{
const int *src = ChanBuf + start;
unsigned short *dst = &spuMem[0x800/2 + which*0x400/2];
- int cursor = decode_pos;
+ int cursor = decode_pos + start;
while (count-- > 0)
{
+ cursor &= 0x1ff;
dst[cursor] = *src++;
- cursor = (cursor + 1) & 0x1ff;
+ cursor++;
}
// decode_pos is updated and irqs are checked later, after voice loop
while(!bIRQReturn)
{
- cycles_since_update = 0;
-
ns_from=0;
ns_to=NSSIZE;
ch=0;
ns++;
}
+ cycles_since_update -= PSXCLK / 44100 * NSSIZE;
+
//////////////////////////////////////////////////////
// special irq handling in the decode buffers (0x0000-0x1000)
// we know:
if(forced_updates == 0 && out_current->busy())
break;
}
+
+ if(cycles_since_update <= -PSXCLK/60 / 4)
+ break;
}
+ // this may cause desync, but help audio when the emu can't keep up..
+ if(cycles_since_update < 0)
+ cycles_since_update = 0;
+
return 0;
}
void CALLBACK SPUasync(unsigned long cycle)
{
- static int old_ctrl;
int forced_updates = 0;
int do_update = 0;
had_dma = 0;
}
- if((spuCtrl&CTRL_IRQ) && (((spuCtrl^old_ctrl)&CTRL_IRQ) // irq was enabled
- || cycles_since_update > PSXCLK/60 / 4)) {
+ if(cycles_since_update > PSXCLK/60 * 5/4)
do_update = 1;
- forced_updates = cycles_since_update / (PSXCLK/44100) / NSSIZE;
- }
- // with no irqs, once per frame should be fine (using a bit more because of BIAS)
- else if(cycles_since_update > PSXCLK/60 * 5/4)
- do_update = 1;
-
- old_ctrl = spuCtrl;
if(do_update)
do_samples(forced_updates);