110 lines
3.6 KiB
C++
110 lines
3.6 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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#ifndef __AUDIO_ALGO_CHUNKWARE_LIMITER_H__
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#define __AUDIO_ALGO_CHUNKWARE_LIMITER_H__
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#include "header.h"
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#include "AttRelEnvelope.h"
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#include "Gain.h"
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#include <vector>
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namespace audio {
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namespace algo {
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namespace chunkware {
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//-------------------------------------------------------------
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// simple limiter
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//-------------------------------------------------------------
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class Limiter {
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public:
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Limiter();
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virtual ~Limiter() {}
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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() const {
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return threshdB_;
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}
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virtual double getAttack() const {
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return att_.getTc();
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}
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virtual double getRelease() const {
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return rel_.getTc();
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}
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// latency
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virtual const unsigned int getLatency() const {
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return peakHold_;
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}
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// sample rate dependencies
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virtual void setSampleRate(double sampleRate);
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virtual double getSampleRate() {
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return att_.getSampleRate();
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}
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// runtime
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// call before runtime (in resume())
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virtual void initRuntime();
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// limiter runtime process
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void process(double &in1, double &in2);
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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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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();
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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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};
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}
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}
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}
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#endif
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