基于Qt的视频播放器
#include "mainwindow.h"#include <QCoreApplication>
#include <QFileInfoList>
#include <QDir>
#include <QTextEdit>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
Delay(1000);
videoLayout(); //视频播放器布局初始化
mediaPlayerInit(); //媒体初始化
scanVideoFiles(); //扫描本地视频
pushButton->setCheckable(true);//设置播放、全屏按钮初始状态
pushButton->setCheckable(true);
connect(pushButton, &QPushButton::clicked,
this,
&MainWindow::btn_play_clicked); //播放按钮槽函数
connect(pushButton, &QPushButton::clicked,
this,
&MainWindow::btn_next_clicked); //切换按钮槽函数
connect(pushButton, &QPushButton::clicked,
this,
&MainWindow::btn_volmedown_clicked); //音量减按钮槽函数
connect(pushButton, &QPushButton::clicked,
this,
&MainWindow::btn_volmeup_clicked); //音量加按钮槽函数
connect(pushButton, &QPushButton::clicked,
this,
&MainWindow::btn_fullscreen_clicked); //全屏按钮槽函数
connect(listWidget, SIGNAL(itemClicked(QListWidgetItem*)),
this,
SLOT(listWidgetCliked(QListWidgetItem*))); //播放列表项目被选中
connect(videoPlayer, SIGNAL(stateChanged(QMediaPlayer::State)),
this,
SLOT(mediaPlayerStateChanged(QMediaPlayer::State)));//播放器状态改变
connect(mediaPlaylist, SIGNAL(currentIndexChanged(int)),
this,
SLOT(mediaPlaylistCurrentIndexChanged(int))); //媒体改变，更新播放列表的选中行
connect(videoPlayer, SIGNAL(durationChanged(qint64)),
this,
SLOT(musicPlayerDurationChanged(qint64))); //(总时间）
connect(videoPlayer, SIGNAL(positionChanged(qint64)),
this,
SLOT(mediaPlayerPositionChanged(qint64))); //(当前时间）
connect(durationSlider, &QSlider::sliderReleased,
this,
&MainWindow::durationSliderReleased); //滑块移动时更新视频显示位置
connect(volumeSlider, &QSlider::sliderReleased,
this,
&MainWindow::volumeSliderReleased); //滑块移动时更新音量
}
void MainWindow::Delay(int msec)
{ // 这个最准
/*非阻塞方式延时,现在很多人推荐的方法*/
QEventLoop loop;
QTimer::singleShot(msec, &loop, SLOT(quit()));
loop.exec();
}
MainWindow::~MainWindow()
{
}
void MainWindow::videoLayout()
{
this->setGeometry(0, 0, 800, 480);
//this->setMinimumSize(800, 480);
//this->setMaximumSize(800, 480);
QPalette pal; //设置调色板格式
pal.setColor(QPalette::WindowText, Qt::white);
for (int i = 0; i < 3; i++) { //水平容器初始化
hWidget = new QWidget();
hWidget->setAutoFillBackground(true);
hBoxLayout = new QHBoxLayout();
}
for (int i = 0; i < 2; i++) { //垂直容器初始化
vWidget = new QWidget();
vWidget->setAutoFillBackground(true);
vBoxLayout = new QVBoxLayout();
}
for (int i = 0; i < 2; i++) { //Label
label = new QLabel();
}
for (int i = 0; i < 5; i++) { //按钮初始化
pushButton = new QPushButton();
pushButton->setMaximumSize(44, 44);
pushButton->setMinimumSize(44, 44);
}
vWidget->setObjectName("vWidget0"); //设置对象名称
vWidget->setObjectName("vWidget1");
hWidget->setObjectName("hWidget1");
hWidget->setObjectName("hWidget2");
pushButton->setObjectName("btn_play");
pushButton->setObjectName("btn_next");
pushButton->setObjectName("btn_volumedown");
pushButton->setObjectName("btn_volumeup");
pushButton->setObjectName("btn_screen");
QFont font;
font.setPixelSize(18);
label->setFont(font); //Label初始化（播放时间）
label->setFont(font);
//pal.setColor(QPalette::WindowText, Qt::white);
label->setPalette(pal);
label->setPalette(pal);
label->setText("00:00");
label->setText("/00:00");
durationSlider = new QSlider(Qt::Horizontal); //Slider初始化（播放时间条）
durationSlider->setMaximumHeight(15);
