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https://github.com/LMMS/lmms.git
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4f76241e68
The original delay code, was setting it read index relative to the length of the delay. This fixes that, now when the length is changed the read index stays in the correct place in the buffer.
167 lines
4.6 KiB
C++
167 lines
4.6 KiB
C++
/*
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* delayeffect.cpp - definition of the DelayEffect class. The Delay Plugin
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*
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* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
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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 "DelayEffect.h"
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#include "Engine.h"
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#include "embed.cpp"
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#include "interpolation.h"
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extern "C"
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{
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Plugin::Descriptor PLUGIN_EXPORT delay_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"Delay",
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QT_TRANSLATE_NOOP( "pluginBrowser", "A native delay plugin" ),
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"Dave French <contact/dot/dave/dot/french3/at/googlemail/dot/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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DelayEffect::DelayEffect( Model* parent, const Plugin::Descriptor::SubPluginFeatures::Key* key ) :
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Effect( &delay_plugin_descriptor, parent, key ),
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m_delayControls( this )
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{
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m_delay = 0;
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m_delay = new StereoDelay( 20, Engine::mixer()->processingSampleRate() );
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m_lfo = new Lfo( Engine::mixer()->processingSampleRate() );
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m_outGain = 1.0;
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}
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DelayEffect::~DelayEffect()
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{
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if( m_delay )
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{
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delete m_delay;
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}
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if( m_lfo )
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{
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delete m_lfo;
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}
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}
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bool DelayEffect::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 sr = Engine::mixer()->processingSampleRate();
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const float d = dryLevel();
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const float w = wetLevel();
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sample_t dryS[2];
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float lPeak = 0.0;
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float rPeak = 0.0;
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float length = m_delayControls.m_delayTimeModel.value();
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float amplitude = m_delayControls.m_lfoAmountModel.value() * sr;
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float lfoTime = 1.0 / m_delayControls.m_lfoTimeModel.value();
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float feedback = m_delayControls.m_feedbackModel.value();
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ValueBuffer *lengthBuffer = m_delayControls.m_delayTimeModel.valueBuffer();
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ValueBuffer *feedbackBuffer = m_delayControls.m_feedbackModel.valueBuffer();
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ValueBuffer *lfoTimeBuffer = m_delayControls.m_lfoTimeModel.valueBuffer();
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ValueBuffer *lfoAmountBuffer = m_delayControls.m_lfoAmountModel.valueBuffer();
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int lengthInc = lengthBuffer ? 1 : 0;
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int amplitudeInc = lfoAmountBuffer ? 1 : 0;
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int lfoTimeInc = lfoTimeBuffer ? 1 : 0;
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int feedbackInc = feedbackBuffer ? 1 : 0;
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float *lengthPtr = lengthBuffer ? &( lengthBuffer->values()[ 0 ] ) : &length;
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float *amplitudePtr = lfoAmountBuffer ? &( lfoAmountBuffer->values()[ 0 ] ) : &litude;
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float *lfoTimePtr = lfoTimeBuffer ? &( lfoTimeBuffer->values()[ 0 ] ) : &lfoTime;
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float *feedbackPtr = feedbackBuffer ? &( feedbackBuffer->values()[ 0 ] ) : &feedback;
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if( m_delayControls.m_outGainModel.isValueChanged() )
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{
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m_outGain = dbvToAmp( m_delayControls.m_outGainModel.value() );
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}
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int sampleLength;
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for( fpp_t f = 0; f < frames; ++f )
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{
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dryS[0] = buf[f][0];
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dryS[1] = buf[f][1];
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m_delay->setFeedback( *feedbackPtr );
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m_lfo->setFrequency( *lfoTimePtr );
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sampleLength = *lengthPtr * Engine::mixer()->processingSampleRate();
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m_currentLength = sampleLength;
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m_delay->setLength( m_currentLength + ( *amplitudePtr * ( float )m_lfo->tick() ) );
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m_delay->tick( buf[f] );
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buf[f][0] *= m_outGain;
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buf[f][1] *= m_outGain;
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lPeak = buf[f][0] > lPeak ? buf[f][0] : lPeak;
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rPeak = buf[f][1] > rPeak ? buf[f][1] : rPeak;
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buf[f][0] = ( d * dryS[0] ) + ( w * buf[f][0] );
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buf[f][1] = ( d * dryS[1] ) + ( w * buf[f][1] );
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outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
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lengthPtr += lengthInc;
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amplitudePtr += amplitudeInc;
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lfoTimePtr += lfoTimeInc;
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feedbackPtr += feedbackInc;
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}
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checkGate( outSum / frames );
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m_delayControls.m_outPeakL = lPeak;
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m_delayControls.m_outPeakR = rPeak;
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return isRunning();
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}
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void DelayEffect::changeSampleRate()
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{
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m_lfo->setSampleRate( Engine::mixer()->processingSampleRate() );
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m_delay->setSampleRate( Engine::mixer()->processingSampleRate() );
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}
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extern "C"
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{
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//needed for getting plugin 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 DelayEffect( parent , static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
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}
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}}
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