SDLPAL/adplug/fmopl.c

/*
**
** File: fmopl.c -- software implementation of FM sound generator
**
** Copyright (C) 1999,2000 Tatsuyuki Satoh , MultiArcadeMachineEmurator development
**
** Version 0.37a
**
*/

/* This version of fmopl.c is a fork of the MAME one, relicensed under the LGPL.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef __clang__
#define INLINE          static
#else
#define INLINE          __inline
#endif
#define HAS_YM3812      1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>
#include "fmopl.h"

#ifndef PI
#define PI 3.14159265358979323846
#endif

/* -------------------- for debug --------------------- */
/* #define OPL_OUTPUT_LOG */
#ifdef OPL_OUTPUT_LOG
static FILE *opl_dbg_fp = NULL;
static FM_OPL *opl_dbg_opl[16];
static int opl_dbg_maxchip,opl_dbg_chip;
#endif

/* -------------------- preliminary define section --------------------- */
/* attack/decay rate time rate */
#define OPL_ARRATE     141280  /* RATE 4 =  2826.24ms @ 3.6MHz */
#define OPL_DRRATE    1956000  /* RATE 4 = 39280.64ms @ 3.6MHz */

#define DELTAT_MIXING_LEVEL (1) /* DELTA-T ADPCM MIXING LEVEL */

#define FREQ_BITS 24                    /* frequency turn          */

/* counter bits = 20 , octerve 7 */
#define FREQ_RATE   (1<<(FREQ_BITS-20))
#define TL_BITS    (FREQ_BITS+2)

/* final output shift , limit minimum and maximum */
#define OPL_OUTSB   (TL_BITS+3-16)              /* OPL output final shift 16bit */
#define OPL_MAXOUT (0x7fff<<OPL_OUTSB)
#define OPL_MINOUT (-0x8000<<OPL_OUTSB)

/* -------------------- quality selection --------------------- */

/* sinwave entries */
/* used static memory = SIN_ENT * 4 (byte) */
#define SIN_ENT 2048

/* output level entries (envelope,sinwave) */
/* envelope counter lower bits */
#define ENV_BITS 16
/* envelope output entries */
#define EG_ENT   4096
/* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */
/* used static  memory = EG_ENT*4 (byte)                     */

#define EG_OFF   ((2*EG_ENT)<<ENV_BITS)  /* OFF          */
#define EG_DED   EG_OFF
#define EG_DST   (EG_ENT<<ENV_BITS)      /* DECAY  START */
#define EG_AED   EG_DST
#define EG_AST   0                       /* ATTACK START */

#define EG_STEP (96.0/EG_ENT) /* OPL is 0.1875 dB step  */

/* LFO table entries */
#define VIB_ENT 512
#define VIB_SHIFT (32-9)
#define AMS_ENT 512
#define AMS_SHIFT (32-9)

#define VIB_RATE 256

/* -------------------- local defines , macros --------------------- */

/* register number to channel number , slot offset */
#define SLOT1 0
#define SLOT2 1

/* envelope phase */
#define ENV_MOD_RR  0x00
#define ENV_MOD_DR  0x01
#define ENV_MOD_AR  0x02

/* -------------------- tables --------------------- */
static const int slot_array[32] = {
   0, 2, 4, 1, 3, 5,-1,-1,
   6, 8,10, 7, 9,11,-1,-1,
   12,14,16,13,15,17,-1,-1,
   -1,-1,-1,-1,-1,-1,-1,-1
};

/* key scale level */
/* table is 3dB/OCT , DV converts this in TL step at 6dB/OCT */
#define DV (EG_STEP/2)
static const UINT32 KSL_TABLE[8*16]= {
   /* OCT 0 */
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   /* OCT 1 */
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 0.750/DV, 1.125/DV, 1.500/DV,
   1.875/DV, 2.250/DV, 2.625/DV, 3.000/DV,
   /* OCT 2 */
   0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
   0.000/DV, 1.125/DV, 1.875/DV, 2.625/DV,
   3.000/DV, 3.750/DV, 4.125/DV, 4.500/DV,
   4.875/DV, 5.250/DV, 5.625/DV, 6.000/DV,
   /* OCT 3 */
   0.000/DV, 0.000/DV, 0.000/DV, 1.875/DV,
   3.000/DV, 4.125/DV, 4.875/DV, 5.625/DV,
   6.000/DV, 6.750/DV, 7.125/DV, 7.500/DV,
   7.875/DV, 8.250/DV, 8.625/DV, 9.000/DV,
   /* OCT 4 */
   0.000/DV, 0.000/DV, 3.000/DV, 4.875/DV,
   6.000/DV, 7.125/DV, 7.875/DV, 8.625/DV,
   9.000/DV, 9.750/DV,10.125/DV,10.500/DV,
   10.875/DV,11.250/DV,11.625/DV,12.000/DV,
   /* OCT 5 */
   0.000/DV, 3.000/DV, 6.000/DV, 7.875/DV,
   9.000/DV,10.125/DV,10.875/DV,11.625/DV,
   12.000/DV,12.750/DV,13.125/DV,13.500/DV,
   13.875/DV,14.250/DV,14.625/DV,15.000/DV,
   /* OCT 6 */
   0.000/DV, 6.000/DV, 9.000/DV,10.875/DV,
   12.000/DV,13.125/DV,13.875/DV,14.625/DV,
   15.000/DV,15.750/DV,16.125/DV,16.500/DV,
   16.875/DV,17.250/DV,17.625/DV,18.000/DV,
   /* OCT 7 */
   0.000/DV, 9.000/DV,12.000/DV,13.875/DV,
   15.000/DV,16.125/DV,16.875/DV,17.625/DV,
   18.000/DV,18.750/DV,19.125/DV,19.500/DV,
   19.875/DV,20.250/DV,20.625/DV,21.000/DV
};
#undef DV

/* sustain lebel table (3db per step) */
/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
#define SC(db) (db*((3/EG_STEP)*(1<<ENV_BITS)))+EG_DST
static const INT32 SL_TABLE[16]={
   SC( 0),SC( 1),SC( 2),SC(3 ),SC(4 ),SC(5 ),SC(6 ),SC( 7),
   SC( 8),SC( 9),SC(10),SC(11),SC(12),SC(13),SC(14),SC(31)
};
#undef SC

#define TL_MAX (EG_ENT*2) /* limit(tl + ksr + envelope) + sinwave */
/* TotalLevel : 48 24 12  6  3 1.5 0.75 (dB) */
/* TL_TABLE[ 0      to TL_MAX          ] : plus  section */
/* TL_TABLE[ TL_MAX to TL_MAX+TL_MAX-1 ] : minus section */
static INT32 *TL_TABLE;

