🛠️🐜 Antkeeper superbuild with dependencies included
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107 lines
3.4 KiB
107 lines
3.4 KiB
#ifndef MASTERING_H
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#define MASTERING_H
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#include <memory>
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#include "AL/al.h"
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#include "almalloc.h"
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/* For BUFFERSIZE. */
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#include "alMain.h"
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struct SlidingHold;
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/* General topology and basic automation was based on the following paper:
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*
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* D. Giannoulis, M. Massberg and J. D. Reiss,
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* "Parameter Automation in a Dynamic Range Compressor,"
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* Journal of the Audio Engineering Society, v61 (10), Oct. 2013
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*
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* Available (along with supplemental reading) at:
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*
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* http://c4dm.eecs.qmul.ac.uk/audioengineering/compressors/
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*/
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struct Compressor {
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ALsizei mNumChans{0};
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ALuint mSampleRate{0u};
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struct {
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bool Knee : 1;
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bool Attack : 1;
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bool Release : 1;
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bool PostGain : 1;
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bool Declip : 1;
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} mAuto{};
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ALsizei mLookAhead{0};
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ALfloat mPreGain{0.0f};
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ALfloat mPostGain{0.0f};
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ALfloat mThreshold{0.0f};
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ALfloat mSlope{0.0f};
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ALfloat mKnee{0.0f};
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ALfloat mAttack{0.0f};
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ALfloat mRelease{0.0f};
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alignas(16) ALfloat mSideChain[2*BUFFERSIZE]{};
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alignas(16) ALfloat mCrestFactor[BUFFERSIZE]{};
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SlidingHold *mHold{nullptr};
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ALfloat (*mDelay)[BUFFERSIZE]{nullptr};
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ALsizei mDelayIndex{0};
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ALfloat mCrestCoeff{0.0f};
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ALfloat mGainEstimate{0.0f};
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ALfloat mAdaptCoeff{0.0f};
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ALfloat mLastPeakSq{0.0f};
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ALfloat mLastRmsSq{0.0f};
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ALfloat mLastRelease{0.0f};
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ALfloat mLastAttack{0.0f};
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ALfloat mLastGainDev{0.0f};
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~Compressor();
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void process(const ALsizei SamplesToDo, ALfloat (*OutBuffer)[BUFFERSIZE]);
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ALsizei getLookAhead() const noexcept { return mLookAhead; }
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DEF_PLACE_NEWDEL()
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};
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/* The compressor is initialized with the following settings:
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*
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* NumChans - Number of channels to process.
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* SampleRate - Sample rate to process.
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* AutoKnee - Whether to automate the knee width parameter.
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* AutoAttack - Whether to automate the attack time parameter.
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* AutoRelease - Whether to automate the release time parameter.
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* AutoPostGain - Whether to automate the make-up (post) gain parameter.
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* AutoDeclip - Whether to automate clipping reduction. Ignored when
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* not automating make-up gain.
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* LookAheadTime - Look-ahead time (in seconds).
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* HoldTime - Peak hold-time (in seconds).
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* PreGainDb - Gain applied before detection (in dB).
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* PostGainDb - Make-up gain applied after compression (in dB).
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* ThresholdDb - Triggering threshold (in dB).
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* Ratio - Compression ratio (x:1). Set to INFINIFTY for true
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* limiting. Ignored when automating knee width.
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* KneeDb - Knee width (in dB). Ignored when automating knee
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* width.
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* AttackTimeMin - Attack time (in seconds). Acts as a maximum when
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* automating attack time.
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* ReleaseTimeMin - Release time (in seconds). Acts as a maximum when
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* automating release time.
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*/
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std::unique_ptr<Compressor> CompressorInit(const ALsizei NumChans, const ALuint SampleRate,
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const ALboolean AutoKnee, const ALboolean AutoAttack,
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const ALboolean AutoRelease, const ALboolean AutoPostGain,
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const ALboolean AutoDeclip, const ALfloat LookAheadTime,
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const ALfloat HoldTime, const ALfloat PreGainDb,
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const ALfloat PostGainDb, const ALfloat ThresholdDb,
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const ALfloat Ratio, const ALfloat KneeDb,
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const ALfloat AttackTime, const ALfloat ReleaseTime);
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#endif /* MASTERING_H */
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