libobs: Add shared interface libraries to shared project directory

The ComPtr, WinHandle, and obfuscate source files are shared with
multiple sub-projects and thus need to be moved into the shared
directory to uncouple their availability from libobs itself.

The same applies to d3d8-api, inject-library, and hook-config
(from win-capture), as well as comutils (from the virtualcam-module).

shared/obs-d3d8-api/.clang-format

@@ -0,0 +1,3 @@
+Language: Cpp
+SortIncludes: false
+DisableFormat: true

shared/obs-d3d8-api/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.22...3.25)
+
+add_library(d3d8-api INTERFACE)
+add_library(OBS::d3d8-api ALIAS d3d8-api)
+target_sources(d3d8-api INTERFACE d3d8.h d3d8caps.h d3d8types.h)
+target_include_directories(d3d8-api INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")

shared/obs-d3d8-api/d3d8caps.h

@@ -0,0 +1,364 @@
+/*==========================================================================;
+ *
+ *  Copyright (C) Microsoft Corporation.  All Rights Reserved.
+ *
+ *  File:       d3d8caps.h
+ *  Content:    Direct3D capabilities include file
+ *
+ ***************************************************************************/
+
+#ifndef _D3D8CAPS_H
+#define _D3D8CAPS_H
+
+#ifndef DIRECT3D_VERSION
+#define DIRECT3D_VERSION         0x0800
+#endif  //DIRECT3D_VERSION
+
+// include this file content only if compiling for DX8 interfaces
+#if(DIRECT3D_VERSION >= 0x0800)
+
+#if defined(_X86_) || defined(_IA64_)
+#pragma pack(4)
+#endif
+
+typedef struct _D3DCAPS8
+{
+    /* Device Info */
+    D3DDEVTYPE  DeviceType;
+    UINT    AdapterOrdinal;
+
+    /* Caps from DX7 Draw */
+    DWORD   Caps;
+    DWORD   Caps2;
+    DWORD   Caps3;
+    DWORD   PresentationIntervals;
+
+    /* Cursor Caps */
+    DWORD   CursorCaps;
+
+    /* 3D Device Caps */
+    DWORD   DevCaps;
+
+    DWORD   PrimitiveMiscCaps;
+    DWORD   RasterCaps;
+    DWORD   ZCmpCaps;
+    DWORD   SrcBlendCaps;
+    DWORD   DestBlendCaps;
+    DWORD   AlphaCmpCaps;
+    DWORD   ShadeCaps;
+    DWORD   TextureCaps;
+    DWORD   TextureFilterCaps;          // D3DPTFILTERCAPS for IDirect3DTexture8's
+    DWORD   CubeTextureFilterCaps;      // D3DPTFILTERCAPS for IDirect3DCubeTexture8's
+    DWORD   VolumeTextureFilterCaps;    // D3DPTFILTERCAPS for IDirect3DVolumeTexture8's
+    DWORD   TextureAddressCaps;         // D3DPTADDRESSCAPS for IDirect3DTexture8's
+    DWORD   VolumeTextureAddressCaps;   // D3DPTADDRESSCAPS for IDirect3DVolumeTexture8's
+
+    DWORD   LineCaps;                   // D3DLINECAPS
+
+    DWORD   MaxTextureWidth, MaxTextureHeight;
+    DWORD   MaxVolumeExtent;
+
+    DWORD   MaxTextureRepeat;
+    DWORD   MaxTextureAspectRatio;
+    DWORD   MaxAnisotropy;
+    float   MaxVertexW;
+
+    float   GuardBandLeft;
+    float   GuardBandTop;
+    float   GuardBandRight;
+    float   GuardBandBottom;
+
+    float   ExtentsAdjust;
+    DWORD   StencilCaps;
+
+    DWORD   FVFCaps;
+    DWORD   TextureOpCaps;
+    DWORD   MaxTextureBlendStages;
+    DWORD   MaxSimultaneousTextures;
+
+    DWORD   VertexProcessingCaps;
+    DWORD   MaxActiveLights;
+    DWORD   MaxUserClipPlanes;
+    DWORD   MaxVertexBlendMatrices;
+    DWORD   MaxVertexBlendMatrixIndex;
+
+    float   MaxPointSize;
+
+    DWORD   MaxPrimitiveCount;          // max number of primitives per DrawPrimitive call
+    DWORD   MaxVertexIndex;
+    DWORD   MaxStreams;
+    DWORD   MaxStreamStride;            // max stride for SetStreamSource
+
+    DWORD   VertexShaderVersion;
+    DWORD   MaxVertexShaderConst;       // number of vertex shader constant registers
+
+    DWORD   PixelShaderVersion;
+    float   MaxPixelShaderValue;        // max value of pixel shader arithmetic component
+
+} D3DCAPS8;
+
+//
+// BIT DEFINES FOR D3DCAPS8 DWORD MEMBERS
+//
+
+//
+// Caps
+//
+#define D3DCAPS_READ_SCANLINE           0x00020000L
+
+//
+// Caps2
+//
+#define D3DCAPS2_NO2DDURING3DSCENE      0x00000002L
+#define D3DCAPS2_FULLSCREENGAMMA        0x00020000L
+#define D3DCAPS2_CANRENDERWINDOWED      0x00080000L
+#define D3DCAPS2_CANCALIBRATEGAMMA      0x00100000L
+#define D3DCAPS2_RESERVED               0x02000000L
+#define D3DCAPS2_CANMANAGERESOURCE      0x10000000L
+#define D3DCAPS2_DYNAMICTEXTURES        0x20000000L
+
+//
+// Caps3
+//
+#define D3DCAPS3_RESERVED               0x8000001fL
+
+// Indicates that the device can respect the ALPHABLENDENABLE render state
+// when fullscreen while using the FLIP or DISCARD swap effect.
+// COPY and COPYVSYNC swap effects work whether or not this flag is set.
+#define D3DCAPS3_ALPHA_FULLSCREEN_FLIP_OR_DISCARD   0x00000020L
+
+//
+// PresentationIntervals
+//
+#define D3DPRESENT_INTERVAL_DEFAULT     0x00000000L
+#define D3DPRESENT_INTERVAL_ONE         0x00000001L
+#define D3DPRESENT_INTERVAL_TWO         0x00000002L
+#define D3DPRESENT_INTERVAL_THREE       0x00000004L
+#define D3DPRESENT_INTERVAL_FOUR        0x00000008L
+#define D3DPRESENT_INTERVAL_IMMEDIATE   0x80000000L
+
+//
+// CursorCaps
+//
+// Driver supports HW color cursor in at least hi-res modes(height >=400)
+#define D3DCURSORCAPS_COLOR             0x00000001L
+// Driver supports HW cursor also in low-res modes(height < 400)
+#define D3DCURSORCAPS_LOWRES            0x00000002L
+
+//
+// DevCaps
+//
+#define D3DDEVCAPS_EXECUTESYSTEMMEMORY  0x00000010L /* Device can use execute buffers from system memory */
+#define D3DDEVCAPS_EXECUTEVIDEOMEMORY   0x00000020L /* Device can use execute buffers from video memory */
+#define D3DDEVCAPS_TLVERTEXSYSTEMMEMORY 0x00000040L /* Device can use TL buffers from system memory */
+#define D3DDEVCAPS_TLVERTEXVIDEOMEMORY  0x00000080L /* Device can use TL buffers from video memory */
