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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/genplus-gx32/core/sound/eq.h
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/*---------------------------------------------------------------------------

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//

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//                                3 Band EQ :)

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//

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// EQ.H - Header file for 3 band EQ

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//

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// (c) Neil C / Etanza Systems / 2K6

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//

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// Shouts / Loves / Moans = etanza at lycos dot co dot uk 

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//

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// This work is hereby placed in the public domain for all purposes, including

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// use in commercial applications.

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//

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// The author assumes NO RESPONSIBILITY for any problems caused by the use of

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// this software.

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//

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//----------------------------------------------------------------------------*/

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#ifndef __EQ3BAND__

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#define __EQ3BAND__

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/* ------------

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//| Structures |

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// ------------*/

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typedef struct {

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    /* Filter #1 (Low band) */

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    double lf;      /* Frequency */

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    double f1p0;      /* Poles ... */

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    double f1p1;

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    double f1p2;

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    double f1p3;

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    /* Filter #2 (High band) */

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    double hf;      /* Frequency */

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    double f2p0;      /* Poles ... */

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    double f2p1;

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    double f2p2;

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    double f2p3;

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    /* Sample history buffer */

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    double sdm1;      /* Sample data minus 1 */

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    double sdm2;      /*                   2 */

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    double sdm3;      /*                   3 */

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    /* Gain Controls */

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    double lg;      /* low  gain */

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    double mg;      /* mid  gain */

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    double hg;      /* high gain */

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} EQSTATE;

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/* ---------

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//| Exports |

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// ---------*/

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extern void init_3band_state(EQSTATE * es, int lowfreq, int highfreq,

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           int mixfreq);

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extern double do_3band(EQSTATE * es, int sample);

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#endif        /* #ifndef __EQ3BAND__ */

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