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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.
157 lines
4.1 KiB
C++
157 lines
4.1 KiB
C++
/*
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* Dispersion.cpp
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*
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* Copyright (c) 2023 Lost Robot <r94231/at/gmail/dot/com>
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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 "Dispersion.h"
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#include <numbers>
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#include "embed.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 dispersion_plugin_descriptor =
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{
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LMMS_STRINGIFY(PLUGIN_NAME),
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"Dispersion",
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QT_TRANSLATE_NOOP("PluginBrowser", "An all-pass filter allowing for extremely high orders."),
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"Lost Robot <r94231/at/gmail/dot/com>",
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0x0100,
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Plugin::Type::Effect,
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new PixmapLoader("lmms-plugin-logo"),
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nullptr,
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nullptr
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};
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}
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DispersionEffect::DispersionEffect(Model* parent, const Descriptor::SubPluginFeatures::Key* key) :
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Effect(&dispersion_plugin_descriptor, parent, key),
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m_dispersionControls(this),
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m_sampleRate(Engine::audioEngine()->outputSampleRate()),
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m_amountVal(0)
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{
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}
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Effect::ProcessStatus DispersionEffect::processImpl(SampleFrame* buf, const fpp_t frames)
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{
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const float d = dryLevel();
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const float w = wetLevel();
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const int amount = m_dispersionControls.m_amountModel.value();
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const float freq = m_dispersionControls.m_freqModel.value();
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const float reso = m_dispersionControls.m_resoModel.value();
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float feedback = m_dispersionControls.m_feedbackModel.value();
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const bool dc = m_dispersionControls.m_dcModel.value();
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// All-pass coefficient calculation
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const float w0 = (2 * std::numbers::pi_v<float> / m_sampleRate) * freq;
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const float a0 = 1 + (std::sin(w0) / (reso * 2.f));
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float apCoeff1 = (1 - (a0 - 1)) / a0;
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float apCoeff2 = (-2 * std::cos(w0)) / a0;
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float dcCoeff = 0.001 * (44100.f / m_sampleRate);
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if (amount != m_amountVal)
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{
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if (amount < m_amountVal)
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{
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// Flush filter buffers when they're no longer in use
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for (int i = amount * 2; i < m_amountVal * 2; ++i)
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{
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m_state.x0[i] = m_state.x1[i] = m_state.y0[i] = m_state.y1[i] = 0;
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}
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}
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m_amountVal = amount;
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}
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if (amount == 0)
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{
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feedback = 0;
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m_feedbackVal[0] = m_feedbackVal[1] = 0;
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}
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for (fpp_t f = 0; f < frames; ++f)
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{
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std::array<sample_t, 2> s = { buf[f][0] + m_feedbackVal[0], buf[f][1] + m_feedbackVal[1] };
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runDispersionAP(m_amountVal, apCoeff1, apCoeff2, s);
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m_feedbackVal[0] = s[0] * feedback;
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m_feedbackVal[1] = s[1] * feedback;
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if (dc)
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{
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// DC offset removal
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for (int i = 0; i < 2; ++i)
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{
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m_integrator[i] = m_integrator[i] * (1.f - dcCoeff) + s[i] * dcCoeff;
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s[i] -= m_integrator[i];
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}
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}
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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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}
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return ProcessStatus::ContinueIfNotQuiet;
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}
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void DispersionEffect::runDispersionAP(const int filtNum, const float apCoeff1, const float apCoeff2, std::array<sample_t, 2> &put)
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{
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for (int i = 0; i < filtNum * 2; ++i)
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{
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const int channel = i % 2;
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const sample_t currentInput = put[channel];
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const sample_t filterOutput = apCoeff1 * (currentInput - m_state.y1[i])
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+ apCoeff2 * (m_state.x0[i] - m_state.y0[i]) + m_state.x1[i];
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m_state.x1[i] = m_state.x0[i];
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m_state.x0[i] = currentInput;
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m_state.y1[i] = m_state.y0[i];
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m_state.y0[i] = filterOutput;
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put[channel] = filterOutput;
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}
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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 DispersionEffect(parent, static_cast<const Plugin::Descriptor::SubPluginFeatures::Key *>(data));
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}
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}
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} // namespace lmms
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