+#define D3DDEVCAPS_TEXTURESYSTEMMEMORY  0x00000100L /* Device can texture from system memory */
+#define D3DDEVCAPS_TEXTUREVIDEOMEMORY   0x00000200L /* Device can texture from device memory */
+#define D3DDEVCAPS_DRAWPRIMTLVERTEX     0x00000400L /* Device can draw TLVERTEX primitives */
+#define D3DDEVCAPS_CANRENDERAFTERFLIP   0x00000800L /* Device can render without waiting for flip to complete */
+#define D3DDEVCAPS_TEXTURENONLOCALVIDMEM 0x00001000L /* Device can texture from nonlocal video memory */
+#define D3DDEVCAPS_DRAWPRIMITIVES2      0x00002000L /* Device can support DrawPrimitives2 */
+#define D3DDEVCAPS_SEPARATETEXTUREMEMORIES 0x00004000L /* Device is texturing from separate memory pools */
+#define D3DDEVCAPS_DRAWPRIMITIVES2EX    0x00008000L /* Device can support Extended DrawPrimitives2 i.e. DX7 compliant driver*/
+#define D3DDEVCAPS_HWTRANSFORMANDLIGHT  0x00010000L /* Device can support transformation and lighting in hardware and DRAWPRIMITIVES2EX must be also */
+#define D3DDEVCAPS_CANBLTSYSTONONLOCAL  0x00020000L /* Device supports a Tex Blt from system memory to non-local vidmem */
+#define D3DDEVCAPS_HWRASTERIZATION      0x00080000L /* Device has HW acceleration for rasterization */
+#define D3DDEVCAPS_PUREDEVICE           0x00100000L /* Device supports D3DCREATE_PUREDEVICE */
+#define D3DDEVCAPS_QUINTICRTPATCHES     0x00200000L /* Device supports quintic Beziers and BSplines */
+#define D3DDEVCAPS_RTPATCHES            0x00400000L /* Device supports Rect and Tri patches */
+#define D3DDEVCAPS_RTPATCHHANDLEZERO    0x00800000L /* Indicates that RT Patches may be drawn efficiently using handle 0 */
+#define D3DDEVCAPS_NPATCHES             0x01000000L /* Device supports N-Patches */
+
+//
+// PrimitiveMiscCaps
+//
+#define D3DPMISCCAPS_MASKZ              0x00000002L
+#define D3DPMISCCAPS_LINEPATTERNREP     0x00000004L
+#define D3DPMISCCAPS_CULLNONE           0x00000010L
+#define D3DPMISCCAPS_CULLCW             0x00000020L
+#define D3DPMISCCAPS_CULLCCW            0x00000040L
+#define D3DPMISCCAPS_COLORWRITEENABLE   0x00000080L
+#define D3DPMISCCAPS_CLIPPLANESCALEDPOINTS 0x00000100L /* Device correctly clips scaled points to clip planes */
+#define D3DPMISCCAPS_CLIPTLVERTS        0x00000200L /* device will clip post-transformed vertex primitives */
+#define D3DPMISCCAPS_TSSARGTEMP         0x00000400L /* device supports D3DTA_TEMP for temporary register */
+#define D3DPMISCCAPS_BLENDOP            0x00000800L /* device supports D3DRS_BLENDOP */
+#define D3DPMISCCAPS_NULLREFERENCE      0x00001000L /* Reference Device that doesnt render */
+
+//
+// LineCaps
+//
+#define D3DLINECAPS_TEXTURE             0x00000001L
+#define D3DLINECAPS_ZTEST               0x00000002L
+#define D3DLINECAPS_BLEND               0x00000004L
+#define D3DLINECAPS_ALPHACMP            0x00000008L
+#define D3DLINECAPS_FOG                 0x00000010L
+
+//
+// RasterCaps
+//
+#define D3DPRASTERCAPS_DITHER           0x00000001L
+#define D3DPRASTERCAPS_PAT              0x00000008L
+#define D3DPRASTERCAPS_ZTEST            0x00000010L
+#define D3DPRASTERCAPS_FOGVERTEX        0x00000080L
+#define D3DPRASTERCAPS_FOGTABLE         0x00000100L
+#define D3DPRASTERCAPS_ANTIALIASEDGES   0x00001000L
+#define D3DPRASTERCAPS_MIPMAPLODBIAS    0x00002000L
+#define D3DPRASTERCAPS_ZBIAS            0x00004000L
+#define D3DPRASTERCAPS_ZBUFFERLESSHSR   0x00008000L
+#define D3DPRASTERCAPS_FOGRANGE         0x00010000L
+#define D3DPRASTERCAPS_ANISOTROPY       0x00020000L
+#define D3DPRASTERCAPS_WBUFFER          0x00040000L
+#define D3DPRASTERCAPS_WFOG             0x00100000L
+#define D3DPRASTERCAPS_ZFOG             0x00200000L
+#define D3DPRASTERCAPS_COLORPERSPECTIVE 0x00400000L /* Device iterates colors perspective correct */
+#define D3DPRASTERCAPS_STRETCHBLTMULTISAMPLE  0x00800000L
+
+//
+// ZCmpCaps, AlphaCmpCaps
+//
+#define D3DPCMPCAPS_NEVER               0x00000001L
+#define D3DPCMPCAPS_LESS                0x00000002L
+#define D3DPCMPCAPS_EQUAL               0x00000004L
+#define D3DPCMPCAPS_LESSEQUAL           0x00000008L
+#define D3DPCMPCAPS_GREATER             0x00000010L
+#define D3DPCMPCAPS_NOTEQUAL            0x00000020L
+#define D3DPCMPCAPS_GREATEREQUAL        0x00000040L
+#define D3DPCMPCAPS_ALWAYS              0x00000080L
+
+//
+// SourceBlendCaps, DestBlendCaps
+//
+#define D3DPBLENDCAPS_ZERO              0x00000001L
+#define D3DPBLENDCAPS_ONE               0x00000002L
+#define D3DPBLENDCAPS_SRCCOLOR          0x00000004L
+#define D3DPBLENDCAPS_INVSRCCOLOR       0x00000008L
+#define D3DPBLENDCAPS_SRCALPHA          0x00000010L
+#define D3DPBLENDCAPS_INVSRCALPHA       0x00000020L
+#define D3DPBLENDCAPS_DESTALPHA         0x00000040L
+#define D3DPBLENDCAPS_INVDESTALPHA      0x00000080L
+#define D3DPBLENDCAPS_DESTCOLOR         0x00000100L
+#define D3DPBLENDCAPS_INVDESTCOLOR      0x00000200L
+#define D3DPBLENDCAPS_SRCALPHASAT       0x00000400L
+#define D3DPBLENDCAPS_BOTHSRCALPHA      0x00000800L
+#define D3DPBLENDCAPS_BOTHINVSRCALPHA   0x00001000L
+
+//
+// ShadeCaps
+//
+#define D3DPSHADECAPS_COLORGOURAUDRGB       0x00000008L
+#define D3DPSHADECAPS_SPECULARGOURAUDRGB    0x00000200L
+#define D3DPSHADECAPS_ALPHAGOURAUDBLEND     0x00004000L
+#define D3DPSHADECAPS_FOGGOURAUD            0x00080000L
+
+//
+// TextureCaps
+//
+#define D3DPTEXTURECAPS_PERSPECTIVE         0x00000001L /* Perspective-correct texturing is supported */
+#define D3DPTEXTURECAPS_POW2                0x00000002L /* Power-of-2 texture dimensions are required - applies to non-Cube/Volume textures only. */
+#define D3DPTEXTURECAPS_ALPHA               0x00000004L /* Alpha in texture pixels is supported */
