#include "stdafx.h"

#include <iostream>

#include <opencv2/core/core.hpp>

#include <opencv2/highgui/highgui.hpp>

#include "cv.h"

using namespace cv;

using namespace std;

int g_slider_position = 0, temp;

CvCapture *g_captrue = NULL;

void onTrackbarSlide(int pos)

{

    cvSetCaptureProperty(g_captrue, CV_CAP_PROP_POS_FRAMES,

    pos);

    temp = g_slider_position;

}

int main(int argc, char **argv)

{

    cvNamedWindow("sample-out", CV_WINDOW_AUTOSIZE);

    //创建输出处理后视频的窗口

    cvNamedWindow("sample", CV_WINDOW_AUTOSIZE);

    //创建初始视频窗口

    g_captrue = cvCreateFileCapture("sample.avi");

    //Cvcapture结构体赋值

    int frames = (int)cvGetCaptureProperty(g_captrue,

    CV_CAP_PROP_FRAME_COUNT);

    //获取视频总帧数

    if (frames != 0)///若视频存在即帧数不为0则创建滚动条

    {

        cvCreateTrackbar("Position", "sample",

        &g_slider_position, frames, onTrackbarSlide);

    }

    IplImage *frame;//创建图像指针

    while (1)

    {

        frame = cvQueryFrame(g_captrue);//读取一帧

        if (!frame)//读完退出

            break;

        cvShowImage("sample", frame);//显示在sample窗口中

        IplImage* out = cvCreateImage(cvGetSize(frame),

        IPL_DEPTH_8U, 3);

        //创建视频地址并为其开辟空间。

        cvSmooth(frame, out, CV_GAUSSIAN, 3, 3);//对每一帧高斯模糊

        cvShowImage("sample-out", out);//视频输出到sample-out窗口中

        char c = cvWaitKey(30);//每一帧间隔30ms

        cvSetTrackbarPos("Position", "sample", temp++);//滚动条随动

        if (c == 27)

            break;

    }

    cvReleaseCapture(&g_captrue);//释放指针

    cvDestroyWindow("sample");//删除sample初始视频窗口

    cvDestroyWindow("sample-out");//删除sample-out处理后的视频窗口

    return 0;

}