475 lines
11 KiB
C
475 lines
11 KiB
C
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/*********************************************************/
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/* ricoh RF5C68(or clone) PCM controller */
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/*********************************************************/
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#include "mamedef.h"
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#include <memory.h>
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#include <stdlib.h>
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//#include "sndintrf.h"
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//#include "streams.h"
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#include "rf5c68.h"
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#include <math.h>
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#define NULL ((void *)0)
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#define NUM_CHANNELS (8)
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#define STEAM_STEP 0x800
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typedef struct _pcm_channel pcm_channel;
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struct _pcm_channel
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{
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UINT8 enable;
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UINT8 env;
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UINT8 pan;
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UINT8 start;
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UINT32 addr;
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UINT16 step;
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UINT16 loopst;
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UINT8 Muted;
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};
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typedef struct _mem_stream mem_stream;
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struct _mem_stream
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{
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UINT32 BaseAddr;
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UINT32 EndAddr;
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UINT32 CurAddr;
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UINT16 CurStep;
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const UINT8* MemPnt;
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};
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typedef struct _rf5c68_state rf5c68_state;
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struct _rf5c68_state
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{
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//sound_stream * stream;
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pcm_channel chan[NUM_CHANNELS];
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UINT8 cbank;
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UINT8 wbank;
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UINT8 enable;
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UINT32 datasize;
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UINT8* data;
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//void (*sample_callback)(running_device* device,int channel);
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mem_stream memstrm;
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};
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static void rf5c68_mem_stream_flush(rf5c68_state *chip);
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/*INLINE rf5c68_state *get_safe_token(const device_config *device)
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{
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assert(device != NULL);
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assert(device->token != NULL);
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assert(device->type == SOUND);
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assert(sound_get_type(device) == SOUND_RF5C68);
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return (rf5c68_state *)device->token;
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}*/
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/************************************************/
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/* RF5C68 stream update */
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/************************************************/
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static void memstream_sample_check(rf5c68_state *chip, UINT32 addr, UINT16 Speed)
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{
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mem_stream* ms = &chip->memstrm;
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UINT32 SmplSpd;
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SmplSpd = (Speed >= 0x0800) ? (Speed >> 11) : 1;
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if (addr >= ms->CurAddr)
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{
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// Is the stream too fast? (e.g. about to catch up the output)
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if (addr - ms->CurAddr <= SmplSpd * 5)
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{
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// Yes - delay the stream
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ms->CurAddr -= SmplSpd * 4;
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if (ms->CurAddr < ms->BaseAddr)
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ms->CurAddr = ms->BaseAddr;
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}
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}
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else
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{
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// Is the stream too slow? (e.g. the output is about to catch up the stream)
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if (ms->CurAddr - addr <= SmplSpd * 5)
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{
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if (ms->CurAddr + SmplSpd * 4 >= ms->EndAddr)
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{
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rf5c68_mem_stream_flush(chip);
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}
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else
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{
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memcpy(chip->data + ms->CurAddr, ms->MemPnt + (ms->CurAddr - ms->BaseAddr), SmplSpd * 4);
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ms->CurAddr += SmplSpd * 4;
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}
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}
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}
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return;
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}
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//static STREAM_UPDATE( rf5c68_update )
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void rf5c68_update(void *_info, stream_sample_t **outputs, int samples)
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{
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//rf5c68_state *chip = (rf5c68_state *)param;
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rf5c68_state *chip = (rf5c68_state *)_info;
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mem_stream* ms = &chip->memstrm;
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stream_sample_t *left = outputs[0];
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stream_sample_t *right = outputs[1];
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int i, j;
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/* start with clean buffers */
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memset(left, 0, samples * sizeof(*left));
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memset(right, 0, samples * sizeof(*right));
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/* bail if not enabled */
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if (!chip->enable)
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return;
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/* loop over channels */
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for (i = 0; i < NUM_CHANNELS; i++)
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{
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pcm_channel *chan = &chip->chan[i];
