--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/multimedia/qmediaserviceprovider.cpp Wed Aug 25 15:49:42 2010 +0300
@@ -0,0 +1,736 @@
+/****************************************************************************
+**
+** 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 Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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/qdebug.h>
+#include <QtCore/qmap.h>
+
+#include "qmediaservice.h"
+#include "qmediaserviceprovider.h"
+#include "qmediaserviceproviderplugin.h"
+#include "qmediapluginloader_p.h"
+#include "qmediaplayer.h"
+
+QT_BEGIN_NAMESPACE
+
+class QMediaServiceProviderHintPrivate : public QSharedData
+{
+public:
+ QMediaServiceProviderHintPrivate(QMediaServiceProviderHint::Type type)
+ :type(type), features(0)
+ {
+ }
+
+ QMediaServiceProviderHintPrivate(const QMediaServiceProviderHintPrivate &other)
+ :QSharedData(other),
+ type(other.type),
+ device(other.device),
+ mimeType(other.mimeType),
+ codecs(other.codecs),
+ features(other.features)
+ {
+ }
+
+ ~QMediaServiceProviderHintPrivate()
+ {
+ }
+
+ QMediaServiceProviderHint::Type type;
+ QByteArray device;
+ QString mimeType;
+ QStringList codecs;
+ QMediaServiceProviderHint::Features features;
+};
+
+/*!
+ \class QMediaServiceProviderHint
+ \preliminary
+ \brief The QMediaServiceProviderHint class describes what is required of a QMediaService.
+
+ \ingroup multimedia
+
+ The QMediaServiceProvider class uses hints to select an appropriate media service.
+*/
+
+/*!
+ \enum QMediaServiceProviderHint::Feature
+
+ Enumerates features a media service may provide.
+
+ \value LowLatencyPlayback
+ The service is expected to play simple audio formats,
+ but playback should start without significant delay.
+ Such playback service can be used for beeps, ringtones, etc.
+
+ \value RecordingSupport
+ The service provides audio or video recording functions.
+
+ \value StreamPlayback
+ The service is capable of playing QIODevice based streams.
+*/
+
+/*!
+ \enum QMediaServiceProviderHint::Type
+
+ Enumerates the possible types of media service provider hint.
+
+ \value Null En empty hint, use the default service.
+ \value ContentType Select media service most suitable for certain content type.
+ \value Device Select media service which supports certain device.
+ \value SupportedFeatures Select media service supporting the set of optional features.
+*/
+
+
+/*!
+ Constructs an empty media service provider hint.
+*/
+QMediaServiceProviderHint::QMediaServiceProviderHint()
+ :d(new QMediaServiceProviderHintPrivate(Null))
+{
+}
+
+/*!
+ Constructs a ContentType media service provider hint.
+
+ This type of hint describes a service that is able to play content of a specific MIME \a type
+ encoded with one or more of the listed \a codecs.
+*/
+QMediaServiceProviderHint::QMediaServiceProviderHint(const QString &type, const QStringList& codecs)
+ :d(new QMediaServiceProviderHintPrivate(ContentType))
+{
+ d->mimeType = type;
+ d->codecs = codecs;
+}
+
+/*!
+ Constructs a Device media service provider hint.
+
+ This type of hint describes a media service that utilizes a specific \a device.
+*/
+QMediaServiceProviderHint::QMediaServiceProviderHint(const QByteArray &device)
+ :d(new QMediaServiceProviderHintPrivate(Device))
+{
+ d->device = device;
+}
+
+/*!
+ Constructs a SupportedFeatures media service provider hint.
+
+ This type of hint describes a service which supports a specific set of \a features.
+*/
+QMediaServiceProviderHint::QMediaServiceProviderHint(QMediaServiceProviderHint::Features features)
+ :d(new QMediaServiceProviderHintPrivate(SupportedFeatures))
+{
+ d->features = features;
+}
+
+/*!
+ Constructs a copy of the media service provider hint \a other.
+*/
+QMediaServiceProviderHint::QMediaServiceProviderHint(const QMediaServiceProviderHint &other)
+ :d(other.d)
+{
+}
+
+/*!
+ Destroys a media service provider hint.
+*/
+QMediaServiceProviderHint::~QMediaServiceProviderHint()
+{
+}
+
+/*!
+ Assigns the value \a other to a media service provider hint.
+*/
+QMediaServiceProviderHint& QMediaServiceProviderHint::operator=(const QMediaServiceProviderHint &other)
+{
+ d = other.d;
+ return *this;
+}
+
+/*!
