mirror of
https://github.com/LMMS/lmms.git
synced 2026-01-16 02:18:10 -05:00
152 lines
3.9 KiB
C++
152 lines
3.9 KiB
C++
/*
|
|
* flangereffect.cpp - defination of FlangerEffect class.
|
|
*
|
|
* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
|
|
*
|
|
* 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 "FlangerEffect.h"
|
|
#include "Engine.h"
|
|
#include "embed.h"
|
|
|
|
extern "C"
|
|
{
|
|
|
|
Plugin::Descriptor PLUGIN_EXPORT flanger_plugin_descriptor =
|
|
{
|
|
STRINGIFY( PLUGIN_NAME ),
|
|
"Flanger",
|
|
QT_TRANSLATE_NOOP( "pluginBrowser", "A native flanger plugin" ),
|
|
"Dave French <contact/dot/dave/dot/french3/at/googlemail/dot/com>",
|
|
0x0100,
|
|
Plugin::Effect,
|
|
new PluginPixmapLoader("logo"),
|
|
NULL,
|
|
NULL
|
|
} ;
|
|
|
|
|
|
|
|
|
|
FlangerEffect::FlangerEffect( Model *parent, const Plugin::Descriptor::SubPluginFeatures::Key *key ) :
|
|
Effect( &flanger_plugin_descriptor, parent, key ),
|
|
m_flangerControls( this )
|
|
{
|
|
m_lfo = new QuadratureLfo( Engine::mixer()->processingSampleRate() );
|
|
m_lDelay = new MonoDelay( 1, Engine::mixer()->processingSampleRate() );
|
|
m_rDelay = new MonoDelay( 1, Engine::mixer()->processingSampleRate() );
|
|
m_noise = new Noise;
|
|
}
|
|
|
|
|
|
|
|
|
|
FlangerEffect::~FlangerEffect()
|
|
{
|
|
if(m_lDelay )
|
|
{
|
|
delete m_lDelay;
|
|
}
|
|
if( m_rDelay )
|
|
{
|
|
delete m_rDelay;
|
|
}
|
|
if(m_lfo )
|
|
{
|
|
delete m_lfo;
|
|
}
|
|
if(m_noise)
|
|
{
|
|
delete m_noise;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
bool FlangerEffect::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 float length = m_flangerControls.m_delayTimeModel.value() * Engine::mixer()->processingSampleRate();
|
|
const float noise = m_flangerControls.m_whiteNoiseAmountModel.value();
|
|
float amplitude = m_flangerControls.m_lfoAmountModel.value() * Engine::mixer()->processingSampleRate();
|
|
bool invertFeedback = m_flangerControls.m_invertFeedbackModel.value();
|
|
m_lfo->setFrequency( 1.0/m_flangerControls.m_lfoFrequencyModel.value() );
|
|
m_lDelay->setFeedback( m_flangerControls.m_feedbackModel.value() );
|
|
m_rDelay->setFeedback( m_flangerControls.m_feedbackModel.value() );
|
|
sample_t dryS[2];
|
|
float leftLfo;
|
|
float rightLfo;
|
|
for( fpp_t f = 0; f < frames; ++f )
|
|
{
|
|
buf[f][0] += m_noise->tick() * noise;
|
|
buf[f][1] += m_noise->tick() * noise;
|
|
dryS[0] = buf[f][0];
|
|
dryS[1] = buf[f][1];
|
|
m_lfo->tick(&leftLfo, &rightLfo);
|
|
m_lDelay->setLength( ( float )length + amplitude * (leftLfo+1.0) );
|
|
m_rDelay->setLength( ( float )length + amplitude * (rightLfo+1.0) );
|
|
if(invertFeedback)
|
|
{
|
|
m_lDelay->tick( &buf[f][1] );
|
|
m_rDelay->tick(&buf[f][0] );
|
|
} else
|
|
{
|
|
m_lDelay->tick( &buf[f][0] );
|
|
m_rDelay->tick( &buf[f][1] );
|
|
}
|
|
|
|
buf[f][0] = ( d * dryS[0] ) + ( w * buf[f][0] );
|
|
buf[f][1] = ( d * dryS[1] ) + ( w * buf[f][1] );
|
|
outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
|
|
}
|
|
checkGate( outSum / frames );
|
|
return isRunning();
|
|
}
|
|
|
|
|
|
|
|
|
|
void FlangerEffect::changeSampleRate()
|
|
{
|
|
m_lfo->setSampleRate( Engine::mixer()->processingSampleRate() );
|
|
m_lDelay->setSampleRate( Engine::mixer()->processingSampleRate() );
|
|
m_rDelay->setSampleRate( Engine::mixer()->processingSampleRate() );
|
|
}
|
|
|
|
|
|
|
|
extern "C"
|
|
{
|
|
|
|
//needed for getting plugin out of shared lib
|
|
PLUGIN_EXPORT Plugin * lmms_plugin_main( Model* parent, void* data )
|
|
{
|
|
return new FlangerEffect( parent , static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
|
|
}
|
|
|
|
}}
|