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#include "vp_image_src_node.h"
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namespace vp_nodes {
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vp_image_src_node::vp_image_src_node(std::string node_name,
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int channel_index,
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std::string port_or_location,
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int interval,
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float resize_ratio,
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bool cycle,
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std::string gst_decoder_name):
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vp_src_node(node_name, channel_index, resize_ratio),
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port_or_location(port_or_location),
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interval(interval),
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cycle(cycle), gst_decoder_name(gst_decoder_name) {
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// make sure not greater than 1 minute (too long) and not lower than 1 second (since it's too quick, use video stream instead directly)
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assert(interval >= 1 && interval <= 60);
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if (vp_utils::ends_with(port_or_location, "jpeg") || vp_utils::ends_with(port_or_location, "jpg")) {
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// read from file
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gst_template_file = vp_utils::string_format(gst_template_file, port_or_location.c_str(), cycle ? std::string("true").c_str() : std::string("false").c_str(), gst_decoder_name.c_str(), interval);
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from_file = true;
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}
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else if (port_or_location.find_first_not_of("0123456789") == std::string::npos) {
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// receive from remote via udp
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auto port = std::stoi(port_or_location); // try to get port
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gst_template_udp = vp_utils::string_format(gst_template_udp, port, gst_decoder_name.c_str(), interval);
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from_file = false;
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}
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else {
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throw "invalid input parameter for `port_or_location`!";
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}
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auto s = from_file ? gst_template_file : gst_template_udp;
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VP_INFO(vp_utils::string_format("[%s] [%s]", node_name.c_str(), s.c_str()));
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this->initialized();
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}
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vp_image_src_node::~vp_image_src_node() {
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deinitialized();
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}
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void vp_image_src_node::handle_run() {
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cv::Mat frame;
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int video_width = 0;
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int video_height = 0;
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int fps = 0;
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std::chrono::milliseconds delta;
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while(alive) {
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// check if need work
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gate.knock();
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auto last_time = std::chrono::system_clock::now();
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// try to open capture
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if (!image_capture.isOpened()) {
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auto gst_launch_str = from_file ? gst_template_file : gst_template_udp;
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if(!image_capture.open(gst_launch_str, cv::CAP_GSTREAMER)) {
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VP_WARN(vp_utils::string_format("[%s] open image capture failed, try again...", node_name.c_str()));
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continue;
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}
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}
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// video properties
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if (video_width == 0 || video_height == 0 || fps == 0) {
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video_width = image_capture.get(cv::CAP_PROP_FRAME_WIDTH);
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video_height = image_capture.get(cv::CAP_PROP_FRAME_HEIGHT);
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fps = image_capture.get(cv::CAP_PROP_FPS);
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fps = fps < 1 ? 1 : fps; // since fps is too small (0.1 means 1 frame every 10 seconds)
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delta = std::chrono::milliseconds(1000 / fps);
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original_fps = fps;
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original_width = video_width;
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original_height = video_height;
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}
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// stream_info_hooker activated if need
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vp_stream_info stream_info {channel_index, original_fps, original_width, original_height, to_string()};
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invoke_stream_info_hooker(node_name, stream_info);
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image_capture >> frame;
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if(frame.empty()) {
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VP_WARN(vp_utils::string_format("[%s] reading frame empty, total frame==>%d", node_name.c_str(), frame_index));
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continue;
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}
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// need resize
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cv::Mat resize_frame;
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if (this->resize_ratio != 1.0f) {
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cv::resize(frame, resize_frame, cv::Size(), resize_ratio, resize_ratio);
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}
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else {
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resize_frame = frame.clone(); // clone!
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}
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// set true size because resize
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video_width = resize_frame.cols;
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video_height = resize_frame.rows;
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this->frame_index++;
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// create frame meta
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auto out_meta =
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std::make_shared<vp_objects::vp_frame_meta>(resize_frame, this->frame_index, this->channel_index, video_width, video_height, fps);
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if (out_meta != nullptr) {
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this->out_queue.push(out_meta);
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// handled hooker activated if need
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if (this->meta_handled_hooker) {
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meta_handled_hooker(node_name, out_queue.size(), out_meta);
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}
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// important! notify consumer of out_queue in case it is waiting.
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this->out_queue_semaphore.signal();
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VP_DEBUG(vp_utils::string_format("[%s] after handling meta, out_queue.size()==>%d", node_name.c_str(), out_queue.size()));
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}
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// for fps
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auto snap = std::chrono::system_clock::now() - last_time;
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snap = std::chrono::duration_cast<std::chrono::milliseconds>(snap);
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if (snap < delta) {
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std::this_thread::sleep_for(delta - snap);
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}
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}
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// send dead flag for dispatch_thread
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this->out_queue.push(nullptr);
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this->out_queue_semaphore.signal();
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}
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std::string vp_image_src_node::to_string() {
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return from_file ? port_or_location : "udp://127.0.0.1:" + port_or_location + "/jpg";
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}
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}
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