Qt播放器常用设置

QT += multimedia  multimediawidgets

  void positionChanged(qint64 position);

    void durationChanged(qint64 duration);

    void on_playButton_clicked();

    void updateDurationInfo(qint64 currentInfo);

 void on_treeView_player_doubleClicked(const QModelIndex &index);//这个是绑定文件双击打开，当然也可以修改成打开本地文件播放的形式。

void MainWindow::init()

 {//视频文件

     appPath=QCoreApplication::applicationDirPath();

    model = new QFileSystemModel();

    model->setRootPath(appPath);

    videoPath=appPath+"/player";

    ui->treeView_player->setModel(model);

    ui->treeView_player->setRootIndex(model->index(videoPath));

    m_mediaPlayer=new QMediaPlayer(ui->widget_player,QMediaPlayer::VideoSurface);

    //视频播放

    m_mediaPlayer=new QMediaPlayer(ui->widget_player,QMediaPlayer::VideoSurface);

    videoWidget = new QVideoWidget;

    videoWidget->setAspectRatioMode(Qt::IgnoreAspectRatio);

    playList=new QMediaPlaylist;

    //播放器布局

    QVBoxLayout  *layout=new QVBoxLayout;

    layout->addWidget(videoWidget);

    ui->widget_player->setLayout(layout);

    videoWidget->setPalette(Qt::black);

    ui->playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    //滑块设置

    ui->m_positionSlider->setRange(0, m_mediaPlayer->duration() / 1000);

    connect(ui->m_positionSlider, &QSlider::sliderMoved, this, &MainWindow::seek);

    ui->label_time->hide();
}

void MainWindow::initConnect()      //连接slide和时间（快进 快退）

{    

    connect(m_mediaPlayer,SIGNAL(durationChanged(qint64)),this,SLOT(durationChanged(qint64)));

    connect(m_mediaPlayer,SIGNAL(positionChanged(qint64)),this,SLOT(positionChanged(qint64)));

}

void MainWindow::on_playButton_clicked()            //播放暂停按钮

{

    if(m_mediaPlayer->state()==QMediaPlayer::PlayingState){

        m_mediaPlayer->pause();

        ui->playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));  //播放时显示播放按钮  }

    else {

        m_mediaPlayer->play();

        ui->playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause)); //暂停时显示播放按钮   }
}

void MainWindow::on_treeView_player_doubleClicked(const QModelIndex &index)             //视频目录双击

{    //如果是文件夹  返回

    if(model->isDir(index)){

        return;

    }

    QString path=model->filePath(index);

    playList->clear();//清空列表

    playList->addMedia(QUrl::fromLocalFile(path));

    m_mediaPlayer->setPlaylist(playList);

    m_mediaPlayer->setVideoOutput(videoWidget);

    m_mediaPlayer->play();

    if(m_mediaPlayer->state()==QMediaPlayer::PlayingState){

        ui->playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));

        ui->label_time->show();    }

}

void MainWindow::durationChanged(qint64 duration)           //视频时间设置

{

    m_duration = duration / 1000;

    ui->m_positionSlider->setMaximum((int)duration/1000);

}

void MainWindow::positionChanged(qint64 progress)             //滑块设置

{

    //if (!m_positionSlider->isSliderDown())

    ui-> m_positionSlider->setValue((int)progress / 1000);

    updateDurationInfo(progress / 1000);

}

void MainWindow::updateDurationInfo(qint64 currentInfo)        // slide时间显示格式设置

{

    QString tStr;

    if (currentInfo || m_duration) {

        QTime currentTime((currentInfo / 3600) % 60, (currentInfo / 60) % 60,

                          currentInfo % 60, (currentInfo * 1000) % 1000);

        QTime totalTime((m_duration / 3600) % 60, (m_duration / 60) % 60,

                        m_duration % 60, (m_duration * 1000) % 1000);

        QString format = "mm:ss";

        if (m_duration > 3600)

            format = "hh:mm:ss";

        tStr = currentTime.toString(format) + " / " + totalTime.toString(format);

    }

    ui->label_time->setText(tStr);

}

void MainWindow::seek(int seconds)                  //滑块视频快进快退等

{

    m_mediaPlayer->setPosition(seconds * 1000);

    //    m_mediaPlayer->play();

}