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VIA AC97: Move some variables to SGD structure to ease future expansion

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This commit is contained in:
RichardG867
2021-11-12 20:33:43 -03:00
parent c4bb7e79a7
commit a649314798
1 changed files with 48 additions and 54 deletions
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102
src/sound/snd_ac97_via.c
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@@ -39,7 +39,12 @@ typedef struct {
int32_t sample_count;
uint8_t entry_flags, fifo[32], restart;
pc_timer_t timer;
int16_t out_l, out_r;
int vol_l, vol_r, pos;
int32_t buffer[SOUNDBUFLEN * 2];
uint64_t timer_latch;
pc_timer_t dma_timer, poll_timer;
} ac97_via_sgd_t;
typedef struct _ac97_via_ {
@@ -56,12 +61,7 @@ typedef struct _ac97_via_ {
ac97_codec_t *codec[2][2];
ac97_via_sgd_t sgd[6];
pc_timer_t timer_count, timer_count_fm;
uint64_t timer_latch, timer_latch_fm;
int16_t out_l, out_r, fm_out_l, fm_out_r;
int master_vol_l, master_vol_r, pcm_vol_l, pcm_vol_r, cd_vol_l, cd_vol_r;
int32_t buffer[SOUNDBUFLEN * 2], fm_buffer[SOUNDBUFLEN * 2];
int pos, fm_pos;
int master_vol_l, master_vol_r, cd_vol_l, cd_vol_r;
} ac97_via_t;
@@ -142,13 +142,13 @@ ac97_via_write_control(void *priv, uint8_t modem, uint8_t val)
/* Start or stop PCM playback. */
i = (val & 0xf4) == 0xc4;
if (i && !dev->pcm_enabled)
timer_advance_u64(&dev->timer_count, dev->timer_latch);
timer_advance_u64(&dev->sgd[0].poll_timer, dev->sgd[0].timer_latch);
dev->pcm_enabled = i;
/* Start or stop FM playback. */
i = (val & 0xf2) == 0xc2;
if (i && !dev->fm_enabled)
timer_advance_u64(&dev->timer_count_fm, dev->timer_latch);
timer_advance_u64(&dev->sgd[2].poll_timer, dev->sgd[2].timer_latch);
dev->fm_enabled = i;
/* Update primary audio codec state. */
@@ -183,7 +183,7 @@ ac97_via_update_codec(ac97_via_t *dev)
/* Update volumes according to codec registers. */
ac97_codec_getattn(codec, 0x02, &dev->master_vol_l, &dev->master_vol_r);
ac97_codec_getattn(codec, 0x18, &dev->pcm_vol_l, &dev->pcm_vol_r);
ac97_codec_getattn(codec, 0x18, &dev->sgd[0].vol_l, &dev->sgd[0].vol_r);
ac97_codec_getattn(codec, 0x12, &dev->cd_vol_l, &dev->cd_vol_r);
/* Update sample rate according to codec registers and the variable sample rate flag. */
@@ -503,10 +503,10 @@ ac97_via_remap_modem_codec(void *priv, uint16_t new_io_base, uint8_t enable)
static void
ac97_via_update(ac97_via_t *dev)
ac97_via_update_stereo(ac97_via_t *dev, ac97_via_sgd_t *sgd)
{
int32_t l = (((dev->out_l * dev->pcm_vol_l) >> 15) * dev->master_vol_l) >> 15,
r = (((dev->out_r * dev->pcm_vol_r) >> 15) * dev->master_vol_r) >> 15;
int32_t l = (((sgd->out_l * sgd->vol_l) >> 15) * dev->master_vol_l) >> 15,
r = (((sgd->out_r * sgd->vol_r) >> 15) * dev->master_vol_r) >> 15;
if (l < -32768)
l = -32768;
@@ -517,19 +517,9 @@ ac97_via_update(ac97_via_t *dev)
else if (r > 32767)
r = 32767;
for (; dev->pos < sound_pos_global; dev->pos++) {
dev->buffer[dev->pos*2] = l;
dev->buffer[dev->pos*2 + 1] = r;
}
}
static void
ac97_via_update_fm(ac97_via_t *dev)
{
for (; dev->fm_pos < sound_pos_global; dev->fm_pos++) {
dev->fm_buffer[dev->fm_pos*2] = dev->fm_out_l;
dev->fm_buffer[dev->fm_pos*2 + 1] = dev->fm_out_r;
for (; sgd->pos < sound_pos_global; sgd->pos++) {
sgd->buffer[sgd->pos*2] = l;
sgd->buffer[sgd->pos*2 + 1] = r;
}
}
@@ -546,7 +536,7 @@ ac97_via_sgd_process(void *priv)
return;
/* Schedule next run. */
timer_on_auto(&sgd->timer, 10.0);
timer_on_auto(&sgd->dma_timer, 10.0);
/* Process SGD if it's active, and the FIFO has room or is disabled. */
if ((sgd_status == 0x80) && (sgd->always_run || ((sgd->fifo_end - sgd->fifo_pos) <= (sizeof(sgd->fifo) - 4)))) {
@@ -652,38 +642,38 @@ ac97_via_sgd_process(void *priv)
static void
ac97_via_poll(void *priv)
ac97_via_poll_stereo(void *priv)
{
ac97_via_t *dev = (ac97_via_t *) priv;
ac97_via_sgd_t *sgd = &dev->sgd[0]; /* Audio Read */
/* Schedule next run if PCM playback is enabled. */
if (dev->pcm_enabled)
timer_advance_u64(&dev->timer_count, dev->timer_latch);
timer_advance_u64(&sgd->poll_timer, sgd->timer_latch);
/* Update audio buffer. */
