[FFmpeg-cvslog] ac3enc: simplify sym_quant()

[Mans Rullgard]

ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Thu Mar 31 01:28:08 2011 +0100| [7f6e05cdfd1242a6774e89283b6e2cefde191590] | committer: Mans Rullgard

ac3enc: simplify sym_quant()

These expressions are equivalent since levels is always odd, and
overflow is impossible due to the constraints set by the assert().

Signed-off-by: Mans Rullgard <mans at mansr.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7f6e05cdfd1242a6774e89283b6e2cefde191590
---

 libavcodec/ac3enc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 18e4dae..a869d7d 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1192,7 +1192,7 @@ static int compute_bit_allocation(AC3EncodeContext *s)
  */
 static inline int sym_quant(int c, int e, int levels)
 {
-    int v = ((((levels * c) >> (24 - e)) + 1) >> 1) + (levels >> 1);
+    int v = (((levels * c) >> (24 - e)) + levels) >> 1;
     av_assert2(v >= 0 && v < levels);
     return v;
 }