first commit

nodes/vp_file_des_node.h

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+#pragma once
+
+#include <iostream>
+#include <memory>
+#include <chrono>
+// compile tips:
+// remove experimental/ if gcc >= 8.0
+#include <experimental/filesystem>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/videoio.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 {
+    // file des node, save stream to local file
+    class vp_file_des_node: public vp_des_node {
+    private:
+        /* data */
+        std::string gst_template = "appsrc ! videoconvert ! %s bitrate=%d ! mp4mux ! filesink location=%s";
+        cv::VideoWriter file_writer;
+
+        int frames_already_record = -1;
+        int frames_need_record = 0;
+
+        // create file name
+        // example: save_dir/name_prefix_stamp.mp4
+        std::string get_new_file_name();
+    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_file_des_node(std::string node_name, 
+                        int channel_index, 
+                        std::string save_dir,
+                        std::string name_prefix = "",
+                        int max_duration_for_single_file = 2,
+                        vp_objects::vp_size resolution_w_h = {},
+                        int bitrate = 1024,
+                        bool osd = true,
+                        std::string gst_encoder_name = "x264enc");
+        ~vp_file_des_node();
+
+        // save directory
+        std::string save_dir;
+        // prefix of file name
+        std::string name_prefix;
+        // max duration for single file (minutes)
+        int max_duration_for_single_file;
+
+        vp_objects::vp_size resolution_w_h;
+        int bitrate;
+        bool osd;
+        // set x264enc as the default encoder, we can use hardware encoder instead.
+        std::string gst_encoder_name = "x264enc";
+    };
+
+}