实验室项目需求,需要录制摄像头视频画面,海康大华自带的摄像头网页录制功能没有选取区域录制功能,并且录制文件保存不够便捷,文件太大,所以自己开发这个软件,并且用了opencv压缩视频,可选用调取ffmpeg命令行来进一步压缩录制到的视频。
实验室常用的摄像头有海康和大华两种,rtsp有所区别,所以把摄像头rtsp写入配置文件方便调用,
在.pro文件中引入opencv库,我用的是3.4.3版本
LIBS += \
D:\Softwares\ffmpeg4.1.3\lib\*.lib
INCLUDEPATH +=\
include\
D:/Softwares/opencv3.4.3GPU/build/include\
D:/Softwares/ffmpeg4.1.3/include
win32:CONFIG(release, debug|release):LIBS += \
D:/Softwares/opencv3.4.3/build/x64/vc14/lib/opencv_world343.lib
else:win32:CONFIG(debug, debug|release): LIBS += \
D:/Softwares/opencv3.4.3/build/x64/vc14/lib/opencv_world343d.lib
然后是调用摄像头代码片段
readvideo.h
public slots:
void setFlag(bool flag = false);
void openCamera();
private:
cv::VideoCapture capture;
cv::VideoWriter writer;
cv::Mat src_image;
void readvideo::openCamera()
{
QString sFilePath = QCoreApplication::applicationDirPath()+"/config.ini";
if(!QFileInfo::exists(sFilePath))
{
printf("FilePath is inexist!");
}
QSettings setting(sFilePath, QSettings::IniFormat);
setting.beginGroup("Hik");
QString iPrtsp = setting.value("rtsp").toString();
setting.endGroup();
capture.open(iPrtsp.toStdString().c_str());
if(!capture.isOpened())
{
return;
}
}
设计了五个button,分别对应五个功能,都是最关键的功能,在此不一一介绍,直接上代码
代码如下(示例):
MainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include"readvideo.h"
#include"mousechoose.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void receivePicture(QImage img);
void on_openCamera_clicked();
void on_startRecord_clicked();
void on_closeCamera_clicked();
void on_saveComplete_clicked();
void on_cut_clicked();
private:
Ui::MainWindow *ui;
MouseChoose *m_choose;
QThread *mainThread;
readvideo *videoThread;
QTimer fps_timer;
};
#endif // MAINWINDOW_H
MainWindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include
#include
#include
#include
#include "MyLabel.h"
#include
#include
using namespace cv;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_choose = new MouseChoose(this);
m_choose->setGeometry(0,0,1920,980);
mainThread = new QThread;
videoThread = new readvideo;
videoThread->moveToThread(mainThread);
connect(&fps_timer, SIGNAL(timeout()),videoThread,SLOT(mainwindowDisplay()));
connect(videoThread,SIGNAL(sendPicture(QImage)),this,SLOT(receivePicture(QImage)));
this->setWindowTitle(QStringLiteral("摄像头画面录制"));
fps_timer.setInterval(40);//每秒显示25帧
QString save_picture = QCoreApplication::applicationDirPath();
QDir dir;
dir.cd(save_picture);
if(!dir.exists("Video"))
{
dir.mkdir("Video");
}
}
MainWindow::~MainWindow()
{
mainThread->wait();
delete videoThread;
delete mainThread;
delete m_choose;
delete ui;
}
void MainWindow::receivePicture(QImage img)
{
ui->label1->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::on_openCamera_clicked()
{
mainThread->start();
fps_timer.start();
videoThread->openCamera();
}
void MainWindow::on_startRecord_clicked()
{
videoThread->setFlag(false);
videoThread->startRecord();
}
void MainWindow::on_closeCamera_clicked()
{
fps_timer.stop();
videoThread->closeCamera();
mainThread->quit();
mainThread->wait();
ui->label1->clear();
}
void MainWindow::on_saveComplete_clicked()
{
