/usr/include/phonon4qt5/phonon/volumefadereffect.h is in libphonon4qt5-dev 4:4.9.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /* This file is part of the KDE project
Copyright (C) 2006 Matthias Kretz <kretz@kde.org>
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 of the License, or (at your option) version 3, or any
later version accepted by the membership of KDE e.V. (or its
successor approved by the membership of KDE e.V.), Nokia Corporation
(or its successors, if any) and the KDE Free Qt Foundation, which shall
act as a proxy defined in Section 6 of version 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_VOLUMEFADEREFFECT_H
#define PHONON_VOLUMEFADEREFFECT_H
#include "phonon_export.h"
#include "effect.h"
#ifndef QT_NO_PHONON_VOLUMEFADEREFFECT
namespace Phonon
{
class VolumeFaderEffectPrivate;
/** \class VolumeFaderEffect volumefadereffect.h phonon/VolumeFaderEffect
* Audio effect to gradually fade the audio volume.
*
* This effect differs from gradually changing the output volume in that
* a dedicated effect can change the volume in the smallest possible
* steps while every other volume control will make more or less
* noticeable steps.
*
* \ingroup PhononEffects
* \author Matthias Kretz <kretz@kde.org>
* \see AudioOutput::volume
*/
class PHONON_EXPORT VolumeFaderEffect : public Effect
{
Q_OBJECT
P_DECLARE_PRIVATE(VolumeFaderEffect)
PHONON_HEIR(VolumeFaderEffect)
Q_ENUMS(FadeCurve)
/**
* This is the current volume of the output as voltage factor.
* Setting this property changes the volume immediately.
*
* 1.0 means 100%, 0.5 means 50% voltage/25% power, 0.0 means 0%
*
* \see volumeDecibel
*/
Q_PROPERTY(float volume READ volume WRITE setVolume)
/**
* This is the current volume of the output in decibel.
* Setting this property changes the volume immediately.
*
* 0 dB means no change in volume, -6dB means an attenuation of the
* voltage to 50% and an attenuation of the power to 25%, -inf dB means
* silence.
*
* \see volume
*/
Q_PROPERTY(double volumeDecibel READ volumeDecibel WRITE setVolumeDecibel)
/**
* This property holds the fade curve to be used for the fadeIn(), fadeOut()
* and fadeTo() slots.
*
* Defaults to Fade3Decibel.
*
* \see FadeCurve
*/
Q_PROPERTY(FadeCurve fadeCurve READ fadeCurve WRITE setFadeCurve)
public:
/**
* Determines the curve of the volume change.
*/
enum FadeCurve {
/**
* "Crossfade curve" / "fast" fade out
*
* Often the best fade for a crossfade, as after half of the
* time the volume reached -3dB. This means that half the
* possible power (which is proportional to the square of the
* voltage) is reached. Summed, the maximum power of two audio
* signals fading with a -3dB curve will always be equal.
*
* For fading in or out the -3dB curve is too abrupt in the end.
*
* This is the default fade curve.
*/
Fade3Decibel,
/**
* "Linear" fade out
*
* With a -6dB fade curve after half of the fading time -6dB has
* been reached. -6dB is equal to half of the voltage meaning
* that the voltage multiplier changes linearly from the start
* of the fade to the end.
*/
Fade6Decibel,
/**
* "slow" fade out
*
* After half of the fade time -9dB are reached. So the fade is
* fast in the beginning and slow in the end. This is a good
* fade for ending music.
*/
Fade9Decibel,
/**
* more extreme version of the -9dB fade
*/
Fade12Decibel
};
float volume() const;
double volumeDecibel() const;
FadeCurve fadeCurve() const;
public Q_SLOTS:
/**
* Tells the Fader to change the volume from the current volume to 100%
* in \p fadeTime milliseconds.
* Short for \c fadeTo(1.0, fadeTime).
*
* \param fadeTime the fade duration in milliseconds
*
* \see fadeTo
* \see volume
*/
void fadeIn(int fadeTime);
/**
* Tells the Fader to change the volume from the current volume to 0%
* in \p fadeTime milliseconds.
* Short for \c fadeTo(0.0, fadeTime).
*
* \param fadeTime the fade duration in milliseconds
*
* \see fadeTo
*/
void fadeOut(int fadeTime);
void setVolume(float volume);
void setVolumeDecibel(double volumeDecibel);
void setFadeCurve(FadeCurve curve);
/**
* Tells the Fader to change the volume from the current value to
* \p volume in \p fadeTime milliseconds
*
* \see fadeIn
* \see fadeOut
*/
void fadeTo(float volume, int fadeTime);
};
} //namespace Phonon
#endif //QT_NO_PHONON_VOLUMEFADEREFFECT
// vim: sw=4 ts=4 tw=80
#endif // PHONON_VOLUMEFADEREFFECT_H
|