+#define D3DPTEXTURECAPS_SQUAREONLY          0x00000020L /* Only square textures are supported */
+#define D3DPTEXTURECAPS_TEXREPEATNOTSCALEDBYSIZE 0x00000040L /* Texture indices are not scaled by the texture size prior to interpolation */
+#define D3DPTEXTURECAPS_ALPHAPALETTE        0x00000080L /* Device can draw alpha from texture palettes */
+// Device can use non-POW2 textures if:
+//  1) D3DTEXTURE_ADDRESS is set to CLAMP for this texture's stage
+//  2) D3DRS_WRAP(N) is zero for this texture's coordinates
+//  3) mip mapping is not enabled (use magnification filter only)
+#define D3DPTEXTURECAPS_NONPOW2CONDITIONAL  0x00000100L
+#define D3DPTEXTURECAPS_PROJECTED           0x00000400L /* Device can do D3DTTFF_PROJECTED */
+#define D3DPTEXTURECAPS_CUBEMAP             0x00000800L /* Device can do cubemap textures */
+#define D3DPTEXTURECAPS_VOLUMEMAP           0x00002000L /* Device can do volume textures */
+#define D3DPTEXTURECAPS_MIPMAP              0x00004000L /* Device can do mipmapped textures */
+#define D3DPTEXTURECAPS_MIPVOLUMEMAP        0x00008000L /* Device can do mipmapped volume textures */
+#define D3DPTEXTURECAPS_MIPCUBEMAP          0x00010000L /* Device can do mipmapped cube maps */
+#define D3DPTEXTURECAPS_CUBEMAP_POW2        0x00020000L /* Device requires that cubemaps be power-of-2 dimension */
+#define D3DPTEXTURECAPS_VOLUMEMAP_POW2      0x00040000L /* Device requires that volume maps be power-of-2 dimension */
+
+//
+// TextureFilterCaps
+//
+#define D3DPTFILTERCAPS_MINFPOINT           0x00000100L /* Min Filter */
+#define D3DPTFILTERCAPS_MINFLINEAR          0x00000200L
+#define D3DPTFILTERCAPS_MINFANISOTROPIC     0x00000400L
+#define D3DPTFILTERCAPS_MIPFPOINT           0x00010000L /* Mip Filter */
+#define D3DPTFILTERCAPS_MIPFLINEAR          0x00020000L
+#define D3DPTFILTERCAPS_MAGFPOINT           0x01000000L /* Mag Filter */
+#define D3DPTFILTERCAPS_MAGFLINEAR          0x02000000L
+#define D3DPTFILTERCAPS_MAGFANISOTROPIC     0x04000000L
+#define D3DPTFILTERCAPS_MAGFAFLATCUBIC      0x08000000L
+#define D3DPTFILTERCAPS_MAGFGAUSSIANCUBIC   0x10000000L
+
+//
+// TextureAddressCaps
+//
+#define D3DPTADDRESSCAPS_WRAP           0x00000001L
+#define D3DPTADDRESSCAPS_MIRROR         0x00000002L
+#define D3DPTADDRESSCAPS_CLAMP          0x00000004L
+#define D3DPTADDRESSCAPS_BORDER         0x00000008L
+#define D3DPTADDRESSCAPS_INDEPENDENTUV  0x00000010L
+#define D3DPTADDRESSCAPS_MIRRORONCE     0x00000020L
+
+//
+// StencilCaps
+//
+#define D3DSTENCILCAPS_KEEP             0x00000001L
+#define D3DSTENCILCAPS_ZERO             0x00000002L
+#define D3DSTENCILCAPS_REPLACE          0x00000004L
+#define D3DSTENCILCAPS_INCRSAT          0x00000008L
+#define D3DSTENCILCAPS_DECRSAT          0x00000010L
+#define D3DSTENCILCAPS_INVERT           0x00000020L
+#define D3DSTENCILCAPS_INCR             0x00000040L
+#define D3DSTENCILCAPS_DECR             0x00000080L
+
+//
+// TextureOpCaps
+//
+#define D3DTEXOPCAPS_DISABLE                    0x00000001L
+#define D3DTEXOPCAPS_SELECTARG1                 0x00000002L
+#define D3DTEXOPCAPS_SELECTARG2                 0x00000004L
+#define D3DTEXOPCAPS_MODULATE                   0x00000008L
+#define D3DTEXOPCAPS_MODULATE2X                 0x00000010L
+#define D3DTEXOPCAPS_MODULATE4X                 0x00000020L
+#define D3DTEXOPCAPS_ADD                        0x00000040L
+#define D3DTEXOPCAPS_ADDSIGNED                  0x00000080L
+#define D3DTEXOPCAPS_ADDSIGNED2X                0x00000100L
+#define D3DTEXOPCAPS_SUBTRACT                   0x00000200L
+#define D3DTEXOPCAPS_ADDSMOOTH                  0x00000400L
+#define D3DTEXOPCAPS_BLENDDIFFUSEALPHA          0x00000800L
+#define D3DTEXOPCAPS_BLENDTEXTUREALPHA          0x00001000L
+#define D3DTEXOPCAPS_BLENDFACTORALPHA           0x00002000L
+#define D3DTEXOPCAPS_BLENDTEXTUREALPHAPM        0x00004000L
+#define D3DTEXOPCAPS_BLENDCURRENTALPHA          0x00008000L
+#define D3DTEXOPCAPS_PREMODULATE                0x00010000L
+#define D3DTEXOPCAPS_MODULATEALPHA_ADDCOLOR     0x00020000L
+#define D3DTEXOPCAPS_MODULATECOLOR_ADDALPHA     0x00040000L
+#define D3DTEXOPCAPS_MODULATEINVALPHA_ADDCOLOR  0x00080000L
+#define D3DTEXOPCAPS_MODULATEINVCOLOR_ADDALPHA  0x00100000L
+#define D3DTEXOPCAPS_BUMPENVMAP                 0x00200000L
+#define D3DTEXOPCAPS_BUMPENVMAPLUMINANCE        0x00400000L
+#define D3DTEXOPCAPS_DOTPRODUCT3                0x00800000L
+#define D3DTEXOPCAPS_MULTIPLYADD                0x01000000L
+#define D3DTEXOPCAPS_LERP                       0x02000000L
+
+//
+// FVFCaps
+//
+#define D3DFVFCAPS_TEXCOORDCOUNTMASK    0x0000ffffL /* mask for texture coordinate count field */
+#define D3DFVFCAPS_DONOTSTRIPELEMENTS   0x00080000L /* Device prefers that vertex elements not be stripped */
+#define D3DFVFCAPS_PSIZE                0x00100000L /* Device can receive point size */
+
+//
+// VertexProcessingCaps
+//
+#define D3DVTXPCAPS_TEXGEN              0x00000001L /* device can do texgen */
+#define D3DVTXPCAPS_MATERIALSOURCE7     0x00000002L /* device can do DX7-level colormaterialsource ops */
+#define D3DVTXPCAPS_DIRECTIONALLIGHTS   0x00000008L /* device can do directional lights */
+#define D3DVTXPCAPS_POSITIONALLIGHTS    0x00000010L /* device can do positional lights (includes point and spot) */
+#define D3DVTXPCAPS_LOCALVIEWER         0x00000020L /* device can do local viewer */
+#define D3DVTXPCAPS_TWEENING            0x00000040L /* device can do vertex tweening */
+#define D3DVTXPCAPS_NO_VSDT_UBYTE4      0x00000080L /* device does not support D3DVSDT_UBYTE4 */
+
+#pragma pack()
+
+#endif /* (DIRECT3D_VERSION >= 0x0800) */
+#endif /* _D3D8CAPS_H_ */
+

