新增 Mjpegplayer 用来播放 Web 流

SHH.MjpegPlayer/Core/Models/SessionInfo.cs

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+namespace SHH.MjpegPlayer
+{
+    /// <summary>
+    /// 会话信息
+    /// </summary>
+    public class SessionInfo
+    {
+        #region Key
+
+        /// <summary>流标识</summary>
+        public string? Key => $"{DeviceId}#{TypeCode}";
+
+        #endregion
+
+        #region DeviceId
+
+        /// <summary>设备类型</summary>
+        public string? DeviceId { get; set; }
+
+        #endregion
+
+        #region TypeCode
+
+        /// <summary>类型编码</summary>
+        public string? TypeCode { get; set; }
+
+        #endregion
+
+        #region ClientIp
+
+        /// <summary>客户端 IP</summary>
+        public string? ClientIp { get; set; }
+
+        #endregion
+
+        #region ClientPort
+
+        /// <summary>客户端端口</summary>
+        public int ClientPort { get; set; }
+
+        #endregion
+
+        #region Message
+
+        /// <summary>消息</summary>
+        public string? Message { get; set; }
+
+        #endregion
+
+        #region AcceptTime
+
+        /// <summary>接入时间</summary>
+        public DateTime AcceptTime { get; set; }
+
+        #endregion
+
+        #region Counter
+
+        /// <summary>计数器</summary>
+        public SumByTime? Counter { get; init; }
+
+        #endregion
+
+        // =======================================================
+        // [新增] 专门给诊断大屏用的属性，前端可直接读取数值
+        // =======================================================
+
+        /// <summary>接收帧率 (源头健康度)</summary>
+        public int RecvFps
+        {
+            get
+            {
+                if (Counter == null || Counter.TotalSecond == null) return 0;
+
+                // 从字典中安全获取 "接收帧数"
+                if (Counter.TotalSecond.TryGetValue("接收帧数", out uint val))
+                {
+                    return (int)val;
+                }
+                return 0;
+            }
+        }
+
+        /// <summary>播放/发送帧率 (客户端健康度)</summary>
+        public int PlayFps
+        {
+            get
+            {
+                if (Counter == null || Counter.TotalSecond == null) return 0;
+
+                // 从字典中安全获取 "播放帧数"
+                if (Counter.TotalSecond.TryGetValue("播放帧数", out uint val))
+                {
+                    return (int)val;
+                }
+                return 0;
+            }
+        }
+    }
+}