Visual Servoing Platform  version 3.2.0 under development (2018-12-12)
grabDirectShow.cpp

Example of framegrabbing using vpDirectShowGrabber class.

Grab grey level images using DirectShow frame grabbing capabilities. Display the images using the GTK or GDI display.

/****************************************************************************
*
* This file is part of the ViSP software.
* Copyright (C) 2005 - 2017 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 http://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:
* Acquire images using DirectShow (under Windows only) and display it
* using GTK or GDI.
*
* Authors:
* Bruno Renier
* Fabien Spindler
*
*****************************************************************************/
#include <visp3/core/vpConfig.h>
#include <visp3/core/vpDebug.h>
#if defined(VISP_HAVE_DIRECTSHOW)
#if (defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI))
#include <visp3/core/vpImage.h>
#include <visp3/core/vpTime.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/io/vpImageIo.h>
#include <visp3/io/vpParseArgv.h>
#include <visp3/sensor/vpDirectShowGrabber.h>
// List of allowed command line options
#define GETOPTARGS "dhn:o:"
void usage(const char *name, const char *badparam, unsigned &nframes, std::string &opath)
{
fprintf(stdout, "\n\
Acquire images using DirectShow (under Windows only) and display\n\
it using GTK or the windows GDI if GTK is not available.\n\
\n\
SYNOPSIS\n\
%s [-d] [-n] [-o] [-h] \n", name);
fprintf(stdout, "\n\
OPTIONS: Default\n\
-d \n\
Turn off the display.\n\
\n\
-n [%%u] %u\n\
Number of frames to acquire. \n\
\n\
-o [%%s] \n\
Filename for image saving. \n\
Example: -o %s\n\
The %%d is for the image numbering.\n\
\n\
-h \n\
Print the help.\n\
\n", nframes, opath.c_str());
if (badparam) {
fprintf(stderr, "ERROR: \n");
fprintf(stderr, "\nBad parameter [%s]\n", badparam);
}
}
bool getOptions(int argc, const char **argv, bool &display, unsigned &nframes, bool &save, std::string &opath)
{
const char *optarg;
int c;
while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg)) > 1) {
switch (c) {
case 'd':
display = false;
break;
case 'n':
nframes = atoi(optarg);
break;
case 'o':
save = true;
opath = optarg;
break;
case 'h':
usage(argv[0], NULL, nframes, opath);
return false;
break;
default:
usage(argv[0], optarg, nframes, opath);
return false;
break;
}
}
if ((c == 1) || (c == -1)) {
// standalone param or error
usage(argv[0], NULL, nframes, opath);
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)
{
try {
bool opt_display = true;
unsigned nframes = 50;
bool save = false;
// Declare an image. It size is not defined yet. It will be defined when the
// image will acquired the first time.
#ifdef GRAB_COLOR
vpImage<vpRGBa> I; // This is a color image (in RGBa format)
#else
vpImage<unsigned char> I; // This is a B&W image
#endif
// Set default output image name for saving
#ifdef GRAB_COLOR
// Color images will be saved in PGM P6 format
std::string opath = "C:/temp/I%04d.ppm";
#else
// B&W images will be saved in PGM P5 format
std::string opath = "C:/temp/I%04d.pgm";
#endif
// Read the command line options
if (getOptions(argc, argv, opt_display, nframes, save, opath) == false) {
exit(-1);
}
// Create the grabber
// test if a camera is connected
if (grabber->getDeviceNumber() == 0) {
vpCTRACE << "there is no camera detected on your computer." << std::endl;
grabber->close();
exit(0);
}
// Initialize the grabber
grabber->open(I);
// Acquire an image
grabber->acquire(I);
std::cout << "Image size: width : " << I.getWidth() << " height: " << I.getHeight() << std::endl;
// Creates a display
#if defined VISP_HAVE_GTK
vpDisplayGTK display;
#elif defined VISP_HAVE_GDI
vpDisplayGDI display;
#endif
if (opt_display) {
display.init(I, 100, 100, "DirectShow Framegrabber");
}
double tbegin = 0, ttotal = 0;
ttotal = 0;
// Loop for image acquisition and display
for (unsigned i = 0; i < nframes; i++) {
// Acquires an RGBa image
grabber->acquire(I);
if (opt_display) {
// Displays the grabbed rgba image
}
if (save) {
char buf[FILENAME_MAX];
sprintf(buf, opath.c_str(), i);
std::string filename(buf);
std::cout << "Write: " << filename << std::endl;
vpImageIo::write(I, filename);
}
double tend = vpTime::measureTimeMs();
double tloop = tend - tbegin;
tbegin = tend;
std::cout << "loop time: " << tloop << " ms" << std::endl;
ttotal += tloop;
}
std::cout << "Mean loop time: " << ttotal / nframes << " ms" << std::endl;
std::cout << "Mean frequency: " << 1000. / (ttotal / nframes) << " fps" << std::endl;
// Release the framegrabber
delete grabber;
return EXIT_SUCCESS;
} catch (const vpException &e) {
std::cout << "Catch an exception: " << e << std::endl;
return EXIT_FAILURE;
}
}
#else // (defined (VISP_HAVE_GTK) || defined(VISP_HAVE_GDI))
int main()
{
std::cout << "You do not have GDI (Graphical Device Interface), or GTK functionalities to display images..." << std::endl;
std::cout << "Tip if you are on a windows-like system:" << std::endl;
std::cout << "- Install GDI, configure again ViSP using cmake and build again this example" << std::endl;
return EXIT_SUCCESS;
}
#endif // (defined (VISP_HAVE_GTK) || defined(VISP_HAVE_GDI))
#else // defined (VISP_HAVE_DIRECTSHOW)
int main()
{
std::cout << "This example requires Direct Show SDK. " << std::endl;
std::cout << "Tip if you are on a windows-like system:" << std::endl;
std::cout << "- Install Direct Show, configure again ViSP using cmake and build again this example" << std::endl;
return EXIT_SUCCESS;
}
#endif // defined (VISP_HAVE_DIRECTSHOW)