Genesis-Plus-GX/source/sound/eq.h

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2009-05-26 18:40:35 +02:00
//---------------------------------------------------------------------------
//
// 3 Band EQ :)
//
// EQ.H - Header file for 3 band EQ
//
// (c) Neil C / Etanza Systems / 2K6
//
// Shouts / Loves / Moans = etanza at lycos dot co dot uk
//
// This work is hereby placed in the public domain for all purposes, including
// use in commercial applications.
//
// The author assumes NO RESPONSIBILITY for any problems caused by the use of
// this software.
//
//----------------------------------------------------------------------------
#ifndef __EQ3BAND__
#define __EQ3BAND__
// ------------
//| Structures |
// ------------
typedef struct {
// Filter #1 (Low band)
double lf; // Frequency
double f1p0; // Poles ...
double f1p1;
double f1p2;
double f1p3;
// Filter #2 (High band)
double hf; // Frequency
double f2p0; // Poles ...
double f2p1;
double f2p2;
double f2p3;
// Sample history buffer
double sdm1; // Sample data minus 1
double sdm2; // 2
double sdm3; // 3
// Gain Controls
double lg; // low gain
double mg; // mid gain
double hg; // high gain
} EQSTATE;
// ---------
//| Exports |
// ---------
extern void init_3band_state(EQSTATE * es, int lowfreq, int highfreq,
int mixfreq);
extern double do_3band(EQSTATE * es, int sample);
#endif // #ifndef __EQ3BAND__