基于Qt Phonon实现的视频播放器，简单易懂，适合初学者

#include "player.h" #include <QtGui/QFileDialog> #include <QtGui/QStyle> #include <QtGui/QDesktopWidget> #include <QTime> #include <QtGui/QMessageBox> // Player::Player( QWidget * parent, Qt::WFlags f) : QDialog(parent, f) { path = QCoreApplication::applicationDirPath (); if (path.data()[path.size() - 1] != '/') path += "/"; qDebug() << "path = " << path;; setupUi(this); setWindowFlags(Qt::WindowMinimizeButtonHint); audioOutput = new Phonon::AudioOutput(Phonon::VideoCategory, this); mediaObject = new Phonon::MediaObject(this); Phonon::createPath(mediaObject, audioOutput);; videoWidget = new Phonon::VideoWidget(this); Phonon::createPath(mediaObject, videoWidget); QHBoxLayout *videoLayout = new QHBoxLayout; videoLayout->addWidget(videoWidget); videoWindow->setLayout(videoLayout); mediaObject->setTickInterval(1000); setUI(); setActions(); timeLabel->installEventFilter(this); volumeLabel->installEventFilter(this); timeLeft = false; init(); adjustWindow(); } void Player::init() { index = 0; playing = 0; stopped = false; playButton->setEnabled(false); prevButton->setEnabled(false); nextButton->setEnabled(false); stopButton->setEnabled(false); reloadButton->setEnabled(false); addButton->setEnabled(false); newLoad = true; } // adjust window position to center of the screen void Player::adjustWindow() { QDesktopWidget *desktop = QApplication::desktop(); int screenWidth, width; int screenHeight, height; int x, y; QSize windowSize; screenWidth = desktop->width(); screenHeight = desktop->height(); windowSize = size(); width = windowSize.width(); height = windowSize.height(); x = (screenWidth - width) / 2; y = (screenHeight - height) / 2; y -= 50; move (x, y); } // set player label text void Player::setLabel(QString track) { QString filename = mediaObject->currentSource().fileName(); filename = filename.right(filename.length() - filename.lastIndexOf('/') - 1); this->setWindowTitle("Player ~ "+filename); } // simulate the play button clicked void Player::autoPlay() { playButton->animateClick(10); } // get the audio source file Phonon::MediaSource Player::getAudio() { if (playing == 1) index++; if (playing == 2) index--; if ( sources.size() > 1){ if (index == 0){ prevButton->setEnabled(false); nextButton->setEnabled(true); } else if (index > 0 && index < sources.size() - 1){ prevButton->setEnabled(true); nextButton->setEnabled(true); } else if (index == sources.size() - 1){ prevButton->setEnabled(true); nextButton->setEnabled(false); } } return sources.at(index); } // actions void Player::setActions(){ connect(playButton, SIGNAL(clicked()), this, SLOT(play())); connect(stopButton, SIGNAL(clicked()), this, SLOT(stop())); connect(nextButton, SIGNAL(clicked()), this, SLOT(next())); connect(prevButton, SIGNAL(clicked()), this, SLOT(prev())); connect(loadButton, SIGNAL(clicked()), this, SLOT(load())); connect(addButton, SIGNAL(clicked()), this, SLOT(add())); connect(reloadButton, SIGNAL(clicked()), this, SLOT(reload())); connect(mediaObject, SIGNAL(finished()), this, SLOT(finished())); connect(audioOutput, SIGNAL(volumeChanged ( qreal )), this, SLOT(setVolume())); connect(mediaObject, SIGNAL(totalTimeChanged(qint64)), this, SLOT(updateTime())); connect(mediaObject, SIGNAL(tick(qint64)), this, SLOT(updateTime())); ; connect(mediaObject, SIGNAL(stateChanged(Phonon::State, Phonon::State)), this, SLOT(stateChanged(Phonon::State, Phonon::State))); connect(mediaObject, SIGNAL(metaDataChanged()), this, SLOT(updateInfo())); } // set the player UI : buttons icons and sliders void Player::setUI(){ #if 0 QColor *c = new QColor ( 238, 238, 157, 255 ); QPalette * p = new QPalette(); p->setColor(QPalette::ToolTipBase,*c); QFont *f = new QFont ( "sans", 10, -1, false ); QToolTip::setFont ( *f ); QToolTip::setPalette(*p); setWindowIcon(QIcon(path+"images/audio.png")); #endif playButton->setToolTip("Play"); stopButton->setToolTip("Stop"); nextButton->setToolTip("Skip forward"); prevButton->setToolTip("Skip backward"); loadButton->setToolTip("Load files"); reloadButton->setToolTip("Rewind"); seekSlider = new Phonon::SeekSlider(this); seekSlider->setMediaObject(mediaObject); QHBoxLayout *seekerLayout = new QHBoxLayout; seekerLayout->addWidget(seekSlider); playerFrame->setLayout(seekerLayout); volumeSlider = new Phonon::VolumeSlider(this); volumeSlider->setAudioOutput(audioOutput); volumeSlider->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum); QHBoxLayout *volumeLayout = new QHBoxLayout; volumeLayout->addWidget(volumeSlider); volumeFrame->setLayout(volumeLayout); } // play audio file void Player::play() { if (mediaObject->state() == Phonon::PlayingState) mediaObject->pause(); else if (mediaObject->state() == Phonon::PausedState || mediaObject->state() == Phonon::LoadingState || mediaObject->state() == Phonon::StoppedState) mediaObject->play(); } // show playing time (left or elapsed just click on the label to switch) void Player::updateTime() { QString sign = ""; long len = mediaObject->totalTime(); long pos = mediaObject->currentTime(); if (timeLeft == true) { pos = len -pos; sign = "-"; } QString timeString; if (pos || len) { int sec = pos/1000; int min = sec/60; int hour = min/60; int msec = pos; QTime playTime(hour%60, min%60, sec%60, msec%1000); sec = len / 1000; min = sec / 60; hour = min / 60; msec = len; QTime stopTime(hour%60, min%60, sec%60, msec%1000); QString timeFormat = "hh:mm:ss"; //if (hour > 0) //timeFormat = "hh:mm:ss"; timeString = playTime.toString(timeFormat); if (len) sign += timeString; } timeLabel->setText(sign); } // stop playing void Player::stop() { mediaObject->stop(); updateTime(); } // change the volume void Player::setVolume() { if (audioOutput->volume () == 0.0) volumeLabel->setPixmap(QPixmap::fromImage(QImage(path+"images/mute.png"))); else volumeLabel->setPixmap(QPixmap::fromImage(QImage(path+"images/volume.png"))); } // when the audio source is finished void Player::finished() { stop(); if (index < sources.size() - 1) next(); } // switch between time left or elapsed one void Player::changeSign() { timeLeft = !timeLeft; } // detect click on the time label bool Player::eventFilter(QObject *o, QEvent *e) { if (e->type() == QEvent::MouseButtonPress) { if (o == timeLabel) { changeSign(); return TRUE; } if (o == volumeLabel) { if (audioOutput->volume () == 0.0) { audioOutput->setVolume(1.0); volumeLabel->setPixmap(QPixmap::fromImage(QImage(path+"images/volume.png"))); } else { audioOutput->setVolume(0.0); volumeLabel->setPixmap(QPixmap::fromImage(QImage(path+"images/mute.png"))); } } } return QWidget::eventFilter(o, e); } // forward void Player::next() { playing = 1; mediaObject->setCurrentSource(getAudio()); play(); } // backward void Player::prev() { playing = 2; mediaObject->setCurrentSource(getAudio()); play(); } // load media files void Player::load() { sources.clear(); QStringList list = QFileDialog::getOpenFileNames(this,tr("Open one or more files"),".", tr("audios (*.mp3 *.wma *.ogg *.wave *.midi *.avi *.mpeg *.mpg *.wmv *.divx *.xvid *.mp4 *.flv *.ogv)")); if (list.size() > 0) { init(); for (int i = 0; i < list.size(); i++) { Phonon::MediaSource source(list.at(i)); sources.insert(i,source); } playButton->setEnabled(true); stopButton->setEnabled(true); reloadButton->setEnabled(true); addButton->setEnabled(true); mediaObject->setCurrentSource(getAudio()); pl