void audio_init(int rate)
{
/* Clear sound context */
memset(&snd, 0, sizeof(t_snd));
/* Reset logging data */
snd.log = 0;
snd.callback = NULL;
/* Oops.. sound is disabled */
if(!rate) return;
/* Calculate buffer size in samples */
snd.bufsize = 2048;
/* Sound output */
#ifdef _3DS
snd.buffer[0] = (signed short int *)linearAlloc(snd.bufsize * 2);
snd.buffer[1] = (signed short int *)linearAlloc(snd.bufsize * 2);
#else
snd.buffer[0] = (signed short int *)malloc(snd.bufsize * 2);
snd.buffer[1] = (signed short int *)malloc(snd.bufsize * 2);
#endif
if(!snd.buffer[0] || !snd.buffer[1]) return;
memset(snd.buffer[0], 0, snd.bufsize * 2);
memset(snd.buffer[1], 0, snd.bufsize * 2);
/* YM2413 sound stream */
snd.fm_buffer = (signed short int *)malloc(snd.bufsize * 2);
if(!snd.fm_buffer) return;
memset(snd.fm_buffer, 0, snd.bufsize * 2);
/* SN76489 sound stream */
snd.psg_buffer[0] = (signed short int *)malloc(snd.bufsize * 2);
snd.psg_buffer[1] = (signed short int *)malloc(snd.bufsize * 2);
if(!snd.psg_buffer[0] || !snd.psg_buffer[1]) return;
memset(snd.psg_buffer[0], 0, snd.bufsize * 2);
memset(snd.psg_buffer[1], 0, snd.bufsize * 2);
/* Set up SN76489 emulation */
SN76496_init(0, MASTER_CLOCK, 255, rate);
/* Set up YM2413 emulation */
OPLL_init(3579545, rate) ;
opll = OPLL_new() ;
OPLL_reset(opll) ;
OPLL_reset_patch(opll,0) ; /* if use default voice data. */
/* Inform other functions that we can use sound */
snd.enabled = 1;
}
void FM_Init(void)
{
switch(snd.fm_which)
{
case SND_EMU2413:
OPLL_init(snd.fm_clock, snd.sample_rate);
opll = OPLL_new();
OPLL_reset(opll);
OPLL_reset_patch(opll, 0);
break;
case SND_YM2413:
YM2413Init(1, snd.fm_clock, snd.sample_rate);
YM2413ResetChip(0);
break;
}
}