shared/obs-hook-config/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.22...3.25)
+
+add_library(hook-config INTERFACE)
+add_library(OBS::hook-config ALIAS hook-config)
+target_sources(hook-config INTERFACE graphics-hook-ver.h graphics-hook-info.h hook-helpers.h)
+target_include_directories(hook-config INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")

shared/obs-hook-config/graphics-hook-info.h

@@ -0,0 +1,143 @@
+#pragma once
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "hook-helpers.h"
+
+#define EVENT_CAPTURE_RESTART L"CaptureHook_Restart"
+#define EVENT_CAPTURE_STOP L"CaptureHook_Stop"
+
+#define EVENT_HOOK_READY L"CaptureHook_HookReady"
+#define EVENT_HOOK_EXIT L"CaptureHook_Exit"
+
+#define EVENT_HOOK_INIT L"CaptureHook_Initialize"
+
+#define WINDOW_HOOK_KEEPALIVE L"CaptureHook_KeepAlive"
+
+#define MUTEX_TEXTURE1 L"CaptureHook_TextureMutex1"
+#define MUTEX_TEXTURE2 L"CaptureHook_TextureMutex2"
+
+#define SHMEM_HOOK_INFO L"CaptureHook_HookInfo"
+#define SHMEM_TEXTURE L"CaptureHook_Texture"
+
+#define PIPE_NAME "CaptureHook_Pipe"
+
+#pragma pack(push, 8)
+
+struct d3d8_offsets {
+	uint32_t present;
+};
+
+struct d3d9_offsets {
+	uint32_t present;
+	uint32_t present_ex;
+	uint32_t present_swap;
+	uint32_t d3d9_clsoff;
+	uint32_t is_d3d9ex_clsoff;
+};
+
+struct d3d12_offsets {
+	uint32_t execute_command_lists;
+};
+
+struct dxgi_offsets {
+	uint32_t present;
+	uint32_t resize;
+
+	uint32_t present1;
+};
+
+struct dxgi_offsets2 {
+	uint32_t release;
+};
+
+struct ddraw_offsets {
+	uint32_t surface_create;
+	uint32_t surface_restore;
+	uint32_t surface_release;
+	uint32_t surface_unlock;
+	uint32_t surface_blt;
+	uint32_t surface_flip;
+	uint32_t surface_set_palette;
+	uint32_t palette_set_entries;
+};
+
+struct shmem_data {
+	volatile int last_tex;
+	uint32_t tex1_offset;
+	uint32_t tex2_offset;
+};
+
+struct shtex_data {
+	uint32_t tex_handle;
+};
+
+enum capture_type {
+	CAPTURE_TYPE_MEMORY,
+	CAPTURE_TYPE_TEXTURE,
+};
+
+struct graphics_offsets {
+	struct d3d8_offsets d3d8;
+	struct d3d9_offsets d3d9;
+	struct dxgi_offsets dxgi;
+	struct ddraw_offsets ddraw;
+	struct dxgi_offsets2 dxgi2;
+	struct d3d12_offsets d3d12;
+};
+
+struct hook_info {
+	/* hook version */
+	uint32_t hook_ver_major;
+	uint32_t hook_ver_minor;
+
+	/* capture info */
+	enum capture_type type;
+	uint32_t window;
+	uint32_t format;
+	uint32_t cx;
+	uint32_t cy;
+	uint32_t UNUSED_base_cx;
+	uint32_t UNUSED_base_cy;
+	uint32_t pitch;
+	uint32_t map_id;
+	uint32_t map_size;
+	bool flip;
+
+	/* additional options */
+	uint64_t frame_interval;
+	bool UNUSED_use_scale;
+	bool force_shmem;
+	bool capture_overlay;
+	bool allow_srgb_alias;
+
+	/* hook addresses */
+	struct graphics_offsets offsets;
+
+	uint32_t reserved[126];
+};
+static_assert(sizeof(struct hook_info) == 648, "ABI compatibility");
+
+#pragma pack(pop)
+
+#define GC_MAPPING_FLAGS (FILE_MAP_READ | FILE_MAP_WRITE)
+
+static inline HANDLE create_hook_info(DWORD id)
+{
+	HANDLE handle = NULL;
+
+	wchar_t new_name[64];
+	const int len = swprintf(new_name, _countof(new_name),
+				 SHMEM_HOOK_INFO L"%lu", id);
+	if (len > 0) {
+		handle = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
+					    PAGE_READWRITE, 0,
+					    sizeof(struct hook_info), new_name);
+	}
+
+	return handle;
+}

shared/obs-hook-config/graphics-hook-ver.h

@@ -0,0 +1,25 @@
+/* DO NOT MODIFY THIS FILE WITHOUT CONSULTING LAIN.  OTHERWISE, LAIN WILL DO
+ * EVERYTHING IN HER POWER TO MAKE YOUR LIFE MISERABLE FROM THEREON OUT WITH A
+ * LEVEL OF DETERMINATION UNLIKE ANYTHING ANYONE HAS EVER SEEN IN THE HISTORY
+ * OF MANKIND.
+ *
+ * YES, THAT MEANS YOU READING THIS RIGHT NOW.
+ *
+ * IF YOU HAVE A FORK AND FEEL YOU NEED TO MODIFY THIS, SUBMIT A PULL REQUEST
+ * AND WAIT UNTIL IT HAS BEEN MERGED AND FULLY RELEASED IN THE CORE PROJECT
+ * BEFORE USING IT.
+ *
+ * THIS IS YOUR ONLY WARNING. */
+
+#define HOOK_VER_MAJOR 1
+#define HOOK_VER_MINOR 8
+#define HOOK_VER_PATCH 3
+
+#ifndef STRINGIFY
+#define STRINGIFY(s) #s
+#endif
+
+#define MAKE_VERSION_NAME(major, minor, patch) \
+	STRINGIFY(major) "." STRINGIFY(minor) "." STRINGIFY(patch) ".0"
+#define HOOK_VERSION_NAME \
+	MAKE_VERSION_NAME(HOOK_VER_MAJOR, HOOK_VER_MINOR, HOOK_VER_PATCH)

