QT5杂谈（四）------Qt5中利用mplayer播放视频 - QTCN开发网

#include "showvideo.h"

ShowVideo::ShowVideo(QWidget *parent,QListWidgetItem *item,QListWidget *list,QString path) :
    QDialog(parent)
{
    //初始化窗口
    this->resize(1024,768);
    this->move(0,0);
    this->setStyleSheet(tr("background-color: rgba(255,255,255,100%)"));
    this->setWindowFlags(Qt::FramelessWindowHint);

    //初始化状态信息
    isFinish = false;
    isPause = false;

    //当前路径
    currentPath = path;

    //初始化图片数据
    showList = list;
    rowNum = showList->currentRow();
    rowCount = showList->count();
    currentItem = item;

    //文件名
    nameLabel = new QLabel(this);
    nameLabel->move(60,720);
    nameLabel->setText(currentItem->text());

    //显示图像的QLabel
    videoLabel = new QLabel(this);
    videoLabel->setStyleSheet("background-color: rgb(0,0,0)");
    videoLabel->move(10,10);
    videoLabel->resize(1004,678);

    //初始化进度条
    bar = new QProgressBar(this);
    bar->move(10,688);
    bar->resize(1004,15);
    bar->setMinimum(0);
    bar->setMaximum(99);
    bar->setTextVisible(true);
    bar->setValue(0);

    //设置return按钮属性
    retBtn = new QPushButton(this);
    retBtn->setIconSize(QSize(32,32));
    retBtn->setIcon(QIcon(tr(":/images/return.ico")));
    retBtn->resize(32,32);
    retBtn->setStyleSheet(tr("border-radius:10px;"));
    retBtn->setFocusPolicy(Qt::NoFocus);
    retBtn->move(984,715);
    connect(retBtn,SIGNAL(clicked()),this,SLOT(closeShowVideo()));

    //设置player\pause按钮属性
    startBtn = new QPushButton(this);
    startBtn->setIconSize(QSize(32,32));
    startBtn->setIcon(QIcon(tr(":/images/pause.ico")));
    startBtn->resize(32,32);
    startBtn->setStyleSheet("border-radius:10px;");
    startBtn->setFocusPolicy(Qt::NoFocus);
    startBtn->move(495,715);
    connect(startBtn,SIGNAL(clicked()),this,SLOT(start_pauseVideo()));

    //上一个视频按钮属性
    forwardBtn = new QPushButton(this);
    forwardBtn->setIconSize(QSize(32,32));
    forwardBtn->setIcon(QIcon(tr(":/images/forward.ico")));
    forwardBtn->resize(32,32);
    forwardBtn->setStyleSheet(tr("background-color: rgba(50%,50%,50%,0%);border-radius:10px;"));
    forwardBtn->setFocusPolicy(Qt::NoFocus);
    forwardBtn->move(440,715);
    connect(forwardBtn,SIGNAL(clicked()),this,SLOT(forwardVideo()));

    //下一个视频按钮属性
    nextBtn = new QPushButton(this);
    nextBtn->setIconSize(QSize(32,32));
    nextBtn->setIcon(QIcon(tr(":/images/next.ico")));
    nextBtn->resize(32,32);
    nextBtn->setStyleSheet(tr("background-color: rgba(50%,50%,50%,0%);border-radius:10px;"));
    nextBtn->setFocusPolicy(Qt::NoFocus);
    nextBtn->move(550,715);
    connect(nextBtn,SIGNAL(clicked()),this,SLOT(nextVideo()));

    //删除图片按钮属性
    deleteBtn = new QPushButton(this);
    deleteBtn->setIconSize(QSize(32,32));
    deleteBtn->setIcon(QIcon(tr(":/images/delete.ico")));
    deleteBtn->resize(32,32);
    deleteBtn->setStyleSheet(tr("background-color: rgba(50%,50%,50%,0%);border-radius:10px;"));
    deleteBtn->setFocusPolicy(Qt::NoFocus);
    deleteBtn->move(20,715);
    connect(deleteBtn,SIGNAL(clicked()),this,SLOT(deleteVideo()));

    //初始化进程
    play_process = new QProcess(this);
    play_process->setProcessChannelMode(QProcess::MergedChannels);
    connect(play_process,SIGNAL(readyReadStandardOutput()),this,SLOT(getVideoInfo()));

