<Qt>实例：视频播放器

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这段时间忙着找工作，好久没更新了，或许有点BUG，没得太多时间去精调，还请见谅，有意见请评论哦！

整个文件打包了，下载链接：http://download.csdn.net/download/wu9797/10043716

1、mplayer for windows安装和使用方法：http://blog.csdn.net/wu9797/article/details/78253548

2、mplayer for arm（已编译好，直接放在arm开发板即可使用）：http://download.csdn.net/download/wu9797/10024789

一、工程结构

二、player.pro

#-------------------------------------------------## Project created by QtCreator 2017-10-12T15:08:48# Author  : wsg# Date    :# Version : 2.0##-------------------------------------------------QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = playerTEMPLATE = appSOURCES += main.cpp\        player.cppHEADERS  += player.hFORMS    += player.uiDISTFILES += \    image/quiet -.png \    image/voice0.png \    image/voice1.png \    image/voice2.png \    image/voice3.pngRESOURCES += \    image/image.qrc

三、头文件player.h

#ifndef PLAYER_H

#define PLAYER_H

#include <QMainWindow>

#include <QTimer>

#include <QProcess>

namespace Ui {

class Player;

class Player : public QMainWindow

    Q_OBJECT

public:

    explicit Player(QWidget *parent = 0);

    ~Player();

private slots:

    void on_BackBt_clicked();

    //定时刷新时间 槽函数

    void update_time();

    void up_dtime();

    void read_data();

    void on_addBt_clicked();

    void on_delBt_clicked();

    void on_movielist_clicked(const QModelIndex &index);

    void on_pauseBt_clicked();

    void on_forwdBt_2_clicked();

    void on_novoiceButton_clicked();

    void on_backwdBt_clicked();

    void on_FullScreentoolBt_clicked();

    void on_QuitBt_clicked();

    void on_verticalSlider_valueChanged(int value);

    void voiceIcoChanged();

    void noviceIcoChanged();

    void on_horizontalSlider_sliderReleased();

    void on_horizontalSlider_sliderPressed();

    void on_verticalSlider_sliderReleased();

    void on_verticalSlider_sliderPressed();

private:

    Ui::Player *ui;

    // 时间与进程

    QTimer *mtimer;

    QTimer *dtimer;

    QProcess *mprocess;

    QString mpath;

    QString msg;

    bool playFlag;

};

#endif // PLAYER_H

四、源文件：main.cpp

#include "player.h"

#include <QApplication>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    Player w;

    w.show();

    return a.exec();

五、源文件：player.cpp

#include "player.h"

#include "ui_player.h"

#include <QDate>    // 时间与日期

#include <QTime>

#include <QFileDialog>  // 文件对话框

#include <QFileInfo>

#include <QModelIndex>

#include <QStringList>\

#include <QMessageBox>

#include <QDebug>

#define WIN_KEY // windows平台

Player::Player(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::Player)

    ui->setupUi(this);

#ifndef WIN_KEY

    // 去掉标题栏边框...

    this->setWindowFlags(this->windowFlags()|Qt::FramelessWindowHint);

#endif

    // 定时器初始化，关联信号与槽函数，启动（视频时间）

    mtimer = new QTimer();

    connect(mtimer, SIGNAL(timeout()),this, SLOT(update_time()));

    mtimer->start(1000);

    // 日期和时间的设置（日期时间栏）

    dtimer = new QTimer();

    connect(dtimer, SIGNAL(timeout()), this, SLOT(up_dtime()));

    dtimer->start(1000);

    // 定义Qt中的进程

    mprocess = new QProcess(this);

    mprocess->setProcessChannelMode(QProcess::MergedChannels);

