- addedd NCNN model support to rtsp_ai_player

- added printing of inference FPS
- simple AI test bench which can be used to compare models

misc/rtsp_ai_player/src-ncnn/aiengineinferencencnn.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <QObject>
+#include <opencv2/core.hpp>
+#include <ncnn/net.h>
+#include "aiengineinference.h"
+
+
+struct Object
+{
+    cv::Rect_<float> rect;
+    int label;
+    float prob;
+};
+
+
+class AiEngineInferencevNcnn : public AiEngineInference
+{
+    Q_OBJECT
+public:
+    explicit AiEngineInferencevNcnn(QString modelPath, QObject *parent = nullptr);
+    void initialize(int number);
+
+public slots:
+    void performInferenceSlot(cv::Mat frame) override;
+
+private:
+    int detect_yolov8(const cv::Mat& bgr, std::vector<Object>& objects);
+    ncnn::Net yolov8;
+};
+