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Fixes to math for level calculations

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gamblor21 2021-04-02 16:47:25 -05:00
parent 0b212e2243
commit 9bf4b4d81e
1 changed files with 4 additions and 3 deletions
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7
shared-module/audiomixer/Mixer.c
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@ -110,7 +110,7 @@ static inline uint32_t add16signed(uint32_t a, uint32_t b) {
for (int8_t i = 0; i < 2; i++) {
int16_t ai = a >> (sizeof(int16_t) * 8 * i);
int16_t bi = b >> (sizeof(int16_t) * 8 * i);
int32_t intermediate = (int32_t)ai + bi / 2;
int32_t intermediate = (int32_t)ai + bi;
if (intermediate > SHRT_MAX) {
intermediate = SHRT_MAX;
} else if (intermediate < SHRT_MIN) {
@ -139,14 +139,15 @@ static inline uint32_t mult16signed(uint32_t val, int32_t mul) {
uint32_t result = 0;
float mod_mul = (float)mul / (float)((1 << 15) - 1);
for (int8_t i = 0; i < 2; i++) {
int16_t ai = (val >> (sizeof(uint16_t) * 8 * i)) - 0x8000;
int16_t ai = (val >> (sizeof(uint16_t) * 8 * i));
int32_t intermediate = ai * mod_mul;
if (intermediate > SHRT_MAX) {
intermediate = SHRT_MAX;
} else if (intermediate < SHRT_MIN) {
intermediate = SHRT_MIN;
}
result |= (((uint32_t)intermediate) + 0x8000) << (sizeof(int16_t) * 8 * i);
intermediate &= 0x0000FFFF;
result |= (((uint32_t)intermediate)) << (sizeof(int16_t) * 8 * i);
}
return result;
#endif