mirror of
https://github.com/LMMS/lmms.git
synced 2025-12-23 22:58:33 -05:00
bfa04c987d
* Centralize standard LMMS plugin logo Previously, every single plugin would have its own copy of this image. Now, these plugins pull it from the theme. I'm not sure it's valuable for this to be themeable, but AFAIK it's the place all the other non-plugin resources are stored, so that's where it goes for now.
253 lines
6.9 KiB
C++
253 lines
6.9 KiB
C++
/*
|
|
* Bitcrush.cpp - A native bitcrusher
|
|
*
|
|
* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
|
|
* Copyright (c) 2006-2014 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 "Bitcrush.h"
|
|
#include "lmms_math.h"
|
|
#include "embed.h"
|
|
#include "plugin_export.h"
|
|
|
|
namespace lmms
|
|
{
|
|
|
|
|
|
const int OS_RATE = 5;
|
|
const float OS_RATIO = 1.0f / OS_RATE;
|
|
const float CUTOFF_RATIO = 0.353553391f;
|
|
const int SILENCEFRAMES = 10;
|
|
const auto OS_RESAMPLE = std::array{0.0001490062883964112f, 0.1645978376763992f, 0.6705063120704088f,
|
|
0.1645978376763992f, 0.0001490062883964112f };
|
|
|
|
extern "C"
|
|
{
|
|
|
|
Plugin::Descriptor PLUGIN_EXPORT bitcrush_plugin_descriptor =
|
|
{
|
|
LMMS_STRINGIFY( PLUGIN_NAME ),
|
|
"Bitcrush",
|
|
QT_TRANSLATE_NOOP( "PluginBrowser", "An oversampling bitcrusher" ),
|
|
"Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>",
|
|
0x0100,
|
|
Plugin::Type::Effect,
|
|
new PixmapLoader("lmms-plugin-logo"),
|
|
nullptr,
|
|
nullptr,
|
|
};
|
|
|
|
}
|
|
|
|
BitcrushEffect::BitcrushEffect( Model * parent, const Descriptor::SubPluginFeatures::Key * key ) :
|
|
Effect( &bitcrush_plugin_descriptor, parent, key ),
|
|
m_controls( this ),
|
|
m_sampleRate( Engine::audioEngine()->outputSampleRate() ),
|
|
m_filter( m_sampleRate )
|
|
{
|
|
m_buffer = new SampleFrame[Engine::audioEngine()->framesPerPeriod() * OS_RATE];
|
|
m_filter.setLowpass( m_sampleRate * ( CUTOFF_RATIO * OS_RATIO ) );
|
|
m_needsUpdate = true;
|
|
|
|
m_bitCounterL = 0.0f;
|
|
m_bitCounterR = 0.0f;
|
|
|
|
m_left = 0.0f;
|
|
m_right = 0.0f;
|
|
|
|
m_silenceCounter = 0;
|
|
}
|
|
|
|
BitcrushEffect::~BitcrushEffect()
|
|
{
|
|
delete[] m_buffer;
|
|
}
|
|
|
|
|
|
void BitcrushEffect::sampleRateChanged()
|
|
{
|
|
m_sampleRate = Engine::audioEngine()->outputSampleRate();
|
|
m_filter.setSampleRate( m_sampleRate );
|
|
m_filter.setLowpass( m_sampleRate * ( CUTOFF_RATIO * OS_RATIO ) );
|
|
m_needsUpdate = true;
|
|
}
|
|
|
|
|
|
inline float BitcrushEffect::depthCrush( float in )
|
|
{
|
|
return roundf( in * (float) m_levels ) * m_levelsRatio;
|
|
}
|
|
|
|
inline float BitcrushEffect::noise( float amt )
|
|
{
|
|
return fastRand(-amt, +amt);
|
|
}
|
|
|
|
Effect::ProcessStatus BitcrushEffect::processImpl(SampleFrame* buf, const fpp_t frames)
|
|
{
|
|
// update values
|
|
if( m_needsUpdate || m_controls.m_rateEnabled.isValueChanged() )
|
|
{
|
|
m_rateEnabled = m_controls.m_rateEnabled.value();
|
|
m_bitCounterL = 0.0f;
|
|
m_bitCounterR = 0.0f;
|
|
}
|
|
if( m_needsUpdate || m_controls.m_depthEnabled.isValueChanged() )
|
|
{
|
|
m_depthEnabled = m_controls.m_depthEnabled.value();
|
|
}
|
|
if( m_needsUpdate || m_controls.m_rate.isValueChanged() || m_controls.m_stereoDiff.isValueChanged() )
|
|
{
|
|
const float rate = m_controls.m_rate.value();
|
|
const float diff = m_controls.m_stereoDiff.value() * 0.005 * rate;
|
|
|
|
m_rateCoeffL = ( m_sampleRate * OS_RATE ) / ( rate - diff );
|
|
m_rateCoeffR = ( m_sampleRate * OS_RATE ) / ( rate + diff );
|
|
|
|
m_bitCounterL = 0.0f;
|
|
m_bitCounterR = 0.0f;
|
|
}
|
|
if( m_needsUpdate || m_controls.m_levels.isValueChanged() )
|
|
{
|
|
m_levels = m_controls.m_levels.value();
|
|
