& reason);
+	VideoBackendLifecycleTransition Fail(const std::string& reason);
+
+	static bool CanTransition(VideoBackendLifecycleState current, VideoBackendLifecycleState next);
+	static const char* StateName(VideoBackendLifecycleState state);
+
+private:
+	VideoBackendLifecycleState mState = VideoBackendLifecycleState::Uninitialized;
+	std::string mFailureReason;
+};

src/video/VideoIOFormat.cpp

@@ -0,0 +1,170 @@
+#include "VideoIOFormat.h"
+
+#include <algorithm>
+#include <cmath>
+
+#ifdef min
+#undef min
+#endif
+#ifdef max
+#undef max
+#endif
+
+namespace
+{
+uint16_t Clamp10(int value, int minimum, int maximum)
+{
+	return static_cast<uint16_t>(std::max(minimum, std::min(maximum, value)));
+}
+
+uint32_t MakeV210Word(uint16_t a, uint16_t b, uint16_t c)
+{
+	return (static_cast<uint32_t>(a) & 0x3ffu)
+		| ((static_cast<uint32_t>(b) & 0x3ffu) << 10)
+		| ((static_cast<uint32_t>(c) & 0x3ffu) << 20);
+}
+
+void StoreWord(std::array<uint8_t, 16>& bytes, std::size_t wordIndex, uint32_t word)
+{
+	const std::size_t offset = wordIndex * 4;
+	bytes[offset + 0] = static_cast<uint8_t>(word & 0xffu);
+	bytes[offset + 1] = static_cast<uint8_t>((word >> 8) & 0xffu);
+	bytes[offset + 2] = static_cast<uint8_t>((word >> 16) & 0xffu);
+	bytes[offset + 3] = static_cast<uint8_t>((word >> 24) & 0xffu);
+}
+
+uint32_t LoadWord(const std::array<uint8_t, 16>& bytes, std::size_t wordIndex)
+{
+	const std::size_t offset = wordIndex * 4;
+	return static_cast<uint32_t>(bytes[offset + 0])
+		| (static_cast<uint32_t>(bytes[offset + 1]) << 8)
+		| (static_cast<uint32_t>(bytes[offset + 2]) << 16)
+		| (static_cast<uint32_t>(bytes[offset + 3]) << 24);
+}
+
+uint16_t Component(uint32_t word, unsigned index)
+{
+	return static_cast<uint16_t>((word >> (index * 10)) & 0x3ffu);
+}
+}
+
+const char* VideoIOPixelFormatName(VideoIOPixelFormat format)
+{
+	switch (format)
+	{
+	case VideoIOPixelFormat::V210:
+		return "10-bit YUV v210";
+	case VideoIOPixelFormat::Yuva10:
+		return "10-bit YUVA Ay10";
+	case VideoIOPixelFormat::Bgra8:
+		return "8-bit BGRA";
+	case VideoIOPixelFormat::Uyvy8:
+	default:
+		return "8-bit YUV UYVY";
+	}
+}
+
+bool VideoIOPixelFormatIsTenBit(VideoIOPixelFormat format)
+{
+	return format == VideoIOPixelFormat::V210 || format == VideoIOPixelFormat::Yuva10;
+}
+
+VideoIOPixelFormat ChoosePreferredVideoIOFormat(bool tenBitSupported)
+{
+	return tenBitSupported ? VideoIOPixelFormat::V210 : VideoIOPixelFormat::Uyvy8;
+}
+
+unsigned VideoIOBytesPerPixel(VideoIOPixelFormat format)
+{
+	switch (format)
+	{
+	case VideoIOPixelFormat::Uyvy8:
+		return 2u;
+	case VideoIOPixelFormat::Bgra8:
+		return 4u;
+	case VideoIOPixelFormat::Yuva10:
+		return 4u;
+	case VideoIOPixelFormat::V210:
+	default:
+		return 0u;
+	}
+}
+
+unsigned VideoIORowBytes(VideoIOPixelFormat format, unsigned frameWidth)
+{
+	if (format == VideoIOPixelFormat::V210)
+		return MinimumV210RowBytes(frameWidth);
+	if (format == VideoIOPixelFormat::Yuva10)
+		return MinimumYuva10RowBytes(frameWidth);
+	return frameWidth * VideoIOBytesPerPixel(format);
+}
+
+unsigned PackedTextureWidthFromRowBytes(unsigned rowBytes)
