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/*
* Sega System 32 Multi/Model 1 custom PCM chip (315-5560) emulation.
*
* by R. Belmont. Info from AMUSE, Hoot, and the YMF278B (OPL4).
* This chip is sort of a dry run for the PCM section of the YMF278B,
* and it has many obvious similarities to that chip.
*
* voice registers:
* 0: pan
* 1: sample to play (PCM chip uses table to figure out)
* 2: LSB of pitch
* 3: MSB of pitch
* 4: voice control: top bit = 1 for key on, 0 for key off
* 5: bit 0: loop, bits 1-7 = volume attenuate (0=max, 7f=min)
* 6: LFO (OutRunners engine, singing man in Daytona)
* 7: LFO
*
* The first sample ROM contains a variable length table with 12
* bytes per instrument/sample. The end of the table is marked
* by 12 bytes of 0xFF. This is very similar to the YMF278B.
*
* The first 3 bytes are the offset into the file (big endian).
* The next 2 are the loop start offset into the file (big endian)
* The next 2 are the 2's complement of the total sample size (big endian)
* The next byte is unknown.
* The next 3 are envelope attack / decay / release parameters (not yet emulated)
*
*/
#include <math.h>
#include "sndintrf.h"
#include "streams.h"
#include "multipcm.h"
#define MULTIPCM_CLOCKDIV (360.0)
#define MULTIPCM_ONE (18)
static const int ctbl[] =
{
0, 1, 2, 3, 4, 5, 6 , -1, // voice number mapping
7, 8, 9, 10,11,12,13, -1,
14,15,16,17,18,19,20, -1,
21,22,23,24,25,26,27, -1,
};
static const int decaytbl[16] = // decay times
{
0, 300, 800, 1400,
2100, 3000, 4000, 5200,
6600, 8200, 10000, 12000,
14500, 17500, 21000, 25000
};
// sample info struct
typedef struct PCM_t
{
INT32 st;
INT32 size;
INT32 loop;
UINT8 env[4];
} PCMInfoT;
// voice structure
typedef struct Voice_t
{
INT8 active; // active flag
INT8 loop; // loop flag
INT32 end; // length of sample
INT32 loopst; // loop start offset
INT32 pan; // panning
INT32 vol; // volume
INT8 *pSamp; // pointer to start of sample data
INT32 ptdelta; // pitch step
INT32 ptoffset; // fixed point offset
INT32 ptsum; // fixed point sum
INT32 relamt; // release amount
INT32 relcount; // release counter
INT8 relstage; // release stage
} VoiceT;
// chip structure
typedef struct MultiPCM_t
{
sound_stream * stream;
UINT8 registers[28][8]; // 8 registers per voice?
UINT32 bankL, bankR;
VoiceT Voices[28];
int curreg, curvoice;
INT8 *romptr;
long dlttbl[0x1001]; // pre-calculated pitch table
long voltbl[128]; // pre-calculated volume table
long pantbl[16]; // pre-calculated panning table
PCMInfoT samples[512];
} MultiPCMT;
static void MultiPCM_postload(void *param)
{
MultiPCMT *mpcm = param;
int j;
for (j = 0; j < 28; j++)
{
int inum = mpcm->registers[j][1] | ((mpcm->registers[j][2]&0x1)<<8);
mpcm->Voices[j].pSamp = &mpcm->romptr[mpcm->samples[inum].st];
}
}
static void MultiPCM_update(void *param, stream_sample_t **inputs, stream_sample_t **buffer, int length )
{
MultiPCMT *mpcm = param;
stream_sample_t *datap[2];
int i, j;
signed long lvol, rvol, mlvol, mrvol;
INT8 *pSamp;
long cnt, ptsum, ptoffset, ptdelta, end;
VoiceT *vptr;
float decTemp;
char relstage;
int relcount, relamt;
float invrelamt;
datap[0] = buffer[0];
datap[1] = buffer[1];
memset(datap[0], 0, sizeof(*datap[0])*length);
memset(datap[1], 0, sizeof(*datap[1])*length);
for (j = 0; j < 28; j++)
{
vptr = &mpcm->Voices[j];
// is voice playing?
