基于qt和mplayer的影音播放器
基于qt和mplayer的影音播放器
转自：http://www.cnblogs.com/ziqiuqiandao/archive/2012/11/24/2785473.html
这是一个基于qt和mplayer使用的影音播放器，代码不多，就3，4百行。
使用到的控件有QWidget、QLabel、QFrame、QPushButton、QSlider、QListWidget、QProcess和QString。
通过这几种控件的使用，可以基本了解到qt的编程风格和使用方式。
这个程序参考了网上流行的qt控制mplayer播放的多篇文章，在此感谢一下。
运行效果图如下：
qmplayer.pro：
###################################################################### # Automatically generated by qmake (2.01a) ?? ?? 18 03:06:00 2010 ###################################################################### TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . # Input HEADERS += qmplayer.h SOURCES += main.cpp qmplayer.cpp
main.cpp：
#include "qmplayer.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); QMPlayer *qmplayer = new QMPlayer; qmplayer->showFullScreen(); return app.exec(); }qmplayer.h：
#ifndef _H_QMPLAYER_ #define _H_QMPLAYER_ #includeqmplayer.cpp：class QMPlayer:public QWidget { Q_OBJECT public: void play(QString fileName); QMPlayer(QWidget *parent = 0); private slots: void next(); void prev(); void pause(); void stop(); void setSpeed(); void dataRecieve(); void addItem(); void delItem(); void current(int); void changeVolume(int); void playListItem(QListWidgetItem *); private: QLabel *playLabel; QLabel *timeLabel; QLabel *percentLabel; QLabel *voiceLabel; QLabel *volumeLabel; QFrame *ctlFrame; QPushButton *playBtn; QPushButton *stopBtn; QPushButton *prevBtn; QPushButton *nextBtn; QPushButton *speedBtn; QSlider *currentlBar; QSlider *volumeSlider; QListWidget *playList; QPushButton *addBtn; QPushButton *delBtn; QProcess *p; QString currentStr; QString currentPercent; QString totalTime; QString fileName; }; #endif /* _H_QMPLAYER_ */
#include "qmplayer.h" QMPlayer::QMPlayer(QWidget *parent) :QWidget(parent) { resize(320, 240); setWindowTitle("mplayer"); playLabel = new QLabel(this); playLabel->setGeometry(QRect(0, 0, 240, 180)); playLabel->setPixmap(QPixmap("images/mplayer.png")); ctlFrame = new QFrame(this); ctlFrame->setGeometry(QRect(15, 183, 300, 55)); ctlFrame->setFrameShape(QFrame::StyledPanel); ctlFrame->setFrameShadow(QFrame::Raised); currentlBar = new QSlider(ctlFrame); currentlBar->setGeometry(QRect(10, 0, 180, 18)); currentlBar->setOrientation(Qt::Horizontal); connect(currentlBar, SIGNAL(sliderMoved(int)), this, SLOT(current(int))); percentLabel = new QLabel(ctlFrame); percentLabel->setGeometry(QRect(195, 2, 40, 18)); timeLabel = new QLabel(ctlFrame); timeLabel->setGeometry(QRect(235, 2, 60, 18)); stopBtn = new QPushButton("stop",ctlFrame); stopBtn->setGeometry(QRect(10, 18, 40, 18)); stopBtn->setEnabled(false); connect(stopBtn, SIGNAL(clicked()), this, SLOT(stop())); prevBtn = new QPushButton("prev",ctlFrame); prevBtn->setGeometry(QRect(60, 18, 40, 18)); connect(prevBtn, SIGNAL(clicked()), this, SLOT(prev())); playBtn = new QPushButton("play",ctlFrame); playBtn->setGeometry(QRect(110, 18, 55, 18)); playBtn->setEnabled(false); connect(playBtn, SIGNAL(clicked()), this, SLOT(pause())); nextBtn = new QPushButton("next", ctlFrame); nextBtn->setGeometry(QRect(175, 18, 40, 18)); connect(nextBtn, SIGNAL(clicked()), this, SLOT(next())); speedBtn = new QPushButton("speed", ctlFrame); speedBtn->setGeometry(QRect(225, 18, 55, 18)); connect(speedBtn, SIGNAL(clicked()), this, SLOT(setSpeed())); voiceLabel = new QLabel("voice:", ctlFrame); voiceLabel->setGeometry(QRect(10, 36, 50, 18)); volumeSlider = new QSlider(ctlFrame); volumeSlider->setGeometry(QRect(70, 36, 100, 18)); volumeSlider->setOrientation(Qt::Horizontal); volumeSlider->setRange(0, 100); volumeSlider->setValue(100); volumeSlider->setEnabled(false); connect(volumeSlider, SIGNAL(sliderMoved(int)), this, SLOT(changeVolume(int))); volumeLabel = new QLabel(ctlFrame); volumeLabel->setGeometry(QRect(175, 36, 60, 18)); volumeLabel->setText(QString::number(100)); playList = new QListWidget(this); playList->setGeometry(QRect(243, 8, 73, 150)); connect(playList, SIGNAL(itemDoubleClicked(QListWidgetItem *)), this, SLOT(playListItem(QListWidgetItem *))); addBtn = new QPushButton(QIcon("images/add.png"), "", this); addBtn->setGeometry(QRect(248, 160, 30, 20)); addBtn->setStyleSheet("border-style:none"); connect(addBtn, SIGNAL(clicked()), this, SLOT(addItem())); delBtn = new QPushButton(QIcon("images/remove.png"), "", this); delBtn->setGeometry(QRect(283, 160, 30, 20)); delBtn->setStyleSheet("border-style:none"); connect(delBtn, SIGNAL(clicked()), this, SLOT(delItem())); } /************************************************* Function:next Description:play the next movie/song *************************************************/ void QMPlayer::next() { if (playList->count() != 0) { if(playList->currentRow() == playList->count() - 1) playList->setCurrentRow(0); else