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/*
* ReverbSC.cpp - A native reverb based on an algorithm by Sean Costello
*
* 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 <math.h>
#include "ReverbSC.h"
#include "embed.cpp"
#define DB2LIN(X) pow(10, X / 20.0f);
extern "C"
{
Plugin::Descriptor PLUGIN_EXPORT reverbsc_plugin_descriptor =
{
STRINGIFY( PLUGIN_NAME ),
"ReverbSC",
QT_TRANSLATE_NOOP( "pluginBrowser", "Reverb algorithm by Sean Costello" ),
"Paul Batchelor",
0x0123,
Plugin::Effect,
new PluginPixmapLoader( "logo" ),
NULL,
NULL
} ;
}
ReverbSCEffect::ReverbSCEffect( Model* parent, const Descriptor::SubPluginFeatures::Key* key ) :
Effect( &reverbsc_plugin_descriptor, parent, key ),
m_reverbSCControls( this )
{
sp_create(&sp);
sp->sr = Engine::mixer()->processingSampleRate();
sp_revsc_create(&revsc);
sp_revsc_init(sp, revsc);
sp_dcblock_create(&dcblk[0]);
sp_dcblock_create(&dcblk[1]);
sp_dcblock_init(sp, dcblk[0], Engine::mixer()->currentQualitySettings().sampleRateMultiplier() );
sp_dcblock_init(sp, dcblk[1], Engine::mixer()->currentQualitySettings().sampleRateMultiplier() );
}
ReverbSCEffect::~ReverbSCEffect()
{
sp_revsc_destroy(&revsc);
sp_dcblock_destroy(&dcblk[0]);
sp_dcblock_destroy(&dcblk[1]);
sp_destroy(&sp);
}
bool ReverbSCEffect::processAudioBuffer( sampleFrame* buf, const fpp_t frames )
{
if( !isEnabled() || !isRunning () )
{
return( false );
}
double outSum = 0.0;
const float d = dryLevel();
const float w = wetLevel();
SPFLOAT tmpL, tmpR;
SPFLOAT dcblkL, dcblkR;
ValueBuffer * inGainBuf = m_reverbSCControls.m_inputGainModel.valueBuffer();
ValueBuffer * sizeBuf = m_reverbSCControls.m_sizeModel.valueBuffer();
ValueBuffer * colorBuf = m_reverbSCControls.m_colorModel.valueBuffer();
ValueBuffer * outGainBuf = m_reverbSCControls.m_outputGainModel.valueBuffer();
for( fpp_t f = 0; f < frames; ++f )
{
sample_t s[2] = { buf[f][0], buf[f][1] };
const SPFLOAT inGain = (SPFLOAT)DB2LIN((inGainBuf ?
inGainBuf->values()[f]
: m_reverbSCControls.m_inputGainModel.value()));
const SPFLOAT outGain = (SPFLOAT)DB2LIN((outGainBuf ?
outGainBuf->values()[f]
: m_reverbSCControls.m_outputGainModel.value()));
s[0] *= inGain;
s[1] *= inGain;
revsc->feedback = (SPFLOAT)(sizeBuf ?
sizeBuf->values()[f]
: m_reverbSCControls.m_sizeModel.value());
revsc->lpfreq = (SPFLOAT)(colorBuf ?
colorBuf->values()[f]
: m_reverbSCControls.m_colorModel.value());
sp_revsc_compute(sp, revsc, &s[0], &s[1], &tmpL, &tmpR);
sp_dcblock_compute(sp, dcblk[0], &tmpL, &dcblkL);
sp_dcblock_compute(sp, dcblk[1], &tmpR, &dcblkR);
buf[f][0] = d * buf[f][0] + w * dcblkL * outGain;
buf[f][1] = d * buf[f][1] + w * dcblkR * outGain;
outSum += buf[f][0]*buf[f][0] + buf[f][1]*buf[f][1];
}
checkGate( outSum / frames );
return isRunning();
}
void ReverbSCEffect::changeSampleRate()
{
// Change sr variable in Soundpipe. does not need to be destroyed
sp->sr = Engine::mixer()->processingSampleRate();
mutex.lock();
sp_revsc_destroy(&revsc);
sp_dcblock_destroy(&dcblk[0]);
sp_dcblock_destroy(&dcblk[1]);
sp_revsc_create(&revsc);
sp_revsc_init(sp, revsc);
sp_dcblock_create(&dcblk[0]);
sp_dcblock_create(&dcblk[1]);
sp_dcblock_init(sp, dcblk[0], Engine::mixer()->currentQualitySettings().sampleRateMultiplier() );
sp_dcblock_init(sp, dcblk[1], Engine::mixer()->currentQualitySettings().sampleRateMultiplier() );
mutex.unlock();
}
extern "C"
{
// necessary for getting instance out of shared lib
Plugin * PLUGIN_EXPORT lmms_plugin_main( Model* parent, void* data )
{
return new ReverbSCEffect(
parent,
static_cast<const Plugin::Descriptor::SubPluginFeatures::Key*>(data)
);
}
}
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