+{
+	return (rowBytes + 3u) / 4u;
+}
+
+unsigned MinimumV210RowBytes(unsigned frameWidth)
+{
+	return ((frameWidth + 5u) / 6u) * 16u;
+}
+
+unsigned MinimumYuva10RowBytes(unsigned frameWidth)
+{
+	return ((frameWidth + 63u) / 64u) * 256u;
+}
+
+unsigned ActiveV210WordsForWidth(unsigned frameWidth)
+{
+	return ((frameWidth + 5u) / 6u) * 4u;
+}
+
+V210CodeValues Rec709RgbToLegalV210(float red, float green, float blue)
+{
+	red = std::max(0.0f, std::min(1.0f, red));
+	green = std::max(0.0f, std::min(1.0f, green));
+	blue = std::max(0.0f, std::min(1.0f, blue));
+
+	const float y = 0.2126f * red + 0.7152f * green + 0.0722f * blue;
+	const float cb = (blue - y) / 1.8556f + 0.5f;
+	const float cr = (red - y) / 1.5748f + 0.5f;
+
+	V210CodeValues values;
+	values.y = Clamp10(static_cast<int>(std::lround(64.0f + y * 876.0f)), 64, 940);
+	values.cb = Clamp10(static_cast<int>(std::lround(64.0f + cb * 896.0f)), 64, 960);
+	values.cr = Clamp10(static_cast<int>(std::lround(64.0f + cr * 896.0f)), 64, 960);
+	return values;
+}
+
+std::array<uint8_t, 16> PackV210Block(const V210SixPixelBlock& block)
+{
+	std::array<uint8_t, 16> bytes = {};
+	StoreWord(bytes, 0, MakeV210Word(block.cb[0], block.y[0], block.cr[0]));
+	StoreWord(bytes, 1, MakeV210Word(block.y[1], block.cb[1], block.y[2]));
+	StoreWord(bytes, 2, MakeV210Word(block.cr[1], block.y[3], block.cb[2]));
+	StoreWord(bytes, 3, MakeV210Word(block.y[4], block.cr[2], block.y[5]));
+	return bytes;
+}
+
+V210SixPixelBlock UnpackV210Block(const std::array<uint8_t, 16>& bytes)
+{
+	const uint32_t word0 = LoadWord(bytes, 0);
+	const uint32_t word1 = LoadWord(bytes, 1);
+	const uint32_t word2 = LoadWord(bytes, 2);
+	const uint32_t word3 = LoadWord(bytes, 3);
+
+	V210SixPixelBlock block;
+	block.cb[0] = Component(word0, 0);
+	block.y[0] = Component(word0, 1);
+	block.cr[0] = Component(word0, 2);
+	block.y[1] = Component(word1, 0);
+	block.cb[1] = Component(word1, 1);
+	block.y[2] = Component(word1, 2);
+	block.cr[1] = Component(word2, 0);
+	block.y[3] = Component(word2, 1);
+	block.cb[2] = Component(word2, 2);
+	block.y[4] = Component(word3, 0);
+	block.cr[2] = Component(word3, 1);
+	block.y[5] = Component(word3, 2);
+	return block;
+}

src/video/VideoIOFormat.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+
+enum class VideoIOPixelFormat
+{
+	Uyvy8,
+	V210,
+	Yuva10,
+	Bgra8
+};
+
+struct V210CodeValues
+{
+	uint16_t y = 64;
+	uint16_t cb = 512;
+	uint16_t cr = 512;
+};
+
+struct V210SixPixelBlock
+{
+	std::array<uint16_t, 6> y = {};
+	std::array<uint16_t, 3> cb = {};
+	std::array<uint16_t, 3> cr = {};
+};
+
+const char* VideoIOPixelFormatName(VideoIOPixelFormat format);
+bool VideoIOPixelFormatIsTenBit(VideoIOPixelFormat format);
+VideoIOPixelFormat ChoosePreferredVideoIOFormat(bool tenBitSupported);
+unsigned VideoIOBytesPerPixel(VideoIOPixelFormat format);
+unsigned VideoIORowBytes(VideoIOPixelFormat format, unsigned frameWidth);
+unsigned PackedTextureWidthFromRowBytes(unsigned rowBytes);
+unsigned MinimumV210RowBytes(unsigned frameWidth);
+unsigned MinimumYuva10RowBytes(unsigned frameWidth);
