本文主要是介绍QT实现MP4播放器,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
1、实现功能
播放本地MP4文件。
1、可以将文件添加到列表中,双击列表中的歌曲进行播放。
2、实现视频的播放与暂停。
3、上一首和下一首的按钮选择功能。
4、视频名称的滚动显示。
5、当前的播放时长和总时长。
6、播放模式的选择:单曲循环、随机播放、顺序播放。
7、使用了水平和垂直布局。
8、视频音量的控制。
9、使用非UI界面实现。
2、项目环境
Qt Creator 5.0.2
3、widget.h
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QDebug>
#include <QListWidget>
#include <QVideoWidget>
#include <QMediaPlayer>
#include <QLabel>
#include <QPushButton>
#include <QComboBox>
#include <QMessageBox>
#include <QHBoxLayout>
#include <QFileDialog>
#include <QTime>
#include <QTimer>
#include <QResizeEvent>
#include <QSizePolicy>
#include <QListWidgetItem>
class Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();
private slots:void get_duration(qint64 duration);void update_playslidexvalue(qint64 position);void basic();private slots:void on_select_btn_clicked();void on_pre_btn_clicked();void on_next_btn_clicked();void onComboBoxIndexChanged(int index);void on_itemDouble_clicked(QListWidgetItem *item);void on_play_btn_clicked();void on_play_slidex_sliderMoved(int position);
private:QListWidget *list;QVideoWidget *video;QLabel *name_lab;QLabel *time_lab;QSlider *slider1;QSlider *slider2;QPushButton *select_btn;QPushButton *play_btn;QPushButton *pre_btn;QPushButton *next_btn;QComboBox *combox;QHBoxLayout *hbox1;QHBoxLayout *hbox2;QHBoxLayout *hbox3;QVBoxLayout *vbox;QMediaPlayer *player;QTimer *timer;QString song_name;int index;int lon;int hua;int mode;
};
#endif // WIDGET_H
4、widget.cpp
#include "widget.h"Widget::Widget(QWidget *parent): QWidget(parent)
{this->setGeometry(0, 0, 800, 600);/*------------------------------------*/this->list =new QListWidget(this);//设置视频展示列表/*------------------------------------*/this->video =new QVideoWidget(this);//设置视频播放this->video->setWindowTitle("视频播放器");this->video->setStyleSheet("border:2px solid black");/*------------------------------------*/this->name_lab =new QLabel(this);//设置视频名滚动this->name_lab->setGeometry(10,380,200,40);this->name_lab->setText("视频名");/*------------------------------------*/this->time_lab =new QLabel(this);//设置播放时间this->time_lab->setGeometry(500,380,200,40);this->time_lab->setText(" ");/*------------------------------------*/this->slider1 = new QSlider(this);//播放时间的滑块this->slider1->setOrientation(Qt::Horizontal);this->slider1->setGeometry(10,440, 780, 30);/*------------------------------------*/this->select_btn =new QPushButton(this);//添加到列表this->select_btn->setGeometry(10,520,100,40);this->select_btn->setText("添加到列表");/*------------------------------------*/this->play_btn =new QPushButton(this);// 播放/暂停this->play_btn->setGeometry(130,520,100,40);this->play_btn->setText("播放");/*------------------------------------*/this->pre_btn =new QPushButton(this);//this->pre_btn->setGeometry(250,520,100,40);this->pre_btn->setText("上一首");/*------------------------------------*/this->next_btn =new QPushButton(this);//this->next_btn->setGeometry(370,520,100,40);this->next_btn->setText("下一首");/*------------------------------------*/this->combox =new QComboBox(this);//this->combox->setGeometry(500,520,100,50);this->combox->addItem("单曲循环");this->combox->addItem("顺序播放");this->combox->addItem("随机播放");/*------------------------------------*/this->slider2 = new QSlider(this);//播放声音的滑块this->slider2->setOrientation(Qt::Horizontal);this->slider2->setGeometry(620,520, 130, 40);/*------------------------------------*///准备一个水平布局//给水平布局添加组件对象this->hbox1 = new QHBoxLayout;this->hbox1->addWidget(this->list,1);this->hbox1->addStretch();this->hbox1->addWidget(this->video,3);/*------------------------------------*/this->hbox2 = new QHBoxLayout;this->hbox2->addWidget(this->name_lab);this->hbox2->addWidget(this->time_lab);/*------------------------------------*/this->hbox3 = new QHBoxLayout;this->hbox3->addWidget(this->select_btn);this->hbox3->addWidget(this->play_btn);this->hbox3->addWidget(this->pre_btn);this->hbox3->addWidget(this->next_btn);this->hbox3->addWidget(this->combox);this->hbox3->addWidget(this->slider2);/*------------------------------------*///准备一个垂直布局this->vbox = new QVBoxLayout;//给垂直布局添加组件、添加布局this->vbox->addLayout(this->hbox1);this->vbox->addLayout(this->hbox2);this->vbox->addWidget(this->slider1);this->vbox->addLayout(this->hbox3);/*------------------------------------*///给界面设置布局为垂直布局this->setLayout(this->vbox);/*------------------------------------*///实例化播放器对象this->player=new