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/* if this channel is active, accumulate samples */
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if (chan->enable && ! chan->Muted)
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{
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int lv = (chan->pan & 0x0f) * chan->env;
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int rv = ((chan->pan >> 4) & 0x0f) * chan->env;
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/* loop over the sample buffer */
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for (j = 0; j < samples; j++)
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{
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int sample;
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/* trigger sample callback */
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/*if(chip->sample_callback)
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{
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if(((chan->addr >> 11) & 0xfff) == 0xfff)
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chip->sample_callback(chip->device,((chan->addr >> 11)/0x2000));
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}*/
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memstream_sample_check(chip, (chan->addr >> 11) & 0xFFFF, chan->step);
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/* fetch the sample and handle looping */
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sample = chip->data[(chan->addr >> 11) & 0xffff];
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if (sample == 0xff)
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{
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chan->addr = chan->loopst << 11;
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sample = chip->data[(chan->addr >> 11) & 0xffff];
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/* if we loop to a loop point, we're effectively dead */
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if (sample == 0xff)
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break;
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}
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chan->addr += chan->step;
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/* add to the buffer */
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if (sample & 0x80)
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{
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sample &= 0x7f;
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left[j] += (sample * lv) >> 5;
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right[j] += (sample * rv) >> 5;
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}
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else
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{
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left[j] -= (sample * lv) >> 5;
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right[j] -= (sample * rv) >> 5;
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}
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}
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}
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}
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if (samples && ms->CurAddr < ms->EndAddr)
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{
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ms->CurStep += STEAM_STEP * samples;
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if (ms->CurStep >= 0x0800) // 1 << 11
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{
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i = ms->CurStep >> 11;
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ms->CurStep &= 0x07FF;
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if (ms->CurAddr + i > ms->EndAddr)
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i = ms->EndAddr - ms->CurAddr;
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memcpy(chip->data + ms->CurAddr, ms->MemPnt + (ms->CurAddr - ms->BaseAddr), i);
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ms->CurAddr += i;
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}
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}
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// I think, this is completely useless
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/* now clamp and shift the result (output is only 10 bits) */
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/*for (j = 0; j < samples; j++)
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{
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stream_sample_t temp;
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temp = left[j];
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if (temp > 32767) temp = 32767;
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else if (temp < -32768) temp = -32768;
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left[j] = temp & ~0x3f;
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temp = right[j];
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if (temp > 32767) temp = 32767;
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else if (temp < -32768) temp = -32768;
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right[j] = temp & ~0x3f;
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}*/
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}
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/************************************************/
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/* RF5C68 start */
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/************************************************/
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//static DEVICE_START( rf5c68 )
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int device_start_rf5c68(void **_info, int clock)
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{
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//const rf5c68_interface* intf = (const rf5c68_interface*)device->baseconfig().static_config();
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/* allocate memory for the chip */
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//rf5c68_state *chip = get_safe_token(device);
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rf5c68_state *chip;
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int chn;
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chip = (rf5c68_state *) calloc(1, sizeof(rf5c68_state));
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*_info = (void *) chip;
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chip->datasize = 0x10000;
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chip->data = (UINT8*)malloc(chip->datasize);
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/* allocate the stream */
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//chip->stream = stream_create(device, 0, 2, device->clock / 384, chip, rf5c68_update);
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/* set up callback */
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/*if(intf != NULL)
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chip->sample_callback = intf->sample_end_callback;
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else
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chip->sample_callback = NULL;*/
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for (chn = 0; chn < NUM_CHANNELS; chn ++)
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chip->chan[chn].Muted = 0x00;
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return (clock & 0x7FFFFFFF) / 384;
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}
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void device_stop_rf5c68(void *_info)
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{
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rf5c68_state *chip = (rf5c68_state *)_info;
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free(chip->data); chip->data = NULL;
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free(chip);
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return;
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}
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void device_reset_rf5c68(void *_info)
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{
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rf5c68_state *chip = (rf5c68_state *)_info;
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int i;
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pcm_channel* chan;
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mem_stream* ms = &chip->memstrm;
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// Clear the PCM memory.
