Linux下QT实现音乐播放器的基本功能，包含进度、音量调节

￡神魔★判官ぃ 2022-12-27 02:25 947阅读 0赞

在Linux系统下，通过QT对multimedia库的使用，实现音乐播放器的功能，包括开始播放、暂停播放、继续播放、终止播放、播放上一首、播放下一首、添加指定目录下的音乐、删除指定歌曲、清空列表、进度调节、音量调节。应用到QFileDialog、QStringList等类。

[完整代码：https://download.csdn.net/download/weixin\_43793181/20325393][https_download.csdn.net_download_weixin_43793181_20325393]

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]  
  
具体代码如下：  
main.c

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

player.h

#ifndef PLAYER_H
    #define PLAYER_H
    
    #include <QWidget>
    #include <QFileDialog>
    #include <QMediaPlayer>
    #include <QMediaPlaylist>
    #include <QListWidgetItem>
    
    
    namespace Ui { 
    class Player;
    }
    
    class Player : public QWidget
    { 
        Q_OBJECT
    
    public:
        explicit Player(QWidget *parent = 0);
        ~Player();
    
    private slots:
        void on_pushButton_close_clicked();
    
        void on_pushButton_start_clicked();
    
        void on_pushButton_add_clicked();
    
        void on_listWidget_itemDoubleClicked();
    
        void on_pushButton_stop_clicked();
    
        void on_pushButton_prev_clicked();
    
        void on_pushButton_next_clicked();
    
        void on_pushButton_clear_clicked();
    
        void on_pushButton_delete_clicked();
    
        void set_sider(qint64 duration);
    
        void set_value(qint64 position);
    
        void on_horizontalSlider_sound_valueChanged(int value);
    
        void on_horizontalSlider_speed_valueChanged(int value);
    
        void on_horizontalSlider_speed_sliderMoved(int position);
    
    private:
        Ui::Player *ui;
    
        //播放器
        QMediaPlayer *mplayer;
        //播放列表
        QMediaPlaylist *playlist;
        QString music_duration;
    };
    
    #endif // PLAYER_H

player.cpp

#include "player.h"
    #include "ui_player.h"
    #include <QDebug>
    
    Player::Player(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::Player)
    { 
        ui->setupUi(this);
    
        mplayer = new QMediaPlayer(this);
        playlist = new QMediaPlaylist(this);
        //设置播放模式
        playlist->setPlaybackMode(QMediaPlaylist::Loop);
        //设置播放器的播放列表
        mplayer->setPlaylist(playlist);
        ui->pushButton_stop->setEnabled(false);                                                                               //失能暂停按钮
    
    // this->setAutoFillBackground(true); //自定义背景
    // QPalette palette = this->palette();
    // palette.setBrush(QPalette::Window,QBrush(QPixmap("./background.jpeg"). //使用平滑的缩放方式
    // scaled(this->size(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation)));
    // this->setPalette(palette); //给widget加上背景图
    
    
        //连接信号和槽
        QObject::connect(mplayer,SIGNAL(durationChanged(qint64)),this,SLOT(set_sider(qint64)));
        QObject::connect(mplayer,SIGNAL(positionChanged(qint64)),this,SLOT(set_value(qint64)));
    }
    
    Player::~Player()
    { 
        delete ui;
    }
    
    void Player::on_pushButton_close_clicked()                                                                              //终止播放
    { 
        mplayer->stop();                                                                                                    //停止播放器
    
        ui->pushButton_stop->setText("暂停");
        ui->pushButton_stop->setEnabled(false);                                                                             //失能暂停按钮
    }
    
    void Player::on_pushButton_start_clicked()
    { 
        //指定当前播放文件
        int row = ui->listWidget->currentRow();
        playlist->setCurrentIndex(row);
        //设置音量
        mplayer->setVolume(ui->horizontalSlider_sound->value());
    
        mplayer->play();
    
        ui->pushButton_stop->setText("暂停");                                                                                //重置暂停按钮
        ui->pushButton_stop->setEnabled(true);                                                                              //使能暂停按钮
    
