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[AICA] Fixed ADPCM looping.

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This commit is contained in:
R. Belmont 2008-02-20 05:08:58 +00:00
parent a1d920d679
commit 4ba34771dc
1 changed files with 27 additions and 7 deletions
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34
src/emu/sound/aica.c
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@ -124,7 +124,8 @@ struct _SLOT
int cur_quant; //current ADPCM step
int nxt_quant; //next ADPCM step
int curstep, nxtstep;
UINT8 *adbase, *nxtbase;
int cur_lpquant, cur_lpsample, cur_lpstep;
UINT8 *adbase, *nxtbase, *adlpbase;
};
@ -997,6 +998,7 @@ INLINE INT32 AICA_UpdateSlot(struct _AICA *AICA, struct _SLOT *slot)
UINT32 addr1,addr2,addr_select; // current and next sample addresses
UINT32 *addr[2] = {&addr1, &addr2}; // used for linear interpolation
UINT32 *slot_addr[2] = {&(slot->cur_addr), &(slot->nxt_addr)}; //
int *adpcm_sample[2] = {&(slot->cur_sample), &(slot->nxt_sample)};
if(SSCTL(slot)!=0) //no FM or noise yet
return 0;
@ -1044,6 +1046,8 @@ INLINE INT32 AICA_UpdateSlot(struct _AICA *AICA, struct _SLOT *slot)
else // 4-bit ADPCM
{
UINT8 *base= slot->adbase;
UINT8 *p1=(unsigned char *) (AICA->AICARAM+((SA(slot)+(addr1>>1))&AICA->RAM_MASK));
UINT8 *p2=(unsigned char *) (AICA->AICARAM+((SA(slot)+(addr2>>1))&AICA->RAM_MASK));
INT32 s;
INT32 fpart=slot->cur_addr&((1<<SHIFT)-1);
UINT32 steps_to_go = addr1, curstep = slot->curstep;
@ -1111,7 +1115,7 @@ INLINE INT32 AICA_UpdateSlot(struct _AICA *AICA, struct _SLOT *slot)
slot->EG.state = DECAY1;
}
for (addr_select=0;addr_select<2;addr_select++)
for (addr_select=0; addr_select<2; addr_select++)
{
INT32 rem_addr;
switch(LPCTL(slot))
@ -1128,13 +1132,29 @@ INLINE INT32 AICA_UpdateSlot(struct _AICA *AICA, struct _SLOT *slot)
{
rem_addr = *slot_addr[addr_select] - (LEA(slot)<<SHIFT);
*slot_addr[addr_select]=(LSA(slot)<<SHIFT) + rem_addr;
if(PCMS(slot)==2 && addr_select==0)
if(PCMS(slot)>=2 && addr_select==0)
{
InitADPCM(&(slot->cur_sample), &(slot->cur_quant));
// restore the state @ LSA - the sampler will naturally walk to (LSA + remainder)
slot->adbase = &AICA->AICARAM[SA(slot)+(LSA(slot)/2)];
slot->curstep = LSA(slot);
if (PCMS(slot) == 2)
{
slot->cur_sample = slot->cur_lpsample;
slot->cur_quant = slot->cur_lpquant;
}
// printf("Looping: slot_addr %x LSA %x LEA %x step %x base %x\n", *slot_addr[addr_select]>>SHIFT, LSA(slot), LEA(slot), slot->curstep, slot->adbase);
}
else if(PCMS(slot)==2 && addr_select==1)
else if(PCMS(slot)>=2 && addr_select==1)
{
InitADPCM(&(slot->nxt_sample), &(slot->nxt_quant));
slot->nxtbase = &AICA->AICARAM[SA(slot)+(LSA(slot)/2)];
slot->nxtstep = LSA(slot);
if (PCMS(slot) == 2)
{
slot->nxt_sample = slot->cur_lpsample;
slot->nxt_quant = slot->cur_lpquant;
}
}
}
break;
@ -1332,7 +1352,7 @@ void aica_get_info(void *token, UINT32 state, sndinfo *info)
/* --- the following bits of info are returned as NULL-terminated strings --- */
case SNDINFO_STR_NAME: info->s = "AICA"; break;
case SNDINFO_STR_CORE_FAMILY: info->s = "Sega/Yamaha custom"; break;
case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; break;
case SNDINFO_STR_CORE_VERSION: info->s = "1.0.1"; break;
case SNDINFO_STR_CORE_FILE: info->s = __FILE__; break;
case SNDINFO_STR_CORE_CREDITS: info->s = "Copyright Nicola Salmoria and the MAME Team"; break;
}