[feat] add fps display in net traffic stats window

src/single_window/control_bar.cpp

@@ -314,6 +314,11 @@ int Render::NetTrafficStats(std::shared_ptr<SubStreamWindowProperties>& props) {
     ImGui::TableNextColumn();
     LossRateDisplay(props->net_traffic_stats_.total_inbound_stats.loss_rate);
 
+    ImGui::TableNextColumn();
+    ImGui::Text("FPS");
+    ImGui::TableNextColumn();
+    ImGui::Text("%d", props->fps_);
+
     ImGui::EndTable();
   }
 

src/single_window/render.h

@@ -65,7 +65,7 @@ class Render {
     float control_window_min_width_ = 20;
     float control_window_max_width_ = 230;
     float control_window_min_height_ = 40;
-    float control_window_max_height_ = 150;
+    float control_window_max_height_ = 170;
     float control_window_width_ = 230;
     float control_window_height_ = 40;
     float control_bar_pos_x_ = 0;
@@ -110,6 +110,9 @@ class Render {
     ImVec2 control_window_pos_;
     ConnectionStatus connection_status_ = ConnectionStatus::Closed;
     TraversalMode traversal_mode_ = TraversalMode::UnknownMode;
+    int fps_ = 0;
+    int frame_count_ = 0;
+    std::chrono::steady_clock::time_point last_time_;
     XNetTrafficStats net_traffic_stats_;
   };
 

src/single_window/render_callback_func.cpp

@@ -233,6 +233,20 @@ void Render::OnReceiveVideoBufferCb(const XVideoFrame* video_frame,
     event.user.data1 = props;
     SDL_PushEvent(&event);
     props->streaming_ = true;
+
+    if (props->net_traffic_stats_button_pressed_) {
+      props->frame_count_++;
+      auto now = std::chrono::steady_clock::now();
+      auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
+                         now - props->last_time_)
+                         .count();
+
+      if (elapsed >= 1000) {
+        props->fps_ = props->frame_count_ * 1000 / elapsed;
+        props->frame_count_ = 0;
+        props->last_time_ = now;
+      }
+    }
   }
 }