/* pointers to TL_TABLE with sinwave output offset */
static INT32 **SIN_TABLE;

/* LFO table */
static INT32 *AMS_TABLE;
static INT32 *VIB_TABLE;

/* envelope output curve table */
/* attack + decay + OFF */
static INT32 ENV_CURVE[2*EG_ENT+1];

/* multiple table */
#define ML 2
static const UINT32 MUL_TABLE[16]= {
   /* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
   0.50*ML, 1.00*ML, 2.00*ML, 3.00*ML, 4.00*ML, 5.00*ML, 6.00*ML, 7.00*ML,
   8.00*ML, 9.00*ML,10.00*ML,10.00*ML,12.00*ML,12.00*ML,15.00*ML,15.00*ML
};
#undef ML

/* dummy attack / decay rate ( when rate == 0 ) */
static INT32 RATE_0[16]= {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

/* -------------------- static state --------------------- */

/* lock level of common table */
static int num_lock = 0;

/* work table */
static void *cur_chip = NULL;   /* current chip point */
/* currenct chip state */
/* static OPLSAMPLE  *bufL,*bufR; */
static OPL_CH *S_CH;
static OPL_CH *E_CH;
OPL_SLOT *SLOT7_1,*SLOT7_2,*SLOT8_1,*SLOT8_2;

static INT32 outd[1];
static INT32 ams;
static INT32 vib;
INT32  *ams_table;
INT32  *vib_table;
static INT32 amsIncr;
static INT32 vibIncr;
static INT32 feedback2;         /* connect for SLOT 2 */

/* log output level */
#define LOG_ERR  3      /* ERROR       */
#define LOG_WAR  2      /* WARNING     */
#define LOG_INF  1      /* INFORMATION */

//#define LOG_LEVEL LOG_INF
#define LOG_LEVEL       LOG_ERR

//#define LOG(n,x) if( (n)>=LOG_LEVEL ) logerror x
#define LOG(n,x)

/* --------------------- subroutines  --------------------- */

INLINE int Limit( int val, int max, int min ) {
   if ( val > max )
      val = max;
   else if ( val < min )
      val = min;

   return val;
}

/* status set and IRQ handling */
INLINE void OPL_STATUS_SET(FM_OPL *OPL,int flag) {
   /* set status flag */
   OPL->status |= flag;
   if (!(OPL->status & 0x80)) {
      if (OPL->status & OPL->statusmask) {      /* IRQ on */
         OPL->status |= 0x80;
         /* callback user interrupt handler (IRQ is OFF to ON) */
         if (OPL->IRQHandler) (OPL->IRQHandler)(OPL->IRQParam,1);
      }
   }
}

/* status reset and IRQ handling */
INLINE void OPL_STATUS_RESET(FM_OPL *OPL,int flag) {
   /* reset status flag */
   OPL->status &=~flag;
   if ((OPL->status & 0x80)) {
      if (!(OPL->status & OPL->statusmask) ) {
         OPL->status &= 0x7f;
         /* callback user interrupt handler (IRQ is ON to OFF) */
         if (OPL->IRQHandler) (OPL->IRQHandler)(OPL->IRQParam,0);
      }
   }
}

/* IRQ mask set */
INLINE void OPL_STATUSMASK_SET(FM_OPL *OPL,int flag) {
   OPL->statusmask = flag;
   /* IRQ handling check */
   OPL_STATUS_SET(OPL,0);
   OPL_STATUS_RESET(OPL,0);
}

/* ----- key on  ----- */
INLINE void OPL_KEYON(OPL_SLOT *SLOT) {
   /* sin wave restart */
   SLOT->Cnt = 0;
   /* set attack */
   SLOT->evm = ENV_MOD_AR;
   SLOT->evs = SLOT->evsa;
   SLOT->evc = EG_AST;
   SLOT->eve = EG_AED;
}
/* ----- key off ----- */
INLINE void OPL_KEYOFF(OPL_SLOT *SLOT) {
   if ( SLOT->evm > ENV_MOD_RR) {
      /* set envelope counter from envleope output */
      SLOT->evm = ENV_MOD_RR;
      if ( !(SLOT->evc&EG_DST) )
         //SLOT->evc = (ENV_CURVE[SLOT->evc>>ENV_BITS]<<ENV_BITS) + EG_DST;
         SLOT->evc = EG_DST;
      SLOT->eve = EG_DED;
      SLOT->evs = SLOT->evsr;
   }
}

/* ---------- calcrate Envelope Generator & Phase Generator ---------- */
/* return : envelope output */
INLINE UINT32 OPL_CALC_SLOT( OPL_SLOT *SLOT ) {
   /* calcrate envelope generator */
   if ( (SLOT->evc+=SLOT->evs) >= SLOT->eve ) {
      switch ( SLOT->evm ) {
      case ENV_MOD_AR: /* ATTACK -> DECAY1 */
         /* next DR */
         SLOT->evm = ENV_MOD_DR;
         SLOT->evc = EG_DST;
         SLOT->eve = SLOT->SL;
         SLOT->evs = SLOT->evsd;
         break;
      case ENV_MOD_DR: /* DECAY -> SL or RR */
         SLOT->evc = SLOT->SL;
         SLOT->eve = EG_DED;
         if (SLOT->eg_typ) {
            SLOT->evs = 0;
         } else {
            SLOT->evm = ENV_MOD_RR;
            SLOT->evs = SLOT->evsr;
         }
         break;
      case ENV_MOD_RR: /* RR -> OFF */
         SLOT->evc = EG_OFF;
         SLOT->eve = EG_OFF+1;
         SLOT->evs = 0;
         break;
      }
   }
   /* calcrate envelope */
   return SLOT->TLL+ENV_CURVE[SLOT->evc>>ENV_BITS]+(SLOT->ams ? ams : 0);
}

/* set algorythm connection */
static void set_algorythm( OPL_CH *CH) {
   INT32 *carrier = &outd[0];
   CH->connect1 = CH->CON ? carrier : &feedback2;
   CH->connect2 = carrier;
}

/* ---------- frequency counter for operater update ---------- */
INLINE void CALC_FCSLOT(OPL_CH *CH,OPL_SLOT *SLOT) {
   int ksr;