shared/obs-hook-config/hook-helpers.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#if !defined(__cplusplus) && !defined(inline)
+#define inline __inline
+#endif
+
+#define GC_EVENT_FLAGS (EVENT_MODIFY_STATE | SYNCHRONIZE)
+#define GC_MUTEX_FLAGS (SYNCHRONIZE)
+
+static inline HANDLE create_event(const wchar_t *name)
+{
+	return CreateEventW(NULL, false, false, name);
+}
+
+static inline HANDLE open_event(const wchar_t *name)
+{
+	return OpenEventW(GC_EVENT_FLAGS, false, name);
+}
+
+static inline HANDLE create_mutex(const wchar_t *name)
+{
+	return CreateMutexW(NULL, false, name);
+}
+
+static inline HANDLE open_mutex(const wchar_t *name)
+{
+	return OpenMutexW(GC_MUTEX_FLAGS, false, name);
+}
+
+static inline HANDLE create_event_plus_id(const wchar_t *name, DWORD id)
+{
+	wchar_t new_name[64];
+	_snwprintf(new_name, 64, L"%s%lu", name, id);
+	return create_event(new_name);
+}
+
+static inline HANDLE create_mutex_plus_id(const wchar_t *name, DWORD id)
+{
+	wchar_t new_name[64];
+	_snwprintf(new_name, 64, L"%s%lu", name, id);
+	return create_mutex(new_name);
+}
+
+static inline bool object_signalled(HANDLE event)
+{
+	if (!event)
+		return false;
+
+	return WaitForSingleObject(event, 0) == WAIT_OBJECT_0;
+}

shared/obs-inject-library/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.22...3.25)
+
+if(NOT TARGET OBS::obfuscate)
+  add_subdirectory("${CMAKE_SOURCE_DIR}/libobs" "${CMAKE_BINARY_DIR}/libobs")
+endif()
+
+add_library(inject-library INTERFACE)
+add_library(OBS::inject-library ALIAS inject-library)
+target_sources(inject-library INTERFACE inject-library.c inject-library.h)
+target_link_libraries(inject-library INTERFACE OBS::obfuscate)
+target_include_directories(inject-library INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")

shared/obs-inject-library/inject-library.c

@@ -0,0 +1,149 @@
+#include <windows.h>
+#include <stdbool.h>
+#include <util/windows/obfuscate.h>
+#include "inject-library.h"
+
+typedef HANDLE(WINAPI *create_remote_thread_t)(HANDLE, LPSECURITY_ATTRIBUTES,
+					       SIZE_T, LPTHREAD_START_ROUTINE,
+					       LPVOID, DWORD, LPDWORD);
+typedef BOOL(WINAPI *write_process_memory_t)(HANDLE, LPVOID, LPCVOID, SIZE_T,
+					     SIZE_T *);
+typedef LPVOID(WINAPI *virtual_alloc_ex_t)(HANDLE, LPVOID, SIZE_T, DWORD,
+					   DWORD);
+typedef BOOL(WINAPI *virtual_free_ex_t)(HANDLE, LPVOID, SIZE_T, DWORD);
+
+int inject_library_obf(HANDLE process, const wchar_t *dll,
+		       const char *create_remote_thread_obf, uint64_t obf1,
+		       const char *write_process_memory_obf, uint64_t obf2,
+		       const char *virtual_alloc_ex_obf, uint64_t obf3,
+		       const char *virtual_free_ex_obf, uint64_t obf4,
+		       const char *load_library_w_obf, uint64_t obf5)
+{
+	int ret = INJECT_ERROR_UNLIKELY_FAIL;
+	DWORD last_error = 0;
+	bool success = false;
+	size_t written_size;
+	DWORD thread_id;
+	HANDLE thread = NULL;
+	size_t size;
+	void *mem;
+
+	/* -------------------------------- */
+
+	HMODULE kernel32 = GetModuleHandleW(L"KERNEL32");
+	create_remote_thread_t create_remote_thread;
+	write_process_memory_t write_process_memory;
+	virtual_alloc_ex_t virtual_alloc_ex;
+	virtual_free_ex_t virtual_free_ex;
+	FARPROC load_library_w;
+
+	create_remote_thread = (create_remote_thread_t)ms_get_obfuscated_func(
+		kernel32, create_remote_thread_obf, obf1);
+	write_process_memory = (write_process_memory_t)ms_get_obfuscated_func(
+		kernel32, write_process_memory_obf, obf2);
+	virtual_alloc_ex = (virtual_alloc_ex_t)ms_get_obfuscated_func(
+		kernel32, virtual_alloc_ex_obf, obf3);
+	virtual_free_ex = (virtual_free_ex_t)ms_get_obfuscated_func(
+		kernel32, virtual_free_ex_obf, obf4);
+	load_library_w = (FARPROC)ms_get_obfuscated_func(
+		kernel32, load_library_w_obf, obf5);
+
+	/* -------------------------------- */
+
+	size = (wcslen(dll) + 1) * sizeof(wchar_t);
+	mem = virtual_alloc_ex(process, NULL, size, MEM_RESERVE | MEM_COMMIT,
+			       PAGE_READWRITE);
+	if (!mem) {
+		goto fail;
+	}
+
+	success = write_process_memory(process, mem, dll, size, &written_size);
+	if (!success) {
+		goto fail;
+	}
+
+	thread = create_remote_thread(process, NULL, 0,
+				      (LPTHREAD_START_ROUTINE)load_library_w,
+				      mem, 0, &thread_id);
+	if (!thread) {
+		goto fail;
+	}
+
+	if (WaitForSingleObject(thread, 4000) == WAIT_OBJECT_0) {
+		DWORD code;
+		GetExitCodeThread(thread, &code);
+		ret = (code != 0) ? 0 : INJECT_ERROR_INJECT_FAILED;
+
+		SetLastError(0);
+	}
+
+fail:
+	if (ret == INJECT_ERROR_UNLIKELY_FAIL) {
+		last_error = GetLastError();
+	}
+	if (thread) {
+		CloseHandle(thread);
+	}
+	if (mem) {
+		virtual_free_ex(process, mem, 0, MEM_RELEASE);
+	}
+	if (last_error != 0) {
+		SetLastError(last_error);
+	}
+
+	return ret;
+}
+
+/* ------------------------------------------------------------------------- */
+
+typedef HHOOK(WINAPI *set_windows_hook_ex_t)(int, HOOKPROC, HINSTANCE, DWORD);
+
+#define RETRY_INTERVAL_MS 500
+#define TOTAL_RETRY_TIME_MS 4000
+#define RETRY_COUNT (TOTAL_RETRY_TIME_MS / RETRY_INTERVAL_MS)
+
+int inject_library_safe_obf(DWORD thread_id, const wchar_t *dll,
+			    const char *set_windows_hook_ex_obf, uint64_t obf1)
+{
+	HMODULE user32 = GetModuleHandleW(L"USER32");
+	set_windows_hook_ex_t set_windows_hook_ex;
+	HMODULE lib = LoadLibraryW(dll);
+	HOOKPROC proc;
+	HHOOK hook;
+	size_t i;
+
+	if (!lib || !user32) {
+		return INJECT_ERROR_UNLIKELY_FAIL;
+	}
+
+#ifdef _WIN64
+	proc = (HOOKPROC)GetProcAddress(lib, "dummy_debug_proc");
+#else
+	proc = (HOOKPROC)GetProcAddress(lib, "_dummy_debug_proc@12");
+#endif
+
+	if (!proc) {
+		return INJECT_ERROR_UNLIKELY_FAIL;
+	}
+
+	set_windows_hook_ex = (set_windows_hook_ex_t)ms_get_obfuscated_func(
+		user32, set_windows_hook_ex_obf, obf1);
+
+	hook = set_windows_hook_ex(WH_GETMESSAGE, proc, lib, thread_id);
+	if (!hook) {
+		return GetLastError();
+	}
+
+	/* SetWindowsHookEx does not inject the library in to the target
+	 * process unless the event associated with it has occurred, so
+	 * repeatedly send the hook message to start the hook at small
+	 * intervals to signal to SetWindowsHookEx to process the message and
+	 * therefore inject the library in to the target process.  Repeating
+	 * this is mostly just a precaution. */
+
+	for (i = 0; i < RETRY_COUNT; i++) {
+		Sleep(RETRY_INTERVAL_MS);
+		PostThreadMessage(thread_id, WM_USER + 432, 0, (LPARAM)hook);
+	}
+	return 0;
+}

