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sound, increase output level a bit

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This commit is contained in:
kub 2021-06-03 21:55:17 +02:00
parent cce32a34da
commit a5a230e0d8
2 changed files with 3 additions and 3 deletions
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2
pico/sound/mix.c
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@ -14,7 +14,7 @@
/* limitter */
#define Limit16(val) \
val -= val >> 2; /* reduce level to avoid clipping */ \
val -= val >> 3; /* reduce level to avoid clipping */ \
if ((short)val != val) val = (val < 0 ? MINOUT : MAXOUT)
int mix_32_to_16l_level;

4
pico/sound/mix_arm.S
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@ -156,7 +156,7 @@ m16_32_s2_no_unal2:
@ limit
@ reg=int_sample, r12=1, r8=tmp, kills flags
.macro Limit reg
sub \reg, \reg, \reg, asr #2 @ reduce audio lvl some to avoid clipping
sub \reg, \reg, \reg, asr #3 @ reduce audio lvl some to avoid clipping
add r8, r12, \reg, asr #15
bics r8, r8, #1 @ in non-overflow conditions r8 is 0 or 1
movne \reg, #0x8000
@ -166,7 +166,7 @@ m16_32_s2_no_unal2:
@ limit and shift up by 16
@ reg=int_sample, r12=1, r8=tmp, kills flags
.macro Limitsh reg
sub \reg, \reg, \reg, asr #2 @ reduce audio lvl some to avoid clipping
sub \reg, \reg, \reg, asr #3 @ reduce audio lvl some to avoid clipping
add r8, r12,\reg, asr #15
bics r8, r8, #1 @ in non-overflow conditions r8 is 0 or 1
moveq \reg, \reg, lsl #16