   /* frequency step counter */
   SLOT->Incr = CH->fc * SLOT->mul;
   ksr = CH->kcode >> SLOT->KSR;

   if ( SLOT->ksr != ksr ) {
      SLOT->ksr = ksr;
      /* attack , decay rate recalcration */
      SLOT->evsa = SLOT->AR[ksr];
      SLOT->evsd = SLOT->DR[ksr];
      SLOT->evsr = SLOT->RR[ksr];
   }
   SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}

/* set multi,am,vib,EG-TYP,KSR,mul */
INLINE void set_mul(FM_OPL *OPL,int slot,int v) {
   OPL_CH   *CH   = &OPL->P_CH[slot/2];
   OPL_SLOT *SLOT = &CH->SLOT[slot&1];

   SLOT->mul    = MUL_TABLE[v&0x0f];
   SLOT->KSR    = (v&0x10) ? 0 : 2;
   SLOT->eg_typ = (v&0x20)>>5;
   SLOT->vib    = (v&0x40);
   SLOT->ams    = (v&0x80);
   CALC_FCSLOT(CH,SLOT);
}

/* set ksl & tl */
INLINE void set_ksl_tl(FM_OPL *OPL,int slot,int v) {
   OPL_CH   *CH   = &OPL->P_CH[slot/2];
   OPL_SLOT *SLOT = &CH->SLOT[slot&1];
   int ksl = v>>6; /* 0 / 1.5 / 3 / 6 db/OCT */

   SLOT->ksl = ksl ? 3-ksl : 31;
   SLOT->TL  = (v&0x3f)*(0.75/EG_STEP); /* 0.75db step */

   if ( !(OPL->mode&0x80) ) {   /* not CSM latch total level */
      SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
   }
}

/* set attack rate & decay rate  */
INLINE void set_ar_dr(FM_OPL *OPL,int slot,int v) {
   OPL_CH   *CH   = &OPL->P_CH[slot/2];
   OPL_SLOT *SLOT = &CH->SLOT[slot&1];
   int ar = v>>4;
   int dr = v&0x0f;

   SLOT->AR = ar ? &OPL->AR_TABLE[ar<<2] : RATE_0;
   SLOT->evsa = SLOT->AR[SLOT->ksr];
   if ( SLOT->evm == ENV_MOD_AR ) SLOT->evs = SLOT->evsa;

   SLOT->DR = dr ? &OPL->DR_TABLE[dr<<2] : RATE_0;
   SLOT->evsd = SLOT->DR[SLOT->ksr];
   if ( SLOT->evm == ENV_MOD_DR ) SLOT->evs = SLOT->evsd;
}

/* set sustain level & release rate */
INLINE void set_sl_rr(FM_OPL *OPL,int slot,int v) {
   OPL_CH   *CH   = &OPL->P_CH[slot/2];
   OPL_SLOT *SLOT = &CH->SLOT[slot&1];
   int sl = v>>4;
   int rr = v & 0x0f;

   SLOT->SL = SL_TABLE[sl];
   if ( SLOT->evm == ENV_MOD_DR ) SLOT->eve = SLOT->SL;
   SLOT->RR = &OPL->DR_TABLE[rr<<2];
   SLOT->evsr = SLOT->RR[SLOT->ksr];
   if ( SLOT->evm == ENV_MOD_RR ) SLOT->evs = SLOT->evsr;
}

/* operator output calcrator */
#define OP_OUT(slot,env,con)   slot->wavetable[((slot->Cnt+con)/(0x1000000/SIN_ENT))&(SIN_ENT-1)][env]
/* ---------- calcrate one of channel ---------- */
INLINE void OPL_CALC_CH( OPL_CH *CH ) {
   UINT32 env_out;
   OPL_SLOT *SLOT;

   feedback2 = 0;
   /* SLOT 1 */
   SLOT = &CH->SLOT[SLOT1];
   env_out=OPL_CALC_SLOT(SLOT);
   if ( env_out < EG_ENT-1 ) {
      /* PG */
      if (SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
      else          SLOT->Cnt += SLOT->Incr;
      /* connectoion */
      if (CH->FB) {
         int feedback1 = (CH->op1_out[0]+CH->op1_out[1])>>CH->FB;
         CH->op1_out[1] = CH->op1_out[0];
         *CH->connect1 += CH->op1_out[0] = OP_OUT(SLOT,env_out,feedback1);
      } else {
         *CH->connect1 += OP_OUT(SLOT,env_out,0);
      }
   } else {
      CH->op1_out[1] = CH->op1_out[0];
      CH->op1_out[0] = 0;
   }
   /* SLOT 2 */
   SLOT = &CH->SLOT[SLOT2];
   env_out=OPL_CALC_SLOT(SLOT);
   if ( env_out < EG_ENT-1 ) {
      /* PG */
      if (SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
      else          SLOT->Cnt += SLOT->Incr;
      /* connectoion */
      outd[0] += OP_OUT(SLOT,env_out, feedback2);
   }
}

/* ---------- calcrate rythm block ---------- */
#define WHITE_NOISE_db 6.0
INLINE void OPL_CALC_RH( OPL_CH *CH ) {
   UINT32 env_tam,env_sd,env_top,env_hh;
   int whitenoise = (rand()&1)*(WHITE_NOISE_db/EG_STEP);
   INT32 tone8;

   OPL_SLOT *SLOT;
   int env_out;

   /* BD : same as FM serial mode and output level is large */
   feedback2 = 0;
   /* SLOT 1 */
   SLOT = &CH[6].SLOT[SLOT1];
   env_out=OPL_CALC_SLOT(SLOT);
   if ( env_out < EG_ENT-1 ) {
      /* PG */
      if (SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
      else          SLOT->Cnt += SLOT->Incr;
      /* connectoion */
      if (CH[6].FB) {
         int feedback1 = (CH[6].op1_out[0]+CH[6].op1_out[1])>>CH[6].FB;
         CH[6].op1_out[1] = CH[6].op1_out[0];
         feedback2 = CH[6].op1_out[0] = OP_OUT(SLOT,env_out,feedback1);
      } else {
         feedback2 = OP_OUT(SLOT,env_out,0);
      }
   } else {
      feedback2 = 0;
      CH[6].op1_out[1] = CH[6].op1_out[0];
      CH[6].op1_out[0] = 0;
   }
   /* SLOT 2 */
   SLOT = &CH[6].SLOT[SLOT2];
   env_out=OPL_CALC_SLOT(SLOT);
   if ( env_out < EG_ENT-1 ) {
      /* PG */
      if (SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
      else          SLOT->Cnt += SLOT->Incr;
      /* connectoion */
      outd[0] += OP_OUT(SLOT,env_out, feedback2)*2;
   }