shared/obs-inject-library/inject-library.h

@@ -0,0 +1,20 @@
+#include <windows.h>
+#include <stdint.h>
+
+#define INJECT_ERROR_INJECT_FAILED -1
+#define INJECT_ERROR_INVALID_PARAMS -2
+#define INJECT_ERROR_OPEN_PROCESS_FAIL -3
+#define INJECT_ERROR_UNLIKELY_FAIL -4
+
+extern int inject_library_obf(HANDLE process, const wchar_t *dll,
+			      const char *create_remote_thread_obf,
+			      uint64_t obf1,
+			      const char *write_process_memory_obf,
+			      uint64_t obf2, const char *virtual_alloc_ex_obf,
+			      uint64_t obf3, const char *virtual_free_ex_obf,
+			      uint64_t obf4, const char *load_library_w_obf,
+			      uint64_t obf5);
+
+extern int inject_library_safe_obf(DWORD thread_id, const wchar_t *dll,
+				   const char *set_windows_hook_ex_obf,
+				   uint64_t obf1);

shared/obs-shared-memory-queue/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.22...3.25)
+
+if(NOT TARGET OBS::tiny-nv12-scale)
+  add_subdirectory("${CMAKE_SOURCE_DIR}/shared/obs-tiny-nv12-scale" obs-tiny-nv12-scale)
+endif()
+
+add_library(obs-shared-memory-queue INTERFACE)
+add_library(OBS::shared-memory-queue ALIAS obs-shared-memory-queue)
+target_sources(obs-shared-memory-queue INTERFACE shared-memory-queue.c shared-memory-queue.h)
+target_include_directories(obs-shared-memory-queue INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(obs-shared-memory-queue INTERFACE OBS::tiny-nv12-scale)

