QT设计实现视频播放器的功能，并移植到开发板上运行

电玩女神 2022-12-27 02:26 148阅读 0赞

通过QT对mplayer的应用，实现视频播放器的功能，包括开始播放、暂停播放、继续播放、终止播放、播放上一个、播放下一个、添加指定目录下的视频、删除指定视频、清空列表。应用到QFileDialog、QStringList等类，并交叉编译移植到开发板上运行。

界面效果如下图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70]  
  
  
mymplayer.h

#ifndef MYMPLAYER_H
    #define MYMPLAYER_H
    
    #include <QWidget>
    #include <QProcess>
    #include <QListWidgetItem>
    
    QT_BEGIN_NAMESPACE
    namespace Ui {  class MyMplayer; }
    QT_END_NAMESPACE
    
    class MyMplayer : public QWidget
    { 
        Q_OBJECT
    
    public:
        MyMplayer(QWidget *parent = nullptr);
        ~MyMplayer();
    
    private slots:
        void on_pushButton_addvideo_clicked();
    
        void on_pushButton_play_clicked();
    
        void on_pushButton_stop_clicked();
    
        void on_pushButton_pause_clicked();
    
        void on_pushButton_prev_clicked();
    
        void on_pushButton_next_clicked();
    
        void on_pushButton_delete_clicked();
    
        void on_pushButton_clear_clicked();
    
        void on_listWidget_itemDoubleClicked();
    
    private:
        Ui::MyMplayer *ui;
        QProcess *p;
        QString current_video;
    };
    #endif // MYMPLAYER_H

mymplayer.cpp

#include "mymplayer.h"
    #include "ui_mymplayer.h"
    #include <QFileDialog>
    
    MyMplayer::MyMplayer(QWidget *parent)
        : QWidget(parent)
        , ui(new Ui::MyMplayer)
    { 
        ui->setupUi(this);
    
        p = new QProcess(this);
    
        ui->pushButton_pause->setEnabled(false);
    }
    
    MyMplayer::~MyMplayer()
    { 
        delete ui;
    }
    
    //添加
    void MyMplayer::on_pushButton_addvideo_clicked()
    { 
        QStringList video_files = QFileDialog::getOpenFileNames(this,"选择视频文件","/mnt/sd/video","*.mp4 *.avi *wmv");
    
        //去重
        for(int i=0;i<ui->listWidget->count();i++)
        { 
            for(int j=0;j<video_files.count();j++)
            { 
                if(ui->listWidget->item(i)->text()==video_files.at(j))
                { 
                    video_files.removeAt(j);
                    break;
                }
            }
        }
    
        //如果无添加文件，直接返回
        if(video_files.isEmpty())
            return;
    
        //添加到listWid
        ui->listWidget->addItems(video_files);
        //定位
        ui->listWidget->setCurrentRow(0);
    }
    
    //播放
    void MyMplayer::on_pushButton_play_clicked()
    { 
        //只有没有运行才开始播放
        if(p->state()==QProcess::Running)
        { 
            p->kill();
            p->waitForFinished();
        }
    
        QString cmd = QString("mplayer");
        QStringList args;//参数
        //记录当前正在播放的视频
        current_video = ui->listWidget->currentItem()->text();
        args<<"-quiet"<<"-slave"<<"-zoom"<<"-x"<<"600"
           <<"-y"<<"360"<<current_video<<"&";
    
        p->start(cmd,args);
    
        ui->pushButton_pause->setText("暂停");
        ui->pushButton_pause->setEnabled(true);
    }
    
    //停止
    void MyMplayer::on_pushButton_stop_clicked()
    { 
        p->kill();
        p->waitForFinished();
    
        ui->pushButton_pause->setText("暂停");
        ui->pushButton_pause->setEnabled(false);
    }
    
    //暂停/继续
    void MyMplayer::on_pushButton_pause_clicked()
    { 
        QString cmd = QString("killall");
        QStringList args;//参数
    
        if(ui->pushButton_pause->text()=="暂停")
        { 
            args<<"-STOP"<<"mplayer"<<"&";
            ui->pushButton_pause->setText("继续");
        }
        else
        { 
            args<<"-CONT"<<"mplayer"<<"&";
            ui->pushButton_pause->setText("暂停");
        }
        //阻塞执行
        p->execute(cmd,args);
    }
    
    void MyMplayer::on_pushButton_prev_clicked()
    { 
        int row = ui->listWidget->currentRow();
        if(row == 0)
            row = ui->listWidget->count();
        row--;
        ui->listWidget->setCurrentRow(row);
        p->kill();
        p->waitForFinished();
    
        QString cmd = QString("mplayer");
        QStringList args;//参数
        //记录当前正在播放的视频
        current_video = ui->listWidget->currentItem()->text();
        args<<"-quiet"<<"-slave"<<"-zoom"<<"-x"<<"600"
           <<"-y"<<"360"<<current_video<<"&";
        p->start(cmd,args);
    }
    
    void MyMplayer::on_pushButton_next_clicked()
    { 
        int row = ui->listWidget->currentRow();
        if(row == ui->listWidget->count()-1)
            row = 0;
        else
            row++;
        ui->listWidget->setCurrentRow(row);
        p->kill();
        p->waitForFinished();
    
        QString cmd = QString("mplayer");
        QStringList args;//参数
        //记录当前正在播放的视频
        current_video = ui->listWidget->currentItem()->text();
        args<<"-quiet"<<"-slave"<<"-zoom"<<"-x"<<"600"
           <<"-y"<<"360"<<current_video<<"&";
        p->start(cmd,args);
    
    
    }
    
    void MyMplayer::on_pushButton_delete_clicked()
    { 
        if(current_video == ui->listWidget->currentItem()->text())
        { 
            p->kill();
            p->waitForFinished();
        }
    
        int row = ui->listWidget->currentRow();
    
        QListWidgetItem *item = ui->listWidget->takeItem(row);
        if(item)
        { 
            delete item;
            on_pushButton_play_clicked();
        }
    }
    
    void MyMplayer::on_pushButton_clear_clicked()
    { 
        ui->listWidget->clear();
        on_pushButton_stop_clicked();
    }
    
    void MyMplayer::on_listWidget_itemDoubleClicked()
    { 
        on_pushButton_play_clicked();
    }

main.cpp

#include "mymplayer.h"
    
    #include <QApplication>
    
    int main(int argc, char *argv[])
    { 
        QApplication a(argc, argv);
        MyMplayer w;
        w.show();
        return a.exec();
    }

[完整工程代码：https://download.csdn.net/download/weixin\_43793181/20335038][https_download.csdn.net_download_weixin_43793181_20335038]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70]: /images/20221120/48e6bc3f394c46f694ccdc41dfa06ad7.png
[https_download.csdn.net_download_weixin_43793181_20335038]: https://download.csdn.net/download/weixin_43793181/20335038