Qt——Linux(Ubuntu、Arm板Linux)成功播放的Mplayer视频Demo

拼搏现实的明天。 2022-12-23 07:06 467阅读 0赞

> 在Ubuntu中安装Mplayer：[Qt——Ubuntu的安装Mplayer，及与Centos安装的区别；Mplayer的Demo试验【莫再踩坑了】][Qt_Ubuntu_Mplayer_Centos_Mplayer_Demo]

### **安装Mplayer成功之后，确定一下:是否在这个目录下/usr/bin存在mplayer目录：** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70][]

确定存在之后，可以运行这个Demo：

> 链接：[MplayerDemo成功项目][MplayerDemo] 【相对下面那文章里的示例来说，代码有改动：改了一些Bug（虽然还有好几个BUG存在）】  
> 提取码：YvtQ 
> 
> ——是从这篇文章《[Linux 基于QT的mplayer视频播放器（实现进度条的拖动、播放列表等）][Linux _QT_mplayer]》中下载的Demo成功示例

环境：

Linux操作系统：Ubuntu 14.0 LTS；

Qt编译器：“ Qt 5.8.0 gcc 64bit”；

Mplayer：Mplayer 1.3.0；

mainwindow.ui:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 2][]

mainwindow.h:

#ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    //#pragma execution_character_set("utf-8")
    #include <QMainWindow>
    #include <QPixmap>
    #include <QSize>
    #include <QProcess>
    #include <QDir>
    #include <QFileDialog>
    #include <QFile>
    #include <QTextStream>
    #include <QListWidget>
    #include <QStringList>
    #include <QListWidgetItem>
    #include <QByteArray>
    #include <QMessageBox>
    #include <QApplication>
    #include <QDesktopWidget>
    #include <QMouseEvent>
    
    namespace Ui {
    class MainWindow;
    }
    
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        explicit MainWindow(QWidget *parent = 0);
        ~MainWindow();
    
    private:
        Ui::MainWindow *ui;
        QPixmap pixmap;
        QProcess *process;//使用进程进行操作
        QString arg;//用来存放要使用的mplayer播放器路径
    
    
    public:
        QString fileName;
    
    private slots:
        void openFileSlot();//打开文件
        void deleteFileSlot();//删除文件
        void play(QString fileName);//播放
        void on_listWidget_itemDoubleClicked(QListWidgetItem *item);//项目双击播放
        void dataReceive();//接收视频信息(当前时间，总时间，进度)，并显示
        void zantingOrstartSlot();//暂停或开始
    
        void on_horizontalSlider_sliderMoved(int position);//移动进度条控制播放位置
        void backSlot();//后退
        void forwardSlot();//快进
        void lastSlot();//上一个
        void nextSlot();//下一个
        void reduceSlot();//减速
        void accelerateSlot();//加速
        void stopSlot();//停止
        void voiceSlot();//声音静音
        void on_voiceslider_sliderMoved(int position);//声音滑条
    
        void mousePressEvent(QMouseEvent *event);
    };
    
    #endif // MAINWINDOW_H

mainwindow.cpp:

#include "mainwindow.h"
    #include "ui_mainwindow.h"
    #include <iostream>
    #include <QDateTime>
    #include <QDebug>
    
    using namespace std;
    
    static double speed=1;
    
    MainWindow::MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
    {
        this->process = new QProcess;
        this->process->setProcessChannelMode(QProcess::MergedChannels);
    //    arg = "F:/mypler-vedio/MPlayer/mplayer.exe";//在Windows系统中安装Mplayer之后
        arg = "/usr/bin/mplayer";//在Linux系统中安装Mplayer之后,将作用于play()函数的start()
        ui->setupUi(this);
    
        QPixmap pixmap;
        pixmap.load(":/images/voice.png");//set the icon of function
        ui->voiceButton->setFixedSize(48, 48);
        ui->voiceButton->setIcon(pixmap);
        ui->voiceButton->setIconSize(QSize(48, 48));
        ui->voiceButton->setToolTip("音量");
        ui->voiceButton->show();
        ui->voiceslider->setSliderPosition(20);
        ui->voiceslider->setValue(20);
    
        QPixmap pixmap1;
        pixmap1.load(":/images/last.png");
        ui->lastButton->setFixedSize(48, 48);
        ui->lastButton->setIcon(pixmap1);
        ui->lastButton->setIconSize(QSize(48, 48));
        ui->lastButton->setToolTip("上一个");
        ui->lastButton->show();
    
