/*  This file is part of the KDE project.+
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+
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    Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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+
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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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+
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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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+
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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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+
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#include "volumefadereffect.h"+
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#include "common.h"+
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#include <QtCore>+
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+
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QT_BEGIN_NAMESPACE+
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+
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#ifndef QT_NO_PHONON_VOLUMEFADEREFFECT+
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namespace Phonon+
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{+
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namespace Gstreamer+
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{+
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VolumeFaderEffect::VolumeFaderEffect(Backend *backend, QObject *parent) +
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    : Effect(backend, parent, AudioSource | AudioSink)+
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    , m_fadeCurve(Phonon::VolumeFaderEffect::Fade3Decibel)+
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    , m_fadeTimer(0)+
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    , m_fadeDuration(0)+
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    , m_fadeFromVolume(0)+
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    , m_fadeToVolume(0)+
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{+
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    m_effectElement = gst_element_factory_make ("volume", NULL);+
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    if (m_effectElement)+
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        init();+
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}+
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+
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VolumeFaderEffect::~VolumeFaderEffect()+
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{+
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    if (m_fadeTimer)+
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        killTimer(m_fadeTimer);+
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}+
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+
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GstElement* VolumeFaderEffect::createEffectBin()+
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{+
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    GstElement *audioBin = gst_bin_new(NULL);+
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+
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    // We need a queue to handle tee-connections from parent node+
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    GstElement *queue= gst_element_factory_make ("queue", NULL);+
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    gst_bin_add(GST_BIN(audioBin), queue);+
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+
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    GstElement *mconv= gst_element_factory_make ("audioconvert", NULL);+
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    gst_bin_add(GST_BIN(audioBin), mconv);+
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    gst_bin_add(GST_BIN(audioBin), m_effectElement);+
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+
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    // Link src pad+
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    GstPad *srcPad= gst_element_get_pad (m_effectElement, "src");+
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    gst_element_add_pad (audioBin, gst_ghost_pad_new ("src", srcPad));+
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    gst_object_unref (srcPad);+
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+
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    // Link sink pad+
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    gst_element_link_many(queue, mconv, m_effectElement, (const char*)NULL);+
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    GstPad *sinkpad = gst_element_get_pad (queue, "sink");+
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    gst_element_add_pad (audioBin, gst_ghost_pad_new ("sink", sinkpad));+
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    gst_object_unref (sinkpad);+
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    return audioBin;+
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}+
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+
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float VolumeFaderEffect::volume() const+
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{+
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    gdouble val = 0.0;+
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    if (m_effectElement)+
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        g_object_get(G_OBJECT(m_effectElement), "volume", &val, (const char*)NULL);+
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    return (float)val;+
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}+
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+
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void VolumeFaderEffect::setVolume(float volume)+
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{+
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    g_object_set(G_OBJECT(m_effectElement), "volume", volume, (const char*)NULL);+
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}+
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+
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Phonon::VolumeFaderEffect::FadeCurve VolumeFaderEffect::fadeCurve() const+
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{+
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    return m_fadeCurve;+
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}+
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+
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void VolumeFaderEffect::setFadeCurve(Phonon::VolumeFaderEffect::FadeCurve fadeCurve)+
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{+
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    m_fadeCurve = fadeCurve;+
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}+
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+
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void VolumeFaderEffect::fadeTo(float targetVolume, int fadeTime)+
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{+
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    m_fadeToVolume = targetVolume;+
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    m_fadeDuration = fadeTime;+
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    m_fadeFromVolume = volume();+
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    m_fadeStartTime.start();+
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+
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    if (m_fadeTimer)+
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        killTimer(m_fadeTimer);+
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    m_fadeTimer = startTimer(30);+
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}+
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+
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void VolumeFaderEffect::updateFade()+
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{+
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    double currVal = 0.0;+
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    float step = float(m_fadeStartTime.elapsed()) / float(m_fadeDuration);+
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    if (step > 1){+
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        step = 1;+
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        if (m_fadeTimer) {+
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            killTimer(m_fadeTimer);+
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            m_fadeTimer = 0;+
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        }+
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    }+
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    // This is a very loose and interpretation of the API+
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    // But in fact when fading between arbitrary values, the decibel values make no sense+
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    // Note : seems like we will change the API to re-use names from QTimeline for this+
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    switch (fadeCurve()) {+
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        case Phonon::VolumeFaderEffect::Fade3Decibel: // Slow in the beginning+
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            currVal = step * step;+
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            break;+
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        case Phonon::VolumeFaderEffect::Fade6Decibel: // Linear fade+
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            currVal = step;+
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            break;+
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        case Phonon::VolumeFaderEffect::Fade9Decibel: // Fast in the beginning / Linear+
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            currVal = step * 0.5 + (1.0-(1.0-step)*(1.0-step)) * 0.5; +
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            break;+
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        case Phonon::VolumeFaderEffect::Fade12Decibel: // Fast in the beginning+
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            currVal = 1.0 - (1.0-step) * (1.0-step);  +
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            break;+
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        default:+
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            break;+
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    }+
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    const double volume = (1.0 - currVal) * m_fadeFromVolume + currVal * m_fadeToVolume;+
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    setVolume(volume);+
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}+
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+
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bool VolumeFaderEffect::event(QEvent *event)+
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{+
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    switch (event->type()){+
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        case QEvent::Timer:+
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        {+
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            QTimerEvent *timerEvent = static_cast<QTimerEvent *>(event);+
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            if (timerEvent->timerId() == m_fadeTimer)+
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                updateFade();+
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            break;+
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        }+
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        default:+
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            break;+
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    }+
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    return QObject::event(event);+
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}+
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+
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}} //namespace Phonon::Gstreamer+
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#endif //QT_NO_PHONON_VOLUMEFADEREFFECT+
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QT_END_NAMESPACE+
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+
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#include "moc_volumefadereffect.cpp"+
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