134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
|
|
#include "cpu.h"
|
|
#include <86box/86box.h>
|
|
#include <86box/filters.h>
|
|
#include <86box/timer.h>
|
|
#include <86box/lpt.h>
|
|
#include <86box/machine.h>
|
|
#include <86box/sound.h>
|
|
#include <86box/plat_unused.h>
|
|
|
|
typedef struct lpt_dac_t {
|
|
void *lpt;
|
|
|
|
uint8_t dac_val_l;
|
|
uint8_t dac_val_r;
|
|
|
|
int is_stereo;
|
|
int channel;
|
|
|
|
int16_t buffer[2][SOUNDBUFLEN];
|
|
int pos;
|
|
} lpt_dac_t;
|
|
|
|
static void
|
|
dac_update(lpt_dac_t *lpt_dac)
|
|
{
|
|
for (; lpt_dac->pos < sound_pos_global; lpt_dac->pos++) {
|
|
lpt_dac->buffer[0][lpt_dac->pos] = (int8_t) (lpt_dac->dac_val_l ^ 0x80) * 0x40;
|
|
lpt_dac->buffer[1][lpt_dac->pos] = (int8_t) (lpt_dac->dac_val_r ^ 0x80) * 0x40;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dac_write_data(uint8_t val, void *priv)
|
|
{
|
|
lpt_dac_t *lpt_dac = (lpt_dac_t *) priv;
|
|
|
|
if (lpt_dac->is_stereo) {
|
|
if (lpt_dac->channel)
|
|
lpt_dac->dac_val_r = val;
|
|
else
|
|
lpt_dac->dac_val_l = val;
|
|
} else
|
|
lpt_dac->dac_val_l = lpt_dac->dac_val_r = val;
|
|
dac_update(lpt_dac);
|
|
}
|
|
|
|
static void
|
|
dac_write_ctrl(uint8_t val, void *priv)
|
|
{
|
|
lpt_dac_t *lpt_dac = (lpt_dac_t *) priv;
|
|
|
|
if (lpt_dac->is_stereo)
|
|
lpt_dac->channel = val & 0x01;
|
|
}
|
|
|
|
static uint8_t
|
|
dac_read_status(UNUSED(void *priv))
|
|
{
|
|
return 0x0f;
|
|
}
|
|
|
|
static void
|
|
dac_get_buffer(int32_t *buffer, int len, void *priv)
|
|
{
|
|
lpt_dac_t *lpt_dac = (lpt_dac_t *) priv;
|
|
|
|
dac_update(lpt_dac);
|
|
|
|
for (int c = 0; c < len; c++) {
|
|
buffer[c * 2] += dac_iir(0, lpt_dac->buffer[0][c]);
|
|
buffer[c * 2 + 1] += dac_iir(1, lpt_dac->buffer[1][c]);
|
|
}
|
|
lpt_dac->pos = 0;
|
|
}
|
|
|
|
static void *
|
|
dac_init(void *lpt)
|
|
{
|
|
lpt_dac_t *lpt_dac = calloc(1, sizeof(lpt_dac_t));
|
|
|
|
lpt_dac->lpt = lpt;
|
|
|
|
sound_add_handler(dac_get_buffer, lpt_dac);
|
|
|
|
return lpt_dac;
|
|
}
|
|
|
|
static void *
|
|
dac_stereo_init(void *lpt)
|
|
{
|
|
lpt_dac_t *lpt_dac = dac_init(lpt);
|
|
|
|
lpt_dac->is_stereo = 1;
|
|
|
|
return lpt_dac;
|
|
}
|
|
static void
|
|
dac_close(void *priv)
|
|
{
|
|
lpt_dac_t *lpt_dac = (lpt_dac_t *) priv;
|
|
|
|
free(lpt_dac);
|
|
}
|
|
|
|
const lpt_device_t lpt_dac_device = {
|
|
.name = "LPT DAC / Covox Speech Thing",
|
|
.internal_name = "lpt_dac",
|
|
.init = dac_init,
|
|
.close = dac_close,
|
|
.write_data = dac_write_data,
|
|
.write_ctrl = dac_write_ctrl,
|
|
.read_data = NULL,
|
|
.read_status = dac_read_status,
|
|
.read_ctrl = NULL
|
|
};
|
|
|
|
const lpt_device_t lpt_dac_stereo_device = {
|
|
.name = "Stereo LPT DAC",
|
|
.internal_name = "lpt_dac_stereo",
|
|
.init = dac_stereo_init,
|
|
.close = dac_close,
|
|
.write_data = dac_write_data,
|
|
.write_ctrl = dac_write_ctrl,
|
|
.read_data = NULL,
|
|
.read_status = dac_read_status,
|
|
.read_ctrl = NULL
|
|
};
|