mirror of
https://github.com/holub/mame
synced 2025-05-31 18:11:50 +03:00
78622af0eb
recent cpu core changes. Specifically, it adds a fake device implementation similar to the one the cpu cores were using in 128u3 (i.e. it only provides the machine pointer and the token), and makes some interface adjustments aligned to 128u4 (i.e. adding snd_class_header, adding get_ to various getter functions). The primary benefit of this change is the removal of "deprecat.h" from 23 sound cores. I also adjusted ui.c to stop calling sndnum_clock and access the clock data similarly to how it does the cpu clock data. [AtariAce]
533 lines
12 KiB
C
533 lines
12 KiB
C
/*
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C140.c
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Simulator based on AMUSE sources.
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The C140 sound chip is used by Namco System 2 and System 21
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The 219 ASIC (which incorporates a modified C140) is used by Namco NA-1 and NA-2
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This chip controls 24 channels (C140) or 16 (219) of PCM.
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16 bytes are associated with each channel.
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Channels can be 8 bit signed PCM, or 12 bit signed PCM.
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Timer behavior is not yet handled.
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Unmapped registers:
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0x1f8:timer interval? (Nx0.1 ms)
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0x1fa:irq ack? timer restart?
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0x1fe:timer switch?(0:off 1:on)
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--------------
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ASIC "219" notes
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On the 219 ASIC used on NA-1 and NA-2, the high registers have the following
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meaning instead:
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0x1f7: bank for voices 0-3
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0x1f1: bank for voices 4-7
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0x1f3: bank for voices 8-11
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0x1f5: bank for voices 12-15
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Some games (bkrtmaq, xday2) write to 0x1fd for voices 12-15 instead. Probably the bank registers
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mirror at 1f8, in which case 1ff is also 0-3, 1f9 is also 4-7, 1fb is also 8-11, and 1fd is also 12-15.
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Each bank is 0x20000 (128k), and the voice addresses on the 219 are all multiplied by 2.
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Additionally, the 219's base pitch is the same as the C352's (42667). But these changes
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are IMO not sufficient to make this a separate file - all the other registers are
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fully compatible.
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Finally, the 219 only has 16 voices.
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*/
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/*
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2000.06.26 CAB fixed compressed pcm playback
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2002.07.20 R.Belmont added support for multiple banking types
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2006.01.08 R.Belmont added support for NA-1/2 "219" derivative
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*/
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#include <math.h>
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#include "sndintrf.h"
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#include "streams.h"
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#include "c140.h"
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#define MAX_VOICE 24
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struct voice_registers
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{
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UINT8 volume_right;
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UINT8 volume_left;
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UINT8 frequency_msb;
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UINT8 frequency_lsb;
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UINT8 bank;
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UINT8 mode;
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UINT8 start_msb;
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UINT8 start_lsb;
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UINT8 end_msb;
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UINT8 end_lsb;
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UINT8 loop_msb;
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UINT8 loop_lsb;
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UINT8 reserved[4];
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};
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typedef struct
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{
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long ptoffset;
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long pos;
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long key;
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//--work
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long lastdt;
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long prevdt;
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long dltdt;
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//--reg
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long rvol;
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long lvol;
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long frequency;
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long bank;
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long mode;
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long sample_start;
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long sample_end;
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long sample_loop;
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} VOICE;
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struct c140_info
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{
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int sample_rate;
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sound_stream *stream;
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int banking_type;
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/* internal buffers */
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INT16 *mixer_buffer_left;
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INT16 *mixer_buffer_right;
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int baserate;
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void *pRom;
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UINT8 REG[0x200];
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INT16 pcmtbl[8]; //2000.06.26 CAB
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VOICE voi[MAX_VOICE];
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};
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static void init_voice( VOICE *v )
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{
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v->key=0;
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v->ptoffset=0;
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v->rvol=0;
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v->lvol=0;
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v->frequency=0;
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v->bank=0;
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v->mode=0;
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v->sample_start=0;
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v->sample_end=0;
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v->sample_loop=0;
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}
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READ8_HANDLER( c140_r )
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{
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struct c140_info *info = sndti_token(SOUND_C140, 0);
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offset&=0x1ff;
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return info->REG[offset];
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}
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/*
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find_sample: compute the actual address of a sample given it's
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address and banking registers, as well as the board type.