if ((vptr->active) || (vptr->relstage))
{ // only calculate volume once per voice per update cycle
rvol = mpcm->pantbl[vptr->pan];
lvol = mpcm->pantbl[15-vptr->pan];
mrvol = rvol = (rvol * vptr->vol)>>8;
mlvol = lvol = (lvol * vptr->vol)>>8;
decTemp = 1.0f;
// copy our "working set" into locals
ptsum = vptr->ptsum;
ptoffset = vptr->ptoffset;
ptdelta = vptr->ptdelta;
end = vptr->end;
pSamp = vptr->pSamp;
relstage = vptr->relstage;
relcount = vptr->relcount;
relamt = vptr->relamt;
invrelamt = 1.f / (float)relamt;
for (i = 0; i < length; i++)
{
cnt = ptsum >> MULTIPCM_ONE;
ptsum &= ((1<<MULTIPCM_ONE)-1);
ptoffset += cnt;
if (ptoffset >= end)
{
if (vptr->loop)
{
ptoffset = vptr->loopst;
}
else
{
vptr->active = 0;
break;
}
}
if (relstage)
{
relcount++;
if (relcount > relamt)
{
relstage = 0;
vptr->relstage = 0;
break;
}
decTemp = 1.0f - (relcount * invrelamt);
lvol = mlvol * decTemp;
rvol = mrvol * decTemp;
}
ptsum += ptdelta;
datap[0][i] += ((pSamp[ptoffset] * lvol)>>2);
datap[1][i] += ((pSamp[ptoffset] * rvol)>>2);
}
// copy back the working values we need to keep
vptr->ptsum = ptsum;
vptr->ptoffset = ptoffset;
vptr->relcount = relcount;
}
}
}
static void *multipcm_start(int sndindex, int clock, const void *config)
{
int i;
double unity = (double)(1<<MULTIPCM_ONE);
UINT8* phdr;
long nowadrs;
long idx;
const struct MultiPCM_interface *intf = config;
MultiPCMT *mpcm;
// make volume table
double max=255.0;
double db=(48.0/128);
mpcm = auto_malloc(sizeof(*mpcm));
memset(mpcm, 0, sizeof(*mpcm));
for (i = 0; i < 128; i++)
{
mpcm->voltbl[i]=max;
max /= pow(10.0,db/20.0);
}
mpcm->voltbl[127]=0;
// make pan table
for(i=0; i<16; i++)
{
mpcm->pantbl[i]=(long)( (255/sqrt(15)) * sqrt(i));
}
mpcm->curreg = mpcm->curvoice = 0;
mpcm->romptr = (INT8 *)memory_region(intf->region);
for (i = 0; i < 28; i++)
{
mpcm->Voices[i].active = 0;
mpcm->Voices[i].ptsum = 0;
mpcm->Voices[i].ptoffset = 0;
mpcm->Voices[i].loop = 0;
mpcm->Voices[i].loopst = 0;
mpcm->Voices[i].end = 0;
mpcm->Voices[i].pan = 0;
mpcm->Voices[i].vol = 0;
mpcm->Voices[i].relamt = 0;
mpcm->Voices[i].relcount = 0;
mpcm->Voices[i].relstage = 0;
}
mpcm->stream = stream_create(0, 2, clock / MULTIPCM_CLOCKDIV, mpcm, MultiPCM_update);
// make pitch delta table (1 octave)
for(i=0; i<0x1001; i++)
{
mpcm->dlttbl[i] = (long)(unity * (1.0 + ((double)i / 4096.0)));
}
// precalculate the PCM data for a small speedup
phdr = (UINT8 *)mpcm->romptr;
for(i = 0; i < 511; i++)
{
idx = i*12;
nowadrs = (phdr[idx + 0]<<16) + (phdr[idx + 1]<<8) + (phdr[idx + 2]);
if((nowadrs == 0)||(nowadrs==0xffffff))
{ // invalid entry
mpcm->samples[i].st=0;
mpcm->samples[i].size=0;
}
else
{
mpcm->samples[i].st = nowadrs;
mpcm->samples[i].loop = (phdr[idx + 3]<<8) + (phdr[idx + 4]);
mpcm->samples[i].size = 0xffff - ((phdr[idx + 5]<<8) + (phdr[idx + 6]));
mpcm->samples[i].env[0] = phdr[idx + 8];
mpcm->samples[i].env[1] = phdr[idx + 9];
mpcm->samples[i].env[2] = phdr[idx + 10];
}
}
/* set up the save state info */
{
int v;
char mname[20];
sprintf(mname, "MultiPCM %d", sndindex);
state_save_register_item(mname, sndindex, mpcm->bankL);
state_save_register_item(mname, sndindex, mpcm->bankR);
state_save_register_item_2d_array(mname, sndindex, mpcm->registers);
for (v = 0; v < 28; v++)
{
char mname2[32];
sprintf(mname2, "MultiPCM %d v %d", sndindex, v);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].active);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].loop);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].end);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].loopst);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].pan);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].vol);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].ptdelta);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].ptoffset);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].ptsum);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].relamt);
state_save_register_item(mname2, sndindex, mpcm->Voices[v].relstage);
}
state_save_register_item(mname, sndindex, mpcm->curreg);
state_save_register_item(mname, sndindex, mpcm->curvoice);
}
state_save_register_func_postload_ptr(MultiPCM_postload, mpcm);
return mpcm;
}
/* write register */
static void MultiPCM_reg_w(int chip, int offset, UINT8 data)
{
int ppp, inum;
signed short pitch;
long pt_abs, pt_oct, st;
int vnum;
MultiPCMT *cptr = sndti_token(SOUND_MULTIPCM, chip);
VoiceT *vptr;
stream_update(cptr->stream);
switch (offset)
{
case 0: // data / status
if ((cptr->curvoice > 27) || (cptr->curvoice < 0))
{
//logerror("MPCM: unknown write to voice > 28\n");
return;
}
vnum = cptr->curvoice;
cptr->registers[vnum][cptr->curreg] = data;
vptr = &cptr->Voices[vnum];
switch (cptr->curreg)
{
case 0: // panning
ppp = (cptr->registers[vnum][0]>>4)&0xf;
if (ppp >= 8)
{
ppp = -(16-ppp);
}
vptr->pan = ppp + 8;
break;
case 1: // sample
break;
case 2: // pitch LSB
// MUST fall through to update pitch also!
