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https://github.com/LMMS/lmms.git
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a494f4b160
The decay knob didn't actually do anything before. Now it's useful
together with newly introduced attack knob. One can do much better
sidechaining now without disturbing artifacts due to too responsive
volume changes.
(cherry picked from commit 9615ceabd5)
159 lines
4.0 KiB
C++
159 lines
4.0 KiB
C++
/*
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* peak_controller_effect.cpp - PeakController effect plugin
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*
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* Copyright (c) 2008 Paul Giblock <drfaygo/at/gmail/dot/com>
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* Copyright (c) 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 "Controller.h"
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#include "song.h"
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#include "PeakController.h"
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#include "peak_controller_effect.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 peakcontrollereffect_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"Peak Controller",
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QT_TRANSLATE_NOOP( "pluginBrowser",
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"Plugin for controlling knobs with sound peaks" ),
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"Paul Giblock <drfaygo/at/gmail.com>",
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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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// We have to keep a list of all the PeakController effects so that we can save
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// an peakEffect-ID to the project. This ID is referenced in the PeakController
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// settings and is used to set the PeakControllerEffect pointer upon load
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//QVector<PeakControllerEffect *> PeakControllerEffect::s_effects;
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PeakControllerEffect::PeakControllerEffect(
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Model * _parent,
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const Descriptor::SubPluginFeatures::Key * _key ) :
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Effect( &peakcontrollereffect_plugin_descriptor, _parent, _key ),
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m_peakControls( this ),
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m_lastSample( 0 ),
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m_lastRMS( -1 ),
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m_autoController( NULL )
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{
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m_autoController = new PeakController( engine::getSong(), this );
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engine::getSong()->addController( m_autoController );
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PeakController::s_effects.append( this );
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}
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PeakControllerEffect::~PeakControllerEffect()
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{
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int idx = PeakController::s_effects.indexOf( this );
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if( idx >= 0 )
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{
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PeakController::s_effects.remove( idx );
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}
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}
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bool PeakControllerEffect::processAudioBuffer( sampleFrame * _buf,
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const fpp_t _frames )
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{
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PeakControllerEffectControls & c = m_peakControls;
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// This appears to be used for determining whether or not to continue processing
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// audio with this effect
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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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// RMS:
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double sum = 0;
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for( int i = 0; i < _frames; ++i )
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{
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sum += _buf[i][0]*_buf[i][0] + _buf[i][1]*_buf[i][1];
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}
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if( c.m_muteModel.value() )
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{
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for( int i = 0; i < _frames; ++i )
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{
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_buf[i][0] = _buf[i][1] = 0.0f;
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}
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}
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float curRMS = sqrtf( sum / _frames );
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const float origRMS = curRMS;
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if( m_lastRMS < 0 )
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{
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m_lastRMS = curRMS;
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}
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const float v = ( curRMS >= m_lastRMS ) ?
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c.m_attackModel.value() :
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c.m_decayModel.value();
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const float a = sqrtf( sqrtf( v ) );
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curRMS = (1-a)*curRMS + a*m_lastRMS;
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m_lastSample = c.m_baseModel.value() + c.m_amountModel.value()*curRMS;
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m_lastRMS = curRMS;
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// on greater buffer sizes our LP is updated less frequently, therfore
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// replay a certain number of passes so the LP state is as if it was
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// updated N times with buffer-size 1/N
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const int timeOversamp = (4*_frames) / DEFAULT_BUFFER_SIZE-1;
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for( int i = 0; i < timeOversamp; ++i )
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{
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m_lastRMS = (1-a)*origRMS + a*m_lastRMS;
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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 PeakControllerEffect( _parent,
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static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( _data ) );
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}
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}
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