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I suspect in "real life" this works like the Sega MultiPCM where the banking
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is done by a small PAL or GAL external to the sound chip, which can be switched
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per-game or at least per-PCB revision as addressing range needs grow.
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*/
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static long find_sample(struct c140_info *info, long adrs, long bank, int voice)
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{
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long newadr = 0;
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static const INT16 asic219banks[4] = { 0x1f7, 0x1f1, 0x1f3, 0x1f5 };
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adrs=(bank<<16)+adrs;
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switch (info->banking_type)
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{
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case C140_TYPE_SYSTEM2:
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// System 2 banking
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newadr = ((adrs&0x200000)>>2)|(adrs&0x7ffff);
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break;
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case C140_TYPE_SYSTEM21_A:
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// System 21 type A (simple) banking.
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// similar to System 2's.
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newadr = ((adrs&0x300000)>>1)+(adrs&0x7ffff);
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break;
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case C140_TYPE_SYSTEM21_B:
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// System 21 type B (chip select) banking
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// get base address of sample inside the bank
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newadr = ((adrs&0x100000)>>2) + (adrs&0x3ffff);
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// now add the starting bank offsets based on the 2
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// chip select bits.
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// 0x40000 picks individual 512k ROMs
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if (adrs & 0x40000)
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{
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newadr += 0x80000;
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}
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// and 0x200000 which group of chips...
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if (adrs & 0x200000)
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{
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newadr += 0x100000;
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}
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break;
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case C140_TYPE_ASIC219:
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// ASIC219's banking is fairly simple
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newadr = ((info->REG[asic219banks[voice/4]]&0x3) * 0x20000) + adrs;
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break;
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}
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return (newadr);
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}
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WRITE8_HANDLER( c140_w )
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{
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struct c140_info *info = sndti_token(SOUND_C140, 0);
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stream_update(info->stream);
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offset&=0x1ff;
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// mirror the bank registers on the 219, fixes bkrtmaq (and probably xday2 based on notes in the HLE)
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if ((offset >= 0x1f8) && (info->banking_type == C140_TYPE_ASIC219))
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{
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offset -= 8;
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}
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info->REG[offset]=data;
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if( offset<0x180 )
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{
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VOICE *v = &info->voi[offset>>4];
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if( (offset&0xf)==0x5 )
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{
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if( data&0x80 )
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{
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const struct voice_registers *vreg = (struct voice_registers *) &info->REG[offset&0x1f0];
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v->key=1;
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v->ptoffset=0;
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v->pos=0;
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v->lastdt=0;
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v->prevdt=0;
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v->dltdt=0;
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v->bank = vreg->bank;
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v->mode = data;
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// on the 219 asic, addresses are in words
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if (info->banking_type == C140_TYPE_ASIC219)
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{
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v->sample_loop = (vreg->loop_msb*256 + vreg->loop_lsb)*2;
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v->sample_start = (vreg->start_msb*256 + vreg->start_lsb)*2;
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v->sample_end = (vreg->end_msb*256 + vreg->end_lsb)*2;
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#if 0
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logerror("219: play v %d mode %02x start %x loop %x end %x\n",
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offset>>4, v->mode,
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find_sample(info, v->sample_start, v->bank, offset>>4),
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find_sample(info, v->sample_loop, v->bank, offset>>4),
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find_sample(info, v->sample_end, v->bank, offset>>4));
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#endif
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}
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else
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{
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v->sample_loop = vreg->loop_msb*256 + vreg->loop_lsb;
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v->sample_start = vreg->start_msb*256 + vreg->start_lsb;
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v->sample_end = vreg->end_msb*256 + vreg->end_lsb;
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}
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}
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else
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{
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v->key=0;
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}
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}
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}
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}
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void c140_set_base(int which, void *base)
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{
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struct c140_info *info = sndti_token(SOUND_C140, 0);
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info->pRom = base;
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}
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INLINE int limit(INT32 in)
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{
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if(in>0x7fff) return 0x7fff;
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else if(in<-0x8000) return -0x8000;
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return in;
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}
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static void update_stereo(void *param, stream_sample_t **inputs, stream_sample_t **buffer, int length)