QMediaPlayer(this);/*------------------------------------*/this->timer=new QTimer(this);//实例化定时器对象/*------------------------------------*/this->index=0;//实例化Indexthis->lon=0;//实例化lonthis->hua=0;//实例化huathis->mode=0;//实例化mode 默认为单曲循环this->player->setVolume(0);//声音默认为0/*------------------------------------*///槽函数与信号关联connect(this->select_btn,&QPushButton::clicked,this,&Widget::on_select_btn_clicked);// connect(this->select_btn,&QPushButton::clicked,this,&Widget::on_select_btn_clicked);connect(this->list, &QListWidget::itemDoubleClicked, this,&Widget::on_itemDouble_clicked);connect(this->play_btn,&QPushButton::clicked,this,&Widget::on_play_btn_clicked);connect(this->player,&QMediaPlayer::durationChanged,this,&Widget::get_duration);connect(this->player,&QMediaPlayer::positionChanged,this,&Widget::update_playslidexvalue);// 位置改变connect(this->slider1,&QSlider::sliderMoved,this,&Widget::on_play_slidex_sliderMoved);connect(this->pre_btn,&QPushButton::clicked,this,&Widget::on_pre_btn_clicked);connect(this->next_btn,&QPushButton::clicked,this,&Widget::on_next_btn_clicked);connect(this->combox, SIGNAL(currentIndexChanged(int)), this, SLOT(onComboBoxIndexChanged(int)));connect(this->timer,&QTimer::timeout,this,[=](){//获取当前的播放时长以及歌曲的总时长qint64 pos =this->player->position();qint64 dur =this->player->duration();QString str = QTime(0,0,0,0).addMSecs(pos).toString("mm:ss")+"/"+ QTime(0,0,0,0).addMSecs(dur).toString("mm:ss");//设置给时间标签去显示this->time_lab->setText(str);//歌曲名称的滚动显示this->index++;if(this->index==this->song_name.size()){this->index=0;}QString name=this->song_name.mid(this->index);this->name_lab->setText(name);if(dur==pos){if(this->mode==0){this->player->stop();this->player->play();}else if(this->mode==1){this->player->pause();if(this->hua<this->lon-1){this->hua++;}else{this->hua=0;}basic();}else if(this->mode==2){this->hua=rand()%this->lon;basic();}}});connect(this->slider2, &QSlider::sliderMoved, this->player, [=](qint64 position)
{//改变音量滑块的位置,调节音量的大小this->player->setVolume(position);
});}Widget::~Widget()
{}void Widget::get_duration(qint64 duration)
{ //获取歌曲时长//给滑块设置取值范围this->slider1->setRange(0,duration);
}//根据歌曲的播放位置变化改变滑块的位置
void Widget::update_playslidexvalue(qint64 position)
{// 改变滑块的值this->slider1->setValue(position);}void Widget::basic()
{//给播放器设置媒体资源QListWidgetItem *item = this->list->item(this->hua);QString filePath = item->data(Qt::UserRole).toString();this->player->setMedia(QMediaContent(QUrl(filePath)));//给播放器设置画面输出this->player->setVideoOutput(this->video);//给滑块设置取值范围this->slider1->setValue(0);//获取歌曲名称this->song_name=" "+QFileInfo(filePath).fileName();this->timer->start(1000);this->player->play();this->play_btn->setText("暂停");
}void Widget::on_select_btn_clicked()
{//选择歌曲资源QStringList filePaths = QFileDialog::getOpenFileNames(this,"选择","./","MP4(*.mp4)");for(int i=0;i<filePaths.size();i++){QString filePath=filePaths.at(i);QString fileName = QFileInfo(filePaths.at(i)).fileName();QListWidgetItem *item = new QListWidgetItem(QIcon("./icon/opn.jfif"), fileName);//将文件的完整路径存储在 QListwidgetItem 的用户数据中item->setData(Qt::UserRole,filePath);item->setData(Qt::UserRole+1,this->lon);this->lon++;this->list->addItem(item);}
}void Widget::on_itemDouble_clicked(QListWidgetItem *item)
{this->player->pause();QString filePath = item->data(Qt::UserRole).toString();this->hua= item->data(Qt::UserRole + 1).toInt();basic();
}void Widget::on_play_btn_clicked()
{if(this->lon!=0){if(this->play_btn->text()=="播放"){//启动定时器this->timer->start(1000);this->player->play();this->play_btn->setText("暂停");}else if(this->play_btn->text()=="暂停"){this->player->pause();this->timer->stop();this->play_btn->setText("播放");}}else{QMessageBox::information(this, "播放", "请先选择视频");}
}void Widget::on_pre_btn_clicked()
{this->player->pause();if(this->hua>0){this->hua--;basic();}else{QMessageBox::information(this, "上一首", "这是第一首了");}
}void Widget::on_next_btn_clicked()
{this->player->pause();if(this->hua<this->lon-1){this->hua++;basic();}else{QMessageBox::information(this, "下一首", "这是最后一首了");}
}void Widget::onComboBoxIndexChanged(int index)
{this->mode=index;switch (index){case 0:qDebug() << "单曲循环模式被选中";break;case 1:qDebug() << "顺序播放模式被选中";break;case 2:qDebug() << "随机播放模式被选中";break;default:break;}
}//根据滑块的位置变化改变歌曲的播放位置
void Widget::on_play_slidex_sliderMoved(int position)
{//改变歌曲的播放位置this->player->setPosition(position);
}
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