feat(win/nvenc): add split frame encoding option

.gitmodules

@@ -26,10 +26,18 @@
 	path = third-party/nanors
 	url = https://github.com/sleepybishop/nanors.git
 	branch = master
-[submodule "third-party/nv-codec-headers"]
-	path = third-party/nv-codec-headers
-	url = https://github.com/FFmpeg/nv-codec-headers
+[submodule "third-party/nvenc-headers/1100"]
+	path = third-party/nvenc-headers/1100
+	url = https://github.com/FFmpeg/nv-codec-headers.git
+	branch = sdk/11.0
+[submodule "third-party/nvenc-headers/1200"]
+	path = third-party/nvenc-headers/1200
+	url = https://github.com/FFmpeg/nv-codec-headers.git
 	branch = sdk/12.0
+[submodule "third-party/nvenc-headers/1202"]
+	path = third-party/nvenc-headers/1202
+	url = https://github.com/FFmpeg/nv-codec-headers.git
+	branch = master
 [submodule "third-party/nvapi-open-source-sdk"]
 	path = third-party/nvapi-open-source-sdk
 	url = https://github.com/LizardByte/nvapi-open-source-sdk

cmake/compile_definitions/common.cmake

@@ -48,10 +48,6 @@ elseif(UNIX)
     endif()
 endif()
 
-include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/third-party/nv-codec-headers/include")
-file(GLOB NVENC_SOURCES CONFIGURE_DEPENDS "src/nvenc/*.cpp" "src/nvenc/*.h")
-list(APPEND PLATFORM_TARGET_FILES ${NVENC_SOURCES})
-
 configure_file("${CMAKE_SOURCE_DIR}/src/version.h.in" version.h @ONLY)
 include_directories("${CMAKE_CURRENT_BINARY_DIR}")  # required for importing version.h
 

cmake/compile_definitions/windows.cmake

@@ -30,6 +30,11 @@ file(GLOB NVPREFS_FILES CONFIGURE_DEPENDS
         "${CMAKE_SOURCE_DIR}/src/platform/windows/nvprefs/*.cpp"
         "${CMAKE_SOURCE_DIR}/src/platform/windows/nvprefs/*.h")
 
+include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/third-party/nvenc-headers")
+file(GLOB_RECURSE NVENC_SOURCES CONFIGURE_DEPENDS
+        "${CMAKE_SOURCE_DIR}/src/nvenc/*.h"
+        "${CMAKE_SOURCE_DIR}/src/nvenc/*.cpp")
+
 # vigem
 include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/third-party/ViGEmClient/include")
 
@@ -57,7 +62,8 @@ set(PLATFORM_TARGET_FILES
         "${CMAKE_SOURCE_DIR}/third-party/ViGEmClient/include/ViGEm/Common.h"
         "${CMAKE_SOURCE_DIR}/third-party/ViGEmClient/include/ViGEm/Util.h"
         "${CMAKE_SOURCE_DIR}/third-party/ViGEmClient/include/ViGEm/km/BusShared.h"
-        ${NVPREFS_FILES})
+        ${NVPREFS_FILES}
+        ${NVENC_SOURCES})
 
 set(OPENSSL_LIBRARIES
         libssl.a

docs/configuration.md

@@ -1774,6 +1774,46 @@ editing the `conf` file in a text editor. Use the examples as reference.
     </tr>
 </table>
 
+### [nvenc_split_encode](https://localhost:47990/config/#nvenc_split_encode)
+
+<table>
+    <tr>
+        <td>Description</td>
+        <td colspan="2">
+            Split the encoding of each video frame over multiple NVENC hardware units.
+            Significantly reduces encoding latency with a marginal compression efficiency penalty.
+            This option is ignored if your GPU has a singular NVENC unit.
+            @note{This option only applies when using NVENC [encoder](#encoderhttpslocalhost47990configencoder).}
+            @note{Applies to Windows only.}
+        </td>
+    </tr>
+    <tr>
+        <td>Default</td>
+        <td colspan="2">@code{}
+            driver_decides
+            @endcode</td>
+    </tr>
+    <tr>
+        <td>Example</td>
+        <td colspan="2">@code{}
+            nvenc_split_encode = driver_decides
+            @endcode</td>
+    </tr>
+    <tr>
+        <td rowspan="3">Choices</td>
+        <td>disabled</td>
+        <td>Disabled</td>
+    </tr>
+    <tr>
+        <td>driver_decides</td>
+        <td>NVIDIA driver makes the decision whether to enable it</td>
+    </tr>
+    <tr>
+        <td>enabled</td>
+        <td>Enabled</td>
+    </tr>
+</table>
+
 ### [nvenc_latency_over_power](https://localhost:47990/config/#nvenc_latency_over_power)
 
 <table>

src/config.cpp

@@ -56,6 +56,16 @@ namespace config {
       return nvenc::nvenc_two_pass::quarter_resolution;
     }
 
+    nvenc::nvenc_split_frame_encoding
+    split_encode_from_view(const std::string_view &preset) {
+      using enum nvenc::nvenc_split_frame_encoding;
+      if (preset == "disabled") return disabled;
+      if (preset == "driver_decides") return driver_decides;
+      if (preset == "enabled") return force_enabled;
+      BOOST_LOG(warning) << "config: unknown nvenc_split_encode value: " << preset;
+      return driver_decides;
+    }
+
   }  // namespace nv
 
   namespace amd {
@@ -960,6 +970,7 @@ namespace config {
     bool_f(vars, "nvenc_spatial_aq", video.nv.adaptive_quantization);
     generic_f(vars, "nvenc_twopass", video.nv.two_pass, nv::twopass_from_view);
     bool_f(vars, "nvenc_h264_cavlc", video.nv.h264_cavlc);
+    generic_f(vars, "nvenc_split_encode", video.nv.split_frame_encoding, nv::split_encode_from_view);
     bool_f(vars, "nvenc_realtime_hags", video.nv_realtime_hags);
     bool_f(vars, "nvenc_opengl_vulkan_on_dxgi", video.nv_opengl_vulkan_on_dxgi);
     bool_f(vars, "nvenc_latency_over_power", video.nv_sunshine_high_power_mode);