基于Qt实现视频播放器功能基于Qt实现视频播放器功能

一、功能介绍
二、代码
三、运行

一、功能介绍

文章图片

能实现视频播放

二、代码 mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include #include #include #include #include #include #include #include #include #include #include /* 媒体信息结构体 */struct MediaObjectInfo {QString fileName; // 用于保存视频文件名QString filePath; // 用于保存视频文件路径}; class MainWindow : public QMainWindow{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr); ~MainWindow(); /* 属性 */private:QMediaPlayer *videoPlayer; // 媒体播放器，用于播放视频QMediaPlaylist *mediaPlaylist; // 媒体列表QVideoWidget *videoWidget; // 视频显示窗口QListWidget *videoListWidget; // 视频列表QSlider *playProgressScrollBar; // 播放进度条QSlider *volumeScrollBar; // 音量条QPushButton *pushButton[5]; // 视频播放器按钮QHBoxLayout *hBoxLayout[3]; // 水平布局QWidget *hWidget[3]; // 水平容器QLabel *label[2]; // 标签文本QWidget *vWidget[2]; // 垂直容器QVBoxLayout *vBoxLayout[2]; // 垂直布局/* 函数 */public:void initWidget(); // 初始化窗口void mediaPlayerInit(); // 媒体播放初始化void scanVideoFiles(); // 扫描本地视频文件/* 槽函数 */public slots:void SltBtnPlayClicked(); // 播放点击void SltBtnNextClicked(); // 下一首点击void SltBtnVolumeDownClicked(); // 声音加点击void SltBtnVolumeUpClicked(); // 声音减点击void SltBtnFullScreenClicked(); // 全屏点击void SltVideoListWidgetCliked(QListWidgetItem*); // 视频列表点击void SltMediaPlaylistCurrentIndexChanged(int); // 媒体当前项改变void SltMediaPlayerStateChanged(QMediaPlayer::State); // 媒体播放状态改变void SltMediaPlayerDurationChanged(qint64); // 媒体时长发生变化void SltMediaPlayerPositionChanged(qint64); // 媒体当前播放时间发生变化void SltPlayProgressScrollBarReleased(); // 播放进度条void SltVolumeScrollBarReleased(); // 音量进度条void resizeEvent(QResizeEvent *event); }; #endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include #include QString videoFilePath = "/home/luatao/qt/videoplayer/myVideo"; MainWindow::MainWindow(QWidget *parent): QMainWindow(parent){initWidget(); // 初始化窗口mediaPlayerInit(); // 媒体播放初始化scanVideoFiles(); // 扫描本地视频/* 按钮连接信号槽 */connect(pushButton[0], SIGNAL(clicked()), this, SLOT(SltBtnPlayClicked())); // 播放connect(pushButton[1], SIGNAL(clicked()),this, SLOT(SltBtnNextClicked())); // 下一首connect(pushButton[2], SIGNAL(clicked()), this, SLOT(SltBtnVolumeDownClicked())); // 声音减connect(pushButton[3], SIGNAL(clicked()), this, SLOT(SltBtnVolumeUpClicked())); // 声音加connect(pushButton[4], SIGNAL(clicked()),this, SLOT(SltBtnFullScreenClicked())); // 全屏/* 列表连接信号槽 */connect(videoListWidget, SIGNAL(itemClicked(QListWidgetItem*)),this, SLOT(SltVideoListWidgetCliked(QListWidgetItem*))); /* 媒体连接信号槽 */connect(mediaPlaylist,SIGNAL(currentIndexChanged(int)),this,SLOT(SltMediaPlaylistCurrentIndexChanged(int))); connect(videoPlayer,SIGNAL(stateChanged(QMediaPlayer::State)),this,SLOT(SltMediaPlayerStateChanged(QMediaPlayer::State))); connect(videoPlayer, SIGNAL(durationChanged(qint64)),this,SLOT(SltMediaPlayerDurationChanged(qint64))); connect(videoPlayer,SIGNAL(positionChanged(qint64)), this,SLOT(SltMediaPlayerPositionChanged(qint64))); /* 滚动条连接*/connect(playProgressScrollBar, SIGNAL(sliderReleased()), this, SLOT(SltPlayProgressScrollBarReleased())); connect(volumeScrollBar, SIGNAL(sliderReleased()),this, SLOT(SltVolumeScrollBarReleased())); }MainWindow::~MainWindow(){}/** * @brief Widget::initWidget * 初始化窗口 */void