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62df768896
This so that the effect won't be turned off when there's input that the effect is muting (eg. when you use the Amplifier to temporarily mute a signal)
126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/*
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* Amplifier.cpp - A native amplifier effect plugin with sample-exact amplification
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*
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* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
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* Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - http://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "Amplifier.h"
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#include "embed.cpp"
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extern "C"
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{
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Plugin::Descriptor PLUGIN_EXPORT amplifier_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"Amplifier",
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QT_TRANSLATE_NOOP( "pluginBrowser", "A native amplifier plugin" ),
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"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
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0x0100,
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Plugin::Effect,
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new PluginPixmapLoader( "logo" ),
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NULL,
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NULL
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} ;
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}
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AmplifierEffect::AmplifierEffect( Model* parent, const Descriptor::SubPluginFeatures::Key* key ) :
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Effect( &lifier_plugin_descriptor, parent, key ),
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m_ampControls( this )
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{
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}
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AmplifierEffect::~AmplifierEffect()
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{
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}
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bool AmplifierEffect::processAudioBuffer( sampleFrame* buf, const fpp_t frames )
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{
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if( !isEnabled() || !isRunning () )
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{
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return( false );
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}
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double outSum = 0.0;
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const float d = dryLevel();
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const float w = wetLevel();
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for( fpp_t f = 0; f < frames; ++f )
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{
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// qDebug( "offset %d, value %f", f, m_ampControls.m_volumeModel.value( f ) );
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outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
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sample_t s[2] = { buf[f][0], buf[f][1] };
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// convert vol/pan values to left/right values
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const float left1 = m_ampControls.m_volumeModel.value() *
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( m_ampControls.m_panModel.value() <= 0
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? 1.0
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: 1.0 - m_ampControls.m_panModel.value( f ) / 100.0 );
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const float right1 = m_ampControls.m_volumeModel.value() *
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( m_ampControls.m_panModel.value() >= 0
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? 1.0
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: 1.0 + m_ampControls.m_panModel.value() / 100.0 );
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// first stage amplification
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s[0] *= ( left1 / 100.0 );
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s[1] *= ( right1 / 100.0 );
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// second stage amplification
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s[0] *= ( m_ampControls.m_leftModel.value() / 100.0 );
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s[1] *= ( m_ampControls.m_rightModel.value() / 100.0 );
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buf[f][0] = d * buf[f][0] + w * s[0];
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buf[f][1] = d * buf[f][1] + w * s[1];
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}
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checkGate( outSum / frames );
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return isRunning();
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}
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extern "C"
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{
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// necessary for getting instance out of shared lib
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Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
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{
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return new AmplifierEffect( parent, static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
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}
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}
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