doc/src/snippets/code/doc_src_phonon-api.qdoc
author Alex Gilkes <alex.gilkes@nokia.com>
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//! [0]
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PushStream::PushStream(QObject *parent)
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  : AbstractMediaStream(parent), m_timer(new QTimer(this))
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{
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  setStreamSize(getMediaStreamSize());
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  connect(m_timer, SIGNAL(timeout()), SLOT(moreData()));
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  m_timer->setInterval(0);
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}
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void PushStream::moreData()
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{
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  const QByteArray data = getMediaData();
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  if (data.isEmpty()) {
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    endOfData();
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  } else {
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    writeData(data);
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  }
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}
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void PushStream::needData()
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{
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  m_timer->start();
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  moreData();
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}
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void PushStream::enoughData()
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{
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  m_timer->stop();
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}
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//! [0]
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//! [1]
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PullStream::PullStream(QObject *parent)
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  : AbstractMediaStream(parent)
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{
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  setStreamSize(getMediaStreamSize());
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}
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void PullStream::needData()
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{
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  const QByteArray data = getMediaData();
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  if (data.isEmpty()) {
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    endOfData();
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  } else {
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    writeData(data);
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  }
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}
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//! [1]
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//! [2]
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seekStream(0);
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//! [2]
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//! [3]
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MediaObject m;
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QString fileName("/home/foo/bar.ogg");
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QUrl url("http://www.example.com/stream.mp3");
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QBuffer *someBuffer;
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m.setCurrentSource(fileName);
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m.setCurrentSource(url);
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m.setCurrentSource(someBuffer);
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m.setCurrentSource(Phonon::Cd);
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//! [3]
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//! [4]
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VideoPlayer *player = new VideoPlayer(Phonon::VideoCategory, parentWidget);
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connect(player, SIGNAL(finished()), player, SLOT(deleteLater()));
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player->play(url);
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//! [4]
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//! [5]
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audioPlayer->load(url);
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audioPlayer->play();
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//! [5]
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//! [6]
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media = new MediaObject(this);
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connect(media, SIGNAL(finished()), SLOT(slotFinished());
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media->setCurrentSource("/home/username/music/filename.ogg");
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...
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media->play();
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//! [6]
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//! [7]
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media->setCurrentSource(":/sounds/startsound.ogg");
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media->enqueue("/home/username/music/song.mp3");
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media->enqueue(":/sounds/endsound.ogg");
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//! [7]
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//! [8]
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  media->setCurrentSource(":/sounds/startsound.ogg");
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  connect(media, SIGNAL(aboutToFinish()), SLOT(enqueueNextSource()));
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}
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void enqueueNextSource()
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{
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  media->enqueue("/home/username/music/song.mp3");
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}
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//! [8]
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//! [9]
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int x = 200;
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media->setTickInterval(x);
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Q_ASSERT(x == producer->tickInterval());
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//! [9]
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//! [10]
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int x = 200;
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media->setTickInterval(x);
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Q_ASSERT(x >= producer->tickInterval() &&
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         x <= 2producer->tickInterval());
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//! [10]
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//! [11]
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  connect(media, SIGNAL(hasVideoChanged(bool)), hasVideoChanged(bool));
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  media->setCurrentSource("somevideo.avi");
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  media->hasVideo(); // returns false;
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}
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void hasVideoChanged(bool b)
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{
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  // b == true
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  media->hasVideo(); // returns true;
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}
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//! [11]
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//! [12]
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  connect(media, SIGNAL(hasVideoChanged(bool)), hasVideoChanged(bool));
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  media->setCurrentSource("somevideo.avi");
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  media->hasVideo(); // returns false;
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}
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void hasVideoChanged(bool b)
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{
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  // b == true
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  media->hasVideo(); // returns true;
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}
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//! [12]
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//! [13]
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setMetaArtist(media->metaData("ARTIST"));
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setMetaAlbum(media->metaData("ALBUM"));
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setMetaTitle(media->metaData("TITLE"));
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setMetaDate(media->metaData("DATE"));
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setMetaGenre(media->metaData("GENRE"));
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setMetaTrack(media->metaData("TRACKNUMBER"));
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setMetaComment(media->metaData("DESCRIPTION"));
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//! [13]
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//! [14]
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QUrl url("http://www.example.com/music.ogg");
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media->setCurrentSource(url);
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//! [14]
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//! [15]
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progressBar->setRange(0, 100); // this is the default
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connect(media, SIGNAL(bufferStatus(int)), progressBar, SLOT(setValue(int)));
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//! [15]
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//! [16]
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QObject::connect(BackendCapabilities::notifier(), SIGNAL(capabilitiesChanged()), ...
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//! [16]
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//! [17]
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QComboBox *cb = new QComboBox(parentWidget);
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ObjectDescriptionModel *model = new ObjectDescriptionModel(cb);
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model->setModelData(BackendCapabilities::availableAudioOutputDevices());
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cb->setModel(model);
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cb->setCurrentIndex(0); // select first entry
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//! [17]
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//! [18]
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int cbIndex = cb->currentIndex();
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AudioOutputDevice selectedDevice = model->modelData(cbIndex);
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//! [18]
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//! [19]
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Path path = Phonon::createPath(...);
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Effect *effect = new Effect(this);
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path.insertEffect(effect);
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//! [19]
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//! [20]
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MediaObject *media = new MediaObject;
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AudioOutput *output = new AudioOutput(Phonon::MusicCategory);
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Path path = Phonon::createPath(media, output);
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Q_ASSERT(path.isValid()); // for this simple case the path should always be
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                          //valid - there are unit tests to ensure it
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// insert an effect
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QList<EffectDescription> effectList = BackendCapabilities::availableAudioEffects();
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if (!effectList.isEmpty()) {
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    Effect *effect = path.insertEffect(effectList.first());
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}
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//! [20]
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//! [21]
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MediaObject *media = new MediaObject(parent);
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VideoWidget *vwidget = new VideoWidget(parent);
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Phonon::createPath(media, vwidget);
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//! [21]