MainWindow::initWidget(){this->setGeometry(0, 0, 800, 480); QPalette pal; pal.setColor(QPalette::WindowText, Qt::white); // 设置窗口文字为白色/* 构造对象 */for (int i = 0; i < 3; i++) {/* 水平容器 */hWidget[i] = new QWidget(); hWidget[i]->setAutoFillBackground(true); /* 水平布局 */hBoxLayout[i] = new QHBoxLayout(); }for (int i = 0; i < 2; i++) {/* 垂直容器 */vWidget[i] = new QWidget(); vWidget[i]->setAutoFillBackground(true); /* 垂直布局 */vBoxLayout[i] = new QVBoxLayout(); }/* 标签 */for (int i = 0; i < 2; i++) {label[i] = new QLabel(); }/* 按键 */for (int i = 0; i < 5; i++) {pushButton[i] = new QPushButton(); pushButton[i]->setMaximumSize(44, 44); pushButton[i]->setMinimumSize(44, 44); }/* 设置按钮的属性 */pushButton[0]->setCheckable(true); // 播放pushButton[4]->setCheckable(true); // 全屏/* 设置样式名*/vWidget[0]->setObjectName("vWidget0"); vWidget[1]->setObjectName("vWidget1"); hWidget[1]->setObjectName("hWidget1"); hWidget[2]->setObjectName("hWidget2"); pushButton[0]->setObjectName("btn_play"); pushButton[1]->setObjectName("btn_next"); pushButton[2]->setObjectName("btn_volumedown"); pushButton[3]->setObjectName("btn_volumeup"); pushButton[4]->setObjectName("btn_screen"); QFont font; font.setPixelSize(18); // 字体大小label[0]->setFont(font); label[1]->setFont(font); pal.setColor(QPalette::WindowText, Qt::white); label[0]->setPalette(pal); label[1]->setPalette(pal); label[0]->setText("00:00"); // 播放时间显示label[1]->setText("/00:00"); /* 播放进度条 */playProgressScrollBar = new QSlider(Qt::Horizontal); // 水平方向playProgressScrollBar->setMaximumHeight(15); playProgressScrollBar->setObjectName("durationSlider"); /* 声音滚动条 */volumeScrollBar = new QSlider(Qt::Horizontal); volumeScrollBar->setRange(0, 100); volumeScrollBar->setMaximumWidth(80); volumeScrollBar->setObjectName("volumeSlider"); volumeScrollBar->setValue(50); // 中间值/* 视频列表 */videoListWidget = new QListWidget(); videoListWidget->setObjectName("listWidget"); videoListWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); // 隐藏垂直滚动条videoListWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); // 隐藏水平滚动条/* 视频窗口 */videoWidget = new QVideoWidget(); videoWidget->setStyleSheet("border-image: none; " "background: transparent; ""border:none"); videoWidget->setMinimumSize(500, 480); // 视频窗口大小/* 下面是界面布局 *//* H0 布局 */vWidget[0]->setMinimumSize(300, 480); vWidget[0]->setMaximumWidth(300); hBoxLayout[0]->addWidget(videoWidget); // 视频窗口左边hBoxLayout[0]->addWidget(vWidget[0]); // 右边垂直窗口hWidget[0]->setLayout(hBoxLayout[0]); hBoxLayout[0]->setContentsMargins(0, 0, 0, 0); setCentralWidget(hWidget[0]); // 只有Qmainwindow才能创建中心布局Qwidget不行/* V0 布局 */QSpacerItem *vSpacer0 = new QSpacerItem(0, 80,QSizePolicy::Minimum,QSizePolicy::Maximum); vBoxLayout[0]->addWidget(videoListWidget); // 添加视频列表vBoxLayout[0]->addSpacerItem(vSpacer0); vBoxLayout[0]->setContentsMargins(0, 0, 0, 0); vWidget[0]->setLayout(vBoxLayout[0]); /* V1 布局 *//* 底板部件布局 */hWidget[1]->setMaximumHeight(15); hWidget[2]->setMinimumHeight(65); vBoxLayout[1]->addWidget(hWidget[1]); vBoxLayout[1]->addWidget(hWidget[2]); vBoxLayout[1]->setAlignment(Qt::AlignCenter); vWidget[1]->setLayout(vBoxLayout[1]); vWidget[1]->setParent(this); vWidget[1]->setGeometry(0, this->height() - 80, this->width(), 80); vBoxLayout[1]->setContentsMargins(0, 0, 0, 