80486DX2-66/86Box-fork
1
0
Fork 0
Code Issues Pull Requests Activity

ESS register 0xA2 update function

Browse Source
This commit is contained in:
Cacodemon345
2024-03-02 17:36:55 +06:00
committed by Kagamiin~
parent 3f72c788bd
commit 4369284f65
1 changed files with 15 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/sound/snd_sb_dsp.c
View File

@@ -585,6 +585,18 @@ sb_dsp_setdma16_translate(sb_dsp_t *dsp, int translate)
dsp->sb_16_dma_translate = translate; dsp->sb_16_dma_translate = translate;
} }
/* TODO: Investigate ESS cards' filtering on real hardware as well.
(DOSBox-X did it purely off some laptop's ESS chip, which isn't a good look.) */
static void sb_ess_update_filter_freq(sb_dsp_t *dsp) {
if (dsp->sb_freq >= 22050)
ESSreg(0xA1) = 256 - (795500UL / dsp->sb_freq);
else
ESSreg(0xA1) = 128 - (397700UL / dsp->sb_freq);
unsigned int freq = ((dsp->sb_freq * 4) / (5 * 2)); /* 80% of 1/2 the sample rate */
ESSreg(0xA2) = 256 - (7160000 / (freq * 82));
}
void void
sb_exec_command(sb_dsp_t *dsp) sb_exec_command(sb_dsp_t *dsp)
{ {
@@ -796,6 +808,9 @@ sb_exec_command(sb_dsp_t *dsp)
if ((dsp->sb_freq != temp) && (dsp->sb_type >= SB16)) if ((dsp->sb_freq != temp) && (dsp->sb_type >= SB16))
recalc_sb16_filter(0, temp); recalc_sb16_filter(0, temp);
dsp->sb_freq = temp; dsp->sb_freq = temp;
if (IS_ESS(dsp)) {
sb_ess_update_filter_freq(dsp);
}
break; break;
case 0x41: /* Set output sampling rate */ case 0x41: /* Set output sampling rate */
case 0x42: /* Set input sampling rate */ case 0x42: /* Set input sampling rate */