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minor code cleanup

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ekeeke31 2010-08-10 19:54:35 +00:00
parent 70d297a327
commit b09509edb8
1 changed files with 10 additions and 9 deletions
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19
source/sound/sound.c
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@ -124,7 +124,7 @@ void sound_init(void)
/* For better accuracy, sound chips run in synchronization with 68k and Z80 cpus */ /* For better accuracy, sound chips run in synchronization with 68k and Z80 cpus */
/* These values give the exact number of M-cycles between 2 rendered samples. */ /* These values give the exact number of M-cycles between 2 rendered samples. */
/* we use 21.11 fixed point precision (max. mcycle value is 3420*313 i.e 21 bits max) */ /* we use 21.11 fixed point precision (max. mcycle value is 3420*313 i.e 21 bits max) */
psg_cycles_ratio = (int)((mclk / (double) snd.sample_rate) * 2048.0); psg_cycles_ratio = (unsigned int)(mclk / (double) snd.sample_rate * 2048.0);
fm_cycles_ratio = psg_cycles_ratio; fm_cycles_ratio = psg_cycles_ratio;
fm_cycles_count = 0; fm_cycles_count = 0;
psg_cycles_count = 0; psg_cycles_count = 0;
@ -178,20 +178,21 @@ int sound_update(unsigned int cycles)
int avail = Fir_Resampler_avail(); int avail = Fir_Resampler_avail();
/* resynchronize FM & PSG chips */ /* resynchronize FM & PSG chips */
if (avail > size) if (avail < size)
{ {
/* FM chip is ahead */ /* FM chip is late for one (or two) samples */
fm_cycles_count += (avail - size) * psg_cycles_ratio; do
}
else
{ {
while (avail < size)
{
/* FM chip is late for one sample */
YM2612Update(Fir_Resampler_buffer(), 1); YM2612Update(Fir_Resampler_buffer(), 1);
Fir_Resampler_write(2); Fir_Resampler_write(2);
avail = Fir_Resampler_avail(); avail = Fir_Resampler_avail();
} }
while (avail < size);
}
else
{
/* FM chip is ahead */
fm_cycles_count += (avail - size) * psg_cycles_ratio;
} }
} }