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Change-Id: I5d5acdde6ea98b986d8e0c9247df20a41c56950b
This commit is contained in:
Alex Converse 2015-09-14 11:40:34 -07:00
parent f2b5185d76
commit 365e37193c
1 changed files with 20 additions and 0 deletions
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20
vp10/common/ans.h
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@ -75,17 +75,37 @@ static inline void rabs_write(struct AnsCoder *ans, int val, AnsP8 p0) {
ans->state = quot * ans_p8_precision + rem + (val ? 0 : p);
}
#define ANS_IMPL1 0
#define UNPREDICTABLE(x) x
static inline int rabs_read(struct AnsDecoder *ans, AnsP8 p0) {
int val;
#if ANS_IMPL1
unsigned l_s;
#else
unsigned quot, rem, x, xn;
#endif
const AnsP8 p = ans_p8_precision - p0;
if (ans->state < l_base) {
ans->state = ans->state * io_base + ans->buf[--ans->buf_offset];
}
#if ANS_IMPL1
val = ans->state % ans_p8_precision < p;
l_s = val ? p : p0;
ans->state = (ans->state / ans_p8_precision) * l_s +
ans->state % ans_p8_precision - (!val * p);
#else
x = ans->state;
quot = x / ans_p8_precision;
rem = x % ans_p8_precision;
xn = quot * p;
val = rem < p;
if (UNPREDICTABLE(val)) {
ans->state = xn + rem;
} else {
//ans->state = quot * p0 + rem - p;
ans->state = x - xn - p;
}
#endif
return val;
}