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/***************************************************************************
* Copyright (C) 1999 by Johan Levin *
* *
* Copyright (C) 2011 by Ilya Kotov *
* forkotov02@hotmail.ru *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <QSettings>
#include <math.h>
#include <stdlib.h>
#include <qmmp/qmmp.h>
#include "stereoplugin.h"
StereoPlugin *StereoPlugin::m_instance = 0;
StereoPlugin::StereoPlugin() : Effect()
{
m_instance = this;
m_format = Qmmp::PCM_S16LE;
m_avg = 0;
m_ldiff = 0;
m_rdiff = 0;
m_tmp = 0;
m_mul = 2.0;
m_chan = 0;
QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
m_mul = settings.value("extra_stereo/intensity", 1.0).toDouble();
}
StereoPlugin::~StereoPlugin()
{
m_instance = 0;
}
void StereoPlugin::applyEffect(Buffer *b)
{
if(m_chan != 2)
return;
m_mutex.lock();
if(m_format == Qmmp::PCM_S16LE)
{
short *data = (short *)b->data;
for (uint i = 0; i < b->nbytes >> 1; i += 2)
{
m_avg = (data[i] + data[i + 1]) / 2;
m_ldiff = data[i] - m_avg;
m_rdiff = data[i + 1] - m_avg;
m_tmp = m_avg + m_ldiff * m_mul;
data[i] = qBound(-32768.0, m_tmp, 32767.0);
m_tmp = m_avg + m_rdiff * m_mul;
data[i + 1] = qBound(-32768.0, m_tmp, 32767.0);
}
}
else if(m_format == Qmmp::PCM_S24LE || m_format == Qmmp::PCM_S32LE)
{
int *data = (int *)b->data;
for (uint i = 0; i < b->nbytes >> 2; i += 2)
{
m_avg = (data[i] + data[i + 1]) / 2;
m_ldiff = data[i] - m_avg;
m_rdiff = data[i + 1] - m_avg;
m_tmp = m_avg + m_ldiff * m_mul;
data[i] = m_tmp;
m_tmp = m_avg + m_rdiff * m_mul;
data[i + 1] = m_tmp;
}
}
m_mutex.unlock();
}
void StereoPlugin::configure(quint32 freq, int chan, Qmmp::AudioFormat format)
{
m_chan = chan;
m_format = format;
Effect::configure(freq, chan, format);
}
void StereoPlugin::setIntensity(double level)
{
m_mutex.lock();
m_mul = level;
m_mutex.unlock();
}
StereoPlugin* StereoPlugin::instance()
{
return m_instance;
}
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