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Dynamics processor, first commit
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Vesa
201
plugins/dynamics_processor/dynamics_processor.cpp
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201
plugins/dynamics_processor/dynamics_processor.cpp
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/*
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* dynamics_processor.cpp - dynamics_processor effect-plugin
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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) 2006-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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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 "dynamics_processor.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 dynamics_processor_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"Dynamics Processor",
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QT_TRANSLATE_NOOP( "pluginBrowser",
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"plugin for processing dynamics in a flexible way" ),
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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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dynProcEffect::dynProcEffect( Model * _parent,
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const Descriptor::SubPluginFeatures::Key * _key ) :
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Effect( &dynamics_processor_plugin_descriptor, _parent, _key ),
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m_dpControls( this )
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{
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currentPeak[0] = 0.0f;
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currentPeak[1] = 0.0f;
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}
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dynProcEffect::~dynProcEffect()
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{
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}
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bool dynProcEffect::processAudioBuffer( sampleFrame * _buf,
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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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// variables for effect
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int i = 0;
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float lookup;
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float frac;
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float sm_peak[2] = { 0.0f, 0.0f };
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float gain;
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double out_sum = 0.0;
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const float d = dryLevel();
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const float w = wetLevel();
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float att_tmp = ( 1.0f / ( m_dpControls.m_attackModel.value() / 1000.0f ) ) / engine::mixer()->processingSampleRate();
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float rel_tmp = ( 1.0f / ( m_dpControls.m_releaseModel.value() / 1000.0f ) ) / engine::mixer()->processingSampleRate();
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for( fpp_t f = 0; f < _frames; ++f )
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{
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sample_t s[2] = { _buf[f][0], _buf[f][1] };
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// update peak values
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for ( i=0; i <= 1; i++ )
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{
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if( qAbs( s[i] ) > currentPeak[i] )
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{
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currentPeak[i] = qMin ( currentPeak[i] + att_tmp, qAbs( s[i] ) );
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}
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else
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if( qAbs( s[i] ) < currentPeak[i] )
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{
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currentPeak[i] = qMax ( currentPeak[i] - rel_tmp, qAbs( s[i] ) );
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}
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}
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// account for stereo mode
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switch( m_dpControls.m_stereomodeModel.value() )
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{
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case dynProcControls::SM_Maximum:
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{
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sm_peak[0] = qMax( currentPeak[0], currentPeak[1] );
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sm_peak[1] = qMax( currentPeak[0], currentPeak[1] );
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break;
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}
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case dynProcControls::SM_Average:
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{
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sm_peak[0] = ( currentPeak[0] + currentPeak[1] ) / 2;
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sm_peak[1] = ( currentPeak[0] + currentPeak[1] ) / 2;
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break;
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}
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case dynProcControls::SM_Unlinked:
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{
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sm_peak[0] = currentPeak[0];
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sm_peak[1] = currentPeak[1];
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break;
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}
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}
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// apply input gain
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if( m_dpControls.m_inputModel.value() != 1.0f )
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{
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s[0] *= m_dpControls.m_inputModel.value();
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s[1] *= m_dpControls.m_inputModel.value();
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}
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// start effect
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for ( i=0; i <= 1; i++ )
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{
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lookup = sm_peak[i] * 200.0f;
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if ( lookup < 1 )
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{
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frac = lookup - truncf(lookup);
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gain = frac * m_dpControls.m_wavegraphModel.samples()[0];
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}
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else
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if ( lookup < 200 )
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{
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frac = lookup - truncf(lookup);
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gain =
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(( (1.0f-frac) * m_dpControls.m_wavegraphModel.samples()[ (int)truncf(lookup) - 1 ] ) +
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( frac * m_dpControls.m_wavegraphModel.samples()[ (int)truncf(lookup) ] ));
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}
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else
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{
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gain = m_dpControls.m_wavegraphModel.samples()[199];
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};
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s[i] = ( s[i] / sm_peak[i] ) * gain;
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}
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// apply output gain
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s[0] *= m_dpControls.m_outputModel.value();
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s[1] *= m_dpControls.m_outputModel.value();
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// mix wet/dry signals
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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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out_sum += _buf[f][0]*_buf[f][0] + _buf[f][1]*_buf[f][1];
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}
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checkGate( out_sum / _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 dynProcEffect( _parent,
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static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>(
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_data ) ) );
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}
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}
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