videoReader.cpp

/*
 * ViSP, open source Visual Servoing Platform software.
 * Copyright (C) 2005 - 2025 by Inria. All rights reserved.
 *
 * This software is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See https://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Reading a video file.
 */


 
#include <visp3/core/vpConfig.h>
#include <visp3/core/vpDebug.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpIoTools.h>
#include <visp3/gui/vpDisplayFactory.h>
#include <visp3/io/vpImageIo.h>
#include <visp3/io/vpParseArgv.h>
#include <visp3/io/vpVideoReader.h>
 
#if defined(VISP_HAVE_DISPLAY)
 
// List of allowed command line options
#define GETOPTARGS "cdi:p:h"
 
#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif
 
void usage(const char *name, const char *badparam, const std::string &ipath, const std::string &ppath);
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath, bool &click_allowed,
                bool &display);

void usage(const char *name, const char *badparam, const std::string &ipath, const std::string &ppath)
{
  fprintf(stdout, "\n\
Read a video file on the disk.\n\
\n\
SYNOPSIS\n\
  %s [-i <input video path>] \n\
     [-h]\n\
",
name);
 
  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -i <input video path>                                %s\n\
     Set video input path.\n\
     From this path read \"video/cube.mpeg\"\n\
     video.\n\
     Setting the VISP_INPUT_IMAGE_PATH environment\n\
     variable produces the same behaviour than using\n\
     this option.\n\
\n\
  -p <personal video path>                             %s\n\
     Specify a personal folder containing a video \n\
     to process.\n\
     Example : \"/Temp/visp-images/video/video.mpeg\"\n\
\n\
  -c\n\
     Disable the mouse click. Useful to automate the \n\
     execution of this program without human intervention.\n\
\n\
  -d \n\
     Turn off the display.\n\
\n\
  -h\n\
     Print the help.\n\n",
          ipath.c_str(), ppath.c_str());
 
  if (badparam) {
    fprintf(stderr, "ERROR: \n");
    fprintf(stderr, "\nBad parameter [%s]\n", badparam);
  }
}
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath, bool &click_allowed, bool &display)
{
  const char *optarg_;
  int c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {
 
    switch (c) {
    case 'c':
      click_allowed = false;
      break;
    case 'd':
      display = false;
      break;
    case 'i':
      ipath = optarg_;
      break;
    case 'p':
      ppath = optarg_;
      break;
    case 'h':
      usage(argv[0], nullptr, ipath, ppath);
      return false;
 
    default:
      usage(argv[0], optarg_, ipath, ppath);
      return false;
    }
  }
 
  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], nullptr, ipath, ppath);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg_ << std::endl << std::endl;
    return false;
  }
 
  return true;
}
 
int main(int argc, const char **argv)
{
#if (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
  std::shared_ptr<vpDisplay> display;
#else
  vpDisplay *display = nullptr;
#endif
  try {
    std::string env_ipath;
    std::string opt_ipath;
    std::string ipath;
    std::string opt_ppath;
    std::string filename;
    bool opt_click_allowed = true;
    bool opt_display = true;
 
    std::cout << "-------------------------------------------------------" << std::endl;
    std::cout << "  videoReader.cpp" << std::endl << std::endl;
 
    std::cout << "  reading a video file" << std::endl;
    std::cout << "-------------------------------------------------------" << std::endl;
    std::cout << std::endl;
 
    // Get the visp-images-data package path or VISP_INPUT_IMAGE_PATH
    // environment variable value
    env_ipath = vpIoTools::getViSPImagesDataPath();
 
    // Set the default input path
    if (!env_ipath.empty())
      ipath = env_ipath;
 
    // Read the command line options
    if (getOptions(argc, argv, opt_ipath, opt_ppath, opt_click_allowed, opt_display) == false) {
      return EXIT_FAILURE;
    }
 
    // Get the option values
    if (!opt_ipath.empty())
      ipath = opt_ipath;
 
