[FFmpeg-cvslog] libavutil/softfloat: exponent adjusted for aac fixed point dec
Nedeljko Babic
git at videolan.org
Thu Apr 30 14:31:15 CEST 2015
ffmpeg | branch: master | Nedeljko Babic <nedeljko.babic at imgtec.com> | Thu Apr 30 13:51:35 2015 +0200| [a1c7fe431c5077e8bcf78d696c01ef653c34db2c] | committer: Michael Niedermayer
libavutil/softfloat: exponent adjusted for aac fixed point dec
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 at imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a1c7fe431c5077e8bcf78d696c01ef653c34db2c
---
libavutil/softfloat.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libavutil/softfloat.h b/libavutil/softfloat.h
index 2e85765..5f4ac26 100644
--- a/libavutil/softfloat.h
+++ b/libavutil/softfloat.h
@@ -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);
}
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