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/***************************************************************************
* Copyright (C) 2009-2015 by Ilya Kotov <forkotov02@ya.ru> *
* Copyright (C) 2009 by Sebastian Pipping <sebastian@pipping.org> *
* *
* 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 <qmmp/qmmp.h>
#include <qmmp/statehandler.h>
#include <qmmp/soundcore.h>
#include "crossfadeplugin.h"
CrossfadePlugin::CrossfadePlugin() : Effect()
{
m_buffer = nullptr;
m_buffer_at = 0;
m_buffer_size = 0;
m_core = SoundCore::instance() ;
m_handler = StateHandler::instance();
m_state = WAITING;
QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
m_overlap = settings.value("Crossfade/overlap", 6000).toLongLong();
}
CrossfadePlugin::~CrossfadePlugin()
{
if(m_buffer)
free(m_buffer);
}
void CrossfadePlugin::applyEffect(Buffer *b)
{
switch (m_state)
{
case WAITING:
if((m_core->duration() > m_overlap + 2000)
&& (m_core->duration() - m_handler->elapsed() < m_overlap + 2000))
{
StateHandler::instance()->sendNextTrackRequest();
m_state = CHECKING;
}
break;
case CHECKING:
//next source has been received and current engine will be used to play it
if(SoundCore::instance()->nextTrackAccepted())
m_state = PREPARING;
break;
case PREPARING:
if(m_core->duration() && (m_core->duration() - m_handler->elapsed() < m_overlap))
{
if(m_buffer_at + b->samples > m_buffer_size)
{
m_buffer_size = m_buffer_at + b->samples;
m_buffer = (float *)realloc(m_buffer, m_buffer_size * sizeof(float));
}
memcpy(m_buffer + m_buffer_at, b->data, b->samples * sizeof(float));
m_buffer_at += b->samples;
b->samples = 0;
}
else if(m_buffer_at > 0)
m_state = PROCESSING;
break;
case PROCESSING:
if (m_buffer_at > 0)
{
double volume = (double)m_buffer_at/m_buffer_size;
size_t samples = qMin(m_buffer_at, b->samples);
mix(b->data, m_buffer, samples, volume);
m_buffer_at -= samples;
memmove(m_buffer, m_buffer + samples, m_buffer_at * sizeof(float));
}
else
m_state = WAITING;
break;
default:
;
}
return;
}
void CrossfadePlugin::configure(quint32 freq, ChannelMap map)
{
Effect::configure(freq, map);
}
void CrossfadePlugin::mix(float *cur_buf, float *prev_buf, uint samples, double volume)
{
for (uint i = 0; i < samples; i++)
{
cur_buf[i] = cur_buf[i]*(1.0 - volume) + prev_buf[i]*volume;
cur_buf[i] = qBound(-1.0f, cur_buf[i], 1.0f);
}
}
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