durationSlider->setObjectName("durationSlider");
volumeSlider = new QSlider(Qt::Horizontal); //Slider初始化（音量条）
volumeSlider->setRange(0, 100);
volumeSlider->setMaximumWidth(80);
volumeSlider->setObjectName("volumeSlider");
volumeSlider->setValue(50);
listWidget = new QListWidget(); //ListWidget初始化（播放列表）
listWidget->setObjectName("listWidget");
listWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); //内容太大无法装下时，显示滚动条，否则不显示
listWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//listWidget->setFocusPolicy(Qt::NoFocus);
videoWidget = new QVideoWidget(); //视频显示窗口
videoWidget->setStyleSheet("border-image: none;"
"background: transparent;"
"border:none");
/**************************视频区域布局*****************************/
vWidget->setMinimumSize(300, 480);
vWidget->setMaximumWidth(300);
videoWidget->setMinimumSize(500, 480);
hBoxLayout->addWidget(videoWidget);
hBoxLayout->addWidget(vWidget);
hWidget->setLayout(hBoxLayout);
hBoxLayout->setContentsMargins(0, 0, 0, 0);
setCentralWidget(hWidget);
/**************************播放列表区域布局*****************************/
QSpacerItem *vSpacer0 = new QSpacerItem(0, 80,
QSizePolicy::Minimum,
QSizePolicy::Maximum);
vBoxLayout->addWidget(listWidget);
vBoxLayout->addSpacerItem(vSpacer0);
vBoxLayout->setContentsMargins(0, 0, 0, 0);//页边空白
vWidget->setLayout(vBoxLayout);
hWidget->setMaximumHeight(15);
hWidget->setMinimumHeight(65);
vBoxLayout->addWidget(hWidget);
vBoxLayout->addWidget(hWidget);
vBoxLayout->setAlignment(Qt::AlignCenter);//对齐方式
vWidget->setLayout(vBoxLayout);
vWidget->setParent(this);
vWidget->setGeometry(0, this->height() - 80, this->width(), 80);
vBoxLayout->setContentsMargins(0, 0, 0, 0);
vWidget->raise(); //位于最上层
/**************************滑块区域布局*****************************/
hBoxLayout->addWidget(durationSlider);
hBoxLayout->setContentsMargins(0, 0, 0, 0);
hWidget->setLayout(hBoxLayout);
/* H2布局 */ QSpacerItem *hSpacer0 = new QSpacerItem(300, 80,
QSizePolicy::Expanding,
QSizePolicy::Maximum);
hBoxLayout->addSpacing(20);
hBoxLayout->addWidget(pushButton);
hBoxLayout->addSpacing(10);
hBoxLayout->addWidget(pushButton);
hBoxLayout->addSpacing(10);
hBoxLayout->addWidget(pushButton);
hBoxLayout->addWidget(volumeSlider);
hBoxLayout->addWidget(pushButton);
hBoxLayout->addWidget(label);
hBoxLayout->addWidget(label);
hBoxLayout->addSpacerItem(hSpacer0);
hBoxLayout->addWidget(pushButton);
hBoxLayout->addSpacing(20);
hBoxLayout->setContentsMargins(0, 0, 0, 0);
hBoxLayout->setAlignment(Qt::AlignLeft | Qt::AlignTop);
hWidget->setLayout(hBoxLayout);
}
void MainWindow::mediaPlayerInit() //媒体初始化
{
videoPlayer = new QMediaPlayer(this);
mediaPlaylist = new QMediaPlaylist(this);
mediaPlaylist->clear();
videoPlayer->setPlaylist(mediaPlaylist); //设置视频播放器的列表为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%
}
void MainWindow::scanVideoFiles() //扫描视频文件
{
QDir dir(QCoreApplication::applicationDirPath() + "/myVideo");
QDir dirbsolutePath(dir.absolutePath());
/* 如果目录存在 */
if (dirbsolutePath.exists()) {
/* 定义过滤器 */
QStringList filter;
/* 包含所有xx后缀的文件 */
filter << "*.mp4" << "*.mkv" << "*.wmv" << "*.avi" << "*.ts";
/* 获取该目录下的所有文件 */
QFileInfoList files = dirbsolutePath.entryInfoList(filter, QDir::Files);
/* 遍历 */
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 */