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memset(chip->data, 0x00, chip->datasize);
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chip->enable = 0;
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chip->cbank = 0;
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chip->wbank = 0;
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/* clear channel registers */
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for (i = 0; i < NUM_CHANNELS; i ++)
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{
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chan = &chip->chan[i];
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chan->enable = 0;
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chan->env = 0;
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chan->pan = 0;
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chan->start = 0;
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chan->addr = 0;
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chan->step = 0;
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chan->loopst = 0;
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}
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ms->BaseAddr = 0x0000;
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ms->CurAddr = 0x0000;
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ms->EndAddr = 0x0000;
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ms->CurStep = 0x0000;
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ms->MemPnt = NULL;
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}
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/************************************************/
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/* RF5C68 write register */
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/************************************************/
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//WRITE8_DEVICE_HANDLER( rf5c68_w )
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void rf5c68_w(void *_info, offs_t offset, UINT8 data)
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{
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//rf5c68_state *chip = get_safe_token(device);
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rf5c68_state *chip = (rf5c68_state *)_info;
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pcm_channel *chan = &chip->chan[chip->cbank];
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int i;
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/* force the stream to update first */
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//stream_update(chip->stream);
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/* switch off the address */
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switch (offset)
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{
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case 0x00: /* envelope */
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chan->env = data;
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break;
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case 0x01: /* pan */
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chan->pan = data;
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break;
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case 0x02: /* FDL */
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chan->step = (chan->step & 0xff00) | (data & 0x00ff);
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break;
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case 0x03: /* FDH */
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chan->step = (chan->step & 0x00ff) | ((data << 8) & 0xff00);
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break;
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case 0x04: /* LSL */
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chan->loopst = (chan->loopst & 0xff00) | (data & 0x00ff);
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break;
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case 0x05: /* LSH */
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chan->loopst = (chan->loopst & 0x00ff) | ((data << 8) & 0xff00);
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break;
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case 0x06: /* ST */
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chan->start = data;
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if (!chan->enable)
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chan->addr = chan->start << (8 + 11);
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break;
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case 0x07: /* control reg */
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chip->enable = (data >> 7) & 1;
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if (data & 0x40)
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chip->cbank = data & 7;
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else
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chip->wbank = data & 15;
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break;
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case 0x08: /* channel on/off reg */
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for (i = 0; i < 8; i++)
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{
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chip->chan[i].enable = (~data >> i) & 1;
