基于Qt4 phonon的多媒体播放器

/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ***************************************************************************/ #include <QtGui> #include <QtSql> #include "mainwindow.h" #include "Database.h" MainWindow::MainWindow() { readSettings(); count = 0; model = new QSqlTableModel(this); model->setTable("playlist"); model->select(); audioOutput = new Phonon::AudioOutput(Phonon::MusicCategory, this); mediaObject = new Phonon::MediaObject(this); metaInformationResolver = new Phonon::MediaObject(this); videoWidget = new VideoDisplayWidget(mediaObject,metaInformationResolver,&sources,this); mediaObject->setTickInterval(1000); connect(mediaObject, SIGNAL(tick(qint64)), this, SLOT(tick(qint64))); connect(mediaObject, SIGNAL(stateChanged(Phonon::State,Phonon::State)), this, SLOT(stateChanged(Phonon::State,Phonon::State))); connect(metaInformationResolver, SIGNAL(stateChanged(Phonon::State,Phonon::State)), this, SLOT(metaStateChanged(Phonon::State,Phonon::State))); connect(mediaObject, SIGNAL(currentSourceChanged(Phonon::MediaSource)), this, SLOT(sourceChanged(Phonon::MediaSource))); connect(mediaObject, SIGNAL(aboutToFinish()), this, SLOT(aboutToFinish())); connect(mediaObject,SIGNAL(hasVideoChanged(bool)),this,SLOT(hasVideoInMediaObject(bool))); connect(this,SIGNAL(changeMediaPlayerUI()),this,SLOT(hasVideoInMediaObject())); Phonon::createPath(mediaObject, audioOutput); Phonon::createPath(mediaObject, videoWidget); setupActions(); setupMenus(); setupUi(); timeLcd->display("00:00"); fetchDataFromDatabase(); } void MainWindow::addFiles() { QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Music Files"), QDesktopServices::storageLocation(QDesktopServices::MusicLocation)); if (files.isEmpty()) return; int index = sources.size(); foreach (QString string, files) { Phonon::MediaSource source(string); sources.append(source); } if (!sources.isEmpty()) metaInformationResolver->setCurrentSource(sources.at(index)); } void MainWindow::about() { QMessageBox::information(this, tr("About Phonen Media Player Demo"), tr("The Phonen Media Player Demo shows how to use Phonon - the multimedia" " framework that comes with Qt - to create a simple media player.")); } void MainWindow::stateChanged(Phonon::State newState, Phonon::State /* oldState */) { switch (newState) { case Phonon::ErrorState: if (mediaObject->errorType() == Phonon::FatalError) { QMessageBox::warning(this, tr("Fatal Error"), mediaObject->errorString()); } else { QMessageBox::warning(this, tr("Error"), mediaObject->errorString()); } break; case Phonon::PlayingState: playAction->setEnabled(false); pauseAction->setEnabled(true); stopAction->setEnabled(true); //the signal hasVideoChanged(bool) can not emit if the first file played is audio in video UI. //So, use this workaround to emit a signal which is for checking whether change the UI. count++; if(count < 2){ emit changeMediaPlayerUI(); } break; case Phonon::StoppedState: stopAction->setEnabled(false); playAction->setEnabled(true); pauseAction->setEnabled(false); timeLcd->display("00:00"); break; case Phonon::PausedState: pauseAction->setEnabled(false); stopAction->setEnabled(true); playAction->setEnabled(true); break; case Phonon::BufferingState: break; default: ; } } void MainWindow::tick(qint64 time) { QTime displayTime(0, (time / 60000) % 60, (time / 1000) % 60); timeLcd->display(displayTime.toString("mm:ss")); } void MainWindow::tableClicked(int row, int /* column */) { mediaObject->stop(); mediaObject->clearQueue(); if (row >= sources.size()) return; mediaObject->setCurrentSource(sources[row]); mediaObject->play(); } void MainWindow::sourceChanged(const Phonon::MediaSource &source) { musicTable->selectRow(sources.indexOf(source)); timeLcd->display("00:00"); } void MainWindow::metaStateChanged(Phonon::State newState, Phonon::State /* oldState */) { if (newState == Phonon::ErrorState) { QMessageBox::warning(this, tr("Error opening files"), metaInformationResolver->errorString()); while (!sources.isEmpty() && !(sources.takeLast() == metaInformationResolver->currentSource())) {} /* loop */; return; } if (newState != Phonon::StoppedState && newState != Phonon::PausedState) return; if (metaInformationResolver->currentSource().type() == Phonon::MediaSource::Invalid) return; QMap<QString, QString> metaData = metaInformationResolver->metaData(); QString title = metaData.value("TITLE"); QString fileName = metaInformationResolver->currentSource().fileName(); if (title == ""){ title = fileName; title.remove(0,title.lastIndexOf("/")+1); title.remove(title.lastIndexOf("."),title.size()-title.lastIndexOf(".")); } QString artist = metaData.value("ARTIST"); if (artist == ""){ artist = "Unknown"; } QString album = metaData.value("ALBUM"); if (album == ""){ album = "Unknown"; } QString year = metaData.value("DATE"); if (year == ""){ year = "Unknown"; } QTime totalTime(0, (metaInformationResolver->totalTime()/ 60000) % 60, (metaInformationResolver->totalTime()/ 1000) % 60); QString time = totalTime.toString(("mm:ss")); if (time == ""){ time = "Unknown"; } storeDataToDatabase(fileName,title,time,artist,album,year); QTableWidgetItem *t