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fixed symetric quantization (better quality!)

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Originally committed as revision 130 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-09-16 21:52:58 +00:00
parent 73120e555c
commit 8d67072fea
1 changed files with 4 additions and 2 deletions
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6
libavcodec/ac3enc.c
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@ -842,10 +842,12 @@ static inline int sym_quant(int c, int e, int levels)
int v; int v;
if (c >= 0) { if (c >= 0) {
v = (levels * (c << e)) >> 25; v = (levels * (c << e)) >> 24;
v = (v + 1) >> 1;
v = (levels >> 1) + v; v = (levels >> 1) + v;
} else { } else {
v = (levels * ((-c) << e)) >> 25; v = (levels * ((-c) << e)) >> 24;
v = (v + 1) >> 1;
v = (levels >> 1) - v; v = (levels >> 1) - v;
} }
assert (v >= 0 && v < levels); assert (v >= 0 && v < levels);