playList->setCurrentRow(playList->currentRow() + 1); play(playList->currentItem()->text()); playBtn->setText("pause"); } } /************************************************* Function:prev Description:play the previous movie/song *************************************************/ void QMPlayer::prev() { if (playList->count() != 0) { if(playList->currentRow() == 0) playList->setCurrentRow(playList->count() - 1); else playList->setCurrentRow(playList->currentRow() - 1); play(playList->currentItem()->text()); playBtn->setText("pause"); } } /************************************************* Function:addItem Description:add a item in the playlist *************************************************/ void QMPlayer::addItem() { QStringList fileNames = QFileDialog::getOpenFileNames(this, "choose movie/song", "/", "Movie/Song (*.mp4 *.mp3)"); if(fileNames.count() != 0) playList->addItems(fileNames); } /************************************************* Function:delItem Description:delete a item in the playlist *************************************************/ void QMPlayer::delItem() { if(playList->currentRow() == -1) QMessageBox::warning(this, "note", "not select or playList is null", QMessageBox::Yes); else playList->takeItem(playList->currentRow()); } /************************************************* Function:playListItem Description:play a item in the playlist *************************************************/ void QMPlayer::playListItem(QListWidgetItem *item) { play(item->text()); playBtn->setText("pause"); } /************************************************* Function:play Description:call mplayer to play movie/song *************************************************/ void QMPlayer::play(QString fileName) { if (p != NULL) p->kill(); p = new QProcess(this); connect(p, SIGNAL(readyReadStandardOutput()), this, SLOT(dataRecieve())); QStringList args; args << "-slave"; args << "-quiet"; args << "-zoom"; args << "-x"; args << "240"; args << "-y"; args << "180"; args << fileName; p->start("mplayer", args); playBtn->setEnabled(true); stopBtn->setEnabled(true); volumeSlider->setEnabled(true); timeLabel->show(); percentLabel->show(); } /************************************************* Function:pause Description:pause a playing movie/song *************************************************/ void QMPlayer::pause() { p->write("pause\n"); if (playBtn->text() == "play") { connect(p, SIGNAL(readyReadStandardOutput()), this, SLOT(dataRecieve())); dataRecieve(); playBtn->setText("pause"); } else { disconnect(p, SIGNAL(readyReadStandardOutput()), this, SLOT(dataRecieve())); playBtn->setText("play"); } } /************************************************* Function:stop Description:stop a playing movie/song *************************************************/ void QMPlayer::stop() { p->kill(); p = NULL; timeLabel->hide(); percentLabel->hide(); playLabel->update(); playBtn->setEnabled(false); stopBtn->setEnabled(false); volumeSlider->setEnabled(false); } /************************************************* Function:changeVolume Description:change the volume *************************************************/ void QMPlayer::changeVolume(int v) { volumeLabel->setText(QString::number(v)); p->write(QString("volume " + QString::number(v) + " 2\n").toUtf8()); } /************************************************* Function:setSpeed Description:set the playing speed *************************************************/ void QMPlayer::setSpeed() { double speed=QInputDialog::getDouble(this, "set speed", "compare with nomal speed"); if(speed > 0) p->write(QString("speed_set " + QString::number(speed) + " 2\n").toUtf8()); } /************************************************* Function:dataRecieve Description:recieve the data from mplayer *************************************************/ void QMPlayer::dataRecieve() { p->write("get_time_length\n"); p->write("get_time_pos\n"); p->write("get_percent_pos\n"); while (p->canReadLine()) { QByteArray b = p->readLine(); b.replace(QByteArray("\n"), QByteArray("")); QString s(b); if (b.startsWith("ANS_TIME_POSITION")) { currentStr = s.mid(18); timeLabel->setText(currentStr + "s"); currentlBar->setValue(s.mid(18).toFloat()); } else if (b.startsWith("ANS_LENGTH")) { totalTime = s.mid(11); currentlBar->setRange(0, s.mid(11).toFloat()); } else if(b.startsWith("ANS_PERCENT_POSITION")) { currentPercent = s.mid(21); percentLabel->setText(currentPercent + "%"); } } } /************************************************* Function:current Description:get the current process from mplayer *************************************************/ void QMPlayer::current(int value) { p->write(QString("seek " + QString::number(value) + " 2\n").toUtf8()); }