shared/obs-shared-memory-queue/shared-memory-queue.c

@@ -0,0 +1,225 @@
+#include <windows.h>
+#include "shared-memory-queue.h"
+#include "tiny-nv12-scale.h"
+
+#define VIDEO_NAME L"OBSVirtualCamVideo"
+
+enum queue_type {
+	SHARED_QUEUE_TYPE_VIDEO,
+};
+
+struct queue_header {
+	volatile uint32_t write_idx;
+	volatile uint32_t read_idx;
+	volatile uint32_t state;
+
+	uint32_t offsets[3];
+
+	uint32_t type;
+
+	uint32_t cx;
+	uint32_t cy;
+	uint64_t interval;
+
+	uint32_t reserved[8];
+};
+
+struct video_queue {
+	HANDLE handle;
+	bool ready_to_read;
+	struct queue_header *header;
+	uint64_t *ts[3];
+	uint8_t *frame[3];
+	long last_inc;
+	int dup_counter;
+	bool is_writer;
+};
+
+#define ALIGN_SIZE(size, align) size = (((size) + (align - 1)) & (~(align - 1)))
+#define FRAME_HEADER_SIZE 32
+
+video_queue_t *video_queue_create(uint32_t cx, uint32_t cy, uint64_t interval)
+{
+	struct video_queue vq = {0};
+	struct video_queue *pvq;
+	DWORD frame_size = cx * cy * 3 / 2;
+	uint32_t offset_frame[3];
+	DWORD size;
+
+	size = sizeof(struct queue_header);
+
+	ALIGN_SIZE(size, 32);
+
+	offset_frame[0] = size;
+	size += frame_size + FRAME_HEADER_SIZE;
+	ALIGN_SIZE(size, 32);
+
+	offset_frame[1] = size;
+	size += frame_size + FRAME_HEADER_SIZE;
+	ALIGN_SIZE(size, 32);
+
+	offset_frame[2] = size;
+	size += frame_size + FRAME_HEADER_SIZE;
+	ALIGN_SIZE(size, 32);
+
+	struct queue_header header = {0};
+
+	header.state = SHARED_QUEUE_STATE_STARTING;
+	header.cx = cx;
+	header.cy = cy;
+	header.interval = interval;
+	vq.is_writer = true;
+
+	for (size_t i = 0; i < 3; i++) {
+		uint32_t off = offset_frame[i];
+		header.offsets[i] = off;
+	}
+
+	/* fail if already in use */
+	vq.handle = OpenFileMappingW(FILE_MAP_READ, false, VIDEO_NAME);
+	if (vq.handle) {
+		CloseHandle(vq.handle);
+		return NULL;
+	}
+
+	vq.handle = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
+				       PAGE_READWRITE, 0, size, VIDEO_NAME);
+	if (!vq.handle) {
+		return NULL;
+	}
+
+	vq.header = (struct queue_header *)MapViewOfFile(
+		vq.handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
+	if (!vq.header) {
+		CloseHandle(vq.handle);
+		return NULL;
+	}
+	memcpy(vq.header, &header, sizeof(header));
+
+	for (size_t i = 0; i < 3; i++) {
+		uint32_t off = offset_frame[i];
+		vq.ts[i] = (uint64_t *)(((uint8_t *)vq.header) + off);
+		vq.frame[i] = ((uint8_t *)vq.header) + off + FRAME_HEADER_SIZE;
+	}
+	pvq = malloc(sizeof(vq));
+	if (!pvq) {
+		CloseHandle(vq.handle);
+		return NULL;
+	}
+	memcpy(pvq, &vq, sizeof(vq));
+	return pvq;
+}
+
+video_queue_t *video_queue_open()
+{
+	struct video_queue vq = {0};
+
+	vq.handle = OpenFileMappingW(FILE_MAP_READ, false, VIDEO_NAME);
+	if (!vq.handle) {
+		return NULL;
+	}
+
+	vq.header = (struct queue_header *)MapViewOfFile(
+		vq.handle, FILE_MAP_READ, 0, 0, 0);
+	if (!vq.header) {
+		CloseHandle(vq.handle);
+		return NULL;
+	}
+
+	struct video_queue *pvq = malloc(sizeof(vq));
+	if (!pvq) {
+		CloseHandle(vq.handle);
+		return NULL;
+	}
+	memcpy(pvq, &vq, sizeof(vq));
+	return pvq;
+}
+
+void video_queue_close(video_queue_t *vq)
+{
+	if (!vq) {
+		return;
+	}
+	if (vq->is_writer) {
+		vq->header->state = SHARED_QUEUE_STATE_STOPPING;
+	}
+
+	UnmapViewOfFile(vq->header);
+	CloseHandle(vq->handle);
+	free(vq);
+}
+
+void video_queue_get_info(video_queue_t *vq, uint32_t *cx, uint32_t *cy,
+			  uint64_t *interval)
+{
+	struct queue_header *qh = vq->header;
+	*cx = qh->cx;
+	*cy = qh->cy;
+	*interval = qh->interval;
+}
+
+#define get_idx(inc) ((unsigned long)inc % 3)
+
+void video_queue_write(video_queue_t *vq, uint8_t **data, uint32_t *linesize,
+		       uint64_t timestamp)
+{
+	struct queue_header *qh = vq->header;
+	long inc = ++qh->write_idx;
+
+	unsigned long idx = get_idx(inc);
+	size_t size = linesize[0] * qh->cy;
+
+	*vq->ts[idx] = timestamp;
+	memcpy(vq->frame[idx], data[0], size);
+	memcpy(vq->frame[idx] + size, data[1], size / 2);
+
+	qh->read_idx = inc;
+	qh->state = SHARED_QUEUE_STATE_READY;
+}
+
+enum queue_state video_queue_state(video_queue_t *vq)
+{
+	if (!vq) {
+		return SHARED_QUEUE_STATE_INVALID;
+	}
+
+	enum queue_state state = (enum queue_state)vq->header->state;
+	if (!vq->ready_to_read && state == SHARED_QUEUE_STATE_READY) {
+		for (size_t i = 0; i < 3; i++) {
+			size_t off = vq->header->offsets[i];
+			vq->ts[i] = (uint64_t *)(((uint8_t *)vq->header) + off);
+			vq->frame[i] = ((uint8_t *)vq->header) + off +
+				       FRAME_HEADER_SIZE;
+		}
+		vq->ready_to_read = true;
+	}
+
+	return state;
+}
+
+bool video_queue_read(video_queue_t *vq, nv12_scale_t *scale, void *dst,
+		      uint64_t *ts)
+{
+	struct queue_header *qh = vq->header;
+	long inc = qh->read_idx;
+
+	if (qh->state == SHARED_QUEUE_STATE_STOPPING) {
+		return false;
+	}
+
+	if (inc == vq->last_inc) {
+		if (++vq->dup_counter == 10) {
+			return false;
+		}
+	} else {
+		vq->dup_counter = 0;
+		vq->last_inc = inc;
+	}
+
+	unsigned long idx = get_idx(inc);
+
+	*ts = *vq->ts[idx];
+
+	nv12_do_scale(scale, dst, vq->frame[idx]);
+	return true;
+}

shared/obs-shared-memory-queue/shared-memory-queue.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct video_queue;
+struct nv12_scale;
+typedef struct video_queue video_queue_t;
+typedef struct nv12_scale nv12_scale_t;
+
+enum queue_state {
+	SHARED_QUEUE_STATE_INVALID,
+	SHARED_QUEUE_STATE_STARTING,
+	SHARED_QUEUE_STATE_READY,
+	SHARED_QUEUE_STATE_STOPPING,
+};
+
+extern video_queue_t *video_queue_create(uint32_t cx, uint32_t cy,
+					 uint64_t interval);
+extern video_queue_t *video_queue_open();
+extern void video_queue_close(video_queue_t *vq);
+
+extern void video_queue_get_info(video_queue_t *vq, uint32_t *cx, uint32_t *cy,
+				 uint64_t *interval);
+extern void video_queue_write(video_queue_t *vq, uint8_t **data,
+			      uint32_t *linesize, uint64_t timestamp);
+extern enum queue_state video_queue_state(video_queue_t *vq);
+extern bool video_queue_read(video_queue_t *vq, nv12_scale_t *scale, void *dst,
+			     uint64_t *ts);
+
+#ifdef __cplusplus
+}
+#endif

shared/obs-tiny-nv12-scale/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.22...3.25)
+
+add_library(obs-tiny-nv12-scale INTERFACE)
+add_library(OBS::tiny-nv12-scale ALIAS obs-tiny-nv12-scale)
+target_sources(obs-tiny-nv12-scale INTERFACE tiny-nv12-scale.c tiny-nv12-scale.h)
+target_include_directories(obs-tiny-nv12-scale INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")

