Provide ability to force a capture method via configuration. (#1063)

Co-authored-by: KuleRucket <luke.d.tucker@gmail.com>

src/config.cpp

@@ -351,6 +351,7 @@ video_t video {
     -1,
   }, // vt
 
+  {},  // capture
   {},  // encoder
   {},  // adapter_name
   {},  // output_name
@@ -882,6 +883,7 @@ void apply_config(std::unordered_map<std::string, std::string> &&vars) {
   int_f(vars, "vt_software", video.vt.vt_require_sw, vt::force_software_from_view);
   int_f(vars, "vt_realtime", video.vt.vt_realtime, vt::rt_from_view);
 
+  string_f(vars, "capture", video.capture);
   string_f(vars, "encoder", video.encoder);
   string_f(vars, "adapter_name", video.adapter_name);
   string_f(vars, "output_name", video.output_name);

src/config.h

@@ -52,6 +52,7 @@ struct video_t {
     int vt_coder;
   } vt;
 
+  std::string capture;
   std::string encoder;
   std::string adapter_name;
   std::string output_name;

src/platform/linux/misc.cpp

@@ -1,4 +1,14 @@
+/**
+ * @file misc.cpp
+ */
+
+// standard includes
+#include <fstream>
+
+// lib includes
 #include <arpa/inet.h>
+#include <boost/asio/ip/address.hpp>
+#include <boost/process.hpp>
 #include <dlfcn.h>
 #include <fcntl.h>
 #include <ifaddrs.h>
@@ -6,17 +16,13 @@
 #include <pwd.h>
 #include <unistd.h>
 
-#include <fstream>
-
+// local includes
 #include "graphics.h"
 #include "misc.h"
-#include "vaapi.h"
-
+#include "src/config.h"
 #include "src/main.h"
 #include "src/platform/common.h"
-
-#include <boost/asio/ip/address.hpp>
-#include <boost/process.hpp>
+#include "vaapi.h"
 
 #ifdef __GNUC__
 #define SUNSHINE_GNUC_EXTENSION __extension__
@@ -518,34 +524,44 @@ std::unique_ptr<deinit_t> init() {
     window_system = window_system_e::X11;
   }
 #endif
+
 #ifdef SUNSHINE_BUILD_CUDA
-  if(verify_nvfbc()) {
-    sources[source::NVFBC] = true;
+  if(config::video.capture.empty() || config::video.capture == "nvfbc") {
+    if(verify_nvfbc()) {
+      sources[source::NVFBC] = true;
+    }
   }
 #endif
 #ifdef SUNSHINE_BUILD_WAYLAND
-  if(verify_wl()) {
-    sources[source::WAYLAND] = true;
+  if(config::video.capture.empty() || config::video.capture == "wlr") {
+    if(verify_wl()) {
+      sources[source::WAYLAND] = true;
+    }
   }
 #endif
 #ifdef SUNSHINE_BUILD_DRM
-  if(verify_kms()) {
-    if(window_system == window_system_e::WAYLAND) {
-      // On Wayland, using KMS, the cursor is unreliable.
-      // Hide it by default
-      display_cursor = false;
+  if(config::video.capture.empty() || config::video.capture == "kms") {
+    if(verify_kms()) {
+      if(window_system == window_system_e::WAYLAND) {
+        // On Wayland, using KMS, the cursor is unreliable.
+        // Hide it by default
+        display_cursor = false;
+      }
     }
 
     sources[source::KMS] = true;
   }
 #endif
 #ifdef SUNSHINE_BUILD_X11
-  if(verify_x11()) {
-    sources[source::X11] = true;
+  if(config::video.capture.empty() || config::video.capture == "x11") {
+    if(verify_x11()) {
+      sources[source::X11] = true;
+    }
   }
 #endif
 
   if(sources.none()) {
+    BOOST_LOG(error) << "Unable to initialize capture method"sv;
     return nullptr;
   }
 
@@ -555,4 +571,4 @@ std::unique_ptr<deinit_t> init() {
 
   return std::make_unique<deinit_t>();
 }
-} // namespace platf
+} // namespace platf