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https://github.com/LMMS/lmms.git
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175 lines
3.6 KiB
C++
175 lines
3.6 KiB
C++
/*
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* stereo_enhancer.cpp - stereo-enhancer-effect-plugin
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*
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* Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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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 "stereo_enhancer.h"
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#include "embed.cpp"
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extern "C"
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{
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Plugin::Descriptor PLUGIN_EXPORT stereoenhancer_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"StereoEnhancer Effect",
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QT_TRANSLATE_NOOP( "pluginBrowser",
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"Plugin for enhancing stereo separation of a stereo input file" ),
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"Lou Herard <lherard/at/gmail.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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}
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stereoEnhancerEffect::stereoEnhancerEffect(
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Model * _parent,
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const Descriptor::SubPluginFeatures::Key * _key ) :
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Effect( &stereoenhancer_plugin_descriptor, _parent, _key ),
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m_seFX( DspEffectLibrary::StereoEnhancer( 0.0f ) ),
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m_delayBuffer( new sampleFrame[DEFAULT_BUFFER_SIZE] ),
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m_currFrame( 0 ),
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m_bbControls( this )
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{
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// TODO: Make m_delayBuffer customizable?
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clearMyBuffer();
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}
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stereoEnhancerEffect::~stereoEnhancerEffect()
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{
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if( m_delayBuffer )
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{
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delete [] m_delayBuffer;
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}
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m_currFrame = 0;
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}
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bool stereoEnhancerEffect::processAudioBuffer( sampleFrame * _buf,
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const fpp_t _frames )
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{
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// This appears to be used for determining whether or not to continue processing
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// audio with this effect
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double out_sum = 0.0;
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float width;
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int frameIndex = 0;
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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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const float d = dryLevel();
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const float w = wetLevel();
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for( fpp_t f = 0; f < _frames; ++f )
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{
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// copy samples into the delay buffer
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m_delayBuffer[m_currFrame][0] = _buf[f][0];
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m_delayBuffer[m_currFrame][1] = _buf[f][1];
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// Get the width knob value from the Stereo Enhancer effect
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width = m_seFX.wideCoeff();
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// Calculate the correct sample frame for processing
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frameIndex = m_currFrame - width;
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if( frameIndex < 0 )
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{
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// e.g. difference = -10, frameIndex = DBS - 10
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frameIndex += DEFAULT_BUFFER_SIZE;
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}
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//sample_t s[2] = { _buf[f][0], _buf[f][1] }; //Vanilla
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sample_t s[2] = { _buf[f][0], m_delayBuffer[frameIndex][1] }; //Chocolate
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m_seFX.nextSample( s[0], s[1] );
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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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// Update currFrame
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m_currFrame += 1;
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m_currFrame %= DEFAULT_BUFFER_SIZE;
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}
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checkGate( out_sum / _frames );
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if( !isRunning() )
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{
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clearMyBuffer();
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}
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return( isRunning() );
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}
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void stereoEnhancerEffect::clearMyBuffer()
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{
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int i;
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for (i = 0; i < DEFAULT_BUFFER_SIZE; i++)
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{
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m_delayBuffer[i][0] = 0.0f;
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m_delayBuffer[i][1] = 0.0f;
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}
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m_currFrame = 0;
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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 * PLUGIN_EXPORT lmms_plugin_main( Model * _parent, void * _data )
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{
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return( new stereoEnhancerEffect( _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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