+unsigned ActiveV210WordsForWidth(unsigned frameWidth);
+V210CodeValues Rec709RgbToLegalV210(float red, float green, float blue);
+std::array<uint8_t, 16> PackV210Block(const V210SixPixelBlock& block);
+V210SixPixelBlock UnpackV210Block(const std::array<uint8_t, 16>& bytes);

src/video/VideoIOTypes.h

@@ -0,0 +1,164 @@
+#pragma once
+
+#include "DeckLinkDisplayMode.h"
+#include "VideoIOFormat.h"
+
+#include <cstdint>
+#include <functional>
+#include <string>
+
+enum class VideoIOBackend
+{
+	DeckLink
+};
+
+enum class VideoIOCompletionResult
+{
+	Completed,
+	DisplayedLate,
+	Dropped,
+	Flushed,
+	Unknown
+};
+
+struct VideoIOConfig
+{
+	VideoFormatSelection videoModes;
+	bool externalKeyingEnabled = false;
+	bool preferTenBit = true;
+};
+
+struct VideoIOState
+{
+	FrameSize inputFrameSize;
+	FrameSize outputFrameSize;
+	VideoIOPixelFormat inputPixelFormat = VideoIOPixelFormat::Uyvy8;
+	VideoIOPixelFormat outputPixelFormat = VideoIOPixelFormat::Bgra8;
+	unsigned inputFrameRowBytes = 0;
+	unsigned outputFrameRowBytes = 0;
+	unsigned captureTextureWidth = 0;
+	unsigned outputPackTextureWidth = 0;
+	std::string inputDisplayModeName = "1080p59.94";
+	std::string outputDisplayModeName = "1080p59.94";
+	std::string outputModelName;
+	std::string statusMessage;
+	std::string formatStatusMessage;
+	bool hasInputDevice = false;
+	bool hasInputSource = false;
+	bool supportsInternalKeying = false;
+	bool supportsExternalKeying = false;
+	bool keyerInterfaceAvailable = false;
+	bool externalKeyingActive = false;
+	double frameBudgetMilliseconds = 0.0;
+	bool actualDeckLinkBufferedFramesAvailable = false;
+	uint64_t actualDeckLinkBufferedFrames = 0;
+	double deckLinkScheduleCallMilliseconds = 0.0;
+	uint64_t deckLinkScheduleFailureCount = 0;
+	bool deckLinkScheduleLeadAvailable = false;
+	int64_t deckLinkPlaybackStreamTime = 0;
+	uint64_t deckLinkPlaybackFrameIndex = 0;
+	uint64_t deckLinkNextScheduleFrameIndex = 0;
+	int64_t deckLinkScheduleLeadFrames = 0;
+	uint64_t deckLinkScheduleRealignmentCount = 0;
+};
+
+struct VideoIOFrame
+{
+	void* bytes = nullptr;
+	long rowBytes = 0;
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Uyvy8;
+	bool hasNoInputSource = false;
+};
+
+struct VideoIOOutputFrame
+{
+	void* bytes = nullptr;
+	long rowBytes = 0;
+	unsigned width = 0;
+	unsigned height = 0;
+	VideoIOPixelFormat pixelFormat = VideoIOPixelFormat::Bgra8;
+	void* nativeFrame = nullptr;
+	void* nativeBuffer = nullptr;
+};
+
+struct VideoIOCompletion
+{
+	VideoIOCompletionResult result = VideoIOCompletionResult::Completed;
+	void* outputFrameBuffer = nullptr;
+};
+
+struct VideoIOScheduleTime
+{
+	int64_t streamTime = 0;
+	int64_t duration = 0;
+	int64_t timeScale = 0;
+	uint64_t frameIndex = 0;
+};
+
+struct VideoPlayoutRecoveryDecision
+{
+	VideoIOCompletionResult result = VideoIOCompletionResult::Completed;
+	uint64_t completedFrameIndex = 0;
+	uint64_t scheduledFrameIndex = 0;
+	uint64_t readyQueueDepth = 0;
+	uint64_t scheduledLeadFrames = 0;
+	uint64_t measuredLagFrames = 0;
+	uint64_t catchUpFrames = 0;
