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core, implement GG stereo

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This commit is contained in:
kub 2024-01-21 21:41:31 +01:00
parent fa4e0531d4
commit 70efc52db8
9 changed files with 112 additions and 80 deletions
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21
pico/sound/mix.c
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@ -18,7 +18,7 @@
val -= val >> 3; /* reduce level to avoid clipping */ \
if ((s16)val != val) val = (val < 0 ? MINOUT : MAXOUT)
int mix_32_to_16l_level;
int mix_32_to_16_level;
static struct iir {
int alpha; // alpha for EMA low pass
@ -63,33 +63,34 @@ static inline int filter_null(struct iir *fi2, int x)
#define filter filter_band
#define mix_32_to_16l_stereo_core(dest, src, count, lv, fl) { \
#define mix_32_to_16_stereo_core(dest, src, count, lv, fl) { \
int l, r; \
struct iir lf = lfi2, rf = rfi2; \
\
for (; count > 0; count--) \
{ \
l = r = *dest; \
l = *dest; \
l += *src++ >> lv; \
r += *src++ >> lv; \
l = fl(&lf, l); \
r = fl(&rf, r); \
Limit16(l); \
Limit16(r); \
*dest++ = l; \
r = *dest; \
r += *src++ >> lv; \
r = fl(&rf, r); \
Limit16(r); \
*dest++ = r; \
} \
lfi2 = lf, rfi2 = rf; \
}
void mix_32_to_16l_stereo_lvl(s16 *dest, s32 *src, int count)
void mix_32_to_16_stereo_lvl(s16 *dest, s32 *src, int count)
{
mix_32_to_16l_stereo_core(dest, src, count, mix_32_to_16l_level, filter);
mix_32_to_16_stereo_core(dest, src, count, mix_32_to_16_level, filter);
}
void mix_32_to_16l_stereo(s16 *dest, s32 *src, int count)
void mix_32_to_16_stereo(s16 *dest, s32 *src, int count)
{
mix_32_to_16l_stereo_core(dest, src, count, 0, filter);
mix_32_to_16_stereo_core(dest, src, count, 0, filter);
}
void mix_32_to_16_mono(s16 *dest, s32 *src, int count)