opencv做的简单播放器

  1 #include <opencv2/highgui/highgui.hpp>
  2 #include <opencv2/imgproc/imgproc.hpp>
  3 #include <string>
  4 #include <iostream>
  5 #include <fstream>
  6 
  7 using namespace std;
  8 
  9 int g_slider_position = 0;
 10 int g_run = 1, g_dontset = 0;
 11 cv::VideoCapture g_cap;
 12 void onTrackbarSlide(int pos, void*) {
 13 	g_cap.set(cv::CAP_PROP_POS_FRAMES, pos);
 14 
 15 	if (!g_dontset)
 16 		g_run = 1;
 17 	g_dontset = 0;
 18 }
 19 int main(int argc, char** argv) {
 20 	std::string s = "Video/2020-06/e0927594e320877035894dc0a435f1b6.mp4";
 21 
 22 	g_cap.open(s);//视频读取结构，通过传入字符串
 23 
 24 	int frames = (int)g_cap.get(cv::CAP_PROP_FRAME_COUNT);
 25 	int tmpw = (int)g_cap.get(cv::CAP_PROP_FRAME_WIDTH);
 26 	int tmph = (int)g_cap.get(cv::CAP_PROP_FRAME_HEIGHT);
 27 
 28 	cout << "Video has" << frames << "frames of dimensions(" << tmpw << "," << tmph << ")." << endl;
 29 
 30 	cv::createTrackbar("Position", "Example2_4", &g_slider_position, frames, onTrackbarSlide);
 31 
 32 	cv::Mat frame;
 33 	for (;;) {
 34 		if (g_run != 0) {
 35 			g_cap >> frame; if (frame.empty())break;
 36 			int current_pos = (int)g_cap.get(cv::CAP_PROP_POS_FRAMES);
 37 			g_dontset = 1;
 38 
 39 			cv::setTrackbarPos("Position", "Example2_4", current_pos);
 40 			cv::imshow("Example2_4", frame);
 41 
 42 			g_run -= 1;
 43 		}
 44 
 45 		char c = (char)cv::waitKey(10);
 46 		if (c == 's') {
 47 			g_run = 1;  cout << "Singal step, run = " << g_run << endl;
 48 		}
 49 		if (c == 'r') {
 50 			g_run = -1; cout << "Run mode, run = " << g_run << endl;
 51 		}
 52 		if (c == 27)
 53 			break;
 54 
 55 	}
 56 	cv::destroyWindow("Example2_4");
 57 	return 0;
 58 }