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Diffstat (limited to 'src/devices/sound/multipcm.c')
-rw-r--r-- | src/devices/sound/multipcm.c | 658 |
1 files changed, 658 insertions, 0 deletions
diff --git a/src/devices/sound/multipcm.c b/src/devices/sound/multipcm.c new file mode 100644 index 00000000000..69c164bad2c --- /dev/null +++ b/src/devices/sound/multipcm.c @@ -0,0 +1,658 @@ +// license:BSD-3-Clause +// copyright-holders:Miguel Angel Horna +/* + * Sega System 32 Multi/Model 1/Model 2 custom PCM chip (315-5560) emulation. + * + * by Miguel Angel Horna (ElSemi) for Model 2 Emulator and MAME. + * Information by R. Belmont and the YMF278B (OPL4) manual. + * + * voice registers: + * 0: Pan + * 1: Index of sample + * 2: LSB of pitch (low 2 bits seem unused so) + * 3: MSB of pitch (ooooppppppppppxx) (o=octave (4 bit signed), p=pitch (10 bits), x=unused? + * 4: voice control: top bit = 1 for key on, 0 for key off + * 5: bit 0: 0: interpolate volume changes, 1: direct set volume, + bits 1-7 = volume attenuate (0=max, 7f=min) + * 6: LFO frequency + Phase LFO depth + * 7: Amplitude LFO size + * + * The first sample ROM contains a variable length table with 12 + * bytes per instrument/sample. 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 LFO freq + depth (copied to reg 6 ?) + * The next 3 are envelope params (Attack, Decay1 and 2, sustain level, release, Key Rate Scaling) + * The next byte is Amplitude LFO size (copied to reg 7 ?) + * + * TODO + * - The YM278B manual states that the chip supports 512 instruments. The MultiPCM probably supports them + * too but the high bit position is unknown (probably reg 2 low bit). Any game use more than 256? + * + */ + +#include "emu.h" +#include "multipcm.h" + +//???? +#define MULTIPCM_CLOCKDIV (180.0f) + +ALLOW_SAVE_TYPE(STATE); // allow save_item on a non-fundamental type + +static signed int LPANTABLE[0x800],RPANTABLE[0x800]; + +#define FIX(v) ((UINT32) ((float) (1<<SHIFT)*(v))) + +static const int val2chan[] = +{ + 0, 1, 2, 3, 4, 5, 6 , -1, + 7, 8, 9, 10,11,12,13, -1, + 14,15,16,17,18,19,20, -1, + 21,22,23,24,25,26,27, -1, +}; + + +#define SHIFT 12 + + +#define MULTIPCM_RATE 44100.0 + + + + +/******************************* + ENVELOPE SECTION +*******************************/ + +//Times are based on a 44100Hz timebase. It's adjusted to the actual sampling rate on startup + +static const double BaseTimes[64]={0,0,0,0,6222.95,4978.37,4148.66,3556.01,3111.47,2489.21,2074.33,1778.00,1555.74,1244.63,1037.19,889.02, +777.87,622.31,518.59,444.54,388.93,311.16,259.32,222.27,194.47,155.60,129.66,111.16,97.23,77.82,64.85,55.60, +48.62,38.91,32.43,27.80,24.31,19.46,16.24,13.92,12.15,9.75,8.12,6.98,6.08,4.90,4.08,3.49, +3.04,2.49,2.13,1.90,1.72,1.41,1.18,1.04,0.91,0.73,0.59,0.50,0.45,0.45,0.45,0.45}; +#define AR2DR 14.32833 +static signed int lin2expvol[0x400]; +static int TLSteps[2]; + +#define EG_SHIFT 16 + +static int EG_Update(SLOT *slot) +{ + switch(slot->EG.state) + { + case ATTACK: + slot->EG.volume+=slot->EG.AR; + if(slot->EG.volume>=(0x3ff<<EG_SHIFT)) + { + slot->EG.state=DECAY1; + if(slot->EG.D1R>=(0x400<<EG_SHIFT)) //Skip DECAY1, go