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Sensation audio: Implement the mixer

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win2kgamer
2026-01-27 22:14:42 -06:00
parent 47b132f6fe
commit 4389231cc0
1 changed files with 123 additions and 20 deletions
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143
src/sound/snd_sensation.c
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@@ -64,6 +64,8 @@ sensation_log(void *priv, const char *fmt, ...)
# define sensation_log(fmt, ...)
#endif
static int visdac_vols_6bits[64];
typedef struct sensation_t {
int mma_irq;
int mma_dma;
@@ -148,12 +150,30 @@ typedef struct sensation_t {
int visdac_count;
double cd_vol_l;
double cd_vol_r;
int fm_vol_l;
int fm_vol_r;
int wave_vol_l;
int wave_vol_r;
void * log; /* New logging system */
} sensation_t;
void sensation_mma_timer_poll(void *priv);
void sensation_mma_update(sensation_t *dev);
void
sensation_filter_cd_audio(int channel, double *buffer, void *priv)
{
sensation_t *dev = (sensation_t *) priv;
const double cd_vol = channel ? dev->cd_vol_r : dev->cd_vol_l;
double c = ((*buffer * cd_vol / 4.0)) / 65536.0;
*buffer = c;
}
void
sensation_visdac_update(sensation_t *dev)
{
@@ -286,6 +306,14 @@ sensation_visdac_poll(void *priv)
default:
break;
}
if (dev->wave_vol_l == 0)
dev->visdac_out_l = 0;
else
dev->visdac_out_l = (int16_t) ((dev->visdac_out_l * dev->wave_vol_l) >> 16);
if (dev->wave_vol_r == 0)
dev->visdac_out_r = 0;
else
dev->visdac_out_r = (int16_t) ((dev->visdac_out_r * dev->wave_vol_r) >> 16);
//if (!(dev->visdac_playback_pos & 0x03))
// dev->visdac_count--;
if (dev->visdac_count < 0) {
@@ -389,21 +417,6 @@ sensation_visdac_write(uint16_t port, uint8_t val, void *priv)
sensation_log(visdac->log, "[%04X:%08X] Sensation VISDAC Write: port = %02X, val = %02X\n", CS, cpu_state.pc, port, val);
/* TODO: Implement volume controls:
* 222/223 reg 0 = CD L Mute
* 222/223 reg 1 = CD R Mute
* 222/223 reg 2 = MIDI L Mute
* 222/223 reg 3 = MIDI R Mute
* 222/223 reg 4 = CD L Volume
* 222/223 reg 5 = CD R Volume
* 222/223 reg 6 = MIDI L Volume
* 222/223 reg 7 = MIDI R Volume
* 224/225 reg 0 = Wave L Mute
* 224/225 reg 1 = Wave R Mute
* 224/225 reg 4 = Wave L Volume
* 224/225 reg 5 = Wave R Volume
*/
uint8_t oldmode = visdac->visdac_mode;
switch (port & 0xF) {
case 0x00: /* Mode/Enable register */
@@ -429,6 +442,46 @@ sensation_visdac_write(uint16_t port, uint8_t val, void *priv)
case 0x02: /* Indirect register set 0 data */
visdac->visdac_regs[0x02] = val;
visdac->visdac_iregs0[visdac->visdac_regs[0x03] & 0x0f] = val;
switch (visdac->visdac_regs[0x03]) {
case 0: /* CD L Mute */
visdac->cd_vol_l = 0;
break;
case 1: /* CD R Mute */
visdac->cd_vol_r = 0;
break;
case 2: /* MIDI L Mute */
visdac->fm_vol_l = 0;
break;
case 3: /* MIDI R Mute */
visdac->fm_vol_r = 0;
break;
case 4: /* CD L Volume */
if (visdac->visdac_iregs0[0x04] == 0x00)
visdac->cd_vol_l = 0;
else
visdac->cd_vol_l = visdac_vols_6bits[(visdac->visdac_iregs0[0x04] & 0x3f)];
break;
case 5: /* CD R Volume */
if (visdac->visdac_iregs0[0x05] == 0x00)
