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Sensation audio: Properly zero the DAC audio output when the DMA buffer is empty

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win2kgamer
2026-01-26 21:56:01 -06:00
parent 3ce332794e
commit d8b57ac875
1 changed files with 16 additions and 1 deletions
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17
src/sound/snd_sensation.c
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@@ -141,6 +141,7 @@ typedef struct sensation_t {
uint8_t visdac_playback_pos : 2;
uint8_t visdac_playback_pos_test;
int visdac_irq_status;
uint8_t visdac_dma_nodata;
int16_t visdac_out_l;
int16_t visdac_out_r;
@@ -177,8 +178,10 @@ sensation_visdac_dmaread(sensation_t *dev, int channel)
if (dev->visdac_dma_data == DMA_NODATA) {
sensation_log(dev->log, "VISDAC DMA: no data!\n");
dev->visdac_dma_nodata = 1;
return DMA_NODATA;
}
} else
dev->visdac_dma_nodata = 0;
ret = dev->visdac_dma_data & 0xff;
}
@@ -246,18 +249,27 @@ sensation_visdac_poll(void *priv)
switch (format) {
case 0x80: /* 8-bit Mono PCM */
dev->visdac_out_l = dev->visdac_out_r = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) ^ 0x80) << 8);
if (dev->visdac_dma_nodata) {
dev->visdac_out_l = dev->visdac_out_r = 0;
}
dev->visdac_playback_pos++;
dev->visdac_playback_pos_test++;
break;
case 0x00: /* 8-bit Stereo PCM */
dev->visdac_out_l = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) ^ 0x80) << 8);
dev->visdac_out_r = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) ^ 0x80) << 8);
if (dev->visdac_dma_nodata) {
dev->visdac_out_l = dev->visdac_out_r = 0;
}
dev->visdac_playback_pos += 2;
dev->visdac_playback_pos_test += 2;
break;
case 0x88: /* 16-bit Mono PCM */
temp = (int32_t) sensation_visdac_dmaread(dev, dev->visdac_dma);
dev->visdac_out_l = dev->visdac_out_r = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) << 8) | temp);
if (dev->visdac_dma_nodata) {
dev->visdac_out_l = dev->visdac_out_r = 0;
}
dev->visdac_playback_pos += 2;
dev->visdac_playback_pos_test += 2;
break;
@@ -266,6 +278,9 @@ sensation_visdac_poll(void *priv)
dev->visdac_out_l = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) << 8) | temp);
temp = (int32_t) sensation_visdac_dmaread(dev, dev->visdac_dma);
dev->visdac_out_r = (int16_t) ((sensation_visdac_dmaread(dev, dev->visdac_dma) << 8) | temp);
if (dev->visdac_dma_nodata) {
dev->visdac_out_l = dev->visdac_out_r = 0;
}
dev->visdac_playback_pos += 4;
dev->visdac_playback_pos_test += 4;
break;