107 lines
3.7 KiB
C++
107 lines
3.7 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 <etk/types.h>
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#include <audio/algo/chunkware/AttRelEnvelope.h>
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#include <audio/algo/chunkware/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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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 m_threshdB;
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}
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virtual double getAttack() const {
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return m_attack.getTc();
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}
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virtual double getRelease() const {
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return m_release.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 m_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 m_attack.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 audio::algo::chunkware::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 m_threshdB; //!< threshold (dB)
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double m_threshold; //!< threshold (linear)
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// max peak
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unsigned int m_peakHold; //!< peak hold (samples)
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unsigned int m_peakTimer; //!< peak hold timer
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double m_maxPeak; //!< max peak
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// attack/release envelope
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audio::algo::chunkware::Limiter::FastEnvelope m_attack; //!< attack
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audio::algo::chunkware::Limiter::FastEnvelope m_release; //!< release
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double m_overThresholdEnvelope; //!< 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 m_bufferMask; //!< buffer mask
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unsigned int m_cursor; //!< cursor
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std::vector< double > m_outputBuffer[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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