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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 "audiooutput.h"
#include "mediaobject.h"
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace DS9
{
AudioOutput::AudioOutput(Backend *back, QObject *parent)
: BackendNode(parent), m_currentIndex(0), m_crossfadeProgress(1.),
m_device(-1), m_backend(back), m_volume(0.)
{
}
AudioOutput::~AudioOutput()
{
}
int AudioOutput::outputDevice() const
{
return m_device;
}
static const qreal log10over20 = qreal(0.1151292546497022842); // ln(10) / 20
void AudioOutput::setVolume(qreal newVolume)
{
for(int i = 0; i < FILTER_COUNT; ++i) {
ComPointer<IBasicAudio> audio(m_filters[i], IID_IBasicAudio);
if (audio) {
const qreal currentVolume = newVolume * (m_currentIndex == i ? m_crossfadeProgress : 1-m_crossfadeProgress);
const qreal newDbVolume = (qMax(0., 1.-::log(::pow(currentVolume, -log10over20)))-1.) * 10000;
audio->put_Volume(qRound(newDbVolume));
}
}
if (m_volume != newVolume) {
m_volume = newVolume;
emit volumeChanged(newVolume);
}
}
void AudioOutput::setCrossFadingProgress(short currentIndex, qreal progress)
{
m_crossfadeProgress = progress;
m_currentIndex = currentIndex;
setVolume(m_volume);
}
bool AudioOutput::setOutputDevice(const AudioOutputDevice & newDevice)
{
//stub implementation
return setOutputDevice(newDevice.index());
}
qreal AudioOutput::volume() const
{
return m_volume;
}
bool AudioOutput::setOutputDevice(int newDevice)
{
if (newDevice == m_device) {
return true;
}
//free the previous one if it was already set
for(int i = 0; i < FILTER_COUNT; ++i) {
const Filter &oldFilter = m_filters[i];
Filter newFilter = m_backend->getAudioOutputFilter(newDevice);
if (m_mediaObject && oldFilter && newFilter) {
m_mediaObject->switchFilters(i, oldFilter, newFilter);
}
m_filters[i] = newFilter;
}
m_device = newDevice;
setVolume(m_volume);
return true;
}
}
}
QT_END_NAMESPACE
#include "moc_audiooutput.cpp"
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