+	uint64_t lateStreak = 0;
+	uint64_t dropStreak = 0;
+};
+
+class VideoIODevice
+{
+public:
+	using InputFrameCallback = std::function<void(const VideoIOFrame&)>;
+	using OutputFrameCallback = std::function<void(const VideoIOCompletion&)>;
+
+	virtual ~VideoIODevice() = default;
+	virtual void ReleaseResources() = 0;
+	virtual bool DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error) = 0;
+	virtual bool SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error) = 0;
+	virtual bool ConfigureInput(InputFrameCallback callback, const VideoFormat& inputVideoMode, std::string& error) = 0;
+	virtual bool ConfigureOutput(OutputFrameCallback callback, const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error) = 0;
+	virtual bool PrepareOutputSchedule() = 0;
+	virtual bool StartInputStreams() = 0;
+	virtual bool StartScheduledPlayback() = 0;
+	virtual bool Start() = 0;
+	virtual bool Stop() = 0;
+	virtual const VideoIOState& State() const = 0;
+	virtual VideoIOState& MutableState() = 0;
+	virtual bool BeginOutputFrame(VideoIOOutputFrame& frame) = 0;
+	virtual void EndOutputFrame(VideoIOOutputFrame& frame) = 0;
+	virtual bool ScheduleOutputFrame(const VideoIOOutputFrame& frame) = 0;
+	virtual VideoPlayoutRecoveryDecision AccountForCompletionResult(VideoIOCompletionResult result, uint64_t readyQueueDepth) = 0;
+
+	bool HasInputDevice() const { return State().hasInputDevice; }
+	bool HasInputSource() const { return State().hasInputSource; }
+	bool InputOutputDimensionsDiffer() const { return State().inputFrameSize != State().outputFrameSize; }
+	const FrameSize& InputFrameSize() const { return State().inputFrameSize; }
+	const FrameSize& OutputFrameSize() const { return State().outputFrameSize; }
+	unsigned InputFrameWidth() const { return State().inputFrameSize.width; }
+	unsigned InputFrameHeight() const { return State().inputFrameSize.height; }
+	unsigned OutputFrameWidth() const { return State().outputFrameSize.width; }
+	unsigned OutputFrameHeight() const { return State().outputFrameSize.height; }
+	VideoIOPixelFormat InputPixelFormat() const { return State().inputPixelFormat; }
+	VideoIOPixelFormat OutputPixelFormat() const { return State().outputPixelFormat; }
+	bool InputIsTenBit() const { return VideoIOPixelFormatIsTenBit(State().inputPixelFormat); }
+	bool OutputIsTenBit() const { return VideoIOPixelFormatIsTenBit(State().outputPixelFormat); }
+	unsigned InputFrameRowBytes() const { return State().inputFrameRowBytes; }
+	unsigned OutputFrameRowBytes() const { return State().outputFrameRowBytes; }
+	unsigned CaptureTextureWidth() const { return State().captureTextureWidth; }
+	unsigned OutputPackTextureWidth() const { return State().outputPackTextureWidth; }
+	const std::string& FormatStatusMessage() const { return State().formatStatusMessage; }
+	const std::string& InputDisplayModeName() const { return State().inputDisplayModeName; }
+	const std::string& OutputModelName() const { return State().outputModelName; }
+	bool SupportsInternalKeying() const { return State().supportsInternalKeying; }
