Split gstreamer plugin into smaller plugins providing fewer services

The gstreamer blob has been split into four plugins: audiodecoder,
camerabin, mediacapture, and mediaplayer.
Note: camerabin is still disabled because it is untested camerabin2
implementation.
A new qmake configuration use_gstreamer_camera has been introduced
and is needed for the mediacapture plugin to expose the camera
service. This configuration has been disabled by default.
Shared functionality has been moved to the internal gsttools library.

Change-Id: Ifb2604f440cfa97513d39f5d7978766c88eaec45
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/mediacapture/qgstreamercaptureserviceplugin.h

@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#ifndef QGSTREAMERCAPTURESERVICEPLUGIN_H
+#define QGSTREAMERCAPTURESERVICEPLUGIN_H
+
+#include <qmediaserviceproviderplugin.h>
+#include <QtCore/qset.h>
+#include <QtCore/QObject>
+
+QT_BEGIN_NAMESPACE
+
+class QGstreamerCaptureServicePlugin
+    : public QMediaServiceProviderPlugin
+#if defined(USE_GSTREAMER_CAMERA)
+    , public QMediaServiceSupportedDevicesInterface
+    , public QMediaServiceFeaturesInterface
+#endif
+    , public QMediaServiceSupportedFormatsInterface
+{
+    Q_OBJECT
+#if defined(USE_GSTREAMER_CAMERA)
+    Q_INTERFACES(QMediaServiceSupportedDevicesInterface)
+    Q_INTERFACES(QMediaServiceFeaturesInterface)
+#endif
+    Q_INTERFACES(QMediaServiceSupportedFormatsInterface)
+#if defined(USE_GSTREAMER_CAMERA)
+    Q_PLUGIN_METADATA(IID "org.qt-project.qt.mediaserviceproviderfactory/5.0" FILE "mediacapturecamera.json")
+#else
+    Q_PLUGIN_METADATA(IID "org.qt-project.qt.mediaserviceproviderfactory/5.0" FILE "mediacapture.json")
+#endif
+public:
+    QMediaService* create(QString const& key);
+    void release(QMediaService *service);
+
+#if defined(USE_GSTREAMER_CAMERA)
+    QMediaServiceProviderHint::Features supportedFeatures(const QByteArray &service) const;
+
+    QList<QByteArray> devices(const QByteArray &service) const;
+    QString deviceDescription(const QByteArray &service, const QByteArray &device);
+    QVariant deviceProperty(const QByteArray &service, const QByteArray &device, const QByteArray &property);
+#endif
+
+    QtMultimedia::SupportEstimate hasSupport(const QString &mimeType, const QStringList& codecs) const;
+    QStringList supportedMimeTypes() const;
+
+private:
+#if defined(USE_GSTREAMER_CAMERA)
+    void updateDevices() const;
+
+    mutable QList<QByteArray> m_cameraDevices;
+    mutable QStringList m_cameraDescriptions;
+#endif
+    void updateSupportedMimeTypes() const;
+
+    mutable QSet<QString> m_supportedMimeTypeSet; //for fast access
+};
+
+QT_END_NAMESPACE
+
+#endif // QGSTREAMERCAPTURESERVICEPLUGIN_H