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#pragma once

#ifndef __YMDELTAT_H__
#define __YMDELTAT_H__

#define YM_DELTAT_SHIFT    (16)

#define YM_DELTAT_EMULATION_MODE_NORMAL 0
#define YM_DELTAT_EMULATION_MODE_YM2610 1


typedef void (*STATUS_CHANGE_HANDLER)(void *chip, UINT8 status_bits);


/* DELTA-T (adpcm type B) struct */
struct YM_DELTAT  {     /* AT: rearranged and tigntened structure */
	UINT8   *memory;
	INT32   *output_pointer;/* pointer of output pointers   */
	INT32   *pan;           /* pan : &output_pointer[pan]   */
	double  freqbase;
#if 0
	double  write_time;     /* Y8950: 10 cycles of main clock; YM2608: 20 cycles of main clock */
	double  read_time;      /* Y8950: 8 cycles of main clock;  YM2608: 18 cycles of main clock */
#endif
	UINT32  memory_size;
	int     output_range;
	UINT32  now_addr;       /* current address      */
	UINT32  now_step;       /* currect step         */
	UINT32  step;           /* step                 */
	UINT32  start;          /* start address        */
	UINT32  limit;          /* limit address        */
	UINT32  end;            /* end address          */
	UINT32  delta;          /* delta scale          */
	INT32   volume;         /* current volume       */
	INT32   acc;            /* shift Measurement value*/
	INT32   adpcmd;         /* next Forecast        */
	INT32   adpcml;         /* current value        */
	INT32   prev_acc;       /* leveling value       */
	UINT8   now_data;       /* current rom data     */
	UINT8   CPU_data;       /* current data from reg 08 */
	UINT8   portstate;      /* port status          */
	UINT8   control2;       /* control reg: SAMPLE, DA/AD, RAM TYPE (x8bit / x1bit), ROM/RAM */
	UINT8   portshift;      /* address bits shift-left:
                            ** 8 for YM2610,
                            ** 5 for Y8950 and YM2608 */

	UINT8   DRAMportshift;  /* address bits shift-right:
                            ** 0 for ROM and x8bit DRAMs,
                            ** 3 for x1 DRAMs */

	UINT8   memread;        /* needed for reading/writing external memory */

	/* handlers and parameters for the status flags support */
	STATUS_CHANGE_HANDLER   status_set_handler;
	STATUS_CHANGE_HANDLER   status_reset_handler;

	/* note that different chips have these flags on different
	** bits of the status register
	*/
	void *  status_change_which_chip;   /* this chip id */
	UINT8   status_change_EOS_bit;      /* 1 on End Of Sample (record/playback/cycle time of AD/DA converting has passed)*/
	UINT8   status_change_BRDY_bit;     /* 1 after recording 2 datas (2x4bits) or after reading/writing 1 data */
	UINT8   status_change_ZERO_bit;     /* 1 if silence lasts for more than 290 miliseconds on ADPCM recording */

	/* neither Y8950 nor YM2608 can generate IRQ when PCMBSY bit changes, so instead of above,
	** the statusflag gets ORed with PCM_BSY (below) (on each read of statusflag of Y8950 and YM2608)
	*/
	UINT8   PCM_BSY;        /* 1 when ADPCM is playing; Y8950/YM2608 only */

	UINT8   reg[16];        /* adpcm registers      */
	UINT8   emulation_mode; /* which chip we're emulating */
};

/*void YM_DELTAT_BRDY_callback(YM_DELTAT *DELTAT);*/

UINT8 YM_DELTAT_ADPCM_Read(YM_DELTAT *DELTAT);
void YM_DELTAT_ADPCM_Write(YM_DELTAT *DELTAT,int r,int v);
void YM_DELTAT_ADPCM_Reset(YM_DELTAT *DELTAT,int pan,int emulation_mode);
void YM_DELTAT_ADPCM_CALC(YM_DELTAT *DELTAT);

void YM_DELTAT_postload(YM_DELTAT *DELTAT,UINT8 *regs);
void YM_DELTAT_savestate(device_t *device,YM_DELTAT *DELTAT);

#endif /* __YMDELTAT_H__ */