ac97_via_update(dev);
/* Update stereo audio buffer. */
ac97_via_update_stereo(dev, sgd);
/* Feed next sample from the FIFO. */
switch (dev->sgd_regs[0x02] & 0x30) {
switch (dev->sgd_regs[sgd->id | 0x2] & 0x30) {
case 0x00: /* Mono, 8-bit PCM */
if ((sgd->fifo_end - sgd->fifo_pos) >= 1) {
dev->out_l = dev->out_r = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
sgd->out_l = sgd->out_r = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
return;
}
break;
case 0x10: /* Stereo, 8-bit PCM */
if ((sgd->fifo_end - sgd->fifo_pos) >= 2) {
dev->out_l = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
dev->out_r = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
sgd->out_l = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
sgd->out_r = (sgd->fifo[sgd->fifo_pos++ & (sizeof(sgd->fifo) - 1)] ^ 0x80) << 8;
return;
}
break;
case 0x20: /* Mono, 16-bit PCM */
if ((sgd->fifo_end - sgd->fifo_pos) >= 2) {
dev->out_l = dev->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->out_l = sgd->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->fifo_pos += 2;
return;
}
@@ -691,9 +681,9 @@ ac97_via_poll(void *priv)
case 0x30: /* Stereo, 16-bit PCM */
if ((sgd->fifo_end - sgd->fifo_pos) >= 4) {
dev->out_l = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->out_l = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->fifo_pos += 2;
dev->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->fifo_pos += 2;
return;
}
@@ -701,7 +691,7 @@ ac97_via_poll(void *priv)
}
/* Feed silence if the FIFO is empty. */
dev->out_l = dev->out_r = 0;
sgd->out_l = sgd->out_r = 0;
}
@@ -713,23 +703,23 @@ ac97_via_poll_fm(void *priv)
/* Schedule next run if FM playback is enabled. */
if (dev->fm_enabled)
timer_advance_u64(&dev->timer_count_fm, dev->timer_latch_fm);
timer_advance_u64(&sgd->poll_timer, sgd->timer_latch);
/* Update FM audio buffer. */
ac97_via_update_fm(dev);
ac97_via_update_stereo(dev, sgd);
/* Feed next sample from the FIFO.
The data format is not documented, but it probes as 16-bit stereo at 24 KHz. */
if ((sgd->fifo_end - sgd->fifo_pos) >= 4) {
dev->out_l = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->out_l = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->fifo_pos += 2;
dev->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->out_r = *((uint16_t *) &sgd->fifo[sgd->fifo_pos & (sizeof(sgd->fifo) - 1)]);
sgd->fifo_pos += 2;
return;
}
/* Feed silence if the FIFO is empty. */
dev->fm_out_l = dev->fm_out_r = 0;
sgd->out_l = sgd->out_r = 0;
}
@@ -738,15 +728,15 @@ ac97_via_get_buffer(int32_t *buffer, int len, void *priv)
{
ac97_via_t *dev = (ac97_via_t *) priv;
ac97_via_update(dev);
ac97_via_update_fm(dev);
ac97_via_update_stereo(dev, &dev->sgd[0]);
ac97_via_update_stereo(dev, &dev->sgd[2]);
for (int c = 0; c < len * 2; c++) {
buffer[c] += dev->buffer[c] / 2;
buffer[c] += dev->fm_buffer[c] / 2;
buffer[c] += dev->sgd[0].buffer[c] / 2;
buffer[c] += dev->sgd[2].buffer[c] / 2;
}
dev->pos = dev->fm_pos = 0;
dev->sgd[0].pos = dev->sgd[2].pos = 0;
}
@@ -773,8 +763,8 @@ ac97_via_speed_changed(void *priv)
else
freq = 48000.0;
dev->timer_latch = (uint64_t) ((double) TIMER_USEC * (1000000.0 / freq));
dev->timer_latch_fm = (uint64_t) ((double) TIMER_USEC * (1000000.0 / 24000.0));
dev->sgd[0].timer_latch = (uint64_t) ((double) TIMER_USEC * (1000000.0 / freq));
dev->sgd[2].timer_latch = (uint64_t) ((double) TIMER_USEC * (1000000.0 / 24000.0));
}
@@ -801,12 +791,16 @@ ac97_via_init(const device_t *info)
if ((i != 0) && (i != 2))
dev->sgd[i].always_run = 1;
timer_add(&dev->sgd[i].timer, ac97_via_sgd_process, &dev->sgd[i], 0);
/* No volume control on FM SGD that I know of. */
if (i == 2)
dev->sgd[i].vol_l = dev->sgd[i].vol_r = 32767;
timer_add(&dev->sgd[i].dma_timer, ac97_via_sgd_process, &dev->sgd[i], 0);
}
/* Set up playback pollers. */
timer_add(&dev->timer_count, ac97_via_poll, dev, 0);
timer_add(&dev->timer_count_fm, ac97_via_poll_fm, dev, 0);
timer_add(&dev->sgd[0].poll_timer, ac97_via_poll_stereo, dev, 0);
timer_add(&dev->sgd[2].poll_timer, ac97_via_poll_fm, dev, 0);
ac97_via_speed_changed(dev);
/* Set up playback handler. */