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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_AUDIOOUTPUT_H
#define PHONON_MMF_AUDIOOUTPUT_H
#include <phonon/audiooutputinterface.h>
namespace Phonon
{
namespace MMF
{
class Backend;
class VolumeObserver;
/**
* @short AudioOutputInterface implementation for MMF.
*
* Forwards volume commands to the VolumeObserver instance,
* which is provided by the backend when MediaNode objects are
* connected.
*
* \section volume Volume
*
* Phonon's concept on volume is from 0.0 to 1.0, and from 1< it does
* voltage multiplication. CDrmPlayerUtility goes from 1 to
* CDrmPlayerUtility::MaxVolume(). We apply some basic math to convert
* between the two.
*
* @author Frans Englich<frans.englich@nokia.com>
*/
class AudioOutput : public QObject
, public AudioOutputInterface
{
Q_OBJECT
Q_INTERFACES(Phonon::AudioOutputInterface)
public:
AudioOutput(Backend *backend, QObject *parent);
virtual qreal volume() const;
virtual void setVolume(qreal volume);
virtual int outputDevice() const;
/**
* Has no effect.
*/
virtual bool setOutputDevice(int);
/**
* Has no effect.
*/
virtual bool setOutputDevice(const Phonon::AudioOutputDevice &);
/**
* Called by backend when nodes are connected.
*/
void setVolumeObserver(VolumeObserver& observer);
Q_SIGNALS:
void volumeChanged(qreal volume);
void audioDeviceFailed();
private:
qreal m_volume;
// Not owned
VolumeObserver* m_observer;
};
}
}
#endif
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