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{
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struct c140_info *info = param;
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int i,j;
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INT32 rvol,lvol;
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INT32 dt;
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INT32 sdt;
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INT32 st,ed,sz;
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INT8 *pSampleData;
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INT32 frequency,delta,offset,pos;
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INT32 cnt, voicecnt;
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INT32 lastdt,prevdt,dltdt;
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float pbase=(float)info->baserate*2.0 / (float)info->sample_rate;
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INT16 *lmix, *rmix;
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if(length>info->sample_rate) length=info->sample_rate;
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/* zap the contents of the mixer buffer */
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memset(info->mixer_buffer_left, 0, length * sizeof(INT16));
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memset(info->mixer_buffer_right, 0, length * sizeof(INT16));
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/* get the number of voices to update */
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voicecnt = (info->banking_type == C140_TYPE_ASIC219) ? 16 : 24;
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//--- audio update
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for( i=0;i<voicecnt;i++ )
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{
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VOICE *v = &info->voi[i];
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const struct voice_registers *vreg = (struct voice_registers *)&info->REG[i*16];
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if( v->key )
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{
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frequency= vreg->frequency_msb*256 + vreg->frequency_lsb;
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/* Abort voice if no frequency value set */
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if(frequency==0) continue;
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/* Delta = frequency * ((8MHz/374)*2 / sample rate) */
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delta=(long)((float)frequency * pbase);
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/* Calculate left/right channel volumes */
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lvol=(vreg->volume_left*32)/MAX_VOICE; //32ch -> 24ch
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rvol=(vreg->volume_right*32)/MAX_VOICE;
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/* Set mixer buffer base pointers */
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lmix = info->mixer_buffer_left;
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rmix = info->mixer_buffer_right;
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/* Retrieve sample start/end and calculate size */
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st=v->sample_start;
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ed=v->sample_end;
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sz=ed-st;
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/* Retrieve base pointer to the sample data */
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pSampleData=(signed char*)((FPTR)info->pRom + find_sample(info, st, v->bank, i));
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/* Fetch back previous data pointers */
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offset=v->ptoffset;
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pos=v->pos;
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lastdt=v->lastdt;
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prevdt=v->prevdt;
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dltdt=v->dltdt;
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/* Switch on data type - compressed PCM is only for C140 */
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if ((v->mode&8) && (info->banking_type != C140_TYPE_ASIC219))
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{
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//compressed PCM (maybe correct...)
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/* Loop for enough to fill sample buffer as requested */
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for(j=0;j<length;j++)
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{
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offset += delta;
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cnt = (offset>>16)&0x7fff;
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offset &= 0xffff;
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pos+=cnt;
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//for(;cnt>0;cnt--)
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{
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/* Check for the end of the sample */
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if(pos >= sz)
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{
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/* Check if its a looping sample, either stop or loop */
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if(v->mode&0x10)
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{
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pos = (v->sample_loop - st);
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}
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else
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{
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v->key=0;
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break;
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}
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}
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/* Read the chosen sample byte */
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dt=pSampleData[pos];
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/* decompress to 13bit range */ //2000.06.26 CAB
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sdt=dt>>3; //signed
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if(sdt<0) sdt = (sdt<<(dt&7)) - info->pcmtbl[dt&7];
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else sdt = (sdt<<(dt&7)) + info->pcmtbl[dt&7];
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prevdt=lastdt;
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lastdt=sdt;
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dltdt=(lastdt - prevdt);
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}
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/* Caclulate the sample value */
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dt=((dltdt*offset)>>16)+prevdt;
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/* Write the data to the sample buffers */
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*lmix++ +=(dt*lvol)>>(5+5);
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*rmix++ +=(dt*rvol)>>(5+5);
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}
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}
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else
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{
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/* linear 8bit signed PCM */
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for(j=0;j<length;j++)
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{
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offset += delta;
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cnt = (offset>>16)&0x7fff;
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offset &= 0xffff;
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pos += cnt;
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/* Check for the end of the sample */
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if(pos >= sz)
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{
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/* Check if its a looping sample, either stop or loop */
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if( v->mode&0x10 )
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{
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pos = (v->sample_loop - st);
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}
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else
