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/*
* waveshaper.cpp - waveshaper effect-plugin
*
* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
* Copyright (c) 2006-2009 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 "waveshaper.h"
#include "lmms_math.h"
#include "embed.cpp"
#include "interpolation.h"
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT waveshaper_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"Waveshaper Effect",
QT_TRANSLATE_NOOP( "pluginBrowser",
"plugin for waveshaping" ),
"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
0x0100,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
}
waveShaperEffect::waveShaperEffect( Model * _parent,
const Descriptor::SubPluginFeatures::Key * _key ) :
Effect( &waveshaper_plugin_descriptor, _parent, _key ),
m_wsControls( this )
{
}
waveShaperEffect::~waveShaperEffect()
{
}
bool waveShaperEffect::processAudioBuffer( sampleFrame * _buf,
const fpp_t _frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
// variables for effect
int i = 0;
double out_sum = 0.0;
const float d = dryLevel();
const float w = wetLevel();
float input = m_wsControls.m_inputModel.value();
float output = m_wsControls.m_outputModel.value();
const float * samples = m_wsControls.m_wavegraphModel.samples();
const bool clip = m_wsControls.m_clipModel.value();
ValueBuffer *inputBuffer = m_wsControls.m_inputModel.valueBuffer();
ValueBuffer *outputBufer = m_wsControls.m_outputModel.valueBuffer();
int inputInc = inputBuffer ? 1 : 0;
int outputInc = outputBufer ? 1 : 0;
const float *inputPtr = inputBuffer ? &( inputBuffer->values()[ 0 ] ) : &input;
const float *outputPtr = outputBufer ? &( outputBufer->values()[ 0 ] ) : &output;
for( fpp_t f = 0; f < _frames; ++f )
{
float s[2] = { _buf[f][0], _buf[f][1] };
// apply input gain
s[0] *= *inputPtr;
s[1] *= *inputPtr;
// clip if clip enabled
if( clip )
{
s[0] = qBound( -1.0f, s[0], 1.0f );
s[1] = qBound( -1.0f, s[1], 1.0f );
}
// start effect
for( i=0; i <= 1; ++i )
{
const int lookup = static_cast<int>( qAbs( s[i] ) * 200.0f );
const float frac = fraction( qAbs( s[i] ) * 200.0f );
const float posneg = s[i] < 0 ? -1.0f : 1.0f;
if( lookup < 1 )
{
s[i] = frac * samples[0] * posneg;
}
else if( lookup < 200 )
{
s[i] = linearInterpolate( samples[ lookup - 1 ],
samples[ lookup ], frac )
* posneg;
}
else
{
s[i] *= samples[199];
}
}
// apply output gain
s[0] *= *outputPtr;
s[1] *= *outputPtr;
// mix wet/dry signals
_buf[f][0] = d * _buf[f][0] + w * s[0];
_buf[f][1] = d * _buf[f][1] + w * s[1];
out_sum += _buf[f][0] * _buf[f][0] + _buf[f][1] * _buf[f][1];
outputPtr += outputInc;
inputPtr += inputInc;
}
checkGate( out_sum / _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 waveShaperEffect( _parent,
static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>(
_data ) ) );
}
}
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