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/*
* delayeffect.cpp - definition of the DelayEffect class. The Delay Plugin
*
* 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 "DelayEffect.h"
#include "Engine.h"
#include "embed.cpp"
#include "interpolation.h"
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT delay_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"Delay",
QT_TRANSLATE_NOOP( "pluginBrowser", "A native delay plugin" ),
"Dave French <contact/dot/dave/dot/french3/at/googlemail/dot/com>",
0x0100,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
DelayEffect::DelayEffect( Model* parent, const Plugin::Descriptor::SubPluginFeatures::Key* key ) :
Effect( &delay_plugin_descriptor, parent, key ),
m_delayControls( this )
{
m_delay = 0;
m_delay = new StereoDelay( 20, Engine::mixer()->processingSampleRate() );
m_lfo = new Lfo( Engine::mixer()->processingSampleRate() );
m_outGain = 1.0;
}
DelayEffect::~DelayEffect()
{
if( m_delay )
{
delete m_delay;
}
if( m_lfo )
{
delete m_lfo;
}
}
bool DelayEffect::processAudioBuffer( sampleFrame* buf, const fpp_t frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
double outSum = 0.0;
const float sr = Engine::mixer()->processingSampleRate();
const float d = dryLevel();
const float w = wetLevel();
sample_t dryS[2];
float lPeak = 0.0;
float rPeak = 0.0;
float length = m_delayControls.m_delayTimeModel.value();
float amplitude = m_delayControls.m_lfoAmountModel.value() * sr;
float lfoTime = 1.0 / m_delayControls.m_lfoTimeModel.value();
float feedback = m_delayControls.m_feedbackModel.value();
ValueBuffer *lengthBuffer = m_delayControls.m_delayTimeModel.valueBuffer();
ValueBuffer *feedbackBuffer = m_delayControls.m_feedbackModel.valueBuffer();
ValueBuffer *lfoTimeBuffer = m_delayControls.m_lfoTimeModel.valueBuffer();
ValueBuffer *lfoAmountBuffer = m_delayControls.m_lfoAmountModel.valueBuffer();
int lengthInc = lengthBuffer ? 1 : 0;
int amplitudeInc = lfoAmountBuffer ? 1 : 0;
int lfoTimeInc = lfoTimeBuffer ? 1 : 0;
int feedbackInc = feedbackBuffer ? 1 : 0;
float *lengthPtr = lengthBuffer ? &( lengthBuffer->values()[ 0 ] ) : &length;
float *amplitudePtr = lfoAmountBuffer ? &( lfoAmountBuffer->values()[ 0 ] ) : &litude;
float *lfoTimePtr = lfoTimeBuffer ? &( lfoTimeBuffer->values()[ 0 ] ) : &lfoTime;
float *feedbackPtr = feedbackBuffer ? &( feedbackBuffer->values()[ 0 ] ) : &feedback;
if( m_delayControls.m_outGainModel.isValueChanged() )
{
m_outGain = dbfsToAmp( m_delayControls.m_outGainModel.value() );
}
int sampleLength;
for( fpp_t f = 0; f < frames; ++f )
{
dryS[0] = buf[f][0];
dryS[1] = buf[f][1];
m_delay->setFeedback( *feedbackPtr );
m_lfo->setFrequency( *lfoTimePtr );
sampleLength = *lengthPtr * Engine::mixer()->processingSampleRate();
m_currentLength = sampleLength;
m_delay->setLength( m_currentLength + ( *amplitudePtr * ( float )m_lfo->tick() ) );
m_delay->tick( buf[f] );
buf[f][0] *= m_outGain;
buf[f][1] *= m_outGain;
lPeak = buf[f][0] > lPeak ? buf[f][0] : lPeak;
rPeak = buf[f][1] > rPeak ? buf[f][1] : rPeak;
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];
lengthPtr += lengthInc;
amplitudePtr += amplitudeInc;
lfoTimePtr += lfoTimeInc;
feedbackPtr += feedbackInc;
}
checkGate( outSum / frames );
m_delayControls.m_outPeakL = lPeak;
m_delayControls.m_outPeakR = rPeak;
return isRunning();
}
void DelayEffect::changeSampleRate()
{
m_lfo->setSampleRate( Engine::mixer()->processingSampleRate() );
m_delay->setSampleRate( Engine::mixer()->processingSampleRate() );
}
extern "C"
{
//needed for getting plugin out of shared lib
Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
{
return new DelayEffect( parent , static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
}
}}
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