    //定时获取播放进度
    timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(sendPosCmd()));

    playVideo(currentPath + currentItem->text());
}

//获取视频信息
void ShowVideo::getVideoInfo()
{
    while(play_process->canReadLine())
    {
        QString message(play_process->readLine());
        if(message.left(21) == tr("ANS_PERCENT_POSITION="))
        {
            bar->setValue(message.remove(0,21).toInt(NULL,10));
        }
        //message即为读取的信息我们可以根据需要取我们要的信息如
        //文件总时间为：ANS_LENGTH=23.00
        //当前时间为：ANS_TIME_POSITION=23.00
    }
}

//播放视频
void ShowVideo::playVideo(QString fileName)
{
    QString str;
    str = tr("mplayer -slave -quiet -fps 15 ");
    str.append(fileName);
    str.append(tr(" -wid "));
    str.append(QString::number(videoLabel->winId()));
    play_process->start(str,QIODevice::ReadWrite);
    connect(play_process,SIGNAL(finished(int)),this,SLOT(getFinishStatus(int)));
    timer->start(30);
    nameLabel->setText(fileName.right(16));
    isFinish = false;
}

//获取播放进度百分比的命令
void ShowVideo::sendPosCmd()
{
    play_process->write("get_percent_pos\n");
}

//获取播放完成的状态
void ShowVideo::getFinishStatus(int status)
{
    if(status == 0)
    {
        bar->setValue(0);
        timer->stop();
        play_process->close();

        isFinish = true;
        startBtn->setIcon(QIcon(tr(":/images/start.ico")));
        isPause = true;
    }
}

//开始\暂停\重播播放
void ShowVideo::start_pauseVideo()
{
    if(isPause == false)
    {
        timer->stop();
        startBtn->setIcon(QIcon(tr(":/images/start.ico")));
        isPause = true;
        play_process->write("pause\n");

    }else
    {
        startBtn->setIcon(QIcon(tr(":/images/pause.ico")));
        isPause = false;

        if(!isFinish)
        {
            timer->start(30);
            play_process->write("pause\n");

        }else
        {
            this->playVideo(currentPath + showList->item(rowNum)->text());
        }
    }
}

//播放上一个视频
void ShowVideo::forwardVideo()
{
    QListWidgetItem *item;

    bar->setValue(0);
    timer->stop();
    play_process->close();

    startBtn->setIcon(QIcon(tr(":/images/pause.ico")));
    isPause = false;

    if(rowNum == 0)
    {
        rowNum = rowCount - 1;
        item = showList->item(rowNum);
        this->playVideo(currentPath + item->text());
        return;
    }

    rowNum--;

    item = showList->item(rowNum);
    this->playVideo(currentPath + item->text());
    return;
}

//播放下一个视频
void ShowVideo::nextVideo()
{
    QListWidgetItem *item;

    bar->setValue(0);
    timer->stop();
    play_process->close();

    startBtn->setIcon(QIcon(tr(":/images/pause.ico")));
    isPause = false;

    if(rowNum == rowCount - 1)
    {
        rowNum = 0;
        item = showList->item(rowNum);
        this->playVideo(currentPath + item->text());

        return;
    }

    rowNum++;

    item = showList->item(rowNum);
    this->playVideo(currentPath + item->text());
}

//删除视频文件
void ShowVideo::deleteVideo()
{
    int ret;
    QListWidgetItem *item;

    ret = QMessageBox::warning(this,NULL,
                               tr("是否删除").append(showList->item(rowNum)->text()).append(tr("?")),
                               QMessageBox::Yes | QMessageBox::No);
    if(ret == QMessageBox::Yes)
    {
        QFile::remove(currentPath + showList->item(rowNum)->text());
        showList->removeItemWidget(showList->item(rowNum));

        //删除item
        item = showList->takeItem(rowNum);
        showList->removeItemWidget(item);
        delete item;

        rowCount--;

        if(rowCount == 0)
        {
            bar->setValue(0);
            timer->stop();
            play_process->close();

            startBtn->setIcon(QIcon(tr(":/images/start.ico")));
            isPause = true;

            videoLabel->setStyleSheet(tr("background-color: rgba(255,255,255,255)"));

            nameLabel->setText("");

            return;
        }

        if(rowNum == rowCount)
        {
            rowNum = rowCount - 1;
        }

        item = showList->item(rowNum);

        bar->setValue(0);
        timer->stop();
        play_process->close();

        startBtn->setIcon(QIcon(tr(":/images/pause.ico")));
        isPause = false;
        playVideo(currentPath + item->text());
    }
}
//返回上一级
void ShowVideo::closeShowVideo()
{
    timer->stop();
    play_process->close();
    emit quitApp();
    this->close();
}