frame

VideoProsessing/src/main.cpp

@@ -10,6 +10,11 @@
 #include <opencv4/opencv2/opencv.hpp>
 #include <mqtt/async_client.h>
 #include <nlohmann/json.hpp>
+#include <mutex>
+#include <vector>
+#include <queue>
+#include <condition_variable>
+#include <atomic>
 
 using namespace std;
 using namespace cv;
@@ -24,7 +29,21 @@ const string Topic = "/video/PersonData";
 const int Qos = 0;
 mqtt::async_client client(mqtt_url, clientId);
 
-// 函数声明
+// 保存检测结果
+struct Dection
+{
+    int x, y, w, h;
+    double distance;
+};
+
+mutex detMutex;                // 保护latestDection的互斥锁
+vector<Dection> latestDection; // 保存最新接收到的检测结果
+
+mutex alertMutex;                            // 保护alertQueue的互斥锁
+condition_variable alertcv;                  // 通知报警线程有新任务
+queue<nlohmann::json> alertQueue;            // 存放解析后的数据
+std::atomic<bool> alertWorkerRunning{false}; // 工作线程运行标志
+
 // mqtt初始化
 void MqttInit();
 // 摄像头管道初始化
@@ -87,6 +106,44 @@ void MqttInit()
 
     client.connect()->wait();
     client.subscribe(Topic, Qos)->wait();
+
+    // 开启报警线程
+    thread([]()
+           {
+        while (alertWorkerRunning.load())
+        {
+            unique_lock<mutex> lk(alertMutex);
+            // 等待条件,队列非空或者收到停止信号
+            alertcv.wait(lk,[](){
+                return !alertQueue.empty() || !alertWorkerRunning.load();});
+
+            //如果线程应退出切队列为空,退出循环
+            if(alertQueue.empty() && !alertWorkerRunning.load())
+                break;
+            
+            //处理队列中的所有信号
+            while(!alertQueue.empty())
+            {
+                auto job = move(alertQueue.front());
+                alertQueue.pop();   //释放空指针
+                //解锁,以便于增加队列任务
+                lk.unlock();
+
+                //报警处理函数
+                try
+                {
+                    
+                }
+                catch(const std::exception& e)
+                {
+                    std::cerr << e.what() << '\n';
+                }
+
+                lk.lock();  //重新上锁,以继续处理下个任务
+                
+            }
+        } })
+        .detach();
 }
 
 // mqtt接收订阅消息的回调
@@ -98,19 +155,35 @@ void getMsgCallback(mqtt::const_message_ptr msg)
         try {
             // TODO 处理接收到到的位置数据
             auto json = nlohmann::json::parse(payload);
-            //绘制 接收到的坐标 的方框
-            thread([json](){
-                for(auto & ii :json)
-                {
-                    int x = static_cast<int>(ii["x"]);
-                    int y = static_cast<int>(ii["y"]);
-                    int w = static_cast<int>(ii["w"]);
-                    int h = static_cast<int>(ii["h"]);
-                    double distance = static_cast<double>(ii["distance"]);
-                    drawRect(x,y,w,h,distance);
-                }
-            }).detach();
 
+            vector<Dection> dets;
+            dets.reserve(json.size());   //预分配,减少多次分配
+            for(const auto&ii:json)
+            {
+                Dection d;
+                // 使用静态转换确保类型为整数/浮点
+                d.x = static_cast<int>(ii.value("x", 0));
+                d.y = static_cast<int>(ii.value("y", 0));
+                d.w = static_cast<int>(ii.value("w", 0));
+                d.h = static_cast<int>(ii.value("h", 0));
+                d.distance = static_cast<double>(ii.value("distance", 0.0));
+
+                dets.push_back(d);
+            }
+
+            //原子替换最新检测合集
+            {
+                lock_guard<mutex> lk(detMutex);
+                latestDection = move(dets);
+            }
+            
+            {
+                lock_guard<mutex> lk(alertMutex);
+                alertQueue.push(move(json));    //push后通知工作线程
+            }
+
+            //唤醒任务线程
+            alertcv.notify_one();
         }
         catch (const nlohmann::json::parse_error &e) {
             cerr << "JSON 解析错误: " << e.what() << "\n原始 payload: " << payload << "\n";
@@ -180,22 +253,29 @@ bool processFrame(VideoCapture &cap, FILE *pipe, Mat &frame, int64 &count, chron
         return false;
     }
 
-    // 拷贝视频帧
-    handleFrame = frame;
-
-    // FPS计算与显示
-    ++count;
-    auto now = chrono::steady_clock::now();
-    if (chrono::duration_cast<chrono::milliseconds>(now - t0).count() / 1000.0 > 1.0)
-    {
-        string fps = "FPS:" + to_string(count);
-        count = 0;
-        t0 = now;
-    }
-
     // 写入管道
     fwrite(frame.data, 1, frame.total() * frame.elemSize(), pipe);
     fflush(pipe);
+
+    // 拷贝视频帧
+    handleFrame = frame;
+
+    // 读取最新检测:短锁获取并将结果拷贝到本地变量
+    vector<Dection> destCopy;
+
+    {
+        lock_guard<mutex> lk(detMutex);
+        destCopy = latestDection; // 复制到本地后释放锁
+    }
+
+    // 在主线程上进行绘制
+    for (const auto &ii : destCopy)
+    {
+        drawRect(ii.x, ii.y, ii.w, ii.h, ii.distance);
+    }
+
+    latestDection.clear();
+
     // 可选：显示窗口
     // imshow("测试画面", frame);