[FFmpeg-devel] [PATCH v4 1/3] lavu/hwcontext_vaapi: Add Windows/VAAPI support with vaGetDisplayWin32

[Sil Vilerino <sivileri@linux.microsoft.com>]

From: Sil Vilerino <sivileri@microsoft.com>

Libva 2.17+ adds a new libva-win32 node and Mesa 22.3 adds a VAAPI driver
based on Direct3D 12 for Windows. Both of them are available at:
https://www.nuget.org/packages/Microsoft.Direct3D.VideoAccelerationCompatibilityPack

Initial review at https://github.com/intel-media-ci/ffmpeg/pull/619/

Signed-off-by: Sil Vilerino <sivileri@microsoft.com>
Reviewed-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Reviewed-by: Wu, Tong1 <tong1.wu@intel.com>
---
 Changelog                   |  1 +
 configure                   | 27 ++++++++++++-
 libavutil/hwcontext_vaapi.c | 78 ++++++++++++++++++++++++++++++++++++-
 libavutil/tests/hwdevice.c  |  2 +-
 4 files changed, 103 insertions(+), 5 deletions(-)

diff --git a/Changelog b/Changelog
index a40f32c23f..4ae8a4fe20 100644
--- a/Changelog
+++ b/Changelog
@@ -3,6 +3,7 @@ releases are sorted from youngest to oldest.
 
 version <next>:
 - libaribcaption decoder
+- Extend VAAPI support for libva-win32 on Windows
 
 version 6.0:
 - Radiance HDR image support
diff --git a/configure b/configure
index 033db7442d..2a45b11aa4 100755
--- a/configure
+++ b/configure
@@ -2316,6 +2316,7 @@ SYSTEM_LIBRARIES="
     bcrypt
     vaapi_drm
     vaapi_x11
+    vaapi_win32
     vdpau_x11
 "
 
@@ -3826,7 +3827,7 @@ swscale_suggest="libm stdatomic"
 
 avcodec_extralibs="pthreads_extralibs iconv_extralibs dxva2_extralibs lcms2_extralibs"
 avfilter_extralibs="pthreads_extralibs"
-avutil_extralibs="d3d11va_extralibs mediacodec_extralibs nanosleep_extralibs pthreads_extralibs vaapi_drm_extralibs vaapi_x11_extralibs vdpau_x11_extralibs"
+avutil_extralibs="d3d11va_extralibs mediacodec_extralibs nanosleep_extralibs pthreads_extralibs vaapi_drm_extralibs vaapi_x11_extralibs vaapi_win32_extralibs vdpau_x11_extralibs"
 
 # programs
 ffmpeg_deps="avcodec avfilter avformat threads"
@@ -6947,6 +6948,21 @@ test_cpp <<EOF && enable uwp && d3d11va_extralibs="-ldxgi -ld3d11"
 #endif
 EOF
 
+# vaapi_win32 requires linking directly to dxgi if not building for
+# the desktop api partition
+test_cpp <<EOF && enable uwp && vaapi_win32_extralibs="-ldxgi"
+#ifdef WINAPI_FAMILY
+#include <winapifamily.h>
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+#error desktop, not uwp
+#else
+// WINAPI_FAMILY_APP, WINAPI_FAMILY_PHONE_APP => UWP
+#endif
+#else
+#error no family set
+#endif
+EOF
+
 # mediafoundation requires linking directly to mfplat if building for uwp target
 enabled uwp && mediafoundation_extralibs="-lmfplat -lmfuuid -lole32 -lstrmiids" || mediafoundation_extralibs="-lmfuuid -lole32 -lstrmiids"
 
@@ -6957,7 +6973,14 @@ enabled vaapi &&
     check_pkg_config vaapi "libva >= 0.35.0" "va/va.h" vaInitialize
 
 if enabled vaapi; then
-    check_pkg_config vaapi_drm "libva-drm" "va/va_drm.h" vaGetDisplayDRM
+    case $target_os in
+        mingw32*|mingw64*|win32|win64)
+            check_pkg_config vaapi_win32 "libva-win32" "va/va_win32.h" vaGetDisplayWin32
+            ;;
+        *)
+            check_pkg_config vaapi_drm "libva-drm" "va/va_drm.h" vaGetDisplayDRM
+            ;;
+    esac
 
     if enabled xlib_x11; then
         check_pkg_config vaapi_x11 "libva-x11" "va/va_x11.h" vaGetDisplay
diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
index 90c2c191d9..6c3a227ddd 100644
--- a/libavutil/hwcontext_vaapi.c
+++ b/libavutil/hwcontext_vaapi.c
@@ -18,6 +18,15 @@
 
 #include "config.h"
 