        QPixmap pixmap2;
        pixmap2.load(":/images/next.png");
        ui->nextButton->setFixedSize(48, 48);
        ui->nextButton->setIcon(pixmap2);
        ui->nextButton->setIconSize(QSize(48, 48));
        ui->nextButton->setToolTip("下一个");
        ui->nextButton->show();
    
        QPixmap pixmap3;
        pixmap3.load(":/images/start.png");
        ui->startButton->setFixedSize(48, 48);
        ui->startButton->setIcon(pixmap3);
        ui->startButton->setIconSize(QSize(48, 48));
        ui->startButton->setToolTip("开始播放");
        ui->startButton->show();
    
        QPixmap pixmap5;
        pixmap5.load(":/images/manfang.png");
        ui->manButton->setFixedSize(48, 48);
        ui->manButton->setIcon(pixmap5);
        ui->manButton->setIconSize(QSize(48, 48));
        ui->manButton->setToolTip("减速播放");
        ui->manButton->show();
    
        QPixmap pixmap6;
        pixmap6.load(":/images/kuaifang.png");
        ui->kuaiButton->setFixedSize(48, 48);
        ui->kuaiButton->setIcon(pixmap6);
        ui->kuaiButton->setIconSize(QSize(48, 48));
        ui->kuaiButton->setToolTip("加速播放");
        ui->kuaiButton->show();
    
        QPixmap pixmap7;
        pixmap7.load(":/images/back.png");
        ui->backButton->setFixedSize(48, 48);
        ui->backButton->setIcon(pixmap7);
        ui->backButton->setIconSize(QSize(48, 48));
        ui->backButton->setToolTip("后退");
        ui->backButton->show();
    
        QPixmap pixmap8;
        pixmap8.load(":/images/fast.png");
        ui->fastButton->setFixedSize(48, 48);
        ui->fastButton->setIcon(pixmap8);
        ui->fastButton->setIconSize(QSize(48, 48));
        ui->fastButton->setToolTip("快进");
        ui->fastButton->show();
    
        QPixmap pixmap9;
        pixmap9.load(":/images/tingzhi.png");
        ui->tingzhiButton->setFixedSize(48, 48);
        ui->tingzhiButton->setIcon(pixmap9);
        ui->tingzhiButton->setIconSize(QSize(48, 48));
        ui->tingzhiButton->setToolTip("停止");
        ui->tingzhiButton->show();
    
        ui->centralWidget->setAutoFillBackground(true);//设置中心部件背景颜色
        QPalette p = ui->centralWidget ->palette();
        p.setColor(QPalette::Window,QColor(136, 136, 136));
        ui->centralWidget->setPalette(p);
    
        QFile dataFile("x.txt");
        if (dataFile.open(QFile::ReadOnly|QIODevice::Text))
        {
            QTextStream data(&dataFile);
            QStringList fonts;
            QString line;
            while (!data.atEnd())//逐行读取文本，并去除每行的回车
            {
                line = data.readLine();
                line.remove('\n');
                fonts<<line;
            }
            ui->listWidget->addItems(fonts);//把各行添加到listwidget
        }
    
        QObject::connect(ui->addfileButton,SIGNAL(clicked()),this,SLOT(openFileSlot()));//添加文件
        QObject::connect(ui->deleteButton,SIGNAL(clicked()),this,SLOT(deleteFileSlot()));//删除文件
        QObject::connect(ui->startButton,SIGNAL(clicked()),this,SLOT(zantingOrstartSlot()));//开始暂停
        QObject::connect(ui->backButton,SIGNAL(clicked()),this,SLOT(backSlot()));//后退
        QObject::connect(ui->fastButton,SIGNAL(clicked()),this,SLOT(forwardSlot()));//快进
        QObject::connect(ui->lastButton,SIGNAL(clicked()),this,SLOT(lastSlot()));//上一个
        QObject::connect(ui->nextButton,SIGNAL(clicked()),this,SLOT(nextSlot()));//下一个
        QObject::connect(ui->manButton,SIGNAL(clicked()),this,SLOT(reduceSlot()));//减速
        QObject::connect(ui->kuaiButton,SIGNAL(clicked()),this,SLOT(accelerateSlot()));//加速
        QObject::connect(ui->tingzhiButton,SIGNAL(clicked()),this,SLOT(stopSlot()));//停止
        QObject::connect(ui->voiceButton,SIGNAL(clicked()),this,SLOT(voiceSlot()));//声音静音
    