    // 关联进程读取数据信号

    connect(mprocess, SIGNAL(readyRead()), this, SLOT(read_data()));

    connect(ui->verticalSlider, SIGNAL(valueChanged(int)), this, SLOT(voiceIcoChanged()));

    connect(ui->novoiceButton, SIGNAL(clicked(bool)), this, SLOT(noviceIcoChanged()));

    playFlag = false;   // 初始化为暂停状态

Player::~Player()

    delete ui;

void Player::voiceIcoChanged()

    unsigned int value = ui->verticalSlider->value();

    if (value == 0)

        ui->voiceIcoLb->setStyleSheet("border-image: url(:/pic/voice0.png);");

    else if (0 < value && value <= 33)

        ui->voiceIcoLb->setStyleSheet("border-image: url(:/pic/voice1.png);");

    else if (33 < value && value <= 66)

        ui->voiceIcoLb->setStyleSheet("border-image: url(:/pic/voice2.png);");

    else

         ui->voiceIcoLb->setStyleSheet("border-image: url(:/pic/voice3.png);");

void Player::noviceIcoChanged()

    if (ui->novoiceButton->isChecked() == true)

        ui->quietLb->setStyleSheet("border-image: url(:/pic/quiet.png);");

    else

        ui->quietLb->setStyleSheet("border-image: url(:/pic/noquiet.png);");

void Player::update_time()

    // 定时写获取时间命令

    mprocess->write("get_time_length\n");   // 视频总时间

    mprocess->write("get_time_pos\n");  // 视频当前时间

void Player::up_dtime()

    // 设置dateLabel和timeLabel里的内容（日期+时间）

    ui->dateLabel->setText(QDate::currentDate().toString("yyyy-MM-dd"));

    ui->timeLabel->setText(QTime::currentTime().toString("hh:mm:ss"));

// *************************** 添加视频至列表中

void Player::on_addBt_clicked()

    if (mprocess->state() == QProcess::Running) // 若视频在运行，则暂停

        //if (ui->pauseBt->text() == "||")

        if (playFlag == true)

            mprocess->write("pause\n");

            ui->pauseBt->setText("►");

            mtimer->stop(); // 播放时间暂停

            playFlag = false;

            //update();

    QString title = tr("打开视频文件");

    QString format = tr("voideo (*.mp4 *.rmvb *.mkv *.avi *.3gp *.mov)");   // 格式过滤

    QStringList fileName = QFileDialog::getOpenFileNames(this, title,"./", format);

    ui->movielist->addItems(fileName);

#ifdef CAN

    // 判断是否存在相同文件

    int row = 0;

    QListWidgetItem *item = ui->movielist->takeItem(row);

    qDebug()<<ui->movielist->count();

    for (int row = 0; row < ui->movielist->count(); row++)

        if (fileName == (QStringList)ui->movielist->item(row)->text()){}

        else

            ui->movielist->addItems(fileName);

#endif

// *************************** 删除某一项视频列表

void Player::on_delBt_clicked()

    // 获取当前行号

    int row = ui->movielist->currentRow();

    QListWidgetItem *item = ui->movielist->takeItem(row);

    delete item;

// ***************************  点击播放视频（通过Qt中的进程运行mplayer播放视频）

void Player::on_movielist_clicked(const QModelIndex &index)

    int row  = index.row(); // 当前行

    // 获取视频路径

    QString mpath = ui->movielist->item(row)->text();

    // mplayer -slave -quiet -geometry 50:50 -zoom -x 400 -y 350 /mnt/mv.wmv

    // 播放命令格式打包

    const QString filePath_lin = "/bin/mplayer";

    QString cmd_lin = QString("%1 -slave -quiet -geometry 0:0 -zoom -x %2 -y %3 %4")

                  .arg(filePath_lin)

                  .arg(QString::number(ui->playLabel->width()))   // 宽和高的长度获取

                  .arg(QString::number(ui->playLabel->height()))

                  .arg(mpath);

#ifdef WIN_KEY

    // windows下player.exe的路径 ---注意第一次使用mplayer的时候先在cmd命令行窗口运行一次，让系统配置。

    // 详细情况请访问：http://blog.csdn.net/wu9797/article/details/78253548

    const QString filePath_win = tr("cmd /k C:/MPlayer-for-windows/MPlayer/mplayer");  // 或者mplayer.exe

    QString cmd_win = QString("%1 %2 -wid %3 -slave -quiet -zoom")

                    .arg(filePath_win)

                    .arg(mpath)

                    .arg(ui->playLabel->winId());

