/*---------------------------------------------------------------------*
 *                                                                     *
 * THIS IS AN UNPUBLISHED WORK CONTAINING CONFIDENTIAL AND PROPRIETARY *
 * INFORMATION.  IF PUBLICATION OCCURS, THE FOLLOWING NOTICE APPLIES:  *
 *     "COPYRIGHT 2001 MICHAEL TSIROULNIKOV, ALL RIGHTS RESERVED"      *
 *                                                                     *
 *---------------------------------------------------------------------*/

#ifndef _tg_h 
#define _tg_h 1

#include "stddefs.h"

/*--------------------- local defs ------------------------------------*/

/* !!! DO NOT CHANGE TG_tTone STRUCTURE !!! (or correct tga.asm) */
typedef struct TG_tTone
{
    S16 sPhase;
	S16 sAmp;
	S16 sFreq; /* 32768 -> 4000 Hz, 1/2 of sampling freq */
} TG_tTone;

enum
{
	TG_ST_IDLE = 0,
	TG_ST_PRE_SILENCE,
	TG_ST_SIGNAL,
	TG_ST_POST_SILENCE,

    TG_ST_MAX
};

#define TG_CMD_NONE  (0)
#define TG_CMD_RESET (1)
#define TG_CMD_TONE  (2)

typedef struct TG_tCfg {
    S16 sCmd;
    S16 sPreSilenceDuration;
    S16 sSignalDuration;
    S16 sPostSilenceDuration;
    TG_tTone Lo;
    TG_tTone Hi;

} TG_tCfg;

typedef struct TG_tDb
{
	S16 sState;
    S16 sCurrFrame;

    TG_tCfg Cfg;

    TG_tTone Lo;
    TG_tTone Hi;

} TG_tDb;

typedef TG_tDb TG_tScratch;

/*--------------------- public vars -----------------------------------*/
/*--------------------- local vars ------------------------------------*/
/*--------------------- local functions -------------------------------*/
/*--------------------- public  functions -----------------------------*/

extern void* TG_create(TG_tDb *pFrom);

extern void  TG_init   (TG_tDb *pDb);

extern void  TG_control(TG_tDb *pDb, TG_tCfg *pCfg);

/* returns state. no pIn */
extern S16  TG_process(TG_tDb *pDb, TG_tScratch *pScratch, S16 *pOut);


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

#endif /* _tg_h */