Qt 一个简单的基于mplayer的视频播放器

一个简单的基于mplayer的视频播放器 刚学习Qt不久，做了一个简单的额视频播放器，可实现简单的快进、后退、减速播放、加速播放、声音的调控、暂停、开始、截图等。 根据现有的进行了一些功能的改进：双击屏幕亦实现暂停、播放，加载的列表可一直保存。

界面

由于截图工具截取不了播放的画面，只能将就看了，界面就是这样的额。

下面直接上代码

代码：

// An highlighted block//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_OBJECTpublic: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// QString currentPercent;// QString currentStr;// QString totalTime;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 screenshotSlot();//截图void mousePressEvent(QMouseEvent *event);};#endif // MAINWINDOW_H//mainwindow.app#include "mainwindow.h"#include "ui_mainwindow.h"#include <iostream>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";ui->setupUi(this);QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");ui->voiceButton->setFixedSize(pixmap.width(),pixmap.height());ui->voiceButton->setIcon(pixmap);ui->voiceButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->voiceButton->setToolTip("音量");ui->voiceButton->show();ui->voiceslider->setSliderPosition(20);ui->voiceslider->setValue(20);QPixmap pixmap1;pixmap1.load("E:/VS2013 QT/New_Qt Creator/vedio-player/last.png");ui->lastButton->setFixedSize(pixmap.width(),pixmap.height());ui->lastButton->setIcon(pixmap1);ui->lastButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->lastButton->setToolTip("上一个");ui->lastButton->show();QPixmap pixmap2;pixmap2.load("E:/VS2013 QT/New_Qt Creator/vedio-player/next.png");ui->nextButton->setFixedSize(pixmap.width(),pixmap.height());ui->nextButton->setIcon(pixmap2);ui->nextButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->nextButton->setToolTip("下一个");ui->nextButton->show();QPixmap pixmap3;pixmap3.load("E:/VS2013 QT/New_Qt Creator/vedio-player/start.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap3);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->startButton->setToolTip("开始播放");ui->startButton->show();QPixmap pixmap5;pixmap5.load("E:/VS2013 QT/New_Qt Creator/vedio-player/manfang.png");ui->manButton->setFixedSize(pixmap.width(),pixmap.height());ui->manButton->setIcon(pixmap5);ui->manButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->manButton->setToolTip("减速播放");ui->manButton->show();QPixmap pixmap6;pixmap6.load("E:/VS2013 QT/New_Qt Creator/vedio-player/kuaifang.png");ui->kuaiButton->setFixedSize(pixmap.width(),pixmap.height());ui->kuaiButton->setIcon(pixmap6);ui->kuaiButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->kuaiButton->setToolTip("加速播放");ui->kuaiButton->show();QPixmap pixmap7;pixmap7.load("E:/VS2013 QT/New_Qt Creator/vedio-player/back.png");ui->backButton->setFixedSize(pixmap.width(),pixmap.height());ui->backButton->setIcon(pixmap7);ui->backButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->backButton->setToolTip("后退");ui->backButton->show();QPixmap pixmap8;pixmap8.load("E:/VS2013 QT/New_Qt Creator/vedio-player/fast.png");ui->fastButton->setFixedSize(pixmap.width(),pixmap.height());ui->fastButton->setIcon(pixmap8);ui->fastButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->fastButton->setToolTip("快进");ui->fastButton->show();QPixmap pixmap9;pixmap9.load("E:/VS2013 QT/New_Qt Creator/vedio-player/tingzhi.png");ui->tingzhiButton->setFixedSize(pixmap.width(),pixmap.height());ui->tingzhiButton->setIcon(pixmap9);ui->tingzhiButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->tingzhiButton->setToolTip("停止");ui->tingzhiButton->show();QPixmap pixmap10;pixmap10.load("E:/VS2013 QT/New_Qt Creator/vedio-player/cut.jpg");ui->shotscreenButton->setFixedSize(pixmap.width(),pixmap.height());ui->shotscreenButton->setIcon(pixmap10);ui->shotscreenButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->shotscreenButton->setToolTip("截屏");ui->shotscreenButton->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QObject::connect(ui->shotscreenButton,SIGNAL(clicked()),this,SLOT(screenshotSlot()));//}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{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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap4;pixmap4.load("E:/VS2013 QT/New_Qt Creator/vedio-player/stop.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap4);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->startButton->setToolTip("暂停播放");ui->startButton->show();}}else{QObject::disconnect(this->process,SIGNAL(readyReadStandardOutput()),this,SLOT(dataReceive()));QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap3;pixmap3.load("E:/VS2013 QT/New_Qt Creator/vedio-player/start.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap3);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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 *wav *avi *rmvb *mkv *ts *wmv)"));//筛选重复项if(ui->listWidget->count() != -1){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()){k=1;continue;}}if(k!