#endif

    /* 启动进程播放 */

    // 判断进程是否在运行，

    if (mprocess->state() == QProcess::Running)

        mprocess->kill();   // 播放状态就杀死进程

        // 等待

        mprocess->waitForFinished();

    mtimer->stop();

    // 开始播放

    mprocess->start(cmd_lin);

    // 音量初始化

    mprocess->write(QString("volume %1 2\n").arg(ui->verticalSlider->value()).toUtf8());

    // 判断是否为静音状态

    if (ui->novoiceButton->isChecked() == true) // 选中状态

        mprocess->write("mute 0\n");    // 0开启静音

    // 定时器重启

    mtimer->start(1000);

    playFlag = true;

#ifdef WIN_KEY

    mprocess->start(cmd_win);

#endif

    if (ui->pauseBt->text() == "►")

        ui->pauseBt->setText("||");

// *************************** 播放与暂停  pause

void Player::on_pauseBt_clicked()

    if (playFlag == true)   // 暂停

        mprocess->write("pause\n");

        ui->pauseBt->setText("►");

        mtimer->stop(); // 播放时间暂停

        playFlag = false;

        // 禁用静音功能，除去BUG

        ui->novoiceButton->setEnabled(false);

    else

    {   //播放

        mprocess->write("pause\n");

        ui->pauseBt->setText("||");

        mtimer->start(1000);

        playFlag = true;

        // 启用静音功能

        ui->novoiceButton->setEnabled(true);

// *************************** “<” 键播放上一个视频

void Player::on_backwdBt_clicked()

    // 获取上一个视频路径

    int row = ui->movielist->currentRow();  // 当前行号

    if (row == 0)

        row = ui->movielist->count()-1; // 把row设置为最下面一个

    else

        row--;

    // 当前行设置

    ui->movielist->setCurrentRow(row);

    // 调用点击播放函数

    on_movielist_clicked(ui->movielist->currentIndex());

// *************************** “>”键播放下一个视频

void Player::on_forwdBt_2_clicked()

    // 获取下一个视频路径

    int row = ui->movielist->currentRow();  // 当前行

    if (row == ui->movielist->count()-1)

        row = 0;

    else

        row++;

    ui->movielist->setCurrentRow(row);

    // 调用点击播放函数

    on_movielist_clicked(ui->movielist->currentIndex());

// *************************** 读取视频时间数据

void Player::read_data()

    while(mprocess->canReadLine())

        // 读取时间（视频总时间）

        msg = mprocess->readLine();

        // "ANS_LENGTH=238.20\nANS_TIME_POSITION=53.9\n"

        if (msg.indexOf("ANS_LENGTH=") >= 0)

            msg.remove("ANS_LENGTH=");

            msg.remove("\n");

            // 把msg秒数转换为hh:mm:ss格式

            double all = msg.toDouble();

            int iall = (int)all;    // 得到总共秒数

            // 设置进度条最大值

            ui->horizontalSlider->setMaximum(iall);

            QTime atime(0, 0, 0);

            atime = atime.addSecs(iall);

            ui->totalTimeLabel->setText(atime.toString("hh:mm:ss"));

        // 当前视频播放时间

        if (msg.indexOf("ANS_TIME_POSITION=") >= 0)

            msg.remove("ANS_TIME_POSITION=");

            msg.remove("\n");

            // 把msg秒数转换为hh:mm:ss格式

            double pos = msg.toDouble();

            int ipos = (int)pos;    // 得到总共秒数

            // 更新进度条

            ui->horizontalSlider->setValue(ipos);

            QTime atime(0, 0, 0);

            atime = atime.addSecs(ipos);

            ui->curtTimeLabel->setText(atime.toString("hh:mm:ss"));

// *************************** 静音功能开关

void Player::on_novoiceButton_clicked()

    if (ui->novoiceButton->isChecked() == false)    // 未静音状态

        mprocess->write("mute 0\n");

        ui->quietLb->setStyleSheet("border-image: url(:/pic/quiet.png);");

    if (ui->novoiceButton->isChecked() == true)

        mprocess->write("mute 1\n");

        ui->quietLb->setStyleSheet("border-image: url(:/pic/noquiet.png);");

