221 lines
7.0 KiB
C++
221 lines
7.0 KiB
C++
/*
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* Reverb.h
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* --------
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* Purpose: Mixing code for reverb.
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* Notes : Ugh... This should really be removed at some point.
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* Authors: Olivier Lapicque
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* OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "openmpt/all/BuildSettings.hpp"
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#ifndef NO_REVERB
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#include "../soundlib/Mixer.h" // For MIXBUFFERSIZE
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OPENMPT_NAMESPACE_BEGIN
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////////////////////////////////////////////////////////////////////////
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// Reverberation
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/////////////////////////////////////////////////////////////////////////////
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//
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// SW Reverb structures
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//
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// Length-1 (in samples) of the reflections delay buffer: 32K, 371ms@22kHz
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#define SNDMIX_REFLECTIONS_DELAY_MASK 0x1fff
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#define SNDMIX_PREDIFFUSION_DELAY_MASK 0x7f // 128 samples
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#define SNDMIX_REVERB_DELAY_MASK 0xfff // 4K samples (92ms @ 44kHz)
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union LR16
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{
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struct { int16 l, r; } c;
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int32 lr;
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};
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struct SWRvbReflection
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{
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uint32 Delay, DelayDest;
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LR16 Gains[2]; // g_ll, g_rl, g_lr, g_rr
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};
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struct SWRvbRefDelay
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{
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uint32 nDelayPos, nPreDifPos, nRefOutPos;
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int32 lMasterGain; // reflections linear master gain
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LR16 nCoeffs; // room low-pass coefficients
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LR16 History; // room low-pass history
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LR16 nPreDifCoeffs; // prediffusion coefficients
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LR16 ReflectionsGain; // master reflections gain
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SWRvbReflection Reflections[8]; // Up to 8 SW Reflections
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LR16 RefDelayBuffer[SNDMIX_REFLECTIONS_DELAY_MASK + 1]; // reflections delay buffer
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LR16 PreDifBuffer[SNDMIX_PREDIFFUSION_DELAY_MASK + 1]; // pre-diffusion
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LR16 RefOut[SNDMIX_REVERB_DELAY_MASK + 1]; // stereo output of reflections
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};
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struct SNDMIX_REVERB_PROPERTIES;
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// Late reverberation
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// Tank diffusers lengths
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#define RVBDIF1L_LEN (149*2) // 6.8ms
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#define RVBDIF1R_LEN (223*2) // 10.1ms
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#define RVBDIF2L_LEN (421*2) // 19.1ms
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#define RVBDIF2R_LEN (647*2) // 29.3ms
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// Tank delay lines lengths
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#define RVBDLY1L_LEN (683*2) // 30.9ms
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#define RVBDLY1R_LEN (811*2) // 36.7ms
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#define RVBDLY2L_LEN (773*2) // 35.1ms
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#define RVBDLY2R_LEN (1013*2) // 45.9ms
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// Tank delay lines mask
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#define RVBDLY_MASK 2047
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// Min/Max reflections delay
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#define RVBMINREFDELAY 96 // 96 samples
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#define RVBMAXREFDELAY 7500 // 7500 samples
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// Min/Max reverb delay
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#define RVBMINRVBDELAY 128 // 256 samples (11.6ms @ 22kHz)
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#define RVBMAXRVBDELAY 3800 // 1900 samples (86ms @ 24kHz)
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struct SWLateReverb
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{
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uint32 nReverbDelay; // Reverb delay (in samples)
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uint32 nDelayPos; // Delay line position
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LR16 nDifCoeffs[2]; // Reverb diffusion
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LR16 nDecayDC[2]; // Reverb DC decay
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LR16 nDecayLP[2]; // Reverb HF decay
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LR16 LPHistory[2]; // Low-pass history
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LR16 Dif2InGains[2]; // 2nd diffuser input gains
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LR16 RvbOutGains[2]; // 4x2 Reverb output gains
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int32 lMasterGain; // late reverb master gain
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int32 lDummyAlign;
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// Tank Delay lines
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LR16 Diffusion1[RVBDLY_MASK + 1]; // {dif1_l, dif1_r}
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LR16 Diffusion2[RVBDLY_MASK + 1]; // {dif2_l, dif2_r}
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LR16 Delay1[RVBDLY_MASK + 1]; // {dly1_l, dly1_r}
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LR16 Delay2[RVBDLY_MASK + 1]; // {dly2_l, dly2_r}
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};
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#define ENVIRONMENT_NUMREFLECTIONS 8
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struct EnvironmentReflection
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{
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int16 GainLL, GainRR, GainLR, GainRL; // +/- 32K scale
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uint32 Delay; // In samples
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};
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struct EnvironmentReverb
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{
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int32 ReverbLevel; // Late reverb gain (mB)
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int32 ReflectionsLevel; // Master reflections gain (mB)
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int32 RoomHF; // Room gain HF (mB)