    }
    
    MainWindow::~MainWindow()
    {
        delete ui;
    }
    
    void MainWindow::zantingOrstartSlot()//暂停或者开始
    {
        this->process->write("pause\n");
        if(ui->startButton->toolTip() == "开始播放")
        {
            if(ui->listWidget->count() == 0)
            {
                QMessageBox::information(this,"open false","please add file first");
            }
            else
            {
                qDebug() << "connecting... ";
                QObject::connect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));
                this->process->write("get_time_length\n");//打印出当前文件的长度用秒表示。总时长
                this->process->write("get_time_pos\n");//打印出在文件的当前位置用秒表示，采用浮点数。时间位置，视频进度
                this->process->write("get_percent_pos\n");//打印出文件中的当前位置为整数百分比[0-100]。视频进度百分比
    
                qDebug() << "after connecting... ";
    
                QPixmap pixmap4;
                pixmap4.load(":/images/stop.png");
                ui->startButton->setFixedSize(48, 48);
                ui->startButton->setIcon(pixmap4);
                ui->startButton->setIconSize(QSize(48, 48));
                ui->startButton->setToolTip("暂停播放");
                ui->startButton->show();
    
                if(ui->listWidget->currentItem() == NULL)
                {
                    ui->listWidget->setCurrentRow(0);
                    qDebug() << "Null --------- setCurrentRow(0)";
                }
                play(ui->listWidget->currentItem()->text());
    
    
    
            }
        }
        else
        {
            qDebug() << "disconnecting... ";
            QObject::disconnect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));
    
            qDebug() << "after disconnecting... ";
    
            QPixmap pixmap3;
            pixmap3.load(":/images/start.png");
            ui->startButton->setFixedSize(48, 48);
            ui->startButton->setIcon(pixmap3);
            ui->startButton->setIconSize(QSize(48, 48));
            ui->startButton->setToolTip("开始播放");
            ui->startButton->show();
    
        }    
    
    }
    
    void MainWindow::openFileSlot()//打开文件添加列表
    {
        int k=0;
        QStringList filenames = QFileDialog::getOpenFileNames(this,"选择文件","/",tr("视频文件(*mp3 *mp4 *wma *3gp *rmvb *mkv *ts *wmv *h264)"));
    
        //筛选重复项
        if(ui->listWidget->count() != -1)
        {
            //2020.11.11我认为QStringList的iterator QList::end()迭代器的最后一项，指的是结束符、空值，
            //因为只选择了一个文件时，begin第一项与end最后一项不相等，从而进入For循环
            for (QStringList::Iterator j=filenames.begin();j!=filenames.end();++j)
            {
                for(int i=0;i<ui->listWidget->count();++i)
                {
                    if(*j == ui->listWidget->item(i)->text())//关键循环，判断某个文件路径与原有的多个视频路径是否存在相同
                    {
                        k=1;
                        continue;
                    }
                }
                if(k!=1)//只要K为1,某个文件路径就不需要放入listWidget播放列表，而是换下个for筛选下一个文件路径与多个已有视频路径是否存在相同
                {
                    ui->listWidget->addItem(*j);
                }
                else
                {
                    k=0;
                }           
            }
        }
        else
        {
            if(filenames.count()!=0)
            {
                ui->listWidget->addItems(filenames);
            }
        }
    
        //将listWidget中的项内容写入到txt文本中
        QStringList lines;
        QString line;
        int row=0;
        QFile file("x.txt");//打开该文件进入编辑模式
        if(file.open(QIODevice::WriteOnly))//如果被打开
        {
            file.resize("x.txt",0);//清空内容
            while(row<(ui->listWidget->count()))//从wistlidget里一行一行的读取文本并存入lines里边
            {
                line=ui->listWidget->item(row)->text();
                row++;
                lines<<line;
            }
            QTextStream stream( &file );//开始写入文本
            for ( QStringList::Iterator it=lines.begin();it!=lines.end();++it )
            stream<<*it<<"\r\n";//注意是"\r\n"！！！！！！如果是单个"\n"  保存文本的时候它不保留换行符！！！！
        }
        file.close();
    