+	bool SupportsExternalKeying() const { return State().supportsExternalKeying; }
+	bool KeyerInterfaceAvailable() const { return State().keyerInterfaceAvailable; }
+	bool ExternalKeyingActive() const { return State().externalKeyingActive; }
+	const std::string& StatusMessage() const { return State().statusMessage; }
+	double FrameBudgetMilliseconds() const { return State().frameBudgetMilliseconds; }
+	void SetStatusMessage(const std::string& message) { MutableState().statusMessage = message; }
+};

src/video/VideoPlayoutPolicy.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <cstdint>
+
+enum class VideoUnderrunBehavior
+{
+	ReuseLastCompletedFrame,
+	BlackFrame
+};
+
+struct VideoPlayoutPolicy
+{
+	unsigned outputFramePoolSize = 10;
+	unsigned targetPrerollFrames = 4;
+	unsigned targetReadyFrames = 2;
+	unsigned maxReadyFrames = 4;
+	unsigned minimumSpareDeviceFrames = 1;
+	uint64_t lateOrDropCatchUpFrames = 0;
+	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;
+	const unsigned minimumOutputFramePoolSize = policy.targetPrerollFrames + policy.maxReadyFrames + policy.minimumSpareDeviceFrames;
+	if (policy.outputFramePoolSize < minimumOutputFramePoolSize)
+		policy.outputFramePoolSize = minimumOutputFramePoolSize;
+	return policy;
+}

src/video/VideoPlayoutScheduler.cpp

@@ -0,0 +1,108 @@
+#include "VideoPlayoutScheduler.h"
+
+void VideoPlayoutScheduler::Configure(int64_t frameDuration, int64_t timeScale)
+{
+	Configure(frameDuration, timeScale, VideoPlayoutPolicy());
+}
+
+void VideoPlayoutScheduler::Configure(int64_t frameDuration, int64_t timeScale, const VideoPlayoutPolicy& policy)
+{
+	mFrameDuration = frameDuration;
+	mTimeScale = timeScale;
+	mPolicy = NormalizeVideoPlayoutPolicy(policy);
+	Reset();
+}
+
+void VideoPlayoutScheduler::Reset()
+{
+	mScheduledFrameIndex = 0;
+	mCompletedFrameIndex = 0;
+	mLateStreak = 0;
+	mDropStreak = 0;
+}
+
+VideoIOScheduleTime VideoPlayoutScheduler::NextScheduleTime()
+{
+	VideoIOScheduleTime time;
+	time.streamTime = static_cast<int64_t>(mScheduledFrameIndex) * mFrameDuration;
+	time.duration = mFrameDuration;
+	time.timeScale = mTimeScale;
+	time.frameIndex = mScheduledFrameIndex;
+	++mScheduledFrameIndex;
+	return time;
+}
+
+void VideoPlayoutScheduler::AlignNextScheduleTimeToPlayback(int64_t streamTime, uint64_t leadFrames)
+{
+	if (mFrameDuration <= 0 || streamTime < 0)
+		return;
+
+	const uint64_t playbackFrameIndex = static_cast<uint64_t>(streamTime / mFrameDuration);
+	const uint64_t minimumScheduleIndex = playbackFrameIndex + leadFrames;
+	if (minimumScheduleIndex > mScheduledFrameIndex)
+		mScheduledFrameIndex = minimumScheduleIndex;
+}
+
+VideoPlayoutRecoveryDecision VideoPlayoutScheduler::AccountForCompletionResult(VideoIOCompletionResult result, uint64_t readyQueueDepth)
+{
+	++mCompletedFrameIndex;
+	if (result == VideoIOCompletionResult::DisplayedLate)
+		++mLateStreak;
+	else
+		mLateStreak = 0;
+	if (result == VideoIOCompletionResult::Dropped)
+		++mDropStreak;
+	else
+		mDropStreak = 0;
+
+	const uint64_t measuredLagFrames = MeasureLag(result, readyQueueDepth);
