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/*
* Amplifier.cpp - A native amplifier effect plugin with sample-exact amplification
*
* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
* Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
*
* This file is part of LMMS - https://lmms.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#include "Amplifier.h"
#include "embed.cpp"
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT amplifier_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"Amplifier",
QT_TRANSLATE_NOOP( "pluginBrowser", "A native amplifier plugin" ),
"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
0x0100,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
}
AmplifierEffect::AmplifierEffect( Model* parent, const Descriptor::SubPluginFeatures::Key* key ) :
Effect( &lifier_plugin_descriptor, parent, key ),
m_ampControls( this )
{
}
AmplifierEffect::~AmplifierEffect()
{
}
bool AmplifierEffect::processAudioBuffer( sampleFrame* buf, const fpp_t frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
double outSum = 0.0;
const float d = dryLevel();
const float w = wetLevel();
const ValueBuffer * volBuf = m_ampControls.m_volumeModel.valueBuffer();
const ValueBuffer * panBuf = m_ampControls.m_panModel.valueBuffer();
const ValueBuffer * leftBuf = m_ampControls.m_leftModel.valueBuffer();
const ValueBuffer * rightBuf = m_ampControls.m_rightModel.valueBuffer();
for( fpp_t f = 0; f < frames; ++f )
{
// qDebug( "offset %d, value %f", f, m_ampControls.m_volumeModel.value( f ) );
sample_t s[2] = { buf[f][0], buf[f][1] };
// vol knob
if( volBuf )
{
s[0] *= volBuf->value( f ) * 0.01f;
s[1] *= volBuf->value( f ) * 0.01f;
}
else
{
s[0] *= m_ampControls.m_volumeModel.value() * 0.01f;
s[1] *= m_ampControls.m_volumeModel.value() * 0.01f;
}
// convert pan values to left/right values
const float pan = panBuf
? panBuf->value( f )
: m_ampControls.m_panModel.value();
const float left1 = pan <= 0
? 1.0
: 1.0 - pan * 0.01f;
const float right1 = pan >= 0
? 1.0
: 1.0 + pan * 0.01f;
// second stage amplification
const float left2 = leftBuf
? leftBuf->value( f )
: m_ampControls.m_leftModel.value();
const float right2 = rightBuf
? rightBuf->value( f )
: m_ampControls.m_rightModel.value();
s[0] *= left1 * left2 * 0.01;
s[1] *= right1 * right2 * 0.01;
buf[f][0] = d * buf[f][0] + w * s[0];
buf[f][1] = d * buf[f][1] + w * s[1];
outSum += buf[f][0] * buf[f][0] + buf[f][1] * buf[f][1];
}
checkGate( outSum / frames );
return isRunning();
}
extern "C"
{
// necessary for getting instance out of shared lib
Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
{
return new AmplifierEffect( parent, static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
}
}
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