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This commit is contained in:
Ken Cooke 2016-03-04 17:11:44 -08:00
parent 06bde077b2
commit d390c60ef7
1 changed files with 10 additions and 5 deletions
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15
libraries/audio/src/AudioLimiter.cpp
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@ -132,6 +132,7 @@ static const int32_t exp2Table[1 << EXP2_TABBITS][3] = {
{ 0x785c4499, 0x390ecc3a, 0x456188bd },
};
static const int IEEE754_FABS_MASK = 0x7fffffff;
static const int IEEE754_MANT_BITS = 23;
static const int IEEE754_EXPN_BIAS = 127;
@ -146,14 +147,16 @@ static inline int32_t peaklog2(float* input) {
int32_t u = *(int32_t*)input;
// absolute value
int32_t peak = u & 0x7fffffff;
int32_t peak = u & IEEE754_FABS_MASK;
// split into e and x - 1.0
int32_t e = IEEE754_EXPN_BIAS - (peak >> IEEE754_MANT_BITS) + LOG2_HEADROOM;
int32_t x = (peak << (31 - IEEE754_MANT_BITS)) & 0x7fffffff;
// saturate
if (e > 31) return 0x7fffffff;
if (e > 31) {
return 0x7fffffff;
}
int k = x >> (31 - LOG2_TABBITS);
@ -181,8 +184,8 @@ static inline int32_t peaklog2(float* input0, float* input1) {
int32_t u1 = *(int32_t*)input1;
// max absolute value
u0 &= 0x7fffffff;
u1 &= 0x7fffffff;
u0 &= IEEE754_FABS_MASK;
u1 &= IEEE754_FABS_MASK;
int32_t peak = MAX(u0, u1);
// split into e and x - 1.0
@ -190,7 +193,9 @@ static inline int32_t peaklog2(float* input0, float* input1) {
int32_t x = (peak << (31 - IEEE754_MANT_BITS)) & 0x7fffffff;
// saturate
if (e > 31) return 0x7fffffff;
if (e > 31) {
return 0x7fffffff;
}
int k = x >> (31 - LOG2_TABBITS);