   // SD  (17) = mul14[fnum7] + white noise
   // TAM (15) = mul15[fnum8]
   // TOP (18) = fnum6(mul18[fnum8]+whitenoise)
   // HH  (14) = fnum7(mul18[fnum8]+whitenoise) + white noise
   env_sd =OPL_CALC_SLOT(SLOT7_2) + whitenoise;
   env_tam=OPL_CALC_SLOT(SLOT8_1);
   env_top=OPL_CALC_SLOT(SLOT8_2);
   env_hh =OPL_CALC_SLOT(SLOT7_1) + whitenoise;

   /* PG */
   if (SLOT7_1->vib) SLOT7_1->Cnt += (2*SLOT7_1->Incr*vib/VIB_RATE);
   else             SLOT7_1->Cnt += 2*SLOT7_1->Incr;
   if (SLOT7_2->vib) SLOT7_2->Cnt += ((CH[7].fc*8)*vib/VIB_RATE);
   else             SLOT7_2->Cnt += (CH[7].fc*8);
   if (SLOT8_1->vib) SLOT8_1->Cnt += (SLOT8_1->Incr*vib/VIB_RATE);
   else             SLOT8_1->Cnt += SLOT8_1->Incr;
   if (SLOT8_2->vib) SLOT8_2->Cnt += ((CH[8].fc*48)*vib/VIB_RATE);
   else             SLOT8_2->Cnt += (CH[8].fc*48);

   tone8 = OP_OUT(SLOT8_2,whitenoise,0 );

   /* SD */
   if ( env_sd < EG_ENT-1 )
      outd[0] += OP_OUT(SLOT7_1,env_sd, 0)*8;
   /* TAM */
   if ( env_tam < EG_ENT-1 )
      outd[0] += OP_OUT(SLOT8_1,env_tam, 0)*2;
   /* TOP-CY */
   if ( env_top < EG_ENT-1 )
      outd[0] += OP_OUT(SLOT7_2,env_top,tone8)*2;
   /* HH */
   if ( env_hh  < EG_ENT-1 )
      outd[0] += OP_OUT(SLOT7_2,env_hh,tone8)*2;
}

/* ----------- initialize time tabls ----------- */
static void init_timetables( FM_OPL *OPL , int ARRATE , int DRRATE ) {
   int i;
   double rate;

   /* make attack rate & decay rate tables */
   for (i = 0;i < 4;i++) OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0;
   for (i = 4;i <= 60;i++) {
      rate  = OPL->freqbase;                                            /* frequency rate */
      if ( i < 60 ) rate *= 1.0+(i&3)*0.25;             /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */
      rate *= 1<<((i>>2)-1);                                            /* b2-5 : shift bit */
      rate *= (double)(EG_ENT<<ENV_BITS);
      OPL->AR_TABLE[i] = rate / ARRATE;
      OPL->DR_TABLE[i] = rate / DRRATE;
   }
   for (i = 60;i < 76;i++) {
      OPL->AR_TABLE[i] = EG_AED-1;
      OPL->DR_TABLE[i] = OPL->DR_TABLE[60];
   }
#if 0
   for (i = 0;i < 64 ;i++) {    /* make for overflow area */
      LOG(LOG_WAR,("rate %2d , ar %f ms , dr %f ms \n",i,
                   ((double)(EG_ENT<<ENV_BITS) / OPL->AR_TABLE[i]) * (1000.0 / OPL->rate),
                   ((double)(EG_ENT<<ENV_BITS) / OPL->DR_TABLE[i]) * (1000.0 / OPL->rate) ));
   }
#endif
}

/* ---------- generic table initialize ---------- */
static int OPLOpenTable( void ) {
   int s,t;
   double rate;
   int i,j;
   double pom;

   /* allocate dynamic tables */
   if ( (TL_TABLE = (INT32 *)malloc(TL_MAX*2*sizeof(INT32))) == NULL)
      return 0;
   if ( (SIN_TABLE = (INT32 **)malloc(SIN_ENT*4 *sizeof(INT32 *))) == NULL) {
      free(TL_TABLE);
      return 0;
   }
   if ( (AMS_TABLE = (INT32 *)malloc(AMS_ENT*2 *sizeof(INT32))) == NULL) {
      free(TL_TABLE);
      free(SIN_TABLE);
      return 0;
   }
   if ( (VIB_TABLE = (INT32 *)malloc(VIB_ENT*2 *sizeof(INT32))) == NULL) {
      free(TL_TABLE);
      free(SIN_TABLE);
      free(AMS_TABLE);
      return 0;
   }
   /* make total level table */
   for (t = 0;t < EG_ENT-1 ;t++) {
      rate = ((1<<TL_BITS)-1)/pow(10,EG_STEP*t/20);     /* dB -> voltage */
      TL_TABLE[       t] =  (int)rate;
      TL_TABLE[TL_MAX+t] = -TL_TABLE[t];
      /*                LOG(LOG_INF,("TotalLevel(%3d) = %x\n",t,TL_TABLE[t]));*/
   }
   /* fill volume off area */
   for ( t = EG_ENT-1; t < TL_MAX ;t++) {
      TL_TABLE[t] = TL_TABLE[TL_MAX+t] = 0;
   }

   /* make sinwave table (total level offet) */
   /* degree 0 = degree 180                   = off */
   SIN_TABLE[0] = SIN_TABLE[SIN_ENT/2]         = &TL_TABLE[EG_ENT-1];
   for (s = 1;s <= SIN_ENT/4;s++) {
      pom = sin(2*PI*s/SIN_ENT); /* sin     */
      pom = 20*log10(1/pom);       /* decibel */
      j = pom / EG_STEP;         /* TL_TABLE steps */

      /* degree 0   -  90    , degree 180 -  90 : plus section */
      SIN_TABLE[          s] = SIN_TABLE[SIN_ENT/2-s] = &TL_TABLE[j];
      /* degree 180 - 270    , degree 360 - 270 : minus section */
      SIN_TABLE[SIN_ENT/2+s] = SIN_TABLE[SIN_ENT  -s] = &TL_TABLE[TL_MAX+j];
      /*                LOG(LOG_INF,("sin(%3d) = %f:%f db\n",s,pom,(double)j * EG_STEP));*/
   }
   for (s = 0;s < SIN_ENT;s++) {
      SIN_TABLE[SIN_ENT*1+s] = s<(SIN_ENT/2) ? SIN_TABLE[s] : &TL_TABLE[EG_ENT];
      SIN_TABLE[SIN_ENT*2+s] = SIN_TABLE[s % (SIN_ENT/2)];
      SIN_TABLE[SIN_ENT*3+s] = (s/(SIN_ENT/4))&1 ? &TL_TABLE[EG_ENT] : SIN_TABLE[SIN_ENT*2+s];
   }

