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-rw-r--r--src/emu/sound/ymdeltat.h82
1 files changed, 82 insertions, 0 deletions
diff --git a/src/emu/sound/ymdeltat.h b/src/emu/sound/ymdeltat.h
new file mode 100644
index 00000000000..15c626e3e13
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+++ b/src/emu/sound/ymdeltat.h
@@ -0,0 +1,82 @@
+#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 */
+typedef struct deltat_adpcm_state { /* 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 */
+}YM_DELTAT;
+
+/*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(const char *statename,int num,YM_DELTAT *DELTAT);
+
+#endif