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The start of AC97 volume control

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This commit is contained in:
RichardG867
2021-07-26 00:19:39 -03:00
parent 42eada3122
commit 70285df61b
4 changed files with 74 additions and 44 deletions
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34
src/sound/snd_ac97_codec.c
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@@ -54,6 +54,11 @@ ac97_codec_log(const char *fmt, ...)
#define ac97_codec_log(fmt, ...)
#endif
static const int32_t codec_attn[] = {
25, 32, 41, 51, 65, 82, 103, 130, 164, 206, 260, 327, 412, 519, 653, 822,
1036, 1304, 1641, 2067, 2602, 3276, 4125, 5192, 6537, 8230, 10362, 13044, 16422, 20674, 26027, 32767
};
ac97_codec_t **ac97_codec = NULL, **ac97_modem_codec = NULL;
int ac97_codec_count = 0, ac97_modem_codec_count = 0;
@@ -182,6 +187,35 @@ ac97_codec_reset(void *priv)
}
void
ac97_codec_getattn(void *priv, uint8_t reg, int *l, int *r)
{
ac97_codec_t *dev = (ac97_codec_t *) priv;
uint8_t r_val = dev->regs[reg],
l_val = dev->regs[reg | 1];
if (l_val & 0x80) { /* mute */
*l = 0;
*r = 0;
return;
}
if (reg < 0x10) { /* 6-bit volume */
if (l_val & 0x20)
*l = codec_attn[0];
else
*l = codec_attn[0x1f - (l_val & 0x1f)];
if (r_val & 0x20)
*r = codec_attn[0];
else
*r = codec_attn[0x1f - (r_val & 0x1f)];
} else { /* 5-bit gain */
*l = codec_attn[0x1f - (l_val & 0x1f)];
*r = codec_attn[0x1f - (r_val & 0x1f)];
}
}
static void *
ac97_codec_init(const device_t *info)
{