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uint32 ReverbDecay; // Reverb tank decay (0-7fff scale)
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int32 PreDiffusion; // Reverb pre-diffusion amount (+/- 32K scale)
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int32 TankDiffusion; // Reverb tank diffusion (+/- 32K scale)
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uint32 ReverbDelay; // Reverb delay (in samples)
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float flReverbDamping; // HF tank gain [0.0, 1.0]
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int32 ReverbDecaySamples; // Reverb decay time (in samples)
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EnvironmentReflection Reflections[ENVIRONMENT_NUMREFLECTIONS];
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};
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class CReverbSettings
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{
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public:
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uint32 m_nReverbDepth = 8; // 50%
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uint32 m_nReverbType = 0;
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};
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class CReverb
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{
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public:
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CReverbSettings m_Settings;
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private:
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const SNDMIX_REVERB_PROPERTIES *m_currentPreset = nullptr;
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bool gnReverbSend = false;
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uint32 gnReverbSamples = 0;
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uint32 gnReverbDecaySamples = 0;
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// Internal reverb state
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bool g_bLastInPresent = 0;
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bool g_bLastOutPresent = 0;
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int g_nLastRvbIn_xl = 0;
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int g_nLastRvbIn_xr = 0;
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int g_nLastRvbIn_yl = 0;
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int g_nLastRvbIn_yr = 0;
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int g_nLastRvbOut_xl = 0;
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int g_nLastRvbOut_xr = 0;
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int32 gnDCRRvb_Y1[2] = { 0, 0 };
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int32 gnDCRRvb_X1[2] = { 0, 0 };
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// Reverb mix buffers
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SWRvbRefDelay g_RefDelay;
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SWLateReverb g_LateReverb;
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public:
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CReverb();
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public:
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void Initialize(bool bReset, MixSampleInt &gnRvbROfsVol, MixSampleInt &gnRvbLOfsVol, uint32 MixingFreq);
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// can be called multiple times or never (if no data is sent to reverb)
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void TouchReverbSendBuffer(MixSampleInt *MixReverbBuffer, MixSampleInt &gnRvbROfsVol, MixSampleInt &gnRvbLOfsVol, uint32 nSamples);
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// call once after all data has been sent.
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void Process(MixSampleInt *MixSoundBuffer, MixSampleInt *MixReverbBuffer, MixSampleInt &gnRvbROfsVol, MixSampleInt &gnRvbLOfsVol, uint32 nSamples);
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private:
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void Shutdown(MixSampleInt &gnRvbROfsVol, MixSampleInt &gnRvbLOfsVol);
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// Pre/Post resampling and filtering
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uint32 ReverbProcessPreFiltering1x(int32 *pWet, uint32 nSamples);
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uint32 ReverbProcessPreFiltering2x(int32 *pWet, uint32 nSamples);
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void ReverbProcessPostFiltering1x(const int32 *pRvb, int32 *pDry, uint32 nSamples);
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void ReverbProcessPostFiltering2x(const int32 *pRvb, int32 *pDry, uint32 nSamples);
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void ReverbDCRemoval(int32 *pBuffer, uint32 nSamples);
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void ReverbDryMix(int32 *pDry, int32 *pWet, int lDryVol, uint32 nSamples);
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// Process pre-diffusion and pre-delay
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static void ProcessPreDelay(SWRvbRefDelay *pPreDelay, const int32 *pIn, uint32 nSamples);
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// Process reflections
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static void ProcessReflections(SWRvbRefDelay *pPreDelay, LR16 *pRefOut, int32 *pMixOut, uint32 nSamples);
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// Process Late Reverb (SW Reflections): stereo reflections output, 32-bit reverb output, SW reverb gain
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static void ProcessLateReverb(SWLateReverb *pReverb, LR16 *pRefOut, int32 *pMixOut, uint32 nSamples);
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};
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/////////////////////////////////////////////////////////////////////////////////
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//
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// I3DL2 reverb presets
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//
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struct SNDMIX_REVERB_PROPERTIES
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{
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int32 lRoom; // [-10000, 0] default: -10000 mB
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int32 lRoomHF; // [-10000, 0] default: 0 mB
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float flDecayTime; // [0.1, 20.0] default: 1.0 s
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float flDecayHFRatio; // [0.1, 2.0] default: 0.5
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int32 lReflections; // [-10000, 1000] default: -10000 mB
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float flReflectionsDelay; // [0.0, 0.3] default: 0.02 s
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int32 lReverb; // [-10000, 2000] default: -10000 mB
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float flReverbDelay; // [0.0, 0.1] default: 0.04 s
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float flDiffusion; // [0.0, 100.0] default: 100.0 %
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float flDensity; // [0.0, 100.0] default: 100.0 %
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};
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enum : uint32
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{
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NUM_REVERBTYPES = 29
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};
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mpt::ustring GetReverbPresetName(uint32 preset);
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const SNDMIX_REVERB_PROPERTIES *GetReverbPreset(uint32 preset);
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OPENMPT_NAMESPACE_END
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#endif // NO_REVERB
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