shared/obs-tiny-nv12-scale/tiny-nv12-scale.c

@@ -0,0 +1,207 @@
+#include <string.h>
+#include "tiny-nv12-scale.h"
+
+/* TODO: optimize this stuff later, or replace with something better.  it's
+ * kind of garbage.  although normally it shouldn't be called that often.  plus
+ * it's nearest neighbor so not really a huge deal.  at the very least it
+ * should be sse2 at some point. */
+
+void nv12_scale_init(nv12_scale_t *s, enum target_format format, int dst_cx,
+		     int dst_cy, int src_cx, int src_cy)
+{
+	s->format = format;
+
+	s->src_cx = src_cx;
+	s->src_cy = src_cy;
+
+	s->dst_cx = dst_cx;
+	s->dst_cy = dst_cy;
+}
+
+static void nv12_scale_nearest(nv12_scale_t *s, uint8_t *dst_start,
+			       const uint8_t *src)
+{
+	register uint8_t *dst = dst_start;
+	const int src_cx = s->src_cx;
+	const int src_cy = s->src_cy;
+	const int dst_cx = s->dst_cx;
+	const int dst_cy = s->dst_cy;
+
+	/* lum */
+	for (int y = 0; y < dst_cy; y++) {
+		const int src_line = y * src_cy / dst_cy * s->src_cx;
+
+		for (int x = 0; x < dst_cx; x++) {
+			const int src_x = x * src_cx / dst_cx;
+
+			*(dst++) = src[src_line + src_x];
+		}
+	}
+
+	src += src_cx * src_cy;
+
+	/* uv */
+	const int dst_cx_d2 = dst_cx / 2;
+	const int dst_cy_d2 = dst_cy / 2;
+
+	for (int y = 0; y < dst_cy_d2; y++) {
+		const int src_line = y * src_cy / dst_cy * src_cx;
+
+		for (int x = 0; x < dst_cx_d2; x++) {
+			const int src_x = x * src_cx / dst_cx * 2;
+			const int pos = src_line + src_x;
+
+			*(dst++) = src[pos];
+			*(dst++) = src[pos + 1];
+		}
+	}
+}
+
+static void nv12_scale_nearest_to_i420(nv12_scale_t *s, uint8_t *dst_start,
+				       const uint8_t *src)
+{
+	register uint8_t *dst = dst_start;
+	const int src_cx = s->src_cx;
+	const int src_cy = s->src_cy;
+	const int dst_cx = s->dst_cx;
+	const int dst_cy = s->dst_cy;
+	const int size = src_cx * src_cy;
+
+	/* lum */
+	for (int y = 0; y < dst_cy; y++) {
+		const int src_line = y * src_cy / dst_cy * s->src_cx;
+
+		for (int x = 0; x < dst_cx; x++) {
+			const int src_x = x * src_cx / dst_cx;
+
+			*(dst++) = src[src_line + src_x];
+		}
+	}
+
+	src += size;
+
+	/* uv */
+	const int dst_cx_d2 = dst_cx / 2;
+	const int dst_cy_d2 = dst_cy / 2;
+
+	register uint8_t *dst2 = dst + dst_cx * dst_cy / 4;
+
+	for (int y = 0; y < dst_cy_d2; y++) {
+		const int src_line = y * src_cy / dst_cy * src_cx;
+
+		for (int x = 0; x < dst_cx_d2; x++) {
+			const int src_x = x * src_cx / dst_cx * 2;
+			const int pos = src_line + src_x;
+
+			*(dst++) = src[pos];
+			*(dst2++) = src[pos + 1];
+		}
+	}
+}
+
+static void nv12_convert_to_i420(nv12_scale_t *s, uint8_t *dst_start,
+				 const uint8_t *src_start)
+{
+	const int size = s->src_cx * s->src_cy;
+	const int size_d4 = size / 4;
+
+	memcpy(dst_start, src_start, size);
+
+	register uint8_t *dst1 = dst_start + size;
+	register uint8_t *dst2 = dst1 + size_d4;
+	register uint8_t *dst_end = dst2 + size_d4;
+	register const uint8_t *src = src_start + size;
+
+	while (dst2 < dst_end) {
+		*(dst1++) = *(src++);
+		*(dst2++) = *(src++);
+	}
+}
+
+static void nv12_scale_nearest_to_yuy2(nv12_scale_t *s, uint8_t *dst_start,
+				       const uint8_t *src)
+{
+	register uint8_t *dst = dst_start;
+	const int src_cx = s->src_cx;
+	const int src_cy = s->src_cy;
+	const int dst_cx = s->dst_cx;
+	const int dst_cy = s->dst_cy;
+	const int src_cx_d2 = src_cx / 2;
+	const int src_cy_d2 = src_cy / 2;
+	const int dst_cx_d2 = dst_cx / 2;
+	const int dst_cy_d2 = dst_cy / 2;
+	const int size = src_cx * src_cy;
+
+	const uint8_t *src_uv = src + size;
+
+	register int uv_flip = 0;
+
+	for (int y = 0; y < dst_cy; y++) {
+		const int src_line = y * src_cy / dst_cy * s->src_cx;
+		const int src_line_d2 =
+			y / 2 * src_cy_d2 / dst_cy_d2 * s->src_cx;
+
+		for (int x = 0; x < dst_cx; x++) {
+			const int src_x = x * src_cx / dst_cx;
+			const int src_x_d2 = x / 2 * src_cx_d2 / dst_cx_d2;
+			const int pos = src_line + src_x;
+			const int pos_uv = src_line_d2 + src_x_d2 * 2 + uv_flip;
+
+			*(dst++) = src[pos];
+			*(dst++) = src_uv[pos_uv];
+
+			uv_flip ^= 1;
+		}
+	}
+}
+
+static void nv12_convert_to_yuy2(nv12_scale_t *s, uint8_t *dst_start,
+				 const uint8_t *src_start)
+{
+	const int size = s->src_cx * s->src_cy;
+	const int size_dst_line = s->src_cx * 2;
+
+	register const uint8_t *src_y = src_start;
+	register const uint8_t *src_uv = src_y + size;
+	register uint8_t *dst = dst_start;
+	register uint8_t *dst_end = dst + size * 2;
+
+	while (dst < dst_end) {
+		register uint8_t *dst_line_end = dst + size_dst_line;
+		const uint8_t *src_uv_start = src_uv;
+		while (dst < dst_line_end) {
+			*(dst++) = *(src_y++);
+			*(dst++) = *(src_uv++);
+			*(dst++) = *(src_y++);
+			*(dst++) = *(src_uv++);
+		}
+
+		dst_line_end = dst + size_dst_line;
+		src_uv = src_uv_start;
+		while (dst < dst_line_end) {
+			*(dst++) = *(src_y++);
+			*(dst++) = *(src_uv++);
+			*(dst++) = *(src_y++);
+			*(dst++) = *(src_uv++);
+		}
+	}
+}
+
+void nv12_do_scale(nv12_scale_t *s, uint8_t *dst, const uint8_t *src)
+{
+	if (s->src_cx == s->dst_cx && s->src_cy == s->dst_cy) {
+		if (s->format == TARGET_FORMAT_I420)
+			nv12_convert_to_i420(s, dst, src);
+		else if (s->format == TARGET_FORMAT_YUY2)
+			nv12_convert_to_yuy2(s, dst, src);
+		else
+			memcpy(dst, src, s->src_cx * s->src_cy * 3 / 2);
+	} else {
+		if (s->format == TARGET_FORMAT_I420)
+			nv12_scale_nearest_to_i420(s, dst, src);
+		else if (s->format == TARGET_FORMAT_YUY2)
+			nv12_scale_nearest_to_yuy2(s, dst, src);
+		else
+			nv12_scale_nearest(s, dst, src);
+	}
+}

shared/obs-tiny-nv12-scale/tiny-nv12-scale.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum target_format {
+	TARGET_FORMAT_NV12,
+	TARGET_FORMAT_I420,
+	TARGET_FORMAT_YUY2,
+};
+
+struct nv12_scale {
+	enum target_format format;
+
+	int src_cx;
+	int src_cy;
+
+	int dst_cx;
+	int dst_cy;
+};
+
+typedef struct nv12_scale nv12_scale_t;
+
+extern void nv12_scale_init(nv12_scale_t *s, enum target_format format,
+			    int dst_cx, int dst_cy, int src_cx, int src_cy);
+extern void nv12_do_scale(nv12_scale_t *s, uint8_t *dst, const uint8_t *src);
+
+#ifdef __cplusplus
+}
+#endif