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/* This file is part of the KDE project.
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PHONON_MMF_MEDIANODE_H
#define PHONON_MMF_MEDIANODE_H
#include <QObject>
#include <phonon/effectinterface.h>
#include "audioplayer.h"
QT_BEGIN_NAMESPACE
/**
* @file mmf_medianode.h mmf_medianode.cpp
*
* This file starts with mmf_ in order to avoid clash with Phonon's
* medianode.h. The GStreamer backend has a file named medianode.h, but it
* isn't compiled with ABLD build system, which have problems with separating
* user and system include paths.
*/
namespace Phonon
{
namespace MMF
{
class MediaObject;
/**
* @short Base class for all nodes in the MMF backend.
*
* MediaNode is the base class for all nodes created by the MMF
* backend.
*
* These nodes may be one of the following types:
*
* - MediaObject
* This represents the source of media data. It encapsulates the
* appropriate MMF client API for playing audio or video.
* - AudioOutput
* This represents the audio output device. Since the MMF client API
* does not expose the output device directly, this backend node
* simply forwards volume control commands to the MediaObject.
* - VideoWidget
* A native widget on which video will be rendered.
* - An audio effect, derived form AbstractAudioEffect
*
* Because the MMF API does not support the concept of a media filter graph,
* this class must ensure the following:
*
* - Each media graph contains at most one MediaObject instance.
* - Every non-MediaObject node holds a reference to the MediaObject. This
* allows commands to be sent through the graph to the encapsulated MMF client
* API.
*/
class MediaNode : public QObject
{
Q_OBJECT
public:
MediaNode(QObject *parent);
~MediaNode();
bool connectOutput(MediaNode *output);
bool disconnectOutput(MediaNode *output);
virtual void connectMediaObject(MediaObject *mediaObject) = 0;
virtual void disconnectMediaObject(MediaObject *mediaObject) = 0;
private:
bool isMediaObject() const;
void updateMediaObject();
void setMediaObject(MediaObject *mediaObject);
typedef QList<const MediaNode *> NodeList;
void visit(QList<MediaNode *>& visited, MediaObject*& mediaObject);
private:
MediaObject * m_mediaObject;
// All nodes except MediaObject may have an input
MediaNode * m_input;
// Only MediaObject can have more than one output
QList<MediaNode *> m_outputs;
};
}
}
QT_END_NAMESPACE
#endif
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