fixed symetric quantization (better quality!)

Originally committed as revision 130 to svn://svn.ffmpeg.org/ffmpeg/trunk

fixed symetric quantization (better quality!)
Originally committed as revision 130 to svn://svn.ffmpeg.org/ffmpeg/trunk
8d67072f · Fabrice Bellard · 73120e55 · 8d67072f
Commit 8d67072f authored Sep 16, 2001 by Fabrice Bellard
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Showing with 4 additions and 2 deletions

ac3enc.c libavcodec/ac3enc.c +4 -2

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--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -842,10 +842,12 @@ static inline int sym_quant(int c, int e, int levels)
    int v;
    if (c >= 0) {
-        v = (levels * (c << e)) >> 25;
+        v = (levels * (c << e)) >> 24;
+        v = (v + 1) >> 1;
        v = (levels >> 1) + v;
    } else {
-        v = (levels * ((-c) << e)) >> 25;
+        v = (levels * ((-c) << e)) >> 24;
+        v = (v + 1) >> 1;
        v = (levels >> 1) - v;
    }
    assert (v >= 0 && v < levels);