    }
    
    void MainWindow::deleteFileSlot()//删除，2020.11.11不支持多条删除，只能选中一条删除
    {
        if(ui->listWidget->currentRow() == -1)
        {
            QMessageBox::information(this,"Error delete","Not select a flie or thie list is null");
        }
        else
        {
            ui->listWidget->takeItem(ui->listWidget->currentRow());//2020.11.11直接删除该item
    
            //将listWidget中的项内容写入到txt文本中
            QStringList lines;
            QString line;
            int row=0;
            QFile file("x.txt");//打开该文件进入编辑模式
            if(file.open(QIODevice::WriteOnly))//如果被打开
            {
                file.resize("x.txt",0);//清空内容
                while(row<(ui->listWidget->count()))//从wistlidget里一行一行的读取文本并存入lines里边
                {
                    line=ui->listWidget->item(row)->text();
                    row++;
                    lines<<line;
                    qDebug() << " lines == " << lines;
                }
                QTextStream stream( &file );//开始写入文本
                for ( QStringList::Iterator it=lines.begin();it!=lines.end();++it )
                stream<<*it<<"\r\n";//注意是"\r\n"！！！！！！如果是单个"\n"  保存文本的时候它不保留换行符！！！！
            }
            file.close();
        }
    
    }
    
    void MainWindow::dataReceive()//接收信息
    {
        this->process->write("get_time_length\n");
        this->process->write("get_time_pos\n");
        this->process->write("get_percent_pos\n");
        while(this->process->canReadLine())
        {
            QByteArray b(this->process->readLine());
            b.replace(QByteArray("\n"), QByteArray(""));
            QString s(b);
    
            if (b.startsWith("ANS_LENGTH"))  //输出视频总时间
            {
                int totalTimeNum = s.mid(11).toFloat();
                int sec = 0, min = 0, hour = 0;
                if(totalTimeNum < 60)
                {
                    sec = totalTimeNum;
                    min = 0;
                    hour= 0;
                }
                else if(totalTimeNum >= 60 && totalTimeNum <3600)
                {
                    sec = totalTimeNum%60;
                    min = totalTimeNum/60;
                    hour= 0;
                }
                else if(totalTimeNum > 3600)
                {
                    sec = totalTimeNum%60;
                    min = totalTimeNum/60%60;
                    hour= totalTimeNum/3600;
                }
    
                QString totalTime = QString("%1:%2:%3").arg(hour).arg(min).arg(sec);  //标准格式输出时间
                ui->totletimeLable->setText(totalTime);
                ui->horizontalSlider->setRange(0,totalTimeNum);
            }
            else if (b.startsWith("ANS_TIME_POSITION"))  //输出视频当前时间
            {
                int currentTimeNum = s.mid(18).toFloat();
                int sec = 0, min = 0, hour = 0;
                if(currentTimeNum < 60)
                {
                    sec = currentTimeNum;
                    min = 0;
                    hour= 0;
                }
                else if(currentTimeNum >= 60 && currentTimeNum <3600)
                {
                    sec = currentTimeNum%60;
                    min = currentTimeNum/60;
                    hour= 0;
                }
                else if(currentTimeNum > 3600)
                {
                    sec = currentTimeNum%60;
                    min = currentTimeNum/60%60;
                    hour= currentTimeNum/3600;
                }
    
                QString currentTime = QString("%1:%2:%3").arg(hour).arg(min).arg(sec);
                ui->currenttimeLable->setText(currentTime);
                ui->horizontalSlider->setValue(currentTimeNum);
            }
            else if(b.startsWith("ANS_PERCENT_POSITION"))
            {
                QString currentPercent = s.mid(21);
                ui->precentLable->setText(currentPercent+"%");//视频播放进度百分比
            }
        }
    }
    
    void MainWindow::play(QString fileName)//播放
    {
        QStringList arg1;
        this->process->kill();
        this->process=new QProcess;
        arg1 << fileName;
        arg1 << "-slave";//默认情况下，mplayer接受键盘的命令，而"-slave"使其不再接受键盘事件，而是作为后台程序运行，
                         //接受以“\n”结束的命令控制，这样我们可以在进程中给他发送命令，而不需要操作键盘了.
        arg1 << "-quiet"; //尽可能的不打印播放信息
    //    arg1 << "-fs";
        arg1 << "-zoom";//视频居中，四周黑条，全屏播放(好像是默认值
        arg1 << "-x";
        arg1 << "720";//指定视频x方向是720大小，y方向是576大小
        arg1 << "-y";
        arg1 << "576";
        arg1 << "-wid" << QString::number((unsigned int)(ui->widget->winId()));
                 // "-wid <窗口标识>" 是指让MPlayer依附于那个窗口，
                 //ui->widget->winId() 这个指令就是用来获取widget的标识码 ,
                 //这样视频播放的时候，就在这个部件里播放，相当于给他固定起来。
    