   /* envelope counter -> envelope output table */
   for (i=0; i<EG_ENT; i++) {
      /* ATTACK curve */
      pom = pow( ((double)(EG_ENT-1-i)/EG_ENT) , 8 ) * EG_ENT;
      /* if( pom >= EG_ENT ) pom = EG_ENT-1; */
      ENV_CURVE[i] = (int)pom;
      /* DECAY ,RELEASE curve */
      ENV_CURVE[(EG_DST>>ENV_BITS)+i]= i;
   }
   /* off */
   ENV_CURVE[EG_OFF>>ENV_BITS]= EG_ENT-1;
   /* make LFO ams table */
   for (i=0; i<AMS_ENT; i++) {
      pom = (1.0+sin(2*PI*i/AMS_ENT))/2; /* sin */
      AMS_TABLE[i]         = (1.0/EG_STEP)*pom; /* 1dB   */
      AMS_TABLE[AMS_ENT+i] = (4.8/EG_STEP)*pom; /* 4.8dB */
   }
   /* make LFO vibrate table */
   for (i=0; i<VIB_ENT; i++) {
      /* 100cent = 1seminote = 6% ?? */
      pom = (double)VIB_RATE*0.06*sin(2*PI*i/VIB_ENT); /* +-100sect step */
      VIB_TABLE[i]         = VIB_RATE + (pom*0.07); /* +- 7cent */
      VIB_TABLE[VIB_ENT+i] = VIB_RATE + (pom*0.14); /* +-14cent */
      /* LOG(LOG_INF,("vib %d=%d\n",i,VIB_TABLE[VIB_ENT+i])); */
   }
   return 1;
}


static void OPLCloseTable( void ) {
   free(TL_TABLE);
   free(SIN_TABLE);
   free(AMS_TABLE);
   free(VIB_TABLE);
}

/* CSM Key Controll */
INLINE void CSMKeyControll(OPL_CH *CH) {
   OPL_SLOT *slot1 = &CH->SLOT[SLOT1];
   OPL_SLOT *slot2 = &CH->SLOT[SLOT2];
   /* all key off */
   OPL_KEYOFF(slot1);
   OPL_KEYOFF(slot2);
   /* total level latch */
   slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
   slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
   /* key on */
   CH->op1_out[0] = CH->op1_out[1] = 0;
   OPL_KEYON(slot1);
   OPL_KEYON(slot2);
}

/* ---------- opl initialize ---------- */
static void OPL_initalize(FM_OPL *OPL) {
   int fn;

   /* frequency base */
   OPL->freqbase = (OPL->rate) ? ((double)OPL->clock / OPL->rate) / 72  : 0;
   /* Timer base time */
   OPL->TimerBase = 1.0/((double)OPL->clock / 72.0 );
   /* make time tables */
   init_timetables( OPL , OPL_ARRATE , OPL_DRRATE );
   /* make fnumber -> increment counter table */
   for ( fn=0 ; fn < 1024 ; fn++ ) {
      OPL->FN_TABLE[fn] = OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2;
   }
   /* LFO freq.table */
   OPL->amsIncr = OPL->rate ? (double)AMS_ENT*(1<<AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0;
   OPL->vibIncr = OPL->rate ? (double)VIB_ENT*(1<<VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0;
}

/* ---------- write a OPL registers ---------- */
static void OPLWriteReg(FM_OPL *OPL, int r, int v) {
   OPL_CH *CH;
   int slot;
   int block_fnum;

