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111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
/*
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* Amplifier.cpp - A native amplifier effect plugin with sample-exact amplification
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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) 2006-2014 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 "Amplifier.h"
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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 amplifier_plugin_descriptor =
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{
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LMMS_STRINGIFY(PLUGIN_NAME),
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"Amplifier",
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QT_TRANSLATE_NOOP("PluginBrowser", "A native amplifier plugin"),
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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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AmplifierEffect::AmplifierEffect(Model* parent, const Descriptor::SubPluginFeatures::Key* key) :
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Effect(&lifier_plugin_descriptor, parent, key),
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m_ampControls(this)
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{
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}
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bool AmplifierEffect::processAudioBuffer(sampleFrame* buf, const fpp_t frames)
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{
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if (!isEnabled() || !isRunning()) { return false ; }
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double outSum = 0.0;
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const float d = dryLevel();
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const float w = wetLevel();
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const ValueBuffer* volumeBuf = m_ampControls.m_volumeModel.valueBuffer();
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const ValueBuffer* panBuf = m_ampControls.m_panModel.valueBuffer();
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const ValueBuffer* leftBuf = m_ampControls.m_leftModel.valueBuffer();
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const ValueBuffer* rightBuf = m_ampControls.m_rightModel.valueBuffer();
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for (fpp_t f = 0; f < frames; ++f)
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{
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const float volume = (volumeBuf ? volumeBuf->value(f) : m_ampControls.m_volumeModel.value()) * 0.01f;
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const float pan = (panBuf ? panBuf->value(f) : m_ampControls.m_panModel.value()) * 0.01f;
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const float left = (leftBuf ? leftBuf->value(f) : m_ampControls.m_leftModel.value()) * 0.01f;
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const float right = (rightBuf ? rightBuf->value(f) : m_ampControls.m_rightModel.value()) * 0.01f;
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const float panLeft = std::min(1.0f, 1.0f - pan);
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const float panRight = std::min(1.0f, 1.0f + pan);
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auto s = std::array{buf[f][0], buf[f][1]};
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s[0] *= volume * left * panLeft;
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s[1] *= volume * right * panRight;
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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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outSum += buf[f][0] * buf[f][0] + buf[f][1] * buf[f][1];
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}
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checkGate(outSum / 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 AmplifierEffect(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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