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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_ABSTRACTEFFECT_H
#define PHONON_MMF_ABSTRACTEFFECT_H
#include "mmf_medianode.h"
#include <QScopedPointer>
#include <AudioEffectBase.h>
#include <Phonon/EffectInterface>
#include <Phonon/EffectParameter>
#include "audioplayer.h"
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace MMF
{
/**
* @short Base class for all effects for MMF.
*
* Adhering to Phonon with MMF is cumbersome because of a number of reasons:
*
* - MMF has no concept of effect chaining. Simply, an effect is a applied
* to PlayerUtility, that's it. This means that the order of effects is
* undefined.
* - We apply an effect to a PlayerUtility, and MediaObject has that one.
* However, effects might be created before MediaObject, but nevertheless
* needs to work. We solve this by that we are aware of the whole connection
* chain, and whenever a connection happens, we walk the chain, find effects
* that aren't applied, and apply it if we have a media object.
* - There are plenty of corner cases which we don't handle and where behavior
* are undefined. For instance, graphs with more than one MediaObject.
*/
class AbstractAudioEffect : public MediaNode
, public EffectInterface
{
Q_OBJECT
Q_INTERFACES(Phonon::EffectInterface)
public:
AbstractAudioEffect(QObject *parent,
const QList<EffectParameter> ¶ms);
virtual QList<EffectParameter> parameters() const;
virtual QVariant parameterValue(const EffectParameter ¶m) const;
virtual void setParameterValue(const EffectParameter &,
const QVariant &newValue);
virtual bool disconnectMediaNode(MediaNode *target);
enum Type
{
EffectAudioEqualizer = 1,
EffectBassBoost,
EffectDistanceAttenuation,
EffectEnvironmentalReverb,
EffectListenerOrientation,
EffectLoudness,
EffectSourceOrientation,
EffectStereoWidening
};
protected:
virtual bool activateOn(CPlayerType *player) = 0;
virtual void parameterChanged(const int id,
const QVariant &value) = 0;
/**
* Part of the implementation of AbstractAudioEffect. Forwards the call to
* activateOn(), essentially.
*/
virtual bool activateOnMediaObject(MediaObject *mo);
QScopedPointer<CAudioEffect> m_effect;
private:
const QList<EffectParameter> m_params;
QHash<int, QVariant> m_values;
};
}
}
QT_END_NAMESPACE
#endif
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