listWidget->addItem(info.fileName);
} else {
qDebug()<< mediaPlaylist->errorString().toUtf8().data() << endl;
qDebug()<< "Error number:" << mediaPlaylist->error() << endl;
}
}
}
}
void MainWindow::btn_play_clicked() /* 播放按钮 */
{
int state = videoPlayer->state(); //获取视频播放状态
switch (state) {
case QMediaPlayer::StoppedState: //视频状态如果为：停止
videoPlayer->play(); //播放
break;
case QMediaPlayer::PlayingState: //视频状态如果为：正在播放
videoPlayer->pause(); //停止播放
break;
case QMediaPlayer::PausedState: //视频状态如果为：暂停
videoPlayer->play(); //播放
break;
}
}
void MainWindow::btn_next_clicked() /* 切换按钮 */
{
videoPlayer->stop(); //停止播放
int count = mediaPlaylist->mediaCount();//获取播放列表的视频数
if (0 == count) //如果视频数为0
return; //中断函数执行，返回调用函数处
mediaPlaylist->next();
videoPlayer->play();
}
void MainWindow::btn_volmedown_clicked() /* 音量减按钮 */
{
volumeSlider->setValue(volumeSlider->value() - 5); //点击每次音量-5
videoPlayer->setVolume(volumeSlider->value());
}
void MainWindow::btn_volmeup_clicked() /* 音量加按钮 */
{
volumeSlider->setValue(volumeSlider->value() + 5); //点击每次音量+5
videoPlayer->setVolume(volumeSlider->value());
}
void MainWindow::btn_fullscreen_clicked() /* 全屏按钮 */
{
vWidget->setVisible(!pushButton->isChecked()); //全屏/非全屏操作
}
void MainWindow::listWidgetCliked(QListWidgetItem *item) //播放列表点击
{
videoPlayer->stop();
mediaPlaylist->setCurrentIndex(listWidget->row(item));
videoPlayer->play();
}
void MainWindow::mediaPlayerStateChanged(QMediaPlayer::State state) //播放器状态改变
{
switch (state) {
case QMediaPlayer::StoppedState:
pushButton->setChecked(false);
break;
case QMediaPlayer::PlayingState:
pushButton->setChecked(true);
break;
case QMediaPlayer::PausedState:
pushButton->setChecked(false);
break;
}
}
void MainWindow::mediaPlaylistCurrentIndexChanged(int index) //媒体改变，更新播放列表的选中行
{
if (-1 == index)
return;
listWidget->setCurrentRow(index); //设置列表正在播放的项
}
void MainWindow::musicPlayerDurationChanged(qint64 duration) //视频时间滑块(总时间）
{
durationSlider->setRange(0, duration / 1000);
int second= duration / 1000;
int minute = second / 60;
second %= 60;
QString mediaDuration;
mediaDuration.clear();
if (minute >= 10)
mediaDuration = QString::number(minute, 10);
else
mediaDuration = "0" + QString::number(minute, 10);
if (second >= 10)
mediaDuration += ":" + QString::number(second, 10);
else
mediaDuration += ":0" + QString::number(second, 10);
label->setText("/" + mediaDuration); //显示媒体总长度时间
}
void MainWindow::mediaPlayerPositionChanged(qint64 position) //视频时间滑块(当前时间）
{
if (!durationSlider->isSliderDown())
durationSlider->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);
else
mediaPosition = "0" + QString::number(minute, 10);
if (second >= 10)
mediaPosition += ":" + QString::number(second, 10);
else
mediaPosition += ":0" + QString::number(second, 10);
label->setText(mediaPosition); //显示现在播放的时间
}
void MainWindow::durationSliderReleased()
{
videoPlayer->setPosition(durationSlider->value() * 1000); //设置媒体播放的位置
}
void MainWindow::volumeSliderReleased()
{
videoPlayer->setVolume(volumeSlider->value()); //设置音量
}
void MainWindow::resizeEvent(QResizeEvent *event)//重写窗口大小设置事件
{
Q_UNUSED(event);
vWidget->setGeometry(0, this->height() - 80, this->width(), 80);
}
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