[FFmpeg-cvslog] avcodec/dcadec: use a constant instead of assuming every compiler can optimize pow(2, -15)

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri May 23 22:15:57 2014 +0200| [9ccb5455ca8c63eb330abd3c2ed6a9b0ae3b755e] | committer: Michael Niedermayer

avcodec/dcadec: use a constant instead of assuming every compiler can optimize pow(2,-15)

Idea-by: nevcairiel and wm4
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9ccb5455ca8c63eb330abd3c2ed6a9b0ae3b755e
---

 libavcodec/dcadec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/dcadec.c b/libavcodec/dcadec.c
index 684294e..c072044 100644
--- a/libavcodec/dcadec.c
+++ b/libavcodec/dcadec.c
@@ -2107,7 +2107,7 @@ static float dca_dmix_code(unsigned code)
 {
     int sign = (code >> 8) - 1;
     code &= 0xff;
-    return ((dca_dmixtable[code] ^ sign) - sign) * pow(2, -15);
+    return ((dca_dmixtable[code] ^ sign) - sign) * 0x1p-15;
 }
 
 /**