131 lines
3.8 KiB
C++
Executable File
131 lines
3.8 KiB
C++
Executable File
/*
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* Simple Envelope Detectors (header)
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*
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* File : SimpleEnvelope.h
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* Library : SimpleSource
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* Version : 1.12
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* Class : 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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#ifndef __SIMPLE_ENVELOPE_H__
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#define __SIMPLE_ENVELOPE_H__
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#include "SimpleHeader.h" // common header
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namespace chunkware_simple
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{
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//-------------------------------------------------------------
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// DC offset (to prevent denormal)
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//-------------------------------------------------------------
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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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//-------------------------------------------------------------
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// envelope detector
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//-------------------------------------------------------------
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class EnvelopeDetector
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{
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public:
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EnvelopeDetector(
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double ms = 1.0
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, double sampleRate = 44100.0
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);
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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( void ) const { return ms_; }
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// sample rate
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virtual void setSampleRate( double sampleRate );
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virtual double getSampleRate( void ) const { return sampleRate_; }
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// runtime function
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INLINE void run( double in, double &state ) {
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state = in + coef_ * ( state - in );
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}
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protected:
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double sampleRate_; // sample rate
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double ms_; // time constant in ms
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double coef_; // runtime coefficient
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virtual void setCoef( void ); // coef calculation
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}; // end SimpleComp class
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//-------------------------------------------------------------
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// attack/release envelope
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//-------------------------------------------------------------
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class AttRelEnvelope
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{
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public:
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AttRelEnvelope(
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double att_ms = 10.0
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, double rel_ms = 100.0
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, double sampleRate = 44100.0
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);
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virtual ~AttRelEnvelope() {}
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// attack time constant
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virtual void setAttack( double ms );
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virtual double getAttack( void ) const { return att_.getTc(); }
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// release time constant
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virtual void setRelease( double ms );
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virtual double getRelease( void ) const { return rel_.getTc(); }
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// sample rate dependencies
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virtual void setSampleRate( double sampleRate );
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virtual double getSampleRate( void ) const { return att_.getSampleRate(); }
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// runtime function
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INLINE void run( double in, double &state ) {
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/* assumes that:
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* positive delta = attack
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* negative delta = release
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* good for linear & log values
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*/
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if ( in > state )
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att_.run( in, state ); // attack
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else
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rel_.run( in, state ); // release
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}
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private:
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EnvelopeDetector att_;
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EnvelopeDetector rel_;
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}; // end AttRelEnvelope class
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} // end namespace chunkware_simple
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#endif // end __SIMPLE_ENVELOPE_H__
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