directly to DECAY2 + slot->EG.state=DECAY2; + slot->EG.volume=0x3ff<<EG_SHIFT; + } + break; + case DECAY1: + slot->EG.volume-=slot->EG.D1R; + if(slot->EG.volume<=0) + slot->EG.volume=0; + if(slot->EG.volume>>EG_SHIFT<=(slot->EG.DL<<(10-4))) + slot->EG.state=DECAY2; + break; + case DECAY2: + slot->EG.volume-=slot->EG.D2R; + if(slot->EG.volume<=0) + slot->EG.volume=0; + break; + case RELEASE: + slot->EG.volume-=slot->EG.RR; + if(slot->EG.volume<=0) + { + slot->EG.volume=0; + slot->Playing=0; + } + break; + default: + return 1<<SHIFT; + } + return lin2expvol[slot->EG.volume>>EG_SHIFT]; +} + +static unsigned int Get_RATE(unsigned int *Steps,unsigned int rate,unsigned int val) +{ + int r=4*val+rate; + if(val==0) + return Steps[0]; + if(val==0xf) + return Steps[0x3f]; + if(r>0x3f) + r=0x3f; + return Steps[r]; +} + +void multipcm_device::EG_Calc(SLOT *slot) +{ + int octave=((slot->Regs[3]>>4)-1)&0xf; + int rate; + if(octave&8) octave=octave-16; + if(slot->Sample->KRS!=0xf) + rate=(octave+slot->Sample->KRS)*2+((slot->Regs[3]>>3)&1); + else + rate=0; + + slot->EG.AR=Get_RATE(m_ARStep,rate,slot->Sample->AR); + slot->EG.D1R=Get_RATE(m_DRStep,rate,slot->Sample->DR1); + slot->EG.D2R=Get_RATE(m_DRStep,rate,slot->Sample->DR2); + slot->EG.RR=Get_RATE(m_DRStep,rate,slot->Sample->RR); + slot->EG.DL=0xf-slot->Sample->DL; + +} + +/***************************** + LFO SECTION +*****************************/ + +#define LFO_SHIFT 8 + + +#define LFIX(v) ((unsigned int) ((float) (1<<LFO_SHIFT)*(v))) + +//Convert DB to multiply amplitude +#define DB(v) LFIX(powf(10.0f,v/20.0f)) + +//Convert cents to step increment +#define CENTS(v) LFIX(powf(2.0f,v/1200.0f)) + +static int PLFO_TRI[256]; +static int ALFO_TRI[256]; + +static const float LFOFreq[8]={0.168f,2.019f,3.196f,4.206f,5.215f,5.888f,6.224f,7.066f}; //Hz; +static const float PSCALE[8]={0.0f,3.378f,5.065f,6.750f,10.114f,20.170f,40.180f,79.307f}; //cents +static const float ASCALE[8]={0.0f,0.4f,0.8f,1.5f,3.0f,6.0f,12.0f,24.0f}; //DB +static int PSCALES[8][256]; +static int ASCALES[8][256]; + +static void LFO_Init(void) +{ + int i,s; + for(i=0;i<256;++i) + { + int a; //amplitude + int p; //phase + + //Tri + if(i<128) + a=255-(i*2); + else + a=(i*2)-256; + if(i<64) + p=i*2; + else if(i<128) + p=255-i*2; + else if(i<192) + p=256-i*2; + else + p=i*2-511; + ALFO_TRI[i]=a; + PLFO_TRI[i]=p; + } + + for(s=0;s<8;++s) + { + float limit=PSCALE[s]; + for(i=-128;i<128;++i) + { + PSCALES[s][i+128]=CENTS(((limit*(float) i)/128.0f)); + } + limit=-ASCALE[s]; + for(i=0;i<256;++i) + { + ASCALES[s][i]=DB(((limit*(float) i)/256.0f)); + } + } +} + +INLINE signed int PLFO_Step(LFO_t *LFO) +{ + int p; + LFO->phase+=LFO->phase_step; + p=LFO->table[(LFO->phase>>LFO_SHIFT)&0xff]; + p=LFO->scale[p+128]; + return p<<(SHIFT-LFO_SHIFT); +} + +INLINE signed int ALFO_Step(LFO_t *LFO) +{ + int p; + LFO->phase+=LFO->phase_step; + p=LFO->table[(LFO->phase>>LFO_SHIFT)&0xff]; + p=LFO->scale[p]; + return p<<(SHIFT-LFO_SHIFT); +} + +void multipcm_device::LFO_ComputeStep(LFO_t *LFO,UINT32 LFOF,UINT32 LFOS,int ALFO) +{ + float step=(float) LFOFreq[LFOF]*256.0f/(float) m_Rate; + LFO->phase_step=(unsigned