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/* This file is part of the KDE project.
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Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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This library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2.1 or 3 of the License.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "volumeeffect.h"
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#include "qbasefilter.h"
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#include "qmeminputpin.h"
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#include <QtCore/qmath.h> //for sqrt
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QT_BEGIN_NAMESPACE
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#ifndef QT_NO_PHONON_VOLUMEFADEREFFECT
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namespace Phonon
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{
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namespace DS9
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{
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/**************************************************************************
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* curve functions
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*************************************************************************/
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static qreal curveValueFadeIn3dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * sqrt(completed));
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}
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static qreal curveValueFadeOut3dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * (1.0 - sqrt(1.0 - completed)));
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}
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// in == out for a linear fade
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static qreal curveValueFade6dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * completed);
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}
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static qreal curveValueFadeIn9dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * pow(completed, 1.5));
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}
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static qreal curveValueFadeOut9dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * (1.0 - pow(1.0 - completed, 1.5)));
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}
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static qreal curveValueFadeIn12dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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return (fadeStart + fadeDiff * completed * completed);
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}
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static qreal curveValueFadeOut12dB(const qreal fadeStart, const qreal fadeDiff, const qreal completed)
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{
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const qreal x = 1.0 - completed;
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return (fadeStart + fadeDiff * (1.0 - x * x));
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}
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static const QVector<AM_MEDIA_TYPE> audioMediaType()
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{
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QVector<AM_MEDIA_TYPE> ret;
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AM_MEDIA_TYPE mt = { MEDIATYPE_Audio, MEDIASUBTYPE_PCM, 1, 0, 1, GUID_NULL, 0, 0, 0};
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ret << mt;
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return ret;
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}
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class VolumeMemInputPin : public QMemInputPin
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{
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public:
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VolumeMemInputPin(QBaseFilter *parent, const QVector<AM_MEDIA_TYPE> &mt, QPin *output) : QMemInputPin(parent, mt, true /*transform*/, output)
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{
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}
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~VolumeMemInputPin()
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{
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}
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STDMETHODIMP NotifyAllocator(IMemAllocator *alloc, BOOL b)
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{
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ALLOCATOR_PROPERTIES prop;
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HRESULT hr = alloc->GetProperties(&prop);
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if (SUCCEEDED(hr) && prop.cBuffers > 1) {
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//this allows to reduce the latency for sound
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//the problem is that too low numbers makes the whole thing fail...
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ALLOCATOR_PROPERTIES actual;
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prop.cBuffers = 1;
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alloc->SetProperties(&prop, &actual);
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}
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return QMemInputPin::NotifyAllocator(alloc, b);
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}
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};
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class VolumeMemOutputPin : public QPin
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{
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public:
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VolumeMemOutputPin(QBaseFilter *parent, const QVector<AM_MEDIA_TYPE> &mt) : QPin(parent, PINDIR_OUTPUT, mt)
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{
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}
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~VolumeMemOutputPin()
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{
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}
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};
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class VolumeEffectFilter : public QBaseFilter
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{
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public:
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VolumeEffectFilter(VolumeEffect *);
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//reimplementation
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virtual HRESULT processSample(IMediaSample *);
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private:
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void treatOneSamplePerChannel(BYTE **buffer, int sampleSize, int channelCount, int frequency);
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QMemInputPin *m_input;
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QPin *m_output;
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VolumeEffect *m_volumeEffect;
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};
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VolumeEffectFilter::VolumeEffectFilter(VolumeEffect *ve) : QBaseFilter(CLSID_NULL),
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m_volumeEffect(ve)
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{
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QVector<AM_MEDIA_TYPE> mt;
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//creating the output
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m_output = new VolumeMemOutputPin(this, mt);
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//then creating the input
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mt << audioMediaType();
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m_input = new VolumeMemInputPin(this, mt, m_output);
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}
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void VolumeEffectFilter::treatOneSamplePerChannel(BYTE **buffer, int sampleSize, int channelCount, int frequency)
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{
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float volume = m_volumeEffect->volume();
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if (m_volumeEffect->m_fading) {
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const qreal lastSample = m_volumeEffect->m_fadeDuration * frequency / 1000;
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const qreal completed = qreal(m_volumeEffect->m_fadeSamplePosition++) / lastSample;
