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Added PS/1 Audio Card emulation.

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This commit is contained in:
SarahW 2016-04-13 21:56:15 +01:00
commit 61d7cf2276
13 changed files with 239 additions and 15 deletions
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13
src/sound_sn76489.c
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@ -15,7 +15,7 @@ static float volslog[16]=
7.51785f,9.46440f,11.9194f,15.0000f
};
#define PSGCONST ((3579545.0 / 64.0) / 48000.0)
//#define PSGCONST ((3579545.0 / 64.0) / 48000.0)
void sn76489_update(sn76489_t *sn76489)
{
@ -29,7 +29,7 @@ void sn76489_update(sn76489_t *sn76489)
if (sn76489->latch[c] > 256) result += (int16_t) (volslog[sn76489->vol[c]] * sn76489->stat[c]);
else result += (int16_t) (volslog[sn76489->vol[c]] * 127);
sn76489->count[c] -= (256 * PSGCONST);
sn76489->count[c] -= (256 * sn76489->psgconst);
while ((int)sn76489->count[c] < 0)
{
sn76489->count[c] += sn76489->latch[c];
@ -38,7 +38,7 @@ void sn76489_update(sn76489_t *sn76489)
}
result += (((sn76489->shift & 1) ^ 1) * 127 * volslog[sn76489->vol[0]] * 2);
sn76489->count[0] -= (512 * PSGCONST);
sn76489->count[0] -= (512 * sn76489->psgconst);
while ((int)sn76489->count[0] < 0 && sn76489->latch[0])
{
sn76489->count[0] += (sn76489->latch[0] * 4);
@ -177,7 +177,7 @@ void sn74689_set_extra_divide(sn76489_t *sn76489, int enable)
sn76489->extra_divide = enable;
}
void sn76489_init(sn76489_t *sn76489, uint16_t base, uint16_t size, int type)
void sn76489_init(sn76489_t *sn76489, uint16_t base, uint16_t size, int type, int freq)
{
sound_add_handler(sn76489_get_buffer, sn76489);
@ -193,6 +193,7 @@ void sn76489_init(sn76489_t *sn76489, uint16_t base, uint16_t size, int type)
sn76489->noise = 3;
sn76489->shift = 0x4000;
sn76489->type = type;
sn76489->psgconst = (((double)freq / 64.0) / 48000.0);
sn76489_mute = 0;
@ -204,7 +205,7 @@ void *sn76489_device_init()
sn76489_t *sn76489 = malloc(sizeof(sn76489_t));
memset(sn76489, 0, sizeof(sn76489_t));
sn76489_init(sn76489, 0x00c0, 0x0008, SN76496);
sn76489_init(sn76489, 0x00c0, 0x0008, SN76496, 3579545);
return sn76489;
}
@ -213,7 +214,7 @@ void *ncr8496_device_init()
sn76489_t *sn76489 = malloc(sizeof(sn76489_t));
memset(sn76489, 0, sizeof(sn76489_t));
sn76489_init(sn76489, 0x00c0, 0x0008, NCR8496);
sn76489_init(sn76489, 0x00c0, 0x0008, NCR8496, 3579545);
return sn76489;
}