    // Compare ipath and env_ipath. If they differ, we take into account
    // the input path coming from the command line option
    if (!opt_ipath.empty() && !env_ipath.empty() && opt_ppath.empty()) {
      if (ipath != env_ipath) {
        std::cout << std::endl << "WARNING: " << std::endl;
        std::cout << "  Since -i <visp image path=" << ipath << "> "
          << "  is different from VISP_IMAGE_PATH=" << env_ipath << std::endl
          << "  we skip the environment variable." << std::endl;
      }
    }
 
    // Test if an input path is set
    if (opt_ipath.empty() && env_ipath.empty() && opt_ppath.empty()) {
      usage(argv[0], nullptr, ipath, opt_ppath);
      std::cerr << std::endl << "ERROR:" << std::endl;
      std::cerr << "  Use -i <visp image path> option or set VISP_INPUT_IMAGE_PATH " << std::endl
        << "  environment variable to specify the location of the " << std::endl
        << "  video path where test images are located." << std::endl
        << std::endl;
      return EXIT_FAILURE;
    }

 
    // vpImage is a template class you can declare vpImage of ...
    // everything...
    vpImage<vpRGBa> I;
 
    // Create the video Reader
    vpVideoReader reader;
 
#if defined(VISP_HAVE_DATASET)
#if VISP_HAVE_DATASET_VERSION >= 0x030702
    std::string video("video/cube.mp4");
#else
    std::string video("video/cube.mpeg");
#endif
#else
    // We suppose that the user will download a recent dataset
    std::string video("video/cube.mp4");
#endif
 
    if (opt_ppath.empty()) {
      filename = vpIoTools::createFilePath(ipath, video);
    }
    else {
      filename.assign(opt_ppath);
    }
 
    // Initialize the reader and get the first frame.
    std::cout << "Process video in " << filename << std::endl;
    reader.setFileName(filename);
    reader.open(I);
 
    if (opt_display) {
      // Display size is automatically defined by the image (I) size
#if (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
      display = vpDisplayFactory::createDisplay(I, 100, 100, "Display video frame");
#else
      display = vpDisplayFactory::allocateDisplay(I, 100, 100, "Display video frame");
#endif
      vpDisplay::display(I);
      vpDisplay::flush(I);
    }
 
    //   if (opt_display && opt_click_allowed)
    //   {
    //     std::cout << "Click on the image to read and display the last key
    //     frame" << std::endl; vpDisplay::getClick(I);
    //   }
    //
    //   reader.getFrame(I,reader.getLastFrameIndex());
    //
    //   if (opt_display)
    //   {
    //     vpDisplay::display(I) ;
    //     vpDisplay::flush(I);
    //   }
 
    if (opt_display && opt_click_allowed) {
      std::cout << "Click to see the video" << std::endl;
      vpDisplay::getClick(I);
    }
 
    while (!reader.end()) {
      reader.acquire(I);
      std::cout << "Display frame: " << reader.getFrameIndex() << std::endl;
      if (opt_display) {
        vpDisplay::display(I);
        if (opt_click_allowed) {
          vpDisplay::displayText(I, 15, 15, "A click to stop...", vpColor::red);
 
          if (vpDisplay::getClick(I, false)) {
            break;
          }
        }
        vpDisplay::flush(I);
      }
    }
 
    if (opt_display && opt_click_allowed) {
      std::cout << "Click to exit this example" << std::endl;
      vpDisplay::getClick(I);
    }
  }
  catch (const vpException &e) {
    std::cout << "Catch an exception: " << e << std::endl;
  }
#if (VISP_CXX_STANDARD < VISP_CXX_STANDARD_11)
  if (display != nullptr) {
    delete display;
  }
#endif
  return EXIT_SUCCESS;
}
#else
int main()
{
  std::cout << "Sorry, no display is available. We quit this example." << std::endl;
  return EXIT_SUCCESS;
}
#endif