[FFmpeg-devel] [PATCH] avcodec/jpeg2000: use powf instead of pow

[Ganesh Ajjanagadde]

It may be entirely possible to optimize further by exploiting the fact
that it is always an integer exponent. However, care must be taken since
the base itself is not an integer, i.e a naive repeated squaring or
similar such algorithm may be inaccurate.

Range information can only be obtained by knowledge of the spec, so the
low hanging pow->powf is done.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
---
 libavcodec/jpeg2000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/jpeg2000.c b/libavcodec/jpeg2000.c
index afd0966..d90c605 100644
--- a/libavcodec/jpeg2000.c
+++ b/libavcodec/jpeg2000.c
@@ -257,7 +257,7 @@ static void init_band_stepsize(AVCodecContext *avctx,
                 break;
         }
         if (codsty->transform == FF_DWT97) {
-            band->f_stepsize *= pow(F_LFTG_K, 2*(codsty->nreslevels2decode - reslevelno) + lband - 2);
+            band->f_stepsize *= powf(F_LFTG_K, 2*(codsty->nreslevels2decode - reslevelno) + lband - 2);
         }
     }
 
-- 
2.6.3