1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
//! \example tutorial-video-reader.cpp
#include <visp3/core/vpConfig.h>
#include <visp3/gui/vpDisplayFactory.h>
//! [Include]
#include <visp3/core/vpTime.h>
#include <visp3/io/vpVideoReader.h>
//! [Include]
/*!
This example allows to read and display a video from a file.
It only requires that ViSP is build with OpenCV.
Example: ./tutorial-video-reader --name video.mp4
*/
int main(int argc, char **argv)
{
#if defined(VISP_HAVE_OPENCV) && \
(((VISP_HAVE_OPENCV_VERSION < 0x030000) && defined(HAVE_OPENCV_HIGHGUI)) || \
((VISP_HAVE_OPENCV_VERSION >= 0x030000) && defined(HAVE_OPENCV_VIDEOIO)))
#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif
try {
std::string videoname = "video.mp4";
for (int i = 1; i < argc; i++) {
if (std::string(argv[i]) == "--name" && i + 1 < argc) {
videoname = std::string(argv[++i]);
}
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 EXIT_SUCCESS;
}
}
vpImage<unsigned char> I;
//! [vpVideoReader construction]
vpVideoReader g;
//! [vpVideoReader construction]
//! [vpVideoReader setting]
g.setFileName(videoname);
//! [vpVideoReader setting]
//! [vpVideoReader open]
g.open(I);
//! [vpVideoReader open]
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_DISPLAY
vpDisplay *d = vpDisplayFactory::allocateDisplay(I);
#else
std::cout << "No image viewer is available..." << std::endl;
#endif
vpDisplay::setTitle(I, "Video reader");
unsigned cpt = 1;
bool quit = false;
//! [vpVideoReader while loop]
while ((!g.end()) && (!quit)) {
//! [vpVideoReader while loop]
//! [vpVideoReader loop start time]
double t = vpTime::measureTimeMs();
//! [vpVideoReader loop start time]
//! [vpVideoReader acquire]
g.acquire(I);
//! [vpVideoReader acquire]
vpDisplay::display(I);
vpDisplay::displayText(I, 20, 20, "Click to quit", vpColor::red);
std::stringstream ss;
ss << "Frame: " << ++cpt;
std::cout << "Read " << ss.str() << std::endl;
vpDisplay::displayText(I, 40, 20, ss.str(), vpColor::red);
vpDisplay::flush(I);
if (vpDisplay::getClick(I, false)) {
quit = true;
}
//! [vpVideoReader loop rate]
vpTime::wait(t, 1000. / g.getFramerate());
//! [vpVideoReader loop rate]
}
if (!quit) {
std::cout << "End of video was reached" << std::endl;
}
#ifdef VISP_HAVE_DISPLAY
delete d;
#endif
}
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
return EXIT_SUCCESS;
}
|