+	const uint64_t catchUpFrames = measuredLagFrames < mPolicy.lateOrDropCatchUpFrames
+		? measuredLagFrames
+		: mPolicy.lateOrDropCatchUpFrames;
+	if (catchUpFrames > 0)
+		mScheduledFrameIndex += catchUpFrames;
+
+	VideoPlayoutRecoveryDecision decision;
+	decision.result = result;
+	decision.completedFrameIndex = mCompletedFrameIndex;
+	decision.scheduledFrameIndex = mScheduledFrameIndex;
+	decision.readyQueueDepth = readyQueueDepth;
+	decision.scheduledLeadFrames = mScheduledFrameIndex > mCompletedFrameIndex
+		? mScheduledFrameIndex - mCompletedFrameIndex
+		: 0;
+	decision.measuredLagFrames = measuredLagFrames;
+	decision.catchUpFrames = catchUpFrames;
+	decision.lateStreak = mLateStreak;
+	decision.dropStreak = mDropStreak;
+	return decision;
+}
+
+double VideoPlayoutScheduler::FrameBudgetMilliseconds() const
+{
+	return mTimeScale != 0
+		? (static_cast<double>(mFrameDuration) * 1000.0) / static_cast<double>(mTimeScale)
+		: 0.0;
+}
+
+uint64_t VideoPlayoutScheduler::MeasureLag(VideoIOCompletionResult result, uint64_t readyQueueDepth) const
+{
+	if (result != VideoIOCompletionResult::DisplayedLate && result != VideoIOCompletionResult::Dropped)
+		return 0;
+
+	uint64_t lagFrames = 1;
+	if (result == VideoIOCompletionResult::DisplayedLate && mLateStreak > lagFrames)
+		lagFrames = mLateStreak;
+	if (result == VideoIOCompletionResult::Dropped && mDropStreak * 2 > lagFrames)
+		lagFrames = mDropStreak * 2;
+
+	if (mCompletedFrameIndex >= mScheduledFrameIndex)
+	{
+		const uint64_t scheduleLagFrames = mCompletedFrameIndex - mScheduledFrameIndex + 1;
+		if (scheduleLagFrames > lagFrames)
+			lagFrames = scheduleLagFrames;
+	}
+	if (readyQueueDepth < mPolicy.targetReadyFrames && mPolicy.targetReadyFrames - readyQueueDepth > lagFrames)
+		lagFrames = mPolicy.targetReadyFrames - readyQueueDepth;
+
+	return lagFrames;
+}

src/video/VideoPlayoutScheduler.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "VideoIOTypes.h"
+#include "VideoPlayoutPolicy.h"
+
+#include <cstdint>
+
+class VideoPlayoutScheduler
+{
+public:
+	void Configure(int64_t frameDuration, int64_t timeScale);
+	void Configure(int64_t frameDuration, int64_t timeScale, const VideoPlayoutPolicy& policy);
+	void Reset();
+	VideoIOScheduleTime NextScheduleTime();
+	void AlignNextScheduleTimeToPlayback(int64_t streamTime, uint64_t leadFrames);
+	VideoPlayoutRecoveryDecision AccountForCompletionResult(VideoIOCompletionResult result, uint64_t readyQueueDepth = 0);
+	double FrameBudgetMilliseconds() const;
+	uint64_t ScheduledFrameIndex() const { return mScheduledFrameIndex; }
+	uint64_t CompletedFrameIndex() const { return mCompletedFrameIndex; }
+	int64_t FrameDuration() const { return mFrameDuration; }
+	uint64_t LateStreak() const { return mLateStreak; }
+	uint64_t DropStreak() const { return mDropStreak; }
+	int64_t TimeScale() const { return mTimeScale; }
+	const VideoPlayoutPolicy& Policy() const { return mPolicy; }
+
+private:
+	uint64_t MeasureLag(VideoIOCompletionResult result, uint64_t readyQueueDepth) const;
+
+	int64_t mFrameDuration = 0;
+	int64_t mTimeScale = 0;
+	uint64_t mScheduledFrameIndex = 0;
