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mainwindow.h：
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QMainWindow>
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#include <opencv2/core/mat.hpp>
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QT_BEGIN_NAMESPACE
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namespace Ui { class MainWindow; }
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QT_END_NAMESPACE
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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MainWindow(QWidget *parent = nullptr);
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~MainWindow();
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private slots:
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void on_playButton_clicked();
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void on_stopButton_clicked();
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void readFrame();
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private:
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Ui::MainWindow *ui;
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cv::VideoCapture mCapture; // Video capture object for reading RTSP stream
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cv::Mat mFrame; // Mat object to store the video frame
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bool mPlaying; // Flag to indicate if video playback is in progress
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};
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#endif // MAINWINDOW_H
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mainwindow.cpp：
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cpp
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#include "mainwindow.h"
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#include "ui_mainwindow.h"
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#include <QDebug>
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#include <QTimer>
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent)
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, ui(new Ui::MainWindow)
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{
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ui->setupUi(this);
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// Set up VideoCapture object for reading RTSP stream
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//调节参数 取决于对视频流带宽要求以及本机性能 适点即可
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mCapture.set(cv::CAP_PROP_BUFFERSIZE,5);
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mCapture.open("rtsp://localhost:8554/unicast"); //修改RTSP地址
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if (!mCapture.isOpened())
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{
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qCritical() << "Failed to open RTSP stream.";
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return;
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}
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//初始化mFrame和mPlaying标记
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mPlaying = false;
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//设置Paly按钮为不可用状态
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ui->playButton->setEnabled(true);
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ui->stopButton->setEnabled(false);
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}
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MainWindow::~MainWindow()
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{
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delete ui;
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}
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void MainWindow::on_playButton_clicked()
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{
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if (!mPlaying)
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{
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mPlaying = true;
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// 每20毫秒读取一帧并在QLabel显示该帧图像
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QTimer *timer = new QTimer(this);
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connect(timer, &QTimer::timeout, this, &MainWindow::readFrame);
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timer->start(20);
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//设置控件状态
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ui->playButton->setEnabled(false);
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ui->stopButton->setEnabled(true);
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}
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}
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void MainWindow::readFrame()
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{
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if (mCapture.read(mFrame))
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{
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QImage frameImage((uchar*)mFrame.data, mFrame.cols, mFrame.rows, QImage::Format_RGB888);
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QPixmap framePixmap = QPixmap::fromImage(frameImage.rgbSwapped());
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// .rgbSwapped()因为OpenCV默认使用BGR，而Qt使用RGB，必须交换颜色通道才能正确地显示
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ui->videoLabel->setPixmap(framePixmap.scaled(ui->videoLabel->size(), Qt::KeepAspectRatio));
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}
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}
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void MainWindow::on_stopButton_clicked()
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{
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if (mPlaying)
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{
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mPlaying = false;
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//停止计时器，断开信号/槽连接
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QObject::disconnect(this, &MainWindow::readFrame, nullptr, nullptr);
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//设置控件状态
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ui->playButton->setEnabled(true);
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ui->stopButton->setEnabled(false);
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//清除QLabel
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ui->videoLabel->clear();
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}
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} |
