118 lines
3.7 KiB
C++
Executable File
118 lines
3.7 KiB
C++
Executable File
/*
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* Simple Limiter (header)
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*
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* File : SimpleLimit.h
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* Library : SimpleSource
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* Version : 1.12
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* Class : 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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#ifndef __SIMPLE_LIMIT_H__
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#define __SIMPLE_LIMIT_H__
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#include "SimpleHeader.h" // common header
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#include "SimpleEnvelope.h" // for base class of FastEnvelope
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#include "SimpleGain.h" // for gain functions
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#include <vector>
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namespace chunkware_simple
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{
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//-------------------------------------------------------------
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// simple limiter
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//-------------------------------------------------------------
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class SimpleLimit
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{
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public:
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SimpleLimit();
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virtual ~SimpleLimit() {}
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// parameters
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virtual void setThresh( double dB );
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virtual void setAttack( double ms );
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virtual void setRelease( double ms );
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virtual double getThresh( void ) const { return threshdB_; }
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virtual double getAttack( void ) const { return att_.getTc(); }
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virtual double getRelease( void ) const { return rel_.getTc(); }
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// latency
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virtual const unsigned int getLatency( void ) const { return peakHold_; }
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// sample rate dependencies
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virtual void setSampleRate( double sampleRate );
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virtual double getSampleRate( void ) { return att_.getSampleRate(); }
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// runtime
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virtual void initRuntime( void ); // call before runtime (in resume())
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void process( double &in1, double &in2 ); // limiter runtime process
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protected:
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// class for faster attack/release
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class FastEnvelope : public EnvelopeDetector
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{
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public:
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FastEnvelope( double ms = 1.0, double sampleRate = 44100.0 )
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: EnvelopeDetector( ms, sampleRate )
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{}
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virtual ~FastEnvelope() {}
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protected:
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// override setCoef() - coefficient calculation
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virtual void setCoef( void );
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};
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private:
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// transfer function
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double threshdB_; // threshold (dB)
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double thresh_; // threshold (linear)
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// max peak
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unsigned int peakHold_; // peak hold (samples)
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unsigned int peakTimer_; // peak hold timer
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double maxPeak_; // max peak
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// attack/release envelope
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FastEnvelope att_; // attack
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FastEnvelope rel_; // release
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double env_; // over-threshold envelope (linear)
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// buffer
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// BUFFER_SIZE default can handle up to ~10ms at 96kHz
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// change this if you require more
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static const int BUFFER_SIZE = 1024; // buffer size (always a power of 2!)
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unsigned int mask_; // buffer mask
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unsigned int cur_; // cursor
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std::vector< double > outBuffer_[ 2 ]; // output buffer
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}; // end SimpleLimit class
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} // end namespace chunkware_simple
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// include inlined process function
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#include "SimpleLimitProcess.inl"
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#endif // end __SIMPLE_LIMIT_H__
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