[feat] add DeskHub stream controls and network status

apps/desktop/src/gui/runtime/received_video_stats.h

@@ -0,0 +1,72 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-12
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _RECEIVED_VIDEO_STATS_H_
+#define _RECEIVED_VIDEO_STATS_H_
+
+#include <chrono>
+#include <cmath>
+#include <mutex>
+#include <optional>
+
+namespace crossdesk::gui_detail {
+// Measured at decode delivery, including wall-only and background sessions.
+// Independent of the selected window's presentation cadence and FPS setting.
+class ReceivedVideoStats {
+ public:
+  using Clock = std::chrono::steady_clock;
+  struct Snapshot {
+    int width = 0;
+    int height = 0;
+    std::optional<int> fps;
+  };
+
+  void Record(int width, int height, Clock::time_point now = Clock::now()) {
+    if (width <= 0 || height <= 0) return;
+    std::lock_guard lock(mutex_);
+    const bool restart = snapshot_.width == 0 ||
+                         now - last_frame_ >= std::chrono::seconds(3);
+    snapshot_.width = width;
+    snapshot_.height = height;
+    last_frame_ = now;
+    if (restart) {
+      started_ = now;
+      frames_ = 0;
+      snapshot_.fps.reset();
+      return;
+    }
+    ++frames_;
+    const double elapsed = std::chrono::duration<double>(now - started_).count();
+    if (elapsed >= 1.0) {
+      snapshot_.fps = static_cast<int>(std::lround(frames_ / elapsed));
+      frames_ = 0;
+      started_ = now;
+    }
+  }
+
+  Snapshot Get(Clock::time_point now = Clock::now()) const {
+    std::lock_guard lock(mutex_);
+    auto result = snapshot_;
+    if (result.width > 0 && now - last_frame_ >= std::chrono::seconds(1))
+      result.fps = 0;
+    return result;
+  }
+
+  void Reset() {
+    std::lock_guard lock(mutex_);
+    snapshot_ = {};
+    frames_ = 0;
+    started_ = last_frame_ = {};
+  }
+
+ private:
+  mutable std::mutex mutex_;
+  Snapshot snapshot_;
+  unsigned frames_ = 0;
+  Clock::time_point started_{}, last_frame_{};
+};
+}  // namespace crossdesk::gui_detail
+#endif