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100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*
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* Simple Envelope Detectors (source)
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*
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* File : SimpleEnvelope.cpp
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* Library : SimpleSource
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* Version : 1.12
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* Implements : EnvelopeDetector, AttRelEnvelope
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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 "SimpleEnvelope.h"
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namespace chunkware_simple
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{
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//-------------------------------------------------------------
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// envelope detector
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//-------------------------------------------------------------
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EnvelopeDetector::EnvelopeDetector(double ms, double sampleRate)
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{
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assert(sampleRate > 0.0);
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assert(ms > 0.0);
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sampleRate_ = sampleRate;
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ms_ = ms;
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// setCoef();
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// TODO: KB avoid virtual function call in ctor
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coef_ = exp(-1000.0 / (ms_ * sampleRate_));
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}
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//-------------------------------------------------------------
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void EnvelopeDetector::setTc(double ms)
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{
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assert(ms > 0.0);
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ms_ = ms;
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setCoef();
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}
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//-------------------------------------------------------------
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void EnvelopeDetector::setSampleRate(double sampleRate)
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{
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assert(sampleRate > 0.0);
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sampleRate_ = sampleRate;
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setCoef();
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}
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//-------------------------------------------------------------
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void EnvelopeDetector::setCoef(void)
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{
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coef_ = exp(-1000.0 / (ms_ * sampleRate_));
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}
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//-------------------------------------------------------------
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// attack/release envelope
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//-------------------------------------------------------------
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AttRelEnvelope::AttRelEnvelope(double att_ms, double rel_ms, double sampleRate)
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: att_(att_ms, sampleRate)
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, rel_(rel_ms, sampleRate)
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{
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}
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//-------------------------------------------------------------
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void AttRelEnvelope::setAttack(double ms)
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{
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att_.setTc(ms);
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}
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//-------------------------------------------------------------
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void AttRelEnvelope::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 AttRelEnvelope::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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} // end namespace chunkware_simple
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