case 3: // pitch MSB
// compute frequency divisor
pitch = (cptr->registers[vnum][3]<<8) + cptr->registers[vnum][2];
pt_abs = (double)abs(pitch);
pt_oct = pt_abs>>12;
if(pitch < 0)
{
vptr->ptdelta = cptr->dlttbl[0x1000 - (pt_abs&0xfff)];
vptr->ptdelta >>= (pt_oct+1);
}
else
{
vptr->ptdelta = cptr->dlttbl[pt_abs&0xfff];
vptr->ptdelta <<= pt_oct;
}
break;
case 4: // key on/off
if (data & 0x80)
{
inum = cptr->registers[vnum][1];
// calc decay amount
vptr->relamt = decaytbl[(0x0f - cptr->samples[inum].env[2])];
// compute start and end pointers
st = cptr->samples[inum].st;
// perform banking
if (st >= 0x100000)
{
/* logerror("MPCM: key on chip %d voice %d\n", chip, vnum);
logerror("regs %02x %02x %02x %02x %02x %02x %02x %02x\n", cptr->registers[vnum][0],
cptr->registers[vnum][1],cptr->registers[vnum][2],cptr->registers[vnum][3],
cptr->registers[vnum][4],cptr->registers[vnum][5],
cptr->registers[vnum][6],cptr->registers[vnum][7]);*/
if (vptr->pan < 8)
{
st = (st & 0xfffff) + cptr->bankL;
}
else
{
st = (st & 0xfffff) + cptr->bankR;
}
}
vptr->pSamp = &cptr->romptr[st];
vptr->end = cptr->samples[inum].size;
vptr->loopst = cptr->samples[inum].loop;
vptr->ptoffset = 0;
vptr->ptsum = 0;
vptr->active = 1;
vptr->relstage = 0;
}
else
{
// logerror("MPCM: key off chip %d voice %d\n", chip, vnum);
vptr->active = 0;
vptr->relcount = 0;
if ((vptr->loop) && (vptr->pSamp))
{
vptr->relstage = 1;
}
}
break;
case 5: // volume/loop
vptr->vol = cptr->voltbl[(cptr->registers[vnum][5]>>1)&0x7f];
vptr->loop = (cptr->registers[vnum][5]&0x1) || !vptr->loopst;
break;
case 6: // ??? LFO? reverb?
case 7:
// logerror("write %x to reg %d, voice %d\n", data, cptr->curreg, vnum);
break;
default:
// logerror("write %x to reg %d, voice %d\n", data, cptr->curreg, vnum);
break;
}
break;
case 1: // voice select
cptr->curvoice = ctbl[data&0x1f];
break;
case 2: // register select
cptr->curreg = data;
if (cptr->curreg > 7)
cptr->curreg = 7;
break;
}
}
/* read register */
static UINT8 MultiPCM_reg_r(int chip, int offset)
{
UINT8 retval = 0;
switch (offset)
{
case 0:
retval = 0; // always return READY
break;
default:
//logerror("read from unknown MPCM register %ld\n", offset);
break;
}
return retval;
}
/* MAME/M1 access functions */
READ8_HANDLER( MultiPCM_reg_0_r )
{
return MultiPCM_reg_r(0, offset);
}
WRITE8_HANDLER( MultiPCM_reg_0_w )
{
MultiPCM_reg_w(0, offset, data);
}
READ8_HANDLER( MultiPCM_reg_1_r )
{
return MultiPCM_reg_r(1, offset);
}
WRITE8_HANDLER( MultiPCM_reg_1_w )
{
MultiPCM_reg_w(1, offset, data);
}
void multipcm_set_bank(int which, UINT32 leftoffs, UINT32 rightoffs)
{
struct MultiPCM_t *mpcm = sndti_token(SOUND_MULTIPCM, which);
mpcm->bankL = leftoffs;
mpcm->bankR = rightoffs;
}
/**************************************************************************
* Generic get_info
**************************************************************************/
static void multipcm_set_info(void *token, UINT32 state, sndinfo *info)
{
switch (state)
{
/* no parameters to set */
}
}
void multipcm_get_info(void *token, UINT32 state, sndinfo *info)
{
switch (state)
{
/* --- the following bits of info are returned as 64-bit signed integers --- */
/* --- the following bits of info are returned as pointers to data or functions --- */
case SNDINFO_PTR_SET_INFO: info->set_info = multipcm_set_info; break;
case SNDINFO_PTR_START: info->start = multipcm_start; break;
case SNDINFO_PTR_STOP: /* Nothing */ break;
case SNDINFO_PTR_RESET: /* Nothing */ break;
/* --- the following bits of info are returned as NULL-terminated strings --- */
case SNDINFO_STR_NAME: info->s = "MultiPCM"; break;
case SNDINFO_STR_CORE_FAMILY: info->s = "Sega custom"; break;
case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; 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;
}
}
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