65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/**
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* @author Bojan MARKOVIC
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* @author Edouard DUPIN
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* @copyright 2006, ChunkWare Music Software, OPEN-SOURCE
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* @license BSD-1 (see license file)
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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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#pragma once
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#include <etk/types.hpp>
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namespace audio {
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namespace algo {
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namespace chunkware {
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// USE:
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// 1. init envelope state to DC_OFFSET before processing
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// 2. add to input before envelope runtime function
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static const double DC_OFFSET = 1.0E-25;
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class EnvelopeDetector {
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public:
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EnvelopeDetector(double _ms = 1.0,
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double _sampleRate = 44100.0);
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virtual ~EnvelopeDetector() {}
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// time constant
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virtual void setTc(double _ms);
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virtual double getTc() const {
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return m_timeMs;
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}
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// sample rate
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virtual void setSampleRate(double _sampleRate);
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virtual double getSampleRate() const {
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return m_sampleRate;
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}
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// runtime function
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void run(double _in, double& _state) {
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_state = _in + m_coefficient * (_state - _in);
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}
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protected:
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double m_sampleRate; //!< sample rate
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double m_timeMs; //!< time constant in ms
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double m_coefficient; //!< runtime coefficient
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virtual void setCoef(); //!< coef calculation
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};
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}
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}
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}
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