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libavutil/softfloat: exponent adjusted for aac fixed point dec

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Exponent usage and calculation in softfloat adjusted to the format used in
implementation of fixed point aac decoder.

Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Nedeljko Babic 2015-04-30 13:51:35 +02:00 committed by Michael Niedermayer
parent d2184bf3b6
commit a1c7fe431c
1 changed files with 4 additions and 4 deletions
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8
libavutil/softfloat.h
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@ -83,7 +83,7 @@ static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
a.exp += b.exp;
av_assert2((int32_t)((a.mant * (int64_t)b.mant) >> ONE_BITS) == (a.mant * (int64_t)b.mant) >> ONE_BITS);
a.mant = (a.mant * (int64_t)b.mant) >> ONE_BITS;
return av_normalize1_sf(a);
return av_normalize1_sf((SoftFloat){a.mant, a.exp - 1});
}
/**
@ -91,7 +91,7 @@ static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
* @return Will not be more denormalized than a.
*/
static av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
a.exp -= b.exp+1;
a.exp -= b.exp;
a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant;
return av_normalize1_sf(a);
}
@ -121,14 +121,14 @@ static inline av_const SoftFloat av_sub_sf(SoftFloat a, SoftFloat b){
* @returns a SoftFloat with value v * 2^frac_bits
*/
static inline av_const SoftFloat av_int2sf(int v, int frac_bits){
return av_normalize_sf((SoftFloat){v, ONE_BITS-frac_bits});
return av_normalize_sf((SoftFloat){v, ONE_BITS + 1 - frac_bits});
}
/**
* Rounding is to -inf.
*/
static inline av_const int av_sf2int(SoftFloat v, int frac_bits){
v.exp += frac_bits - ONE_BITS;
v.exp += frac_bits - (ONE_BITS + 1);
if(v.exp >= 0) return v.mant << v.exp ;
else return v.mant >>(-v.exp);
}