// *************************** 全屏

void Player::on_FullScreentoolBt_clicked()

#ifdef WIN_KEY

    mprocess->write("vo_fullscreen");

#endif

#ifndef WIN_KEY

    QTime atime(0, 0, 0);

    if (ui->FullScreentoolBt->text() == "<>")

        if (msg.indexOf("ANS_TIME_POSITION=") >= 0)

            msg.remove("ANS_TIME_POSITION=");

            msg.remove("\n");

            // 把msg秒数转换为hh:mm:ss格式

            double pos = msg.toDouble();

            int ipos = (int)pos;    // 得到总共秒数

            // 更新进度条

            ui->horizontalSlider->setValue(ipos);

            atime = atime.addSecs(ipos);

            ui->curtTimeLabel->setText(atime.toString("hh:mm:ss"));

        QString cmd = QString("/bin/mplayer -slave -quiet -geometry %4 -zoom -x %1 -y %2 %3")

                      .arg(tr("800"))   // 宽和高的长度获取

                      .arg(tr("480"))

                      .arg(mpath)

                      .arg(atime.toString("mm:ss"));

        mprocess->close();

        mprocess->kill();

        mprocess->waitForFinished();

        mprocess->start(cmd);

        ui->FullScreentoolBt->setText("><");

        update();

    else

        if (msg.indexOf("ANS_TIME_POSITION=") >= 0)

            msg.remove("ANS_TIME_POSITION=");

            msg.remove("\n");

            // 把msg秒数转换为hh:mm:ss格式

            double pos = msg.toDouble();

            int ipos = (int)pos;    // 得到总共秒数

            // 更新进度条

            ui->horizontalSlider->setValue(ipos);

            atime = atime.addSecs(ipos);

            ui->curtTimeLabel->setText(atime.toString("mm:ss"));

        QString cmd = QString("/bin/mplayer -slave -quiet -geometry %4 -zoom -x %1 -y %2 %3")

                      .arg(ui->playLabel->width())   // 宽和高的长度获取

                      .arg(ui->playLabel->height())

                      .arg(mpath)

                      .arg(atime.toString("hh:mm:ss"));

        mprocess->close();

        mprocess->kill();

        mprocess->waitForFinished();

        mprocess->start(cmd);

        ui->FullScreentoolBt->setText("<>");

        update();

#endif

void Player::on_BackBt_clicked()    // 退出

    this->close();

// ************************** 拖动滑块快进

//void Player::on_horizontalSlider_valueChanged(int value)

//{

//    mtimer->stop();

//    ui->pauseBt->setText(tr("►"));

//    const char *cmd = QString("seek %1 2\n").arg(value).toUtf8();

//    mprocess->write(cmd);

//    mtimer->start(1000);

//    ui->pauseBt->setText("||");

//}

// ************************* 结束播放

void Player::on_QuitBt_clicked()

    mprocess->write("quit");

    mprocess->close();

    update();

// ************************ 音量滑块

void Player::on_verticalSlider_valueChanged(int value)

    const char *cmd = QString("volume %1 2\n").arg(value).toUtf8();

    mprocess->write(cmd);

    if (ui->novoiceButton->isChecked() == true)

        mprocess->write("mute 0\n");

// ********************** 滑块拖动

void Player::on_horizontalSlider_sliderPressed()

    mtimer->stop();

    ui->pauseBt->setText(tr("►"));

void Player::on_horizontalSlider_sliderReleased()

    int value = ui->horizontalSlider->value();

    const char *cmd = QString("seek %1 2\n").arg(value).toUtf8();

    mprocess->write(cmd);

    mtimer->start(1000);

    ui->pauseBt->setText("||");

void Player::on_verticalSlider_sliderReleased()

    if (ui->novoiceButton->isChecked() == true)

        mprocess->write("mute 0\n");

void Player::on_verticalSlider_sliderPressed()

    if (ui->novoiceButton->isChecked() == true)

        mprocess->write("mute 0\n");

六、界面

七、运行

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