win32:CONFIG(release, debug|release): LIBS += -LD:/opencv/build/x64/vc15/lib/ -lopencv_world455
else:win32:CONFIG(debug, debug|release): LIBS += -LD:/opencv/build/x64/vc15/lib/ -lopencv_world455d

INCLUDEPATH += D:/opencv/build/include
DEPENDPATH += D:/opencv/build/include

#include "newqslider.h"
newqslider::newqslider(QWidget *parent) : QSlider(parent)
{
}
/*****************************************************************
* 函數(shù)名稱：mousePressEvent(QMouseEvent *ev)
* 功能描述：重寫鼠標點擊事件，實現(xiàn)進度條點擊哪跳到哪
* 參數(shù)說明： 無
* 返回值：   無
******************************************************************/
void newqslider::mousePressEvent(QMouseEvent *ev)
{
    //先調(diào)用父類的鼠標點擊處理事件，這樣可以不影響拖動的情況
    QSlider::mousePressEvent(ev);
    //獲取鼠標的位置，這里并不能直接從ev中取值（因為如果是拖動的話，鼠標開始點擊的位置沒有意義了）
    double pos = ev->pos().x() / (double)width();
    setValue(pos * (maximum() - minimum()) + minimum());
    //發(fā)送自定義的鼠標單擊信號
    emit costomSliderClicked();
}

#include <QObject>
#include <QThread>
#include <opencv2/opencv.hpp>
#include <iostream>
#include <QDebug>
#include <QDateTime>
using namespace  std;
using namespace  cv;
class videothread : public QThread
{
    Q_OBJECT
public:
    videothread(const char* filename);
    void run();
    //釋放視頻采集對象
    void releaseCap();
    //獲取視頻總幀數(shù)
    int getVideoAllFramecount();
    //設(shè)置當前進度條
    void setCurrentFrame(int value);
    bool getStop() const;
    //設(shè)置視頻結(jié)束標識
    void setStop(bool value);
    bool getIsrun() const;
    void setIsrun(bool value);
    //暫停
    void pauseThread();
    //繼續(xù)
    void resumeThread();
    //停止
    void stopThread();
signals:
    //發(fā)送當前幀和 幀數(shù)
    void sendFrame(int currentFrame,Mat frame);
private:
    //視頻對象
    VideoCapture cap;
    Mat frame;
    //視頻當前幀數(shù)
    int currentFramecount;
    //總幀數(shù)
    int allFramecount;
    //視頻幀率
    int fps;
    //錄制視頻幀
    int videoWriterFrame;
    //線程結(jié)束標識位
    bool stop;
    //視頻暫停標識位
    bool isrun;
};

#include "videothread.h"
videothread::videothread(const char* filename)
{
    this->stop = false;
    this->isrun =false;
    this->currentFramecount=0;
    this->videoWriterFrame=0;
    if(cap.open(filename));//創(chuàng)建視頻對象
    {
        this->allFramecount=cap.get(CAP_PROP_FRAME_COUNT);//獲取視頻文件中的總幀數(shù)
        this->fps=int(round(cap.get(CAP_PROP_FPS)));//獲取視頻幀率
    }
}
void videothread::run()
{
    while(stop==false)//線程運行和停止  卡住線程 暫停時不退出線程
    {
        while(isrun==true)//視頻運行和暫停
        {
            if(cap.read(frame))//捕獲視頻幀
            {
                this->currentFramecount++;
                cvtColor(frame, frame, COLOR_BGR2RGB);//opencvBGR格式轉(zhuǎn)成Image用到的RGB
                emit sendFrame(currentFramecount,frame);//發(fā)送幀數(shù)據(jù)
            }
            msleep(40);//延時
        }
    }
    cap.release();//釋放打開的視頻
}
int videothread::getVideoAllFramecount()
{
    return allFramecount;
}
void videothread::setStop(bool value)
{
    stop = value;
}
void videothread::setCurrentFrame(int value)
{
    this->currentFramecount=value;//當前幀數(shù)
    cap.set(CAP_PROP_POS_FRAMES,currentFramecount);//進度條跳轉(zhuǎn)對應(yīng)幀
}
bool videothread::getIsrun() const
{
    return isrun;
}
void videothread::setIsrun(bool value)
{
    isrun = value;
}
void videothread::pauseThread()//這兩個函數(shù)用于確保是在運行情況下才能切換狀態(tài)
{
    if(this->isRunning()&&this->isrun==true)//當前線程運行且視頻運行
    {
        this->isrun=false;
    }
}
void videothread::resumeThread()
{
    if(this->isRunning()&&this->isrun==false)//當前線程運行且視頻暫停
    {
        this->isrun=true;
    }
}
void videothread::stopThread()
{
    if(this->isRunning())//當前線程運行
    {
        this->stop=true;//結(jié)束線程
        //msleep(10);
        releaseCap();
        this->terminate();
    }
}
bool videothread::getStop() const
{
    return stop;
}
void videothread::releaseCap()
{
    if(cap.isOpened()){
        cap.release();
    }
}