visdac->cd_vol_r = 0;
else
visdac->cd_vol_r = visdac_vols_6bits[(visdac->visdac_iregs0[0x05] & 0x3f)];
break;
case 6: /* MIDI L Volume */
if (visdac->visdac_iregs0[0x06] == 0x00)
visdac->fm_vol_l = 0;
else
visdac->fm_vol_l = visdac_vols_6bits[(visdac->visdac_iregs0[0x06] & 0x3f)];
break;
case 7: /* MIDI R Volume */
if (visdac->visdac_iregs0[0x07] == 0x00)
visdac->fm_vol_r = 0;
else
visdac->fm_vol_r = visdac_vols_6bits[(visdac->visdac_iregs0[0x07] & 0x3f)];
break;
default:
break;
}
break;
case 0x03: /* Indirect register set 0 index */
visdac->visdac_regs[0x03] = val;
@@ -436,6 +489,30 @@ sensation_visdac_write(uint16_t port, uint8_t val, void *priv)
case 0x04: /* Indirect register set 1 data */
visdac->visdac_regs[0x04] = val;
visdac->visdac_iregs1[visdac->visdac_regs[0x05] & 0x0f] = val;
switch (visdac->visdac_regs[0x05]) {
case 0: /* Wave L Mute */
visdac->wave_vol_l = 0;
break;
case 1: /* Wave R Mute */
visdac->wave_vol_r = 0;
break;
case 2: /* Mic/Line/Phone L Mute */
break;
case 3: /* Mic/Line/Phone R Mute */
break;
case 4: /* Wave L Volume */
visdac->wave_vol_l = visdac_vols_6bits[(visdac->visdac_iregs1[0x04] & 0x3f)];
break;
case 5: /* Wave R Volume */
visdac->wave_vol_r = visdac_vols_6bits[(visdac->visdac_iregs1[0x05] & 0x3f)];
break;
case 6: /* Mic/Line/Phone L Volume */
break;
case 7: /* Mic/Line/Phone R Volume */
break;
default:
break;
}
break;
case 0x05: /* Indirect register set 1 index */
visdac->visdac_regs[0x05] = val;
@@ -443,10 +520,10 @@ sensation_visdac_write(uint16_t port, uint8_t val, void *priv)
case 0x06:
visdac->visdac_regs[0x06] = val;
break;
case 0x07:
case 0x07: /* Mixer Source Select */
visdac->visdac_regs[0x07] = val;
break;
case 0x08:
case 0x08: /* Mixer Crossover Control */
visdac->visdac_regs[0x08] = val;
break;
case 0x09: /* Control register */
@@ -1008,11 +1085,10 @@ sensation_get_buffer(int32_t *buffer, int len, void *priv)
sensation_mma_update(dev);
sensation_visdac_update(dev);
/* TODO: Volume controls */
for (c = 0; c < len * 2; c += 2) {
mma_buffer[c] = opl_buf[c];
mma_buffer[c] = (opl_buf[c] * dev->fm_vol_l) / 65536.0;
mma_buffer[c] += dev->mma_buffer[0][c >> 1];
mma_buffer[c + 1] = opl_buf[c + 1];
mma_buffer[c + 1] = (opl_buf[c + 1] * dev->fm_vol_r) / 65536.0;
mma_buffer[c + 1] += dev->mma_buffer[1][c >> 1];
buffer[c] += mma_buffer[c];
@@ -1103,6 +1179,33 @@ sensation_init(const device_t *info)
if (device_get_config_int("receive_input"))
midi_in_handler(1, sensation_input_msg, sensation_input_sysex, dev);
/* Calculate attenuation values for the 6-bit volume control */
int c;
double attenuation;
for (c = 0; c < 64; c++) {
attenuation = -31.5;
if (c & 0x01)
attenuation += 0.5;
if (c & 0x02)
attenuation += 1.0;
if (c & 0x04)
attenuation += 2.0;
if (c & 0x08)
attenuation += 4.0;
if (c & 0x10)
attenuation += 8.0;
if (c & 0x20)
attenuation += 16.0;
attenuation = pow(10, attenuation / 10);
visdac_vols_6bits[c] = (int) (attenuation * 65536);
}
/* Set up audio filters */
sound_set_cd_audio_filter(NULL, NULL);
sound_set_cd_audio_filter(sensation_filter_cd_audio, dev);
return dev;
}