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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2011-06-21 16:14:19 -0400 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2011-06-22 12:18:10 -0400 |
| commit | f21fb76b1be18036c93c3e29fe1889a9fabf30b3 (patch) | |
| tree | b04f6b0479e8ce3467f07d57bb5b75ecefa7bc9d | |
| parent | 0e4dbe2996cad6d5e0b1c1d702306f3bd8499df9 (diff) | |
| download | ffmpeg-f21fb76b1be18036c93c3e29fe1889a9fabf30b3.tar.gz | |
ac3enc: remove a branch in asym_quant() by doing 2 shifts
| -rw-r--r-- | libavcodec/ac3enc.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index 1db69414a5..db45c8360e 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -1123,15 +1123,9 @@ static inline int sym_quant(int c, int e, int levels) */ static inline int asym_quant(int c, int e, int qbits) { - int lshift, m, v; + int m, v; - lshift = e + qbits - 24; - if (lshift >= 0) - v = c << lshift; - else - v = c >> (-lshift); - /* rounding */ - v = (v + 1) >> 1; + v = (((c << e) >> (24 - qbits)) + 1) >> 1; m = (1 << (qbits-1)); if (v >= m) v = m - 1; |