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if (qFuzzyCompare(completed, qreal(1.))) {
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m_volumeEffect->setVolume(m_volumeEffect->m_targetVolume);
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m_volumeEffect->m_fading = false; //we end the fading effect
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} else {
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volume = m_volumeEffect->m_fadeCurveFn(m_volumeEffect->m_initialVolume,
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m_volumeEffect->m_targetVolume - m_volumeEffect->m_initialVolume,
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completed);
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}
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}
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for(int c = 0; c < channelCount; ++c) {
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switch (sampleSize)
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{
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case 2:
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{
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short *shortBuffer = reinterpret_cast<short*>(*buffer);
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*shortBuffer *= qRound(volume);
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}
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break;
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case 1:
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**buffer *= qRound(volume);
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break;
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default:
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break;
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}
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*buffer += sampleSize;
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}
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}
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HRESULT VolumeEffectFilter::processSample(IMediaSample * ms)
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{
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BYTE *buffer = 0;
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ms->GetPointer(&buffer);
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if (buffer) {
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const AM_MEDIA_TYPE &mt = m_output->connectedType();
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if (mt.formattype != FORMAT_WaveFormatEx) {
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return VFW_E_INVALIDMEDIATYPE;
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}
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WAVEFORMATEX *format = reinterpret_cast<WAVEFORMATEX*>(mt.pbFormat);
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const int channelCount = format->nChannels;
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const int sampleSize = format->wBitsPerSample / 8; //...in bytes
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const BYTE *end = buffer + ms->GetActualDataLength();
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while (buffer < end) {
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treatOneSamplePerChannel(&buffer, sampleSize, channelCount, format->nSamplesPerSec);
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}
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}
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return S_OK;
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}
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VolumeEffect::VolumeEffect(QObject *parent) : Effect(parent),
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m_volume(1), m_fadeCurve(Phonon::VolumeFaderEffect::Fade3Decibel),
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m_fading(false), m_initialVolume(0), m_targetVolume(0), m_fadeDuration(0),
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m_fadeSamplePosition(0)
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{
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//creation of the effects
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for(int i = 0; i < FILTER_COUNT; ++i) {
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VolumeEffectFilter *f = new VolumeEffectFilter(this);
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m_filters[i] = Filter(f);
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}
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}
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float VolumeEffect::volume() const
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{
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return m_volume;
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}
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void VolumeEffect::setVolume(float newVolume)
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{
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m_volume = newVolume;
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}
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Phonon::VolumeFaderEffect::FadeCurve VolumeEffect::fadeCurve() const
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{
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return m_fadeCurve;
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}
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void VolumeEffect::setFadeCurve(Phonon::VolumeFaderEffect::FadeCurve curve)
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{
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m_fadeCurve = curve;
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}
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void VolumeEffect::fadeTo(float vol, int duration)
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{
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m_fading = true; //will be set back to false when fading is finished
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m_targetVolume = vol;
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m_fadeSamplePosition = 0;
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m_initialVolume = m_volume;
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m_fadeDuration = duration;
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//in or out?
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const bool in = vol > m_volume;
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switch(m_fadeCurve)
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{
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case Phonon::VolumeFaderEffect::Fade6Decibel:
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m_fadeCurveFn = curveValueFade6dB;
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break;
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case Phonon::VolumeFaderEffect::Fade9Decibel:
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if (in) {
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m_fadeCurveFn = curveValueFadeIn9dB;
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} else {
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m_fadeCurveFn = curveValueFadeOut9dB;
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}
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break;
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case Phonon::VolumeFaderEffect::Fade12Decibel:
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if (in) {
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m_fadeCurveFn = curveValueFadeIn12dB;
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} else {
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m_fadeCurveFn = curveValueFadeOut12dB;
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}
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break;
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case Phonon::VolumeFaderEffect::Fade3Decibel:
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default:
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if (in) {
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m_fadeCurveFn = curveValueFadeIn3dB;
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} else {
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m_fadeCurveFn = curveValueFadeOut3dB;
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}
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break;
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}
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}
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}
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}
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#endif //QT_NO_PHONON_VOLUMEFADEREFFECT
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QT_END_NAMESPACE
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#include "moc_volumeeffect.cpp"
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