/* update_audio() emulates actions of audio state machine since it was last
time called. One can assume it is called at least once per horizontal
line and possibly more often. */
void update_audio (void)
{
/* Number of cycles that has passed since last call to update_audio() */
unsigned long n_cycles = cycles - last_audio_cycles;
while (n_cycles > 0) {
unsigned long best_evtime = n_cycles + 1;
int i;
unsigned long rounded;
float f;
for (i = 0; i < 4; i++) {
if (audio_channel[i].state != 0 && best_evtime > audio_channel[i].evtime)
best_evtime = audio_channel[i].evtime;
}
/* next_sample_evtime >= 0 so floor() behaves as expected */
rounded = floorf(next_sample_evtime);
if ((next_sample_evtime - rounded) >= 0.5)
rounded++;
if (best_evtime > rounded)
best_evtime = rounded;
if (best_evtime > n_cycles)
best_evtime = n_cycles;
/* Decrease time-to-wait counters */
next_sample_evtime -= best_evtime;
/* sample_prehandler makes it possible to compute effects with
accuracy of one bus cycle. sample_handler is only called when
a sample is outputted. */
if (sample_prehandler != NULL)
sample_prehandler(best_evtime);
for (i = 0; i < 4; i++)
audio_channel[i].evtime -= best_evtime;
n_cycles -= best_evtime;
/* Test if new sample needs to be outputted */
if (rounded == best_evtime) {
/* Before the following addition, next_sample_evtime is in range
[-0.5, 0.5) */
next_sample_evtime += sample_evtime_interval;
(*sample_handler) ();
}
/* Call audio state machines if needed */
for (i = 0; i < 4; i++) {
if (audio_channel[i].evtime == 0 && audio_channel[i].state != 0)
audio_handler(i);
}
}
last_audio_cycles = cycles - n_cycles;
}
void update_audio (void)
{
unsigned long int n_cycles;
uae4all_prof_start(4);
n_cycles = get_cycles () - last_cycles;
for (;;) {
#ifdef __arm__
asm(".align 4");
#endif
register unsigned long int best_evtime = n_cycles + 1;
//int addr = (int)audio_channel_evtime;
//AUDIO_PREFETCH(addr);
// CHECK_STATE
if (best_evtime > audio_channel_evtime[0])
best_evtime = audio_channel_evtime[0];
if (best_evtime > audio_channel_evtime[1])
best_evtime = audio_channel_evtime[1];
if (best_evtime > audio_channel_evtime[2])
best_evtime = audio_channel_evtime[2];
if (best_evtime > audio_channel_evtime[3])
best_evtime = audio_channel_evtime[3];
if (best_evtime > next_sample_evtime)
best_evtime = next_sample_evtime;
if (best_evtime > n_cycles)
break;
// SUB_EVTIME
next_sample_evtime -= best_evtime;
audio_channel_evtime[0] -= best_evtime;
audio_channel_evtime[1] -= best_evtime;
audio_channel_evtime[2] -= best_evtime;
audio_channel_evtime[3] -= best_evtime;
n_cycles -= best_evtime;
/*
addr = (int)&audio_channel_current_sample;
AUDIO_PREFETCH(addr);
addr = (int)&audio_channel_vol;
AUDIO_PREFETCH(addr);
addr = (int)&audio_channel_adk_mask;
AUDIO_PREFETCH(addr);
*/
// IF_SAMPLE
if (!next_sample_evtime) {
next_sample_evtime = scaled_sample_evtime;
register uae_u32 d0 = audio_channel_current_sample[0];
register uae_u32 d1 = audio_channel_current_sample[1];
register uae_u32 d2 = audio_channel_current_sample[2];
register uae_u32 d3 = audio_channel_current_sample[3];
d0 *= audio_channel_vol[0];
d1 *= audio_channel_vol[1];
d2 *= audio_channel_vol[2];
d3 *= audio_channel_vol[3];
d0 &= audio_channel_adk_mask[0];
d1 &= audio_channel_adk_mask[1];
d2 &= audio_channel_adk_mask[2];
d3 &= audio_channel_adk_mask[3];
*(uae_u16 *)sndbufpt = d0+d1+d2+d3;
sndbufpt = (uae_u16 *)(((uae_u8 *)sndbufpt) + 2);
if ((unsigned)sndbufpt - (unsigned)render_sndbuff >= SNDBUFFER_LEN) {
finish_sound_buffer ();
}
}
// RUN_HANDLERS
for (int i=0; i < 4; i++) {
if (!audio_channel_evtime[i])
audio_handler(i);
}
/*
if (!audio_channel_evtime[0])
audio_handler_0();
if (!audio_channel_evtime[1])
audio_handler_1();
if (!audio_channel_evtime[2])
audio_handler_2();
if (!audio_channel_evtime[3])
audio_handler_3();
*/
}
last_cycles = get_cycles () - n_cycles;
uae4all_prof_end(4);
}