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/* This file is part of the KDE project.
Copyright (C) 2012 Digia Plc 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/>.
*/
#include "volumefadereffect.h"
#include "common.h"
#include <QtCore>
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace Gstreamer
{
VolumeFaderEffect::VolumeFaderEffect(Backend *backend, QObject *parent)
: Effect(backend, parent, AudioSource | AudioSink)
, m_fadeCurve(Phonon::VolumeFaderEffect::Fade3Decibel)
, m_fadeTimer(0)
, m_fadeDuration(0)
, m_fadeFromVolume(0)
, m_fadeToVolume(0)
{
m_effectElement = gst_element_factory_make ("volume", NULL);
if (m_effectElement)
init();
}
VolumeFaderEffect::~VolumeFaderEffect()
{
if (m_fadeTimer)
killTimer(m_fadeTimer);
}
GstElement* VolumeFaderEffect::createEffectBin()
{
GstElement *audioBin = gst_bin_new(NULL);
// We need a queue to handle tee-connections from parent node
GstElement *queue= gst_element_factory_make ("queue", NULL);
gst_bin_add(GST_BIN(audioBin), queue);
GstElement *mconv= gst_element_factory_make ("audioconvert", NULL);
gst_bin_add(GST_BIN(audioBin), mconv);
gst_bin_add(GST_BIN(audioBin), m_effectElement);
// Link src pad
GstPad *srcPad= gst_element_get_pad (m_effectElement, "src");
gst_element_add_pad (audioBin, gst_ghost_pad_new ("src", srcPad));
gst_object_unref (srcPad);
// Link sink pad
gst_element_link_many(queue, mconv, m_effectElement, (const char*)NULL);
GstPad *sinkpad = gst_element_get_pad (queue, "sink");
gst_element_add_pad (audioBin, gst_ghost_pad_new ("sink", sinkpad));
gst_object_unref (sinkpad);
return audioBin;
}
float VolumeFaderEffect::volume() const
{
gdouble val = 0.0;
if (m_effectElement)
g_object_get(G_OBJECT(m_effectElement), "volume", &val, (const char*)NULL);
return (float)val;
}
void VolumeFaderEffect::setVolume(float volume)
{
g_object_set(G_OBJECT(m_effectElement), "volume", volume, (const char*)NULL);
}
Phonon::VolumeFaderEffect::FadeCurve VolumeFaderEffect::fadeCurve() const
{
return m_fadeCurve;
}
void VolumeFaderEffect::setFadeCurve(Phonon::VolumeFaderEffect::FadeCurve fadeCurve)
{
m_fadeCurve = fadeCurve;
}
void VolumeFaderEffect::fadeTo(float targetVolume, int fadeTime)
{
m_fadeToVolume = targetVolume;
m_fadeDuration = fadeTime;
m_fadeFromVolume = volume();
m_fadeStartTime.start();
if (m_fadeTimer)
killTimer(m_fadeTimer);
m_fadeTimer = startTimer(30);
}
void VolumeFaderEffect::updateFade()
{
double currVal = 0.0;
float step = float(m_fadeStartTime.elapsed()) / float(m_fadeDuration);
if (step > 1){
step = 1;
if (m_fadeTimer) {
killTimer(m_fadeTimer);
m_fadeTimer = 0;
}
}
// This is a very loose and interpretation of the API
// But in fact when fading between arbitrary values, the decibel values make no sense
// Note : seems like we will change the API to re-use names from QTimeline for this
switch (fadeCurve()) {
case Phonon::VolumeFaderEffect::Fade3Decibel: // Slow in the beginning
currVal = step * step;
break;
case Phonon::VolumeFaderEffect::Fade6Decibel: // Linear fade
currVal = step;
break;
case Phonon::VolumeFaderEffect::Fade9Decibel: // Fast in the beginning / Linear
currVal = step * 0.5 + (1.0-(1.0-step)*(1.0-step)) * 0.5;
break;
case Phonon::VolumeFaderEffect::Fade12Decibel: // Fast in the beginning
currVal = 1.0 - (1.0-step) * (1.0-step);
break;
default:
break;
}
const double volume = (1.0 - currVal) * m_fadeFromVolume + currVal * m_fadeToVolume;
setVolume(volume);
}
bool VolumeFaderEffect::event(QEvent *event)
{
switch (event->type()){
case QEvent::Timer:
{
QTimerEvent *timerEvent = static_cast<QTimerEvent *>(event);
if (timerEvent->timerId() == m_fadeTimer)
updateFade();
break;
}
default:
break;
}
return QObject::event(event);
}
}} //namespace Phonon::Gstreamer
QT_END_NAMESPACE
#include "moc_volumefadereffect.cpp"
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