0); /* 位于最上层 */vWidget[1]->raise(); /* H1 布局 */hBoxLayout[1]->addWidget(playProgressScrollBar); // 播放进度条hBoxLayout[1]->setContentsMargins(0, 0, 0, 0); hWidget[1]->setLayout(hBoxLayout[1]); /* H2 布局 */QSpacerItem *hSpacer0 = new QSpacerItem(300, 80,QSizePolicy::Expanding,QSizePolicy::Maximum); hBoxLayout[2]->addSpacing(20); hBoxLayout[2]->addWidget(pushButton[0]); hBoxLayout[2]->addSpacing(10); hBoxLayout[2]->addWidget(pushButton[1]); hBoxLayout[2]->addSpacing(10); hBoxLayout[2]->addWidget(pushButton[2]); hBoxLayout[2]->addWidget(volumeScrollBar); hBoxLayout[2]->addWidget(pushButton[3]); hBoxLayout[2]->addWidget(label[0]); hBoxLayout[2]->addWidget(label[1]); hBoxLayout[2]->addSpacerItem(hSpacer0); hBoxLayout[2]->addWidget(pushButton[4]); hBoxLayout[2]->addSpacing(20); hBoxLayout[2]->setContentsMargins(0, 0, 0, 0); hBoxLayout[2]->setAlignment(Qt::AlignLeft | Qt::AlignTop); hWidget[2]->setLayout(hBoxLayout[2]); }/** * @brief MainWindow::mediaPlayerInit * 媒体初始化 */void MainWindow::mediaPlayerInit(){videoPlayer = new QMediaPlayer(this); mediaPlaylist = new QMediaPlaylist(this); // 播放列表mediaPlaylist->clear(); videoPlayer->setPlaylist(mediaPlaylist); videoPlayer->setVideoOutput(videoWidget); // 设置视频输出窗口mediaPlaylist->setPlaybackMode(QMediaPlaylist::Loop); // 设置播放模式，Loop 是列循环videoPlayer->setVolume(50); // 设置默认软件音量为 50%}/** * @brief MainWindow::scanVideoFiles * 扫描视频文件 */void MainWindow::scanVideoFiles(){//QDir dir(QCoreApplication::applicationDirPath()+ "/myVideo"); QDir dir(videoFilePath); // 视频文件路径QDir dirbsolutePath(dir.absolutePath()); // 绝对路径//qDebug() << dirbsolutePath << endl; if (dirbsolutePath.exists()) { // 如果目录存在QStringList filter; // 定义过滤器/* 包含所有 xx 后缀的文件 */filter << "*.mp4" << "*.mkv" << "*.wmv" << "*.avi"; /* 获取该目录下的所有文件 */QFileInfoList files = dirbsolutePath.entryInfoList(filter, QDir::Files); for (int i = 0; i < files.count(); i++) {MediaObjectInfo info; /* 使用 utf-8 编码 */info.fileName = QString::fromUtf8(files.at(i).fileName().toUtf8().data()); info.filePath = QString::fromUtf8(files.at(i).filePath().toUtf8().data()); /* 媒体列表添加视频 */if (mediaPlaylist->addMedia(QUrl::fromLocalFile(info.filePath))) {/* 添加到容器数组里储存 *///mediaObjectInfo.append(info); /* 添加视频名字至列表 */videoListWidget->addItem(info.fileName); } else {qDebug()<errorString().toUtf8().data()<< endl; qDebug()<< " Error number:"<< mediaPlaylist->error()<< endl; }}}else{qDebug()<< "目录不存在 "<< endl; }}/** * @brief MainWindow::SltBtnPlayClicked * 播放点击 */void MainWindow::SltBtnPlayClicked(){int state = videoPlayer->state(); // 获取播放的状态switch (state) {case QMediaPlayer::StoppedState:/* 媒体播放 */videoPlayer->play(); break; case QMediaPlayer::PlayingState:/* 媒体暂停 */videoPlayer->pause(); break; case QMediaPlayer::PausedState:videoPlayer->play(); break; }}/** * @brief MainWindow::SltBtnNextClicked * 下一首点击 */void MainWindow::SltBtnNextClicked(){videoPlayer->stop(); // 停止播放int count = mediaPlaylist->mediaCount(); // 获取播放列表的视频个数if (0 == count)return; /* 列表下一个 */mediaPlaylist->next(); videoPlayer->play(); }/** * @brief MainWindow::SltBtnVolumeDownClicked * 声音减点击 */void MainWindow::SltBtnVolumeDownClicked(){/* 点击每次音量-5 */volumeScrollBar->setValue(volumeScrollBar->value() - 5); videoPlayer->setVolume(volumeScrollBar->value()); }/** * @brief