203 lines
6.7 KiB
C
203 lines
6.7 KiB
C
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/******************************************************************************
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* ReverbFX.h *
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*-------------*
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* This is the header file for the CReverbFX implementation.
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*------------------------------------------------------------------------------
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* Copyright (C) 1999 Microsoft Corporation Date: 03/01/99
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* All Rights Reserved
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*
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*********************************************************************** MC ****/
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#ifndef ReverbFX_H
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#define ReverbFX_H
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#ifndef __spttseng_h__
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#include "spttseng.h"
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#endif
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//-------------------------------------------------------------
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// Comment-out line below if you want
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// integer math instead of floating point.
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//
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// NOTE:
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// Bathtub preset probably won't work
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// using integer math (overflow)
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//-------------------------------------------------------------
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#define FLOAT_REVERB 1
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#ifdef FLOAT_REVERB
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#define REVERBT float
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#define REVERBL float
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#else
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#define REVERBT short
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#define REVERBL long
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#endif
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#ifdef FLOAT_REVERB
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static const float REVERB_VOL_OFF = 0.0;
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static const float REVERB_VOL_UNITY = 1.0f;
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static const float REVERB_MIN_MIX = 0.001f;
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#else
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static const long REVERB_VOL_SHIFT = (16);
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static const long REVERB_VOL_LEVELS = 65536;
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static const long REVERB_VOL_OFF = 0;
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static const long REVERB_VOL_UNITY = REVERB_VOL_LEVELS;
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#endif
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static const float REVERB_MIN_DB = (-110.0);
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static const long KMAXREVBMODS = 5;
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static const long KWORKBUFLEN = 1024;
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//-------------------------------------
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// Reverb preset parametrs
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//-------------------------------------
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struct REVERBCONFIG
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{
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float wetGain_dB; // WET gain (db)
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float dryGain_dB; // DRY gain (db)
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short numOfReflect; // Number of modules
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float *gain_ms_Array; // Array of delay values (ms)
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float *gain_dB_Array; // Array of gain values (db)
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float seqIndex; // "sequencer" fx
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};
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typedef struct REVERBCONFIG REVERBCONFIG, *LPREVERBCONFIG;
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struct Reverb_Mod
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{
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REVERBL lGain; // Gain of the amplifiers.
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long dwDelay; // Length of the delay line.
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long dwDelayBufferSize; // Size of the delay buffer.
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REVERBT *psDelayBuffer; // Circular delay buffer, length dwDelay.
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REVERBT *psDelayIn; // Current input position in the delay.
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REVERBT *psDelayOut; // Current output position in the delay.
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REVERBT *psDelayEnd; // Location immediately following the buffer.
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};
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typedef struct Reverb_Mod Reverb_Mod, *LP_Reverb_Mod;
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//----------------------------------
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// Reverb error codes
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//----------------------------------
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static const long KREVERB_NOERROR = 0;
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static const long KREVERB_MEMERROR = 1;
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static const long KREVERB_OFF = 2;
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//-----------------------------------------
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// ReverbFX Class
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//-----------------------------------------
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class CReverbFX
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{
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public:
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//----------------------------------
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// Initialization functions
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//----------------------------------
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CReverbFX( void );
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~CReverbFX( void );
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short Reverb_Init
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(
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REVERBTYPE reverbPreset, // Configuration preset
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long nSamplesPerSec, // SampleRate
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long stereoOut // true = output is stero
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);
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private:
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REVERBL DecibelToPercent( float flDecibel );
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void ClearReverb( LP_Reverb_Mod mod );
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short AllocReverbModule
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(
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LP_Reverb_Mod mod,
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REVERBL lGain, // Gain of the amplifiers.
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long dwDelay, // Length of the delay line.
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long dwDelayBufferSize // Size of the delay buffer.
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);
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short CreateReverbModules
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(
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short wModules, // Number of modules to create.
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LP_Reverb_Mod *mods,
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float * pfltDelay, // Array of delay values for the modules.
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float * pfltDB, // Array of gain values for the modules.
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float fltSamplesPerMS // Number of samples per millisecond.
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);
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void DeleteReverbModules ();
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LPREVERBCONFIG GetReverbConfig( REVERBTYPE dwReverbConfig );
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//----------------------------------
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// Run-time
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//----------------------------------
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void CopyWithGain
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(
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REVERBT *psDest,
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REVERBT *psSource,
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long dwSamples,
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REVERBL gain
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);
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void MixWithGain_STEREO
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(
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REVERBT *pWet,
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REVERBT *pDry,
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short *pDest,
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long dwSamples,
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REVERBL gain
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);
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void MixWithGain_MONO
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(
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REVERBT *pWet,
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REVERBT *pDry,
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short *pDest,
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long dwSamples,
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REVERBL gain
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);
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void ProcessReverbModule
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(
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LP_Reverb_Mod mod,
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long dwDestSamples, // Number of samples to process.
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REVERBT *pSource, // Source sample buffer.
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REVERBT *pDestination // Destination sample buffer.
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);
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void ProcessReverbBuffer
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(
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REVERBT *psSample, // Samples to process (in/out).
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long wSamples, // Number of samples to process.
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LP_Reverb_Mod *mods // Array of modules to apply.
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);
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public:
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short Reverb_Process( float *sampleBuffer, long dwSamplesRemaining, float audioGain );
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private:
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//----------------------------------
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// Member Variables
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//----------------------------------
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long m_StereoOut;
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long m_dwWorkBufferSize;
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REVERBT *m_pWorkBuf;
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REVERBL m_wetVolGain;
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REVERBL m_dryVolGain;
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long m_numOfMods;
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LP_Reverb_Mod m_Reverb_Mods[KMAXREVBMODS];
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LPREVERBCONFIG m_pReverbConfig;
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float m_Count;
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float m_LenScale;
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};
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typedef CReverbFX *LP_CReverbFX;
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#endif //--- This must be the last line in the file
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