[FFmpeg-cvslog] ac3dec: use get_sbits() instead of manually sign-extending

Mans Rullgard git at videolan.org
Mon Oct 10 03:59:52 CEST 2011


ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Sun Oct  9 23:15:17 2011 +0100| [633ddb85192f1cc39d61fae98455eb6ae5638df0] | committer: Mans Rullgard

ac3dec: use get_sbits() instead of manually sign-extending

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=633ddb85192f1cc39d61fae98455eb6ae5638df0
---

 libavcodec/ac3dec.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 5046a5c..956a7ac 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -505,9 +505,9 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, ma
                 mantissa = b5_mantissas[get_bits(gbc, 4)];
                 break;
             default: /* 6 to 15 */
-                mantissa = get_bits(gbc, quantization_tab[bap]);
                 /* Shift mantissa and sign-extend it. */
-                mantissa = (mantissa << (32-quantization_tab[bap]))>>8;
+                mantissa = get_sbits(gbc, quantization_tab[bap]);
+                mantissa <<= 24 - quantization_tab[bap];
                 break;
         }
         coeffs[freq] = mantissa >> exps[freq];



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