MainWindow::SltBtnVolumeUpClicked * 声音加点击 */void MainWindow::SltBtnVolumeUpClicked(){/* 点击每次音量+5 */volumeScrollBar->setValue(volumeScrollBar->value() + 5); videoPlayer->setVolume(volumeScrollBar->value()); }/** * @brief MainWindow::SltBtnFullScreenClicked * 全屏点击 */void MainWindow::SltBtnFullScreenClicked(){/* 全屏/非全屏操作 */vWidget[0]->setVisible(!pushButton[4]->isChecked()); }/** * @brief MainWindow::SltVideoListWidgetCliked * 视频列表点击 * @param item */void MainWindow::SltVideoListWidgetCliked(QListWidgetItem *item){videoPlayer->stop(); mediaPlaylist->setCurrentIndex(videoListWidget->row(item)); // 选中点击的项videoPlayer->play(); }/** * @brief MainWindow::SltMediaPlaylistCurrentIndexChanged * 媒体当前项发生改变选中播放列表 * @param index */void MainWindow::SltMediaPlaylistCurrentIndexChanged(int index){if (-1 == index)return; /* 设置列表正在播放的项 */videoListWidget->setCurrentRow(index); }/** * @brief MainWindow::SltMediaPlayerStateChanged * 媒体播放状态发生改变 * @param state */void MainWindow::SltMediaPlayerStateChanged(QMediaPlayer::State state){switch (state) {case QMediaPlayer::StoppedState:pushButton[0]->setChecked(false); break; case QMediaPlayer::PlayingState:pushButton[0]->setChecked(true); break; case QMediaPlayer::PausedState:pushButton[0]->setChecked(false); break; }}/** * @brief MainWindow::SltMediaPlayerDurationChanged * 媒体播放时长发生变化 * @param duration */void MainWindow::SltMediaPlayerDurationChanged(qint64 duration){playProgressScrollBar->setRange(0, duration / 1000); // 设置播放进度条的范围int second = duration / 1000; int minute = second / 60; second %= 60; QString mediaDuration; mediaDuration.clear(); if (minute >= 10)mediaDuration = QString::number(minute, 10); elsemediaDuration = "0" + QString::number(minute, 10); if (second >= 10)mediaDuration = mediaDuration + ":" + QString::number(second, 10); elsemediaDuration = mediaDuration + ":0" + QString::number(second, 10); /* 显示媒体总长度时间 */label[1]->setText("/" + mediaDuration); }/** * @brief MainWindow::SltMediaPlayerPositionChanged * 媒体当前播放时间发生变化 * @param position */void MainWindow::SltMediaPlayerPositionChanged(qint64 position){if (!playProgressScrollBar->isSliderDown()) // 进度条没有按下playProgressScrollBar->setValue(position / 1000); int second = position / 1000; int minute = second / 60; second %= 60; QString mediaPosition; mediaPosition.clear(); if (minute >= 10)mediaPosition = QString::number(minute, 10); elsemediaPosition = "0" + QString::number(minute, 10); if (second >= 10)mediaPosition = mediaPosition + ":" + QString::number(second, 10); elsemediaPosition = mediaPosition + ":0" + QString::number(second, 10); /* 显示现在播放的时间 */label[0]->setText(mediaPosition); }/** * @brief MainWindow::SltPlayProgressScrollBarReleased * 播放进度条释放 */void MainWindow::SltPlayProgressScrollBarReleased(){/* 设置媒体播放的位置 */videoPlayer->setPosition(playProgressScrollBar->value() * 1000); }/** * @brief MainWindow::SltVolumeScrollBarReleased * 音量进度条释放 */void MainWindow::SltVolumeScrollBarReleased(){/* 设置音量 */videoPlayer->setVolume(volumeScrollBar->value()); }/** * @brief MainWindow::resizeEvent * 重绘窗口 * @param event */void MainWindow::resizeEvent(QResizeEvent *event){Q_UNUSED(event); vWidget[1]->setGeometry(0, this->height() - 80, this->width(), 80); }

