Add option to select render device for VAAPI

assets/sunshine.conf

@@ -118,7 +118,11 @@
 # output_name  = \\.\DISPLAY1
 
 # !! Linux only !!
-# Set the display number to stream. I have no idea how they are numbered. They start from 0, usually.
+# Set the display number to stream.
+# You can find them by the following command:
+# xrandr --listmonitors
+# Example output: "0: +HDMI-1 1920/518x1200/324+0+0  HDMI-1"
+#                  ^ <-- You need this.
 # output_name = 0
 
 ###############################################
@@ -222,6 +226,19 @@
 ##########################
 # amd_coder = auto
 
+#################################### VAAPI ###################################
+####### adapter ##########
+# Unlike with `amfvce` and `nvenc`, it doesn't matter if video encoding is done
+# on a different GPU.
+# Run the following commands:
+# 1. ls /dev/dri/renderD*
+#   to find all devices capable of VAAPI
+# 2. vainfo --display drm --device /dev/dri/renderD129 | grep -E "((VAProfileH264High|VAProfileHEVCMain|VAProfileHEVCMain10).*VAEntrypointEncSlice)|Driver version"
+#   Lists the name and capabilities of the device.
+#   To be supported by Sunshine, it needs to have at the very minimum:
+#       VAProfileH264High   : VAEntrypointEncSlice
+# adapter_name = /dev/dri/renderD128
+
 ##############################################
 # Some configurable parameters, are merely toggles for specific features
 # The first occurrence turns it on, the second occurence turns it off, the third occurence turns it on again, etc, etc
@@ -230,4 +247,5 @@
 # To set the initial state of flags -0 and -1 to on, set the following flags:
 # flags = 01
 #
-# See: sunshine --help for all options under the header: flags
+# See: sunshine --help for all options under the header: flags
+adapter_name = /dev/dri/renderD129

sunshine/platform/linux/vaapi.cpp

@@ -15,6 +15,7 @@ extern "C" {
 #include <libavutil/hwcontext_vaapi.h>
 }
 
+#include "sunshine/config.h"
 #include "sunshine/main.h"
 #include "sunshine/platform/common.h"
 #include "sunshine/utility.h"
@@ -347,7 +348,6 @@ private:
 
 namespace platf {
 namespace egl {
-auto constexpr render_device = "/dev/dri/renderD129";
 
 constexpr auto EGL_LINUX_DMA_BUF_EXT         = 0x3270;
 constexpr auto EGL_LINUX_DRM_FOURCC_EXT      = 0x3271;
@@ -794,7 +794,9 @@ int vaapi_make_hwdevice_ctx(platf::hwdevice_t *base, AVBufferRef **hw_device_buf
 
   va::display_t display { vaGetDisplayDRM(egl->file.el) };
   if(!display) {
-    BOOST_LOG(error) << "Couldn't open a va display from DRM with device: "sv << platf::egl::render_device;
+    auto render_device = config::video.adapter_name.empty() ? "/dev/dri/renderD128" : config::video.adapter_name.c_str();
+
+    BOOST_LOG(error) << "Couldn't open a va display from DRM with device: "sv << render_device;
     return -1;
   }
 
@@ -832,6 +834,7 @@ int vaapi_make_hwdevice_ctx(platf::hwdevice_t *base, AVBufferRef **hw_device_buf
 std::shared_ptr<platf::hwdevice_t> make_hwdevice() {
   auto egl = std::make_shared<egl_t>();
 
+  auto render_device = config::video.adapter_name.empty() ? "/dev/dri/renderD128" : config::video.adapter_name.c_str();
   if(egl->init(render_device)) {
     return nullptr;
   }

sunshine/video.cpp

@@ -1486,7 +1486,9 @@ util::Either<buffer_t, int> vaapi_make_hwdevice_ctx(platf::hwdevice_t *base) {
     return hw_device_buf;
   }
 
-  auto status = av_hwdevice_ctx_create(&hw_device_buf, AV_HWDEVICE_TYPE_VAAPI, "/dev/dri/renderD129", nullptr, 0);
+  auto render_device = config::video.adapter_name.empty() ? nullptr : config::video.adapter_name.c_str();
+
+  auto status = av_hwdevice_ctx_create(&hw_device_buf, AV_HWDEVICE_TYPE_VAAPI, render_device, nullptr, 0);
   if(status < 0) {
     char string[AV_ERROR_MAX_STRING_SIZE];
     BOOST_LOG(error) << "Failed to create a VAAPI device: "sv << av_make_error_string(string, AV_ERROR_MAX_STRING_SIZE, status);