Refine app resume logic when enabled input only mode

src/nvhttp.cpp

@@ -963,11 +963,12 @@ namespace nvhttp {
 
     if constexpr (std::is_same_v<SunshineHTTPS, T>) {
       int current_appid = 0;
-      if (!config::input.enable_input_only_mode || rtsp_stream::session_count() == 0) {
+      // When input only mode is enabled, the only resume method should be launching the same app again.
+      if (!config::input.enable_input_only_mode) {
         current_appid = proc::proc.running();
       }
       tree.put("root.currentgame", current_appid);
-      tree.put("root.state", current_appid > 0 ? "SUNSHINE_SERVER_BUSY" : "SUNSHINE_SERVER_FREE");
+      tree.put("root.state", proc::proc.running() > 0 ? "SUNSHINE_SERVER_BUSY" : "SUNSHINE_SERVER_FREE");
     } else {
       tree.put("root.currentgame", 0);
       tree.put("root.state", "SUNSHINE_SERVER_FREE");
@@ -1062,7 +1063,11 @@ namespace nvhttp {
         pt::ptree app_node;
 
         app_node.put("IsHdrSupported"s, video::active_hevc_mode == 3 ? 1 : 0);
+        if (should_hide_inactive_apps && appid != input_only_id_int) {
+          app_node.put("AppTitle"s, "Resume: "s + app.name);
+        } else {
           app_node.put("AppTitle"s, app.name);
+        }
         app_node.put("UUID", app.uuid);
         app_node.put("ID", app.id);
 
@@ -1158,6 +1163,8 @@ namespace nvhttp {
       return;
     }
 
+    bool no_active_sessions = rtsp_stream::session_count() == 0;
+
     if (is_input_only) {
       BOOST_LOG(info) << "Launching input only session..."sv;
 
@@ -1166,13 +1173,31 @@ namespace nvhttp {
 
       // Still probe encoders once, if input only session is launched first
       // But we're ignoring if it's successful or not
-      if (rtsp_stream::session_count() == 0 && !proc::proc.virtual_display) {
+      if (no_active_sessions && !proc::proc.virtual_display) {
         video::probe_encoders();
         if (current_appid == 0) {
           proc::proc.launch_input_only();
         }
       }
-    } else if (appid > 0 && appid != current_appid) {
+    } else if (appid > 0) {
+      if (appid == current_appid) {
+        // We're basically resuming the same app
+        if (!proc::proc.allow_client_commands) {
+          launch_session->client_do_cmds.clear();
+          launch_session->client_undo_cmds.clear();
+        }
+
+        if (no_active_sessions && !proc::proc.virtual_display) {
+          display_device::configure_display(config::video, *launch_session);
+          if (video::probe_encoders()) {
+            tree.put("root.resume", 0);
+            tree.put("root.<xmlattr>.status_code", 503);
+            tree.put("root.<xmlattr>.status_message", "Failed to initialize video capture/encoding. Is a display connected and turned on?");
+
+            return;
+          }
+        }
+      } else {
         const auto& apps = proc::proc.get_apps();
         auto app_iter = std::find_if(apps.begin(), apps.end(), [&appid_str](const auto _app) {
           return _app.id == appid_str;
@@ -1204,6 +1229,11 @@ namespace nvhttp {
           return;
         }
       }
+    } else {
+      tree.put("root.<xmlattr>.status_code", 403);
+      tree.put("root.<xmlattr>.status_message", "How did you get here?");
+      tree.put("root.gamesession", 0);
+    }
 
     tree.put("root.<xmlattr>.status_code", 200);
     tree.put("root.sessionUrl0", launch_session->rtsp_url_scheme +