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173 lines
3.9 KiB
C++
173 lines
3.9 KiB
C++
/*
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* WaveShaper.cpp - waveshaper effect-plugin
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*
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* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
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* Copyright (c) 2006-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - https://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 "WaveShaper.h"
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#include "lmms_math.h"
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#include "embed.h"
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#include "interpolation.h"
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#include "plugin_export.h"
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namespace lmms
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{
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extern "C"
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{
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Plugin::Descriptor PLUGIN_EXPORT waveshaper_plugin_descriptor =
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{
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LMMS_STRINGIFY( PLUGIN_NAME ),
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"Waveshaper Effect",
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QT_TRANSLATE_NOOP( "PluginBrowser",
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"plugin for waveshaping" ),
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"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
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0x0100,
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Plugin::Type::Effect,
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new PluginPixmapLoader("logo"),
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nullptr,
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nullptr,
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} ;
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}
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WaveShaperEffect::WaveShaperEffect( Model * _parent,
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const Descriptor::SubPluginFeatures::Key * _key ) :
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Effect( &waveshaper_plugin_descriptor, _parent, _key ),
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m_wsControls( this )
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{
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}
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bool WaveShaperEffect::processAudioBuffer( sampleFrame * _buf,
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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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// variables for effect
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int i = 0;
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double out_sum = 0.0;
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const float d = dryLevel();
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const float w = wetLevel();
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float input = m_wsControls.m_inputModel.value();
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float output = m_wsControls.m_outputModel.value();
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const float * samples = m_wsControls.m_wavegraphModel.samples();
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const bool clip = m_wsControls.m_clipModel.value();
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ValueBuffer *inputBuffer = m_wsControls.m_inputModel.valueBuffer();
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ValueBuffer *outputBufer = m_wsControls.m_outputModel.valueBuffer();
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int inputInc = inputBuffer ? 1 : 0;
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int outputInc = outputBufer ? 1 : 0;
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const float *inputPtr = inputBuffer ? &( inputBuffer->values()[ 0 ] ) : &input;
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const float *outputPtr = outputBufer ? &( outputBufer->values()[ 0 ] ) : &output;
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for( fpp_t f = 0; f < _frames; ++f )
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{
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auto s = std::array{_buf[f][0], _buf[f][1]};
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// apply input gain
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s[0] *= *inputPtr;
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s[1] *= *inputPtr;
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// clip if clip enabled
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if( clip )
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{
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s[0] = qBound( -1.0f, s[0], 1.0f );
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s[1] = qBound( -1.0f, s[1], 1.0f );
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}
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// start effect
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for( i=0; i <= 1; ++i )
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{
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const int lookup = static_cast<int>( qAbs( s[i] ) * 200.0f );
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const float frac = fraction( qAbs( s[i] ) * 200.0f );
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const float posneg = s[i] < 0 ? -1.0f : 1.0f;
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if( lookup < 1 )
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{
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s[i] = frac * samples[0] * posneg;
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}
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else if( lookup < 200 )
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{
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s[i] = linearInterpolate( samples[ lookup - 1 ],
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samples[ lookup ], frac )
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* posneg;
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}
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else
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{
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s[i] *= samples[199];
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}
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}
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// apply output gain
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s[0] *= *outputPtr;
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s[1] *= *outputPtr;
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// mix wet/dry signals
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_buf[f][0] = d * _buf[f][0] + w * s[0];
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_buf[f][1] = d * _buf[f][1] + w * s[1];
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out_sum += _buf[f][0] * _buf[f][0] + _buf[f][1] * _buf[f][1];
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outputPtr += outputInc;
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inputPtr += inputInc;
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}
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checkGate( out_sum / _frames );
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return( isRunning() );
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}
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extern "C"
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{
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// necessary for getting instance out of shared lib
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PLUGIN_EXPORT Plugin * lmms_plugin_main( Model * _parent, void * _data )
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{
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return( new WaveShaperEffect( _parent,
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static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>(
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_data ) ) );
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}
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}
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} // namespace lmms
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