int) ((float) (1<<LFO_SHIFT)*step); + if(ALFO) + { + LFO->table=ALFO_TRI; + LFO->scale=ASCALES[LFOS]; + } + else + { + LFO->table=PLFO_TRI; + LFO->scale=PSCALES[LFOS]; + } +} + + + +void multipcm_device::WriteSlot(SLOT *slot,int reg,unsigned char data) +{ + slot->Regs[reg]=data; + + switch(reg) + { + case 0: //PANPOT + slot->Pan=(data>>4)&0xf; + break; + case 1: //Sample + //according to YMF278 sample write causes some base params written to the regs (envelope+lfos) + //the game should never change the sample while playing. + { + Sample_t *Sample=m_Samples+slot->Regs[1]; + WriteSlot(slot,6,Sample->LFOVIB); + WriteSlot(slot,7,Sample->AM); + } + break; + case 2: //Pitch + case 3: + { + unsigned int oct=((slot->Regs[3]>>4)-1)&0xf; + unsigned int pitch=((slot->Regs[3]&0xf)<<6)|(slot->Regs[2]>>2); + pitch=m_FNS_Table[pitch]; + if(oct&0x8) + pitch>>=(16-oct); + else + pitch<<=oct; + slot->step=pitch/m_Rate; + } + break; + case 4: //KeyOn/Off (and more?) + { + if(data&0x80) //KeyOn + { + slot->Sample=m_Samples+slot->Regs[1]; + slot->Playing=1; + slot->Base=slot->Sample->Start; + slot->offset=0; + slot->Prev=0; + slot->TL=slot->DstTL<<SHIFT; + + EG_Calc(slot); + slot->EG.state=ATTACK; + slot->EG.volume=0; + + if(slot->Base>=0x100000) + { + if(slot->Pan&8) + slot->Base=(slot->Base&0xfffff)|(m_BankL); + else + slot->Base=(slot->Base&0xfffff)|(m_BankR); + } + + } + else + { + if(slot->Playing) + { + if(slot->Sample->RR!=0xf) + slot->EG.state=RELEASE; + else + slot->Playing=0; + } + } + } + break; + case 5: //TL+Interpolation + { + slot->DstTL=(data>>1)&0x7f; + if(!(data&1)) //Interpolate TL + { + if((slot->TL>>SHIFT)>slot->DstTL) + slot->TLStep=TLSteps[0]; //decrease + else + slot->TLStep=TLSteps[1]; //increase + } + else + slot->TL=slot->DstTL<<SHIFT; + } + break; + case 6: //LFO freq+PLFO + { + if(data) + { + LFO_ComputeStep(&(slot->PLFO),(slot->Regs[6]>>3)&7,slot->Regs[6]&7,0); + LFO_ComputeStep(&(slot->ALFO),(slot->Regs[6]>>3)&7,slot->Regs[7]&7,1); + } + } + break; + case 7: //ALFO + { + if(data) + { + LFO_ComputeStep(&(slot->PLFO),(slot->Regs[6]>>3)&7,slot->Regs[6]&7,0); + LFO_ComputeStep(&(slot->ALFO),(slot->Regs[6]>>3)&7,slot->Regs[7]&7,1); + } + } + break; + } +} + +READ8_MEMBER( multipcm_device::read ) +{ + return 0; +} + + +WRITE8_MEMBER( multipcm_device::write ) +{ + switch(offset) + { + case 0: //Data write + WriteSlot(m_Slots+m_CurSlot,m_Address,data); + break; + case 1: + m_CurSlot=val2chan[data&0x1f]; + break; + + case 2: + m_Address=(data>7)?7:data; + break; + } +} + +/* MAME/M1 access functions */ + +void multipcm_device::set_bank(UINT32 leftoffs, UINT32 rightoffs) +{ + m_BankL = leftoffs; + m_BankR = rightoffs; +} + +const device_type MULTIPCM = &device_creator<multipcm_device>; + +// default address map +static ADDRESS_MAP_START( multipcm, AS_0, 8, multipcm_device ) + AM_RANGE(0x000000, 0x3fffff) AM_ROM +ADDRESS_MAP_END + +multipcm_device::multipcm_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MULTIPCM, "Sega/Yamaha 315-5560", tag, owner, clock, "multipcm", __FILE__), + device_sound_interface(mconfig, *this), + device_memory_interface(mconfig, *this), + m_space_config("mpcm_samples", ENDIANNESS_LITTLE, 