videoThread->setFlag(true);
videoThread->saveComplete();
}
void MainWindow::on_cut_clicked()
{
//选择文件打开保存
QProcess * p = new QProcess(this);
QString program = "D:/Softwares/ffmpeg4.1.3/bin/ffmpeg.exe";
QString fileName = QFileDialog::getOpenFileName(
this,
tr("select a file."),
".",
tr("video files(*.avi *.mp4 *.wmv)"));
QStringList argu;
argu.append("-i");
argu.append(fileName.toStdString().c_str());
argu.append("-s");
argu.append("1920x1080");
argu.append("-c:v");
argu.append("libx265");
argu.append("-c:a");
argu.append("aac");
argu.append("-b:v");
argu.append("200k");
argu.append("-r");
argu.append("25");
argu.append("D:/QtProjects/SaveVideo/debug/Video/outtest.mp4");
p->start(program,argu);
p->waitForFinished();
delete p;
}
根据QT带的鼠标事件来截取录制区域,如果不选择矩形框那么就是全屏录制
代码如下(示例):
MouseChoose.h
#ifndef MOUSECHOOSE_H
#define MOUSECHOOSE_H
#include
#include
#include
#include
#include
#include
class MouseChoose : public QLabel
{
Q_OBJECT
public:
explicit MouseChoose(QWidget *parent = nullptr);
//鼠标按下
void mousePressEvent(QMouseEvent *ev);
//鼠标释放
void mouseReleaseEvent(QMouseEvent *ev);
//鼠标移动
void mouseMoveEvent(QMouseEvent *ev);
//绘图操作
void paintEvent(QPaintEvent *event);
static int m_x,m_y,m_width,m_height;
private:
QRect roirect;
bool m_isMousePress;
QPainter m_painter;
QPoint m_beginPoint;
QPoint m_midPoint;
QPoint m_endPoint;
};
#endif // MOUSECHOOSE_H
MouseChoose.cpp
#include "mousechoose.h"
#include
#include
#include
#include
#include
MouseChoose::MouseChoose(QWidget *parent) : QLabel(parent)
{
}
//鼠标按下
void MouseChoose::mousePressEvent(QMouseEvent *ev)
{
//当鼠标左键按下 提示信息
if( ev->button() == Qt::LeftButton)
{
m_isMousePress = true;
//获取点坐标
m_beginPoint = ev->pos();
qDebug()<<"00"<<m_beginPoint;
//update();
}
}
//鼠标释放
void MouseChoose::mouseReleaseEvent(QMouseEvent *ev)
{
if(ev->button()==Qt::LeftButton)
{
m_endPoint = ev->pos();
m_isMousePress = false;
qDebug()<<"00"<<m_endPoint;
update();
}
}
//鼠标移动,更新矩形框
void MouseChoose::mouseMoveEvent(QMouseEvent *ev)
{
if( ev->buttons() & Qt::LeftButton )
{
m_midPoint=ev->pos();
update();
}
}
//静态成员变量在类外分配内存空间
int MouseChoose::m_x = 0;
int MouseChoose::m_y = 0;
int MouseChoose::m_width = 0;
int MouseChoose::m_height = 0;
//画矩形框
void MouseChoose::paintEvent(QPaintEvent *ev)
{
QLabel::paintEvent(ev);//先调用父类的paintEvent
QPainter m_painter(this);
m_painter.setPen(QPen(Qt::red,2));
if (m_isMousePress)
{
roirect = QRect(m_beginPoint,m_midPoint);
m_painter.drawRect(roirect);
MouseChoose::m_x = m_beginPoint.x();
MouseChoose::m_y = m_beginPoint.y();
MouseChoose::m_width = abs(m_midPoint.x() - m_beginPoint.x());
MouseChoose::m_height =abs(m_midPoint.y() - m_beginPoint.y());
}
else
{
roirect = QRect(m_beginPoint,m_endPoint);
m_painter.drawRect(roirect);
MouseChoose::m_x = m_beginPoint.x();
MouseChoose::m_y = m_beginPoint.y();
MouseChoose::m_width = abs(m_endPoint.x() - m_beginPoint.x());
MouseChoose::m_height = abs(m_endPoint.y() - m_beginPoint.y());
}
}
这部分已经放在Button下了,可以参考,具体实现可以去其他博主参考格式
现附上readvideo剩余代码
ReadVideo.h
#ifndef READVIDEO_H
#define READVIDEO_H
#include
#include
#include
#include
#include
#include