        connect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));
        this->process->start(arg,arg1);   //开始播放进程
    
        this->setWindowTitle(fileName);//设置当前播放的视频的标题名称
    
        QPixmap pixmap;
        pixmap.load(":/images/voice.png");
        QPixmap pixmap4;
        pixmap4.load(":/images/stop.png");
        ui->startButton->setFixedSize(48, 48);
        ui->startButton->setIcon(pixmap4);
        ui->startButton->setIconSize(QSize(48, 48));
        ui->startButton->setToolTip("暂停播放");
        ui->startButton->show();
    
    }
    
    void MainWindow::on_listWidget_itemDoubleClicked(QListWidgetItem *item)//项目双击播放
    {
          play(item->text());
    }
    
    /**
        定位视频的某些地方。
            0 是一个相对定位+/- <value>（默认值）。
            1 是定位<value>％在视频里。
            2 是寻求一个绝对位置的<value>秒。
     */
    void MainWindow::on_horizontalSlider_sliderMoved(int position)//进度条移动
    {
        this->process->write(QString("seek "+QString::number(position)+" 2\n").toUtf8());
    }
    void MainWindow::backSlot()//后退
    {
        this->process->write("seek -5 0\n");
    
    }
    void MainWindow::forwardSlot()//快进
    {
        this->process->write("seek +1 0\n");
    }
    void MainWindow::lastSlot()//上一个
    {
        if(ui->listWidget->currentRow() == 0)//当光标在第一个文件时，点击上一个光标移动到最下面的文件，不播放
        {
            ui->listWidget->setCurrentRow(ui->listWidget->count()-1);        
        }
        else
        {
            ui->listWidget->setCurrentRow(ui->listWidget->currentRow()-1);
    
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            QPixmap pixmap4;
            pixmap4.load(":/images/stop.png");
            ui->startButton->setFixedSize(48, 48);
            ui->startButton->setIcon(pixmap4);
            ui->startButton->setIconSize(QSize(48, 48));
            ui->startButton->setToolTip("暂停播放");
            ui->startButton->show();
    
        }
        play(ui->listWidget->currentItem()->text());
    
    }
    void MainWindow::nextSlot()//下一个
    {
        if(ui->listWidget->currentRow() == ui->listWidget->count()-1)
        {
            ui->listWidget->setCurrentRow(0);//当光标在最后一个文件时，点击下一个，光标移动到第一个，不播放
        }
        else
        {
            ui->listWidget->setCurrentRow(ui->listWidget->currentRow()+1);        
    
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            QPixmap pixmap4;
            pixmap4.load(":/images/stop.png");
            ui->startButton->setFixedSize(48, 48);
            ui->startButton->setIcon(pixmap4);
            ui->startButton->setIconSize(QSize(48, 48));
            ui->startButton->setToolTip("暂停播放");
            ui->startButton->show();
        }
    
        play(ui->listWidget->currentItem()->text());
    }
    
    void MainWindow::reduceSlot()//减速
    {
        speed=speed/2;
        this->process->write(QString("speed_set " + QString::number(speed)+" 2\n").toUtf8());
    }
    void MainWindow::accelerateSlot()//加速
    {
    
        speed=speed*2;
        this->process->write(QString("speed_set " + QString::number(speed) +" 2\n").toUtf8());
    
    }
    void MainWindow::stopSlot()//停止
    {
    
        this->process->write("quit\n");
        ui->horizontalSlider->setSliderPosition(0);
        ui->totletimeLable->clear();
        ui->currenttimeLable->clear();
        ui->precentLable->clear();
    
        QPixmap pixmap;
        pixmap.load(":/images/voice.png");
        QPixmap pixmap3;
        pixmap3.load(":/images/start.png");
        ui->startButton->setFixedSize(48, 48);
        ui->startButton->setIcon(pixmap3);
        ui->startButton->setIconSize(QSize(48, 48));
        ui->startButton->setToolTip("开始播放");
        ui->startButton->show();
    
