rgb_encoding_mobilenet.cpp

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#include <iostream>
 
// Includes common necessary includes for development using depthai library
#include "depthai/depthai.hpp"
 
// MobilenetSSD label texts
static const std::vector<std::string> labelMap = {"background", "aeroplane", "bicycle",     "bird",  "boat",        "bottle", "bus",
                                                  "car",        "cat",       "chair",       "cow",   "diningtable", "dog",    "horse",
                                                  "motorbike",  "person",    "pottedplant", "sheep", "sofa",        "train",  "tvmonitor"};
 
int main(int argc, char** argv) {
    using namespace std;
    // Default blob path provided by Hunter private data download
    // Applicable for easier example usage only
    std::string nnPath(BLOB_PATH);
 
    // If path to blob specified, use that
    if(argc > 1) {
        nnPath = std::string(argv[1]);
    }
 
    // Print which blob we are using
    printf("Using blob at path: %s\n", nnPath.c_str());
 
    // Create pipeline
    dai::Pipeline pipeline;
 
    // Define sources and outputs
    auto camRgb = pipeline.create<dai::node::ColorCamera>();
    auto videoEncoder = pipeline.create<dai::node::VideoEncoder>();
    auto nn = pipeline.create<dai::node::MobileNetDetectionNetwork>();
 
    auto xoutRgb = pipeline.create<dai::node::XLinkOut>();
    auto videoOut = pipeline.create<dai::node::XLinkOut>();
    auto nnOut = pipeline.create<dai::node::XLinkOut>();
 
    xoutRgb->setStreamName("rgb");
    videoOut->setStreamName("h265");
    nnOut->setStreamName("nn");
 
    // Properties
    camRgb->setBoardSocket(dai::CameraBoardSocket::CAM_A);
    camRgb->setResolution(dai::ColorCameraProperties::SensorResolution::THE_1080_P);
    camRgb->setPreviewSize(300, 300);
    camRgb->setInterleaved(false);
 
    videoEncoder->setDefaultProfilePreset(30, dai::VideoEncoderProperties::Profile::H265_MAIN);
 
    nn->setConfidenceThreshold(0.5);
    nn->setBlobPath(nnPath);
    nn->setNumInferenceThreads(2);
    nn->input.setBlocking(false);
 
    // Linking
    camRgb->video.link(videoEncoder->input);
    camRgb->preview.link(xoutRgb->input);
    camRgb->preview.link(nn->input);
    videoEncoder->bitstream.link(videoOut->input);
    nn->out.link(nnOut->input);
 
    // Connect to device and start pipeline
    dai::Device device(pipeline);
 
    // Queues
    int queueSize = 8;
    auto qRgb = device.getOutputQueue("rgb", queueSize);
    auto qDet = device.getOutputQueue("nn", queueSize);
    auto qRgbEnc = device.getOutputQueue("h265", 30, true);
 
    cv::Mat frame;
    std::vector<dai::ImgDetection> detections;
 
    // Add bounding boxes and text to the frame and show it to the user
    auto displayFrame = [](std::string name, cv::Mat frame, std::vector<dai::ImgDetection>& detections) {
        auto color = cv::Scalar(255, 0, 0);
        // nn data, being the bounding box locations, are in <0..1> range - they need to be normalized with frame width/height
        for(auto& detection : detections) {
            int x1 = detection.xmin * frame.cols;
            int y1 = detection.ymin * frame.rows;
            int x2 = detection.xmax * frame.cols;
            int y2 = detection.ymax * frame.rows;
 
            uint32_t labelIndex = detection.label;
            std::string labelStr = to_string(labelIndex);
            if(labelIndex < labelMap.size()) {
                labelStr = labelMap[labelIndex];
            }
            cv::putText(frame, labelStr, cv::Point(x1 + 10, y1 + 20), cv::FONT_HERSHEY_TRIPLEX, 0.5, color);
            std::stringstream confStr;
            confStr << std::fixed << std::setprecision(2) << detection.confidence * 100;
            cv::putText(frame, confStr.str(), cv::Point(x1 + 10, y1 + 40), cv::FONT_HERSHEY_TRIPLEX, 0.5, color);
            cv::rectangle(frame, cv::Rect(cv::Point(x1, y1), cv::Point(x2, y2)), color, cv::FONT_HERSHEY_SIMPLEX);
        }
        // Show the frame
        cv::imshow(name, frame);
    };
 
    auto videoFile = std::ofstream("video.h264", std::ios::binary);
 
    while(true) {
        auto inRgb = qRgb->tryGet<dai::ImgFrame>();
        auto inDet = qDet->tryGet<dai::ImgDetections>();
 
        auto out = qRgbEnc->get<dai::ImgFrame>();
        videoFile.write((char*)out->getData().data(), out->getData().size());
 
        if(inRgb) {
            frame = inRgb->getCvFrame();
        }
 
        if(inDet) {
            detections = inDet->detections;
        }
 
        if(!frame.empty()) {
            displayFrame("rgb", frame, detections);
        }
 
        int key = cv::waitKey(1);
        if(key == 'q' || key == 'Q') {
            break;
        }
    }
    cout << "To view the encoded data, convert the stream file (.h265) into a video file (.mp4), using a command below:" << endl;
    cout << "ffmpeg -framerate 30 -i video.h264 -c copy video.mp4" << endl;
    return 0;
}