+ Identifies if \a other is of equal value to a media service provider hint.
+
+ Returns true if the hints are equal, and false if they are not.
+*/
+bool QMediaServiceProviderHint::operator == (const QMediaServiceProviderHint &other) const
+{
+ return (d == other.d) ||
+ (d->type == other.d->type &&
+ d->device == other.d->device &&
+ d->mimeType == other.d->mimeType &&
+ d->codecs == other.d->codecs &&
+ d->features == other.d->features);
+}
+
+/*!
+ Identifies if \a other is not of equal value to a media service provider hint.
+
+ Returns true if the hints are not equal, and false if they are.
+*/
+bool QMediaServiceProviderHint::operator != (const QMediaServiceProviderHint &other) const
+{
+ return !(*this == other);
+}
+
+/*!
+ Returns true if a media service provider is null.
+*/
+bool QMediaServiceProviderHint::isNull() const
+{
+ return d->type == Null;
+}
+
+/*!
+ Returns the type of a media service provider hint.
+*/
+QMediaServiceProviderHint::Type QMediaServiceProviderHint::type() const
+{
+ return d->type;
+}
+
+/*!
+ Returns the mime type of the media a service is expected to be able play.
+*/
+QString QMediaServiceProviderHint::mimeType() const
+{
+ return d->mimeType;
+}
+
+/*!
+ Returns a list of codes a media service is expected to be able to decode.
+*/
+QStringList QMediaServiceProviderHint::codecs() const
+{
+ return d->codecs;
+}
+
+/*!
+ Returns the name of a device a media service is expected to utilize.
+*/
+QByteArray QMediaServiceProviderHint::device() const
+{
+ return d->device;
+}
+
+/*!
+ Returns a set of features a media service is expected to provide.
+*/
+QMediaServiceProviderHint::Features QMediaServiceProviderHint::features() const
+{
+ return d->features;
+}
+
+
+Q_GLOBAL_STATIC_WITH_ARGS(QMediaPluginLoader, loader,
+ (QMediaServiceProviderFactoryInterface_iid, QLatin1String("mediaservice"), Qt::CaseInsensitive))
+
+
+class QPluginServiceProvider : public QMediaServiceProvider
+{
+ QMap<QMediaService*, QMediaServiceProviderPlugin*> pluginMap;
+
+public:
+ QMediaService* requestService(const QByteArray &type, const QMediaServiceProviderHint &hint)
+ {
+ QString key(type);
+
+ QList<QMediaServiceProviderPlugin *>plugins;
+ foreach (QObject *obj, loader()->instances(key)) {
+ QMediaServiceProviderPlugin *plugin =
+ qobject_cast<QMediaServiceProviderPlugin*>(obj);
+ if (plugin)
+ plugins << plugin;
+ }
+
+ if (!plugins.isEmpty()) {
+ QMediaServiceProviderPlugin *plugin = 0;
+
+ switch (hint.type()) {
+ case QMediaServiceProviderHint::Null:
+ plugin = plugins[0];
+ //special case for media player, if low latency was not asked,
+ //prefer services not offering it, since they are likely to support
+ //more formats
+ if (type == QByteArray(Q_MEDIASERVICE_MEDIAPLAYER)) {
+ foreach (QMediaServiceProviderPlugin *currentPlugin, plugins) {
+ QMediaServiceFeaturesInterface *iface =
+ qobject_cast<QMediaServiceFeaturesInterface*>(currentPlugin);
+
+ if (!iface || !(iface->supportedFeatures(type) &
+ QMediaServiceProviderHint::LowLatencyPlayback)) {
+ plugin = currentPlugin;
+ break;
+ }
+
+ }
+ }
+ break;
+ case QMediaServiceProviderHint::SupportedFeatures:
+ plugin = plugins[0];
+ foreach (QMediaServiceProviderPlugin *currentPlugin, plugins) {
+ QMediaServiceFeaturesInterface *iface =
+ qobject_cast<QMediaServiceFeaturesInterface*>(currentPlugin);
+
+ if (iface) {
+ if ((iface->supportedFeatures(type) & hint.features()) == hint.features()) {
+ plugin = currentPlugin;
+ break;
+ }
+ }
+ }
+ break;
+ case QMediaServiceProviderHint::Device: {
+ foreach (QMediaServiceProviderPlugin *currentPlugin, plugins) {
+ QMediaServiceSupportedDevicesInterface *iface =
+ qobject_cast<QMediaServiceSupportedDevicesInterface*>(currentPlugin);
+
+ if (!iface) {