   switch (r&0xe0) {
   case 0x00: /* 00-1f:controll */
      switch (r&0x1f) {
      case 0x01:
         /* wave selector enable */
         if (OPL->type&OPL_TYPE_WAVESEL) {
            OPL->wavesel = v&0x20;
            if (!OPL->wavesel) {
               /* preset compatible mode */
               int c;
               for (c=0;c<OPL->max_ch;c++) {
                  OPL->P_CH[c].SLOT[SLOT1].wavetable = &SIN_TABLE[0];
                  OPL->P_CH[c].SLOT[SLOT2].wavetable = &SIN_TABLE[0];
               }
            }
         }
         return;
      case 0x02:        /* Timer 1 */
         OPL->T[0] = (256-v)*4;
         break;
      case 0x03:        /* Timer 2 */
         OPL->T[1] = (256-v)*16;
         return;
      case 0x04:        /* IRQ clear / mask and Timer enable */
         if (v&0x80) {  /* IRQ flag clear */
            OPL_STATUS_RESET(OPL,0x7f);
         } else {       /* set IRQ mask ,timer enable*/
            UINT8 st1 = v&1;
            UINT8 st2 = (v>>1)&1;
            /* IRQRST,T1MSK,t2MSK,EOSMSK,BRMSK,x,ST2,ST1 */
            OPL_STATUS_RESET(OPL,v&0x78);
            OPL_STATUSMASK_SET(OPL,((~v)&0x78)|0x01);
            /* timer 2 */
            if (OPL->st[1] != st2) {
               double interval = st2 ? (double)OPL->T[1]*OPL->TimerBase : 0.0;
               OPL->st[1] = st2;
               if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+1,interval);
            }
            /* timer 1 */
            if (OPL->st[0] != st1) {
               double interval = st1 ? (double)OPL->T[0]*OPL->TimerBase : 0.0;
               OPL->st[0] = st1;
               if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+0,interval);
            }
         }
         return;
#if BUILD_Y8950
      case 0x06:                /* Key Board OUT */
         if (OPL->type&OPL_TYPE_KEYBOARD) {
            if (OPL->keyboardhandler_w)
               OPL->keyboardhandler_w(OPL->keyboard_param,v);
            else
               LOG(LOG_WAR,("OPL:write unmapped KEYBOARD port\n"));
         }
         return;
      case 0x07:        /* DELTA-T controll : START,REC,MEMDATA,REPT,SPOFF,x,x,RST */
         if (OPL->type&OPL_TYPE_ADPCM)
            YM_DELTAT_ADPCM_Write(OPL->deltat,r-0x07,v);
         return;
      case 0x08:        /* MODE,DELTA-T : CSM,NOTESEL,x,x,smpl,da/ad,64k,rom */
         OPL->mode = v;
         v&=0x1f;       /* for DELTA-T unit */
      case 0x09:                /* START ADD */
      case 0x0a:
      case 0x0b:                /* STOP ADD  */
      case 0x0c:
      case 0x0d:                /* PRESCALE   */
      case 0x0e:
      case 0x0f:                /* ADPCM data */
      case 0x10:                /* DELTA-N    */
      case 0x11:                /* DELTA-N    */
      case 0x12:                /* EG-CTRL    */
         if (OPL->type&OPL_TYPE_ADPCM)
            YM_DELTAT_ADPCM_Write(OPL->deltat,r-0x07,v);
         return;
#if 0
      case 0x15:                /* DAC data    */
      case 0x16:
      case 0x17:                /* SHIFT    */
         return;
      case 0x18:                /* I/O CTRL (Direction) */
         if (OPL->type&OPL_TYPE_IO)
            OPL->portDirection = v&0x0f;
         return;
      case 0x19:                /* I/O DATA */
         if (OPL->type&OPL_TYPE_IO) {
            OPL->portLatch = v;
            if (OPL->porthandler_w)
               OPL->porthandler_w(OPL->port_param,v&OPL->portDirection);
         }
         return;
      case 0x1a:                /* PCM data */
         return;
#endif
#endif
      }
      break;
   case 0x20:   /* am,vib,ksr,eg type,mul */
      slot = slot_array[r&0x1f];
      if (slot == -1) return;
      set_mul(OPL,slot,v);
      return;
   case 0x40:
      slot = slot_array[r&0x1f];
      if (slot == -1) return;
      set_ksl_tl(OPL,slot,v);
      return;
   case 0x60:
      slot = slot_array[r&0x1f];
      if (slot == -1) return;
      set_ar_dr(OPL,slot,v);
      return;
   case 0x80:
      slot = slot_array[r&0x1f];
      if (slot == -1) return;
      set_sl_rr(OPL,slot,v);
      return;
   case 0xa0:
      switch (r) {
      case 0xbd:
         /* amsep,vibdep,r,bd,sd,tom,tc,hh */
      {
         UINT8 rkey = OPL->rythm^v;
         OPL->ams_table = &AMS_TABLE[v&0x80 ? AMS_ENT : 0];
         OPL->vib_table = &VIB_TABLE[v&0x40 ? VIB_ENT : 0];
         OPL->rythm  = v&0x3f;
         if (OPL->rythm&0x20) {
#if 0
            usrintf_showmessage("OPL Rythm mode select");
#endif
            /* BD key on/off */
            if (rkey&0x10) {
               if (v&0x10) {
                  OPL->P_CH[6].op1_out[0] = OPL->P_CH[6].op1_out[1] = 0;
                  OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT1]);
                  OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT2]);
               } else {
                  OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT1]);
                  OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT2]);
               }
            }
            /* SD key on/off */
            if (rkey&0x08) {
               if (v&0x08) OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT2]);
               else       OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT2]);
            }/* TAM key on/off */
            if (rkey&0x04) {
               if (v&0x04) OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT1]);
               else       OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT1]);
            }
            /* TOP-CY key on/off */
            if (rkey&0x02) {
               if (v&0x02) OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT2]);
               else       OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT2]);
            }
            /* HH key on/off */
            if (rkey&0x01) {
               if (v&0x01) OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT1]);
               else       OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT1]);
            }
         }
      }
      return;
      }
      /* keyon,block,fnum */
      if ( (r&0x0f) > 8) return;
      CH = &OPL->P_CH[r&0x0f];
      if (!(r&0x10)) {  /* a0-a8 */
         block_fnum  = (CH->block_fnum&0x1f00) | v;
      } else {  /* b0-b8 */
         int keyon = (v>>5)&1;
         block_fnum = ((v&0x1f)<<8) | (CH->block_fnum&0xff);
         if (CH->keyon != keyon) {
            if ( (CH->keyon=keyon) ) {
               CH->op1_out[0] = CH->op1_out[1] = 0;
               OPL_KEYON(&CH->SLOT[SLOT1]);
               OPL_KEYON(&CH->SLOT[SLOT2]);
            } else {
               OPL_KEYOFF(&CH->SLOT[SLOT1]);
               OPL_KEYOFF(&CH->SLOT[SLOT2]);
            }
         }
      }
      /* update */
      if (CH->block_fnum != block_fnum) {
         int blockRv = 7-(block_fnum>>10);
         int fnum   = block_fnum&0x3ff;
         CH->block_fnum = block_fnum;

         CH->ksl_base = KSL_TABLE[block_fnum>>6];
         CH->fc = OPL->FN_TABLE[fnum]>>blockRv;
         CH->kcode = CH->block_fnum>>9;
         if ( (OPL->mode&0x40) && CH->block_fnum&0x100) CH->kcode |=1;
         CALC_FCSLOT(CH,&CH->SLOT[SLOT1]);
         CALC_FCSLOT(CH,&CH->SLOT[SLOT2]);
      }
      return;
   case 0xc0:
      /* FB,C */
      if ( (r&0x0f) > 8) return;
      CH = &OPL->P_CH[r&0x0f];
      {
         int feedback = (v>>1)&7;
         CH->FB   = feedback ? (8+1) - feedback : 0;
         CH->CON = v&1;
         set_algorythm(CH);
      }
      return;
   case 0xe0: /* wave type */
      slot = slot_array[r&0x1f];
      if (slot == -1) return;
      CH = &OPL->P_CH[slot/2];
      if (OPL->wavesel) {
         /* LOG(LOG_INF,("OPL SLOT %d wave select %d\n",slot,v&3)); */
         CH->SLOT[slot&1].wavetable = &SIN_TABLE[(v&0x03)*SIN_ENT];
      }
      return;
   }
}

/* lock/unlock for common table */
static int OPL_LockTable(void) {
   num_lock++;
   if (num_lock>1) return 0;
   /* first time */
   cur_chip = NULL;
   /* allocate total level table (128kb space) */
   if ( !OPLOpenTable() ) {
      num_lock--;
      return -1;
   }
   return 0;
}

static void OPL_UnLockTable(void) {
   if (num_lock) num_lock--;
   if (num_lock) return;
   /* last time */
   cur_chip = NULL;
   OPLCloseTable();
}

#if (BUILD_YM3812 || BUILD_YM3526)
/*******************************************************************************/
/*              YM3812 local section                                                   */
/*******************************************************************************/

