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103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
/*
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* Simple Limiter (source)
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*
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* File : SimpleLimit.cpp
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* Library : SimpleSource
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* Version : 1.12
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* Implements : SimpleLimit
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*
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* 2006, ChunkWare Music Software, OPEN-SOURCE
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "SimpleLimit.h"
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namespace chunkware_simple
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{
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//-------------------------------------------------------------
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SimpleLimit::SimpleLimit()
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: threshdB_(0.0)
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, thresh_(1.0)
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, peakHold_(0)
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, peakTimer_(0)
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, maxPeak_(1.0)
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, att_(1.0)
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, rel_(10.0)
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, env_(1.0)
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, mask_(BUFFER_SIZE - 1)
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, cur_(0)
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{
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setAttackImpl(1.0);
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outBuffer_[ 0 ].resize(BUFFER_SIZE, 0.0);
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outBuffer_[ 1 ].resize(BUFFER_SIZE, 0.0);
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}
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//-------------------------------------------------------------
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void SimpleLimit::setThresh(double dB)
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{
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threshdB_ = dB;
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thresh_ = dB2lin(dB);
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}
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//-------------------------------------------------------------
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void SimpleLimit::setAttackImpl(double ms)
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{
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unsigned int samp = static_cast<unsigned>(0.001 * ms * att_.getSampleRate());
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assert(samp < BUFFER_SIZE);
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peakHold_ = samp;
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att_.setTc(ms);
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}
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//-------------------------------------------------------------
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void SimpleLimit::setRelease(double ms)
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{
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rel_.setTc(ms);
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}
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//-------------------------------------------------------------
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void SimpleLimit::setSampleRate(double sampleRate)
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{
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att_.setSampleRate(sampleRate);
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rel_.setSampleRate(sampleRate);
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}
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//-------------------------------------------------------------
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void SimpleLimit::initRuntime(void)
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{
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peakTimer_ = 0;
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maxPeak_ = thresh_;
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env_ = thresh_;
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cur_ = 0;
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outBuffer_[ 0 ].assign(BUFFER_SIZE, 0.0);
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outBuffer_[ 1 ].assign(BUFFER_SIZE, 0.0);
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}
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//-------------------------------------------------------------
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void SimpleLimit::FastEnvelope::setCoef(void)
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{
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// rises to 99% of in value over duration of time constant
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coef_ = pow(0.01, (1000.0 / (ms_ * sampleRate_)));
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}
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} // end namespace chunkware_simple
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