tutorial-video-reader.cpp

#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/core/vpTime.h>
#include <visp3/io/vpVideoReader.h>

int main(int argc, char **argv)
{
#if (VISP_HAVE_OPENCV_VERSION >= 0x020100)
  try {
    std::string videoname = "video.mp4";

    for (int i = 0; i < argc; i++) {
      if (std::string(argv[i]) == "--name")
        videoname = std::string(argv[i + 1]);
      else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
        std::cout << "\nUsage: " << argv[0]
                  << " [--name <video name> (default: " << videoname << ")]"
                  << " [--help] [-h]\n" << std::endl;
        return 0;
      }
    }

    vpImage<unsigned char> I;
    vpVideoReader g;
    g.setFileName(videoname);
    g.open(I);
    std::cout << "Video name     : " << videoname << std::endl;
    std::cout << "Video framerate: " << g.getFramerate() << "Hz" << std::endl;
    std::cout << "Video dimension: " << I.getWidth() << " " << I.getHeight() << std::endl;

#ifdef VISP_HAVE_X11
    vpDisplayX d(I);
#elif defined(VISP_HAVE_GDI)
    vpDisplayGDI d(I);
#elif defined(VISP_HAVE_OPENCV)
    vpDisplayOpenCV d(I);
#else
    std::cout << "No image viewer is available..." << std::endl;
#endif
    vpDisplay::setTitle(I, "Video reader");

    unsigned cpt = 1;
    while (!g.end()) {
      double t = vpTime::measureTimeMs();
      g.acquire(I);
      vpDisplay::display(I);
      vpDisplay::displayText(I, 20, 20, "Click to quit", vpColor::red);
      std::stringstream ss;
      ss << "Frame: " << cpt ++;
      vpDisplay::displayText(I, 40, 20, ss.str(), vpColor::red);
      vpDisplay::flush(I);
      if (vpDisplay::getClick(I, false))
        break;
      vpTime::wait(t, 1000. / g.getFramerate());
    }
    std::cout << "End of video was reached" << std::endl;
  } catch (const vpException &e) {
    std::cout << e.getMessage() << std::endl;
  }
#else
  (void)argc;
  (void)argv;
  std::cout << "Install OpenCV and rebuild ViSP to use this example." << std::endl;
#endif
}