=1){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{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());//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::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;}if(totalTimeNum >= 60 && totalTimeNum <3600){sec = totalTimeNum%60;min = totalTimeNum/60;hour= 0;}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;}if(currentTimeNum >= 60 && currentTimeNum <3600){sec = currentTimeNum%60;min = currentTimeNum/60;hour= 0;}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 << "-zoom"; //视频居中，四周黑条，全屏播放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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap4;pixmap4.load("E:/VS2013 QT/New_Qt Creator/vedio-player/stop.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap4);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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());}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);play(ui->listWidget->currentItem()->text());QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap4;pixmap4.load("E:/VS2013 QT/New_Qt Creator/vedio-player/stop.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap4);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->startButton->setToolTip("暂停播放");ui->startButton->show();}}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);play(ui->listWidget->currentItem()->text());QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap4;pixmap4.load("E:/VS2013 QT/New_Qt Creator/vedio-player/stop.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap4);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->startButton->setToolTip("暂停播放");ui->startButton->show();}}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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap3;pixmap3.load("E:/VS2013 QT/New_Qt Creator/vedio-player/start.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap3);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap1;pixmap1.load("E:/VS2013 QT/New_Qt Creator/vedio-player/novoice.png");ui->voiceButton->setFixedSize(pixmap.width(),pixmap.height());ui->voiceButton->setIcon(pixmap1);ui->voiceButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->voiceButton->setToolTip("静音");ui->voiceButton->show();}else{this->process->write("mute 0\n"); //关闭静音QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");ui->voiceButton->setFixedSize(pixmap.width(),pixmap.height());ui->voiceButton->setIcon(pixmap);ui->voiceButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap1;pixmap1.load("E:/VS2013 QT/New_Qt Creator/vedio-player/novoice.png");ui->voiceButton->setFixedSize(pixmap.width(),pixmap.height());ui->voiceButton->setIcon(pixmap1);ui->voiceButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->voiceButton->setToolTip("静音");ui->voiceButton->show();}else{QPixmap pixmap;pixmap.load("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");ui->voiceButton->setFixedSize(pixmap.width(),pixmap.height());ui->voiceButton->setIcon(pixmap);ui->voiceButton->setIconSize(QSize(pixmap.width(),pixmap.height()));ui->voiceButton->setToolTip("音量");ui->voiceButton->show();}}void MainWindow::screenshotSlot()//截图(不能显示视频的画面){process->write("pause\n");// QPixmap snapImage = QPixmap::grabWindow(QApplication::desktop()->winId());//截取整个桌面窗口this->pixmap = QPixmap::grabWindow(ui->widget->winId());//截取依附的窗口QString filename = QFileDialog::getSaveFileName(this,tr("保存图片"),"./未命名",tr("PNG(*.png);;JPG(*.jpg);;BMP(*.bmp)"));//弹出保存图片的文件窗口if(filename!=NULL){this->pixmap.save(filename);}}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>10&&x<491)&&(y>20&&y<301)){if((event->button() == Qt::LeftButton)&&(ui->startButton->toolTip() == "开始播放")){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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap7;pixmap7.load("E:/VS2013 QT/New_Qt Creator/vedio-player/stop.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap7);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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("E:/VS2013 QT/New_Qt Creator/vedio-player/voice.png");QPixmap pixmap3;pixmap3.load("E:/VS2013 QT/New_Qt Creator/vedio-player/start.png");ui->startButton->setFixedSize(pixmap.width(),pixmap.height());ui->startButton->setIcon(pixmap3);ui->startButton->setIconSize(QSize(pixmap.width(),pixmap.height()));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}}}

这个小项目有几个不足之处，首先是截屏功能不能截取到播放的画面，我试过正常情况下QQ的截图快捷方式，也不能截取到播放的画面；还有一个功能没有实现，就是按下声音的按钮，不能实现静音， 拖动slider时，可以进行声音的调控，还有就是界面比较简陋，代码不够清晰，但是实现了相应的功能，第一次上传，希望大家见谅，也希望能和大家多多呢交流，希望有能力的可以完善一下。
参考：https://www.jianshu.com/p/2640f886bcad

全部代码在我的github,大家可以下载，希望大家给个star!
代码下载地址github： https://github.com/liangyueNi/Qt-mplayer.git