    }
    void MainWindow::voiceSlot()//声音静音(待实现)
    {
        if(ui->voiceButton->toolTip() == "音量")
        {
            this->process->write("mute 1\n"); //开启静音
    
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            QPixmap pixmap1;
            pixmap1.load(":/images/novoice.png");
            ui->voiceButton->setFixedSize(48, 48);
            ui->voiceButton->setIcon(pixmap1);
            ui->voiceButton->setIconSize(QSize(48, 48));
            ui->voiceButton->setToolTip("静音");
            ui->voiceButton->show();
    
        }
        else
        {
            this->process->write("mute 0\n");      //关闭静音
    
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            ui->voiceButton->setFixedSize(48, 48);
            ui->voiceButton->setIcon(pixmap);
            ui->voiceButton->setIconSize(QSize(48, 48));
            ui->voiceButton->setToolTip("音量");
            ui->voiceButton->show();
    
        }
    
    
    }
    
    void MainWindow::on_voiceslider_sliderMoved(int position)//声音滑条
    {
        this->process->write(QString("volume " + QString::number(position) +" 2\n").toUtf8());
        if(position == 0)
        {
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            QPixmap pixmap1;
            pixmap1.load(":/images/novoice.png");
            ui->voiceButton->setFixedSize(48, 48);
            ui->voiceButton->setIcon(pixmap1);
             ui->voiceButton->setIconSize(QSize(48, 48));
            ui->voiceButton->setToolTip("静音");
            ui->voiceButton->show();
        }
        else
        {
            QPixmap pixmap;
            pixmap.load(":/images/voice.png");
            ui->voiceButton->setFixedSize(48, 48);
            ui->voiceButton->setIcon(pixmap);
            ui->voiceButton->setIconSize(QSize(48, 48));
            ui->voiceButton->setToolTip("音量");
            ui->voiceButton->show();
    
        }
    }
    
    
    void MainWindow::mousePressEvent(QMouseEvent *event)//鼠标单击实现视频播放暂停
    {
        this->process->write("pause\n");
        int x=event->x();
        int y=event->y();
        if((x>0&&x<720)&&(y>0&&y<576))
        {
            if((event->button() == Qt::LeftButton)&&(ui->startButton->toolTip() == "开始播放"))
            {
                qDebug() << "mouse   connecting... ";
                QObject::connect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));
                this->process->write("get_time_length\n");
                this->process->write("get_time_pos\n");
                this->process->write("get_percent_pos\n");
                QPixmap pixmap;
                pixmap.load(":/images/voice.png");
                QPixmap pixmap7;
                pixmap7.load(":/images/stop.png");
                ui->startButton->setFixedSize(48, 48);
                ui->startButton->setIcon(pixmap7);
                ui->startButton->setIconSize(QSize(48, 48));
                ui->startButton->setToolTip("暂停播放");
                ui->startButton->show();
    
                this->statusBar()->showMessage("开始",3*1000);//显示此时的状态,显示3秒
    
            }
    //不能用此语句，要用else
    // if((event->button() == Qt::LeftButton)&&(ui->startButton->toolTip() == "暂停播放"))
            else
            {
                QObject::disconnect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));
    
                QPixmap pixmap;
                pixmap.load(":/images/voice.png");
                QPixmap pixmap3;
                pixmap3.load(":/images/start.png");
                ui->startButton->setFixedSize(48, 48);
                ui->startButton->setIcon(pixmap3);
                ui->startButton->setIconSize(QSize(48, 48));
                ui->startButton->setToolTip("开始播放");
                ui->startButton->show();
    
                this->statusBar()->showMessage("暂停",3*1000);//显示此时的状态,显示3秒
            }
    
        }
    
    
    }

效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 3][]

[Qt_Ubuntu_Mplayer_Centos_Mplayer_Demo]: https://blog.csdn.net/qq_41042595/article/details/109594194
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70]: /images/20221120/64e997818f1a44a29fb0e143f0e89248.png
[MplayerDemo]: https://pan.baidu.com/s/1osq9Mw304dh6wiosBDflMw
[Linux _QT_mplayer]: https://blog.csdn.net/weixin_38890593/article/details/94456697
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201123181558162.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 2]: /images/20221120/285384802cc943c1a6347c5f2fbf8573.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDQyNTk1_size_16_color_FFFFFF_t_70 3]: /images/20221120/3c0f4a1b542a4604971c5b9eecb69be9.png