+#if HAVE_VAAPI_WIN32
+#   include <windows.h>
+#define COBJMACROS
+#   include <initguid.h>
+#   include <dxgi1_2.h>
+#   include "compat/w32dlfcn.h"
+#   include <va/va_win32.h>
+typedef HRESULT (WINAPI *PFN_CREATE_DXGI_FACTORY)(REFIID riid, void **ppFactory);
+#endif
 #if HAVE_VAAPI_X11
 #   include <va/va_x11.h>
 #endif
@@ -1663,7 +1672,7 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
     VAAPIDevicePriv *priv;
     VADisplay display = NULL;
     const AVDictionaryEntry *ent;
-    int try_drm, try_x11, try_all;
+    int try_drm, try_x11, try_win32, try_all;
 
     priv = av_mallocz(sizeof(*priv));
     if (!priv)
@@ -1676,11 +1685,13 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
 
     ent = av_dict_get(opts, "connection_type", NULL, 0);
     if (ent) {
-        try_all = try_drm = try_x11 = 0;
+        try_all = try_drm = try_x11 = try_win32 = 0;
         if (!strcmp(ent->value, "drm")) {
             try_drm = 1;
         } else if (!strcmp(ent->value, "x11")) {
             try_x11 = 1;
+        } else if (!strcmp(ent->value, "win32")) {
+            try_win32 = 1;
         } else {
             av_log(ctx, AV_LOG_ERROR, "Invalid connection type %s.\n",
                    ent->value);
@@ -1690,6 +1701,7 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
         try_all = 1;
         try_drm = HAVE_VAAPI_DRM;
         try_x11 = HAVE_VAAPI_X11;
+        try_win32 = HAVE_VAAPI_WIN32;
     }
 
 #if HAVE_VAAPI_DRM
@@ -1797,6 +1809,68 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
     }
 #endif
 
+#if HAVE_VAAPI_WIN32
+    if (!display && try_win32) {
+        // Try to create a display from the specified device, if any.
+        if (!device) {
+            display = vaGetDisplayWin32(NULL);
+        } else {
+            IDXGIFactory2 *pDXGIFactory = NULL;
+            IDXGIAdapter *pAdapter = NULL;
+#if !HAVE_UWP
+            HANDLE dxgi = dlopen("dxgi.dll", 0);
+            if (!dxgi) {
+                av_log(ctx, AV_LOG_ERROR, "Failed to load dxgi.dll\n");
+                return AVERROR_UNKNOWN;
+            }
+            PFN_CREATE_DXGI_FACTORY pfnCreateDXGIFactory =
+                (PFN_CREATE_DXGI_FACTORY)dlsym(dxgi, "CreateDXGIFactory");
+            if (!pfnCreateDXGIFactory) {
+                av_log(ctx, AV_LOG_ERROR, "CreateDXGIFactory load failed\n");
+                dlclose(dxgi);
+                return AVERROR_UNKNOWN;
+            }
+#else
+            // In UWP (which lacks LoadLibrary), CreateDXGIFactory isn't
+            // available, only CreateDXGIFactory1
+            PFN_CREATE_DXGI_FACTORY pfnCreateDXGIFactory =
+                (PFN_CREATE_DXGI_FACTORY)CreateDXGIFactory1;
+#endif
+            if (SUCCEEDED(pfnCreateDXGIFactory(&IID_IDXGIFactory2,
+                                              (void **)&pDXGIFactory))) {
+                int adapter = atoi(device);
+                if (SUCCEEDED(IDXGIFactory2_EnumAdapters(pDXGIFactory,
+                                                         adapter,
+                                                         &pAdapter))) {
+                    DXGI_ADAPTER_DESC desc;
+                    if (SUCCEEDED(IDXGIAdapter2_GetDesc(pAdapter, &desc))) {
+                        av_log(ctx, AV_LOG_INFO,
+                              "Using device %04x:%04x (%ls) - LUID %lu %ld.\n",
+                              desc.VendorId, desc.DeviceId, desc.Description,
+                              desc.AdapterLuid.LowPart,
+                              desc.AdapterLuid.HighPart);
+                        display = vaGetDisplayWin32(&desc.AdapterLuid);
+                    }
+                    IDXGIAdapter_Release(pAdapter);
+                }
+                IDXGIFactory2_Release(pDXGIFactory);
+            }
+#if !HAVE_UWP
+            dlclose(dxgi);
+#endif
+        }
+
+        if (!display) {
+            av_log(ctx, AV_LOG_ERROR, "Cannot open a VA display "
+                    "from Win32 display.\n");
+            return AVERROR_UNKNOWN;
+        }
+
+        av_log(ctx, AV_LOG_VERBOSE, "Opened VA display via "
+                "Win32 display.\n");
+    }
+#endif
+
     if (!display) {
         if (device)
             av_log(ctx, AV_LOG_ERROR, "No VA display found for "
diff --git a/libavutil/tests/hwdevice.c b/libavutil/tests/hwdevice.c
index 7eb355c988..c57586613a 100644
--- a/libavutil/tests/hwdevice.c
+++ b/libavutil/tests/hwdevice.c
@@ -140,7 +140,7 @@ static const struct {
     { AV_HWDEVICE_TYPE_OPENCL,
       { "0.0", "0.1", "1.0", "1.1" } },
     { AV_HWDEVICE_TYPE_VAAPI,
-      { "/dev/dri/renderD128", "/dev/dri/renderD129", ":0" } },
+      { "/dev/dri/renderD128", "/dev/dri/renderD129", ":0", "0", "1" } },
 };
 
 static int test_device_type(enum AVHWDeviceType type)
-- 
2.39.2.vfs.0.0

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