m_levelsRatio = 1.0f / (float) m_levels;
|
|
}
|
|
if( m_needsUpdate || m_controls.m_inGain.isValueChanged() )
|
|
{
|
|
m_inGain = dbfsToAmp( m_controls.m_inGain.value() );
|
|
}
|
|
if( m_needsUpdate || m_controls.m_outGain.isValueChanged() )
|
|
{
|
|
m_outGain = dbfsToAmp( m_controls.m_outGain.value() );
|
|
}
|
|
if( m_needsUpdate || m_controls.m_outClip.isValueChanged() )
|
|
{
|
|
m_outClip = dbfsToAmp( m_controls.m_outClip.value() );
|
|
}
|
|
m_needsUpdate = false;
|
|
|
|
const float noiseAmt = m_controls.m_inNoise.value() * 0.01f;
|
|
|
|
// read input buffer and write it to oversampled buffer
|
|
if( m_rateEnabled ) // rate crushing enabled so do that
|
|
{
|
|
for (auto f = std::size_t{0}; f < frames; ++f)
|
|
{
|
|
for( int o = 0; o < OS_RATE; ++o )
|
|
{
|
|
m_buffer[f * OS_RATE + o][0] = m_left;
|
|
m_buffer[f * OS_RATE + o][1] = m_right;
|
|
m_bitCounterL += 1.0f;
|
|
m_bitCounterR += 1.0f;
|
|
if( m_bitCounterL > m_rateCoeffL )
|
|
{
|
|
m_bitCounterL -= m_rateCoeffL;
|
|
m_left = m_depthEnabled
|
|
? depthCrush( buf[f][0] * m_inGain + noise( buf[f][0] * noiseAmt ) )
|
|
: buf[f][0] * m_inGain + noise( buf[f][0] * noiseAmt );
|
|
}
|
|
if( m_bitCounterR > m_rateCoeffR )
|
|
{
|
|
m_bitCounterR -= m_rateCoeffR;
|
|
m_right = m_depthEnabled
|
|
? depthCrush( buf[f][1] * m_inGain + noise( buf[f][1] * noiseAmt ) )
|
|
: buf[f][1] * m_inGain + noise( buf[f][1] * noiseAmt );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else // rate crushing disabled: simply oversample with zero-order hold
|
|
{
|
|
for (auto f = std::size_t{0}; f < frames; ++f)
|
|
{
|
|
for( int o = 0; o < OS_RATE; ++o )
|
|
{
|
|
m_buffer[f * OS_RATE + o][0] = m_depthEnabled
|
|
? depthCrush( buf[f][0] * m_inGain + noise( buf[f][0] * noiseAmt ) )
|
|
: buf[f][0] * m_inGain + noise( buf[f][0] * noiseAmt );
|
|
m_buffer[f * OS_RATE + o][1] = m_depthEnabled
|
|
? depthCrush( buf[f][1] * m_inGain + noise( buf[f][1] * noiseAmt ) )
|
|
: buf[f][1] * m_inGain + noise( buf[f][1] * noiseAmt );
|
|
}
|
|
}
|
|
}
|
|
|
|
// the oversampled buffer is now written, so filter it to reduce aliasing
|
|
|
|
for (auto f = std::size_t{0}; f < frames * OS_RATE; ++f)
|
|
{
|
|
if( qMax( qAbs( m_buffer[f][0] ), qAbs( m_buffer[f][1] ) ) >= 1.0e-10f )
|
|
{
|
|
m_silenceCounter = 0;
|
|
m_buffer[f][0] = m_filter.update( m_buffer[f][0], 0 );
|
|
m_buffer[f][1] = m_filter.update( m_buffer[f][1], 1 );
|
|
}
|
|
else
|
|
{
|
|
if( m_silenceCounter > SILENCEFRAMES )
|
|
{
|
|
m_buffer[f][0] = m_buffer[f][1] = 0.0f;
|
|
}
|
|
else
|
|
{
|
|
++m_silenceCounter;
|
|
m_buffer[f][0] = m_filter.update( m_buffer[f][0], 0 );
|
|
m_buffer[f][1] = m_filter.update( m_buffer[f][1], 1 );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// now downsample and write it back to main buffer
|
|
|
|
const float d = dryLevel();
|
|
const float w = wetLevel();
|
|
for (auto f = std::size_t{0}; f < frames; ++f)
|
|
{
|
|
float lsum = 0.0f;
|
|
float rsum = 0.0f;
|
|
for( int o = 0; o < OS_RATE; ++o )
|
|
{
|
|
lsum += m_buffer[f * OS_RATE + o][0] * OS_RESAMPLE[o];
|
|
rsum += m_buffer[f * OS_RATE + o][1] * OS_RESAMPLE[o];
|
|
}
|
|
buf[f][0] = d * buf[f][0] + w * qBound( -m_outClip, lsum, m_outClip ) * m_outGain;
|
|
buf[f][1] = d * buf[f][1] + w * qBound( -m_outClip, rsum, m_outClip ) * m_outGain;
|
|
}
|
|
|
|
return ProcessStatus::ContinueIfNotQuiet;
|
|
}
|
|
|
|
|
|
extern "C"
|
|
{
|
|
|
|
// necessary for getting instance out of shared lib
|
|
PLUGIN_EXPORT Plugin * lmms_plugin_main( Model* parent, void* data )
|
|
{
|
|
return new BitcrushEffect( parent, static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>( data ) );
|
|
}
|
|
|
|
}
|
|
|
|
|
|
} // namespace lmms
|