first commit

nodes/vp_file_src_node.cpp

@@ -0,0 +1,134 @@
+
+#include <iostream>
+
+#include "../utils/logger/vp_logger.h"
+#include "vp_file_src_node.h"
+
+namespace vp_nodes {
+        
+    vp_file_src_node::vp_file_src_node(std::string node_name, 
+                                        int channel_index, 
+                                        std::string file_path, 
+                                        float resize_ratio, 
+                                        bool cycle,
+                                        std::string gst_decoder_name,
+                                        int skip_interval): 
+                                        vp_src_node(node_name, channel_index, resize_ratio), 
+                                        file_path(file_path), 
+                                        cycle(cycle), gst_decoder_name(gst_decoder_name), skip_interval(skip_interval) {
+        assert(skip_interval >= 0 && skip_interval <= 9);
+        this->gst_template = vp_utils::string_format(this->gst_template, file_path.c_str(), gst_decoder_name.c_str());
+        VP_INFO(vp_utils::string_format("[%s] [%s]", node_name.c_str(), gst_template.c_str()));
+        this->initialized();
+    }
+    
+    vp_file_src_node::~vp_file_src_node() {
+        deinitialized();
+    }
+    
+    // define how to read video from local file, create frame meta etc.
+    // please refer to the implementation of vp_node::handle_run.
+    void vp_file_src_node::handle_run() {
+        cv::Mat frame;
+        int video_width = 0;
+        int video_height = 0;
+        int fps = 0;
+        std::chrono::milliseconds delta;
+        int skip = 0;
+
+        while(alive) {
+            // check if need work
+            gate.knock();
+
+            auto last_time = std::chrono::system_clock::now();
+            // try to open capture
+            if (!file_capture.isOpened()) {
+                if(!file_capture.open(this->gst_template, cv::CAP_GSTREAMER)) {
+                    VP_WARN(vp_utils::string_format("[%s] open file failed, try again...", node_name.c_str()));
+                    continue;
+                }
+            }
+
+            // video properties
+            if (video_width == 0 || video_height == 0 || fps == 0) {
+                video_width = file_capture.get(cv::CAP_PROP_FRAME_WIDTH);
+                video_height = file_capture.get(cv::CAP_PROP_FRAME_HEIGHT);
+                fps = file_capture.get(cv::CAP_PROP_FPS);
+                delta = std::chrono::milliseconds(1000 / fps) * (skip_interval + 1);
+    
+                original_fps = fps;
+                original_width = video_width;
+                original_height = video_height;
+
+                // set true fps because skip some frames
+                fps = fps / (skip_interval + 1);
+            }
+            // stream_info_hooker activated if need
+            vp_stream_info stream_info {channel_index, original_fps, original_width, original_height, to_string()};
+            invoke_stream_info_hooker(node_name, stream_info);
+            
+            file_capture >> frame;
+            if(frame.empty()) {
+                VP_INFO(vp_utils::string_format("[%s] reading frame complete, total frame==>%d", node_name.c_str(), frame_index));
+                if (cycle) {
+                    VP_INFO(vp_utils::string_format("[%s] cycle flag is true, continue!", node_name.c_str()));
+                    file_capture.set(cv::CAP_PROP_POS_FRAMES, 0);
+                }
+                continue;
+            }
+
+            // need skip
+            if (skip < skip_interval) {
+                skip++;
+                continue;
+            }
+            skip = 0;
+
+            // need resize
+            cv::Mat resize_frame;
+            if (this->resize_ratio != 1.0f) {                 
+                cv::resize(frame, resize_frame, cv::Size(), resize_ratio, resize_ratio);
+            }
+            else {
+                resize_frame = frame.clone();  // clone!
+            }
+            // set true size because resize
+            video_width = resize_frame.cols;
+            video_height = resize_frame.rows;
+
+            this->frame_index++;
+            // create frame meta
+            auto out_meta = 
+                std::make_shared<vp_objects::vp_frame_meta>(resize_frame, this->frame_index, this->channel_index, video_width, video_height, fps);
+
+            if (out_meta != nullptr) {
+                this->out_queue.push(out_meta);
+
+                // handled hooker activated if need
+                if (this->meta_handled_hooker) {
+                    meta_handled_hooker(node_name, out_queue.size(), out_meta);
+                }
+
+                // important! notify consumer of out_queue in case it is waiting.
+                this->out_queue_semaphore.signal();
+                VP_DEBUG(vp_utils::string_format("[%s] after handling meta, out_queue.size()==>%d", node_name.c_str(), out_queue.size()));
+            }
+
+            // for fps
+            auto snap = std::chrono::system_clock::now() - last_time;
+            snap = std::chrono::duration_cast<std::chrono::milliseconds>(snap);
+            if (snap < delta) {
+                std::this_thread::sleep_for(delta - snap);
+            }
+        }
+
+        // send dead flag for dispatch_thread
+        this->out_queue.push(nullptr);
+        this->out_queue_semaphore.signal();        
+    }
+
+    // return stream path
+    std::string vp_file_src_node::to_string() {
+        return file_path;
+    }
+}