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/*
* MultitapEcho.cpp - a multitap echo delay plugin
*
* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
* Copyright (c) 2008-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
*
* 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 "MultitapEcho.h"
#include "embed.cpp"
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT multitapecho_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"Multitap Echo",
QT_TRANSLATE_NOOP( "pluginBrowser", "A multitap echo delay plugin" ),
"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
0x0100,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
}
MultitapEchoEffect::MultitapEchoEffect( Model* parent, const Descriptor::SubPluginFeatures::Key* key ) :
Effect( &multitapecho_plugin_descriptor, parent, key ),
m_stages( 1 ),
m_controls( this ),
m_buffer( 16100.0f ),
m_sampleRate( Engine::mixer()->processingSampleRate() ),
m_sampleRatio( 1.0f / m_sampleRate )
{
m_work = MM_ALLOC( sampleFrame, Engine::mixer()->framesPerPeriod() );
m_buffer.reset();
m_stages = static_cast<int>( m_controls.m_stages.value() );
updateFilters( 0, 19 );
}
MultitapEchoEffect::~MultitapEchoEffect()
{
MM_FREE( m_work );
}
void MultitapEchoEffect::updateFilters( int begin, int end )
{
for( int i = begin; i <= end; ++i )
{
for( int s = 0; s < m_stages; ++s )
{
setFilterFreq( m_lpFreq[i] * m_sampleRatio, m_filter[i][s] );
}
}
}
void MultitapEchoEffect::runFilter( sampleFrame * dst, sampleFrame * src, StereoOnePole & filter, const fpp_t frames )
{
for( int f = 0; f < frames; ++f )
{
dst[f][0] = filter.update( src[f][0], 0 );
dst[f][1] = filter.update( src[f][1], 1 );
}
}
bool MultitapEchoEffect::processAudioBuffer( sampleFrame * buf, const fpp_t frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
double outSum = 0.0;
const float d = dryLevel();
const float w = wetLevel();
// get processing vars
const int steps = m_controls.m_steps.value();
const float stepLength = m_controls.m_stepLength.value();
const float dryGain = dbfsToAmp( m_controls.m_dryGain.value() );
const bool swapInputs = m_controls.m_swapInputs.value();
// check if number of stages has changed
if( m_controls.m_stages.isValueChanged() )
{
m_stages = static_cast<int>( m_controls.m_stages.value() );
updateFilters( 0, steps - 1 );
}
// add dry buffer - never swap inputs for dry
m_buffer.writeAddingMultiplied( buf, 0, frames, dryGain );
// swapped inputs?
if( swapInputs )
{
float offset = stepLength;
for( int i = 0; i < steps; ++i ) // add all steps swapped
{
for( int s = 0; s < m_stages; ++s )
{
runFilter( m_work, buf, m_filter[i][s], frames );
}
m_buffer.writeSwappedAddingMultiplied( m_work, offset, frames, m_amp[i] );
offset += stepLength;
}
}
else
{
float offset = stepLength;
for( int i = 0; i < steps; ++i ) // add all steps
{
for( int s = 0; s < m_stages; ++s )
{
runFilter( m_work, buf, m_filter[i][s], frames );
}
m_buffer.writeAddingMultiplied( m_work, offset, frames, m_amp[i] );
offset += stepLength;
}
}
// pop the buffer and mix it into output
m_buffer.pop( m_work );
for( int f = 0; f < frames; ++f )
{
buf[f][0] = d * buf[f][0] + w * m_work[f][0];
buf[f][1] = d * buf[f][1] + w * m_work[f][1];
outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
}
checkGate( outSum / frames );
return isRunning();
}
extern "C"
{
// necessary for getting instance out of shared lib
Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
{
return new MultitapEchoEffect( parent, static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
}
}
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