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This commit is contained in:
Chris
2023-08-12 09:49:26 +02:00
parent 537fba98c4
commit 044f42374b
22 changed files with 3090 additions and 3216 deletions
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77
companding/mulaw.h
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@@ -5,43 +5,44 @@ namespace trnr {
// mulaw companding based on code by Emilie Gillet / Mutable Instruments
class mulaw {
public:
int8_t encode_samples(int16_t pcm_val) {
int16_t mask;
int16_t seg;
uint8_t uval;
pcm_val = pcm_val >> 2;
if (pcm_val < 0) {
pcm_val = -pcm_val;
mask = 0x7f;
} else {
mask = 0xff;
}
if (pcm_val > 8159) pcm_val = 8159;
pcm_val += (0x84 >> 2);
if (pcm_val <= 0x3f) seg = 0;
else if (pcm_val <= 0x7f) seg = 1;
else if (pcm_val <= 0xff) seg = 2;
else if (pcm_val <= 0x1ff) seg = 3;
else if (pcm_val <= 0x3ff) seg = 4;
else if (pcm_val <= 0x7ff) seg = 5;
else if (pcm_val <= 0xfff) seg = 6;
else if (pcm_val <= 0x1fff) seg = 7;
else seg = 8;
if (seg >= 8)
return static_cast<uint8_t>(0x7f ^ mask);
else {
uval = static_cast<uint8_t>((seg << 4) | ((pcm_val >> (seg + 1)) & 0x0f));
return (uval ^ mask);
}
}
int8_t encode_samples(int16_t pcm_val)
{
int16_t mask;
int16_t seg;
uint8_t uval;
pcm_val = pcm_val >> 2;
if (pcm_val < 0) {
pcm_val = -pcm_val;
mask = 0x7f;
} else {
mask = 0xff;
}
if (pcm_val > 8159) pcm_val = 8159;
pcm_val += (0x84 >> 2);
int16_t decode_samples(uint8_t u_val) {
int16_t t;
u_val = ~u_val;
t = ((u_val & 0xf) << 3) + 0x84;
t <<= ((unsigned)u_val & 0x70) >> 4;
return ((u_val & 0x80) ? (0x84 - t) : (t - 0x84));
}
if (pcm_val <= 0x3f) seg = 0;
else if (pcm_val <= 0x7f) seg = 1;
else if (pcm_val <= 0xff) seg = 2;
else if (pcm_val <= 0x1ff) seg = 3;
else if (pcm_val <= 0x3ff) seg = 4;
else if (pcm_val <= 0x7ff) seg = 5;
else if (pcm_val <= 0xfff) seg = 6;
else if (pcm_val <= 0x1fff) seg = 7;
else seg = 8;
if (seg >= 8) return static_cast<uint8_t>(0x7f ^ mask);
else {
uval = static_cast<uint8_t>((seg << 4) | ((pcm_val >> (seg + 1)) & 0x0f));
return (uval ^ mask);
}
}
int16_t decode_samples(uint8_t u_val)
{
int16_t t;
u_val = ~u_val;
t = ((u_val & 0xf) << 3) + 0x84;
t <<= ((unsigned)u_val & 0x70) >> 4;
return ((u_val & 0x80) ? (0x84 - t) : (t - 0x84));
}
};
}
} // namespace trnr