1 #ifndef __YMDELTAT_H_ 2 #define __YMDELTAT_H_ 3 4 #define YM_DELTAT_SHIFT (16) 5 6 #define YM_DELTAT_EMULATION_MODE_NORMAL 0 7 #define YM_DELTAT_EMULATION_MODE_YM2610 1 8 9 10 typedef void (*STATUS_CHANGE_HANDLER)(UINT8 which_chip, UINT8 status_bits); 11 12 13 /* DELTA-T (adpcm type B) struct */ 14 typedef struct deltat_adpcm_state { /* AT: rearranged and tigntened structure */ 15 UINT8 *memory; 16 INT32 *output_pointer;/* pointer of output pointers */ 17 INT32 *pan; /* pan : &output_pointer[pan] */ 18 double freqbase; 19 #if 0 20 double write_time; /* Y8950: 10 cycles of main clock; YM2608: 20 cycles of main clock */ 21 double read_time; /* Y8950: 8 cycles of main clock; YM2608: 18 cycles of main clock */ 22 #endif 23 UINT32 memory_size; 24 int output_range; 25 UINT32 now_addr; /* current address */ 26 UINT32 now_step; /* currect step */ 27 UINT32 step; /* step */ 28 UINT32 start; /* start address */ 29 UINT32 limit; /* limit address */ 30 UINT32 end; /* end address */ 31 UINT32 delta; /* delta scale */ 32 INT32 volume; /* current volume */ 33 INT32 acc; /* shift Measurement value*/ 34 INT32 adpcmd; /* next Forecast */ 35 INT32 adpcml; /* current value */ 36 INT32 prev_acc; /* leveling value */ 37 UINT8 now_data; /* current rom data */ 38 UINT8 CPU_data; /* current data from reg 08 */ 39 UINT8 portstate; /* port status */ 40 UINT8 control2; /* control reg: SAMPLE, DA/AD, RAM TYPE (x8bit / x1bit), ROM/RAM */ 41 UINT8 portshift; /* address bits shift-left: 42 ** 8 for YM2610, 43 ** 5 for Y8950 and YM2608 */ 44 45 UINT8 DRAMportshift; /* address bits shift-right: 46 ** 0 for ROM and x8bit DRAMs, 47 ** 3 for x1 DRAMs */ 48 49 UINT8 memread; /* needed for reading/writing external memory */ 50 51 /* handlers and parameters for the status flags support */ 52 STATUS_CHANGE_HANDLER status_set_handler; 53 STATUS_CHANGE_HANDLER status_reset_handler; 54 55 /* note that different chips have these flags on different 56 ** bits of the status register 57 */ 58 UINT8 status_change_which_chip; /* this chip id */ 59 UINT8 status_change_EOS_bit; /* 1 on End Of Sample (record/playback/cycle time of AD/DA converting has passed)*/ 60 UINT8 status_change_BRDY_bit; /* 1 after recording 2 datas (2x4bits) or after reading/writing 1 data */ 61 UINT8 status_change_ZERO_bit; /* 1 if silence lasts for more than 290 miliseconds on ADPCM recording */ 62 63 /* neither Y8950 nor YM2608 can generate IRQ when PCMBSY bit changes, so instead of above, 64 ** the statusflag gets ORed with PCM_BSY (below) (on each read of statusflag of Y8950 and YM2608) 65 */ 66 UINT8 PCM_BSY; /* 1 when ADPCM is playing; Y8950/YM2608 only */ 67 68 UINT8 reg[16]; /* adpcm registers */ 69 UINT8 emulation_mode; /* which chip we're emulating */ 70 }YM_DELTAT; 71 72 /*void YM_DELTAT_BRDY_callback(YM_DELTAT *DELTAT);*/ 73 74 UINT8 YM_DELTAT_ADPCM_Read(YM_DELTAT *DELTAT); 75 void YM_DELTAT_ADPCM_Write(YM_DELTAT *DELTAT,int r,int v); 76 void YM_DELTAT_ADPCM_Reset(YM_DELTAT *DELTAT,int pan,int emulation_mode); 77 void YM_DELTAT_ADPCM_CALC(YM_DELTAT *DELTAT); 78 79 void YM_DELTAT_postload(YM_DELTAT *DELTAT,UINT8 *regs); 80 void YM_DELTAT_savestate(const char *statename,int num,YM_DELTAT *DELTAT); 81 82 #endif 83