main.cpp

#include "mainwindow.h"#include #include int main(int argc, char *argv[]){QApplication a(argc, argv); /* 指定文件 */QFile file(":/style.qss"); /* 判断文件是否存在 */if (file.exists() ) {/* 以只读的方式打开 */file.open(QFile::ReadOnly); /* 以字符串的方式保存读出的结果 */QString styleSheet = QLatin1String(file.readAll()); /* 设置全局样式 */qApp->setStyleSheet(styleSheet); /* 关闭文件 */file.close(); }MainWindow w; w.show(); return a.exec(); }

style.qss

QWidget {border-image:url(:/images/bg.png); }QLabel {border-image:none; }QWidget#hWidget1 {border-image:none; background:transparent; }QWidget#hWidget2 {border-image:none; background:transparent; }QWidget#vWidget1 {border-image:url(:/images/mask.png); background:#24252a; }QWidget#vWidget0 {border-image:none; }QListWidget#listWidget {color:white; font-size: 15px; border:none; background: "#20ffffff"; border-image:none; }QListWidgetlistWidget:item:active {background: transparent; }QListWidget#listWidget:item {background: transparent; height:60; }QListWidget#listWidget:item:selected {color:#5edcf3; background: transparent; }QListWidget#listWidget:item:hover {background: transparent; color:#5edcf3; border:none; }QPushButton#btn_play {border-image:url(:/icons/btn_play1.png); }QPushButton#btn_play:hover {border-image:url(:/icons/btn_play2.png); }QPushButton#btn_play:checked {border-image:url(:/icons/btn_pause1.png); }QPushButton#btn_play:checked:hover {border-image:url(:/icons/btn_pause2.png); }QPushButton#btn_next {border-image:url(:/icons/btn_next1.png); }QPushButton#btn_next:hover {border-image:url(:/icons/btn_next2.png); }QPushButton#btn_volumedown {border-image:url(:/icons/btn_volumedown1.png); }QPushButton#btn_volumedown:hover {border-image:url(:/icons/btn_volumedown2.png); }QPushButton#btn_volumeup {border-image:url(:/icons/btn_volumeup1.png); }QPushButton#btn_volumeup:hover {border-image:url(:/icons/btn_volumeup2.png); }QSlider#durationSlider:handle:horizontal {border-image:url(:/icons/handle.png); }QSlider#durationSlider {border-image:none; }QSlider#durationSlider:add-page:horizontal {border-image:url(:/images/add_page.png); }QSlider#volumeSlider {border-image:none; }QSlider#volumeSlider:handle:horizontal {border-image:url(:/icons/handle.png); }QSlider#volumeSlider:handle:horizontal {background:transparent; }QSlider#volumeSlider:add-page:horizontal {border-image:url(:/images/add_page.png); }QPushButton#btn_screen {border-image:url(:/icons/btn_fullscreen1.png); }QPushButton#btn_screen:hover {border-image:url(:/icons/btn_fullscreen2.png); }QPushButton#btn_screen:checked {border-image:url(:/icons/btn_screen1.png); }QPushButton#btn_screen:checked:hover {border-image:url(:/icons/btn_screen2.png); }

三、运行