QT5.9实现一个视频播放器播放暂停进度条-Toy模板网

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参考博主 1https://blog.csdn.net/liji_digital/article/details/83691035
参考博主2https://blog.csdn.net/qq_41071706/article/details/89855986

实现功能

通过选择按钮选择本地视频文件
点击播放按钮播放文本框中的文件（不支持其他类型文件的异常检测）支持mp4 avi等等如果不支持见参考博主2的内容
点击暂停按钮，暂停本视频播放，再次点击播放按钮，继续本视频的播放
进度条跟随视频进度移动
拖动进度条改变视频播放位置
视频必须播放之后才能拖动进度条改变播放进度
不支持快进慢放等操作

1.首先创建一个带ui的project

步骤省略

2.在ui文件中绘制如下模块

QT5.9实现一个视频播放器播放暂停进度条

实现代码如下

// mainwindow.h


#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWidget>
#include <QtMultimediaWidgets/QVideoWidget>
#include <QtMultimedia/QtMultimedia>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QVideoWidget    *       m_pPlayerWidget;
    QMediaPlayer    *       m_pPlayer;

public slots:
    void onSetMediaFile();
    void onStartPlayMedia();
    void onChangedPlayerPosition(qint64 pos);
};

#endif // MAINWINDOW_H

// mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtMultimediaWidgets/QVideoWidget>
#include <QtMultimedia/QtMultimedia>
#include <QFileDialog>
#include <QMessageBox>
#include <QException>
#include <QDebug>
#include "player-slider.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_pPlayer = new QMediaPlayer;
    m_pPlayerWidget = new QVideoWidget;

    QPalette qplte;
    qplte.setColor(QPalette::Window, QColor(0,0,0));
    m_pPlayerWidget->setPalette(qplte);

    m_pPlayer->setVideoOutput(m_pPlayerWidget);
    ui->verticalLayout->addWidget(m_pPlayerWidget);

    m_pPlayerWidget->setAutoFillBackground(true);
    QObject::connect(ui->pushButton_3,&QPushButton::clicked,this,&MainWindow::onSetMediaFile);
    QObject::connect(ui->pushButton,&QPushButton::clicked,this,&MainWindow::onStartPlayMedia);
    QObject::connect(ui->pushButton_2,&QPushButton::clicked,this->m_pPlayer,&QMediaPlayer::pause);

    QObject::connect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);

    QObject::connect(m_pPlayer, &QMediaPlayer::durationChanged, ui->horizontalSlider,&QPlayerSlider::setDurationPosition);
    QObject::connect(ui->horizontalSlider,&QPlayerSlider::sigProgress,this,&MainWindow::onChangedPlayerPosition);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::onSetMediaFile()
{
    QFileDialog dialog(this);
    dialog.setFileMode(QFileDialog::AnyFile);
    QStringList fileNames;
    if(dialog.exec())
    {
        fileNames = dialog.selectedFiles();
    }
    if(!fileNames.empty())
    {
        ui->lineEdit->setText(fileNames[0]);
    }
}

void MainWindow::onStartPlayMedia()
{
    qDebug()<<ui->lineEdit->text()<<"\n"<<m_pPlayer->currentMedia().canonicalUrl().path();
    QString filePath = ui->lineEdit->text();
    if(filePath != nullptr && filePath != ""){
        if(m_pPlayer->state() == QMediaPlayer::PausedState &&
           ui->lineEdit->text() == m_pPlayer->currentMedia().canonicalUrl().path().right(m_pPlayer->currentMedia().canonicalUrl().path().length()-1))
        {
            m_pPlayer->play();
        }
        else {
            m_pPlayer->setMedia(QUrl::fromLocalFile(filePath));
            m_pPlayer->play();
        }
    }
    else{
        QMessageBox::critical(this,"警告","请选择要播放的视频文件！");
    }
}

void MainWindow::onChangedPlayerPosition(qint64 pos)
{
    QObject::disconnect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);
    m_pPlayer->setPosition(pos);
    QObject::connect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);

}

// playerslider.h 需要将ui的slider提升为QPlayerSlider类

#ifndef PLAYERSLIDER_H
#define PLAYERSLIDER_H
#include <QSlider>

class QPlayerSlider :public QSlider{
    Q_OBJECT
public:
    QPlayerSlider(QWidget* parent = 0);
public slots:
    void setDurationPosition(qint64 max_len);
signals:
    void sigProgress(qint64 pos);
protected:
    void mouseReleaseEvent(QMouseEvent *e);
    void mousePressEvent(QMouseEvent *e);
    void mouseMoveEvent(QMouseEvent *e);
};


#endif // PLAYERSLIDER_H

// playerslider.cpp

#include "player-slider.h"
#include <QDebug>

QPlayerSlider::QPlayerSlider(QWidget * parent) : QSlider(parent)
{

}

void QPlayerSlider::setDurationPosition(qint64 max_len)
{
    setRange(0,max_len);
}

void QPlayerSlider::mouseReleaseEvent(QMouseEvent *e)
{
    qint64 pos = this->value();
    emit sigProgress(pos);
    QSlider::mouseReleaseEvent(e);
}


void QPlayerSlider::mousePressEvent(QMouseEvent *e)
{
    QSlider::mousePressEvent(e);
}

void QPlayerSlider::mouseMoveEvent(QMouseEvent *e)
{
    QSlider::mouseMoveEvent(e);
}