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7367750823
* Renamed lmms_basics.h to LmmsTypes.h and scoped it down for that purpose. * Shifted the LMMS_STRINGIFY macro to it's own header. * Removed the debug.h header file and use cmake to handle the macro logic. * Remove some unused headers and include directives
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/*
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* VibratingString.cpp - model of a vibrating string lifted from pluckedSynth
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*
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* Copyright (c) 2006-2008 Danny McRae <khjklujn/at/yahoo/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 "VibratingString.h"
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#include "interpolation.h"
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#include "AudioEngine.h"
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#include "Engine.h"
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#include "LmmsTypes.h"
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#include <algorithm>
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#include <cstdlib>
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namespace lmms
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{
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VibratingString::VibratingString(float pitch, float pick, float pickup, const float* impulse, int len,
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sample_rate_t sampleRate, int oversample, float randomize, float stringLoss, float detune, bool state) :
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m_oversample{2 * oversample / static_cast<int>(sampleRate / Engine::audioEngine()->baseSampleRate())},
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m_randomize{randomize},
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m_stringLoss{1.0f - stringLoss},
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m_choice{static_cast<int>(m_oversample * static_cast<float>(std::rand()) / static_cast<float>(RAND_MAX))},
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m_state{0.1f},
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m_outsamp{std::make_unique<sample_t[]>(m_oversample)}
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{
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int stringLength = static_cast<int>(m_oversample * sampleRate / pitch) + 1;
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stringLength += static_cast<int>(stringLength * -detune);
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const int pickInt = static_cast<int>(std::ceil(stringLength * pick));
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if (!state)
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{
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m_impulse = std::make_unique<float[]>(stringLength);
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resample(impulse, len, stringLength);
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}
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else
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{
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m_impulse = std::make_unique<float[]>(len);
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std::copy_n(impulse, len, m_impulse.get());
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}
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m_toBridge = VibratingString::initDelayLine(stringLength);
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m_fromBridge = VibratingString::initDelayLine(stringLength);
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VibratingString::setDelayLine(m_toBridge.get(), pickInt, m_impulse.get(), len, 0.5f, state);
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VibratingString::setDelayLine(m_fromBridge.get(), pickInt, m_impulse.get(), len, 0.5f, state);
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m_pickupLoc = static_cast<int>(pickup * stringLength);
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}
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std::unique_ptr<VibratingString::DelayLine> VibratingString::initDelayLine(int len)
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{
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auto dl = std::make_unique<VibratingString::DelayLine>();
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dl->length = len;
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if (len > 0)
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{
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dl->data = std::make_unique<sample_t[]>(len);
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for (int i = 0; i < dl->length; ++i)
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{
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float r = static_cast<float>(std::rand()) / static_cast<float>(RAND_MAX);
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float offset = (m_randomize / 2.0f - m_randomize) * r;
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dl->data[i] = offset;
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}
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}
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else
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{
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dl->data = nullptr;
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}
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dl->pointer = dl->data.get();
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dl->end = dl->data.get() + len - 1;
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return dl;
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}
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void VibratingString::resample(const float* src, f_cnt_t srcFrames, f_cnt_t dstFrames)
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{
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for (f_cnt_t frame = 0; frame < dstFrames; ++frame)
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{
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const float srcFrameFloat = frame * static_cast<float>(srcFrames) / dstFrames;
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const float fracPos = srcFrameFloat - static_cast<f_cnt_t>(srcFrameFloat);
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const f_cnt_t srcFrame = std::clamp(static_cast<f_cnt_t>(srcFrameFloat), f_cnt_t{1}, srcFrames - 3);
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m_impulse[frame] = cubicInterpolate(
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src[srcFrame - 1],
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src[srcFrame + 0],
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src[srcFrame + 1],
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src[srcFrame + 2],
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fracPos);
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}
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}
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} // namespace lmms
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