/* ---------- update one of chip ----------- */
void YM3812UpdateOne(FM_OPL *OPL, INT16 *buffer, int length) {
   int i;
   int data;
   OPLSAMPLE *buf = buffer;
   UINT32 amsCnt  = OPL->amsCnt;
   UINT32 vibCnt  = OPL->vibCnt;
   UINT8 rythm = OPL->rythm&0x20;
   OPL_CH *CH,*R_CH;

   if ( (void *)OPL != cur_chip ) {
      cur_chip = (void *)OPL;
      /* channel pointers */
      S_CH = OPL->P_CH;
      E_CH = &S_CH[9];
      /* rythm slot */
      SLOT7_1 = &S_CH[7].SLOT[SLOT1];
      SLOT7_2 = &S_CH[7].SLOT[SLOT2];
      SLOT8_1 = &S_CH[8].SLOT[SLOT1];
      SLOT8_2 = &S_CH[8].SLOT[SLOT2];
      /* LFO state */
      amsIncr = OPL->amsIncr;
      vibIncr = OPL->vibIncr;
      ams_table = OPL->ams_table;
      vib_table = OPL->vib_table;
   }
   R_CH = rythm ? &S_CH[6] : E_CH;
   for ( i=0; i < length ; i++ ) {
      /*            channel A         channel B         channel C      */
      /* LFO */
      ams = ams_table[(amsCnt+=amsIncr)>>AMS_SHIFT];
      vib = vib_table[(vibCnt+=vibIncr)>>VIB_SHIFT];
      outd[0] = 0;
      /* FM part */
      for (CH=S_CH ; CH < R_CH ; CH++)
         OPL_CALC_CH(CH);
      /* Rythn part */
      if (rythm)
         OPL_CALC_RH(S_CH);
      /* limit check */
      data = Limit( outd[0] , OPL_MAXOUT, OPL_MINOUT );
      /* store to sound buffer */
      buf[i] = data >> OPL_OUTSB;
   }

   OPL->amsCnt = amsCnt;
   OPL->vibCnt = vibCnt;
#ifdef OPL_OUTPUT_LOG
   if (opl_dbg_fp) {
      for (opl_dbg_chip=0;opl_dbg_chip<opl_dbg_maxchip;opl_dbg_chip++)
         if ( opl_dbg_opl[opl_dbg_chip] == OPL) break;
      fprintf(opl_dbg_fp,"%c%c%c",0x20+opl_dbg_chip,length&0xff,length/256);
   }
#endif
}
#endif /* (BUILD_YM3812 || BUILD_YM3526) */

#if BUILD_Y8950

void Y8950UpdateOne(FM_OPL *OPL, INT16 *buffer, int length) {
   int i;
   int data;
   OPLSAMPLE *buf = buffer;
   UINT32 amsCnt  = OPL->amsCnt;
   UINT32 vibCnt  = OPL->vibCnt;
   UINT8 rythm = OPL->rythm&0x20;
   OPL_CH *CH,*R_CH;
   YM_DELTAT *DELTAT = OPL->deltat;

   /* setup DELTA-T unit */
   YM_DELTAT_DECODE_PRESET(DELTAT);

   if ( (void *)OPL != cur_chip ) {
      cur_chip = (void *)OPL;
      /* channel pointers */
      S_CH = OPL->P_CH;
      E_CH = &S_CH[9];
      /* rythm slot */
      SLOT7_1 = &S_CH[7].SLOT[SLOT1];
      SLOT7_2 = &S_CH[7].SLOT[SLOT2];
      SLOT8_1 = &S_CH[8].SLOT[SLOT1];
      SLOT8_2 = &S_CH[8].SLOT[SLOT2];
      /* LFO state */
      amsIncr = OPL->amsIncr;
      vibIncr = OPL->vibIncr;
      ams_table = OPL->ams_table;
      vib_table = OPL->vib_table;
   }
   R_CH = rythm ? &S_CH[6] : E_CH;
   for ( i=0; i < length ; i++ ) {
      /*            channel A         channel B         channel C      */
      /* LFO */
      ams = ams_table[(amsCnt+=amsIncr)>>AMS_SHIFT];
      vib = vib_table[(vibCnt+=vibIncr)>>VIB_SHIFT];
      outd[0] = 0;
      /* deltaT ADPCM */
      if ( DELTAT->portstate )
         YM_DELTAT_ADPCM_CALC(DELTAT);
      /* FM part */
      for (CH=S_CH ; CH < R_CH ; CH++)
         OPL_CALC_CH(CH);
      /* Rythn part */
      if (rythm)
         OPL_CALC_RH(S_CH);
      /* limit check */
      data = Limit( outd[0] , OPL_MAXOUT, OPL_MINOUT );
      /* store to sound buffer */
      buf[i] = data >> OPL_OUTSB;
   }
   OPL->amsCnt = amsCnt;
   OPL->vibCnt = vibCnt;
   /* deltaT START flag */
   if ( !DELTAT->portstate )
      OPL->status &= 0xfe;
}
#endif

/* ---------- reset one of chip ---------- */
void OPLResetChip(FM_OPL *OPL) {
   int c,s;
   int i;

   /* reset chip */
   OPL->mode   = 0;     /* normal mode */
   OPL_STATUS_RESET(OPL,0x7f);
   /* reset with register write */
   OPLWriteReg(OPL,0x01,0); /* wabesel disable */
   OPLWriteReg(OPL,0x02,0); /* Timer1 */
   OPLWriteReg(OPL,0x03,0); /* Timer2 */
   OPLWriteReg(OPL,0x04,0); /* IRQ mask clear */
   for (i = 0xff ; i >= 0x20 ; i-- ) OPLWriteReg(OPL,i,0);
   /* reset OPerator paramater */
   for ( c = 0 ; c < OPL->max_ch ; c++ ) {
      OPL_CH *CH = &OPL->P_CH[c];
      /* OPL->P_CH[c].PAN = OPN_CENTER; */
      for (s = 0 ; s < 2 ; s++ ) {
         /* wave table */
         CH->SLOT[s].wavetable = &SIN_TABLE[0];
         /* CH->SLOT[s].evm = ENV_MOD_RR; */
         CH->SLOT[s].evc = EG_OFF;
         CH->SLOT[s].eve = EG_OFF+1;
         CH->SLOT[s].evs = 0;
      }
   }
#if BUILD_Y8950
   if (OPL->type&OPL_TYPE_ADPCM) {
      YM_DELTAT *DELTAT = OPL->deltat;

      DELTAT->freqbase = OPL->freqbase;
      DELTAT->output_pointer = outd;
      DELTAT->portshift = 5;
      DELTAT->output_range = DELTAT_MIXING_LEVEL<<TL_BITS;
      YM_DELTAT_ADPCM_Reset(DELTAT,0);
   }
#endif
}