+	uint64_t mCompletedFrameIndex = 0;
+	uint64_t mLateStreak = 0;
+	uint64_t mDropStreak = 0;
+	VideoPlayoutPolicy mPolicy;
+};

tests/CMakeLists.txt

@@ -0,0 +1,97 @@
+add_video_shader_test(RenderCadenceCompositorClockTests
+	"${SRC_DIR}/render/RenderCadenceClock.cpp"
+	"${TEST_DIR}/RenderCadenceCompositorClockTests.cpp"
+)
+
+add_video_shader_test(RenderCadenceCompositorJsonWriterTests
+	"${SRC_DIR}/json/JsonWriter.cpp"
+	"${TEST_DIR}/RenderCadenceCompositorJsonWriterTests.cpp"
+)
+
+add_video_shader_test(RenderCadenceCompositorLoggerTests
+	"${SRC_DIR}/logging/Logger.cpp"
+	"${TEST_DIR}/RenderCadenceCompositorLoggerTests.cpp"
+)
+
+add_video_shader_test(RenderCadenceCompositorTelemetryTests
+	"${SRC_DIR}/json/JsonWriter.cpp"
+	"${TEST_DIR}/RenderCadenceCompositorTelemetryTests.cpp"
+)
+
+add_video_shader_test(RuntimeJsonTests
+	"${SRC_DIR}/runtime/RuntimeJson.cpp"
+	"${TEST_DIR}/RuntimeJsonTests.cpp"
+)
+
+add_video_shader_test(RuntimeParameterUtilsTests
+	"${SRC_DIR}/runtime/RuntimeJson.cpp"
+	"${SRC_DIR}/runtime/RuntimeParameterUtils.cpp"
+	"${TEST_DIR}/RuntimeParameterUtilsTests.cpp"
+)
+
+add_video_shader_test(ShaderPackageRegistryTests
+	"${SRC_DIR}/runtime/RuntimeJson.cpp"
+	"${SRC_DIR}/shader/ShaderPackageRegistry.cpp"
+	"${TEST_DIR}/ShaderPackageRegistryTests.cpp"
+)
+
+add_video_shader_test(ShaderSlangValidationTests
+	"${SRC_DIR}/runtime/RuntimeJson.cpp"
+	"${SRC_DIR}/shader/ShaderCompiler.cpp"
+	"${SRC_DIR}/shader/ShaderPackageRegistry.cpp"
+	"${TEST_DIR}/ShaderSlangValidationTests.cpp"
+)
+
+add_video_shader_test(Std140BufferTests
+	"${TEST_DIR}/Std140BufferTests.cpp"
+)
+
+add_video_shader_test(VideoIOFormatTests
+	"${SRC_DIR}/video/DeckLinkVideoIOFormat.cpp"
+	"${SRC_DIR}/video/VideoIOFormat.cpp"
+	"${TEST_DIR}/VideoIOFormatTests.cpp"
+)
+
+add_video_shader_test(VideoPlayoutSchedulerTests
+	"${SRC_DIR}/video/VideoPlayoutScheduler.cpp"
+	"${TEST_DIR}/VideoPlayoutSchedulerTests.cpp"
+)
+
+add_video_shader_test(OutputProductionControllerTests
+	"${SRC_DIR}/video/OutputProductionController.cpp"
+	"${TEST_DIR}/OutputProductionControllerTests.cpp"
+)
+
+add_video_shader_test(RenderOutputQueueTests
+	"${SRC_DIR}/video/RenderOutputQueue.cpp"
+	"${TEST_DIR}/RenderOutputQueueTests.cpp"
+)
+
+add_video_shader_test(RenderCadenceControllerTests
+	"${SRC_DIR}/video/RenderCadenceController.cpp"
+	"${TEST_DIR}/RenderCadenceControllerTests.cpp"
+)
+
+add_video_shader_test(SystemOutputFramePoolTests
+	"${SRC_DIR}/video/SystemOutputFramePool.cpp"
+	"${SRC_DIR}/video/VideoIOFormat.cpp"
+	"${TEST_DIR}/SystemOutputFramePoolTests.cpp"
+)
+
+add_video_shader_test(VideoBackendLifecycleTests
+	"${SRC_DIR}/video/VideoBackendLifecycle.cpp"
+	"${TEST_DIR}/VideoBackendLifecycleTests.cpp"
+)
+
+add_video_shader_test(VideoIODeviceFakeTests
+	"${SRC_DIR}/video/VideoIOFormat.cpp"
+	"${TEST_DIR}/VideoIODeviceFakeTests.cpp"
+)
+
+set_tests_properties(RenderCadenceCompositorLoggerTests PROPERTIES
+	ENVIRONMENT "VIDEO_SHADER_TEST_LOG_TO_CONSOLE=0"
+)
+
+set_tests_properties(ShaderSlangValidationTests PROPERTIES
+	ENVIRONMENT "SLANG_ROOT=${SLANG_ROOT}"
+)