+ // the plugin may support the device,
+ // but this choice still can be overridden
+ plugin = currentPlugin;
+ } else {
+ if (iface->devices(type).contains(hint.device())) {
+ plugin = currentPlugin;
+ break;
+ }
+ }
+ }
+ }
+ break;
+ case QMediaServiceProviderHint::ContentType: {
+ QtMultimediaKit::SupportEstimate estimate = QtMultimediaKit::NotSupported;
+ foreach (QMediaServiceProviderPlugin *currentPlugin, plugins) {
+ QtMultimediaKit::SupportEstimate currentEstimate = QtMultimediaKit::MaybeSupported;
+ QMediaServiceSupportedFormatsInterface *iface =
+ qobject_cast<QMediaServiceSupportedFormatsInterface*>(currentPlugin);
+
+ if (iface)
+ currentEstimate = iface->hasSupport(hint.mimeType(), hint.codecs());
+
+ if (currentEstimate > estimate) {
+ estimate = currentEstimate;
+ plugin = currentPlugin;
+
+ if (currentEstimate == QtMultimediaKit::PreferredService)
+ break;
+ }
+ }
+ }
+ break;
+ }
+
+ if (plugin != 0) {
+ QMediaService *service = plugin->create(key);
+ if (service != 0)
+ pluginMap.insert(service, plugin);
+
+ return service;
+ }
+ }
+
+ qWarning() << "defaultServiceProvider::requestService(): no service found for -" << key;
+ return 0;
+ }
+
+ void releaseService(QMediaService *service)
+ {
+ if (service != 0) {
+ QMediaServiceProviderPlugin *plugin = pluginMap.take(service);
+
+ if (plugin != 0)
+ plugin->release(service);
+ }
+ }
+
+ QtMultimediaKit::SupportEstimate hasSupport(const QByteArray &serviceType,
+ const QString &mimeType,
+ const QStringList& codecs,
+ int flags) const
+ {
+ QList<QObject*> instances = loader()->instances(serviceType);
+
+ if (instances.isEmpty())
+ return QtMultimediaKit::NotSupported;
+
+ bool allServicesProvideInterface = true;
+ QtMultimediaKit::SupportEstimate supportEstimate = QtMultimediaKit::NotSupported;
+
+ foreach(QObject *obj, instances) {
+ QMediaServiceSupportedFormatsInterface *iface =
+ qobject_cast<QMediaServiceSupportedFormatsInterface*>(obj);
+
+
+ if (flags) {
+ QMediaServiceFeaturesInterface *iface =
+ qobject_cast<QMediaServiceFeaturesInterface*>(obj);
+
+ if (iface) {
+ QMediaServiceProviderHint::Features features = iface->supportedFeatures(serviceType);
+
+ //if low latency playback was asked, skip services known
+ //not to provide low latency playback
+ if ((flags & QMediaPlayer::LowLatency) &&
+ !(features & QMediaServiceProviderHint::LowLatencyPlayback))
+ continue;
+
+ //the same for QIODevice based streams support
+ if ((flags & QMediaPlayer::StreamPlayback) &&
+ !(features & QMediaServiceProviderHint::StreamPlayback))
+ continue;
+ }
+ }
+
+ if (iface)
+ supportEstimate = qMax(supportEstimate, iface->hasSupport(mimeType, codecs));
+ else
+ allServicesProvideInterface = false;
+ }
+
+ //don't return PreferredService
+ supportEstimate = qMin(supportEstimate, QtMultimediaKit::ProbablySupported);
+
+ //Return NotSupported only if no services are available of serviceType
+ //or all the services returned NotSupported, otherwise return at least MaybeSupported
+ if (!allServicesProvideInterface)
+ supportEstimate = qMax(QtMultimediaKit::MaybeSupported, supportEstimate);
+
+ return supportEstimate;
+ }
+
+ QStringList supportedMimeTypes(const QByteArray &serviceType, int flags) const
+ {
+ QList<QObject*> instances = loader()->instances(serviceType);
+
+ QStringList supportedTypes;
+
+ foreach(QObject *obj, instances) {
+ QMediaServiceSupportedFormatsInterface *iface =
+ qobject_cast<QMediaServiceSupportedFormatsInterface*>(obj);
+
+
+ if (flags & QMediaPlayer::LowLatency) {
+ QMediaServiceFeaturesInterface *iface =
+ qobject_cast<QMediaServiceFeaturesInterface*>(obj);
+
+ if (iface) {
+ QMediaServiceProviderHint::Features features = iface->supportedFeatures(serviceType);
+
