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-rw-r--r--alc/mastering.h103
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diff --git a/alc/mastering.h b/alc/mastering.h
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-#ifndef MASTERING_H
-#define MASTERING_H
-
-#include <memory>
-
-#include "AL/al.h"
-
-/* For FloatBufferLine/BUFFERSIZE. */
-#include "alcmain.h"
-#include "almalloc.h"
-
-struct SlidingHold;
-
-
-/* General topology and basic automation was based on the following paper:
- *
- * D. Giannoulis, M. Massberg and J. D. Reiss,
- * "Parameter Automation in a Dynamic Range Compressor,"
- * Journal of the Audio Engineering Society, v61 (10), Oct. 2013
- *
- * Available (along with supplemental reading) at:
- *
- * http://c4dm.eecs.qmul.ac.uk/audioengineering/compressors/
- */
-struct Compressor {
- ALuint mNumChans{0u};
-
- struct {
- bool Knee : 1;
- bool Attack : 1;
- bool Release : 1;
- bool PostGain : 1;
- bool Declip : 1;
- } mAuto{};
-
- ALuint mLookAhead{0};
-
- ALfloat mPreGain{0.0f};
- ALfloat mPostGain{0.0f};
-
- ALfloat mThreshold{0.0f};
- ALfloat mSlope{0.0f};
- ALfloat mKnee{0.0f};
-
- ALfloat mAttack{0.0f};
- ALfloat mRelease{0.0f};
-
- alignas(16) ALfloat mSideChain[2*BUFFERSIZE]{};
- alignas(16) ALfloat mCrestFactor[BUFFERSIZE]{};
-
- SlidingHold *mHold{nullptr};
- FloatBufferLine *mDelay{nullptr};
-
- ALfloat mCrestCoeff{0.0f};
- ALfloat mGainEstimate{0.0f};
- ALfloat mAdaptCoeff{0.0f};
-
- ALfloat mLastPeakSq{0.0f};
- ALfloat mLastRmsSq{0.0f};
- ALfloat mLastRelease{0.0f};
- ALfloat mLastAttack{0.0f};
- ALfloat mLastGainDev{0.0f};
-
-
- ~Compressor();
- void process(const ALuint SamplesToDo, FloatBufferLine *OutBuffer);
- ALsizei getLookAhead() const noexcept { return static_cast<ALsizei>(mLookAhead); }
-
- DEF_PLACE_NEWDEL()
-};
-
-/* The compressor is initialized with the following settings:
- *
- * NumChans - Number of channels to process.
- * SampleRate - Sample rate to process.
- * AutoKnee - Whether to automate the knee width parameter.
- * AutoAttack - Whether to automate the attack time parameter.
- * AutoRelease - Whether to automate the release time parameter.
- * AutoPostGain - Whether to automate the make-up (post) gain parameter.
- * AutoDeclip - Whether to automate clipping reduction. Ignored when
- * not automating make-up gain.
- * LookAheadTime - Look-ahead time (in seconds).
- * HoldTime - Peak hold-time (in seconds).
- * PreGainDb - Gain applied before detection (in dB).
- * PostGainDb - Make-up gain applied after compression (in dB).
- * ThresholdDb - Triggering threshold (in dB).
- * Ratio - Compression ratio (x:1). Set to INFINIFTY for true
- * limiting. Ignored when automating knee width.
- * KneeDb - Knee width (in dB). Ignored when automating knee
- * width.
- * AttackTimeMin - Attack time (in seconds). Acts as a maximum when
- * automating attack time.
- * ReleaseTimeMin - Release time (in seconds). Acts as a maximum when
- * automating release time.
- */
-std::unique_ptr<Compressor> CompressorInit(const ALuint NumChans, const ALfloat SampleRate,
- const ALboolean AutoKnee, const ALboolean AutoAttack, const ALboolean AutoRelease,
- const ALboolean AutoPostGain, const ALboolean AutoDeclip, const ALfloat LookAheadTime,
- const ALfloat HoldTime, const ALfloat PreGainDb, const ALfloat PostGainDb,
- const ALfloat ThresholdDb, const ALfloat Ratio, const ALfloat KneeDb, const ALfloat AttackTime,
- const ALfloat ReleaseTime);
-
-#endif /* MASTERING_H */