8, 24, 0, NULL), + m_stream(NULL), + //m_Samples(0x200), + //m_Slots[28], + m_CurSlot(0), + m_Address(0), + m_BankR(0), + m_BankL(0), + m_Rate(0) + //m_ARStep(0), + //m_DRStep(0), + //m_FNS_Table(0) +{ + m_address_map[0] = *ADDRESS_MAP_NAME(multipcm); +} + +//------------------------------------------------- +// memory_space_config - return a description of +// any address spaces owned by this device +//------------------------------------------------- + +const address_space_config *multipcm_device::memory_space_config(address_spacenum spacenum) const +{ + return (spacenum == 0) ? &m_space_config : NULL; +} + +//------------------------------------------------- +// device_config_complete - perform any +// operations now that the configuration is +// complete +//------------------------------------------------- + +void multipcm_device::device_config_complete() +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void multipcm_device::device_start() +{ + int i; + + // find our direct access + m_direct = &space().direct(); + + m_Rate=(float) clock() / MULTIPCM_CLOCKDIV; + + m_stream = machine().sound().stream_alloc(*this, 0, 2, m_Rate); + + //Volume+pan table + for(i=0;i<0x800;++i) + { + float SegaDB=0; + float TL; + float LPAN,RPAN; + + unsigned char iTL=i&0x7f; + unsigned char iPAN=(i>>7)&0xf; + + SegaDB=(float) iTL*(-24.0f)/(float) 0x40; + + TL=powf(10.0f,SegaDB/20.0f); + + + if(iPAN==0x8) + { + LPAN=RPAN=0.0; + } + else if(iPAN==0x0) + { + LPAN=RPAN=1.0; + } + else if(iPAN&0x8) + { + LPAN=1.0; + + iPAN=0x10-iPAN; + + SegaDB=(float) iPAN*(-12.0f)/(float) 0x4; + + RPAN=pow(10.0f,SegaDB/20.0f); + + if((iPAN&0x7)==7) + RPAN=0.0; + } + else + { + RPAN=1.0; + + SegaDB=(float) iPAN*(-12.0f)/(float) 0x4; + + LPAN=pow(10.0f,SegaDB/20.0f); + if((iPAN&0x7)==7) + LPAN=0.0; + } + + TL/=4.0f; + + LPANTABLE[i]=FIX((LPAN*TL)); + RPANTABLE[i]=FIX((RPAN*TL)); + } + + //Pitch steps + for(i=0;i<0x400;++i) + { + float fcent=m_Rate*(1024.0f+(float) i)/1024.0f; + m_FNS_Table[i]=(unsigned int ) ((float) (1<<SHIFT) *fcent); + } + + //Envelope steps + for(i=0;i<0x40;++i) + { + //Times are based on 44100 clock, adjust to real chip clock + m_ARStep[i]=(float) (0x400<<EG_SHIFT)/(float)(BaseTimes[i]*44100.0/(1000.0)); + m_DRStep[i]=(float) (0x400<<EG_SHIFT)/(float)(BaseTimes[i]*AR2DR*44100.0/(1000.0)); + } + m_ARStep[0]=m_ARStep[1]=m_ARStep[2]=m_ARStep[3]=0; + m_ARStep[0x3f]=0x400<<EG_SHIFT; + m_DRStep[0]=m_DRStep[1]=m_DRStep[2]=m_DRStep[3]=0; + + //TL Interpolation steps + //lower + TLSteps[0]=-(float) (0x80<<SHIFT)/(78.2f*44100.0f/1000.0f); + //raise + TLSteps[1]=(float) (0x80<<SHIFT)/(78.2f*2*44100.0f/1000.0f); + + //build the linear->exponential ramps + for(i=0;i<0x400;++i) + { + float db=-(96.0f-(96.0f*(float) i/(float) 0x400)); + lin2expvol[i]=powf(10.0f,db/20.0f)*(float) (1<<SHIFT); + } + + + for(i=0;i<512;++i) + { + UINT8 ptSample[12]; + + for (int j = 0; j < 