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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_VOLUMECONTROLINTERFACE_H
#define PHONON_MMF_VOLUMECONTROLINTERFACE_H
#include <QtGlobal>
namespace Phonon
{
namespace MMF
{
/**
* Interface used by AudioOutput to pass volume control commands
* back along the audio path to the MediaObject.
*/
class VolumeControlInterface
{
public:
virtual qreal volume() const = 0;
/**
* Returns true if the volume of the underlying audio stack is
* changed as a result of this call. The return value is used
* by the AudioDevice to determine whether to emit a
* volumeChanged signal.
*/
virtual bool setVolume(qreal volume) = 0;
};
}
}
#endif
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