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/****************************************************************************
**
** 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 QtMediaServices 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 <QtMediaServices/qmetadatacontrol.h>
#include "qmediacontrol_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QMetaDataControl
\ingroup multimedia-serv
\since 4.7
\preliminary
\brief The QMetaDataControl class provides access to the meta-data of a
QMediaService's media.
If a QMediaService can provide read or write access to the meta-data of
its current media it will implement QMetaDataControl. This control
provides functions for both retrieving and setting meta-data values.
Meta-data may be addressed by the well defined keys in the
QtMediaServices::MetaData enumeration using the metaData() functions, or by
string keys using the extendedMetaData() functions.
The functionality provided by this control is exposed to application
code by the meta-data members of QMediaObject, and so meta-data access
is potentially available in any of the media object classes. Any media
service may implement QMetaDataControl.
The interface name of QMetaDataControl is \c com.nokia.Qt.QMetaDataControl/1.0 as
defined in QMetaDataControl_iid.
\sa QMediaService::control(), QMediaObject
*/
/*!
\macro QMetaDataControl_iid
\c com.nokia.Qt.QMetaDataControl/1.0
Defines the interface name of the QMetaDataControl class.
\relates QMetaDataControl
*/
/*!
Construct a QMetaDataControl with \a parent. This class is meant as a base class
for service specific meta data providers so this constructor is protected.
*/
QMetaDataControl::QMetaDataControl(QObject *parent):
QMediaControl(*new QMediaControlPrivate, parent)
{
}
/*!
Destroy the meta-data object.
*/
QMetaDataControl::~QMetaDataControl()
{
}
/*!
\fn bool QMetaDataControl::isMetaDataAvailable() const
Identifies if meta-data is available from a media service.
Returns true if the meta-data is available and false otherwise.
*/
/*!
\fn bool QMetaDataControl::isWritable() const
Identifies if a media service's meta-data can be edited.
Returns true if the meta-data is writable and false otherwise.
*/
/*!
\fn QVariant QMetaDataControl::metaData(QtMediaServices::MetaData key) const
Returns the meta-data for the given \a key.
*/
/*!
\fn void QMetaDataControl::setMetaData(QtMediaServices::MetaData key, const QVariant &value)
Sets the \a value of the meta-data element with the given \a key.
*/
/*!
\fn QMetaDataControl::availableMetaData() const
Returns a list of keys there is meta-data available for.
*/
/*!
\fn QMetaDataControl::extendedMetaData(const QString &key) const
Returns the metaData for an abitrary string \a key.
The valid selection of keys for extended meta-data is determined by the provider and the meaning
and type may differ between providers.
*/
/*!
\fn QMetaDataControl::setExtendedMetaData(const QString &key, const QVariant &value)
Change the value of the meta-data element with an abitrary string \a key to \a value.
The valid selection of keys for extended meta-data is determined by the provider and the meaning
and type may differ between providers.
*/
/*!
\fn QMetaDataControl::availableExtendedMetaData() const
Returns a list of keys there is extended meta-data available for.
*/
/*!
\fn void QMetaDataControl::metaDataChanged()
Signal the changes of meta-data.
*/
/*!
\fn void QMetaDataControl::metaDataAvailableChanged(bool available)
Signal the availability of meta-data has changed, \a available will
be true if the multimedia object has meta-data.
*/
/*!
\fn void QMetaDataControl::writableChanged(bool writable)
Signal a change in the writable status of meta-data, \a writable will be
true if meta-data elements can be added or adjusted.
*/
#include "moc_qmetadatacontrol.cpp"
QT_END_NAMESPACE
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