+ // If low latency playback was asked for, skip MIME types from services known
+ // not to provide low latency playback
+ if ((flags & QMediaPlayer::LowLatency) &&
+ !(features & QMediaServiceProviderHint::LowLatencyPlayback))
+ continue;
+
+ //the same for QIODevice based streams support
+ if ((flags & QMediaPlayer::StreamPlayback) &&
+ !(features & QMediaServiceProviderHint::StreamPlayback))
+ continue;
+ }
+ }
+
+ if (iface) {
+ supportedTypes << iface->supportedMimeTypes();
+ }
+ }
+
+ // Multiple services may support the same MIME type
+ supportedTypes.removeDuplicates();
+
+ return supportedTypes;
+ }
+
+ QList<QByteArray> devices(const QByteArray &serviceType) const
+ {
+ QList<QByteArray> res;
+
+ foreach(QObject *obj, loader()->instances(serviceType)) {
+ QMediaServiceSupportedDevicesInterface *iface =
+ qobject_cast<QMediaServiceSupportedDevicesInterface*>(obj);
+
+ if (iface) {
+ res.append(iface->devices(serviceType));
+ }
+ }
+
+ return res;
+ }
+
+ QString deviceDescription(const QByteArray &serviceType, const QByteArray &device)
+ {
+ foreach(QObject *obj, loader()->instances(serviceType)) {
+ QMediaServiceSupportedDevicesInterface *iface =
+ qobject_cast<QMediaServiceSupportedDevicesInterface*>(obj);
+
+ if (iface) {
+ if (iface->devices(serviceType).contains(device))
+ return iface->deviceDescription(serviceType, device);
+ }
+ }
+
+ return QString();
+ }
+};
+
+Q_GLOBAL_STATIC(QPluginServiceProvider, pluginProvider);
+
+/*!
+ \class QMediaServiceProvider
+ \preliminary
+ \brief The QMediaServiceProvider class provides an abstract allocator for media services.
+*/
+
+/*!
+ \fn QMediaServiceProvider::requestService(const QByteArray &type, const QMediaServiceProviderHint &hint)
+
+ Requests an instance of a \a type service which best matches the given \a
+ hint.
+
+ Returns a pointer to the requested service, or a null pointer if there is
+ no suitable service.
+
+ The returned service must be released with releaseService when it is
+ finished with.
+*/
+
+/*!
+ \fn QMediaServiceProvider::releaseService(QMediaService *service)
+
+ Releases a media \a service requested with requestService().
+*/
+
+/*!
+ \fn QtMultimediaKit::SupportEstimate QMediaServiceProvider::hasSupport(const QByteArray &serviceType, const QString &mimeType, const QStringList& codecs, int flags) const
+
+ Returns how confident a media service provider is that is can provide a \a
+ serviceType service that is able to play media of a specific \a mimeType
+ that is encoded using the listed \a codecs while adhering to constraints
+ identified in \a flags.
+*/
+QtMultimediaKit::SupportEstimate QMediaServiceProvider::hasSupport(const QByteArray &serviceType,
+ const QString &mimeType,
+ const QStringList& codecs,
+ int flags) const
+{
+ Q_UNUSED(serviceType);
+ Q_UNUSED(mimeType);
+ Q_UNUSED(codecs);
+ Q_UNUSED(flags);
+
+ return QtMultimediaKit::MaybeSupported;
+}
+
+/*!
+ \fn QStringList QMediaServiceProvider::supportedMimeTypes(const QByteArray &serviceType, int flags) const
+
+ Returns a list of MIME types supported by the service provider for the
+ specified \a serviceType.
+
+ The resultant list is restricted to MIME types which can be supported given
+ the constraints in \a flags.
+*/
+QStringList QMediaServiceProvider::supportedMimeTypes(const QByteArray &serviceType, int flags) const
+{
+ Q_UNUSED(serviceType);
+ Q_UNUSED(flags);
+
+ return QStringList();
+}
+
+/*!
+ Returns the list of devices related to \a service type.
+*/
+QList<QByteArray> QMediaServiceProvider::devices(const QByteArray &service) const
+{
+ Q_UNUSED(service);
+ return QList<QByteArray>();
+}
+
+/*!
+ Returns the description of \a device related to \a serviceType, suitable for use by
+ an application for display.