/* ----------  Create one of vietual YM3812 ----------       */
/* 'rate'  is sampling rate and 'bufsiz' is the size of the  */
FM_OPL *OPLCreate(int type, int clock, int rate) {
   char *ptr;
   FM_OPL *OPL;
   int state_size;
   int max_ch = 9; /* normaly 9 channels */

   if ( OPL_LockTable() ==-1) return NULL;
   /* allocate OPL state space */
   state_size  = sizeof(FM_OPL);
   state_size += sizeof(OPL_CH)*max_ch;
#if BUILD_Y8950
   if (type&OPL_TYPE_ADPCM) state_size+= sizeof(YM_DELTAT);
#endif
   /* allocate memory block */
   ptr = (char *)malloc(state_size);
   if (ptr==NULL) return NULL;
   /* clear */
   memset(ptr,0,state_size);
   OPL        = (FM_OPL *)ptr;
   ptr+=sizeof(FM_OPL);
   OPL->P_CH  = (OPL_CH *)ptr;
   ptr+=sizeof(OPL_CH)*max_ch;
#if BUILD_Y8950
   if (type&OPL_TYPE_ADPCM) OPL->deltat = (YM_DELTAT *)ptr;
   ptr+=sizeof(YM_DELTAT);
#endif
   /* set channel state pointer */
   OPL->type  = type;
   OPL->clock = clock;
   OPL->rate  = rate;
   OPL->max_ch = max_ch;
   /* init grobal tables */
   OPL_initalize(OPL);
   /* reset chip */
   OPLResetChip(OPL);
#ifdef OPL_OUTPUT_LOG
   if (!opl_dbg_fp) {
      opl_dbg_fp = fopen("opllog.opl","wb");
      opl_dbg_maxchip = 0;
   }
   if (opl_dbg_fp) {
      opl_dbg_opl[opl_dbg_maxchip] = OPL;
      fprintf(opl_dbg_fp,"%c%c%c%c%c%c",0x00+opl_dbg_maxchip,
              type,
              clock&0xff,
              (clock/0x100)&0xff,
              (clock/0x10000)&0xff,
              (clock/0x1000000)&0xff);
      opl_dbg_maxchip++;
   }
#endif
   return OPL;
}

/* ----------  Destroy one of vietual YM3812 ----------       */
void OPLDestroy(FM_OPL *OPL) {
#ifdef OPL_OUTPUT_LOG
   if (opl_dbg_fp) {
      fclose(opl_dbg_fp);
      opl_dbg_fp = NULL;
   }
#endif
   OPL_UnLockTable();
   free(OPL);
}

/* ----------  Option handlers ----------       */

void OPLSetTimerHandler(FM_OPL *OPL,OPL_TIMERHANDLER TimerHandler,int channelOffset) {
   OPL->TimerHandler   = TimerHandler;
   OPL->TimerParam = channelOffset;
}
void OPLSetIRQHandler(FM_OPL *OPL,OPL_IRQHANDLER IRQHandler,int param) {
   OPL->IRQHandler     = IRQHandler;
   OPL->IRQParam = param;
}
void OPLSetUpdateHandler(FM_OPL *OPL,OPL_UPDATEHANDLER UpdateHandler,int param) {
   OPL->UpdateHandler = UpdateHandler;
   OPL->UpdateParam = param;
}
#if BUILD_Y8950
void OPLSetPortHandler(FM_OPL *OPL,OPL_PORTHANDLER_W PortHandler_w,OPL_PORTHANDLER_R PortHandler_r,int param) {
   OPL->porthandler_w = PortHandler_w;
   OPL->porthandler_r = PortHandler_r;
   OPL->port_param = param;
}

void OPLSetKeyboardHandler(FM_OPL *OPL,OPL_PORTHANDLER_W KeyboardHandler_w,OPL_PORTHANDLER_R KeyboardHandler_r,int param) {
   OPL->keyboardhandler_w = KeyboardHandler_w;
   OPL->keyboardhandler_r = KeyboardHandler_r;
   OPL->keyboard_param = param;
}
#endif
/* ---------- YM3812 I/O interface ---------- */
int OPLWrite(FM_OPL *OPL,int a,int v) {
   if ( !(a&1) ) {      /* address port */
      OPL->address = v & 0xff;
   } else {     /* data port */
      if (OPL->UpdateHandler) OPL->UpdateHandler(OPL->UpdateParam,0);
#ifdef OPL_OUTPUT_LOG
      if (opl_dbg_fp) {
         for (opl_dbg_chip=0;opl_dbg_chip<opl_dbg_maxchip;opl_dbg_chip++)
            if ( opl_dbg_opl[opl_dbg_chip] == OPL) break;
         fprintf(opl_dbg_fp,"%c%c%c",0x10+opl_dbg_chip,OPL->address,v);
      }
#endif
      OPLWriteReg(OPL,OPL->address,v);
   }
   return OPL->status>>7;
}

unsigned char OPLRead(FM_OPL *OPL,int a) {
   if ( !(a&1) ) {      /* status port */
      return OPL->status & (OPL->statusmask|0x80);
   }
   /* data port */
   switch (OPL->address) {
   case 0x05: /* KeyBoard IN */
      if (OPL->type&OPL_TYPE_KEYBOARD) {
         if (OPL->keyboardhandler_r)
            return OPL->keyboardhandler_r(OPL->keyboard_param);
         else
            LOG(LOG_WAR,("OPL:read unmapped KEYBOARD port\n"));
      }
      return 0;
#if 0
   case 0x0f: /* ADPCM-DATA  */
      return 0;
#endif
   case 0x19: /* I/O DATA    */
      if (OPL->type&OPL_TYPE_IO) {
         if (OPL->porthandler_r)
            return OPL->porthandler_r(OPL->port_param);
         else
            LOG(LOG_WAR,("OPL:read unmapped I/O port\n"));
      }
      return 0;
   case 0x1a: /* PCM-DATA    */
      return 0;
   }
   return 0;
}

int OPLTimerOver(FM_OPL *OPL,int c) {
   if ( c ) {   /* Timer B */
      OPL_STATUS_SET(OPL,0x20);
   } else {     /* Timer A */
      OPL_STATUS_SET(OPL,0x40);
      /* CSM mode key,TL controll */
      if ( OPL->mode & 0x80 ) { /* CSM mode total level latch and auto key on */
         int ch;
         if (OPL->UpdateHandler) OPL->UpdateHandler(OPL->UpdateParam,0);
         for (ch=0;ch<9;ch++)
            CSMKeyControll( &OPL->P_CH[ch] );
      }
   }
   /* reload timer */
   if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+c,(double)OPL->T[c]*OPL->TimerBase);
   return OPL->status>>7;
}