12; j++) + { + ptSample[j] = (UINT8)m_direct->read_byte((i*12) + j); + } + + m_Samples[i].Start=(ptSample[0]<<16)|(ptSample[1]<<8)|(ptSample[2]<<0); + m_Samples[i].Loop=(ptSample[3]<<8)|(ptSample[4]<<0); + m_Samples[i].End=0xffff-((ptSample[5]<<8)|(ptSample[6]<<0)); + m_Samples[i].LFOVIB=ptSample[7]; + m_Samples[i].DR1=ptSample[8]&0xf; + m_Samples[i].AR=(ptSample[8]>>4)&0xf; + m_Samples[i].DR2=ptSample[9]&0xf; + m_Samples[i].DL=(ptSample[9]>>4)&0xf; + m_Samples[i].RR=ptSample[10]&0xf; + m_Samples[i].KRS=(ptSample[10]>>4)&0xf; + m_Samples[i].AM=ptSample[11]; + } + + save_item(NAME(m_CurSlot)); + save_item(NAME(m_Address)); + save_item(NAME(m_BankL)); + save_item(NAME(m_BankR)); + + for(i=0;i<28;++i) + { + m_Slots[i].Num=i; + m_Slots[i].Playing=0; + + save_item(NAME(m_Slots[i].Num), i); + save_item(NAME(m_Slots[i].Regs), i); + save_item(NAME(m_Slots[i].Playing), i); + save_item(NAME(m_Slots[i].Base), i); + save_item(NAME(m_Slots[i].offset), i); + save_item(NAME(m_Slots[i].step), i); + save_item(NAME(m_Slots[i].Pan), i); + save_item(NAME(m_Slots[i].TL), i); + save_item(NAME(m_Slots[i].DstTL), i); + save_item(NAME(m_Slots[i].TLStep), i); + save_item(NAME(m_Slots[i].Prev), i); + save_item(NAME(m_Slots[i].EG.volume), i); + save_item(NAME(m_Slots[i].EG.state), i); + save_item(NAME(m_Slots[i].EG.step), i); + save_item(NAME(m_Slots[i].EG.AR), i); + save_item(NAME(m_Slots[i].EG.D1R), i); + save_item(NAME(m_Slots[i].EG.D2R), i); + save_item(NAME(m_Slots[i].EG.RR), i); + save_item(NAME(m_Slots[i].EG.DL), i); + save_item(NAME(m_Slots[i].PLFO.phase), i); + save_item(NAME(m_Slots[i].PLFO.phase_step), i); + save_item(NAME(m_Slots[i].ALFO.phase), i); + save_item(NAME(m_Slots[i].ALFO.phase_step), i); + } + + LFO_Init(); +} + +//------------------------------------------------- +// sound_stream_update - handle a stream update +//------------------------------------------------- + +void multipcm_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) +{ + stream_sample_t *datap[2]; + int i,sl; + + datap[0] = outputs[0]; + datap[1] = outputs[1]; + + memset(datap[0], 0, sizeof(*datap[0])*samples); + memset(datap[1], 0, sizeof(*datap[1])*samples); + + for(i=0;i<samples;++i) + { + signed int smpl=0; + signed int smpr=0; + for(sl=0;sl<28;++sl) + { + SLOT *slot=m_Slots+sl; + if(slot->Playing) + { + unsigned int vol=(slot->TL>>SHIFT)|(slot->Pan<<7); + unsigned int adr=slot->offset>>SHIFT; + signed int sample; + unsigned int step=slot->step; + signed int csample=(signed short) (m_direct->read_byte(slot->Base+adr)<<8); + signed int fpart=slot->offset&((1<<SHIFT)-1); + sample=(csample*fpart+slot->Prev*((1<<SHIFT)-fpart))>>SHIFT; + + if(slot->Regs[6]&7) //Vibrato enabled + { + step=step*PLFO_Step(&(slot->PLFO)); + step>>=SHIFT; + } + + slot->offset+=step; + if(slot->offset>=(slot->Sample->End<<SHIFT)) + { + slot->offset=slot->Sample->Loop<<SHIFT; + } + if(adr^(slot->offset>>SHIFT)) + { + slot->Prev=csample; + } + + if((slot->TL>>SHIFT)!=slot->DstTL) + slot->TL+=slot->TLStep; + + if(slot->Regs[7]&7) //Tremolo enabled + { + sample=sample*ALFO_Step(&(slot->ALFO)); + sample>>=SHIFT; + } + + sample=(sample*EG_Update(slot))>>10; + + smpl+=(LPANTABLE[vol]*sample)>>SHIFT; + smpr+=(RPANTABLE[vol]*sample)>>SHIFT; + } + } +#define ICLIP16(x) (x<-32768)?-32768:((x>32767)?32767:x) + datap[0][i]=ICLIP16(smpl); + datap[1][i]=ICLIP16(smpr); + } +} |