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{
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v->key=0;
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break;
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}
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}
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if( cnt )
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{
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prevdt=lastdt;
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if (info->banking_type == C140_TYPE_ASIC219)
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{
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lastdt = pSampleData[BYTE_XOR_BE(pos)];
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// Sign + magnitude format
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if ((v->mode & 0x01) && (lastdt & 0x80))
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lastdt = -(lastdt & 0x7f);
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// Sign flip
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if (v->mode & 0x40)
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lastdt = -lastdt;
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}
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else
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{
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lastdt=pSampleData[pos];
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}
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dltdt = (lastdt - prevdt);
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}
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/* Caclulate the sample value */
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dt=((dltdt*offset)>>16)+prevdt;
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/* Write the data to the sample buffers */
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*lmix++ +=(dt*lvol)>>5;
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*rmix++ +=(dt*rvol)>>5;
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}
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}
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/* Save positional data for next callback */
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v->ptoffset=offset;
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v->pos=pos;
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v->lastdt=lastdt;
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v->prevdt=prevdt;
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v->dltdt=dltdt;
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}
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}
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/* render to MAME's stream buffer */
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lmix = info->mixer_buffer_left;
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rmix = info->mixer_buffer_right;
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{
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stream_sample_t *dest1 = buffer[0];
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stream_sample_t *dest2 = buffer[1];
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for (i = 0; i < length; i++)
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{
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*dest1++ = limit(8*(*lmix++));
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*dest2++ = limit(8*(*rmix++));
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}
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}
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}
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static SND_START( c140 )
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{
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const c140_interface *intf = config;
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struct c140_info *info;
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info = auto_malloc(sizeof(*info));
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memset(info, 0, sizeof(*info));
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info->sample_rate=info->baserate=clock;
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info->banking_type = intf->banking_type;
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info->stream = stream_create(0,2,info->sample_rate,info,update_stereo);
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info->pRom=memory_region(device->machine, tag);
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/* make decompress pcm table */ //2000.06.26 CAB
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{
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int i;
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INT32 segbase=0;
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for(i=0;i<8;i++)
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{
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info->pcmtbl[i]=segbase; //segment base value
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segbase += 16<<i;
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}
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}
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memset(info->REG,0,sizeof(info->REG));
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{
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int i;
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for(i=0;i<MAX_VOICE;i++) init_voice( &info->voi[i] );
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}
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/* allocate a pair of buffers to mix into - 1 second's worth should be more than enough */
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info->mixer_buffer_left = auto_malloc(2 * sizeof(INT16)*info->sample_rate );
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info->mixer_buffer_right = info->mixer_buffer_left + info->sample_rate;
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return info;
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}
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/**************************************************************************
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* Generic get_info
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**************************************************************************/
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static SND_SET_INFO( c140 )
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{
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switch (state)
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{
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/* no parameters to set */
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}
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}
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SND_GET_INFO( c140 )
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{
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switch (state)
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{
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/* --- the following bits of info are returned as 64-bit signed integers --- */
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/* --- the following bits of info are returned as pointers to data or functions --- */
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case SNDINFO_PTR_SET_INFO: info->set_info = SND_SET_INFO_NAME( c140 ); break;
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case SNDINFO_PTR_START: info->start = SND_START_NAME( c140 ); break;
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case SNDINFO_PTR_STOP: /* nothing */ break;
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case SNDINFO_PTR_RESET: /* nothing */ break;
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/* --- the following bits of info are returned as NULL-terminated strings --- */
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case SNDINFO_STR_NAME: info->s = "C140"; break;
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case SNDINFO_STR_CORE_FAMILY: info->s = "Namco PCM"; break;
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case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; break;
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case SNDINFO_STR_CORE_FILE: info->s = __FILE__; break;
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case SNDINFO_STR_CORE_CREDITS: info->s = "Copyright Nicola Salmoria and the MAME Team"; break;
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}
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}
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