    }
    
    void Player::on_pushButton_add_clicked()                                                                                //添加音乐
    { 
        QStringList music_files =  QFileDialog::getOpenFileNames(this,"选择音乐文件","./music","*.mp3 *.WAV");
    
        for(int i = 0; i < ui->listWidget->count(); i++)                                                                    //去重
        { 
            for(int j = 0; j < music_files.count(); j++)
            { 
                if(ui->listWidget->item(i)->text() == music_files.at(j))
                { 
                    music_files.removeAt(j);
                    break;
                }
            }
        }
    
        if(music_files.isEmpty())                                                                                           //如果无添加文件，直接返回
            return;
    
        for(int i=0;i<music_files.count();i++)                                                                              //添加到listWidget和playlist
        { 
            QString file = music_files.at(i);
            playlist->addMedia(QUrl::fromLocalFile(file));                                                                  //把文件加入播放列表
        }
    
        ui->listWidget->addItems(music_files);                                                                              //将文件添加到listWidget
        ui->listWidget->setCurrentRow(0);                                                                                   //定位
    }
    
    void Player::on_listWidget_itemDoubleClicked()                                                                          //双击播放音乐
    { 
        on_pushButton_start_clicked();
    }
    
    void Player::on_pushButton_stop_clicked()                                                                               //暂停播放、继续播放音乐
    { 
        if(ui->pushButton_stop->text() == "暂停")
        { 
            ui->pushButton_stop->setText("继续");
            mplayer->pause();
        }
        else
        { 
            ui->pushButton_stop->setText("暂停");
            mplayer->play();
        }
    }
    
    void Player::on_pushButton_prev_clicked()                                                                               //上一首
    { 
        int row = ui->listWidget->currentRow();
        if(row == 0)
            row = ui->listWidget->count();
        row--;
        ui->listWidget->setCurrentRow(row);
    
        on_pushButton_start_clicked();
    }
    
    void Player::on_pushButton_next_clicked()                                                                               //下一首
    { 
        int row = ui->listWidget->currentRow();
        if(row == ui->listWidget->count()-1)
            row = 0;
        else
            row++;
        ui->listWidget->setCurrentRow(row);
        on_pushButton_start_clicked();
    }
    
    void Player::on_pushButton_clear_clicked()                                                                              //清空列表
    { 
        on_pushButton_close_clicked();
        ui->listWidget->clear();
    }
    
    void Player::on_pushButton_delete_clicked()                                                                             //删除音乐
    { 
        int row = ui->listWidget->currentRow();
        QListWidgetItem *item = ui->listWidget->takeItem(row);
        if(item)
        { 
            delete item;
        }
    
        playlist->removeMedia(row);
        on_pushButton_start_clicked();
    }
    
    //移动声音滑动条
    void Player::on_horizontalSlider_sound_valueChanged(int value)
    { 
        mplayer->setVolume(value);
        ui->label_sound->setText(QString("音量:%1").arg(value));                                                             //更新显示
    }
    
    //移动进度滑动条
    void Player::on_horizontalSlider_speed_valueChanged(int value)
    { 
        mplayer->setVolume(value);
    }
    
    //周期改变函数
    void Player::set_sider(qint64 duration)
    { 
        ui->horizontalSlider_speed->setRange(0,duration);                                           //设置进度条最大值
        music_duration = QString("%1:%2").arg(duration/1000/60).arg(duration/1000%60);              //显示周期
        ui->label_speed->setText(QString("00:00/%1").arg(music_duration));
        ui->listWidget->setCurrentRow(playlist->currentIndex());                                    //显示歌曲切换
    }
    
    //进度改变
    void Player::set_value(qint64 position)
    { 
        ui->horizontalSlider_speed->setValue(position);                                             //更新进度条的值
        ui->label_speed->setText(QString("%1:%2/%3").                                               //显示进度
            arg(position/1000/60).arg(position/1000%60).arg(music_duration));
    }
    
    //手动调整进度
    void Player::on_horizontalSlider_speed_sliderMoved(int position)
    { 
        mplayer->setPosition(position);
    }

[完整代码：https://download.csdn.net/download/weixin\_43793181/20325393][https_download.csdn.net_download_weixin_43793181_20325393]

[https_download.csdn.net_download_weixin_43793181_20325393]: https://download.csdn.net/download/weixin_43793181/20325393
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70]: /images/20221120/ca98c0759ce34a308d3ba44da3948919.png