first commit

nodes/vp_app_des_node.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <iostream>
+#include <memory>
+#include <chrono>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+
+#include "vp_des_node.h"
+#include "../objects/vp_frame_meta.h"
+#include "../objects/vp_control_meta.h"
+#include "../utils/vp_utils.h"
+
+
+namespace vp_nodes {
+    // callback before data disappear inside vp_app_des_node
+    typedef std::function<void(std::string, std::shared_ptr<vp_objects::vp_meta>)> vp_app_des_result_hooker;
+
+    // app des node, send meta data to external host code using callbacks.
+    class vp_app_des_node: public vp_des_node {
+    private:
+        /* data */
+        vp_app_des_result_hooker app_des_result_hooker;
+
+        void invoke_app_des_result_hooker(std::shared_ptr<vp_objects::vp_meta> meta);
+    protected:
+        // re-implementation, return nullptr.
+        virtual std::shared_ptr<vp_objects::vp_meta> handle_frame_meta(std::shared_ptr<vp_objects::vp_frame_meta> meta) override; 
+        // re-implementation, return nullptr.
+        virtual std::shared_ptr<vp_objects::vp_meta> handle_control_meta(std::shared_ptr<vp_objects::vp_control_meta> meta) override;
+    public:
+        vp_app_des_node(std::string node_name, 
+                        int channel_index);
+        ~vp_app_des_node();
+
+        void set_app_des_result_hooker(vp_app_des_result_hooker app_des_result_hooker);
+    };
+}