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Diffstat (limited to 'src/multimedia/mediaservices/base/qmediaobject.cpp')
| -rw-r--r-- | src/multimedia/mediaservices/base/qmediaobject.cpp | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/src/multimedia/mediaservices/base/qmediaobject.cpp b/src/multimedia/mediaservices/base/qmediaobject.cpp new file mode 100644 index 0000000..3d92b12 --- /dev/null +++ b/src/multimedia/mediaservices/base/qmediaobject.cpp @@ -0,0 +1,419 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtMediaservics module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtCore/qmetaobject.h> + +#include "qmediaobject_p.h" + +#include <QtMediaservices/qmediaservice.h> +#include <QtMediaservices/qmetadatacontrol.h> + + +QT_BEGIN_NAMESPACE + +void QMediaObjectPrivate::_q_notify() +{ + Q_Q(QMediaObject); + + const QMetaObject* m = q->metaObject(); + + foreach (int pi, notifyProperties) { + QMetaProperty p = m->property(pi); + p.notifySignal().invoke( + q, QGenericArgument(QMetaType::typeName(p.userType()), p.read(q).data())); + } +} + + +/*! + \class QMediaObject + \preliminary + \brief The QMediaObject class provides a common base for multimedia objects. + \since 4.7 + + \ingroup multimedia + + QMediaObject derived classes provide access to the functionality of a + QMediaService. Each media object hosts a QMediaService and uses the + QMediaControl interfaces implemented by the service to implement its + API. Most media objects when constructed will request a new + QMediaService instance from a QMediaServiceProvider, but some like + QMediaRecorder will share a service with another object. + + QMediaObject itself provides an API for accessing a media service's \l {metaData()}{meta-data} and a means of connecting other media objects, + and peripheral classes like QVideoWidget and QMediaPlaylist. + + \sa QMediaService, QMediaControl +*/ + +/*! + Destroys a media object. +*/ + +QMediaObject::~QMediaObject() +{ + delete d_ptr; +} + +/*! + Returns the service availability error state. +*/ + +QtMediaservices::AvailabilityError QMediaObject::availabilityError() const +{ + return QtMediaservices::ServiceMissingError; +} + +/*! + Returns true if the service is available for use. +*/ + +bool QMediaObject::isAvailable() const +{ + return false; +} + +/*! + Returns the media service that provides the functionality of a multimedia object. +*/ + +QMediaService* QMediaObject::service() const +{ + return d_func()->service; +} + +int QMediaObject::notifyInterval() const +{ + return d_func()->notifyTimer->interval(); +} + +void QMediaObject::setNotifyInterval(int milliSeconds) +{ + Q_D(QMediaObject); + + if (d->notifyTimer->interval() != milliSeconds) { + d->notifyTimer->setInterval(milliSeconds); + + emit notifyIntervalChanged(milliSeconds); + } +} + +/*! + \internal +*/ +void QMediaObject::bind(QObject*) +{ +} + +/*! + \internal +*/ +void QMediaObject::unbind(QObject*) +{ +} + + +/*! + Constructs a media object which uses the functionality provided by a media \a service. + + The \a parent is passed to QObject. + + This class is meant as a base class for Multimedia objects so this + constructor is protected. +*/ + +QMediaObject::QMediaObject(QObject *parent, QMediaService *service): + QObject(parent), + d_ptr(new QMediaObjectPrivate) + +{ + Q_D(QMediaObject); + + d->q_ptr = this; + + d->notifyTimer = new QTimer(this); + d->notifyTimer->setInterval(1000); + connect(d->notifyTimer, SIGNAL(timeout()), SLOT(_q_notify())); + + d->service = service; + + setupMetaData(); +} + +/*! + \internal +*/ + +QMediaObject::QMediaObject(QMediaObjectPrivate &dd, QObject *parent, + QMediaService *service): + QObject(parent), + d_ptr(&dd) +{ + Q_D(QMediaObject); + d->q_ptr = this; + + d->notifyTimer = new QTimer(this); + d->notifyTimer->setInterval(1000); + connect(d->notifyTimer, SIGNAL(timeout()), SLOT(_q_notify())); + + d->service = service; + + setupMetaData(); +} + +/*! + Watch the property \a name. The property's notify signal will be emitted + once every notifyInterval milliseconds. + + \sa notifyInterval +*/ + +void QMediaObject::addPropertyWatch(QByteArray const &name) +{ + Q_D(QMediaObject); + + const QMetaObject* m = metaObject(); + + int index = m->indexOfProperty(name.constData()); + + if (index != -1 && m->property(index).hasNotifySignal()) { + d->notifyProperties.insert(index); + + if (!d->notifyTimer->isActive()) + d->notifyTimer->start(); + } +} + +/*! + Remove property \a name from the list of properties whose changes are + regularly signaled. + + \sa notifyInterval +*/ + +void QMediaObject::removePropertyWatch(QByteArray const &name) +{ + Q_D(QMediaObject); + + int index = metaObject()->indexOfProperty(name.constData()); + + if (index != -1) { + d->notifyProperties.remove(index); + + if (d->notifyProperties.isEmpty()) + d->notifyTimer->stop(); + } +} + +/*! + \property QMediaObject::notifyInterval + + The interval at which notifiable properties will update. + + The interval is expressed in milliseconds, the default value is 1000. + + \sa addPropertyWatch(), removePropertyWatch() +*/ + +/*! + \fn void QMediaObject::notifyIntervalChanged(int milliseconds) + + Signal a change in the notify interval period to \a milliseconds. +*/ + +/*! + \property QMediaObject::metaDataAvailable + \brief whether access to a media object's meta-data is available. + + If this is true there is meta-data available, otherwise there is no meta-data available. +*/ + +bool QMediaObject::isMetaDataAvailable() const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->isMetaDataAvailable() + : false; +} + +/*! + \fn QMediaObject::metaDataAvailableChanged(bool available) + + Signals that the \a available state of a media object's meta-data has changed. +*/ + +/*! + \property QMediaObject::metaDataWritable + \brief whether a media object's meta-data is writable. + + If this is true the meta-data is writable, otherwise the meta-data is read-only. +*/ + +bool QMediaObject::isMetaDataWritable() const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->isWritable() + : false; +} + +/*! + \fn QMediaObject::metaDataWritableChanged(bool writable) + + Signals that the \a writable state of a media object's meta-data has changed. +*/ + +/*! + Returns the value associated with a meta-data \a key. +*/ +QVariant QMediaObject::metaData(QtMediaservices::MetaData key) const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->metaData(key) + : QVariant(); +} + +/*! + Sets a \a value for a meta-data \a key. +*/ +void QMediaObject::setMetaData(QtMediaservices::MetaData key, const QVariant &value) +{ + Q_D(QMediaObject); + + if (d->metaDataControl) + d->metaDataControl->setMetaData(key, value); +} + +/*! + Returns a list of keys there is meta-data available for. +*/ +QList<QtMediaservices::MetaData> QMediaObject::availableMetaData() const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->availableMetaData() + : QList<QtMediaservices::MetaData>(); +} + +/*! + \fn QMediaObject::metaDataChanged() + + Signals that a media object's meta-data has changed. +*/ + +/*! + Returns the value associated with a meta-data \a key. + + The naming and type of extended meta-data is not standardized, so the values and meaning + of keys may vary between backends. +*/ +QVariant QMediaObject::extendedMetaData(const QString &key) const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->extendedMetaData(key) + : QVariant(); +} + +/*! + Sets a \a value for a meta-data \a key. + + The naming and type of extended meta-data is not standardized, so the values and meaning + of keys may vary between backends. +*/ +void QMediaObject::setExtendedMetaData(const QString &key, const QVariant &value) +{ + Q_D(QMediaObject); + + if (d->metaDataControl) + d->metaDataControl->setExtendedMetaData(key, value); +} + +/*! + Returns a list of keys there is extended meta-data available for. +*/ +QStringList QMediaObject::availableExtendedMetaData() const +{ + Q_D(const QMediaObject); + + return d->metaDataControl + ? d->metaDataControl->availableExtendedMetaData() + : QStringList(); +} + + +void QMediaObject::setupMetaData() +{ + Q_D(QMediaObject); + + if (d->service != 0) { + d->metaDataControl = + qobject_cast<QMetaDataControl*>(d->service->control(QMetaDataControl_iid)); + + if (d->metaDataControl) { + connect(d->metaDataControl, SIGNAL(metaDataChanged()), SIGNAL(metaDataChanged())); + connect(d->metaDataControl, + SIGNAL(metaDataAvailableChanged(bool)), + SIGNAL(metaDataAvailableChanged(bool))); + connect(d->metaDataControl, + SIGNAL(writableChanged(bool)), + SIGNAL(metaDataWritableChanged(bool))); + } + } +} + +/*! + \fn QMediaObject::availabilityChanged(bool available) + + Signal emitted when the availability state has changed to \a available +*/ + + +#include "moc_qmediaobject.cpp" + +QT_END_NAMESPACE + |