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#include "vp_udp_src_node.h"
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#include "../utils/vp_utils.h"
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namespace vp_nodes {
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vp_udp_src_node::vp_udp_src_node(std::string node_name,
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int channel_index,
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int port,
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float resize_ratio,
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std::string gst_decoder_name,
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int skip_interval):
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vp_src_node(node_name, channel_index, resize_ratio),
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port(port), gst_decoder_name(gst_decoder_name), skip_interval(skip_interval) {
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assert(skip_interval >= 0 && skip_interval <= 9);
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this->gst_template = vp_utils::string_format(this->gst_template, port, gst_decoder_name.c_str());
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VP_INFO(vp_utils::string_format("[%s] [%s]", node_name.c_str(), gst_template.c_str()));
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this->initialized();
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}
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vp_udp_src_node::~vp_udp_src_node() {
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deinitialized();
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}
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// define how to receive video stream via udp, create frame meta etc.
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// please refer to the implementation of vp_node::handle_run.
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void vp_udp_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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int skip = 0;
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while(alive) {
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// check if need work
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gate.knock();
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// try to open capture
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if (!udp_capture.isOpened()) {
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if (!udp_capture.open(this->gst_template, cv::CAP_GSTREAMER)) {
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VP_WARN(vp_utils::string_format("[%s] open udp 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 = udp_capture.get(cv::CAP_PROP_FRAME_WIDTH);
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video_height = udp_capture.get(cv::CAP_PROP_FRAME_HEIGHT);
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fps = udp_capture.get(cv::CAP_PROP_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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// set true fps because skip some frames
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fps = fps / (skip_interval + 1);
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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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udp_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 skip
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if (skip < skip_interval) {
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skip++;
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continue;
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}
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skip = 0;
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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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}
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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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// return stream uri
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std::string vp_udp_src_node::to_string() {
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return "udp://127.0.0.1:" + std::to_string(port);
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}
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}
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