#include
#include "mousechoose.h"
#include
class readvideo : public QObject
{
Q_OBJECT
public:
explicit readvideo(QObject *parent = 0);
~readvideo();
signals:
void sendPicture(const QImage &img);
public slots:
void setFlag(bool flag = false);
void openCamera();
void startRecord();
void closeCamera();
void saveComplete();
void mainwindowDisplay();
private:
MouseChoose *m_choose;
cv::VideoCapture capture;
cv::VideoWriter writer;
cv::Mat src_image;
QMutex m_Mutex;
bool stopFlag=false;
bool m_bUpdateMat;
};
#endif // READVIDEO_H
ReadVideo.cpp
#include "readvideo.h"
#include
#include
#include
#include
#include
#include
#include
#include
#include
readvideo::readvideo(QObject *parent):
QObject(parent)
{
stopFlag = false;
m_choose = new MouseChoose;
m_bUpdateMat =false;
}
readvideo::~readvideo()
{
delete m_choose;
}
void readvideo::openCamera()
{
QString sFilePath = QCoreApplication::applicationDirPath()+"/config.ini";
if(!QFileInfo::exists(sFilePath))
{
printf("FilePath is inexist!");
}
QSettings setting(sFilePath, QSettings::IniFormat);
setting.beginGroup("Hik");
QString iPrtsp = setting.value("rtsp").toString();
setting.endGroup();
capture.open(iPrtsp.toStdString().c_str());
if(!capture.isOpened())
{
return;
}
}
void readvideo::startRecord()
{
QString fileName = QFileDialog::getSaveFileName(nullptr,"保存文件",".",tr("*.mp4"));
cv::String file_path = fileName.toStdString();
int fps = capture.get(CV_CAP_PROP_FPS);
if(MouseChoose::m_height == 0)
{
writer.open(file_path,CV_FOURCC('D', 'I', 'V', 'X'), fps, cv::Size(capture.get(CV_CAP_PROP_FRAME_WIDTH),capture.get(CV_CAP_PROP_FRAME_HEIGHT)));
}
else
{
writer.open(file_path,CV_FOURCC('D', 'I', 'V', 'X'), fps, cv::Size(MouseChoose::m_width,MouseChoose::m_height));
}
while(!stopFlag)
{
//capture >> src_image;
if(m_bUpdateMat)
{
cv::Rect rect;
rect.width = MouseChoose::m_width;
rect.height = MouseChoose::m_height;
rect.x = MouseChoose::m_x;
rect.y = MouseChoose::m_y;
if(MouseChoose::m_height == 0)
{
// cv::imshow("录制画面",src_image);
writer.write(src_image);
m_bUpdateMat = false;
}
else
{
cv::Mat roimage = src_image(rect).clone();
// cv::imshow("录制画面", roimage);
writer.write(roimage);
m_bUpdateMat = false;
}
}
cv::waitKey(1);
}
writer.release();
}
void readvideo::mainwindowDisplay()
{
//40ms更新一次,如果不加m_bUpdateMat判断,程序这需要10ms,开始录制需要10ms,那么3帧录得都是同一画面
// m_Mutex.lock();
capture >> src_image;
QImage img = QImage((const unsigned char*)src_image.data,
src_image.cols, src_image.rows, QImage::Format_RGB888).rgbSwapped(); //RGB格式转换成BGR格式
m_bUpdateMat = true;
// m_Mutex.unlock();
emit sendPicture(img);
}
void readvideo::closeCamera()
{
if(!stopFlag) //如果还在保存视频,则关闭cv窗口
{
cv::destroyWindow("video");
}
capture.release();
writer.release();
}
void readvideo::setFlag(bool flag)
{
stopFlag = flag;
}
void readvideo::saveComplete()
{
cv::destroyWindow("video");
}
该处使用的url网络请求的数据。
主线程和调用摄像头线程,我用的是 QT更推荐的moveToThread——用moveToThread将继承于QObject的类转移到Thread里这种方式,具体实现代码中很清晰,这里附上我的参考博客链接。
记录自己C++代码不断进步的过程,一起加油,看到这的给我点个赞吧,谢谢!
VS+QT多线程实现——run和moveToThread 博主:Jack1009HF
https://blog.csdn.net/yrg1009/article/details/108546119