+*/
+QString QMediaServiceProvider::deviceDescription(const QByteArray &serviceType, const QByteArray &device)
+{
+ Q_UNUSED(serviceType);
+ Q_UNUSED(device);
+ return QString();
+}
+
+
+#ifdef QT_BUILD_INTERNAL
+
+static QMediaServiceProvider *qt_defaultMediaServiceProvider = 0;
+
+/*!
+ Sets a media service \a provider as the default.
+
+ \internal
+*/
+void QMediaServiceProvider::setDefaultServiceProvider(QMediaServiceProvider *provider)
+{
+ qt_defaultMediaServiceProvider = provider;
+}
+
+#endif
+
+/*!
+ Returns a default provider of media services.
+*/
+QMediaServiceProvider *QMediaServiceProvider::defaultServiceProvider()
+{
+#ifdef QT_BUILD_INTERNAL
+ return qt_defaultMediaServiceProvider != 0
+ ? qt_defaultMediaServiceProvider
+ : static_cast<QMediaServiceProvider *>(pluginProvider());
+#else
+ return pluginProvider();
+#endif
+}
+
+/*!
+ \class QMediaServiceProviderPlugin
+ \preliminary
+ \brief The QMediaServiceProviderPlugin class interface provides an interface for QMediaService
+ plug-ins.
+
+ A media service provider plug-in may implement one or more of
+ QMediaServiceSupportedFormatsInterface,
+ QMediaServiceSupportedDevicesInterface, and QMediaServiceFeaturesInterface
+ to identify the features it supports.
+*/
+
+/*!
+ \fn QMediaServiceProviderPlugin::keys() const
+
+ Returns a list of keys for media services a plug-in can create.
+*/
+
+/*!
+ \fn QMediaServiceProviderPlugin::create(const QString &key)
+
+ Constructs a new instance of the QMediaService identified by \a key.
+
+ The QMediaService returned must be destroyed with release().
+*/
+
+/*!
+ \fn QMediaServiceProviderPlugin::release(QMediaService *service)
+
+ Destroys a media \a service constructed with create().
+*/
+
+
+/*!
+ \class QMediaServiceSupportedFormatsInterface
+ \brief The QMediaServiceSupportedFormatsInterface class interface
+ identifies if a media service plug-in supports a media format.
+
+ A QMediaServiceProviderPlugin may implement this interface.
+*/
+
+/*!
+ \fn QMediaServiceSupportedFormatsInterface::~QMediaServiceSupportedFormatsInterface()
+
+ Destroys a media service supported formats interface.
+*/
+
+/*!
+ \fn QMediaServiceSupportedFormatsInterface::hasSupport(const QString &mimeType, const QStringList& codecs) const
+
+ Returns the level of support a media service plug-in has for a \a mimeType
+ and set of \a codecs.
+*/
+
+/*!
+ \fn QMediaServiceSupportedFormatsInterface::supportedMimeTypes() const
+
+ Returns a list of MIME types supported by the media service plug-in.
+*/
+
+/*!
+ \class QMediaServiceSupportedDevicesInterface
+ \brief The QMediaServiceSupportedDevicesInterface class interface
+ identifies the devices supported by a media service plug-in.
+
+ A QMediaServiceProviderPlugin may implement this interface.
+*/
+
+/*!
+ \fn QMediaServiceSupportedDevicesInterface::~QMediaServiceSupportedDevicesInterface()
+
+ Destroys a media service supported devices interface.
+*/
+
+/*!
+ \fn QMediaServiceSupportedDevicesInterface::devices(const QByteArray &service) const
+
+ Returns a list of devices supported by a plug-in \a service.
+*/
+
+/*!
+ \fn QMediaServiceSupportedDevicesInterface::deviceDescription(const QByteArray &service, const QByteArray &device)
+
+ Returns a description of a \a device supported by a plug-in \a service.
+*/
+
+/*!
+ \class QMediaServiceFeaturesInterface
+ \brief The QMediaServiceFeaturesInterface class interface identifies
+ features supported by a media service plug-in.
+
+ A QMediaServiceProviderPlugin may implement this interface.
+*/
+
+/*!
+ \fn QMediaServiceFeaturesInterface::~QMediaServiceFeaturesInterface()
+
+ Destroys a media service features interface.
+*/
+/*!
+ \fn QMediaServiceFeaturesInterface::supportedFeatures(const QByteArray &service) const
+
+ Returns a set of features supported by a plug-in \a service.
+*/
+
+#include "moc_qmediaserviceprovider.cpp"
+#include "moc_qmediaserviceproviderplugin.cpp"
+QT_END_NAMESPACE
+