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if (!chip->chan[i].enable)
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chip->chan[i].addr = chip->chan[i].start << (8 + 11);
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}
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break;
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}
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}
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/************************************************/
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/* RF5C68 read memory */
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/************************************************/
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//READ8_DEVICE_HANDLER( rf5c68_mem_r )
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UINT8 rf5c68_mem_r(void *_info, offs_t offset)
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{
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//rf5c68_state *chip = get_safe_token(device);
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rf5c68_state *chip = (rf5c68_state *)_info;
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return chip->data[chip->wbank * 0x1000 + offset];
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}
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/************************************************/
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/* RF5C68 write memory */
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/************************************************/
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//WRITE8_DEVICE_HANDLER( rf5c68_mem_w )
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void rf5c68_mem_w(void *_info, offs_t offset, UINT8 data)
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{
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//rf5c68_state *chip = get_safe_token(device);
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rf5c68_state *chip = (rf5c68_state *)_info;
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rf5c68_mem_stream_flush(chip);
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chip->data[chip->wbank * 0x1000 | offset] = data;
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}
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static void rf5c68_mem_stream_flush(rf5c68_state *chip)
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{
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mem_stream* ms = &chip->memstrm;
|
||
|
|
|
||
|
|
if (ms->CurAddr >= ms->EndAddr)
|
||
|
|
return;
|
||
|
|
|
||
|
|
memcpy(chip->data + ms->CurAddr, ms->MemPnt + (ms->CurAddr - ms->BaseAddr), ms->EndAddr - ms->CurAddr);
|
||
|
|
ms->CurAddr = ms->EndAddr;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
void rf5c68_write_ram(void *_info, offs_t DataStart, offs_t DataLength, const UINT8* RAMData)
|
||
|
|
{
|
||
|
|
rf5c68_state *chip = (rf5c68_state *)_info;
|
||
|
|
mem_stream* ms = &chip->memstrm;
|
||
|
|
UINT16 BytCnt;
|
||
|
|
|
||
|
|
DataStart |= chip->wbank * 0x1000;
|
||
|
|
if (DataStart >= chip->datasize)
|
||
|
|
return;
|
||
|
|
if (DataStart + DataLength > chip->datasize)
|
||
|
|
DataLength = chip->datasize - DataStart;
|
||
|
|
|
||
|
|
//memcpy(chip->data + DataStart, RAMData, DataLength);
|
||
|
|
|
||
|
|
rf5c68_mem_stream_flush(chip);
|
||
|
|
|
||
|
|
ms->BaseAddr = DataStart;
|
||
|
|
ms->CurAddr = ms->BaseAddr;
|
||
|
|
ms->EndAddr = ms->BaseAddr + DataLength;
|
||
|
|
ms->CurStep = 0x0000;
|
||
|
|
ms->MemPnt = RAMData;
|
||
|
|
|
||
|
|
//BytCnt = (STEAM_STEP * 32) >> 11;
|
||
|
|
BytCnt = 0x40; // SegaSonic Arcade: Run! Run! Run! needs such a high value
|
||
|
|
if (ms->CurAddr + BytCnt > ms->EndAddr)
|
||
|
|
BytCnt = ms->EndAddr - ms->CurAddr;
|
||
|
|
|
||
|
|
memcpy(chip->data + ms->CurAddr, ms->MemPnt + (ms->CurAddr - ms->BaseAddr), BytCnt);
|
||
|
|
ms->CurAddr += BytCnt;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void rf5c68_set_mute_mask(void *_info, UINT32 MuteMask)
|
||
|
|
{
|
||
|
|
rf5c68_state *chip = (rf5c68_state *)_info;
|
||
|
|
unsigned char CurChn;
|
||
|
|
|
||
|
|
for (CurChn = 0; CurChn < NUM_CHANNELS; CurChn ++)
|
||
|
|
chip->chan[CurChn].Muted = (MuteMask >> CurChn) & 0x01;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
* Generic get_info
|
||
|
|
**************************************************************************/
|
||
|
|
|
||
|
|
/*DEVICE_GET_INFO( rf5c68 )
|
||
|
|
{
|
||
|
|
switch (state)
|
||
|
|
{
|
||
|
|
// --- the following bits of info are returned as 64-bit signed integers ---
|
||
|
|
case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(rf5c68_state); break;
|
||
|
|
|
||
|
|
// --- the following bits of info are returned as pointers to data or functions ---
|
||
|
|
case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( rf5c68 ); break;
|
||
|
|
case DEVINFO_FCT_STOP: // Nothing break;
|
||
|
|
case DEVINFO_FCT_RESET: // Nothing break;
|
||
|
|
|
||
|
|
// --- the following bits of info are returned as NULL-terminated strings ---
|
||
|
|
case DEVINFO_STR_NAME: strcpy(info->s, "RF5C68"); break;
|
||
|
|
case DEVINFO_STR_FAMILY: strcpy(info->s, "Ricoh PCM"); break;
|
||
|
|
case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
|
||
|
|
case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
|
||
|
|
case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break;
|
||
|
|
}
|
||
|
|
}*/
|
||
|
|
|
||
|
|
/**************** end of file ****************/
|